git.oblomov.eu Git - linux-2.6/blob - drivers/misc/tifm_7xx1.c

   1 /*
   2  *  tifm_7xx1.c - TI FlashMedia driver
   3  *
   4  *  Copyright (C) 2006 Alex Dubov <oakad@yahoo.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  */
  11
  12 #include <linux/tifm.h>
  13
  14 #define DRIVER_NAME "tifm_7xx1"
  15 #define DRIVER_VERSION "0.8"
  16
  17 #define TIFM_IRQ_ENABLE           0x80000000
  18 #define TIFM_IRQ_SOCKMASK(x)      (x)
  19 #define TIFM_IRQ_CARDMASK(x)      ((x) << 8)
  20 #define TIFM_IRQ_FIFOMASK(x)      ((x) << 16)
  21 #define TIFM_IRQ_SETALL           0xffffffff
  22
  23 static void tifm_7xx1_dummy_eject(struct tifm_adapter *fm,
  24                                   struct tifm_dev *sock)
  25 {
  26 }
  27
  28 static void tifm_7xx1_eject(struct tifm_adapter *fm, struct tifm_dev *sock)
  29 {
  30         unsigned long flags;
  31
  32         spin_lock_irqsave(&fm->lock, flags);
  33         fm->socket_change_set |= 1 << sock->socket_id;
  34         tifm_queue_work(&fm->media_switcher);
  35         spin_unlock_irqrestore(&fm->lock, flags);
  36 }
  37
  38 static irqreturn_t tifm_7xx1_isr(int irq, void *dev_id)
  39 {
  40         struct tifm_adapter *fm = dev_id;
  41         struct tifm_dev *sock;
  42         unsigned int irq_status, cnt;
  43
  44         spin_lock(&fm->lock);
  45         irq_status = readl(fm->addr + FM_INTERRUPT_STATUS);
  46         if (irq_status == 0 || irq_status == (~0)) {
  47                 spin_unlock(&fm->lock);
  48                 return IRQ_NONE;
  49         }
  50
  51         if (irq_status & TIFM_IRQ_ENABLE) {
  52                 writel(TIFM_IRQ_ENABLE, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
  53
  54                 for (cnt = 0; cnt < fm->num_sockets; cnt++) {
  55                         sock = fm->sockets[cnt];
  56                         if (sock) {
  57                                 if ((irq_status >> cnt) & TIFM_IRQ_FIFOMASK(1))
  58                                         sock->data_event(sock);
  59                                 if ((irq_status >> cnt) & TIFM_IRQ_CARDMASK(1))
  60                                         sock->card_event(sock);
  61                         }
  62                 }
  63
  64                 fm->socket_change_set |= irq_status
  65                                          & ((1 << fm->num_sockets) - 1);
  66         }
  67         writel(irq_status, fm->addr + FM_INTERRUPT_STATUS);
  68
  69         if (fm->finish_me)
  70                 complete_all(fm->finish_me);
  71         else if (!fm->socket_change_set)
  72                 writel(TIFM_IRQ_ENABLE, fm->addr + FM_SET_INTERRUPT_ENABLE);
  73         else
  74                 tifm_queue_work(&fm->media_switcher);
  75
  76         spin_unlock(&fm->lock);
  77         return IRQ_HANDLED;
  78 }
  79
  80 static unsigned char tifm_7xx1_toggle_sock_power(char __iomem *sock_addr)
  81 {
  82         unsigned int s_state;
  83         int cnt;
  84
  85         writel(0x0e00, sock_addr + SOCK_CONTROL);
  86
  87         for (cnt = 16; cnt <= 256; cnt <<= 1) {
  88                 if (!(TIFM_SOCK_STATE_POWERED
  89                       & readl(sock_addr + SOCK_PRESENT_STATE)))
  90                         break;
  91
  92                 msleep(cnt);
  93         }
  94
  95         s_state = readl(sock_addr + SOCK_PRESENT_STATE);
  96         if (!(TIFM_SOCK_STATE_OCCUPIED & s_state))
  97                 return 0;
  98
  99         writel(readl(sock_addr + SOCK_CONTROL) | TIFM_CTRL_LED,
 100                sock_addr + SOCK_CONTROL);
 101
 102         /* xd needs some extra time before power on */
 103         if (((readl(sock_addr + SOCK_PRESENT_STATE) >> 4) & 7)
 104             == TIFM_TYPE_XD)
 105                 msleep(40);
 106
 107         writel((s_state & 7) | 0x0c00, sock_addr + SOCK_CONTROL);
 108         /* wait for power to stabilize */
 109         msleep(20);
 110         for (cnt = 16; cnt <= 256; cnt <<= 1) {
 111                 if ((TIFM_SOCK_STATE_POWERED
 112                      & readl(sock_addr + SOCK_PRESENT_STATE)))
 113                         break;
 114
 115                 msleep(cnt);
 116         }
 117
 118         writel(readl(sock_addr + SOCK_CONTROL) & (~TIFM_CTRL_LED),
 119                sock_addr + SOCK_CONTROL);
 120
 121         return (readl(sock_addr + SOCK_PRESENT_STATE) >> 4) & 7;
 122 }
 123
 124 inline static char __iomem *
 125 tifm_7xx1_sock_addr(char __iomem *base_addr, unsigned int sock_num)
 126 {
 127         return base_addr + ((sock_num + 1) << 10);
 128 }
 129
 130 static void tifm_7xx1_switch_media(struct work_struct *work)
 131 {
 132         struct tifm_adapter *fm = container_of(work, struct tifm_adapter,
 133                                                media_switcher);
 134         struct tifm_dev *sock;
 135         unsigned long flags;
 136         unsigned char media_id;
 137         unsigned int socket_change_set, cnt;
 138
 139         spin_lock_irqsave(&fm->lock, flags);
 140         socket_change_set = fm->socket_change_set;
 141         fm->socket_change_set = 0;
 142
 143         dev_dbg(fm->cdev.dev, "checking media set %x\n",
 144                 socket_change_set);
 145
 146         if (!socket_change_set) {
 147                 spin_unlock_irqrestore(&fm->lock, flags);
 148                 return;
 149         }
 150
 151         for (cnt = 0; cnt < fm->num_sockets; cnt++) {
 152                 if (!(socket_change_set & (1 << cnt)))
 153                         continue;
 154                 sock = fm->sockets[cnt];
 155                 if (sock) {
 156                         printk(KERN_INFO
 157                                "%s : demand removing card from socket %u:%u\n",
 158                                fm->cdev.class_id, fm->id, cnt);
 159                         fm->sockets[cnt] = NULL;
 160                         spin_unlock_irqrestore(&fm->lock, flags);
 161                         device_unregister(&sock->dev);
 162                         spin_lock_irqsave(&fm->lock, flags);
 163                         writel(0x0e00, tifm_7xx1_sock_addr(fm->addr, cnt)
 164                                + SOCK_CONTROL);
 165                 }
 166
 167                 spin_unlock_irqrestore(&fm->lock, flags);
 168
 169                 media_id = tifm_7xx1_toggle_sock_power(
 170                                 tifm_7xx1_sock_addr(fm->addr, cnt));
 171
 172                 // tifm_alloc_device will check if media_id is valid
 173                 sock = tifm_alloc_device(fm, cnt, media_id);
 174                 if (sock) {
 175                         sock->addr = tifm_7xx1_sock_addr(fm->addr, cnt);
 176
 177                         if (!device_register(&sock->dev)) {
 178                                 spin_lock_irqsave(&fm->lock, flags);
 179                                 if (!fm->sockets[cnt]) {
 180                                         fm->sockets[cnt] = sock;
 181                                         sock = NULL;
 182                                 }
 183                                 spin_unlock_irqrestore(&fm->lock, flags);
 184                         }
 185                         if (sock)
 186                                 tifm_free_device(&sock->dev);
 187                 }
 188                 spin_lock_irqsave(&fm->lock, flags);
 189         }
 190
 191         writel(TIFM_IRQ_FIFOMASK(socket_change_set)
 192                | TIFM_IRQ_CARDMASK(socket_change_set),
 193                fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 194
 195         writel(TIFM_IRQ_FIFOMASK(socket_change_set)
 196                | TIFM_IRQ_CARDMASK(socket_change_set),
 197                fm->addr + FM_SET_INTERRUPT_ENABLE);
 198
 199         writel(TIFM_IRQ_ENABLE, fm->addr + FM_SET_INTERRUPT_ENABLE);
 200         spin_unlock_irqrestore(&fm->lock, flags);
 201 }
 202
 203 #ifdef CONFIG_PM
 204
 205 static int tifm_7xx1_suspend(struct pci_dev *dev, pm_message_t state)
 206 {
 207         dev_dbg(&dev->dev, "suspending host\n");
 208
 209         pci_save_state(dev);
 210         pci_enable_wake(dev, pci_choose_state(dev, state), 0);
 211         pci_disable_device(dev);
 212         pci_set_power_state(dev, pci_choose_state(dev, state));
 213         return 0;
 214 }
 215
 216 static int tifm_7xx1_resume(struct pci_dev *dev)
 217 {
 218         struct tifm_adapter *fm = pci_get_drvdata(dev);
 219         int rc;
 220         unsigned int good_sockets = 0, bad_sockets = 0;
 221         unsigned long flags;
 222         unsigned char new_ids[fm->num_sockets];
 223         DECLARE_COMPLETION_ONSTACK(finish_resume);
 224
 225         pci_set_power_state(dev, PCI_D0);
 226         pci_restore_state(dev);
 227         rc = pci_enable_device(dev);
 228         if (rc)
 229                 return rc;
 230         pci_set_master(dev);
 231
 232         dev_dbg(&dev->dev, "resuming host\n");
 233
 234         for (rc = 0; rc < fm->num_sockets; rc++)
 235                 new_ids[rc] = tifm_7xx1_toggle_sock_power(
 236                                         tifm_7xx1_sock_addr(fm->addr, rc));
 237         spin_lock_irqsave(&fm->lock, flags);
 238         for (rc = 0; rc < fm->num_sockets; rc++) {
 239                 if (fm->sockets[rc]) {
 240                         if (fm->sockets[rc]->type == new_ids[rc])
 241                                 good_sockets |= 1 << rc;
 242                         else
 243                                 bad_sockets |= 1 << rc;
 244                 }
 245         }
 246
 247         writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
 248                fm->addr + FM_SET_INTERRUPT_ENABLE);
 249         dev_dbg(&dev->dev, "change sets on resume: good %x, bad %x\n",
 250                 good_sockets, bad_sockets);
 251
 252         fm->socket_change_set = 0;
 253         if (good_sockets) {
 254                 fm->finish_me = &finish_resume;
 255                 spin_unlock_irqrestore(&fm->lock, flags);
 256                 rc = wait_for_completion_timeout(&finish_resume, HZ);
 257                 dev_dbg(&dev->dev, "wait returned %d\n", rc);
 258                 writel(TIFM_IRQ_FIFOMASK(good_sockets)
 259                        | TIFM_IRQ_CARDMASK(good_sockets),
 260                        fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 261                 writel(TIFM_IRQ_FIFOMASK(good_sockets)
 262                        | TIFM_IRQ_CARDMASK(good_sockets),
 263                        fm->addr + FM_SET_INTERRUPT_ENABLE);
 264                 spin_lock_irqsave(&fm->lock, flags);
 265                 fm->finish_me = NULL;
 266                 fm->socket_change_set ^= good_sockets & fm->socket_change_set;
 267         }
 268
 269         fm->socket_change_set |= bad_sockets;
 270         if (fm->socket_change_set)
 271                 tifm_queue_work(&fm->media_switcher);
 272
 273         spin_unlock_irqrestore(&fm->lock, flags);
 274         writel(TIFM_IRQ_ENABLE,
 275                fm->addr + FM_SET_INTERRUPT_ENABLE);
 276
 277         return 0;
 278 }
 279
 280 #else
 281
 282 #define tifm_7xx1_suspend NULL
 283 #define tifm_7xx1_resume NULL
 284
 285 #endif /* CONFIG_PM */
 286
 287 static int tifm_7xx1_probe(struct pci_dev *dev,
 288                            const struct pci_device_id *dev_id)
 289 {
 290         struct tifm_adapter *fm;
 291         int pci_dev_busy = 0;
 292         int rc;
 293
 294         rc = pci_set_dma_mask(dev, DMA_32BIT_MASK);
 295         if (rc)
 296                 return rc;
 297
 298         rc = pci_enable_device(dev);
 299         if (rc)
 300                 return rc;
 301
 302         pci_set_master(dev);
 303
 304         rc = pci_request_regions(dev, DRIVER_NAME);
 305         if (rc) {
 306                 pci_dev_busy = 1;
 307                 goto err_out;
 308         }
 309
 310         pci_intx(dev, 1);
 311
 312         fm = tifm_alloc_adapter(dev->device == PCI_DEVICE_ID_TI_XX21_XX11_FM
 313                                 ? 4 : 2, &dev->dev);
 314         if (!fm) {
 315                 rc = -ENOMEM;
 316                 goto err_out_int;
 317         }
 318
 319         INIT_WORK(&fm->media_switcher, tifm_7xx1_switch_media);
 320         fm->eject = tifm_7xx1_eject;
 321         pci_set_drvdata(dev, fm);
 322
 323         fm->addr = ioremap(pci_resource_start(dev, 0),
 324                            pci_resource_len(dev, 0));
 325         if (!fm->addr)
 326                 goto err_out_free;
 327
 328         rc = request_irq(dev->irq, tifm_7xx1_isr, SA_SHIRQ, DRIVER_NAME, fm);
 329         if (rc)
 330                 goto err_out_unmap;
 331
 332         rc = tifm_add_adapter(fm);
 333         if (rc)
 334                 goto err_out_irq;
 335
 336         writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
 337                fm->addr + FM_SET_INTERRUPT_ENABLE);
 338         return 0;
 339
 340 err_out_irq:
 341         free_irq(dev->irq, fm);
 342 err_out_unmap:
 343         iounmap(fm->addr);
 344 err_out_free:
 345         pci_set_drvdata(dev, NULL);
 346         tifm_free_adapter(fm);
 347 err_out_int:
 348         pci_intx(dev, 0);
 349         pci_release_regions(dev);
 350 err_out:
 351         if (!pci_dev_busy)
 352                 pci_disable_device(dev);
 353         return rc;
 354 }
 355
 356 static void tifm_7xx1_remove(struct pci_dev *dev)
 357 {
 358         struct tifm_adapter *fm = pci_get_drvdata(dev);
 359
 360         fm->eject = tifm_7xx1_dummy_eject;
 361         writel(TIFM_IRQ_SETALL, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 362         mmiowb();
 363         free_irq(dev->irq, fm);
 364
 365         tifm_remove_adapter(fm);
 366
 367         pci_set_drvdata(dev, NULL);
 368
 369         iounmap(fm->addr);
 370         pci_intx(dev, 0);
 371         pci_release_regions(dev);
 372
 373         pci_disable_device(dev);
 374         tifm_free_adapter(fm);
 375 }
 376
 377 static struct pci_device_id tifm_7xx1_pci_tbl [] = {
 378         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX21_XX11_FM, PCI_ANY_ID,
 379           PCI_ANY_ID, 0, 0, 0 }, /* xx21 - the one I have */
 380         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX12_FM, PCI_ANY_ID,
 381           PCI_ANY_ID, 0, 0, 0 },
 382         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX20_FM, PCI_ANY_ID,
 383           PCI_ANY_ID, 0, 0, 0 },
 384         { }
 385 };
 386
 387 static struct pci_driver tifm_7xx1_driver = {
 388         .name = DRIVER_NAME,
 389         .id_table = tifm_7xx1_pci_tbl,
 390         .probe = tifm_7xx1_probe,
 391         .remove = tifm_7xx1_remove,
 392         .suspend = tifm_7xx1_suspend,
 393         .resume = tifm_7xx1_resume,
 394 };
 395
 396 static int __init tifm_7xx1_init(void)
 397 {
 398         return pci_register_driver(&tifm_7xx1_driver);
 399 }
 400
 401 static void __exit tifm_7xx1_exit(void)
 402 {
 403         pci_unregister_driver(&tifm_7xx1_driver);
 404 }
 405
 406 MODULE_AUTHOR("Alex Dubov");
 407 MODULE_DESCRIPTION("TI FlashMedia host driver");
 408 MODULE_LICENSE("GPL");
 409 MODULE_DEVICE_TABLE(pci, tifm_7xx1_pci_tbl);
 410 MODULE_VERSION(DRIVER_VERSION);
 411
 412 module_init(tifm_7xx1_init);
 413 module_exit(tifm_7xx1_exit);