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