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/module.h>
  15
  16 #define DRIVER_NAME "tifm_7xx1"
  17 #define DRIVER_VERSION "0.8"
  18
  19 #define TIFM_IRQ_ENABLE           0x80000000
  20 #define TIFM_IRQ_SOCKMASK(x)      (x)
  21 #define TIFM_IRQ_CARDMASK(x)      ((x) << 8)
  22 #define TIFM_IRQ_FIFOMASK(x)      ((x) << 16)
  23 #define TIFM_IRQ_SETALL           0xffffffff
  24
  25 static void tifm_7xx1_dummy_eject(struct tifm_adapter *fm,
  26                                   struct tifm_dev *sock)
  27 {
  28 }
  29
  30 static void tifm_7xx1_eject(struct tifm_adapter *fm, struct tifm_dev *sock)
  31 {
  32         unsigned long flags;
  33
  34         spin_lock_irqsave(&fm->lock, flags);
  35         fm->socket_change_set |= 1 << sock->socket_id;
  36         tifm_queue_work(&fm->media_switcher);
  37         spin_unlock_irqrestore(&fm->lock, flags);
  38 }
  39
  40 static irqreturn_t tifm_7xx1_isr(int irq, void *dev_id)
  41 {
  42         struct tifm_adapter *fm = dev_id;
  43         struct tifm_dev *sock;
  44         unsigned int irq_status, cnt;
  45
  46         spin_lock(&fm->lock);
  47         irq_status = readl(fm->addr + FM_INTERRUPT_STATUS);
  48         if (irq_status == 0 || irq_status == (~0)) {
  49                 spin_unlock(&fm->lock);
  50                 return IRQ_NONE;
  51         }
  52
  53         if (irq_status & TIFM_IRQ_ENABLE) {
  54                 writel(TIFM_IRQ_ENABLE, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
  55
  56                 for (cnt = 0; cnt < fm->num_sockets; cnt++) {
  57                         sock = fm->sockets[cnt];
  58                         if (sock) {
  59                                 if ((irq_status >> cnt) & TIFM_IRQ_FIFOMASK(1))
  60                                         sock->data_event(sock);
  61                                 if ((irq_status >> cnt) & TIFM_IRQ_CARDMASK(1))
  62                                         sock->card_event(sock);
  63                         }
  64                 }
  65
  66                 fm->socket_change_set |= irq_status
  67                                          & ((1 << fm->num_sockets) - 1);
  68         }
  69         writel(irq_status, fm->addr + FM_INTERRUPT_STATUS);
  70
  71         if (fm->finish_me)
  72                 complete_all(fm->finish_me);
  73         else if (!fm->socket_change_set)
  74                 writel(TIFM_IRQ_ENABLE, fm->addr + FM_SET_INTERRUPT_ENABLE);
  75         else
  76                 tifm_queue_work(&fm->media_switcher);
  77
  78         spin_unlock(&fm->lock);
  79         return IRQ_HANDLED;
  80 }
  81
  82 static unsigned char tifm_7xx1_toggle_sock_power(char __iomem *sock_addr)
  83 {
  84         unsigned int s_state;
  85         int cnt;
  86
  87         writel(0x0e00, sock_addr + SOCK_CONTROL);
  88
  89         for (cnt = 16; cnt <= 256; cnt <<= 1) {
  90                 if (!(TIFM_SOCK_STATE_POWERED
  91                       & readl(sock_addr + SOCK_PRESENT_STATE)))
  92                         break;
  93
  94                 msleep(cnt);
  95         }
  96
  97         s_state = readl(sock_addr + SOCK_PRESENT_STATE);
  98         if (!(TIFM_SOCK_STATE_OCCUPIED & s_state))
  99                 return 0;
 100
 101         writel(readl(sock_addr + SOCK_CONTROL) | TIFM_CTRL_LED,
 102                sock_addr + SOCK_CONTROL);
 103
 104         /* xd needs some extra time before power on */
 105         if (((readl(sock_addr + SOCK_PRESENT_STATE) >> 4) & 7)
 106             == TIFM_TYPE_XD)
 107                 msleep(40);
 108
 109         writel((s_state & TIFM_CTRL_POWER_MASK) | 0x0c00,
 110                sock_addr + SOCK_CONTROL);
 111         /* wait for power to stabilize */
 112         msleep(20);
 113         for (cnt = 16; cnt <= 256; cnt <<= 1) {
 114                 if ((TIFM_SOCK_STATE_POWERED
 115                      & readl(sock_addr + SOCK_PRESENT_STATE)))
 116                         break;
 117
 118                 msleep(cnt);
 119         }
 120
 121         writel(readl(sock_addr + SOCK_CONTROL) & (~TIFM_CTRL_LED),
 122                sock_addr + SOCK_CONTROL);
 123
 124         return (readl(sock_addr + SOCK_PRESENT_STATE) >> 4) & 7;
 125 }
 126
 127 inline static void tifm_7xx1_sock_power_off(char __iomem *sock_addr)
 128 {
 129         writel((~TIFM_CTRL_POWER_MASK) & readl(sock_addr + SOCK_CONTROL),
 130                sock_addr + SOCK_CONTROL);
 131 }
 132
 133 inline static char __iomem *
 134 tifm_7xx1_sock_addr(char __iomem *base_addr, unsigned int sock_num)
 135 {
 136         return base_addr + ((sock_num + 1) << 10);
 137 }
 138
 139 static void tifm_7xx1_switch_media(struct work_struct *work)
 140 {
 141         struct tifm_adapter *fm = container_of(work, struct tifm_adapter,
 142                                                media_switcher);
 143         struct tifm_dev *sock;
 144         char __iomem *sock_addr;
 145         unsigned long flags;
 146         unsigned char media_id;
 147         unsigned int socket_change_set, cnt;
 148
 149         spin_lock_irqsave(&fm->lock, flags);
 150         socket_change_set = fm->socket_change_set;
 151         fm->socket_change_set = 0;
 152
 153         dev_dbg(fm->dev.parent, "checking media set %x\n",
 154                 socket_change_set);
 155
 156         if (!socket_change_set) {
 157                 spin_unlock_irqrestore(&fm->lock, flags);
 158                 return;
 159         }
 160
 161         for (cnt = 0; cnt < fm->num_sockets; cnt++) {
 162                 if (!(socket_change_set & (1 << cnt)))
 163                         continue;
 164                 sock = fm->sockets[cnt];
 165                 if (sock) {
 166                         printk(KERN_INFO
 167                                "%s : demand removing card from socket %u:%u\n",
 168                                dev_name(&fm->dev), fm->id, cnt);
 169                         fm->sockets[cnt] = NULL;
 170                         sock_addr = sock->addr;
 171                         spin_unlock_irqrestore(&fm->lock, flags);
 172                         device_unregister(&sock->dev);
 173                         spin_lock_irqsave(&fm->lock, flags);
 174                         tifm_7xx1_sock_power_off(sock_addr);
 175                         writel(0x0e00, sock_addr + SOCK_CONTROL);
 176                 }
 177
 178                 spin_unlock_irqrestore(&fm->lock, flags);
 179
 180                 media_id = tifm_7xx1_toggle_sock_power(
 181                                 tifm_7xx1_sock_addr(fm->addr, cnt));
 182
 183                 // tifm_alloc_device will check if media_id is valid
 184                 sock = tifm_alloc_device(fm, cnt, media_id);
 185                 if (sock) {
 186                         sock->addr = tifm_7xx1_sock_addr(fm->addr, cnt);
 187
 188                         if (!device_register(&sock->dev)) {
 189                                 spin_lock_irqsave(&fm->lock, flags);
 190                                 if (!fm->sockets[cnt]) {
 191                                         fm->sockets[cnt] = sock;
 192                                         sock = NULL;
 193                                 }
 194                                 spin_unlock_irqrestore(&fm->lock, flags);
 195                         }
 196                         if (sock)
 197                                 tifm_free_device(&sock->dev);
 198                 }
 199                 spin_lock_irqsave(&fm->lock, flags);
 200         }
 201
 202         writel(TIFM_IRQ_FIFOMASK(socket_change_set)
 203                | TIFM_IRQ_CARDMASK(socket_change_set),
 204                fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 205
 206         writel(TIFM_IRQ_FIFOMASK(socket_change_set)
 207                | TIFM_IRQ_CARDMASK(socket_change_set),
 208                fm->addr + FM_SET_INTERRUPT_ENABLE);
 209
 210         writel(TIFM_IRQ_ENABLE, fm->addr + FM_SET_INTERRUPT_ENABLE);
 211         spin_unlock_irqrestore(&fm->lock, flags);
 212 }
 213
 214 #ifdef CONFIG_PM
 215
 216 static int tifm_7xx1_suspend(struct pci_dev *dev, pm_message_t state)
 217 {
 218         struct tifm_adapter *fm = pci_get_drvdata(dev);
 219         int cnt;
 220
 221         dev_dbg(&dev->dev, "suspending host\n");
 222
 223         for (cnt = 0; cnt < fm->num_sockets; cnt++) {
 224                 if (fm->sockets[cnt])
 225                         tifm_7xx1_sock_power_off(fm->sockets[cnt]->addr);
 226         }
 227
 228         pci_save_state(dev);
 229         pci_enable_wake(dev, pci_choose_state(dev, state), 0);
 230         pci_disable_device(dev);
 231         pci_set_power_state(dev, pci_choose_state(dev, state));
 232         return 0;
 233 }
 234
 235 static int tifm_7xx1_resume(struct pci_dev *dev)
 236 {
 237         struct tifm_adapter *fm = pci_get_drvdata(dev);
 238         int rc;
 239         unsigned long timeout;
 240         unsigned int good_sockets = 0, bad_sockets = 0;
 241         unsigned long flags;
 242         /* Maximum number of entries is 4 */
 243         unsigned char new_ids[4];
 244         DECLARE_COMPLETION_ONSTACK(finish_resume);
 245
 246         if (WARN_ON(fm->num_sockets > ARRAY_SIZE(new_ids)))
 247                 return -ENXIO;
 248
 249         pci_set_power_state(dev, PCI_D0);
 250         pci_restore_state(dev);
 251         rc = pci_enable_device(dev);
 252         if (rc)
 253                 return rc;
 254         pci_set_master(dev);
 255
 256         dev_dbg(&dev->dev, "resuming host\n");
 257
 258         for (rc = 0; rc < fm->num_sockets; rc++)
 259                 new_ids[rc] = tifm_7xx1_toggle_sock_power(
 260                                         tifm_7xx1_sock_addr(fm->addr, rc));
 261         spin_lock_irqsave(&fm->lock, flags);
 262         for (rc = 0; rc < fm->num_sockets; rc++) {
 263                 if (fm->sockets[rc]) {
 264                         if (fm->sockets[rc]->type == new_ids[rc])
 265                                 good_sockets |= 1 << rc;
 266                         else
 267                                 bad_sockets |= 1 << rc;
 268                 }
 269         }
 270
 271         writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
 272                fm->addr + FM_SET_INTERRUPT_ENABLE);
 273         dev_dbg(&dev->dev, "change sets on resume: good %x, bad %x\n",
 274                 good_sockets, bad_sockets);
 275
 276         fm->socket_change_set = 0;
 277         if (good_sockets) {
 278                 fm->finish_me = &finish_resume;
 279                 spin_unlock_irqrestore(&fm->lock, flags);
 280                 timeout = wait_for_completion_timeout(&finish_resume, HZ);
 281                 dev_dbg(&dev->dev, "wait returned %lu\n", timeout);
 282                 writel(TIFM_IRQ_FIFOMASK(good_sockets)
 283                        | TIFM_IRQ_CARDMASK(good_sockets),
 284                        fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 285                 writel(TIFM_IRQ_FIFOMASK(good_sockets)
 286                        | TIFM_IRQ_CARDMASK(good_sockets),
 287                        fm->addr + FM_SET_INTERRUPT_ENABLE);
 288                 spin_lock_irqsave(&fm->lock, flags);
 289                 fm->finish_me = NULL;
 290                 fm->socket_change_set ^= good_sockets & fm->socket_change_set;
 291         }
 292
 293         fm->socket_change_set |= bad_sockets;
 294         if (fm->socket_change_set)
 295                 tifm_queue_work(&fm->media_switcher);
 296
 297         spin_unlock_irqrestore(&fm->lock, flags);
 298         writel(TIFM_IRQ_ENABLE,
 299                fm->addr + FM_SET_INTERRUPT_ENABLE);
 300
 301         return 0;
 302 }
 303
 304 #else
 305
 306 #define tifm_7xx1_suspend NULL
 307 #define tifm_7xx1_resume NULL
 308
 309 #endif /* CONFIG_PM */
 310
 311 static int tifm_7xx1_dummy_has_ms_pif(struct tifm_adapter *fm,
 312                                       struct tifm_dev *sock)
 313 {
 314         return 0;
 315 }
 316
 317 static int tifm_7xx1_has_ms_pif(struct tifm_adapter *fm, struct tifm_dev *sock)
 318 {
 319         if (((fm->num_sockets == 4) && (sock->socket_id == 2))
 320             || ((fm->num_sockets == 2) && (sock->socket_id == 0)))
 321                 return 1;
 322
 323         return 0;
 324 }
 325
 326 static int tifm_7xx1_probe(struct pci_dev *dev,
 327                            const struct pci_device_id *dev_id)
 328 {
 329         struct tifm_adapter *fm;
 330         int pci_dev_busy = 0;
 331         int rc;
 332
 333         rc = pci_set_dma_mask(dev, DMA_BIT_MASK(32));
 334         if (rc)
 335                 return rc;
 336
 337         rc = pci_enable_device(dev);
 338         if (rc)
 339                 return rc;
 340
 341         pci_set_master(dev);
 342
 343         rc = pci_request_regions(dev, DRIVER_NAME);
 344         if (rc) {
 345                 pci_dev_busy = 1;
 346                 goto err_out;
 347         }
 348
 349         pci_intx(dev, 1);
 350
 351         fm = tifm_alloc_adapter(dev->device == PCI_DEVICE_ID_TI_XX21_XX11_FM
 352                                 ? 4 : 2, &dev->dev);
 353         if (!fm) {
 354                 rc = -ENOMEM;
 355                 goto err_out_int;
 356         }
 357
 358         INIT_WORK(&fm->media_switcher, tifm_7xx1_switch_media);
 359         fm->eject = tifm_7xx1_eject;
 360         fm->has_ms_pif = tifm_7xx1_has_ms_pif;
 361         pci_set_drvdata(dev, fm);
 362
 363         fm->addr = pci_ioremap_bar(dev, 0);
 364         if (!fm->addr) {
 365                 rc = -ENODEV;
 366                 goto err_out_free;
 367         }
 368
 369         rc = request_irq(dev->irq, tifm_7xx1_isr, IRQF_SHARED, DRIVER_NAME, fm);
 370         if (rc)
 371                 goto err_out_unmap;
 372
 373         rc = tifm_add_adapter(fm);
 374         if (rc)
 375                 goto err_out_irq;
 376
 377         writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
 378                fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 379         writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
 380                fm->addr + FM_SET_INTERRUPT_ENABLE);
 381         return 0;
 382
 383 err_out_irq:
 384         free_irq(dev->irq, fm);
 385 err_out_unmap:
 386         iounmap(fm->addr);
 387 err_out_free:
 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         int cnt;
 402
 403         fm->eject = tifm_7xx1_dummy_eject;
 404         fm->has_ms_pif = tifm_7xx1_dummy_has_ms_pif;
 405         writel(TIFM_IRQ_SETALL, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 406         free_irq(dev->irq, fm);
 407
 408         tifm_remove_adapter(fm);
 409
 410         for (cnt = 0; cnt < fm->num_sockets; cnt++)
 411                 tifm_7xx1_sock_power_off(tifm_7xx1_sock_addr(fm->addr, cnt));
 412
 413         iounmap(fm->addr);
 414         pci_intx(dev, 0);
 415         pci_release_regions(dev);
 416
 417         pci_disable_device(dev);
 418         tifm_free_adapter(fm);
 419 }
 420
 421 static const struct pci_device_id tifm_7xx1_pci_tbl[] = {
 422         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX21_XX11_FM, PCI_ANY_ID,
 423           PCI_ANY_ID, 0, 0, 0 }, /* xx21 - the one I have */
 424         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX12_FM, PCI_ANY_ID,
 425           PCI_ANY_ID, 0, 0, 0 },
 426         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX20_FM, PCI_ANY_ID,
 427           PCI_ANY_ID, 0, 0, 0 },
 428         { }
 429 };
 430
 431 static struct pci_driver tifm_7xx1_driver = {
 432         .name = DRIVER_NAME,
 433         .id_table = tifm_7xx1_pci_tbl,
 434         .probe = tifm_7xx1_probe,
 435         .remove = tifm_7xx1_remove,
 436         .suspend = tifm_7xx1_suspend,
 437         .resume = tifm_7xx1_resume,
 438 };
 439
 440 module_pci_driver(tifm_7xx1_driver);
 441 MODULE_AUTHOR("Alex Dubov");
 442 MODULE_DESCRIPTION("TI FlashMedia host driver");
 443 MODULE_LICENSE("GPL");
 444 MODULE_DEVICE_TABLE(pci, tifm_7xx1_pci_tbl);
 445 MODULE_VERSION(DRIVER_VERSION);