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path: root/drivers/mtd/chips/cfi_cmdset_0002.c
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Diffstat (limited to 'drivers/mtd/chips/cfi_cmdset_0002.c')
-rw-r--r--drivers/mtd/chips/cfi_cmdset_0002.c1161
1 files changed, 900 insertions, 261 deletions
diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c
index 94bb61e1904..e21fde9d4d7 100644
--- a/drivers/mtd/chips/cfi_cmdset_0002.c
+++ b/drivers/mtd/chips/cfi_cmdset_0002.c
@@ -24,7 +24,6 @@
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
-#include <linux/init.h>
#include <asm/io.h>
#include <asm/byteorder.h>
@@ -32,7 +31,9 @@
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
-#include <linux/mtd/compatmac.h>
+#include <linux/reboot.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
#include <linux/mtd/map.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/cfi.h>
@@ -43,10 +44,6 @@
#define MAX_WORD_RETRIES 3
-#define MANUFACTURER_AMD 0x0001
-#define MANUFACTURER_ATMEL 0x001F
-#define MANUFACTURER_MACRONIX 0x00C2
-#define MANUFACTURER_SST 0x00BF
#define SST49LF004B 0x0060
#define SST49LF040B 0x0050
#define SST49LF008A 0x005a
@@ -60,8 +57,12 @@ static int cfi_amdstd_erase_varsize(struct mtd_info *, struct erase_info *);
static void cfi_amdstd_sync (struct mtd_info *);
static int cfi_amdstd_suspend (struct mtd_info *);
static void cfi_amdstd_resume (struct mtd_info *);
+static int cfi_amdstd_reboot(struct notifier_block *, unsigned long, void *);
static int cfi_amdstd_secsi_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
+static int cfi_amdstd_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
+ size_t *retlen, const u_char *buf);
+
static void cfi_amdstd_destroy(struct mtd_info *);
struct mtd_info *cfi_cmdset_0002(struct map_info *, int);
@@ -74,6 +75,10 @@ static void put_chip(struct map_info *map, struct flchip *chip, unsigned long ad
static int cfi_atmel_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
static int cfi_atmel_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
+static int cfi_ppb_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
+static int cfi_ppb_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
+static int cfi_ppb_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len);
+
static struct mtd_chip_driver cfi_amdstd_chipdrv = {
.probe = NULL, /* Not usable directly */
.destroy = cfi_amdstd_destroy,
@@ -137,7 +142,7 @@ static void cfi_tell_features(struct cfi_pri_amdstd *extp)
#ifdef AMD_BOOTLOC_BUG
/* Wheee. Bring me the head of someone at AMD. */
-static void fixup_amd_bootblock(struct mtd_info *mtd, void* param)
+static void fixup_amd_bootblock(struct mtd_info *mtd)
{
struct map_info *map = mtd->priv;
struct cfi_private *cfi = map->fldrv_priv;
@@ -148,8 +153,7 @@ static void fixup_amd_bootblock(struct mtd_info *mtd, void* param)
if (((major << 8) | minor) < 0x3131) {
/* CFI version 1.0 => don't trust bootloc */
- DEBUG(MTD_DEBUG_LEVEL1,
- "%s: JEDEC Vendor ID is 0x%02X Device ID is 0x%02X\n",
+ pr_debug("%s: JEDEC Vendor ID is 0x%02X Device ID is 0x%02X\n",
map->name, cfi->mfr, cfi->id);
/* AFAICS all 29LV400 with a bottom boot block have a device ID
@@ -168,9 +172,8 @@ static void fixup_amd_bootblock(struct mtd_info *mtd, void* param)
* This reduces the risk of false detection due to
* the 8-bit device ID.
*/
- (cfi->mfr == MANUFACTURER_MACRONIX)) {
- DEBUG(MTD_DEBUG_LEVEL1,
- "%s: Macronix MX29LV400C with bottom boot block"
+ (cfi->mfr == CFI_MFR_MACRONIX)) {
+ pr_debug("%s: Macronix MX29LV400C with bottom boot block"
" detected\n", map->name);
extp->TopBottom = 2; /* bottom boot */
} else
@@ -181,26 +184,25 @@ static void fixup_amd_bootblock(struct mtd_info *mtd, void* param)
extp->TopBottom = 2; /* bottom boot */
}
- DEBUG(MTD_DEBUG_LEVEL1,
- "%s: AMD CFI PRI V%c.%c has no boot block field;"
+ pr_debug("%s: AMD CFI PRI V%c.%c has no boot block field;"
" deduced %s from Device ID\n", map->name, major, minor,
extp->TopBottom == 2 ? "bottom" : "top");
}
}
#endif
-static void fixup_use_write_buffers(struct mtd_info *mtd, void *param)
+static void fixup_use_write_buffers(struct mtd_info *mtd)
{
struct map_info *map = mtd->priv;
struct cfi_private *cfi = map->fldrv_priv;
if (cfi->cfiq->BufWriteTimeoutTyp) {
- DEBUG(MTD_DEBUG_LEVEL1, "Using buffer write method\n" );
- mtd->write = cfi_amdstd_write_buffers;
+ pr_debug("Using buffer write method\n" );
+ mtd->_write = cfi_amdstd_write_buffers;
}
}
/* Atmel chips don't use the same PRI format as AMD chips */
-static void fixup_convert_atmel_pri(struct mtd_info *mtd, void *param)
+static void fixup_convert_atmel_pri(struct mtd_info *mtd)
{
struct map_info *map = mtd->priv;
struct cfi_private *cfi = map->fldrv_priv;
@@ -231,20 +233,20 @@ static void fixup_convert_atmel_pri(struct mtd_info *mtd, void *param)
cfi->cfiq->BufWriteTimeoutMax = 0;
}
-static void fixup_use_secsi(struct mtd_info *mtd, void *param)
+static void fixup_use_secsi(struct mtd_info *mtd)
{
/* Setup for chips with a secsi area */
- mtd->read_user_prot_reg = cfi_amdstd_secsi_read;
- mtd->read_fact_prot_reg = cfi_amdstd_secsi_read;
+ mtd->_read_user_prot_reg = cfi_amdstd_secsi_read;
+ mtd->_read_fact_prot_reg = cfi_amdstd_secsi_read;
}
-static void fixup_use_erase_chip(struct mtd_info *mtd, void *param)
+static void fixup_use_erase_chip(struct mtd_info *mtd)
{
struct map_info *map = mtd->priv;
struct cfi_private *cfi = map->fldrv_priv;
if ((cfi->cfiq->NumEraseRegions == 1) &&
((cfi->cfiq->EraseRegionInfo[0] & 0xffff) == 0)) {
- mtd->erase = cfi_amdstd_erase_chip;
+ mtd->_erase = cfi_amdstd_erase_chip;
}
}
@@ -253,61 +255,146 @@ static void fixup_use_erase_chip(struct mtd_info *mtd, void *param)
* Some Atmel chips (e.g. the AT49BV6416) power-up with all sectors
* locked by default.
*/
-static void fixup_use_atmel_lock(struct mtd_info *mtd, void *param)
+static void fixup_use_atmel_lock(struct mtd_info *mtd)
{
- mtd->lock = cfi_atmel_lock;
- mtd->unlock = cfi_atmel_unlock;
+ mtd->_lock = cfi_atmel_lock;
+ mtd->_unlock = cfi_atmel_unlock;
mtd->flags |= MTD_POWERUP_LOCK;
}
-static void fixup_s29gl064n_sectors(struct mtd_info *mtd, void *param)
+static void fixup_old_sst_eraseregion(struct mtd_info *mtd)
+{
+ struct map_info *map = mtd->priv;
+ struct cfi_private *cfi = map->fldrv_priv;
+
+ /*
+ * These flashes report two separate eraseblock regions based on the
+ * sector_erase-size and block_erase-size, although they both operate on the
+ * same memory. This is not allowed according to CFI, so we just pick the
+ * sector_erase-size.
+ */
+ cfi->cfiq->NumEraseRegions = 1;
+}
+
+static void fixup_sst39vf(struct mtd_info *mtd)
+{
+ struct map_info *map = mtd->priv;
+ struct cfi_private *cfi = map->fldrv_priv;
+
+ fixup_old_sst_eraseregion(mtd);
+
+ cfi->addr_unlock1 = 0x5555;
+ cfi->addr_unlock2 = 0x2AAA;
+}
+
+static void fixup_sst39vf_rev_b(struct mtd_info *mtd)
+{
+ struct map_info *map = mtd->priv;
+ struct cfi_private *cfi = map->fldrv_priv;
+
+ fixup_old_sst_eraseregion(mtd);
+
+ cfi->addr_unlock1 = 0x555;
+ cfi->addr_unlock2 = 0x2AA;
+
+ cfi->sector_erase_cmd = CMD(0x50);
+}
+
+static void fixup_sst38vf640x_sectorsize(struct mtd_info *mtd)
+{
+ struct map_info *map = mtd->priv;
+ struct cfi_private *cfi = map->fldrv_priv;
+
+ fixup_sst39vf_rev_b(mtd);
+
+ /*
+ * CFI reports 1024 sectors (0x03ff+1) of 64KBytes (0x0100*256) where
+ * it should report a size of 8KBytes (0x0020*256).
+ */
+ cfi->cfiq->EraseRegionInfo[0] = 0x002003ff;
+ pr_warning("%s: Bad 38VF640x CFI data; adjusting sector size from 64 to 8KiB\n", mtd->name);
+}
+
+static void fixup_s29gl064n_sectors(struct mtd_info *mtd)
{
struct map_info *map = mtd->priv;
struct cfi_private *cfi = map->fldrv_priv;
if ((cfi->cfiq->EraseRegionInfo[0] & 0xffff) == 0x003f) {
cfi->cfiq->EraseRegionInfo[0] |= 0x0040;
- pr_warning("%s: Bad S29GL064N CFI data, adjust from 64 to 128 sectors\n", mtd->name);
+ pr_warning("%s: Bad S29GL064N CFI data; adjust from 64 to 128 sectors\n", mtd->name);
}
}
-static void fixup_s29gl032n_sectors(struct mtd_info *mtd, void *param)
+static void fixup_s29gl032n_sectors(struct mtd_info *mtd)
{
struct map_info *map = mtd->priv;
struct cfi_private *cfi = map->fldrv_priv;
if ((cfi->cfiq->EraseRegionInfo[1] & 0xffff) == 0x007e) {
cfi->cfiq->EraseRegionInfo[1] &= ~0x0040;
- pr_warning("%s: Bad S29GL032N CFI data, adjust from 127 to 63 sectors\n", mtd->name);
+ pr_warning("%s: Bad S29GL032N CFI data; adjust from 127 to 63 sectors\n", mtd->name);
}
}
+static void fixup_s29ns512p_sectors(struct mtd_info *mtd)
+{
+ struct map_info *map = mtd->priv;
+ struct cfi_private *cfi = map->fldrv_priv;
+
+ /*
+ * S29NS512P flash uses more than 8bits to report number of sectors,
+ * which is not permitted by CFI.
+ */
+ cfi->cfiq->EraseRegionInfo[0] = 0x020001ff;
+ pr_warning("%s: Bad S29NS512P CFI data; adjust to 512 sectors\n", mtd->name);
+}
+
+/* Used to fix CFI-Tables of chips without Extended Query Tables */
+static struct cfi_fixup cfi_nopri_fixup_table[] = {
+ { CFI_MFR_SST, 0x234a, fixup_sst39vf }, /* SST39VF1602 */
+ { CFI_MFR_SST, 0x234b, fixup_sst39vf }, /* SST39VF1601 */
+ { CFI_MFR_SST, 0x235a, fixup_sst39vf }, /* SST39VF3202 */
+ { CFI_MFR_SST, 0x235b, fixup_sst39vf }, /* SST39VF3201 */
+ { CFI_MFR_SST, 0x235c, fixup_sst39vf_rev_b }, /* SST39VF3202B */
+ { CFI_MFR_SST, 0x235d, fixup_sst39vf_rev_b }, /* SST39VF3201B */
+ { CFI_MFR_SST, 0x236c, fixup_sst39vf_rev_b }, /* SST39VF6402B */
+ { CFI_MFR_SST, 0x236d, fixup_sst39vf_rev_b }, /* SST39VF6401B */
+ { 0, 0, NULL }
+};
+
static struct cfi_fixup cfi_fixup_table[] = {
- { CFI_MFR_ATMEL, CFI_ID_ANY, fixup_convert_atmel_pri, NULL },
+ { CFI_MFR_ATMEL, CFI_ID_ANY, fixup_convert_atmel_pri },
#ifdef AMD_BOOTLOC_BUG
- { CFI_MFR_AMD, CFI_ID_ANY, fixup_amd_bootblock, NULL },
- { MANUFACTURER_MACRONIX, CFI_ID_ANY, fixup_amd_bootblock, NULL },
+ { CFI_MFR_AMD, CFI_ID_ANY, fixup_amd_bootblock },
+ { CFI_MFR_AMIC, CFI_ID_ANY, fixup_amd_bootblock },
+ { CFI_MFR_MACRONIX, CFI_ID_ANY, fixup_amd_bootblock },
#endif
- { CFI_MFR_AMD, 0x0050, fixup_use_secsi, NULL, },
- { CFI_MFR_AMD, 0x0053, fixup_use_secsi, NULL, },
- { CFI_MFR_AMD, 0x0055, fixup_use_secsi, NULL, },
- { CFI_MFR_AMD, 0x0056, fixup_use_secsi, NULL, },
- { CFI_MFR_AMD, 0x005C, fixup_use_secsi, NULL, },
- { CFI_MFR_AMD, 0x005F, fixup_use_secsi, NULL, },
- { CFI_MFR_AMD, 0x0c01, fixup_s29gl064n_sectors, NULL, },
- { CFI_MFR_AMD, 0x1301, fixup_s29gl064n_sectors, NULL, },
- { CFI_MFR_AMD, 0x1a00, fixup_s29gl032n_sectors, NULL, },
- { CFI_MFR_AMD, 0x1a01, fixup_s29gl032n_sectors, NULL, },
+ { CFI_MFR_AMD, 0x0050, fixup_use_secsi },
+ { CFI_MFR_AMD, 0x0053, fixup_use_secsi },
+ { CFI_MFR_AMD, 0x0055, fixup_use_secsi },
+ { CFI_MFR_AMD, 0x0056, fixup_use_secsi },
+ { CFI_MFR_AMD, 0x005C, fixup_use_secsi },
+ { CFI_MFR_AMD, 0x005F, fixup_use_secsi },
+ { CFI_MFR_AMD, 0x0c01, fixup_s29gl064n_sectors },
+ { CFI_MFR_AMD, 0x1301, fixup_s29gl064n_sectors },
+ { CFI_MFR_AMD, 0x1a00, fixup_s29gl032n_sectors },
+ { CFI_MFR_AMD, 0x1a01, fixup_s29gl032n_sectors },
+ { CFI_MFR_AMD, 0x3f00, fixup_s29ns512p_sectors },
+ { CFI_MFR_SST, 0x536a, fixup_sst38vf640x_sectorsize }, /* SST38VF6402 */
+ { CFI_MFR_SST, 0x536b, fixup_sst38vf640x_sectorsize }, /* SST38VF6401 */
+ { CFI_MFR_SST, 0x536c, fixup_sst38vf640x_sectorsize }, /* SST38VF6404 */
+ { CFI_MFR_SST, 0x536d, fixup_sst38vf640x_sectorsize }, /* SST38VF6403 */
#if !FORCE_WORD_WRITE
- { CFI_MFR_ANY, CFI_ID_ANY, fixup_use_write_buffers, NULL, },
+ { CFI_MFR_ANY, CFI_ID_ANY, fixup_use_write_buffers },
#endif
- { 0, 0, NULL, NULL }
+ { 0, 0, NULL }
};
static struct cfi_fixup jedec_fixup_table[] = {
- { MANUFACTURER_SST, SST49LF004B, fixup_use_fwh_lock, NULL, },
- { MANUFACTURER_SST, SST49LF040B, fixup_use_fwh_lock, NULL, },
- { MANUFACTURER_SST, SST49LF008A, fixup_use_fwh_lock, NULL, },
- { 0, 0, NULL, NULL }
+ { CFI_MFR_SST, SST49LF004B, fixup_use_fwh_lock },
+ { CFI_MFR_SST, SST49LF040B, fixup_use_fwh_lock },
+ { CFI_MFR_SST, SST49LF008A, fixup_use_fwh_lock },
+ { 0, 0, NULL }
};
static struct cfi_fixup fixup_table[] = {
@@ -316,106 +403,218 @@ static struct cfi_fixup fixup_table[] = {
* well. This table is to pick all cases where
* we know that is the case.
*/
- { CFI_MFR_ANY, CFI_ID_ANY, fixup_use_erase_chip, NULL },
- { CFI_MFR_ATMEL, AT49BV6416, fixup_use_atmel_lock, NULL },
- { 0, 0, NULL, NULL }
+ { CFI_MFR_ANY, CFI_ID_ANY, fixup_use_erase_chip },
+ { CFI_MFR_ATMEL, AT49BV6416, fixup_use_atmel_lock },
+ { 0, 0, NULL }
};
static void cfi_fixup_major_minor(struct cfi_private *cfi,
struct cfi_pri_amdstd *extp)
{
- if (cfi->mfr == CFI_MFR_SAMSUNG && cfi->id == 0x257e &&
- extp->MajorVersion == '0')
+ if (cfi->mfr == CFI_MFR_SAMSUNG) {
+ if ((extp->MajorVersion == '0' && extp->MinorVersion == '0') ||
+ (extp->MajorVersion == '3' && extp->MinorVersion == '3')) {
+ /*
+ * Samsung K8P2815UQB and K8D6x16UxM chips
+ * report major=0 / minor=0.
+ * K8D3x16UxC chips report major=3 / minor=3.
+ */
+ printk(KERN_NOTICE " Fixing Samsung's Amd/Fujitsu"
+ " Extended Query version to 1.%c\n",
+ extp->MinorVersion);
+ extp->MajorVersion = '1';
+ }
+ }
+
+ /*
+ * SST 38VF640x chips report major=0xFF / minor=0xFF.
+ */
+ if (cfi->mfr == CFI_MFR_SST && (cfi->id >> 4) == 0x0536) {
extp->MajorVersion = '1';
+ extp->MinorVersion = '0';
+ }
+}
+
+static int is_m29ew(struct cfi_private *cfi)
+{
+ if (cfi->mfr == CFI_MFR_INTEL &&
+ ((cfi->device_type == CFI_DEVICETYPE_X8 && (cfi->id & 0xff) == 0x7e) ||
+ (cfi->device_type == CFI_DEVICETYPE_X16 && cfi->id == 0x227e)))
+ return 1;
+ return 0;
+}
+
+/*
+ * From TN-13-07: Patching the Linux Kernel and U-Boot for M29 Flash, page 20:
+ * Some revisions of the M29EW suffer from erase suspend hang ups. In
+ * particular, it can occur when the sequence
+ * Erase Confirm -> Suspend -> Program -> Resume
+ * causes a lockup due to internal timing issues. The consequence is that the
+ * erase cannot be resumed without inserting a dummy command after programming
+ * and prior to resuming. [...] The work-around is to issue a dummy write cycle
+ * that writes an F0 command code before the RESUME command.
+ */
+static void cfi_fixup_m29ew_erase_suspend(struct map_info *map,
+ unsigned long adr)
+{
+ struct cfi_private *cfi = map->fldrv_priv;
+ /* before resume, insert a dummy 0xF0 cycle for Micron M29EW devices */
+ if (is_m29ew(cfi))
+ map_write(map, CMD(0xF0), adr);
+}
+
+/*
+ * From TN-13-07: Patching the Linux Kernel and U-Boot for M29 Flash, page 22:
+ *
+ * Some revisions of the M29EW (for example, A1 and A2 step revisions)
+ * are affected by a problem that could cause a hang up when an ERASE SUSPEND
+ * command is issued after an ERASE RESUME operation without waiting for a
+ * minimum delay. The result is that once the ERASE seems to be completed
+ * (no bits are toggling), the contents of the Flash memory block on which
+ * the erase was ongoing could be inconsistent with the expected values
+ * (typically, the array value is stuck to the 0xC0, 0xC4, 0x80, or 0x84
+ * values), causing a consequent failure of the ERASE operation.
+ * The occurrence of this issue could be high, especially when file system
+ * operations on the Flash are intensive. As a result, it is recommended
+ * that a patch be applied. Intensive file system operations can cause many
+ * calls to the garbage routine to free Flash space (also by erasing physical
+ * Flash blocks) and as a result, many consecutive SUSPEND and RESUME
+ * commands can occur. The problem disappears when a delay is inserted after
+ * the RESUME command by using the udelay() function available in Linux.
+ * The DELAY value must be tuned based on the customer's platform.
+ * The maximum value that fixes the problem in all cases is 500us.
+ * But, in our experience, a delay of 30 µs to 50 µs is sufficient
+ * in most cases.
+ * We have chosen 500µs because this latency is acceptable.
+ */
+static void cfi_fixup_m29ew_delay_after_resume(struct cfi_private *cfi)
+{
+ /*
+ * Resolving the Delay After Resume Issue see Micron TN-13-07
+ * Worst case delay must be 500µs but 30-50µs should be ok as well
+ */
+ if (is_m29ew(cfi))
+ cfi_udelay(500);
}
struct mtd_info *cfi_cmdset_0002(struct map_info *map, int primary)
{
struct cfi_private *cfi = map->fldrv_priv;
+ struct device_node __maybe_unused *np = map->device_node;
struct mtd_info *mtd;
int i;
mtd = kzalloc(sizeof(*mtd), GFP_KERNEL);
- if (!mtd) {
- printk(KERN_WARNING "Failed to allocate memory for MTD device\n");
+ if (!mtd)
return NULL;
- }
mtd->priv = map;
mtd->type = MTD_NORFLASH;
/* Fill in the default mtd operations */
- mtd->erase = cfi_amdstd_erase_varsize;
- mtd->write = cfi_amdstd_write_words;
- mtd->read = cfi_amdstd_read;
- mtd->sync = cfi_amdstd_sync;
- mtd->suspend = cfi_amdstd_suspend;
- mtd->resume = cfi_amdstd_resume;
+ mtd->_erase = cfi_amdstd_erase_varsize;
+ mtd->_write = cfi_amdstd_write_words;
+ mtd->_read = cfi_amdstd_read;
+ mtd->_sync = cfi_amdstd_sync;
+ mtd->_suspend = cfi_amdstd_suspend;
+ mtd->_resume = cfi_amdstd_resume;
mtd->flags = MTD_CAP_NORFLASH;
mtd->name = map->name;
mtd->writesize = 1;
+ mtd->writebufsize = cfi_interleave(cfi) << cfi->cfiq->MaxBufWriteSize;
+
+ pr_debug("MTD %s(): write buffer size %d\n", __func__,
+ mtd->writebufsize);
+
+ mtd->_panic_write = cfi_amdstd_panic_write;
+ mtd->reboot_notifier.notifier_call = cfi_amdstd_reboot;
if (cfi->cfi_mode==CFI_MODE_CFI){
unsigned char bootloc;
- /*
- * It's a real CFI chip, not one for which the probe
- * routine faked a CFI structure. So we read the feature
- * table from it.
- */
__u16 adr = primary?cfi->cfiq->P_ADR:cfi->cfiq->A_ADR;
struct cfi_pri_amdstd *extp;
extp = (struct cfi_pri_amdstd*)cfi_read_pri(map, adr, sizeof(*extp), "Amd/Fujitsu");
- if (!extp) {
- kfree(mtd);
- return NULL;
- }
+ if (extp) {
+ /*
+ * It's a real CFI chip, not one for which the probe
+ * routine faked a CFI structure.
+ */
+ cfi_fixup_major_minor(cfi, extp);
- cfi_fixup_major_minor(cfi, extp);
+ /*
+ * Valid primary extension versions are: 1.0, 1.1, 1.2, 1.3, 1.4, 1.5
+ * see: http://cs.ozerki.net/zap/pub/axim-x5/docs/cfi_r20.pdf, page 19
+ * http://www.spansion.com/Support/AppNotes/cfi_100_20011201.pdf
+ * http://www.spansion.com/Support/Datasheets/s29ws-p_00_a12_e.pdf
+ * http://www.spansion.com/Support/Datasheets/S29GL_128S_01GS_00_02_e.pdf
+ */
+ if (extp->MajorVersion != '1' ||
+ (extp->MajorVersion == '1' && (extp->MinorVersion < '0' || extp->MinorVersion > '5'))) {
+ printk(KERN_ERR " Unknown Amd/Fujitsu Extended Query "
+ "version %c.%c (%#02x/%#02x).\n",
+ extp->MajorVersion, extp->MinorVersion,
+ extp->MajorVersion, extp->MinorVersion);
+ kfree(extp);
+ kfree(mtd);
+ return NULL;
+ }
- if (extp->MajorVersion != '1' ||
- (extp->MinorVersion < '0' || extp->MinorVersion > '4')) {
- printk(KERN_ERR " Unknown Amd/Fujitsu Extended Query "
- "version %c.%c.\n", extp->MajorVersion,
- extp->MinorVersion);
- kfree(extp);
- kfree(mtd);
- return NULL;
- }
+ printk(KERN_INFO " Amd/Fujitsu Extended Query version %c.%c.\n",
+ extp->MajorVersion, extp->MinorVersion);
- /* Install our own private info structure */
- cfi->cmdset_priv = extp;
+ /* Install our own private info structure */
+ cfi->cmdset_priv = extp;
- /* Apply cfi device specific fixups */
- cfi_fixup(mtd, cfi_fixup_table);
+ /* Apply cfi device specific fixups */
+ cfi_fixup(mtd, cfi_fixup_table);
#ifdef DEBUG_CFI_FEATURES
- /* Tell the user about it in lots of lovely detail */
- cfi_tell_features(extp);
+ /* Tell the user about it in lots of lovely detail */
+ cfi_tell_features(extp);
#endif
- bootloc = extp->TopBottom;
- if ((bootloc != 2) && (bootloc != 3)) {
- printk(KERN_WARNING "%s: CFI does not contain boot "
- "bank location. Assuming top.\n", map->name);
- bootloc = 2;
- }
+#ifdef CONFIG_OF
+ if (np && of_property_read_bool(
+ np, "use-advanced-sector-protection")
+ && extp->BlkProtUnprot == 8) {
+ printk(KERN_INFO " Advanced Sector Protection (PPB Locking) supported\n");
+ mtd->_lock = cfi_ppb_lock;
+ mtd->_unlock = cfi_ppb_unlock;
+ mtd->_is_locked = cfi_ppb_is_locked;
+ }
+#endif
- if (bootloc == 3 && cfi->cfiq->NumEraseRegions > 1) {
- printk(KERN_WARNING "%s: Swapping erase regions for broken CFI table.\n", map->name);
+ bootloc = extp->TopBottom;
+ if ((bootloc < 2) || (bootloc > 5)) {
+ printk(KERN_WARNING "%s: CFI contains unrecognised boot "
+ "bank location (%d). Assuming bottom.\n",
+ map->name, bootloc);
+ bootloc = 2;
+ }
+
+ if (bootloc == 3 && cfi->cfiq->NumEraseRegions > 1) {
+ printk(KERN_WARNING "%s: Swapping erase regions for top-boot CFI table.\n", map->name);
- for (i=0; i<cfi->cfiq->NumEraseRegions / 2; i++) {
- int j = (cfi->cfiq->NumEraseRegions-1)-i;
- __u32 swap;
+ for (i=0; i<cfi->cfiq->NumEraseRegions / 2; i++) {
+ int j = (cfi->cfiq->NumEraseRegions-1)-i;
+ __u32 swap;
- swap = cfi->cfiq->EraseRegionInfo[i];
- cfi->cfiq->EraseRegionInfo[i] = cfi->cfiq->EraseRegionInfo[j];
- cfi->cfiq->EraseRegionInfo[j] = swap;
+ swap = cfi->cfiq->EraseRegionInfo[i];
+ cfi->cfiq->EraseRegionInfo[i] = cfi->cfiq->EraseRegionInfo[j];
+ cfi->cfiq->EraseRegionInfo[j] = swap;
+ }
}
+ /* Set the default CFI lock/unlock addresses */
+ cfi->addr_unlock1 = 0x555;
+ cfi->addr_unlock2 = 0x2aa;
+ }
+ cfi_fixup(mtd, cfi_nopri_fixup_table);
+
+ if (!cfi->addr_unlock1 || !cfi->addr_unlock2) {
+ kfree(mtd);
+ return NULL;
}
- /* Set the default CFI lock/unlock addresses */
- cfi->addr_unlock1 = 0x555;
- cfi->addr_unlock2 = 0x2aa;
} /* CFI mode */
else if (cfi->cfi_mode == CFI_MODE_JEDEC) {
@@ -437,7 +636,11 @@ struct mtd_info *cfi_cmdset_0002(struct map_info *map, int primary)
return cfi_amdstd_setup(mtd);
}
+struct mtd_info *cfi_cmdset_0006(struct map_info *map, int primary) __attribute__((alias("cfi_cmdset_0002")));
+struct mtd_info *cfi_cmdset_0701(struct map_info *map, int primary) __attribute__((alias("cfi_cmdset_0002")));
EXPORT_SYMBOL_GPL(cfi_cmdset_0002);
+EXPORT_SYMBOL_GPL(cfi_cmdset_0006);
+EXPORT_SYMBOL_GPL(cfi_cmdset_0701);
static struct mtd_info *cfi_amdstd_setup(struct mtd_info *mtd)
{
@@ -455,10 +658,8 @@ static struct mtd_info *cfi_amdstd_setup(struct mtd_info *mtd)
mtd->numeraseregions = cfi->cfiq->NumEraseRegions * cfi->numchips;
mtd->eraseregions = kmalloc(sizeof(struct mtd_erase_region_info)
* mtd->numeraseregions, GFP_KERNEL);
- if (!mtd->eraseregions) {
- printk(KERN_WARNING "Failed to allocate memory for MTD erase region info\n");
+ if (!mtd->eraseregions)
goto setup_err;
- }
for (i=0; i<cfi->cfiq->NumEraseRegions; i++) {
unsigned long ernum, ersize;
@@ -480,28 +681,14 @@ static struct mtd_info *cfi_amdstd_setup(struct mtd_info *mtd)
printk(KERN_WARNING "Sum of regions (%lx) != total size of set of interleaved chips (%lx)\n", offset, devsize);
goto setup_err;
}
-#if 0
- // debug
- for (i=0; i<mtd->numeraseregions;i++){
- printk("%d: offset=0x%x,size=0x%x,blocks=%d\n",
- i,mtd->eraseregions[i].offset,
- mtd->eraseregions[i].erasesize,
- mtd->eraseregions[i].numblocks);
- }
-#endif
-
- /* FIXME: erase-suspend-program is broken. See
- http://lists.infradead.org/pipermail/linux-mtd/2003-December/009001.html */
- printk(KERN_NOTICE "cfi_cmdset_0002: Disabling erase-suspend-program due to code brokenness.\n");
__module_get(THIS_MODULE);
+ register_reboot_notifier(&mtd->reboot_notifier);
return mtd;
setup_err:
- if(mtd) {
- kfree(mtd->eraseregions);
- kfree(mtd);
- }
+ kfree(mtd->eraseregions);
+ kfree(mtd);
kfree(cfi->cmdset_priv);
kfree(cfi->cfiq);
return NULL;
@@ -515,8 +702,8 @@ static struct mtd_info *cfi_amdstd_setup(struct mtd_info *mtd)
*
* Note that anything more complicated than checking if no bits are toggling
* (including checking DQ5 for an error status) is tricky to get working
- * correctly and is therefore not done (particulary with interleaved chips
- * as each chip must be checked independantly of the others).
+ * correctly and is therefore not done (particularly with interleaved chips
+ * as each chip must be checked independently of the others).
*/
static int __xipram chip_ready(struct map_info *map, unsigned long addr)
{
@@ -539,8 +726,8 @@ static int __xipram chip_ready(struct map_info *map, unsigned long addr)
*
* Note that anything more complicated than checking if no bits are toggling
* (including checking DQ5 for an error status) is tricky to get working
- * correctly and is therefore not done (particulary with interleaved chips
- * as each chip must be checked independantly of the others).
+ * correctly and is therefore not done (particularly with interleaved chips
+ * as each chip must be checked independently of the others).
*
*/
static int __xipram chip_good(struct map_info *map, unsigned long addr, map_word expected)
@@ -573,12 +760,11 @@ static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr
if (time_after(jiffies, timeo)) {
printk(KERN_ERR "Waiting for chip to be ready timed out.\n");
- spin_unlock(chip->mutex);
return -EIO;
}
- spin_unlock(chip->mutex);
+ mutex_unlock(&chip->mutex);
cfi_udelay(1);
- spin_lock(chip->mutex);
+ mutex_lock(&chip->mutex);
/* Someone else might have been playing with it. */
goto retry;
}
@@ -589,15 +775,9 @@ static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr
return 0;
case FL_ERASING:
- if (mode == FL_WRITING) /* FIXME: Erase-suspend-program appears broken. */
- goto sleep;
-
- if (!( mode == FL_READY
- || mode == FL_POINT
- || !cfip
- || (mode == FL_WRITING && (cfip->EraseSuspend & 0x2))
- || (mode == FL_WRITING && (cfip->EraseSuspend & 0x1)
- )))
+ if (!cfip || !(cfip->EraseSuspend & (0x1|0x2)) ||
+ !(mode == FL_READY || mode == FL_POINT ||
+ (mode == FL_WRITING && (cfip->EraseSuspend & 0x2))))
goto sleep;
/* We could check to see if we're trying to access the sector
@@ -621,16 +801,14 @@ static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr
* there was an error (so leave the erase
* routine to recover from it) or we trying to
* use the erase-in-progress sector. */
- map_write(map, CMD(0x30), chip->in_progress_block_addr);
- chip->state = FL_ERASING;
- chip->oldstate = FL_READY;
+ put_chip(map, chip, adr);
printk(KERN_ERR "MTD %s(): chip not ready after erase suspend\n", __func__);
return -EIO;
}
- spin_unlock(chip->mutex);
+ mutex_unlock(&chip->mutex);
cfi_udelay(1);
- spin_lock(chip->mutex);
+ mutex_lock(&chip->mutex);
/* Nobody will touch it while it's in state FL_ERASE_SUSPENDING.
So we can just loop here. */
}
@@ -645,6 +823,10 @@ static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr
chip->state = FL_READY;
return 0;
+ case FL_SHUTDOWN:
+ /* The machine is rebooting */
+ return -EIO;
+
case FL_POINT:
/* Only if there's no operation suspended... */
if (mode == FL_READY && chip->oldstate == FL_READY)
@@ -654,10 +836,10 @@ static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr
sleep:
set_current_state(TASK_UNINTERRUPTIBLE);
add_wait_queue(&chip->wq, &wait);
- spin_unlock(chip->mutex);
+ mutex_unlock(&chip->mutex);
schedule();
remove_wait_queue(&chip->wq, &wait);
- spin_lock(chip->mutex);
+ mutex_lock(&chip->mutex);
goto resettime;
}
}
@@ -669,8 +851,10 @@ static void put_chip(struct map_info *map, struct flchip *chip, unsigned long ad
switch(chip->oldstate) {
case FL_ERASING:
- chip->state = chip->oldstate;
- map_write(map, CMD(0x30), chip->in_progress_block_addr);
+ cfi_fixup_m29ew_erase_suspend(map,
+ chip->in_progress_block_addr);
+ map_write(map, cfi->sector_erase_cmd, chip->in_progress_block_addr);
+ cfi_fixup_m29ew_delay_after_resume(cfi);
chip->oldstate = FL_READY;
chip->state = FL_ERASING;
break;
@@ -682,8 +866,6 @@ static void put_chip(struct map_info *map, struct flchip *chip, unsigned long ad
case FL_READY:
case FL_STATUS:
- /* We should really make set_vpp() count, rather than doing this */
- DISABLE_VPP(map);
break;
default:
printk(KERN_ERR "MTD: put_chip() called with oldstate %d!!\n", chip->oldstate);
@@ -789,7 +971,7 @@ static void __xipram xip_udelay(struct map_info *map, struct flchip *chip,
(void) map_read(map, adr);
xip_iprefetch();
local_irq_enable();
- spin_unlock(chip->mutex);
+ mutex_unlock(&chip->mutex);
xip_iprefetch();
cond_resched();
@@ -799,21 +981,23 @@ static void __xipram xip_udelay(struct map_info *map, struct flchip *chip,
* a suspended erase state. If so let's wait
* until it's done.
*/
- spin_lock(chip->mutex);
+ mutex_lock(&chip->mutex);
while (chip->state != FL_XIP_WHILE_ERASING) {
DECLARE_WAITQUEUE(wait, current);
set_current_state(TASK_UNINTERRUPTIBLE);
add_wait_queue(&chip->wq, &wait);
- spin_unlock(chip->mutex);
+ mutex_unlock(&chip->mutex);
schedule();
remove_wait_queue(&chip->wq, &wait);
- spin_lock(chip->mutex);
+ mutex_lock(&chip->mutex);
}
/* Disallow XIP again */
local_irq_disable();
+ /* Correct Erase Suspend Hangups for M29EW */
+ cfi_fixup_m29ew_erase_suspend(map, adr);
/* Resume the write or erase operation */
- map_write(map, CMD(0x30), adr);
+ map_write(map, cfi->sector_erase_cmd, adr);
chip->state = oldstate;
start = xip_currtime();
} else if (usec >= 1000000/HZ) {
@@ -869,17 +1053,17 @@ static void __xipram xip_udelay(struct map_info *map, struct flchip *chip,
#define UDELAY(map, chip, adr, usec) \
do { \
- spin_unlock(chip->mutex); \
+ mutex_unlock(&chip->mutex); \
cfi_udelay(usec); \
- spin_lock(chip->mutex); \
+ mutex_lock(&chip->mutex); \
} while (0)
#define INVALIDATE_CACHE_UDELAY(map, chip, adr, len, usec) \
do { \
- spin_unlock(chip->mutex); \
+ mutex_unlock(&chip->mutex); \
INVALIDATE_CACHED_RANGE(map, adr, len); \
cfi_udelay(usec); \
- spin_lock(chip->mutex); \
+ mutex_lock(&chip->mutex); \
} while (0)
#endif
@@ -895,10 +1079,10 @@ static inline int do_read_onechip(struct map_info *map, struct flchip *chip, lof
/* Ensure cmd read/writes are aligned. */
cmd_addr = adr & ~(map_bankwidth(map)-1);
- spin_lock(chip->mutex);
+ mutex_lock(&chip->mutex);
ret = get_chip(map, chip, cmd_addr, FL_READY);
if (ret) {
- spin_unlock(chip->mutex);
+ mutex_unlock(&chip->mutex);
return ret;
}
@@ -911,7 +1095,7 @@ static inline int do_read_onechip(struct map_info *map, struct flchip *chip, lof
put_chip(map, chip, cmd_addr);
- spin_unlock(chip->mutex);
+ mutex_unlock(&chip->mutex);
return 0;
}
@@ -925,13 +1109,9 @@ static int cfi_amdstd_read (struct mtd_info *mtd, loff_t from, size_t len, size_
int ret = 0;
/* ofs: offset within the first chip that the first read should start */
-
chipnum = (from >> cfi->chipshift);
ofs = from - (chipnum << cfi->chipshift);
-
- *retlen = 0;
-
while (len) {
unsigned long thislen;
@@ -965,23 +1145,16 @@ static inline int do_read_secsi_onechip(struct map_info *map, struct flchip *chi
struct cfi_private *cfi = map->fldrv_priv;
retry:
- spin_lock(chip->mutex);
+ mutex_lock(&chip->mutex);
if (chip->state != FL_READY){
-#if 0
- printk(KERN_DEBUG "Waiting for chip to read, status = %d\n", chip->state);
-#endif
set_current_state(TASK_UNINTERRUPTIBLE);
add_wait_queue(&chip->wq, &wait);
- spin_unlock(chip->mutex);
+ mutex_unlock(&chip->mutex);
schedule();
remove_wait_queue(&chip->wq, &wait);
-#if 0
- if(signal_pending(current))
- return -EINTR;
-#endif
timeo = jiffies + HZ;
goto retry;
@@ -1003,7 +1176,7 @@ static inline int do_read_secsi_onechip(struct map_info *map, struct flchip *chi
cfi_send_gen_cmd(0x00, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL);
wake_up(&chip->wq);
- spin_unlock(chip->mutex);
+ mutex_unlock(&chip->mutex);
return 0;
}
@@ -1016,16 +1189,11 @@ static int cfi_amdstd_secsi_read (struct mtd_info *mtd, loff_t from, size_t len,
int chipnum;
int ret = 0;
-
/* ofs: offset within the first chip that the first read should start */
-
/* 8 secsi bytes per chip */
chipnum=from>>3;
ofs=from & 7;
-
- *retlen = 0;
-
while (len) {
unsigned long thislen;
@@ -1072,14 +1240,14 @@ static int __xipram do_write_oneword(struct map_info *map, struct flchip *chip,
adr += chip->start;
- spin_lock(chip->mutex);
+ mutex_lock(&chip->mutex);
ret = get_chip(map, chip, adr, FL_WRITING);
if (ret) {
- spin_unlock(chip->mutex);
+ mutex_unlock(&chip->mutex);
return ret;
}
- DEBUG( MTD_DEBUG_LEVEL3, "MTD %s(): WRITE 0x%.8lx(0x%.8lx)\n",
+ pr_debug("MTD %s(): WRITE 0x%.8lx(0x%.8lx)\n",
__func__, adr, datum.x[0] );
/*
@@ -1090,7 +1258,7 @@ static int __xipram do_write_oneword(struct map_info *map, struct flchip *chip,
*/
oldd = map_read(map, adr);
if (map_word_equal(map, oldd, datum)) {
- DEBUG( MTD_DEBUG_LEVEL3, "MTD %s(): NOP\n",
+ pr_debug("MTD %s(): NOP\n",
__func__);
goto op_done;
}
@@ -1118,11 +1286,11 @@ static int __xipram do_write_oneword(struct map_info *map, struct flchip *chip,
set_current_state(TASK_UNINTERRUPTIBLE);
add_wait_queue(&chip->wq, &wait);
- spin_unlock(chip->mutex);
+ mutex_unlock(&chip->mutex);
schedule();
remove_wait_queue(&chip->wq, &wait);
timeo = jiffies + (HZ / 2); /* FIXME */
- spin_lock(chip->mutex);
+ mutex_lock(&chip->mutex);
continue;
}
@@ -1153,8 +1321,9 @@ static int __xipram do_write_oneword(struct map_info *map, struct flchip *chip,
xip_enable(map, chip, adr);
op_done:
chip->state = FL_READY;
+ DISABLE_VPP(map);
put_chip(map, chip, adr);
- spin_unlock(chip->mutex);
+ mutex_unlock(&chip->mutex);
return ret;
}
@@ -1170,10 +1339,6 @@ static int cfi_amdstd_write_words(struct mtd_info *mtd, loff_t to, size_t len,
unsigned long ofs, chipstart;
DECLARE_WAITQUEUE(wait, current);
- *retlen = 0;
- if (!len)
- return 0;
-
chipnum = to >> cfi->chipshift;
ofs = to - (chipnum << cfi->chipshift);
chipstart = cfi->chips[chipnum].start;
@@ -1186,30 +1351,23 @@ static int cfi_amdstd_write_words(struct mtd_info *mtd, loff_t to, size_t len,
map_word tmp_buf;
retry:
- spin_lock(cfi->chips[chipnum].mutex);
+ mutex_lock(&cfi->chips[chipnum].mutex);
if (cfi->chips[chipnum].state != FL_READY) {
-#if 0
- printk(KERN_DEBUG "Waiting for chip to write, status = %d\n", cfi->chips[chipnum].state);
-#endif
set_current_state(TASK_UNINTERRUPTIBLE);
add_wait_queue(&cfi->chips[chipnum].wq, &wait);
- spin_unlock(cfi->chips[chipnum].mutex);
+ mutex_unlock(&cfi->chips[chipnum].mutex);
schedule();
remove_wait_queue(&cfi->chips[chipnum].wq, &wait);
-#if 0
- if(signal_pending(current))
- return -EINTR;
-#endif
goto retry;
}
/* Load 'tmp_buf' with old contents of flash */
tmp_buf = map_read(map, bus_ofs+chipstart);
- spin_unlock(cfi->chips[chipnum].mutex);
+ mutex_unlock(&cfi->chips[chipnum].mutex);
/* Number of bytes to copy from buffer */
n = min_t(int, len, map_bankwidth(map)-i);
@@ -1264,29 +1422,22 @@ static int cfi_amdstd_write_words(struct mtd_info *mtd, loff_t to, size_t len,
map_word tmp_buf;
retry1:
- spin_lock(cfi->chips[chipnum].mutex);
+ mutex_lock(&cfi->chips[chipnum].mutex);
if (cfi->chips[chipnum].state != FL_READY) {
-#if 0
- printk(KERN_DEBUG "Waiting for chip to write, status = %d\n", cfi->chips[chipnum].state);
-#endif
set_current_state(TASK_UNINTERRUPTIBLE);
add_wait_queue(&cfi->chips[chipnum].wq, &wait);
- spin_unlock(cfi->chips[chipnum].mutex);
+ mutex_unlock(&cfi->chips[chipnum].mutex);
schedule();
remove_wait_queue(&cfi->chips[chipnum].wq, &wait);
-#if 0
- if(signal_pending(current))
- return -EINTR;
-#endif
goto retry1;
}
tmp_buf = map_read(map, ofs + chipstart);
- spin_unlock(cfi->chips[chipnum].mutex);
+ mutex_unlock(&cfi->chips[chipnum].mutex);
tmp_buf = map_word_load_partial(map, tmp_buf, buf, 0, len);
@@ -1321,16 +1472,16 @@ static int __xipram do_write_buffer(struct map_info *map, struct flchip *chip,
adr += chip->start;
cmd_adr = adr;
- spin_lock(chip->mutex);
+ mutex_lock(&chip->mutex);
ret = get_chip(map, chip, adr, FL_WRITING);
if (ret) {
- spin_unlock(chip->mutex);
+ mutex_unlock(&chip->mutex);
return ret;
}
datum = map_word_load(map, buf);
- DEBUG( MTD_DEBUG_LEVEL3, "MTD %s(): WRITE 0x%.8lx(0x%.8lx)\n",
+ pr_debug("MTD %s(): WRITE 0x%.8lx(0x%.8lx)\n",
__func__, adr, datum.x[0] );
XIP_INVAL_CACHED_RANGE(map, adr, len);
@@ -1339,7 +1490,6 @@ static int __xipram do_write_buffer(struct map_info *map, struct flchip *chip,
cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL);
cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, cfi->device_type, NULL);
- //cfi_send_gen_cmd(0xA0, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL);
/* Write Buffer Load */
map_write(map, CMD(0x25), cmd_adr);
@@ -1379,11 +1529,11 @@ static int __xipram do_write_buffer(struct map_info *map, struct flchip *chip,
set_current_state(TASK_UNINTERRUPTIBLE);
add_wait_queue(&chip->wq, &wait);
- spin_unlock(chip->mutex);
+ mutex_unlock(&chip->mutex);
schedule();
remove_wait_queue(&chip->wq, &wait);
timeo = jiffies + (HZ / 2); /* FIXME */
- spin_lock(chip->mutex);
+ mutex_lock(&chip->mutex);
continue;
}
@@ -1399,19 +1549,32 @@ static int __xipram do_write_buffer(struct map_info *map, struct flchip *chip,
UDELAY(map, chip, adr, 1);
}
- /* reset on all failures. */
- map_write( map, CMD(0xF0), chip->start );
+ /*
+ * Recovery from write-buffer programming failures requires
+ * the write-to-buffer-reset sequence. Since the last part
+ * of the sequence also works as a normal reset, we can run
+ * the same commands regardless of why we are here.
+ * See e.g.
+ * http://www.spansion.com/Support/Application%20Notes/MirrorBit_Write_Buffer_Prog_Page_Buffer_Read_AN.pdf
+ */
+ cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi,
+ cfi->device_type, NULL);
+ cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi,
+ cfi->device_type, NULL);
+ cfi_send_gen_cmd(0xF0, cfi->addr_unlock1, chip->start, map, cfi,
+ cfi->device_type, NULL);
xip_enable(map, chip, adr);
/* FIXME - should have reset delay before continuing */
- printk(KERN_WARNING "MTD %s(): software timeout\n",
- __func__ );
+ printk(KERN_WARNING "MTD %s(): software timeout, address:0x%.8lx.\n",
+ __func__, adr);
ret = -EIO;
op_done:
chip->state = FL_READY;
+ DISABLE_VPP(map);
put_chip(map, chip, adr);
- spin_unlock(chip->mutex);
+ mutex_unlock(&chip->mutex);
return ret;
}
@@ -1427,10 +1590,6 @@ static int cfi_amdstd_write_buffers(struct mtd_info *mtd, loff_t to, size_t len,
int chipnum;
unsigned long ofs;
- *retlen = 0;
- if (!len)
- return 0;
-
chipnum = to >> cfi->chipshift;
ofs = to - (chipnum << cfi->chipshift);
@@ -1496,6 +1655,238 @@ static int cfi_amdstd_write_buffers(struct mtd_info *mtd, loff_t to, size_t len,
return 0;
}
+/*
+ * Wait for the flash chip to become ready to write data
+ *
+ * This is only called during the panic_write() path. When panic_write()
+ * is called, the kernel is in the process of a panic, and will soon be
+ * dead. Therefore we don't take any locks, and attempt to get access
+ * to the chip as soon as possible.
+ */
+static int cfi_amdstd_panic_wait(struct map_info *map, struct flchip *chip,
+ unsigned long adr)
+{
+ struct cfi_private *cfi = map->fldrv_priv;
+ int retries = 10;
+ int i;
+
+ /*
+ * If the driver thinks the chip is idle, and no toggle bits
+ * are changing, then the chip is actually idle for sure.
+ */
+ if (chip->state == FL_READY && chip_ready(map, adr))
+ return 0;
+
+ /*
+ * Try several times to reset the chip and then wait for it
+ * to become idle. The upper limit of a few milliseconds of
+ * delay isn't a big problem: the kernel is dying anyway. It
+ * is more important to save the messages.
+ */
+ while (retries > 0) {
+ const unsigned long timeo = (HZ / 1000) + 1;
+
+ /* send the reset command */
+ map_write(map, CMD(0xF0), chip->start);
+
+ /* wait for the chip to become ready */
+ for (i = 0; i < jiffies_to_usecs(timeo); i++) {
+ if (chip_ready(map, adr))
+ return 0;
+
+ udelay(1);
+ }
+ }
+
+ /* the chip never became ready */
+ return -EBUSY;
+}
+
+/*
+ * Write out one word of data to a single flash chip during a kernel panic
+ *
+ * This is only called during the panic_write() path. When panic_write()
+ * is called, the kernel is in the process of a panic, and will soon be
+ * dead. Therefore we don't take any locks, and attempt to get access
+ * to the chip as soon as possible.
+ *
+ * The implementation of this routine is intentionally similar to
+ * do_write_oneword(), in order to ease code maintenance.
+ */
+static int do_panic_write_oneword(struct map_info *map, struct flchip *chip,
+ unsigned long adr, map_word datum)
+{
+ const unsigned long uWriteTimeout = (HZ / 1000) + 1;
+ struct cfi_private *cfi = map->fldrv_priv;
+ int retry_cnt = 0;
+ map_word oldd;
+ int ret = 0;
+ int i;
+
+ adr += chip->start;
+
+ ret = cfi_amdstd_panic_wait(map, chip, adr);
+ if (ret)
+ return ret;
+
+ pr_debug("MTD %s(): PANIC WRITE 0x%.8lx(0x%.8lx)\n",
+ __func__, adr, datum.x[0]);
+
+ /*
+ * Check for a NOP for the case when the datum to write is already
+ * present - it saves time and works around buggy chips that corrupt
+ * data at other locations when 0xff is written to a location that
+ * already contains 0xff.
+ */
+ oldd = map_read(map, adr);
+ if (map_word_equal(map, oldd, datum)) {
+ pr_debug("MTD %s(): NOP\n", __func__);
+ goto op_done;
+ }
+
+ ENABLE_VPP(map);
+
+retry:
+ cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL);
+ cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, cfi->device_type, NULL);
+ cfi_send_gen_cmd(0xA0, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL);
+ map_write(map, datum, adr);
+
+ for (i = 0; i < jiffies_to_usecs(uWriteTimeout); i++) {
+ if (chip_ready(map, adr))
+ break;
+
+ udelay(1);
+ }
+
+ if (!chip_good(map, adr, datum)) {
+ /* reset on all failures. */
+ map_write(map, CMD(0xF0), chip->start);
+ /* FIXME - should have reset delay before continuing */
+
+ if (++retry_cnt <= MAX_WORD_RETRIES)
+ goto retry;
+
+ ret = -EIO;
+ }
+
+op_done:
+ DISABLE_VPP(map);
+ return ret;
+}
+
+/*
+ * Write out some data during a kernel panic
+ *
+ * This is used by the mtdoops driver to save the dying messages from a
+ * kernel which has panic'd.
+ *
+ * This routine ignores all of the locking used throughout the rest of the
+ * driver, in order to ensure that the data gets written out no matter what
+ * state this driver (and the flash chip itself) was in when the kernel crashed.
+ *
+ * The implementation of this routine is intentionally similar to
+ * cfi_amdstd_write_words(), in order to ease code maintenance.
+ */
+static int cfi_amdstd_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
+ size_t *retlen, const u_char *buf)
+{
+ struct map_info *map = mtd->priv;
+ struct cfi_private *cfi = map->fldrv_priv;
+ unsigned long ofs, chipstart;
+ int ret = 0;
+ int chipnum;
+
+ chipnum = to >> cfi->chipshift;
+ ofs = to - (chipnum << cfi->chipshift);
+ chipstart = cfi->chips[chipnum].start;
+
+ /* If it's not bus aligned, do the first byte write */
+ if (ofs & (map_bankwidth(map) - 1)) {
+ unsigned long bus_ofs = ofs & ~(map_bankwidth(map) - 1);
+ int i = ofs - bus_ofs;
+ int n = 0;
+ map_word tmp_buf;
+
+ ret = cfi_amdstd_panic_wait(map, &cfi->chips[chipnum], bus_ofs);
+ if (ret)
+ return ret;
+
+ /* Load 'tmp_buf' with old contents of flash */
+ tmp_buf = map_read(map, bus_ofs + chipstart);
+
+ /* Number of bytes to copy from buffer */
+ n = min_t(int, len, map_bankwidth(map) - i);
+
+ tmp_buf = map_word_load_partial(map, tmp_buf, buf, i, n);
+
+ ret = do_panic_write_oneword(map, &cfi->chips[chipnum],
+ bus_ofs, tmp_buf);
+ if (ret)
+ return ret;
+
+ ofs += n;
+ buf += n;
+ (*retlen) += n;
+ len -= n;
+
+ if (ofs >> cfi->chipshift) {
+ chipnum++;
+ ofs = 0;
+ if (chipnum == cfi->numchips)
+ return 0;
+ }
+ }
+
+ /* We are now aligned, write as much as possible */
+ while (len >= map_bankwidth(map)) {
+ map_word datum;
+
+ datum = map_word_load(map, buf);
+
+ ret = do_panic_write_oneword(map, &cfi->chips[chipnum],
+ ofs, datum);
+ if (ret)
+ return ret;
+
+ ofs += map_bankwidth(map);
+ buf += map_bankwidth(map);
+ (*retlen) += map_bankwidth(map);
+ len -= map_bankwidth(map);
+
+ if (ofs >> cfi->chipshift) {
+ chipnum++;
+ ofs = 0;
+ if (chipnum == cfi->numchips)
+ return 0;
+
+ chipstart = cfi->chips[chipnum].start;
+ }
+ }
+
+ /* Write the trailing bytes if any */
+ if (len & (map_bankwidth(map) - 1)) {
+ map_word tmp_buf;
+
+ ret = cfi_amdstd_panic_wait(map, &cfi->chips[chipnum], ofs);
+ if (ret)
+ return ret;
+
+ tmp_buf = map_read(map, ofs + chipstart);
+
+ tmp_buf = map_word_load_partial(map, tmp_buf, buf, 0, len);
+
+ ret = do_panic_write_oneword(map, &cfi->chips[chipnum],
+ ofs, tmp_buf);
+ if (ret)
+ return ret;
+
+ (*retlen) += len;
+ }
+
+ return 0;
+}
+
/*
* Handle devices with one erase region, that only implement
@@ -1511,14 +1902,14 @@ static int __xipram do_erase_chip(struct map_info *map, struct flchip *chip)
adr = cfi->addr_unlock1;
- spin_lock(chip->mutex);
+ mutex_lock(&chip->mutex);
ret = get_chip(map, chip, adr, FL_WRITING);
if (ret) {
- spin_unlock(chip->mutex);
+ mutex_unlock(&chip->mutex);
return ret;
}
- DEBUG( MTD_DEBUG_LEVEL3, "MTD %s(): ERASE 0x%.8lx\n",
+ pr_debug("MTD %s(): ERASE 0x%.8lx\n",
__func__, chip->start );
XIP_INVAL_CACHED_RANGE(map, adr, map->size);
@@ -1547,10 +1938,10 @@ static int __xipram do_erase_chip(struct map_info *map, struct flchip *chip)
/* Someone's suspended the erase. Sleep */
set_current_state(TASK_UNINTERRUPTIBLE);
add_wait_queue(&chip->wq, &wait);
- spin_unlock(chip->mutex);
+ mutex_unlock(&chip->mutex);
schedule();
remove_wait_queue(&chip->wq, &wait);
- spin_lock(chip->mutex);
+ mutex_lock(&chip->mutex);
continue;
}
if (chip->erase_suspended) {
@@ -1583,8 +1974,9 @@ static int __xipram do_erase_chip(struct map_info *map, struct flchip *chip)
chip->state = FL_READY;
xip_enable(map, chip, adr);
+ DISABLE_VPP(map);
put_chip(map, chip, adr);
- spin_unlock(chip->mutex);
+ mutex_unlock(&chip->mutex);
return ret;
}
@@ -1599,14 +1991,14 @@ static int __xipram do_erase_oneblock(struct map_info *map, struct flchip *chip,
adr += chip->start;
- spin_lock(chip->mutex);
+ mutex_lock(&chip->mutex);
ret = get_chip(map, chip, adr, FL_ERASING);
if (ret) {
- spin_unlock(chip->mutex);
+ mutex_unlock(&chip->mutex);
return ret;
}
- DEBUG( MTD_DEBUG_LEVEL3, "MTD %s(): ERASE 0x%.8lx\n",
+ pr_debug("MTD %s(): ERASE 0x%.8lx\n",
__func__, adr );
XIP_INVAL_CACHED_RANGE(map, adr, len);
@@ -1618,7 +2010,7 @@ static int __xipram do_erase_oneblock(struct map_info *map, struct flchip *chip,
cfi_send_gen_cmd(0x80, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL);
cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL);
cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, cfi->device_type, NULL);
- map_write(map, CMD(0x30), adr);
+ map_write(map, cfi->sector_erase_cmd, adr);
chip->state = FL_ERASING;
chip->erase_suspended = 0;
@@ -1635,10 +2027,10 @@ static int __xipram do_erase_oneblock(struct map_info *map, struct flchip *chip,
/* Someone's suspended the erase. Sleep */
set_current_state(TASK_UNINTERRUPTIBLE);
add_wait_queue(&chip->wq, &wait);
- spin_unlock(chip->mutex);
+ mutex_unlock(&chip->mutex);
schedule();
remove_wait_queue(&chip->wq, &wait);
- spin_lock(chip->mutex);
+ mutex_lock(&chip->mutex);
continue;
}
if (chip->erase_suspended) {
@@ -1673,8 +2065,9 @@ static int __xipram do_erase_oneblock(struct map_info *map, struct flchip *chip,
}
chip->state = FL_READY;
+ DISABLE_VPP(map);
put_chip(map, chip, adr);
- spin_unlock(chip->mutex);
+ mutex_unlock(&chip->mutex);
return ret;
}
@@ -1726,14 +2119,13 @@ static int do_atmel_lock(struct map_info *map, struct flchip *chip,
struct cfi_private *cfi = map->fldrv_priv;
int ret;
- spin_lock(chip->mutex);
+ mutex_lock(&chip->mutex);
ret = get_chip(map, chip, adr + chip->start, FL_LOCKING);
if (ret)
goto out_unlock;
chip->state = FL_LOCKING;
- DEBUG(MTD_DEBUG_LEVEL3, "MTD %s(): LOCK 0x%08lx len %d\n",
- __func__, adr, len);
+ pr_debug("MTD %s(): LOCK 0x%08lx len %d\n", __func__, adr, len);
cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi,
cfi->device_type, NULL);
@@ -1752,7 +2144,7 @@ static int do_atmel_lock(struct map_info *map, struct flchip *chip,
ret = 0;
out_unlock:
- spin_unlock(chip->mutex);
+ mutex_unlock(&chip->mutex);
return ret;
}
@@ -1762,14 +2154,13 @@ static int do_atmel_unlock(struct map_info *map, struct flchip *chip,
struct cfi_private *cfi = map->fldrv_priv;
int ret;
- spin_lock(chip->mutex);
+ mutex_lock(&chip->mutex);
ret = get_chip(map, chip, adr + chip->start, FL_UNLOCKING);
if (ret)
goto out_unlock;
chip->state = FL_UNLOCKING;
- DEBUG(MTD_DEBUG_LEVEL3, "MTD %s(): LOCK 0x%08lx len %d\n",
- __func__, adr, len);
+ pr_debug("MTD %s(): LOCK 0x%08lx len %d\n", __func__, adr, len);
cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi,
cfi->device_type, NULL);
@@ -1780,7 +2171,7 @@ static int do_atmel_unlock(struct map_info *map, struct flchip *chip,
ret = 0;
out_unlock:
- spin_unlock(chip->mutex);
+ mutex_unlock(&chip->mutex);
return ret;
}
@@ -1794,6 +2185,205 @@ static int cfi_atmel_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
return cfi_varsize_frob(mtd, do_atmel_unlock, ofs, len, NULL);
}
+/*
+ * Advanced Sector Protection - PPB (Persistent Protection Bit) locking
+ */
+
+struct ppb_lock {
+ struct flchip *chip;
+ loff_t offset;
+ int locked;
+};
+
+#define MAX_SECTORS 512
+
+#define DO_XXLOCK_ONEBLOCK_LOCK ((void *)1)
+#define DO_XXLOCK_ONEBLOCK_UNLOCK ((void *)2)
+#define DO_XXLOCK_ONEBLOCK_GETLOCK ((void *)3)
+
+static int __maybe_unused do_ppb_xxlock(struct map_info *map,
+ struct flchip *chip,
+ unsigned long adr, int len, void *thunk)
+{
+ struct cfi_private *cfi = map->fldrv_priv;
+ unsigned long timeo;
+ int ret;
+
+ mutex_lock(&chip->mutex);
+ ret = get_chip(map, chip, adr + chip->start, FL_LOCKING);
+ if (ret) {
+ mutex_unlock(&chip->mutex);
+ return ret;
+ }
+
+ pr_debug("MTD %s(): XXLOCK 0x%08lx len %d\n", __func__, adr, len);
+
+ cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi,
+ cfi->device_type, NULL);
+ cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi,
+ cfi->device_type, NULL);
+ /* PPB entry command */
+ cfi_send_gen_cmd(0xC0, cfi->addr_unlock1, chip->start, map, cfi,
+ cfi->device_type, NULL);
+
+ if (thunk == DO_XXLOCK_ONEBLOCK_LOCK) {
+ chip->state = FL_LOCKING;
+ map_write(map, CMD(0xA0), chip->start + adr);
+ map_write(map, CMD(0x00), chip->start + adr);
+ } else if (thunk == DO_XXLOCK_ONEBLOCK_UNLOCK) {
+ /*
+ * Unlocking of one specific sector is not supported, so we
+ * have to unlock all sectors of this device instead
+ */
+ chip->state = FL_UNLOCKING;
+ map_write(map, CMD(0x80), chip->start);
+ map_write(map, CMD(0x30), chip->start);
+ } else if (thunk == DO_XXLOCK_ONEBLOCK_GETLOCK) {
+ chip->state = FL_JEDEC_QUERY;
+ /* Return locked status: 0->locked, 1->unlocked */
+ ret = !cfi_read_query(map, adr);
+ } else
+ BUG();
+
+ /*
+ * Wait for some time as unlocking of all sectors takes quite long
+ */
+ timeo = jiffies + msecs_to_jiffies(2000); /* 2s max (un)locking */
+ for (;;) {
+ if (chip_ready(map, adr))
+ break;
+
+ if (time_after(jiffies, timeo)) {
+ printk(KERN_ERR "Waiting for chip to be ready timed out.\n");
+ ret = -EIO;
+ break;
+ }
+
+ UDELAY(map, chip, adr, 1);
+ }
+
+ /* Exit BC commands */
+ map_write(map, CMD(0x90), chip->start);
+ map_write(map, CMD(0x00), chip->start);
+
+ chip->state = FL_READY;
+ put_chip(map, chip, adr + chip->start);
+ mutex_unlock(&chip->mutex);
+
+ return ret;
+}
+
+static int __maybe_unused cfi_ppb_lock(struct mtd_info *mtd, loff_t ofs,
+ uint64_t len)
+{
+ return cfi_varsize_frob(mtd, do_ppb_xxlock, ofs, len,
+ DO_XXLOCK_ONEBLOCK_LOCK);
+}
+
+static int __maybe_unused cfi_ppb_unlock(struct mtd_info *mtd, loff_t ofs,
+ uint64_t len)
+{
+ struct mtd_erase_region_info *regions = mtd->eraseregions;
+ struct map_info *map = mtd->priv;
+ struct cfi_private *cfi = map->fldrv_priv;
+ struct ppb_lock *sect;
+ unsigned long adr;
+ loff_t offset;
+ uint64_t length;
+ int chipnum;
+ int i;
+ int sectors;
+ int ret;
+
+ /*
+ * PPB unlocking always unlocks all sectors of the flash chip.
+ * We need to re-lock all previously locked sectors. So lets
+ * first check the locking status of all sectors and save
+ * it for future use.
+ */
+ sect = kzalloc(MAX_SECTORS * sizeof(struct ppb_lock), GFP_KERNEL);
+ if (!sect)
+ return -ENOMEM;
+
+ /*
+ * This code to walk all sectors is a slightly modified version
+ * of the cfi_varsize_frob() code.
+ */
+ i = 0;
+ chipnum = 0;
+ adr = 0;
+ sectors = 0;
+ offset = 0;
+ length = mtd->size;
+
+ while (length) {
+ int size = regions[i].erasesize;
+
+ /*
+ * Only test sectors that shall not be unlocked. The other
+ * sectors shall be unlocked, so lets keep their locking
+ * status at "unlocked" (locked=0) for the final re-locking.
+ */
+ if ((adr < ofs) || (adr >= (ofs + len))) {
+ sect[sectors].chip = &cfi->chips[chipnum];
+ sect[sectors].offset = offset;
+ sect[sectors].locked = do_ppb_xxlock(
+ map, &cfi->chips[chipnum], adr, 0,
+ DO_XXLOCK_ONEBLOCK_GETLOCK);
+ }
+
+ adr += size;
+ offset += size;
+ length -= size;
+
+ if (offset == regions[i].offset + size * regions[i].numblocks)
+ i++;
+
+ if (adr >> cfi->chipshift) {
+ adr = 0;
+ chipnum++;
+
+ if (chipnum >= cfi->numchips)
+ break;
+ }
+
+ sectors++;
+ if (sectors >= MAX_SECTORS) {
+ printk(KERN_ERR "Only %d sectors for PPB locking supported!\n",
+ MAX_SECTORS);
+ kfree(sect);
+ return -EINVAL;
+ }
+ }
+
+ /* Now unlock the whole chip */
+ ret = cfi_varsize_frob(mtd, do_ppb_xxlock, ofs, len,
+ DO_XXLOCK_ONEBLOCK_UNLOCK);
+ if (ret) {
+ kfree(sect);
+ return ret;
+ }
+
+ /*
+ * PPB unlocking always unlocks all sectors of the flash chip.
+ * We need to re-lock all previously locked sectors.
+ */
+ for (i = 0; i < sectors; i++) {
+ if (sect[i].locked)
+ do_ppb_xxlock(map, sect[i].chip, sect[i].offset, 0,
+ DO_XXLOCK_ONEBLOCK_LOCK);
+ }
+
+ kfree(sect);
+ return ret;
+}
+
+static int __maybe_unused cfi_ppb_is_locked(struct mtd_info *mtd, loff_t ofs,
+ uint64_t len)
+{
+ return cfi_varsize_frob(mtd, do_ppb_xxlock, ofs, len,
+ DO_XXLOCK_ONEBLOCK_GETLOCK) ? 1 : 0;
+}
static void cfi_amdstd_sync (struct mtd_info *mtd)
{
@@ -1808,7 +2398,7 @@ static void cfi_amdstd_sync (struct mtd_info *mtd)
chip = &cfi->chips[i];
retry:
- spin_lock(chip->mutex);
+ mutex_lock(&chip->mutex);
switch(chip->state) {
case FL_READY:
@@ -1822,7 +2412,7 @@ static void cfi_amdstd_sync (struct mtd_info *mtd)
* with the chip now anyway.
*/
case FL_SYNCING:
- spin_unlock(chip->mutex);
+ mutex_unlock(&chip->mutex);
break;
default:
@@ -1830,7 +2420,7 @@ static void cfi_amdstd_sync (struct mtd_info *mtd)
set_current_state(TASK_UNINTERRUPTIBLE);
add_wait_queue(&chip->wq, &wait);
- spin_unlock(chip->mutex);
+ mutex_unlock(&chip->mutex);
schedule();
@@ -1845,13 +2435,13 @@ static void cfi_amdstd_sync (struct mtd_info *mtd)
for (i--; i >=0; i--) {
chip = &cfi->chips[i];
- spin_lock(chip->mutex);
+ mutex_lock(&chip->mutex);
if (chip->state == FL_SYNCING) {
chip->state = chip->oldstate;
wake_up(&chip->wq);
}
- spin_unlock(chip->mutex);
+ mutex_unlock(&chip->mutex);
}
}
@@ -1867,7 +2457,7 @@ static int cfi_amdstd_suspend(struct mtd_info *mtd)
for (i=0; !ret && i<cfi->numchips; i++) {
chip = &cfi->chips[i];
- spin_lock(chip->mutex);
+ mutex_lock(&chip->mutex);
switch(chip->state) {
case FL_READY:
@@ -1887,7 +2477,7 @@ static int cfi_amdstd_suspend(struct mtd_info *mtd)
ret = -EAGAIN;
break;
}
- spin_unlock(chip->mutex);
+ mutex_unlock(&chip->mutex);
}
/* Unlock the chips again */
@@ -1896,13 +2486,13 @@ static int cfi_amdstd_suspend(struct mtd_info *mtd)
for (i--; i >=0; i--) {
chip = &cfi->chips[i];
- spin_lock(chip->mutex);
+ mutex_lock(&chip->mutex);
if (chip->state == FL_PM_SUSPENDED) {
chip->state = chip->oldstate;
wake_up(&chip->wq);
}
- spin_unlock(chip->mutex);
+ mutex_unlock(&chip->mutex);
}
}
@@ -1921,7 +2511,7 @@ static void cfi_amdstd_resume(struct mtd_info *mtd)
chip = &cfi->chips[i];
- spin_lock(chip->mutex);
+ mutex_lock(&chip->mutex);
if (chip->state == FL_PM_SUSPENDED) {
chip->state = FL_READY;
@@ -1931,15 +2521,62 @@ static void cfi_amdstd_resume(struct mtd_info *mtd)
else
printk(KERN_ERR "Argh. Chip not in PM_SUSPENDED state upon resume()\n");
- spin_unlock(chip->mutex);
+ mutex_unlock(&chip->mutex);
}
}
+
+/*
+ * Ensure that the flash device is put back into read array mode before
+ * unloading the driver or rebooting. On some systems, rebooting while
+ * the flash is in query/program/erase mode will prevent the CPU from
+ * fetching the bootloader code, requiring a hard reset or power cycle.
+ */
+static int cfi_amdstd_reset(struct mtd_info *mtd)
+{
+ struct map_info *map = mtd->priv;
+ struct cfi_private *cfi = map->fldrv_priv;
+ int i, ret;
+ struct flchip *chip;
+
+ for (i = 0; i < cfi->numchips; i++) {
+
+ chip = &cfi->chips[i];
+
+ mutex_lock(&chip->mutex);
+
+ ret = get_chip(map, chip, chip->start, FL_SHUTDOWN);
+ if (!ret) {
+ map_write(map, CMD(0xF0), chip->start);
+ chip->state = FL_SHUTDOWN;
+ put_chip(map, chip, chip->start);
+ }
+
+ mutex_unlock(&chip->mutex);
+ }
+
+ return 0;
+}
+
+
+static int cfi_amdstd_reboot(struct notifier_block *nb, unsigned long val,
+ void *v)
+{
+ struct mtd_info *mtd;
+
+ mtd = container_of(nb, struct mtd_info, reboot_notifier);
+ cfi_amdstd_reset(mtd);
+ return NOTIFY_DONE;
+}
+
+
static void cfi_amdstd_destroy(struct mtd_info *mtd)
{
struct map_info *map = mtd->priv;
struct cfi_private *cfi = map->fldrv_priv;
+ cfi_amdstd_reset(mtd);
+ unregister_reboot_notifier(&mtd->reboot_notifier);
kfree(cfi->cmdset_priv);
kfree(cfi->cfiq);
kfree(cfi);
@@ -1949,3 +2586,5 @@ static void cfi_amdstd_destroy(struct mtd_info *mtd)
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Crossnet Co. <info@crossnet.co.jp> et al.");
MODULE_DESCRIPTION("MTD chip driver for AMD/Fujitsu flash chips");
+MODULE_ALIAS("cfi_cmdset_0006");
+MODULE_ALIAS("cfi_cmdset_0701");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-10 20:36:30 +0000