drivers/ata/pata_samsung_cf.c

   1 /*
   2  * Copyright (c) 2010 Samsung Electronics Co., Ltd.
   3  *              http://www.samsung.com
   4  *
   5  * PATA driver for Samsung SoCs.
   6  * Supports CF Interface in True IDE mode. Currently only PIO mode has been
   7  * implemented; UDMA support has to be added.
   8  *
   9  * Based on:
  10  *      PATA driver for AT91SAM9260 Static Memory Controller
  11  *      PATA driver for Toshiba SCC controller
  12  *
  13  * This program is free software; you can redistribute it and/or modify it
  14  * under the terms of the GNU General Public License version 2
  15  * as published by the Free Software Foundation.
  16 */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/clk.h>
  22 #include <linux/libata.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/slab.h>
  25
  26 #include <linux/platform_data/ata-samsung_cf.h>
  27 #include <plat/regs-ata.h>
  28
  29 #define DRV_NAME "pata_samsung_cf"
  30 #define DRV_VERSION "0.1"
  31
  32 enum s3c_cpu_type {
  33         TYPE_S3C64XX,
  34         TYPE_S5PC100,
  35         TYPE_S5PV210,
  36 };
  37
  38 /*
  39  * struct s3c_ide_info - S3C PATA instance.
  40  * @clk: The clock resource for this controller.
  41  * @ide_addr: The area mapped for the hardware registers.
  42  * @sfr_addr: The area mapped for the special function registers.
  43  * @irq: The IRQ number we are using.
  44  * @cpu_type: The exact type of this controller.
  45  * @fifo_status_reg: The ATA_FIFO_STATUS register offset.
  46  */
  47 struct s3c_ide_info {
  48         struct clk *clk;
  49         void __iomem *ide_addr;
  50         void __iomem *sfr_addr;
  51         unsigned int irq;
  52         enum s3c_cpu_type cpu_type;
  53         unsigned int fifo_status_reg;
  54 };
  55
  56 static void pata_s3c_set_endian(void __iomem *s3c_ide_regbase, u8 mode)
  57 {
  58         u32 reg = readl(s3c_ide_regbase + S3C_ATA_CFG);
  59         reg = mode ? (reg & ~S3C_ATA_CFG_SWAP) : (reg | S3C_ATA_CFG_SWAP);
  60         writel(reg, s3c_ide_regbase + S3C_ATA_CFG);
  61 }
  62
  63 static void pata_s3c_cfg_mode(void __iomem *s3c_ide_sfrbase)
  64 {
  65         /* Select true-ide as the internal operating mode */
  66         writel(readl(s3c_ide_sfrbase + S3C_CFATA_MUX) | S3C_CFATA_MUX_TRUEIDE,
  67                 s3c_ide_sfrbase + S3C_CFATA_MUX);
  68 }
  69
  70 static unsigned long
  71 pata_s3c_setup_timing(struct s3c_ide_info *info, const struct ata_timing *ata)
  72 {
  73         int t1 = ata->setup;
  74         int t2 = ata->act8b;
  75         int t2i = ata->rec8b;
  76         ulong piotime;
  77
  78         piotime = ((t2i & 0xff) << 12) | ((t2 & 0xff) << 4) | (t1 & 0xf);
  79
  80         return piotime;
  81 }
  82
  83 static void pata_s3c_set_piomode(struct ata_port *ap, struct ata_device *adev)
  84 {
  85         struct s3c_ide_info *info = ap->host->private_data;
  86         struct ata_timing timing;
  87         int cycle_time;
  88         ulong ata_cfg = readl(info->ide_addr + S3C_ATA_CFG);
  89         ulong piotime;
  90
  91         /* Enables IORDY if mode requires it */
  92         if (ata_pio_need_iordy(adev))
  93                 ata_cfg |= S3C_ATA_CFG_IORDYEN;
  94         else
  95                 ata_cfg &= ~S3C_ATA_CFG_IORDYEN;
  96
  97         cycle_time = (int)(1000000000UL / clk_get_rate(info->clk));
  98
  99         ata_timing_compute(adev, adev->pio_mode, &timing,
 100                                         cycle_time * 1000, 0);
 101
 102         piotime = pata_s3c_setup_timing(info, &timing);
 103
 104         writel(ata_cfg, info->ide_addr + S3C_ATA_CFG);
 105         writel(piotime, info->ide_addr + S3C_ATA_PIO_TIME);
 106 }
 107
 108 /*
 109  * Waits until the IDE controller is able to perform next read/write
 110  * operation to the disk. Needed for 64XX series boards only.
 111  */
 112 static int wait_for_host_ready(struct s3c_ide_info *info)
 113 {
 114         ulong timeout;
 115         void __iomem *fifo_reg = info->ide_addr + info->fifo_status_reg;
 116
 117         /* wait for maximum of 20 msec */
 118         timeout = jiffies + msecs_to_jiffies(20);
 119         while (time_before(jiffies, timeout)) {
 120                 if ((readl(fifo_reg) >> 28) == 0)
 121                         return 0;
 122         }
 123         return -EBUSY;
 124 }
 125
 126 /*
 127  * Writes to one of the task file registers.
 128  */
 129 static void ata_outb(struct ata_host *host, u8 addr, void __iomem *reg)
 130 {
 131         struct s3c_ide_info *info = host->private_data;
 132
 133         wait_for_host_ready(info);
 134         writeb(addr, reg);
 135 }
 136
 137 /*
 138  * Reads from one of the task file registers.
 139  */
 140 static u8 ata_inb(struct ata_host *host, void __iomem *reg)
 141 {
 142         struct s3c_ide_info *info = host->private_data;
 143         u8 temp;
 144
 145         wait_for_host_ready(info);
 146         (void) readb(reg);
 147         wait_for_host_ready(info);
 148         temp = readb(info->ide_addr + S3C_ATA_PIO_RDATA);
 149         return temp;
 150 }
 151
 152 /*
 153  * pata_s3c_tf_load - send taskfile registers to host controller
 154  */
 155 static void pata_s3c_tf_load(struct ata_port *ap,
 156                                 const struct ata_taskfile *tf)
 157 {
 158         struct ata_ioports *ioaddr = &ap->ioaddr;
 159         unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
 160
 161         if (tf->ctl != ap->last_ctl) {
 162                 ata_outb(ap->host, tf->ctl, ioaddr->ctl_addr);
 163                 ap->last_ctl = tf->ctl;
 164                 ata_wait_idle(ap);
 165         }
 166
 167         if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
 168                 ata_outb(ap->host, tf->hob_feature, ioaddr->feature_addr);
 169                 ata_outb(ap->host, tf->hob_nsect, ioaddr->nsect_addr);
 170                 ata_outb(ap->host, tf->hob_lbal, ioaddr->lbal_addr);
 171                 ata_outb(ap->host, tf->hob_lbam, ioaddr->lbam_addr);
 172                 ata_outb(ap->host, tf->hob_lbah, ioaddr->lbah_addr);
 173         }
 174
 175         if (is_addr) {
 176                 ata_outb(ap->host, tf->feature, ioaddr->feature_addr);
 177                 ata_outb(ap->host, tf->nsect, ioaddr->nsect_addr);
 178                 ata_outb(ap->host, tf->lbal, ioaddr->lbal_addr);
 179                 ata_outb(ap->host, tf->lbam, ioaddr->lbam_addr);
 180                 ata_outb(ap->host, tf->lbah, ioaddr->lbah_addr);
 181         }
 182
 183         if (tf->flags & ATA_TFLAG_DEVICE)
 184                 ata_outb(ap->host, tf->device, ioaddr->device_addr);
 185
 186         ata_wait_idle(ap);
 187 }
 188
 189 /*
 190  * pata_s3c_tf_read - input device's ATA taskfile shadow registers
 191  */
 192 static void pata_s3c_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
 193 {
 194         struct ata_ioports *ioaddr = &ap->ioaddr;
 195
 196         tf->feature = ata_inb(ap->host, ioaddr->error_addr);
 197         tf->nsect = ata_inb(ap->host, ioaddr->nsect_addr);
 198         tf->lbal = ata_inb(ap->host, ioaddr->lbal_addr);
 199         tf->lbam = ata_inb(ap->host, ioaddr->lbam_addr);
 200         tf->lbah = ata_inb(ap->host, ioaddr->lbah_addr);
 201         tf->device = ata_inb(ap->host, ioaddr->device_addr);
 202
 203         if (tf->flags & ATA_TFLAG_LBA48) {
 204                 ata_outb(ap->host, tf->ctl | ATA_HOB, ioaddr->ctl_addr);
 205                 tf->hob_feature = ata_inb(ap->host, ioaddr->error_addr);
 206                 tf->hob_nsect = ata_inb(ap->host, ioaddr->nsect_addr);
 207                 tf->hob_lbal = ata_inb(ap->host, ioaddr->lbal_addr);
 208                 tf->hob_lbam = ata_inb(ap->host, ioaddr->lbam_addr);
 209                 tf->hob_lbah = ata_inb(ap->host, ioaddr->lbah_addr);
 210                 ata_outb(ap->host, tf->ctl, ioaddr->ctl_addr);
 211                 ap->last_ctl = tf->ctl;
 212         }
 213 }
 214
 215 /*
 216  * pata_s3c_exec_command - issue ATA command to host controller
 217  */
 218 static void pata_s3c_exec_command(struct ata_port *ap,
 219                                 const struct ata_taskfile *tf)
 220 {
 221         ata_outb(ap->host, tf->command, ap->ioaddr.command_addr);
 222         ata_sff_pause(ap);
 223 }
 224
 225 /*
 226  * pata_s3c_check_status - Read device status register
 227  */
 228 static u8 pata_s3c_check_status(struct ata_port *ap)
 229 {
 230         return ata_inb(ap->host, ap->ioaddr.status_addr);
 231 }
 232
 233 /*
 234  * pata_s3c_check_altstatus - Read alternate device status register
 235  */
 236 static u8 pata_s3c_check_altstatus(struct ata_port *ap)
 237 {
 238         return ata_inb(ap->host, ap->ioaddr.altstatus_addr);
 239 }
 240
 241 /*
 242  * pata_s3c_data_xfer - Transfer data by PIO
 243  */
 244 static unsigned int pata_s3c_data_xfer(struct ata_device *dev,
 245                                 unsigned char *buf, unsigned int buflen, int rw)
 246 {
 247         struct ata_port *ap = dev->link->ap;
 248         struct s3c_ide_info *info = ap->host->private_data;
 249         void __iomem *data_addr = ap->ioaddr.data_addr;
 250         unsigned int words = buflen >> 1, i;
 251         u16 *data_ptr = (u16 *)buf;
 252
 253         /* Requires wait same as in ata_inb/ata_outb */
 254         if (rw == READ)
 255                 for (i = 0; i < words; i++, data_ptr++) {
 256                         wait_for_host_ready(info);
 257                         (void) readw(data_addr);
 258                         wait_for_host_ready(info);
 259                         *data_ptr = readw(info->ide_addr
 260                                         + S3C_ATA_PIO_RDATA);
 261                 }
 262         else
 263                 for (i = 0; i < words; i++, data_ptr++) {
 264                         wait_for_host_ready(info);
 265                         writew(*data_ptr, data_addr);
 266                 }
 267
 268         if (buflen & 0x01)
 269                 dev_err(ap->dev, "unexpected trailing data\n");
 270
 271         return words << 1;
 272 }
 273
 274 /*
 275  * pata_s3c_dev_select - Select device on ATA bus
 276  */
 277 static void pata_s3c_dev_select(struct ata_port *ap, unsigned int device)
 278 {
 279         u8 tmp = ATA_DEVICE_OBS;
 280
 281         if (device != 0)
 282                 tmp |= ATA_DEV1;
 283
 284         ata_outb(ap->host, tmp, ap->ioaddr.device_addr);
 285         ata_sff_pause(ap);
 286 }
 287
 288 /*
 289  * pata_s3c_devchk - PATA device presence detection
 290  */
 291 static unsigned int pata_s3c_devchk(struct ata_port *ap,
 292                                 unsigned int device)
 293 {
 294         struct ata_ioports *ioaddr = &ap->ioaddr;
 295         u8 nsect, lbal;
 296
 297         pata_s3c_dev_select(ap, device);
 298
 299         ata_outb(ap->host, 0x55, ioaddr->nsect_addr);
 300         ata_outb(ap->host, 0xaa, ioaddr->lbal_addr);
 301
 302         ata_outb(ap->host, 0xaa, ioaddr->nsect_addr);
 303         ata_outb(ap->host, 0x55, ioaddr->lbal_addr);
 304
 305         ata_outb(ap->host, 0x55, ioaddr->nsect_addr);
 306         ata_outb(ap->host, 0xaa, ioaddr->lbal_addr);
 307
 308         nsect = ata_inb(ap->host, ioaddr->nsect_addr);
 309         lbal = ata_inb(ap->host, ioaddr->lbal_addr);
 310
 311         if ((nsect == 0x55) && (lbal == 0xaa))
 312                 return 1;       /* we found a device */
 313
 314         return 0;               /* nothing found */
 315 }
 316
 317 /*
 318  * pata_s3c_wait_after_reset - wait for devices to become ready after reset
 319  */
 320 static int pata_s3c_wait_after_reset(struct ata_link *link,
 321                 unsigned long deadline)
 322 {
 323         int rc;
 324
 325         ata_msleep(link->ap, ATA_WAIT_AFTER_RESET);
 326
 327         /* always check readiness of the master device */
 328         rc = ata_sff_wait_ready(link, deadline);
 329         /* -ENODEV means the odd clown forgot the D7 pulldown resistor
 330          * and TF status is 0xff, bail out on it too.
 331          */
 332         if (rc)
 333                 return rc;
 334
 335         return 0;
 336 }
 337
 338 /*
 339  * pata_s3c_bus_softreset - PATA device software reset
 340  */
 341 static unsigned int pata_s3c_bus_softreset(struct ata_port *ap,
 342                 unsigned long deadline)
 343 {
 344         struct ata_ioports *ioaddr = &ap->ioaddr;
 345
 346         /* software reset.  causes dev0 to be selected */
 347         ata_outb(ap->host, ap->ctl, ioaddr->ctl_addr);
 348         udelay(20);
 349         ata_outb(ap->host, ap->ctl | ATA_SRST, ioaddr->ctl_addr);
 350         udelay(20);
 351         ata_outb(ap->host, ap->ctl, ioaddr->ctl_addr);
 352         ap->last_ctl = ap->ctl;
 353
 354         return pata_s3c_wait_after_reset(&ap->link, deadline);
 355 }
 356
 357 /*
 358  * pata_s3c_softreset - reset host port via ATA SRST
 359  */
 360 static int pata_s3c_softreset(struct ata_link *link, unsigned int *classes,
 361                          unsigned long deadline)
 362 {
 363         struct ata_port *ap = link->ap;
 364         unsigned int devmask = 0;
 365         int rc;
 366         u8 err;
 367
 368         /* determine if device 0 is present */
 369         if (pata_s3c_devchk(ap, 0))
 370                 devmask |= (1 << 0);
 371
 372         /* select device 0 again */
 373         pata_s3c_dev_select(ap, 0);
 374
 375         /* issue bus reset */
 376         rc = pata_s3c_bus_softreset(ap, deadline);
 377         /* if link is occupied, -ENODEV too is an error */
 378         if (rc && rc != -ENODEV) {
 379                 ata_link_err(link, "SRST failed (errno=%d)\n", rc);
 380                 return rc;
 381         }
 382
 383         /* determine by signature whether we have ATA or ATAPI devices */
 384         classes[0] = ata_sff_dev_classify(&ap->link.device[0],
 385                                           devmask & (1 << 0), &err);
 386
 387         return 0;
 388 }
 389
 390 /*
 391  * pata_s3c_set_devctl - Write device control register
 392  */
 393 static void pata_s3c_set_devctl(struct ata_port *ap, u8 ctl)
 394 {
 395         ata_outb(ap->host, ctl, ap->ioaddr.ctl_addr);
 396 }
 397
 398 static struct scsi_host_template pata_s3c_sht = {
 399         ATA_PIO_SHT(DRV_NAME),
 400 };
 401
 402 static struct ata_port_operations pata_s3c_port_ops = {
 403         .inherits               = &ata_sff_port_ops,
 404         .sff_check_status       = pata_s3c_check_status,
 405         .sff_check_altstatus    = pata_s3c_check_altstatus,
 406         .sff_tf_load            = pata_s3c_tf_load,
 407         .sff_tf_read            = pata_s3c_tf_read,
 408         .sff_data_xfer          = pata_s3c_data_xfer,
 409         .sff_exec_command       = pata_s3c_exec_command,
 410         .sff_dev_select         = pata_s3c_dev_select,
 411         .sff_set_devctl         = pata_s3c_set_devctl,
 412         .softreset              = pata_s3c_softreset,
 413         .set_piomode            = pata_s3c_set_piomode,
 414 };
 415
 416 static struct ata_port_operations pata_s5p_port_ops = {
 417         .inherits               = &ata_sff_port_ops,
 418         .set_piomode            = pata_s3c_set_piomode,
 419 };
 420
 421 static void pata_s3c_enable(void __iomem *s3c_ide_regbase, bool state)
 422 {
 423         u32 temp = readl(s3c_ide_regbase + S3C_ATA_CTRL);
 424         temp = state ? (temp | 1) : (temp & ~1);
 425         writel(temp, s3c_ide_regbase + S3C_ATA_CTRL);
 426 }
 427
 428 static irqreturn_t pata_s3c_irq(int irq, void *dev_instance)
 429 {
 430         struct ata_host *host = dev_instance;
 431         struct s3c_ide_info *info = host->private_data;
 432         u32 reg;
 433
 434         reg = readl(info->ide_addr + S3C_ATA_IRQ);
 435         writel(reg, info->ide_addr + S3C_ATA_IRQ);
 436
 437         return ata_sff_interrupt(irq, dev_instance);
 438 }
 439
 440 static void pata_s3c_hwinit(struct s3c_ide_info *info,
 441                                 struct s3c_ide_platdata *pdata)
 442 {
 443         switch (info->cpu_type) {
 444         case TYPE_S3C64XX:
 445                 /* Configure as big endian */
 446                 pata_s3c_cfg_mode(info->sfr_addr);
 447                 pata_s3c_set_endian(info->ide_addr, 1);
 448                 pata_s3c_enable(info->ide_addr, true);
 449                 msleep(100);
 450
 451                 /* Remove IRQ Status */
 452                 writel(0x1f, info->ide_addr + S3C_ATA_IRQ);
 453                 writel(0x1b, info->ide_addr + S3C_ATA_IRQ_MSK);
 454                 break;
 455
 456         case TYPE_S5PC100:
 457                 pata_s3c_cfg_mode(info->sfr_addr);
 458                 /* FALLTHROUGH */
 459
 460         case TYPE_S5PV210:
 461                 /* Configure as little endian */
 462                 pata_s3c_set_endian(info->ide_addr, 0);
 463                 pata_s3c_enable(info->ide_addr, true);
 464                 msleep(100);
 465
 466                 /* Remove IRQ Status */
 467                 writel(0x3f, info->ide_addr + S3C_ATA_IRQ);
 468                 writel(0x3f, info->ide_addr + S3C_ATA_IRQ_MSK);
 469                 break;
 470
 471         default:
 472                 BUG();
 473         }
 474 }
 475
 476 static int __init pata_s3c_probe(struct platform_device *pdev)
 477 {
 478         struct s3c_ide_platdata *pdata = dev_get_platdata(&pdev->dev);
 479         struct device *dev = &pdev->dev;
 480         struct s3c_ide_info *info;
 481         struct resource *res;
 482         struct ata_port *ap;
 483         struct ata_host *host;
 484         enum s3c_cpu_type cpu_type;
 485         int ret;
 486
 487         cpu_type = platform_get_device_id(pdev)->driver_data;
 488
 489         info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
 490         if (!info) {
 491                 dev_err(dev, "failed to allocate memory for device data\n");
 492                 return -ENOMEM;
 493         }
 494
 495         info->irq = platform_get_irq(pdev, 0);
 496
 497         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 498         if (res == NULL) {
 499                 dev_err(dev, "failed to get mem resource\n");
 500                 return -EINVAL;
 501         }
 502
 503         if (!devm_request_mem_region(dev, res->start,
 504                                 resource_size(res), DRV_NAME)) {
 505                 dev_err(dev, "error requesting register region\n");
 506                 return -EBUSY;
 507         }
 508
 509         info->ide_addr = devm_ioremap(dev, res->start, resource_size(res));
 510         if (!info->ide_addr) {
 511                 dev_err(dev, "failed to map IO base address\n");
 512                 return -ENOMEM;
 513         }
 514
 515         info->clk = devm_clk_get(&pdev->dev, "cfcon");
 516         if (IS_ERR(info->clk)) {
 517                 dev_err(dev, "failed to get access to cf controller clock\n");
 518                 ret = PTR_ERR(info->clk);
 519                 info->clk = NULL;
 520                 return ret;
 521         }
 522
 523         clk_enable(info->clk);
 524
 525         /* init ata host */
 526         host = ata_host_alloc(dev, 1);
 527         if (!host) {
 528                 dev_err(dev, "failed to allocate ide host\n");
 529                 ret = -ENOMEM;
 530                 goto stop_clk;
 531         }
 532
 533         ap = host->ports[0];
 534         ap->pio_mask = ATA_PIO4;
 535
 536         if (cpu_type == TYPE_S3C64XX) {
 537                 ap->ops = &pata_s3c_port_ops;
 538                 info->sfr_addr = info->ide_addr + 0x1800;
 539                 info->ide_addr += 0x1900;
 540                 info->fifo_status_reg = 0x94;
 541         } else if (cpu_type == TYPE_S5PC100) {
 542                 ap->ops = &pata_s5p_port_ops;
 543                 info->sfr_addr = info->ide_addr + 0x1800;
 544                 info->ide_addr += 0x1900;
 545                 info->fifo_status_reg = 0x84;
 546         } else {
 547                 ap->ops = &pata_s5p_port_ops;
 548                 info->fifo_status_reg = 0x84;
 549         }
 550
 551         info->cpu_type = cpu_type;
 552
 553         if (info->irq <= 0) {
 554                 ap->flags |= ATA_FLAG_PIO_POLLING;
 555                 info->irq = 0;
 556                 ata_port_desc(ap, "no IRQ, using PIO polling\n");
 557         }
 558
 559         ap->ioaddr.cmd_addr =  info->ide_addr + S3C_ATA_CMD;
 560         ap->ioaddr.data_addr = info->ide_addr + S3C_ATA_PIO_DTR;
 561         ap->ioaddr.error_addr = info->ide_addr + S3C_ATA_PIO_FED;
 562         ap->ioaddr.feature_addr = info->ide_addr + S3C_ATA_PIO_FED;
 563         ap->ioaddr.nsect_addr = info->ide_addr + S3C_ATA_PIO_SCR;
 564         ap->ioaddr.lbal_addr = info->ide_addr + S3C_ATA_PIO_LLR;
 565         ap->ioaddr.lbam_addr = info->ide_addr + S3C_ATA_PIO_LMR;
 566         ap->ioaddr.lbah_addr = info->ide_addr + S3C_ATA_PIO_LHR;
 567         ap->ioaddr.device_addr = info->ide_addr + S3C_ATA_PIO_DVR;
 568         ap->ioaddr.status_addr = info->ide_addr + S3C_ATA_PIO_CSD;
 569         ap->ioaddr.command_addr = info->ide_addr + S3C_ATA_PIO_CSD;
 570         ap->ioaddr.altstatus_addr = info->ide_addr + S3C_ATA_PIO_DAD;
 571         ap->ioaddr.ctl_addr = info->ide_addr + S3C_ATA_PIO_DAD;
 572
 573         ata_port_desc(ap, "mmio cmd 0x%llx ",
 574                         (unsigned long long)res->start);
 575
 576         host->private_data = info;
 577
 578         if (pdata && pdata->setup_gpio)
 579                 pdata->setup_gpio();
 580
 581         /* Set endianness and enable the interface */
 582         pata_s3c_hwinit(info, pdata);
 583
 584         platform_set_drvdata(pdev, host);
 585
 586         return ata_host_activate(host, info->irq,
 587                         info->irq ? pata_s3c_irq : NULL,
 588                         0, &pata_s3c_sht);
 589
 590 stop_clk:
 591         clk_disable(info->clk);
 592         return ret;
 593 }
 594
 595 static int __exit pata_s3c_remove(struct platform_device *pdev)
 596 {
 597         struct ata_host *host = platform_get_drvdata(pdev);
 598         struct s3c_ide_info *info = host->private_data;
 599
 600         ata_host_detach(host);
 601
 602         clk_disable(info->clk);
 603
 604         return 0;
 605 }
 606
 607 #ifdef CONFIG_PM
 608 static int pata_s3c_suspend(struct device *dev)
 609 {
 610         struct platform_device *pdev = to_platform_device(dev);
 611         struct ata_host *host = platform_get_drvdata(pdev);
 612
 613         return ata_host_suspend(host, PMSG_SUSPEND);
 614 }
 615
 616 static int pata_s3c_resume(struct device *dev)
 617 {
 618         struct platform_device *pdev = to_platform_device(dev);
 619         struct ata_host *host = platform_get_drvdata(pdev);
 620         struct s3c_ide_platdata *pdata = dev_get_platdata(&pdev->dev);
 621         struct s3c_ide_info *info = host->private_data;
 622
 623         pata_s3c_hwinit(info, pdata);
 624         ata_host_resume(host);
 625
 626         return 0;
 627 }
 628
 629 static const struct dev_pm_ops pata_s3c_pm_ops = {
 630         .suspend        = pata_s3c_suspend,
 631         .resume         = pata_s3c_resume,
 632 };
 633 #endif
 634
 635 /* driver device registration */
 636 static struct platform_device_id pata_s3c_driver_ids[] = {
 637         {
 638                 .name           = "s3c64xx-pata",
 639                 .driver_data    = TYPE_S3C64XX,
 640         }, {
 641                 .name           = "s5pc100-pata",
 642                 .driver_data    = TYPE_S5PC100,
 643         }, {
 644                 .name           = "s5pv210-pata",
 645                 .driver_data    = TYPE_S5PV210,
 646         },
 647         { }
 648 };
 649
 650 MODULE_DEVICE_TABLE(platform, pata_s3c_driver_ids);
 651
 652 static struct platform_driver pata_s3c_driver = {
 653         .remove         = __exit_p(pata_s3c_remove),
 654         .id_table       = pata_s3c_driver_ids,
 655         .driver         = {
 656                 .name   = DRV_NAME,
 657                 .owner  = THIS_MODULE,
 658 #ifdef CONFIG_PM
 659                 .pm     = &pata_s3c_pm_ops,
 660 #endif
 661         },
 662 };
 663
 664 module_platform_driver_probe(pata_s3c_driver, pata_s3c_probe);
 665
 666 MODULE_AUTHOR("Abhilash Kesavan, <a.kesavan@samsung.com>");
 667 MODULE_DESCRIPTION("low-level driver for Samsung PATA controller");
 668 MODULE_LICENSE("GPL");
 669 MODULE_VERSION(DRV_VERSION);