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--- linux.old/drivers/mtd/chips/cfi_cmdset_0001.c 2007-02-13 02:41:50.816650352 +0100
+++ linux.dev/drivers/mtd/chips/cfi_cmdset_0001.c 2007-02-13 02:42:13.782159064 +0100
@@ -908,7 +908,7 @@
static int __xipram xip_wait_for_operation(
struct map_info *map, struct flchip *chip,
- unsigned long adr, unsigned int chip_op_time )
+ unsigned long adr, int *chip_op_time )
{
struct cfi_private *cfi = map->fldrv_priv;
struct cfi_pri_intelext *cfip = cfi->cmdset_priv;
@@ -917,7 +917,7 @@
flstate_t oldstate, newstate;
start = xip_currtime();
- usec = chip_op_time * 8;
+ usec = *chip_op_time * 8;
if (usec == 0)
usec = 500000;
done = 0;
@@ -1027,8 +1027,8 @@
#define XIP_INVAL_CACHED_RANGE(map, from, size) \
INVALIDATE_CACHED_RANGE(map, from, size)
-#define INVAL_CACHE_AND_WAIT(map, chip, cmd_adr, inval_adr, inval_len, usec) \
- xip_wait_for_operation(map, chip, cmd_adr, usec)
+#define INVAL_CACHE_AND_WAIT(map, chip, cmd_adr, inval_adr, inval_len, p_usec) \
+ xip_wait_for_operation(map, chip, cmd_adr, p_usec)
#else
@@ -1040,65 +1040,65 @@
static int inval_cache_and_wait_for_operation(
struct map_info *map, struct flchip *chip,
unsigned long cmd_adr, unsigned long inval_adr, int inval_len,
- unsigned int chip_op_time)
+ int *chip_op_time )
{
struct cfi_private *cfi = map->fldrv_priv;
map_word status, status_OK = CMD(0x80);
- int chip_state = chip->state;
- unsigned int timeo, sleep_time;
+ int z, chip_state = chip->state;
+ unsigned long timeo;
spin_unlock(chip->mutex);
if (inval_len)
INVALIDATE_CACHED_RANGE(map, inval_adr, inval_len);
+ if (*chip_op_time)
+ cfi_udelay(*chip_op_time);
spin_lock(chip->mutex);
- /* set our timeout to 8 times the expected delay */
- timeo = chip_op_time * 8;
- if (!timeo)
- timeo = 500000;
- sleep_time = chip_op_time / 2;
+ timeo = *chip_op_time * 8 * HZ / 1000000;
+ if (timeo < HZ/2)
+ timeo = HZ/2;
+ timeo += jiffies;
+ z = 0;
for (;;) {
+ if (chip->state != chip_state) {
+ /* Someone's suspended the operation: sleep */
+ DECLARE_WAITQUEUE(wait, current);
+
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ add_wait_queue(&chip->wq, &wait);
+ spin_unlock(chip->mutex);
+ schedule();
+ remove_wait_queue(&chip->wq, &wait);
+ timeo = jiffies + (HZ / 2); /* FIXME */
+ spin_lock(chip->mutex);
+ continue;
+ }
+
status = map_read(map, cmd_adr);
if (map_word_andequal(map, status, status_OK, status_OK))
break;
- if (!timeo) {
+ /* OK Still waiting */
+ if (time_after(jiffies, timeo)) {
map_write(map, CMD(0x70), cmd_adr);
chip->state = FL_STATUS;
return -ETIME;
}
- /* OK Still waiting. Drop the lock, wait a while and retry. */
+ /* Latency issues. Drop the lock, wait a while and retry */
+ z++;
spin_unlock(chip->mutex);
- if (sleep_time >= 1000000/HZ) {
- /*
- * Half of the normal delay still remaining
- * can be performed with a sleeping delay instead
- * of busy waiting.
- */
- msleep(sleep_time/1000);
- timeo -= sleep_time;
- sleep_time = 1000000/HZ;
- } else {
- udelay(1);
- cond_resched();
- timeo--;
- }
+ cfi_udelay(1);
spin_lock(chip->mutex);
-
- while (chip->state != chip_state) {
- /* Someone's suspended the operation: sleep */
- DECLARE_WAITQUEUE(wait, current);
- set_current_state(TASK_UNINTERRUPTIBLE);
- add_wait_queue(&chip->wq, &wait);
- spin_unlock(chip->mutex);
- schedule();
- remove_wait_queue(&chip->wq, &wait);
- spin_lock(chip->mutex);
- }
}
+ if (!z) {
+ if (!--(*chip_op_time))
+ *chip_op_time = 1;
+ } else if (z > 1)
+ ++(*chip_op_time);
+
/* Done and happy. */
chip->state = FL_STATUS;
return 0;
@@ -1107,7 +1107,8 @@
#endif
#define WAIT_TIMEOUT(map, chip, adr, udelay) \
- INVAL_CACHE_AND_WAIT(map, chip, adr, 0, 0, udelay);
+ ({ int __udelay = (udelay); \
+ INVAL_CACHE_AND_WAIT(map, chip, adr, 0, 0, &__udelay); })
static int do_point_onechip (struct map_info *map, struct flchip *chip, loff_t adr, size_t len)
@@ -1331,7 +1332,7 @@
ret = INVAL_CACHE_AND_WAIT(map, chip, adr,
adr, map_bankwidth(map),
- chip->word_write_time);
+ &chip->word_write_time);
if (ret) {
xip_enable(map, chip, adr);
printk(KERN_ERR "%s: word write error (status timeout)\n", map->name);
@@ -1568,7 +1569,7 @@
ret = INVAL_CACHE_AND_WAIT(map, chip, cmd_adr,
adr, len,
- chip->buffer_write_time);
+ &chip->buffer_write_time);
if (ret) {
map_write(map, CMD(0x70), cmd_adr);
chip->state = FL_STATUS;
@@ -1703,7 +1704,7 @@
ret = INVAL_CACHE_AND_WAIT(map, chip, adr,
adr, len,
- chip->erase_time);
+ &chip->erase_time);
if (ret) {
map_write(map, CMD(0x70), adr);
chip->state = FL_STATUS;
|
