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
  15 #define DRIVER_NAME "tifm_7xx1"
  16 #define DRIVER_VERSION "0.8"
  17
  18 #define TIFM_IRQ_ENABLE           0x80000000
  19 #define TIFM_IRQ_SOCKMASK(x)      (x)
  20 #define TIFM_IRQ_CARDMASK(x)      ((x) << 8)
  21 #define TIFM_IRQ_FIFOMASK(x)      ((x) << 16)
  22 #define TIFM_IRQ_SETALL           0xffffffff
  23
  24 static void tifm_7xx1_dummy_eject(struct tifm_adapter *fm,
  25                                   struct tifm_dev *sock)
  26 {
  27 }
  28
  29 static void tifm_7xx1_eject(struct tifm_adapter *fm, struct tifm_dev *sock)
  30 {
  31         unsigned long flags;
  32
  33         spin_lock_irqsave(&fm->lock, flags);
  34         fm->socket_change_set |= 1 << sock->socket_id;
  35         tifm_queue_work(&fm->media_switcher);
  36         spin_unlock_irqrestore(&fm->lock, flags);
  37 }
  38
  39 static irqreturn_t tifm_7xx1_isr(int irq, void *dev_id)
  40 {
  41         struct tifm_adapter *fm = dev_id;
  42         struct tifm_dev *sock;
  43         unsigned int irq_status, cnt;
  44
  45         spin_lock(&fm->lock);
  46         irq_status = readl(fm->addr + FM_INTERRUPT_STATUS);
  47         if (irq_status == 0 || irq_status == (~0)) {
  48                 spin_unlock(&fm->lock);
  49                 return IRQ_NONE;
  50         }
  51
  52         if (irq_status & TIFM_IRQ_ENABLE) {
  53                 writel(TIFM_IRQ_ENABLE, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
  54
  55                 for (cnt = 0; cnt < fm->num_sockets; cnt++) {
  56                         sock = fm->sockets[cnt];
  57                         if (sock) {
  58                                 if ((irq_status >> cnt) & TIFM_IRQ_FIFOMASK(1))
  59                                         sock->data_event(sock);
  60                                 if ((irq_status >> cnt) & TIFM_IRQ_CARDMASK(1))
  61                                         sock->card_event(sock);
  62                         }
  63                 }
  64
  65                 fm->socket_change_set |= irq_status
  66                                          & ((1 << fm->num_sockets) - 1);
  67         }
  68         writel(irq_status, fm->addr + FM_INTERRUPT_STATUS);
  69
  70         if (fm->finish_me)
  71                 complete_all(fm->finish_me);
  72         else if (!fm->socket_change_set)
  73                 writel(TIFM_IRQ_ENABLE, fm->addr + FM_SET_INTERRUPT_ENABLE);
  74         else
  75                 tifm_queue_work(&fm->media_switcher);
  76
  77         spin_unlock(&fm->lock);
  78         return IRQ_HANDLED;
  79 }
  80
  81 static unsigned char tifm_7xx1_toggle_sock_power(char __iomem *sock_addr)
  82 {
  83         unsigned int s_state;
  84         int cnt;
  85
  86         writel(0x0e00, sock_addr + SOCK_CONTROL);
  87
  88         for (cnt = 16; cnt <= 256; cnt <<= 1) {
  89                 if (!(TIFM_SOCK_STATE_POWERED
  90                       & readl(sock_addr + SOCK_PRESENT_STATE)))
  91                         break;
  92
  93                 msleep(cnt);
  94         }
  95
  96         s_state = readl(sock_addr + SOCK_PRESENT_STATE);
  97         if (!(TIFM_SOCK_STATE_OCCUPIED & s_state))
  98                 return 0;
  99
 100         writel(readl(sock_addr + SOCK_CONTROL) | TIFM_CTRL_LED,
 101                sock_addr + SOCK_CONTROL);
 102
 103         /* xd needs some extra time before power on */
 104         if (((readl(sock_addr + SOCK_PRESENT_STATE) >> 4) & 7)
 105             == TIFM_TYPE_XD)
 106                 msleep(40);
 107
 108         writel((s_state & TIFM_CTRL_POWER_MASK) | 0x0c00,
 109                sock_addr + SOCK_CONTROL);
 110         /* wait for power to stabilize */
 111         msleep(20);
 112         for (cnt = 16; cnt <= 256; cnt <<= 1) {
 113                 if ((TIFM_SOCK_STATE_POWERED
 114                      & readl(sock_addr + SOCK_PRESENT_STATE)))
 115                         break;
 116
 117                 msleep(cnt);
 118         }
 119
 120         writel(readl(sock_addr + SOCK_CONTROL) & (~TIFM_CTRL_LED),
 121                sock_addr + SOCK_CONTROL);
 122
 123         return (readl(sock_addr + SOCK_PRESENT_STATE) >> 4) & 7;
 124 }
 125
 126 inline static void tifm_7xx1_sock_power_off(char __iomem *sock_addr)
 127 {
 128         writel((~TIFM_CTRL_POWER_MASK) & readl(sock_addr + SOCK_CONTROL),
 129                sock_addr + SOCK_CONTROL);
 130 }
 131
 132 inline static char __iomem *
 133 tifm_7xx1_sock_addr(char __iomem *base_addr, unsigned int sock_num)
 134 {
 135         return base_addr + ((sock_num + 1) << 10);
 136 }
 137
 138 static void tifm_7xx1_switch_media(struct work_struct *work)
 139 {
 140         struct tifm_adapter *fm = container_of(work, struct tifm_adapter,
 141                                                media_switcher);
 142         struct tifm_dev *sock;
 143         char __iomem *sock_addr;
 144         unsigned long flags;
 145         unsigned char media_id;
 146         unsigned int socket_change_set, cnt;
 147
 148         spin_lock_irqsave(&fm->lock, flags);
 149         socket_change_set = fm->socket_change_set;
 150         fm->socket_change_set = 0;
 151
 152         dev_dbg(fm->dev.parent, "checking media set %x\n",
 153                 socket_change_set);
 154
 155         if (!socket_change_set) {
 156                 spin_unlock_irqrestore(&fm->lock, flags);
 157                 return;
 158         }
 159
 160         for (cnt = 0; cnt < fm->num_sockets; cnt++) {
 161                 if (!(socket_change_set & (1 << cnt)))
 162                         continue;
 163                 sock = fm->sockets[cnt];
 164                 if (sock) {
 165                         printk(KERN_INFO
 166                                "%s : demand removing card from socket %u:%u\n",
 167                                fm->dev.bus_id, fm->id, cnt);
 168                         fm->sockets[cnt] = NULL;
 169                         sock_addr = sock->addr;
 170                         spin_unlock_irqrestore(&fm->lock, flags);
 171                         device_unregister(&sock->dev);
 172                         spin_lock_irqsave(&fm->lock, flags);
 173                         tifm_7xx1_sock_power_off(sock_addr);
 174                         writel(0x0e00, sock_addr + SOCK_CONTROL);
 175                 }
 176
 177                 spin_unlock_irqrestore(&fm->lock, flags);
 178
 179                 media_id = tifm_7xx1_toggle_sock_power(
 180                                 tifm_7xx1_sock_addr(fm->addr, cnt));
 181
 182                 // tifm_alloc_device will check if media_id is valid
 183                 sock = tifm_alloc_device(fm, cnt, media_id);
 184                 if (sock) {
 185                         sock->addr = tifm_7xx1_sock_addr(fm->addr, cnt);
 186
 187                         if (!device_register(&sock->dev)) {
 188                                 spin_lock_irqsave(&fm->lock, flags);
 189                                 if (!fm->sockets[cnt]) {
 190                                         fm->sockets[cnt] = sock;
 191                                         sock = NULL;
 192                                 }
 193                                 spin_unlock_irqrestore(&fm->lock, flags);
 194                         }
 195                         if (sock)
 196                                 tifm_free_device(&sock->dev);
 197                 }
 198                 spin_lock_irqsave(&fm->lock, flags);
 199         }
 200
 201         writel(TIFM_IRQ_FIFOMASK(socket_change_set)
 202                | TIFM_IRQ_CARDMASK(socket_change_set),
 203                fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 204
 205         writel(TIFM_IRQ_FIFOMASK(socket_change_set)
 206                | TIFM_IRQ_CARDMASK(socket_change_set),
 207                fm->addr + FM_SET_INTERRUPT_ENABLE);
 208
 209         writel(TIFM_IRQ_ENABLE, fm->addr + FM_SET_INTERRUPT_ENABLE);
 210         spin_unlock_irqrestore(&fm->lock, flags);
 211 }
 212
 213 #ifdef CONFIG_PM
 214
 215 static int tifm_7xx1_suspend(struct pci_dev *dev, pm_message_t state)
 216 {
 217         struct tifm_adapter *fm = pci_get_drvdata(dev);
 218         int cnt;
 219
 220         dev_dbg(&dev->dev, "suspending host\n");
 221
 222         for (cnt = 0; cnt < fm->num_sockets; cnt++) {
 223                 if (fm->sockets[cnt])
 224                         tifm_7xx1_sock_power_off(fm->sockets[cnt]->addr);
 225         }
 226
 227         pci_save_state(dev);
 228         pci_enable_wake(dev, pci_choose_state(dev, state), 0);
 229         pci_disable_device(dev);
 230         pci_set_power_state(dev, pci_choose_state(dev, state));
 231         return 0;
 232 }
 233
 234 static int tifm_7xx1_resume(struct pci_dev *dev)
 235 {
 236         struct tifm_adapter *fm = pci_get_drvdata(dev);
 237         int rc;
 238         unsigned int good_sockets = 0, bad_sockets = 0;
 239         unsigned long flags;
 240         unsigned char new_ids[fm->num_sockets];
 241         DECLARE_COMPLETION_ONSTACK(finish_resume);
 242
 243         pci_set_power_state(dev, PCI_D0);
 244         pci_restore_state(dev);
 245         rc = pci_enable_device(dev);
 246         if (rc)
 247                 return rc;
 248         pci_set_master(dev);
 249
 250         dev_dbg(&dev->dev, "resuming host\n");
 251
 252         for (rc = 0; rc < fm->num_sockets; rc++)
 253                 new_ids[rc] = tifm_7xx1_toggle_sock_power(
 254                                         tifm_7xx1_sock_addr(fm->addr, rc));
 255         spin_lock_irqsave(&fm->lock, flags);
 256         for (rc = 0; rc < fm->num_sockets; rc++) {
 257                 if (fm->sockets[rc]) {
 258                         if (fm->sockets[rc]->type == new_ids[rc])
 259                                 good_sockets |= 1 << rc;
 260                         else
 261                                 bad_sockets |= 1 << rc;
 262                 }
 263         }
 264
 265         writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
 266                fm->addr + FM_SET_INTERRUPT_ENABLE);
 267         dev_dbg(&dev->dev, "change sets on resume: good %x, bad %x\n",
 268                 good_sockets, bad_sockets);
 269
 270         fm->socket_change_set = 0;
 271         if (good_sockets) {
 272                 fm->finish_me = &finish_resume;
 273                 spin_unlock_irqrestore(&fm->lock, flags);
 274                 rc = wait_for_completion_timeout(&finish_resume, HZ);
 275                 dev_dbg(&dev->dev, "wait returned %d\n", rc);
 276                 writel(TIFM_IRQ_FIFOMASK(good_sockets)
 277                        | TIFM_IRQ_CARDMASK(good_sockets),
 278                        fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 279                 writel(TIFM_IRQ_FIFOMASK(good_sockets)
 280                        | TIFM_IRQ_CARDMASK(good_sockets),
 281                        fm->addr + FM_SET_INTERRUPT_ENABLE);
 282                 spin_lock_irqsave(&fm->lock, flags);
 283                 fm->finish_me = NULL;
 284                 fm->socket_change_set ^= good_sockets & fm->socket_change_set;
 285         }
 286
 287         fm->socket_change_set |= bad_sockets;
 288         if (fm->socket_change_set)
 289                 tifm_queue_work(&fm->media_switcher);
 290
 291         spin_unlock_irqrestore(&fm->lock, flags);
 292         writel(TIFM_IRQ_ENABLE,
 293                fm->addr + FM_SET_INTERRUPT_ENABLE);
 294
 295         return 0;
 296 }
 297
 298 #else
 299
 300 #define tifm_7xx1_suspend NULL
 301 #define tifm_7xx1_resume NULL
 302
 303 #endif /* CONFIG_PM */
 304
 305 static int tifm_7xx1_probe(struct pci_dev *dev,
 306                            const struct pci_device_id *dev_id)
 307 {
 308         struct tifm_adapter *fm;
 309         int pci_dev_busy = 0;
 310         int rc;
 311
 312         rc = pci_set_dma_mask(dev, DMA_32BIT_MASK);
 313         if (rc)
 314                 return rc;
 315
 316         rc = pci_enable_device(dev);
 317         if (rc)
 318                 return rc;
 319
 320         pci_set_master(dev);
 321
 322         rc = pci_request_regions(dev, DRIVER_NAME);
 323         if (rc) {
 324                 pci_dev_busy = 1;
 325                 goto err_out;
 326         }
 327
 328         pci_intx(dev, 1);
 329
 330         fm = tifm_alloc_adapter(dev->device == PCI_DEVICE_ID_TI_XX21_XX11_FM
 331                                 ? 4 : 2, &dev->dev);
 332         if (!fm) {
 333                 rc = -ENOMEM;
 334                 goto err_out_int;
 335         }
 336
 337         INIT_WORK(&fm->media_switcher, tifm_7xx1_switch_media);
 338         fm->eject = tifm_7xx1_eject;
 339         pci_set_drvdata(dev, fm);
 340
 341         fm->addr = ioremap(pci_resource_start(dev, 0),
 342                            pci_resource_len(dev, 0));
 343         if (!fm->addr)
 344                 goto err_out_free;
 345
 346         rc = request_irq(dev->irq, tifm_7xx1_isr, IRQF_SHARED, DRIVER_NAME, fm);
 347         if (rc)
 348                 goto err_out_unmap;
 349
 350         rc = tifm_add_adapter(fm);
 351         if (rc)
 352                 goto err_out_irq;
 353
 354         writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
 355                fm->addr + FM_SET_INTERRUPT_ENABLE);
 356         return 0;
 357
 358 err_out_irq:
 359         free_irq(dev->irq, fm);
 360 err_out_unmap:
 361         iounmap(fm->addr);
 362 err_out_free:
 363         pci_set_drvdata(dev, NULL);
 364         tifm_free_adapter(fm);
 365 err_out_int:
 366         pci_intx(dev, 0);
 367         pci_release_regions(dev);
 368 err_out:
 369         if (!pci_dev_busy)
 370                 pci_disable_device(dev);
 371         return rc;
 372 }
 373
 374 static void tifm_7xx1_remove(struct pci_dev *dev)
 375 {
 376         struct tifm_adapter *fm = pci_get_drvdata(dev);
 377         int cnt;
 378
 379         fm->eject = tifm_7xx1_dummy_eject;
 380         writel(TIFM_IRQ_SETALL, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 381         mmiowb();
 382         free_irq(dev->irq, fm);
 383
 384         tifm_remove_adapter(fm);
 385
 386         for (cnt = 0; cnt < fm->num_sockets; cnt++)
 387                 tifm_7xx1_sock_power_off(tifm_7xx1_sock_addr(fm->addr, cnt));
 388
 389         pci_set_drvdata(dev, NULL);
 390
 391         iounmap(fm->addr);
 392         pci_intx(dev, 0);
 393         pci_release_regions(dev);
 394
 395         pci_disable_device(dev);
 396         tifm_free_adapter(fm);
 397 }
 398
 399 static struct pci_device_id tifm_7xx1_pci_tbl [] = {
 400         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX21_XX11_FM, PCI_ANY_ID,
 401           PCI_ANY_ID, 0, 0, 0 }, /* xx21 - the one I have */
 402         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX12_FM, PCI_ANY_ID,
 403           PCI_ANY_ID, 0, 0, 0 },
 404         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX20_FM, PCI_ANY_ID,
 405           PCI_ANY_ID, 0, 0, 0 },
 406         { }
 407 };
 408
 409 static struct pci_driver tifm_7xx1_driver = {
 410         .name = DRIVER_NAME,
 411         .id_table = tifm_7xx1_pci_tbl,
 412         .probe = tifm_7xx1_probe,
 413         .remove = tifm_7xx1_remove,
 414         .suspend = tifm_7xx1_suspend,
 415         .resume = tifm_7xx1_resume,
 416 };
 417
 418 static int __init tifm_7xx1_init(void)
 419 {
 420         return pci_register_driver(&tifm_7xx1_driver);
 421 }
 422
 423 static void __exit tifm_7xx1_exit(void)
 424 {
 425         pci_unregister_driver(&tifm_7xx1_driver);
 426 }
 427
 428 MODULE_AUTHOR("Alex Dubov");
 429 MODULE_DESCRIPTION("TI FlashMedia host driver");
 430 MODULE_LICENSE("GPL");
 431 MODULE_DEVICE_TABLE(pci, tifm_7xx1_pci_tbl);
 432 MODULE_VERSION(DRIVER_VERSION);
 433
 434 module_init(tifm_7xx1_init);
 435 module_exit(tifm_7xx1_exit);