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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
4 * http://www.samsung.com
5 *
6 * PATA driver for Samsung SoCs.
7 * Supports CF Interface in True IDE mode. Currently only PIO mode has been
8 * implemented; UDMA support has to be added.
9 *
10 * Based on:
11 * PATA driver for AT91SAM9260 Static Memory Controller
12 * PATA driver for Toshiba SCC controller
13*/
14
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/mod_devicetable.h>
18#include <linux/init.h>
19#include <linux/clk.h>
20#include <linux/libata.h>
21#include <linux/platform_device.h>
22#include <linux/slab.h>
23
24#include <linux/platform_data/ata-samsung_cf.h>
25
26#define DRV_NAME "pata_samsung_cf"
27#define DRV_VERSION "0.1"
28
29#define S3C_CFATA_REG(x) (x)
30#define S3C_CFATA_MUX S3C_CFATA_REG(0x0)
31#define S3C_ATA_CTRL S3C_CFATA_REG(0x0)
32#define S3C_ATA_CMD S3C_CFATA_REG(0x8)
33#define S3C_ATA_IRQ S3C_CFATA_REG(0x10)
34#define S3C_ATA_IRQ_MSK S3C_CFATA_REG(0x14)
35#define S3C_ATA_CFG S3C_CFATA_REG(0x18)
36
37#define S3C_ATA_PIO_TIME S3C_CFATA_REG(0x2c)
38#define S3C_ATA_PIO_DTR S3C_CFATA_REG(0x54)
39#define S3C_ATA_PIO_FED S3C_CFATA_REG(0x58)
40#define S3C_ATA_PIO_SCR S3C_CFATA_REG(0x5c)
41#define S3C_ATA_PIO_LLR S3C_CFATA_REG(0x60)
42#define S3C_ATA_PIO_LMR S3C_CFATA_REG(0x64)
43#define S3C_ATA_PIO_LHR S3C_CFATA_REG(0x68)
44#define S3C_ATA_PIO_DVR S3C_CFATA_REG(0x6c)
45#define S3C_ATA_PIO_CSD S3C_CFATA_REG(0x70)
46#define S3C_ATA_PIO_DAD S3C_CFATA_REG(0x74)
47#define S3C_ATA_PIO_RDATA S3C_CFATA_REG(0x7c)
48
49#define S3C_CFATA_MUX_TRUEIDE 0x01
50#define S3C_ATA_CFG_SWAP 0x40
51#define S3C_ATA_CFG_IORDYEN 0x02
52
53enum s3c_cpu_type {
54 TYPE_S3C64XX,
55 TYPE_S5PV210,
56};
57
58/*
59 * struct s3c_ide_info - S3C PATA instance.
60 * @clk: The clock resource for this controller.
61 * @ide_addr: The area mapped for the hardware registers.
62 * @sfr_addr: The area mapped for the special function registers.
63 * @irq: The IRQ number we are using.
64 * @cpu_type: The exact type of this controller.
65 * @fifo_status_reg: The ATA_FIFO_STATUS register offset.
66 */
67struct s3c_ide_info {
68 struct clk *clk;
69 void __iomem *ide_addr;
70 void __iomem *sfr_addr;
71 int irq;
72 enum s3c_cpu_type cpu_type;
73 unsigned int fifo_status_reg;
74};
75
76static void pata_s3c_set_endian(void __iomem *s3c_ide_regbase, u8 mode)
77{
78 u32 reg = readl(s3c_ide_regbase + S3C_ATA_CFG);
79 reg = mode ? (reg & ~S3C_ATA_CFG_SWAP) : (reg | S3C_ATA_CFG_SWAP);
80 writel(reg, s3c_ide_regbase + S3C_ATA_CFG);
81}
82
83static void pata_s3c_cfg_mode(void __iomem *s3c_ide_sfrbase)
84{
85 /* Select true-ide as the internal operating mode */
86 writel(readl(s3c_ide_sfrbase + S3C_CFATA_MUX) | S3C_CFATA_MUX_TRUEIDE,
87 s3c_ide_sfrbase + S3C_CFATA_MUX);
88}
89
90static unsigned long
91pata_s3c_setup_timing(struct s3c_ide_info *info, const struct ata_timing *ata)
92{
93 int t1 = ata->setup;
94 int t2 = ata->act8b;
95 int t2i = ata->rec8b;
96 ulong piotime;
97
98 piotime = ((t2i & 0xff) << 12) | ((t2 & 0xff) << 4) | (t1 & 0xf);
99
100 return piotime;
101}
102
103static void pata_s3c_set_piomode(struct ata_port *ap, struct ata_device *adev)
104{
105 struct s3c_ide_info *info = ap->host->private_data;
106 struct ata_timing timing;
107 int cycle_time;
108 ulong ata_cfg = readl(info->ide_addr + S3C_ATA_CFG);
109 ulong piotime;
110
111 /* Enables IORDY if mode requires it */
112 if (ata_pio_need_iordy(adev))
113 ata_cfg |= S3C_ATA_CFG_IORDYEN;
114 else
115 ata_cfg &= ~S3C_ATA_CFG_IORDYEN;
116
117 cycle_time = (int)(1000000000UL / clk_get_rate(info->clk));
118
119 ata_timing_compute(adev, adev->pio_mode, &timing,
120 cycle_time * 1000, 0);
121
122 piotime = pata_s3c_setup_timing(info, &timing);
123
124 writel(ata_cfg, info->ide_addr + S3C_ATA_CFG);
125 writel(piotime, info->ide_addr + S3C_ATA_PIO_TIME);
126}
127
128/*
129 * Waits until the IDE controller is able to perform next read/write
130 * operation to the disk. Needed for 64XX series boards only.
131 */
132static int wait_for_host_ready(struct s3c_ide_info *info)
133{
134 ulong timeout;
135 void __iomem *fifo_reg = info->ide_addr + info->fifo_status_reg;
136
137 /* wait for maximum of 20 msec */
138 timeout = jiffies + msecs_to_jiffies(20);
139 while (time_before(jiffies, timeout)) {
140 if ((readl(fifo_reg) >> 28) == 0)
141 return 0;
142 }
143 return -EBUSY;
144}
145
146/*
147 * Writes to one of the task file registers.
148 */
149static void ata_outb(struct ata_host *host, u8 addr, void __iomem *reg)
150{
151 struct s3c_ide_info *info = host->private_data;
152
153 wait_for_host_ready(info);
154 writeb(addr, reg);
155}
156
157/*
158 * Reads from one of the task file registers.
159 */
160static u8 ata_inb(struct ata_host *host, void __iomem *reg)
161{
162 struct s3c_ide_info *info = host->private_data;
163 u8 temp;
164
165 wait_for_host_ready(info);
166 (void) readb(reg);
167 wait_for_host_ready(info);
168 temp = readb(info->ide_addr + S3C_ATA_PIO_RDATA);
169 return temp;
170}
171
172/*
173 * pata_s3c_tf_load - send taskfile registers to host controller
174 */
175static void pata_s3c_tf_load(struct ata_port *ap,
176 const struct ata_taskfile *tf)
177{
178 struct ata_ioports *ioaddr = &ap->ioaddr;
179 unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
180
181 if (tf->ctl != ap->last_ctl) {
182 ata_outb(ap->host, tf->ctl, ioaddr->ctl_addr);
183 ap->last_ctl = tf->ctl;
184 ata_wait_idle(ap);
185 }
186
187 if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
188 ata_outb(ap->host, tf->hob_feature, ioaddr->feature_addr);
189 ata_outb(ap->host, tf->hob_nsect, ioaddr->nsect_addr);
190 ata_outb(ap->host, tf->hob_lbal, ioaddr->lbal_addr);
191 ata_outb(ap->host, tf->hob_lbam, ioaddr->lbam_addr);
192 ata_outb(ap->host, tf->hob_lbah, ioaddr->lbah_addr);
193 }
194
195 if (is_addr) {
196 ata_outb(ap->host, tf->feature, ioaddr->feature_addr);
197 ata_outb(ap->host, tf->nsect, ioaddr->nsect_addr);
198 ata_outb(ap->host, tf->lbal, ioaddr->lbal_addr);
199 ata_outb(ap->host, tf->lbam, ioaddr->lbam_addr);
200 ata_outb(ap->host, tf->lbah, ioaddr->lbah_addr);
201 }
202
203 if (tf->flags & ATA_TFLAG_DEVICE)
204 ata_outb(ap->host, tf->device, ioaddr->device_addr);
205
206 ata_wait_idle(ap);
207}
208
209/*
210 * pata_s3c_tf_read - input device's ATA taskfile shadow registers
211 */
212static void pata_s3c_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
213{
214 struct ata_ioports *ioaddr = &ap->ioaddr;
215
216 tf->feature = ata_inb(ap->host, ioaddr->error_addr);
217 tf->nsect = ata_inb(ap->host, ioaddr->nsect_addr);
218 tf->lbal = ata_inb(ap->host, ioaddr->lbal_addr);
219 tf->lbam = ata_inb(ap->host, ioaddr->lbam_addr);
220 tf->lbah = ata_inb(ap->host, ioaddr->lbah_addr);
221 tf->device = ata_inb(ap->host, ioaddr->device_addr);
222
223 if (tf->flags & ATA_TFLAG_LBA48) {
224 ata_outb(ap->host, tf->ctl | ATA_HOB, ioaddr->ctl_addr);
225 tf->hob_feature = ata_inb(ap->host, ioaddr->error_addr);
226 tf->hob_nsect = ata_inb(ap->host, ioaddr->nsect_addr);
227 tf->hob_lbal = ata_inb(ap->host, ioaddr->lbal_addr);
228 tf->hob_lbam = ata_inb(ap->host, ioaddr->lbam_addr);
229 tf->hob_lbah = ata_inb(ap->host, ioaddr->lbah_addr);
230 ata_outb(ap->host, tf->ctl, ioaddr->ctl_addr);
231 ap->last_ctl = tf->ctl;
232 }
233}
234
235/*
236 * pata_s3c_exec_command - issue ATA command to host controller
237 */
238static void pata_s3c_exec_command(struct ata_port *ap,
239 const struct ata_taskfile *tf)
240{
241 ata_outb(ap->host, tf->command, ap->ioaddr.command_addr);
242 ata_sff_pause(ap);
243}
244
245/*
246 * pata_s3c_check_status - Read device status register
247 */
248static u8 pata_s3c_check_status(struct ata_port *ap)
249{
250 return ata_inb(ap->host, ap->ioaddr.status_addr);
251}
252
253/*
254 * pata_s3c_check_altstatus - Read alternate device status register
255 */
256static u8 pata_s3c_check_altstatus(struct ata_port *ap)
257{
258 return ata_inb(ap->host, ap->ioaddr.altstatus_addr);
259}
260
261/*
262 * pata_s3c_data_xfer - Transfer data by PIO
263 */
264static unsigned int pata_s3c_data_xfer(struct ata_queued_cmd *qc,
265 unsigned char *buf, unsigned int buflen, int rw)
266{
267 struct ata_port *ap = qc->dev->link->ap;
268 struct s3c_ide_info *info = ap->host->private_data;
269 void __iomem *data_addr = ap->ioaddr.data_addr;
270 unsigned int words = buflen >> 1, i;
271 u16 *data_ptr = (u16 *)buf;
272
273 /* Requires wait same as in ata_inb/ata_outb */
274 if (rw == READ)
275 for (i = 0; i < words; i++, data_ptr++) {
276 wait_for_host_ready(info);
277 (void) readw(data_addr);
278 wait_for_host_ready(info);
279 *data_ptr = readw(info->ide_addr
280 + S3C_ATA_PIO_RDATA);
281 }
282 else
283 for (i = 0; i < words; i++, data_ptr++) {
284 wait_for_host_ready(info);
285 writew(*data_ptr, data_addr);
286 }
287
288 if (buflen & 0x01)
289 dev_err(ap->dev, "unexpected trailing data\n");
290
291 return words << 1;
292}
293
294/*
295 * pata_s3c_dev_select - Select device on ATA bus
296 */
297static void pata_s3c_dev_select(struct ata_port *ap, unsigned int device)
298{
299 u8 tmp = ATA_DEVICE_OBS;
300
301 if (device != 0)
302 tmp |= ATA_DEV1;
303
304 ata_outb(ap->host, tmp, ap->ioaddr.device_addr);
305 ata_sff_pause(ap);
306}
307
308/*
309 * pata_s3c_devchk - PATA device presence detection
310 */
311static unsigned int pata_s3c_devchk(struct ata_port *ap,
312 unsigned int device)
313{
314 struct ata_ioports *ioaddr = &ap->ioaddr;
315 u8 nsect, lbal;
316
317 pata_s3c_dev_select(ap, device);
318
319 ata_outb(ap->host, 0x55, ioaddr->nsect_addr);
320 ata_outb(ap->host, 0xaa, ioaddr->lbal_addr);
321
322 ata_outb(ap->host, 0xaa, ioaddr->nsect_addr);
323 ata_outb(ap->host, 0x55, ioaddr->lbal_addr);
324
325 ata_outb(ap->host, 0x55, ioaddr->nsect_addr);
326 ata_outb(ap->host, 0xaa, ioaddr->lbal_addr);
327
328 nsect = ata_inb(ap->host, ioaddr->nsect_addr);
329 lbal = ata_inb(ap->host, ioaddr->lbal_addr);
330
331 if ((nsect == 0x55) && (lbal == 0xaa))
332 return 1; /* we found a device */
333
334 return 0; /* nothing found */
335}
336
337/*
338 * pata_s3c_wait_after_reset - wait for devices to become ready after reset
339 */
340static int pata_s3c_wait_after_reset(struct ata_link *link,
341 unsigned long deadline)
342{
343 int rc;
344
345 ata_msleep(link->ap, ATA_WAIT_AFTER_RESET);
346
347 /* always check readiness of the master device */
348 rc = ata_sff_wait_ready(link, deadline);
349 /* -ENODEV means the odd clown forgot the D7 pulldown resistor
350 * and TF status is 0xff, bail out on it too.
351 */
352 if (rc)
353 return rc;
354
355 return 0;
356}
357
358/*
359 * pata_s3c_bus_softreset - PATA device software reset
360 */
361static int pata_s3c_bus_softreset(struct ata_port *ap,
362 unsigned long deadline)
363{
364 struct ata_ioports *ioaddr = &ap->ioaddr;
365
366 /* software reset. causes dev0 to be selected */
367 ata_outb(ap->host, ap->ctl, ioaddr->ctl_addr);
368 udelay(20);
369 ata_outb(ap->host, ap->ctl | ATA_SRST, ioaddr->ctl_addr);
370 udelay(20);
371 ata_outb(ap->host, ap->ctl, ioaddr->ctl_addr);
372 ap->last_ctl = ap->ctl;
373
374 return pata_s3c_wait_after_reset(&ap->link, deadline);
375}
376
377/*
378 * pata_s3c_softreset - reset host port via ATA SRST
379 */
380static int pata_s3c_softreset(struct ata_link *link, unsigned int *classes,
381 unsigned long deadline)
382{
383 struct ata_port *ap = link->ap;
384 unsigned int devmask = 0;
385 int rc;
386 u8 err;
387
388 /* determine if device 0 is present */
389 if (pata_s3c_devchk(ap, 0))
390 devmask |= (1 << 0);
391
392 /* select device 0 again */
393 pata_s3c_dev_select(ap, 0);
394
395 /* issue bus reset */
396 rc = pata_s3c_bus_softreset(ap, deadline);
397 /* if link is occupied, -ENODEV too is an error */
398 if (rc && rc != -ENODEV) {
399 ata_link_err(link, "SRST failed (errno=%d)\n", rc);
400 return rc;
401 }
402
403 /* determine by signature whether we have ATA or ATAPI devices */
404 classes[0] = ata_sff_dev_classify(&ap->link.device[0],
405 devmask & (1 << 0), &err);
406
407 return 0;
408}
409
410/*
411 * pata_s3c_set_devctl - Write device control register
412 */
413static void pata_s3c_set_devctl(struct ata_port *ap, u8 ctl)
414{
415 ata_outb(ap->host, ctl, ap->ioaddr.ctl_addr);
416}
417
418static struct scsi_host_template pata_s3c_sht = {
419 ATA_PIO_SHT(DRV_NAME),
420};
421
422static struct ata_port_operations pata_s3c_port_ops = {
423 .inherits = &ata_sff_port_ops,
424 .sff_check_status = pata_s3c_check_status,
425 .sff_check_altstatus = pata_s3c_check_altstatus,
426 .sff_tf_load = pata_s3c_tf_load,
427 .sff_tf_read = pata_s3c_tf_read,
428 .sff_data_xfer = pata_s3c_data_xfer,
429 .sff_exec_command = pata_s3c_exec_command,
430 .sff_dev_select = pata_s3c_dev_select,
431 .sff_set_devctl = pata_s3c_set_devctl,
432 .softreset = pata_s3c_softreset,
433 .set_piomode = pata_s3c_set_piomode,
434};
435
436static struct ata_port_operations pata_s5p_port_ops = {
437 .inherits = &ata_sff_port_ops,
438 .set_piomode = pata_s3c_set_piomode,
439};
440
441static void pata_s3c_enable(void __iomem *s3c_ide_regbase, bool state)
442{
443 u32 temp = readl(s3c_ide_regbase + S3C_ATA_CTRL);
444 temp = state ? (temp | 1) : (temp & ~1);
445 writel(temp, s3c_ide_regbase + S3C_ATA_CTRL);
446}
447
448static irqreturn_t pata_s3c_irq(int irq, void *dev_instance)
449{
450 struct ata_host *host = dev_instance;
451 struct s3c_ide_info *info = host->private_data;
452 u32 reg;
453
454 reg = readl(info->ide_addr + S3C_ATA_IRQ);
455 writel(reg, info->ide_addr + S3C_ATA_IRQ);
456
457 return ata_sff_interrupt(irq, dev_instance);
458}
459
460static void pata_s3c_hwinit(struct s3c_ide_info *info,
461 struct s3c_ide_platdata *pdata)
462{
463 switch (info->cpu_type) {
464 case TYPE_S3C64XX:
465 /* Configure as big endian */
466 pata_s3c_cfg_mode(info->sfr_addr);
467 pata_s3c_set_endian(info->ide_addr, 1);
468 pata_s3c_enable(info->ide_addr, true);
469 msleep(100);
470
471 /* Remove IRQ Status */
472 writel(0x1f, info->ide_addr + S3C_ATA_IRQ);
473 writel(0x1b, info->ide_addr + S3C_ATA_IRQ_MSK);
474 break;
475
476 case TYPE_S5PV210:
477 /* Configure as little endian */
478 pata_s3c_set_endian(info->ide_addr, 0);
479 pata_s3c_enable(info->ide_addr, true);
480 msleep(100);
481
482 /* Remove IRQ Status */
483 writel(0x3f, info->ide_addr + S3C_ATA_IRQ);
484 writel(0x3f, info->ide_addr + S3C_ATA_IRQ_MSK);
485 break;
486
487 default:
488 BUG();
489 }
490}
491
492static int __init pata_s3c_probe(struct platform_device *pdev)
493{
494 struct s3c_ide_platdata *pdata = dev_get_platdata(&pdev->dev);
495 struct device *dev = &pdev->dev;
496 struct s3c_ide_info *info;
497 struct resource *res;
498 struct ata_port *ap;
499 struct ata_host *host;
500 enum s3c_cpu_type cpu_type;
501 int ret;
502
503 cpu_type = platform_get_device_id(pdev)->driver_data;
504
505 info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
506 if (!info)
507 return -ENOMEM;
508
509 info->irq = platform_get_irq(pdev, 0);
510
511 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
512
513 info->ide_addr = devm_ioremap_resource(dev, res);
514 if (IS_ERR(info->ide_addr))
515 return PTR_ERR(info->ide_addr);
516
517 info->clk = devm_clk_get(&pdev->dev, "cfcon");
518 if (IS_ERR(info->clk)) {
519 dev_err(dev, "failed to get access to cf controller clock\n");
520 ret = PTR_ERR(info->clk);
521 info->clk = NULL;
522 return ret;
523 }
524
525 clk_enable(info->clk);
526
527 /* init ata host */
528 host = ata_host_alloc(dev, 1);
529 if (!host) {
530 dev_err(dev, "failed to allocate ide host\n");
531 ret = -ENOMEM;
532 goto stop_clk;
533 }
534
535 ap = host->ports[0];
536 ap->pio_mask = ATA_PIO4;
537
538 if (cpu_type == TYPE_S3C64XX) {
539 ap->ops = &pata_s3c_port_ops;
540 info->sfr_addr = info->ide_addr + 0x1800;
541 info->ide_addr += 0x1900;
542 info->fifo_status_reg = 0x94;
543 } else {
544 ap->ops = &pata_s5p_port_ops;
545 info->fifo_status_reg = 0x84;
546 }
547
548 info->cpu_type = cpu_type;
549
550 if (info->irq <= 0) {
551 ap->flags |= ATA_FLAG_PIO_POLLING;
552 info->irq = 0;
553 ata_port_desc(ap, "no IRQ, using PIO polling\n");
554 }
555
556 ap->ioaddr.cmd_addr = info->ide_addr + S3C_ATA_CMD;
557 ap->ioaddr.data_addr = info->ide_addr + S3C_ATA_PIO_DTR;
558 ap->ioaddr.error_addr = info->ide_addr + S3C_ATA_PIO_FED;
559 ap->ioaddr.feature_addr = info->ide_addr + S3C_ATA_PIO_FED;
560 ap->ioaddr.nsect_addr = info->ide_addr + S3C_ATA_PIO_SCR;
561 ap->ioaddr.lbal_addr = info->ide_addr + S3C_ATA_PIO_LLR;
562 ap->ioaddr.lbam_addr = info->ide_addr + S3C_ATA_PIO_LMR;
563 ap->ioaddr.lbah_addr = info->ide_addr + S3C_ATA_PIO_LHR;
564 ap->ioaddr.device_addr = info->ide_addr + S3C_ATA_PIO_DVR;
565 ap->ioaddr.status_addr = info->ide_addr + S3C_ATA_PIO_CSD;
566 ap->ioaddr.command_addr = info->ide_addr + S3C_ATA_PIO_CSD;
567 ap->ioaddr.altstatus_addr = info->ide_addr + S3C_ATA_PIO_DAD;
568 ap->ioaddr.ctl_addr = info->ide_addr + S3C_ATA_PIO_DAD;
569
570 ata_port_desc(ap, "mmio cmd 0x%llx ",
571 (unsigned long long)res->start);
572
573 host->private_data = info;
574
575 if (pdata && pdata->setup_gpio)
576 pdata->setup_gpio();
577
578 /* Set endianness and enable the interface */
579 pata_s3c_hwinit(info, pdata);
580
581 ret = ata_host_activate(host, info->irq,
582 info->irq ? pata_s3c_irq : NULL,
583 0, &pata_s3c_sht);
584 if (ret)
585 goto stop_clk;
586
587 return 0;
588
589stop_clk:
590 clk_disable(info->clk);
591 return ret;
592}
593
594static int __exit pata_s3c_remove(struct platform_device *pdev)
595{
596 struct ata_host *host = platform_get_drvdata(pdev);
597 struct s3c_ide_info *info = host->private_data;
598
599 ata_host_detach(host);
600
601 clk_disable(info->clk);
602
603 return 0;
604}
605
606#ifdef CONFIG_PM_SLEEP
607static int pata_s3c_suspend(struct device *dev)
608{
609 struct ata_host *host = dev_get_drvdata(dev);
610
611 return ata_host_suspend(host, PMSG_SUSPEND);
612}
613
614static int pata_s3c_resume(struct device *dev)
615{
616 struct ata_host *host = dev_get_drvdata(dev);
617 struct s3c_ide_platdata *pdata = dev_get_platdata(dev);
618 struct s3c_ide_info *info = host->private_data;
619
620 pata_s3c_hwinit(info, pdata);
621 ata_host_resume(host);
622
623 return 0;
624}
625
626static const struct dev_pm_ops pata_s3c_pm_ops = {
627 .suspend = pata_s3c_suspend,
628 .resume = pata_s3c_resume,
629};
630#endif
631
632/* driver device registration */
633static const struct platform_device_id pata_s3c_driver_ids[] = {
634 {
635 .name = "s3c64xx-pata",
636 .driver_data = TYPE_S3C64XX,
637 }, {
638 .name = "s5pv210-pata",
639 .driver_data = TYPE_S5PV210,
640 },
641 { }
642};
643
644MODULE_DEVICE_TABLE(platform, pata_s3c_driver_ids);
645
646static struct platform_driver pata_s3c_driver = {
647 .remove = __exit_p(pata_s3c_remove),
648 .id_table = pata_s3c_driver_ids,
649 .driver = {
650 .name = DRV_NAME,
651#ifdef CONFIG_PM_SLEEP
652 .pm = &pata_s3c_pm_ops,
653#endif
654 },
655};
656
657module_platform_driver_probe(pata_s3c_driver, pata_s3c_probe);
658
659MODULE_AUTHOR("Abhilash Kesavan, <a.kesavan@samsung.com>");
660MODULE_DESCRIPTION("low-level driver for Samsung PATA controller");
661MODULE_LICENSE("GPL");
662MODULE_VERSION(DRV_VERSION);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
4 * http://www.samsung.com
5 *
6 * PATA driver for Samsung SoCs.
7 * Supports CF Interface in True IDE mode. Currently only PIO mode has been
8 * implemented; UDMA support has to be added.
9 *
10 * Based on:
11 * PATA driver for AT91SAM9260 Static Memory Controller
12 * PATA driver for Toshiba SCC controller
13*/
14
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/mod_devicetable.h>
18#include <linux/init.h>
19#include <linux/clk.h>
20#include <linux/libata.h>
21#include <linux/platform_device.h>
22#include <linux/slab.h>
23
24#include <linux/platform_data/ata-samsung_cf.h>
25
26#define DRV_NAME "pata_samsung_cf"
27#define DRV_VERSION "0.1"
28
29#define S3C_CFATA_REG(x) (x)
30#define S3C_CFATA_MUX S3C_CFATA_REG(0x0)
31#define S3C_ATA_CTRL S3C_CFATA_REG(0x0)
32#define S3C_ATA_CMD S3C_CFATA_REG(0x8)
33#define S3C_ATA_IRQ S3C_CFATA_REG(0x10)
34#define S3C_ATA_IRQ_MSK S3C_CFATA_REG(0x14)
35#define S3C_ATA_CFG S3C_CFATA_REG(0x18)
36
37#define S3C_ATA_PIO_TIME S3C_CFATA_REG(0x2c)
38#define S3C_ATA_PIO_DTR S3C_CFATA_REG(0x54)
39#define S3C_ATA_PIO_FED S3C_CFATA_REG(0x58)
40#define S3C_ATA_PIO_SCR S3C_CFATA_REG(0x5c)
41#define S3C_ATA_PIO_LLR S3C_CFATA_REG(0x60)
42#define S3C_ATA_PIO_LMR S3C_CFATA_REG(0x64)
43#define S3C_ATA_PIO_LHR S3C_CFATA_REG(0x68)
44#define S3C_ATA_PIO_DVR S3C_CFATA_REG(0x6c)
45#define S3C_ATA_PIO_CSD S3C_CFATA_REG(0x70)
46#define S3C_ATA_PIO_DAD S3C_CFATA_REG(0x74)
47#define S3C_ATA_PIO_RDATA S3C_CFATA_REG(0x7c)
48
49#define S3C_CFATA_MUX_TRUEIDE 0x01
50#define S3C_ATA_CFG_SWAP 0x40
51#define S3C_ATA_CFG_IORDYEN 0x02
52
53enum s3c_cpu_type {
54 TYPE_S3C64XX,
55 TYPE_S5PV210,
56};
57
58/*
59 * struct s3c_ide_info - S3C PATA instance.
60 * @clk: The clock resource for this controller.
61 * @ide_addr: The area mapped for the hardware registers.
62 * @sfr_addr: The area mapped for the special function registers.
63 * @irq: The IRQ number we are using.
64 * @cpu_type: The exact type of this controller.
65 * @fifo_status_reg: The ATA_FIFO_STATUS register offset.
66 */
67struct s3c_ide_info {
68 struct clk *clk;
69 void __iomem *ide_addr;
70 void __iomem *sfr_addr;
71 int irq;
72 enum s3c_cpu_type cpu_type;
73 unsigned int fifo_status_reg;
74};
75
76static void pata_s3c_set_endian(void __iomem *s3c_ide_regbase, u8 mode)
77{
78 u32 reg = readl(s3c_ide_regbase + S3C_ATA_CFG);
79 reg = mode ? (reg & ~S3C_ATA_CFG_SWAP) : (reg | S3C_ATA_CFG_SWAP);
80 writel(reg, s3c_ide_regbase + S3C_ATA_CFG);
81}
82
83static void pata_s3c_cfg_mode(void __iomem *s3c_ide_sfrbase)
84{
85 /* Select true-ide as the internal operating mode */
86 writel(readl(s3c_ide_sfrbase + S3C_CFATA_MUX) | S3C_CFATA_MUX_TRUEIDE,
87 s3c_ide_sfrbase + S3C_CFATA_MUX);
88}
89
90static unsigned long
91pata_s3c_setup_timing(struct s3c_ide_info *info, const struct ata_timing *ata)
92{
93 int t1 = ata->setup;
94 int t2 = ata->act8b;
95 int t2i = ata->rec8b;
96 ulong piotime;
97
98 piotime = ((t2i & 0xff) << 12) | ((t2 & 0xff) << 4) | (t1 & 0xf);
99
100 return piotime;
101}
102
103static void pata_s3c_set_piomode(struct ata_port *ap, struct ata_device *adev)
104{
105 struct s3c_ide_info *info = ap->host->private_data;
106 struct ata_timing timing;
107 int cycle_time;
108 ulong ata_cfg = readl(info->ide_addr + S3C_ATA_CFG);
109 ulong piotime;
110
111 /* Enables IORDY if mode requires it */
112 if (ata_pio_need_iordy(adev))
113 ata_cfg |= S3C_ATA_CFG_IORDYEN;
114 else
115 ata_cfg &= ~S3C_ATA_CFG_IORDYEN;
116
117 cycle_time = (int)(1000000000UL / clk_get_rate(info->clk));
118
119 ata_timing_compute(adev, adev->pio_mode, &timing,
120 cycle_time * 1000, 0);
121
122 piotime = pata_s3c_setup_timing(info, &timing);
123
124 writel(ata_cfg, info->ide_addr + S3C_ATA_CFG);
125 writel(piotime, info->ide_addr + S3C_ATA_PIO_TIME);
126}
127
128/*
129 * Waits until the IDE controller is able to perform next read/write
130 * operation to the disk. Needed for 64XX series boards only.
131 */
132static int wait_for_host_ready(struct s3c_ide_info *info)
133{
134 ulong timeout;
135 void __iomem *fifo_reg = info->ide_addr + info->fifo_status_reg;
136
137 /* wait for maximum of 20 msec */
138 timeout = jiffies + msecs_to_jiffies(20);
139 while (time_before(jiffies, timeout)) {
140 if ((readl(fifo_reg) >> 28) == 0)
141 return 0;
142 }
143 return -EBUSY;
144}
145
146/*
147 * Writes to one of the task file registers.
148 */
149static void ata_outb(struct ata_host *host, u8 addr, void __iomem *reg)
150{
151 struct s3c_ide_info *info = host->private_data;
152
153 wait_for_host_ready(info);
154 writeb(addr, reg);
155}
156
157/*
158 * Reads from one of the task file registers.
159 */
160static u8 ata_inb(struct ata_host *host, void __iomem *reg)
161{
162 struct s3c_ide_info *info = host->private_data;
163 u8 temp;
164
165 wait_for_host_ready(info);
166 (void) readb(reg);
167 wait_for_host_ready(info);
168 temp = readb(info->ide_addr + S3C_ATA_PIO_RDATA);
169 return temp;
170}
171
172/*
173 * pata_s3c_tf_load - send taskfile registers to host controller
174 */
175static void pata_s3c_tf_load(struct ata_port *ap,
176 const struct ata_taskfile *tf)
177{
178 struct ata_ioports *ioaddr = &ap->ioaddr;
179 unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
180
181 if (tf->ctl != ap->last_ctl) {
182 ata_outb(ap->host, tf->ctl, ioaddr->ctl_addr);
183 ap->last_ctl = tf->ctl;
184 ata_wait_idle(ap);
185 }
186
187 if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
188 ata_outb(ap->host, tf->hob_feature, ioaddr->feature_addr);
189 ata_outb(ap->host, tf->hob_nsect, ioaddr->nsect_addr);
190 ata_outb(ap->host, tf->hob_lbal, ioaddr->lbal_addr);
191 ata_outb(ap->host, tf->hob_lbam, ioaddr->lbam_addr);
192 ata_outb(ap->host, tf->hob_lbah, ioaddr->lbah_addr);
193 }
194
195 if (is_addr) {
196 ata_outb(ap->host, tf->feature, ioaddr->feature_addr);
197 ata_outb(ap->host, tf->nsect, ioaddr->nsect_addr);
198 ata_outb(ap->host, tf->lbal, ioaddr->lbal_addr);
199 ata_outb(ap->host, tf->lbam, ioaddr->lbam_addr);
200 ata_outb(ap->host, tf->lbah, ioaddr->lbah_addr);
201 }
202
203 if (tf->flags & ATA_TFLAG_DEVICE)
204 ata_outb(ap->host, tf->device, ioaddr->device_addr);
205
206 ata_wait_idle(ap);
207}
208
209/*
210 * pata_s3c_tf_read - input device's ATA taskfile shadow registers
211 */
212static void pata_s3c_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
213{
214 struct ata_ioports *ioaddr = &ap->ioaddr;
215
216 tf->error = ata_inb(ap->host, ioaddr->error_addr);
217 tf->nsect = ata_inb(ap->host, ioaddr->nsect_addr);
218 tf->lbal = ata_inb(ap->host, ioaddr->lbal_addr);
219 tf->lbam = ata_inb(ap->host, ioaddr->lbam_addr);
220 tf->lbah = ata_inb(ap->host, ioaddr->lbah_addr);
221 tf->device = ata_inb(ap->host, ioaddr->device_addr);
222
223 if (tf->flags & ATA_TFLAG_LBA48) {
224 ata_outb(ap->host, tf->ctl | ATA_HOB, ioaddr->ctl_addr);
225 tf->hob_feature = ata_inb(ap->host, ioaddr->error_addr);
226 tf->hob_nsect = ata_inb(ap->host, ioaddr->nsect_addr);
227 tf->hob_lbal = ata_inb(ap->host, ioaddr->lbal_addr);
228 tf->hob_lbam = ata_inb(ap->host, ioaddr->lbam_addr);
229 tf->hob_lbah = ata_inb(ap->host, ioaddr->lbah_addr);
230 ata_outb(ap->host, tf->ctl, ioaddr->ctl_addr);
231 ap->last_ctl = tf->ctl;
232 }
233}
234
235/*
236 * pata_s3c_exec_command - issue ATA command to host controller
237 */
238static void pata_s3c_exec_command(struct ata_port *ap,
239 const struct ata_taskfile *tf)
240{
241 ata_outb(ap->host, tf->command, ap->ioaddr.command_addr);
242 ata_sff_pause(ap);
243}
244
245/*
246 * pata_s3c_check_status - Read device status register
247 */
248static u8 pata_s3c_check_status(struct ata_port *ap)
249{
250 return ata_inb(ap->host, ap->ioaddr.status_addr);
251}
252
253/*
254 * pata_s3c_check_altstatus - Read alternate device status register
255 */
256static u8 pata_s3c_check_altstatus(struct ata_port *ap)
257{
258 return ata_inb(ap->host, ap->ioaddr.altstatus_addr);
259}
260
261/*
262 * pata_s3c_data_xfer - Transfer data by PIO
263 */
264static unsigned int pata_s3c_data_xfer(struct ata_queued_cmd *qc,
265 unsigned char *buf, unsigned int buflen, int rw)
266{
267 struct ata_port *ap = qc->dev->link->ap;
268 struct s3c_ide_info *info = ap->host->private_data;
269 void __iomem *data_addr = ap->ioaddr.data_addr;
270 unsigned int words = buflen >> 1, i;
271 u16 *data_ptr = (u16 *)buf;
272
273 /* Requires wait same as in ata_inb/ata_outb */
274 if (rw == READ)
275 for (i = 0; i < words; i++, data_ptr++) {
276 wait_for_host_ready(info);
277 (void) readw(data_addr);
278 wait_for_host_ready(info);
279 *data_ptr = readw(info->ide_addr
280 + S3C_ATA_PIO_RDATA);
281 }
282 else
283 for (i = 0; i < words; i++, data_ptr++) {
284 wait_for_host_ready(info);
285 writew(*data_ptr, data_addr);
286 }
287
288 if (buflen & 0x01)
289 dev_err(ap->dev, "unexpected trailing data\n");
290
291 return words << 1;
292}
293
294/*
295 * pata_s3c_dev_select - Select device on ATA bus
296 */
297static void pata_s3c_dev_select(struct ata_port *ap, unsigned int device)
298{
299 u8 tmp = ATA_DEVICE_OBS;
300
301 if (device != 0)
302 tmp |= ATA_DEV1;
303
304 ata_outb(ap->host, tmp, ap->ioaddr.device_addr);
305 ata_sff_pause(ap);
306}
307
308/*
309 * pata_s3c_devchk - PATA device presence detection
310 */
311static bool pata_s3c_devchk(struct ata_port *ap, unsigned int device)
312{
313 struct ata_ioports *ioaddr = &ap->ioaddr;
314 u8 nsect, lbal;
315
316 pata_s3c_dev_select(ap, device);
317
318 ata_outb(ap->host, 0x55, ioaddr->nsect_addr);
319 ata_outb(ap->host, 0xaa, ioaddr->lbal_addr);
320
321 ata_outb(ap->host, 0xaa, ioaddr->nsect_addr);
322 ata_outb(ap->host, 0x55, ioaddr->lbal_addr);
323
324 ata_outb(ap->host, 0x55, ioaddr->nsect_addr);
325 ata_outb(ap->host, 0xaa, ioaddr->lbal_addr);
326
327 nsect = ata_inb(ap->host, ioaddr->nsect_addr);
328 lbal = ata_inb(ap->host, ioaddr->lbal_addr);
329
330 if ((nsect == 0x55) && (lbal == 0xaa))
331 return true; /* we found a device */
332
333 return false; /* nothing found */
334}
335
336/*
337 * pata_s3c_wait_after_reset - wait for devices to become ready after reset
338 */
339static int pata_s3c_wait_after_reset(struct ata_link *link,
340 unsigned long deadline)
341{
342 int rc;
343
344 ata_msleep(link->ap, ATA_WAIT_AFTER_RESET);
345
346 /* always check readiness of the master device */
347 rc = ata_sff_wait_ready(link, deadline);
348 /* -ENODEV means the odd clown forgot the D7 pulldown resistor
349 * and TF status is 0xff, bail out on it too.
350 */
351 if (rc)
352 return rc;
353
354 return 0;
355}
356
357/*
358 * pata_s3c_bus_softreset - PATA device software reset
359 */
360static int pata_s3c_bus_softreset(struct ata_port *ap,
361 unsigned long deadline)
362{
363 struct ata_ioports *ioaddr = &ap->ioaddr;
364
365 /* software reset. causes dev0 to be selected */
366 ata_outb(ap->host, ap->ctl, ioaddr->ctl_addr);
367 udelay(20);
368 ata_outb(ap->host, ap->ctl | ATA_SRST, ioaddr->ctl_addr);
369 udelay(20);
370 ata_outb(ap->host, ap->ctl, ioaddr->ctl_addr);
371 ap->last_ctl = ap->ctl;
372
373 return pata_s3c_wait_after_reset(&ap->link, deadline);
374}
375
376/*
377 * pata_s3c_softreset - reset host port via ATA SRST
378 */
379static int pata_s3c_softreset(struct ata_link *link, unsigned int *classes,
380 unsigned long deadline)
381{
382 struct ata_port *ap = link->ap;
383 unsigned int devmask = 0;
384 int rc;
385 u8 err;
386
387 /* determine if device 0 is present */
388 if (pata_s3c_devchk(ap, 0))
389 devmask |= (1 << 0);
390
391 /* select device 0 again */
392 pata_s3c_dev_select(ap, 0);
393
394 /* issue bus reset */
395 rc = pata_s3c_bus_softreset(ap, deadline);
396 /* if link is occupied, -ENODEV too is an error */
397 if (rc && rc != -ENODEV) {
398 ata_link_err(link, "SRST failed (errno=%d)\n", rc);
399 return rc;
400 }
401
402 /* determine by signature whether we have ATA or ATAPI devices */
403 classes[0] = ata_sff_dev_classify(&ap->link.device[0],
404 devmask & (1 << 0), &err);
405
406 return 0;
407}
408
409/*
410 * pata_s3c_set_devctl - Write device control register
411 */
412static void pata_s3c_set_devctl(struct ata_port *ap, u8 ctl)
413{
414 ata_outb(ap->host, ctl, ap->ioaddr.ctl_addr);
415}
416
417static struct scsi_host_template pata_s3c_sht = {
418 ATA_PIO_SHT(DRV_NAME),
419};
420
421static struct ata_port_operations pata_s3c_port_ops = {
422 .inherits = &ata_sff_port_ops,
423 .sff_check_status = pata_s3c_check_status,
424 .sff_check_altstatus = pata_s3c_check_altstatus,
425 .sff_tf_load = pata_s3c_tf_load,
426 .sff_tf_read = pata_s3c_tf_read,
427 .sff_data_xfer = pata_s3c_data_xfer,
428 .sff_exec_command = pata_s3c_exec_command,
429 .sff_dev_select = pata_s3c_dev_select,
430 .sff_set_devctl = pata_s3c_set_devctl,
431 .softreset = pata_s3c_softreset,
432 .set_piomode = pata_s3c_set_piomode,
433};
434
435static struct ata_port_operations pata_s5p_port_ops = {
436 .inherits = &ata_sff_port_ops,
437 .set_piomode = pata_s3c_set_piomode,
438};
439
440static void pata_s3c_enable(void __iomem *s3c_ide_regbase, bool state)
441{
442 u32 temp = readl(s3c_ide_regbase + S3C_ATA_CTRL);
443 temp = state ? (temp | 1) : (temp & ~1);
444 writel(temp, s3c_ide_regbase + S3C_ATA_CTRL);
445}
446
447static irqreturn_t pata_s3c_irq(int irq, void *dev_instance)
448{
449 struct ata_host *host = dev_instance;
450 struct s3c_ide_info *info = host->private_data;
451 u32 reg;
452
453 reg = readl(info->ide_addr + S3C_ATA_IRQ);
454 writel(reg, info->ide_addr + S3C_ATA_IRQ);
455
456 return ata_sff_interrupt(irq, dev_instance);
457}
458
459static void pata_s3c_hwinit(struct s3c_ide_info *info,
460 struct s3c_ide_platdata *pdata)
461{
462 switch (info->cpu_type) {
463 case TYPE_S3C64XX:
464 /* Configure as big endian */
465 pata_s3c_cfg_mode(info->sfr_addr);
466 pata_s3c_set_endian(info->ide_addr, 1);
467 pata_s3c_enable(info->ide_addr, true);
468 msleep(100);
469
470 /* Remove IRQ Status */
471 writel(0x1f, info->ide_addr + S3C_ATA_IRQ);
472 writel(0x1b, info->ide_addr + S3C_ATA_IRQ_MSK);
473 break;
474
475 case TYPE_S5PV210:
476 /* Configure as little endian */
477 pata_s3c_set_endian(info->ide_addr, 0);
478 pata_s3c_enable(info->ide_addr, true);
479 msleep(100);
480
481 /* Remove IRQ Status */
482 writel(0x3f, info->ide_addr + S3C_ATA_IRQ);
483 writel(0x3f, info->ide_addr + S3C_ATA_IRQ_MSK);
484 break;
485
486 default:
487 BUG();
488 }
489}
490
491static int __init pata_s3c_probe(struct platform_device *pdev)
492{
493 struct s3c_ide_platdata *pdata = dev_get_platdata(&pdev->dev);
494 struct device *dev = &pdev->dev;
495 struct s3c_ide_info *info;
496 struct resource *res;
497 struct ata_port *ap;
498 struct ata_host *host;
499 enum s3c_cpu_type cpu_type;
500 int ret;
501
502 cpu_type = platform_get_device_id(pdev)->driver_data;
503
504 info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
505 if (!info)
506 return -ENOMEM;
507
508 info->irq = platform_get_irq(pdev, 0);
509
510 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
511
512 info->ide_addr = devm_ioremap_resource(dev, res);
513 if (IS_ERR(info->ide_addr))
514 return PTR_ERR(info->ide_addr);
515
516 info->clk = devm_clk_get(&pdev->dev, "cfcon");
517 if (IS_ERR(info->clk)) {
518 dev_err(dev, "failed to get access to cf controller clock\n");
519 ret = PTR_ERR(info->clk);
520 info->clk = NULL;
521 return ret;
522 }
523
524 clk_enable(info->clk);
525
526 /* init ata host */
527 host = ata_host_alloc(dev, 1);
528 if (!host) {
529 dev_err(dev, "failed to allocate ide host\n");
530 ret = -ENOMEM;
531 goto stop_clk;
532 }
533
534 ap = host->ports[0];
535 ap->pio_mask = ATA_PIO4;
536
537 if (cpu_type == TYPE_S3C64XX) {
538 ap->ops = &pata_s3c_port_ops;
539 info->sfr_addr = info->ide_addr + 0x1800;
540 info->ide_addr += 0x1900;
541 info->fifo_status_reg = 0x94;
542 } else {
543 ap->ops = &pata_s5p_port_ops;
544 info->fifo_status_reg = 0x84;
545 }
546
547 info->cpu_type = cpu_type;
548
549 if (info->irq <= 0) {
550 ap->flags |= ATA_FLAG_PIO_POLLING;
551 info->irq = 0;
552 ata_port_desc(ap, "no IRQ, using PIO polling\n");
553 }
554
555 ap->ioaddr.cmd_addr = info->ide_addr + S3C_ATA_CMD;
556 ap->ioaddr.data_addr = info->ide_addr + S3C_ATA_PIO_DTR;
557 ap->ioaddr.error_addr = info->ide_addr + S3C_ATA_PIO_FED;
558 ap->ioaddr.feature_addr = info->ide_addr + S3C_ATA_PIO_FED;
559 ap->ioaddr.nsect_addr = info->ide_addr + S3C_ATA_PIO_SCR;
560 ap->ioaddr.lbal_addr = info->ide_addr + S3C_ATA_PIO_LLR;
561 ap->ioaddr.lbam_addr = info->ide_addr + S3C_ATA_PIO_LMR;
562 ap->ioaddr.lbah_addr = info->ide_addr + S3C_ATA_PIO_LHR;
563 ap->ioaddr.device_addr = info->ide_addr + S3C_ATA_PIO_DVR;
564 ap->ioaddr.status_addr = info->ide_addr + S3C_ATA_PIO_CSD;
565 ap->ioaddr.command_addr = info->ide_addr + S3C_ATA_PIO_CSD;
566 ap->ioaddr.altstatus_addr = info->ide_addr + S3C_ATA_PIO_DAD;
567 ap->ioaddr.ctl_addr = info->ide_addr + S3C_ATA_PIO_DAD;
568
569 ata_port_desc(ap, "mmio cmd 0x%llx ",
570 (unsigned long long)res->start);
571
572 host->private_data = info;
573
574 if (pdata && pdata->setup_gpio)
575 pdata->setup_gpio();
576
577 /* Set endianness and enable the interface */
578 pata_s3c_hwinit(info, pdata);
579
580 ret = ata_host_activate(host, info->irq,
581 info->irq ? pata_s3c_irq : NULL,
582 0, &pata_s3c_sht);
583 if (ret)
584 goto stop_clk;
585
586 return 0;
587
588stop_clk:
589 clk_disable(info->clk);
590 return ret;
591}
592
593static int __exit pata_s3c_remove(struct platform_device *pdev)
594{
595 struct ata_host *host = platform_get_drvdata(pdev);
596 struct s3c_ide_info *info = host->private_data;
597
598 ata_host_detach(host);
599
600 clk_disable(info->clk);
601
602 return 0;
603}
604
605#ifdef CONFIG_PM_SLEEP
606static int pata_s3c_suspend(struct device *dev)
607{
608 struct ata_host *host = dev_get_drvdata(dev);
609
610 ata_host_suspend(host, PMSG_SUSPEND);
611 return 0;
612}
613
614static int pata_s3c_resume(struct device *dev)
615{
616 struct ata_host *host = dev_get_drvdata(dev);
617 struct s3c_ide_platdata *pdata = dev_get_platdata(dev);
618 struct s3c_ide_info *info = host->private_data;
619
620 pata_s3c_hwinit(info, pdata);
621 ata_host_resume(host);
622
623 return 0;
624}
625
626static const struct dev_pm_ops pata_s3c_pm_ops = {
627 .suspend = pata_s3c_suspend,
628 .resume = pata_s3c_resume,
629};
630#endif
631
632/* driver device registration */
633static const struct platform_device_id pata_s3c_driver_ids[] = {
634 {
635 .name = "s3c64xx-pata",
636 .driver_data = TYPE_S3C64XX,
637 }, {
638 .name = "s5pv210-pata",
639 .driver_data = TYPE_S5PV210,
640 },
641 { }
642};
643
644MODULE_DEVICE_TABLE(platform, pata_s3c_driver_ids);
645
646static struct platform_driver pata_s3c_driver = {
647 .remove = __exit_p(pata_s3c_remove),
648 .id_table = pata_s3c_driver_ids,
649 .driver = {
650 .name = DRV_NAME,
651#ifdef CONFIG_PM_SLEEP
652 .pm = &pata_s3c_pm_ops,
653#endif
654 },
655};
656
657module_platform_driver_probe(pata_s3c_driver, pata_s3c_probe);
658
659MODULE_AUTHOR("Abhilash Kesavan, <a.kesavan@samsung.com>");
660MODULE_DESCRIPTION("low-level driver for Samsung PATA controller");
661MODULE_LICENSE("GPL");
662MODULE_VERSION(DRV_VERSION);