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Subject[PATCH] New Lock and Unlock Code for Intel FLASH parts
Date


-----Original Message-----
From: Christopher Hoover [mailto:ch@hpl.hp.com]
Sent: Friday, February 08, 2002 12:45 PM
To: linux-arm-kernel@lists.arm.linux.org.uk
Cc: dwmw2@redhat.com; Jeroen.Roose@chess.nl; ch@murgatroid.com
Subject: New Lock and Unlock Code for Intel FLASH parts


Folks,

I rewrote some of the locking and unlocking support for Intel parts in
drivers/mtd/chips/cfi_cmdset_0001.c because it seemed completely broken
for parts with variable block sizes, such as the Intel C3 flash I am
using.

An added benefit of this code is the removal of some cut-and-pasted code
in the driver. (Another pass could be made to unify erase support with
locking and unlocking ...)

I don't have a wide variety of hardware to test this on, so if folks
code give this a try and give me some feedback, I'd appreciate that.

Thanks,
Christopher.
mailto:ch@murgatroid.com
mailto:ch@hpl.hp.com


PATCH FOLLOWS
KernelVersion: 2.4.17-rmk5
--- linux-2.4.17-rmk5/drivers/mtd/chips/cfi_cmdset_0001.c Tue Feb
5 17:42:22 2002
+++ linux-2.4.17-rmk5-badge4-ch1/drivers/mtd/chips/cfi_cmdset_0001.c
Tue Feb 5 22:58:30 2002
@@ -13,6 +13,8 @@
* - scalability vs code size is completely set at compile-time
* (see include/linux/mtd/cfi.h for selection)
* - optimized write buffer method
+ * 02/05/2002 Christopher Hoover <ch@hpl.hp.com>/<ch@murgatroid.com>
+ * - reworked lock and unlock support
*/

#include <linux/module.h>
@@ -61,6 +63,8 @@
#ifdef DEBUG_CFI_FEATURES
static void cfi_tell_features(struct cfi_pri_intelext *extp)
{
+ int i;
+
printk(" Feature/Command Support: %4.4X\n",
extp->FeatureSupport);
printk(" - Chip Erase: %s\n",
extp->FeatureSupport&1?"supported":"unsupported");
printk(" - Suspend Erase: %s\n",
extp->FeatureSupport&2?"supported":"unsupported");
@@ -1050,8 +1054,99 @@
return 0;
}

+typedef int (*varsize_frob_t)(struct map_info *map, struct flchip
*chip,
+ unsigned long adr);
+
+static int cfi_intelext_varsize_frob(struct mtd_info *mtd,
varsize_frob_t frob,
+ loff_t ofs, size_t len)
+{
+ struct map_info *map = mtd->priv;
+ struct cfi_private *cfi = map->fldrv_priv;
+ unsigned long adr;
+ int chipnum, ret = 0;
+ int i, first;
+ struct mtd_erase_region_info *regions = mtd->eraseregions;
+
+ if (ofs > mtd->size)
+ return -EINVAL;
+
+ if ((len + ofs) > mtd->size)
+ return -EINVAL;
+
+ /* Check that both start and end of the requested erase are
+ * aligned with the erasesize at the appropriate addresses.
+ */
+
+ i = 0;
+
+ /* Skip all erase regions which are ended before the start of
+ the requested erase. Actually, to save on the calculations,
+ we skip to the first erase region which starts after the
+ start of the requested erase, and then go back one.
+ */
+
+ while (i < mtd->numeraseregions && ofs >= regions[i].offset)
+ i++;
+ i--;
+
+ /* OK, now i is pointing at the erase region in which this
+ erase request starts. Check the start of the requested
+ erase range is aligned with the erase size which is in
+ effect here.
+ */
+
+ if (ofs & (regions[i].erasesize-1))
+ return -EINVAL;
+
+ /* Remember the erase region we start on */
+ first = i;
+
+ /* Next, check that the end of the requested erase is aligned
+ * with the erase region at that address.
+ */
+
+ while (i<mtd->numeraseregions && (ofs + len) >=
regions[i].offset)
+ i++;
+
+ /* As before, drop back one to point at the region in which
+ the address actually falls
+ */
+ i--;
+
+ if ((ofs + len) & (regions[i].erasesize-1))
+ return -EINVAL;
+
+ chipnum = ofs >> cfi->chipshift;
+ adr = ofs - (chipnum << cfi->chipshift);
+
+ i=first;
+
+ while(len) {
+ ret = (*frob)(map, &cfi->chips[chipnum], adr);
+
+ if (ret)
+ return ret;
+
+ adr += regions[i].erasesize;
+ len -= regions[i].erasesize;
+
+ if (adr % (1<< cfi->chipshift) == ((regions[i].offset +
(regions[i].erasesize * regions[i].numblocks)) %( 1<< cfi->chipshift)))
+ i++;
+
+ if (adr >> cfi->chipshift) {
+ adr = 0;
+ chipnum++;
+
+ if (chipnum >= cfi->numchips)
+ break;
+ }
+ }
+
+ return 0;
+}
+

-static inline int do_erase_oneblock(struct map_info *map, struct flchip
*chip, unsigned long adr)
+static int do_erase_oneblock(struct map_info *map, struct flchip *chip,

+unsigned long adr)
{
struct cfi_private *cfi = map->fldrv_priv;
__u32 status, status_OK;
@@ -1214,91 +1309,18 @@
spin_unlock_bh(chip->mutex);
return ret;
}
-
int cfi_intelext_erase_varsize(struct mtd_info *mtd, struct erase_info
*instr)
-{ struct map_info *map = mtd->priv;
- struct cfi_private *cfi = map->fldrv_priv;
- unsigned long adr, len;
- int chipnum, ret = 0;
- int i, first;
- struct mtd_erase_region_info *regions = mtd->eraseregions;
-
- if (instr->addr > mtd->size)
- return -EINVAL;
-
- if ((instr->len + instr->addr) > mtd->size)
- return -EINVAL;
-
- /* Check that both start and end of the requested erase are
- * aligned with the erasesize at the appropriate addresses.
- */
-
- i = 0;
-
- /* Skip all erase regions which are ended before the start of
- the requested erase. Actually, to save on the calculations,
- we skip to the first erase region which starts after the
- start of the requested erase, and then go back one.
- */
-
- while (i < mtd->numeraseregions && instr->addr >=
regions[i].offset)
- i++;
- i--;
-
- /* OK, now i is pointing at the erase region in which this
- erase request starts. Check the start of the requested
- erase range is aligned with the erase size which is in
- effect here.
- */
-
- if (instr->addr & (regions[i].erasesize-1))
- return -EINVAL;
-
- /* Remember the erase region we start on */
- first = i;
-
- /* Next, check that the end of the requested erase is aligned
- * with the erase region at that address.
- */
-
- while (i<mtd->numeraseregions && (instr->addr + instr->len) >=
regions[i].offset)
- i++;
-
- /* As before, drop back one to point at the region in which
- the address actually falls
- */
- i--;
-
- if ((instr->addr + instr->len) & (regions[i].erasesize-1))
- return -EINVAL;
+{
+ unsigned long ofs, len;
+ int ret;

- chipnum = instr->addr >> cfi->chipshift;
- adr = instr->addr - (chipnum << cfi->chipshift);
+ ofs = instr->addr;
len = instr->len;

- i=first;
-
- while(len) {
- ret = do_erase_oneblock(map, &cfi->chips[chipnum], adr);
-
- if (ret)
- return ret;
-
- adr += regions[i].erasesize;
- len -= regions[i].erasesize;
-
- if (adr % (1<< cfi->chipshift) == ((regions[i].offset +
(regions[i].erasesize * regions[i].numblocks)) %( 1<< cfi->chipshift)))
- i++;
+ ret = cfi_intelext_varsize_frob(mtd, do_erase_oneblock, ofs,
len);
+ if (ret)
+ return ret;

- if (adr >> cfi->chipshift) {
- adr = 0;
- chipnum++;
-
- if (chipnum >= cfi->numchips)
- break;
- }
- }
-
instr->state = MTD_ERASE_DONE;
if (instr->callback)
instr->callback(instr);
@@ -1363,11 +1385,26 @@
}
}

-static inline int do_lock_oneblock(struct map_info *map, struct flchip
*chip, unsigned long adr)
+#ifdef DEBUG_LOCK_BITS
+static int do_printlockstatus_oneblock(struct map_info *map, struct
+flchip *chip, unsigned long adr) {
+ struct cfi_private *cfi = map->fldrv_priv;
+ int ofs_factor = cfi->interleave * cfi->device_type;
+
+ cfi_send_gen_cmd(0x90, 0x55, 0, map, cfi, cfi->device_type,
NULL);
+ printk(KERN_DEBUG "block status register for 0x%08lx is %x\n",
+ adr, cfi_read_query(map, adr+(2*ofs_factor)));
+ cfi_send_gen_cmd(0xff, 0x55, 0, map, cfi, cfi->device_type,
NULL);
+
+ return 0;
+}
+#endif
+
+static int do_lock_oneblock(struct map_info *map, struct flchip *chip,
+unsigned long adr)
{
struct cfi_private *cfi = map->fldrv_priv;
__u32 status, status_OK;
- unsigned long timeo = jiffies + HZ;
+ unsigned long timeo;
DECLARE_WAITQUEUE(wait, current);

adr += chip->start;
@@ -1428,7 +1465,7 @@
/* FIXME. Use a timer to check this, and return immediately. */
/* Once the state machine's known to be working I'll do that */

- timeo = jiffies + (HZ*2);
+ timeo = jiffies + (HZ*20);
for (;;) {

status = cfi_read(map, adr);
@@ -1460,63 +1497,31 @@
}
static int cfi_intelext_lock(struct mtd_info *mtd, loff_t ofs, size_t
len) {
- struct map_info *map = mtd->priv;
- struct cfi_private *cfi = map->fldrv_priv;
- unsigned long adr;
- int chipnum, ret = 0;
-#ifdef DEBUG_LOCK_BITS
- int ofs_factor = cfi->interleave * cfi->device_type;
-#endif
-
- if (ofs & (mtd->erasesize - 1))
- return -EINVAL;
-
- if (len & (mtd->erasesize -1))
- return -EINVAL;
-
- if ((len + ofs) > mtd->size)
- return -EINVAL;
-
- chipnum = ofs >> cfi->chipshift;
- adr = ofs - (chipnum << cfi->chipshift);
-
- while(len) {
+ int ret;

#ifdef DEBUG_LOCK_BITS
- cfi_send_gen_cmd(0x90, 0x55, 0, map, cfi,
cfi->device_type, NULL);
- printk("before lock: block status register is
%x\n",cfi_read_query(map, adr+(2*ofs_factor)));
- cfi_send_gen_cmd(0xff, 0x55, 0, map, cfi,
cfi->device_type, NULL);
+ printk(KERN_DEBUG __FUNCTION__
+ ": before locking ofs=0x%08x, len=0x%08lx\n",
+ ofs, len);
+ cfi_intelext_varsize_frob(mtd, do_printlockstatus_oneblock, ofs,
len);
#endif

- ret = do_lock_oneblock(map, &cfi->chips[chipnum], adr);
-
+ ret = cfi_intelext_varsize_frob(mtd, do_lock_oneblock, ofs,
len);
+
#ifdef DEBUG_LOCK_BITS
- cfi_send_gen_cmd(0x90, 0x55, 0, map, cfi,
cfi->device_type, NULL);
- printk("after lock: block status register is
%x\n",cfi_read_query(map, adr+(2*ofs_factor)));
- cfi_send_gen_cmd(0xff, 0x55, 0, map, cfi,
cfi->device_type, NULL);
-#endif
-
- if (ret)
- return ret;
-
- adr += mtd->erasesize;
- len -= mtd->erasesize;
+ printk(KERN_DEBUG __FUNCTION__
+ ": after locking, ret=%d\n", ret);
+ cfi_intelext_varsize_frob(mtd, do_printlockstatus_oneblock, ofs,
len);
+#endif

- if (adr >> cfi->chipshift) {
- adr = 0;
- chipnum++;
-
- if (chipnum >= cfi->numchips)
- break;
- }
- }
- return 0;
+ return ret;
}
-static inline int do_unlock_oneblock(struct map_info *map, struct
flchip *chip, unsigned long adr)
+
+static int do_unlock_oneblock(struct map_info *map, struct flchip
+*chip, unsigned long adr)
{
struct cfi_private *cfi = map->fldrv_priv;
__u32 status, status_OK;
- unsigned long timeo = jiffies + HZ;
+ unsigned long timeo;
DECLARE_WAITQUEUE(wait, current);

adr += chip->start;
@@ -1577,7 +1582,7 @@
/* FIXME. Use a timer to check this, and return immediately. */
/* Once the state machine's known to be working I'll do that */

- timeo = jiffies + (HZ*2);
+ timeo = jiffies + (HZ*20);
for (;;) {

status = cfi_read(map, adr);
@@ -1594,7 +1599,7 @@
return -EIO;
}

- /* Latency issues. Drop the unlock, wait a while and
retry */
+ /* Latency issues. Drop the lock, wait a while and retry
*/
spin_unlock_bh(chip->mutex);
cfi_udelay(1);
spin_lock_bh(chip->mutex);
@@ -1609,38 +1614,21 @@
}
static int cfi_intelext_unlock(struct mtd_info *mtd, loff_t ofs, size_t
len) {
- struct map_info *map = mtd->priv;
- struct cfi_private *cfi = map->fldrv_priv;
- unsigned long adr;
- int chipnum, ret = 0;
-#ifdef DEBUG_LOCK_BITS
- int ofs_factor = cfi->interleave * cfi->device_type;
-#endif
-
- chipnum = ofs >> cfi->chipshift;
- adr = ofs - (chipnum << cfi->chipshift);
+ int ret;

#ifdef DEBUG_LOCK_BITS
- {
- unsigned long temp_adr = adr;
- unsigned long temp_len = len;
-
- cfi_send_gen_cmd(0x90, 0x55, 0, map, cfi,
cfi->device_type, NULL);
- while (temp_len) {
- printk("before unlock %x: block status register
is %x\n",temp_adr,cfi_read_query(map, temp_adr+(2*ofs_factor)));
- temp_adr += mtd->erasesize;
- temp_len -= mtd->erasesize;
- }
- cfi_send_gen_cmd(0xff, 0x55, 0, map, cfi,
cfi->device_type, NULL);
- }
+ printk(KERN_DEBUG __FUNCTION__
+ ": before locking ofs=0x%08x, len=0x%08lx\n",
+ ofs, len);
+ cfi_intelext_varsize_frob(mtd, do_printlockstatus_oneblock, ofs,
len);
#endif

- ret = do_unlock_oneblock(map, &cfi->chips[chipnum], adr);
-
+ ret = cfi_intelext_varsize_frob(mtd, do_unlock_oneblock, ofs,
len);
+
#ifdef DEBUG_LOCK_BITS
- cfi_send_gen_cmd(0x90, 0x55, 0, map, cfi, cfi->device_type,
NULL);
- printk("after unlock: block status register is
%x\n",cfi_read_query(map, adr+(2*ofs_factor)));
- cfi_send_gen_cmd(0xff, 0x55, 0, map, cfi, cfi->device_type,
NULL);
+ printk(KERN_DEBUG __FUNCTION__
+ ": after locking, ret=%d\n", ret);
+ cfi_intelext_varsize_frob(mtd, do_printlockstatus_oneblock, ofs,
len);
#endif

return ret;

-
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