forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
267 lines
6.6 KiB
267 lines
6.6 KiB
/* |
|
* Routines common to all CFI-type probes. |
|
* (C) 2001-2003 Red Hat, Inc. |
|
* GPL'd |
|
*/ |
|
|
|
#include <linux/kernel.h> |
|
#include <linux/slab.h> |
|
#include <linux/module.h> |
|
#include <linux/mtd/mtd.h> |
|
#include <linux/mtd/map.h> |
|
#include <linux/mtd/cfi.h> |
|
#include <linux/mtd/gen_probe.h> |
|
|
|
static struct mtd_info *check_cmd_set(struct map_info *, int); |
|
static struct cfi_private *genprobe_ident_chips(struct map_info *map, |
|
struct chip_probe *cp); |
|
static int genprobe_new_chip(struct map_info *map, struct chip_probe *cp, |
|
struct cfi_private *cfi); |
|
|
|
struct mtd_info *mtd_do_chip_probe(struct map_info *map, struct chip_probe *cp) |
|
{ |
|
struct mtd_info *mtd; |
|
struct cfi_private *cfi; |
|
|
|
/* First probe the map to see if we have CFI stuff there. */ |
|
cfi = genprobe_ident_chips(map, cp); |
|
|
|
if (!cfi) |
|
return NULL; |
|
|
|
map->fldrv_priv = cfi; |
|
/* OK we liked it. Now find a driver for the command set it talks */ |
|
|
|
mtd = check_cmd_set(map, 1); /* First the primary cmdset */ |
|
if (!mtd) |
|
mtd = check_cmd_set(map, 0); /* Then the secondary */ |
|
|
|
if (mtd) { |
|
if (mtd->size > map->size) { |
|
printk(KERN_WARNING "Reducing visibility of %ldKiB chip to %ldKiB\n", |
|
(unsigned long)mtd->size >> 10, |
|
(unsigned long)map->size >> 10); |
|
mtd->size = map->size; |
|
} |
|
return mtd; |
|
} |
|
|
|
printk(KERN_WARNING"gen_probe: No supported Vendor Command Set found\n"); |
|
|
|
kfree(cfi->cfiq); |
|
kfree(cfi); |
|
map->fldrv_priv = NULL; |
|
return NULL; |
|
} |
|
EXPORT_SYMBOL(mtd_do_chip_probe); |
|
|
|
|
|
static struct cfi_private *genprobe_ident_chips(struct map_info *map, struct chip_probe *cp) |
|
{ |
|
struct cfi_private cfi; |
|
struct cfi_private *retcfi; |
|
unsigned long *chip_map; |
|
int i, j, mapsize; |
|
int max_chips; |
|
|
|
memset(&cfi, 0, sizeof(cfi)); |
|
|
|
/* Call the probetype-specific code with all permutations of |
|
interleave and device type, etc. */ |
|
if (!genprobe_new_chip(map, cp, &cfi)) { |
|
/* The probe didn't like it */ |
|
pr_debug("%s: Found no %s device at location zero\n", |
|
cp->name, map->name); |
|
return NULL; |
|
} |
|
|
|
#if 0 /* Let the CFI probe routine do this sanity check. The Intel and AMD |
|
probe routines won't ever return a broken CFI structure anyway, |
|
because they make them up themselves. |
|
*/ |
|
if (cfi.cfiq->NumEraseRegions == 0) { |
|
printk(KERN_WARNING "Number of erase regions is zero\n"); |
|
kfree(cfi.cfiq); |
|
return NULL; |
|
} |
|
#endif |
|
cfi.chipshift = cfi.cfiq->DevSize; |
|
|
|
if (cfi_interleave_is_1(&cfi)) { |
|
; |
|
} else if (cfi_interleave_is_2(&cfi)) { |
|
cfi.chipshift++; |
|
} else if (cfi_interleave_is_4((&cfi))) { |
|
cfi.chipshift += 2; |
|
} else if (cfi_interleave_is_8(&cfi)) { |
|
cfi.chipshift += 3; |
|
} else { |
|
BUG(); |
|
} |
|
|
|
cfi.numchips = 1; |
|
|
|
/* |
|
* Allocate memory for bitmap of valid chips. |
|
* Align bitmap storage size to full byte. |
|
*/ |
|
max_chips = map->size >> cfi.chipshift; |
|
if (!max_chips) { |
|
printk(KERN_WARNING "NOR chip too large to fit in mapping. Attempting to cope...\n"); |
|
max_chips = 1; |
|
} |
|
|
|
mapsize = sizeof(long) * DIV_ROUND_UP(max_chips, BITS_PER_LONG); |
|
chip_map = kzalloc(mapsize, GFP_KERNEL); |
|
if (!chip_map) { |
|
kfree(cfi.cfiq); |
|
return NULL; |
|
} |
|
|
|
set_bit(0, chip_map); /* Mark first chip valid */ |
|
|
|
/* |
|
* Now probe for other chips, checking sensibly for aliases while |
|
* we're at it. The new_chip probe above should have let the first |
|
* chip in read mode. |
|
*/ |
|
|
|
for (i = 1; i < max_chips; i++) { |
|
cp->probe_chip(map, i << cfi.chipshift, chip_map, &cfi); |
|
} |
|
|
|
/* |
|
* Now allocate the space for the structures we need to return to |
|
* our caller, and copy the appropriate data into them. |
|
*/ |
|
|
|
retcfi = kmalloc(struct_size(retcfi, chips, cfi.numchips), GFP_KERNEL); |
|
|
|
if (!retcfi) { |
|
kfree(cfi.cfiq); |
|
kfree(chip_map); |
|
return NULL; |
|
} |
|
|
|
memcpy(retcfi, &cfi, sizeof(cfi)); |
|
memset(&retcfi->chips[0], 0, sizeof(struct flchip) * cfi.numchips); |
|
|
|
for (i = 0, j = 0; (j < cfi.numchips) && (i < max_chips); i++) { |
|
if(test_bit(i, chip_map)) { |
|
struct flchip *pchip = &retcfi->chips[j++]; |
|
|
|
pchip->start = (i << cfi.chipshift); |
|
pchip->state = FL_READY; |
|
init_waitqueue_head(&pchip->wq); |
|
mutex_init(&pchip->mutex); |
|
} |
|
} |
|
|
|
kfree(chip_map); |
|
return retcfi; |
|
} |
|
|
|
|
|
static int genprobe_new_chip(struct map_info *map, struct chip_probe *cp, |
|
struct cfi_private *cfi) |
|
{ |
|
int min_chips = (map_bankwidth(map)/4?:1); /* At most 4-bytes wide. */ |
|
int max_chips = map_bankwidth(map); /* And minimum 1 */ |
|
int nr_chips, type; |
|
|
|
for (nr_chips = max_chips; nr_chips >= min_chips; nr_chips >>= 1) { |
|
|
|
if (!cfi_interleave_supported(nr_chips)) |
|
continue; |
|
|
|
cfi->interleave = nr_chips; |
|
|
|
/* Minimum device size. Don't look for one 8-bit device |
|
in a 16-bit bus, etc. */ |
|
type = map_bankwidth(map) / nr_chips; |
|
|
|
for (; type <= CFI_DEVICETYPE_X32; type<<=1) { |
|
cfi->device_type = type; |
|
|
|
if (cp->probe_chip(map, 0, NULL, cfi)) |
|
return 1; |
|
} |
|
} |
|
return 0; |
|
} |
|
|
|
typedef struct mtd_info *cfi_cmdset_fn_t(struct map_info *, int); |
|
|
|
extern cfi_cmdset_fn_t cfi_cmdset_0001; |
|
extern cfi_cmdset_fn_t cfi_cmdset_0002; |
|
extern cfi_cmdset_fn_t cfi_cmdset_0020; |
|
|
|
static inline struct mtd_info *cfi_cmdset_unknown(struct map_info *map, |
|
int primary) |
|
{ |
|
struct cfi_private *cfi = map->fldrv_priv; |
|
__u16 type = primary?cfi->cfiq->P_ID:cfi->cfiq->A_ID; |
|
#ifdef CONFIG_MODULES |
|
cfi_cmdset_fn_t *probe_function; |
|
char *probename; |
|
|
|
probename = kasprintf(GFP_KERNEL, "cfi_cmdset_%4.4X", type); |
|
if (!probename) |
|
return NULL; |
|
|
|
probe_function = __symbol_get(probename); |
|
if (!probe_function) { |
|
request_module("cfi_cmdset_%4.4X", type); |
|
probe_function = __symbol_get(probename); |
|
} |
|
kfree(probename); |
|
|
|
if (probe_function) { |
|
struct mtd_info *mtd; |
|
|
|
mtd = (*probe_function)(map, primary); |
|
/* If it was happy, it'll have increased its own use count */ |
|
symbol_put_addr(probe_function); |
|
return mtd; |
|
} |
|
#endif |
|
printk(KERN_NOTICE "Support for command set %04X not present\n", type); |
|
|
|
return NULL; |
|
} |
|
|
|
static struct mtd_info *check_cmd_set(struct map_info *map, int primary) |
|
{ |
|
struct cfi_private *cfi = map->fldrv_priv; |
|
__u16 type = primary?cfi->cfiq->P_ID:cfi->cfiq->A_ID; |
|
|
|
if (type == P_ID_NONE || type == P_ID_RESERVED) |
|
return NULL; |
|
|
|
switch(type){ |
|
/* We need these for the !CONFIG_MODULES case, |
|
because symbol_get() doesn't work there */ |
|
#ifdef CONFIG_MTD_CFI_INTELEXT |
|
case P_ID_INTEL_EXT: |
|
case P_ID_INTEL_STD: |
|
case P_ID_INTEL_PERFORMANCE: |
|
return cfi_cmdset_0001(map, primary); |
|
#endif |
|
#ifdef CONFIG_MTD_CFI_AMDSTD |
|
case P_ID_AMD_STD: |
|
case P_ID_SST_OLD: |
|
case P_ID_WINBOND: |
|
return cfi_cmdset_0002(map, primary); |
|
#endif |
|
#ifdef CONFIG_MTD_CFI_STAA |
|
case P_ID_ST_ADV: |
|
return cfi_cmdset_0020(map, primary); |
|
#endif |
|
default: |
|
return cfi_cmdset_unknown(map, primary); |
|
} |
|
} |
|
|
|
MODULE_LICENSE("GPL"); |
|
MODULE_AUTHOR("David Woodhouse <[email protected]>"); |
|
MODULE_DESCRIPTION("Helper routines for flash chip probe code");
|
|
|