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/*
Common Flash Interface probe code.
(C) 2000 Red Hat. GPL'd.
$Id: jedec_probe.c,v 1.3 2001/10/02 15:05:12 dwmw2 Exp $
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <asm/io.h>
#include <asm/byteorder.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/mtd/map.h>
#include <linux/mtd/cfi.h>
#include <linux/mtd/gen_probe.h>
/* Manufacturers */
#define MANUFACTURER_AMD 0x0001
#define MANUFACTURER_FUJITSU 0x0004
#define MANUFACTURER_ATMEL 0x001f
#define MANUFACTURER_ST 0x0020
#define MANUFACTURER_SST 0x00BF
#define MANUFACTURER_TOSHIBA 0x0098
/* AMD */
#define AM29F800BB 0x2258
#define AM29F800BT 0x22D6
#define AM29LV800BB 0x225B
#define AM29LV800BT 0x22DA
#define AM29LV160DT 0x22C4
#define AM29LV160DB 0x2249
/* Atmel */
#define AT49BV16X4 0x00c0
#define AT49BV16X4T 0x00c2
/* Fujitsu */
#define MBM29LV160TE 0x22C4
#define MBM29LV160BE 0x2249
/* ST - www.st.com */
#define M29W800T 0x00D7
#define M29W160DT 0x22C4
#define M29W160DB 0x2249
/* SST */
#define SST39LF800 0x2781
#define SST39LF160 0x2782
/* Toshiba */
#define TC58FVT160 0x00C2
#define TC58FVB160 0x0043
struct amd_flash_info {
const __u16 mfr_id;
const __u16 dev_id;
const char *name;
const int DevSize;
const int InterfaceDesc;
const int NumEraseRegions;
const ulong regions[4];
};
#define ERASEINFO(size,blocks) (size<<8)|(blocks-1)
#define SIZE_1MiB 20
#define SIZE_2MiB 21
#define SIZE_4MiB 22
static const struct amd_flash_info jedec_table[] = {
{
mfr_id: MANUFACTURER_AMD,
dev_id: AM29LV160DT,
name: "AMD AM29LV160DT",
DevSize: SIZE_2MiB,
NumEraseRegions: 4,
regions: {ERASEINFO(0x10000,31),
ERASEINFO(0x08000,1),
ERASEINFO(0x02000,2),
ERASEINFO(0x04000,1)
}
}, {
mfr_id: MANUFACTURER_AMD,
dev_id: AM29LV160DB,
name: "AMD AM29LV160DB",
DevSize: SIZE_2MiB,
NumEraseRegions: 4,
regions: {ERASEINFO(0x04000,1),
ERASEINFO(0x02000,2),
ERASEINFO(0x08000,1),
ERASEINFO(0x10000,31)
}
}, {
mfr_id: MANUFACTURER_TOSHIBA,
dev_id: TC58FVT160,
name: "Toshiba TC58FVT160",
DevSize: SIZE_2MiB,
NumEraseRegions: 4,
regions: {ERASEINFO(0x10000,31),
ERASEINFO(0x08000,1),
ERASEINFO(0x02000,2),
ERASEINFO(0x04000,1)
}
}, {
mfr_id: MANUFACTURER_FUJITSU,
dev_id: MBM29LV160TE,
name: "Fujitsu MBM29LV160TE",
DevSize: SIZE_2MiB,
NumEraseRegions: 4,
regions: {ERASEINFO(0x10000,31),
ERASEINFO(0x08000,1),
ERASEINFO(0x02000,2),
ERASEINFO(0x04000,1)
}
}, {
mfr_id: MANUFACTURER_TOSHIBA,
dev_id: TC58FVB160,
name: "Toshiba TC58FVB160",
DevSize: SIZE_2MiB,
NumEraseRegions: 4,
regions: {ERASEINFO(0x04000,1),
ERASEINFO(0x02000,2),
ERASEINFO(0x08000,1),
ERASEINFO(0x10000,31)
}
}, {
mfr_id: MANUFACTURER_FUJITSU,
dev_id: MBM29LV160BE,
name: "Fujitsu MBM29LV160BE",
DevSize: SIZE_2MiB,
NumEraseRegions: 4,
regions: {ERASEINFO(0x04000,1),
ERASEINFO(0x02000,2),
ERASEINFO(0x08000,1),
ERASEINFO(0x10000,31)
}
}, {
mfr_id: MANUFACTURER_AMD,
dev_id: AM29LV800BB,
name: "AMD AM29LV800BB",
DevSize: SIZE_1MiB,
NumEraseRegions: 4,
regions: {ERASEINFO(0x04000,1),
ERASEINFO(0x02000,2),
ERASEINFO(0x08000,1),
ERASEINFO(0x10000,15),
}
}, {
mfr_id: MANUFACTURER_AMD,
dev_id: AM29F800BB,
name: "AMD AM29F800BB",
DevSize: SIZE_1MiB,
NumEraseRegions: 4,
regions: {ERASEINFO(0x04000,1),
ERASEINFO(0x02000,2),
ERASEINFO(0x08000,1),
ERASEINFO(0x10000,15),
}
}, {
mfr_id: MANUFACTURER_AMD,
dev_id: AM29LV800BT,
name: "AMD AM29LV800BT",
DevSize: SIZE_1MiB,
NumEraseRegions: 4,
regions: {ERASEINFO(0x10000,15),
ERASEINFO(0x08000,1),
ERASEINFO(0x02000,2),
ERASEINFO(0x04000,1)
}
}, {
mfr_id: MANUFACTURER_AMD,
dev_id: AM29F800BT,
name: "AMD AM29F800BT",
DevSize: SIZE_1MiB,
NumEraseRegions: 4,
regions: {ERASEINFO(0x10000,15),
ERASEINFO(0x08000,1),
ERASEINFO(0x02000,2),
ERASEINFO(0x04000,1)
}
}, {
mfr_id: MANUFACTURER_AMD,
dev_id: AM29LV800BB,
name: "AMD AM29LV800BB",
DevSize: SIZE_1MiB,
NumEraseRegions: 4,
regions: {ERASEINFO(0x10000,15),
ERASEINFO(0x08000,1),
ERASEINFO(0x02000,2),
ERASEINFO(0x04000,1)
}
}, {
mfr_id: MANUFACTURER_ST,
dev_id: M29W800T,
name: "ST M29W800T",
DevSize: SIZE_1MiB,
NumEraseRegions: 4,
regions: {ERASEINFO(0x10000,15),
ERASEINFO(0x08000,1),
ERASEINFO(0x02000,2),
ERASEINFO(0x04000,1)
}
}, {
mfr_id: MANUFACTURER_ST,
dev_id: M29W160DT,
name: "ST M29W160DT",
DevSize: SIZE_2MiB,
NumEraseRegions: 4,
regions: {ERASEINFO(0x10000,31),
ERASEINFO(0x08000,1),
ERASEINFO(0x02000,2),
ERASEINFO(0x04000,1)
}
}, {
mfr_id: MANUFACTURER_ST,
dev_id: M29W160DB,
name: "ST M29W160DB",
DevSize: SIZE_2MiB,
NumEraseRegions: 4,
regions: {ERASEINFO(0x04000,1),
ERASEINFO(0x02000,2),
ERASEINFO(0x08000,1),
ERASEINFO(0x10000,31)
}
}, {
mfr_id: MANUFACTURER_ATMEL,
dev_id: AT49BV16X4,
name: "Atmel AT49BV16X4",
DevSize: SIZE_2MiB,
NumEraseRegions: 3,
regions: {ERASEINFO(0x02000,8),
ERASEINFO(0x08000,2),
ERASEINFO(0x10000,30)
}
}, {
mfr_id: MANUFACTURER_ATMEL,
dev_id: AT49BV16X4T,
name: "Atmel AT49BV16X4T",
DevSize: SIZE_2MiB,
NumEraseRegions: 3,
regions: {ERASEINFO(0x10000,30),
ERASEINFO(0x08000,2),
ERASEINFO(0x02000,8)
}
}
};
static int cfi_jedec_setup(struct cfi_private *p_cfi, int index);
static int jedec_probe_chip(struct map_info *map, __u32 base,
struct flchip *chips, struct cfi_private *cfi);
struct mtd_info *jedec_probe(struct map_info *map);
#define jedec_read_mfr(map, base, osf) cfi_read(map, base)
#define jedec_read_id(map, base, osf) cfi_read(map, (base)+(osf))
static int cfi_jedec_setup(struct cfi_private *p_cfi, int index)
{
int i,num_erase_regions;
printk("Found: %s\n",jedec_table[index].name);
num_erase_regions = jedec_table[index].NumEraseRegions;
p_cfi->cfiq = kmalloc(sizeof(struct cfi_ident) + num_erase_regions * 4, GFP_KERNEL);
if (!p_cfi->cfiq) {
//xx printk(KERN_WARNING "%s: kmalloc failed for CFI ident structure\n", map->name);
return 0;
}
memset(p_cfi->cfiq,0,sizeof(struct cfi_ident));
p_cfi->cfiq->P_ID = P_ID_AMD_STD;
p_cfi->cfiq->NumEraseRegions = jedec_table[index].NumEraseRegions;
p_cfi->cfiq->DevSize = jedec_table[index].DevSize;
for (i=0; i<num_erase_regions; i++){
p_cfi->cfiq->EraseRegionInfo[i] = jedec_table[index].regions[i];
}
return 1; /* ok */
}
static int jedec_probe_chip(struct map_info *map, __u32 base,
struct flchip *chips, struct cfi_private *cfi)
{
int i;
int osf = cfi->interleave * cfi->device_type;
int retried = 0;
if (!cfi->numchips) {
switch (cfi->device_type) {
case CFI_DEVICETYPE_X8:
cfi->addr_unlock1 = 0x555;
cfi->addr_unlock2 = 0x2aa;
break;
case CFI_DEVICETYPE_X16:
cfi->addr_unlock1 = 0xaaa;
if (map->buswidth == cfi->interleave) {
/* X16 chip(s) in X8 mode */
cfi->addr_unlock2 = 0x555;
} else {
cfi->addr_unlock2 = 0x554;
}
break;
case CFI_DEVICETYPE_X32:
cfi->addr_unlock1 = 0x1555;
cfi->addr_unlock2 = 0xaaa;
break;
default:
printk(KERN_NOTICE "Eep. Unknown jedec_probe device type %d\n", cfi->device_type);
return 0;
}
}
retry:
/* Reset */
cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
/* Autoselect Mode */
cfi_send_gen_cmd(0xaa, cfi->addr_unlock1, base, map, cfi, CFI_DEVICETYPE_X8, NULL);
cfi_send_gen_cmd(0x55, cfi->addr_unlock2, base, map, cfi, CFI_DEVICETYPE_X8, NULL);
cfi_send_gen_cmd(0x90, cfi->addr_unlock1, base, map, cfi, CFI_DEVICETYPE_X8, NULL);
if (!cfi->numchips) {
/* This is the first time we're called. Set up the CFI
stuff accordingly and return */
cfi->mfr = jedec_read_mfr(map, base, osf);
cfi->id = jedec_read_id(map, base, osf);
for (i=0; i<sizeof(jedec_table)/sizeof(jedec_table[0]); i++) {
if (cfi->mfr == jedec_table[i].mfr_id &&
cfi->id == jedec_table[i].dev_id)
return cfi_jedec_setup(cfi, i);
}
if (!retried++) {
/* Deal with whichever strange chips these were */
cfi->addr_unlock1 |= cfi->addr_unlock1 << 8;
cfi->addr_unlock2 |= cfi->addr_unlock2 << 8;
goto retry;
}
return 0;
}
/* Check each previous chip to see if it's an alias */
for (i=0; i<cfi->numchips; i++) {
/* This chip should be in read mode if it's one
we've already touched. */
if (jedec_read_mfr(map, base, osf) == cfi->mfr &&
jedec_read_id(map, base, osf) == cfi->id) {
/* Eep. This chip also looks like it's in autoselect mode.
Is it an alias for the new one? */
cfi_send_gen_cmd(0xF0, 0, chips[i].start, map, cfi, cfi->device_type, NULL);
/* If the device IDs go away, it's an alias */
if (jedec_read_mfr(map, base, osf) != cfi->mfr ||
jedec_read_id(map, base, osf) != cfi->id) {
printk(KERN_DEBUG "%s: Found an alias at 0x%x for the chip at 0x%lx\n",
map->name, base, chips[i].start);
return 0;
}
/* Yes, it's actually got the device IDs as data. Most
* unfortunate. Stick the new chip in read mode
* too and if it's the same, assume it's an alias. */
/* FIXME: Use other modes to do a proper check */
cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
if (jedec_read_mfr(map, base, osf) == cfi->mfr &&
jedec_read_id(map, base, osf) == cfi->id) {
printk(KERN_DEBUG "%s: Found an alias at 0x%x for the chip at 0x%lx\n",
map->name, base, chips[i].start);
return 0;
}
}
}
/* OK, if we got to here, then none of the previous chips appear to
be aliases for the current one. */
if (cfi->numchips == MAX_CFI_CHIPS) {
printk(KERN_WARNING"%s: Too many flash chips detected. Increase MAX_CFI_CHIPS from %d.\n", map->name, MAX_CFI_CHIPS);
/* Doesn't matter about resetting it to Read Mode - we're not going to talk to it anyway */
return -1;
}
chips[cfi->numchips].start = base;
chips[cfi->numchips].state = FL_READY;
cfi->numchips++;
/* Put it back into Read Mode */
cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
printk(KERN_INFO "%s: Found %d x%d devices at 0x%x in %d-bit mode\n",
map->name, cfi->interleave, cfi->device_type*8, base,
map->buswidth*8);
return 1;
}
static struct chip_probe jedec_chip_probe = {
name: "JEDEC",
probe_chip: jedec_probe_chip
};
struct mtd_info *jedec_probe(struct map_info *map)
{
/*
* Just use the generic probe stuff to call our CFI-specific
* chip_probe routine in all the possible permutations, etc.
*/
return mtd_do_chip_probe(map, &jedec_chip_probe);
}
static struct mtd_chip_driver jedec_chipdrv = {
probe: jedec_probe,
name: "jedec_probe",
module: THIS_MODULE
};
int __init jedec_probe_init(void)
{
register_mtd_chip_driver(&jedec_chipdrv);
return 0;
}
static void __exit jedec_probe_exit(void)
{
unregister_mtd_chip_driver(&jedec_chipdrv);
}
module_init(jedec_probe_init);
module_exit(jedec_probe_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Erwin Authried <eauth@softsys.co.at> et al.");
MODULE_DESCRIPTION("Probe code for JEDEC-compliant flash chips");
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