git.oblomov.eu Git - linux-2.6/blob - drivers/staging/poch/poch.c

   1 /*
   2  * User-space DMA and UIO based Redrapids Pocket Change CardBus driver
   3  *
   4  * Copyright 2008 Vijay Kumar <vijaykumar@bravegnu.org>
   5  *
   6  * Licensed under GPL version 2 only.
   7  */
   8
   9 #include <linux/device.h>
  10 #include <linux/module.h>
  11 #include <linux/pci.h>
  12 #include <linux/uio_driver.h>
  13 #include <linux/spinlock.h>
  14 #include <linux/cdev.h>
  15 #include <linux/delay.h>
  16 #include <linux/sysfs.h>
  17 #include <linux/poll.h>
  18 #include <linux/idr.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/init.h>
  21 #include <linux/ioctl.h>
  22 #include <linux/io.h>
  23
  24 #include "poch.h"
  25
  26 #include <asm/cacheflush.h>
  27
  28 #ifndef PCI_VENDOR_ID_RRAPIDS
  29 #define PCI_VENDOR_ID_RRAPIDS 0x17D2
  30 #endif
  31
  32 #ifndef PCI_DEVICE_ID_RRAPIDS_POCKET_CHANGE
  33 #define PCI_DEVICE_ID_RRAPIDS_POCKET_CHANGE 0x0351
  34 #endif
  35
  36 #define POCH_NCHANNELS 2
  37
  38 #define MAX_POCH_CARDS 8
  39 #define MAX_POCH_DEVICES (MAX_POCH_CARDS * POCH_NCHANNELS)
  40
  41 #define DRV_NAME "poch"
  42 #define PFX      DRV_NAME ": "
  43
  44 /*
  45  * BAR0 Bridge Register Definitions
  46  */
  47
  48 #define BRIDGE_REV_REG                  0x0
  49 #define BRIDGE_INT_MASK_REG             0x4
  50 #define BRIDGE_INT_STAT_REG             0x8
  51
  52 #define BRIDGE_INT_ACTIVE               (0x1 << 31)
  53 #define BRIDGE_INT_FPGA                 (0x1 << 2)
  54 #define BRIDGE_INT_TEMP_FAIL            (0x1 << 1)
  55 #define BRIDGE_INT_TEMP_WARN            (0x1 << 0)
  56
  57 #define BRIDGE_FPGA_RESET_REG           0xC
  58
  59 #define BRIDGE_CARD_POWER_REG           0x10
  60 #define BRIDGE_CARD_POWER_EN            (0x1 << 0)
  61 #define BRIDGE_CARD_POWER_PROG_DONE     (0x1 << 31)
  62
  63 #define BRIDGE_JTAG_REG                 0x14
  64 #define BRIDGE_DMA_GO_REG               0x18
  65 #define BRIDGE_STAT_0_REG               0x1C
  66 #define BRIDGE_STAT_1_REG               0x20
  67 #define BRIDGE_STAT_2_REG               0x24
  68 #define BRIDGE_STAT_3_REG               0x28
  69 #define BRIDGE_TEMP_STAT_REG            0x2C
  70 #define BRIDGE_TEMP_THRESH_REG          0x30
  71 #define BRIDGE_EEPROM_REVSEL_REG        0x34
  72 #define BRIDGE_CIS_STRUCT_REG           0x100
  73 #define BRIDGE_BOARDREV_REG             0x124
  74
  75 /*
  76  * BAR1 FPGA Register Definitions
  77  */
  78
  79 #define FPGA_IFACE_REV_REG              0x0
  80 #define FPGA_RX_BLOCK_SIZE_REG          0x8
  81 #define FPGA_TX_BLOCK_SIZE_REG          0xC
  82 #define FPGA_RX_BLOCK_COUNT_REG         0x10
  83 #define FPGA_TX_BLOCK_COUNT_REG         0x14
  84 #define FPGA_RX_CURR_DMA_BLOCK_REG      0x18
  85 #define FPGA_TX_CURR_DMA_BLOCK_REG      0x1C
  86 #define FPGA_RX_GROUP_COUNT_REG         0x20
  87 #define FPGA_TX_GROUP_COUNT_REG         0x24
  88 #define FPGA_RX_CURR_GROUP_REG          0x28
  89 #define FPGA_TX_CURR_GROUP_REG          0x2C
  90 #define FPGA_RX_CURR_PCI_REG            0x38
  91 #define FPGA_TX_CURR_PCI_REG            0x3C
  92 #define FPGA_RX_GROUP0_START_REG        0x40
  93 #define FPGA_TX_GROUP0_START_REG        0xC0
  94 #define FPGA_DMA_DESC_1_REG             0x140
  95 #define FPGA_DMA_DESC_2_REG             0x144
  96 #define FPGA_DMA_DESC_3_REG             0x148
  97 #define FPGA_DMA_DESC_4_REG             0x14C
  98
  99 #define FPGA_DMA_INT_STAT_REG           0x150
 100 #define FPGA_DMA_INT_MASK_REG           0x154
 101 #define FPGA_DMA_INT_RX         (1 << 0)
 102 #define FPGA_DMA_INT_TX         (1 << 1)
 103
 104 #define FPGA_RX_GROUPS_PER_INT_REG      0x158
 105 #define FPGA_TX_GROUPS_PER_INT_REG      0x15C
 106 #define FPGA_DMA_ADR_PAGE_REG           0x160
 107 #define FPGA_FPGA_REV_REG               0x200
 108
 109 #define FPGA_ADC_CLOCK_CTL_REG          0x204
 110 #define FPGA_ADC_CLOCK_CTL_OSC_EN       (0x1 << 3)
 111 #define FPGA_ADC_CLOCK_LOCAL_CLK        (0x1 | FPGA_ADC_CLOCK_CTL_OSC_EN)
 112 #define FPGA_ADC_CLOCK_EXT_SAMP_CLK     0X0
 113
 114 #define FPGA_ADC_DAC_EN_REG             0x208
 115 #define FPGA_ADC_DAC_EN_DAC_OFF         (0x1 << 1)
 116 #define FPGA_ADC_DAC_EN_ADC_OFF         (0x1 << 0)
 117
 118 #define FPGA_INT_STAT_REG               0x20C
 119 #define FPGA_INT_MASK_REG               0x210
 120 #define FPGA_INT_PLL_UNLOCKED           (0x1 << 9)
 121 #define FPGA_INT_DMA_CORE               (0x1 << 8)
 122 #define FPGA_INT_TX_FF_EMPTY            (0x1 << 7)
 123 #define FPGA_INT_RX_FF_EMPTY            (0x1 << 6)
 124 #define FPGA_INT_TX_FF_OVRFLW           (0x1 << 3)
 125 #define FPGA_INT_RX_FF_OVRFLW           (0x1 << 2)
 126 #define FPGA_INT_TX_ACQ_DONE            (0x1 << 1)
 127 #define FPGA_INT_RX_ACQ_DONE            (0x1)
 128
 129 #define FPGA_RX_ADC_CTL_REG             0x214
 130 #define FPGA_RX_ADC_CTL_CONT_CAP        (0x0)
 131 #define FPGA_RX_ADC_CTL_SNAP_CAP        (0x1)
 132
 133 #define FPGA_RX_ARM_REG                 0x21C
 134
 135 #define FPGA_DOM_REG                    0x224
 136 #define FPGA_DOM_DCM_RESET              (0x1 << 5)
 137 #define FPGA_DOM_SOFT_RESET             (0x1 << 4)
 138 #define FPGA_DOM_DUAL_M_SG_DMA          (0x0)
 139 #define FPGA_DOM_TARGET_ACCESS          (0x1)
 140
 141 #define FPGA_TX_CTL_REG                 0x228
 142 #define FPGA_TX_CTL_FIFO_FLUSH          (0x1 << 9)
 143 #define FPGA_TX_CTL_OUTPUT_ZERO         (0x0 << 2)
 144 #define FPGA_TX_CTL_OUTPUT_CARDBUS      (0x1 << 2)
 145 #define FPGA_TX_CTL_OUTPUT_ADC          (0x2 << 2)
 146 #define FPGA_TX_CTL_OUTPUT_SNAPSHOT     (0x3 << 2)
 147 #define FPGA_TX_CTL_LOOPBACK            (0x1 << 0)
 148
 149 #define FPGA_ENDIAN_MODE_REG            0x22C
 150 #define FPGA_RX_FIFO_COUNT_REG          0x28C
 151 #define FPGA_TX_ENABLE_REG              0x298
 152 #define FPGA_TX_TRIGGER_REG             0x29C
 153 #define FPGA_TX_DATAMEM_COUNT_REG       0x2A8
 154 #define FPGA_CAP_FIFO_REG               0x300
 155 #define FPGA_TX_SNAPSHOT_REG            0x8000
 156
 157 /*
 158  * Channel Index Definitions
 159  */
 160
 161 enum {
 162         CHNO_RX_CHANNEL,
 163         CHNO_TX_CHANNEL,
 164 };
 165
 166 struct poch_dev;
 167
 168 enum channel_dir {
 169         CHANNEL_DIR_RX,
 170         CHANNEL_DIR_TX,
 171 };
 172
 173 struct poch_group_info {
 174         struct page *pg;
 175         dma_addr_t dma_addr;
 176         unsigned long user_offset;
 177 };
 178
 179 struct channel_info {
 180         unsigned int chno;
 181
 182         atomic_t sys_block_size;
 183         atomic_t sys_group_size;
 184         atomic_t sys_group_count;
 185
 186         enum channel_dir dir;
 187
 188         unsigned long block_size;
 189         unsigned long group_size;
 190         unsigned long group_count;
 191
 192         /* Contains the DMA address and VM offset of each group. */
 193         struct poch_group_info *groups;
 194
 195         /* Contains the header and circular buffer exported to userspace. */
 196         spinlock_t group_offsets_lock;
 197         struct poch_cbuf_header *header;
 198         struct page *header_pg;
 199         unsigned long header_size;
 200
 201         /* Last group indicated as 'complete' to user space. */
 202         unsigned int transfer;
 203
 204         wait_queue_head_t wq;
 205
 206         union {
 207                 unsigned int data_available;
 208                 unsigned int space_available;
 209         };
 210
 211         void __iomem *bridge_iomem;
 212         void __iomem *fpga_iomem;
 213         spinlock_t *iomem_lock;
 214
 215         atomic_t free;
 216         atomic_t inited;
 217
 218         /* Error counters */
 219         struct poch_counters counters;
 220         spinlock_t counters_lock;
 221
 222         struct device *dev;
 223 };
 224
 225 struct poch_dev {
 226         struct uio_info uio;
 227         struct pci_dev *pci_dev;
 228         unsigned int nchannels;
 229         struct channel_info channels[POCH_NCHANNELS];
 230         struct cdev cdev;
 231
 232         /* Counts the no. of channels that have been opened. On first
 233          * open, the card is powered on. On last channel close, the
 234          * card is powered off.
 235          */
 236         atomic_t usage;
 237
 238         void __iomem *bridge_iomem;
 239         void __iomem *fpga_iomem;
 240         spinlock_t iomem_lock;
 241
 242         struct device *dev;
 243 };
 244
 245 static dev_t poch_first_dev;
 246 static struct class *poch_cls;
 247 static DEFINE_IDR(poch_ids);
 248
 249 static ssize_t store_block_size(struct device *dev,
 250                                 struct device_attribute *attr,
 251                                 const char *buf, size_t count)
 252 {
 253         struct channel_info *channel = dev_get_drvdata(dev);
 254         unsigned long block_size;
 255
 256         sscanf(buf, "%lu", &block_size);
 257         atomic_set(&channel->sys_block_size, block_size);
 258
 259         return count;
 260 }
 261 static DEVICE_ATTR(block_size, S_IWUSR|S_IWGRP, NULL, store_block_size);
 262
 263 static ssize_t store_group_size(struct device *dev,
 264                                 struct device_attribute *attr,
 265                                 const char *buf, size_t count)
 266 {
 267         struct channel_info *channel = dev_get_drvdata(dev);
 268         unsigned long group_size;
 269
 270         sscanf(buf, "%lu", &group_size);
 271         atomic_set(&channel->sys_group_size, group_size);
 272
 273         return count;
 274 }
 275 static DEVICE_ATTR(group_size, S_IWUSR|S_IWGRP, NULL, store_group_size);
 276
 277 static ssize_t store_group_count(struct device *dev,
 278                                 struct device_attribute *attr,
 279                                  const char *buf, size_t count)
 280 {
 281         struct channel_info *channel = dev_get_drvdata(dev);
 282         unsigned long group_count;
 283
 284         sscanf(buf, "%lu", &group_count);
 285         atomic_set(&channel->sys_group_count, group_count);
 286
 287         return count;
 288 }
 289 static DEVICE_ATTR(group_count, S_IWUSR|S_IWGRP, NULL, store_group_count);
 290
 291 static ssize_t show_direction(struct device *dev,
 292                               struct device_attribute *attr, char *buf)
 293 {
 294         struct channel_info *channel = dev_get_drvdata(dev);
 295         int len;
 296
 297         len = sprintf(buf, "%s\n", (channel->dir ? "tx" : "rx"));
 298         return len;
 299 }
 300 static DEVICE_ATTR(dir, S_IRUSR|S_IRGRP, show_direction, NULL);
 301
 302 static ssize_t show_mmap_size(struct device *dev,
 303                               struct device_attribute *attr, char *buf)
 304 {
 305         struct channel_info *channel = dev_get_drvdata(dev);
 306         int len;
 307         unsigned long mmap_size;
 308         unsigned long group_pages;
 309         unsigned long header_pages;
 310         unsigned long total_group_pages;
 311
 312         /* FIXME: We do not have to add 1, if group_size a multiple of
 313            PAGE_SIZE. */
 314         group_pages = (channel->group_size / PAGE_SIZE) + 1;
 315         header_pages = (channel->header_size / PAGE_SIZE) + 1;
 316         total_group_pages = group_pages * channel->group_count;
 317
 318         mmap_size = (header_pages + total_group_pages) * PAGE_SIZE;
 319         len = sprintf(buf, "%lu\n", mmap_size);
 320         return len;
 321 }
 322 static DEVICE_ATTR(mmap_size, S_IRUSR|S_IRGRP, show_mmap_size, NULL);
 323
 324 static struct device_attribute *poch_class_attrs[] = {
 325         &dev_attr_block_size,
 326         &dev_attr_group_size,
 327         &dev_attr_group_count,
 328         &dev_attr_dir,
 329         &dev_attr_mmap_size,
 330 };
 331
 332 static void poch_channel_free_groups(struct channel_info *channel)
 333 {
 334         unsigned long i;
 335
 336         for (i = 0; i < channel->group_count; i++) {
 337                 struct poch_group_info *group;
 338                 unsigned int order;
 339
 340                 group = &channel->groups[i];
 341                 order = get_order(channel->group_size);
 342                 if (group->pg)
 343                         __free_pages(group->pg, order);
 344         }
 345 }
 346
 347 static int poch_channel_alloc_groups(struct channel_info *channel)
 348 {
 349         unsigned long i;
 350         unsigned long group_pages;
 351         unsigned long header_pages;
 352
 353         group_pages = (channel->group_size / PAGE_SIZE) + 1;
 354         header_pages = (channel->header_size / PAGE_SIZE) + 1;
 355
 356         for (i = 0; i < channel->group_count; i++) {
 357                 struct poch_group_info *group;
 358                 unsigned int order;
 359                 gfp_t gfp_mask;
 360
 361                 group = &channel->groups[i];
 362                 order = get_order(channel->group_size);
 363
 364                 /*
 365                  * __GFP_COMP is required here since we are going to
 366                  * perform non-linear mapping to userspace. For more
 367                  * information read the vm_insert_page() function
 368                  * comments.
 369                  */
 370
 371                 gfp_mask = GFP_KERNEL | GFP_DMA32 | __GFP_ZERO;
 372                 group->pg = alloc_pages(gfp_mask, order);
 373                 if (!group->pg) {
 374                         poch_channel_free_groups(channel);
 375                         return -ENOMEM;
 376                 }
 377
 378                 /* FIXME: This is the physical address not the bus
 379                  * address!  This won't work in architectures that
 380                  * have an IOMMU. Can we use pci_map_single() for
 381                  * this?
 382                  */
 383                 group->dma_addr = page_to_pfn(group->pg) * PAGE_SIZE;
 384                 group->user_offset =
 385                         (header_pages + (i * group_pages)) * PAGE_SIZE;
 386
 387                 printk(KERN_INFO PFX "%ld: user_offset: 0x%lx dma: 0x%x\n", i,
 388                        group->user_offset, group->dma_addr);
 389         }
 390
 391         return 0;
 392 }
 393
 394 static void channel_latch_attr(struct channel_info *channel)
 395 {
 396         channel->group_count = atomic_read(&channel->sys_group_count);
 397         channel->group_size = atomic_read(&channel->sys_group_size);
 398         channel->block_size = atomic_read(&channel->sys_block_size);
 399 }
 400
 401 /*
 402  * Configure DMA group registers
 403  */
 404 static void channel_dma_init(struct channel_info *channel)
 405 {
 406         void __iomem *fpga = channel->fpga_iomem;
 407         u32 group_regs_base;
 408         u32 group_reg;
 409         unsigned int page;
 410         unsigned int group_in_page;
 411         unsigned long i;
 412         u32 block_size_reg;
 413         u32 block_count_reg;
 414         u32 group_count_reg;
 415         u32 groups_per_int_reg;
 416         u32 curr_pci_reg;
 417
 418         if (channel->chno == CHNO_RX_CHANNEL) {
 419                 group_regs_base = FPGA_RX_GROUP0_START_REG;
 420                 block_size_reg = FPGA_RX_BLOCK_SIZE_REG;
 421                 block_count_reg = FPGA_RX_BLOCK_COUNT_REG;
 422                 group_count_reg = FPGA_RX_GROUP_COUNT_REG;
 423                 groups_per_int_reg = FPGA_RX_GROUPS_PER_INT_REG;
 424                 curr_pci_reg = FPGA_RX_CURR_PCI_REG;
 425         } else {
 426                 group_regs_base = FPGA_TX_GROUP0_START_REG;
 427                 block_size_reg = FPGA_TX_BLOCK_SIZE_REG;
 428                 block_count_reg = FPGA_TX_BLOCK_COUNT_REG;
 429                 group_count_reg = FPGA_TX_GROUP_COUNT_REG;
 430                 groups_per_int_reg = FPGA_TX_GROUPS_PER_INT_REG;
 431                 curr_pci_reg = FPGA_TX_CURR_PCI_REG;
 432         }
 433
 434         printk(KERN_WARNING "block_size, group_size, group_count\n");
 435         iowrite32(channel->block_size, fpga + block_size_reg);
 436         iowrite32(channel->group_size / channel->block_size,
 437                   fpga + block_count_reg);
 438         iowrite32(channel->group_count, fpga + group_count_reg);
 439         /* FIXME: Hardcoded groups per int. Get it from sysfs? */
 440         iowrite32(1, fpga + groups_per_int_reg);
 441
 442         /* Unlock PCI address? Not defined in the data sheet, but used
 443          * in the reference code by Redrapids.
 444          */
 445         iowrite32(0x1, fpga + curr_pci_reg);
 446
 447         /* The DMA address page register is shared between the RX and
 448          * TX channels, so acquire lock.
 449          */
 450         spin_lock(channel->iomem_lock);
 451         for (i = 0; i < channel->group_count; i++) {
 452                 page = i / 32;
 453                 group_in_page = i % 32;
 454
 455                 group_reg = group_regs_base + (group_in_page * 4);
 456
 457                 iowrite32(page, fpga + FPGA_DMA_ADR_PAGE_REG);
 458                 iowrite32(channel->groups[i].dma_addr, fpga + group_reg);
 459         }
 460         for (i = 0; i < channel->group_count; i++) {
 461                 page = i / 32;
 462                 group_in_page = i % 32;
 463
 464                 group_reg = group_regs_base + (group_in_page * 4);
 465
 466                 iowrite32(page, fpga + FPGA_DMA_ADR_PAGE_REG);
 467                 printk(KERN_INFO PFX "%ld: read dma_addr: 0x%x\n", i,
 468                        ioread32(fpga + group_reg));
 469         }
 470         spin_unlock(channel->iomem_lock);
 471
 472 }
 473
 474 static int poch_channel_alloc_header(struct channel_info *channel)
 475 {
 476         struct poch_cbuf_header *header = channel->header;
 477         unsigned long group_offset_size;
 478         unsigned long tot_group_offsets_size;
 479
 480         /* Allocate memory to hold header exported userspace */
 481         group_offset_size = sizeof(header->group_offsets[0]);
 482         tot_group_offsets_size = group_offset_size * channel->group_count;
 483         channel->header_size = sizeof(*header) + tot_group_offsets_size;
 484         channel->header_pg = alloc_pages(GFP_KERNEL | __GFP_ZERO,
 485                                          get_order(channel->header_size));
 486         if (!channel->header_pg)
 487                 return -ENOMEM;
 488
 489         channel->header = page_address(channel->header_pg);
 490
 491         return 0;
 492 }
 493
 494 static void poch_channel_free_header(struct channel_info *channel)
 495 {
 496         unsigned int order;
 497
 498         order = get_order(channel->header_size);
 499         __free_pages(channel->header_pg, order);
 500 }
 501
 502 static void poch_channel_init_header(struct channel_info *channel)
 503 {
 504         int i;
 505         struct poch_group_info *groups;
 506         s32 *group_offsets;
 507
 508         channel->header->group_size_bytes = channel->group_size;
 509         channel->header->group_count = channel->group_count;
 510
 511         spin_lock_init(&channel->group_offsets_lock);
 512
 513         group_offsets = channel->header->group_offsets;
 514         groups = channel->groups;
 515
 516         for (i = 0; i < channel->group_count; i++) {
 517                 if (channel->dir == CHANNEL_DIR_RX)
 518                         group_offsets[i] = -1;
 519                 else
 520                         group_offsets[i] = groups[i].user_offset;
 521         }
 522 }
 523
 524 static void __poch_channel_clear_counters(struct channel_info *channel)
 525 {
 526         channel->counters.pll_unlock = 0;
 527         channel->counters.fifo_empty = 0;
 528         channel->counters.fifo_overflow = 0;
 529 }
 530
 531 static int poch_channel_init(struct channel_info *channel,
 532                              struct poch_dev *poch_dev)
 533 {
 534         struct pci_dev *pdev = poch_dev->pci_dev;
 535         struct device *dev = &pdev->dev;
 536         unsigned long alloc_size;
 537         int ret;
 538
 539         printk(KERN_WARNING "channel_latch_attr\n");
 540
 541         channel_latch_attr(channel);
 542
 543         channel->transfer = 0;
 544
 545         /* Allocate memory to hold group information. */
 546         alloc_size = channel->group_count * sizeof(struct poch_group_info);
 547         channel->groups = kzalloc(alloc_size, GFP_KERNEL);
 548         if (!channel->groups) {
 549                 dev_err(dev, "error allocating memory for group info\n");
 550                 ret = -ENOMEM;
 551                 goto out;
 552         }
 553
 554         printk(KERN_WARNING "poch_channel_alloc_groups\n");
 555
 556         ret = poch_channel_alloc_groups(channel);
 557         if (ret) {
 558                 dev_err(dev, "error allocating groups of order %d\n",
 559                         get_order(channel->group_size));
 560                 goto out_free_group_info;
 561         }
 562
 563         ret = poch_channel_alloc_header(channel);
 564         if (ret) {
 565                 dev_err(dev, "error allocating user space header\n");
 566                 goto out_free_groups;
 567         }
 568
 569         channel->fpga_iomem = poch_dev->fpga_iomem;
 570         channel->bridge_iomem = poch_dev->bridge_iomem;
 571         channel->iomem_lock = &poch_dev->iomem_lock;
 572         spin_lock_init(&channel->counters_lock);
 573
 574         __poch_channel_clear_counters(channel);
 575
 576         printk(KERN_WARNING "poch_channel_init_header\n");
 577
 578         poch_channel_init_header(channel);
 579
 580         return 0;
 581
 582  out_free_groups:
 583         poch_channel_free_groups(channel);
 584  out_free_group_info:
 585         kfree(channel->groups);
 586  out:
 587         return ret;
 588 }
 589
 590 static int poch_wait_fpga_prog(void __iomem *bridge)
 591 {
 592         unsigned long total_wait;
 593         const unsigned long wait_period = 100;
 594         /* FIXME: Get the actual timeout */
 595         const unsigned long prog_timeo = 10000; /* 10 Seconds */
 596         u32 card_power;
 597
 598         printk(KERN_WARNING "poch_wait_fpg_prog\n");
 599
 600         printk(KERN_INFO PFX "programming fpga ...\n");
 601         total_wait = 0;
 602         while (1) {
 603                 msleep(wait_period);
 604                 total_wait += wait_period;
 605
 606                 card_power = ioread32(bridge + BRIDGE_CARD_POWER_REG);
 607                 if (card_power & BRIDGE_CARD_POWER_PROG_DONE) {
 608                         printk(KERN_INFO PFX "programming done\n");
 609                         return 0;
 610                 }
 611                 if (total_wait > prog_timeo) {
 612                         printk(KERN_ERR PFX
 613                                "timed out while programming FPGA\n");
 614                         return -EIO;
 615                 }
 616         }
 617 }
 618
 619 static void poch_card_power_off(struct poch_dev *poch_dev)
 620 {
 621         void __iomem *bridge = poch_dev->bridge_iomem;
 622         u32 card_power;
 623
 624         iowrite32(0, bridge + BRIDGE_INT_MASK_REG);
 625         iowrite32(0, bridge + BRIDGE_DMA_GO_REG);
 626
 627         card_power = ioread32(bridge + BRIDGE_CARD_POWER_REG);
 628         iowrite32(card_power & ~BRIDGE_CARD_POWER_EN,
 629                   bridge + BRIDGE_CARD_POWER_REG);
 630 }
 631
 632 enum clk_src {
 633         CLK_SRC_ON_BOARD,
 634         CLK_SRC_EXTERNAL
 635 };
 636
 637 static void poch_card_clock_on(void __iomem *fpga)
 638 {
 639         /* FIXME: Get this data through sysfs? */
 640         enum clk_src clk_src = CLK_SRC_ON_BOARD;
 641
 642         if (clk_src == CLK_SRC_ON_BOARD) {
 643                 iowrite32(FPGA_ADC_CLOCK_LOCAL_CLK | FPGA_ADC_CLOCK_CTL_OSC_EN,
 644                           fpga + FPGA_ADC_CLOCK_CTL_REG);
 645         } else if (clk_src == CLK_SRC_EXTERNAL) {
 646                 iowrite32(FPGA_ADC_CLOCK_EXT_SAMP_CLK,
 647                           fpga + FPGA_ADC_CLOCK_CTL_REG);
 648         }
 649 }
 650
 651 static int poch_card_power_on(struct poch_dev *poch_dev)
 652 {
 653         void __iomem *bridge = poch_dev->bridge_iomem;
 654         void __iomem *fpga = poch_dev->fpga_iomem;
 655
 656         iowrite32(BRIDGE_CARD_POWER_EN, bridge + BRIDGE_CARD_POWER_REG);
 657
 658         if (poch_wait_fpga_prog(bridge) != 0) {
 659                 poch_card_power_off(poch_dev);
 660                 return -EIO;
 661         }
 662
 663         poch_card_clock_on(fpga);
 664
 665         /* Sync to new clock, reset state machines, set DMA mode. */
 666         iowrite32(FPGA_DOM_DCM_RESET | FPGA_DOM_SOFT_RESET
 667                   | FPGA_DOM_DUAL_M_SG_DMA, fpga + FPGA_DOM_REG);
 668
 669         /* FIXME: The time required for sync. needs to be tuned. */
 670         msleep(1000);
 671
 672         return 0;
 673 }
 674
 675 static void poch_channel_analog_on(struct channel_info *channel)
 676 {
 677         void __iomem *fpga = channel->fpga_iomem;
 678         u32 adc_dac_en;
 679
 680         spin_lock(channel->iomem_lock);
 681         adc_dac_en = ioread32(fpga + FPGA_ADC_DAC_EN_REG);
 682         switch (channel->chno) {
 683         case CHNO_RX_CHANNEL:
 684                 iowrite32(adc_dac_en & ~FPGA_ADC_DAC_EN_ADC_OFF,
 685                           fpga + FPGA_ADC_DAC_EN_REG);
 686                 break;
 687         case CHNO_TX_CHANNEL:
 688                 iowrite32(adc_dac_en & ~FPGA_ADC_DAC_EN_DAC_OFF,
 689                           fpga + FPGA_ADC_DAC_EN_REG);
 690                 break;
 691         }
 692         spin_unlock(channel->iomem_lock);
 693 }
 694
 695 static int poch_open(struct inode *inode, struct file *filp)
 696 {
 697         struct poch_dev *poch_dev;
 698         struct channel_info *channel;
 699         void __iomem *bridge;
 700         void __iomem *fpga;
 701         int chno;
 702         int usage;
 703         int ret;
 704
 705         poch_dev = container_of(inode->i_cdev, struct poch_dev, cdev);
 706         bridge = poch_dev->bridge_iomem;
 707         fpga = poch_dev->fpga_iomem;
 708
 709         chno = iminor(inode) % poch_dev->nchannels;
 710         channel = &poch_dev->channels[chno];
 711
 712         if (!atomic_dec_and_test(&channel->free)) {
 713                 atomic_inc(&channel->free);
 714                 ret = -EBUSY;
 715                 goto out;
 716         }
 717
 718         usage = atomic_inc_return(&poch_dev->usage);
 719
 720         printk(KERN_WARNING "poch_card_power_on\n");
 721
 722         if (usage == 1) {
 723                 ret = poch_card_power_on(poch_dev);
 724                 if (ret)
 725                         goto out_dec_usage;
 726         }
 727
 728         printk(KERN_INFO "CardBus Bridge Revision: %x\n",
 729                ioread32(bridge + BRIDGE_REV_REG));
 730         printk(KERN_INFO "CardBus Interface Revision: %x\n",
 731                ioread32(fpga + FPGA_IFACE_REV_REG));
 732
 733         channel->chno = chno;
 734         filp->private_data = channel;
 735
 736         printk(KERN_WARNING "poch_channel_init\n");
 737
 738         ret = poch_channel_init(channel, poch_dev);
 739         if (ret)
 740                 goto out_power_off;
 741
 742         poch_channel_analog_on(channel);
 743
 744         printk(KERN_WARNING "channel_dma_init\n");
 745
 746         channel_dma_init(channel);
 747
 748         printk(KERN_WARNING "poch_channel_analog_on\n");
 749
 750         if (usage == 1) {
 751                 printk(KERN_WARNING "setting up DMA\n");
 752
 753                 /* Initialize DMA Controller. */
 754                 iowrite32(FPGA_CAP_FIFO_REG, bridge + BRIDGE_STAT_2_REG);
 755                 iowrite32(FPGA_DMA_DESC_1_REG, bridge + BRIDGE_STAT_3_REG);
 756
 757                 ioread32(fpga + FPGA_DMA_INT_STAT_REG);
 758                 ioread32(fpga + FPGA_INT_STAT_REG);
 759                 ioread32(bridge + BRIDGE_INT_STAT_REG);
 760
 761                 /* Initialize Interrupts. FIXME: Enable temperature
 762                  * handling We are enabling both Tx and Rx channel
 763                  * interrupts here. Do we need to enable interrupts
 764                  * only for the current channel? Anyways we won't get
 765                  * the interrupt unless the DMA is activated.
 766                  */
 767                 iowrite32(BRIDGE_INT_FPGA, bridge + BRIDGE_INT_MASK_REG);
 768                 iowrite32(FPGA_INT_DMA_CORE
 769                           | FPGA_INT_PLL_UNLOCKED
 770                           | FPGA_INT_TX_FF_EMPTY
 771                           | FPGA_INT_RX_FF_EMPTY
 772                           | FPGA_INT_TX_FF_OVRFLW
 773                           | FPGA_INT_RX_FF_OVRFLW,
 774                           fpga + FPGA_INT_MASK_REG);
 775                 iowrite32(FPGA_DMA_INT_RX | FPGA_DMA_INT_TX,
 776                           fpga + FPGA_DMA_INT_MASK_REG);
 777         }
 778
 779         if (channel->dir == CHANNEL_DIR_TX) {
 780                 /* Flush TX FIFO and output data from cardbus. */
 781                 iowrite32(FPGA_TX_CTL_FIFO_FLUSH
 782                           | FPGA_TX_CTL_OUTPUT_CARDBUS,
 783                           fpga + FPGA_TX_CTL_REG);
 784         }
 785
 786         atomic_inc(&channel->inited);
 787
 788         return 0;
 789
 790  out_power_off:
 791         if (usage == 1)
 792                 poch_card_power_off(poch_dev);
 793  out_dec_usage:
 794         atomic_dec(&poch_dev->usage);
 795         atomic_inc(&channel->free);
 796  out:
 797         return ret;
 798 }
 799
 800 static int poch_release(struct inode *inode, struct file *filp)
 801 {
 802         struct channel_info *channel = filp->private_data;
 803         struct poch_dev *poch_dev;
 804         int usage;
 805
 806         poch_dev = container_of(inode->i_cdev, struct poch_dev, cdev);
 807
 808         usage = atomic_dec_return(&poch_dev->usage);
 809         if (usage == 0) {
 810                 printk(KERN_WARNING "poch_card_power_off\n");
 811                 poch_card_power_off(poch_dev);
 812         }
 813
 814         atomic_dec(&channel->inited);
 815         poch_channel_free_header(channel);
 816         poch_channel_free_groups(channel);
 817         kfree(channel->groups);
 818         atomic_inc(&channel->free);
 819
 820         return 0;
 821 }
 822
 823 /*
 824  * Map the header and the group buffers, to user space.
 825  */
 826 static int poch_mmap(struct file *filp, struct vm_area_struct *vma)
 827 {
 828         struct channel_info *channel = filp->private_data;
 829
 830         unsigned long start;
 831         unsigned long size;
 832
 833         unsigned long group_pages;
 834         unsigned long header_pages;
 835         unsigned long total_group_pages;
 836
 837         int pg_num;
 838         struct page *pg;
 839
 840         int i;
 841         int ret;
 842
 843         printk(KERN_WARNING "poch_mmap\n");
 844
 845         if (vma->vm_pgoff) {
 846                 printk(KERN_WARNING PFX "page offset: %lu\n", vma->vm_pgoff);
 847                 return -EINVAL;
 848         }
 849
 850         group_pages = (channel->group_size / PAGE_SIZE) + 1;
 851         header_pages = (channel->header_size / PAGE_SIZE) + 1;
 852         total_group_pages = group_pages * channel->group_count;
 853
 854         size = vma->vm_end - vma->vm_start;
 855         if (size != (header_pages + total_group_pages) * PAGE_SIZE) {
 856                 printk(KERN_WARNING PFX "required %lu bytes\n", size);
 857                 return -EINVAL;
 858         }
 859
 860         start = vma->vm_start;
 861
 862         /* FIXME: Cleanup required on failure? */
 863         pg = channel->header_pg;
 864         for (pg_num = 0; pg_num < header_pages; pg_num++, pg++) {
 865                 printk(KERN_DEBUG PFX "page_count: %d\n", page_count(pg));
 866                 printk(KERN_DEBUG PFX "%d: header: 0x%lx\n", pg_num, start);
 867                 ret = vm_insert_page(vma, start, pg);
 868                 if (ret) {
 869                         printk(KERN_DEBUG "vm_insert 1 failed at %lx\n", start);
 870                         return ret;
 871                 }
 872                 start += PAGE_SIZE;
 873         }
 874
 875         for (i = 0; i < channel->group_count; i++) {
 876                 pg = channel->groups[i].pg;
 877                 for (pg_num = 0; pg_num < group_pages; pg_num++, pg++) {
 878                         printk(KERN_DEBUG PFX "%d: group %d: 0x%lx\n",
 879                                pg_num, i, start);
 880                         ret = vm_insert_page(vma, start, pg);
 881                         if (ret) {
 882                                 printk(KERN_DEBUG PFX
 883                                        "vm_insert 2 failed at %d\n", pg_num);
 884                                 return ret;
 885                         }
 886                         start += PAGE_SIZE;
 887                 }
 888         }
 889
 890         return 0;
 891 }
 892
 893 /*
 894  * Check whether there is some group that the user space has not
 895  * consumed yet. When the user space consumes a group, it sets it to
 896  * -1. Cosuming could be reading data in case of RX and filling a
 897  * buffer in case of TX.
 898  */
 899 static int poch_channel_available(struct channel_info *channel)
 900 {
 901         int i;
 902
 903         spin_lock_irq(&channel->group_offsets_lock);
 904
 905         for (i = 0; i < channel->group_count; i++) {
 906                 if (channel->dir == CHANNEL_DIR_RX
 907                     && channel->header->group_offsets[i] == -1) {
 908                         spin_unlock_irq(&channel->group_offsets_lock);
 909                         return 1;
 910                 }
 911
 912                 if (channel->dir == CHANNEL_DIR_TX
 913                     && channel->header->group_offsets[i] != -1) {
 914                         spin_unlock_irq(&channel->group_offsets_lock);
 915                         return 1;
 916                 }
 917         }
 918
 919         spin_unlock_irq(&channel->group_offsets_lock);
 920
 921         return 0;
 922 }
 923
 924 static unsigned int poch_poll(struct file *filp, poll_table *pt)
 925 {
 926         struct channel_info *channel = filp->private_data;
 927         unsigned int ret = 0;
 928
 929         poll_wait(filp, &channel->wq, pt);
 930
 931         if (poch_channel_available(channel)) {
 932                 if (channel->dir == CHANNEL_DIR_RX)
 933                         ret = POLLIN | POLLRDNORM;
 934                 else
 935                         ret = POLLOUT | POLLWRNORM;
 936         }
 937
 938         return ret;
 939 }
 940
 941 static int poch_ioctl(struct inode *inode, struct file *filp,
 942                       unsigned int cmd, unsigned long arg)
 943 {
 944         struct channel_info *channel = filp->private_data;
 945         void __iomem *fpga = channel->fpga_iomem;
 946         void __iomem *bridge = channel->bridge_iomem;
 947         void __user *argp = (void __user *)arg;
 948         struct vm_area_struct *vms;
 949         struct poch_counters counters;
 950         int ret;
 951
 952         switch (cmd) {
 953         case POCH_IOC_TRANSFER_START:
 954                 switch (channel->chno) {
 955                 case CHNO_TX_CHANNEL:
 956                         printk(KERN_INFO PFX "ioctl: Tx start\n");
 957                         iowrite32(0x1, fpga + FPGA_TX_TRIGGER_REG);
 958                         iowrite32(0x1, fpga + FPGA_TX_ENABLE_REG);
 959
 960                         /* FIXME: Does it make sense to do a DMA GO
 961                          * twice, once in Tx and once in Rx.
 962                          */
 963                         iowrite32(0x1, bridge + BRIDGE_DMA_GO_REG);
 964                         break;
 965                 case CHNO_RX_CHANNEL:
 966                         printk(KERN_INFO PFX "ioctl: Rx start\n");
 967                         iowrite32(0x1, fpga + FPGA_RX_ARM_REG);
 968                         iowrite32(0x1, bridge + BRIDGE_DMA_GO_REG);
 969                         break;
 970                 }
 971                 break;
 972         case POCH_IOC_TRANSFER_STOP:
 973                 switch (channel->chno) {
 974                 case CHNO_TX_CHANNEL:
 975                         printk(KERN_INFO PFX "ioctl: Tx stop\n");
 976                         iowrite32(0x0, fpga + FPGA_TX_ENABLE_REG);
 977                         iowrite32(0x0, fpga + FPGA_TX_TRIGGER_REG);
 978                         iowrite32(0x0, bridge + BRIDGE_DMA_GO_REG);
 979                         break;
 980                 case CHNO_RX_CHANNEL:
 981                         printk(KERN_INFO PFX "ioctl: Rx stop\n");
 982                         iowrite32(0x0, fpga + FPGA_RX_ARM_REG);
 983                         iowrite32(0x0, bridge + BRIDGE_DMA_GO_REG);
 984                         break;
 985                 }
 986                 break;
 987         case POCH_IOC_GET_COUNTERS:
 988                 if (access_ok(VERIFY_WRITE, argp, sizeof(struct poch_counters)))
 989                         return -EFAULT;
 990
 991                 spin_lock_irq(&channel->counters_lock);
 992                 counters = channel->counters;
 993                 __poch_channel_clear_counters(channel);
 994                 spin_unlock_irq(&channel->counters_lock);
 995
 996                 ret = copy_to_user(argp, &counters,
 997                                    sizeof(struct poch_counters));
 998                 if (ret)
 999                         return ret;
1000
1001                 break;
1002         case POCH_IOC_SYNC_GROUP_FOR_USER:
1003         case POCH_IOC_SYNC_GROUP_FOR_DEVICE:
1004                 vms = find_vma(current->mm, arg);
1005                 if (!vms)
1006                         /* Address not mapped. */
1007                         return -EINVAL;
1008                 if (vms->vm_file != filp)
1009                         /* Address mapped from different device/file. */
1010                         return -EINVAL;
1011
1012                 flush_cache_range(vms, arg, arg + channel->group_size);
1013                 break;
1014         }
1015         return 0;
1016 }
1017
1018 static struct file_operations poch_fops = {
1019         .owner = THIS_MODULE,
1020         .open = poch_open,
1021         .release = poch_release,
1022         .ioctl = poch_ioctl,
1023         .poll = poch_poll,
1024         .mmap = poch_mmap
1025 };
1026
1027 static void poch_irq_dma(struct channel_info *channel)
1028 {
1029         u32 prev_transfer;
1030         u32 curr_transfer;
1031         long groups_done;
1032         unsigned long i, j;
1033         struct poch_group_info *groups;
1034         s32 *group_offsets;
1035         u32 curr_group_reg;
1036
1037         if (!atomic_read(&channel->inited))
1038                 return;
1039
1040         prev_transfer = channel->transfer;
1041
1042         if (channel->chno == CHNO_RX_CHANNEL)
1043                 curr_group_reg = FPGA_RX_CURR_GROUP_REG;
1044         else
1045                 curr_group_reg = FPGA_TX_CURR_GROUP_REG;
1046
1047         curr_transfer = ioread32(channel->fpga_iomem + curr_group_reg);
1048
1049         groups_done = curr_transfer - prev_transfer;
1050         /* Check wrap over, and handle it. */
1051         if (groups_done <= 0)
1052                 groups_done += channel->group_count;
1053
1054         group_offsets = channel->header->group_offsets;
1055         groups = channel->groups;
1056
1057         spin_lock(&channel->group_offsets_lock);
1058
1059         for (i = 0; i < groups_done; i++) {
1060                 j = (prev_transfer + i) % channel->group_count;
1061                 if (channel->dir == CHANNEL_DIR_RX)
1062                         group_offsets[j] = -1;
1063                 else
1064                         group_offsets[j] = groups[j].user_offset;
1065         }
1066
1067         spin_unlock(&channel->group_offsets_lock);
1068
1069         channel->transfer = curr_transfer;
1070
1071         wake_up_interruptible(&channel->wq);
1072 }
1073
1074 static irqreturn_t poch_irq_handler(int irq, void *p)
1075 {
1076         struct poch_dev *poch_dev = p;
1077         void __iomem *bridge = poch_dev->bridge_iomem;
1078         void __iomem *fpga = poch_dev->fpga_iomem;
1079         struct channel_info *channel_rx = &poch_dev->channels[CHNO_RX_CHANNEL];
1080         struct channel_info *channel_tx = &poch_dev->channels[CHNO_TX_CHANNEL];
1081         u32 bridge_stat;
1082         u32 fpga_stat;
1083         u32 dma_stat;
1084
1085         bridge_stat = ioread32(bridge + BRIDGE_INT_STAT_REG);
1086         fpga_stat = ioread32(fpga + FPGA_INT_STAT_REG);
1087         dma_stat = ioread32(fpga + FPGA_DMA_INT_STAT_REG);
1088
1089         ioread32(fpga + FPGA_DMA_INT_STAT_REG);
1090         ioread32(fpga + FPGA_INT_STAT_REG);
1091         ioread32(bridge + BRIDGE_INT_STAT_REG);
1092
1093         if (bridge_stat & BRIDGE_INT_FPGA) {
1094                 if (fpga_stat & FPGA_INT_DMA_CORE) {
1095                         if (dma_stat & FPGA_DMA_INT_RX)
1096                                 poch_irq_dma(channel_rx);
1097                         if (dma_stat & FPGA_DMA_INT_TX)
1098                                 poch_irq_dma(channel_tx);
1099                 }
1100                 if (fpga_stat & FPGA_INT_PLL_UNLOCKED) {
1101                         channel_tx->counters.pll_unlock++;
1102                         channel_rx->counters.pll_unlock++;
1103                         if (printk_ratelimit())
1104                                 printk(KERN_WARNING PFX "PLL unlocked\n");
1105                 }
1106                 if (fpga_stat & FPGA_INT_TX_FF_EMPTY)
1107                         channel_tx->counters.fifo_empty++;
1108                 if (fpga_stat & FPGA_INT_TX_FF_OVRFLW)
1109                         channel_tx->counters.fifo_overflow++;
1110                 if (fpga_stat & FPGA_INT_RX_FF_EMPTY)
1111                         channel_rx->counters.fifo_empty++;
1112                 if (fpga_stat & FPGA_INT_RX_FF_OVRFLW)
1113                         channel_rx->counters.fifo_overflow++;
1114
1115                 /*
1116                  * FIXME: These errors should be notified through the
1117                  * poll interface as POLLERR.
1118                  */
1119
1120                 /* Re-enable interrupts. */
1121                 iowrite32(BRIDGE_INT_FPGA, bridge + BRIDGE_INT_MASK_REG);
1122
1123                 return IRQ_HANDLED;
1124         }
1125
1126         return IRQ_NONE;
1127 }
1128
1129 static void poch_class_dev_unregister(struct poch_dev *poch_dev, int id)
1130 {
1131         int i, j;
1132         int nattrs;
1133         struct channel_info *channel;
1134         dev_t devno;
1135
1136         if (poch_dev->dev == NULL)
1137                 return;
1138
1139         for (i = 0; i < poch_dev->nchannels; i++) {
1140                 channel = &poch_dev->channels[i];
1141                 devno = poch_first_dev + (id * poch_dev->nchannels) + i;
1142
1143                 if (!channel->dev)
1144                         continue;
1145
1146                 nattrs = sizeof(poch_class_attrs)/sizeof(poch_class_attrs[0]);
1147                 for (j = 0; j < nattrs; j++)
1148                         device_remove_file(channel->dev, poch_class_attrs[j]);
1149
1150                 device_unregister(channel->dev);
1151         }
1152
1153         device_unregister(poch_dev->dev);
1154 }
1155
1156 static int __devinit poch_class_dev_register(struct poch_dev *poch_dev,
1157                                              int id)
1158 {
1159         struct device *dev = &poch_dev->pci_dev->dev;
1160         int i, j;
1161         int nattrs;
1162         int ret;
1163         struct channel_info *channel;
1164         dev_t devno;
1165
1166         poch_dev->dev = device_create(poch_cls, &poch_dev->pci_dev->dev,
1167                                       MKDEV(0, 0), NULL, "poch%d", id);
1168         if (IS_ERR(poch_dev->dev)) {
1169                 dev_err(dev, "error creating parent class device");
1170                 ret = PTR_ERR(poch_dev->dev);
1171                 poch_dev->dev = NULL;
1172                 return ret;
1173         }
1174
1175         for (i = 0; i < poch_dev->nchannels; i++) {
1176                 channel = &poch_dev->channels[i];
1177
1178                 devno = poch_first_dev + (id * poch_dev->nchannels) + i;
1179                 channel->dev = device_create(poch_cls, poch_dev->dev, devno,
1180                                              NULL, "ch%d", i);
1181                 if (IS_ERR(channel->dev)) {
1182                         dev_err(dev, "error creating channel class device");
1183                         ret = PTR_ERR(channel->dev);
1184                         channel->dev = NULL;
1185                         poch_class_dev_unregister(poch_dev, id);
1186                         return ret;
1187                 }
1188
1189                 dev_set_drvdata(channel->dev, channel);
1190                 nattrs = sizeof(poch_class_attrs)/sizeof(poch_class_attrs[0]);
1191                 for (j = 0; j < nattrs; j++) {
1192                         ret = device_create_file(channel->dev,
1193                                                  poch_class_attrs[j]);
1194                         if (ret) {
1195                                 dev_err(dev, "error creating attribute file");
1196                                 poch_class_dev_unregister(poch_dev, id);
1197                                 return ret;
1198                         }
1199                 }
1200         }
1201
1202         return 0;
1203 }
1204
1205 static int __devinit poch_pci_probe(struct pci_dev *pdev,
1206                                     const struct pci_device_id *pci_id)
1207 {
1208         struct device *dev = &pdev->dev;
1209         struct poch_dev *poch_dev;
1210         struct uio_info *uio;
1211         int ret;
1212         int id;
1213         int i;
1214
1215         poch_dev = kzalloc(sizeof(struct poch_dev), GFP_KERNEL);
1216         if (!poch_dev) {
1217                 dev_err(dev, "error allocating priv. data memory\n");
1218                 return -ENOMEM;
1219         }
1220
1221         poch_dev->pci_dev = pdev;
1222         uio = &poch_dev->uio;
1223
1224         pci_set_drvdata(pdev, poch_dev);
1225
1226         spin_lock_init(&poch_dev->iomem_lock);
1227
1228         poch_dev->nchannels = POCH_NCHANNELS;
1229         poch_dev->channels[CHNO_RX_CHANNEL].dir = CHANNEL_DIR_RX;
1230         poch_dev->channels[CHNO_TX_CHANNEL].dir = CHANNEL_DIR_TX;
1231
1232         for (i = 0; i < poch_dev->nchannels; i++) {
1233                 init_waitqueue_head(&poch_dev->channels[i].wq);
1234                 atomic_set(&poch_dev->channels[i].free, 1);
1235                 atomic_set(&poch_dev->channels[i].inited, 0);
1236         }
1237
1238         ret = pci_enable_device(pdev);
1239         if (ret) {
1240                 dev_err(dev, "error enabling device\n");
1241                 goto out_free;
1242         }
1243
1244         ret = pci_request_regions(pdev, "poch");
1245         if (ret) {
1246                 dev_err(dev, "error requesting resources\n");
1247                 goto out_disable;
1248         }
1249
1250         uio->mem[0].addr = pci_resource_start(pdev, 1);
1251         if (!uio->mem[0].addr) {
1252                 dev_err(dev, "invalid BAR1\n");
1253                 ret = -ENODEV;
1254                 goto out_release;
1255         }
1256
1257         uio->mem[0].size = pci_resource_len(pdev, 1);
1258         uio->mem[0].memtype = UIO_MEM_PHYS;
1259
1260         uio->name = "poch";
1261         uio->version = "0.0.1";
1262         uio->irq = -1;
1263         ret = uio_register_device(dev, uio);
1264         if (ret) {
1265                 dev_err(dev, "error register UIO device: %d\n", ret);
1266                 goto out_release;
1267         }
1268
1269         poch_dev->bridge_iomem = ioremap(pci_resource_start(pdev, 0),
1270                                          pci_resource_len(pdev, 0));
1271         if (poch_dev->bridge_iomem == NULL) {
1272                 dev_err(dev, "error mapping bridge (bar0) registers\n");
1273                 ret = -ENOMEM;
1274                 goto out_uio_unreg;
1275         }
1276
1277         poch_dev->fpga_iomem = ioremap(pci_resource_start(pdev, 1),
1278                                        pci_resource_len(pdev, 1));
1279         if (poch_dev->fpga_iomem == NULL) {
1280                 dev_err(dev, "error mapping fpga (bar1) registers\n");
1281                 ret = -ENOMEM;
1282                 goto out_bar0_unmap;
1283         }
1284
1285         ret = request_irq(pdev->irq, poch_irq_handler, IRQF_SHARED,
1286                           dev->bus_id, poch_dev);
1287         if (ret) {
1288                 dev_err(dev, "error requesting IRQ %u\n", pdev->irq);
1289                 ret = -ENOMEM;
1290                 goto out_bar1_unmap;
1291         }
1292
1293         if (!idr_pre_get(&poch_ids, GFP_KERNEL)) {
1294                 dev_err(dev, "error allocating memory ids\n");
1295                 ret = -ENOMEM;
1296                 goto out_free_irq;
1297         }
1298
1299         idr_get_new(&poch_ids, poch_dev, &id);
1300         if (id >= MAX_POCH_CARDS) {
1301                 dev_err(dev, "minors exhausted\n");
1302                 ret = -EBUSY;
1303                 goto out_free_irq;
1304         }
1305
1306         cdev_init(&poch_dev->cdev, &poch_fops);
1307         poch_dev->cdev.owner = THIS_MODULE;
1308         ret = cdev_add(&poch_dev->cdev,
1309                        poch_first_dev + (id * poch_dev->nchannels),
1310                        poch_dev->nchannels);
1311         if (ret) {
1312                 dev_err(dev, "error register character device\n");
1313                 goto out_idr_remove;
1314         }
1315
1316         ret = poch_class_dev_register(poch_dev, id);
1317         if (ret)
1318                 goto out_cdev_del;
1319
1320         return 0;
1321
1322  out_cdev_del:
1323         cdev_del(&poch_dev->cdev);
1324  out_idr_remove:
1325         idr_remove(&poch_ids, id);
1326  out_free_irq:
1327         free_irq(pdev->irq, poch_dev);
1328  out_bar1_unmap:
1329         iounmap(poch_dev->fpga_iomem);
1330  out_bar0_unmap:
1331         iounmap(poch_dev->bridge_iomem);
1332  out_uio_unreg:
1333         uio_unregister_device(uio);
1334  out_release:
1335         pci_release_regions(pdev);
1336  out_disable:
1337         pci_disable_device(pdev);
1338  out_free:
1339         kfree(poch_dev);
1340         return ret;
1341 }
1342
1343 /*
1344  * FIXME: We are yet to handle the hot unplug case.
1345  */
1346 static void poch_pci_remove(struct pci_dev *pdev)
1347 {
1348         struct poch_dev *poch_dev = pci_get_drvdata(pdev);
1349         struct uio_info *uio = &poch_dev->uio;
1350         unsigned int minor = MINOR(poch_dev->cdev.dev);
1351         unsigned int id = minor / poch_dev->nchannels;
1352
1353         /* FIXME: unmap fpga_iomem and bridge_iomem */
1354
1355         poch_class_dev_unregister(poch_dev, id);
1356         cdev_del(&poch_dev->cdev);
1357         idr_remove(&poch_ids, id);
1358         free_irq(pdev->irq, poch_dev);
1359         uio_unregister_device(uio);
1360         pci_release_regions(pdev);
1361         pci_disable_device(pdev);
1362         pci_set_drvdata(pdev, NULL);
1363         iounmap(uio->mem[0].internal_addr);
1364
1365         kfree(poch_dev);
1366 }
1367
1368 static const struct pci_device_id poch_pci_ids[] /* __devinitconst */ = {
1369         { PCI_DEVICE(PCI_VENDOR_ID_RRAPIDS,
1370                      PCI_DEVICE_ID_RRAPIDS_POCKET_CHANGE) },
1371         { 0, }
1372 };
1373
1374 static struct pci_driver poch_pci_driver = {
1375         .name = DRV_NAME,
1376         .id_table = poch_pci_ids,
1377         .probe = poch_pci_probe,
1378         .remove = poch_pci_remove,
1379 };
1380
1381 static int __init poch_init_module(void)
1382 {
1383         int ret = 0;
1384
1385         ret = alloc_chrdev_region(&poch_first_dev, 0,
1386                                   MAX_POCH_DEVICES, DRV_NAME);
1387         if (ret) {
1388                 printk(KERN_ERR PFX "error allocating device no.");
1389                 return ret;
1390         }
1391
1392         poch_cls = class_create(THIS_MODULE, "pocketchange");
1393         if (IS_ERR(poch_cls)) {
1394                 ret = PTR_ERR(poch_cls);
1395                 goto out_unreg_chrdev;
1396         }
1397
1398         ret = pci_register_driver(&poch_pci_driver);
1399         if (ret) {
1400                 printk(KERN_ERR PFX "error register PCI device");
1401                 goto out_class_destroy;
1402         }
1403
1404         return 0;
1405
1406  out_class_destroy:
1407         class_destroy(poch_cls);
1408
1409  out_unreg_chrdev:
1410         unregister_chrdev_region(poch_first_dev, MAX_POCH_DEVICES);
1411
1412         return ret;
1413 }
1414
1415 static void __exit poch_exit_module(void)
1416 {
1417         pci_unregister_driver(&poch_pci_driver);
1418         class_destroy(poch_cls);
1419         unregister_chrdev_region(poch_first_dev, MAX_POCH_DEVICES);
1420 }
1421
1422 module_init(poch_init_module);
1423 module_exit(poch_exit_module);
1424
1425 MODULE_LICENSE("GPL v2");