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/*
* Sonics Silicon Backplane
* ChipCommon serial flash interface
*
* Licensed under the GNU/GPL. See COPYING for details.
*/
#include <linux/ssb/ssb.h>
#include "ssb_private.h"
static struct resource ssb_sflash_resource = {
.name = "ssb_sflash",
.start = SSB_FLASH2,
.end = 0,
.flags = IORESOURCE_MEM | IORESOURCE_READONLY,
};
struct platform_device ssb_sflash_dev = {
.name = "ssb_sflash",
.resource = &ssb_sflash_resource,
.num_resources = 1,
};
struct ssb_sflash_tbl_e {
char *name;
u32 id;
u32 blocksize;
u16 numblocks;
};
static const struct ssb_sflash_tbl_e ssb_sflash_st_tbl[] = {
{ "M25P20", 0x11, 0x10000, 4, },
{ "M25P40", 0x12, 0x10000, 8, },
{ "M25P16", 0x14, 0x10000, 32, },
{ "M25P32", 0x15, 0x10000, 64, },
{ "M25P64", 0x16, 0x10000, 128, },
{ "M25FL128", 0x17, 0x10000, 256, },
{ NULL },
};
static const struct ssb_sflash_tbl_e ssb_sflash_sst_tbl[] = {
{ "SST25WF512", 1, 0x1000, 16, },
{ "SST25VF512", 0x48, 0x1000, 16, },
{ "SST25WF010", 2, 0x1000, 32, },
{ "SST25VF010", 0x49, 0x1000, 32, },
{ "SST25WF020", 3, 0x1000, 64, },
{ "SST25VF020", 0x43, 0x1000, 64, },
{ "SST25WF040", 4, 0x1000, 128, },
{ "SST25VF040", 0x44, 0x1000, 128, },
{ "SST25VF040B", 0x8d, 0x1000, 128, },
{ "SST25WF080", 5, 0x1000, 256, },
{ "SST25VF080B", 0x8e, 0x1000, 256, },
{ "SST25VF016", 0x41, 0x1000, 512, },
{ "SST25VF032", 0x4a, 0x1000, 1024, },
{ "SST25VF064", 0x4b, 0x1000, 2048, },
{ NULL },
};
static const struct ssb_sflash_tbl_e ssb_sflash_at_tbl[] = {
{ "AT45DB011", 0xc, 256, 512, },
{ "AT45DB021", 0x14, 256, 1024, },
{ "AT45DB041", 0x1c, 256, 2048, },
{ "AT45DB081", 0x24, 256, 4096, },
{ "AT45DB161", 0x2c, 512, 4096, },
{ "AT45DB321", 0x34, 512, 8192, },
{ "AT45DB642", 0x3c, 1024, 8192, },
{ NULL },
};
static void ssb_sflash_cmd(struct ssb_chipcommon *cc, u32 opcode)
{
int i;
chipco_write32(cc, SSB_CHIPCO_FLASHCTL,
SSB_CHIPCO_FLASHCTL_START | opcode);
for (i = 0; i < 1000; i++) {
if (!(chipco_read32(cc, SSB_CHIPCO_FLASHCTL) &
SSB_CHIPCO_FLASHCTL_BUSY))
return;
cpu_relax();
}
pr_err("SFLASH control command failed (timeout)!\n");
}
/* Initialize serial flash access */
int ssb_sflash_init(struct ssb_chipcommon *cc)
{
struct ssb_sflash *sflash = &cc->dev->bus->mipscore.sflash;
const struct ssb_sflash_tbl_e *e;
u32 id, id2;
switch (cc->capabilities & SSB_CHIPCO_CAP_FLASHT) {
case SSB_CHIPCO_FLASHT_STSER:
ssb_sflash_cmd(cc, SSB_CHIPCO_FLASHCTL_ST_DP);
chipco_write32(cc, SSB_CHIPCO_FLASHADDR, 0);
ssb_sflash_cmd(cc, SSB_CHIPCO_FLASHCTL_ST_RES);
id = chipco_read32(cc, SSB_CHIPCO_FLASHDATA);
chipco_write32(cc, SSB_CHIPCO_FLASHADDR, 1);
ssb_sflash_cmd(cc, SSB_CHIPCO_FLASHCTL_ST_RES);
id2 = chipco_read32(cc, SSB_CHIPCO_FLASHDATA);
switch (id) {
case 0xbf:
for (e = ssb_sflash_sst_tbl; e->name; e++) {
if (e->id == id2)
break;
}
break;
case 0x13:
return -ENOTSUPP;
default:
for (e = ssb_sflash_st_tbl; e->name; e++) {
if (e->id == id)
break;
}
break;
}
if (!e->name) {
pr_err("Unsupported ST serial flash (id: 0x%X, id2: 0x%X)\n",
id, id2);
return -ENOTSUPP;
}
break;
case SSB_CHIPCO_FLASHT_ATSER:
ssb_sflash_cmd(cc, SSB_CHIPCO_FLASHCTL_AT_STATUS);
id = chipco_read32(cc, SSB_CHIPCO_FLASHDATA) & 0x3c;
for (e = ssb_sflash_at_tbl; e->name; e++) {
if (e->id == id)
break;
}
if (!e->name) {
pr_err("Unsupported Atmel serial flash (id: 0x%X)\n",
id);
return -ENOTSUPP;
}
break;
default:
pr_err("Unsupported flash type\n");
return -ENOTSUPP;
}
sflash->window = SSB_FLASH2;
sflash->blocksize = e->blocksize;
sflash->numblocks = e->numblocks;
sflash->size = sflash->blocksize * sflash->numblocks;
sflash->present = true;
pr_info("Found %s serial flash (size: %dKiB, blocksize: 0x%X, blocks: %d)\n",
e->name, sflash->size / 1024, e->blocksize, e->numblocks);
/* Prepare platform device, but don't register it yet. It's too early,
* malloc (required by device_private_init) is not available yet. */
ssb_sflash_dev.resource[0].end = ssb_sflash_dev.resource[0].start +
sflash->size;
ssb_sflash_dev.dev.platform_data = sflash;
return 0;
}