/* * drivers/block/mg_disk.c * * Support for the mGine m[g]flash IO mode. * Based on legacy hd.c * * (c) 2008 mGine Co.,LTD * (c) 2008 unsik Kim <donari75@gmail.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/fs.h> #include <linux/blkdev.h> #include <linux/hdreg.h> #include <linux/ata.h> #include <linux/interrupt.h> #include <linux/delay.h> #include <linux/platform_device.h> #include <linux/gpio.h> #include <linux/mg_disk.h> #include <linux/slab.h> #define MG_RES_SEC (CONFIG_MG_DISK_RES << 1) /* name for block device */ #define MG_DISK_NAME "mgd" #define MG_DISK_MAJ 0 #define MG_DISK_MAX_PART 16 #define MG_SECTOR_SIZE 512 #define MG_MAX_SECTS 256 /* Register offsets */ #define MG_BUFF_OFFSET 0x8000 #define MG_REG_OFFSET 0xC000 #define MG_REG_FEATURE (MG_REG_OFFSET + 2) /* write case */ #define MG_REG_ERROR (MG_REG_OFFSET + 2) /* read case */ #define MG_REG_SECT_CNT (MG_REG_OFFSET + 4) #define MG_REG_SECT_NUM (MG_REG_OFFSET + 6) #define MG_REG_CYL_LOW (MG_REG_OFFSET + 8) #define MG_REG_CYL_HIGH (MG_REG_OFFSET + 0xA) #define MG_REG_DRV_HEAD (MG_REG_OFFSET + 0xC) #define MG_REG_COMMAND (MG_REG_OFFSET + 0xE) /* write case */ #define MG_REG_STATUS (MG_REG_OFFSET + 0xE) /* read case */ #define MG_REG_DRV_CTRL (MG_REG_OFFSET + 0x10) #define MG_REG_BURST_CTRL (MG_REG_OFFSET + 0x12) /* handy status */ #define MG_STAT_READY (ATA_DRDY | ATA_DSC) #define MG_READY_OK(s) (((s) & (MG_STAT_READY | (ATA_BUSY | ATA_DF | \ ATA_ERR))) == MG_STAT_READY) /* error code for others */ #define MG_ERR_NONE 0 #define MG_ERR_TIMEOUT 0x100 #define MG_ERR_INIT_STAT 0x101 #define MG_ERR_TRANSLATION 0x102 #define MG_ERR_CTRL_RST 0x103 #define MG_ERR_INV_STAT 0x104 #define MG_ERR_RSTOUT 0x105 #define MG_MAX_ERRORS 6 /* Max read/write errors */ /* command */ #define MG_CMD_RD 0x20 #define MG_CMD_WR 0x30 #define MG_CMD_SLEEP 0x99 #define MG_CMD_WAKEUP 0xC3 #define MG_CMD_ID 0xEC #define MG_CMD_WR_CONF 0x3C #define MG_CMD_RD_CONF 0x40 /* operation mode */ #define MG_OP_CASCADE (1 << 0) #define MG_OP_CASCADE_SYNC_RD (1 << 1) #define MG_OP_CASCADE_SYNC_WR (1 << 2) #define MG_OP_INTERLEAVE (1 << 3) /* synchronous */ #define MG_BURST_LAT_4 (3 << 4) #define MG_BURST_LAT_5 (4 << 4) #define MG_BURST_LAT_6 (5 << 4) #define MG_BURST_LAT_7 (6 << 4) #define MG_BURST_LAT_8 (7 << 4) #define MG_BURST_LEN_4 (1 << 1) #define MG_BURST_LEN_8 (2 << 1) #define MG_BURST_LEN_16 (3 << 1) #define MG_BURST_LEN_32 (4 << 1) #define MG_BURST_LEN_CONT (0 << 1) /* timeout value (unit: ms) */ #define MG_TMAX_CONF_TO_CMD 1 #define MG_TMAX_WAIT_RD_DRQ 10 #define MG_TMAX_WAIT_WR_DRQ 500 #define MG_TMAX_RST_TO_BUSY 10 #define MG_TMAX_HDRST_TO_RDY 500 #define MG_TMAX_SWRST_TO_RDY 500 #define MG_TMAX_RSTOUT 3000 #define MG_DEV_MASK (MG_BOOT_DEV | MG_STORAGE_DEV | MG_STORAGE_DEV_SKIP_RST) /* main structure for mflash driver */ struct mg_host { struct device *dev; struct request_queue *breq; struct request *req; spinlock_t lock; struct gendisk *gd; struct timer_list timer; void (*mg_do_intr) (struct mg_host *); u16 id[ATA_ID_WORDS]; u16 cyls; u16 heads; u16 sectors; u32 n_sectors; u32 nres_sectors; void __iomem *dev_base; unsigned int irq; unsigned int rst; unsigned int rstout; u32 major; u32 error; }; /* * Debugging macro and defines */ #undef DO_MG_DEBUG #ifdef DO_MG_DEBUG # define MG_DBG(fmt, args...) \ printk(KERN_DEBUG "%s:%d "fmt, __func__, __LINE__, ##args) #else /* CONFIG_MG_DEBUG */ # define MG_DBG(fmt, args...) do { } while (0) #endif /* CONFIG_MG_DEBUG */ static void mg_request(struct request_queue *); static bool mg_end_request(struct mg_host *host, int err, unsigned int nr_bytes) { if (__blk_end_request(host->req, err, nr_bytes)) return true; host->req = NULL; return false; } static bool mg_end_request_cur(struct mg_host *host, int err) { return mg_end_request(host, err, blk_rq_cur_bytes(host->req)); } static void mg_dump_status(const char *msg, unsigned int stat, struct mg_host *host) { char *name = MG_DISK_NAME; if (host->req) name = host->req->rq_disk->disk_name; printk(KERN_ERR "%s: %s: status=0x%02x { ", name, msg, stat & 0xff); if (stat & ATA_BUSY) printk("Busy "); if (stat & ATA_DRDY) printk("DriveReady "); if (stat & ATA_DF) printk("WriteFault "); if (stat & ATA_DSC) printk("SeekComplete "); if (stat & ATA_DRQ) printk("DataRequest "); if (stat & ATA_CORR) printk("CorrectedError "); if (stat & ATA_ERR) printk("Error "); printk("}\n"); if ((stat & ATA_ERR) == 0) { host->error = 0; } else { host->error = inb((unsigned long)host->dev_base + MG_REG_ERROR); printk(KERN_ERR "%s: %s: error=0x%02x { ", name, msg, host->error & 0xff); if (host->error & ATA_BBK) printk("BadSector "); if (host->error & ATA_UNC) printk("UncorrectableError "); if (host->error & ATA_IDNF) printk("SectorIdNotFound "); if (host->error & ATA_ABORTED) printk("DriveStatusError "); if (host->error & ATA_AMNF) printk("AddrMarkNotFound "); printk("}"); if (host->error & (ATA_BBK | ATA_UNC | ATA_IDNF | ATA_AMNF)) { if (host->req) printk(", sector=%u", (unsigned int)blk_rq_pos(host->req)); } printk("\n"); } } static unsigned int mg_wait(struct mg_host *host, u32 expect, u32 msec) { u8 status; unsigned long expire, cur_jiffies; struct mg_drv_data *prv_data = host->dev->platform_data; host->error = MG_ERR_NONE; expire = jiffies + msecs_to_jiffies(msec); /* These 2 times dummy status read prevents reading invalid * status. A very little time (3 times of mflash operating clk) * is required for busy bit is set. Use dummy read instead of * busy wait, because mflash's PLL is machine dependent. */ if (prv_data->use_polling) { status = inb((unsigned long)host->dev_base + MG_REG_STATUS); status = inb((unsigned long)host->dev_base + MG_REG_STATUS); } status = inb((unsigned long)host->dev_base + MG_REG_STATUS); do { cur_jiffies = jiffies; if (status & ATA_BUSY) { if (expect == ATA_BUSY) break; } else { /* Check the error condition! */ if (status & ATA_ERR) { mg_dump_status("mg_wait", status, host); break; } if (expect == MG_STAT_READY) if (MG_READY_OK(status)) break; if (expect == ATA_DRQ) if (status & ATA_DRQ) break; } if (!msec) { mg_dump_status("not ready", status, host); return MG_ERR_INV_STAT; } status = inb((unsigned long)host->dev_base + MG_REG_STATUS); } while (time_before(cur_jiffies, expire)); if (time_after_eq(cur_jiffies, expire) && msec) host->error = MG_ERR_TIMEOUT; return host->error; } static unsigned int mg_wait_rstout(u32 rstout, u32 msec) { unsigned long expire; expire = jiffies + msecs_to_jiffies(msec); while (time_before(jiffies, expire)) { if (gpio_get_value(rstout) == 1) return MG_ERR_NONE; msleep(10); } return MG_ERR_RSTOUT; } static void mg_unexpected_intr(struct mg_host *host) { u32 status = inb((unsigned long)host->dev_base + MG_REG_STATUS); mg_dump_status("mg_unexpected_intr", status, host); } static irqreturn_t mg_irq(int irq, void *dev_id) { struct mg_host *host = dev_id; void (*handler)(struct mg_host *) = host->mg_do_intr; spin_lock(&host->lock); host->mg_do_intr = NULL; del_timer(&host->timer); if (!handler) handler = mg_unexpected_intr; handler(host); spin_unlock(&host->lock); return IRQ_HANDLED; } /* local copy of ata_id_string() */ static void mg_id_string(const u16 *id, unsigned char *s, unsigned int ofs, unsigned int len) { unsigned int c; BUG_ON(len & 1); while (len > 0) { c = id[ofs] >> 8; *s = c; s++; c = id[ofs] & 0xff; *s = c; s++; ofs++; len -= 2; } } /* local copy of ata_id_c_string() */ static void mg_id_c_string(const u16 *id, unsigned char *s, unsigned int ofs, unsigned int len) { unsigned char *p; mg_id_string(id, s, ofs, len - 1); p = s + strnlen(s, len - 1); while (p > s && p[-1] == ' ') p--; *p = '\0'; } static int mg_get_disk_id(struct mg_host *host) { u32 i; s32 err; const u16 *id = host->id; struct mg_drv_data *prv_data = host->dev->platform_data; char fwrev[ATA_ID_FW_REV_LEN + 1]; char model[ATA_ID_PROD_LEN + 1]; char serial[ATA_ID_SERNO_LEN + 1]; if (!prv_data->use_polling) outb(ATA_NIEN, (unsigned long)host->dev_base + MG_REG_DRV_CTRL); outb(MG_CMD_ID, (unsigned long)host->dev_base + MG_REG_COMMAND); err = mg_wait(host, ATA_DRQ, MG_TMAX_WAIT_RD_DRQ); if (err) return err; for (i = 0; i < (MG_SECTOR_SIZE >> 1); i++) host->id[i] = le16_to_cpu(inw((unsigned long)host->dev_base + MG_BUFF_OFFSET + i * 2)); outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND); err = mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD); if (err) return err; if ((id[ATA_ID_FIELD_VALID] & 1) == 0) return MG_ERR_TRANSLATION; host->n_sectors = ata_id_u32(id, ATA_ID_LBA_CAPACITY); host->cyls = id[ATA_ID_CYLS]; host->heads = id[ATA_ID_HEADS]; host->sectors = id[ATA_ID_SECTORS]; if (MG_RES_SEC && host->heads && host->sectors) { /* modify cyls, n_sectors */ host->cyls = (host->n_sectors - MG_RES_SEC) / host->heads / host->sectors; host->nres_sectors = host->n_sectors - host->cyls * host->heads * host->sectors; host->n_sectors -= host->nres_sectors; } mg_id_c_string(id, fwrev, ATA_ID_FW_REV, sizeof(fwrev)); mg_id_c_string(id, model, ATA_ID_PROD, sizeof(model)); mg_id_c_string(id, serial, ATA_ID_SERNO, sizeof(serial)); printk(KERN_INFO "mg_disk: model: %s\n", model); printk(KERN_INFO "mg_disk: firm: %.8s\n", fwrev); printk(KERN_INFO "mg_disk: serial: %s\n", serial); printk(KERN_INFO "mg_disk: %d + reserved %d sectors\n", host->n_sectors, host->nres_sectors); if (!prv_data->use_polling) outb(0, (unsigned long)host->dev_base + MG_REG_DRV_CTRL); return err; } static int mg_disk_init(struct mg_host *host) { struct mg_drv_data *prv_data = host->dev->platform_data; s32 err; u8 init_status; /* hdd rst low */ gpio_set_value(host->rst, 0); err = mg_wait(host, ATA_BUSY, MG_TMAX_RST_TO_BUSY); if (err) return err; /* hdd rst high */ gpio_set_value(host->rst, 1); err = mg_wait(host, MG_STAT_READY, MG_TMAX_HDRST_TO_RDY); if (err) return err; /* soft reset on */ outb(ATA_SRST | (prv_data->use_polling ? ATA_NIEN : 0), (unsigned long)host->dev_base + MG_REG_DRV_CTRL); err = mg_wait(host, ATA_BUSY, MG_TMAX_RST_TO_BUSY); if (err) return err; /* soft reset off */ outb(prv_data->use_polling ? ATA_NIEN : 0, (unsigned long)host->dev_base + MG_REG_DRV_CTRL); err = mg_wait(host, MG_STAT_READY, MG_TMAX_SWRST_TO_RDY); if (err) return err; init_status = inb((unsigned long)host->dev_base + MG_REG_STATUS) & 0xf; if (init_status == 0xf) return MG_ERR_INIT_STAT; return err; } static void mg_bad_rw_intr(struct mg_host *host) { if (host->req) if (++host->req->errors >= MG_MAX_ERRORS || host->error == MG_ERR_TIMEOUT) mg_end_request_cur(host, -EIO); } static unsigned int mg_out(struct mg_host *host, unsigned int sect_num, unsigned int sect_cnt, unsigned int cmd, void (*intr_addr)(struct mg_host *)) { struct mg_drv_data *prv_data = host->dev->platform_data; if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD)) return host->error; if (!prv_data->use_polling) { host->mg_do_intr = intr_addr; mod_timer(&host->timer, jiffies + 3 * HZ); } if (MG_RES_SEC) sect_num += MG_RES_SEC; outb((u8)sect_cnt, (unsigned long)host->dev_base + MG_REG_SECT_CNT); outb((u8)sect_num, (unsigned long)host->dev_base + MG_REG_SECT_NUM); outb((u8)(sect_num >> 8), (unsigned long)host->dev_base + MG_REG_CYL_LOW); outb((u8)(sect_num >> 16), (unsigned long)host->dev_base + MG_REG_CYL_HIGH); outb((u8)((sect_num >> 24) | ATA_LBA | ATA_DEVICE_OBS), (unsigned long)host->dev_base + MG_REG_DRV_HEAD); outb(cmd, (unsigned long)host->dev_base + MG_REG_COMMAND); return MG_ERR_NONE; } static void mg_read_one(struct mg_host *host, struct request *req) { u16 *buff = (u16 *)bio_data(req->bio); u32 i; for (i = 0; i < MG_SECTOR_SIZE >> 1; i++) *buff++ = inw((unsigned long)host->dev_base + MG_BUFF_OFFSET + (i << 1)); } static void mg_read(struct request *req) { struct mg_host *host = req->rq_disk->private_data; if (mg_out(host, blk_rq_pos(req), blk_rq_sectors(req), MG_CMD_RD, NULL) != MG_ERR_NONE) mg_bad_rw_intr(host); MG_DBG("requested %d sects (from %ld), buffer=0x%p\n", blk_rq_sectors(req), blk_rq_pos(req), bio_data(req->bio)); do { if (mg_wait(host, ATA_DRQ, MG_TMAX_WAIT_RD_DRQ) != MG_ERR_NONE) { mg_bad_rw_intr(host); return; } mg_read_one(host, req); outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND); } while (mg_end_request(host, 0, MG_SECTOR_SIZE)); } static void mg_write_one(struct mg_host *host, struct request *req) { u16 *buff = (u16 *)bio_data(req->bio); u32 i; for (i = 0; i < MG_SECTOR_SIZE >> 1; i++) outw(*buff++, (unsigned long)host->dev_base + MG_BUFF_OFFSET + (i << 1)); } static void mg_write(struct request *req) { struct mg_host *host = req->rq_disk->private_data; unsigned int rem = blk_rq_sectors(req); if (mg_out(host, blk_rq_pos(req), rem, MG_CMD_WR, NULL) != MG_ERR_NONE) { mg_bad_rw_intr(host); return; } MG_DBG("requested %d sects (from %ld), buffer=0x%p\n", rem, blk_rq_pos(req), bio_data(req->bio)); if (mg_wait(host, ATA_DRQ, MG_TMAX_WAIT_WR_DRQ) != MG_ERR_NONE) { mg_bad_rw_intr(host); return; } do { mg_write_one(host, req); outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND); rem--; if (rem > 1 && mg_wait(host, ATA_DRQ, MG_TMAX_WAIT_WR_DRQ) != MG_ERR_NONE) { mg_bad_rw_intr(host); return; } else if (mg_wait(host, MG_STAT_READY, MG_TMAX_WAIT_WR_DRQ) != MG_ERR_NONE) { mg_bad_rw_intr(host); return; } } while (mg_end_request(host, 0, MG_SECTOR_SIZE)); } static void mg_read_intr(struct mg_host *host) { struct request *req = host->req; u32 i; /* check status */ do { i = inb((unsigned long)host->dev_base + MG_REG_STATUS); if (i & ATA_BUSY) break; if (!MG_READY_OK(i)) break; if (i & ATA_DRQ) goto ok_to_read; } while (0); mg_dump_status("mg_read_intr", i, host); mg_bad_rw_intr(host); mg_request(host->breq); return; ok_to_read: mg_read_one(host, req); MG_DBG("sector %ld, remaining=%ld, buffer=0x%p\n", blk_rq_pos(req), blk_rq_sectors(req) - 1, bio_data(req->bio)); /* send read confirm */ outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND); if (mg_end_request(host, 0, MG_SECTOR_SIZE)) { /* set handler if read remains */ host->mg_do_intr = mg_read_intr; mod_timer(&host->timer, jiffies + 3 * HZ); } else /* goto next request */ mg_request(host->breq); } static void mg_write_intr(struct mg_host *host) { struct request *req = host->req; u32 i; bool rem; /* check status */ do { i = inb((unsigned long)host->dev_base + MG_REG_STATUS); if (i & ATA_BUSY) break; if (!MG_READY_OK(i)) break; if ((blk_rq_sectors(req) <= 1) || (i & ATA_DRQ)) goto ok_to_write; } while (0); mg_dump_status("mg_write_intr", i, host); mg_bad_rw_intr(host); mg_request(host->breq); return; ok_to_write: if ((rem = mg_end_request(host, 0, MG_SECTOR_SIZE))) { /* write 1 sector and set handler if remains */ mg_write_one(host, req); MG_DBG("sector %ld, remaining=%ld, buffer=0x%p\n", blk_rq_pos(req), blk_rq_sectors(req), bio_data(req->bio)); host->mg_do_intr = mg_write_intr; mod_timer(&host->timer, jiffies + 3 * HZ); } /* send write confirm */ outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND); if (!rem) mg_request(host->breq); } static void mg_times_out(unsigned long data) { struct mg_host *host = (struct mg_host *)data; char *name; spin_lock_irq(&host->lock); if (!host->req) goto out_unlock; host->mg_do_intr = NULL; name = host->req->rq_disk->disk_name; printk(KERN_DEBUG "%s: timeout\n", name); host->error = MG_ERR_TIMEOUT; mg_bad_rw_intr(host); out_unlock: mg_request(host->breq); spin_unlock_irq(&host->lock); } static void mg_request_poll(struct request_queue *q) { struct mg_host *host = q->queuedata; while (1) { if (!host->req) { host->req = blk_fetch_request(q); if (!host->req) break; } if (unlikely(host->req->cmd_type != REQ_TYPE_FS)) { mg_end_request_cur(host, -EIO); continue; } if (rq_data_dir(host->req) == READ) mg_read(host->req); else mg_write(host->req); } } static unsigned int mg_issue_req(struct request *req, struct mg_host *host, unsigned int sect_num, unsigned int sect_cnt) { switch (rq_data_dir(req)) { case READ: if (mg_out(host, sect_num, sect_cnt, MG_CMD_RD, &mg_read_intr) != MG_ERR_NONE) { mg_bad_rw_intr(host); return host->error; } break; case WRITE: /* TODO : handler */ outb(ATA_NIEN, (unsigned long)host->dev_base + MG_REG_DRV_CTRL); if (mg_out(host, sect_num, sect_cnt, MG_CMD_WR, &mg_write_intr) != MG_ERR_NONE) { mg_bad_rw_intr(host); return host->error; } del_timer(&host->timer); mg_wait(host, ATA_DRQ, MG_TMAX_WAIT_WR_DRQ); outb(0, (unsigned long)host->dev_base + MG_REG_DRV_CTRL); if (host->error) { mg_bad_rw_intr(host); return host->error; } mg_write_one(host, req); mod_timer(&host->timer, jiffies + 3 * HZ); outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND); break; } return MG_ERR_NONE; } /* This function also called from IRQ context */ static void mg_request(struct request_queue *q) { struct mg_host *host = q->queuedata; struct request *req; u32 sect_num, sect_cnt; while (1) { if (!host->req) { host->req = blk_fetch_request(q); if (!host->req) break; } req = host->req; /* check unwanted request call */ if (host->mg_do_intr) return; del_timer(&host->timer); sect_num = blk_rq_pos(req); /* deal whole segments */ sect_cnt = blk_rq_sectors(req); /* sanity check */ if (sect_num >= get_capacity(req->rq_disk) || ((sect_num + sect_cnt) > get_capacity(req->rq_disk))) { printk(KERN_WARNING "%s: bad access: sector=%d, count=%d\n", req->rq_disk->disk_name, sect_num, sect_cnt); mg_end_request_cur(host, -EIO); continue; } if (unlikely(req->cmd_type != REQ_TYPE_FS)) { mg_end_request_cur(host, -EIO); continue; } if (!mg_issue_req(req, host, sect_num, sect_cnt)) return; } } static int mg_getgeo(struct block_device *bdev, struct hd_geometry *geo) { struct mg_host *host = bdev->bd_disk->private_data; geo->cylinders = (unsigned short)host->cyls; geo->heads = (unsigned char)host->heads; geo->sectors = (unsigned char)host->sectors; return 0; } static const struct block_device_operations mg_disk_ops = { .getgeo = mg_getgeo }; #ifdef CONFIG_PM_SLEEP static int mg_suspend(struct device *dev) { struct mg_drv_data *prv_data = dev->platform_data; struct mg_host *host = prv_data->host; if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD)) return -EIO; if (!prv_data->use_polling) outb(ATA_NIEN, (unsigned long)host->dev_base + MG_REG_DRV_CTRL); outb(MG_CMD_SLEEP, (unsigned long)host->dev_base + MG_REG_COMMAND); /* wait until mflash deep sleep */ msleep(1); if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD)) { if (!prv_data->use_polling) outb(0, (unsigned long)host->dev_base + MG_REG_DRV_CTRL); return -EIO; } return 0; } static int mg_resume(struct device *dev) { struct mg_drv_data *prv_data = dev->platform_data; struct mg_host *host = prv_data->host; if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD)) return -EIO; outb(MG_CMD_WAKEUP, (unsigned long)host->dev_base + MG_REG_COMMAND); /* wait until mflash wakeup */ msleep(1); if (mg_wait(host, MG_STAT_READY, MG_TMAX_CONF_TO_CMD)) return -EIO; if (!prv_data->use_polling) outb(0, (unsigned long)host->dev_base + MG_REG_DRV_CTRL); return 0; } #endif static SIMPLE_DEV_PM_OPS(mg_pm, mg_suspend, mg_resume); static int mg_probe(struct platform_device *plat_dev) { struct mg_host *host; struct resource *rsc; struct mg_drv_data *prv_data = plat_dev->dev.platform_data; int err = 0; if (!prv_data) { printk(KERN_ERR "%s:%d fail (no driver_data)\n", __func__, __LINE__); err = -EINVAL; goto probe_err; } /* alloc mg_host */ host = kzalloc(sizeof(struct mg_host), GFP_KERNEL); if (!host) { printk(KERN_ERR "%s:%d fail (no memory for mg_host)\n", __func__, __LINE__); err = -ENOMEM; goto probe_err; } host->major = MG_DISK_MAJ; /* link each other */ prv_data->host = host; host->dev = &plat_dev->dev; /* io remap */ rsc = platform_get_resource(plat_dev, IORESOURCE_MEM, 0); if (!rsc) { printk(KERN_ERR "%s:%d platform_get_resource fail\n", __func__, __LINE__); err = -EINVAL; goto probe_err_2; } host->dev_base = ioremap(rsc->start, resource_size(rsc)); if (!host->dev_base) { printk(KERN_ERR "%s:%d ioremap fail\n", __func__, __LINE__); err = -EIO; goto probe_err_2; } MG_DBG("dev_base = 0x%x\n", (u32)host->dev_base); /* get reset pin */ rsc = platform_get_resource_byname(plat_dev, IORESOURCE_IO, MG_RST_PIN); if (!rsc) { printk(KERN_ERR "%s:%d get reset pin fail\n", __func__, __LINE__); err = -EIO; goto probe_err_3; } host->rst = rsc->start; /* init rst pin */ err = gpio_request(host->rst, MG_RST_PIN); if (err) goto probe_err_3; gpio_direction_output(host->rst, 1); /* reset out pin */ if (!(prv_data->dev_attr & MG_DEV_MASK)) { err = -EINVAL; goto probe_err_3a; } if (prv_data->dev_attr != MG_BOOT_DEV) { rsc = platform_get_resource_byname(plat_dev, IORESOURCE_IO, MG_RSTOUT_PIN); if (!rsc) { printk(KERN_ERR "%s:%d get reset-out pin fail\n", __func__, __LINE__); err = -EIO; goto probe_err_3a; } host->rstout = rsc->start; err = gpio_request(host->rstout, MG_RSTOUT_PIN); if (err) goto probe_err_3a; gpio_direction_input(host->rstout); } /* disk reset */ if (prv_data->dev_attr == MG_STORAGE_DEV) { /* If POR seq. not yet finished, wait */ err = mg_wait_rstout(host->rstout, MG_TMAX_RSTOUT); if (err) goto probe_err_3b; err = mg_disk_init(host); if (err) { printk(KERN_ERR "%s:%d fail (err code : %d)\n", __func__, __LINE__, err); err = -EIO; goto probe_err_3b; } } /* get irq resource */ if (!prv_data->use_polling) { host->irq = platform_get_irq(plat_dev, 0); if (host->irq == -ENXIO) { err = host->irq; goto probe_err_3b; } err = request_irq(host->irq, mg_irq, IRQF_TRIGGER_RISING, MG_DEV_NAME, host); if (err) { printk(KERN_ERR "%s:%d fail (request_irq err=%d)\n", __func__, __LINE__, err); goto probe_err_3b; } } /* get disk id */ err = mg_get_disk_id(host); if (err) { printk(KERN_ERR "%s:%d fail (err code : %d)\n", __func__, __LINE__, err); err = -EIO; goto probe_err_4; } err = register_blkdev(host->major, MG_DISK_NAME); if (err < 0) { printk(KERN_ERR "%s:%d register_blkdev fail (err code : %d)\n", __func__, __LINE__, err); goto probe_err_4; } if (!host->major) host->major = err; spin_lock_init(&host->lock); if (prv_data->use_polling) host->breq = blk_init_queue(mg_request_poll, &host->lock); else host->breq = blk_init_queue(mg_request, &host->lock); if (!host->breq) { err = -ENOMEM; printk(KERN_ERR "%s:%d (blk_init_queue) fail\n", __func__, __LINE__); goto probe_err_5; } host->breq->queuedata = host; /* mflash is random device, thanx for the noop */ err = elevator_change(host->breq, "noop"); if (err) { printk(KERN_ERR "%s:%d (elevator_init) fail\n", __func__, __LINE__); goto probe_err_6; } blk_queue_max_hw_sectors(host->breq, MG_MAX_SECTS); blk_queue_logical_block_size(host->breq, MG_SECTOR_SIZE); init_timer(&host->timer); host->timer.function = mg_times_out; host->timer.data = (unsigned long)host; host->gd = alloc_disk(MG_DISK_MAX_PART); if (!host->gd) { printk(KERN_ERR "%s:%d (alloc_disk) fail\n", __func__, __LINE__); err = -ENOMEM; goto probe_err_7; } host->gd->major = host->major; host->gd->first_minor = 0; host->gd->fops = &mg_disk_ops; host->gd->queue = host->breq; host->gd->private_data = host; sprintf(host->gd->disk_name, MG_DISK_NAME"a"); set_capacity(host->gd, host->n_sectors); add_disk(host->gd); return err; probe_err_7: del_timer_sync(&host->timer); probe_err_6: blk_cleanup_queue(host->breq); probe_err_5: unregister_blkdev(MG_DISK_MAJ, MG_DISK_NAME); probe_err_4: if (!prv_data->use_polling) free_irq(host->irq, host); probe_err_3b: gpio_free(host->rstout); probe_err_3a: gpio_free(host->rst); probe_err_3: iounmap(host->dev_base); probe_err_2: kfree(host); probe_err: return err; } static int mg_remove(struct platform_device *plat_dev) { struct mg_drv_data *prv_data = plat_dev->dev.platform_data; struct mg_host *host = prv_data->host; int err = 0; /* delete timer */ del_timer_sync(&host->timer); /* remove disk */ if (host->gd) { del_gendisk(host->gd); put_disk(host->gd); } /* remove queue */ if (host->breq) blk_cleanup_queue(host->breq); /* unregister blk device */ unregister_blkdev(host->major, MG_DISK_NAME); /* free irq */ if (!prv_data->use_polling) free_irq(host->irq, host); /* free reset-out pin */ if (prv_data->dev_attr != MG_BOOT_DEV) gpio_free(host->rstout); /* free rst pin */ if (host->rst) gpio_free(host->rst); /* unmap io */ if (host->dev_base) iounmap(host->dev_base); /* free mg_host */ kfree(host); return err; } static struct platform_driver mg_disk_driver = { .probe = mg_probe, .remove = mg_remove, .driver = { .name = MG_DEV_NAME, .owner = THIS_MODULE, .pm = &mg_pm, } }; /**************************************************************************** * * Module stuff * ****************************************************************************/ static int __init mg_init(void) { printk(KERN_INFO "mGine mflash driver, (c) 2008 mGine Co.\n"); return platform_driver_register(&mg_disk_driver); } static void __exit mg_exit(void) { printk(KERN_INFO "mflash driver : bye bye\n"); platform_driver_unregister(&mg_disk_driver); } module_init(mg_init); module_exit(mg_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("unsik Kim <donari75@gmail.com>"); MODULE_DESCRIPTION("mGine m[g]flash device driver");