diff options
Diffstat (limited to 'target/linux/rb532/files-2.6.24/drivers/block/rb500/ata.c')
| -rw-r--r-- | target/linux/rb532/files-2.6.24/drivers/block/rb500/ata.c | 487 |
1 files changed, 0 insertions, 487 deletions
diff --git a/target/linux/rb532/files-2.6.24/drivers/block/rb500/ata.c b/target/linux/rb532/files-2.6.24/drivers/block/rb500/ata.c deleted file mode 100644 index 31e6782fa4..0000000000 --- a/target/linux/rb532/files-2.6.24/drivers/block/rb500/ata.c +++ /dev/null @@ -1,487 +0,0 @@ -/* CF-mips driver - This is a block driver for the direct (mmaped) interface to the CF-slot, - found in Routerboard.com's RB532 board - See SDK provided from routerboard.com. - - Module adapted By P.Christeas <p_christeas@yahoo.com>, 2005-6. - Cleaned up and adapted to platform_device by Felix Fietkau <nbd@openwrt.org> - - This work is redistributed under the terms of the GNU General Public License. -*/ - -#include <linux/kernel.h> /* printk() */ -#include <linux/module.h> /* module to be loadable */ -#include <linux/delay.h> -#include <linux/sched.h> -#include <linux/pci.h> -#include <linux/ioport.h> /* request_mem_region() */ - -#include <asm/gpio.h> -#include <asm/unaligned.h> /* ioremap() */ -#include <asm/io.h> /* ioremap() */ -#include <asm/rc32434/rb.h> - -#include "ata.h" - -#define REQUEST_MEM_REGION 0 -#define DEBUG 1 - -#if DEBUG -#define DEBUGP printk -#else -#define DEBUGP(format, args...) -#endif - -#define SECS 1000000 /* unit for wait_not_busy() is 1us */ - -unsigned cf_head = 0; -unsigned cf_cyl = 0; -unsigned cf_spt = 0; -unsigned cf_sectors = 0; -static unsigned cf_block_size = 1; -static void *baddr = 0; - -#define DBUF32 ((volatile u32 *)((unsigned long)dev->baddr | ATA_DBUF_OFFSET)) - - -static void cf_do_tasklet(unsigned long dev_l); - - -static inline void wareg(u8 val, unsigned reg, struct cf_mips_dev* dev) -{ - writeb(val, dev->baddr + ATA_REG_OFFSET + reg); -} - -static inline u8 rareg(unsigned reg, struct cf_mips_dev* dev) -{ - return readb(dev->baddr + ATA_REG_OFFSET + reg); -} - -static inline int cfrdy(struct cf_mips_dev *dev) -{ - return gpio_get_value(dev->pin); -} - -static inline void prepare_cf_irq(struct cf_mips_dev *dev) -{ - rb500_gpio_set_int_level(1, dev->pin); /* interrupt on cf ready (not busy) */ - rb500_gpio_set_int_status(0, dev->pin); /* clear interrupt status */ -} - -static inline int cf_present(struct cf_mips_dev* dev) -{ - /* TODO: read and configure CIS into memory mapped mode - * TODO: parse CISTPL_CONFIG on CF+ cards to get base address (0x200) - * TODO: maybe adjust power saving setting for Hitachi Microdrive - */ - int i; - - /* setup CFRDY GPIO as input */ - rb500_gpio_set_func(dev->pin, 0); - gpio_direction_input(dev->pin); - - for (i = 0; i < 0x10; ++i) { - if (rareg(i,dev) != 0xff) - return 1; - } - return 0; -} - -static inline int is_busy(struct cf_mips_dev *dev) -{ - return !cfrdy(dev); -} - -static int wait_not_busy(int to_us, int wait_for_busy,struct cf_mips_dev *dev) -{ - int us_passed = 0; - if (wait_for_busy && !is_busy(dev)) { - /* busy must appear within 400ns, - * but it may dissapear before we see it - * => must not wait for busy in a loop - */ - ndelay(400); - } - - do { - if (us_passed) - udelay(1); /* never reached in async mode */ - if (!is_busy(dev)) { - if (us_passed > 1 * SECS) { - printk(KERN_WARNING "cf-mips: not busy ok (after %dus)" - ", status 0x%02x\n", us_passed, (unsigned) rareg(ATA_REG_ST,dev)); - } - return CF_TRANS_OK; - } - if (us_passed == 1 * SECS) { - printk(KERN_WARNING "cf-mips: wait not busy %dus..\n", to_us); - } - if (dev->async_mode) { - dev->to_timer.expires = jiffies + (to_us * HZ / SECS); - dev->irq_enable_time = jiffies; - prepare_cf_irq(dev); - if (is_busy(dev)) { - add_timer(&dev->to_timer); - enable_irq(dev->irq); - return CF_TRANS_IN_PROGRESS; - } - continue; - } - ++us_passed; - } while (us_passed < to_us); - - printk(KERN_ERR "cf-mips: wait not busy timeout (%dus)" - ", status 0x%02x, state %d\n", - to_us, (unsigned) rareg(ATA_REG_ST,dev), dev->tstate); - return CF_TRANS_FAILED; -} - -static irqreturn_t cf_irq_handler(int irq, void *dev_id) -{ - /* While tasklet has not disabled irq, irq will be retried all the time - * because of ILEVEL matching GPIO pin status => deadlock. - * To avoid this, we change ILEVEL to 0. - */ - struct cf_mips_dev *dev=dev_id; - - rb500_gpio_set_int_level(0, dev->pin); - rb500_gpio_set_int_status(0, dev->pin); - - del_timer(&dev->to_timer); - tasklet_schedule(&dev->tasklet); - return IRQ_HANDLED; -} - -static int do_reset(struct cf_mips_dev *dev) -{ - printk(KERN_INFO "cf-mips: resetting..\n"); - - wareg(ATA_REG_DC_SRST, ATA_REG_DC,dev); - udelay(1); /* FIXME: how long should we wait here? */ - wareg(0, ATA_REG_DC,dev); - - return wait_not_busy(30 * SECS, 1,dev); -} - -static int set_multiple(struct cf_mips_dev *dev) -{ - if (dev->block_size <= 1) - return CF_TRANS_OK; - - wareg(dev->block_size, ATA_REG_SC,dev); - wareg(ATA_REG_DH_BASE | ATA_REG_DH_LBA, ATA_REG_DH,dev); - wareg(ATA_CMD_SET_MULTIPLE, ATA_REG_CMD,dev); - - return wait_not_busy(10 * SECS, 1,dev); -} - -static int set_cmd(struct cf_mips_dev *dev) -{ - //DEBUGP(KERN_INFO "cf-mips: ata cmd 0x%02x\n", dev->tcmd); - // sector_count should be <=24 bits.. - BUG_ON(dev->tsect_start>=0x10000000); - // This way, it addresses 2^24 * 512 = 128G - - if (dev->tsector_count) { - wareg(dev->tsector_count & 0xff, ATA_REG_SC,dev); - wareg(dev->tsect_start & 0xff, ATA_REG_SN,dev); - wareg((dev->tsect_start >> 8) & 0xff, ATA_REG_CL,dev); - wareg((dev->tsect_start >> 16) & 0xff, ATA_REG_CH,dev); - } - wareg(((dev->tsect_start >> 24) & 0x0f) | ATA_REG_DH_BASE | ATA_REG_DH_LBA, - ATA_REG_DH,dev); /* select drive on all commands */ - wareg(dev->tcmd, ATA_REG_CMD,dev); - return wait_not_busy(10 * SECS, 1,dev); -} - -static int do_trans(struct cf_mips_dev *dev) -{ - int res; - unsigned st; - int transfered; - - //printk("do_trans: %d sectors left\n",dev->tsectors_left); - while (dev->tsectors_left) { - transfered = 0; - - st = rareg(ATA_REG_ST,dev); - if (!(st & ATA_REG_ST_DRQ)) { - printk(KERN_ERR "cf-mips: do_trans without DRQ (status 0x%x)!\n", st); - if (st & ATA_REG_ST_ERR) { - int errId = rareg(ATA_REG_ERR,dev); - printk(KERN_ERR "cf-mips: %s error, status 0x%x, errid 0x%x\n", - (dev->tread ? "read" : "write"), st, errId); - } - return CF_TRANS_FAILED; - } - do { /* Fill/read the buffer one block */ - u32 *qbuf, *qend; - qbuf = (u32 *)dev->tbuf; - qend = qbuf + CF_SECT_SIZE / sizeof(u32); - if (dev->tread) { - while (qbuf!=qend) - put_unaligned(*DBUF32,qbuf++); - //*(qbuf++) = *DBUF32; - } - else { - while(qbuf!=qend) - *DBUF32 = get_unaligned(qbuf++); - } - - dev->tsectors_left--; - dev->tbuf += CF_SECT_SIZE; - dev->tbuf_size -= CF_SECT_SIZE; - transfered++; - } while (transfered != dev->block_size && dev->tsectors_left > 0); - - res = wait_not_busy(10 * SECS, 1,dev); - if (res != CF_TRANS_OK) - return res; - }; - - st = rareg(ATA_REG_ST,dev); - if (st & (ATA_REG_ST_DRQ | ATA_REG_ST_DWF | ATA_REG_ST_ERR)) { - if (st & ATA_REG_ST_DRQ) { - printk(KERN_ERR "cf-mips: DRQ after all %d sectors are %s" - ", status 0x%x\n", dev->tsector_count, (dev->tread ? "read" : "written"), st); - } else if (st & ATA_REG_ST_DWF) { - printk(KERN_ERR "cf-mips: write fault, status 0x%x\n", st); - } else { - int errId = rareg(ATA_REG_ERR,dev); - printk(KERN_ERR "cf-mips: %s error, status 0x%x, errid 0x%x\n", - (dev->tread ? "read" : "write"), st, errId); - } - return CF_TRANS_FAILED; - } - return CF_TRANS_OK; -} - -static int cf_do_state(struct cf_mips_dev *dev) -{ - int res; - switch (dev->tstate) { /* fall through everywhere */ - case TS_IDLE: - dev->tstate = TS_READY; - if (is_busy(dev)) { - dev->tstate = TS_AFTER_RESET; - res = do_reset(dev); - if (res != CF_TRANS_OK) - break; - } - case TS_AFTER_RESET: - if (dev->tstate == TS_AFTER_RESET) { - dev->tstate = TS_READY; - res = set_multiple(dev); - if (res != CF_TRANS_OK) - break; - } - case TS_READY: - dev->tstate = TS_CMD; - res = set_cmd(dev); - if (res != CF_TRANS_OK) - break;; - case TS_CMD: - dev->tstate = TS_TRANS; - case TS_TRANS: - res = do_trans(dev); - break; - default: - printk(KERN_ERR "cf-mips: BUG: unknown tstate %d\n", dev->tstate); - return CF_TRANS_FAILED; - } - if (res != CF_TRANS_IN_PROGRESS) - dev->tstate = TS_IDLE; - return res; -} - -static void cf_do_tasklet(unsigned long dev_l) -{ - struct cf_mips_dev* dev=(struct cf_mips_dev*) dev_l; - int res; - - disable_irq(dev->irq); - - if (dev->tstate == TS_IDLE) - return; /* can happen when irq is first registered */ - -#if 0 - DEBUGP(KERN_WARNING "cf-mips: not busy ok (tasklet) status 0x%02x\n", - (unsigned) rareg(ATA_REG_ST,dev)); -#endif - - res = cf_do_state(dev); - if (res == CF_TRANS_IN_PROGRESS) - return; - cf_async_trans_done(dev,res); -} - -static void cf_async_timeout(unsigned long dev_l) -{ - struct cf_mips_dev* dev=(struct cf_mips_dev*) dev_l; - disable_irq(dev->irq); - /* Perhaps send abort to the device? */ - printk(KERN_ERR "cf-mips: wait not busy timeout (%lus)" - ", status 0x%02x, state %d\n", - jiffies - dev->irq_enable_time, (unsigned) rareg(ATA_REG_ST,dev), dev->tstate); - dev->tstate = TS_IDLE; - cf_async_trans_done(dev,CF_TRANS_FAILED); -} - -int cf_do_transfer(struct cf_mips_dev* dev,sector_t sector, unsigned long nsect, - char* buffer, int is_write) -{ - BUG_ON(dev->tstate!=TS_IDLE); - if (nsect > ATA_MAX_SECT_PER_CMD) { - printk(KERN_WARNING "cf-mips: sector count %lu out of range\n",nsect); - return CF_TRANS_FAILED; - } - if (sector + nsect > dev->sectors) { - printk(KERN_WARNING "cf-mips: sector %lu out of range\n",sector); - return CF_TRANS_FAILED; - } - dev->tbuf = buffer; - dev->tbuf_size = nsect*512; - dev->tsect_start = sector; - dev->tsector_count = nsect; - dev->tsectors_left = dev->tsector_count; - dev->tread = (is_write)?0:1; - - dev->tcmd = (dev->block_size == 1 ? - (is_write ? ATA_CMD_WRITE_SECTORS : ATA_CMD_READ_SECTORS) : - (is_write ? ATA_CMD_WRITE_MULTIPLE : ATA_CMD_READ_MULTIPLE)); - - return cf_do_state(dev); -} - -static int do_identify(struct cf_mips_dev *dev) -{ - u16 sbuf[CF_SECT_SIZE >> 1]; - int res; - char tstr[17]; //serial - char tmp; - int i; - BUG_ON(dev->tstate!=TS_IDLE); - dev->tbuf = (char *) sbuf; - dev->tbuf_size = CF_SECT_SIZE; - dev->tsect_start = 0; - dev->tsector_count = 0; - dev->tsectors_left = 1; - dev->tread = 1; - dev->tcmd = ATA_CMD_IDENTIFY_DRIVE; - - DEBUGP(KERN_INFO "cf-mips: identify drive..\n"); - res = cf_do_state(dev); - if (res == CF_TRANS_IN_PROGRESS) { - printk(KERN_ERR "cf-mips: BUG: async identify cmd\n"); - return CF_TRANS_FAILED; - } - if (res != CF_TRANS_OK) - return 0; - - dev->head = sbuf[3]; - dev->cyl = sbuf[1]; - dev->spt = sbuf[6]; - dev->sectors = ((unsigned long) sbuf[7] << 16) | sbuf[8]; - dev->dtype=sbuf[0]; - memcpy(tstr, &sbuf[12], 16); - tstr[16] = '\0'; - - /* Byte-swap the serial number */ - for (i = 0; i<8; i++) { - tmp = tstr[i * 2]; - tstr[i * 2] = tstr[i * 2 +1]; - tstr[i * 2 + 1] = tmp; - } - - printk(KERN_INFO "cf-mips: %s detected, C/H/S=%d/%d/%d sectors=%u (%uMB) Serial=%s\n", - (sbuf[0] == 0x848A ? "CF card" : "ATA drive"), dev->cyl, dev->head, - dev->spt, dev->sectors, dev->sectors >> 11, tstr); - return 1; -} - -static void init_multiple(struct cf_mips_dev * dev) -{ - int res; - DEBUGP(KERN_INFO "cf-mips: detecting block size\n"); - - dev->block_size = 128; /* max block size = 128 sectors (64KB) */ - do { - wareg(dev->block_size, ATA_REG_SC,dev); - wareg(ATA_REG_DH_BASE | ATA_REG_DH_LBA, ATA_REG_DH,dev); - wareg(ATA_CMD_SET_MULTIPLE, ATA_REG_CMD,dev); - - res = wait_not_busy(10 * SECS, 1,dev); - if (res != CF_TRANS_OK) { - printk(KERN_ERR "cf-mips: failed to detect block size: busy!\n"); - dev->block_size = 1; - return; - } - if ((rareg(ATA_REG_ST,dev) & ATA_REG_ST_ERR) == 0) - break; - dev->block_size /= 2; - } while (dev->block_size > 1); - - printk(KERN_INFO "cf-mips: multiple sectors = %d\n", dev->block_size); -} - -int cf_init(struct cf_mips_dev *dev) -{ - tasklet_init(&dev->tasklet,cf_do_tasklet,(unsigned long)dev); - dev->baddr = ioremap_nocache((unsigned long)dev->base, CFDEV_BUF_SIZE); - if (!dev->baddr) { - printk(KERN_ERR "cf-mips: cf_init: ioremap for (%lx,%x) failed\n", - (unsigned long) dev->base, CFDEV_BUF_SIZE); - return -EBUSY; - } - - if (!cf_present(dev)) { - printk(KERN_WARNING "cf-mips: cf card not present\n"); - iounmap(dev->baddr); - return -ENODEV; - } - - if (do_reset(dev) != CF_TRANS_OK) { - printk(KERN_ERR "cf-mips: cf reset failed\n"); - iounmap(dev->baddr); - return -EBUSY; - } - - if (!do_identify(dev)) { - printk(KERN_ERR "cf-mips: cf identify failed\n"); - iounmap(dev->baddr); - return -EBUSY; - } - -/* set_apm_level(ATA_APM_WITH_STANDBY); */ - init_multiple(dev); - - init_timer(&dev->to_timer); - dev->to_timer.function = cf_async_timeout; - dev->to_timer.data = (unsigned long)dev; - - prepare_cf_irq(dev); - if (request_irq(dev->irq, cf_irq_handler, 0, "CF Mips", dev)) { - printk(KERN_ERR "cf-mips: failed to get irq\n"); - iounmap(dev->baddr); - return -EBUSY; - } - /* Disable below would be odd, because request will enable, and the tasklet - will disable it itself */ - //disable_irq(dev->irq); - - dev->async_mode = 1; - - return 0; -} - -void cf_cleanup(struct cf_mips_dev *dev) -{ - iounmap(dev->baddr); - free_irq(dev->irq, NULL); -#if REQUEST_MEM_REGION - release_mem_region((unsigned long)dev->base, CFDEV_BUF_SIZE); -#endif -} - - -/*eof*/ |