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 #include <linux/dma-mapping.h>
  14 #include <linux/freezer.h>
  15
  16 #define DRIVER_NAME "tifm_7xx1"
  17 #define DRIVER_VERSION "0.7"
  18
  19 static void tifm_7xx1_eject(struct tifm_adapter *fm, struct tifm_dev *sock)
  20 {
  21         unsigned long flags;
  22
  23         spin_lock_irqsave(&fm->lock, flags);
  24         fm->socket_change_set |= 1 << sock->socket_id;
  25         wake_up_all(&fm->change_set_notify);
  26         spin_unlock_irqrestore(&fm->lock, flags);
  27 }
  28
  29 static irqreturn_t tifm_7xx1_isr(int irq, void *dev_id)
  30 {
  31         struct tifm_adapter *fm = dev_id;
  32         struct tifm_dev *sock;
  33         unsigned int irq_status;
  34         unsigned int sock_irq_status, cnt;
  35
  36         spin_lock(&fm->lock);
  37         irq_status = readl(fm->addr + FM_INTERRUPT_STATUS);
  38         if (irq_status == 0 || irq_status == (~0)) {
  39                 spin_unlock(&fm->lock);
  40                 return IRQ_NONE;
  41         }
  42
  43         if (irq_status & TIFM_IRQ_ENABLE) {
  44                 writel(TIFM_IRQ_ENABLE, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
  45
  46                 for (cnt = 0; cnt <  fm->num_sockets; cnt++) {
  47                         sock = fm->sockets[cnt];
  48                         sock_irq_status = (irq_status >> cnt)
  49                                           & (TIFM_IRQ_FIFOMASK(1)
  50                                              | TIFM_IRQ_CARDMASK(1));
  51
  52                         if (sock && sock_irq_status)
  53                                 sock->signal_irq(sock, sock_irq_status);
  54                 }
  55
  56                  fm->socket_change_set |= irq_status
  57                                           & ((1 << fm->num_sockets) - 1);
  58         }
  59         writel(irq_status, fm->addr + FM_INTERRUPT_STATUS);
  60
  61         if (!fm->socket_change_set)
  62                 writel(TIFM_IRQ_ENABLE, fm->addr + FM_SET_INTERRUPT_ENABLE);
  63         else
  64                 wake_up_all(&fm->change_set_notify);
  65
  66         spin_unlock(&fm->lock);
  67         return IRQ_HANDLED;
  68 }
  69
  70 static tifm_media_id tifm_7xx1_toggle_sock_power(char __iomem *sock_addr, int is_x2)
  71 {
  72         unsigned int s_state;
  73         int cnt;
  74
  75         writel(0x0e00, sock_addr + SOCK_CONTROL);
  76
  77         for (cnt = 0; cnt < 100; cnt++) {
  78                 if (!(TIFM_SOCK_STATE_POWERED &
  79                                 readl(sock_addr + SOCK_PRESENT_STATE)))
  80                         break;
  81                 msleep(10);
  82         }
  83
  84         s_state = readl(sock_addr + SOCK_PRESENT_STATE);
  85         if (!(TIFM_SOCK_STATE_OCCUPIED & s_state))
  86                 return FM_NULL;
  87
  88         if (is_x2) {
  89                 writel((s_state & 7) | 0x0c00, sock_addr + SOCK_CONTROL);
  90         } else {
  91                 // SmartMedia cards need extra 40 msec
  92                 if (((readl(sock_addr + SOCK_PRESENT_STATE) >> 4) & 7) == 1)
  93                         msleep(40);
  94                 writel(readl(sock_addr + SOCK_CONTROL) | TIFM_CTRL_LED,
  95                        sock_addr + SOCK_CONTROL);
  96                 msleep(10);
  97                 writel((s_state & 0x7) | 0x0c00 | TIFM_CTRL_LED,
  98                         sock_addr + SOCK_CONTROL);
  99         }
 100
 101         for (cnt = 0; cnt < 100; cnt++) {
 102                 if ((TIFM_SOCK_STATE_POWERED &
 103                                 readl(sock_addr + SOCK_PRESENT_STATE)))
 104                         break;
 105                 msleep(10);
 106         }
 107
 108         if (!is_x2)
 109                 writel(readl(sock_addr + SOCK_CONTROL) & (~TIFM_CTRL_LED),
 110                        sock_addr + SOCK_CONTROL);
 111
 112         return (readl(sock_addr + SOCK_PRESENT_STATE) >> 4) & 7;
 113 }
 114
 115 inline static char __iomem *
 116 tifm_7xx1_sock_addr(char __iomem *base_addr, unsigned int sock_num)
 117 {
 118         return base_addr + ((sock_num + 1) << 10);
 119 }
 120
 121 static int tifm_7xx1_switch_media(void *data)
 122 {
 123         struct tifm_adapter *fm = data;
 124         unsigned long flags;
 125         tifm_media_id media_id;
 126         char *card_name = "xx";
 127         int cnt, rc;
 128         struct tifm_dev *sock;
 129         unsigned int socket_change_set;
 130
 131         while (1) {
 132                 rc = wait_event_interruptible(fm->change_set_notify,
 133                                               fm->socket_change_set);
 134                 if (rc == -ERESTARTSYS)
 135                         try_to_freeze();
 136
 137                 spin_lock_irqsave(&fm->lock, flags);
 138                 socket_change_set = fm->socket_change_set;
 139                 fm->socket_change_set = 0;
 140
 141                 dev_dbg(fm->dev, "checking media set %x\n",
 142                         socket_change_set);
 143
 144                 if (kthread_should_stop())
 145                         socket_change_set = (1 << fm->num_sockets) - 1;
 146                 spin_unlock_irqrestore(&fm->lock, flags);
 147
 148                 if (!socket_change_set)
 149                         continue;
 150
 151                 spin_lock_irqsave(&fm->lock, flags);
 152                 for (cnt = 0; cnt < fm->num_sockets; cnt++) {
 153                         if (!(socket_change_set & (1 << cnt)))
 154                                 continue;
 155                         sock = fm->sockets[cnt];
 156                         if (sock) {
 157                                 printk(KERN_INFO DRIVER_NAME
 158                                        ": demand removing card from socket %d\n",
 159                                        cnt);
 160                                 fm->sockets[cnt] = NULL;
 161                                 spin_unlock_irqrestore(&fm->lock, flags);
 162                                 device_unregister(&sock->dev);
 163                                 spin_lock_irqsave(&fm->lock, flags);
 164                                 writel(0x0e00,
 165                                        tifm_7xx1_sock_addr(fm->addr, cnt)
 166                                        + SOCK_CONTROL);
 167                         }
 168                         if (kthread_should_stop())
 169                                 continue;
 170
 171                         spin_unlock_irqrestore(&fm->lock, flags);
 172                         media_id = tifm_7xx1_toggle_sock_power(
 173                                         tifm_7xx1_sock_addr(fm->addr, cnt),
 174                                         fm->num_sockets == 2);
 175                         if (media_id) {
 176                                 sock = tifm_alloc_device(fm);
 177                                 if (sock) {
 178                                         sock->addr = tifm_7xx1_sock_addr(fm->addr,
 179                                                                         cnt);
 180                                         sock->media_id = media_id;
 181                                         sock->socket_id = cnt;
 182                                         switch (media_id) {
 183                                         case 1:
 184                                                 card_name = "xd";
 185                                                 break;
 186                                         case 2:
 187                                                 card_name = "ms";
 188                                                 break;
 189                                         case 3:
 190                                                 card_name = "sd";
 191                                                 break;
 192                                         default:
 193                                                 tifm_free_device(&sock->dev);
 194                                                 spin_lock_irqsave(&fm->lock, flags);
 195                                                 continue;
 196                                         }
 197                                         snprintf(sock->dev.bus_id, BUS_ID_SIZE,
 198                                                 "tifm_%s%u:%u", card_name, fm->id, cnt);
 199                                         printk(KERN_INFO DRIVER_NAME
 200                                                 ": %s card detected in socket %d\n",
 201                                                 card_name, cnt);
 202                                         if (!device_register(&sock->dev)) {
 203                                                 spin_lock_irqsave(&fm->lock, flags);
 204                                                 if (!fm->sockets[cnt]) {
 205                                                         fm->sockets[cnt] = sock;
 206                                                         sock = NULL;
 207                                                 }
 208                                                 spin_unlock_irqrestore(&fm->lock, flags);
 209                                         }
 210                                         if (sock)
 211                                                 tifm_free_device(&sock->dev);
 212                                 }
 213                                 spin_lock_irqsave(&fm->lock, flags);
 214                         }
 215                 }
 216
 217                 if (!kthread_should_stop()) {
 218                         writel(TIFM_IRQ_FIFOMASK(socket_change_set)
 219                                | TIFM_IRQ_CARDMASK(socket_change_set),
 220                                fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 221                         writel(TIFM_IRQ_FIFOMASK(socket_change_set)
 222                                | TIFM_IRQ_CARDMASK(socket_change_set),
 223                                fm->addr + FM_SET_INTERRUPT_ENABLE);
 224                         writel(TIFM_IRQ_ENABLE,
 225                                fm->addr + FM_SET_INTERRUPT_ENABLE);
 226                         spin_unlock_irqrestore(&fm->lock, flags);
 227                 } else {
 228                         for (cnt = 0; cnt < fm->num_sockets; cnt++) {
 229                                 if (fm->sockets[cnt])
 230                                         fm->socket_change_set |= 1 << cnt;
 231                         }
 232                         if (!fm->socket_change_set) {
 233                                 spin_unlock_irqrestore(&fm->lock, flags);
 234                                 return 0;
 235                         } else {
 236                                 spin_unlock_irqrestore(&fm->lock, flags);
 237                         }
 238                 }
 239         }
 240         return 0;
 241 }
 242
 243 #ifdef CONFIG_PM
 244
 245 static int tifm_7xx1_suspend(struct pci_dev *dev, pm_message_t state)
 246 {
 247         dev_dbg(&dev->dev, "suspending host\n");
 248
 249         pci_save_state(dev);
 250         pci_enable_wake(dev, pci_choose_state(dev, state), 0);
 251         pci_disable_device(dev);
 252         pci_set_power_state(dev, pci_choose_state(dev, state));
 253         return 0;
 254 }
 255
 256 static int tifm_7xx1_resume(struct pci_dev *dev)
 257 {
 258         struct tifm_adapter *fm = pci_get_drvdata(dev);
 259         int cnt, rc;
 260         unsigned long flags;
 261         tifm_media_id new_ids[fm->num_sockets];
 262
 263         pci_set_power_state(dev, PCI_D0);
 264         pci_restore_state(dev);
 265         rc = pci_enable_device(dev);
 266         if (rc)
 267                 return rc;
 268         pci_set_master(dev);
 269
 270         dev_dbg(&dev->dev, "resuming host\n");
 271
 272         for (cnt = 0; cnt < fm->num_sockets; cnt++)
 273                 new_ids[cnt] = tifm_7xx1_toggle_sock_power(
 274                                         tifm_7xx1_sock_addr(fm->addr, cnt),
 275                                         fm->num_sockets == 2);
 276         spin_lock_irqsave(&fm->lock, flags);
 277         fm->socket_change_set = 0;
 278         for (cnt = 0; cnt < fm->num_sockets; cnt++) {
 279                 if (fm->sockets[cnt]) {
 280                         if (fm->sockets[cnt]->media_id == new_ids[cnt])
 281                                 fm->socket_change_set |= 1 << cnt;
 282
 283                         fm->sockets[cnt]->media_id = new_ids[cnt];
 284                 }
 285         }
 286
 287         writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
 288                fm->addr + FM_SET_INTERRUPT_ENABLE);
 289         if (!fm->socket_change_set) {
 290                 spin_unlock_irqrestore(&fm->lock, flags);
 291                 return 0;
 292         } else {
 293                 fm->socket_change_set = 0;
 294                 spin_unlock_irqrestore(&fm->lock, flags);
 295         }
 296
 297         wait_event_timeout(fm->change_set_notify, fm->socket_change_set, HZ);
 298
 299         spin_lock_irqsave(&fm->lock, flags);
 300         writel(TIFM_IRQ_FIFOMASK(fm->socket_change_set)
 301                | TIFM_IRQ_CARDMASK(fm->socket_change_set),
 302                fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 303         writel(TIFM_IRQ_FIFOMASK(fm->socket_change_set)
 304                | TIFM_IRQ_CARDMASK(fm->socket_change_set),
 305                fm->addr + FM_SET_INTERRUPT_ENABLE);
 306         writel(TIFM_IRQ_ENABLE,
 307                fm->addr + FM_SET_INTERRUPT_ENABLE);
 308         fm->socket_change_set = 0;
 309
 310         spin_unlock_irqrestore(&fm->lock, flags);
 311         return 0;
 312 }
 313
 314 #else
 315
 316 #define tifm_7xx1_suspend NULL
 317 #define tifm_7xx1_resume NULL
 318
 319 #endif /* CONFIG_PM */
 320
 321 static int tifm_7xx1_probe(struct pci_dev *dev,
 322                         const struct pci_device_id *dev_id)
 323 {
 324         struct tifm_adapter *fm;
 325         int pci_dev_busy = 0;
 326         int rc;
 327
 328         rc = pci_set_dma_mask(dev, DMA_32BIT_MASK);
 329         if (rc)
 330                 return rc;
 331
 332         rc = pci_enable_device(dev);
 333         if (rc)
 334                 return rc;
 335
 336         pci_set_master(dev);
 337
 338         rc = pci_request_regions(dev, DRIVER_NAME);
 339         if (rc) {
 340                 pci_dev_busy = 1;
 341                 goto err_out;
 342         }
 343
 344         pci_intx(dev, 1);
 345
 346         fm = tifm_alloc_adapter();
 347         if (!fm) {
 348                 rc = -ENOMEM;
 349                 goto err_out_int;
 350         }
 351
 352         fm->dev = &dev->dev;
 353         fm->num_sockets = (dev->device == 0x803B) ? 2 : 4;
 354         fm->sockets = kzalloc(sizeof(struct tifm_dev*) * fm->num_sockets,
 355                                 GFP_KERNEL);
 356         if (!fm->sockets)
 357                 goto err_out_free;
 358
 359         fm->eject = tifm_7xx1_eject;
 360         pci_set_drvdata(dev, fm);
 361
 362         fm->addr = ioremap(pci_resource_start(dev, 0),
 363                                 pci_resource_len(dev, 0));
 364         if (!fm->addr)
 365                 goto err_out_free;
 366
 367         rc = request_irq(dev->irq, tifm_7xx1_isr, SA_SHIRQ, DRIVER_NAME, fm);
 368         if (rc)
 369                 goto err_out_unmap;
 370
 371         init_waitqueue_head(&fm->change_set_notify);
 372         rc = tifm_add_adapter(fm, tifm_7xx1_switch_media);
 373         if (rc)
 374                 goto err_out_irq;
 375
 376         writel(TIFM_IRQ_SETALL, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 377         writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
 378                 fm->addr + FM_SET_INTERRUPT_ENABLE);
 379         wake_up_process(fm->media_switcher);
 380         return 0;
 381
 382 err_out_irq:
 383         free_irq(dev->irq, fm);
 384 err_out_unmap:
 385         iounmap(fm->addr);
 386 err_out_free:
 387         pci_set_drvdata(dev, NULL);
 388         tifm_free_adapter(fm);
 389 err_out_int:
 390         pci_intx(dev, 0);
 391         pci_release_regions(dev);
 392 err_out:
 393         if (!pci_dev_busy)
 394                 pci_disable_device(dev);
 395         return rc;
 396 }
 397
 398 static void tifm_7xx1_remove(struct pci_dev *dev)
 399 {
 400         struct tifm_adapter *fm = pci_get_drvdata(dev);
 401         unsigned long flags;
 402
 403         writel(TIFM_IRQ_SETALL, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 404         mmiowb();
 405         free_irq(dev->irq, fm);
 406
 407         spin_lock_irqsave(&fm->lock, flags);
 408         fm->socket_change_set = (1 << fm->num_sockets) - 1;
 409         spin_unlock_irqrestore(&fm->lock, flags);
 410
 411         kthread_stop(fm->media_switcher);
 412
 413         tifm_remove_adapter(fm);
 414
 415         pci_set_drvdata(dev, NULL);
 416
 417         iounmap(fm->addr);
 418         pci_intx(dev, 0);
 419         pci_release_regions(dev);
 420
 421         pci_disable_device(dev);
 422         tifm_free_adapter(fm);
 423 }
 424
 425 static struct pci_device_id tifm_7xx1_pci_tbl [] = {
 426         { PCI_VENDOR_ID_TI, 0x8033, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 427           0 }, /* xx21 - the one I have */
 428         { PCI_VENDOR_ID_TI, 0x803B, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 429           0 }, /* xx12 - should be also supported */
 430         { }
 431 };
 432
 433 static struct pci_driver tifm_7xx1_driver = {
 434         .name = DRIVER_NAME,
 435         .id_table = tifm_7xx1_pci_tbl,
 436         .probe = tifm_7xx1_probe,
 437         .remove = tifm_7xx1_remove,
 438         .suspend = tifm_7xx1_suspend,
 439         .resume = tifm_7xx1_resume,
 440 };
 441
 442 static int __init tifm_7xx1_init(void)
 443 {
 444         return pci_register_driver(&tifm_7xx1_driver);
 445 }
 446
 447 static void __exit tifm_7xx1_exit(void)
 448 {
 449         pci_unregister_driver(&tifm_7xx1_driver);
 450 }
 451
 452 MODULE_AUTHOR("Alex Dubov");
 453 MODULE_DESCRIPTION("TI FlashMedia host driver");
 454 MODULE_LICENSE("GPL");
 455 MODULE_DEVICE_TABLE(pci, tifm_7xx1_pci_tbl);
 456 MODULE_VERSION(DRIVER_VERSION);
 457
 458 module_init(tifm_7xx1_init);
 459 module_exit(tifm_7xx1_exit);