Pileus Git - ~andy/linux/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 #include <linux/dma-mapping.h>
  14 #include <linux/freezer.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_eject(struct tifm_adapter *fm, struct tifm_dev *sock)
  26 {
  27         unsigned long flags;
  28
  29         spin_lock_irqsave(&fm->lock, flags);
  30         fm->socket_change_set |= 1 << sock->socket_id;
  31         tifm_queue_work(&fm->media_switcher);
  32         spin_unlock_irqrestore(&fm->lock, flags);
  33 }
  34
  35 static irqreturn_t tifm_7xx1_isr(int irq, void *dev_id)
  36 {
  37         struct tifm_adapter *fm = dev_id;
  38         struct tifm_dev *sock;
  39         unsigned int irq_status;
  40         unsigned int cnt;
  41
  42         spin_lock(&fm->lock);
  43         irq_status = readl(fm->addr + FM_INTERRUPT_STATUS);
  44         if (irq_status == 0 || irq_status == (~0)) {
  45                 spin_unlock(&fm->lock);
  46                 return IRQ_NONE;
  47         }
  48
  49         if (irq_status & TIFM_IRQ_ENABLE) {
  50                 writel(TIFM_IRQ_ENABLE, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
  51
  52                 for (cnt = 0; cnt < fm->num_sockets; cnt++) {
  53                         sock = fm->sockets[cnt];
  54                         if (sock) {
  55                                 if ((irq_status >> cnt) & TIFM_IRQ_FIFOMASK(1))
  56                                         sock->data_event(sock);
  57                                 if ((irq_status >> cnt) & TIFM_IRQ_CARDMASK(1))
  58                                         sock->card_event(sock);
  59                         }
  60                 }
  61
  62                 fm->socket_change_set |= irq_status
  63                                          & ((1 << fm->num_sockets) - 1);
  64         }
  65         writel(irq_status, fm->addr + FM_INTERRUPT_STATUS);
  66
  67         if (fm->finish_me)
  68                 complete_all(fm->finish_me);
  69         else if (!fm->socket_change_set)
  70                 writel(TIFM_IRQ_ENABLE, fm->addr + FM_SET_INTERRUPT_ENABLE);
  71         else
  72                 tifm_queue_work(&fm->media_switcher);
  73
  74         spin_unlock(&fm->lock);
  75         return IRQ_HANDLED;
  76 }
  77
  78 static unsigned char tifm_7xx1_toggle_sock_power(char __iomem *sock_addr)
  79 {
  80         unsigned int s_state;
  81         int cnt;
  82
  83         writel(0x0e00, sock_addr + SOCK_CONTROL);
  84
  85         for (cnt = 16; cnt <= 256; cnt <<= 1) {
  86                 if (!(TIFM_SOCK_STATE_POWERED
  87                       & readl(sock_addr + SOCK_PRESENT_STATE)))
  88                         break;
  89
  90                 msleep(cnt);
  91         }
  92
  93         s_state = readl(sock_addr + SOCK_PRESENT_STATE);
  94         if (!(TIFM_SOCK_STATE_OCCUPIED & s_state))
  95                 return 0;
  96
  97         writel(readl(sock_addr + SOCK_CONTROL) | TIFM_CTRL_LED,
  98                sock_addr + SOCK_CONTROL);
  99
 100         /* xd needs some extra time before power on */
 101         if (((readl(sock_addr + SOCK_PRESENT_STATE) >> 4) & 7)
 102             == TIFM_TYPE_XD)
 103                 msleep(40);
 104
 105         writel((s_state & 7) | 0x0c00, sock_addr + SOCK_CONTROL);
 106         /* wait for power to stabilize */
 107         msleep(20);
 108         for (cnt = 16; cnt <= 256; cnt <<= 1) {
 109                 if ((TIFM_SOCK_STATE_POWERED
 110                      & readl(sock_addr + SOCK_PRESENT_STATE)))
 111                         break;
 112
 113                 msleep(cnt);
 114         }
 115
 116         writel(readl(sock_addr + SOCK_CONTROL) & (~TIFM_CTRL_LED),
 117                sock_addr + SOCK_CONTROL);
 118
 119         return (readl(sock_addr + SOCK_PRESENT_STATE) >> 4) & 7;
 120 }
 121
 122 inline static char __iomem *
 123 tifm_7xx1_sock_addr(char __iomem *base_addr, unsigned int sock_num)
 124 {
 125         return base_addr + ((sock_num + 1) << 10);
 126 }
 127
 128 static void tifm_7xx1_switch_media(struct work_struct *work)
 129 {
 130         struct tifm_adapter *fm = container_of(work, struct tifm_adapter,
 131                                                media_switcher);
 132         unsigned long flags;
 133         unsigned char media_id;
 134         char *card_name = "xx";
 135         int cnt;
 136         struct tifm_dev *sock;
 137         unsigned int socket_change_set;
 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->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 DRIVER_NAME
 157                                        ": demand removing card from socket %d\n",
 158                                        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,
 164                                        tifm_7xx1_sock_addr(fm->addr, cnt)
 165                                        + SOCK_CONTROL);
 166                         }
 167
 168                         spin_unlock_irqrestore(&fm->lock, flags);
 169                         media_id = tifm_7xx1_toggle_sock_power(
 170                                         tifm_7xx1_sock_addr(fm->addr, cnt));
 171                         if (media_id) {
 172                                 sock = tifm_alloc_device(fm);
 173                                 if (sock) {
 174                                         sock->addr = tifm_7xx1_sock_addr(fm->addr,
 175                                                                          cnt);
 176                                         sock->type = media_id;
 177                                         sock->socket_id = cnt;
 178                                         switch (media_id) {
 179                                         case 1:
 180                                                 card_name = "xd";
 181                                                 break;
 182                                         case 2:
 183                                                 card_name = "ms";
 184                                                 break;
 185                                         case 3:
 186                                                 card_name = "sd";
 187                                                 break;
 188                                         default:
 189                                                 tifm_free_device(&sock->dev);
 190                                                 spin_lock_irqsave(&fm->lock, flags);
 191                                                 continue;
 192                                         }
 193                                         snprintf(sock->dev.bus_id, BUS_ID_SIZE,
 194                                                  "tifm_%s%u:%u", card_name,
 195                                                  fm->id, cnt);
 196                                         printk(KERN_INFO DRIVER_NAME
 197                                                ": %s card detected in socket %d\n",
 198                                                card_name, cnt);
 199                                         if (!device_register(&sock->dev)) {
 200                                                 spin_lock_irqsave(&fm->lock, flags);
 201                                                 if (!fm->sockets[cnt]) {
 202                                                         fm->sockets[cnt] = sock;
 203                                                         sock = NULL;
 204                                                 }
 205                                                 spin_unlock_irqrestore(&fm->lock, flags);
 206                                         }
 207                                         if (sock)
 208                                                 tifm_free_device(&sock->dev);
 209                                 }
 210                                 spin_lock_irqsave(&fm->lock, flags);
 211                         }
 212                 }
 213
 214         writel(TIFM_IRQ_FIFOMASK(socket_change_set)
 215                | TIFM_IRQ_CARDMASK(socket_change_set),
 216                fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 217
 218         writel(TIFM_IRQ_FIFOMASK(socket_change_set)
 219                | TIFM_IRQ_CARDMASK(socket_change_set),
 220                fm->addr + FM_SET_INTERRUPT_ENABLE);
 221
 222         writel(TIFM_IRQ_ENABLE, fm->addr + FM_SET_INTERRUPT_ENABLE);
 223         spin_unlock_irqrestore(&fm->lock, flags);
 224 }
 225
 226 #ifdef CONFIG_PM
 227
 228 static int tifm_7xx1_suspend(struct pci_dev *dev, pm_message_t state)
 229 {
 230         dev_dbg(&dev->dev, "suspending host\n");
 231
 232         pci_save_state(dev);
 233         pci_enable_wake(dev, pci_choose_state(dev, state), 0);
 234         pci_disable_device(dev);
 235         pci_set_power_state(dev, pci_choose_state(dev, state));
 236         return 0;
 237 }
 238
 239 static int tifm_7xx1_resume(struct pci_dev *dev)
 240 {
 241         struct tifm_adapter *fm = pci_get_drvdata(dev);
 242         int cnt, rc;
 243         unsigned long flags;
 244         unsigned char new_ids[fm->num_sockets];
 245         DECLARE_COMPLETION_ONSTACK(finish_resume);
 246
 247         pci_set_power_state(dev, PCI_D0);
 248         pci_restore_state(dev);
 249         rc = pci_enable_device(dev);
 250         if (rc)
 251                 return rc;
 252         pci_set_master(dev);
 253
 254         dev_dbg(&dev->dev, "resuming host\n");
 255
 256         for (cnt = 0; cnt < fm->num_sockets; cnt++)
 257                 new_ids[cnt] = tifm_7xx1_toggle_sock_power(
 258                                         tifm_7xx1_sock_addr(fm->addr, cnt));
 259         spin_lock_irqsave(&fm->lock, flags);
 260         fm->socket_change_set = 0;
 261         for (cnt = 0; cnt < fm->num_sockets; cnt++) {
 262                 if (fm->sockets[cnt]) {
 263                         if (fm->sockets[cnt]->type == new_ids[cnt])
 264                                 fm->socket_change_set |= 1 << cnt;
 265
 266                         fm->sockets[cnt]->type = new_ids[cnt];
 267                 }
 268         }
 269
 270         writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
 271                fm->addr + FM_SET_INTERRUPT_ENABLE);
 272         if (!fm->socket_change_set) {
 273                 spin_unlock_irqrestore(&fm->lock, flags);
 274                 return 0;
 275         } else {
 276                 fm->socket_change_set = 0;
 277                 fm->finish_me = &finish_resume;
 278                 spin_unlock_irqrestore(&fm->lock, flags);
 279         }
 280
 281         wait_for_completion_timeout(&finish_resume, HZ);
 282
 283         spin_lock_irqsave(&fm->lock, flags);
 284         fm->finish_me = NULL;
 285         writel(TIFM_IRQ_FIFOMASK(fm->socket_change_set)
 286                | TIFM_IRQ_CARDMASK(fm->socket_change_set),
 287                fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 288         writel(TIFM_IRQ_FIFOMASK(fm->socket_change_set)
 289                | TIFM_IRQ_CARDMASK(fm->socket_change_set),
 290                fm->addr + FM_SET_INTERRUPT_ENABLE);
 291         writel(TIFM_IRQ_ENABLE,
 292                fm->addr + FM_SET_INTERRUPT_ENABLE);
 293         fm->socket_change_set = 0;
 294
 295         spin_unlock_irqrestore(&fm->lock, flags);
 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_probe(struct pci_dev *dev,
 307                            const struct pci_device_id *dev_id)
 308 {
 309         struct tifm_adapter *fm;
 310         int pci_dev_busy = 0;
 311         int rc;
 312
 313         rc = pci_set_dma_mask(dev, DMA_32BIT_MASK);
 314         if (rc)
 315                 return rc;
 316
 317         rc = pci_enable_device(dev);
 318         if (rc)
 319                 return rc;
 320
 321         pci_set_master(dev);
 322
 323         rc = pci_request_regions(dev, DRIVER_NAME);
 324         if (rc) {
 325                 pci_dev_busy = 1;
 326                 goto err_out;
 327         }
 328
 329         pci_intx(dev, 1);
 330
 331         fm = tifm_alloc_adapter();
 332         if (!fm) {
 333                 rc = -ENOMEM;
 334                 goto err_out_int;
 335         }
 336
 337         fm->dev = &dev->dev;
 338         fm->num_sockets = (dev->device == PCI_DEVICE_ID_TI_XX21_XX11_FM)
 339                           ? 4 : 2;
 340         fm->sockets = kzalloc(sizeof(struct tifm_dev*) * fm->num_sockets,
 341                               GFP_KERNEL);
 342         if (!fm->sockets)
 343                 goto err_out_free;
 344
 345         INIT_WORK(&fm->media_switcher, tifm_7xx1_switch_media);
 346         fm->eject = tifm_7xx1_eject;
 347         pci_set_drvdata(dev, fm);
 348
 349         fm->addr = ioremap(pci_resource_start(dev, 0),
 350                            pci_resource_len(dev, 0));
 351         if (!fm->addr)
 352                 goto err_out_free;
 353
 354         rc = request_irq(dev->irq, tifm_7xx1_isr, IRQF_SHARED, DRIVER_NAME, fm);
 355         if (rc)
 356                 goto err_out_unmap;
 357
 358         rc = tifm_add_adapter(fm);
 359         if (rc)
 360                 goto err_out_irq;
 361
 362         writel(TIFM_IRQ_SETALL, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 363         writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
 364                fm->addr + FM_SET_INTERRUPT_ENABLE);
 365
 366         return 0;
 367
 368 err_out_irq:
 369         free_irq(dev->irq, fm);
 370 err_out_unmap:
 371         iounmap(fm->addr);
 372 err_out_free:
 373         pci_set_drvdata(dev, NULL);
 374         tifm_free_adapter(fm);
 375 err_out_int:
 376         pci_intx(dev, 0);
 377         pci_release_regions(dev);
 378 err_out:
 379         if (!pci_dev_busy)
 380                 pci_disable_device(dev);
 381         return rc;
 382 }
 383
 384 static void tifm_7xx1_remove(struct pci_dev *dev)
 385 {
 386         struct tifm_adapter *fm = pci_get_drvdata(dev);
 387         unsigned long flags;
 388
 389         writel(TIFM_IRQ_SETALL, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 390         mmiowb();
 391         free_irq(dev->irq, fm);
 392
 393         spin_lock_irqsave(&fm->lock, flags);
 394         fm->socket_change_set = (1 << fm->num_sockets) - 1;
 395         spin_unlock_irqrestore(&fm->lock, flags);
 396
 397         tifm_remove_adapter(fm);
 398
 399         pci_set_drvdata(dev, NULL);
 400
 401         iounmap(fm->addr);
 402         pci_intx(dev, 0);
 403         pci_release_regions(dev);
 404
 405         pci_disable_device(dev);
 406         tifm_free_adapter(fm);
 407 }
 408
 409 static struct pci_device_id tifm_7xx1_pci_tbl [] = {
 410         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX21_XX11_FM, PCI_ANY_ID,
 411           PCI_ANY_ID, 0, 0, 0 }, /* xx21 - the one I have */
 412         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX12_FM, PCI_ANY_ID,
 413           PCI_ANY_ID, 0, 0, 0 },
 414         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX20_FM, PCI_ANY_ID,
 415           PCI_ANY_ID, 0, 0, 0 },
 416         { }
 417 };
 418
 419 static struct pci_driver tifm_7xx1_driver = {
 420         .name = DRIVER_NAME,
 421         .id_table = tifm_7xx1_pci_tbl,
 422         .probe = tifm_7xx1_probe,
 423         .remove = tifm_7xx1_remove,
 424         .suspend = tifm_7xx1_suspend,
 425         .resume = tifm_7xx1_resume,
 426 };
 427
 428 static int __init tifm_7xx1_init(void)
 429 {
 430         return pci_register_driver(&tifm_7xx1_driver);
 431 }
 432
 433 static void __exit tifm_7xx1_exit(void)
 434 {
 435         pci_unregister_driver(&tifm_7xx1_driver);
 436 }
 437
 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);
 443
 444 module_init(tifm_7xx1_init);
 445 module_exit(tifm_7xx1_exit);