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   1 /*
   2  * amd5536.c -- AMD 5536 UDC high/full speed USB device controller
   3  *
   4  * Copyright (C) 2005-2007 AMD (http://www.amd.com)
   5  * Author: Thomas Dahlmann
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 /*
  23  * The AMD5536 UDC is part of the x86 southbridge AMD Geode CS5536.
  24  * It is a USB Highspeed DMA capable USB device controller. Beside ep0 it
  25  * provides 4 IN and 4 OUT endpoints (bulk or interrupt type).
  26  *
  27  * Make sure that UDC is assigned to port 4 by BIOS settings (port can also
  28  * be used as host port) and UOC bits PAD_EN and APU are set (should be done
  29  * by BIOS init).
  30  *
  31  * UDC DMA requires 32-bit aligned buffers so DMA with gadget ether does not
  32  * work without updating NET_IP_ALIGN. Or PIO mode (module param "use_dma=0")
  33  * can be used with gadget ether.
  34  */
  35
  36 /* debug control */
  37 /* #define UDC_VERBOSE */
  38
  39 /* Driver strings */
  40 #define UDC_MOD_DESCRIPTION             "AMD 5536 UDC - USB Device Controller"
  41 #define UDC_DRIVER_VERSION_STRING       "01.00.0206 - $Revision: #3 $"
  42
  43 /* system */
  44 #include <linux/module.h>
  45 #include <linux/pci.h>
  46 #include <linux/kernel.h>
  47 #include <linux/delay.h>
  48 #include <linux/ioport.h>
  49 #include <linux/sched.h>
  50 #include <linux/slab.h>
  51 #include <linux/smp_lock.h>
  52 #include <linux/errno.h>
  53 #include <linux/init.h>
  54 #include <linux/timer.h>
  55 #include <linux/list.h>
  56 #include <linux/interrupt.h>
  57 #include <linux/ioctl.h>
  58 #include <linux/fs.h>
  59 #include <linux/dmapool.h>
  60 #include <linux/moduleparam.h>
  61 #include <linux/device.h>
  62 #include <linux/io.h>
  63 #include <linux/irq.h>
  64
  65 #include <asm/byteorder.h>
  66 #include <asm/system.h>
  67 #include <asm/unaligned.h>
  68
  69 /* gadget stack */
  70 #include <linux/usb/ch9.h>
  71 #include <linux/usb/gadget.h>
  72
  73 /* udc specific */
  74 #include "amd5536udc.h"
  75
  76
  77 static void udc_tasklet_disconnect(unsigned long);
  78 static void empty_req_queue(struct udc_ep *);
  79 static int udc_probe(struct udc *dev);
  80 static void udc_basic_init(struct udc *dev);
  81 static void udc_setup_endpoints(struct udc *dev);
  82 static void udc_soft_reset(struct udc *dev);
  83 static struct udc_request *udc_alloc_bna_dummy(struct udc_ep *ep);
  84 static void udc_free_request(struct usb_ep *usbep, struct usb_request *usbreq);
  85 static int udc_free_dma_chain(struct udc *dev, struct udc_request *req);
  86 static int udc_create_dma_chain(struct udc_ep *ep, struct udc_request *req,
  87                                 unsigned long buf_len, gfp_t gfp_flags);
  88 static int udc_remote_wakeup(struct udc *dev);
  89 static int udc_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id);
  90 static void udc_pci_remove(struct pci_dev *pdev);
  91
  92 /* description */
  93 static const char mod_desc[] = UDC_MOD_DESCRIPTION;
  94 static const char name[] = "amd5536udc";
  95
  96 /* structure to hold endpoint function pointers */
  97 static const struct usb_ep_ops udc_ep_ops;
  98
  99 /* received setup data */
 100 static union udc_setup_data setup_data;
 101
 102 /* pointer to device object */
 103 static struct udc *udc;
 104
 105 /* irq spin lock for soft reset */
 106 static DEFINE_SPINLOCK(udc_irq_spinlock);
 107 /* stall spin lock */
 108 static DEFINE_SPINLOCK(udc_stall_spinlock);
 109
 110 /*
 111 * slave mode: pending bytes in rx fifo after nyet,
 112 * used if EPIN irq came but no req was available
 113 */
 114 static unsigned int udc_rxfifo_pending;
 115
 116 /* count soft resets after suspend to avoid loop */
 117 static int soft_reset_occured;
 118 static int soft_reset_after_usbreset_occured;
 119
 120 /* timer */
 121 static struct timer_list udc_timer;
 122 static int stop_timer;
 123
 124 /* set_rde -- Is used to control enabling of RX DMA. Problem is
 125  * that UDC has only one bit (RDE) to enable/disable RX DMA for
 126  * all OUT endpoints. So we have to handle race conditions like
 127  * when OUT data reaches the fifo but no request was queued yet.
 128  * This cannot be solved by letting the RX DMA disabled until a
 129  * request gets queued because there may be other OUT packets
 130  * in the FIFO (important for not blocking control traffic).
 131  * The value of set_rde controls the correspondig timer.
 132  *
 133  * set_rde -1 == not used, means it is alloed to be set to 0 or 1
 134  * set_rde  0 == do not touch RDE, do no start the RDE timer
 135  * set_rde  1 == timer function will look whether FIFO has data
 136  * set_rde  2 == set by timer function to enable RX DMA on next call
 137  */
 138 static int set_rde = -1;
 139
 140 static DECLARE_COMPLETION(on_exit);
 141 static struct timer_list udc_pollstall_timer;
 142 static int stop_pollstall_timer;
 143 static DECLARE_COMPLETION(on_pollstall_exit);
 144
 145 /* tasklet for usb disconnect */
 146 static DECLARE_TASKLET(disconnect_tasklet, udc_tasklet_disconnect,
 147                 (unsigned long) &udc);
 148
 149
 150 /* endpoint names used for print */
 151 static const char ep0_string[] = "ep0in";
 152 static const char *ep_string[] = {
 153         ep0_string,
 154         "ep1in-int", "ep2in-bulk", "ep3in-bulk", "ep4in-bulk", "ep5in-bulk",
 155         "ep6in-bulk", "ep7in-bulk", "ep8in-bulk", "ep9in-bulk", "ep10in-bulk",
 156         "ep11in-bulk", "ep12in-bulk", "ep13in-bulk", "ep14in-bulk",
 157         "ep15in-bulk", "ep0out", "ep1out-bulk", "ep2out-bulk", "ep3out-bulk",
 158         "ep4out-bulk", "ep5out-bulk", "ep6out-bulk", "ep7out-bulk",
 159         "ep8out-bulk", "ep9out-bulk", "ep10out-bulk", "ep11out-bulk",
 160         "ep12out-bulk", "ep13out-bulk", "ep14out-bulk", "ep15out-bulk"
 161 };
 162
 163 /* DMA usage flag */
 164 static int use_dma = 1;
 165 /* packet per buffer dma */
 166 static int use_dma_ppb = 1;
 167 /* with per descr. update */
 168 static int use_dma_ppb_du;
 169 /* buffer fill mode */
 170 static int use_dma_bufferfill_mode;
 171 /* full speed only mode */
 172 static int use_fullspeed;
 173 /* tx buffer size for high speed */
 174 static unsigned long hs_tx_buf = UDC_EPIN_BUFF_SIZE;
 175
 176 /* module parameters */
 177 module_param(use_dma, bool, S_IRUGO);
 178 MODULE_PARM_DESC(use_dma, "true for DMA");
 179 module_param(use_dma_ppb, bool, S_IRUGO);
 180 MODULE_PARM_DESC(use_dma_ppb, "true for DMA in packet per buffer mode");
 181 module_param(use_dma_ppb_du, bool, S_IRUGO);
 182 MODULE_PARM_DESC(use_dma_ppb_du,
 183         "true for DMA in packet per buffer mode with descriptor update");
 184 module_param(use_fullspeed, bool, S_IRUGO);
 185 MODULE_PARM_DESC(use_fullspeed, "true for fullspeed only");
 186
 187 /*---------------------------------------------------------------------------*/
 188 /* Prints UDC device registers and endpoint irq registers */
 189 static void print_regs(struct udc *dev)
 190 {
 191         DBG(dev, "------- Device registers -------\n");
 192         DBG(dev, "dev config     = %08x\n", readl(&dev->regs->cfg));
 193         DBG(dev, "dev control    = %08x\n", readl(&dev->regs->ctl));
 194         DBG(dev, "dev status     = %08x\n", readl(&dev->regs->sts));
 195         DBG(dev, "\n");
 196         DBG(dev, "dev int's      = %08x\n", readl(&dev->regs->irqsts));
 197         DBG(dev, "dev intmask    = %08x\n", readl(&dev->regs->irqmsk));
 198         DBG(dev, "\n");
 199         DBG(dev, "dev ep int's   = %08x\n", readl(&dev->regs->ep_irqsts));
 200         DBG(dev, "dev ep intmask = %08x\n", readl(&dev->regs->ep_irqmsk));
 201         DBG(dev, "\n");
 202         DBG(dev, "USE DMA        = %d\n", use_dma);
 203         if (use_dma && use_dma_ppb && !use_dma_ppb_du) {
 204                 DBG(dev, "DMA mode       = PPBNDU (packet per buffer "
 205                         "WITHOUT desc. update)\n");
 206                 dev_info(&dev->pdev->dev, "DMA mode (%s)\n", "PPBNDU");
 207         } else if (use_dma && use_dma_ppb_du && use_dma_ppb_du) {
 208                 DBG(dev, "DMA mode       = PPBDU (packet per buffer "
 209                         "WITH desc. update)\n");
 210                 dev_info(&dev->pdev->dev, "DMA mode (%s)\n", "PPBDU");
 211         }
 212         if (use_dma && use_dma_bufferfill_mode) {
 213                 DBG(dev, "DMA mode       = BF (buffer fill mode)\n");
 214                 dev_info(&dev->pdev->dev, "DMA mode (%s)\n", "BF");
 215         }
 216         if (!use_dma) {
 217                 dev_info(&dev->pdev->dev, "FIFO mode\n");
 218         }
 219         DBG(dev, "-------------------------------------------------------\n");
 220 }
 221
 222 /* Masks unused interrupts */
 223 static int udc_mask_unused_interrupts(struct udc *dev)
 224 {
 225         u32 tmp;
 226
 227         /* mask all dev interrupts */
 228         tmp =   AMD_BIT(UDC_DEVINT_SVC) |
 229                 AMD_BIT(UDC_DEVINT_ENUM) |
 230                 AMD_BIT(UDC_DEVINT_US) |
 231                 AMD_BIT(UDC_DEVINT_UR) |
 232                 AMD_BIT(UDC_DEVINT_ES) |
 233                 AMD_BIT(UDC_DEVINT_SI) |
 234                 AMD_BIT(UDC_DEVINT_SOF)|
 235                 AMD_BIT(UDC_DEVINT_SC);
 236         writel(tmp, &dev->regs->irqmsk);
 237
 238         /* mask all ep interrupts */
 239         writel(UDC_EPINT_MSK_DISABLE_ALL, &dev->regs->ep_irqmsk);
 240
 241         return 0;
 242 }
 243
 244 /* Enables endpoint 0 interrupts */
 245 static int udc_enable_ep0_interrupts(struct udc *dev)
 246 {
 247         u32 tmp;
 248
 249         DBG(dev, "udc_enable_ep0_interrupts()\n");
 250
 251         /* read irq mask */
 252         tmp = readl(&dev->regs->ep_irqmsk);
 253         /* enable ep0 irq's */
 254         tmp &= AMD_UNMASK_BIT(UDC_EPINT_IN_EP0)
 255                 & AMD_UNMASK_BIT(UDC_EPINT_OUT_EP0);
 256         writel(tmp, &dev->regs->ep_irqmsk);
 257
 258         return 0;
 259 }
 260
 261 /* Enables device interrupts for SET_INTF and SET_CONFIG */
 262 static int udc_enable_dev_setup_interrupts(struct udc *dev)
 263 {
 264         u32 tmp;
 265
 266         DBG(dev, "enable device interrupts for setup data\n");
 267
 268         /* read irq mask */
 269         tmp = readl(&dev->regs->irqmsk);
 270
 271         /* enable SET_INTERFACE, SET_CONFIG and other needed irq's */
 272         tmp &= AMD_UNMASK_BIT(UDC_DEVINT_SI)
 273                 & AMD_UNMASK_BIT(UDC_DEVINT_SC)
 274                 & AMD_UNMASK_BIT(UDC_DEVINT_UR)
 275                 & AMD_UNMASK_BIT(UDC_DEVINT_SVC)
 276                 & AMD_UNMASK_BIT(UDC_DEVINT_ENUM);
 277         writel(tmp, &dev->regs->irqmsk);
 278
 279         return 0;
 280 }
 281
 282 /* Calculates fifo start of endpoint based on preceeding endpoints */
 283 static int udc_set_txfifo_addr(struct udc_ep *ep)
 284 {
 285         struct udc      *dev;
 286         u32 tmp;
 287         int i;
 288
 289         if (!ep || !(ep->in))
 290                 return -EINVAL;
 291
 292         dev = ep->dev;
 293         ep->txfifo = dev->txfifo;
 294
 295         /* traverse ep's */
 296         for (i = 0; i < ep->num; i++) {
 297                 if (dev->ep[i].regs) {
 298                         /* read fifo size */
 299                         tmp = readl(&dev->ep[i].regs->bufin_framenum);
 300                         tmp = AMD_GETBITS(tmp, UDC_EPIN_BUFF_SIZE);
 301                         ep->txfifo += tmp;
 302                 }
 303         }
 304         return 0;
 305 }
 306
 307 /* CNAK pending field: bit0 = ep0in, bit16 = ep0out */
 308 static u32 cnak_pending;
 309
 310 static void UDC_QUEUE_CNAK(struct udc_ep *ep, unsigned num)
 311 {
 312         if (readl(&ep->regs->ctl) & AMD_BIT(UDC_EPCTL_NAK)) {
 313                 DBG(ep->dev, "NAK could not be cleared for ep%d\n", num);
 314                 cnak_pending |= 1 << (num);
 315                 ep->naking = 1;
 316         } else
 317                 cnak_pending = cnak_pending & (~(1 << (num)));
 318 }
 319
 320
 321 /* Enables endpoint, is called by gadget driver */
 322 static int
 323 udc_ep_enable(struct usb_ep *usbep, const struct usb_endpoint_descriptor *desc)
 324 {
 325         struct udc_ep           *ep;
 326         struct udc              *dev;
 327         u32                     tmp;
 328         unsigned long           iflags;
 329         u8 udc_csr_epix;
 330         unsigned                maxpacket;
 331
 332         if (!usbep
 333                         || usbep->name == ep0_string
 334                         || !desc
 335                         || desc->bDescriptorType != USB_DT_ENDPOINT)
 336                 return -EINVAL;
 337
 338         ep = container_of(usbep, struct udc_ep, ep);
 339         dev = ep->dev;
 340
 341         DBG(dev, "udc_ep_enable() ep %d\n", ep->num);
 342
 343         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
 344                 return -ESHUTDOWN;
 345
 346         spin_lock_irqsave(&dev->lock, iflags);
 347         ep->desc = desc;
 348
 349         ep->halted = 0;
 350
 351         /* set traffic type */
 352         tmp = readl(&dev->ep[ep->num].regs->ctl);
 353         tmp = AMD_ADDBITS(tmp, desc->bmAttributes, UDC_EPCTL_ET);
 354         writel(tmp, &dev->ep[ep->num].regs->ctl);
 355
 356         /* set max packet size */
 357         maxpacket = le16_to_cpu(desc->wMaxPacketSize);
 358         tmp = readl(&dev->ep[ep->num].regs->bufout_maxpkt);
 359         tmp = AMD_ADDBITS(tmp, maxpacket, UDC_EP_MAX_PKT_SIZE);
 360         ep->ep.maxpacket = maxpacket;
 361         writel(tmp, &dev->ep[ep->num].regs->bufout_maxpkt);
 362
 363         /* IN ep */
 364         if (ep->in) {
 365
 366                 /* ep ix in UDC CSR register space */
 367                 udc_csr_epix = ep->num;
 368
 369                 /* set buffer size (tx fifo entries) */
 370                 tmp = readl(&dev->ep[ep->num].regs->bufin_framenum);
 371                 /* double buffering: fifo size = 2 x max packet size */
 372                 tmp = AMD_ADDBITS(
 373                                 tmp,
 374                                 maxpacket * UDC_EPIN_BUFF_SIZE_MULT
 375                                           / UDC_DWORD_BYTES,
 376                                 UDC_EPIN_BUFF_SIZE);
 377                 writel(tmp, &dev->ep[ep->num].regs->bufin_framenum);
 378
 379                 /* calc. tx fifo base addr */
 380                 udc_set_txfifo_addr(ep);
 381
 382                 /* flush fifo */
 383                 tmp = readl(&ep->regs->ctl);
 384                 tmp |= AMD_BIT(UDC_EPCTL_F);
 385                 writel(tmp, &ep->regs->ctl);
 386
 387         /* OUT ep */
 388         } else {
 389                 /* ep ix in UDC CSR register space */
 390                 udc_csr_epix = ep->num - UDC_CSR_EP_OUT_IX_OFS;
 391
 392                 /* set max packet size UDC CSR  */
 393                 tmp = readl(&dev->csr->ne[ep->num - UDC_CSR_EP_OUT_IX_OFS]);
 394                 tmp = AMD_ADDBITS(tmp, maxpacket,
 395                                         UDC_CSR_NE_MAX_PKT);
 396                 writel(tmp, &dev->csr->ne[ep->num - UDC_CSR_EP_OUT_IX_OFS]);
 397
 398                 if (use_dma && !ep->in) {
 399                         /* alloc and init BNA dummy request */
 400                         ep->bna_dummy_req = udc_alloc_bna_dummy(ep);
 401                         ep->bna_occurred = 0;
 402                 }
 403
 404                 if (ep->num != UDC_EP0OUT_IX)
 405                         dev->data_ep_enabled = 1;
 406         }
 407
 408         /* set ep values */
 409         tmp = readl(&dev->csr->ne[udc_csr_epix]);
 410         /* max packet */
 411         tmp = AMD_ADDBITS(tmp, maxpacket, UDC_CSR_NE_MAX_PKT);
 412         /* ep number */
 413         tmp = AMD_ADDBITS(tmp, desc->bEndpointAddress, UDC_CSR_NE_NUM);
 414         /* ep direction */
 415         tmp = AMD_ADDBITS(tmp, ep->in, UDC_CSR_NE_DIR);
 416         /* ep type */
 417         tmp = AMD_ADDBITS(tmp, desc->bmAttributes, UDC_CSR_NE_TYPE);
 418         /* ep config */
 419         tmp = AMD_ADDBITS(tmp, ep->dev->cur_config, UDC_CSR_NE_CFG);
 420         /* ep interface */
 421         tmp = AMD_ADDBITS(tmp, ep->dev->cur_intf, UDC_CSR_NE_INTF);
 422         /* ep alt */
 423         tmp = AMD_ADDBITS(tmp, ep->dev->cur_alt, UDC_CSR_NE_ALT);
 424         /* write reg */
 425         writel(tmp, &dev->csr->ne[udc_csr_epix]);
 426
 427         /* enable ep irq */
 428         tmp = readl(&dev->regs->ep_irqmsk);
 429         tmp &= AMD_UNMASK_BIT(ep->num);
 430         writel(tmp, &dev->regs->ep_irqmsk);
 431
 432         /*
 433          * clear NAK by writing CNAK
 434          * avoid BNA for OUT DMA, don't clear NAK until DMA desc. written
 435          */
 436         if (!use_dma || ep->in) {
 437                 tmp = readl(&ep->regs->ctl);
 438                 tmp |= AMD_BIT(UDC_EPCTL_CNAK);
 439                 writel(tmp, &ep->regs->ctl);
 440                 ep->naking = 0;
 441                 UDC_QUEUE_CNAK(ep, ep->num);
 442         }
 443         tmp = desc->bEndpointAddress;
 444         DBG(dev, "%s enabled\n", usbep->name);
 445
 446         spin_unlock_irqrestore(&dev->lock, iflags);
 447         return 0;
 448 }
 449
 450 /* Resets endpoint */
 451 static void ep_init(struct udc_regs __iomem *regs, struct udc_ep *ep)
 452 {
 453         u32             tmp;
 454
 455         VDBG(ep->dev, "ep-%d reset\n", ep->num);
 456         ep->desc = NULL;
 457         ep->ep.ops = &udc_ep_ops;
 458         INIT_LIST_HEAD(&ep->queue);
 459
 460         ep->ep.maxpacket = (u16) ~0;
 461         /* set NAK */
 462         tmp = readl(&ep->regs->ctl);
 463         tmp |= AMD_BIT(UDC_EPCTL_SNAK);
 464         writel(tmp, &ep->regs->ctl);
 465         ep->naking = 1;
 466
 467         /* disable interrupt */
 468         tmp = readl(&regs->ep_irqmsk);
 469         tmp |= AMD_BIT(ep->num);
 470         writel(tmp, &regs->ep_irqmsk);
 471
 472         if (ep->in) {
 473                 /* unset P and IN bit of potential former DMA */
 474                 tmp = readl(&ep->regs->ctl);
 475                 tmp &= AMD_UNMASK_BIT(UDC_EPCTL_P);
 476                 writel(tmp, &ep->regs->ctl);
 477
 478                 tmp = readl(&ep->regs->sts);
 479                 tmp |= AMD_BIT(UDC_EPSTS_IN);
 480                 writel(tmp, &ep->regs->sts);
 481
 482                 /* flush the fifo */
 483                 tmp = readl(&ep->regs->ctl);
 484                 tmp |= AMD_BIT(UDC_EPCTL_F);
 485                 writel(tmp, &ep->regs->ctl);
 486
 487         }
 488         /* reset desc pointer */
 489         writel(0, &ep->regs->desptr);
 490 }
 491
 492 /* Disables endpoint, is called by gadget driver */
 493 static int udc_ep_disable(struct usb_ep *usbep)
 494 {
 495         struct udc_ep   *ep = NULL;
 496         unsigned long   iflags;
 497
 498         if (!usbep)
 499                 return -EINVAL;
 500
 501         ep = container_of(usbep, struct udc_ep, ep);
 502         if (usbep->name == ep0_string || !ep->desc)
 503                 return -EINVAL;
 504
 505         DBG(ep->dev, "Disable ep-%d\n", ep->num);
 506
 507         spin_lock_irqsave(&ep->dev->lock, iflags);
 508         udc_free_request(&ep->ep, &ep->bna_dummy_req->req);
 509         empty_req_queue(ep);
 510         ep_init(ep->dev->regs, ep);
 511         spin_unlock_irqrestore(&ep->dev->lock, iflags);
 512
 513         return 0;
 514 }
 515
 516 /* Allocates request packet, called by gadget driver */
 517 static struct usb_request *
 518 udc_alloc_request(struct usb_ep *usbep, gfp_t gfp)
 519 {
 520         struct udc_request      *req;
 521         struct udc_data_dma     *dma_desc;
 522         struct udc_ep   *ep;
 523
 524         if (!usbep)
 525                 return NULL;
 526
 527         ep = container_of(usbep, struct udc_ep, ep);
 528
 529         VDBG(ep->dev, "udc_alloc_req(): ep%d\n", ep->num);
 530         req = kzalloc(sizeof(struct udc_request), gfp);
 531         if (!req)
 532                 return NULL;
 533
 534         req->req.dma = DMA_DONT_USE;
 535         INIT_LIST_HEAD(&req->queue);
 536
 537         if (ep->dma) {
 538                 /* ep0 in requests are allocated from data pool here */
 539                 dma_desc = pci_pool_alloc(ep->dev->data_requests, gfp,
 540                                                 &req->td_phys);
 541                 if (!dma_desc) {
 542                         kfree(req);
 543                         return NULL;
 544                 }
 545
 546                 VDBG(ep->dev, "udc_alloc_req: req = %p dma_desc = %p, "
 547                                 "td_phys = %lx\n",
 548                                 req, dma_desc,
 549                                 (unsigned long)req->td_phys);
 550                 /* prevent from using desc. - set HOST BUSY */
 551                 dma_desc->status = AMD_ADDBITS(dma_desc->status,
 552                                                 UDC_DMA_STP_STS_BS_HOST_BUSY,
 553                                                 UDC_DMA_STP_STS_BS);
 554                 dma_desc->bufptr = cpu_to_le32(DMA_DONT_USE);
 555                 req->td_data = dma_desc;
 556                 req->td_data_last = NULL;
 557                 req->chain_len = 1;
 558         }
 559
 560         return &req->req;
 561 }
 562
 563 /* Frees request packet, called by gadget driver */
 564 static void
 565 udc_free_request(struct usb_ep *usbep, struct usb_request *usbreq)
 566 {
 567         struct udc_ep   *ep;
 568         struct udc_request      *req;
 569
 570         if (!usbep || !usbreq)
 571                 return;
 572
 573         ep = container_of(usbep, struct udc_ep, ep);
 574         req = container_of(usbreq, struct udc_request, req);
 575         VDBG(ep->dev, "free_req req=%p\n", req);
 576         BUG_ON(!list_empty(&req->queue));
 577         if (req->td_data) {
 578                 VDBG(ep->dev, "req->td_data=%p\n", req->td_data);
 579
 580                 /* free dma chain if created */
 581                 if (req->chain_len > 1) {
 582                         udc_free_dma_chain(ep->dev, req);
 583                 }
 584
 585                 pci_pool_free(ep->dev->data_requests, req->td_data,
 586                                                         req->td_phys);
 587         }
 588         kfree(req);
 589 }
 590
 591 /* Init BNA dummy descriptor for HOST BUSY and pointing to itself */
 592 static void udc_init_bna_dummy(struct udc_request *req)
 593 {
 594         if (req) {
 595                 /* set last bit */
 596                 req->td_data->status |= AMD_BIT(UDC_DMA_IN_STS_L);
 597                 /* set next pointer to itself */
 598                 req->td_data->next = req->td_phys;
 599                 /* set HOST BUSY */
 600                 req->td_data->status
 601                         = AMD_ADDBITS(req->td_data->status,
 602                                         UDC_DMA_STP_STS_BS_DMA_DONE,
 603                                         UDC_DMA_STP_STS_BS);
 604 #ifdef UDC_VERBOSE
 605                 pr_debug("bna desc = %p, sts = %08x\n",
 606                         req->td_data, req->td_data->status);
 607 #endif
 608         }
 609 }
 610
 611 /* Allocate BNA dummy descriptor */
 612 static struct udc_request *udc_alloc_bna_dummy(struct udc_ep *ep)
 613 {
 614         struct udc_request *req = NULL;
 615         struct usb_request *_req = NULL;
 616
 617         /* alloc the dummy request */
 618         _req = udc_alloc_request(&ep->ep, GFP_ATOMIC);
 619         if (_req) {
 620                 req = container_of(_req, struct udc_request, req);
 621                 ep->bna_dummy_req = req;
 622                 udc_init_bna_dummy(req);
 623         }
 624         return req;
 625 }
 626
 627 /* Write data to TX fifo for IN packets */
 628 static void
 629 udc_txfifo_write(struct udc_ep *ep, struct usb_request *req)
 630 {
 631         u8                      *req_buf;
 632         u32                     *buf;
 633         int                     i, j;
 634         unsigned                bytes = 0;
 635         unsigned                remaining = 0;
 636
 637         if (!req || !ep)
 638                 return;
 639
 640         req_buf = req->buf + req->actual;
 641         prefetch(req_buf);
 642         remaining = req->length - req->actual;
 643
 644         buf = (u32 *) req_buf;
 645
 646         bytes = ep->ep.maxpacket;
 647         if (bytes > remaining)
 648                 bytes = remaining;
 649
 650         /* dwords first */
 651         for (i = 0; i < bytes / UDC_DWORD_BYTES; i++) {
 652                 writel(*(buf + i), ep->txfifo);
 653         }
 654
 655         /* remaining bytes must be written by byte access */
 656         for (j = 0; j < bytes % UDC_DWORD_BYTES; j++) {
 657                 writeb((u8)(*(buf + i) >> (j << UDC_BITS_PER_BYTE_SHIFT)),
 658                                                         ep->txfifo);
 659         }
 660
 661         /* dummy write confirm */
 662         writel(0, &ep->regs->confirm);
 663 }
 664
 665 /* Read dwords from RX fifo for OUT transfers */
 666 static int udc_rxfifo_read_dwords(struct udc *dev, u32 *buf, int dwords)
 667 {
 668         int i;
 669
 670         VDBG(dev, "udc_read_dwords(): %d dwords\n", dwords);
 671
 672         for (i = 0; i < dwords; i++) {
 673                 *(buf + i) = readl(dev->rxfifo);
 674         }
 675         return 0;
 676 }
 677
 678 /* Read bytes from RX fifo for OUT transfers */
 679 static int udc_rxfifo_read_bytes(struct udc *dev, u8 *buf, int bytes)
 680 {
 681         int i, j;
 682         u32 tmp;
 683
 684         VDBG(dev, "udc_read_bytes(): %d bytes\n", bytes);
 685
 686         /* dwords first */
 687         for (i = 0; i < bytes / UDC_DWORD_BYTES; i++) {
 688                 *((u32 *)(buf + (i<<2))) = readl(dev->rxfifo);
 689         }
 690
 691         /* remaining bytes must be read by byte access */
 692         if (bytes % UDC_DWORD_BYTES) {
 693                 tmp = readl(dev->rxfifo);
 694                 for (j = 0; j < bytes % UDC_DWORD_BYTES; j++) {
 695                         *(buf + (i<<2) + j) = (u8)(tmp & UDC_BYTE_MASK);
 696                         tmp = tmp >> UDC_BITS_PER_BYTE;
 697                 }
 698         }
 699
 700         return 0;
 701 }
 702
 703 /* Read data from RX fifo for OUT transfers */
 704 static int
 705 udc_rxfifo_read(struct udc_ep *ep, struct udc_request *req)
 706 {
 707         u8 *buf;
 708         unsigned buf_space;
 709         unsigned bytes = 0;
 710         unsigned finished = 0;
 711
 712         /* received number bytes */
 713         bytes = readl(&ep->regs->sts);
 714         bytes = AMD_GETBITS(bytes, UDC_EPSTS_RX_PKT_SIZE);
 715
 716         buf_space = req->req.length - req->req.actual;
 717         buf = req->req.buf + req->req.actual;
 718         if (bytes > buf_space) {
 719                 if ((buf_space % ep->ep.maxpacket) != 0) {
 720                         DBG(ep->dev,
 721                                 "%s: rx %d bytes, rx-buf space = %d bytesn\n",
 722                                 ep->ep.name, bytes, buf_space);
 723                         req->req.status = -EOVERFLOW;
 724                 }
 725                 bytes = buf_space;
 726         }
 727         req->req.actual += bytes;
 728
 729         /* last packet ? */
 730         if (((bytes % ep->ep.maxpacket) != 0) || (!bytes)
 731                 || ((req->req.actual == req->req.length) && !req->req.zero))
 732                 finished = 1;
 733
 734         /* read rx fifo bytes */
 735         VDBG(ep->dev, "ep %s: rxfifo read %d bytes\n", ep->ep.name, bytes);
 736         udc_rxfifo_read_bytes(ep->dev, buf, bytes);
 737
 738         return finished;
 739 }
 740
 741 /* create/re-init a DMA descriptor or a DMA descriptor chain */
 742 static int prep_dma(struct udc_ep *ep, struct udc_request *req, gfp_t gfp)
 743 {
 744         int     retval = 0;
 745         u32     tmp;
 746
 747         VDBG(ep->dev, "prep_dma\n");
 748         VDBG(ep->dev, "prep_dma ep%d req->td_data=%p\n",
 749                         ep->num, req->td_data);
 750
 751         /* set buffer pointer */
 752         req->td_data->bufptr = req->req.dma;
 753
 754         /* set last bit */
 755         req->td_data->status |= AMD_BIT(UDC_DMA_IN_STS_L);
 756
 757         /* build/re-init dma chain if maxpkt scatter mode, not for EP0 */
 758         if (use_dma_ppb) {
 759
 760                 retval = udc_create_dma_chain(ep, req, ep->ep.maxpacket, gfp);
 761                 if (retval != 0) {
 762                         if (retval == -ENOMEM)
 763                                 DBG(ep->dev, "Out of DMA memory\n");
 764                         return retval;
 765                 }
 766                 if (ep->in) {
 767                         if (req->req.length == ep->ep.maxpacket) {
 768                                 /* write tx bytes */
 769                                 req->td_data->status =
 770                                         AMD_ADDBITS(req->td_data->status,
 771                                                 ep->ep.maxpacket,
 772                                                 UDC_DMA_IN_STS_TXBYTES);
 773
 774                         }
 775                 }
 776
 777         }
 778
 779         if (ep->in) {
 780                 VDBG(ep->dev, "IN: use_dma_ppb=%d req->req.len=%d "
 781                                 "maxpacket=%d ep%d\n",
 782                                 use_dma_ppb, req->req.length,
 783                                 ep->ep.maxpacket, ep->num);
 784                 /*
 785                  * if bytes < max packet then tx bytes must
 786                  * be written in packet per buffer mode
 787                  */
 788                 if (!use_dma_ppb || req->req.length < ep->ep.maxpacket
 789                                 || ep->num == UDC_EP0OUT_IX
 790                                 || ep->num == UDC_EP0IN_IX) {
 791                         /* write tx bytes */
 792                         req->td_data->status =
 793                                 AMD_ADDBITS(req->td_data->status,
 794                                                 req->req.length,
 795                                                 UDC_DMA_IN_STS_TXBYTES);
 796                         /* reset frame num */
 797                         req->td_data->status =
 798                                 AMD_ADDBITS(req->td_data->status,
 799                                                 0,
 800                                                 UDC_DMA_IN_STS_FRAMENUM);
 801                 }
 802                 /* set HOST BUSY */
 803                 req->td_data->status =
 804                         AMD_ADDBITS(req->td_data->status,
 805                                 UDC_DMA_STP_STS_BS_HOST_BUSY,
 806                                 UDC_DMA_STP_STS_BS);
 807         } else {
 808                 VDBG(ep->dev, "OUT set host ready\n");
 809                 /* set HOST READY */
 810                 req->td_data->status =
 811                         AMD_ADDBITS(req->td_data->status,
 812                                 UDC_DMA_STP_STS_BS_HOST_READY,
 813                                 UDC_DMA_STP_STS_BS);
 814
 815
 816                         /* clear NAK by writing CNAK */
 817                         if (ep->naking) {
 818                                 tmp = readl(&ep->regs->ctl);
 819                                 tmp |= AMD_BIT(UDC_EPCTL_CNAK);
 820                                 writel(tmp, &ep->regs->ctl);
 821                                 ep->naking = 0;
 822                                 UDC_QUEUE_CNAK(ep, ep->num);
 823                         }
 824
 825         }
 826
 827         return retval;
 828 }
 829
 830 /* Completes request packet ... caller MUST hold lock */
 831 static void
 832 complete_req(struct udc_ep *ep, struct udc_request *req, int sts)
 833 __releases(ep->dev->lock)
 834 __acquires(ep->dev->lock)
 835 {
 836         struct udc              *dev;
 837         unsigned                halted;
 838
 839         VDBG(ep->dev, "complete_req(): ep%d\n", ep->num);
 840
 841         dev = ep->dev;
 842         /* unmap DMA */
 843         if (req->dma_mapping) {
 844                 if (ep->in)
 845                         pci_unmap_single(dev->pdev,
 846                                         req->req.dma,
 847                                         req->req.length,
 848                                         PCI_DMA_TODEVICE);
 849                 else
 850                         pci_unmap_single(dev->pdev,
 851                                         req->req.dma,
 852                                         req->req.length,
 853                                         PCI_DMA_FROMDEVICE);
 854                 req->dma_mapping = 0;
 855                 req->req.dma = DMA_DONT_USE;
 856         }
 857
 858         halted = ep->halted;
 859         ep->halted = 1;
 860
 861         /* set new status if pending */
 862         if (req->req.status == -EINPROGRESS)
 863                 req->req.status = sts;
 864
 865         /* remove from ep queue */
 866         list_del_init(&req->queue);
 867
 868         VDBG(ep->dev, "req %p => complete %d bytes at %s with sts %d\n",
 869                 &req->req, req->req.length, ep->ep.name, sts);
 870
 871         spin_unlock(&dev->lock);
 872         req->req.complete(&ep->ep, &req->req);
 873         spin_lock(&dev->lock);
 874         ep->halted = halted;
 875 }
 876
 877 /* frees pci pool descriptors of a DMA chain */
 878 static int udc_free_dma_chain(struct udc *dev, struct udc_request *req)
 879 {
 880
 881         int ret_val = 0;
 882         struct udc_data_dma     *td;
 883         struct udc_data_dma     *td_last = NULL;
 884         unsigned int i;
 885
 886         DBG(dev, "free chain req = %p\n", req);
 887
 888         /* do not free first desc., will be done by free for request */
 889         td_last = req->td_data;
 890         td = phys_to_virt(td_last->next);
 891
 892         for (i = 1; i < req->chain_len; i++) {
 893
 894                 pci_pool_free(dev->data_requests, td,
 895                                 (dma_addr_t) td_last->next);
 896                 td_last = td;
 897                 td = phys_to_virt(td_last->next);
 898         }
 899
 900         return ret_val;
 901 }
 902
 903 /* Iterates to the end of a DMA chain and returns last descriptor */
 904 static struct udc_data_dma *udc_get_last_dma_desc(struct udc_request *req)
 905 {
 906         struct udc_data_dma     *td;
 907
 908         td = req->td_data;
 909         while (td && !(td->status & AMD_BIT(UDC_DMA_IN_STS_L))) {
 910                 td = phys_to_virt(td->next);
 911         }
 912
 913         return td;
 914
 915 }
 916
 917 /* Iterates to the end of a DMA chain and counts bytes received */
 918 static u32 udc_get_ppbdu_rxbytes(struct udc_request *req)
 919 {
 920         struct udc_data_dma     *td;
 921         u32 count;
 922
 923         td = req->td_data;
 924         /* received number bytes */
 925         count = AMD_GETBITS(td->status, UDC_DMA_OUT_STS_RXBYTES);
 926
 927         while (td && !(td->status & AMD_BIT(UDC_DMA_IN_STS_L))) {
 928                 td = phys_to_virt(td->next);
 929                 /* received number bytes */
 930                 if (td) {
 931                         count += AMD_GETBITS(td->status,
 932                                 UDC_DMA_OUT_STS_RXBYTES);
 933                 }
 934         }
 935
 936         return count;
 937
 938 }
 939
 940 /* Creates or re-inits a DMA chain */
 941 static int udc_create_dma_chain(
 942         struct udc_ep *ep,
 943         struct udc_request *req,
 944         unsigned long buf_len, gfp_t gfp_flags
 945 )
 946 {
 947         unsigned long bytes = req->req.length;
 948         unsigned int i;
 949         dma_addr_t dma_addr;
 950         struct udc_data_dma     *td = NULL;
 951         struct udc_data_dma     *last = NULL;
 952         unsigned long txbytes;
 953         unsigned create_new_chain = 0;
 954         unsigned len;
 955
 956         VDBG(ep->dev, "udc_create_dma_chain: bytes=%ld buf_len=%ld\n",
 957                         bytes, buf_len);
 958         dma_addr = DMA_DONT_USE;
 959
 960         /* unset L bit in first desc for OUT */
 961         if (!ep->in) {
 962                 req->td_data->status &= AMD_CLEAR_BIT(UDC_DMA_IN_STS_L);
 963         }
 964
 965         /* alloc only new desc's if not already available */
 966         len = req->req.length / ep->ep.maxpacket;
 967         if (req->req.length % ep->ep.maxpacket) {
 968                 len++;
 969         }
 970
 971         if (len > req->chain_len) {
 972                 /* shorter chain already allocated before */
 973                 if (req->chain_len > 1) {
 974                         udc_free_dma_chain(ep->dev, req);
 975                 }
 976                 req->chain_len = len;
 977                 create_new_chain = 1;
 978         }
 979
 980         td = req->td_data;
 981         /* gen. required number of descriptors and buffers */
 982         for (i = buf_len; i < bytes; i += buf_len) {
 983                 /* create or determine next desc. */
 984                 if (create_new_chain) {
 985
 986                         td = pci_pool_alloc(ep->dev->data_requests,
 987                                         gfp_flags, &dma_addr);
 988                         if (!td)
 989                                 return -ENOMEM;
 990
 991                         td->status = 0;
 992                 } else if (i == buf_len) {
 993                         /* first td */
 994                         td = (struct udc_data_dma *) phys_to_virt(
 995                                                 req->td_data->next);
 996                         td->status = 0;
 997                 } else {
 998                         td = (struct udc_data_dma *) phys_to_virt(last->next);
 999                         td->status = 0;
1000                 }
1001
1002
1003                 if (td)
1004                         td->bufptr = req->req.dma + i; /* assign buffer */
1005                 else
1006                         break;
1007
1008                 /* short packet ? */
1009                 if ((bytes - i) >= buf_len) {
1010                         txbytes = buf_len;
1011                 } else {
1012                         /* short packet */
1013                         txbytes = bytes - i;
1014                 }
1015
1016                 /* link td and assign tx bytes */
1017                 if (i == buf_len) {
1018                         if (create_new_chain) {
1019                                 req->td_data->next = dma_addr;
1020                         } else {
1021                                 /* req->td_data->next = virt_to_phys(td); */
1022                         }
1023                         /* write tx bytes */
1024                         if (ep->in) {
1025                                 /* first desc */
1026                                 req->td_data->status =
1027                                         AMD_ADDBITS(req->td_data->status,
1028                                                         ep->ep.maxpacket,
1029                                                         UDC_DMA_IN_STS_TXBYTES);
1030                                 /* second desc */
1031                                 td->status = AMD_ADDBITS(td->status,
1032                                                         txbytes,
1033                                                         UDC_DMA_IN_STS_TXBYTES);
1034                         }
1035                 } else {
1036                         if (create_new_chain) {
1037                                 last->next = dma_addr;
1038                         } else {
1039                                 /* last->next = virt_to_phys(td); */
1040                         }
1041                         if (ep->in) {
1042                                 /* write tx bytes */
1043                                 td->status = AMD_ADDBITS(td->status,
1044                                                         txbytes,
1045                                                         UDC_DMA_IN_STS_TXBYTES);
1046                         }
1047                 }
1048                 last = td;
1049         }
1050         /* set last bit */
1051         if (td) {
1052                 td->status |= AMD_BIT(UDC_DMA_IN_STS_L);
1053                 /* last desc. points to itself */
1054                 req->td_data_last = td;
1055         }
1056
1057         return 0;
1058 }
1059
1060 /* Enabling RX DMA */
1061 static void udc_set_rde(struct udc *dev)
1062 {
1063         u32 tmp;
1064
1065         VDBG(dev, "udc_set_rde()\n");
1066         /* stop RDE timer */
1067         if (timer_pending(&udc_timer)) {
1068                 set_rde = 0;
1069                 mod_timer(&udc_timer, jiffies - 1);
1070         }
1071         /* set RDE */
1072         tmp = readl(&dev->regs->ctl);
1073         tmp |= AMD_BIT(UDC_DEVCTL_RDE);
1074         writel(tmp, &dev->regs->ctl);
1075 }
1076
1077 /* Queues a request packet, called by gadget driver */
1078 static int
1079 udc_queue(struct usb_ep *usbep, struct usb_request *usbreq, gfp_t gfp)
1080 {
1081         int                     retval = 0;
1082         u8                      open_rxfifo = 0;
1083         unsigned long           iflags;
1084         struct udc_ep           *ep;
1085         struct udc_request      *req;
1086         struct udc              *dev;
1087         u32                     tmp;
1088
1089         /* check the inputs */
1090         req = container_of(usbreq, struct udc_request, req);
1091
1092         if (!usbep || !usbreq || !usbreq->complete || !usbreq->buf
1093                         || !list_empty(&req->queue))
1094                 return -EINVAL;
1095
1096         ep = container_of(usbep, struct udc_ep, ep);
1097         if (!ep->desc && (ep->num != 0 && ep->num != UDC_EP0OUT_IX))
1098                 return -EINVAL;
1099
1100         VDBG(ep->dev, "udc_queue(): ep%d-in=%d\n", ep->num, ep->in);
1101         dev = ep->dev;
1102
1103         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
1104                 return -ESHUTDOWN;
1105
1106         /* map dma (usually done before) */
1107         if (ep->dma && usbreq->length != 0
1108                         && (usbreq->dma == DMA_DONT_USE || usbreq->dma == 0)) {
1109                 VDBG(dev, "DMA map req %p\n", req);
1110                 if (ep->in)
1111                         usbreq->dma = pci_map_single(dev->pdev,
1112                                                 usbreq->buf,
1113                                                 usbreq->length,
1114                                                 PCI_DMA_TODEVICE);
1115                 else
1116                         usbreq->dma = pci_map_single(dev->pdev,
1117                                                 usbreq->buf,
1118                                                 usbreq->length,
1119                                                 PCI_DMA_FROMDEVICE);
1120                 req->dma_mapping = 1;
1121         }
1122
1123         VDBG(dev, "%s queue req %p, len %d req->td_data=%p buf %p\n",
1124                         usbep->name, usbreq, usbreq->length,
1125                         req->td_data, usbreq->buf);
1126
1127         spin_lock_irqsave(&dev->lock, iflags);
1128         usbreq->actual = 0;
1129         usbreq->status = -EINPROGRESS;
1130         req->dma_done = 0;
1131
1132         /* on empty queue just do first transfer */
1133         if (list_empty(&ep->queue)) {
1134                 /* zlp */
1135                 if (usbreq->length == 0) {
1136                         /* IN zlp's are handled by hardware */
1137                         complete_req(ep, req, 0);
1138                         VDBG(dev, "%s: zlp\n", ep->ep.name);
1139                         /*
1140                          * if set_config or set_intf is waiting for ack by zlp
1141                          * then set CSR_DONE
1142                          */
1143                         if (dev->set_cfg_not_acked) {
1144                                 tmp = readl(&dev->regs->ctl);
1145                                 tmp |= AMD_BIT(UDC_DEVCTL_CSR_DONE);
1146                                 writel(tmp, &dev->regs->ctl);
1147                                 dev->set_cfg_not_acked = 0;
1148                         }
1149                         /* setup command is ACK'ed now by zlp */
1150                         if (dev->waiting_zlp_ack_ep0in) {
1151                                 /* clear NAK by writing CNAK in EP0_IN */
1152                                 tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
1153                                 tmp |= AMD_BIT(UDC_EPCTL_CNAK);
1154                                 writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
1155                                 dev->ep[UDC_EP0IN_IX].naking = 0;
1156                                 UDC_QUEUE_CNAK(&dev->ep[UDC_EP0IN_IX],
1157                                                         UDC_EP0IN_IX);
1158                                 dev->waiting_zlp_ack_ep0in = 0;
1159                         }
1160                         goto finished;
1161                 }
1162                 if (ep->dma) {
1163                         retval = prep_dma(ep, req, gfp);
1164                         if (retval != 0)
1165                                 goto finished;
1166                         /* write desc pointer to enable DMA */
1167                         if (ep->in) {
1168                                 /* set HOST READY */
1169                                 req->td_data->status =
1170                                         AMD_ADDBITS(req->td_data->status,
1171                                                 UDC_DMA_IN_STS_BS_HOST_READY,
1172                                                 UDC_DMA_IN_STS_BS);
1173                         }
1174
1175                         /* disabled rx dma while descriptor update */
1176                         if (!ep->in) {
1177                                 /* stop RDE timer */
1178                                 if (timer_pending(&udc_timer)) {
1179                                         set_rde = 0;
1180                                         mod_timer(&udc_timer, jiffies - 1);
1181                                 }
1182                                 /* clear RDE */
1183                                 tmp = readl(&dev->regs->ctl);
1184                                 tmp &= AMD_UNMASK_BIT(UDC_DEVCTL_RDE);
1185                                 writel(tmp, &dev->regs->ctl);
1186                                 open_rxfifo = 1;
1187
1188                                 /*
1189                                  * if BNA occurred then let BNA dummy desc.
1190                                  * point to current desc.
1191                                  */
1192                                 if (ep->bna_occurred) {
1193                                         VDBG(dev, "copy to BNA dummy desc.\n");
1194                                         memcpy(ep->bna_dummy_req->td_data,
1195                                                 req->td_data,
1196                                                 sizeof(struct udc_data_dma));
1197                                 }
1198                         }
1199                         /* write desc pointer */
1200                         writel(req->td_phys, &ep->regs->desptr);
1201
1202                         /* clear NAK by writing CNAK */
1203                         if (ep->naking) {
1204                                 tmp = readl(&ep->regs->ctl);
1205                                 tmp |= AMD_BIT(UDC_EPCTL_CNAK);
1206                                 writel(tmp, &ep->regs->ctl);
1207                                 ep->naking = 0;
1208                                 UDC_QUEUE_CNAK(ep, ep->num);
1209                         }
1210
1211                         if (ep->in) {
1212                                 /* enable ep irq */
1213                                 tmp = readl(&dev->regs->ep_irqmsk);
1214                                 tmp &= AMD_UNMASK_BIT(ep->num);
1215                                 writel(tmp, &dev->regs->ep_irqmsk);
1216                         }
1217                 }
1218
1219         } else if (ep->dma) {
1220
1221                 /*
1222                  * prep_dma not used for OUT ep's, this is not possible
1223                  * for PPB modes, because of chain creation reasons
1224                  */
1225                 if (ep->in) {
1226                         retval = prep_dma(ep, req, gfp);
1227                         if (retval != 0)
1228                                 goto finished;
1229                 }
1230         }
1231         VDBG(dev, "list_add\n");
1232         /* add request to ep queue */
1233         if (req) {
1234
1235                 list_add_tail(&req->queue, &ep->queue);
1236
1237                 /* open rxfifo if out data queued */
1238                 if (open_rxfifo) {
1239                         /* enable DMA */
1240                         req->dma_going = 1;
1241                         udc_set_rde(dev);
1242                         if (ep->num != UDC_EP0OUT_IX)
1243                                 dev->data_ep_queued = 1;
1244                 }
1245                 /* stop OUT naking */
1246                 if (!ep->in) {
1247                         if (!use_dma && udc_rxfifo_pending) {
1248                                 DBG(dev, "udc_queue(): pending bytes in "
1249                                         "rxfifo after nyet\n");
1250                                 /*
1251                                  * read pending bytes afer nyet:
1252                                  * referring to isr
1253                                  */
1254                                 if (udc_rxfifo_read(ep, req)) {
1255                                         /* finish */
1256                                         complete_req(ep, req, 0);
1257                                 }
1258                                 udc_rxfifo_pending = 0;
1259
1260                         }
1261                 }
1262         }
1263
1264 finished:
1265         spin_unlock_irqrestore(&dev->lock, iflags);
1266         return retval;
1267 }
1268
1269 /* Empty request queue of an endpoint; caller holds spinlock */
1270 static void empty_req_queue(struct udc_ep *ep)
1271 {
1272         struct udc_request      *req;
1273
1274         ep->halted = 1;
1275         while (!list_empty(&ep->queue)) {
1276                 req = list_entry(ep->queue.next,
1277                         struct udc_request,
1278                         queue);
1279                 complete_req(ep, req, -ESHUTDOWN);
1280         }
1281 }
1282
1283 /* Dequeues a request packet, called by gadget driver */
1284 static int udc_dequeue(struct usb_ep *usbep, struct usb_request *usbreq)
1285 {
1286         struct udc_ep           *ep;
1287         struct udc_request      *req;
1288         unsigned                halted;
1289         unsigned long           iflags;
1290
1291         ep = container_of(usbep, struct udc_ep, ep);
1292         if (!usbep || !usbreq || (!ep->desc && (ep->num != 0
1293                                 && ep->num != UDC_EP0OUT_IX)))
1294                 return -EINVAL;
1295
1296         req = container_of(usbreq, struct udc_request, req);
1297
1298         spin_lock_irqsave(&ep->dev->lock, iflags);
1299         halted = ep->halted;
1300         ep->halted = 1;
1301         /* request in processing or next one */
1302         if (ep->queue.next == &req->queue) {
1303                 if (ep->dma && req->dma_going) {
1304                         if (ep->in)
1305                                 ep->cancel_transfer = 1;
1306                         else {
1307                                 u32 tmp;
1308                                 u32 dma_sts;
1309                                 /* stop potential receive DMA */
1310                                 tmp = readl(&udc->regs->ctl);
1311                                 writel(tmp & AMD_UNMASK_BIT(UDC_DEVCTL_RDE),
1312                                                         &udc->regs->ctl);
1313                                 /*
1314                                  * Cancel transfer later in ISR
1315                                  * if descriptor was touched.
1316                                  */
1317                                 dma_sts = AMD_GETBITS(req->td_data->status,
1318                                                         UDC_DMA_OUT_STS_BS);
1319                                 if (dma_sts != UDC_DMA_OUT_STS_BS_HOST_READY)
1320                                         ep->cancel_transfer = 1;
1321                                 else {
1322                                         udc_init_bna_dummy(ep->req);
1323                                         writel(ep->bna_dummy_req->td_phys,
1324                                                 &ep->regs->desptr);
1325                                 }
1326                                 writel(tmp, &udc->regs->ctl);
1327                         }
1328                 }
1329         }
1330         complete_req(ep, req, -ECONNRESET);
1331         ep->halted = halted;
1332
1333         spin_unlock_irqrestore(&ep->dev->lock, iflags);
1334         return 0;
1335 }
1336
1337 /* Halt or clear halt of endpoint */
1338 static int
1339 udc_set_halt(struct usb_ep *usbep, int halt)
1340 {
1341         struct udc_ep   *ep;
1342         u32 tmp;
1343         unsigned long iflags;
1344         int retval = 0;
1345
1346         if (!usbep)
1347                 return -EINVAL;
1348
1349         pr_debug("set_halt %s: halt=%d\n", usbep->name, halt);
1350
1351         ep = container_of(usbep, struct udc_ep, ep);
1352         if (!ep->desc && (ep->num != 0 && ep->num != UDC_EP0OUT_IX))
1353                 return -EINVAL;
1354         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
1355                 return -ESHUTDOWN;
1356
1357         spin_lock_irqsave(&udc_stall_spinlock, iflags);
1358         /* halt or clear halt */
1359         if (halt) {
1360                 if (ep->num == 0)
1361                         ep->dev->stall_ep0in = 1;
1362                 else {
1363                         /*
1364                          * set STALL
1365                          * rxfifo empty not taken into acount
1366                          */
1367                         tmp = readl(&ep->regs->ctl);
1368                         tmp |= AMD_BIT(UDC_EPCTL_S);
1369                         writel(tmp, &ep->regs->ctl);
1370                         ep->halted = 1;
1371
1372                         /* setup poll timer */
1373                         if (!timer_pending(&udc_pollstall_timer)) {
1374                                 udc_pollstall_timer.expires = jiffies +
1375                                         HZ * UDC_POLLSTALL_TIMER_USECONDS
1376                                         / (1000 * 1000);
1377                                 if (!stop_pollstall_timer) {
1378                                         DBG(ep->dev, "start polltimer\n");
1379                                         add_timer(&udc_pollstall_timer);
1380                                 }
1381                         }
1382                 }
1383         } else {
1384                 /* ep is halted by set_halt() before */
1385                 if (ep->halted) {
1386                         tmp = readl(&ep->regs->ctl);
1387                         /* clear stall bit */
1388                         tmp = tmp & AMD_CLEAR_BIT(UDC_EPCTL_S);
1389                         /* clear NAK by writing CNAK */
1390                         tmp |= AMD_BIT(UDC_EPCTL_CNAK);
1391                         writel(tmp, &ep->regs->ctl);
1392                         ep->halted = 0;
1393                         UDC_QUEUE_CNAK(ep, ep->num);
1394                 }
1395         }
1396         spin_unlock_irqrestore(&udc_stall_spinlock, iflags);
1397         return retval;
1398 }
1399
1400 /* gadget interface */
1401 static const struct usb_ep_ops udc_ep_ops = {
1402         .enable         = udc_ep_enable,
1403         .disable        = udc_ep_disable,
1404
1405         .alloc_request  = udc_alloc_request,
1406         .free_request   = udc_free_request,
1407
1408         .queue          = udc_queue,
1409         .dequeue        = udc_dequeue,
1410
1411         .set_halt       = udc_set_halt,
1412         /* fifo ops not implemented */
1413 };
1414
1415 /*-------------------------------------------------------------------------*/
1416
1417 /* Get frame counter (not implemented) */
1418 static int udc_get_frame(struct usb_gadget *gadget)
1419 {
1420         return -EOPNOTSUPP;
1421 }
1422
1423 /* Remote wakeup gadget interface */
1424 static int udc_wakeup(struct usb_gadget *gadget)
1425 {
1426         struct udc              *dev;
1427
1428         if (!gadget)
1429                 return -EINVAL;
1430         dev = container_of(gadget, struct udc, gadget);
1431         udc_remote_wakeup(dev);
1432
1433         return 0;
1434 }
1435
1436 /* gadget operations */
1437 static const struct usb_gadget_ops udc_ops = {
1438         .wakeup         = udc_wakeup,
1439         .get_frame      = udc_get_frame,
1440 };
1441
1442 /* Setups endpoint parameters, adds endpoints to linked list */
1443 static void make_ep_lists(struct udc *dev)
1444 {
1445         /* make gadget ep lists */
1446         INIT_LIST_HEAD(&dev->gadget.ep_list);
1447         list_add_tail(&dev->ep[UDC_EPIN_STATUS_IX].ep.ep_list,
1448                                                 &dev->gadget.ep_list);
1449         list_add_tail(&dev->ep[UDC_EPIN_IX].ep.ep_list,
1450                                                 &dev->gadget.ep_list);
1451         list_add_tail(&dev->ep[UDC_EPOUT_IX].ep.ep_list,
1452                                                 &dev->gadget.ep_list);
1453
1454         /* fifo config */
1455         dev->ep[UDC_EPIN_STATUS_IX].fifo_depth = UDC_EPIN_SMALLINT_BUFF_SIZE;
1456         if (dev->gadget.speed == USB_SPEED_FULL)
1457                 dev->ep[UDC_EPIN_IX].fifo_depth = UDC_FS_EPIN_BUFF_SIZE;
1458         else if (dev->gadget.speed == USB_SPEED_HIGH)
1459                 dev->ep[UDC_EPIN_IX].fifo_depth = hs_tx_buf;
1460         dev->ep[UDC_EPOUT_IX].fifo_depth = UDC_RXFIFO_SIZE;
1461 }
1462
1463 /* init registers at driver load time */
1464 static int startup_registers(struct udc *dev)
1465 {
1466         u32 tmp;
1467
1468         /* init controller by soft reset */
1469         udc_soft_reset(dev);
1470
1471         /* mask not needed interrupts */
1472         udc_mask_unused_interrupts(dev);
1473
1474         /* put into initial config */
1475         udc_basic_init(dev);
1476         /* link up all endpoints */
1477         udc_setup_endpoints(dev);
1478
1479         /* program speed */
1480         tmp = readl(&dev->regs->cfg);
1481         if (use_fullspeed) {
1482                 tmp = AMD_ADDBITS(tmp, UDC_DEVCFG_SPD_FS, UDC_DEVCFG_SPD);
1483         } else {
1484                 tmp = AMD_ADDBITS(tmp, UDC_DEVCFG_SPD_HS, UDC_DEVCFG_SPD);
1485         }
1486         writel(tmp, &dev->regs->cfg);
1487
1488         return 0;
1489 }
1490
1491 /* Inits UDC context */
1492 static void udc_basic_init(struct udc *dev)
1493 {
1494         u32     tmp;
1495
1496         DBG(dev, "udc_basic_init()\n");
1497
1498         dev->gadget.speed = USB_SPEED_UNKNOWN;
1499
1500         /* stop RDE timer */
1501         if (timer_pending(&udc_timer)) {
1502                 set_rde = 0;
1503                 mod_timer(&udc_timer, jiffies - 1);
1504         }
1505         /* stop poll stall timer */
1506         if (timer_pending(&udc_pollstall_timer)) {
1507                 mod_timer(&udc_pollstall_timer, jiffies - 1);
1508         }
1509         /* disable DMA */
1510         tmp = readl(&dev->regs->ctl);
1511         tmp &= AMD_UNMASK_BIT(UDC_DEVCTL_RDE);
1512         tmp &= AMD_UNMASK_BIT(UDC_DEVCTL_TDE);
1513         writel(tmp, &dev->regs->ctl);
1514
1515         /* enable dynamic CSR programming */
1516         tmp = readl(&dev->regs->cfg);
1517         tmp |= AMD_BIT(UDC_DEVCFG_CSR_PRG);
1518         /* set self powered */
1519         tmp |= AMD_BIT(UDC_DEVCFG_SP);
1520         /* set remote wakeupable */
1521         tmp |= AMD_BIT(UDC_DEVCFG_RWKP);
1522         writel(tmp, &dev->regs->cfg);
1523
1524         make_ep_lists(dev);
1525
1526         dev->data_ep_enabled = 0;
1527         dev->data_ep_queued = 0;
1528 }
1529
1530 /* Sets initial endpoint parameters */
1531 static void udc_setup_endpoints(struct udc *dev)
1532 {
1533         struct udc_ep   *ep;
1534         u32     tmp;
1535         u32     reg;
1536
1537         DBG(dev, "udc_setup_endpoints()\n");
1538
1539         /* read enum speed */
1540         tmp = readl(&dev->regs->sts);
1541         tmp = AMD_GETBITS(tmp, UDC_DEVSTS_ENUM_SPEED);
1542         if (tmp == UDC_DEVSTS_ENUM_SPEED_HIGH) {
1543                 dev->gadget.speed = USB_SPEED_HIGH;
1544         } else if (tmp == UDC_DEVSTS_ENUM_SPEED_FULL) {
1545                 dev->gadget.speed = USB_SPEED_FULL;
1546         }
1547
1548         /* set basic ep parameters */
1549         for (tmp = 0; tmp < UDC_EP_NUM; tmp++) {
1550                 ep = &dev->ep[tmp];
1551                 ep->dev = dev;
1552                 ep->ep.name = ep_string[tmp];
1553                 ep->num = tmp;
1554                 /* txfifo size is calculated at enable time */
1555                 ep->txfifo = dev->txfifo;
1556
1557                 /* fifo size */
1558                 if (tmp < UDC_EPIN_NUM) {
1559                         ep->fifo_depth = UDC_TXFIFO_SIZE;
1560                         ep->in = 1;
1561                 } else {
1562                         ep->fifo_depth = UDC_RXFIFO_SIZE;
1563                         ep->in = 0;
1564
1565                 }
1566                 ep->regs = &dev->ep_regs[tmp];
1567                 /*
1568                  * ep will be reset only if ep was not enabled before to avoid
1569                  * disabling ep interrupts when ENUM interrupt occurs but ep is
1570                  * not enabled by gadget driver
1571                  */
1572                 if (!ep->desc) {
1573                         ep_init(dev->regs, ep);
1574                 }
1575
1576                 if (use_dma) {
1577                         /*
1578                          * ep->dma is not really used, just to indicate that
1579                          * DMA is active: remove this
1580                          * dma regs = dev control regs
1581                          */
1582                         ep->dma = &dev->regs->ctl;
1583
1584                         /* nak OUT endpoints until enable - not for ep0 */
1585                         if (tmp != UDC_EP0IN_IX && tmp != UDC_EP0OUT_IX
1586                                                 && tmp > UDC_EPIN_NUM) {
1587                                 /* set NAK */
1588                                 reg = readl(&dev->ep[tmp].regs->ctl);
1589                                 reg |= AMD_BIT(UDC_EPCTL_SNAK);
1590                                 writel(reg, &dev->ep[tmp].regs->ctl);
1591                                 dev->ep[tmp].naking = 1;
1592
1593                         }
1594                 }
1595         }
1596         /* EP0 max packet */
1597         if (dev->gadget.speed == USB_SPEED_FULL) {
1598                 dev->ep[UDC_EP0IN_IX].ep.maxpacket = UDC_FS_EP0IN_MAX_PKT_SIZE;
1599                 dev->ep[UDC_EP0OUT_IX].ep.maxpacket =
1600                                                 UDC_FS_EP0OUT_MAX_PKT_SIZE;
1601         } else if (dev->gadget.speed == USB_SPEED_HIGH) {
1602                 dev->ep[UDC_EP0IN_IX].ep.maxpacket = UDC_EP0IN_MAX_PKT_SIZE;
1603                 dev->ep[UDC_EP0OUT_IX].ep.maxpacket = UDC_EP0OUT_MAX_PKT_SIZE;
1604         }
1605
1606         /*
1607          * with suspend bug workaround, ep0 params for gadget driver
1608          * are set at gadget driver bind() call
1609          */
1610         dev->gadget.ep0 = &dev->ep[UDC_EP0IN_IX].ep;
1611         dev->ep[UDC_EP0IN_IX].halted = 0;
1612         INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
1613
1614         /* init cfg/alt/int */
1615         dev->cur_config = 0;
1616         dev->cur_intf = 0;
1617         dev->cur_alt = 0;
1618 }
1619
1620 /* Bringup after Connect event, initial bringup to be ready for ep0 events */
1621 static void usb_connect(struct udc *dev)
1622 {
1623
1624         dev_info(&dev->pdev->dev, "USB Connect\n");
1625
1626         dev->connected = 1;
1627
1628         /* put into initial config */
1629         udc_basic_init(dev);
1630
1631         /* enable device setup interrupts */
1632         udc_enable_dev_setup_interrupts(dev);
1633 }
1634
1635 /*
1636  * Calls gadget with disconnect event and resets the UDC and makes
1637  * initial bringup to be ready for ep0 events
1638  */
1639 static void usb_disconnect(struct udc *dev)
1640 {
1641
1642         dev_info(&dev->pdev->dev, "USB Disconnect\n");
1643
1644         dev->connected = 0;
1645
1646         /* mask interrupts */
1647         udc_mask_unused_interrupts(dev);
1648
1649         /* REVISIT there doesn't seem to be a point to having this
1650          * talk to a tasklet ... do it directly, we already hold
1651          * the spinlock needed to process the disconnect.
1652          */
1653
1654         tasklet_schedule(&disconnect_tasklet);
1655 }
1656
1657 /* Tasklet for disconnect to be outside of interrupt context */
1658 static void udc_tasklet_disconnect(unsigned long par)
1659 {
1660         struct udc *dev = (struct udc *)(*((struct udc **) par));
1661         u32 tmp;
1662
1663         DBG(dev, "Tasklet disconnect\n");
1664         spin_lock_irq(&dev->lock);
1665
1666         if (dev->driver) {
1667                 spin_unlock(&dev->lock);
1668                 dev->driver->disconnect(&dev->gadget);
1669                 spin_lock(&dev->lock);
1670
1671                 /* empty queues */
1672                 for (tmp = 0; tmp < UDC_EP_NUM; tmp++) {
1673                         empty_req_queue(&dev->ep[tmp]);
1674                 }
1675
1676         }
1677
1678         /* disable ep0 */
1679         ep_init(dev->regs,
1680                         &dev->ep[UDC_EP0IN_IX]);
1681
1682
1683         if (!soft_reset_occured) {
1684                 /* init controller by soft reset */
1685                 udc_soft_reset(dev);
1686                 soft_reset_occured++;
1687         }
1688
1689         /* re-enable dev interrupts */
1690         udc_enable_dev_setup_interrupts(dev);
1691         /* back to full speed ? */
1692         if (use_fullspeed) {
1693                 tmp = readl(&dev->regs->cfg);
1694                 tmp = AMD_ADDBITS(tmp, UDC_DEVCFG_SPD_FS, UDC_DEVCFG_SPD);
1695                 writel(tmp, &dev->regs->cfg);
1696         }
1697
1698         spin_unlock_irq(&dev->lock);
1699 }
1700
1701 /* Reset the UDC core */
1702 static void udc_soft_reset(struct udc *dev)
1703 {
1704         unsigned long   flags;
1705
1706         DBG(dev, "Soft reset\n");
1707         /*
1708          * reset possible waiting interrupts, because int.
1709          * status is lost after soft reset,
1710          * ep int. status reset
1711          */
1712         writel(UDC_EPINT_MSK_DISABLE_ALL, &dev->regs->ep_irqsts);
1713         /* device int. status reset */
1714         writel(UDC_DEV_MSK_DISABLE, &dev->regs->irqsts);
1715
1716         spin_lock_irqsave(&udc_irq_spinlock, flags);
1717         writel(AMD_BIT(UDC_DEVCFG_SOFTRESET), &dev->regs->cfg);
1718         readl(&dev->regs->cfg);
1719         spin_unlock_irqrestore(&udc_irq_spinlock, flags);
1720
1721 }
1722
1723 /* RDE timer callback to set RDE bit */
1724 static void udc_timer_function(unsigned long v)
1725 {
1726         u32 tmp;
1727
1728         spin_lock_irq(&udc_irq_spinlock);
1729
1730         if (set_rde > 0) {
1731                 /*
1732                  * open the fifo if fifo was filled on last timer call
1733                  * conditionally
1734                  */
1735                 if (set_rde > 1) {
1736                         /* set RDE to receive setup data */
1737                         tmp = readl(&udc->regs->ctl);
1738                         tmp |= AMD_BIT(UDC_DEVCTL_RDE);
1739                         writel(tmp, &udc->regs->ctl);
1740                         set_rde = -1;
1741                 } else if (readl(&udc->regs->sts)
1742                                 & AMD_BIT(UDC_DEVSTS_RXFIFO_EMPTY)) {
1743                         /*
1744                          * if fifo empty setup polling, do not just
1745                          * open the fifo
1746                          */
1747                         udc_timer.expires = jiffies + HZ/UDC_RDE_TIMER_DIV;
1748                         if (!stop_timer) {
1749                                 add_timer(&udc_timer);
1750                         }
1751                 } else {
1752                         /*
1753                          * fifo contains data now, setup timer for opening
1754                          * the fifo when timer expires to be able to receive
1755                          * setup packets, when data packets gets queued by
1756                          * gadget layer then timer will forced to expire with
1757                          * set_rde=0 (RDE is set in udc_queue())
1758                          */
1759                         set_rde++;
1760                         /* debug: lhadmot_timer_start = 221070 */
1761                         udc_timer.expires = jiffies + HZ*UDC_RDE_TIMER_SECONDS;
1762                         if (!stop_timer) {
1763                                 add_timer(&udc_timer);
1764                         }
1765                 }
1766
1767         } else
1768                 set_rde = -1; /* RDE was set by udc_queue() */
1769         spin_unlock_irq(&udc_irq_spinlock);
1770         if (stop_timer)
1771                 complete(&on_exit);
1772
1773 }
1774
1775 /* Handle halt state, used in stall poll timer */
1776 static void udc_handle_halt_state(struct udc_ep *ep)
1777 {
1778         u32 tmp;
1779         /* set stall as long not halted */
1780         if (ep->halted == 1) {
1781                 tmp = readl(&ep->regs->ctl);
1782                 /* STALL cleared ? */
1783                 if (!(tmp & AMD_BIT(UDC_EPCTL_S))) {
1784                         /*
1785                          * FIXME: MSC spec requires that stall remains
1786                          * even on receivng of CLEAR_FEATURE HALT. So
1787                          * we would set STALL again here to be compliant.
1788                          * But with current mass storage drivers this does
1789                          * not work (would produce endless host retries).
1790                          * So we clear halt on CLEAR_FEATURE.
1791                          *
1792                         DBG(ep->dev, "ep %d: set STALL again\n", ep->num);
1793                         tmp |= AMD_BIT(UDC_EPCTL_S);
1794                         writel(tmp, &ep->regs->ctl);*/
1795
1796                         /* clear NAK by writing CNAK */
1797                         tmp |= AMD_BIT(UDC_EPCTL_CNAK);
1798                         writel(tmp, &ep->regs->ctl);
1799                         ep->halted = 0;
1800                         UDC_QUEUE_CNAK(ep, ep->num);
1801                 }
1802         }
1803 }
1804
1805 /* Stall timer callback to poll S bit and set it again after */
1806 static void udc_pollstall_timer_function(unsigned long v)
1807 {
1808         struct udc_ep *ep;
1809         int halted = 0;
1810
1811         spin_lock_irq(&udc_stall_spinlock);
1812         /*
1813          * only one IN and OUT endpoints are handled
1814          * IN poll stall
1815          */
1816         ep = &udc->ep[UDC_EPIN_IX];
1817         udc_handle_halt_state(ep);
1818         if (ep->halted)
1819                 halted = 1;
1820         /* OUT poll stall */
1821         ep = &udc->ep[UDC_EPOUT_IX];
1822         udc_handle_halt_state(ep);
1823         if (ep->halted)
1824                 halted = 1;
1825
1826         /* setup timer again when still halted */
1827         if (!stop_pollstall_timer && halted) {
1828                 udc_pollstall_timer.expires = jiffies +
1829                                         HZ * UDC_POLLSTALL_TIMER_USECONDS
1830                                         / (1000 * 1000);
1831                 add_timer(&udc_pollstall_timer);
1832         }
1833         spin_unlock_irq(&udc_stall_spinlock);
1834
1835         if (stop_pollstall_timer)
1836                 complete(&on_pollstall_exit);
1837 }
1838
1839 /* Inits endpoint 0 so that SETUP packets are processed */
1840 static void activate_control_endpoints(struct udc *dev)
1841 {
1842         u32 tmp;
1843
1844         DBG(dev, "activate_control_endpoints\n");
1845
1846         /* flush fifo */
1847         tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
1848         tmp |= AMD_BIT(UDC_EPCTL_F);
1849         writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
1850
1851         /* set ep0 directions */
1852         dev->ep[UDC_EP0IN_IX].in = 1;
1853         dev->ep[UDC_EP0OUT_IX].in = 0;
1854
1855         /* set buffer size (tx fifo entries) of EP0_IN */
1856         tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->bufin_framenum);
1857         if (dev->gadget.speed == USB_SPEED_FULL)
1858                 tmp = AMD_ADDBITS(tmp, UDC_FS_EPIN0_BUFF_SIZE,
1859                                         UDC_EPIN_BUFF_SIZE);
1860         else if (dev->gadget.speed == USB_SPEED_HIGH)
1861                 tmp = AMD_ADDBITS(tmp, UDC_EPIN0_BUFF_SIZE,
1862                                         UDC_EPIN_BUFF_SIZE);
1863         writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->bufin_framenum);
1864
1865         /* set max packet size of EP0_IN */
1866         tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->bufout_maxpkt);
1867         if (dev->gadget.speed == USB_SPEED_FULL)
1868                 tmp = AMD_ADDBITS(tmp, UDC_FS_EP0IN_MAX_PKT_SIZE,
1869                                         UDC_EP_MAX_PKT_SIZE);
1870         else if (dev->gadget.speed == USB_SPEED_HIGH)
1871                 tmp = AMD_ADDBITS(tmp, UDC_EP0IN_MAX_PKT_SIZE,
1872                                 UDC_EP_MAX_PKT_SIZE);
1873         writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->bufout_maxpkt);
1874
1875         /* set max packet size of EP0_OUT */
1876         tmp = readl(&dev->ep[UDC_EP0OUT_IX].regs->bufout_maxpkt);
1877         if (dev->gadget.speed == USB_SPEED_FULL)
1878                 tmp = AMD_ADDBITS(tmp, UDC_FS_EP0OUT_MAX_PKT_SIZE,
1879                                         UDC_EP_MAX_PKT_SIZE);
1880         else if (dev->gadget.speed == USB_SPEED_HIGH)
1881                 tmp = AMD_ADDBITS(tmp, UDC_EP0OUT_MAX_PKT_SIZE,
1882                                         UDC_EP_MAX_PKT_SIZE);
1883         writel(tmp, &dev->ep[UDC_EP0OUT_IX].regs->bufout_maxpkt);
1884
1885         /* set max packet size of EP0 in UDC CSR */
1886         tmp = readl(&dev->csr->ne[0]);
1887         if (dev->gadget.speed == USB_SPEED_FULL)
1888                 tmp = AMD_ADDBITS(tmp, UDC_FS_EP0OUT_MAX_PKT_SIZE,
1889                                         UDC_CSR_NE_MAX_PKT);
1890         else if (dev->gadget.speed == USB_SPEED_HIGH)
1891                 tmp = AMD_ADDBITS(tmp, UDC_EP0OUT_MAX_PKT_SIZE,
1892                                         UDC_CSR_NE_MAX_PKT);
1893         writel(tmp, &dev->csr->ne[0]);
1894
1895         if (use_dma) {
1896                 dev->ep[UDC_EP0OUT_IX].td->status |=
1897                         AMD_BIT(UDC_DMA_OUT_STS_L);
1898                 /* write dma desc address */
1899                 writel(dev->ep[UDC_EP0OUT_IX].td_stp_dma,
1900                         &dev->ep[UDC_EP0OUT_IX].regs->subptr);
1901                 writel(dev->ep[UDC_EP0OUT_IX].td_phys,
1902                         &dev->ep[UDC_EP0OUT_IX].regs->desptr);
1903                 /* stop RDE timer */
1904                 if (timer_pending(&udc_timer)) {
1905                         set_rde = 0;
1906                         mod_timer(&udc_timer, jiffies - 1);
1907                 }
1908                 /* stop pollstall timer */
1909                 if (timer_pending(&udc_pollstall_timer)) {
1910                         mod_timer(&udc_pollstall_timer, jiffies - 1);
1911                 }
1912                 /* enable DMA */
1913                 tmp = readl(&dev->regs->ctl);
1914                 tmp |= AMD_BIT(UDC_DEVCTL_MODE)
1915                                 | AMD_BIT(UDC_DEVCTL_RDE)
1916                                 | AMD_BIT(UDC_DEVCTL_TDE);
1917                 if (use_dma_bufferfill_mode) {
1918                         tmp |= AMD_BIT(UDC_DEVCTL_BF);
1919                 } else if (use_dma_ppb_du) {
1920                         tmp |= AMD_BIT(UDC_DEVCTL_DU);
1921                 }
1922                 writel(tmp, &dev->regs->ctl);
1923         }
1924
1925         /* clear NAK by writing CNAK for EP0IN */
1926         tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
1927         tmp |= AMD_BIT(UDC_EPCTL_CNAK);
1928         writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
1929         dev->ep[UDC_EP0IN_IX].naking = 0;
1930         UDC_QUEUE_CNAK(&dev->ep[UDC_EP0IN_IX], UDC_EP0IN_IX);
1931
1932         /* clear NAK by writing CNAK for EP0OUT */
1933         tmp = readl(&dev->ep[UDC_EP0OUT_IX].regs->ctl);
1934         tmp |= AMD_BIT(UDC_EPCTL_CNAK);
1935         writel(tmp, &dev->ep[UDC_EP0OUT_IX].regs->ctl);
1936         dev->ep[UDC_EP0OUT_IX].naking = 0;
1937         UDC_QUEUE_CNAK(&dev->ep[UDC_EP0OUT_IX], UDC_EP0OUT_IX);
1938 }
1939
1940 /* Make endpoint 0 ready for control traffic */
1941 static int setup_ep0(struct udc *dev)
1942 {
1943         activate_control_endpoints(dev);
1944         /* enable ep0 interrupts */
1945         udc_enable_ep0_interrupts(dev);
1946         /* enable device setup interrupts */
1947         udc_enable_dev_setup_interrupts(dev);
1948
1949         return 0;
1950 }
1951
1952 /* Called by gadget driver to register itself */
1953 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
1954 {
1955         struct udc              *dev = udc;
1956         int                     retval;
1957         u32 tmp;
1958
1959         if (!driver || !driver->bind || !driver->setup
1960                         || driver->speed != USB_SPEED_HIGH)
1961                 return -EINVAL;
1962         if (!dev)
1963                 return -ENODEV;
1964         if (dev->driver)
1965                 return -EBUSY;
1966
1967         driver->driver.bus = NULL;
1968         dev->driver = driver;
1969         dev->gadget.dev.driver = &driver->driver;
1970
1971         retval = driver->bind(&dev->gadget);
1972
1973         /* Some gadget drivers use both ep0 directions.
1974          * NOTE: to gadget driver, ep0 is just one endpoint...
1975          */
1976         dev->ep[UDC_EP0OUT_IX].ep.driver_data =
1977                 dev->ep[UDC_EP0IN_IX].ep.driver_data;
1978
1979         if (retval) {
1980                 DBG(dev, "binding to %s returning %d\n",
1981                                 driver->driver.name, retval);
1982                 dev->driver = NULL;
1983                 dev->gadget.dev.driver = NULL;
1984                 return retval;
1985         }
1986
1987         /* get ready for ep0 traffic */
1988         setup_ep0(dev);
1989
1990         /* clear SD */
1991         tmp = readl(&dev->regs->ctl);
1992         tmp = tmp & AMD_CLEAR_BIT(UDC_DEVCTL_SD);
1993         writel(tmp, &dev->regs->ctl);
1994
1995         usb_connect(dev);
1996
1997         return 0;
1998 }
1999 EXPORT_SYMBOL(usb_gadget_register_driver);
2000
2001 /* shutdown requests and disconnect from gadget */
2002 static void
2003 shutdown(struct udc *dev, struct usb_gadget_driver *driver)
2004 __releases(dev->lock)
2005 __acquires(dev->lock)
2006 {
2007         int tmp;
2008
2009         /* empty queues and init hardware */
2010         udc_basic_init(dev);
2011         for (tmp = 0; tmp < UDC_EP_NUM; tmp++) {
2012                 empty_req_queue(&dev->ep[tmp]);
2013         }
2014
2015         if (dev->gadget.speed != USB_SPEED_UNKNOWN) {
2016                 spin_unlock(&dev->lock);
2017                 driver->disconnect(&dev->gadget);
2018                 spin_lock(&dev->lock);
2019         }
2020         /* init */
2021         udc_setup_endpoints(dev);
2022 }
2023
2024 /* Called by gadget driver to unregister itself */
2025 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
2026 {
2027         struct udc      *dev = udc;
2028         unsigned long   flags;
2029         u32 tmp;
2030
2031         if (!dev)
2032                 return -ENODEV;
2033         if (!driver || driver != dev->driver || !driver->unbind)
2034                 return -EINVAL;
2035
2036         spin_lock_irqsave(&dev->lock, flags);
2037         udc_mask_unused_interrupts(dev);
2038         shutdown(dev, driver);
2039         spin_unlock_irqrestore(&dev->lock, flags);
2040
2041         driver->unbind(&dev->gadget);
2042         dev->gadget.dev.driver = NULL;
2043         dev->driver = NULL;
2044
2045         /* set SD */
2046         tmp = readl(&dev->regs->ctl);
2047         tmp |= AMD_BIT(UDC_DEVCTL_SD);
2048         writel(tmp, &dev->regs->ctl);
2049
2050
2051         DBG(dev, "%s: unregistered\n", driver->driver.name);
2052
2053         return 0;
2054 }
2055 EXPORT_SYMBOL(usb_gadget_unregister_driver);
2056
2057
2058 /* Clear pending NAK bits */
2059 static void udc_process_cnak_queue(struct udc *dev)
2060 {
2061         u32 tmp;
2062         u32 reg;
2063
2064         /* check epin's */
2065         DBG(dev, "CNAK pending queue processing\n");
2066         for (tmp = 0; tmp < UDC_EPIN_NUM_USED; tmp++) {
2067                 if (cnak_pending & (1 << tmp)) {
2068                         DBG(dev, "CNAK pending for ep%d\n", tmp);
2069                         /* clear NAK by writing CNAK */
2070                         reg = readl(&dev->ep[tmp].regs->ctl);
2071                         reg |= AMD_BIT(UDC_EPCTL_CNAK);
2072                         writel(reg, &dev->ep[tmp].regs->ctl);
2073                         dev->ep[tmp].naking = 0;
2074                         UDC_QUEUE_CNAK(&dev->ep[tmp], dev->ep[tmp].num);
2075                 }
2076         }
2077         /* ...  and ep0out */
2078         if (cnak_pending & (1 << UDC_EP0OUT_IX)) {
2079                 DBG(dev, "CNAK pending for ep%d\n", UDC_EP0OUT_IX);
2080                 /* clear NAK by writing CNAK */
2081                 reg = readl(&dev->ep[UDC_EP0OUT_IX].regs->ctl);
2082                 reg |= AMD_BIT(UDC_EPCTL_CNAK);
2083                 writel(reg, &dev->ep[UDC_EP0OUT_IX].regs->ctl);
2084                 dev->ep[UDC_EP0OUT_IX].naking = 0;
2085                 UDC_QUEUE_CNAK(&dev->ep[UDC_EP0OUT_IX],
2086                                 dev->ep[UDC_EP0OUT_IX].num);
2087         }
2088 }
2089
2090 /* Enabling RX DMA after setup packet */
2091 static void udc_ep0_set_rde(struct udc *dev)
2092 {
2093         if (use_dma) {
2094                 /*
2095                  * only enable RXDMA when no data endpoint enabled
2096                  * or data is queued
2097                  */
2098                 if (!dev->data_ep_enabled || dev->data_ep_queued) {
2099                         udc_set_rde(dev);
2100                 } else {
2101                         /*
2102                          * setup timer for enabling RDE (to not enable
2103                          * RXFIFO DMA for data endpoints to early)
2104                          */
2105                         if (set_rde != 0 && !timer_pending(&udc_timer)) {
2106                                 udc_timer.expires =
2107                                         jiffies + HZ/UDC_RDE_TIMER_DIV;
2108                                 set_rde = 1;
2109                                 if (!stop_timer) {
2110                                         add_timer(&udc_timer);
2111                                 }
2112                         }
2113                 }
2114         }
2115 }
2116
2117
2118 /* Interrupt handler for data OUT traffic */
2119 static irqreturn_t udc_data_out_isr(struct udc *dev, int ep_ix)
2120 {
2121         irqreturn_t             ret_val = IRQ_NONE;
2122         u32                     tmp;
2123         struct udc_ep           *ep;
2124         struct udc_request      *req;
2125         unsigned int            count;
2126         struct udc_data_dma     *td = NULL;
2127         unsigned                dma_done;
2128
2129         VDBG(dev, "ep%d irq\n", ep_ix);
2130         ep = &dev->ep[ep_ix];
2131
2132         tmp = readl(&ep->regs->sts);
2133         if (use_dma) {
2134                 /* BNA event ? */
2135                 if (tmp & AMD_BIT(UDC_EPSTS_BNA)) {
2136                         DBG(dev, "BNA ep%dout occured - DESPTR = %x \n",
2137                                         ep->num, readl(&ep->regs->desptr));
2138                         /* clear BNA */
2139                         writel(tmp | AMD_BIT(UDC_EPSTS_BNA), &ep->regs->sts);
2140                         if (!ep->cancel_transfer)
2141                                 ep->bna_occurred = 1;
2142                         else
2143                                 ep->cancel_transfer = 0;
2144                         ret_val = IRQ_HANDLED;
2145                         goto finished;
2146                 }
2147         }
2148         /* HE event ? */
2149         if (tmp & AMD_BIT(UDC_EPSTS_HE)) {
2150                 dev_err(&dev->pdev->dev, "HE ep%dout occured\n", ep->num);
2151
2152                 /* clear HE */
2153                 writel(tmp | AMD_BIT(UDC_EPSTS_HE), &ep->regs->sts);
2154                 ret_val = IRQ_HANDLED;
2155                 goto finished;
2156         }
2157
2158         if (!list_empty(&ep->queue)) {
2159
2160                 /* next request */
2161                 req = list_entry(ep->queue.next,
2162                         struct udc_request, queue);
2163         } else {
2164                 req = NULL;
2165                 udc_rxfifo_pending = 1;
2166         }
2167         VDBG(dev, "req = %p\n", req);
2168         /* fifo mode */
2169         if (!use_dma) {
2170
2171                 /* read fifo */
2172                 if (req && udc_rxfifo_read(ep, req)) {
2173                         ret_val = IRQ_HANDLED;
2174
2175                         /* finish */
2176                         complete_req(ep, req, 0);
2177                         /* next request */
2178                         if (!list_empty(&ep->queue) && !ep->halted) {
2179                                 req = list_entry(ep->queue.next,
2180                                         struct udc_request, queue);
2181                         } else
2182                                 req = NULL;
2183                 }
2184
2185         /* DMA */
2186         } else if (!ep->cancel_transfer && req != NULL) {
2187                 ret_val = IRQ_HANDLED;
2188
2189                 /* check for DMA done */
2190                 if (!use_dma_ppb) {
2191                         dma_done = AMD_GETBITS(req->td_data->status,
2192                                                 UDC_DMA_OUT_STS_BS);
2193                 /* packet per buffer mode - rx bytes */
2194                 } else {
2195                         /*
2196                          * if BNA occurred then recover desc. from
2197                          * BNA dummy desc.
2198                          */
2199                         if (ep->bna_occurred) {
2200                                 VDBG(dev, "Recover desc. from BNA dummy\n");
2201                                 memcpy(req->td_data, ep->bna_dummy_req->td_data,
2202                                                 sizeof(struct udc_data_dma));
2203                                 ep->bna_occurred = 0;
2204                                 udc_init_bna_dummy(ep->req);
2205                         }
2206                         td = udc_get_last_dma_desc(req);
2207                         dma_done = AMD_GETBITS(td->status, UDC_DMA_OUT_STS_BS);
2208                 }
2209                 if (dma_done == UDC_DMA_OUT_STS_BS_DMA_DONE) {
2210                         /* buffer fill mode - rx bytes */
2211                         if (!use_dma_ppb) {
2212                                 /* received number bytes */
2213                                 count = AMD_GETBITS(req->td_data->status,
2214                                                 UDC_DMA_OUT_STS_RXBYTES);
2215                                 VDBG(dev, "rx bytes=%u\n", count);
2216                         /* packet per buffer mode - rx bytes */
2217                         } else {
2218                                 VDBG(dev, "req->td_data=%p\n", req->td_data);
2219                                 VDBG(dev, "last desc = %p\n", td);
2220                                 /* received number bytes */
2221                                 if (use_dma_ppb_du) {
2222                                         /* every desc. counts bytes */
2223                                         count = udc_get_ppbdu_rxbytes(req);
2224                                 } else {
2225                                         /* last desc. counts bytes */
2226                                         count = AMD_GETBITS(td->status,
2227                                                 UDC_DMA_OUT_STS_RXBYTES);
2228                                         if (!count && req->req.length
2229                                                 == UDC_DMA_MAXPACKET) {
2230                                                 /*
2231                                                  * on 64k packets the RXBYTES
2232                                                  * field is zero
2233                                                  */
2234                                                 count = UDC_DMA_MAXPACKET;
2235                                         }
2236                                 }
2237                                 VDBG(dev, "last desc rx bytes=%u\n", count);
2238                         }
2239
2240                         tmp = req->req.length - req->req.actual;
2241                         if (count > tmp) {
2242                                 if ((tmp % ep->ep.maxpacket) != 0) {
2243                                         DBG(dev, "%s: rx %db, space=%db\n",
2244                                                 ep->ep.name, count, tmp);
2245                                         req->req.status = -EOVERFLOW;
2246                                 }
2247                                 count = tmp;
2248                         }
2249                         req->req.actual += count;
2250                         req->dma_going = 0;
2251                         /* complete request */
2252                         complete_req(ep, req, 0);
2253
2254                         /* next request */
2255                         if (!list_empty(&ep->queue) && !ep->halted) {
2256                                 req = list_entry(ep->queue.next,
2257                                         struct udc_request,
2258                                         queue);
2259                                 /*
2260                                  * DMA may be already started by udc_queue()
2261                                  * called by gadget drivers completion
2262                                  * routine. This happens when queue
2263                                  * holds one request only.
2264                                  */
2265                                 if (req->dma_going == 0) {
2266                                         /* next dma */
2267                                         if (prep_dma(ep, req, GFP_ATOMIC) != 0)
2268                                                 goto finished;
2269                                         /* write desc pointer */
2270                                         writel(req->td_phys,
2271                                                 &ep->regs->desptr);
2272                                         req->dma_going = 1;
2273                                         /* enable DMA */
2274                                         udc_set_rde(dev);
2275                                 }
2276                         } else {
2277                                 /*
2278                                  * implant BNA dummy descriptor to allow
2279                                  * RXFIFO opening by RDE
2280                                  */
2281                                 if (ep->bna_dummy_req) {
2282                                         /* write desc pointer */
2283                                         writel(ep->bna_dummy_req->td_phys,
2284                                                 &ep->regs->desptr);
2285                                         ep->bna_occurred = 0;
2286                                 }
2287
2288                                 /*
2289                                  * schedule timer for setting RDE if queue
2290                                  * remains empty to allow ep0 packets pass
2291                                  * through
2292                                  */
2293                                 if (set_rde != 0
2294                                                 && !timer_pending(&udc_timer)) {
2295                                         udc_timer.expires =
2296                                                 jiffies
2297                                                 + HZ*UDC_RDE_TIMER_SECONDS;
2298                                         set_rde = 1;
2299                                         if (!stop_timer) {
2300                                                 add_timer(&udc_timer);
2301                                         }
2302                                 }
2303                                 if (ep->num != UDC_EP0OUT_IX)
2304                                         dev->data_ep_queued = 0;
2305                         }
2306
2307                 } else {
2308                         /*
2309                         * RX DMA must be reenabled for each desc in PPBDU mode
2310                         * and must be enabled for PPBNDU mode in case of BNA
2311                         */
2312                         udc_set_rde(dev);
2313                 }
2314
2315         } else if (ep->cancel_transfer) {
2316                 ret_val = IRQ_HANDLED;
2317                 ep->cancel_transfer = 0;
2318         }
2319
2320         /* check pending CNAKS */
2321         if (cnak_pending) {
2322                 /* CNAk processing when rxfifo empty only */
2323                 if (readl(&dev->regs->sts) & AMD_BIT(UDC_DEVSTS_RXFIFO_EMPTY)) {
2324                         udc_process_cnak_queue(dev);
2325                 }
2326         }
2327
2328         /* clear OUT bits in ep status */
2329         writel(UDC_EPSTS_OUT_CLEAR, &ep->regs->sts);
2330 finished:
2331         return ret_val;
2332 }
2333
2334 /* Interrupt handler for data IN traffic */
2335 static irqreturn_t udc_data_in_isr(struct udc *dev, int ep_ix)
2336 {
2337         irqreturn_t ret_val = IRQ_NONE;
2338         u32 tmp;
2339         u32 epsts;
2340         struct udc_ep *ep;
2341         struct udc_request *req;
2342         struct udc_data_dma *td;
2343         unsigned dma_done;
2344         unsigned len;
2345
2346         ep = &dev->ep[ep_ix];
2347
2348         epsts = readl(&ep->regs->sts);
2349         if (use_dma) {
2350                 /* BNA ? */
2351                 if (epsts & AMD_BIT(UDC_EPSTS_BNA)) {
2352                         dev_err(&dev->pdev->dev,
2353                                 "BNA ep%din occured - DESPTR = %08lx \n",
2354                                 ep->num,
2355                                 (unsigned long) readl(&ep->regs->desptr));
2356
2357                         /* clear BNA */
2358                         writel(epsts, &ep->regs->sts);
2359                         ret_val = IRQ_HANDLED;
2360                         goto finished;
2361                 }
2362         }
2363         /* HE event ? */
2364         if (epsts & AMD_BIT(UDC_EPSTS_HE)) {
2365                 dev_err(&dev->pdev->dev,
2366                         "HE ep%dn occured - DESPTR = %08lx \n",
2367                         ep->num, (unsigned long) readl(&ep->regs->desptr));
2368
2369                 /* clear HE */
2370                 writel(epsts | AMD_BIT(UDC_EPSTS_HE), &ep->regs->sts);
2371                 ret_val = IRQ_HANDLED;
2372                 goto finished;
2373         }
2374
2375         /* DMA completion */
2376         if (epsts & AMD_BIT(UDC_EPSTS_TDC)) {
2377                 VDBG(dev, "TDC set- completion\n");
2378                 ret_val = IRQ_HANDLED;
2379                 if (!ep->cancel_transfer && !list_empty(&ep->queue)) {
2380                         req = list_entry(ep->queue.next,
2381                                         struct udc_request, queue);
2382                         if (req) {
2383                                 /*
2384                                  * length bytes transfered
2385                                  * check dma done of last desc. in PPBDU mode
2386                                  */
2387                                 if (use_dma_ppb_du) {
2388                                         td = udc_get_last_dma_desc(req);
2389                                         if (td) {
2390                                                 dma_done =
2391                                                         AMD_GETBITS(td->status,
2392                                                         UDC_DMA_IN_STS_BS);
2393                                                 /* don't care DMA done */
2394                                                 req->req.actual =
2395                                                         req->req.length;
2396                                         }
2397                                 } else {
2398                                         /* assume all bytes transferred */
2399                                         req->req.actual = req->req.length;
2400                                 }
2401
2402                                 if (req->req.actual == req->req.length) {
2403                                         /* complete req */
2404                                         complete_req(ep, req, 0);
2405                                         req->dma_going = 0;
2406                                         /* further request available ? */
2407                                         if (list_empty(&ep->queue)) {
2408                                                 /* disable interrupt */
2409                                                 tmp = readl(
2410                                                         &dev->regs->ep_irqmsk);
2411                                                 tmp |= AMD_BIT(ep->num);
2412                                                 writel(tmp,
2413                                                         &dev->regs->ep_irqmsk);
2414                                         }
2415
2416                                 }
2417                         }
2418                 }
2419                 ep->cancel_transfer = 0;
2420
2421         }
2422         /*
2423          * status reg has IN bit set and TDC not set (if TDC was handled,
2424          * IN must not be handled (UDC defect) ?
2425          */
2426         if ((epsts & AMD_BIT(UDC_EPSTS_IN))
2427                         && !(epsts & AMD_BIT(UDC_EPSTS_TDC))) {
2428                 ret_val = IRQ_HANDLED;
2429                 if (!list_empty(&ep->queue)) {
2430                         /* next request */
2431                         req = list_entry(ep->queue.next,
2432                                         struct udc_request, queue);
2433                         /* FIFO mode */
2434                         if (!use_dma) {
2435                                 /* write fifo */
2436                                 udc_txfifo_write(ep, &req->req);
2437                                 len = req->req.length - req->req.actual;
2438                                                 if (len > ep->ep.maxpacket)
2439                                                         len = ep->ep.maxpacket;
2440                                                 req->req.actual += len;
2441                                 if (req->req.actual == req->req.length
2442                                         || (len != ep->ep.maxpacket)) {
2443                                         /* complete req */
2444                                         complete_req(ep, req, 0);
2445                                 }
2446                         /* DMA */
2447                         } else if (req && !req->dma_going) {
2448                                 VDBG(dev, "IN DMA : req=%p req->td_data=%p\n",
2449                                         req, req->td_data);
2450                                 if (req->td_data) {
2451
2452                                         req->dma_going = 1;
2453
2454                                         /*
2455                                          * unset L bit of first desc.
2456                                          * for chain
2457                                          */
2458                                         if (use_dma_ppb && req->req.length >
2459                                                         ep->ep.maxpacket) {
2460                                                 req->td_data->status &=
2461                                                         AMD_CLEAR_BIT(
2462                                                         UDC_DMA_IN_STS_L);
2463                                         }
2464
2465                                         /* write desc pointer */
2466                                         writel(req->td_phys, &ep->regs->desptr);
2467
2468                                         /* set HOST READY */
2469                                         req->td_data->status =
2470                                                 AMD_ADDBITS(
2471                                                 req->td_data->status,
2472                                                 UDC_DMA_IN_STS_BS_HOST_READY,
2473                                                 UDC_DMA_IN_STS_BS);
2474
2475                                         /* set poll demand bit */
2476                                         tmp = readl(&ep->regs->ctl);
2477                                         tmp |= AMD_BIT(UDC_EPCTL_P);
2478                                         writel(tmp, &ep->regs->ctl);
2479                                 }
2480                         }
2481
2482                 }
2483         }
2484         /* clear status bits */
2485         writel(epsts, &ep->regs->sts);
2486
2487 finished:
2488         return ret_val;
2489
2490 }
2491
2492 /* Interrupt handler for Control OUT traffic */
2493 static irqreturn_t udc_control_out_isr(struct udc *dev)
2494 __releases(dev->lock)
2495 __acquires(dev->lock)
2496 {
2497         irqreturn_t ret_val = IRQ_NONE;
2498         u32 tmp;
2499         int setup_supported;
2500         u32 count;
2501         int set = 0;
2502         struct udc_ep   *ep;
2503         struct udc_ep   *ep_tmp;
2504
2505         ep = &dev->ep[UDC_EP0OUT_IX];
2506
2507         /* clear irq */
2508         writel(AMD_BIT(UDC_EPINT_OUT_EP0), &dev->regs->ep_irqsts);
2509
2510         tmp = readl(&dev->ep[UDC_EP0OUT_IX].regs->sts);
2511         /* check BNA and clear if set */
2512         if (tmp & AMD_BIT(UDC_EPSTS_BNA)) {
2513                 VDBG(dev, "ep0: BNA set\n");
2514                 writel(AMD_BIT(UDC_EPSTS_BNA),
2515                         &dev->ep[UDC_EP0OUT_IX].regs->sts);
2516                 ep->bna_occurred = 1;
2517                 ret_val = IRQ_HANDLED;
2518                 goto finished;
2519         }
2520
2521         /* type of data: SETUP or DATA 0 bytes */
2522         tmp = AMD_GETBITS(tmp, UDC_EPSTS_OUT);
2523         VDBG(dev, "data_typ = %x\n", tmp);
2524
2525         /* setup data */
2526         if (tmp == UDC_EPSTS_OUT_SETUP) {
2527                 ret_val = IRQ_HANDLED;
2528
2529                 ep->dev->stall_ep0in = 0;
2530                 dev->waiting_zlp_ack_ep0in = 0;
2531
2532                 /* set NAK for EP0_IN */
2533                 tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
2534                 tmp |= AMD_BIT(UDC_EPCTL_SNAK);
2535                 writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
2536                 dev->ep[UDC_EP0IN_IX].naking = 1;
2537                 /* get setup data */
2538                 if (use_dma) {
2539
2540                         /* clear OUT bits in ep status */
2541                         writel(UDC_EPSTS_OUT_CLEAR,
2542                                 &dev->ep[UDC_EP0OUT_IX].regs->sts);
2543
2544                         setup_data.data[0] =
2545                                 dev->ep[UDC_EP0OUT_IX].td_stp->data12;
2546                         setup_data.data[1] =
2547                                 dev->ep[UDC_EP0OUT_IX].td_stp->data34;
2548                         /* set HOST READY */
2549                         dev->ep[UDC_EP0OUT_IX].td_stp->status =
2550                                         UDC_DMA_STP_STS_BS_HOST_READY;
2551                 } else {
2552                         /* read fifo */
2553                         udc_rxfifo_read_dwords(dev, setup_data.data, 2);
2554                 }
2555
2556                 /* determine direction of control data */
2557                 if ((setup_data.request.bRequestType & USB_DIR_IN) != 0) {
2558                         dev->gadget.ep0 = &dev->ep[UDC_EP0IN_IX].ep;
2559                         /* enable RDE */
2560                         udc_ep0_set_rde(dev);
2561                         set = 0;
2562                 } else {
2563                         dev->gadget.ep0 = &dev->ep[UDC_EP0OUT_IX].ep;
2564                         /*
2565                          * implant BNA dummy descriptor to allow RXFIFO opening
2566                          * by RDE
2567                          */
2568                         if (ep->bna_dummy_req) {
2569                                 /* write desc pointer */
2570                                 writel(ep->bna_dummy_req->td_phys,
2571                                         &dev->ep[UDC_EP0OUT_IX].regs->desptr);
2572                                 ep->bna_occurred = 0;
2573                         }
2574
2575                         set = 1;
2576                         dev->ep[UDC_EP0OUT_IX].naking = 1;
2577                         /*
2578                          * setup timer for enabling RDE (to not enable
2579                          * RXFIFO DMA for data to early)
2580                          */
2581                         set_rde = 1;
2582                         if (!timer_pending(&udc_timer)) {
2583                                 udc_timer.expires = jiffies +
2584                                                         HZ/UDC_RDE_TIMER_DIV;
2585                                 if (!stop_timer) {
2586                                         add_timer(&udc_timer);
2587                                 }
2588                         }
2589                 }
2590
2591                 /*
2592                  * mass storage reset must be processed here because
2593                  * next packet may be a CLEAR_FEATURE HALT which would not
2594                  * clear the stall bit when no STALL handshake was received
2595                  * before (autostall can cause this)
2596                  */
2597                 if (setup_data.data[0] == UDC_MSCRES_DWORD0
2598                                 && setup_data.data[1] == UDC_MSCRES_DWORD1) {
2599                         DBG(dev, "MSC Reset\n");
2600                         /*
2601                          * clear stall bits
2602                          * only one IN and OUT endpoints are handled
2603                          */
2604                         ep_tmp = &udc->ep[UDC_EPIN_IX];
2605                         udc_set_halt(&ep_tmp->ep, 0);
2606                         ep_tmp = &udc->ep[UDC_EPOUT_IX];
2607                         udc_set_halt(&ep_tmp->ep, 0);
2608                 }
2609
2610                 /* call gadget with setup data received */
2611                 spin_unlock(&dev->lock);
2612                 setup_supported = dev->driver->setup(&dev->gadget,
2613                                                 &setup_data.request);
2614                 spin_lock(&dev->lock);
2615
2616                 tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
2617                 /* ep0 in returns data (not zlp) on IN phase */
2618                 if (setup_supported >= 0 && setup_supported <
2619                                 UDC_EP0IN_MAXPACKET) {
2620                         /* clear NAK by writing CNAK in EP0_IN */
2621                         tmp |= AMD_BIT(UDC_EPCTL_CNAK);
2622                         writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
2623                         dev->ep[UDC_EP0IN_IX].naking = 0;
2624                         UDC_QUEUE_CNAK(&dev->ep[UDC_EP0IN_IX], UDC_EP0IN_IX);
2625
2626                 /* if unsupported request then stall */
2627                 } else if (setup_supported < 0) {
2628                         tmp |= AMD_BIT(UDC_EPCTL_S);
2629                         writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
2630                 } else
2631                         dev->waiting_zlp_ack_ep0in = 1;
2632
2633
2634                 /* clear NAK by writing CNAK in EP0_OUT */
2635                 if (!set) {
2636                         tmp = readl(&dev->ep[UDC_EP0OUT_IX].regs->ctl);
2637                         tmp |= AMD_BIT(UDC_EPCTL_CNAK);
2638                         writel(tmp, &dev->ep[UDC_EP0OUT_IX].regs->ctl);
2639                         dev->ep[UDC_EP0OUT_IX].naking = 0;
2640                         UDC_QUEUE_CNAK(&dev->ep[UDC_EP0OUT_IX], UDC_EP0OUT_IX);
2641                 }
2642
2643                 if (!use_dma) {
2644                         /* clear OUT bits in ep status */
2645                         writel(UDC_EPSTS_OUT_CLEAR,
2646                                 &dev->ep[UDC_EP0OUT_IX].regs->sts);
2647                 }
2648
2649         /* data packet 0 bytes */
2650         } else if (tmp == UDC_EPSTS_OUT_DATA) {
2651                 /* clear OUT bits in ep status */
2652                 writel(UDC_EPSTS_OUT_CLEAR, &dev->ep[UDC_EP0OUT_IX].regs->sts);
2653
2654                 /* get setup data: only 0 packet */
2655                 if (use_dma) {
2656                         /* no req if 0 packet, just reactivate */
2657                         if (list_empty(&dev->ep[UDC_EP0OUT_IX].queue)) {
2658                                 VDBG(dev, "ZLP\n");
2659
2660                                 /* set HOST READY */
2661                                 dev->ep[UDC_EP0OUT_IX].td->status =
2662                                         AMD_ADDBITS(
2663                                         dev->ep[UDC_EP0OUT_IX].td->status,
2664                                         UDC_DMA_OUT_STS_BS_HOST_READY,
2665                                         UDC_DMA_OUT_STS_BS);
2666                                 /* enable RDE */
2667                                 udc_ep0_set_rde(dev);
2668                                 ret_val = IRQ_HANDLED;
2669
2670                         } else {
2671                                 /* control write */
2672                                 ret_val |= udc_data_out_isr(dev, UDC_EP0OUT_IX);
2673                                 /* re-program desc. pointer for possible ZLPs */
2674                                 writel(dev->ep[UDC_EP0OUT_IX].td_phys,
2675                                         &dev->ep[UDC_EP0OUT_IX].regs->desptr);
2676                                 /* enable RDE */
2677                                 udc_ep0_set_rde(dev);
2678                         }
2679                 } else {
2680
2681                         /* received number bytes */
2682                         count = readl(&dev->ep[UDC_EP0OUT_IX].regs->sts);
2683                         count = AMD_GETBITS(count, UDC_EPSTS_RX_PKT_SIZE);
2684                         /* out data for fifo mode not working */
2685                         count = 0;
2686
2687                         /* 0 packet or real data ? */
2688                         if (count != 0) {
2689                                 ret_val |= udc_data_out_isr(dev, UDC_EP0OUT_IX);
2690                         } else {
2691                                 /* dummy read confirm */
2692                                 readl(&dev->ep[UDC_EP0OUT_IX].regs->confirm);
2693                                 ret_val = IRQ_HANDLED;
2694                         }
2695                 }
2696         }
2697
2698         /* check pending CNAKS */
2699         if (cnak_pending) {
2700                 /* CNAk processing when rxfifo empty only */
2701                 if (readl(&dev->regs->sts) & AMD_BIT(UDC_DEVSTS_RXFIFO_EMPTY)) {
2702                         udc_process_cnak_queue(dev);
2703                 }
2704         }
2705
2706 finished:
2707         return ret_val;
2708 }
2709
2710 /* Interrupt handler for Control IN traffic */
2711 static irqreturn_t udc_control_in_isr(struct udc *dev)
2712 {
2713         irqreturn_t ret_val = IRQ_NONE;
2714         u32 tmp;
2715         struct udc_ep *ep;
2716         struct udc_request *req;
2717         unsigned len;
2718
2719         ep = &dev->ep[UDC_EP0IN_IX];
2720
2721         /* clear irq */
2722         writel(AMD_BIT(UDC_EPINT_IN_EP0), &dev->regs->ep_irqsts);
2723
2724         tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->sts);
2725         /* DMA completion */
2726         if (tmp & AMD_BIT(UDC_EPSTS_TDC)) {
2727                 VDBG(dev, "isr: TDC clear \n");
2728                 ret_val = IRQ_HANDLED;
2729
2730                 /* clear TDC bit */
2731                 writel(AMD_BIT(UDC_EPSTS_TDC),
2732                                 &dev->ep[UDC_EP0IN_IX].regs->sts);
2733
2734         /* status reg has IN bit set ? */
2735         } else if (tmp & AMD_BIT(UDC_EPSTS_IN)) {
2736                 ret_val = IRQ_HANDLED;
2737
2738                 if (ep->dma) {
2739                         /* clear IN bit */
2740                         writel(AMD_BIT(UDC_EPSTS_IN),
2741                                 &dev->ep[UDC_EP0IN_IX].regs->sts);
2742                 }
2743                 if (dev->stall_ep0in) {
2744                         DBG(dev, "stall ep0in\n");
2745                         /* halt ep0in */
2746                         tmp = readl(&ep->regs->ctl);
2747                         tmp |= AMD_BIT(UDC_EPCTL_S);
2748                         writel(tmp, &ep->regs->ctl);
2749                 } else {
2750                         if (!list_empty(&ep->queue)) {
2751                                 /* next request */
2752                                 req = list_entry(ep->queue.next,
2753                                                 struct udc_request, queue);
2754
2755                                 if (ep->dma) {
2756                                         /* write desc pointer */
2757                                         writel(req->td_phys, &ep->regs->desptr);
2758                                         /* set HOST READY */
2759                                         req->td_data->status =
2760                                                 AMD_ADDBITS(
2761                                                 req->td_data->status,
2762                                                 UDC_DMA_STP_STS_BS_HOST_READY,
2763                                                 UDC_DMA_STP_STS_BS);
2764
2765                                         /* set poll demand bit */
2766                                         tmp =
2767                                         readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
2768                                         tmp |= AMD_BIT(UDC_EPCTL_P);
2769                                         writel(tmp,
2770                                         &dev->ep[UDC_EP0IN_IX].regs->ctl);
2771
2772                                         /* all bytes will be transferred */
2773                                         req->req.actual = req->req.length;
2774
2775                                         /* complete req */
2776                                         complete_req(ep, req, 0);
2777
2778                                 } else {
2779                                         /* write fifo */
2780                                         udc_txfifo_write(ep, &req->req);
2781
2782                                         /* lengh bytes transfered */
2783                                         len = req->req.length - req->req.actual;
2784                                         if (len > ep->ep.maxpacket)
2785                                                 len = ep->ep.maxpacket;
2786
2787                                         req->req.actual += len;
2788                                         if (req->req.actual == req->req.length
2789                                                 || (len != ep->ep.maxpacket)) {
2790                                                 /* complete req */
2791                                                 complete_req(ep, req, 0);
2792                                         }
2793                                 }
2794
2795                         }
2796                 }
2797                 ep->halted = 0;
2798                 dev->stall_ep0in = 0;
2799                 if (!ep->dma) {
2800                         /* clear IN bit */
2801                         writel(AMD_BIT(UDC_EPSTS_IN),
2802                                 &dev->ep[UDC_EP0IN_IX].regs->sts);
2803                 }
2804         }
2805
2806         return ret_val;
2807 }
2808
2809
2810 /* Interrupt handler for global device events */
2811 static irqreturn_t udc_dev_isr(struct udc *dev, u32 dev_irq)
2812 __releases(dev->lock)
2813 __acquires(dev->lock)
2814 {
2815         irqreturn_t ret_val = IRQ_NONE;
2816         u32 tmp;
2817         u32 cfg;
2818         struct udc_ep *ep;
2819         u16 i;
2820         u8 udc_csr_epix;
2821
2822         /* SET_CONFIG irq ? */
2823         if (dev_irq & AMD_BIT(UDC_DEVINT_SC)) {
2824                 ret_val = IRQ_HANDLED;
2825
2826                 /* read config value */
2827                 tmp = readl(&dev->regs->sts);
2828                 cfg = AMD_GETBITS(tmp, UDC_DEVSTS_CFG);
2829                 DBG(dev, "SET_CONFIG interrupt: config=%d\n", cfg);
2830                 dev->cur_config = cfg;
2831                 dev->set_cfg_not_acked = 1;
2832
2833                 /* make usb request for gadget driver */
2834                 memset(&setup_data, 0 , sizeof(union udc_setup_data));
2835                 setup_data.request.bRequest = USB_REQ_SET_CONFIGURATION;
2836                 setup_data.request.wValue = cpu_to_le16(dev->cur_config);
2837
2838                 /* programm the NE registers */
2839                 for (i = 0; i < UDC_EP_NUM; i++) {
2840                         ep = &dev->ep[i];
2841                         if (ep->in) {
2842
2843                                 /* ep ix in UDC CSR register space */
2844                                 udc_csr_epix = ep->num;
2845
2846
2847                         /* OUT ep */
2848                         } else {
2849                                 /* ep ix in UDC CSR register space */
2850                                 udc_csr_epix = ep->num - UDC_CSR_EP_OUT_IX_OFS;
2851                         }
2852
2853                         tmp = readl(&dev->csr->ne[udc_csr_epix]);
2854                         /* ep cfg */
2855                         tmp = AMD_ADDBITS(tmp, ep->dev->cur_config,
2856                                                 UDC_CSR_NE_CFG);
2857                         /* write reg */
2858                         writel(tmp, &dev->csr->ne[udc_csr_epix]);
2859
2860                         /* clear stall bits */
2861                         ep->halted = 0;
2862                         tmp = readl(&ep->regs->ctl);
2863                         tmp = tmp & AMD_CLEAR_BIT(UDC_EPCTL_S);
2864                         writel(tmp, &ep->regs->ctl);
2865                 }
2866                 /* call gadget zero with setup data received */
2867                 spin_unlock(&dev->lock);
2868                 tmp = dev->driver->setup(&dev->gadget, &setup_data.request);
2869                 spin_lock(&dev->lock);
2870
2871         } /* SET_INTERFACE ? */
2872         if (dev_irq & AMD_BIT(UDC_DEVINT_SI)) {
2873                 ret_val = IRQ_HANDLED;
2874
2875                 dev->set_cfg_not_acked = 1;
2876                 /* read interface and alt setting values */
2877                 tmp = readl(&dev->regs->sts);
2878                 dev->cur_alt = AMD_GETBITS(tmp, UDC_DEVSTS_ALT);
2879                 dev->cur_intf = AMD_GETBITS(tmp, UDC_DEVSTS_INTF);
2880
2881                 /* make usb request for gadget driver */
2882                 memset(&setup_data, 0 , sizeof(union udc_setup_data));
2883                 setup_data.request.bRequest = USB_REQ_SET_INTERFACE;
2884                 setup_data.request.bRequestType = USB_RECIP_INTERFACE;
2885                 setup_data.request.wValue = cpu_to_le16(dev->cur_alt);
2886                 setup_data.request.wIndex = cpu_to_le16(dev->cur_intf);
2887
2888                 DBG(dev, "SET_INTERFACE interrupt: alt=%d intf=%d\n",
2889                                 dev->cur_alt, dev->cur_intf);
2890
2891                 /* programm the NE registers */
2892                 for (i = 0; i < UDC_EP_NUM; i++) {
2893                         ep = &dev->ep[i];
2894                         if (ep->in) {
2895
2896                                 /* ep ix in UDC CSR register space */
2897                                 udc_csr_epix = ep->num;
2898
2899
2900                         /* OUT ep */
2901                         } else {
2902                                 /* ep ix in UDC CSR register space */
2903                                 udc_csr_epix = ep->num - UDC_CSR_EP_OUT_IX_OFS;
2904                         }
2905
2906                         /* UDC CSR reg */
2907                         /* set ep values */
2908                         tmp = readl(&dev->csr->ne[udc_csr_epix]);
2909                         /* ep interface */
2910                         tmp = AMD_ADDBITS(tmp, ep->dev->cur_intf,
2911                                                 UDC_CSR_NE_INTF);
2912                         /* tmp = AMD_ADDBITS(tmp, 2, UDC_CSR_NE_INTF); */
2913                         /* ep alt */
2914                         tmp = AMD_ADDBITS(tmp, ep->dev->cur_alt,
2915                                                 UDC_CSR_NE_ALT);
2916                         /* write reg */
2917                         writel(tmp, &dev->csr->ne[udc_csr_epix]);
2918
2919                         /* clear stall bits */
2920                         ep->halted = 0;
2921                         tmp = readl(&ep->regs->ctl);
2922                         tmp = tmp & AMD_CLEAR_BIT(UDC_EPCTL_S);
2923                         writel(tmp, &ep->regs->ctl);
2924                 }
2925
2926                 /* call gadget zero with setup data received */
2927                 spin_unlock(&dev->lock);
2928                 tmp = dev->driver->setup(&dev->gadget, &setup_data.request);
2929                 spin_lock(&dev->lock);
2930
2931         } /* USB reset */
2932         if (dev_irq & AMD_BIT(UDC_DEVINT_UR)) {
2933                 DBG(dev, "USB Reset interrupt\n");
2934                 ret_val = IRQ_HANDLED;
2935
2936                 /* allow soft reset when suspend occurs */
2937                 soft_reset_occured = 0;
2938
2939                 dev->waiting_zlp_ack_ep0in = 0;
2940                 dev->set_cfg_not_acked = 0;
2941
2942                 /* mask not needed interrupts */
2943                 udc_mask_unused_interrupts(dev);
2944
2945                 /* call gadget to resume and reset configs etc. */
2946                 spin_unlock(&dev->lock);
2947                 if (dev->sys_suspended && dev->driver->resume) {
2948                         dev->driver->resume(&dev->gadget);
2949                         dev->sys_suspended = 0;
2950                 }
2951                 dev->driver->disconnect(&dev->gadget);
2952                 spin_lock(&dev->lock);
2953
2954                 /* disable ep0 to empty req queue */
2955                 empty_req_queue(&dev->ep[UDC_EP0IN_IX]);
2956                 ep_init(dev->regs, &dev->ep[UDC_EP0IN_IX]);
2957
2958                 /* soft reset when rxfifo not empty */
2959                 tmp = readl(&dev->regs->sts);
2960                 if (!(tmp & AMD_BIT(UDC_DEVSTS_RXFIFO_EMPTY))
2961                                 && !soft_reset_after_usbreset_occured) {
2962                         udc_soft_reset(dev);
2963                         soft_reset_after_usbreset_occured++;
2964                 }
2965
2966                 /*
2967                  * DMA reset to kill potential old DMA hw hang,
2968                  * POLL bit is already reset by ep_init() through
2969                  * disconnect()
2970                  */
2971                 DBG(dev, "DMA machine reset\n");
2972                 tmp = readl(&dev->regs->cfg);
2973                 writel(tmp | AMD_BIT(UDC_DEVCFG_DMARST), &dev->regs->cfg);
2974                 writel(tmp, &dev->regs->cfg);
2975
2976                 /* put into initial config */
2977                 udc_basic_init(dev);
2978
2979                 /* enable device setup interrupts */
2980                 udc_enable_dev_setup_interrupts(dev);
2981
2982                 /* enable suspend interrupt */
2983                 tmp = readl(&dev->regs->irqmsk);
2984                 tmp &= AMD_UNMASK_BIT(UDC_DEVINT_US);
2985                 writel(tmp, &dev->regs->irqmsk);
2986
2987         } /* USB suspend */
2988         if (dev_irq & AMD_BIT(UDC_DEVINT_US)) {
2989                 DBG(dev, "USB Suspend interrupt\n");
2990                 ret_val = IRQ_HANDLED;
2991                 if (dev->driver->suspend) {
2992                         spin_unlock(&dev->lock);
2993                         dev->sys_suspended = 1;
2994                         dev->driver->suspend(&dev->gadget);
2995                         spin_lock(&dev->lock);
2996                 }
2997         } /* new speed ? */
2998         if (dev_irq & AMD_BIT(UDC_DEVINT_ENUM)) {
2999                 DBG(dev, "ENUM interrupt\n");
3000                 ret_val = IRQ_HANDLED;
3001                 soft_reset_after_usbreset_occured = 0;
3002
3003                 /* disable ep0 to empty req queue */
3004                 empty_req_queue(&dev->ep[UDC_EP0IN_IX]);
3005                 ep_init(dev->regs, &dev->ep[UDC_EP0IN_IX]);
3006
3007                 /* link up all endpoints */
3008                 udc_setup_endpoints(dev);
3009                 if (dev->gadget.speed == USB_SPEED_HIGH) {
3010                         dev_info(&dev->pdev->dev, "Connect: speed = %s\n",
3011                                 "high");
3012                 } else if (dev->gadget.speed == USB_SPEED_FULL) {
3013                         dev_info(&dev->pdev->dev, "Connect: speed = %s\n",
3014                                 "full");
3015                 }
3016
3017                 /* init ep 0 */
3018                 activate_control_endpoints(dev);
3019
3020                 /* enable ep0 interrupts */
3021                 udc_enable_ep0_interrupts(dev);
3022         }
3023         /* session valid change interrupt */
3024         if (dev_irq & AMD_BIT(UDC_DEVINT_SVC)) {
3025                 DBG(dev, "USB SVC interrupt\n");
3026                 ret_val = IRQ_HANDLED;
3027
3028                 /* check that session is not valid to detect disconnect */
3029                 tmp = readl(&dev->regs->sts);
3030                 if (!(tmp & AMD_BIT(UDC_DEVSTS_SESSVLD))) {
3031                         /* disable suspend interrupt */
3032                         tmp = readl(&dev->regs->irqmsk);
3033                         tmp |= AMD_BIT(UDC_DEVINT_US);
3034                         writel(tmp, &dev->regs->irqmsk);
3035                         DBG(dev, "USB Disconnect (session valid low)\n");
3036                         /* cleanup on disconnect */
3037                         usb_disconnect(udc);
3038                 }
3039
3040         }
3041
3042         return ret_val;
3043 }
3044
3045 /* Interrupt Service Routine, see Linux Kernel Doc for parameters */
3046 static irqreturn_t udc_irq(int irq, void *pdev)
3047 {
3048         struct udc *dev = pdev;
3049         u32 reg;
3050         u16 i;
3051         u32 ep_irq;
3052         irqreturn_t ret_val = IRQ_NONE;
3053
3054         spin_lock(&dev->lock);
3055
3056         /* check for ep irq */
3057         reg = readl(&dev->regs->ep_irqsts);
3058         if (reg) {
3059                 if (reg & AMD_BIT(UDC_EPINT_OUT_EP0))
3060                         ret_val |= udc_control_out_isr(dev);
3061                 if (reg & AMD_BIT(UDC_EPINT_IN_EP0))
3062                         ret_val |= udc_control_in_isr(dev);
3063
3064                 /*
3065                  * data endpoint
3066                  * iterate ep's
3067                  */
3068                 for (i = 1; i < UDC_EP_NUM; i++) {
3069                         ep_irq = 1 << i;
3070                         if (!(reg & ep_irq) || i == UDC_EPINT_OUT_EP0)
3071                                 continue;
3072
3073                         /* clear irq status */
3074                         writel(ep_irq, &dev->regs->ep_irqsts);
3075
3076                         /* irq for out ep ? */
3077                         if (i > UDC_EPIN_NUM)
3078                                 ret_val |= udc_data_out_isr(dev, i);
3079                         else
3080                                 ret_val |= udc_data_in_isr(dev, i);
3081                 }
3082
3083         }
3084
3085
3086         /* check for dev irq */
3087         reg = readl(&dev->regs->irqsts);
3088         if (reg) {
3089                 /* clear irq */
3090                 writel(reg, &dev->regs->irqsts);
3091                 ret_val |= udc_dev_isr(dev, reg);
3092         }
3093
3094
3095         spin_unlock(&dev->lock);
3096         return ret_val;
3097 }
3098
3099 /* Tears down device */
3100 static void gadget_release(struct device *pdev)
3101 {
3102         struct amd5536udc *dev = dev_get_drvdata(pdev);
3103         kfree(dev);
3104 }
3105
3106 /* Cleanup on device remove */
3107 static void udc_remove(struct udc *dev)
3108 {
3109         /* remove timer */
3110         stop_timer++;
3111         if (timer_pending(&udc_timer))
3112                 wait_for_completion(&on_exit);
3113         if (udc_timer.data)
3114                 del_timer_sync(&udc_timer);
3115         /* remove pollstall timer */
3116         stop_pollstall_timer++;
3117         if (timer_pending(&udc_pollstall_timer))
3118                 wait_for_completion(&on_pollstall_exit);
3119         if (udc_pollstall_timer.data)
3120                 del_timer_sync(&udc_pollstall_timer);
3121         udc = NULL;
3122 }
3123
3124 /* Reset all pci context */
3125 static void udc_pci_remove(struct pci_dev *pdev)
3126 {
3127         struct udc              *dev;
3128
3129         dev = pci_get_drvdata(pdev);
3130
3131         /* gadget driver must not be registered */
3132         BUG_ON(dev->driver != NULL);
3133
3134         /* dma pool cleanup */
3135         if (dev->data_requests)
3136                 pci_pool_destroy(dev->data_requests);
3137
3138         if (dev->stp_requests) {
3139                 /* cleanup DMA desc's for ep0in */
3140                 pci_pool_free(dev->stp_requests,
3141                         dev->ep[UDC_EP0OUT_IX].td_stp,
3142                         dev->ep[UDC_EP0OUT_IX].td_stp_dma);
3143                 pci_pool_free(dev->stp_requests,
3144                         dev->ep[UDC_EP0OUT_IX].td,
3145                         dev->ep[UDC_EP0OUT_IX].td_phys);
3146
3147                 pci_pool_destroy(dev->stp_requests);
3148         }
3149
3150         /* reset controller */
3151         writel(AMD_BIT(UDC_DEVCFG_SOFTRESET), &dev->regs->cfg);
3152         if (dev->irq_registered)
3153                 free_irq(pdev->irq, dev);
3154         if (dev->regs)
3155                 iounmap(dev->regs);
3156         if (dev->mem_region)
3157                 release_mem_region(pci_resource_start(pdev, 0),
3158                                 pci_resource_len(pdev, 0));
3159         if (dev->active)
3160                 pci_disable_device(pdev);
3161
3162         device_unregister(&dev->gadget.dev);
3163         pci_set_drvdata(pdev, NULL);
3164
3165         udc_remove(dev);
3166 }
3167
3168 /* create dma pools on init */
3169 static int init_dma_pools(struct udc *dev)
3170 {
3171         struct udc_stp_dma      *td_stp;
3172         struct udc_data_dma     *td_data;
3173         int retval;
3174
3175         /* consistent DMA mode setting ? */
3176         if (use_dma_ppb) {
3177                 use_dma_bufferfill_mode = 0;
3178         } else {
3179                 use_dma_ppb_du = 0;
3180                 use_dma_bufferfill_mode = 1;
3181         }
3182
3183         /* DMA setup */
3184         dev->data_requests = dma_pool_create("data_requests", NULL,
3185                 sizeof(struct udc_data_dma), 0, 0);
3186         if (!dev->data_requests) {
3187                 DBG(dev, "can't get request data pool\n");
3188                 retval = -ENOMEM;
3189                 goto finished;
3190         }
3191
3192         /* EP0 in dma regs = dev control regs */
3193         dev->ep[UDC_EP0IN_IX].dma = &dev->regs->ctl;
3194
3195         /* dma desc for setup data */
3196         dev->stp_requests = dma_pool_create("setup requests", NULL,
3197                 sizeof(struct udc_stp_dma), 0, 0);
3198         if (!dev->stp_requests) {
3199                 DBG(dev, "can't get stp request pool\n");
3200                 retval = -ENOMEM;
3201                 goto finished;
3202         }
3203         /* setup */
3204         td_stp = dma_pool_alloc(dev->stp_requests, GFP_KERNEL,
3205                                 &dev->ep[UDC_EP0OUT_IX].td_stp_dma);
3206         if (td_stp == NULL) {
3207                 retval = -ENOMEM;
3208                 goto finished;
3209         }
3210         dev->ep[UDC_EP0OUT_IX].td_stp = td_stp;
3211
3212         /* data: 0 packets !? */
3213         td_data = dma_pool_alloc(dev->stp_requests, GFP_KERNEL,
3214                                 &dev->ep[UDC_EP0OUT_IX].td_phys);
3215         if (td_data == NULL) {
3216                 retval = -ENOMEM;
3217                 goto finished;
3218         }
3219         dev->ep[UDC_EP0OUT_IX].td = td_data;
3220         return 0;
3221
3222 finished:
3223         return retval;
3224 }
3225
3226 /* Called by pci bus driver to init pci context */
3227 static int udc_pci_probe(
3228         struct pci_dev *pdev,
3229         const struct pci_device_id *id
3230 )
3231 {
3232         struct udc              *dev;
3233         unsigned long           resource;
3234         unsigned long           len;
3235         int                     retval = 0;
3236
3237         /* one udc only */
3238         if (udc) {
3239                 dev_dbg(&pdev->dev, "already probed\n");
3240                 return -EBUSY;
3241         }
3242
3243         /* init */
3244         dev = kzalloc(sizeof(struct udc), GFP_KERNEL);
3245         if (!dev) {
3246                 retval = -ENOMEM;
3247                 goto finished;
3248         }
3249
3250         /* pci setup */
3251         if (pci_enable_device(pdev) < 0) {
3252                 kfree(dev);
3253                 dev = NULL;
3254                 retval = -ENODEV;
3255                 goto finished;
3256         }
3257         dev->active = 1;
3258
3259         /* PCI resource allocation */
3260         resource = pci_resource_start(pdev, 0);
3261         len = pci_resource_len(pdev, 0);
3262
3263         if (!request_mem_region(resource, len, name)) {
3264                 dev_dbg(&pdev->dev, "pci device used already\n");
3265                 kfree(dev);
3266                 dev = NULL;
3267                 retval = -EBUSY;
3268                 goto finished;
3269         }
3270         dev->mem_region = 1;
3271
3272         dev->virt_addr = ioremap_nocache(resource, len);
3273         if (dev->virt_addr == NULL) {
3274                 dev_dbg(&pdev->dev, "start address cannot be mapped\n");
3275                 kfree(dev);
3276                 dev = NULL;
3277                 retval = -EFAULT;
3278                 goto finished;
3279         }
3280
3281         if (!pdev->irq) {
3282                 dev_err(&dev->pdev->dev, "irq not set\n");
3283                 kfree(dev);
3284                 dev = NULL;
3285                 retval = -ENODEV;
3286                 goto finished;
3287         }
3288
3289         if (request_irq(pdev->irq, udc_irq, IRQF_SHARED, name, dev) != 0) {
3290                 dev_dbg(&dev->pdev->dev, "request_irq(%d) fail\n", pdev->irq);
3291                 kfree(dev);
3292                 dev = NULL;
3293                 retval = -EBUSY;
3294                 goto finished;
3295         }
3296         dev->irq_registered = 1;
3297
3298         pci_set_drvdata(pdev, dev);
3299
3300         /* chip revision for Hs AMD5536 */
3301         dev->chiprev = pdev->revision;
3302
3303         pci_set_master(pdev);
3304         pci_try_set_mwi(pdev);
3305
3306         /* init dma pools */
3307         if (use_dma) {
3308                 retval = init_dma_pools(dev);
3309                 if (retval != 0)
3310                         goto finished;
3311         }
3312
3313         dev->phys_addr = resource;
3314         dev->irq = pdev->irq;
3315         dev->pdev = pdev;
3316         dev->gadget.dev.parent = &pdev->dev;
3317         dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
3318
3319         /* general probing */
3320         if (udc_probe(dev) == 0)
3321                 return 0;
3322
3323 finished:
3324         if (dev)
3325                 udc_pci_remove(pdev);
3326         return retval;
3327 }
3328
3329 /* general probe */
3330 static int udc_probe(struct udc *dev)
3331 {
3332         char            tmp[128];
3333         u32             reg;
3334         int             retval;
3335
3336         /* mark timer as not initialized */
3337         udc_timer.data = 0;
3338         udc_pollstall_timer.data = 0;
3339
3340         /* device struct setup */
3341         spin_lock_init(&dev->lock);
3342         dev->gadget.ops = &udc_ops;
3343
3344         dev_set_name(&dev->gadget.dev, "gadget");
3345         dev->gadget.dev.release = gadget_release;
3346         dev->gadget.name = name;
3347         dev->gadget.name = name;
3348         dev->gadget.is_dualspeed = 1;
3349
3350         /* udc csr registers base */
3351         dev->csr = dev->virt_addr + UDC_CSR_ADDR;
3352         /* dev registers base */
3353         dev->regs = dev->virt_addr + UDC_DEVCFG_ADDR;
3354         /* ep registers base */
3355         dev->ep_regs = dev->virt_addr + UDC_EPREGS_ADDR;
3356         /* fifo's base */
3357         dev->rxfifo = (u32 __iomem *)(dev->virt_addr + UDC_RXFIFO_ADDR);
3358         dev->txfifo = (u32 __iomem *)(dev->virt_addr + UDC_TXFIFO_ADDR);
3359
3360         /* init registers, interrupts, ... */
3361         startup_registers(dev);
3362
3363         dev_info(&dev->pdev->dev, "%s\n", mod_desc);
3364
3365         snprintf(tmp, sizeof tmp, "%d", dev->irq);
3366         dev_info(&dev->pdev->dev,
3367                 "irq %s, pci mem %08lx, chip rev %02x(Geode5536 %s)\n",
3368                 tmp, dev->phys_addr, dev->chiprev,
3369                 (dev->chiprev == UDC_HSA0_REV) ? "A0" : "B1");
3370         strcpy(tmp, UDC_DRIVER_VERSION_STRING);
3371         if (dev->chiprev == UDC_HSA0_REV) {
3372                 dev_err(&dev->pdev->dev, "chip revision is A0; too old\n");
3373                 retval = -ENODEV;
3374                 goto finished;
3375         }
3376         dev_info(&dev->pdev->dev,
3377                 "driver version: %s(for Geode5536 B1)\n", tmp);
3378         udc = dev;
3379
3380         retval = device_register(&dev->gadget.dev);
3381         if (retval)
3382                 goto finished;
3383
3384         /* timer init */
3385         init_timer(&udc_timer);
3386         udc_timer.function = udc_timer_function;
3387         udc_timer.data = 1;
3388         /* timer pollstall init */
3389         init_timer(&udc_pollstall_timer);
3390         udc_pollstall_timer.function = udc_pollstall_timer_function;
3391         udc_pollstall_timer.data = 1;
3392
3393         /* set SD */
3394         reg = readl(&dev->regs->ctl);
3395         reg |= AMD_BIT(UDC_DEVCTL_SD);
3396         writel(reg, &dev->regs->ctl);
3397
3398         /* print dev register info */
3399         print_regs(dev);
3400
3401         return 0;
3402
3403 finished:
3404         return retval;
3405 }
3406
3407 /* Initiates a remote wakeup */
3408 static int udc_remote_wakeup(struct udc *dev)
3409 {
3410         unsigned long flags;
3411         u32 tmp;
3412
3413         DBG(dev, "UDC initiates remote wakeup\n");
3414
3415         spin_lock_irqsave(&dev->lock, flags);
3416
3417         tmp = readl(&dev->regs->ctl);
3418         tmp |= AMD_BIT(UDC_DEVCTL_RES);
3419         writel(tmp, &dev->regs->ctl);
3420         tmp &= AMD_CLEAR_BIT(UDC_DEVCTL_RES);
3421         writel(tmp, &dev->regs->ctl);
3422
3423         spin_unlock_irqrestore(&dev->lock, flags);
3424         return 0;
3425 }
3426
3427 /* PCI device parameters */
3428 static const struct pci_device_id pci_id[] = {
3429         {
3430                 PCI_DEVICE(PCI_VENDOR_ID_AMD, 0x2096),
3431                 .class =        (PCI_CLASS_SERIAL_USB << 8) | 0xfe,
3432                 .class_mask =   0xffffffff,
3433         },
3434         {},
3435 };
3436 MODULE_DEVICE_TABLE(pci, pci_id);
3437
3438 /* PCI functions */
3439 static struct pci_driver udc_pci_driver = {
3440         .name =         (char *) name,
3441         .id_table =     pci_id,
3442         .probe =        udc_pci_probe,
3443         .remove =       udc_pci_remove,
3444 };
3445
3446 /* Inits driver */
3447 static int __init init(void)
3448 {
3449         return pci_register_driver(&udc_pci_driver);
3450 }
3451 module_init(init);
3452
3453 /* Cleans driver */
3454 static void __exit cleanup(void)
3455 {
3456         pci_unregister_driver(&udc_pci_driver);
3457 }
3458 module_exit(cleanup);
3459
3460 MODULE_DESCRIPTION(UDC_MOD_DESCRIPTION);
3461 MODULE_AUTHOR("Thomas Dahlmann");
3462 MODULE_LICENSE("GPL");
3463