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cfi_cmdset_0002.c
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cfi_cmdset_0002.c
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/*
* Common Flash Interface support:
* AMD & Fujitsu Standard Vendor Command Set (ID 0x0002)
*
* Copyright (C) 2000 Crossnet Co. <[email protected]>
* Copyright (C) 2004 Arcom Control Systems Ltd <[email protected]>
* Copyright (C) 2005 MontaVista Software Inc. <[email protected]>
*
* 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 <linux/init.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/mtd/compatmac.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_WORD_RETRIES 3
#define SST49LF004B 0x0060
#define SST49LF040B 0x0050
#define SST49LF008A 0x005a
#define AT49BV6416 0x00d6
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 *);
static int cfi_amdstd_write_buffers(struct mtd_info *, loff_t, size_t, size_t *, const u_char *);
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_secsi_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
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 struct mtd_chip_driver cfi_amdstd_chipdrv = {
.probe = NULL, /* Not usable directly */
.destroy = cfi_amdstd_destroy,
.name = "cfi_cmdset_0002",
.module = THIS_MODULE
};
/* #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, void* param)
{
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 */
DEBUG(MTD_DEBUG_LEVEL1,
"%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)) {
DEBUG(MTD_DEBUG_LEVEL1,
"%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 */
}
DEBUG(MTD_DEBUG_LEVEL1,
"%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)
{
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;
}
}
/* Atmel chips don't use the same PRI format as AMD chips */
static void fixup_convert_atmel_pri(struct mtd_info *mtd, void *param)
{
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, void *param)
{
/* 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, void *param)
{
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, void *param)
{
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 seperate 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, void *param)
{
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, void *param)
{
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;
}
static void fixup_s29gl064n_sectors(struct mtd_info *mtd, void *param)
{
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);
}
}
static void fixup_s29gl032n_sectors(struct mtd_info *mtd, void *param)
{
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);
}
}
/* 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, NULL, }, // SST39VF1602
{ CFI_MFR_SST, 0x234B, fixup_sst39vf, NULL, }, // SST39VF1601
{ CFI_MFR_SST, 0x235A, fixup_sst39vf, NULL, }, // SST39VF3202
{ CFI_MFR_SST, 0x235B, fixup_sst39vf, NULL, }, // SST39VF3201
{ CFI_MFR_SST, 0x235C, fixup_sst39vf_rev_b, NULL, }, // SST39VF3202B
{ CFI_MFR_SST, 0x235D, fixup_sst39vf_rev_b, NULL, }, // SST39VF3201B
{ CFI_MFR_SST, 0x236C, fixup_sst39vf_rev_b, NULL, }, // SST39VF6402B
{ CFI_MFR_SST, 0x236D, fixup_sst39vf_rev_b, NULL, }, // SST39VF6401B
{ 0, 0, NULL, NULL }
};
static struct cfi_fixup cfi_fixup_table[] = {
{ CFI_MFR_ATMEL, CFI_ID_ANY, fixup_convert_atmel_pri, NULL },
#ifdef AMD_BOOTLOC_BUG
{ CFI_MFR_AMD, CFI_ID_ANY, fixup_amd_bootblock, NULL },
{ CFI_MFR_MACRONIX, CFI_ID_ANY, fixup_amd_bootblock, NULL },
#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, },
#if !FORCE_WORD_WRITE
{ CFI_MFR_ANY, CFI_ID_ANY, fixup_use_write_buffers, NULL, },
#endif
{ 0, 0, NULL, NULL }
};
static struct cfi_fixup jedec_fixup_table[] = {
{ CFI_MFR_SST, SST49LF004B, fixup_use_fwh_lock, NULL, },
{ CFI_MFR_SST, SST49LF040B, fixup_use_fwh_lock, NULL, },
{ CFI_MFR_SST, SST49LF008A, fixup_use_fwh_lock, NULL, },
{ 0, 0, NULL, 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, NULL },
{ CFI_MFR_ATMEL, AT49BV6416, fixup_use_atmel_lock, NULL },
{ 0, 0, NULL, 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')
extp->MajorVersion = '1';
}
struct mtd_info *cfi_cmdset_0002(struct map_info *map, int primary)
{
struct cfi_private *cfi = map->fldrv_priv;
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");
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->flags = MTD_CAP_NORFLASH;
mtd->name = map->name;
mtd->writesize = 1;
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);
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;
}
/* 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
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;
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;
}
} /* 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;
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(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");
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;
}
#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
__module_get(THIS_MODULE);
register_reboot_notifier(&mtd->reboot_notifier);
return mtd;
setup_err:
kfree(mtd->eraseregions);
kfree(mtd);
kfree(cfi->cmdset_priv);
kfree(cfi->cfiq);
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 (particulary with interleaved chips
* as each chip must be checked independantly of the others).
*/
static int __xipram chip_ready(struct map_info *map, unsigned long addr)
{
map_word d, t;
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 (particulary with interleaved chips
* as each chip must be checked independantly of the others).
*
*/
static int __xipram chip_good(struct map_info *map, unsigned long addr, map_word expected)
{
map_word oldd, curd;
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, 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;
/* We could check to see if we're trying to access the sector
* that is currently being erased. However, no user will try
* anything like that so we just wait for the timeout. */
/* 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, 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. */
map_write(map, CMD(0x30), chip->in_progress_block_addr);
chip->state = FL_ERASING;
chip->oldstate = FL_READY;
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;
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:
chip->state = chip->oldstate;
map_write(map, CMD(0x30), chip->in_progress_block_addr);
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:
/* 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);
}
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();
/* Resume the write or erase operation */
map_write(map, CMD(0x30), 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);
*retlen = 0;
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;