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openwrt/target/linux/rb532/files/drivers/block/rb500/ata.c

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/* 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
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;
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*/
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