#include <linux/fs.h>
#include <linux/blkdev.h>
#include <linux/hdreg.h>
-#include <linux/libata.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>
#define MG_RES_SEC (CONFIG_MG_DISK_RES << 1)
+/* name for block device */
+#define MG_DISK_NAME "mgd"
+/* name for platform device */
+#define MG_DEV_NAME "mg_disk"
+
+#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_STORAGE_BUFFER_SIZE 0x200
+#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)
+
+/* "Drive Select/Head Register" bit values */
+#define MG_REG_HEAD_MUST_BE_ON 0xA0 /* These 2 bits are always on */
+#define MG_REG_HEAD_DRIVE_MASTER (0x00 | MG_REG_HEAD_MUST_BE_ON)
+#define MG_REG_HEAD_DRIVE_SLAVE (0x10 | MG_REG_HEAD_MUST_BE_ON)
+#define MG_REG_HEAD_LBA_MODE (0x40 | MG_REG_HEAD_MUST_BE_ON)
+
+
+/* "Device Control Register" bit values */
+#define MG_REG_CTRL_INTR_ENABLE 0x0
+#define MG_REG_CTRL_INTR_DISABLE (0x1<<1)
+#define MG_REG_CTRL_RESET (0x1<<2)
+#define MG_REG_CTRL_INTR_POLA_ACTIVE_HIGH 0x0
+#define MG_REG_CTRL_INTR_POLA_ACTIVE_LOW (0x1<<4)
+#define MG_REG_CTRL_DPD_POLA_ACTIVE_LOW 0x0
+#define MG_REG_CTRL_DPD_POLA_ACTIVE_HIGH (0x1<<5)
+#define MG_REG_CTRL_DPD_DISABLE 0x0
+#define MG_REG_CTRL_DPD_ENABLE (0x1<<6)
+
+/* Status register bit */
+/* error bit in status register */
+#define MG_REG_STATUS_BIT_ERROR 0x01
+/* corrected error in status register */
+#define MG_REG_STATUS_BIT_CORRECTED_ERROR 0x04
+/* data request bit in status register */
+#define MG_REG_STATUS_BIT_DATA_REQ 0x08
+/* DSC - Drive Seek Complete */
+#define MG_REG_STATUS_BIT_SEEK_DONE 0x10
+/* DWF - Drive Write Fault */
+#define MG_REG_STATUS_BIT_WRITE_FAULT 0x20
+#define MG_REG_STATUS_BIT_READY 0x40
+#define MG_REG_STATUS_BIT_BUSY 0x80
+
+/* handy status */
+#define MG_STAT_READY (MG_REG_STATUS_BIT_READY | MG_REG_STATUS_BIT_SEEK_DONE)
+#define MG_READY_OK(s) (((s) & (MG_STAT_READY | \
+ (MG_REG_STATUS_BIT_BUSY | \
+ MG_REG_STATUS_BIT_WRITE_FAULT | \
+ MG_REG_STATUS_BIT_ERROR))) == MG_STAT_READY)
+
+/* Error register */
+#define MG_REG_ERR_AMNF 0x01
+#define MG_REG_ERR_ABRT 0x04
+#define MG_REG_ERR_IDNF 0x10
+#define MG_REG_ERR_UNC 0x40
+#define MG_REG_ERR_BBK 0x80
+
+/* 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
+
+/* device attribution */
+/* use mflash as boot device */
+#define MG_BOOT_DEV (1 << 0)
+/* use mflash as storage device */
+#define MG_STORAGE_DEV (1 << 1)
+/* same as MG_STORAGE_DEV, but bootloader already done reset sequence */
+#define MG_STORAGE_DEV_SKIP_RST (1 << 2)
+
+#define MG_DEV_MASK (MG_BOOT_DEV | MG_STORAGE_DEV | MG_STORAGE_DEV_SKIP_RST)
+
+/* names of GPIO resource */
+#define MG_RST_PIN "mg_rst"
+/* except MG_BOOT_DEV, reset-out pin should be assigned */
+#define MG_RSTOUT_PIN "mg_rstout"
+
+/* private driver data */
+struct mg_drv_data {
+ /* disk resource */
+ u32 use_polling;
+
+ /* device attribution */
+ u32 dev_attr;
+
+ /* internally used */
+ struct mg_host *host;
+};
+
+/* main structure for mflash driver */
+struct mg_host {
+ struct device *dev;
+
+ struct request_queue *breq;
+ 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 void mg_dump_status(const char *msg, unsigned int stat,
if (host->breq) {
req = elv_next_request(host->breq);
if (req)
- printk(", sector=%ld", req->sector);
+ printk(", sector=%u", (u32)req->sector);
}
}
struct mg_host *host = dev_id;
void (*handler)(struct mg_host *) = host->mg_do_intr;
- host->mg_do_intr = 0;
+ 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;
host->n_sectors -= host->nres_sectors;
}
- ata_id_c_string(id, fwrev, ATA_ID_FW_REV, sizeof(fwrev));
- ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
- ata_id_c_string(id, serial, ATA_ID_SERNO, sizeof(serial));
+ 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);
if (req != NULL)
if (++req->errors >= MG_MAX_ERRORS ||
host->error == MG_ERR_TIMEOUT)
- end_request(req, 0);
+ __blk_end_request_cur(req, -EIO);
}
static unsigned int mg_out(struct mg_host *host,
static void mg_read(struct request *req)
{
- u32 remains, j;
+ u32 j;
struct mg_host *host = req->rq_disk->private_data;
- remains = req->nr_sectors;
-
- if (mg_out(host, req->sector, req->nr_sectors, MG_CMD_RD, 0) !=
+ if (mg_out(host, req->sector, req->nr_sectors, MG_CMD_RD, NULL) !=
MG_ERR_NONE)
mg_bad_rw_intr(host);
MG_DBG("requested %d sects (from %ld), buffer=0x%p\n",
- remains, req->sector, req->buffer);
+ req->nr_sectors, req->sector, req->buffer);
+
+ do {
+ u16 *buff = (u16 *)req->buffer;
- while (remains) {
if (mg_wait(host, MG_REG_STATUS_BIT_DATA_REQ,
MG_TMAX_WAIT_RD_DRQ) != MG_ERR_NONE) {
mg_bad_rw_intr(host);
return;
}
- for (j = 0; j < MG_SECTOR_SIZE >> 1; j++) {
- *(u16 *)req->buffer =
- inw((unsigned long)host->dev_base +
- MG_BUFF_OFFSET + (j << 1));
- req->buffer += 2;
- }
-
- req->sector++;
- req->errors = 0;
- remains = --req->nr_sectors;
- --req->current_nr_sectors;
-
- if (req->current_nr_sectors <= 0) {
- MG_DBG("remain : %d sects\n", remains);
- end_request(req, 1);
- if (remains > 0)
- req = elv_next_request(host->breq);
- }
+ for (j = 0; j < MG_SECTOR_SIZE >> 1; j++)
+ *buff++ = inw((unsigned long)host->dev_base +
+ MG_BUFF_OFFSET + (j << 1));
outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base +
MG_REG_COMMAND);
- }
+ } while (__blk_end_request(req, 0, MG_SECTOR_SIZE));
}
static void mg_write(struct request *req)
{
- u32 remains, j;
+ u32 j;
struct mg_host *host = req->rq_disk->private_data;
- remains = req->nr_sectors;
-
- if (mg_out(host, req->sector, req->nr_sectors, MG_CMD_WR, 0) !=
+ if (mg_out(host, req->sector, req->nr_sectors, MG_CMD_WR, NULL) !=
MG_ERR_NONE) {
mg_bad_rw_intr(host);
return;
}
-
MG_DBG("requested %d sects (from %ld), buffer=0x%p\n",
- remains, req->sector, req->buffer);
- while (remains) {
+ req->nr_sectors, req->sector, req->buffer);
+
+ do {
+ u16 *buff = (u16 *)req->buffer;
+
if (mg_wait(host, MG_REG_STATUS_BIT_DATA_REQ,
MG_TMAX_WAIT_WR_DRQ) != MG_ERR_NONE) {
mg_bad_rw_intr(host);
return;
}
- for (j = 0; j < MG_SECTOR_SIZE >> 1; j++) {
- outw(*(u16 *)req->buffer,
- (unsigned long)host->dev_base +
- MG_BUFF_OFFSET + (j << 1));
- req->buffer += 2;
- }
- req->sector++;
- remains = --req->nr_sectors;
- --req->current_nr_sectors;
-
- if (req->current_nr_sectors <= 0) {
- MG_DBG("remain : %d sects\n", remains);
- end_request(req, 1);
- if (remains > 0)
- req = elv_next_request(host->breq);
- }
+ for (j = 0; j < MG_SECTOR_SIZE >> 1; j++)
+ outw(*buff++, (unsigned long)host->dev_base +
+ MG_BUFF_OFFSET + (j << 1));
outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base +
MG_REG_COMMAND);
- }
+ } while (__blk_end_request(req, 0, MG_SECTOR_SIZE));
}
static void mg_read_intr(struct mg_host *host)
{
u32 i;
+ u16 *buff;
struct request *req;
/* check status */
ok_to_read:
/* get current segment of request */
req = elv_next_request(host->breq);
+ buff = (u16 *)req->buffer;
/* read 1 sector */
- for (i = 0; i < MG_SECTOR_SIZE >> 1; i++) {
- *(u16 *)req->buffer =
- inw((unsigned long)host->dev_base + MG_BUFF_OFFSET +
- (i << 1));
- req->buffer += 2;
- }
+ for (i = 0; i < MG_SECTOR_SIZE >> 1; i++)
+ *buff++ = inw((unsigned long)host->dev_base + MG_BUFF_OFFSET +
+ (i << 1));
- /* manipulate request */
MG_DBG("sector %ld, remaining=%ld, buffer=0x%p\n",
req->sector, req->nr_sectors - 1, req->buffer);
- req->sector++;
- req->errors = 0;
- i = --req->nr_sectors;
- --req->current_nr_sectors;
-
- /* let know if current segment done */
- if (req->current_nr_sectors <= 0)
- end_request(req, 1);
-
- /* set handler if read remains */
- if (i > 0) {
- host->mg_do_intr = mg_read_intr;
- mod_timer(&host->timer, jiffies + 3 * HZ);
- }
-
/* send read confirm */
outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND);
- /* goto next request */
- if (!i)
+ if (__blk_end_request(req, 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);
}
u32 i, j;
u16 *buff;
struct request *req;
+ bool rem;
/* get current segment of request */
req = elv_next_request(host->breq);
return;
ok_to_write:
- /* manipulate request */
- req->sector++;
- i = --req->nr_sectors;
- --req->current_nr_sectors;
- req->buffer += MG_SECTOR_SIZE;
-
- /* let know if current segment or all done */
- if (!i || (req->bio && req->current_nr_sectors <= 0))
- end_request(req, 1);
-
- /* write 1 sector and set handler if remains */
- if (i > 0) {
+ if ((rem = __blk_end_request(req, 0, MG_SECTOR_SIZE))) {
+ /* write 1 sector and set handler if remains */
buff = (u16 *)req->buffer;
for (j = 0; j < MG_STORAGE_BUFFER_SIZE >> 1; j++) {
outw(*buff, (unsigned long)host->dev_base +
/* send write confirm */
outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND);
- if (!i)
+ if (!rem)
mg_request(host->breq);
}
char *name;
struct request *req;
+ spin_lock_irq(&host->lock);
+
req = elv_next_request(host->breq);
if (!req)
- return;
+ goto out_unlock;
host->mg_do_intr = NULL;
mg_bad_rw_intr(host);
mg_request(host->breq);
+out_unlock:
+ spin_unlock_irq(&host->lock);
}
static void mg_request_poll(struct request_queue *q)
case WRITE:
mg_write(req);
break;
- default:
- printk(KERN_WARNING "%s:%d unknown command\n",
- __func__, __LINE__);
- end_request(req, 0);
- break;
}
}
}
outb(MG_CMD_WR_CONF, (unsigned long)host->dev_base +
MG_REG_COMMAND);
break;
- default:
- printk(KERN_WARNING "%s:%d unknown command\n",
- __func__, __LINE__);
- end_request(req, 0);
- break;
}
return MG_ERR_NONE;
}
"%s: bad access: sector=%d, count=%d\n",
req->rq_disk->disk_name,
sect_num, sect_cnt);
- end_request(req, 0);
+ __blk_end_request_cur(req, -EIO);
continue;
}
projects / platform / kernel / linux-starfive.git / blobdiff