/* * 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 *)req->buffer; 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), req->buffer); Lines 1–500 of 1113. Load more
/* * 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 *)req->buffer; 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), req->buffer);