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cfi_cmdset_0001.c
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/*
* Common Flash Interface support:
* Intel Extended Vendor Command Set (ID 0x0001)
*
* (C) 2000 Red Hat. GPL'd
*
*
* 10/10/2000 Nicolas Pitre <[email protected]>
* - completely revamped method functions so they are aware and
* independent of the flash geometry (buswidth, interleave, etc.)
* - scalability vs code size is completely set at compile-time
* (see include/linux/mtd/cfi.h for selection)
* - optimized write buffer method
* 02/05/2002 Christopher Hoover <[email protected]>/<[email protected]>
* - reworked lock/unlock/erase support for var size flash
* 21/03/2007 Rodolfo Giometti <[email protected]>
* - auto unlock sectors on resume for auto locking flash on power up
*/
#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/bitmap.h>
#include <linux/mtd/xip.h>
#include <linux/mtd/map.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/compatmac.h>
#include <linux/mtd/cfi.h>
/* #define CMDSET0001_DISABLE_ERASE_SUSPEND_ON_WRITE */
/* #define CMDSET0001_DISABLE_WRITE_SUSPEND */
// debugging, turns off buffer write mode if set to 1
#define FORCE_WORD_WRITE 0
#define MANUFACTURER_INTEL 0x0089
#define I82802AB 0x00ad
#define I82802AC 0x00ac
#define MANUFACTURER_ST 0x0020
#define M50LPW080 0x002F
#define M50FLW080A 0x0080
#define M50FLW080B 0x0081
#define AT49BV640D 0x02de
static int cfi_intelext_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
static int cfi_intelext_write_words(struct mtd_info *, loff_t, size_t, size_t *, const u_char *);
static int cfi_intelext_write_buffers(struct mtd_info *, loff_t, size_t, size_t *, const u_char *);
static int cfi_intelext_writev(struct mtd_info *, const struct kvec *, unsigned long, loff_t, size_t *);
static int cfi_intelext_erase_varsize(struct mtd_info *, struct erase_info *);
static void cfi_intelext_sync (struct mtd_info *);
static int cfi_intelext_lock(struct mtd_info *mtd, loff_t ofs, size_t len);
static int cfi_intelext_unlock(struct mtd_info *mtd, loff_t ofs, size_t len);
#ifdef CONFIG_MTD_OTP
static int cfi_intelext_read_fact_prot_reg (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
static int cfi_intelext_read_user_prot_reg (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
static int cfi_intelext_write_user_prot_reg (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
static int cfi_intelext_lock_user_prot_reg (struct mtd_info *, loff_t, size_t);
static int cfi_intelext_get_fact_prot_info (struct mtd_info *,
struct otp_info *, size_t);
static int cfi_intelext_get_user_prot_info (struct mtd_info *,
struct otp_info *, size_t);
#endif
static int cfi_intelext_suspend (struct mtd_info *);
static void cfi_intelext_resume (struct mtd_info *);
static int cfi_intelext_reboot (struct notifier_block *, unsigned long, void *);
static void cfi_intelext_destroy(struct mtd_info *);
struct mtd_info *cfi_cmdset_0001(struct map_info *, int);
static struct mtd_info *cfi_intelext_setup (struct mtd_info *);
static int cfi_intelext_partition_fixup(struct mtd_info *, struct cfi_private **);
static int cfi_intelext_point (struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, void **virt, resource_size_t *phys);
static void cfi_intelext_unpoint(struct mtd_info *mtd, loff_t from, size_t len);
static int chip_ready (struct map_info *map, struct flchip *chip, unsigned long adr, int mode);
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"
/*
* *********** SETUP AND PROBE BITS ***********
*/
static struct mtd_chip_driver cfi_intelext_chipdrv = {
.probe = NULL, /* Not usable directly */
.destroy = cfi_intelext_destroy,
.name = "cfi_cmdset_0001",
.module = THIS_MODULE
};
/* #define DEBUG_LOCK_BITS */
/* #define DEBUG_CFI_FEATURES */
#ifdef DEBUG_CFI_FEATURES
static void cfi_tell_features(struct cfi_pri_intelext *extp)
{
int i;
printk(" Extended Query version %c.%c\n", extp->MajorVersion, extp->MinorVersion);
printk(" Feature/Command Support: %4.4X\n", extp->FeatureSupport);
printk(" - Chip Erase: %s\n", extp->FeatureSupport&1?"supported":"unsupported");
printk(" - Suspend Erase: %s\n", extp->FeatureSupport&2?"supported":"unsupported");
printk(" - Suspend Program: %s\n", extp->FeatureSupport&4?"supported":"unsupported");
printk(" - Legacy Lock/Unlock: %s\n", extp->FeatureSupport&8?"supported":"unsupported");
printk(" - Queued Erase: %s\n", extp->FeatureSupport&16?"supported":"unsupported");
printk(" - Instant block lock: %s\n", extp->FeatureSupport&32?"supported":"unsupported");
printk(" - Protection Bits: %s\n", extp->FeatureSupport&64?"supported":"unsupported");
printk(" - Page-mode read: %s\n", extp->FeatureSupport&128?"supported":"unsupported");
printk(" - Synchronous read: %s\n", extp->FeatureSupport&256?"supported":"unsupported");
printk(" - Simultaneous operations: %s\n", extp->FeatureSupport&512?"supported":"unsupported");
printk(" - Extended Flash Array: %s\n", extp->FeatureSupport&1024?"supported":"unsupported");
for (i=11; i<32; i++) {
if (extp->FeatureSupport & (1<<i))
printk(" - Unknown Bit %X: supported\n", i);
}
printk(" Supported functions after Suspend: %2.2X\n", extp->SuspendCmdSupport);
printk(" - Program after Erase Suspend: %s\n", extp->SuspendCmdSupport&1?"supported":"unsupported");
for (i=1; i<8; i++) {
if (extp->SuspendCmdSupport & (1<<i))
printk(" - Unknown Bit %X: supported\n", i);
}
printk(" Block Status Register Mask: %4.4X\n", extp->BlkStatusRegMask);
printk(" - Lock Bit Active: %s\n", extp->BlkStatusRegMask&1?"yes":"no");
printk(" - Lock-Down Bit Active: %s\n", extp->BlkStatusRegMask&2?"yes":"no");
for (i=2; i<3; i++) {
if (extp->BlkStatusRegMask & (1<<i))
printk(" - Unknown Bit %X Active: yes\n",i);
}
printk(" - EFA Lock Bit: %s\n", extp->BlkStatusRegMask&16?"yes":"no");
printk(" - EFA Lock-Down Bit: %s\n", extp->BlkStatusRegMask&32?"yes":"no");
for (i=6; i<16; i++) {
if (extp->BlkStatusRegMask & (1<<i))
printk(" - Unknown Bit %X Active: yes\n",i);
}
printk(" Vcc Logic Supply Optimum Program/Erase Voltage: %d.%d V\n",
extp->VccOptimal >> 4, extp->VccOptimal & 0xf);
if (extp->VppOptimal)
printk(" Vpp Programming Supply Optimum Program/Erase Voltage: %d.%d V\n",
extp->VppOptimal >> 4, extp->VppOptimal & 0xf);
}
#endif
/* Atmel chips don't use the same PRI format as Intel 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_intelext *extp = cfi->cmdset_priv;
struct cfi_pri_atmel atmel_pri;
uint32_t features = 0;
/* Reverse byteswapping */
extp->FeatureSupport = cpu_to_le32(extp->FeatureSupport);
extp->BlkStatusRegMask = cpu_to_le16(extp->BlkStatusRegMask);
extp->ProtRegAddr = cpu_to_le16(extp->ProtRegAddr);
memcpy(&atmel_pri, extp, sizeof(atmel_pri));
memset((char *)extp + 5, 0, sizeof(*extp) - 5);
printk(KERN_ERR "atmel Features: %02x\n", atmel_pri.Features);
if (atmel_pri.Features & 0x01) /* chip erase supported */
features |= (1<<0);
if (atmel_pri.Features & 0x02) /* erase suspend supported */
features |= (1<<1);
if (atmel_pri.Features & 0x04) /* program suspend supported */
features |= (1<<2);
if (atmel_pri.Features & 0x08) /* simultaneous operations supported */
features |= (1<<9);
if (atmel_pri.Features & 0x20) /* page mode read supported */
features |= (1<<7);
if (atmel_pri.Features & 0x40) /* queued erase supported */
features |= (1<<4);
if (atmel_pri.Features & 0x80) /* Protection bits supported */
features |= (1<<6);
extp->FeatureSupport = features;
/* burst write mode not supported */
cfi->cfiq->BufWriteTimeoutTyp = 0;
cfi->cfiq->BufWriteTimeoutMax = 0;
}
#ifdef CMDSET0001_DISABLE_ERASE_SUSPEND_ON_WRITE
/* Some Intel Strata Flash prior to FPO revision C has bugs in this area */
static void fixup_intel_strataflash(struct mtd_info *mtd, void* param)
{
struct map_info *map = mtd->priv;
struct cfi_private *cfi = map->fldrv_priv;
struct cfi_pri_intelext *extp = cfi->cmdset_priv;
printk(KERN_WARNING "cfi_cmdset_0001: Suspend "
"erase on write disabled.\n");
extp->SuspendCmdSupport &= ~1;
}
#endif
#ifdef CMDSET0001_DISABLE_WRITE_SUSPEND
static void fixup_no_write_suspend(struct mtd_info *mtd, void* param)
{
struct map_info *map = mtd->priv;
struct cfi_private *cfi = map->fldrv_priv;
struct cfi_pri_intelext *cfip = cfi->cmdset_priv;
if (cfip && (cfip->FeatureSupport&4)) {
cfip->FeatureSupport &= ~4;
printk(KERN_WARNING "cfi_cmdset_0001: write suspend disabled\n");
}
}
#endif
static void fixup_st_m28w320ct(struct mtd_info *mtd, void* param)
{
struct map_info *map = mtd->priv;
struct cfi_private *cfi = map->fldrv_priv;
cfi->cfiq->BufWriteTimeoutTyp = 0; /* Not supported */
cfi->cfiq->BufWriteTimeoutMax = 0; /* Not supported */
}
static void fixup_st_m28w320cb(struct mtd_info *mtd, void* param)
{
struct map_info *map = mtd->priv;
struct cfi_private *cfi = map->fldrv_priv;
/* Note this is done after the region info is endian swapped */
cfi->cfiq->EraseRegionInfo[1] =
(cfi->cfiq->EraseRegionInfo[1] & 0xffff0000) | 0x3e;
};
static void fixup_use_point(struct mtd_info *mtd, void *param)
{
struct map_info *map = mtd->priv;
if (!mtd->point && map_is_linear(map)) {
mtd->point = cfi_intelext_point;
mtd->unpoint = cfi_intelext_unpoint;
}
}
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) {
printk(KERN_INFO "Using buffer write method\n" );
mtd->write = cfi_intelext_write_buffers;
mtd->writev = cfi_intelext_writev;
}
}
/*
* Some chips power-up with all sectors locked by default.
*/
static void fixup_unlock_powerup_lock(struct mtd_info *mtd, void *param)
{
struct map_info *map = mtd->priv;
struct cfi_private *cfi = map->fldrv_priv;
struct cfi_pri_intelext *cfip = cfi->cmdset_priv;
if (cfip->FeatureSupport&32) {
printk(KERN_INFO "Using auto-unlock on power-up/resume\n" );
mtd->flags |= MTD_POWERUP_LOCK;
}
}
static struct cfi_fixup cfi_fixup_table[] = {
{ CFI_MFR_ATMEL, CFI_ID_ANY, fixup_convert_atmel_pri, NULL },
#ifdef CMDSET0001_DISABLE_ERASE_SUSPEND_ON_WRITE
{ CFI_MFR_ANY, CFI_ID_ANY, fixup_intel_strataflash, NULL },
#endif
#ifdef CMDSET0001_DISABLE_WRITE_SUSPEND
{ CFI_MFR_ANY, CFI_ID_ANY, fixup_no_write_suspend, NULL },
#endif
#if !FORCE_WORD_WRITE
{ CFI_MFR_ANY, CFI_ID_ANY, fixup_use_write_buffers, NULL },
#endif
{ CFI_MFR_ST, 0x00ba, /* M28W320CT */ fixup_st_m28w320ct, NULL },
{ CFI_MFR_ST, 0x00bb, /* M28W320CB */ fixup_st_m28w320cb, NULL },
{ MANUFACTURER_INTEL, CFI_ID_ANY, fixup_unlock_powerup_lock, NULL, },
{ 0, 0, NULL, NULL }
};
static struct cfi_fixup jedec_fixup_table[] = {
{ MANUFACTURER_INTEL, I82802AB, fixup_use_fwh_lock, NULL, },
{ MANUFACTURER_INTEL, I82802AC, fixup_use_fwh_lock, NULL, },
{ MANUFACTURER_ST, M50LPW080, fixup_use_fwh_lock, NULL, },
{ MANUFACTURER_ST, M50FLW080A, fixup_use_fwh_lock, NULL, },
{ MANUFACTURER_ST, M50FLW080B, 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_point, NULL },
{ 0, 0, NULL, NULL }
};
static inline struct cfi_pri_intelext *
read_pri_intelext(struct map_info *map, __u16 adr)
{
struct cfi_pri_intelext *extp;
unsigned int extp_size = sizeof(*extp);
again:
extp = (struct cfi_pri_intelext *)cfi_read_pri(map, adr, extp_size, "Intel/Sharp");
if (!extp)
return NULL;
if (extp->MajorVersion != '1' ||
(extp->MinorVersion < '0' || extp->MinorVersion > '5')) {
printk(KERN_ERR " Unknown Intel/Sharp Extended Query "
"version %c.%c.\n", extp->MajorVersion,
extp->MinorVersion);
kfree(extp);
return NULL;
}
/* Do some byteswapping if necessary */
extp->FeatureSupport = le32_to_cpu(extp->FeatureSupport);
extp->BlkStatusRegMask = le16_to_cpu(extp->BlkStatusRegMask);
extp->ProtRegAddr = le16_to_cpu(extp->ProtRegAddr);
if (extp->MajorVersion == '1' && extp->MinorVersion >= '3') {
unsigned int extra_size = 0;
int nb_parts, i;
/* Protection Register info */
extra_size += (extp->NumProtectionFields - 1) *
sizeof(struct cfi_intelext_otpinfo);
/* Burst Read info */
extra_size += 2;
if (extp_size < sizeof(*extp) + extra_size)
goto need_more;
extra_size += extp->extra[extra_size-1];
/* Number of hardware-partitions */
extra_size += 1;
if (extp_size < sizeof(*extp) + extra_size)
goto need_more;
nb_parts = extp->extra[extra_size - 1];
/* skip the sizeof(partregion) field in CFI 1.4 */
if (extp->MinorVersion >= '4')
extra_size += 2;
for (i = 0; i < nb_parts; i++) {
struct cfi_intelext_regioninfo *rinfo;
rinfo = (struct cfi_intelext_regioninfo *)&extp->extra[extra_size];
extra_size += sizeof(*rinfo);
if (extp_size < sizeof(*extp) + extra_size)
goto need_more;
rinfo->NumIdentPartitions=le16_to_cpu(rinfo->NumIdentPartitions);
extra_size += (rinfo->NumBlockTypes - 1)
* sizeof(struct cfi_intelext_blockinfo);
}
if (extp->MinorVersion >= '4')
extra_size += sizeof(struct cfi_intelext_programming_regioninfo);
if (extp_size < sizeof(*extp) + extra_size) {
need_more:
extp_size = sizeof(*extp) + extra_size;
kfree(extp);
if (extp_size > 4096) {
printk(KERN_ERR
"%s: cfi_pri_intelext is too fat\n",
__func__);
return NULL;
}
goto again;
}
}
return extp;
}
struct mtd_info *cfi_cmdset_0001(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_ERR "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_intelext_erase_varsize;
mtd->read = cfi_intelext_read;
mtd->write = cfi_intelext_write_words;
mtd->sync = cfi_intelext_sync;
mtd->lock = cfi_intelext_lock;
mtd->unlock = cfi_intelext_unlock;
mtd->suspend = cfi_intelext_suspend;
mtd->resume = cfi_intelext_resume;
mtd->flags = MTD_CAP_NORFLASH;
mtd->name = map->name;
mtd->writesize = 1;
mtd->reboot_notifier.notifier_call = cfi_intelext_reboot;
if (cfi->cfi_mode == CFI_MODE_CFI) {
/*
* It's a real CFI chip, not one for which the probe
* routine faked a CFI structure. So we read the feature
* table from it.
*/
__u16 adr = primary?cfi->cfiq->P_ADR:cfi->cfiq->A_ADR;
struct cfi_pri_intelext *extp;
extp = read_pri_intelext(map, adr);
if (!extp) {
kfree(mtd);
return NULL;
}
/* Install our own private info structure */
cfi->cmdset_priv = extp;
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
if(extp->SuspendCmdSupport & 1) {
printk(KERN_NOTICE "cfi_cmdset_0001: Erase suspend on write enabled\n");
}
}
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++) {
if (cfi->cfiq->WordWriteTimeoutTyp)
cfi->chips[i].word_write_time =
1<<cfi->cfiq->WordWriteTimeoutTyp;
else
cfi->chips[i].word_write_time = 50000;
if (cfi->cfiq->BufWriteTimeoutTyp)
cfi->chips[i].buffer_write_time =
1<<cfi->cfiq->BufWriteTimeoutTyp;
/* No default; if it isn't specified, we won't use it */
if (cfi->cfiq->BlockEraseTimeoutTyp)
cfi->chips[i].erase_time =
1000<<cfi->cfiq->BlockEraseTimeoutTyp;
else
cfi->chips[i].erase_time = 2000000;
cfi->chips[i].ref_point_counter = 0;
init_waitqueue_head(&(cfi->chips[i].wq));
}
map->fldrv = &cfi_intelext_chipdrv;
return cfi_intelext_setup(mtd);
}
struct mtd_info *cfi_cmdset_0003(struct map_info *map, int primary) __attribute__((alias("cfi_cmdset_0001")));
struct mtd_info *cfi_cmdset_0200(struct map_info *map, int primary) __attribute__((alias("cfi_cmdset_0001")));
EXPORT_SYMBOL_GPL(cfi_cmdset_0001);
EXPORT_SYMBOL_GPL(cfi_cmdset_0003);
EXPORT_SYMBOL_GPL(cfi_cmdset_0200);
static struct mtd_info *cfi_intelext_setup(struct mtd_info *mtd)
{
struct map_info *map = mtd->priv;
struct cfi_private *cfi = map->fldrv_priv;
unsigned long offset = 0;
int i,j;
unsigned long devsize = (1<<cfi->cfiq->DevSize) * cfi->interleave;
//printk(KERN_DEBUG "number of CFI chips: %d\n", cfi->numchips);
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_ERR "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;
mtd->eraseregions[(j*cfi->cfiq->NumEraseRegions)+i].lockmap = kmalloc(ernum / 8 + 1, GFP_KERNEL);
}
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;
}
for (i=0; i<mtd->numeraseregions;i++){
printk(KERN_DEBUG "erase region %d: offset=0x%x,size=0x%x,blocks=%d\n",
i,mtd->eraseregions[i].offset,
mtd->eraseregions[i].erasesize,
mtd->eraseregions[i].numblocks);
}
#ifdef CONFIG_MTD_OTP
mtd->read_fact_prot_reg = cfi_intelext_read_fact_prot_reg;
mtd->read_user_prot_reg = cfi_intelext_read_user_prot_reg;
mtd->write_user_prot_reg = cfi_intelext_write_user_prot_reg;
mtd->lock_user_prot_reg = cfi_intelext_lock_user_prot_reg;
mtd->get_fact_prot_info = cfi_intelext_get_fact_prot_info;
mtd->get_user_prot_info = cfi_intelext_get_user_prot_info;
#endif
/* This function has the potential to distort the reality
a bit and therefore should be called last. */
if (cfi_intelext_partition_fixup(mtd, &cfi) != 0)
goto setup_err;
__module_get(THIS_MODULE);
register_reboot_notifier(&mtd->reboot_notifier);
return mtd;
setup_err:
if(mtd) {
kfree(mtd->eraseregions);
kfree(mtd);
}
kfree(cfi->cmdset_priv);
return NULL;
}
static int cfi_intelext_partition_fixup(struct mtd_info *mtd,
struct cfi_private **pcfi)
{
struct map_info *map = mtd->priv;
struct cfi_private *cfi = *pcfi;
struct cfi_pri_intelext *extp = cfi->cmdset_priv;
/*
* Probing of multi-partition flash chips.
*
* To support multiple partitions when available, we simply arrange
* for each of them to have their own flchip structure even if they
* are on the same physical chip. This means completely recreating
* a new cfi_private structure right here which is a blatent code
* layering violation, but this is still the least intrusive
* arrangement at this point. This can be rearranged in the future
* if someone feels motivated enough. --nico
*/
if (extp && extp->MajorVersion == '1' && extp->MinorVersion >= '3'
&& extp->FeatureSupport & (1 << 9)) {
struct cfi_private *newcfi;
struct flchip *chip;
struct flchip_shared *shared;
int offs, numregions, numparts, partshift, numvirtchips, i, j;
/* Protection Register info */
offs = (extp->NumProtectionFields - 1) *
sizeof(struct cfi_intelext_otpinfo);
/* Burst Read info */
offs += extp->extra[offs+1]+2;
/* Number of partition regions */
numregions = extp->extra[offs];
offs += 1;
/* skip the sizeof(partregion) field in CFI 1.4 */
if (extp->MinorVersion >= '4')
offs += 2;
/* Number of hardware partitions */
numparts = 0;
for (i = 0; i < numregions; i++) {
struct cfi_intelext_regioninfo *rinfo;
rinfo = (struct cfi_intelext_regioninfo *)&extp->extra[offs];
numparts += rinfo->NumIdentPartitions;
offs += sizeof(*rinfo)
+ (rinfo->NumBlockTypes - 1) *
sizeof(struct cfi_intelext_blockinfo);
}
if (!numparts)
numparts = 1;
/* Programming Region info */
if (extp->MinorVersion >= '4') {
struct cfi_intelext_programming_regioninfo *prinfo;
prinfo = (struct cfi_intelext_programming_regioninfo *)&extp->extra[offs];
mtd->writesize = cfi->interleave << prinfo->ProgRegShift;
mtd->flags &= ~MTD_BIT_WRITEABLE;
printk(KERN_DEBUG "%s: program region size/ctrl_valid/ctrl_inval = %d/%d/%d\n",
map->name, mtd->writesize,
cfi->interleave * prinfo->ControlValid,
cfi->interleave * prinfo->ControlInvalid);
}
/*
* All functions below currently rely on all chips having
* the same geometry so we'll just assume that all hardware
* partitions are of the same size too.
*/
partshift = cfi->chipshift - __ffs(numparts);
if ((1 << partshift) < mtd->erasesize) {
printk( KERN_ERR
"%s: bad number of hw partitions (%d)\n",
__func__, numparts);
return -EINVAL;
}
numvirtchips = cfi->numchips * numparts;
newcfi = kmalloc(sizeof(struct cfi_private) + numvirtchips * sizeof(struct flchip), GFP_KERNEL);
if (!newcfi)
return -ENOMEM;
shared = kmalloc(sizeof(struct flchip_shared) * cfi->numchips, GFP_KERNEL);
if (!shared) {
kfree(newcfi);
return -ENOMEM;
}
memcpy(newcfi, cfi, sizeof(struct cfi_private));
newcfi->numchips = numvirtchips;
newcfi->chipshift = partshift;
chip = &newcfi->chips[0];
for (i = 0; i < cfi->numchips; i++) {
shared[i].writing = shared[i].erasing = NULL;
spin_lock_init(&shared[i].lock);
for (j = 0; j < numparts; j++) {
*chip = cfi->chips[i];
chip->start += j << partshift;
chip->priv = &shared[i];
/* those should be reset too since
they create memory references. */
init_waitqueue_head(&chip->wq);
spin_lock_init(&chip->_spinlock);
chip->mutex = &chip->_spinlock;
chip++;
}
}
printk(KERN_DEBUG "%s: %d set(s) of %d interleaved chips "
"--> %d partitions of %d KiB\n",
map->name, cfi->numchips, cfi->interleave,
newcfi->numchips, 1<<(newcfi->chipshift-10));
map->fldrv_priv = newcfi;
*pcfi = newcfi;
kfree(cfi);
}
return 0;
}
/*
* *********** CHIP ACCESS FUNCTIONS ***********
*/
static int chip_ready (struct map_info *map, struct flchip *chip, unsigned long adr, int mode)
{
DECLARE_WAITQUEUE(wait, current);
struct cfi_private *cfi = map->fldrv_priv;
map_word status, status_OK = CMD(0x80), status_PWS = CMD(0x01);
struct cfi_pri_intelext *cfip = cfi->cmdset_priv;
unsigned long timeo = jiffies + HZ;
switch (chip->state) {
case FL_STATUS:
for (;;) {
status = map_read(map, adr);
if (map_word_andequal(map, status, status_OK, status_OK))
break;
/* At this point we're fine with write operations
in other partitions as they don't conflict. */
if (chip->priv && map_word_andequal(map, status, status_PWS, status_PWS))
break;
spin_unlock(chip->mutex);
cfi_udelay(1);
spin_lock(chip->mutex);
/* Someone else might have been playing with it. */
return -EAGAIN;
}
/* Fall through */
case FL_READY:
case FL_CFI_QUERY:
case FL_JEDEC_QUERY:
return 0;
case FL_ERASING:
if (!cfip ||
!(cfip->FeatureSupport & 2) ||
!(mode == FL_READY || mode == FL_POINT ||
(mode == FL_WRITING && (cfip->SuspendCmdSupport & 1))))
goto sleep;
/* Erase suspend */
map_write(map, CMD(0xB0), adr);
/* If the flash has finished erasing, then 'erase suspend'
* appears to make some (28F320) flash devices switch to
* 'read' mode. Make sure that we switch to 'read status'
* mode so we get the right data. --rmk
*/
map_write(map, CMD(0x70), adr);
chip->oldstate = FL_ERASING;
chip->state = FL_ERASE_SUSPENDING;
chip->erase_suspended = 1;
for (;;) {
status = map_read(map, adr);
if (map_word_andequal(map, status, status_OK, status_OK))
break;
if (time_after(jiffies, timeo)) {
/* Urgh. Resume and pretend we weren't here. */
map_write(map, CMD(0xd0), adr);
/* Make sure we're in 'read status' mode if it had finished */
map_write(map, CMD(0x70), adr);
chip->state = FL_ERASING;
chip->oldstate = FL_READY;
printk(KERN_ERR "%s: Chip not ready after erase "
"suspended: status = 0x%lx\n", map->name, status.x[0]);
return -EIO;
}
spin_unlock(chip->mutex);
cfi_udelay(1);
spin_lock(chip->mutex);
/* Nobody will touch it while it's in state FL_ERASE_SUSPENDING.
So we can just loop here. */
}
chip->state = FL_STATUS;
return 0;
case FL_XIP_WHILE_ERASING:
if (mode != FL_READY && mode != FL_POINT &&
(mode != FL_WRITING || !cfip || !(cfip->SuspendCmdSupport&1)))
goto sleep;
chip->oldstate = chip->state;
chip->state = FL_READY;
return 0;
case FL_SHUTDOWN:
/* The machine is rebooting now,so no one can get chip anymore */
return -EIO;
case FL_POINT:
/* Only if there's no operation suspended... */
if (mode == FL_READY && chip->oldstate == FL_READY)
return 0;
/* Fall through */
default:
sleep:
set_current_state(TASK_UNINTERRUPTIBLE);
add_wait_queue(&chip->wq, &wait);
spin_unlock(chip->mutex);
schedule();
remove_wait_queue(&chip->wq, &wait);
spin_lock(chip->mutex);
return -EAGAIN;
}
}
static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr, int mode)
{
int ret;
DECLARE_WAITQUEUE(wait, current);
retry:
if (chip->priv && (mode == FL_WRITING || mode == FL_ERASING
|| mode == FL_OTP_WRITE || mode == FL_SHUTDOWN)) {
/*
* OK. We have possibility for contention on the write/erase
* operations which are global to the real chip and not per
* partition. So let's fight it over in the partition which
* currently has authority on the operation.
*
* The rules are as follows:
*
* - any write operation must own shared->writing.
*
* - any erase operation must own _both_ shared->writing and
* shared->erasing.
*
* - contention arbitration is handled in the owner's context.
*
* The 'shared' struct can be read and/or written only when
* its lock is taken.
*/
struct flchip_shared *shared = chip->priv;
struct flchip *contender;
spin_lock(&shared->lock);
contender = shared->writing;
if (contender && contender != chip) {
/*
* The engine to perform desired operation on this
* partition is already in use by someone else.
* Let's fight over it in the context of the chip
* currently using it. If it is possible to suspend,
* that other partition will do just that, otherwise
* it'll happily send us to sleep. In any case, when
* get_chip returns success we're clear to go ahead.
*/
ret = spin_trylock(contender->mutex);
spin_unlock(&shared->lock);
if (!ret)
goto retry;
spin_unlock(chip->mutex);
ret = chip_ready(map, contender, contender->start, mode);
spin_lock(chip->mutex);
if (ret == -EAGAIN) {
spin_unlock(contender->mutex);
goto retry;
}
if (ret) {
spin_unlock(contender->mutex);
return ret;
}
spin_lock(&shared->lock);
spin_unlock(contender->mutex);
}
/* Check if we already have suspended erase
* on this chip. Sleep. */
if (mode == FL_ERASING && shared->erasing
&& shared->erasing->oldstate == FL_ERASING) {
spin_unlock(&shared->lock);
set_current_state(TASK_UNINTERRUPTIBLE);
add_wait_queue(&chip->wq, &wait);
spin_unlock(chip->mutex);
schedule();
remove_wait_queue(&chip->wq, &wait);
spin_lock(chip->mutex);
goto retry;
}
/* We now own it */
shared->writing = chip;
if (mode == FL_ERASING)
shared->erasing = chip;
spin_unlock(&shared->lock);
}
ret = chip_ready(map, chip, adr, mode);
if (ret == -EAGAIN)
goto retry;
return ret;
}
static void put_chip(struct map_info *map, struct flchip *chip, unsigned long adr)
{
struct cfi_private *cfi = map->fldrv_priv;
if (chip->priv) {
struct flchip_shared *shared = chip->priv;
spin_lock(&shared->lock);
if (shared->writing == chip && chip->oldstate == FL_READY) {
/* We own the ability to write, but we're done */
shared->writing = shared->erasing;
if (shared->writing && shared->writing != chip) {
/* give back ownership to who we loaned it from */
struct flchip *loaner = shared->writing;
spin_lock(loaner->mutex);
spin_unlock(&shared->lock);
spin_unlock(chip->mutex);
put_chip(map, loaner, loaner->start);
spin_lock(chip->mutex);
spin_unlock(loaner->mutex);
wake_up(&chip->wq);
return;
}
shared->erasing = NULL;
shared->writing = NULL;
} else if (shared->erasing == chip && shared->writing != chip) {
/*
* We own the ability to erase without the ability
* to write, which means the erase was suspended
* and some other partition is currently writing.
* Don't let the switch below mess things up since
* we don't have ownership to resume anything.
*/
spin_unlock(&shared->lock);
wake_up(&chip->wq);
return;
}
spin_unlock(&shared->lock);
}
switch(chip->oldstate) {
case FL_ERASING:
chip->state = chip->oldstate;
/* What if one interleaved chip has finished and the
other hasn't? The old code would leave the finished
one in READY mode. That's bad, and caused -EROFS
errors to be returned from do_erase_oneblock because
that's the only bit it checked for at the time.
As the state machine appears to explicitly allow
sending the 0x70 (Read Status) command to an erasing
chip and expecting it to be ignored, that's what we
do. */
map_write(map, CMD(0xd0), adr);
map_write(map, CMD(0x70), adr);
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:
case FL_JEDEC_QUERY:
/* We should really make set_vpp() count, rather than doing this */
DISABLE_VPP(map);
break;
default:
printk(KERN_ERR "%s: put_chip() called with oldstate %d!!\n", map->name, 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(0xff), adr);
chip->state = FL_READY;
}
(void) map_read(map, adr);
xip_iprefetch();
local_irq_enable();
}
/*