drivers/misc/tifm_7xx1.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  tifm_7xx1.c - TI FlashMedia driver
   4  *
   5  *  Copyright (C) 2006 Alex Dubov <oakad@yahoo.com>
   6  */
   7
   8 #include <linux/tifm.h>
   9 #include <linux/dma-mapping.h>
  10 #include <linux/module.h>
  11
  12 #define DRIVER_NAME "tifm_7xx1"
  13 #define DRIVER_VERSION "0.8"
  14
  15 #define TIFM_IRQ_ENABLE           0x80000000
  16 #define TIFM_IRQ_SOCKMASK(x)      (x)
  17 #define TIFM_IRQ_CARDMASK(x)      ((x) << 8)
  18 #define TIFM_IRQ_FIFOMASK(x)      ((x) << 16)
  19 #define TIFM_IRQ_SETALL           0xffffffff
  20
  21 static void tifm_7xx1_dummy_eject(struct tifm_adapter *fm,
  22                                   struct tifm_dev *sock)
  23 {
  24 }
  25
  26 static void tifm_7xx1_eject(struct tifm_adapter *fm, struct tifm_dev *sock)
  27 {
  28         unsigned long flags;
  29
  30         spin_lock_irqsave(&fm->lock, flags);
  31         fm->socket_change_set |= 1 << sock->socket_id;
  32         tifm_queue_work(&fm->media_switcher);
  33         spin_unlock_irqrestore(&fm->lock, flags);
  34 }
  35
  36 static irqreturn_t tifm_7xx1_isr(int irq, void *dev_id)
  37 {
  38         struct tifm_adapter *fm = dev_id;
  39         struct tifm_dev *sock;
  40         unsigned int irq_status, cnt;
  41
  42         spin_lock(&fm->lock);
  43         irq_status = readl(fm->addr + FM_INTERRUPT_STATUS);
  44         if (irq_status == 0 || irq_status == (~0)) {
  45                 spin_unlock(&fm->lock);
  46                 return IRQ_NONE;
  47         }
  48
  49         if (irq_status & TIFM_IRQ_ENABLE) {
  50                 writel(TIFM_IRQ_ENABLE, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
  51
  52                 for (cnt = 0; cnt < fm->num_sockets; cnt++) {
  53                         sock = fm->sockets[cnt];
  54                         if (sock) {
  55                                 if ((irq_status >> cnt) & TIFM_IRQ_FIFOMASK(1))
  56                                         sock->data_event(sock);
  57                                 if ((irq_status >> cnt) & TIFM_IRQ_CARDMASK(1))
  58                                         sock->card_event(sock);
  59                         }
  60                 }
  61
  62                 fm->socket_change_set |= irq_status
  63                                          & ((1 << fm->num_sockets) - 1);
  64         }
  65         writel(irq_status, fm->addr + FM_INTERRUPT_STATUS);
  66
  67         if (fm->finish_me)
  68                 complete_all(fm->finish_me);
  69         else if (!fm->socket_change_set)
  70                 writel(TIFM_IRQ_ENABLE, fm->addr + FM_SET_INTERRUPT_ENABLE);
  71         else
  72                 tifm_queue_work(&fm->media_switcher);
  73
  74         spin_unlock(&fm->lock);
  75         return IRQ_HANDLED;
  76 }
  77
  78 static unsigned char tifm_7xx1_toggle_sock_power(char __iomem *sock_addr)
  79 {
  80         unsigned int s_state;
  81         int cnt;
  82
  83         writel(0x0e00, sock_addr + SOCK_CONTROL);
  84
  85         for (cnt = 16; cnt <= 256; cnt <<= 1) {
  86                 if (!(TIFM_SOCK_STATE_POWERED
  87                       & readl(sock_addr + SOCK_PRESENT_STATE)))
  88                         break;
  89
  90                 msleep(cnt);
  91         }
  92
  93         s_state = readl(sock_addr + SOCK_PRESENT_STATE);
  94         if (!(TIFM_SOCK_STATE_OCCUPIED & s_state))
  95                 return 0;
  96
  97         writel(readl(sock_addr + SOCK_CONTROL) | TIFM_CTRL_LED,
  98                sock_addr + SOCK_CONTROL);
  99
 100         /* xd needs some extra time before power on */
 101         if (((readl(sock_addr + SOCK_PRESENT_STATE) >> 4) & 7)
 102             == TIFM_TYPE_XD)
 103                 msleep(40);
 104
 105         writel((s_state & TIFM_CTRL_POWER_MASK) | 0x0c00,
 106                sock_addr + SOCK_CONTROL);
 107         /* wait for power to stabilize */
 108         msleep(20);
 109         for (cnt = 16; cnt <= 256; cnt <<= 1) {
 110                 if ((TIFM_SOCK_STATE_POWERED
 111                      & readl(sock_addr + SOCK_PRESENT_STATE)))
 112                         break;
 113
 114                 msleep(cnt);
 115         }
 116
 117         writel(readl(sock_addr + SOCK_CONTROL) & (~TIFM_CTRL_LED),
 118                sock_addr + SOCK_CONTROL);
 119
 120         return (readl(sock_addr + SOCK_PRESENT_STATE) >> 4) & 7;
 121 }
 122
 123 inline static void tifm_7xx1_sock_power_off(char __iomem *sock_addr)
 124 {
 125         writel((~TIFM_CTRL_POWER_MASK) & readl(sock_addr + SOCK_CONTROL),
 126                sock_addr + SOCK_CONTROL);
 127 }
 128
 129 inline static char __iomem *
 130 tifm_7xx1_sock_addr(char __iomem *base_addr, unsigned int sock_num)
 131 {
 132         return base_addr + ((sock_num + 1) << 10);
 133 }
 134
 135 static void tifm_7xx1_switch_media(struct work_struct *work)
 136 {
 137         struct tifm_adapter *fm = container_of(work, struct tifm_adapter,
 138                                                media_switcher);
 139         struct tifm_dev *sock;
 140         char __iomem *sock_addr;
 141         unsigned long flags;
 142         unsigned char media_id;
 143         unsigned int socket_change_set, cnt;
 144
 145         spin_lock_irqsave(&fm->lock, flags);
 146         socket_change_set = fm->socket_change_set;
 147         fm->socket_change_set = 0;
 148
 149         dev_dbg(fm->dev.parent, "checking media set %x\n",
 150                 socket_change_set);
 151
 152         if (!socket_change_set) {
 153                 spin_unlock_irqrestore(&fm->lock, flags);
 154                 return;
 155         }
 156
 157         for (cnt = 0; cnt < fm->num_sockets; cnt++) {
 158                 if (!(socket_change_set & (1 << cnt)))
 159                         continue;
 160                 sock = fm->sockets[cnt];
 161                 if (sock) {
 162                         printk(KERN_INFO
 163                                "%s : demand removing card from socket %u:%u\n",
 164                                dev_name(&fm->dev), fm->id, cnt);
 165                         fm->sockets[cnt] = NULL;
 166                         sock_addr = sock->addr;
 167                         spin_unlock_irqrestore(&fm->lock, flags);
 168                         device_unregister(&sock->dev);
 169                         spin_lock_irqsave(&fm->lock, flags);
 170                         tifm_7xx1_sock_power_off(sock_addr);
 171                         writel(0x0e00, sock_addr + SOCK_CONTROL);
 172                 }
 173
 174                 spin_unlock_irqrestore(&fm->lock, flags);
 175
 176                 media_id = tifm_7xx1_toggle_sock_power(
 177                                 tifm_7xx1_sock_addr(fm->addr, cnt));
 178
 179                 // tifm_alloc_device will check if media_id is valid
 180                 sock = tifm_alloc_device(fm, cnt, media_id);
 181                 if (sock) {
 182                         sock->addr = tifm_7xx1_sock_addr(fm->addr, cnt);
 183
 184                         if (!device_register(&sock->dev)) {
 185                                 spin_lock_irqsave(&fm->lock, flags);
 186                                 if (!fm->sockets[cnt]) {
 187                                         fm->sockets[cnt] = sock;
 188                                         sock = NULL;
 189                                 }
 190                                 spin_unlock_irqrestore(&fm->lock, flags);
 191                         }
 192                         if (sock)
 193                                 tifm_free_device(&sock->dev);
 194                 }
 195                 spin_lock_irqsave(&fm->lock, flags);
 196         }
 197
 198         writel(TIFM_IRQ_FIFOMASK(socket_change_set)
 199                | TIFM_IRQ_CARDMASK(socket_change_set),
 200                fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 201
 202         writel(TIFM_IRQ_FIFOMASK(socket_change_set)
 203                | TIFM_IRQ_CARDMASK(socket_change_set),
 204                fm->addr + FM_SET_INTERRUPT_ENABLE);
 205
 206         writel(TIFM_IRQ_ENABLE, fm->addr + FM_SET_INTERRUPT_ENABLE);
 207         spin_unlock_irqrestore(&fm->lock, flags);
 208 }
 209
 210 static int __maybe_unused tifm_7xx1_suspend(struct device *dev_d)
 211 {
 212         struct pci_dev *dev = to_pci_dev(dev_d);
 213         struct tifm_adapter *fm = pci_get_drvdata(dev);
 214         int cnt;
 215
 216         dev_dbg(&dev->dev, "suspending host\n");
 217
 218         for (cnt = 0; cnt < fm->num_sockets; cnt++) {
 219                 if (fm->sockets[cnt])
 220                         tifm_7xx1_sock_power_off(fm->sockets[cnt]->addr);
 221         }
 222
 223         device_wakeup_disable(dev_d);
 224         return 0;
 225 }
 226
 227 static int __maybe_unused tifm_7xx1_resume(struct device *dev_d)
 228 {
 229         struct pci_dev *dev = to_pci_dev(dev_d);
 230         struct tifm_adapter *fm = pci_get_drvdata(dev);
 231         int rc;
 232         unsigned long timeout;
 233         unsigned int good_sockets = 0, bad_sockets = 0;
 234         unsigned long flags;
 235         /* Maximum number of entries is 4 */
 236         unsigned char new_ids[4];
 237         DECLARE_COMPLETION_ONSTACK(finish_resume);
 238
 239         if (WARN_ON(fm->num_sockets > ARRAY_SIZE(new_ids)))
 240                 return -ENXIO;
 241
 242         pci_set_master(dev);
 243
 244         dev_dbg(&dev->dev, "resuming host\n");
 245
 246         for (rc = 0; rc < fm->num_sockets; rc++)
 247                 new_ids[rc] = tifm_7xx1_toggle_sock_power(
 248                                         tifm_7xx1_sock_addr(fm->addr, rc));
 249         spin_lock_irqsave(&fm->lock, flags);
 250         for (rc = 0; rc < fm->num_sockets; rc++) {
 251                 if (fm->sockets[rc]) {
 252                         if (fm->sockets[rc]->type == new_ids[rc])
 253                                 good_sockets |= 1 << rc;
 254                         else
 255                                 bad_sockets |= 1 << rc;
 256                 }
 257         }
 258
 259         writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
 260                fm->addr + FM_SET_INTERRUPT_ENABLE);
 261         dev_dbg(&dev->dev, "change sets on resume: good %x, bad %x\n",
 262                 good_sockets, bad_sockets);
 263
 264         fm->socket_change_set = 0;
 265         if (good_sockets) {
 266                 fm->finish_me = &finish_resume;
 267                 spin_unlock_irqrestore(&fm->lock, flags);
 268                 timeout = wait_for_completion_timeout(&finish_resume, HZ);
 269                 dev_dbg(&dev->dev, "wait returned %lu\n", timeout);
 270                 writel(TIFM_IRQ_FIFOMASK(good_sockets)
 271                        | TIFM_IRQ_CARDMASK(good_sockets),
 272                        fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 273                 writel(TIFM_IRQ_FIFOMASK(good_sockets)
 274                        | TIFM_IRQ_CARDMASK(good_sockets),
 275                        fm->addr + FM_SET_INTERRUPT_ENABLE);
 276                 spin_lock_irqsave(&fm->lock, flags);
 277                 fm->finish_me = NULL;
 278                 fm->socket_change_set ^= good_sockets & fm->socket_change_set;
 279         }
 280
 281         fm->socket_change_set |= bad_sockets;
 282         if (fm->socket_change_set)
 283                 tifm_queue_work(&fm->media_switcher);
 284
 285         spin_unlock_irqrestore(&fm->lock, flags);
 286         writel(TIFM_IRQ_ENABLE,
 287                fm->addr + FM_SET_INTERRUPT_ENABLE);
 288
 289         return 0;
 290 }
 291
 292 static int tifm_7xx1_dummy_has_ms_pif(struct tifm_adapter *fm,
 293                                       struct tifm_dev *sock)
 294 {
 295         return 0;
 296 }
 297
 298 static int tifm_7xx1_has_ms_pif(struct tifm_adapter *fm, struct tifm_dev *sock)
 299 {
 300         if (((fm->num_sockets == 4) && (sock->socket_id == 2))
 301             || ((fm->num_sockets == 2) && (sock->socket_id == 0)))
 302                 return 1;
 303
 304         return 0;
 305 }
 306
 307 static int tifm_7xx1_probe(struct pci_dev *dev,
 308                            const struct pci_device_id *dev_id)
 309 {
 310         struct tifm_adapter *fm;
 311         int pci_dev_busy = 0;
 312         int rc;
 313
 314         rc = pci_set_dma_mask(dev, DMA_BIT_MASK(32));
 315         if (rc)
 316                 return rc;
 317
 318         rc = pci_enable_device(dev);
 319         if (rc)
 320                 return rc;
 321
 322         pci_set_master(dev);
 323
 324         rc = pci_request_regions(dev, DRIVER_NAME);
 325         if (rc) {
 326                 pci_dev_busy = 1;
 327                 goto err_out;
 328         }
 329
 330         pci_intx(dev, 1);
 331
 332         fm = tifm_alloc_adapter(dev->device == PCI_DEVICE_ID_TI_XX21_XX11_FM
 333                                 ? 4 : 2, &dev->dev);
 334         if (!fm) {
 335                 rc = -ENOMEM;
 336                 goto err_out_int;
 337         }
 338
 339         INIT_WORK(&fm->media_switcher, tifm_7xx1_switch_media);
 340         fm->eject = tifm_7xx1_eject;
 341         fm->has_ms_pif = tifm_7xx1_has_ms_pif;
 342         pci_set_drvdata(dev, fm);
 343
 344         fm->addr = pci_ioremap_bar(dev, 0);
 345         if (!fm->addr) {
 346                 rc = -ENODEV;
 347                 goto err_out_free;
 348         }
 349
 350         rc = request_irq(dev->irq, tifm_7xx1_isr, IRQF_SHARED, DRIVER_NAME, fm);
 351         if (rc)
 352                 goto err_out_unmap;
 353
 354         rc = tifm_add_adapter(fm);
 355         if (rc)
 356                 goto err_out_irq;
 357
 358         writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
 359                fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 360         writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
 361                fm->addr + FM_SET_INTERRUPT_ENABLE);
 362         return 0;
 363
 364 err_out_irq:
 365         free_irq(dev->irq, fm);
 366 err_out_unmap:
 367         iounmap(fm->addr);
 368 err_out_free:
 369         tifm_free_adapter(fm);
 370 err_out_int:
 371         pci_intx(dev, 0);
 372         pci_release_regions(dev);
 373 err_out:
 374         if (!pci_dev_busy)
 375                 pci_disable_device(dev);
 376         return rc;
 377 }
 378
 379 static void tifm_7xx1_remove(struct pci_dev *dev)
 380 {
 381         struct tifm_adapter *fm = pci_get_drvdata(dev);
 382         int cnt;
 383
 384         fm->eject = tifm_7xx1_dummy_eject;
 385         fm->has_ms_pif = tifm_7xx1_dummy_has_ms_pif;
 386         writel(TIFM_IRQ_SETALL, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
 387         free_irq(dev->irq, fm);
 388
 389         tifm_remove_adapter(fm);
 390
 391         for (cnt = 0; cnt < fm->num_sockets; cnt++)
 392                 tifm_7xx1_sock_power_off(tifm_7xx1_sock_addr(fm->addr, cnt));
 393
 394         iounmap(fm->addr);
 395         pci_intx(dev, 0);
 396         pci_release_regions(dev);
 397
 398         pci_disable_device(dev);
 399         tifm_free_adapter(fm);
 400 }
 401
 402 static const struct pci_device_id tifm_7xx1_pci_tbl[] = {
 403         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX21_XX11_FM, PCI_ANY_ID,
 404           PCI_ANY_ID, 0, 0, 0 }, /* xx21 - the one I have */
 405         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX12_FM, PCI_ANY_ID,
 406           PCI_ANY_ID, 0, 0, 0 },
 407         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX20_FM, PCI_ANY_ID,
 408           PCI_ANY_ID, 0, 0, 0 },
 409         { }
 410 };
 411
 412 static SIMPLE_DEV_PM_OPS(tifm_7xx1_pm_ops, tifm_7xx1_suspend, tifm_7xx1_resume);
 413
 414 static struct pci_driver tifm_7xx1_driver = {
 415         .name = DRIVER_NAME,
 416         .id_table = tifm_7xx1_pci_tbl,
 417         .probe = tifm_7xx1_probe,
 418         .remove = tifm_7xx1_remove,
 419         .driver.pm = &tifm_7xx1_pm_ops,
 420 };
 421
 422 module_pci_driver(tifm_7xx1_driver);
 423 MODULE_AUTHOR("Alex Dubov");
 424 MODULE_DESCRIPTION("TI FlashMedia host driver");
 425 MODULE_LICENSE("GPL");
 426 MODULE_DEVICE_TABLE(pci, tifm_7xx1_pci_tbl);
 427 MODULE_VERSION(DRIVER_VERSION);