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drivers: power: report battery voltage in AOSP compatible format
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / block / mg_disk.c
CommitLineData
3fbed4c6
K		 1/*
2 * drivers/block/mg_disk.c
3 *
4 * Support for the mGine m[g]flash IO mode.
5 * Based on legacy hd.c
6 *
7 * (c) 2008 mGine Co.,LTD
8 * (c) 2008 unsik Kim <donari75@gmail.com>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/fs.h>
18#include <linux/blkdev.h>
19#include <linux/hdreg.h>
8a11a789 20#include <linux/ata.h>
3fbed4c6
K		 21#include <linux/interrupt.h>
22#include <linux/delay.h>
23#include <linux/platform_device.h>
24#include <linux/gpio.h>
5ced504b 25#include <linux/mg_disk.h>
5a0e3ad6 26#include <linux/slab.h>
3fbed4c6
K		 27
28#define MG_RES_SEC (CONFIG_MG_DISK_RES << 1)
29
eec94620
TH		 30/* name for block device */
31#define MG_DISK_NAME "mgd"
eec94620
TH		 32
33#define MG_DISK_MAJ 0
34#define MG_DISK_MAX_PART 16
35#define MG_SECTOR_SIZE 512
36#define MG_MAX_SECTS 256
37
38/* Register offsets */
39#define MG_BUFF_OFFSET 0x8000
eec94620
TH		 40#define MG_REG_OFFSET 0xC000
41#define MG_REG_FEATURE (MG_REG_OFFSET + 2) /* write case */
42#define MG_REG_ERROR (MG_REG_OFFSET + 2) /* read case */
43#define MG_REG_SECT_CNT (MG_REG_OFFSET + 4)
44#define MG_REG_SECT_NUM (MG_REG_OFFSET + 6)
45#define MG_REG_CYL_LOW (MG_REG_OFFSET + 8)
46#define MG_REG_CYL_HIGH (MG_REG_OFFSET + 0xA)
47#define MG_REG_DRV_HEAD (MG_REG_OFFSET + 0xC)
48#define MG_REG_COMMAND (MG_REG_OFFSET + 0xE) /* write case */
49#define MG_REG_STATUS (MG_REG_OFFSET + 0xE) /* read case */
50#define MG_REG_DRV_CTRL (MG_REG_OFFSET + 0x10)
51#define MG_REG_BURST_CTRL (MG_REG_OFFSET + 0x12)
52
eec94620 53/* handy status */
f68adec3
BZ		 54#define MG_STAT_READY (ATA_DRDY | ATA_DSC)
55#define MG_READY_OK(s) (((s) & (MG_STAT_READY | (ATA_BUSY | ATA_DF | \
56 ATA_ERR))) == MG_STAT_READY)
eec94620
TH		 57
58/* error code for others */
59#define MG_ERR_NONE 0
60#define MG_ERR_TIMEOUT 0x100
61#define MG_ERR_INIT_STAT 0x101
62#define MG_ERR_TRANSLATION 0x102
63#define MG_ERR_CTRL_RST 0x103
64#define MG_ERR_INV_STAT 0x104
65#define MG_ERR_RSTOUT 0x105
66
67#define MG_MAX_ERRORS 6 /* Max read/write errors */
68
69/* command */
70#define MG_CMD_RD 0x20
71#define MG_CMD_WR 0x30
72#define MG_CMD_SLEEP 0x99
73#define MG_CMD_WAKEUP 0xC3
74#define MG_CMD_ID 0xEC
75#define MG_CMD_WR_CONF 0x3C
76#define MG_CMD_RD_CONF 0x40
77
78/* operation mode */
79#define MG_OP_CASCADE (1 << 0)
80#define MG_OP_CASCADE_SYNC_RD (1 << 1)
81#define MG_OP_CASCADE_SYNC_WR (1 << 2)
82#define MG_OP_INTERLEAVE (1 << 3)
83
84/* synchronous */
85#define MG_BURST_LAT_4 (3 << 4)
86#define MG_BURST_LAT_5 (4 << 4)
87#define MG_BURST_LAT_6 (5 << 4)
88#define MG_BURST_LAT_7 (6 << 4)
89#define MG_BURST_LAT_8 (7 << 4)
90#define MG_BURST_LEN_4 (1 << 1)
91#define MG_BURST_LEN_8 (2 << 1)
92#define MG_BURST_LEN_16 (3 << 1)
93#define MG_BURST_LEN_32 (4 << 1)
94#define MG_BURST_LEN_CONT (0 << 1)
95
96/* timeout value (unit: ms) */
97#define MG_TMAX_CONF_TO_CMD 1
98#define MG_TMAX_WAIT_RD_DRQ 10
99#define MG_TMAX_WAIT_WR_DRQ 500
100#define MG_TMAX_RST_TO_BUSY 10
101#define MG_TMAX_HDRST_TO_RDY 500
102#define MG_TMAX_SWRST_TO_RDY 500
103#define MG_TMAX_RSTOUT 3000
104
eec94620
TH		 105#define MG_DEV_MASK (MG_BOOT_DEV | MG_STORAGE_DEV | MG_STORAGE_DEV_SKIP_RST)
106
eec94620
TH		 107/* main structure for mflash driver */
108struct mg_host {
109 struct device *dev;
110
111 struct request_queue *breq;
5b36ad60 112 struct request *req;
eec94620
TH		 113 spinlock_t lock;
114 struct gendisk *gd;
115
116 struct timer_list timer;
117 void (*mg_do_intr) (struct mg_host *);
118
119 u16 id[ATA_ID_WORDS];
120
121 u16 cyls;
122 u16 heads;
123 u16 sectors;
124 u32 n_sectors;
125 u32 nres_sectors;
126
127 void __iomem *dev_base;
128 unsigned int irq;
129 unsigned int rst;
130 unsigned int rstout;
131
132 u32 major;
133 u32 error;
134};
135
136/*
137 * Debugging macro and defines
138 */
139#undef DO_MG_DEBUG
140#ifdef DO_MG_DEBUG
141# define MG_DBG(fmt, args...) \
142 printk(KERN_DEBUG "%s:%d "fmt, __func__, __LINE__, ##args)
143#else /* CONFIG_MG_DEBUG */
144# define MG_DBG(fmt, args...) do { } while (0)
145#endif /* CONFIG_MG_DEBUG */
146
3fbed4c6
K		 147static void mg_request(struct request_queue *);
148
5b36ad60
TH		 149static bool mg_end_request(struct mg_host *host, int err, unsigned int nr_bytes)
150{
151 if (__blk_end_request(host->req, err, nr_bytes))
152 return true;
153
154 host->req = NULL;
155 return false;
156}
157
158static bool mg_end_request_cur(struct mg_host *host, int err)
159{
160 return mg_end_request(host, err, blk_rq_cur_bytes(host->req));
161}
162
3fbed4c6
K		 163static void mg_dump_status(const char *msg, unsigned int stat,
164 struct mg_host *host)
165{
166 char *name = MG_DISK_NAME;
3fbed4c6 167
5b36ad60
TH		 168 if (host->req)
169 name = host->req->rq_disk->disk_name;
3fbed4c6
K		 170
171 printk(KERN_ERR "%s: %s: status=0x%02x { ", name, msg, stat & 0xff);
f68adec3 172 if (stat & ATA_BUSY)
3fbed4c6 173 printk("Busy ");
f68adec3 174 if (stat & ATA_DRDY)
3fbed4c6 175 printk("DriveReady ");
f68adec3 176 if (stat & ATA_DF)
3fbed4c6 177 printk("WriteFault ");
f68adec3 178 if (stat & ATA_DSC)
3fbed4c6 179 printk("SeekComplete ");
f68adec3 180 if (stat & ATA_DRQ)
3fbed4c6 181 printk("DataRequest ");
f68adec3 182 if (stat & ATA_CORR)
3fbed4c6 183 printk("CorrectedError ");
f68adec3 184 if (stat & ATA_ERR)
3fbed4c6
K		 185 printk("Error ");
186 printk("}\n");
f68adec3 187 if ((stat & ATA_ERR) == 0) {
3fbed4c6
K		 188 host->error = 0;
189 } else {
190 host->error = inb((unsigned long)host->dev_base + MG_REG_ERROR);
191 printk(KERN_ERR "%s: %s: error=0x%02x { ", name, msg,
192 host->error & 0xff);
f68adec3 193 if (host->error & ATA_BBK)
3fbed4c6 194 printk("BadSector ");
f68adec3 195 if (host->error & ATA_UNC)
3fbed4c6 196 printk("UncorrectableError ");
f68adec3 197 if (host->error & ATA_IDNF)
3fbed4c6 198 printk("SectorIdNotFound ");
f68adec3 199 if (host->error & ATA_ABORTED)
3fbed4c6 200 printk("DriveStatusError ");
f68adec3 201 if (host->error & ATA_AMNF)
3fbed4c6
K		 202 printk("AddrMarkNotFound ");
203 printk("}");
f68adec3 204 if (host->error & (ATA_BBK | ATA_UNC | ATA_IDNF | ATA_AMNF)) {
5b36ad60
TH		 205 if (host->req)
206 printk(", sector=%u",
207 (unsigned int)blk_rq_pos(host->req));
3fbed4c6
K		 208 }
209 printk("\n");
210 }
211}
212
213static unsigned int mg_wait(struct mg_host *host, u32 expect, u32 msec)
214{
215 u8 status;
216 unsigned long expire, cur_jiffies;
217 struct mg_drv_data *prv_data = host->dev->platform_data;
218
219 host->error = MG_ERR_NONE;
220 expire = jiffies + msecs_to_jiffies(msec);
221
eb32baec
K		 222 /* These 2 times dummy status read prevents reading invalid
223 * status. A very little time (3 times of mflash operating clk)
224 * is required for busy bit is set. Use dummy read instead of
225 * busy wait, because mflash's PLL is machine dependent.
226 */
227 if (prv_data->use_polling) {
228 status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
229 status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
230 }
231
3fbed4c6
K		 232 status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
233
234 do {
235 cur_jiffies = jiffies;
f68adec3
BZ		 236 if (status & ATA_BUSY) {
237 if (expect == ATA_BUSY)
3fbed4c6
K		 238 break;
239 } else {
240 /* Check the error condition! */
f68adec3 241 if (status & ATA_ERR) {
3fbed4c6
K		 242 mg_dump_status("mg_wait", status, host);
243 break;
244 }
245
246 if (expect == MG_STAT_READY)
247 if (MG_READY_OK(status))
248 break;
249
f68adec3
BZ		 250 if (expect == ATA_DRQ)
251 if (status & ATA_DRQ)
3fbed4c6
K		 252 break;
253 }
254 if (!msec) {
255 mg_dump_status("not ready", status, host);
256 return MG_ERR_INV_STAT;
257 }
3fbed4c6
K		 258
259 status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
260 } while (time_before(cur_jiffies, expire));
261
262 if (time_after_eq(cur_jiffies, expire) && msec)
263 host->error = MG_ERR_TIMEOUT;
264
265 return host->error;
266}
267
268static unsigned int mg_wait_rstout(u32 rstout, u32 msec)
269{
270 unsigned long expire;
271
272 expire = jiffies + msecs_to_jiffies(msec);
273 while (time_before(jiffies, expire)) {
274 if (gpio_get_value(rstout) == 1)
275 return MG_ERR_NONE;
276 msleep(10);
277 }
278
279 return MG_ERR_RSTOUT;
280}
281
282static void mg_unexpected_intr(struct mg_host *host)
283{
284 u32 status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
285
286 mg_dump_status("mg_unexpected_intr", status, host);
287}
288
289static irqreturn_t mg_irq(int irq, void *dev_id)
290{
291 struct mg_host *host = dev_id;
292 void (*handler)(struct mg_host *) = host->mg_do_intr;
293
ac2ff946
TH		 294 spin_lock(&host->lock);
295
296 host->mg_do_intr = NULL;
3fbed4c6
K		 297 del_timer(&host->timer);
298 if (!handler)
299 handler = mg_unexpected_intr;
300 handler(host);
ac2ff946
TH		 301
302 spin_unlock(&host->lock);
303
3fbed4c6
K		 304 return IRQ_HANDLED;
305}
306
8a11a789
BZ		 307/* local copy of ata_id_string() */
308static void mg_id_string(const u16 *id, unsigned char *s,
309 unsigned int ofs, unsigned int len)
310{
311 unsigned int c;
312
313 BUG_ON(len & 1);
314
315 while (len > 0) {
316 c = id[ofs] >> 8;
317 *s = c;
318 s++;
319
320 c = id[ofs] & 0xff;
321 *s = c;
322 s++;
323
324 ofs++;
325 len -= 2;
326 }
327}
328
329/* local copy of ata_id_c_string() */
330static void mg_id_c_string(const u16 *id, unsigned char *s,
331 unsigned int ofs, unsigned int len)
332{
333 unsigned char *p;
334
335 mg_id_string(id, s, ofs, len - 1);
336
337 p = s + strnlen(s, len - 1);
338 while (p > s && p[-1] == ' ')
339 p--;
340 *p = '\0';
341}
342
3fbed4c6
K		 343static int mg_get_disk_id(struct mg_host *host)
344{
345 u32 i;
346 s32 err;
347 const u16 *id = host->id;
348 struct mg_drv_data *prv_data = host->dev->platform_data;
349 char fwrev[ATA_ID_FW_REV_LEN + 1];
350 char model[ATA_ID_PROD_LEN + 1];
351 char serial[ATA_ID_SERNO_LEN + 1];
352
353 if (!prv_data->use_polling)
f68adec3 354 outb(ATA_NIEN, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
3fbed4c6
K		 355
356 outb(MG_CMD_ID, (unsigned long)host->dev_base + MG_REG_COMMAND);
f68adec3 357 err = mg_wait(host, ATA_DRQ, MG_TMAX_WAIT_RD_DRQ);
3fbed4c6
K		 358 if (err)
359 return err;
360
361 for (i = 0; i < (MG_SECTOR_SIZE >> 1); i++)
362 host->id[i] = le16_to_cpu(inw((unsigned long)host->dev_base +
363 MG_BUFF_OFFSET + i * 2));
364
365 outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND);
366 err = mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD);
367 if (err)
368 return err;
369
370 if ((id[ATA_ID_FIELD_VALID] & 1) == 0)
371 return MG_ERR_TRANSLATION;
372
373 host->n_sectors = ata_id_u32(id, ATA_ID_LBA_CAPACITY);
374 host->cyls = id[ATA_ID_CYLS];
375 host->heads = id[ATA_ID_HEADS];
376 host->sectors = id[ATA_ID_SECTORS];
377
378 if (MG_RES_SEC && host->heads && host->sectors) {
379 /* modify cyls, n_sectors */
380 host->cyls = (host->n_sectors - MG_RES_SEC) /
381 host->heads / host->sectors;
382 host->nres_sectors = host->n_sectors - host->cyls *
383 host->heads * host->sectors;
384 host->n_sectors -= host->nres_sectors;
385 }
386
8a11a789
BZ		 387 mg_id_c_string(id, fwrev, ATA_ID_FW_REV, sizeof(fwrev));
388 mg_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
389 mg_id_c_string(id, serial, ATA_ID_SERNO, sizeof(serial));
3fbed4c6
K		 390 printk(KERN_INFO "mg_disk: model: %s\n", model);
391 printk(KERN_INFO "mg_disk: firm: %.8s\n", fwrev);
392 printk(KERN_INFO "mg_disk: serial: %s\n", serial);
393 printk(KERN_INFO "mg_disk: %d + reserved %d sectors\n",
394 host->n_sectors, host->nres_sectors);
395
396 if (!prv_data->use_polling)
f68adec3 397 outb(0, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
3fbed4c6
K		 398
399 return err;
400}
401
402
403static int mg_disk_init(struct mg_host *host)
404{
405 struct mg_drv_data *prv_data = host->dev->platform_data;
406 s32 err;
407 u8 init_status;
408
409 /* hdd rst low */
410 gpio_set_value(host->rst, 0);
f68adec3 411 err = mg_wait(host, ATA_BUSY, MG_TMAX_RST_TO_BUSY);
3fbed4c6
K		 412 if (err)
413 return err;
414
415 /* hdd rst high */
416 gpio_set_value(host->rst, 1);
417 err = mg_wait(host, MG_STAT_READY, MG_TMAX_HDRST_TO_RDY);
418 if (err)
419 return err;
420
421 /* soft reset on */
f68adec3 422 outb(ATA_SRST | (prv_data->use_polling ? ATA_NIEN : 0),
3fbed4c6 423 (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
f68adec3 424 err = mg_wait(host, ATA_BUSY, MG_TMAX_RST_TO_BUSY);
3fbed4c6
K		 425 if (err)
426 return err;
427
428 /* soft reset off */
f68adec3 429 outb(prv_data->use_polling ? ATA_NIEN : 0,
3fbed4c6
K		 430 (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
431 err = mg_wait(host, MG_STAT_READY, MG_TMAX_SWRST_TO_RDY);
432 if (err)
433 return err;
434
435 init_status = inb((unsigned long)host->dev_base + MG_REG_STATUS) & 0xf;
436
437 if (init_status == 0xf)
438 return MG_ERR_INIT_STAT;
439
440 return err;
441}
442
443static void mg_bad_rw_intr(struct mg_host *host)
444{
5b36ad60
TH		 445 if (host->req)
446 if (++host->req->errors >= MG_MAX_ERRORS ||
447 host->error == MG_ERR_TIMEOUT)
448 mg_end_request_cur(host, -EIO);
3fbed4c6
K		 449}
450
451static unsigned int mg_out(struct mg_host *host,
452 unsigned int sect_num,
453 unsigned int sect_cnt,
454 unsigned int cmd,
455 void (*intr_addr)(struct mg_host *))
456{
457 struct mg_drv_data *prv_data = host->dev->platform_data;
458
459 if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
460 return host->error;
461
462 if (!prv_data->use_polling) {
463 host->mg_do_intr = intr_addr;
464 mod_timer(&host->timer, jiffies + 3 * HZ);
465 }
466 if (MG_RES_SEC)
467 sect_num += MG_RES_SEC;
468 outb((u8)sect_cnt, (unsigned long)host->dev_base + MG_REG_SECT_CNT);
469 outb((u8)sect_num, (unsigned long)host->dev_base + MG_REG_SECT_NUM);
470 outb((u8)(sect_num >> 8), (unsigned long)host->dev_base +
471 MG_REG_CYL_LOW);
472 outb((u8)(sect_num >> 16), (unsigned long)host->dev_base +
473 MG_REG_CYL_HIGH);
f68adec3 474 outb((u8)((sect_num >> 24) | ATA_LBA | ATA_DEVICE_OBS),
3fbed4c6
K		 475 (unsigned long)host->dev_base + MG_REG_DRV_HEAD);
476 outb(cmd, (unsigned long)host->dev_base + MG_REG_COMMAND);
477 return MG_ERR_NONE;
478}
479
394c6cc6
BZ		 480static void mg_read_one(struct mg_host *host, struct request *req)
481{
482 u16 *buff = (u16 *)req->buffer;
483 u32 i;
484
485 for (i = 0; i < MG_SECTOR_SIZE >> 1; i++)
486 *buff++ = inw((unsigned long)host->dev_base + MG_BUFF_OFFSET +
487 (i << 1));
488}
489
3fbed4c6
K		 490static void mg_read(struct request *req)
491{
3fbed4c6
K		 492 struct mg_host *host = req->rq_disk->private_data;
493
83096ebf
TH		 494 if (mg_out(host, blk_rq_pos(req), blk_rq_sectors(req),
495 MG_CMD_RD, NULL) != MG_ERR_NONE)
3fbed4c6
K		 496 mg_bad_rw_intr(host);
497
498 MG_DBG("requested %d sects (from %ld), buffer=0x%p\n",
83096ebf 499 blk_rq_sectors(req), blk_rq_pos(req), req->buffer);
a03bb5a3
TH		 500
501 do {
f68adec3
BZ		 502 if (mg_wait(host, ATA_DRQ,
503 MG_TMAX_WAIT_RD_DRQ) != MG_ERR_NONE) {
3fbed4c6
K		 504 mg_bad_rw_intr(host);
505 return;
506 }
394c6cc6
BZ		 507
508 mg_read_one(host, req);
3fbed4c6
K		 509
510 outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base +
511 MG_REG_COMMAND);
5b36ad60 512 } while (mg_end_request(host, 0, MG_SECTOR_SIZE));
3fbed4c6
K		 513}
514
394c6cc6
BZ		 515static void mg_write_one(struct mg_host *host, struct request *req)
516{
517 u16 *buff = (u16 *)req->buffer;
518 u32 i;
519
520 for (i = 0; i < MG_SECTOR_SIZE >> 1; i++)
521 outw(*buff++, (unsigned long)host->dev_base + MG_BUFF_OFFSET +
522 (i << 1));
523}
524
3fbed4c6
K		 525static void mg_write(struct request *req)
526{
3fbed4c6 527 struct mg_host *host = req->rq_disk->private_data;
a85a00a6 528 unsigned int rem = blk_rq_sectors(req);
3fbed4c6 529
a85a00a6 530 if (mg_out(host, blk_rq_pos(req), rem,
83096ebf 531 MG_CMD_WR, NULL) != MG_ERR_NONE) {
3fbed4c6
K		 532 mg_bad_rw_intr(host);
533 return;
534 }
535
3fbed4c6 536 MG_DBG("requested %d sects (from %ld), buffer=0x%p\n",
a85a00a6 537 rem, blk_rq_pos(req), req->buffer);
a03bb5a3 538
394c6cc6
BZ		 539 if (mg_wait(host, ATA_DRQ,
540 MG_TMAX_WAIT_WR_DRQ) != MG_ERR_NONE) {
541 mg_bad_rw_intr(host);
542 return;
543 }
544
a85a00a6
K		 545 do {
546 mg_write_one(host, req);
394c6cc6 547
a85a00a6
K		 548 outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base +
549 MG_REG_COMMAND);
a03bb5a3 550
a85a00a6
K		 551 rem--;
552 if (rem > 1 && mg_wait(host, ATA_DRQ,
553 MG_TMAX_WAIT_WR_DRQ) != MG_ERR_NONE) {
554 mg_bad_rw_intr(host);
555 return;
556 } else if (mg_wait(host, MG_STAT_READY,
557 MG_TMAX_WAIT_WR_DRQ) != MG_ERR_NONE) {
3fbed4c6
K		 558 mg_bad_rw_intr(host);
559 return;
560 }
a85a00a6 561 } while (mg_end_request(host, 0, MG_SECTOR_SIZE));
3fbed4c6
K		 562}
563
564static void mg_read_intr(struct mg_host *host)
565{
5b36ad60 566 struct request *req = host->req;
3fbed4c6 567 u32 i;
3fbed4c6
K		 568
569 /* check status */
570 do {
571 i = inb((unsigned long)host->dev_base + MG_REG_STATUS);
f68adec3 572 if (i & ATA_BUSY)
3fbed4c6
K		 573 break;
574 if (!MG_READY_OK(i))
575 break;
f68adec3 576 if (i & ATA_DRQ)
3fbed4c6
K		 577 goto ok_to_read;
578 } while (0);
579 mg_dump_status("mg_read_intr", i, host);
580 mg_bad_rw_intr(host);
581 mg_request(host->breq);
582 return;
583
584ok_to_read:
394c6cc6 585 mg_read_one(host, req);
3fbed4c6 586
3fbed4c6 587 MG_DBG("sector %ld, remaining=%ld, buffer=0x%p\n",
83096ebf 588 blk_rq_pos(req), blk_rq_sectors(req) - 1, req->buffer);
3fbed4c6 589
3fbed4c6
K		 590 /* send read confirm */
591 outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND);
592
5b36ad60 593 if (mg_end_request(host, 0, MG_SECTOR_SIZE)) {
a03bb5a3
TH		 594 /* set handler if read remains */
595 host->mg_do_intr = mg_read_intr;
596 mod_timer(&host->timer, jiffies + 3 * HZ);
597 } else /* goto next request */
3fbed4c6
K		 598 mg_request(host->breq);
599}
600
601static void mg_write_intr(struct mg_host *host)
602{
5b36ad60 603 struct request *req = host->req;
394c6cc6 604 u32 i;
a03bb5a3 605 bool rem;
3fbed4c6 606
3fbed4c6
K		 607 /* check status */
608 do {
609 i = inb((unsigned long)host->dev_base + MG_REG_STATUS);
f68adec3 610 if (i & ATA_BUSY)
3fbed4c6
K		 611 break;
612 if (!MG_READY_OK(i))
613 break;
83096ebf 614 if ((blk_rq_sectors(req) <= 1) || (i & ATA_DRQ))
3fbed4c6
K		 615 goto ok_to_write;
616 } while (0);
617 mg_dump_status("mg_write_intr", i, host);
618 mg_bad_rw_intr(host);
619 mg_request(host->breq);
620 return;
621
622ok_to_write:
5b36ad60 623 if ((rem = mg_end_request(host, 0, MG_SECTOR_SIZE))) {
a03bb5a3 624 /* write 1 sector and set handler if remains */
394c6cc6 625 mg_write_one(host, req);
3fbed4c6 626 MG_DBG("sector %ld, remaining=%ld, buffer=0x%p\n",
83096ebf 627 blk_rq_pos(req), blk_rq_sectors(req), req->buffer);
3fbed4c6
K		 628 host->mg_do_intr = mg_write_intr;
629 mod_timer(&host->timer, jiffies + 3 * HZ);
630 }
631
632 /* send write confirm */
633 outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND);
634
a03bb5a3 635 if (!rem)
3fbed4c6
K		 636 mg_request(host->breq);
637}
638
639void mg_times_out(unsigned long data)
640{
641 struct mg_host *host = (struct mg_host *)data;
642 char *name;
3fbed4c6 643
ac2ff946
TH		 644 spin_lock_irq(&host->lock);
645
5b36ad60 646 if (!host->req)
ac2ff946 647 goto out_unlock;
3fbed4c6
K		 648
649 host->mg_do_intr = NULL;
650
5b36ad60 651 name = host->req->rq_disk->disk_name;
3fbed4c6
K		 652 printk(KERN_DEBUG "%s: timeout\n", name);
653
654 host->error = MG_ERR_TIMEOUT;
655 mg_bad_rw_intr(host);
656
ac2ff946 657out_unlock:
5b36ad60 658 mg_request(host->breq);
ac2ff946 659 spin_unlock_irq(&host->lock);
3fbed4c6
K		 660}
661
662static void mg_request_poll(struct request_queue *q)
663{
5b36ad60 664 struct mg_host *host = q->queuedata;
3fbed4c6 665
5b36ad60
TH		 666 while (1) {
667 if (!host->req) {
9934c8c0
TH		 668 host->req = blk_fetch_request(q);
669 if (!host->req)
5b36ad60
TH		 670 break;
671 }
9a8d23d8 672
33659ebb 673 if (unlikely(host->req->cmd_type != REQ_TYPE_FS)) {
5b36ad60 674 mg_end_request_cur(host, -EIO);
9a8d23d8 675 continue;
3fbed4c6 676 }
9a8d23d8 677
5b36ad60
TH		 678 if (rq_data_dir(host->req) == READ)
679 mg_read(host->req);
9a8d23d8 680 else
5b36ad60 681 mg_write(host->req);
3fbed4c6
K		 682 }
683}
684
685static unsigned int mg_issue_req(struct request *req,
686 struct mg_host *host,
687 unsigned int sect_num,
688 unsigned int sect_cnt)
689{
3fbed4c6
K		 690 switch (rq_data_dir(req)) {
691 case READ:
692 if (mg_out(host, sect_num, sect_cnt, MG_CMD_RD, &mg_read_intr)
693 != MG_ERR_NONE) {
694 mg_bad_rw_intr(host);
695 return host->error;
696 }
697 break;
698 case WRITE:
699 /* TODO : handler */
f68adec3 700 outb(ATA_NIEN, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
3fbed4c6
K		 701 if (mg_out(host, sect_num, sect_cnt, MG_CMD_WR, &mg_write_intr)
702 != MG_ERR_NONE) {
703 mg_bad_rw_intr(host);
704 return host->error;
705 }
706 del_timer(&host->timer);
f68adec3
BZ		 707 mg_wait(host, ATA_DRQ, MG_TMAX_WAIT_WR_DRQ);
708 outb(0, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
3fbed4c6
K		 709 if (host->error) {
710 mg_bad_rw_intr(host);
711 return host->error;
712 }
394c6cc6 713 mg_write_one(host, req);
3fbed4c6
K		 714 mod_timer(&host->timer, jiffies + 3 * HZ);
715 outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base +
716 MG_REG_COMMAND);
717 break;
3fbed4c6
K		 718 }
719 return MG_ERR_NONE;
720}
721
722/* This function also called from IRQ context */
723static void mg_request(struct request_queue *q)
724{
5b36ad60 725 struct mg_host *host = q->queuedata;
3fbed4c6 726 struct request *req;
3fbed4c6
K		 727 u32 sect_num, sect_cnt;
728
729 while (1) {
5b36ad60 730 if (!host->req) {
9934c8c0
TH		 731 host->req = blk_fetch_request(q);
732 if (!host->req)
5b36ad60
TH		 733 break;
734 }
735 req = host->req;
3fbed4c6
K		 736
737 /* check unwanted request call */
738 if (host->mg_do_intr)
739 return;
740
741 del_timer(&host->timer);
742
83096ebf 743 sect_num = blk_rq_pos(req);
3fbed4c6 744 /* deal whole segments */
83096ebf 745 sect_cnt = blk_rq_sectors(req);
3fbed4c6
K		 746
747 /* sanity check */
748 if (sect_num >= get_capacity(req->rq_disk) ||
749 ((sect_num + sect_cnt) >
750 get_capacity(req->rq_disk))) {
751 printk(KERN_WARNING
752 "%s: bad access: sector=%d, count=%d\n",
753 req->rq_disk->disk_name,
754 sect_num, sect_cnt);
5b36ad60 755 mg_end_request_cur(host, -EIO);
3fbed4c6
K		 756 continue;
757 }
758
33659ebb 759 if (unlikely(req->cmd_type != REQ_TYPE_FS)) {
5b36ad60 760 mg_end_request_cur(host, -EIO);
9a8d23d8
TH		 761 continue;
762 }
3fbed4c6
K		 763
764 if (!mg_issue_req(req, host, sect_num, sect_cnt))
765 return;
766 }
767}
768
769static int mg_getgeo(struct block_device *bdev, struct hd_geometry *geo)
770{
771 struct mg_host *host = bdev->bd_disk->private_data;
772
773 geo->cylinders = (unsigned short)host->cyls;
774 geo->heads = (unsigned char)host->heads;
775 geo->sectors = (unsigned char)host->sectors;
776 return 0;
777}
778
83d5cde4 779static const struct block_device_operations mg_disk_ops = {
3fbed4c6
K		 780 .getgeo = mg_getgeo
781};
782
aed3d67e 783#ifdef CONFIG_PM_SLEEP
156ffcb4 784static int mg_suspend(struct device *dev)
3fbed4c6 785{
156ffcb4 786 struct mg_drv_data *prv_data = dev->platform_data;
3fbed4c6
K		 787 struct mg_host *host = prv_data->host;
788
789 if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
790 return -EIO;
791
792 if (!prv_data->use_polling)
f68adec3 793 outb(ATA_NIEN, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
3fbed4c6
K		 794
795 outb(MG_CMD_SLEEP, (unsigned long)host->dev_base + MG_REG_COMMAND);
796 /* wait until mflash deep sleep */
797 msleep(1);
798
799 if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD)) {
800 if (!prv_data->use_polling)
f68adec3 801 outb(0, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
3fbed4c6
K		 802 return -EIO;
803 }
804
805 return 0;
806}
807
156ffcb4 808static int mg_resume(struct device *dev)
3fbed4c6 809{
156ffcb4 810 struct mg_drv_data *prv_data = dev->platform_data;
3fbed4c6
K		 811 struct mg_host *host = prv_data->host;
812
813 if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
814 return -EIO;
815
816 outb(MG_CMD_WAKEUP, (unsigned long)host->dev_base + MG_REG_COMMAND);
817 /* wait until mflash wakeup */
818 msleep(1);
819
820 if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
821 return -EIO;
822
823 if (!prv_data->use_polling)
f68adec3 824 outb(0, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
3fbed4c6
K		 825
826 return 0;
827}
aed3d67e 828#endif
3fbed4c6 829
156ffcb4
RW		 830static SIMPLE_DEV_PM_OPS(mg_pm, mg_suspend, mg_resume);
831
3fbed4c6
K		 832static int mg_probe(struct platform_device *plat_dev)
833{
834 struct mg_host *host;
835 struct resource *rsc;
836 struct mg_drv_data *prv_data = plat_dev->dev.platform_data;
837 int err = 0;
838
839 if (!prv_data) {
840 printk(KERN_ERR "%s:%d fail (no driver_data)\n",
841 __func__, __LINE__);
842 err = -EINVAL;
843 goto probe_err;
844 }
845
846 /* alloc mg_host */
847 host = kzalloc(sizeof(struct mg_host), GFP_KERNEL);
848 if (!host) {
849 printk(KERN_ERR "%s:%d fail (no memory for mg_host)\n",
850 __func__, __LINE__);
851 err = -ENOMEM;
852 goto probe_err;
853 }
854 host->major = MG_DISK_MAJ;
855
856 /* link each other */
857 prv_data->host = host;
858 host->dev = &plat_dev->dev;
859
860 /* io remap */
861 rsc = platform_get_resource(plat_dev, IORESOURCE_MEM, 0);
862 if (!rsc) {
863 printk(KERN_ERR "%s:%d platform_get_resource fail\n",
864 __func__, __LINE__);
865 err = -EINVAL;
866 goto probe_err_2;
867 }
e019ef0c 868 host->dev_base = ioremap(rsc->start, resource_size(rsc));
3fbed4c6
K		 869 if (!host->dev_base) {
870 printk(KERN_ERR "%s:%d ioremap fail\n",
871 __func__, __LINE__);
872 err = -EIO;
873 goto probe_err_2;
874 }
875 MG_DBG("dev_base = 0x%x\n", (u32)host->dev_base);
876
877 /* get reset pin */
878 rsc = platform_get_resource_byname(plat_dev, IORESOURCE_IO,
879 MG_RST_PIN);
880 if (!rsc) {
881 printk(KERN_ERR "%s:%d get reset pin fail\n",
882 __func__, __LINE__);
883 err = -EIO;
884 goto probe_err_3;
885 }
886 host->rst = rsc->start;
887
888 /* init rst pin */
889 err = gpio_request(host->rst, MG_RST_PIN);
890 if (err)
891 goto probe_err_3;
892 gpio_direction_output(host->rst, 1);
893
894 /* reset out pin */
c613c5f6
WY		 895 if (!(prv_data->dev_attr & MG_DEV_MASK)) {
896 err = -EINVAL;
3fbed4c6 897 goto probe_err_3a;
c613c5f6 898 }
3fbed4c6
K		 899
900 if (prv_data->dev_attr != MG_BOOT_DEV) {
901 rsc = platform_get_resource_byname(plat_dev, IORESOURCE_IO,
902 MG_RSTOUT_PIN);
903 if (!rsc) {
904 printk(KERN_ERR "%s:%d get reset-out pin fail\n",
905 __func__, __LINE__);
906 err = -EIO;
907 goto probe_err_3a;
908 }
909 host->rstout = rsc->start;
910 err = gpio_request(host->rstout, MG_RSTOUT_PIN);
911 if (err)
912 goto probe_err_3a;
913 gpio_direction_input(host->rstout);
914 }
915
916 /* disk reset */
917 if (prv_data->dev_attr == MG_STORAGE_DEV) {
918 /* If POR seq. not yet finised, wait */
919 err = mg_wait_rstout(host->rstout, MG_TMAX_RSTOUT);
920 if (err)
921 goto probe_err_3b;
922 err = mg_disk_init(host);
923 if (err) {
924 printk(KERN_ERR "%s:%d fail (err code : %d)\n",
925 __func__, __LINE__, err);
926 err = -EIO;
927 goto probe_err_3b;
928 }
929 }
930
931 /* get irq resource */
932 if (!prv_data->use_polling) {
933 host->irq = platform_get_irq(plat_dev, 0);
934 if (host->irq == -ENXIO) {
935 err = host->irq;
936 goto probe_err_3b;
937 }
938 err = request_irq(host->irq, mg_irq,
939 IRQF_DISABLED | IRQF_TRIGGER_RISING,
940 MG_DEV_NAME, host);
941 if (err) {
942 printk(KERN_ERR "%s:%d fail (request_irq err=%d)\n",
943 __func__, __LINE__, err);
944 goto probe_err_3b;
945 }
946
947 }
948
949 /* get disk id */
950 err = mg_get_disk_id(host);
951 if (err) {
952 printk(KERN_ERR "%s:%d fail (err code : %d)\n",
953 __func__, __LINE__, err);
954 err = -EIO;
955 goto probe_err_4;
956 }
957
958 err = register_blkdev(host->major, MG_DISK_NAME);
959 if (err < 0) {
960 printk(KERN_ERR "%s:%d register_blkdev fail (err code : %d)\n",
961 __func__, __LINE__, err);
962 goto probe_err_4;
963 }
964 if (!host->major)
965 host->major = err;
966
967 spin_lock_init(&host->lock);
968
969 if (prv_data->use_polling)
970 host->breq = blk_init_queue(mg_request_poll, &host->lock);
971 else
972 host->breq = blk_init_queue(mg_request, &host->lock);
973
974 if (!host->breq) {
975 err = -ENOMEM;
976 printk(KERN_ERR "%s:%d (blk_init_queue) fail\n",
977 __func__, __LINE__);
978 goto probe_err_5;
979 }
5b36ad60 980 host->breq->queuedata = host;
3fbed4c6
K		 981
982 /* mflash is random device, thanx for the noop */
52cc2eef 983 err = elevator_change(host->breq, "noop");
3fbed4c6
K		 984 if (err) {
985 printk(KERN_ERR "%s:%d (elevator_init) fail\n",
986 __func__, __LINE__);
987 goto probe_err_6;
988 }
086fa5ff 989 blk_queue_max_hw_sectors(host->breq, MG_MAX_SECTS);
e1defc4f 990 blk_queue_logical_block_size(host->breq, MG_SECTOR_SIZE);
3fbed4c6
K		 991
992 init_timer(&host->timer);
993 host->timer.function = mg_times_out;
994 host->timer.data = (unsigned long)host;
995
996 host->gd = alloc_disk(MG_DISK_MAX_PART);
997 if (!host->gd) {
998 printk(KERN_ERR "%s:%d (alloc_disk) fail\n",
999 __func__, __LINE__);
1000 err = -ENOMEM;
1001 goto probe_err_7;
1002 }
1003 host->gd->major = host->major;
1004 host->gd->first_minor = 0;
1005 host->gd->fops = &mg_disk_ops;
1006 host->gd->queue = host->breq;
1007 host->gd->private_data = host;
1008 sprintf(host->gd->disk_name, MG_DISK_NAME"a");
1009
1010 set_capacity(host->gd, host->n_sectors);
1011
1012 add_disk(host->gd);
1013
1014 return err;
1015
1016probe_err_7:
1017 del_timer_sync(&host->timer);
1018probe_err_6:
1019 blk_cleanup_queue(host->breq);
1020probe_err_5:
1021 unregister_blkdev(MG_DISK_MAJ, MG_DISK_NAME);
1022probe_err_4:
1023 if (!prv_data->use_polling)
1024 free_irq(host->irq, host);
1025probe_err_3b:
1026 gpio_free(host->rstout);
1027probe_err_3a:
1028 gpio_free(host->rst);
1029probe_err_3:
1030 iounmap(host->dev_base);
1031probe_err_2:
1032 kfree(host);
1033probe_err:
1034 return err;
1035}
1036
1037static int mg_remove(struct platform_device *plat_dev)
1038{
1039 struct mg_drv_data *prv_data = plat_dev->dev.platform_data;
1040 struct mg_host *host = prv_data->host;
1041 int err = 0;
1042
1043 /* delete timer */
1044 del_timer_sync(&host->timer);
1045
1046 /* remove disk */
1047 if (host->gd) {
1048 del_gendisk(host->gd);
1049 put_disk(host->gd);
1050 }
1051 /* remove queue */
1052 if (host->breq)
1053 blk_cleanup_queue(host->breq);
1054
1055 /* unregister blk device */
1056 unregister_blkdev(host->major, MG_DISK_NAME);
1057
1058 /* free irq */
1059 if (!prv_data->use_polling)
1060 free_irq(host->irq, host);
1061
1062 /* free reset-out pin */
1063 if (prv_data->dev_attr != MG_BOOT_DEV)
1064 gpio_free(host->rstout);
1065
1066 /* free rst pin */
1067 if (host->rst)
1068 gpio_free(host->rst);
1069
1070 /* unmap io */
1071 if (host->dev_base)
1072 iounmap(host->dev_base);
1073
1074 /* free mg_host */
1075 kfree(host);
1076
1077 return err;
1078}
1079
1080static struct platform_driver mg_disk_driver = {
1081 .probe = mg_probe,
1082 .remove = mg_remove,
3fbed4c6
K		 1083 .driver = {
1084 .name = MG_DEV_NAME,
1085 .owner = THIS_MODULE,
156ffcb4 1086 .pm = &mg_pm,
3fbed4c6
K		 1087 }
1088};
1089
1090/****************************************************************************
1091 *
1092 * Module stuff
1093 *
1094 ****************************************************************************/
1095
1096static int __init mg_init(void)
1097{
1098 printk(KERN_INFO "mGine mflash driver, (c) 2008 mGine Co.\n");
1099 return platform_driver_register(&mg_disk_driver);
1100}
1101
1102static void __exit mg_exit(void)
1103{
1104 printk(KERN_INFO "mflash driver : bye bye\n");
1105 platform_driver_unregister(&mg_disk_driver);
1106}
1107
1108module_init(mg_init);
1109module_exit(mg_exit);
1110
1111MODULE_LICENSE("GPL");
1112MODULE_AUTHOR("unsik Kim <donari75@gmail.com>");
1113MODULE_DESCRIPTION("mGine m[g]flash device driver");
kernel source for telekom puls (alcatel/mediatek)