Commit | Line | Data |
---|---|---|
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> | |
20 | #include <linux/libata.h> | |
21 | #include <linux/interrupt.h> | |
22 | #include <linux/delay.h> | |
23 | #include <linux/platform_device.h> | |
24 | #include <linux/gpio.h> | |
25 | #include <linux/mg_disk.h> | |
26 | ||
27 | #define MG_RES_SEC (CONFIG_MG_DISK_RES << 1) | |
28 | ||
29 | static void mg_request(struct request_queue *); | |
30 | ||
31 | static void mg_dump_status(const char *msg, unsigned int stat, | |
32 | struct mg_host *host) | |
33 | { | |
34 | char *name = MG_DISK_NAME; | |
35 | struct request *req; | |
36 | ||
37 | if (host->breq) { | |
38 | req = elv_next_request(host->breq); | |
39 | if (req) | |
40 | name = req->rq_disk->disk_name; | |
41 | } | |
42 | ||
43 | printk(KERN_ERR "%s: %s: status=0x%02x { ", name, msg, stat & 0xff); | |
44 | if (stat & MG_REG_STATUS_BIT_BUSY) | |
45 | printk("Busy "); | |
46 | if (stat & MG_REG_STATUS_BIT_READY) | |
47 | printk("DriveReady "); | |
48 | if (stat & MG_REG_STATUS_BIT_WRITE_FAULT) | |
49 | printk("WriteFault "); | |
50 | if (stat & MG_REG_STATUS_BIT_SEEK_DONE) | |
51 | printk("SeekComplete "); | |
52 | if (stat & MG_REG_STATUS_BIT_DATA_REQ) | |
53 | printk("DataRequest "); | |
54 | if (stat & MG_REG_STATUS_BIT_CORRECTED_ERROR) | |
55 | printk("CorrectedError "); | |
56 | if (stat & MG_REG_STATUS_BIT_ERROR) | |
57 | printk("Error "); | |
58 | printk("}\n"); | |
59 | if ((stat & MG_REG_STATUS_BIT_ERROR) == 0) { | |
60 | host->error = 0; | |
61 | } else { | |
62 | host->error = inb((unsigned long)host->dev_base + MG_REG_ERROR); | |
63 | printk(KERN_ERR "%s: %s: error=0x%02x { ", name, msg, | |
64 | host->error & 0xff); | |
65 | if (host->error & MG_REG_ERR_BBK) | |
66 | printk("BadSector "); | |
67 | if (host->error & MG_REG_ERR_UNC) | |
68 | printk("UncorrectableError "); | |
69 | if (host->error & MG_REG_ERR_IDNF) | |
70 | printk("SectorIdNotFound "); | |
71 | if (host->error & MG_REG_ERR_ABRT) | |
72 | printk("DriveStatusError "); | |
73 | if (host->error & MG_REG_ERR_AMNF) | |
74 | printk("AddrMarkNotFound "); | |
75 | printk("}"); | |
76 | if (host->error & | |
77 | (MG_REG_ERR_BBK | MG_REG_ERR_UNC | | |
78 | MG_REG_ERR_IDNF | MG_REG_ERR_AMNF)) { | |
79 | if (host->breq) { | |
80 | req = elv_next_request(host->breq); | |
81 | if (req) | |
0d9f346f | 82 | printk(", sector=%u", (u32)req->sector); |
3fbed4c6 K |
83 | } |
84 | ||
85 | } | |
86 | printk("\n"); | |
87 | } | |
88 | } | |
89 | ||
90 | static unsigned int mg_wait(struct mg_host *host, u32 expect, u32 msec) | |
91 | { | |
92 | u8 status; | |
93 | unsigned long expire, cur_jiffies; | |
94 | struct mg_drv_data *prv_data = host->dev->platform_data; | |
95 | ||
96 | host->error = MG_ERR_NONE; | |
97 | expire = jiffies + msecs_to_jiffies(msec); | |
98 | ||
99 | status = inb((unsigned long)host->dev_base + MG_REG_STATUS); | |
100 | ||
101 | do { | |
102 | cur_jiffies = jiffies; | |
103 | if (status & MG_REG_STATUS_BIT_BUSY) { | |
104 | if (expect == MG_REG_STATUS_BIT_BUSY) | |
105 | break; | |
106 | } else { | |
107 | /* Check the error condition! */ | |
108 | if (status & MG_REG_STATUS_BIT_ERROR) { | |
109 | mg_dump_status("mg_wait", status, host); | |
110 | break; | |
111 | } | |
112 | ||
113 | if (expect == MG_STAT_READY) | |
114 | if (MG_READY_OK(status)) | |
115 | break; | |
116 | ||
117 | if (expect == MG_REG_STATUS_BIT_DATA_REQ) | |
118 | if (status & MG_REG_STATUS_BIT_DATA_REQ) | |
119 | break; | |
120 | } | |
121 | if (!msec) { | |
122 | mg_dump_status("not ready", status, host); | |
123 | return MG_ERR_INV_STAT; | |
124 | } | |
125 | if (prv_data->use_polling) | |
126 | msleep(1); | |
127 | ||
128 | status = inb((unsigned long)host->dev_base + MG_REG_STATUS); | |
129 | } while (time_before(cur_jiffies, expire)); | |
130 | ||
131 | if (time_after_eq(cur_jiffies, expire) && msec) | |
132 | host->error = MG_ERR_TIMEOUT; | |
133 | ||
134 | return host->error; | |
135 | } | |
136 | ||
137 | static unsigned int mg_wait_rstout(u32 rstout, u32 msec) | |
138 | { | |
139 | unsigned long expire; | |
140 | ||
141 | expire = jiffies + msecs_to_jiffies(msec); | |
142 | while (time_before(jiffies, expire)) { | |
143 | if (gpio_get_value(rstout) == 1) | |
144 | return MG_ERR_NONE; | |
145 | msleep(10); | |
146 | } | |
147 | ||
148 | return MG_ERR_RSTOUT; | |
149 | } | |
150 | ||
151 | static void mg_unexpected_intr(struct mg_host *host) | |
152 | { | |
153 | u32 status = inb((unsigned long)host->dev_base + MG_REG_STATUS); | |
154 | ||
155 | mg_dump_status("mg_unexpected_intr", status, host); | |
156 | } | |
157 | ||
158 | static irqreturn_t mg_irq(int irq, void *dev_id) | |
159 | { | |
160 | struct mg_host *host = dev_id; | |
161 | void (*handler)(struct mg_host *) = host->mg_do_intr; | |
162 | ||
39f36b47 TH |
163 | spin_lock(&host->lock); |
164 | ||
165 | host->mg_do_intr = NULL; | |
3fbed4c6 K |
166 | del_timer(&host->timer); |
167 | if (!handler) | |
168 | handler = mg_unexpected_intr; | |
169 | handler(host); | |
39f36b47 TH |
170 | |
171 | spin_unlock(&host->lock); | |
172 | ||
3fbed4c6 K |
173 | return IRQ_HANDLED; |
174 | } | |
175 | ||
176 | static int mg_get_disk_id(struct mg_host *host) | |
177 | { | |
178 | u32 i; | |
179 | s32 err; | |
180 | const u16 *id = host->id; | |
181 | struct mg_drv_data *prv_data = host->dev->platform_data; | |
182 | char fwrev[ATA_ID_FW_REV_LEN + 1]; | |
183 | char model[ATA_ID_PROD_LEN + 1]; | |
184 | char serial[ATA_ID_SERNO_LEN + 1]; | |
185 | ||
186 | if (!prv_data->use_polling) | |
187 | outb(MG_REG_CTRL_INTR_DISABLE, | |
188 | (unsigned long)host->dev_base + | |
189 | MG_REG_DRV_CTRL); | |
190 | ||
191 | outb(MG_CMD_ID, (unsigned long)host->dev_base + MG_REG_COMMAND); | |
192 | err = mg_wait(host, MG_REG_STATUS_BIT_DATA_REQ, MG_TMAX_WAIT_RD_DRQ); | |
193 | if (err) | |
194 | return err; | |
195 | ||
196 | for (i = 0; i < (MG_SECTOR_SIZE >> 1); i++) | |
197 | host->id[i] = le16_to_cpu(inw((unsigned long)host->dev_base + | |
198 | MG_BUFF_OFFSET + i * 2)); | |
199 | ||
200 | outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND); | |
201 | err = mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD); | |
202 | if (err) | |
203 | return err; | |
204 | ||
205 | if ((id[ATA_ID_FIELD_VALID] & 1) == 0) | |
206 | return MG_ERR_TRANSLATION; | |
207 | ||
208 | host->n_sectors = ata_id_u32(id, ATA_ID_LBA_CAPACITY); | |
209 | host->cyls = id[ATA_ID_CYLS]; | |
210 | host->heads = id[ATA_ID_HEADS]; | |
211 | host->sectors = id[ATA_ID_SECTORS]; | |
212 | ||
213 | if (MG_RES_SEC && host->heads && host->sectors) { | |
214 | /* modify cyls, n_sectors */ | |
215 | host->cyls = (host->n_sectors - MG_RES_SEC) / | |
216 | host->heads / host->sectors; | |
217 | host->nres_sectors = host->n_sectors - host->cyls * | |
218 | host->heads * host->sectors; | |
219 | host->n_sectors -= host->nres_sectors; | |
220 | } | |
221 | ||
222 | ata_id_c_string(id, fwrev, ATA_ID_FW_REV, sizeof(fwrev)); | |
223 | ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model)); | |
224 | ata_id_c_string(id, serial, ATA_ID_SERNO, sizeof(serial)); | |
225 | printk(KERN_INFO "mg_disk: model: %s\n", model); | |
226 | printk(KERN_INFO "mg_disk: firm: %.8s\n", fwrev); | |
227 | printk(KERN_INFO "mg_disk: serial: %s\n", serial); | |
228 | printk(KERN_INFO "mg_disk: %d + reserved %d sectors\n", | |
229 | host->n_sectors, host->nres_sectors); | |
230 | ||
231 | if (!prv_data->use_polling) | |
232 | outb(MG_REG_CTRL_INTR_ENABLE, (unsigned long)host->dev_base + | |
233 | MG_REG_DRV_CTRL); | |
234 | ||
235 | return err; | |
236 | } | |
237 | ||
238 | ||
239 | static int mg_disk_init(struct mg_host *host) | |
240 | { | |
241 | struct mg_drv_data *prv_data = host->dev->platform_data; | |
242 | s32 err; | |
243 | u8 init_status; | |
244 | ||
245 | /* hdd rst low */ | |
246 | gpio_set_value(host->rst, 0); | |
247 | err = mg_wait(host, MG_REG_STATUS_BIT_BUSY, MG_TMAX_RST_TO_BUSY); | |
248 | if (err) | |
249 | return err; | |
250 | ||
251 | /* hdd rst high */ | |
252 | gpio_set_value(host->rst, 1); | |
253 | err = mg_wait(host, MG_STAT_READY, MG_TMAX_HDRST_TO_RDY); | |
254 | if (err) | |
255 | return err; | |
256 | ||
257 | /* soft reset on */ | |
258 | outb(MG_REG_CTRL_RESET | | |
259 | (prv_data->use_polling ? MG_REG_CTRL_INTR_DISABLE : | |
260 | MG_REG_CTRL_INTR_ENABLE), | |
261 | (unsigned long)host->dev_base + MG_REG_DRV_CTRL); | |
262 | err = mg_wait(host, MG_REG_STATUS_BIT_BUSY, MG_TMAX_RST_TO_BUSY); | |
263 | if (err) | |
264 | return err; | |
265 | ||
266 | /* soft reset off */ | |
267 | outb(prv_data->use_polling ? MG_REG_CTRL_INTR_DISABLE : | |
268 | MG_REG_CTRL_INTR_ENABLE, | |
269 | (unsigned long)host->dev_base + MG_REG_DRV_CTRL); | |
270 | err = mg_wait(host, MG_STAT_READY, MG_TMAX_SWRST_TO_RDY); | |
271 | if (err) | |
272 | return err; | |
273 | ||
274 | init_status = inb((unsigned long)host->dev_base + MG_REG_STATUS) & 0xf; | |
275 | ||
276 | if (init_status == 0xf) | |
277 | return MG_ERR_INIT_STAT; | |
278 | ||
279 | return err; | |
280 | } | |
281 | ||
282 | static void mg_bad_rw_intr(struct mg_host *host) | |
283 | { | |
284 | struct request *req = elv_next_request(host->breq); | |
285 | if (req != NULL) | |
286 | if (++req->errors >= MG_MAX_ERRORS || | |
287 | host->error == MG_ERR_TIMEOUT) | |
288 | end_request(req, 0); | |
289 | } | |
290 | ||
291 | static unsigned int mg_out(struct mg_host *host, | |
292 | unsigned int sect_num, | |
293 | unsigned int sect_cnt, | |
294 | unsigned int cmd, | |
295 | void (*intr_addr)(struct mg_host *)) | |
296 | { | |
297 | struct mg_drv_data *prv_data = host->dev->platform_data; | |
298 | ||
299 | if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD)) | |
300 | return host->error; | |
301 | ||
302 | if (!prv_data->use_polling) { | |
303 | host->mg_do_intr = intr_addr; | |
304 | mod_timer(&host->timer, jiffies + 3 * HZ); | |
305 | } | |
306 | if (MG_RES_SEC) | |
307 | sect_num += MG_RES_SEC; | |
308 | outb((u8)sect_cnt, (unsigned long)host->dev_base + MG_REG_SECT_CNT); | |
309 | outb((u8)sect_num, (unsigned long)host->dev_base + MG_REG_SECT_NUM); | |
310 | outb((u8)(sect_num >> 8), (unsigned long)host->dev_base + | |
311 | MG_REG_CYL_LOW); | |
312 | outb((u8)(sect_num >> 16), (unsigned long)host->dev_base + | |
313 | MG_REG_CYL_HIGH); | |
314 | outb((u8)((sect_num >> 24) | MG_REG_HEAD_LBA_MODE), | |
315 | (unsigned long)host->dev_base + MG_REG_DRV_HEAD); | |
316 | outb(cmd, (unsigned long)host->dev_base + MG_REG_COMMAND); | |
317 | return MG_ERR_NONE; | |
318 | } | |
319 | ||
320 | static void mg_read(struct request *req) | |
321 | { | |
322 | u32 remains, j; | |
323 | struct mg_host *host = req->rq_disk->private_data; | |
324 | ||
325 | remains = req->nr_sectors; | |
326 | ||
39f36b47 | 327 | if (mg_out(host, req->sector, req->nr_sectors, MG_CMD_RD, NULL) != |
3fbed4c6 K |
328 | MG_ERR_NONE) |
329 | mg_bad_rw_intr(host); | |
330 | ||
331 | MG_DBG("requested %d sects (from %ld), buffer=0x%p\n", | |
332 | remains, req->sector, req->buffer); | |
333 | ||
334 | while (remains) { | |
335 | if (mg_wait(host, MG_REG_STATUS_BIT_DATA_REQ, | |
336 | MG_TMAX_WAIT_RD_DRQ) != MG_ERR_NONE) { | |
337 | mg_bad_rw_intr(host); | |
338 | return; | |
339 | } | |
340 | for (j = 0; j < MG_SECTOR_SIZE >> 1; j++) { | |
341 | *(u16 *)req->buffer = | |
342 | inw((unsigned long)host->dev_base + | |
343 | MG_BUFF_OFFSET + (j << 1)); | |
344 | req->buffer += 2; | |
345 | } | |
346 | ||
347 | req->sector++; | |
348 | req->errors = 0; | |
349 | remains = --req->nr_sectors; | |
350 | --req->current_nr_sectors; | |
351 | ||
352 | if (req->current_nr_sectors <= 0) { | |
353 | MG_DBG("remain : %d sects\n", remains); | |
354 | end_request(req, 1); | |
355 | if (remains > 0) | |
356 | req = elv_next_request(host->breq); | |
357 | } | |
358 | ||
359 | outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base + | |
360 | MG_REG_COMMAND); | |
361 | } | |
362 | } | |
363 | ||
364 | static void mg_write(struct request *req) | |
365 | { | |
366 | u32 remains, j; | |
367 | struct mg_host *host = req->rq_disk->private_data; | |
368 | ||
369 | remains = req->nr_sectors; | |
370 | ||
39f36b47 | 371 | if (mg_out(host, req->sector, req->nr_sectors, MG_CMD_WR, NULL) != |
3fbed4c6 K |
372 | MG_ERR_NONE) { |
373 | mg_bad_rw_intr(host); | |
374 | return; | |
375 | } | |
376 | ||
377 | ||
378 | MG_DBG("requested %d sects (from %ld), buffer=0x%p\n", | |
379 | remains, req->sector, req->buffer); | |
380 | while (remains) { | |
381 | if (mg_wait(host, MG_REG_STATUS_BIT_DATA_REQ, | |
382 | MG_TMAX_WAIT_WR_DRQ) != MG_ERR_NONE) { | |
383 | mg_bad_rw_intr(host); | |
384 | return; | |
385 | } | |
386 | for (j = 0; j < MG_SECTOR_SIZE >> 1; j++) { | |
387 | outw(*(u16 *)req->buffer, | |
388 | (unsigned long)host->dev_base + | |
389 | MG_BUFF_OFFSET + (j << 1)); | |
390 | req->buffer += 2; | |
391 | } | |
392 | req->sector++; | |
393 | remains = --req->nr_sectors; | |
394 | --req->current_nr_sectors; | |
395 | ||
396 | if (req->current_nr_sectors <= 0) { | |
397 | MG_DBG("remain : %d sects\n", remains); | |
398 | end_request(req, 1); | |
399 | if (remains > 0) | |
400 | req = elv_next_request(host->breq); | |
401 | } | |
402 | ||
403 | outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base + | |
404 | MG_REG_COMMAND); | |
405 | } | |
406 | } | |
407 | ||
408 | static void mg_read_intr(struct mg_host *host) | |
409 | { | |
410 | u32 i; | |
411 | struct request *req; | |
412 | ||
413 | /* check status */ | |
414 | do { | |
415 | i = inb((unsigned long)host->dev_base + MG_REG_STATUS); | |
416 | if (i & MG_REG_STATUS_BIT_BUSY) | |
417 | break; | |
418 | if (!MG_READY_OK(i)) | |
419 | break; | |
420 | if (i & MG_REG_STATUS_BIT_DATA_REQ) | |
421 | goto ok_to_read; | |
422 | } while (0); | |
423 | mg_dump_status("mg_read_intr", i, host); | |
424 | mg_bad_rw_intr(host); | |
425 | mg_request(host->breq); | |
426 | return; | |
427 | ||
428 | ok_to_read: | |
429 | /* get current segment of request */ | |
430 | req = elv_next_request(host->breq); | |
431 | ||
432 | /* read 1 sector */ | |
433 | for (i = 0; i < MG_SECTOR_SIZE >> 1; i++) { | |
434 | *(u16 *)req->buffer = | |
435 | inw((unsigned long)host->dev_base + MG_BUFF_OFFSET + | |
436 | (i << 1)); | |
437 | req->buffer += 2; | |
438 | } | |
439 | ||
440 | /* manipulate request */ | |
441 | MG_DBG("sector %ld, remaining=%ld, buffer=0x%p\n", | |
442 | req->sector, req->nr_sectors - 1, req->buffer); | |
443 | ||
444 | req->sector++; | |
445 | req->errors = 0; | |
446 | i = --req->nr_sectors; | |
447 | --req->current_nr_sectors; | |
448 | ||
449 | /* let know if current segment done */ | |
450 | if (req->current_nr_sectors <= 0) | |
451 | end_request(req, 1); | |
452 | ||
453 | /* set handler if read remains */ | |
454 | if (i > 0) { | |
455 | host->mg_do_intr = mg_read_intr; | |
456 | mod_timer(&host->timer, jiffies + 3 * HZ); | |
457 | } | |
458 | ||
459 | /* send read confirm */ | |
460 | outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND); | |
461 | ||
462 | /* goto next request */ | |
463 | if (!i) | |
464 | mg_request(host->breq); | |
465 | } | |
466 | ||
467 | static void mg_write_intr(struct mg_host *host) | |
468 | { | |
469 | u32 i, j; | |
470 | u16 *buff; | |
471 | struct request *req; | |
472 | ||
473 | /* get current segment of request */ | |
474 | req = elv_next_request(host->breq); | |
475 | ||
476 | /* check status */ | |
477 | do { | |
478 | i = inb((unsigned long)host->dev_base + MG_REG_STATUS); | |
479 | if (i & MG_REG_STATUS_BIT_BUSY) | |
480 | break; | |
481 | if (!MG_READY_OK(i)) | |
482 | break; | |
483 | if ((req->nr_sectors <= 1) || (i & MG_REG_STATUS_BIT_DATA_REQ)) | |
484 | goto ok_to_write; | |
485 | } while (0); | |
486 | mg_dump_status("mg_write_intr", i, host); | |
487 | mg_bad_rw_intr(host); | |
488 | mg_request(host->breq); | |
489 | return; | |
490 | ||
491 | ok_to_write: | |
492 | /* manipulate request */ | |
493 | req->sector++; | |
494 | i = --req->nr_sectors; | |
495 | --req->current_nr_sectors; | |
496 | req->buffer += MG_SECTOR_SIZE; | |
497 | ||
498 | /* let know if current segment or all done */ | |
499 | if (!i || (req->bio && req->current_nr_sectors <= 0)) | |
500 | end_request(req, 1); | |
501 | ||
502 | /* write 1 sector and set handler if remains */ | |
503 | if (i > 0) { | |
504 | buff = (u16 *)req->buffer; | |
505 | for (j = 0; j < MG_STORAGE_BUFFER_SIZE >> 1; j++) { | |
506 | outw(*buff, (unsigned long)host->dev_base + | |
507 | MG_BUFF_OFFSET + (j << 1)); | |
508 | buff++; | |
509 | } | |
510 | MG_DBG("sector %ld, remaining=%ld, buffer=0x%p\n", | |
511 | req->sector, req->nr_sectors, req->buffer); | |
512 | host->mg_do_intr = mg_write_intr; | |
513 | mod_timer(&host->timer, jiffies + 3 * HZ); | |
514 | } | |
515 | ||
516 | /* send write confirm */ | |
517 | outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND); | |
518 | ||
519 | if (!i) | |
520 | mg_request(host->breq); | |
521 | } | |
522 | ||
523 | void mg_times_out(unsigned long data) | |
524 | { | |
525 | struct mg_host *host = (struct mg_host *)data; | |
526 | char *name; | |
527 | struct request *req; | |
528 | ||
39f36b47 TH |
529 | spin_lock_irq(&host->lock); |
530 | ||
3fbed4c6 K |
531 | req = elv_next_request(host->breq); |
532 | if (!req) | |
39f36b47 | 533 | goto out_unlock; |
3fbed4c6 K |
534 | |
535 | host->mg_do_intr = NULL; | |
536 | ||
537 | name = req->rq_disk->disk_name; | |
538 | printk(KERN_DEBUG "%s: timeout\n", name); | |
539 | ||
540 | host->error = MG_ERR_TIMEOUT; | |
541 | mg_bad_rw_intr(host); | |
542 | ||
543 | mg_request(host->breq); | |
39f36b47 TH |
544 | out_unlock: |
545 | spin_unlock_irq(&host->lock); | |
3fbed4c6 K |
546 | } |
547 | ||
548 | static void mg_request_poll(struct request_queue *q) | |
549 | { | |
550 | struct request *req; | |
551 | struct mg_host *host; | |
552 | ||
553 | while ((req = elv_next_request(q)) != NULL) { | |
554 | host = req->rq_disk->private_data; | |
555 | if (blk_fs_request(req)) { | |
556 | switch (rq_data_dir(req)) { | |
557 | case READ: | |
558 | mg_read(req); | |
559 | break; | |
560 | case WRITE: | |
561 | mg_write(req); | |
562 | break; | |
563 | default: | |
564 | printk(KERN_WARNING "%s:%d unknown command\n", | |
565 | __func__, __LINE__); | |
566 | end_request(req, 0); | |
567 | break; | |
568 | } | |
569 | } | |
570 | } | |
571 | } | |
572 | ||
573 | static unsigned int mg_issue_req(struct request *req, | |
574 | struct mg_host *host, | |
575 | unsigned int sect_num, | |
576 | unsigned int sect_cnt) | |
577 | { | |
578 | u16 *buff; | |
579 | u32 i; | |
580 | ||
581 | switch (rq_data_dir(req)) { | |
582 | case READ: | |
583 | if (mg_out(host, sect_num, sect_cnt, MG_CMD_RD, &mg_read_intr) | |
584 | != MG_ERR_NONE) { | |
585 | mg_bad_rw_intr(host); | |
586 | return host->error; | |
587 | } | |
588 | break; | |
589 | case WRITE: | |
590 | /* TODO : handler */ | |
591 | outb(MG_REG_CTRL_INTR_DISABLE, | |
592 | (unsigned long)host->dev_base + | |
593 | MG_REG_DRV_CTRL); | |
594 | if (mg_out(host, sect_num, sect_cnt, MG_CMD_WR, &mg_write_intr) | |
595 | != MG_ERR_NONE) { | |
596 | mg_bad_rw_intr(host); | |
597 | return host->error; | |
598 | } | |
599 | del_timer(&host->timer); | |
600 | mg_wait(host, MG_REG_STATUS_BIT_DATA_REQ, MG_TMAX_WAIT_WR_DRQ); | |
601 | outb(MG_REG_CTRL_INTR_ENABLE, (unsigned long)host->dev_base + | |
602 | MG_REG_DRV_CTRL); | |
603 | if (host->error) { | |
604 | mg_bad_rw_intr(host); | |
605 | return host->error; | |
606 | } | |
607 | buff = (u16 *)req->buffer; | |
608 | for (i = 0; i < MG_SECTOR_SIZE >> 1; i++) { | |
609 | outw(*buff, (unsigned long)host->dev_base + | |
610 | MG_BUFF_OFFSET + (i << 1)); | |
611 | buff++; | |
612 | } | |
613 | mod_timer(&host->timer, jiffies + 3 * HZ); | |
614 | outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base + | |
615 | MG_REG_COMMAND); | |
616 | break; | |
617 | default: | |
618 | printk(KERN_WARNING "%s:%d unknown command\n", | |
619 | __func__, __LINE__); | |
620 | end_request(req, 0); | |
621 | break; | |
622 | } | |
623 | return MG_ERR_NONE; | |
624 | } | |
625 | ||
626 | /* This function also called from IRQ context */ | |
627 | static void mg_request(struct request_queue *q) | |
628 | { | |
629 | struct request *req; | |
630 | struct mg_host *host; | |
631 | u32 sect_num, sect_cnt; | |
632 | ||
633 | while (1) { | |
634 | req = elv_next_request(q); | |
635 | if (!req) | |
636 | return; | |
637 | ||
638 | host = req->rq_disk->private_data; | |
639 | ||
640 | /* check unwanted request call */ | |
641 | if (host->mg_do_intr) | |
642 | return; | |
643 | ||
644 | del_timer(&host->timer); | |
645 | ||
646 | sect_num = req->sector; | |
647 | /* deal whole segments */ | |
648 | sect_cnt = req->nr_sectors; | |
649 | ||
650 | /* sanity check */ | |
651 | if (sect_num >= get_capacity(req->rq_disk) || | |
652 | ((sect_num + sect_cnt) > | |
653 | get_capacity(req->rq_disk))) { | |
654 | printk(KERN_WARNING | |
655 | "%s: bad access: sector=%d, count=%d\n", | |
656 | req->rq_disk->disk_name, | |
657 | sect_num, sect_cnt); | |
658 | end_request(req, 0); | |
659 | continue; | |
660 | } | |
661 | ||
662 | if (!blk_fs_request(req)) | |
663 | return; | |
664 | ||
665 | if (!mg_issue_req(req, host, sect_num, sect_cnt)) | |
666 | return; | |
667 | } | |
668 | } | |
669 | ||
670 | static int mg_getgeo(struct block_device *bdev, struct hd_geometry *geo) | |
671 | { | |
672 | struct mg_host *host = bdev->bd_disk->private_data; | |
673 | ||
674 | geo->cylinders = (unsigned short)host->cyls; | |
675 | geo->heads = (unsigned char)host->heads; | |
676 | geo->sectors = (unsigned char)host->sectors; | |
677 | return 0; | |
678 | } | |
679 | ||
680 | static struct block_device_operations mg_disk_ops = { | |
681 | .getgeo = mg_getgeo | |
682 | }; | |
683 | ||
684 | static int mg_suspend(struct platform_device *plat_dev, pm_message_t state) | |
685 | { | |
686 | struct mg_drv_data *prv_data = plat_dev->dev.platform_data; | |
687 | struct mg_host *host = prv_data->host; | |
688 | ||
689 | if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD)) | |
690 | return -EIO; | |
691 | ||
692 | if (!prv_data->use_polling) | |
693 | outb(MG_REG_CTRL_INTR_DISABLE, | |
694 | (unsigned long)host->dev_base + | |
695 | MG_REG_DRV_CTRL); | |
696 | ||
697 | outb(MG_CMD_SLEEP, (unsigned long)host->dev_base + MG_REG_COMMAND); | |
698 | /* wait until mflash deep sleep */ | |
699 | msleep(1); | |
700 | ||
701 | if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD)) { | |
702 | if (!prv_data->use_polling) | |
703 | outb(MG_REG_CTRL_INTR_ENABLE, | |
704 | (unsigned long)host->dev_base + | |
705 | MG_REG_DRV_CTRL); | |
706 | return -EIO; | |
707 | } | |
708 | ||
709 | return 0; | |
710 | } | |
711 | ||
712 | static int mg_resume(struct platform_device *plat_dev) | |
713 | { | |
714 | struct mg_drv_data *prv_data = plat_dev->dev.platform_data; | |
715 | struct mg_host *host = prv_data->host; | |
716 | ||
717 | if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD)) | |
718 | return -EIO; | |
719 | ||
720 | outb(MG_CMD_WAKEUP, (unsigned long)host->dev_base + MG_REG_COMMAND); | |
721 | /* wait until mflash wakeup */ | |
722 | msleep(1); | |
723 | ||
724 | if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD)) | |
725 | return -EIO; | |
726 | ||
727 | if (!prv_data->use_polling) | |
728 | outb(MG_REG_CTRL_INTR_ENABLE, (unsigned long)host->dev_base + | |
729 | MG_REG_DRV_CTRL); | |
730 | ||
731 | return 0; | |
732 | } | |
733 | ||
734 | static int mg_probe(struct platform_device *plat_dev) | |
735 | { | |
736 | struct mg_host *host; | |
737 | struct resource *rsc; | |
738 | struct mg_drv_data *prv_data = plat_dev->dev.platform_data; | |
739 | int err = 0; | |
740 | ||
741 | if (!prv_data) { | |
742 | printk(KERN_ERR "%s:%d fail (no driver_data)\n", | |
743 | __func__, __LINE__); | |
744 | err = -EINVAL; | |
745 | goto probe_err; | |
746 | } | |
747 | ||
748 | /* alloc mg_host */ | |
749 | host = kzalloc(sizeof(struct mg_host), GFP_KERNEL); | |
750 | if (!host) { | |
751 | printk(KERN_ERR "%s:%d fail (no memory for mg_host)\n", | |
752 | __func__, __LINE__); | |
753 | err = -ENOMEM; | |
754 | goto probe_err; | |
755 | } | |
756 | host->major = MG_DISK_MAJ; | |
757 | ||
758 | /* link each other */ | |
759 | prv_data->host = host; | |
760 | host->dev = &plat_dev->dev; | |
761 | ||
762 | /* io remap */ | |
763 | rsc = platform_get_resource(plat_dev, IORESOURCE_MEM, 0); | |
764 | if (!rsc) { | |
765 | printk(KERN_ERR "%s:%d platform_get_resource fail\n", | |
766 | __func__, __LINE__); | |
767 | err = -EINVAL; | |
768 | goto probe_err_2; | |
769 | } | |
770 | host->dev_base = ioremap(rsc->start , rsc->end + 1); | |
771 | if (!host->dev_base) { | |
772 | printk(KERN_ERR "%s:%d ioremap fail\n", | |
773 | __func__, __LINE__); | |
774 | err = -EIO; | |
775 | goto probe_err_2; | |
776 | } | |
777 | MG_DBG("dev_base = 0x%x\n", (u32)host->dev_base); | |
778 | ||
779 | /* get reset pin */ | |
780 | rsc = platform_get_resource_byname(plat_dev, IORESOURCE_IO, | |
781 | MG_RST_PIN); | |
782 | if (!rsc) { | |
783 | printk(KERN_ERR "%s:%d get reset pin fail\n", | |
784 | __func__, __LINE__); | |
785 | err = -EIO; | |
786 | goto probe_err_3; | |
787 | } | |
788 | host->rst = rsc->start; | |
789 | ||
790 | /* init rst pin */ | |
791 | err = gpio_request(host->rst, MG_RST_PIN); | |
792 | if (err) | |
793 | goto probe_err_3; | |
794 | gpio_direction_output(host->rst, 1); | |
795 | ||
796 | /* reset out pin */ | |
797 | if (!(prv_data->dev_attr & MG_DEV_MASK)) | |
798 | goto probe_err_3a; | |
799 | ||
800 | if (prv_data->dev_attr != MG_BOOT_DEV) { | |
801 | rsc = platform_get_resource_byname(plat_dev, IORESOURCE_IO, | |
802 | MG_RSTOUT_PIN); | |
803 | if (!rsc) { | |
804 | printk(KERN_ERR "%s:%d get reset-out pin fail\n", | |
805 | __func__, __LINE__); | |
806 | err = -EIO; | |
807 | goto probe_err_3a; | |
808 | } | |
809 | host->rstout = rsc->start; | |
810 | err = gpio_request(host->rstout, MG_RSTOUT_PIN); | |
811 | if (err) | |
812 | goto probe_err_3a; | |
813 | gpio_direction_input(host->rstout); | |
814 | } | |
815 | ||
816 | /* disk reset */ | |
817 | if (prv_data->dev_attr == MG_STORAGE_DEV) { | |
818 | /* If POR seq. not yet finised, wait */ | |
819 | err = mg_wait_rstout(host->rstout, MG_TMAX_RSTOUT); | |
820 | if (err) | |
821 | goto probe_err_3b; | |
822 | err = mg_disk_init(host); | |
823 | if (err) { | |
824 | printk(KERN_ERR "%s:%d fail (err code : %d)\n", | |
825 | __func__, __LINE__, err); | |
826 | err = -EIO; | |
827 | goto probe_err_3b; | |
828 | } | |
829 | } | |
830 | ||
831 | /* get irq resource */ | |
832 | if (!prv_data->use_polling) { | |
833 | host->irq = platform_get_irq(plat_dev, 0); | |
834 | if (host->irq == -ENXIO) { | |
835 | err = host->irq; | |
836 | goto probe_err_3b; | |
837 | } | |
838 | err = request_irq(host->irq, mg_irq, | |
839 | IRQF_DISABLED | IRQF_TRIGGER_RISING, | |
840 | MG_DEV_NAME, host); | |
841 | if (err) { | |
842 | printk(KERN_ERR "%s:%d fail (request_irq err=%d)\n", | |
843 | __func__, __LINE__, err); | |
844 | goto probe_err_3b; | |
845 | } | |
846 | ||
847 | } | |
848 | ||
849 | /* get disk id */ | |
850 | err = mg_get_disk_id(host); | |
851 | if (err) { | |
852 | printk(KERN_ERR "%s:%d fail (err code : %d)\n", | |
853 | __func__, __LINE__, err); | |
854 | err = -EIO; | |
855 | goto probe_err_4; | |
856 | } | |
857 | ||
858 | err = register_blkdev(host->major, MG_DISK_NAME); | |
859 | if (err < 0) { | |
860 | printk(KERN_ERR "%s:%d register_blkdev fail (err code : %d)\n", | |
861 | __func__, __LINE__, err); | |
862 | goto probe_err_4; | |
863 | } | |
864 | if (!host->major) | |
865 | host->major = err; | |
866 | ||
867 | spin_lock_init(&host->lock); | |
868 | ||
869 | if (prv_data->use_polling) | |
870 | host->breq = blk_init_queue(mg_request_poll, &host->lock); | |
871 | else | |
872 | host->breq = blk_init_queue(mg_request, &host->lock); | |
873 | ||
874 | if (!host->breq) { | |
875 | err = -ENOMEM; | |
876 | printk(KERN_ERR "%s:%d (blk_init_queue) fail\n", | |
877 | __func__, __LINE__); | |
878 | goto probe_err_5; | |
879 | } | |
880 | ||
881 | /* mflash is random device, thanx for the noop */ | |
882 | elevator_exit(host->breq->elevator); | |
883 | err = elevator_init(host->breq, "noop"); | |
884 | if (err) { | |
885 | printk(KERN_ERR "%s:%d (elevator_init) fail\n", | |
886 | __func__, __LINE__); | |
887 | goto probe_err_6; | |
888 | } | |
889 | blk_queue_max_sectors(host->breq, MG_MAX_SECTS); | |
890 | blk_queue_hardsect_size(host->breq, MG_SECTOR_SIZE); | |
891 | ||
892 | init_timer(&host->timer); | |
893 | host->timer.function = mg_times_out; | |
894 | host->timer.data = (unsigned long)host; | |
895 | ||
896 | host->gd = alloc_disk(MG_DISK_MAX_PART); | |
897 | if (!host->gd) { | |
898 | printk(KERN_ERR "%s:%d (alloc_disk) fail\n", | |
899 | __func__, __LINE__); | |
900 | err = -ENOMEM; | |
901 | goto probe_err_7; | |
902 | } | |
903 | host->gd->major = host->major; | |
904 | host->gd->first_minor = 0; | |
905 | host->gd->fops = &mg_disk_ops; | |
906 | host->gd->queue = host->breq; | |
907 | host->gd->private_data = host; | |
908 | sprintf(host->gd->disk_name, MG_DISK_NAME"a"); | |
909 | ||
910 | set_capacity(host->gd, host->n_sectors); | |
911 | ||
912 | add_disk(host->gd); | |
913 | ||
914 | return err; | |
915 | ||
916 | probe_err_7: | |
917 | del_timer_sync(&host->timer); | |
918 | probe_err_6: | |
919 | blk_cleanup_queue(host->breq); | |
920 | probe_err_5: | |
921 | unregister_blkdev(MG_DISK_MAJ, MG_DISK_NAME); | |
922 | probe_err_4: | |
923 | if (!prv_data->use_polling) | |
924 | free_irq(host->irq, host); | |
925 | probe_err_3b: | |
926 | gpio_free(host->rstout); | |
927 | probe_err_3a: | |
928 | gpio_free(host->rst); | |
929 | probe_err_3: | |
930 | iounmap(host->dev_base); | |
931 | probe_err_2: | |
932 | kfree(host); | |
933 | probe_err: | |
934 | return err; | |
935 | } | |
936 | ||
937 | static int mg_remove(struct platform_device *plat_dev) | |
938 | { | |
939 | struct mg_drv_data *prv_data = plat_dev->dev.platform_data; | |
940 | struct mg_host *host = prv_data->host; | |
941 | int err = 0; | |
942 | ||
943 | /* delete timer */ | |
944 | del_timer_sync(&host->timer); | |
945 | ||
946 | /* remove disk */ | |
947 | if (host->gd) { | |
948 | del_gendisk(host->gd); | |
949 | put_disk(host->gd); | |
950 | } | |
951 | /* remove queue */ | |
952 | if (host->breq) | |
953 | blk_cleanup_queue(host->breq); | |
954 | ||
955 | /* unregister blk device */ | |
956 | unregister_blkdev(host->major, MG_DISK_NAME); | |
957 | ||
958 | /* free irq */ | |
959 | if (!prv_data->use_polling) | |
960 | free_irq(host->irq, host); | |
961 | ||
962 | /* free reset-out pin */ | |
963 | if (prv_data->dev_attr != MG_BOOT_DEV) | |
964 | gpio_free(host->rstout); | |
965 | ||
966 | /* free rst pin */ | |
967 | if (host->rst) | |
968 | gpio_free(host->rst); | |
969 | ||
970 | /* unmap io */ | |
971 | if (host->dev_base) | |
972 | iounmap(host->dev_base); | |
973 | ||
974 | /* free mg_host */ | |
975 | kfree(host); | |
976 | ||
977 | return err; | |
978 | } | |
979 | ||
980 | static struct platform_driver mg_disk_driver = { | |
981 | .probe = mg_probe, | |
982 | .remove = mg_remove, | |
983 | .suspend = mg_suspend, | |
984 | .resume = mg_resume, | |
985 | .driver = { | |
986 | .name = MG_DEV_NAME, | |
987 | .owner = THIS_MODULE, | |
988 | } | |
989 | }; | |
990 | ||
991 | /**************************************************************************** | |
992 | * | |
993 | * Module stuff | |
994 | * | |
995 | ****************************************************************************/ | |
996 | ||
997 | static int __init mg_init(void) | |
998 | { | |
999 | printk(KERN_INFO "mGine mflash driver, (c) 2008 mGine Co.\n"); | |
1000 | return platform_driver_register(&mg_disk_driver); | |
1001 | } | |
1002 | ||
1003 | static void __exit mg_exit(void) | |
1004 | { | |
1005 | printk(KERN_INFO "mflash driver : bye bye\n"); | |
1006 | platform_driver_unregister(&mg_disk_driver); | |
1007 | } | |
1008 | ||
1009 | module_init(mg_init); | |
1010 | module_exit(mg_exit); | |
1011 | ||
1012 | MODULE_LICENSE("GPL"); | |
1013 | MODULE_AUTHOR("unsik Kim <donari75@gmail.com>"); | |
1014 | MODULE_DESCRIPTION("mGine m[g]flash device driver"); |