2 * drivers/block/mg_disk.c
4 * Support for the mGine m[g]flash IO mode.
7 * (c) 2008 mGine Co.,LTD
8 * (c) 2008 unsik Kim <donari75@gmail.com>
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.
15 #include <linux/kernel.h>
16 #include <linux/module.h>
18 #include <linux/blkdev.h>
19 #include <linux/hdreg.h>
20 #include <linux/ata.h>
21 #include <linux/interrupt.h>
22 #include <linux/delay.h>
23 #include <linux/platform_device.h>
24 #include <linux/gpio.h>
26 #define MG_RES_SEC (CONFIG_MG_DISK_RES << 1)
28 /* name for block device */
29 #define MG_DISK_NAME "mgd"
30 /* name for platform device */
31 #define MG_DEV_NAME "mg_disk"
34 #define MG_DISK_MAX_PART 16
35 #define MG_SECTOR_SIZE 512
36 #define MG_MAX_SECTS 256
38 /* Register offsets */
39 #define MG_BUFF_OFFSET 0x8000
40 #define MG_STORAGE_BUFFER_SIZE 0x200
41 #define MG_REG_OFFSET 0xC000
42 #define MG_REG_FEATURE (MG_REG_OFFSET + 2) /* write case */
43 #define MG_REG_ERROR (MG_REG_OFFSET + 2) /* read case */
44 #define MG_REG_SECT_CNT (MG_REG_OFFSET + 4)
45 #define MG_REG_SECT_NUM (MG_REG_OFFSET + 6)
46 #define MG_REG_CYL_LOW (MG_REG_OFFSET + 8)
47 #define MG_REG_CYL_HIGH (MG_REG_OFFSET + 0xA)
48 #define MG_REG_DRV_HEAD (MG_REG_OFFSET + 0xC)
49 #define MG_REG_COMMAND (MG_REG_OFFSET + 0xE) /* write case */
50 #define MG_REG_STATUS (MG_REG_OFFSET + 0xE) /* read case */
51 #define MG_REG_DRV_CTRL (MG_REG_OFFSET + 0x10)
52 #define MG_REG_BURST_CTRL (MG_REG_OFFSET + 0x12)
55 #define MG_STAT_READY (ATA_DRDY | ATA_DSC)
56 #define MG_READY_OK(s) (((s) & (MG_STAT_READY | (ATA_BUSY | ATA_DF | \
57 ATA_ERR))) == MG_STAT_READY)
59 /* error code for others */
61 #define MG_ERR_TIMEOUT 0x100
62 #define MG_ERR_INIT_STAT 0x101
63 #define MG_ERR_TRANSLATION 0x102
64 #define MG_ERR_CTRL_RST 0x103
65 #define MG_ERR_INV_STAT 0x104
66 #define MG_ERR_RSTOUT 0x105
68 #define MG_MAX_ERRORS 6 /* Max read/write errors */
71 #define MG_CMD_RD 0x20
72 #define MG_CMD_WR 0x30
73 #define MG_CMD_SLEEP 0x99
74 #define MG_CMD_WAKEUP 0xC3
75 #define MG_CMD_ID 0xEC
76 #define MG_CMD_WR_CONF 0x3C
77 #define MG_CMD_RD_CONF 0x40
80 #define MG_OP_CASCADE (1 << 0)
81 #define MG_OP_CASCADE_SYNC_RD (1 << 1)
82 #define MG_OP_CASCADE_SYNC_WR (1 << 2)
83 #define MG_OP_INTERLEAVE (1 << 3)
86 #define MG_BURST_LAT_4 (3 << 4)
87 #define MG_BURST_LAT_5 (4 << 4)
88 #define MG_BURST_LAT_6 (5 << 4)
89 #define MG_BURST_LAT_7 (6 << 4)
90 #define MG_BURST_LAT_8 (7 << 4)
91 #define MG_BURST_LEN_4 (1 << 1)
92 #define MG_BURST_LEN_8 (2 << 1)
93 #define MG_BURST_LEN_16 (3 << 1)
94 #define MG_BURST_LEN_32 (4 << 1)
95 #define MG_BURST_LEN_CONT (0 << 1)
97 /* timeout value (unit: ms) */
98 #define MG_TMAX_CONF_TO_CMD 1
99 #define MG_TMAX_WAIT_RD_DRQ 10
100 #define MG_TMAX_WAIT_WR_DRQ 500
101 #define MG_TMAX_RST_TO_BUSY 10
102 #define MG_TMAX_HDRST_TO_RDY 500
103 #define MG_TMAX_SWRST_TO_RDY 500
104 #define MG_TMAX_RSTOUT 3000
106 /* device attribution */
107 /* use mflash as boot device */
108 #define MG_BOOT_DEV (1 << 0)
109 /* use mflash as storage device */
110 #define MG_STORAGE_DEV (1 << 1)
111 /* same as MG_STORAGE_DEV, but bootloader already done reset sequence */
112 #define MG_STORAGE_DEV_SKIP_RST (1 << 2)
114 #define MG_DEV_MASK (MG_BOOT_DEV | MG_STORAGE_DEV | MG_STORAGE_DEV_SKIP_RST)
116 /* names of GPIO resource */
117 #define MG_RST_PIN "mg_rst"
118 /* except MG_BOOT_DEV, reset-out pin should be assigned */
119 #define MG_RSTOUT_PIN "mg_rstout"
121 /* private driver data */
126 /* device attribution */
129 /* internally used */
130 struct mg_host *host;
133 /* main structure for mflash driver */
137 struct request_queue *breq;
142 struct timer_list timer;
143 void (*mg_do_intr) (struct mg_host *);
145 u16 id[ATA_ID_WORDS];
153 void __iomem *dev_base;
163 * Debugging macro and defines
167 # define MG_DBG(fmt, args...) \
168 printk(KERN_DEBUG "%s:%d "fmt, __func__, __LINE__, ##args)
169 #else /* CONFIG_MG_DEBUG */
170 # define MG_DBG(fmt, args...) do { } while (0)
171 #endif /* CONFIG_MG_DEBUG */
173 static void mg_request(struct request_queue *);
175 static bool mg_end_request(struct mg_host *host, int err, unsigned int nr_bytes)
177 if (__blk_end_request(host->req, err, nr_bytes))
184 static bool mg_end_request_cur(struct mg_host *host, int err)
186 return mg_end_request(host, err, blk_rq_cur_bytes(host->req));
189 static void mg_dump_status(const char *msg, unsigned int stat,
190 struct mg_host *host)
192 char *name = MG_DISK_NAME;
195 name = host->req->rq_disk->disk_name;
197 printk(KERN_ERR "%s: %s: status=0x%02x { ", name, msg, stat & 0xff);
201 printk("DriveReady ");
203 printk("WriteFault ");
205 printk("SeekComplete ");
207 printk("DataRequest ");
209 printk("CorrectedError ");
213 if ((stat & ATA_ERR) == 0) {
216 host->error = inb((unsigned long)host->dev_base + MG_REG_ERROR);
217 printk(KERN_ERR "%s: %s: error=0x%02x { ", name, msg,
219 if (host->error & ATA_BBK)
220 printk("BadSector ");
221 if (host->error & ATA_UNC)
222 printk("UncorrectableError ");
223 if (host->error & ATA_IDNF)
224 printk("SectorIdNotFound ");
225 if (host->error & ATA_ABORTED)
226 printk("DriveStatusError ");
227 if (host->error & ATA_AMNF)
228 printk("AddrMarkNotFound ");
230 if (host->error & (ATA_BBK | ATA_UNC | ATA_IDNF | ATA_AMNF)) {
232 printk(", sector=%u",
233 (unsigned int)blk_rq_pos(host->req));
239 static unsigned int mg_wait(struct mg_host *host, u32 expect, u32 msec)
242 unsigned long expire, cur_jiffies;
243 struct mg_drv_data *prv_data = host->dev->platform_data;
245 host->error = MG_ERR_NONE;
246 expire = jiffies + msecs_to_jiffies(msec);
248 status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
251 cur_jiffies = jiffies;
252 if (status & ATA_BUSY) {
253 if (expect == ATA_BUSY)
256 /* Check the error condition! */
257 if (status & ATA_ERR) {
258 mg_dump_status("mg_wait", status, host);
262 if (expect == MG_STAT_READY)
263 if (MG_READY_OK(status))
266 if (expect == ATA_DRQ)
267 if (status & ATA_DRQ)
271 mg_dump_status("not ready", status, host);
272 return MG_ERR_INV_STAT;
274 if (prv_data->use_polling)
277 status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
278 } while (time_before(cur_jiffies, expire));
280 if (time_after_eq(cur_jiffies, expire) && msec)
281 host->error = MG_ERR_TIMEOUT;
286 static unsigned int mg_wait_rstout(u32 rstout, u32 msec)
288 unsigned long expire;
290 expire = jiffies + msecs_to_jiffies(msec);
291 while (time_before(jiffies, expire)) {
292 if (gpio_get_value(rstout) == 1)
297 return MG_ERR_RSTOUT;
300 static void mg_unexpected_intr(struct mg_host *host)
302 u32 status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
304 mg_dump_status("mg_unexpected_intr", status, host);
307 static irqreturn_t mg_irq(int irq, void *dev_id)
309 struct mg_host *host = dev_id;
310 void (*handler)(struct mg_host *) = host->mg_do_intr;
312 spin_lock(&host->lock);
314 host->mg_do_intr = NULL;
315 del_timer(&host->timer);
317 handler = mg_unexpected_intr;
320 spin_unlock(&host->lock);
325 /* local copy of ata_id_string() */
326 static void mg_id_string(const u16 *id, unsigned char *s,
327 unsigned int ofs, unsigned int len)
347 /* local copy of ata_id_c_string() */
348 static void mg_id_c_string(const u16 *id, unsigned char *s,
349 unsigned int ofs, unsigned int len)
353 mg_id_string(id, s, ofs, len - 1);
355 p = s + strnlen(s, len - 1);
356 while (p > s && p[-1] == ' ')
361 static int mg_get_disk_id(struct mg_host *host)
365 const u16 *id = host->id;
366 struct mg_drv_data *prv_data = host->dev->platform_data;
367 char fwrev[ATA_ID_FW_REV_LEN + 1];
368 char model[ATA_ID_PROD_LEN + 1];
369 char serial[ATA_ID_SERNO_LEN + 1];
371 if (!prv_data->use_polling)
372 outb(ATA_NIEN, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
374 outb(MG_CMD_ID, (unsigned long)host->dev_base + MG_REG_COMMAND);
375 err = mg_wait(host, ATA_DRQ, MG_TMAX_WAIT_RD_DRQ);
379 for (i = 0; i < (MG_SECTOR_SIZE >> 1); i++)
380 host->id[i] = le16_to_cpu(inw((unsigned long)host->dev_base +
381 MG_BUFF_OFFSET + i * 2));
383 outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND);
384 err = mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD);
388 if ((id[ATA_ID_FIELD_VALID] & 1) == 0)
389 return MG_ERR_TRANSLATION;
391 host->n_sectors = ata_id_u32(id, ATA_ID_LBA_CAPACITY);
392 host->cyls = id[ATA_ID_CYLS];
393 host->heads = id[ATA_ID_HEADS];
394 host->sectors = id[ATA_ID_SECTORS];
396 if (MG_RES_SEC && host->heads && host->sectors) {
397 /* modify cyls, n_sectors */
398 host->cyls = (host->n_sectors - MG_RES_SEC) /
399 host->heads / host->sectors;
400 host->nres_sectors = host->n_sectors - host->cyls *
401 host->heads * host->sectors;
402 host->n_sectors -= host->nres_sectors;
405 mg_id_c_string(id, fwrev, ATA_ID_FW_REV, sizeof(fwrev));
406 mg_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
407 mg_id_c_string(id, serial, ATA_ID_SERNO, sizeof(serial));
408 printk(KERN_INFO "mg_disk: model: %s\n", model);
409 printk(KERN_INFO "mg_disk: firm: %.8s\n", fwrev);
410 printk(KERN_INFO "mg_disk: serial: %s\n", serial);
411 printk(KERN_INFO "mg_disk: %d + reserved %d sectors\n",
412 host->n_sectors, host->nres_sectors);
414 if (!prv_data->use_polling)
415 outb(0, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
421 static int mg_disk_init(struct mg_host *host)
423 struct mg_drv_data *prv_data = host->dev->platform_data;
428 gpio_set_value(host->rst, 0);
429 err = mg_wait(host, ATA_BUSY, MG_TMAX_RST_TO_BUSY);
434 gpio_set_value(host->rst, 1);
435 err = mg_wait(host, MG_STAT_READY, MG_TMAX_HDRST_TO_RDY);
440 outb(ATA_SRST | (prv_data->use_polling ? ATA_NIEN : 0),
441 (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
442 err = mg_wait(host, ATA_BUSY, MG_TMAX_RST_TO_BUSY);
447 outb(prv_data->use_polling ? ATA_NIEN : 0,
448 (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
449 err = mg_wait(host, MG_STAT_READY, MG_TMAX_SWRST_TO_RDY);
453 init_status = inb((unsigned long)host->dev_base + MG_REG_STATUS) & 0xf;
455 if (init_status == 0xf)
456 return MG_ERR_INIT_STAT;
461 static void mg_bad_rw_intr(struct mg_host *host)
464 if (++host->req->errors >= MG_MAX_ERRORS ||
465 host->error == MG_ERR_TIMEOUT)
466 mg_end_request_cur(host, -EIO);
469 static unsigned int mg_out(struct mg_host *host,
470 unsigned int sect_num,
471 unsigned int sect_cnt,
473 void (*intr_addr)(struct mg_host *))
475 struct mg_drv_data *prv_data = host->dev->platform_data;
477 if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
480 if (!prv_data->use_polling) {
481 host->mg_do_intr = intr_addr;
482 mod_timer(&host->timer, jiffies + 3 * HZ);
485 sect_num += MG_RES_SEC;
486 outb((u8)sect_cnt, (unsigned long)host->dev_base + MG_REG_SECT_CNT);
487 outb((u8)sect_num, (unsigned long)host->dev_base + MG_REG_SECT_NUM);
488 outb((u8)(sect_num >> 8), (unsigned long)host->dev_base +
490 outb((u8)(sect_num >> 16), (unsigned long)host->dev_base +
492 outb((u8)((sect_num >> 24) | ATA_LBA | ATA_DEVICE_OBS),
493 (unsigned long)host->dev_base + MG_REG_DRV_HEAD);
494 outb(cmd, (unsigned long)host->dev_base + MG_REG_COMMAND);
498 static void mg_read(struct request *req)
501 struct mg_host *host = req->rq_disk->private_data;
503 if (mg_out(host, blk_rq_pos(req), blk_rq_sectors(req),
504 MG_CMD_RD, NULL) != MG_ERR_NONE)
505 mg_bad_rw_intr(host);
507 MG_DBG("requested %d sects (from %ld), buffer=0x%p\n",
508 blk_rq_sectors(req), blk_rq_pos(req), req->buffer);
511 u16 *buff = (u16 *)req->buffer;
513 if (mg_wait(host, ATA_DRQ,
514 MG_TMAX_WAIT_RD_DRQ) != MG_ERR_NONE) {
515 mg_bad_rw_intr(host);
518 for (j = 0; j < MG_SECTOR_SIZE >> 1; j++)
519 *buff++ = inw((unsigned long)host->dev_base +
520 MG_BUFF_OFFSET + (j << 1));
522 outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base +
524 } while (mg_end_request(host, 0, MG_SECTOR_SIZE));
527 static void mg_write(struct request *req)
530 struct mg_host *host = req->rq_disk->private_data;
532 if (mg_out(host, blk_rq_pos(req), blk_rq_sectors(req),
533 MG_CMD_WR, NULL) != MG_ERR_NONE) {
534 mg_bad_rw_intr(host);
538 MG_DBG("requested %d sects (from %ld), buffer=0x%p\n",
539 blk_rq_sectors(req), blk_rq_pos(req), req->buffer);
542 u16 *buff = (u16 *)req->buffer;
544 if (mg_wait(host, ATA_DRQ, MG_TMAX_WAIT_WR_DRQ) != MG_ERR_NONE) {
545 mg_bad_rw_intr(host);
548 for (j = 0; j < MG_SECTOR_SIZE >> 1; j++)
549 outw(*buff++, (unsigned long)host->dev_base +
550 MG_BUFF_OFFSET + (j << 1));
552 outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base +
554 } while (mg_end_request(host, 0, MG_SECTOR_SIZE));
557 static void mg_read_intr(struct mg_host *host)
559 struct request *req = host->req;
565 i = inb((unsigned long)host->dev_base + MG_REG_STATUS);
573 mg_dump_status("mg_read_intr", i, host);
574 mg_bad_rw_intr(host);
575 mg_request(host->breq);
579 /* get current segment of request */
580 buff = (u16 *)req->buffer;
583 for (i = 0; i < MG_SECTOR_SIZE >> 1; i++)
584 *buff++ = inw((unsigned long)host->dev_base + MG_BUFF_OFFSET +
587 MG_DBG("sector %ld, remaining=%ld, buffer=0x%p\n",
588 blk_rq_pos(req), blk_rq_sectors(req) - 1, req->buffer);
590 /* send read confirm */
591 outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND);
593 if (mg_end_request(host, 0, MG_SECTOR_SIZE)) {
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 */
598 mg_request(host->breq);
601 static void mg_write_intr(struct mg_host *host)
603 struct request *req = host->req;
610 i = inb((unsigned long)host->dev_base + MG_REG_STATUS);
615 if ((blk_rq_sectors(req) <= 1) || (i & ATA_DRQ))
618 mg_dump_status("mg_write_intr", i, host);
619 mg_bad_rw_intr(host);
620 mg_request(host->breq);
624 if ((rem = mg_end_request(host, 0, MG_SECTOR_SIZE))) {
625 /* write 1 sector and set handler if remains */
626 buff = (u16 *)req->buffer;
627 for (j = 0; j < MG_STORAGE_BUFFER_SIZE >> 1; j++) {
628 outw(*buff, (unsigned long)host->dev_base +
629 MG_BUFF_OFFSET + (j << 1));
632 MG_DBG("sector %ld, remaining=%ld, buffer=0x%p\n",
633 blk_rq_pos(req), blk_rq_sectors(req), req->buffer);
634 host->mg_do_intr = mg_write_intr;
635 mod_timer(&host->timer, jiffies + 3 * HZ);
638 /* send write confirm */
639 outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND);
642 mg_request(host->breq);
645 void mg_times_out(unsigned long data)
647 struct mg_host *host = (struct mg_host *)data;
650 spin_lock_irq(&host->lock);
655 host->mg_do_intr = NULL;
657 name = host->req->rq_disk->disk_name;
658 printk(KERN_DEBUG "%s: timeout\n", name);
660 host->error = MG_ERR_TIMEOUT;
661 mg_bad_rw_intr(host);
664 mg_request(host->breq);
665 spin_unlock_irq(&host->lock);
668 static void mg_request_poll(struct request_queue *q)
670 struct mg_host *host = q->queuedata;
674 host->req = elv_next_request(q);
676 blkdev_dequeue_request(host->req);
681 if (unlikely(!blk_fs_request(host->req))) {
682 mg_end_request_cur(host, -EIO);
686 if (rq_data_dir(host->req) == READ)
693 static unsigned int mg_issue_req(struct request *req,
694 struct mg_host *host,
695 unsigned int sect_num,
696 unsigned int sect_cnt)
701 switch (rq_data_dir(req)) {
703 if (mg_out(host, sect_num, sect_cnt, MG_CMD_RD, &mg_read_intr)
705 mg_bad_rw_intr(host);
711 outb(ATA_NIEN, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
712 if (mg_out(host, sect_num, sect_cnt, MG_CMD_WR, &mg_write_intr)
714 mg_bad_rw_intr(host);
717 del_timer(&host->timer);
718 mg_wait(host, ATA_DRQ, MG_TMAX_WAIT_WR_DRQ);
719 outb(0, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
721 mg_bad_rw_intr(host);
724 buff = (u16 *)req->buffer;
725 for (i = 0; i < MG_SECTOR_SIZE >> 1; i++) {
726 outw(*buff, (unsigned long)host->dev_base +
727 MG_BUFF_OFFSET + (i << 1));
730 mod_timer(&host->timer, jiffies + 3 * HZ);
731 outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base +
738 /* This function also called from IRQ context */
739 static void mg_request(struct request_queue *q)
741 struct mg_host *host = q->queuedata;
743 u32 sect_num, sect_cnt;
747 host->req = elv_next_request(q);
749 blkdev_dequeue_request(host->req);
755 /* check unwanted request call */
756 if (host->mg_do_intr)
759 del_timer(&host->timer);
761 sect_num = blk_rq_pos(req);
762 /* deal whole segments */
763 sect_cnt = blk_rq_sectors(req);
766 if (sect_num >= get_capacity(req->rq_disk) ||
767 ((sect_num + sect_cnt) >
768 get_capacity(req->rq_disk))) {
770 "%s: bad access: sector=%d, count=%d\n",
771 req->rq_disk->disk_name,
773 mg_end_request_cur(host, -EIO);
777 if (unlikely(!blk_fs_request(req))) {
778 mg_end_request_cur(host, -EIO);
782 if (!mg_issue_req(req, host, sect_num, sect_cnt))
787 static int mg_getgeo(struct block_device *bdev, struct hd_geometry *geo)
789 struct mg_host *host = bdev->bd_disk->private_data;
791 geo->cylinders = (unsigned short)host->cyls;
792 geo->heads = (unsigned char)host->heads;
793 geo->sectors = (unsigned char)host->sectors;
797 static struct block_device_operations mg_disk_ops = {
801 static int mg_suspend(struct platform_device *plat_dev, pm_message_t state)
803 struct mg_drv_data *prv_data = plat_dev->dev.platform_data;
804 struct mg_host *host = prv_data->host;
806 if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
809 if (!prv_data->use_polling)
810 outb(ATA_NIEN, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
812 outb(MG_CMD_SLEEP, (unsigned long)host->dev_base + MG_REG_COMMAND);
813 /* wait until mflash deep sleep */
816 if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD)) {
817 if (!prv_data->use_polling)
818 outb(0, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
825 static int mg_resume(struct platform_device *plat_dev)
827 struct mg_drv_data *prv_data = plat_dev->dev.platform_data;
828 struct mg_host *host = prv_data->host;
830 if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
833 outb(MG_CMD_WAKEUP, (unsigned long)host->dev_base + MG_REG_COMMAND);
834 /* wait until mflash wakeup */
837 if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD))
840 if (!prv_data->use_polling)
841 outb(0, (unsigned long)host->dev_base + MG_REG_DRV_CTRL);
846 static int mg_probe(struct platform_device *plat_dev)
848 struct mg_host *host;
849 struct resource *rsc;
850 struct mg_drv_data *prv_data = plat_dev->dev.platform_data;
854 printk(KERN_ERR "%s:%d fail (no driver_data)\n",
861 host = kzalloc(sizeof(struct mg_host), GFP_KERNEL);
863 printk(KERN_ERR "%s:%d fail (no memory for mg_host)\n",
868 host->major = MG_DISK_MAJ;
870 /* link each other */
871 prv_data->host = host;
872 host->dev = &plat_dev->dev;
875 rsc = platform_get_resource(plat_dev, IORESOURCE_MEM, 0);
877 printk(KERN_ERR "%s:%d platform_get_resource fail\n",
882 host->dev_base = ioremap(rsc->start , rsc->end + 1);
883 if (!host->dev_base) {
884 printk(KERN_ERR "%s:%d ioremap fail\n",
889 MG_DBG("dev_base = 0x%x\n", (u32)host->dev_base);
892 rsc = platform_get_resource_byname(plat_dev, IORESOURCE_IO,
895 printk(KERN_ERR "%s:%d get reset pin fail\n",
900 host->rst = rsc->start;
903 err = gpio_request(host->rst, MG_RST_PIN);
906 gpio_direction_output(host->rst, 1);
909 if (!(prv_data->dev_attr & MG_DEV_MASK))
912 if (prv_data->dev_attr != MG_BOOT_DEV) {
913 rsc = platform_get_resource_byname(plat_dev, IORESOURCE_IO,
916 printk(KERN_ERR "%s:%d get reset-out pin fail\n",
921 host->rstout = rsc->start;
922 err = gpio_request(host->rstout, MG_RSTOUT_PIN);
925 gpio_direction_input(host->rstout);
929 if (prv_data->dev_attr == MG_STORAGE_DEV) {
930 /* If POR seq. not yet finised, wait */
931 err = mg_wait_rstout(host->rstout, MG_TMAX_RSTOUT);
934 err = mg_disk_init(host);
936 printk(KERN_ERR "%s:%d fail (err code : %d)\n",
937 __func__, __LINE__, err);
943 /* get irq resource */
944 if (!prv_data->use_polling) {
945 host->irq = platform_get_irq(plat_dev, 0);
946 if (host->irq == -ENXIO) {
950 err = request_irq(host->irq, mg_irq,
951 IRQF_DISABLED | IRQF_TRIGGER_RISING,
954 printk(KERN_ERR "%s:%d fail (request_irq err=%d)\n",
955 __func__, __LINE__, err);
962 err = mg_get_disk_id(host);
964 printk(KERN_ERR "%s:%d fail (err code : %d)\n",
965 __func__, __LINE__, err);
970 err = register_blkdev(host->major, MG_DISK_NAME);
972 printk(KERN_ERR "%s:%d register_blkdev fail (err code : %d)\n",
973 __func__, __LINE__, err);
979 spin_lock_init(&host->lock);
981 if (prv_data->use_polling)
982 host->breq = blk_init_queue(mg_request_poll, &host->lock);
984 host->breq = blk_init_queue(mg_request, &host->lock);
988 printk(KERN_ERR "%s:%d (blk_init_queue) fail\n",
992 host->breq->queuedata = host;
994 /* mflash is random device, thanx for the noop */
995 elevator_exit(host->breq->elevator);
996 err = elevator_init(host->breq, "noop");
998 printk(KERN_ERR "%s:%d (elevator_init) fail\n",
1002 blk_queue_max_sectors(host->breq, MG_MAX_SECTS);
1003 blk_queue_hardsect_size(host->breq, MG_SECTOR_SIZE);
1005 init_timer(&host->timer);
1006 host->timer.function = mg_times_out;
1007 host->timer.data = (unsigned long)host;
1009 host->gd = alloc_disk(MG_DISK_MAX_PART);
1011 printk(KERN_ERR "%s:%d (alloc_disk) fail\n",
1012 __func__, __LINE__);
1016 host->gd->major = host->major;
1017 host->gd->first_minor = 0;
1018 host->gd->fops = &mg_disk_ops;
1019 host->gd->queue = host->breq;
1020 host->gd->private_data = host;
1021 sprintf(host->gd->disk_name, MG_DISK_NAME"a");
1023 set_capacity(host->gd, host->n_sectors);
1030 del_timer_sync(&host->timer);
1032 blk_cleanup_queue(host->breq);
1034 unregister_blkdev(MG_DISK_MAJ, MG_DISK_NAME);
1036 if (!prv_data->use_polling)
1037 free_irq(host->irq, host);
1039 gpio_free(host->rstout);
1041 gpio_free(host->rst);
1043 iounmap(host->dev_base);
1050 static int mg_remove(struct platform_device *plat_dev)
1052 struct mg_drv_data *prv_data = plat_dev->dev.platform_data;
1053 struct mg_host *host = prv_data->host;
1057 del_timer_sync(&host->timer);
1061 del_gendisk(host->gd);
1066 blk_cleanup_queue(host->breq);
1068 /* unregister blk device */
1069 unregister_blkdev(host->major, MG_DISK_NAME);
1072 if (!prv_data->use_polling)
1073 free_irq(host->irq, host);
1075 /* free reset-out pin */
1076 if (prv_data->dev_attr != MG_BOOT_DEV)
1077 gpio_free(host->rstout);
1081 gpio_free(host->rst);
1085 iounmap(host->dev_base);
1093 static struct platform_driver mg_disk_driver = {
1095 .remove = mg_remove,
1096 .suspend = mg_suspend,
1097 .resume = mg_resume,
1099 .name = MG_DEV_NAME,
1100 .owner = THIS_MODULE,
1104 /****************************************************************************
1108 ****************************************************************************/
1110 static int __init mg_init(void)
1112 printk(KERN_INFO "mGine mflash driver, (c) 2008 mGine Co.\n");
1113 return platform_driver_register(&mg_disk_driver);
1116 static void __exit mg_exit(void)
1118 printk(KERN_INFO "mflash driver : bye bye\n");
1119 platform_driver_unregister(&mg_disk_driver);
1122 module_init(mg_init);
1123 module_exit(mg_exit);
1125 MODULE_LICENSE("GPL");
1126 MODULE_AUTHOR("unsik Kim <donari75@gmail.com>");
1127 MODULE_DESCRIPTION("mGine m[g]flash device driver");