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 int good_sockets = 0, bad_sockets = 0;
 240         unsigned long flags;
 241         unsigned char new_ids[fm->num_sockets];
 242         DECLARE_COMPLETION_ONSTACK(finish_resume);
 243
 244         pci_set_power_state(dev, PCI_D0);
 245         pci_restore_state(dev);
 246         rc = pci_enable_device(dev);
 247         if (rc)
 248                 return rc;
 249         pci_set_master(dev);
 250
 251         dev_dbg(&dev->dev, "resuming host\n");
 252
 253         for (rc = 0; rc < fm->num_sockets; rc++)
 254                 new_ids[rc] = tifm_7xx1_toggle_sock_power(
 255                                         tifm_7xx1_sock_addr(fm->addr, rc));
 256         spin_lock_irqsave(&fm->lock, flags);
 257         for (rc = 0; rc < fm->num_sockets; rc++) {
 258                 if (fm->sockets[rc]) {
 259                         if (fm->sockets[rc]->type == new_ids[rc])
 260                                 good_sockets |= 1 << rc;
 261                         else
 262                                 bad_sockets |= 1 << rc;
 263                 }
 264         }
 265
 266         writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
 267                fm->addr + FM_SET_INTERRUPT_ENABLE);
 268         dev_dbg(&dev->dev, "change sets on resume: good %x, bad %x\n",
 269                 good_sockets, bad_sockets);
 270
 271         fm->socket_change_set = 0;
 272         if (good_sockets) {
 273                 fm->finish_me = &finish_resume;
 274                 spin_unlock_irqrestore(&fm->lock, flags);
 275                 rc = wait_for_completion_timeout(&finish_resume, HZ);
 276                 dev_dbg(&dev->dev, "wait returned %d\n", rc);
 277                 writel(TIFM_IRQ_FIFOMASK(good_sockets)
 278                        | TIFM_IRQ_CARDMASK(good_sockets),
 279                        fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 280                 writel(TIFM_IRQ_FIFOMASK(good_sockets)
 281                        | TIFM_IRQ_CARDMASK(good_sockets),
 282                        fm->addr + FM_SET_INTERRUPT_ENABLE);
 283                 spin_lock_irqsave(&fm->lock, flags);
 284                 fm->finish_me = NULL;
 285                 fm->socket_change_set ^= good_sockets & fm->socket_change_set;
 286         }
 287
 288         fm->socket_change_set |= bad_sockets;
 289         if (fm->socket_change_set)
 290                 tifm_queue_work(&fm->media_switcher);
 291
 292         spin_unlock_irqrestore(&fm->lock, flags);
 293         writel(TIFM_IRQ_ENABLE,
 294                fm->addr + FM_SET_INTERRUPT_ENABLE);
 295
 296         return 0;
 297 }
 298
 299 #else
 300
 301 #define tifm_7xx1_suspend NULL
 302 #define tifm_7xx1_resume NULL
 303
 304 #endif /* CONFIG_PM */
 305
 306 static int tifm_7xx1_dummy_has_ms_pif(struct tifm_adapter *fm,
 307                                       struct tifm_dev *sock)
 308 {
 309         return 0;
 310 }
 311
 312 static int tifm_7xx1_has_ms_pif(struct tifm_adapter *fm, struct tifm_dev *sock)
 313 {
 314         if (((fm->num_sockets == 4) && (sock->socket_id == 2))
 315             || ((fm->num_sockets == 2) && (sock->socket_id == 0)))
 316                 return 1;
 317
 318         return 0;
 319 }
 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_BIT_MASK(32));
 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(dev->device == PCI_DEVICE_ID_TI_XX21_XX11_FM
 347                                 ? 4 : 2, &dev->dev);
 348         if (!fm) {
 349                 rc = -ENOMEM;
 350                 goto err_out_int;
 351         }
 352
 353         INIT_WORK(&fm->media_switcher, tifm_7xx1_switch_media);
 354         fm->eject = tifm_7xx1_eject;
 355         fm->has_ms_pif = tifm_7xx1_has_ms_pif;
 356         pci_set_drvdata(dev, fm);
 357
 358         fm->addr = pci_ioremap_bar(dev, 0);
 359         if (!fm->addr)
 360                 goto err_out_free;
 361
 362         rc = request_irq(dev->irq, tifm_7xx1_isr, IRQF_SHARED, DRIVER_NAME, fm);
 363         if (rc)
 364                 goto err_out_unmap;
 365
 366         rc = tifm_add_adapter(fm);
 367         if (rc)
 368                 goto err_out_irq;
 369
 370         writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
 371                fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 372         writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
 373                fm->addr + FM_SET_INTERRUPT_ENABLE);
 374         return 0;
 375
 376 err_out_irq:
 377         free_irq(dev->irq, fm);
 378 err_out_unmap:
 379         iounmap(fm->addr);
 380 err_out_free:
 381         pci_set_drvdata(dev, NULL);
 382         tifm_free_adapter(fm);
 383 err_out_int:
 384         pci_intx(dev, 0);
 385         pci_release_regions(dev);
 386 err_out:
 387         if (!pci_dev_busy)
 388                 pci_disable_device(dev);
 389         return rc;
 390 }
 391
 392 static void tifm_7xx1_remove(struct pci_dev *dev)
 393 {
 394         struct tifm_adapter *fm = pci_get_drvdata(dev);
 395         int cnt;
 396
 397         fm->eject = tifm_7xx1_dummy_eject;
 398         fm->has_ms_pif = tifm_7xx1_dummy_has_ms_pif;
 399         writel(TIFM_IRQ_SETALL, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 400         mmiowb();
 401         free_irq(dev->irq, fm);
 402
 403         tifm_remove_adapter(fm);
 404
 405         for (cnt = 0; cnt < fm->num_sockets; cnt++)
 406                 tifm_7xx1_sock_power_off(tifm_7xx1_sock_addr(fm->addr, cnt));
 407
 408         pci_set_drvdata(dev, NULL);
 409
 410         iounmap(fm->addr);
 411         pci_intx(dev, 0);
 412         pci_release_regions(dev);
 413
 414         pci_disable_device(dev);
 415         tifm_free_adapter(fm);
 416 }
 417
 418 static struct pci_device_id tifm_7xx1_pci_tbl [] = {
 419         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX21_XX11_FM, PCI_ANY_ID,
 420           PCI_ANY_ID, 0, 0, 0 }, /* xx21 - the one I have */
 421         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX12_FM, PCI_ANY_ID,
 422           PCI_ANY_ID, 0, 0, 0 },
 423         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX20_FM, PCI_ANY_ID,
 424           PCI_ANY_ID, 0, 0, 0 },
 425         { }
 426 };
 427
 428 static struct pci_driver tifm_7xx1_driver = {
 429         .name = DRIVER_NAME,
 430         .id_table = tifm_7xx1_pci_tbl,
 431         .probe = tifm_7xx1_probe,
 432         .remove = tifm_7xx1_remove,
 433         .suspend = tifm_7xx1_suspend,
 434         .resume = tifm_7xx1_resume,
 435 };
 436
 437 module_pci_driver(tifm_7xx1_driver);
 438 MODULE_AUTHOR("Alex Dubov");
 439 MODULE_DESCRIPTION("TI FlashMedia host driver");
 440 MODULE_LICENSE("GPL");
 441 MODULE_DEVICE_TABLE(pci, tifm_7xx1_pci_tbl);
 442 MODULE_VERSION(DRIVER_VERSION);