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#include <linux/module.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
  25static void tifm_7xx1_dummy_eject(struct tifm_adapter *fm,
  26                                  struct tifm_dev *sock)
  27{
  28}
  29
  30static 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
  40static 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, cnt;
  45
  46        spin_lock(&fm->lock);
  47        irq_status = readl(fm->addr + FM_INTERRUPT_STATUS);
  48        if (irq_status == 0 || irq_status == (~0)) {
  49                spin_unlock(&fm->lock);
  50                return IRQ_NONE;
  51        }
  52
  53        if (irq_status & TIFM_IRQ_ENABLE) {
  54                writel(TIFM_IRQ_ENABLE, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
  55
  56                for (cnt = 0; cnt < fm->num_sockets; cnt++) {
  57                        sock = fm->sockets[cnt];
  58                        if (sock) {
  59                                if ((irq_status >> cnt) & TIFM_IRQ_FIFOMASK(1))
  60                                        sock->data_event(sock);
  61                                if ((irq_status >> cnt) & TIFM_IRQ_CARDMASK(1))
  62                                        sock->card_event(sock);
  63                        }
  64                }
  65
  66                fm->socket_change_set |= irq_status
  67                                         & ((1 << fm->num_sockets) - 1);
  68        }
  69        writel(irq_status, fm->addr + FM_INTERRUPT_STATUS);
  70
  71        if (fm->finish_me)
  72                complete_all(fm->finish_me);
  73        else if (!fm->socket_change_set)
  74                writel(TIFM_IRQ_ENABLE, fm->addr + FM_SET_INTERRUPT_ENABLE);
  75        else
  76                tifm_queue_work(&fm->media_switcher);
  77
  78        spin_unlock(&fm->lock);
  79        return IRQ_HANDLED;
  80}
  81
  82static unsigned char tifm_7xx1_toggle_sock_power(char __iomem *sock_addr)
  83{
  84        unsigned int s_state;
  85        int cnt;
  86
  87        writel(0x0e00, sock_addr + SOCK_CONTROL);
  88
  89        for (cnt = 16; cnt <= 256; cnt <<= 1) {
  90                if (!(TIFM_SOCK_STATE_POWERED
  91                      & readl(sock_addr + SOCK_PRESENT_STATE)))
  92                        break;
  93
  94                msleep(cnt);
  95        }
  96
  97        s_state = readl(sock_addr + SOCK_PRESENT_STATE);
  98        if (!(TIFM_SOCK_STATE_OCCUPIED & s_state))
  99                return 0;
 100
 101        writel(readl(sock_addr + SOCK_CONTROL) | TIFM_CTRL_LED,
 102               sock_addr + SOCK_CONTROL);
 103
 104        /* xd needs some extra time before power on */
 105        if (((readl(sock_addr + SOCK_PRESENT_STATE) >> 4) & 7)
 106            == TIFM_TYPE_XD)
 107                msleep(40);
 108
 109        writel((s_state & TIFM_CTRL_POWER_MASK) | 0x0c00,
 110               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
 127inline static void tifm_7xx1_sock_power_off(char __iomem *sock_addr)
 128{
 129        writel((~TIFM_CTRL_POWER_MASK) & readl(sock_addr + SOCK_CONTROL),
 130               sock_addr + SOCK_CONTROL);
 131}
 132
 133inline static char __iomem *
 134tifm_7xx1_sock_addr(char __iomem *base_addr, unsigned int sock_num)
 135{
 136        return base_addr + ((sock_num + 1) << 10);
 137}
 138
 139static void tifm_7xx1_switch_media(struct work_struct *work)
 140{
 141        struct tifm_adapter *fm = container_of(work, struct tifm_adapter,
 142                                               media_switcher);
 143        struct tifm_dev *sock;
 144        char __iomem *sock_addr;
 145        unsigned long flags;
 146        unsigned char media_id;
 147        unsigned int socket_change_set, cnt;
 148
 149        spin_lock_irqsave(&fm->lock, flags);
 150        socket_change_set = fm->socket_change_set;
 151        fm->socket_change_set = 0;
 152
 153        dev_dbg(fm->dev.parent, "checking media set %x\n",
 154                socket_change_set);
 155
 156        if (!socket_change_set) {
 157                spin_unlock_irqrestore(&fm->lock, flags);
 158                return;
 159        }
 160
 161        for (cnt = 0; cnt < fm->num_sockets; cnt++) {
 162                if (!(socket_change_set & (1 << cnt)))
 163                        continue;
 164                sock = fm->sockets[cnt];
 165                if (sock) {
 166                        printk(KERN_INFO
 167                               "%s : demand removing card from socket %u:%u\n",
 168                               dev_name(&fm->dev), fm->id, cnt);
 169                        fm->sockets[cnt] = NULL;
 170                        sock_addr = sock->addr;
 171                        spin_unlock_irqrestore(&fm->lock, flags);
 172                        device_unregister(&sock->dev);
 173                        spin_lock_irqsave(&fm->lock, flags);
 174                        tifm_7xx1_sock_power_off(sock_addr);
 175                        writel(0x0e00, sock_addr + SOCK_CONTROL);
 176                }
 177
 178                spin_unlock_irqrestore(&fm->lock, flags);
 179
 180                media_id = tifm_7xx1_toggle_sock_power(
 181                                tifm_7xx1_sock_addr(fm->addr, cnt));
 182
 183                // tifm_alloc_device will check if media_id is valid
 184                sock = tifm_alloc_device(fm, cnt, media_id);
 185                if (sock) {
 186                        sock->addr = tifm_7xx1_sock_addr(fm->addr, cnt);
 187
 188                        if (!device_register(&sock->dev)) {
 189                                spin_lock_irqsave(&fm->lock, flags);
 190                                if (!fm->sockets[cnt]) {
 191                                        fm->sockets[cnt] = sock;
 192                                        sock = NULL;
 193                                }
 194                                spin_unlock_irqrestore(&fm->lock, flags);
 195                        }
 196                        if (sock)
 197                                tifm_free_device(&sock->dev);
 198                }
 199                spin_lock_irqsave(&fm->lock, flags);
 200        }
 201
 202        writel(TIFM_IRQ_FIFOMASK(socket_change_set)
 203               | TIFM_IRQ_CARDMASK(socket_change_set),
 204               fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 205
 206        writel(TIFM_IRQ_FIFOMASK(socket_change_set)
 207               | TIFM_IRQ_CARDMASK(socket_change_set),
 208               fm->addr + FM_SET_INTERRUPT_ENABLE);
 209
 210        writel(TIFM_IRQ_ENABLE, fm->addr + FM_SET_INTERRUPT_ENABLE);
 211        spin_unlock_irqrestore(&fm->lock, flags);
 212}
 213
 214#ifdef CONFIG_PM
 215
 216static int tifm_7xx1_suspend(struct pci_dev *dev, pm_message_t state)
 217{
 218        struct tifm_adapter *fm = pci_get_drvdata(dev);
 219        int cnt;
 220
 221        dev_dbg(&dev->dev, "suspending host\n");
 222
 223        for (cnt = 0; cnt < fm->num_sockets; cnt++) {
 224                if (fm->sockets[cnt])
 225                        tifm_7xx1_sock_power_off(fm->sockets[cnt]->addr);
 226        }
 227
 228        pci_save_state(dev);
 229        pci_enable_wake(dev, pci_choose_state(dev, state), 0);
 230        pci_disable_device(dev);
 231        pci_set_power_state(dev, pci_choose_state(dev, state));
 232        return 0;
 233}
 234
 235static int tifm_7xx1_resume(struct pci_dev *dev)
 236{
 237        struct tifm_adapter *fm = pci_get_drvdata(dev);
 238        int rc;
 239        unsigned int good_sockets = 0, bad_sockets = 0;
 240        unsigned long flags;
 241        unsigned char new_ids[fm->num_sockets];
 242        DECLARE_COMPLETION_ONSTACK(finish_resume);
 243
 244        pci_set_power_state(dev, PCI_D0);
 245        pci_restore_state(dev);
 246        rc = pci_enable_device(dev);
 247        if (rc)
 248                return rc;
 249        pci_set_master(dev);
 250
 251        dev_dbg(&dev->dev, "resuming host\n");
 252
 253        for (rc = 0; rc < fm->num_sockets; rc++)
 254                new_ids[rc] = tifm_7xx1_toggle_sock_power(
 255                                        tifm_7xx1_sock_addr(fm->addr, rc));
 256        spin_lock_irqsave(&fm->lock, flags);
 257        for (rc = 0; rc < fm->num_sockets; rc++) {
 258                if (fm->sockets[rc]) {
 259                        if (fm->sockets[rc]->type == new_ids[rc])
 260                                good_sockets |= 1 << rc;
 261                        else
 262                                bad_sockets |= 1 << rc;
 263                }
 264        }
 265
 266        writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
 267               fm->addr + FM_SET_INTERRUPT_ENABLE);
 268        dev_dbg(&dev->dev, "change sets on resume: good %x, bad %x\n",
 269                good_sockets, bad_sockets);
 270
 271        fm->socket_change_set = 0;
 272        if (good_sockets) {
 273                fm->finish_me = &finish_resume;
 274                spin_unlock_irqrestore(&fm->lock, flags);
 275                rc = wait_for_completion_timeout(&finish_resume, HZ);
 276                dev_dbg(&dev->dev, "wait returned %d\n", rc);
 277                writel(TIFM_IRQ_FIFOMASK(good_sockets)
 278                       | TIFM_IRQ_CARDMASK(good_sockets),
 279                       fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 280                writel(TIFM_IRQ_FIFOMASK(good_sockets)
 281                       | TIFM_IRQ_CARDMASK(good_sockets),
 282                       fm->addr + FM_SET_INTERRUPT_ENABLE);
 283                spin_lock_irqsave(&fm->lock, flags);
 284                fm->finish_me = NULL;
 285                fm->socket_change_set ^= good_sockets & fm->socket_change_set;
 286        }
 287
 288        fm->socket_change_set |= bad_sockets;
 289        if (fm->socket_change_set)
 290                tifm_queue_work(&fm->media_switcher);
 291
 292        spin_unlock_irqrestore(&fm->lock, flags);
 293        writel(TIFM_IRQ_ENABLE,
 294               fm->addr + FM_SET_INTERRUPT_ENABLE);
 295
 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
 306static int tifm_7xx1_dummy_has_ms_pif(struct tifm_adapter *fm,
 307                                      struct tifm_dev *sock)
 308{
 309        return 0;
 310}
 311
 312static int tifm_7xx1_has_ms_pif(struct tifm_adapter *fm, struct tifm_dev *sock)
 313{
 314        if (((fm->num_sockets == 4) && (sock->socket_id == 2))
 315            || ((fm->num_sockets == 2) && (sock->socket_id == 0)))
 316                return 1;
 317
 318        return 0;
 319}
 320
 321static int tifm_7xx1_probe(struct pci_dev *dev,
 322                           const struct pci_device_id *dev_id)
 323{
 324        struct tifm_adapter *fm;
 325        int pci_dev_busy = 0;
 326        int rc;
 327
 328        rc = pci_set_dma_mask(dev, DMA_BIT_MASK(32));
 329        if (rc)
 330                return rc;
 331
 332        rc = pci_enable_device(dev);
 333        if (rc)
 334                return rc;
 335
 336        pci_set_master(dev);
 337
 338        rc = pci_request_regions(dev, DRIVER_NAME);
 339        if (rc) {
 340                pci_dev_busy = 1;
 341                goto err_out;
 342        }
 343
 344        pci_intx(dev, 1);
 345
 346        fm = tifm_alloc_adapter(dev->device == PCI_DEVICE_ID_TI_XX21_XX11_FM
 347                                ? 4 : 2, &dev->dev);
 348        if (!fm) {
 349                rc = -ENOMEM;
 350                goto err_out_int;
 351        }
 352
 353        INIT_WORK(&fm->media_switcher, tifm_7xx1_switch_media);
 354        fm->eject = tifm_7xx1_eject;
 355        fm->has_ms_pif = tifm_7xx1_has_ms_pif;
 356        pci_set_drvdata(dev, fm);
 357
 358        fm->addr = pci_ioremap_bar(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
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