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/*
Common Flash Interface probe code.
(C) 2000 Red Hat. GPL'd.
$Id: cfi_probe.c,v 1.66 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>
//#define DEBUG_CFI
#ifdef DEBUG_CFI
static void print_cfi_ident(struct cfi_ident *);
#endif
int cfi_jedec_setup(struct cfi_private *p_cfi, int index);
int cfi_jedec_lookup(int index, int mfr_id, int dev_id);
static int cfi_probe_chip(struct map_info *map, __u32 base,
struct flchip *chips, struct cfi_private *cfi);
static int cfi_chip_setup(struct map_info *map, struct cfi_private *cfi);
struct mtd_info *cfi_probe(struct map_info *map);
/* check for QRY, or search for jedec id.
in: interleave,type,mode
ret: table index, <0 for error
*/
static inline int qry_present(struct map_info *map, __u32 base,
struct cfi_private *cfi)
{
int osf = cfi->interleave * cfi->device_type; // scale factor
if (cfi_read(map,base+osf*0x10)==cfi_build_cmd('Q',map,cfi) &&
cfi_read(map,base+osf*0x11)==cfi_build_cmd('R',map,cfi) &&
cfi_read(map,base+osf*0x12)==cfi_build_cmd('Y',map,cfi))
return 1; // ok !
return 0; // nothing found
}
static int cfi_probe_chip(struct map_info *map, __u32 base,
struct flchip *chips, struct cfi_private *cfi)
{
int i;
cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
cfi_send_gen_cmd(0x98, 0x55, base, map, cfi, cfi->device_type, NULL);
if (!qry_present(map,base,cfi))
return 0;
if (!cfi->numchips) {
/* This is the first time we're called. Set up the CFI
stuff accordingly and return */
return cfi_chip_setup(map, cfi);
}
/* 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 (qry_present(map,chips[i].start,cfi)) {
/* Eep. This chip also had the QRY marker.
* 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 QRY marker goes away, it's an alias */
if (!qry_present(map, chips[i].start, cfi)) {
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 QRY for 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 (qry_present(map, base, cfi)) {
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 int cfi_chip_setup(struct map_info *map,
struct cfi_private *cfi)
{
int ofs_factor = cfi->interleave*cfi->device_type;
__u32 base = 0;
int num_erase_regions = cfi_read_query(map, base + (0x10 + 28)*ofs_factor);
int i;
#ifdef DEBUG_CFI
printk("Number of erase regions: %d\n", num_erase_regions);
#endif
if (!num_erase_regions)
return 0;
cfi->cfiq = kmalloc(sizeof(struct cfi_ident) + num_erase_regions * 4, GFP_KERNEL);
if (!cfi->cfiq) {
printk(KERN_WARNING "%s: kmalloc failed for CFI ident structure\n", map->name);
return 0;
}
memset(cfi->cfiq,0,sizeof(struct cfi_ident));
cfi->cfi_mode = 1;
cfi->fast_prog=1; /* CFI supports fast programming */
/* Read the CFI info structure */
for (i=0; i<(sizeof(struct cfi_ident) + num_erase_regions * 4); i++) {
((unsigned char *)cfi->cfiq)[i] = cfi_read_query(map,base + (0x10 + i)*ofs_factor);
}
/* Do any necessary byteswapping */
cfi->cfiq->P_ID = le16_to_cpu(cfi->cfiq->P_ID);
cfi->cfiq->P_ADR = le16_to_cpu(cfi->cfiq->P_ADR);
cfi->cfiq->A_ID = le16_to_cpu(cfi->cfiq->A_ID);
cfi->cfiq->A_ADR = le16_to_cpu(cfi->cfiq->A_ADR);
cfi->cfiq->InterfaceDesc = le16_to_cpu(cfi->cfiq->InterfaceDesc);
cfi->cfiq->MaxBufWriteSize = le16_to_cpu(cfi->cfiq->MaxBufWriteSize);
#ifdef DEBUG_CFI
/* Dump the information therein */
print_cfi_ident(cfi->cfiq);
#endif
for (i=0; i<cfi->cfiq->NumEraseRegions; i++) {
cfi->cfiq->EraseRegionInfo[i] = le32_to_cpu(cfi->cfiq->EraseRegionInfo[i]);
#ifdef DEBUG_CFI
printk(" Erase Region #%d: BlockSize 0x%4.4X bytes, %d blocks\n",
i, (cfi->cfiq->EraseRegionInfo[i] >> 8) & ~0xff,
(cfi->cfiq->EraseRegionInfo[i] & 0xffff) + 1);
#endif
}
/* Put it back into Read Mode */
cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
return 1;
}
#ifdef DEBUG_CFI
static char *vendorname(__u16 vendor)
{
switch (vendor) {
case P_ID_NONE:
return "None";
case P_ID_INTEL_EXT:
return "Intel/Sharp Extended";
case P_ID_AMD_STD:
return "AMD/Fujitsu Standard";
case P_ID_INTEL_STD:
return "Intel/Sharp Standard";
case P_ID_AMD_EXT:
return "AMD/Fujitsu Extended";
case P_ID_MITSUBISHI_STD:
return "Mitsubishi Standard";
case P_ID_MITSUBISHI_EXT:
return "Mitsubishi Extended";
case P_ID_RESERVED:
return "Not Allowed / Reserved for Future Use";
default:
return "Unknown";
}
}
static void print_cfi_ident(struct cfi_ident *cfip)
{
#if 0
if (cfip->qry[0] != 'Q' || cfip->qry[1] != 'R' || cfip->qry[2] != 'Y') {
printk("Invalid CFI ident structure.\n");
return;
}
#endif
printk("Primary Vendor Command Set: %4.4X (%s)\n", cfip->P_ID, vendorname(cfip->P_ID));
if (cfip->P_ADR)
printk("Primary Algorithm Table at %4.4X\n", cfip->P_ADR);
else
printk("No Primary Algorithm Table\n");
printk("Alternative Vendor Command Set: %4.4X (%s)\n", cfip->A_ID, vendorname(cfip->A_ID));
if (cfip->A_ADR)
printk("Alternate Algorithm Table at %4.4X\n", cfip->A_ADR);
else
printk("No Alternate Algorithm Table\n");
printk("Vcc Minimum: %x.%x V\n", cfip->VccMin >> 4, cfip->VccMin & 0xf);
printk("Vcc Maximum: %x.%x V\n", cfip->VccMax >> 4, cfip->VccMax & 0xf);
if (cfip->VppMin) {
printk("Vpp Minimum: %x.%x V\n", cfip->VppMin >> 4, cfip->VppMin & 0xf);
printk("Vpp Maximum: %x.%x V\n", cfip->VppMax >> 4, cfip->VppMax & 0xf);
}
else
printk("No Vpp line\n");
printk("Typical byte/word write timeout: %d µs\n", 1<<cfip->WordWriteTimeoutTyp);
printk("Maximum byte/word write timeout: %d µs\n", (1<<cfip->WordWriteTimeoutMax) * (1<<cfip->WordWriteTimeoutTyp));
if (cfip->BufWriteTimeoutTyp || cfip->BufWriteTimeoutMax) {
printk("Typical full buffer write timeout: %d µs\n", 1<<cfip->BufWriteTimeoutTyp);
printk("Maximum full buffer write timeout: %d µs\n", (1<<cfip->BufWriteTimeoutMax) * (1<<cfip->BufWriteTimeoutTyp));
}
else
printk("Full buffer write not supported\n");
printk("Typical block erase timeout: %d µs\n", 1<<cfip->BlockEraseTimeoutTyp);
printk("Maximum block erase timeout: %d µs\n", (1<<cfip->BlockEraseTimeoutMax) * (1<<cfip->BlockEraseTimeoutTyp));
if (cfip->ChipEraseTimeoutTyp || cfip->ChipEraseTimeoutMax) {
printk("Typical chip erase timeout: %d µs\n", 1<<cfip->ChipEraseTimeoutTyp);
printk("Maximum chip erase timeout: %d µs\n", (1<<cfip->ChipEraseTimeoutMax) * (1<<cfip->ChipEraseTimeoutTyp));
}
else
printk("Chip erase not supported\n");
printk("Device size: 0x%X bytes (%d MiB)\n", 1 << cfip->DevSize, 1<< (cfip->DevSize - 20));
printk("Flash Device Interface description: 0x%4.4X\n", cfip->InterfaceDesc);
switch(cfip->InterfaceDesc) {
case 0:
printk(" - x8-only asynchronous interface\n");
break;
case 1:
printk(" - x16-only asynchronous interface\n");
break;
case 2:
printk(" - supports x8 and x16 via BYTE# with asynchronous interface\n");
break;
case 3:
printk(" - x32-only asynchronous interface\n");
break;
case 65535:
printk(" - Not Allowed / Reserved\n");
break;
default:
printk(" - Unknown\n");
break;
}
printk("Max. bytes in buffer write: 0x%x\n", 1<< cfip->MaxBufWriteSize);
printk("Number of Erase Block Regions: %d\n", cfip->NumEraseRegions);
}
#endif /* DEBUG_CFI */
static struct chip_probe cfi_chip_probe = {
name: "CFI",
probe_chip: cfi_probe_chip
};
struct mtd_info *cfi_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, &cfi_chip_probe);
}
static struct mtd_chip_driver cfi_chipdrv = {
probe: cfi_probe,
name: "cfi_probe",
module: THIS_MODULE
};
int __init cfi_probe_init(void)
{
register_mtd_chip_driver(&cfi_chipdrv);
return 0;
}
static void __exit cfi_probe_exit(void)
{
unregister_mtd_chip_driver(&cfi_chipdrv);
}
module_init(cfi_probe_init);
module_exit(cfi_probe_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org> et al.");
MODULE_DESCRIPTION("Probe code for CFI-compliant flash chips");
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