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