linux/drivers/misc/tifm_7xx1.c
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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
  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
  24static void tifm_7xx1_dummy_eject(struct tifm_adapter *fm,
  25                                  struct tifm_dev *sock)
  26{
  27}
  28
  29static 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
  39static 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
  81static 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
 126inline 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
 132inline static char __iomem *
 133tifm_7xx1_sock_addr(char __iomem *base_addr, unsigned int sock_num)
 134{
 135        return base_addr + ((sock_num + 1) << 10);
 136}
 137
 138static 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
 215static 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
 234static 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
 305static int tifm_7xx1_dummy_has_ms_pif(struct tifm_adapter *fm,
 306                                      struct tifm_dev *sock)
 307{
 308        return 0;
 309}
 310
 311static int tifm_7xx1_has_ms_pif(struct tifm_adapter *fm, struct tifm_dev *sock)
 312{
 313        if (((fm->num_sockets == 4) && (sock->socket_id == 2))
 314            || ((fm->num_sockets == 2) && (sock->socket_id == 0)))
 315                return 1;
 316
 317        return 0;
 318}
 319
 320static int tifm_7xx1_probe(struct pci_dev *dev,
 321                           const struct pci_device_id *dev_id)
 322{
 323        struct tifm_adapter *fm;
 324        int pci_dev_busy = 0;
 325        int rc;
 326
 327        rc = pci_set_dma_mask(dev, DMA_32BIT_MASK);
 328        if (rc)
 329                return rc;
 330
 331        rc = pci_enable_device(dev);
 332        if (rc)
 333                return rc;
 334
 335        pci_set_master(dev);
 336
 337        rc = pci_request_regions(dev, DRIVER_NAME);
 338        if (rc) {
 339                pci_dev_busy = 1;
 340                goto err_out;
 341        }
 342
 343        pci_intx(dev, 1);
 344
 345        fm = tifm_alloc_adapter(dev->device == PCI_DEVICE_ID_TI_XX21_XX11_FM
 346                                ? 4 : 2, &dev->dev);
 347        if (!fm) {
 348                rc = -ENOMEM;
 349                goto err_out_int;
 350        }
 351
 352        INIT_WORK(&fm->media_switcher, tifm_7xx1_switch_media);
 353        fm->eject = tifm_7xx1_eject;
 354        fm->has_ms_pif = tifm_7xx1_has_ms_pif;
 355        pci_set_drvdata(dev, fm);
 356
 357        fm->addr = ioremap(pci_resource_start(dev, 0),
 358                           pci_resource_len(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
 376err_out_irq:
 377        free_irq(dev->irq, fm);
 378err_out_unmap:
 379        iounmap(fm->addr);
 380err_out_free:
 381        pci_set_drvdata(dev, NULL);
 382        tifm_free_adapter(fm);
 383err_out_int:
 384        pci_intx(dev, 0);
 385        pci_release_regions(dev);
 386err_out:
 387        if (!pci_dev_busy)
 388                pci_disable_device(dev);
 389        return rc;
 390}
 391
 392static 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
 418static 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
 428static 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
 437static int __init tifm_7xx1_init(void)
 438{
 439        return pci_register_driver(&tifm_7xx1_driver);
 440}
 441
 442static void __exit tifm_7xx1_exit(void)
 443{
 444        pci_unregister_driver(&tifm_7xx1_driver);
 445}
 446
 447MODULE_AUTHOR("Alex Dubov");
 448MODULE_DESCRIPTION("TI FlashMedia host driver");
 449MODULE_LICENSE("GPL");
 450MODULE_DEVICE_TABLE(pci, tifm_7xx1_pci_tbl);
 451MODULE_VERSION(DRIVER_VERSION);
 452
 453module_init(tifm_7xx1_init);
 454module_exit(tifm_7xx1_exit);
 455