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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 cnt, rc;
 224         unsigned long flags;
 225         unsigned char new_ids[fm->num_sockets];
 226         DECLARE_COMPLETION_ONSTACK(finish_resume);
 227
 228         pci_set_power_state(dev, PCI_D0);
 229         pci_restore_state(dev);
 230         rc = pci_enable_device(dev);
 231         if (rc)
 232                 return rc;
 233         pci_set_master(dev);
 234
 235         dev_dbg(&dev->dev, "resuming host\n");
 236
 237         for (cnt = 0; cnt < fm->num_sockets; cnt++)
 238                 new_ids[cnt] = tifm_7xx1_toggle_sock_power(
 239                                         tifm_7xx1_sock_addr(fm->addr, cnt));
 240         spin_lock_irqsave(&fm->lock, flags);
 241         fm->socket_change_set = 0;
 242         for (cnt = 0; cnt < fm->num_sockets; cnt++) {
 243                 if (fm->sockets[cnt]) {
 244                         if (fm->sockets[cnt]->type == new_ids[cnt])
 245                                 fm->socket_change_set |= 1 << cnt;
 246
 247                         fm->sockets[cnt]->type = new_ids[cnt];
 248                 }
 249         }
 250
 251         writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
 252                fm->addr + FM_SET_INTERRUPT_ENABLE);
 253         if (!fm->socket_change_set) {
 254                 spin_unlock_irqrestore(&fm->lock, flags);
 255                 return 0;
 256         } else {
 257                 fm->socket_change_set = 0;
 258                 fm->finish_me = &finish_resume;
 259                 spin_unlock_irqrestore(&fm->lock, flags);
 260         }
 261
 262         wait_for_completion_timeout(&finish_resume, HZ);
 263
 264         spin_lock_irqsave(&fm->lock, flags);
 265         fm->finish_me = NULL;
 266         writel(TIFM_IRQ_FIFOMASK(fm->socket_change_set)
 267                | TIFM_IRQ_CARDMASK(fm->socket_change_set),
 268                fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 269         writel(TIFM_IRQ_FIFOMASK(fm->socket_change_set)
 270                | TIFM_IRQ_CARDMASK(fm->socket_change_set),
 271                fm->addr + FM_SET_INTERRUPT_ENABLE);
 272         writel(TIFM_IRQ_ENABLE,
 273                fm->addr + FM_SET_INTERRUPT_ENABLE);
 274         fm->socket_change_set = 0;
 275
 276         spin_unlock_irqrestore(&fm->lock, flags);
 277         return 0;
 278 }
 279
 280 #else
 281
 282 #define tifm_7xx1_suspend NULL
 283 #define tifm_7xx1_resume NULL
 284
 285 #endif /* CONFIG_PM */
 286
 287 static int tifm_7xx1_probe(struct pci_dev *dev,
 288                            const struct pci_device_id *dev_id)
 289 {
 290         struct tifm_adapter *fm;
 291         int pci_dev_busy = 0;
 292         int rc;
 293
 294         rc = pci_set_dma_mask(dev, DMA_32BIT_MASK);
 295         if (rc)
 296                 return rc;
 297
 298         rc = pci_enable_device(dev);
 299         if (rc)
 300                 return rc;
 301
 302         pci_set_master(dev);
 303
 304         rc = pci_request_regions(dev, DRIVER_NAME);
 305         if (rc) {
 306                 pci_dev_busy = 1;
 307                 goto err_out;
 308         }
 309
 310         pci_intx(dev, 1);
 311
 312         fm = tifm_alloc_adapter(dev->device == PCI_DEVICE_ID_TI_XX21_XX11_FM
 313                                 ? 4 : 2, &dev->dev);
 314         if (!fm) {
 315                 rc = -ENOMEM;
 316                 goto err_out_int;
 317         }
 318
 319         INIT_WORK(&fm->media_switcher, tifm_7xx1_switch_media);
 320         fm->eject = tifm_7xx1_eject;
 321         pci_set_drvdata(dev, fm);
 322
 323         fm->addr = ioremap(pci_resource_start(dev, 0),
 324                            pci_resource_len(dev, 0));
 325         if (!fm->addr)
 326                 goto err_out_free;
 327
 328         rc = request_irq(dev->irq, tifm_7xx1_isr, SA_SHIRQ, DRIVER_NAME, fm);
 329         if (rc)
 330                 goto err_out_unmap;
 331
 332         rc = tifm_add_adapter(fm);
 333         if (rc)
 334                 goto err_out_irq;
 335
 336         writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
 337                fm->addr + FM_SET_INTERRUPT_ENABLE);
 338         return 0;
 339
 340 err_out_irq:
 341         free_irq(dev->irq, fm);
 342 err_out_unmap:
 343         iounmap(fm->addr);
 344 err_out_free:
 345         pci_set_drvdata(dev, NULL);
 346         tifm_free_adapter(fm);
 347 err_out_int:
 348         pci_intx(dev, 0);
 349         pci_release_regions(dev);
 350 err_out:
 351         if (!pci_dev_busy)
 352                 pci_disable_device(dev);
 353         return rc;
 354 }
 355
 356 static void tifm_7xx1_remove(struct pci_dev *dev)
 357 {
 358         struct tifm_adapter *fm = pci_get_drvdata(dev);
 359
 360         fm->eject = tifm_7xx1_dummy_eject;
 361         writel(TIFM_IRQ_SETALL, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 362         mmiowb();
 363         free_irq(dev->irq, fm);
 364
 365         tifm_remove_adapter(fm);
 366
 367         pci_set_drvdata(dev, NULL);
 368
 369         iounmap(fm->addr);
 370         pci_intx(dev, 0);
 371         pci_release_regions(dev);
 372
 373         pci_disable_device(dev);
 374         tifm_free_adapter(fm);
 375 }
 376
 377 static struct pci_device_id tifm_7xx1_pci_tbl [] = {
 378         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX21_XX11_FM, PCI_ANY_ID,
 379           PCI_ANY_ID, 0, 0, 0 }, /* xx21 - the one I have */
 380         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX12_FM, PCI_ANY_ID,
 381           PCI_ANY_ID, 0, 0, 0 },
 382         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX20_FM, PCI_ANY_ID,
 383           PCI_ANY_ID, 0, 0, 0 },
 384         { }
 385 };
 386
 387 static struct pci_driver tifm_7xx1_driver = {
 388         .name = DRIVER_NAME,
 389         .id_table = tifm_7xx1_pci_tbl,
 390         .probe = tifm_7xx1_probe,
 391         .remove = tifm_7xx1_remove,
 392         .suspend = tifm_7xx1_suspend,
 393         .resume = tifm_7xx1_resume,
 394 };
 395
 396 static int __init tifm_7xx1_init(void)
 397 {
 398         return pci_register_driver(&tifm_7xx1_driver);
 399 }
 400
 401 static void __exit tifm_7xx1_exit(void)
 402 {
 403         pci_unregister_driver(&tifm_7xx1_driver);
 404 }
 405
 406 MODULE_AUTHOR("Alex Dubov");
 407 MODULE_DESCRIPTION("TI FlashMedia host driver");
 408 MODULE_LICENSE("GPL");
 409 MODULE_DEVICE_TABLE(pci, tifm_7xx1_pci_tbl);
 410 MODULE_VERSION(DRIVER_VERSION);
 411
 412 module_init(tifm_7xx1_init);
 413 module_exit(tifm_7xx1_exit);