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linux_dsm_epyc7002/drivers/mtd/chips/cfi_cmdset_0002.c
Miquel Raynal 025a06c110 mtd: Convert fallthrough comments into statements 
Use Joe Perches cvt_fallthrough.pl script to convert

	/* fallthrough */

comments (and its derivatives) into a

	fallthrough;

statement. This automatically drops useless ones.

Do it MTD-wide.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Vignesh Raghavendra <vigneshr@ti.com>
Acked-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Acked-by: Richard Weinberger <richard@nod.at>
Link: https://lore.kernel.org/linux-mtd/20200325212115.14170-1-miquel.raynal@bootlin.com
2020-03-30 10:14:54 +02:00

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/*
* Common Flash Interface support:
* AMD & Fujitsu Standard Vendor Command Set (ID 0x0002)
*
* Copyright (C) 2000 Crossnet Co. <info@crossnet.co.jp>
* Copyright (C) 2004 Arcom Control Systems Ltd <linux@arcom.com>
* Copyright (C) 2005 MontaVista Software Inc. <source@mvista.com>
*
* 2_by_8 routines added by Simon Munton
*
* 4_by_16 work by Carolyn J. Smith
*
* XIP support hooks by Vitaly Wool (based on code for Intel flash
* by Nicolas Pitre)
*
* 25/09/2008 Christopher Moore: TopBottom fixup for many Macronix with CFI V1.0
*
* Occasionally maintained by Thayne Harbaugh tharbaugh at lnxi dot com
*
* This code is GPL
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <asm/io.h>
#include <asm/byteorder.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/interrupt.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>
#include <linux/mtd/xip.h>
#define AMD_BOOTLOC_BUG
#define FORCE_WORD_WRITE 0
#define MAX_RETRIES 3
#define SST49LF004B 0x0060
#define SST49LF040B 0x0050
#define SST49LF008A 0x005a
#define AT49BV6416 0x00d6
/*
* Status Register bit description. Used by flash devices that don't
* support DQ polling (e.g. HyperFlash)
*/
#define CFI_SR_DRB BIT(7)
#define CFI_SR_ESB BIT(5)
#define CFI_SR_PSB BIT(4)
#define CFI_SR_WBASB BIT(3)
#define CFI_SR_SLSB BIT(1)
static int cfi_amdstd_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
static int cfi_amdstd_write_words(struct mtd_info *, loff_t, size_t, size_t *, const u_char *);
#if !FORCE_WORD_WRITE
static int cfi_amdstd_write_buffers(struct mtd_info *, loff_t, size_t, size_t *, const u_char *);
#endif
static int cfi_amdstd_erase_chip(struct mtd_info *, struct erase_info *);
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_get_fact_prot_info(struct mtd_info *, size_t,
size_t *, struct otp_info *);
static int cfi_amdstd_get_user_prot_info(struct mtd_info *, size_t,
size_t *, struct otp_info *);
static int cfi_amdstd_secsi_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
static int cfi_amdstd_read_fact_prot_reg(struct mtd_info *, loff_t, size_t,
size_t *, u_char *);
static int cfi_amdstd_read_user_prot_reg(struct mtd_info *, loff_t, size_t,
size_t *, u_char *);
static int cfi_amdstd_write_user_prot_reg(struct mtd_info *, loff_t, size_t,
size_t *, u_char *);
static int cfi_amdstd_lock_user_prot_reg(struct mtd_info *, loff_t, size_t);
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);
static struct mtd_info *cfi_amdstd_setup (struct mtd_info *);
static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr, int mode);
static void put_chip(struct map_info *map, struct flchip *chip, unsigned long adr);
#include "fwh_lock.h"
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,
.name = "cfi_cmdset_0002",
.module = THIS_MODULE
};
/*
* Use status register to poll for Erase/write completion when DQ is not
* supported. This is indicated by Bit[1:0] of SoftwareFeatures field in
* CFI Primary Vendor-Specific Extended Query table 1.5
*/
static int cfi_use_status_reg(struct cfi_private *cfi)
{
struct cfi_pri_amdstd *extp = cfi->cmdset_priv;
u8 poll_mask = CFI_POLL_STATUS_REG | CFI_POLL_DQ;
return extp->MinorVersion >= '5' &&
(extp->SoftwareFeatures & poll_mask) == CFI_POLL_STATUS_REG;
}
static int cfi_check_err_status(struct map_info *map, struct flchip *chip,
unsigned long adr)
{
struct cfi_private *cfi = map->fldrv_priv;
map_word status;
if (!cfi_use_status_reg(cfi))
return 0;
cfi_send_gen_cmd(0x70, cfi->addr_unlock1, chip->start, map, cfi,
cfi->device_type, NULL);
status = map_read(map, adr);
/* The error bits are invalid while the chip's busy */
if (!map_word_bitsset(map, status, CMD(CFI_SR_DRB)))
return 0;
if (map_word_bitsset(map, status, CMD(0x3a))) {
unsigned long chipstatus = MERGESTATUS(status);
if (chipstatus & CFI_SR_ESB)
pr_err("%s erase operation failed, status %lx\n",
map->name, chipstatus);
if (chipstatus & CFI_SR_PSB)
pr_err("%s program operation failed, status %lx\n",
map->name, chipstatus);
if (chipstatus & CFI_SR_WBASB)
pr_err("%s buffer program command aborted, status %lx\n",
map->name, chipstatus);
if (chipstatus & CFI_SR_SLSB)
pr_err("%s sector write protected, status %lx\n",
map->name, chipstatus);
/* Erase/Program status bits are set on the operation failure */
if (chipstatus & (CFI_SR_ESB | CFI_SR_PSB))
return 1;
}
return 0;
}
/* #define DEBUG_CFI_FEATURES */
#ifdef DEBUG_CFI_FEATURES
static void cfi_tell_features(struct cfi_pri_amdstd *extp)
{
const char* erase_suspend[3] = {
"Not supported", "Read only", "Read/write"
};
const char* top_bottom[6] = {
"No WP", "8x8KiB sectors at top & bottom, no WP",
"Bottom boot", "Top boot",
"Uniform, Bottom WP", "Uniform, Top WP"
};
printk(" Silicon revision: %d\n", extp->SiliconRevision >> 1);
printk(" Address sensitive unlock: %s\n",
(extp->SiliconRevision & 1) ? "Not required" : "Required");
if (extp->EraseSuspend < ARRAY_SIZE(erase_suspend))
printk(" Erase Suspend: %s\n", erase_suspend[extp->EraseSuspend]);
else
printk(" Erase Suspend: Unknown value %d\n", extp->EraseSuspend);
if (extp->BlkProt == 0)
printk(" Block protection: Not supported\n");
else
printk(" Block protection: %d sectors per group\n", extp->BlkProt);
printk(" Temporary block unprotect: %s\n",
extp->TmpBlkUnprotect ? "Supported" : "Not supported");
printk(" Block protect/unprotect scheme: %d\n", extp->BlkProtUnprot);
printk(" Number of simultaneous operations: %d\n", extp->SimultaneousOps);
printk(" Burst mode: %s\n",
extp->BurstMode ? "Supported" : "Not supported");
if (extp->PageMode == 0)
printk(" Page mode: Not supported\n");
else
printk(" Page mode: %d word page\n", extp->PageMode << 2);
printk(" Vpp Supply Minimum Program/Erase Voltage: %d.%d V\n",
extp->VppMin >> 4, extp->VppMin & 0xf);
printk(" Vpp Supply Maximum Program/Erase Voltage: %d.%d V\n",
extp->VppMax >> 4, extp->VppMax & 0xf);
if (extp->TopBottom < ARRAY_SIZE(top_bottom))
printk(" Top/Bottom Boot Block: %s\n", top_bottom[extp->TopBottom]);
else
printk(" Top/Bottom Boot Block: Unknown value %d\n", extp->TopBottom);
}
#endif
#ifdef AMD_BOOTLOC_BUG
/* Wheee. Bring me the head of someone at AMD. */
static void fixup_amd_bootblock(struct mtd_info *mtd)
{
struct map_info *map = mtd->priv;
struct cfi_private *cfi = map->fldrv_priv;
struct cfi_pri_amdstd *extp = cfi->cmdset_priv;
__u8 major = extp->MajorVersion;
__u8 minor = extp->MinorVersion;
if (((major << 8) | minor) < 0x3131) {
/* CFI version 1.0 => don't trust bootloc */
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
* of 0x22BA in 16-bit mode and 0xBA in 8-bit mode.
* These were badly detected as they have the 0x80 bit set
* so treat them as a special case.
*/
if (((cfi->id == 0xBA) || (cfi->id == 0x22BA)) &&
/* Macronix added CFI to their 2nd generation
* MX29LV400C B/T but AFAICS no other 29LV400 (AMD,
* Fujitsu, Spansion, EON, ESI and older Macronix)
* has CFI.
*
* Therefore also check the manufacturer.
* This reduces the risk of false detection due to
* the 8-bit device ID.
*/
(cfi->mfr == CFI_MFR_MACRONIX)) {
pr_debug("%s: Macronix MX29LV400C with bottom boot block"
" detected\n", map->name);
extp->TopBottom = 2; /* bottom boot */
} else
if (cfi->id & 0x80) {
printk(KERN_WARNING "%s: JEDEC Device ID is 0x%02X. Assuming broken CFI table.\n", map->name, cfi->id);
extp->TopBottom = 3; /* top boot */
} else {
extp->TopBottom = 2; /* bottom boot */
}
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
#if !FORCE_WORD_WRITE
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) {
pr_debug("Using buffer write method\n");
mtd->_write = cfi_amdstd_write_buffers;
}
}
#endif /* !FORCE_WORD_WRITE */
/* Atmel chips don't use the same PRI format as AMD chips */
static void fixup_convert_atmel_pri(struct mtd_info *mtd)
{
struct map_info *map = mtd->priv;
struct cfi_private *cfi = map->fldrv_priv;
struct cfi_pri_amdstd *extp = cfi->cmdset_priv;
struct cfi_pri_atmel atmel_pri;
memcpy(&atmel_pri, extp, sizeof(atmel_pri));
memset((char *)extp + 5, 0, sizeof(*extp) - 5);
if (atmel_pri.Features & 0x02)
extp->EraseSuspend = 2;
/* Some chips got it backwards... */
if (cfi->id == AT49BV6416) {
if (atmel_pri.BottomBoot)
extp->TopBottom = 3;
else
extp->TopBottom = 2;
} else {
if (atmel_pri.BottomBoot)
extp->TopBottom = 2;
else
extp->TopBottom = 3;
}
/* burst write mode not supported */
cfi->cfiq->BufWriteTimeoutTyp = 0;
cfi->cfiq->BufWriteTimeoutMax = 0;
}
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;
}
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;
}
}
/*
* 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)
{
mtd->_lock = cfi_atmel_lock;
mtd->_unlock = cfi_atmel_unlock;
mtd->flags |= MTD_POWERUP_LOCK;
}
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_warn("%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_warn("%s: Bad S29GL064N CFI data; adjust from 64 to 128 sectors\n",
mtd->name);
}
}
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_warn("%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_warn("%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 },
#ifdef AMD_BOOTLOC_BUG
{ 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 },
{ 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 },
#endif
{ 0, 0, NULL }
};
static struct cfi_fixup jedec_fixup_table[] = {
{ 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[] = {
/* The CFI vendor ids and the JEDEC vendor IDs appear
* to be common. It is like the devices id's are as
* 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 },
{ 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) {
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)
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->_read_user_prot_reg = cfi_amdstd_read_user_prot_reg;
mtd->_read_fact_prot_reg = cfi_amdstd_read_fact_prot_reg;
mtd->_get_fact_prot_info = cfi_amdstd_get_fact_prot_info;
mtd->_get_user_prot_info = cfi_amdstd_get_user_prot_info;
mtd->_write_user_prot_reg = cfi_amdstd_write_user_prot_reg;
mtd->_lock_user_prot_reg = cfi_amdstd_lock_user_prot_reg;
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;
__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) {
/*
* It's a real CFI chip, not one for which the probe
* routine faked a CFI structure.
*/
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;
}
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;
/* 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);
#endif
#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
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;
swap(cfi->cfiq->EraseRegionInfo[i],
cfi->cfiq->EraseRegionInfo[j]);
}
}
/* 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;
}
} /* CFI mode */
else if (cfi->cfi_mode == CFI_MODE_JEDEC) {
/* Apply jedec specific fixups */
cfi_fixup(mtd, jedec_fixup_table);
}
/* Apply generic fixups */
cfi_fixup(mtd, fixup_table);
for (i=0; i< cfi->numchips; i++) {
cfi->chips[i].word_write_time = 1<<cfi->cfiq->WordWriteTimeoutTyp;
cfi->chips[i].buffer_write_time = 1<<cfi->cfiq->BufWriteTimeoutTyp;
cfi->chips[i].erase_time = 1<<cfi->cfiq->BlockEraseTimeoutTyp;
/*
* First calculate the timeout max according to timeout field
* of struct cfi_ident that probed from chip's CFI aera, if
* available. Specify a minimum of 2000us, in case the CFI data
* is wrong.
*/
if (cfi->cfiq->BufWriteTimeoutTyp &&
cfi->cfiq->BufWriteTimeoutMax)
cfi->chips[i].buffer_write_time_max =
1 << (cfi->cfiq->BufWriteTimeoutTyp +
cfi->cfiq->BufWriteTimeoutMax);
else
cfi->chips[i].buffer_write_time_max = 0;
cfi->chips[i].buffer_write_time_max =
max(cfi->chips[i].buffer_write_time_max, 2000);
cfi->chips[i].ref_point_counter = 0;
init_waitqueue_head(&(cfi->chips[i].wq));
}
map->fldrv = &cfi_amdstd_chipdrv;
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)
{
struct map_info *map = mtd->priv;
struct cfi_private *cfi = map->fldrv_priv;
unsigned long devsize = (1<<cfi->cfiq->DevSize) * cfi->interleave;
unsigned long offset = 0;
int i,j;
printk(KERN_NOTICE "number of %s chips: %d\n",
(cfi->cfi_mode == CFI_MODE_CFI)?"CFI":"JEDEC",cfi->numchips);
/* Select the correct geometry setup */
mtd->size = devsize * cfi->numchips;
mtd->numeraseregions = cfi->cfiq->NumEraseRegions * cfi->numchips;
mtd->eraseregions = kmalloc_array(mtd->numeraseregions,
sizeof(struct mtd_erase_region_info),
GFP_KERNEL);
if (!mtd->eraseregions)
goto setup_err;
for (i=0; i<cfi->cfiq->NumEraseRegions; i++) {
unsigned long ernum, ersize;
ersize = ((cfi->cfiq->EraseRegionInfo[i] >> 8) & ~0xff) * cfi->interleave;
ernum = (cfi->cfiq->EraseRegionInfo[i] & 0xffff) + 1;
if (mtd->erasesize < ersize) {
mtd->erasesize = ersize;
}
for (j=0; j<cfi->numchips; j++) {
mtd->eraseregions[(j*cfi->cfiq->NumEraseRegions)+i].offset = (j*devsize)+offset;
mtd->eraseregions[(j*cfi->cfiq->NumEraseRegions)+i].erasesize = ersize;
mtd->eraseregions[(j*cfi->cfiq->NumEraseRegions)+i].numblocks = ernum;
}
offset += (ersize * ernum);
}
if (offset != devsize) {
/* Argh */
printk(KERN_WARNING "Sum of regions (%lx) != total size of set of interleaved chips (%lx)\n", offset, devsize);
goto setup_err;
}
__module_get(THIS_MODULE);
register_reboot_notifier(&mtd->reboot_notifier);
return mtd;
setup_err:
kfree(mtd->eraseregions);
kfree(mtd);
kfree(cfi->cmdset_priv);
return NULL;
}
/*
* Return true if the chip is ready.
*
* Ready is one of: read mode, query mode, erase-suspend-read mode (in any
* non-suspended sector) and is indicated by no toggle bits toggling.
*
* 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 (particularly with interleaved chips
* as each chip must be checked independently of the others).
*/
static int __xipram chip_ready(struct map_info *map, struct flchip *chip,
unsigned long addr)
{
struct cfi_private *cfi = map->fldrv_priv;
map_word d, t;
if (cfi_use_status_reg(cfi)) {
map_word ready = CMD(CFI_SR_DRB);
/*
* For chips that support status register, check device
* ready bit
*/
cfi_send_gen_cmd(0x70, cfi->addr_unlock1, chip->start, map, cfi,
cfi->device_type, NULL);
d = map_read(map, addr);
return map_word_andequal(map, d, ready, ready);
}
d = map_read(map, addr);
t = map_read(map, addr);
return map_word_equal(map, d, t);
}
/*
* Return true if the chip is ready and has the correct value.
*
* Ready is one of: read mode, query mode, erase-suspend-read mode (in any
* non-suspended sector) and it is indicated by no bits toggling.
*
* Error are indicated by toggling bits or bits held with the wrong value,
* or with bits toggling.
*
* 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 (particularly with interleaved chips
* as each chip must be checked independently of the others).
*
*/
static int __xipram chip_good(struct map_info *map, struct flchip *chip,
unsigned long addr, map_word expected)
{
struct cfi_private *cfi = map->fldrv_priv;
map_word oldd, curd;
if (cfi_use_status_reg(cfi)) {
map_word ready = CMD(CFI_SR_DRB);
/*
* For chips that support status register, check device
* ready bit
*/
cfi_send_gen_cmd(0x70, cfi->addr_unlock1, chip->start, map, cfi,
cfi->device_type, NULL);
curd = map_read(map, addr);
return map_word_andequal(map, curd, ready, ready);
}
oldd = map_read(map, addr);
curd = map_read(map, addr);
return map_word_equal(map, oldd, curd) &&
map_word_equal(map, curd, expected);
}
static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr, int mode)
{
DECLARE_WAITQUEUE(wait, current);
struct cfi_private *cfi = map->fldrv_priv;
unsigned long timeo;
struct cfi_pri_amdstd *cfip = (struct cfi_pri_amdstd *)cfi->cmdset_priv;
resettime:
timeo = jiffies + HZ;
retry:
switch (chip->state) {
case FL_STATUS:
for (;;) {
if (chip_ready(map, chip, adr))
break;
if (time_after(jiffies, timeo)) {
printk(KERN_ERR "Waiting for chip to be ready timed out.\n");
return -EIO;
}
mutex_unlock(&chip->mutex);
cfi_udelay(1);
mutex_lock(&chip->mutex);
/* Someone else might have been playing with it. */
goto retry;
}
case FL_READY:
case FL_CFI_QUERY:
case FL_JEDEC_QUERY:
return 0;
case FL_ERASING:
if (!cfip || !(cfip->EraseSuspend & (0x1|0x2)) ||
!(mode == FL_READY || mode == FL_POINT ||
(mode == FL_WRITING && (cfip->EraseSuspend & 0x2))))
goto sleep;
/* Do not allow suspend iff read/write to EB address */
if ((adr & chip->in_progress_block_mask) ==
chip->in_progress_block_addr)
goto sleep;
/* Erase suspend */
/* It's harmless to issue the Erase-Suspend and Erase-Resume
* commands when the erase algorithm isn't in progress. */
map_write(map, CMD(0xB0), chip->in_progress_block_addr);
chip->oldstate = FL_ERASING;
chip->state = FL_ERASE_SUSPENDING;
chip->erase_suspended = 1;
for (;;) {
if (chip_ready(map, chip, adr))
break;
if (time_after(jiffies, timeo)) {
/* Should have suspended the erase by now.
* Send an Erase-Resume command as either
* there was an error (so leave the erase
* routine to recover from it) or we trying to
* use the erase-in-progress sector. */
put_chip(map, chip, adr);
printk(KERN_ERR "MTD %s(): chip not ready after erase suspend\n", __func__);
return -EIO;
}
mutex_unlock(&chip->mutex);
cfi_udelay(1);
mutex_lock(&chip->mutex);
/* Nobody will touch it while it's in state FL_ERASE_SUSPENDING.
So we can just loop here. */
}
chip->state = FL_READY;
return 0;
case FL_XIP_WHILE_ERASING:
if (mode != FL_READY && mode != FL_POINT &&
(!cfip || !(cfip->EraseSuspend&2)))
goto sleep;
chip->oldstate = chip->state;
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)
return 0;
fallthrough;
default:
sleep:
set_current_state(TASK_UNINTERRUPTIBLE);
add_wait_queue(&chip->wq, &wait);
mutex_unlock(&chip->mutex);
schedule();
remove_wait_queue(&chip->wq, &wait);
mutex_lock(&chip->mutex);
goto resettime;
}
}
static void put_chip(struct map_info *map, struct flchip *chip, unsigned long adr)
{
struct cfi_private *cfi = map->fldrv_priv;
switch(chip->oldstate) {
case FL_ERASING:
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;
case FL_XIP_WHILE_ERASING:
chip->state = chip->oldstate;
chip->oldstate = FL_READY;
break;
case FL_READY:
case FL_STATUS:
break;
default:
printk(KERN_ERR "MTD: put_chip() called with oldstate %d!!\n", chip->oldstate);
}
wake_up(&chip->wq);
}
#ifdef CONFIG_MTD_XIP
/*
* No interrupt what so ever can be serviced while the flash isn't in array
* mode. This is ensured by the xip_disable() and xip_enable() functions
* enclosing any code path where the flash is known not to be in array mode.
* And within a XIP disabled code path, only functions marked with __xipram
* may be called and nothing else (it's a good thing to inspect generated
* assembly to make sure inline functions were actually inlined and that gcc
* didn't emit calls to its own support functions). Also configuring MTD CFI
* support to a single buswidth and a single interleave is also recommended.
*/
static void xip_disable(struct map_info *map, struct flchip *chip,
unsigned long adr)
{
/* TODO: chips with no XIP use should ignore and return */
(void) map_read(map, adr); /* ensure mmu mapping is up to date */
local_irq_disable();
}
static void __xipram xip_enable(struct map_info *map, struct flchip *chip,
unsigned long adr)
{
struct cfi_private *cfi = map->fldrv_priv;
if (chip->state != FL_POINT && chip->state != FL_READY) {
map_write(map, CMD(0xf0), adr);
chip->state = FL_READY;
}
(void) map_read(map, adr);
xip_iprefetch();
local_irq_enable();
}
/*
* When a delay is required for the flash operation to complete, the
* xip_udelay() function is polling for both the given timeout and pending
* (but still masked) hardware interrupts. Whenever there is an interrupt
* pending then the flash erase operation is suspended, array mode restored
* and interrupts unmasked. Task scheduling might also happen at that
* point. The CPU eventually returns from the interrupt or the call to
* schedule() and the suspended flash operation is resumed for the remaining
* of the delay period.
*
* Warning: this function _will_ fool interrupt latency tracing tools.
*/
static void __xipram xip_udelay(struct map_info *map, struct flchip *chip,
unsigned long adr, int usec)
{
struct cfi_private *cfi = map->fldrv_priv;
struct cfi_pri_amdstd *extp = cfi->cmdset_priv;
map_word status, OK = CMD(0x80);
unsigned long suspended, start = xip_currtime();
flstate_t oldstate;
do {
cpu_relax();
if (xip_irqpending() && extp &&
((chip->state == FL_ERASING && (extp->EraseSuspend & 2))) &&
(cfi_interleave_is_1(cfi) || chip->oldstate == FL_READY)) {
/*
* Let's suspend the erase operation when supported.
* Note that we currently don't try to suspend
* interleaved chips if there is already another
* operation suspended (imagine what happens
* when one chip was already done with the current
* operation while another chip suspended it, then
* we resume the whole thing at once). Yes, it
* can happen!
*/
map_write(map, CMD(0xb0), adr);
usec -= xip_elapsed_since(start);
suspended = xip_currtime();
do {
if (xip_elapsed_since(suspended) > 100000) {
/*
* The chip doesn't want to suspend
* after waiting for 100 msecs.
* This is a critical error but there
* is not much we can do here.
*/
return;
}
status = map_read(map, adr);
} while (!map_word_andequal(map, status, OK, OK));
/* Suspend succeeded */
oldstate = chip->state;
if (!map_word_bitsset(map, status, CMD(0x40)))
break;
chip->state = FL_XIP_WHILE_ERASING;
chip->erase_suspended = 1;
map_write(map, CMD(0xf0), adr);
(void) map_read(map, adr);
xip_iprefetch();
local_irq_enable();
mutex_unlock(&chip->mutex);
xip_iprefetch();
cond_resched();
/*
* We're back. However someone else might have
* decided to go write to the chip if we are in
* a suspended erase state. If so let's wait
* until it's done.
*/
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);
mutex_unlock(&chip->mutex);
schedule();
remove_wait_queue(&chip->wq, &wait);
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, cfi->sector_erase_cmd, adr);
chip->state = oldstate;
start = xip_currtime();
} else if (usec >= 1000000/HZ) {
/*
* Try to save on CPU power when waiting delay
* is at least a system timer tick period.
* No need to be extremely accurate here.
*/
xip_cpu_idle();
}
status = map_read(map, adr);
} while (!map_word_andequal(map, status, OK, OK)
&& xip_elapsed_since(start) < usec);
}
#define UDELAY(map, chip, adr, usec) xip_udelay(map, chip, adr, usec)
/*
* The INVALIDATE_CACHED_RANGE() macro is normally used in parallel while
* the flash is actively programming or erasing since we have to poll for
* the operation to complete anyway. We can't do that in a generic way with
* a XIP setup so do it before the actual flash operation in this case
* and stub it out from INVALIDATE_CACHE_UDELAY.
*/
#define XIP_INVAL_CACHED_RANGE(map, from, size) \
INVALIDATE_CACHED_RANGE(map, from, size)
#define INVALIDATE_CACHE_UDELAY(map, chip, adr, len, usec) \
UDELAY(map, chip, adr, usec)
/*
* Extra notes:
*
* Activating this XIP support changes the way the code works a bit. For
* example the code to suspend the current process when concurrent access
* happens is never executed because xip_udelay() will always return with the
* same chip state as it was entered with. This is why there is no care for
* the presence of add_wait_queue() or schedule() calls from within a couple
* xip_disable()'d areas of code, like in do_erase_oneblock for example.
* The queueing and scheduling are always happening within xip_udelay().
*
* Similarly, get_chip() and put_chip() just happen to always be executed
* with chip->state set to FL_READY (or FL_XIP_WHILE_*) where flash state
* is in array mode, therefore never executing many cases therein and not
* causing any problem with XIP.
*/
#else
#define xip_disable(map, chip, adr)
#define xip_enable(map, chip, adr)
#define XIP_INVAL_CACHED_RANGE(x...)
#define UDELAY(map, chip, adr, usec) \
do { \
mutex_unlock(&chip->mutex); \
cfi_udelay(usec); \
mutex_lock(&chip->mutex); \
} while (0)
#define INVALIDATE_CACHE_UDELAY(map, chip, adr, len, usec) \
do { \
mutex_unlock(&chip->mutex); \
INVALIDATE_CACHED_RANGE(map, adr, len); \
cfi_udelay(usec); \
mutex_lock(&chip->mutex); \
} while (0)
#endif
static inline int do_read_onechip(struct map_info *map, struct flchip *chip, loff_t adr, size_t len, u_char *buf)
{
unsigned long cmd_addr;
struct cfi_private *cfi = map->fldrv_priv;
int ret;
adr += chip->start;
/* Ensure cmd read/writes are aligned. */
cmd_addr = adr & ~(map_bankwidth(map)-1);
mutex_lock(&chip->mutex);
ret = get_chip(map, chip, cmd_addr, FL_READY);
if (ret) {
mutex_unlock(&chip->mutex);
return ret;
}
if (chip->state != FL_POINT && chip->state != FL_READY) {
map_write(map, CMD(0xf0), cmd_addr);
chip->state = FL_READY;
}
map_copy_from(map, buf, adr, len);
put_chip(map, chip, cmd_addr);
mutex_unlock(&chip->mutex);
return 0;
}
static int cfi_amdstd_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
{
struct map_info *map = mtd->priv;
struct cfi_private *cfi = map->fldrv_priv;
unsigned long ofs;
int chipnum;
int ret = 0;
/* ofs: offset within the first chip that the first read should start */
chipnum = (from >> cfi->chipshift);
ofs = from - (chipnum << cfi->chipshift);
while (len) {
unsigned long thislen;
if (chipnum >= cfi->numchips)
break;
if ((len + ofs -1) >> cfi->chipshift)
thislen = (1<<cfi->chipshift) - ofs;
else
thislen = len;
ret = do_read_onechip(map, &cfi->chips[chipnum], ofs, thislen, buf);
if (ret)
break;
*retlen += thislen;
len -= thislen;
buf += thislen;
ofs = 0;
chipnum++;
}
return ret;
}
typedef int (*otp_op_t)(struct map_info *map, struct flchip *chip,
loff_t adr, size_t len, u_char *buf, size_t grouplen);
static inline void otp_enter(struct map_info *map, struct flchip *chip,
loff_t adr, size_t len)
{
struct cfi_private *cfi = map->fldrv_priv;
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(0x88, cfi->addr_unlock1, chip->start, map, cfi,
cfi->device_type, NULL);
INVALIDATE_CACHED_RANGE(map, chip->start + adr, len);
}
static inline void otp_exit(struct map_info *map, struct flchip *chip,
loff_t adr, size_t len)
{
struct cfi_private *cfi = map->fldrv_priv;
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(0x90, cfi->addr_unlock1, chip->start, map, cfi,
cfi->device_type, NULL);
cfi_send_gen_cmd(0x00, cfi->addr_unlock1, chip->start, map, cfi,
cfi->device_type, NULL);
INVALIDATE_CACHED_RANGE(map, chip->start + adr, len);
}
static inline int do_read_secsi_onechip(struct map_info *map,
struct flchip *chip, loff_t adr,
size_t len, u_char *buf,
size_t grouplen)
{
DECLARE_WAITQUEUE(wait, current);
retry:
mutex_lock(&chip->mutex);
if (chip->state != FL_READY){
set_current_state(TASK_UNINTERRUPTIBLE);
add_wait_queue(&chip->wq, &wait);
mutex_unlock(&chip->mutex);
schedule();
remove_wait_queue(&chip->wq, &wait);
goto retry;
}
adr += chip->start;
chip->state = FL_READY;
otp_enter(map, chip, adr, len);
map_copy_from(map, buf, adr, len);
otp_exit(map, chip, adr, len);
wake_up(&chip->wq);
mutex_unlock(&chip->mutex);
return 0;
}
static int cfi_amdstd_secsi_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
{
struct map_info *map = mtd->priv;
struct cfi_private *cfi = map->fldrv_priv;
unsigned long ofs;
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;
while (len) {
unsigned long thislen;
if (chipnum >= cfi->numchips)
break;
if ((len + ofs -1) >> 3)
thislen = (1<<3) - ofs;
else
thislen = len;
ret = do_read_secsi_onechip(map, &cfi->chips[chipnum], ofs,
thislen, buf, 0);
if (ret)
break;
*retlen += thislen;
len -= thislen;
buf += thislen;
ofs = 0;
chipnum++;
}
return ret;
}
static int __xipram do_write_oneword(struct map_info *map, struct flchip *chip,
unsigned long adr, map_word datum,
int mode);
static int do_otp_write(struct map_info *map, struct flchip *chip, loff_t adr,
size_t len, u_char *buf, size_t grouplen)
{
int ret;
while (len) {
unsigned long bus_ofs = adr & ~(map_bankwidth(map)-1);
int gap = adr - bus_ofs;
int n = min_t(int, len, map_bankwidth(map) - gap);
map_word datum = map_word_ff(map);
if (n != map_bankwidth(map)) {
/* partial write of a word, load old contents */
otp_enter(map, chip, bus_ofs, map_bankwidth(map));
datum = map_read(map, bus_ofs);
otp_exit(map, chip, bus_ofs, map_bankwidth(map));
}
datum = map_word_load_partial(map, datum, buf, gap, n);
ret = do_write_oneword(map, chip, bus_ofs, datum, FL_OTP_WRITE);
if (ret)
return ret;
adr += n;
buf += n;
len -= n;
}
return 0;
}
static int do_otp_lock(struct map_info *map, struct flchip *chip, loff_t adr,
size_t len, u_char *buf, size_t grouplen)
{
struct cfi_private *cfi = map->fldrv_priv;
uint8_t lockreg;
unsigned long timeo;
int ret;
/* make sure area matches group boundaries */
if ((adr != 0) || (len != grouplen))
return -EINVAL;
mutex_lock(&chip->mutex);
ret = get_chip(map, chip, chip->start, FL_LOCKING);
if (ret) {
mutex_unlock(&chip->mutex);
return ret;
}
chip->state = FL_LOCKING;
/* Enter lock register command */
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(0x40, cfi->addr_unlock1, chip->start, map, cfi,
cfi->device_type, NULL);
/* read lock register */
lockreg = cfi_read_query(map, 0);
/* set bit 0 to protect extended memory block */
lockreg &= ~0x01;
/* set bit 0 to protect extended memory block */
/* write lock register */
map_write(map, CMD(0xA0), chip->start);
map_write(map, CMD(lockreg), chip->start);
/* wait for chip to become ready */
timeo = jiffies + msecs_to_jiffies(2);
for (;;) {
if (chip_ready(map, chip, adr))
break;
if (time_after(jiffies, timeo)) {
pr_err("Waiting for chip to be ready timed out.\n");
ret = -EIO;
break;
}
UDELAY(map, chip, 0, 1);
}
/* exit protection commands */
map_write(map, CMD(0x90), chip->start);
map_write(map, CMD(0x00), chip->start);
chip->state = FL_READY;
put_chip(map, chip, chip->start);
mutex_unlock(&chip->mutex);
return ret;
}
static int cfi_amdstd_otp_walk(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char *buf,
otp_op_t action, int user_regs)
{
struct map_info *map = mtd->priv;
struct cfi_private *cfi = map->fldrv_priv;
int ofs_factor = cfi->interleave * cfi->device_type;
unsigned long base;
int chipnum;
struct flchip *chip;
uint8_t otp, lockreg;
int ret;
size_t user_size, factory_size, otpsize;
loff_t user_offset, factory_offset, otpoffset;
int user_locked = 0, otplocked;
*retlen = 0;
for (chipnum = 0; chipnum < cfi->numchips; chipnum++) {
chip = &cfi->chips[chipnum];
factory_size = 0;
user_size = 0;
/* Micron M29EW family */
if (is_m29ew(cfi)) {
base = chip->start;
/* check whether secsi area is factory locked
or user lockable */
mutex_lock(&chip->mutex);
ret = get_chip(map, chip, base, FL_CFI_QUERY);
if (ret) {
mutex_unlock(&chip->mutex);
return ret;
}
cfi_qry_mode_on(base, map, cfi);
otp = cfi_read_query(map, base + 0x3 * ofs_factor);
cfi_qry_mode_off(base, map, cfi);
put_chip(map, chip, base);
mutex_unlock(&chip->mutex);
if (otp & 0x80) {
/* factory locked */
factory_offset = 0;
factory_size = 0x100;
} else {
/* customer lockable */
user_offset = 0;
user_size = 0x100;
mutex_lock(&chip->mutex);
ret = get_chip(map, chip, base, FL_LOCKING);
if (ret) {
mutex_unlock(&chip->mutex);
return ret;
}
/* Enter lock register command */
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(0x40, cfi->addr_unlock1,
chip->start, map, cfi,
cfi->device_type, NULL);
/* read lock register */
lockreg = cfi_read_query(map, 0);
/* exit protection commands */
map_write(map, CMD(0x90), chip->start);
map_write(map, CMD(0x00), chip->start);
put_chip(map, chip, chip->start);
mutex_unlock(&chip->mutex);
user_locked = ((lockreg & 0x01) == 0x00);
}
}
otpsize = user_regs ? user_size : factory_size;
if (!otpsize)
continue;
otpoffset = user_regs ? user_offset : factory_offset;
otplocked = user_regs ? user_locked : 1;
if (!action) {
/* return otpinfo */
struct otp_info *otpinfo;
len -= sizeof(*otpinfo);
if (len <= 0)
return -ENOSPC;
otpinfo = (struct otp_info *)buf;
otpinfo->start = from;
otpinfo->length = otpsize;
otpinfo->locked = otplocked;
buf += sizeof(*otpinfo);
*retlen += sizeof(*otpinfo);
from += otpsize;
} else if ((from < otpsize) && (len > 0)) {
size_t size;
size = (len < otpsize - from) ? len : otpsize - from;
ret = action(map, chip, otpoffset + from, size, buf,
otpsize);
if (ret < 0)
return ret;
buf += size;
len -= size;
*retlen += size;
from = 0;
} else {
from -= otpsize;
}
}
return 0;
}
static int cfi_amdstd_get_fact_prot_info(struct mtd_info *mtd, size_t len,
size_t *retlen, struct otp_info *buf)
{
return cfi_amdstd_otp_walk(mtd, 0, len, retlen, (u_char *)buf,
NULL, 0);
}
static int cfi_amdstd_get_user_prot_info(struct mtd_info *mtd, size_t len,
size_t *retlen, struct otp_info *buf)
{
return cfi_amdstd_otp_walk(mtd, 0, len, retlen, (u_char *)buf,
NULL, 1);
}
static int cfi_amdstd_read_fact_prot_reg(struct mtd_info *mtd, loff_t from,
size_t len, size_t *retlen,
u_char *buf)
{
return cfi_amdstd_otp_walk(mtd, from, len, retlen,
buf, do_read_secsi_onechip, 0);
}
static int cfi_amdstd_read_user_prot_reg(struct mtd_info *mtd, loff_t from,
size_t len, size_t *retlen,
u_char *buf)
{
return cfi_amdstd_otp_walk(mtd, from, len, retlen,
buf, do_read_secsi_onechip, 1);
}
static int cfi_amdstd_write_user_prot_reg(struct mtd_info *mtd, loff_t from,
size_t len, size_t *retlen,
u_char *buf)
{
return cfi_amdstd_otp_walk(mtd, from, len, retlen, buf,
do_otp_write, 1);
}
static int cfi_amdstd_lock_user_prot_reg(struct mtd_info *mtd, loff_t from,
size_t len)
{
size_t retlen;
return cfi_amdstd_otp_walk(mtd, from, len, &retlen, NULL,
do_otp_lock, 1);
}
static int __xipram do_write_oneword_once(struct map_info *map,
struct flchip *chip,
unsigned long adr, map_word datum,
int mode, struct cfi_private *cfi)
{
unsigned long timeo = jiffies + HZ;
/*
* We use a 1ms + 1 jiffies generic timeout for writes (most devices
* have a max write time of a few hundreds usec). However, we should
* use the maximum timeout value given by the chip at probe time
* instead. Unfortunately, struct flchip does have a field for
* maximum timeout, only for typical which can be far too short
* depending of the conditions. The ' + 1' is to avoid having a
* timeout of 0 jiffies if HZ is smaller than 1000.
*/
unsigned long uWriteTimeout = (HZ / 1000) + 1;
int ret = 0;
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);
chip->state = mode;
INVALIDATE_CACHE_UDELAY(map, chip,
adr, map_bankwidth(map),
chip->word_write_time);
/* See comment above for timeout value. */
timeo = jiffies + uWriteTimeout;
for (;;) {
if (chip->state != mode) {
/* Someone's suspended the write. Sleep */
DECLARE_WAITQUEUE(wait, current);
set_current_state(TASK_UNINTERRUPTIBLE);
add_wait_queue(&chip->wq, &wait);
mutex_unlock(&chip->mutex);
schedule();
remove_wait_queue(&chip->wq, &wait);
timeo = jiffies + (HZ / 2); /* FIXME */
mutex_lock(&chip->mutex);
continue;
}
/*
* We check "time_after" and "!chip_good" before checking
* "chip_good" to avoid the failure due to scheduling.
*/
if (time_after(jiffies, timeo) &&
!chip_good(map, chip, adr, datum)) {
xip_enable(map, chip, adr);
printk(KERN_WARNING "MTD %s(): software timeout\n", __func__);
xip_disable(map, chip, adr);
ret = -EIO;
break;
}
if (chip_good(map, chip, adr, datum)) {
if (cfi_check_err_status(map, chip, adr))
ret = -EIO;
break;
}
/* Latency issues. Drop the lock, wait a while and retry */
UDELAY(map, chip, adr, 1);
}
return ret;
}
static int __xipram do_write_oneword_start(struct map_info *map,
struct flchip *chip,
unsigned long adr, int mode)
{
int ret;
mutex_lock(&chip->mutex);
ret = get_chip(map, chip, adr, mode);
if (ret) {
mutex_unlock(&chip->mutex);
return ret;
}
if (mode == FL_OTP_WRITE)
otp_enter(map, chip, adr, map_bankwidth(map));
return ret;
}
static void __xipram do_write_oneword_done(struct map_info *map,
struct flchip *chip,
unsigned long adr, int mode)
{
if (mode == FL_OTP_WRITE)
otp_exit(map, chip, adr, map_bankwidth(map));
chip->state = FL_READY;
DISABLE_VPP(map);
put_chip(map, chip, adr);
mutex_unlock(&chip->mutex);
}
static int __xipram do_write_oneword_retry(struct map_info *map,
struct flchip *chip,
unsigned long adr, map_word datum,
int mode)
{
struct cfi_private *cfi = map->fldrv_priv;
int ret = 0;
map_word oldd;
int retry_cnt = 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__);
return ret;
}
XIP_INVAL_CACHED_RANGE(map, adr, map_bankwidth(map));
ENABLE_VPP(map);
xip_disable(map, chip, adr);
retry:
ret = do_write_oneword_once(map, chip, adr, datum, mode, cfi);
if (ret) {
/* reset on all failures. */
map_write(map, CMD(0xF0), chip->start);
/* FIXME - should have reset delay before continuing */
if (++retry_cnt <= MAX_RETRIES) {
ret = 0;
goto retry;
}
}
xip_enable(map, chip, adr);
return ret;
}
static int __xipram do_write_oneword(struct map_info *map, struct flchip *chip,
unsigned long adr, map_word datum,
int mode)
{
int ret;
adr += chip->start;
pr_debug("MTD %s(): WRITE 0x%.8lx(0x%.8lx)\n", __func__, adr,
datum.x[0]);
ret = do_write_oneword_start(map, chip, adr, mode);
if (ret)
return ret;
ret = do_write_oneword_retry(map, chip, adr, datum, mode);
do_write_oneword_done(map, chip, adr, mode);
return ret;
}
static int cfi_amdstd_write_words(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;
int ret;
int chipnum;
unsigned long ofs, chipstart;
DECLARE_WAITQUEUE(wait, current);
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;
retry:
mutex_lock(&cfi->chips[chipnum].mutex);
if (cfi->chips[chipnum].state != FL_READY) {
set_current_state(TASK_UNINTERRUPTIBLE);
add_wait_queue(&cfi->chips[chipnum].wq, &wait);
mutex_unlock(&cfi->chips[chipnum].mutex);
schedule();
remove_wait_queue(&cfi->chips[chipnum].wq, &wait);
goto retry;
}
/* Load 'tmp_buf' with old contents of flash */
tmp_buf = map_read(map, bus_ofs+chipstart);
mutex_unlock(&cfi->chips[chipnum].mutex);
/* 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_write_oneword(map, &cfi->chips[chipnum],
bus_ofs, tmp_buf, FL_WRITING);
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_write_oneword(map, &cfi->chips[chipnum],
ofs, datum, FL_WRITING);
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;
retry1:
mutex_lock(&cfi->chips[chipnum].mutex);
if (cfi->chips[chipnum].state != FL_READY) {
set_current_state(TASK_UNINTERRUPTIBLE);
add_wait_queue(&cfi->chips[chipnum].wq, &wait);
mutex_unlock(&cfi->chips[chipnum].mutex);
schedule();
remove_wait_queue(&cfi->chips[chipnum].wq, &wait);
goto retry1;
}
tmp_buf = map_read(map, ofs + chipstart);
mutex_unlock(&cfi->chips[chipnum].mutex);
tmp_buf = map_word_load_partial(map, tmp_buf, buf, 0, len);
ret = do_write_oneword(map, &cfi->chips[chipnum],
ofs, tmp_buf, FL_WRITING);
if (ret)
return ret;
(*retlen) += len;
}
return 0;
}
#if !FORCE_WORD_WRITE
static int __xipram do_write_buffer_wait(struct map_info *map,
struct flchip *chip, unsigned long adr,
map_word datum)
{
unsigned long timeo;
unsigned long u_write_timeout;
int ret = 0;
/*
* Timeout is calculated according to CFI data, if available.
* See more comments in cfi_cmdset_0002().
*/
u_write_timeout = usecs_to_jiffies(chip->buffer_write_time_max);
timeo = jiffies + u_write_timeout;
for (;;) {
if (chip->state != FL_WRITING) {
/* Someone's suspended the write. Sleep */
DECLARE_WAITQUEUE(wait, current);
set_current_state(TASK_UNINTERRUPTIBLE);
add_wait_queue(&chip->wq, &wait);
mutex_unlock(&chip->mutex);
schedule();
remove_wait_queue(&chip->wq, &wait);
timeo = jiffies + (HZ / 2); /* FIXME */
mutex_lock(&chip->mutex);
continue;
}
/*
* We check "time_after" and "!chip_good" before checking
* "chip_good" to avoid the failure due to scheduling.
*/
if (time_after(jiffies, timeo) &&
!chip_good(map, chip, adr, datum)) {
pr_err("MTD %s(): software timeout, address:0x%.8lx.\n",
__func__, adr);
ret = -EIO;
break;
}
if (chip_good(map, chip, adr, datum)) {
if (cfi_check_err_status(map, chip, adr))
ret = -EIO;
break;
}
/* Latency issues. Drop the lock, wait a while and retry */
UDELAY(map, chip, adr, 1);
}
return ret;
}
static void __xipram do_write_buffer_reset(struct map_info *map,
struct flchip *chip,
struct cfi_private *cfi)
{
/*
* 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);
/* FIXME - should have reset delay before continuing */
}
/*
* FIXME: interleaved mode not tested, and probably not supported!
*/
static int __xipram do_write_buffer(struct map_info *map, struct flchip *chip,
unsigned long adr, const u_char *buf,
int len)
{
struct cfi_private *cfi = map->fldrv_priv;
int ret;
unsigned long cmd_adr;
int z, words;
map_word datum;
adr += chip->start;
cmd_adr = adr;
mutex_lock(&chip->mutex);
ret = get_chip(map, chip, adr, FL_WRITING);
if (ret) {
mutex_unlock(&chip->mutex);
return ret;
}
datum = map_word_load(map, buf);
pr_debug("MTD %s(): WRITE 0x%.8lx(0x%.8lx)\n",
__func__, adr, datum.x[0]);
XIP_INVAL_CACHED_RANGE(map, adr, len);
ENABLE_VPP(map);
xip_disable(map, chip, cmd_adr);
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);
/* Write Buffer Load */
map_write(map, CMD(0x25), cmd_adr);
chip->state = FL_WRITING_TO_BUFFER;
/* Write length of data to come */
words = len / map_bankwidth(map);
map_write(map, CMD(words - 1), cmd_adr);
/* Write data */
z = 0;
while(z < words * map_bankwidth(map)) {
datum = map_word_load(map, buf);
map_write(map, datum, adr + z);
z += map_bankwidth(map);
buf += map_bankwidth(map);
}
z -= map_bankwidth(map);
adr += z;
/* Write Buffer Program Confirm: GO GO GO */
map_write(map, CMD(0x29), cmd_adr);
chip->state = FL_WRITING;
INVALIDATE_CACHE_UDELAY(map, chip,
adr, map_bankwidth(map),
chip->word_write_time);
ret = do_write_buffer_wait(map, chip, adr, datum);
if (ret)
do_write_buffer_reset(map, chip, cfi);
xip_enable(map, chip, adr);
chip->state = FL_READY;
DISABLE_VPP(map);
put_chip(map, chip, adr);
mutex_unlock(&chip->mutex);
return ret;
}
static int cfi_amdstd_write_buffers(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;
int wbufsize = cfi_interleave(cfi) << cfi->cfiq->MaxBufWriteSize;
int ret;
int chipnum;
unsigned long ofs;
chipnum = to >> cfi->chipshift;
ofs = to - (chipnum << cfi->chipshift);
/* If it's not bus-aligned, do the first word write */
if (ofs & (map_bankwidth(map)-1)) {
size_t local_len = (-ofs)&(map_bankwidth(map)-1);
if (local_len > len)
local_len = len;
ret = cfi_amdstd_write_words(mtd, ofs + (chipnum<<cfi->chipshift),
local_len, retlen, buf);
if (ret)
return ret;
ofs += local_len;
buf += local_len;
len -= local_len;
if (ofs >> cfi->chipshift) {
chipnum ++;
ofs = 0;
if (chipnum == cfi->numchips)
return 0;
}
}
/* Write buffer is worth it only if more than one word to write... */
while (len >= map_bankwidth(map) * 2) {
/* We must not cross write block boundaries */
int size = wbufsize - (ofs & (wbufsize-1));
if (size > len)
size = len;
if (size % map_bankwidth(map))
size -= size % map_bankwidth(map);
ret = do_write_buffer(map, &cfi->chips[chipnum],
ofs, buf, size);
if (ret)
return ret;
ofs += size;
buf += size;
(*retlen) += size;
len -= size;
if (ofs >> cfi->chipshift) {
chipnum ++;
ofs = 0;
if (chipnum == cfi->numchips)
return 0;
}
}
if (len) {
size_t retlen_dregs = 0;
ret = cfi_amdstd_write_words(mtd, ofs + (chipnum<<cfi->chipshift),
len, &retlen_dregs, buf);
*retlen += retlen_dregs;
return ret;
}
return 0;
}
#endif /* !FORCE_WORD_WRITE */
/*
* 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, chip, 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, chip, adr))
return 0;
udelay(1);
}
retries--;
}
/* 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;
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, chip, adr))
break;
udelay(1);
}
if (!chip_good(map, chip, adr, datum) ||
cfi_check_err_status(map, chip, adr)) {
/* reset on all failures. */
map_write(map, CMD(0xF0), chip->start);
/* FIXME - should have reset delay before continuing */
if (++retry_cnt <= MAX_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;
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
* the chip erase command.
*/
static int __xipram do_erase_chip(struct map_info *map, struct flchip *chip)
{
struct cfi_private *cfi = map->fldrv_priv;
unsigned long timeo = jiffies + HZ;
unsigned long int adr;
DECLARE_WAITQUEUE(wait, current);
int ret;
int retry_cnt = 0;
adr = cfi->addr_unlock1;
mutex_lock(&chip->mutex);
ret = get_chip(map, chip, adr, FL_ERASING);
if (ret) {
mutex_unlock(&chip->mutex);
return ret;
}
pr_debug("MTD %s(): ERASE 0x%.8lx\n",
__func__, chip->start);
XIP_INVAL_CACHED_RANGE(map, adr, map->size);
ENABLE_VPP(map);
xip_disable(map, chip, adr);
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(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);
cfi_send_gen_cmd(0x10, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL);
chip->state = FL_ERASING;
chip->erase_suspended = 0;
chip->in_progress_block_addr = adr;
chip->in_progress_block_mask = ~(map->size - 1);
INVALIDATE_CACHE_UDELAY(map, chip,
adr, map->size,
chip->erase_time*500);
timeo = jiffies + (HZ*20);
for (;;) {
if (chip->state != FL_ERASING) {
/* Someone's suspended the erase. Sleep */
set_current_state(TASK_UNINTERRUPTIBLE);
add_wait_queue(&chip->wq, &wait);
mutex_unlock(&chip->mutex);
schedule();
remove_wait_queue(&chip->wq, &wait);
mutex_lock(&chip->mutex);
continue;
}
if (chip->erase_suspended) {
/* This erase was suspended and resumed.
Adjust the timeout */
timeo = jiffies + (HZ*20); /* FIXME */
chip->erase_suspended = 0;
}
if (chip_good(map, chip, adr, map_word_ff(map))) {
if (cfi_check_err_status(map, chip, adr))
ret = -EIO;
break;
}
if (time_after(jiffies, timeo)) {
printk(KERN_WARNING "MTD %s(): software timeout\n",
__func__);
ret = -EIO;
break;
}
/* Latency issues. Drop the lock, wait a while and retry */
UDELAY(map, chip, adr, 1000000/HZ);
}
/* Did we succeed? */
if (ret) {
/* reset on all failures. */
map_write(map, CMD(0xF0), chip->start);
/* FIXME - should have reset delay before continuing */
if (++retry_cnt <= MAX_RETRIES) {
ret = 0;
goto retry;
}
}
chip->state = FL_READY;
xip_enable(map, chip, adr);
DISABLE_VPP(map);
put_chip(map, chip, adr);
mutex_unlock(&chip->mutex);
return ret;
}
static int __xipram do_erase_oneblock(struct map_info *map, struct flchip *chip, unsigned long adr, int len, void *thunk)
{
struct cfi_private *cfi = map->fldrv_priv;
unsigned long timeo = jiffies + HZ;
DECLARE_WAITQUEUE(wait, current);
int ret;
int retry_cnt = 0;
adr += chip->start;
mutex_lock(&chip->mutex);
ret = get_chip(map, chip, adr, FL_ERASING);
if (ret) {
mutex_unlock(&chip->mutex);
return ret;
}
pr_debug("MTD %s(): ERASE 0x%.8lx\n",
__func__, adr);
XIP_INVAL_CACHED_RANGE(map, adr, len);
ENABLE_VPP(map);
xip_disable(map, chip, adr);
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(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, cfi->sector_erase_cmd, adr);
chip->state = FL_ERASING;
chip->erase_suspended = 0;
chip->in_progress_block_addr = adr;
chip->in_progress_block_mask = ~(len - 1);
INVALIDATE_CACHE_UDELAY(map, chip,
adr, len,
chip->erase_time*500);
timeo = jiffies + (HZ*20);
for (;;) {
if (chip->state != FL_ERASING) {
/* Someone's suspended the erase. Sleep */
set_current_state(TASK_UNINTERRUPTIBLE);
add_wait_queue(&chip->wq, &wait);
mutex_unlock(&chip->mutex);
schedule();
remove_wait_queue(&chip->wq, &wait);
mutex_lock(&chip->mutex);
continue;
}
if (chip->erase_suspended) {
/* This erase was suspended and resumed.
Adjust the timeout */
timeo = jiffies + (HZ*20); /* FIXME */
chip->erase_suspended = 0;
}
if (chip_good(map, chip, adr, map_word_ff(map))) {
if (cfi_check_err_status(map, chip, adr))
ret = -EIO;
break;
}
if (time_after(jiffies, timeo)) {
printk(KERN_WARNING "MTD %s(): software timeout\n",
__func__);
ret = -EIO;
break;
}
/* Latency issues. Drop the lock, wait a while and retry */
UDELAY(map, chip, adr, 1000000/HZ);
}
/* Did we succeed? */
if (ret) {
/* reset on all failures. */
map_write(map, CMD(0xF0), chip->start);
/* FIXME - should have reset delay before continuing */
if (++retry_cnt <= MAX_RETRIES) {
ret = 0;
goto retry;
}
}
chip->state = FL_READY;
xip_enable(map, chip, adr);
DISABLE_VPP(map);
put_chip(map, chip, adr);
mutex_unlock(&chip->mutex);
return ret;
}
static int cfi_amdstd_erase_varsize(struct mtd_info *mtd, struct erase_info *instr)
{
return cfi_varsize_frob(mtd, do_erase_oneblock, instr->addr,
instr->len, NULL);
}
static int cfi_amdstd_erase_chip(struct mtd_info *mtd, struct erase_info *instr)
{
struct map_info *map = mtd->priv;
struct cfi_private *cfi = map->fldrv_priv;
if (instr->addr != 0)
return -EINVAL;
if (instr->len != mtd->size)
return -EINVAL;
return do_erase_chip(map, &cfi->chips[0]);
}
static int do_atmel_lock(struct map_info *map, struct flchip *chip,
unsigned long adr, int len, void *thunk)
{
struct cfi_private *cfi = map->fldrv_priv;
int ret;
mutex_lock(&chip->mutex);
ret = get_chip(map, chip, adr + chip->start, FL_LOCKING);
if (ret)
goto out_unlock;
chip->state = FL_LOCKING;
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);
cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi,
cfi->device_type, NULL);
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(0x40), chip->start + adr);
chip->state = FL_READY;
put_chip(map, chip, adr + chip->start);
ret = 0;
out_unlock:
mutex_unlock(&chip->mutex);
return ret;
}
static int do_atmel_unlock(struct map_info *map, struct flchip *chip,
unsigned long adr, int len, void *thunk)
{
struct cfi_private *cfi = map->fldrv_priv;
int ret;
mutex_lock(&chip->mutex);
ret = get_chip(map, chip, adr + chip->start, FL_UNLOCKING);
if (ret)
goto out_unlock;
chip->state = FL_UNLOCKING;
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);
map_write(map, CMD(0x70), adr);
chip->state = FL_READY;
put_chip(map, chip, adr + chip->start);
ret = 0;
out_unlock:
mutex_unlock(&chip->mutex);
return ret;
}
static int cfi_atmel_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
return cfi_varsize_frob(mtd, do_atmel_lock, ofs, len, NULL);
}
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;
unsigned long adr;
int locked;
};
#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;
adr += chip->start;
mutex_lock(&chip->mutex);
ret = get_chip(map, chip, adr, 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), adr);
map_write(map, CMD(0x00), 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, chip, 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);
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;
int max_sectors;
/*
* 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.
*/
max_sectors = 0;
for (i = 0; i < mtd->numeraseregions; i++)
max_sectors += regions[i].numblocks;
sect = kcalloc(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 ((offset < ofs) || (offset >= (ofs + len))) {
sect[sectors].chip = &cfi->chips[chipnum];
sect[sectors].adr = adr;
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) {
if (offset >= (ofs + len))
break;
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].adr, 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)
{
struct map_info *map = mtd->priv;
struct cfi_private *cfi = map->fldrv_priv;
int i;
struct flchip *chip;
int ret = 0;
DECLARE_WAITQUEUE(wait, current);
for (i=0; !ret && i<cfi->numchips; i++) {
chip = &cfi->chips[i];
retry:
mutex_lock(&chip->mutex);
switch(chip->state) {
case FL_READY:
case FL_STATUS:
case FL_CFI_QUERY:
case FL_JEDEC_QUERY:
chip->oldstate = chip->state;
chip->state = FL_SYNCING;
/* No need to wake_up() on this state change -
* as the whole point is that nobody can do anything
* with the chip now anyway.
*/
fallthrough;
case FL_SYNCING:
mutex_unlock(&chip->mutex);
break;
default:
/* Not an idle state */
set_current_state(TASK_UNINTERRUPTIBLE);
add_wait_queue(&chip->wq, &wait);
mutex_unlock(&chip->mutex);
schedule();
remove_wait_queue(&chip->wq, &wait);
goto retry;
}
}
/* Unlock the chips again */
for (i--; i >=0; i--) {
chip = &cfi->chips[i];
mutex_lock(&chip->mutex);
if (chip->state == FL_SYNCING) {
chip->state = chip->oldstate;
wake_up(&chip->wq);
}
mutex_unlock(&chip->mutex);
}
}
static int cfi_amdstd_suspend(struct mtd_info *mtd)
{
struct map_info *map = mtd->priv;
struct cfi_private *cfi = map->fldrv_priv;
int i;
struct flchip *chip;
int ret = 0;
for (i=0; !ret && i<cfi->numchips; i++) {
chip = &cfi->chips[i];
mutex_lock(&chip->mutex);
switch(chip->state) {
case FL_READY:
case FL_STATUS:
case FL_CFI_QUERY:
case FL_JEDEC_QUERY:
chip->oldstate = chip->state;
chip->state = FL_PM_SUSPENDED;
/* No need to wake_up() on this state change -
* as the whole point is that nobody can do anything
* with the chip now anyway.
*/
case FL_PM_SUSPENDED:
break;
default:
ret = -EAGAIN;
break;
}
mutex_unlock(&chip->mutex);
}
/* Unlock the chips again */
if (ret) {
for (i--; i >=0; i--) {
chip = &cfi->chips[i];
mutex_lock(&chip->mutex);
if (chip->state == FL_PM_SUSPENDED) {
chip->state = chip->oldstate;
wake_up(&chip->wq);
}
mutex_unlock(&chip->mutex);
}
}
return ret;
}
static void cfi_amdstd_resume(struct mtd_info *mtd)
{
struct map_info *map = mtd->priv;
struct cfi_private *cfi = map->fldrv_priv;
int i;
struct flchip *chip;
for (i=0; i<cfi->numchips; i++) {
chip = &cfi->chips[i];
mutex_lock(&chip->mutex);
if (chip->state == FL_PM_SUSPENDED) {
chip->state = FL_READY;
map_write(map, CMD(0xF0), chip->start);
wake_up(&chip->wq);
}
else
printk(KERN_ERR "Argh. Chip not in PM_SUSPENDED state upon resume()\n");
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);
kfree(mtd->eraseregions);
}
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");
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