drivers/misc/cardreader/rtsx_pcr.c

   1 /* Driver for Realtek PCI-Express card reader
   2  *
   3  * Copyright(c) 2009-2013 Realtek Semiconductor Corp. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation; either version 2, or (at your option) any
   8  * later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, see <http://www.gnu.org/licenses/>.
  17  *
  18  * Author:
  19  *   Wei WANG <[email protected]>
  20  */
  21
  22 #include <linux/pci.h>
  23 #include <linux/module.h>
  24 #include <linux/slab.h>
  25 #include <linux/dma-mapping.h>
  26 #include <linux/highmem.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/delay.h>
  29 #include <linux/idr.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/mfd/core.h>
  32 #include <linux/rtsx_pci.h>
  33 #include <linux/mmc/card.h>
  34 #include <asm/unaligned.h>
  35
  36 #include "rtsx_pcr.h"
  37
  38 static bool msi_en = true;
  39 module_param(msi_en, bool, S_IRUGO | S_IWUSR);
  40 MODULE_PARM_DESC(msi_en, "Enable MSI");
  41
  42 static DEFINE_IDR(rtsx_pci_idr);
  43 static DEFINE_SPINLOCK(rtsx_pci_lock);
  44
  45 static struct mfd_cell rtsx_pcr_cells[] = {
  46         [RTSX_SD_CARD] = {
  47                 .name = DRV_NAME_RTSX_PCI_SDMMC,
  48         },
  49         [RTSX_MS_CARD] = {
  50                 .name = DRV_NAME_RTSX_PCI_MS,
  51         },
  52 };
  53
  54 static const struct pci_device_id rtsx_pci_ids[] = {
  55         { PCI_DEVICE(0x10EC, 0x5209), PCI_CLASS_OTHERS << 16, 0xFF0000 },
  56         { PCI_DEVICE(0x10EC, 0x5229), PCI_CLASS_OTHERS << 16, 0xFF0000 },
  57         { PCI_DEVICE(0x10EC, 0x5289), PCI_CLASS_OTHERS << 16, 0xFF0000 },
  58         { PCI_DEVICE(0x10EC, 0x5227), PCI_CLASS_OTHERS << 16, 0xFF0000 },
  59         { PCI_DEVICE(0x10EC, 0x522A), PCI_CLASS_OTHERS << 16, 0xFF0000 },
  60         { PCI_DEVICE(0x10EC, 0x5249), PCI_CLASS_OTHERS << 16, 0xFF0000 },
  61         { PCI_DEVICE(0x10EC, 0x5287), PCI_CLASS_OTHERS << 16, 0xFF0000 },
  62         { PCI_DEVICE(0x10EC, 0x5286), PCI_CLASS_OTHERS << 16, 0xFF0000 },
  63         { PCI_DEVICE(0x10EC, 0x524A), PCI_CLASS_OTHERS << 16, 0xFF0000 },
  64         { PCI_DEVICE(0x10EC, 0x525A), PCI_CLASS_OTHERS << 16, 0xFF0000 },
  65         { PCI_DEVICE(0x10EC, 0x5260), PCI_CLASS_OTHERS << 16, 0xFF0000 },
  66         { 0, }
  67 };
  68
  69 MODULE_DEVICE_TABLE(pci, rtsx_pci_ids);
  70
  71 static inline void rtsx_pci_enable_aspm(struct rtsx_pcr *pcr)
  72 {
  73         rtsx_pci_update_cfg_byte(pcr, pcr->pcie_cap + PCI_EXP_LNKCTL,
  74                 0xFC, pcr->aspm_en);
  75 }
  76
  77 static inline void rtsx_pci_disable_aspm(struct rtsx_pcr *pcr)
  78 {
  79         rtsx_pci_update_cfg_byte(pcr, pcr->pcie_cap + PCI_EXP_LNKCTL,
  80                 0xFC, 0);
  81 }
  82
  83 static int rtsx_comm_set_ltr_latency(struct rtsx_pcr *pcr, u32 latency)
  84 {
  85         rtsx_pci_write_register(pcr, MSGTXDATA0,
  86                                 MASK_8_BIT_DEF, (u8) (latency & 0xFF));
  87         rtsx_pci_write_register(pcr, MSGTXDATA1,
  88                                 MASK_8_BIT_DEF, (u8)((latency >> 8) & 0xFF));
  89         rtsx_pci_write_register(pcr, MSGTXDATA2,
  90                                 MASK_8_BIT_DEF, (u8)((latency >> 16) & 0xFF));
  91         rtsx_pci_write_register(pcr, MSGTXDATA3,
  92                                 MASK_8_BIT_DEF, (u8)((latency >> 24) & 0xFF));
  93         rtsx_pci_write_register(pcr, LTR_CTL, LTR_TX_EN_MASK |
  94                 LTR_LATENCY_MODE_MASK, LTR_TX_EN_1 | LTR_LATENCY_MODE_SW);
  95
  96         return 0;
  97 }
  98
  99 int rtsx_set_ltr_latency(struct rtsx_pcr *pcr, u32 latency)
 100 {
 101         if (pcr->ops->set_ltr_latency)
 102                 return pcr->ops->set_ltr_latency(pcr, latency);
 103         else
 104                 return rtsx_comm_set_ltr_latency(pcr, latency);
 105 }
 106
 107 static void rtsx_comm_set_aspm(struct rtsx_pcr *pcr, bool enable)
 108 {
 109         struct rtsx_cr_option *option = &pcr->option;
 110
 111         if (pcr->aspm_enabled == enable)
 112                 return;
 113
 114         if (option->dev_aspm_mode == DEV_ASPM_DYNAMIC) {
 115                 if (enable)
 116                         rtsx_pci_enable_aspm(pcr);
 117                 else
 118                         rtsx_pci_disable_aspm(pcr);
 119         } else if (option->dev_aspm_mode == DEV_ASPM_BACKDOOR) {
 120                 u8 mask = FORCE_ASPM_VAL_MASK;
 121                 u8 val = 0;
 122
 123                 if (enable)
 124                         val = pcr->aspm_en;
 125                 rtsx_pci_write_register(pcr, ASPM_FORCE_CTL,  mask, val);
 126         }
 127
 128         pcr->aspm_enabled = enable;
 129 }
 130
 131 static void rtsx_disable_aspm(struct rtsx_pcr *pcr)
 132 {
 133         if (pcr->ops->set_aspm)
 134                 pcr->ops->set_aspm(pcr, false);
 135         else
 136                 rtsx_comm_set_aspm(pcr, false);
 137 }
 138
 139 int rtsx_set_l1off_sub(struct rtsx_pcr *pcr, u8 val)
 140 {
 141         rtsx_pci_write_register(pcr, L1SUB_CONFIG3, 0xFF, val);
 142
 143         return 0;
 144 }
 145
 146 static void rtsx_set_l1off_sub_cfg_d0(struct rtsx_pcr *pcr, int active)
 147 {
 148         if (pcr->ops->set_l1off_cfg_sub_d0)
 149                 pcr->ops->set_l1off_cfg_sub_d0(pcr, active);
 150 }
 151
 152 static void rtsx_comm_pm_full_on(struct rtsx_pcr *pcr)
 153 {
 154         struct rtsx_cr_option *option = &pcr->option;
 155
 156         rtsx_disable_aspm(pcr);
 157
 158         if (option->ltr_enabled)
 159                 rtsx_set_ltr_latency(pcr, option->ltr_active_latency);
 160
 161         if (rtsx_check_dev_flag(pcr, LTR_L1SS_PWR_GATE_EN))
 162                 rtsx_set_l1off_sub_cfg_d0(pcr, 1);
 163 }
 164
 165 static void rtsx_pm_full_on(struct rtsx_pcr *pcr)
 166 {
 167         if (pcr->ops->full_on)
 168                 pcr->ops->full_on(pcr);
 169         else
 170                 rtsx_comm_pm_full_on(pcr);
 171 }
 172
 173 void rtsx_pci_start_run(struct rtsx_pcr *pcr)
 174 {
 175         /* If pci device removed, don't queue idle work any more */
 176         if (pcr->remove_pci)
 177                 return;
 178
 179         if (pcr->state != PDEV_STAT_RUN) {
 180                 pcr->state = PDEV_STAT_RUN;
 181                 if (pcr->ops->enable_auto_blink)
 182                         pcr->ops->enable_auto_blink(pcr);
 183                 rtsx_pm_full_on(pcr);
 184         }
 185
 186         mod_delayed_work(system_wq, &pcr->idle_work, msecs_to_jiffies(200));
 187 }
 188 EXPORT_SYMBOL_GPL(rtsx_pci_start_run);
 189
 190 int rtsx_pci_write_register(struct rtsx_pcr *pcr, u16 addr, u8 mask, u8 data)
 191 {
 192         int i;
 193         u32 val = HAIMR_WRITE_START;
 194
 195         val |= (u32)(addr & 0x3FFF) << 16;
 196         val |= (u32)mask << 8;
 197         val |= (u32)data;
 198
 199         rtsx_pci_writel(pcr, RTSX_HAIMR, val);
 200
 201         for (i = 0; i < MAX_RW_REG_CNT; i++) {
 202                 val = rtsx_pci_readl(pcr, RTSX_HAIMR);
 203                 if ((val & HAIMR_TRANS_END) == 0) {
 204                         if (data != (u8)val)
 205                                 return -EIO;
 206                         return 0;
 207                 }
 208         }
 209
 210         return -ETIMEDOUT;
 211 }
 212 EXPORT_SYMBOL_GPL(rtsx_pci_write_register);
 213
 214 int rtsx_pci_read_register(struct rtsx_pcr *pcr, u16 addr, u8 *data)
 215 {
 216         u32 val = HAIMR_READ_START;
 217         int i;
 218
 219         val |= (u32)(addr & 0x3FFF) << 16;
 220         rtsx_pci_writel(pcr, RTSX_HAIMR, val);
 221
 222         for (i = 0; i < MAX_RW_REG_CNT; i++) {
 223                 val = rtsx_pci_readl(pcr, RTSX_HAIMR);
 224                 if ((val & HAIMR_TRANS_END) == 0)
 225                         break;
 226         }
 227
 228         if (i >= MAX_RW_REG_CNT)
 229                 return -ETIMEDOUT;
 230
 231         if (data)
 232                 *data = (u8)(val & 0xFF);
 233
 234         return 0;
 235 }
 236 EXPORT_SYMBOL_GPL(rtsx_pci_read_register);
 237
 238 int __rtsx_pci_write_phy_register(struct rtsx_pcr *pcr, u8 addr, u16 val)
 239 {
 240         int err, i, finished = 0;
 241         u8 tmp;
 242
 243         rtsx_pci_init_cmd(pcr);
 244
 245         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PHYDATA0, 0xFF, (u8)val);
 246         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PHYDATA1, 0xFF, (u8)(val >> 8));
 247         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PHYADDR, 0xFF, addr);
 248         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PHYRWCTL, 0xFF, 0x81);
 249
 250         err = rtsx_pci_send_cmd(pcr, 100);
 251         if (err < 0)
 252                 return err;
 253
 254         for (i = 0; i < 100000; i++) {
 255                 err = rtsx_pci_read_register(pcr, PHYRWCTL, &tmp);
 256                 if (err < 0)
 257                         return err;
 258
 259                 if (!(tmp & 0x80)) {
 260                         finished = 1;
 261                         break;
 262                 }
 263         }
 264
 265         if (!finished)
 266                 return -ETIMEDOUT;
 267
 268         return 0;
 269 }
 270
 271 int rtsx_pci_write_phy_register(struct rtsx_pcr *pcr, u8 addr, u16 val)
 272 {
 273         if (pcr->ops->write_phy)
 274                 return pcr->ops->write_phy(pcr, addr, val);
 275
 276         return __rtsx_pci_write_phy_register(pcr, addr, val);
 277 }
 278 EXPORT_SYMBOL_GPL(rtsx_pci_write_phy_register);
 279
 280 int __rtsx_pci_read_phy_register(struct rtsx_pcr *pcr, u8 addr, u16 *val)
 281 {
 282         int err, i, finished = 0;
 283         u16 data;
 284         u8 *ptr, tmp;
 285
 286         rtsx_pci_init_cmd(pcr);
 287
 288         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PHYADDR, 0xFF, addr);
 289         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PHYRWCTL, 0xFF, 0x80);
 290
 291         err = rtsx_pci_send_cmd(pcr, 100);
 292         if (err < 0)
 293                 return err;
 294
 295         for (i = 0; i < 100000; i++) {
 296                 err = rtsx_pci_read_register(pcr, PHYRWCTL, &tmp);
 297                 if (err < 0)
 298                         return err;
 299
 300                 if (!(tmp & 0x80)) {
 301                         finished = 1;
 302                         break;
 303                 }
 304         }
 305
 306         if (!finished)
 307                 return -ETIMEDOUT;
 308
 309         rtsx_pci_init_cmd(pcr);
 310
 311         rtsx_pci_add_cmd(pcr, READ_REG_CMD, PHYDATA0, 0, 0);
 312         rtsx_pci_add_cmd(pcr, READ_REG_CMD, PHYDATA1, 0, 0);
 313
 314         err = rtsx_pci_send_cmd(pcr, 100);
 315         if (err < 0)
 316                 return err;
 317
 318         ptr = rtsx_pci_get_cmd_data(pcr);
 319         data = ((u16)ptr[1] << 8) | ptr[0];
 320
 321         if (val)
 322                 *val = data;
 323
 324         return 0;
 325 }
 326
 327 int rtsx_pci_read_phy_register(struct rtsx_pcr *pcr, u8 addr, u16 *val)
 328 {
 329         if (pcr->ops->read_phy)
 330                 return pcr->ops->read_phy(pcr, addr, val);
 331
 332         return __rtsx_pci_read_phy_register(pcr, addr, val);
 333 }
 334 EXPORT_SYMBOL_GPL(rtsx_pci_read_phy_register);
 335
 336 void rtsx_pci_stop_cmd(struct rtsx_pcr *pcr)
 337 {
 338         if (pcr->ops->stop_cmd)
 339                 return pcr->ops->stop_cmd(pcr);
 340
 341         rtsx_pci_writel(pcr, RTSX_HCBCTLR, STOP_CMD);
 342         rtsx_pci_writel(pcr, RTSX_HDBCTLR, STOP_DMA);
 343
 344         rtsx_pci_write_register(pcr, DMACTL, 0x80, 0x80);
 345         rtsx_pci_write_register(pcr, RBCTL, 0x80, 0x80);
 346 }
 347 EXPORT_SYMBOL_GPL(rtsx_pci_stop_cmd);
 348
 349 void rtsx_pci_add_cmd(struct rtsx_pcr *pcr,
 350                 u8 cmd_type, u16 reg_addr, u8 mask, u8 data)
 351 {
 352         unsigned long flags;
 353         u32 val = 0;
 354         u32 *ptr = (u32 *)(pcr->host_cmds_ptr);
 355
 356         val |= (u32)(cmd_type & 0x03) << 30;
 357         val |= (u32)(reg_addr & 0x3FFF) << 16;
 358         val |= (u32)mask << 8;
 359         val |= (u32)data;
 360
 361         spin_lock_irqsave(&pcr->lock, flags);
 362         ptr += pcr->ci;
 363         if (pcr->ci < (HOST_CMDS_BUF_LEN / 4)) {
 364                 put_unaligned_le32(val, ptr);
 365                 ptr++;
 366                 pcr->ci++;
 367         }
 368         spin_unlock_irqrestore(&pcr->lock, flags);
 369 }
 370 EXPORT_SYMBOL_GPL(rtsx_pci_add_cmd);
 371
 372 void rtsx_pci_send_cmd_no_wait(struct rtsx_pcr *pcr)
 373 {
 374         u32 val = 1 << 31;
 375
 376         rtsx_pci_writel(pcr, RTSX_HCBAR, pcr->host_cmds_addr);
 377
 378         val |= (u32)(pcr->ci * 4) & 0x00FFFFFF;
 379         /* Hardware Auto Response */
 380         val |= 0x40000000;
 381         rtsx_pci_writel(pcr, RTSX_HCBCTLR, val);
 382 }
 383 EXPORT_SYMBOL_GPL(rtsx_pci_send_cmd_no_wait);
 384
 385 int rtsx_pci_send_cmd(struct rtsx_pcr *pcr, int timeout)
 386 {
 387         struct completion trans_done;
 388         u32 val = 1 << 31;
 389         long timeleft;
 390         unsigned long flags;
 391         int err = 0;
 392
 393         spin_lock_irqsave(&pcr->lock, flags);
 394
 395         /* set up data structures for the wakeup system */
 396         pcr->done = &trans_done;
 397         pcr->trans_result = TRANS_NOT_READY;
 398         init_completion(&trans_done);
 399
 400         rtsx_pci_writel(pcr, RTSX_HCBAR, pcr->host_cmds_addr);
 401
 402         val |= (u32)(pcr->ci * 4) & 0x00FFFFFF;
 403         /* Hardware Auto Response */
 404         val |= 0x40000000;
 405         rtsx_pci_writel(pcr, RTSX_HCBCTLR, val);
 406
 407         spin_unlock_irqrestore(&pcr->lock, flags);
 408
 409         /* Wait for TRANS_OK_INT */
 410         timeleft = wait_for_completion_interruptible_timeout(
 411                         &trans_done, msecs_to_jiffies(timeout));
 412         if (timeleft <= 0) {
 413                 pcr_dbg(pcr, "Timeout (%s %d)\n", __func__, __LINE__);
 414                 err = -ETIMEDOUT;
 415                 goto finish_send_cmd;
 416         }
 417
 418         spin_lock_irqsave(&pcr->lock, flags);
 419         if (pcr->trans_result == TRANS_RESULT_FAIL)
 420                 err = -EINVAL;
 421         else if (pcr->trans_result == TRANS_RESULT_OK)
 422                 err = 0;
 423         else if (pcr->trans_result == TRANS_NO_DEVICE)
 424                 err = -ENODEV;
 425         spin_unlock_irqrestore(&pcr->lock, flags);
 426
 427 finish_send_cmd:
 428         spin_lock_irqsave(&pcr->lock, flags);
 429         pcr->done = NULL;
 430         spin_unlock_irqrestore(&pcr->lock, flags);
 431
 432         if ((err < 0) && (err != -ENODEV))
 433                 rtsx_pci_stop_cmd(pcr);
 434
 435         if (pcr->finish_me)
 436                 complete(pcr->finish_me);
 437
 438         return err;
 439 }
 440 EXPORT_SYMBOL_GPL(rtsx_pci_send_cmd);
 441
 442 static void rtsx_pci_add_sg_tbl(struct rtsx_pcr *pcr,
 443                 dma_addr_t addr, unsigned int len, int end)
 444 {
 445         u64 *ptr = (u64 *)(pcr->host_sg_tbl_ptr) + pcr->sgi;
 446         u64 val;
 447         u8 option = RTSX_SG_VALID | RTSX_SG_TRANS_DATA;
 448
 449         pcr_dbg(pcr, "DMA addr: 0x%x, Len: 0x%x\n", (unsigned int)addr, len);
 450
 451         if (end)
 452                 option |= RTSX_SG_END;
 453         val = ((u64)addr << 32) | ((u64)len << 12) | option;
 454
 455         put_unaligned_le64(val, ptr);
 456         pcr->sgi++;
 457 }
 458
 459 int rtsx_pci_transfer_data(struct rtsx_pcr *pcr, struct scatterlist *sglist,
 460                 int num_sg, bool read, int timeout)
 461 {
 462         int err = 0, count;
 463
 464         pcr_dbg(pcr, "--> %s: num_sg = %d\n", __func__, num_sg);
 465         count = rtsx_pci_dma_map_sg(pcr, sglist, num_sg, read);
 466         if (count < 1)
 467                 return -EINVAL;
 468         pcr_dbg(pcr, "DMA mapping count: %d\n", count);
 469
 470         err = rtsx_pci_dma_transfer(pcr, sglist, count, read, timeout);
 471
 472         rtsx_pci_dma_unmap_sg(pcr, sglist, num_sg, read);
 473
 474         return err;
 475 }
 476 EXPORT_SYMBOL_GPL(rtsx_pci_transfer_data);
 477
 478 int rtsx_pci_dma_map_sg(struct rtsx_pcr *pcr, struct scatterlist *sglist,
 479                 int num_sg, bool read)
 480 {
 481         enum dma_data_direction dir = read ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
 482
 483         if (pcr->remove_pci)
 484                 return -EINVAL;
 485
 486         if ((sglist == NULL) || (num_sg <= 0))
 487                 return -EINVAL;
 488
 489         return dma_map_sg(&(pcr->pci->dev), sglist, num_sg, dir);
 490 }
 491 EXPORT_SYMBOL_GPL(rtsx_pci_dma_map_sg);
 492
 493 void rtsx_pci_dma_unmap_sg(struct rtsx_pcr *pcr, struct scatterlist *sglist,
 494                 int num_sg, bool read)
 495 {
 496         enum dma_data_direction dir = read ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
 497
 498         dma_unmap_sg(&(pcr->pci->dev), sglist, num_sg, dir);
 499 }
 500 EXPORT_SYMBOL_GPL(rtsx_pci_dma_unmap_sg);
 501
 502 int rtsx_pci_dma_transfer(struct rtsx_pcr *pcr, struct scatterlist *sglist,
 503                 int count, bool read, int timeout)
 504 {
 505         struct completion trans_done;
 506         struct scatterlist *sg;
 507         dma_addr_t addr;
 508         long timeleft;
 509         unsigned long flags;
 510         unsigned int len;
 511         int i, err = 0;
 512         u32 val;
 513         u8 dir = read ? DEVICE_TO_HOST : HOST_TO_DEVICE;
 514
 515         if (pcr->remove_pci)
 516                 return -ENODEV;
 517
 518         if ((sglist == NULL) || (count < 1))
 519                 return -EINVAL;
 520
 521         val = ((u32)(dir & 0x01) << 29) | TRIG_DMA | ADMA_MODE;
 522         pcr->sgi = 0;
 523         for_each_sg(sglist, sg, count, i) {
 524                 addr = sg_dma_address(sg);
 525                 len = sg_dma_len(sg);
 526                 rtsx_pci_add_sg_tbl(pcr, addr, len, i == count - 1);
 527         }
 528
 529         spin_lock_irqsave(&pcr->lock, flags);
 530
 531         pcr->done = &trans_done;
 532         pcr->trans_result = TRANS_NOT_READY;
 533         init_completion(&trans_done);
 534         rtsx_pci_writel(pcr, RTSX_HDBAR, pcr->host_sg_tbl_addr);
 535         rtsx_pci_writel(pcr, RTSX_HDBCTLR, val);
 536
 537         spin_unlock_irqrestore(&pcr->lock, flags);
 538
 539         timeleft = wait_for_completion_interruptible_timeout(
 540                         &trans_done, msecs_to_jiffies(timeout));
 541         if (timeleft <= 0) {
 542                 pcr_dbg(pcr, "Timeout (%s %d)\n", __func__, __LINE__);
 543                 err = -ETIMEDOUT;
 544                 goto out;
 545         }
 546
 547         spin_lock_irqsave(&pcr->lock, flags);
 548         if (pcr->trans_result == TRANS_RESULT_FAIL) {
 549                 err = -EILSEQ;
 550                 if (pcr->dma_error_count < RTS_MAX_TIMES_FREQ_REDUCTION)
 551                         pcr->dma_error_count++;
 552         }
 553
 554         else if (pcr->trans_result == TRANS_NO_DEVICE)
 555                 err = -ENODEV;
 556         spin_unlock_irqrestore(&pcr->lock, flags);
 557
 558 out:
 559         spin_lock_irqsave(&pcr->lock, flags);
 560         pcr->done = NULL;
 561         spin_unlock_irqrestore(&pcr->lock, flags);
 562
 563         if ((err < 0) && (err != -ENODEV))
 564                 rtsx_pci_stop_cmd(pcr);
 565
 566         if (pcr->finish_me)
 567                 complete(pcr->finish_me);
 568
 569         return err;
 570 }
 571 EXPORT_SYMBOL_GPL(rtsx_pci_dma_transfer);
 572
 573 int rtsx_pci_read_ppbuf(struct rtsx_pcr *pcr, u8 *buf, int buf_len)
 574 {
 575         int err;
 576         int i, j;
 577         u16 reg;
 578         u8 *ptr;
 579
 580         if (buf_len > 512)
 581                 buf_len = 512;
 582
 583         ptr = buf;
 584         reg = PPBUF_BASE2;
 585         for (i = 0; i < buf_len / 256; i++) {
 586                 rtsx_pci_init_cmd(pcr);
 587
 588                 for (j = 0; j < 256; j++)
 589                         rtsx_pci_add_cmd(pcr, READ_REG_CMD, reg++, 0, 0);
 590
 591                 err = rtsx_pci_send_cmd(pcr, 250);
 592                 if (err < 0)
 593                         return err;
 594
 595                 memcpy(ptr, rtsx_pci_get_cmd_data(pcr), 256);
 596                 ptr += 256;
 597         }
 598
 599         if (buf_len % 256) {
 600                 rtsx_pci_init_cmd(pcr);
 601
 602                 for (j = 0; j < buf_len % 256; j++)
 603                         rtsx_pci_add_cmd(pcr, READ_REG_CMD, reg++, 0, 0);
 604
 605                 err = rtsx_pci_send_cmd(pcr, 250);
 606                 if (err < 0)
 607                         return err;
 608         }
 609
 610         memcpy(ptr, rtsx_pci_get_cmd_data(pcr), buf_len % 256);
 611
 612         return 0;
 613 }
 614 EXPORT_SYMBOL_GPL(rtsx_pci_read_ppbuf);
 615
 616 int rtsx_pci_write_ppbuf(struct rtsx_pcr *pcr, u8 *buf, int buf_len)
 617 {
 618         int err;
 619         int i, j;
 620         u16 reg;
 621         u8 *ptr;
 622
 623         if (buf_len > 512)
 624                 buf_len = 512;
 625
 626         ptr = buf;
 627         reg = PPBUF_BASE2;
 628         for (i = 0; i < buf_len / 256; i++) {
 629                 rtsx_pci_init_cmd(pcr);
 630
 631                 for (j = 0; j < 256; j++) {
 632                         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD,
 633                                         reg++, 0xFF, *ptr);
 634                         ptr++;
 635                 }
 636
 637                 err = rtsx_pci_send_cmd(pcr, 250);
 638                 if (err < 0)
 639                         return err;
 640         }
 641
 642         if (buf_len % 256) {
 643                 rtsx_pci_init_cmd(pcr);
 644
 645                 for (j = 0; j < buf_len % 256; j++) {
 646                         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD,
 647                                         reg++, 0xFF, *ptr);
 648                         ptr++;
 649                 }
 650
 651                 err = rtsx_pci_send_cmd(pcr, 250);
 652                 if (err < 0)
 653                         return err;
 654         }
 655
 656         return 0;
 657 }
 658 EXPORT_SYMBOL_GPL(rtsx_pci_write_ppbuf);
 659
 660 static int rtsx_pci_set_pull_ctl(struct rtsx_pcr *pcr, const u32 *tbl)
 661 {
 662         rtsx_pci_init_cmd(pcr);
 663
 664         while (*tbl & 0xFFFF0000) {
 665                 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD,
 666                                 (u16)(*tbl >> 16), 0xFF, (u8)(*tbl));
 667                 tbl++;
 668         }
 669
 670         return rtsx_pci_send_cmd(pcr, 100);
 671 }
 672
 673 int rtsx_pci_card_pull_ctl_enable(struct rtsx_pcr *pcr, int card)
 674 {
 675         const u32 *tbl;
 676
 677         if (card == RTSX_SD_CARD)
 678                 tbl = pcr->sd_pull_ctl_enable_tbl;
 679         else if (card == RTSX_MS_CARD)
 680                 tbl = pcr->ms_pull_ctl_enable_tbl;
 681         else
 682                 return -EINVAL;
 683
 684         return rtsx_pci_set_pull_ctl(pcr, tbl);
 685 }
 686 EXPORT_SYMBOL_GPL(rtsx_pci_card_pull_ctl_enable);
 687
 688 int rtsx_pci_card_pull_ctl_disable(struct rtsx_pcr *pcr, int card)
 689 {
 690         const u32 *tbl;
 691
 692         if (card == RTSX_SD_CARD)
 693                 tbl = pcr->sd_pull_ctl_disable_tbl;
 694         else if (card == RTSX_MS_CARD)
 695                 tbl = pcr->ms_pull_ctl_disable_tbl;
 696         else
 697                 return -EINVAL;
 698
 699
 700         return rtsx_pci_set_pull_ctl(pcr, tbl);
 701 }
 702 EXPORT_SYMBOL_GPL(rtsx_pci_card_pull_ctl_disable);
 703
 704 static void rtsx_pci_enable_bus_int(struct rtsx_pcr *pcr)
 705 {
 706         struct rtsx_hw_param *hw_param = &pcr->hw_param;
 707
 708         pcr->bier = TRANS_OK_INT_EN | TRANS_FAIL_INT_EN | SD_INT_EN
 709                 | hw_param->interrupt_en;
 710
 711         if (pcr->num_slots > 1)
 712                 pcr->bier |= MS_INT_EN;
 713
 714         /* Enable Bus Interrupt */
 715         rtsx_pci_writel(pcr, RTSX_BIER, pcr->bier);
 716
 717         pcr_dbg(pcr, "RTSX_BIER: 0x%08x\n", pcr->bier);
 718 }
 719
 720 static inline u8 double_ssc_depth(u8 depth)
 721 {
 722         return ((depth > 1) ? (depth - 1) : depth);
 723 }
 724
 725 static u8 revise_ssc_depth(u8 ssc_depth, u8 div)
 726 {
 727         if (div > CLK_DIV_1) {
 728                 if (ssc_depth > (div - 1))
 729                         ssc_depth -= (div - 1);
 730                 else
 731                         ssc_depth = SSC_DEPTH_4M;
 732         }
 733
 734         return ssc_depth;
 735 }
 736
 737 int rtsx_pci_switch_clock(struct rtsx_pcr *pcr, unsigned int card_clock,
 738                 u8 ssc_depth, bool initial_mode, bool double_clk, bool vpclk)
 739 {
 740         int err, clk;
 741         u8 n, clk_divider, mcu_cnt, div;
 742         static const u8 depth[] = {
 743                 [RTSX_SSC_DEPTH_4M] = SSC_DEPTH_4M,
 744                 [RTSX_SSC_DEPTH_2M] = SSC_DEPTH_2M,
 745                 [RTSX_SSC_DEPTH_1M] = SSC_DEPTH_1M,
 746                 [RTSX_SSC_DEPTH_500K] = SSC_DEPTH_500K,
 747                 [RTSX_SSC_DEPTH_250K] = SSC_DEPTH_250K,
 748         };
 749
 750         if (initial_mode) {
 751                 /* We use 250k(around) here, in initial stage */
 752                 clk_divider = SD_CLK_DIVIDE_128;
 753                 card_clock = 30000000;
 754         } else {
 755                 clk_divider = SD_CLK_DIVIDE_0;
 756         }
 757         err = rtsx_pci_write_register(pcr, SD_CFG1,
 758                         SD_CLK_DIVIDE_MASK, clk_divider);
 759         if (err < 0)
 760                 return err;
 761
 762         /* Reduce card clock by 20MHz each time a DMA transfer error occurs */
 763         if (card_clock == UHS_SDR104_MAX_DTR &&
 764             pcr->dma_error_count &&
 765             PCI_PID(pcr) == RTS5227_DEVICE_ID)
 766                 card_clock = UHS_SDR104_MAX_DTR -
 767                         (pcr->dma_error_count * 20000000);
 768
 769         card_clock /= 1000000;
 770         pcr_dbg(pcr, "Switch card clock to %dMHz\n", card_clock);
 771
 772         clk = card_clock;
 773         if (!initial_mode && double_clk)
 774                 clk = card_clock * 2;
 775         pcr_dbg(pcr, "Internal SSC clock: %dMHz (cur_clock = %d)\n",
 776                 clk, pcr->cur_clock);
 777
 778         if (clk == pcr->cur_clock)
 779                 return 0;
 780
 781         if (pcr->ops->conv_clk_and_div_n)
 782                 n = (u8)pcr->ops->conv_clk_and_div_n(clk, CLK_TO_DIV_N);
 783         else
 784                 n = (u8)(clk - 2);
 785         if ((clk <= 2) || (n > MAX_DIV_N_PCR))
 786                 return -EINVAL;
 787
 788         mcu_cnt = (u8)(125/clk + 3);
 789         if (mcu_cnt > 15)
 790                 mcu_cnt = 15;
 791
 792         /* Make sure that the SSC clock div_n is not less than MIN_DIV_N_PCR */
 793         div = CLK_DIV_1;
 794         while ((n < MIN_DIV_N_PCR) && (div < CLK_DIV_8)) {
 795                 if (pcr->ops->conv_clk_and_div_n) {
 796                         int dbl_clk = pcr->ops->conv_clk_and_div_n(n,
 797                                         DIV_N_TO_CLK) * 2;
 798                         n = (u8)pcr->ops->conv_clk_and_div_n(dbl_clk,
 799                                         CLK_TO_DIV_N);
 800                 } else {
 801                         n = (n + 2) * 2 - 2;
 802                 }
 803                 div++;
 804         }
 805         pcr_dbg(pcr, "n = %d, div = %d\n", n, div);
 806
 807         ssc_depth = depth[ssc_depth];
 808         if (double_clk)
 809                 ssc_depth = double_ssc_depth(ssc_depth);
 810
 811         ssc_depth = revise_ssc_depth(ssc_depth, div);
 812         pcr_dbg(pcr, "ssc_depth = %d\n", ssc_depth);
 813
 814         rtsx_pci_init_cmd(pcr);
 815         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CLK_CTL,
 816                         CLK_LOW_FREQ, CLK_LOW_FREQ);
 817         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CLK_DIV,
 818                         0xFF, (div << 4) | mcu_cnt);
 819         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SSC_CTL1, SSC_RSTB, 0);
 820         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SSC_CTL2,
 821                         SSC_DEPTH_MASK, ssc_depth);
 822         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SSC_DIV_N_0, 0xFF, n);
 823         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SSC_CTL1, SSC_RSTB, SSC_RSTB);
 824         if (vpclk) {
 825                 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_VPCLK0_CTL,
 826                                 PHASE_NOT_RESET, 0);
 827                 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_VPCLK0_CTL,
 828                                 PHASE_NOT_RESET, PHASE_NOT_RESET);
 829         }
 830
 831         err = rtsx_pci_send_cmd(pcr, 2000);
 832         if (err < 0)
 833                 return err;
 834
 835         /* Wait SSC clock stable */
 836         udelay(SSC_CLOCK_STABLE_WAIT);
 837         err = rtsx_pci_write_register(pcr, CLK_CTL, CLK_LOW_FREQ, 0);
 838         if (err < 0)
 839                 return err;
 840
 841         pcr->cur_clock = clk;
 842         return 0;
 843 }
 844 EXPORT_SYMBOL_GPL(rtsx_pci_switch_clock);
 845
 846 int rtsx_pci_card_power_on(struct rtsx_pcr *pcr, int card)
 847 {
 848         if (pcr->ops->card_power_on)
 849                 return pcr->ops->card_power_on(pcr, card);
 850
 851         return 0;
 852 }
 853 EXPORT_SYMBOL_GPL(rtsx_pci_card_power_on);
 854
 855 int rtsx_pci_card_power_off(struct rtsx_pcr *pcr, int card)
 856 {
 857         if (pcr->ops->card_power_off)
 858                 return pcr->ops->card_power_off(pcr, card);
 859
 860         return 0;
 861 }
 862 EXPORT_SYMBOL_GPL(rtsx_pci_card_power_off);
 863
 864 int rtsx_pci_card_exclusive_check(struct rtsx_pcr *pcr, int card)
 865 {
 866         static const unsigned int cd_mask[] = {
 867                 [RTSX_SD_CARD] = SD_EXIST,
 868                 [RTSX_MS_CARD] = MS_EXIST
 869         };
 870
 871         if (!(pcr->flags & PCR_MS_PMOS)) {
 872                 /* When using single PMOS, accessing card is not permitted
 873                  * if the existing card is not the designated one.
 874                  */
 875                 if (pcr->card_exist & (~cd_mask[card]))
 876                         return -EIO;
 877         }
 878
 879         return 0;
 880 }
 881 EXPORT_SYMBOL_GPL(rtsx_pci_card_exclusive_check);
 882
 883 int rtsx_pci_switch_output_voltage(struct rtsx_pcr *pcr, u8 voltage)
 884 {
 885         if (pcr->ops->switch_output_voltage)
 886                 return pcr->ops->switch_output_voltage(pcr, voltage);
 887
 888         return 0;
 889 }
 890 EXPORT_SYMBOL_GPL(rtsx_pci_switch_output_voltage);
 891
 892 unsigned int rtsx_pci_card_exist(struct rtsx_pcr *pcr)
 893 {
 894         unsigned int val;
 895
 896         val = rtsx_pci_readl(pcr, RTSX_BIPR);
 897         if (pcr->ops->cd_deglitch)
 898                 val = pcr->ops->cd_deglitch(pcr);
 899
 900         return val;
 901 }
 902 EXPORT_SYMBOL_GPL(rtsx_pci_card_exist);
 903
 904 void rtsx_pci_complete_unfinished_transfer(struct rtsx_pcr *pcr)
 905 {
 906         struct completion finish;
 907
 908         pcr->finish_me = &finish;
 909         init_completion(&finish);
 910
 911         if (pcr->done)
 912                 complete(pcr->done);
 913
 914         if (!pcr->remove_pci)
 915                 rtsx_pci_stop_cmd(pcr);
 916
 917         wait_for_completion_interruptible_timeout(&finish,
 918                         msecs_to_jiffies(2));
 919         pcr->finish_me = NULL;
 920 }
 921 EXPORT_SYMBOL_GPL(rtsx_pci_complete_unfinished_transfer);
 922
 923 static void rtsx_pci_card_detect(struct work_struct *work)
 924 {
 925         struct delayed_work *dwork;
 926         struct rtsx_pcr *pcr;
 927         unsigned long flags;
 928         unsigned int card_detect = 0, card_inserted, card_removed;
 929         u32 irq_status;
 930
 931         dwork = to_delayed_work(work);
 932         pcr = container_of(dwork, struct rtsx_pcr, carddet_work);
 933
 934         pcr_dbg(pcr, "--> %s\n", __func__);
 935
 936         mutex_lock(&pcr->pcr_mutex);
 937         spin_lock_irqsave(&pcr->lock, flags);
 938
 939         irq_status = rtsx_pci_readl(pcr, RTSX_BIPR);
 940         pcr_dbg(pcr, "irq_status: 0x%08x\n", irq_status);
 941
 942         irq_status &= CARD_EXIST;
 943         card_inserted = pcr->card_inserted & irq_status;
 944         card_removed = pcr->card_removed;
 945         pcr->card_inserted = 0;
 946         pcr->card_removed = 0;
 947
 948         spin_unlock_irqrestore(&pcr->lock, flags);
 949
 950         if (card_inserted || card_removed) {
 951                 pcr_dbg(pcr, "card_inserted: 0x%x, card_removed: 0x%x\n",
 952                         card_inserted, card_removed);
 953
 954                 if (pcr->ops->cd_deglitch)
 955                         card_inserted = pcr->ops->cd_deglitch(pcr);
 956
 957                 card_detect = card_inserted | card_removed;
 958
 959                 pcr->card_exist |= card_inserted;
 960                 pcr->card_exist &= ~card_removed;
 961         }
 962
 963         mutex_unlock(&pcr->pcr_mutex);
 964
 965         if ((card_detect & SD_EXIST) && pcr->slots[RTSX_SD_CARD].card_event)
 966                 pcr->slots[RTSX_SD_CARD].card_event(
 967                                 pcr->slots[RTSX_SD_CARD].p_dev);
 968         if ((card_detect & MS_EXIST) && pcr->slots[RTSX_MS_CARD].card_event)
 969                 pcr->slots[RTSX_MS_CARD].card_event(
 970                                 pcr->slots[RTSX_MS_CARD].p_dev);
 971 }
 972
 973 static void rtsx_pci_process_ocp(struct rtsx_pcr *pcr)
 974 {
 975         if (pcr->ops->process_ocp) {
 976                 pcr->ops->process_ocp(pcr);
 977         } else {
 978                 if (!pcr->option.ocp_en)
 979                         return;
 980                 rtsx_pci_get_ocpstat(pcr, &pcr->ocp_stat);
 981                 if (pcr->ocp_stat & (SD_OC_NOW | SD_OC_EVER)) {
 982                         rtsx_pci_card_power_off(pcr, RTSX_SD_CARD);
 983                         rtsx_pci_write_register(pcr, CARD_OE, SD_OUTPUT_EN, 0);
 984                         rtsx_pci_clear_ocpstat(pcr);
 985                         pcr->ocp_stat = 0;
 986                 }
 987         }
 988 }
 989
 990 static int rtsx_pci_process_ocp_interrupt(struct rtsx_pcr *pcr)
 991 {
 992         if (pcr->option.ocp_en)
 993                 rtsx_pci_process_ocp(pcr);
 994
 995         return 0;
 996 }
 997
 998 static irqreturn_t rtsx_pci_isr(int irq, void *dev_id)
 999 {
1000         struct rtsx_pcr *pcr = dev_id;
1001         u32 int_reg;
1002
1003         if (!pcr)
1004                 return IRQ_NONE;
1005
1006         spin_lock(&pcr->lock);
1007
1008         int_reg = rtsx_pci_readl(pcr, RTSX_BIPR);
1009         /* Clear interrupt flag */
1010         rtsx_pci_writel(pcr, RTSX_BIPR, int_reg);
1011         if ((int_reg & pcr->bier) == 0) {
1012                 spin_unlock(&pcr->lock);
1013                 return IRQ_NONE;
1014         }
1015         if (int_reg == 0xFFFFFFFF) {
1016                 spin_unlock(&pcr->lock);
1017                 return IRQ_HANDLED;
1018         }
1019
1020         int_reg &= (pcr->bier | 0x7FFFFF);
1021
1022         if (int_reg & SD_OC_INT)
1023                 rtsx_pci_process_ocp_interrupt(pcr);
1024
1025         if (int_reg & SD_INT) {
1026                 if (int_reg & SD_EXIST) {
1027                         pcr->card_inserted |= SD_EXIST;
1028                 } else {
1029                         pcr->card_removed |= SD_EXIST;
1030                         pcr->card_inserted &= ~SD_EXIST;
1031                 }
1032                 pcr->dma_error_count = 0;
1033         }
1034
1035         if (int_reg & MS_INT) {
1036                 if (int_reg & MS_EXIST) {
1037                         pcr->card_inserted |= MS_EXIST;
1038                 } else {
1039                         pcr->card_removed |= MS_EXIST;
1040                         pcr->card_inserted &= ~MS_EXIST;
1041                 }
1042         }
1043
1044         if (int_reg & (NEED_COMPLETE_INT | DELINK_INT)) {
1045                 if (int_reg & (TRANS_FAIL_INT | DELINK_INT)) {
1046                         pcr->trans_result = TRANS_RESULT_FAIL;
1047                         if (pcr->done)
1048                                 complete(pcr->done);
1049                 } else if (int_reg & TRANS_OK_INT) {
1050                         pcr->trans_result = TRANS_RESULT_OK;
1051                         if (pcr->done)
1052                                 complete(pcr->done);
1053                 }
1054         }
1055
1056         if ((pcr->card_inserted || pcr->card_removed) && !(int_reg & SD_OC_INT))
1057                 schedule_delayed_work(&pcr->carddet_work,
1058                                 msecs_to_jiffies(200));
1059
1060         spin_unlock(&pcr->lock);
1061         return IRQ_HANDLED;
1062 }
1063
1064 static int rtsx_pci_acquire_irq(struct rtsx_pcr *pcr)
1065 {
1066         pcr_dbg(pcr, "%s: pcr->msi_en = %d, pci->irq = %d\n",
1067                         __func__, pcr->msi_en, pcr->pci->irq);
1068
1069         if (request_irq(pcr->pci->irq, rtsx_pci_isr,
1070                         pcr->msi_en ? 0 : IRQF_SHARED,
1071                         DRV_NAME_RTSX_PCI, pcr)) {
1072                 dev_err(&(pcr->pci->dev),
1073                         "rtsx_sdmmc: unable to grab IRQ %d, disabling device\n",
1074                         pcr->pci->irq);
1075                 return -1;
1076         }
1077
1078         pcr->irq = pcr->pci->irq;
1079         pci_intx(pcr->pci, !pcr->msi_en);
1080
1081         return 0;
1082 }
1083
1084 static void rtsx_enable_aspm(struct rtsx_pcr *pcr)
1085 {
1086         if (pcr->ops->set_aspm)
1087                 pcr->ops->set_aspm(pcr, true);
1088         else
1089                 rtsx_comm_set_aspm(pcr, true);
1090 }
1091
1092 static void rtsx_comm_pm_power_saving(struct rtsx_pcr *pcr)
1093 {
1094         struct rtsx_cr_option *option = &pcr->option;
1095
1096         if (option->ltr_enabled) {
1097                 u32 latency = option->ltr_l1off_latency;
1098
1099                 if (rtsx_check_dev_flag(pcr, L1_SNOOZE_TEST_EN))
1100                         mdelay(option->l1_snooze_delay);
1101
1102                 rtsx_set_ltr_latency(pcr, latency);
1103         }
1104
1105         if (rtsx_check_dev_flag(pcr, LTR_L1SS_PWR_GATE_EN))
1106                 rtsx_set_l1off_sub_cfg_d0(pcr, 0);
1107
1108         rtsx_enable_aspm(pcr);
1109 }
1110
1111 static void rtsx_pm_power_saving(struct rtsx_pcr *pcr)
1112 {
1113         if (pcr->ops->power_saving)
1114                 pcr->ops->power_saving(pcr);
1115         else
1116                 rtsx_comm_pm_power_saving(pcr);
1117 }
1118
1119 static void rtsx_pci_idle_work(struct work_struct *work)
1120 {
1121         struct delayed_work *dwork = to_delayed_work(work);
1122         struct rtsx_pcr *pcr = container_of(dwork, struct rtsx_pcr, idle_work);
1123
1124         pcr_dbg(pcr, "--> %s\n", __func__);
1125
1126         mutex_lock(&pcr->pcr_mutex);
1127
1128         pcr->state = PDEV_STAT_IDLE;
1129
1130         if (pcr->ops->disable_auto_blink)
1131                 pcr->ops->disable_auto_blink(pcr);
1132         if (pcr->ops->turn_off_led)
1133                 pcr->ops->turn_off_led(pcr);
1134
1135         rtsx_pm_power_saving(pcr);
1136
1137         mutex_unlock(&pcr->pcr_mutex);
1138 }
1139
1140 #ifdef CONFIG_PM
1141 static void rtsx_pci_power_off(struct rtsx_pcr *pcr, u8 pm_state)
1142 {
1143         if (pcr->ops->turn_off_led)
1144                 pcr->ops->turn_off_led(pcr);
1145
1146         rtsx_pci_writel(pcr, RTSX_BIER, 0);
1147         pcr->bier = 0;
1148
1149         rtsx_pci_write_register(pcr, PETXCFG, 0x08, 0x08);
1150         rtsx_pci_write_register(pcr, HOST_SLEEP_STATE, 0x03, pm_state);
1151
1152         if (pcr->ops->force_power_down)
1153                 pcr->ops->force_power_down(pcr, pm_state);
1154 }
1155 #endif
1156
1157 void rtsx_pci_enable_ocp(struct rtsx_pcr *pcr)
1158 {
1159         u8 val = SD_OCP_INT_EN | SD_DETECT_EN;
1160
1161         if (pcr->ops->enable_ocp) {
1162                 pcr->ops->enable_ocp(pcr);
1163         } else {
1164                 rtsx_pci_write_register(pcr, FPDCTL, OC_POWER_DOWN, 0);
1165                 rtsx_pci_write_register(pcr, REG_OCPCTL, 0xFF, val);
1166         }
1167
1168 }
1169
1170 void rtsx_pci_disable_ocp(struct rtsx_pcr *pcr)
1171 {
1172         u8 mask = SD_OCP_INT_EN | SD_DETECT_EN;
1173
1174         if (pcr->ops->disable_ocp) {
1175                 pcr->ops->disable_ocp(pcr);
1176         } else {
1177                 rtsx_pci_write_register(pcr, REG_OCPCTL, mask, 0);
1178                 rtsx_pci_write_register(pcr, FPDCTL, OC_POWER_DOWN,
1179                                 OC_POWER_DOWN);
1180         }
1181 }
1182
1183 void rtsx_pci_init_ocp(struct rtsx_pcr *pcr)
1184 {
1185         if (pcr->ops->init_ocp) {
1186                 pcr->ops->init_ocp(pcr);
1187         } else {
1188                 struct rtsx_cr_option *option = &(pcr->option);
1189
1190                 if (option->ocp_en) {
1191                         u8 val = option->sd_800mA_ocp_thd;
1192
1193                         rtsx_pci_write_register(pcr, FPDCTL, OC_POWER_DOWN, 0);
1194                         rtsx_pci_write_register(pcr, REG_OCPPARA1,
1195                                 SD_OCP_TIME_MASK, SD_OCP_TIME_800);
1196                         rtsx_pci_write_register(pcr, REG_OCPPARA2,
1197                                 SD_OCP_THD_MASK, val);
1198                         rtsx_pci_write_register(pcr, REG_OCPGLITCH,
1199                                 SD_OCP_GLITCH_MASK, pcr->hw_param.ocp_glitch);
1200                         rtsx_pci_enable_ocp(pcr);
1201                 } else {
1202                         /* OC power down */
1203                         rtsx_pci_write_register(pcr, FPDCTL, OC_POWER_DOWN,
1204                                 OC_POWER_DOWN);
1205                 }
1206         }
1207 }
1208
1209 int rtsx_pci_get_ocpstat(struct rtsx_pcr *pcr, u8 *val)
1210 {
1211         if (pcr->ops->get_ocpstat)
1212                 return pcr->ops->get_ocpstat(pcr, val);
1213         else
1214                 return rtsx_pci_read_register(pcr, REG_OCPSTAT, val);
1215 }
1216
1217 void rtsx_pci_clear_ocpstat(struct rtsx_pcr *pcr)
1218 {
1219         if (pcr->ops->clear_ocpstat) {
1220                 pcr->ops->clear_ocpstat(pcr);
1221         } else {
1222                 u8 mask = SD_OCP_INT_CLR | SD_OC_CLR;
1223                 u8 val = SD_OCP_INT_CLR | SD_OC_CLR;
1224
1225                 rtsx_pci_write_register(pcr, REG_OCPCTL, mask, val);
1226                 udelay(100);
1227                 rtsx_pci_write_register(pcr, REG_OCPCTL, mask, 0);
1228         }
1229 }
1230
1231 int rtsx_sd_power_off_card3v3(struct rtsx_pcr *pcr)
1232 {
1233         rtsx_pci_write_register(pcr, CARD_CLK_EN, SD_CLK_EN |
1234                 MS_CLK_EN | SD40_CLK_EN, 0);
1235         rtsx_pci_write_register(pcr, CARD_OE, SD_OUTPUT_EN, 0);
1236         rtsx_pci_card_power_off(pcr, RTSX_SD_CARD);
1237
1238         msleep(50);
1239
1240         rtsx_pci_card_pull_ctl_disable(pcr, RTSX_SD_CARD);
1241
1242         return 0;
1243 }
1244
1245 int rtsx_ms_power_off_card3v3(struct rtsx_pcr *pcr)
1246 {
1247         rtsx_pci_write_register(pcr, CARD_CLK_EN, SD_CLK_EN |
1248                 MS_CLK_EN | SD40_CLK_EN, 0);
1249
1250         rtsx_pci_card_pull_ctl_disable(pcr, RTSX_MS_CARD);
1251
1252         rtsx_pci_write_register(pcr, CARD_OE, MS_OUTPUT_EN, 0);
1253         rtsx_pci_card_power_off(pcr, RTSX_MS_CARD);
1254
1255         return 0;
1256 }
1257
1258 static int rtsx_pci_init_hw(struct rtsx_pcr *pcr)
1259 {
1260         int err;
1261
1262         pcr->pcie_cap = pci_find_capability(pcr->pci, PCI_CAP_ID_EXP);
1263         rtsx_pci_writel(pcr, RTSX_HCBAR, pcr->host_cmds_addr);
1264
1265         rtsx_pci_enable_bus_int(pcr);
1266
1267         /* Power on SSC */
1268         err = rtsx_pci_write_register(pcr, FPDCTL, SSC_POWER_DOWN, 0);
1269         if (err < 0)
1270                 return err;
1271
1272         /* Wait SSC power stable */
1273         udelay(200);
1274
1275         rtsx_pci_disable_aspm(pcr);
1276         if (pcr->ops->optimize_phy) {
1277                 err = pcr->ops->optimize_phy(pcr);
1278                 if (err < 0)
1279                         return err;
1280         }
1281
1282         rtsx_pci_init_cmd(pcr);
1283
1284         /* Set mcu_cnt to 7 to ensure data can be sampled properly */
1285         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CLK_DIV, 0x07, 0x07);
1286
1287         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, HOST_SLEEP_STATE, 0x03, 0x00);
1288         /* Disable card clock */
1289         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_CLK_EN, 0x1E, 0);
1290         /* Reset delink mode */
1291         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CHANGE_LINK_STATE, 0x0A, 0);
1292         /* Card driving select */
1293         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_DRIVE_SEL,
1294                         0xFF, pcr->card_drive_sel);
1295         /* Enable SSC Clock */
1296         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SSC_CTL1,
1297                         0xFF, SSC_8X_EN | SSC_SEL_4M);
1298         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SSC_CTL2, 0xFF, 0x12);
1299         /* Disable cd_pwr_save */
1300         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CHANGE_LINK_STATE, 0x16, 0x10);
1301         /* Clear Link Ready Interrupt */
1302         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, IRQSTAT0,
1303                         LINK_RDY_INT, LINK_RDY_INT);
1304         /* Enlarge the estimation window of PERST# glitch
1305          * to reduce the chance of invalid card interrupt
1306          */
1307         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PERST_GLITCH_WIDTH, 0xFF, 0x80);
1308         /* Update RC oscillator to 400k
1309          * bit[0] F_HIGH: for RC oscillator, Rst_value is 1'b1
1310          *                1: 2M  0: 400k
1311          */
1312         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, RCCTL, 0x01, 0x00);
1313         /* Set interrupt write clear
1314          * bit 1: U_elbi_if_rd_clr_en
1315          *      1: Enable ELBI interrupt[31:22] & [7:0] flag read clear
1316          *      0: ELBI interrupt flag[31:22] & [7:0] only can be write clear
1317          */
1318         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, NFTS_TX_CTRL, 0x02, 0);
1319
1320         err = rtsx_pci_send_cmd(pcr, 100);
1321         if (err < 0)
1322                 return err;
1323
1324         switch (PCI_PID(pcr)) {
1325         case PID_5250:
1326         case PID_524A:
1327         case PID_525A:
1328         case PID_5260:
1329                 rtsx_pci_write_register(pcr, PM_CLK_FORCE_CTL, 1, 1);
1330                 break;
1331         default:
1332                 break;
1333         }
1334
1335         /*init ocp*/
1336         rtsx_pci_init_ocp(pcr);
1337
1338         /* Enable clk_request_n to enable clock power management */
1339         rtsx_pci_write_config_byte(pcr, pcr->pcie_cap + PCI_EXP_LNKCTL + 1, 1);
1340         /* Enter L1 when host tx idle */
1341         rtsx_pci_write_config_byte(pcr, 0x70F, 0x5B);
1342
1343         if (pcr->ops->extra_init_hw) {
1344                 err = pcr->ops->extra_init_hw(pcr);
1345                 if (err < 0)
1346                         return err;
1347         }
1348
1349         /* No CD interrupt if probing driver with card inserted.
1350          * So we need to initialize pcr->card_exist here.
1351          */
1352         if (pcr->ops->cd_deglitch)
1353                 pcr->card_exist = pcr->ops->cd_deglitch(pcr);
1354         else
1355                 pcr->card_exist = rtsx_pci_readl(pcr, RTSX_BIPR) & CARD_EXIST;
1356
1357         return 0;
1358 }
1359
1360 static int rtsx_pci_init_chip(struct rtsx_pcr *pcr)
1361 {
1362         int err;
1363
1364         spin_lock_init(&pcr->lock);
1365         mutex_init(&pcr->pcr_mutex);
1366
1367         switch (PCI_PID(pcr)) {
1368         default:
1369         case 0x5209:
1370                 rts5209_init_params(pcr);
1371                 break;
1372
1373         case 0x5229:
1374                 rts5229_init_params(pcr);
1375                 break;
1376
1377         case 0x5289:
1378                 rtl8411_init_params(pcr);
1379                 break;
1380
1381         case 0x5227:
1382                 rts5227_init_params(pcr);
1383                 break;
1384
1385         case 0x522A:
1386                 rts522a_init_params(pcr);
1387                 break;
1388
1389         case 0x5249:
1390                 rts5249_init_params(pcr);
1391                 break;
1392
1393         case 0x524A:
1394                 rts524a_init_params(pcr);
1395                 break;
1396
1397         case 0x525A:
1398                 rts525a_init_params(pcr);
1399                 break;
1400
1401         case 0x5287:
1402                 rtl8411b_init_params(pcr);
1403                 break;
1404
1405         case 0x5286:
1406                 rtl8402_init_params(pcr);
1407                 break;
1408         case 0x5260:
1409                 rts5260_init_params(pcr);
1410                 break;
1411         }
1412
1413         pcr_dbg(pcr, "PID: 0x%04x, IC version: 0x%02x\n",
1414                         PCI_PID(pcr), pcr->ic_version);
1415
1416         pcr->slots = kcalloc(pcr->num_slots, sizeof(struct rtsx_slot),
1417                         GFP_KERNEL);
1418         if (!pcr->slots)
1419                 return -ENOMEM;
1420
1421         if (pcr->ops->fetch_vendor_settings)
1422                 pcr->ops->fetch_vendor_settings(pcr);
1423
1424         pcr_dbg(pcr, "pcr->aspm_en = 0x%x\n", pcr->aspm_en);
1425         pcr_dbg(pcr, "pcr->sd30_drive_sel_1v8 = 0x%x\n",
1426                         pcr->sd30_drive_sel_1v8);
1427         pcr_dbg(pcr, "pcr->sd30_drive_sel_3v3 = 0x%x\n",
1428                         pcr->sd30_drive_sel_3v3);
1429         pcr_dbg(pcr, "pcr->card_drive_sel = 0x%x\n",
1430                         pcr->card_drive_sel);
1431         pcr_dbg(pcr, "pcr->flags = 0x%x\n", pcr->flags);
1432
1433         pcr->state = PDEV_STAT_IDLE;
1434         err = rtsx_pci_init_hw(pcr);
1435         if (err < 0) {
1436                 kfree(pcr->slots);
1437                 return err;
1438         }
1439
1440         return 0;
1441 }
1442
1443 static int rtsx_pci_probe(struct pci_dev *pcidev,
1444                           const struct pci_device_id *id)
1445 {
1446         struct rtsx_pcr *pcr;
1447         struct pcr_handle *handle;
1448         u32 base, len;
1449         int ret, i, bar = 0;
1450
1451         dev_dbg(&(pcidev->dev),
1452                 ": Realtek PCI-E Card Reader found at %s [%04x:%04x] (rev %x)\n",
1453                 pci_name(pcidev), (int)pcidev->vendor, (int)pcidev->device,
1454                 (int)pcidev->revision);
1455
1456         ret = pci_set_dma_mask(pcidev, DMA_BIT_MASK(32));
1457         if (ret < 0)
1458                 return ret;
1459
1460         ret = pci_enable_device(pcidev);
1461         if (ret)
1462                 return ret;
1463
1464         ret = pci_request_regions(pcidev, DRV_NAME_RTSX_PCI);
1465         if (ret)
1466                 goto disable;
1467
1468         pcr = kzalloc(sizeof(*pcr), GFP_KERNEL);
1469         if (!pcr) {
1470                 ret = -ENOMEM;
1471                 goto release_pci;
1472         }
1473
1474         handle = kzalloc(sizeof(*handle), GFP_KERNEL);
1475         if (!handle) {
1476                 ret = -ENOMEM;
1477                 goto free_pcr;
1478         }
1479         handle->pcr = pcr;
1480
1481         idr_preload(GFP_KERNEL);
1482         spin_lock(&rtsx_pci_lock);
1483         ret = idr_alloc(&rtsx_pci_idr, pcr, 0, 0, GFP_NOWAIT);
1484         if (ret >= 0)
1485                 pcr->id = ret;
1486         spin_unlock(&rtsx_pci_lock);
1487         idr_preload_end();
1488         if (ret < 0)
1489                 goto free_handle;
1490
1491         pcr->pci = pcidev;
1492         dev_set_drvdata(&pcidev->dev, handle);
1493
1494         if (CHK_PCI_PID(pcr, 0x525A))
1495                 bar = 1;
1496         len = pci_resource_len(pcidev, bar);
1497         base = pci_resource_start(pcidev, bar);
1498         pcr->remap_addr = ioremap_nocache(base, len);
1499         if (!pcr->remap_addr) {
1500                 ret = -ENOMEM;
1501                 goto free_handle;
1502         }
1503
1504         pcr->rtsx_resv_buf = dma_alloc_coherent(&(pcidev->dev),
1505                         RTSX_RESV_BUF_LEN, &(pcr->rtsx_resv_buf_addr),
1506                         GFP_KERNEL);
1507         if (pcr->rtsx_resv_buf == NULL) {
1508                 ret = -ENXIO;
1509                 goto unmap;
1510         }
1511         pcr->host_cmds_ptr = pcr->rtsx_resv_buf;
1512         pcr->host_cmds_addr = pcr->rtsx_resv_buf_addr;
1513         pcr->host_sg_tbl_ptr = pcr->rtsx_resv_buf + HOST_CMDS_BUF_LEN;
1514         pcr->host_sg_tbl_addr = pcr->rtsx_resv_buf_addr + HOST_CMDS_BUF_LEN;
1515
1516         pcr->card_inserted = 0;
1517         pcr->card_removed = 0;
1518         INIT_DELAYED_WORK(&pcr->carddet_work, rtsx_pci_card_detect);
1519         INIT_DELAYED_WORK(&pcr->idle_work, rtsx_pci_idle_work);
1520
1521         pcr->msi_en = msi_en;
1522         if (pcr->msi_en) {
1523                 ret = pci_enable_msi(pcidev);
1524                 if (ret)
1525                         pcr->msi_en = false;
1526         }
1527
1528         ret = rtsx_pci_acquire_irq(pcr);
1529         if (ret < 0)
1530                 goto disable_msi;
1531
1532         pci_set_master(pcidev);
1533         synchronize_irq(pcr->irq);
1534
1535         ret = rtsx_pci_init_chip(pcr);
1536         if (ret < 0)
1537                 goto disable_irq;
1538
1539         for (i = 0; i < ARRAY_SIZE(rtsx_pcr_cells); i++) {
1540                 rtsx_pcr_cells[i].platform_data = handle;
1541                 rtsx_pcr_cells[i].pdata_size = sizeof(*handle);
1542         }
1543         ret = mfd_add_devices(&pcidev->dev, pcr->id, rtsx_pcr_cells,
1544                         ARRAY_SIZE(rtsx_pcr_cells), NULL, 0, NULL);
1545         if (ret < 0)
1546                 goto disable_irq;
1547
1548         schedule_delayed_work(&pcr->idle_work, msecs_to_jiffies(200));
1549
1550         return 0;
1551
1552 disable_irq:
1553         free_irq(pcr->irq, (void *)pcr);
1554 disable_msi:
1555         if (pcr->msi_en)
1556                 pci_disable_msi(pcr->pci);
1557         dma_free_coherent(&(pcr->pci->dev), RTSX_RESV_BUF_LEN,
1558                         pcr->rtsx_resv_buf, pcr->rtsx_resv_buf_addr);
1559 unmap:
1560         iounmap(pcr->remap_addr);
1561 free_handle:
1562         kfree(handle);
1563 free_pcr:
1564         kfree(pcr);
1565 release_pci:
1566         pci_release_regions(pcidev);
1567 disable:
1568         pci_disable_device(pcidev);
1569
1570         return ret;
1571 }
1572
1573 static void rtsx_pci_remove(struct pci_dev *pcidev)
1574 {
1575         struct pcr_handle *handle = pci_get_drvdata(pcidev);
1576         struct rtsx_pcr *pcr = handle->pcr;
1577
1578         pcr->remove_pci = true;
1579
1580         /* Disable interrupts at the pcr level */
1581         spin_lock_irq(&pcr->lock);
1582         rtsx_pci_writel(pcr, RTSX_BIER, 0);
1583         pcr->bier = 0;
1584         spin_unlock_irq(&pcr->lock);
1585
1586         cancel_delayed_work_sync(&pcr->carddet_work);
1587         cancel_delayed_work_sync(&pcr->idle_work);
1588
1589         mfd_remove_devices(&pcidev->dev);
1590
1591         dma_free_coherent(&(pcr->pci->dev), RTSX_RESV_BUF_LEN,
1592                         pcr->rtsx_resv_buf, pcr->rtsx_resv_buf_addr);
1593         free_irq(pcr->irq, (void *)pcr);
1594         if (pcr->msi_en)
1595                 pci_disable_msi(pcr->pci);
1596         iounmap(pcr->remap_addr);
1597
1598         pci_release_regions(pcidev);
1599         pci_disable_device(pcidev);
1600
1601         spin_lock(&rtsx_pci_lock);
1602         idr_remove(&rtsx_pci_idr, pcr->id);
1603         spin_unlock(&rtsx_pci_lock);
1604
1605         kfree(pcr->slots);
1606         kfree(pcr);
1607         kfree(handle);
1608
1609         dev_dbg(&(pcidev->dev),
1610                 ": Realtek PCI-E Card Reader at %s [%04x:%04x] has been removed\n",
1611                 pci_name(pcidev), (int)pcidev->vendor, (int)pcidev->device);
1612 }
1613
1614 #ifdef CONFIG_PM
1615
1616 static int rtsx_pci_suspend(struct pci_dev *pcidev, pm_message_t state)
1617 {
1618         struct pcr_handle *handle;
1619         struct rtsx_pcr *pcr;
1620
1621         dev_dbg(&(pcidev->dev), "--> %s\n", __func__);
1622
1623         handle = pci_get_drvdata(pcidev);
1624         pcr = handle->pcr;
1625
1626         cancel_delayed_work(&pcr->carddet_work);
1627         cancel_delayed_work(&pcr->idle_work);
1628
1629         mutex_lock(&pcr->pcr_mutex);
1630
1631         rtsx_pci_power_off(pcr, HOST_ENTER_S3);
1632
1633         pci_save_state(pcidev);
1634         pci_enable_wake(pcidev, pci_choose_state(pcidev, state), 0);
1635         pci_disable_device(pcidev);
1636         pci_set_power_state(pcidev, pci_choose_state(pcidev, state));
1637
1638         mutex_unlock(&pcr->pcr_mutex);
1639         return 0;
1640 }
1641
1642 static int rtsx_pci_resume(struct pci_dev *pcidev)
1643 {
1644         struct pcr_handle *handle;
1645         struct rtsx_pcr *pcr;
1646         int ret = 0;
1647
1648         dev_dbg(&(pcidev->dev), "--> %s\n", __func__);
1649
1650         handle = pci_get_drvdata(pcidev);
1651         pcr = handle->pcr;
1652
1653         mutex_lock(&pcr->pcr_mutex);
1654
1655         pci_set_power_state(pcidev, PCI_D0);
1656         pci_restore_state(pcidev);
1657         ret = pci_enable_device(pcidev);
1658         if (ret)
1659                 goto out;
1660         pci_set_master(pcidev);
1661
1662         ret = rtsx_pci_write_register(pcr, HOST_SLEEP_STATE, 0x03, 0x00);
1663         if (ret)
1664                 goto out;
1665
1666         ret = rtsx_pci_init_hw(pcr);
1667         if (ret)
1668                 goto out;
1669
1670         schedule_delayed_work(&pcr->idle_work, msecs_to_jiffies(200));
1671
1672 out:
1673         mutex_unlock(&pcr->pcr_mutex);
1674         return ret;
1675 }
1676
1677 static void rtsx_pci_shutdown(struct pci_dev *pcidev)
1678 {
1679         struct pcr_handle *handle;
1680         struct rtsx_pcr *pcr;
1681
1682         dev_dbg(&(pcidev->dev), "--> %s\n", __func__);
1683
1684         handle = pci_get_drvdata(pcidev);
1685         pcr = handle->pcr;
1686         rtsx_pci_power_off(pcr, HOST_ENTER_S1);
1687
1688         pci_disable_device(pcidev);
1689         free_irq(pcr->irq, (void *)pcr);
1690         if (pcr->msi_en)
1691                 pci_disable_msi(pcr->pci);
1692 }
1693
1694 #else /* CONFIG_PM */
1695
1696 #define rtsx_pci_suspend NULL
1697 #define rtsx_pci_resume NULL
1698 #define rtsx_pci_shutdown NULL
1699
1700 #endif /* CONFIG_PM */
1701
1702 static struct pci_driver rtsx_pci_driver = {
1703         .name = DRV_NAME_RTSX_PCI,
1704         .id_table = rtsx_pci_ids,
1705         .probe = rtsx_pci_probe,
1706         .remove = rtsx_pci_remove,
1707         .suspend = rtsx_pci_suspend,
1708         .resume = rtsx_pci_resume,
1709         .shutdown = rtsx_pci_shutdown,
1710 };
1711 module_pci_driver(rtsx_pci_driver);
1712
1713 MODULE_LICENSE("GPL");
1714 MODULE_AUTHOR("Wei WANG <[email protected]>");
1715 MODULE_DESCRIPTION("Realtek PCI-E Card Reader Driver");