mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-16 01:04:08 +08:00
d57ef3a6a2
Signed-off-by: Rafał Miłecki <zajec5@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
137 lines
3.2 KiB
C
137 lines
3.2 KiB
C
/*
|
|
* Broadcom specific AMBA
|
|
* ChipCommon serial flash interface
|
|
*
|
|
* Licensed under the GNU/GPL. See COPYING for details.
|
|
*/
|
|
|
|
#include <linux/platform_device.h>
|
|
#include <linux/bcma/bcma.h>
|
|
|
|
#include "bcma_private.h"
|
|
|
|
static struct resource bcma_sflash_resource = {
|
|
.name = "bcma_sflash",
|
|
.start = BCMA_SFLASH,
|
|
.end = 0,
|
|
.flags = IORESOURCE_MEM | IORESOURCE_READONLY,
|
|
};
|
|
|
|
struct platform_device bcma_sflash_dev = {
|
|
.name = "bcma_sflash",
|
|
.resource = &bcma_sflash_resource,
|
|
.num_resources = 1,
|
|
};
|
|
|
|
struct bcma_sflash_tbl_e {
|
|
char *name;
|
|
u32 id;
|
|
u32 blocksize;
|
|
u16 numblocks;
|
|
};
|
|
|
|
static struct bcma_sflash_tbl_e bcma_sflash_st_tbl[] = {
|
|
{ "", 0x14, 0x10000, 32, },
|
|
{ 0 },
|
|
};
|
|
|
|
static struct bcma_sflash_tbl_e bcma_sflash_sst_tbl[] = {
|
|
{ 0 },
|
|
};
|
|
|
|
static struct bcma_sflash_tbl_e bcma_sflash_at_tbl[] = {
|
|
{ 0 },
|
|
};
|
|
|
|
static void bcma_sflash_cmd(struct bcma_drv_cc *cc, u32 opcode)
|
|
{
|
|
int i;
|
|
bcma_cc_write32(cc, BCMA_CC_FLASHCTL,
|
|
BCMA_CC_FLASHCTL_START | opcode);
|
|
for (i = 0; i < 1000; i++) {
|
|
if (!(bcma_cc_read32(cc, BCMA_CC_FLASHCTL) &
|
|
BCMA_CC_FLASHCTL_BUSY))
|
|
return;
|
|
cpu_relax();
|
|
}
|
|
bcma_err(cc->core->bus, "SFLASH control command failed (timeout)!\n");
|
|
}
|
|
|
|
/* Initialize serial flash access */
|
|
int bcma_sflash_init(struct bcma_drv_cc *cc)
|
|
{
|
|
struct bcma_bus *bus = cc->core->bus;
|
|
struct bcma_sflash *sflash = &cc->sflash;
|
|
struct bcma_sflash_tbl_e *e;
|
|
u32 id, id2;
|
|
|
|
switch (cc->capabilities & BCMA_CC_CAP_FLASHT) {
|
|
case BCMA_CC_FLASHT_STSER:
|
|
bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_DP);
|
|
|
|
bcma_cc_write32(cc, BCMA_CC_FLASHADDR, 0);
|
|
bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_RES);
|
|
id = bcma_cc_read32(cc, BCMA_CC_FLASHDATA);
|
|
|
|
bcma_cc_write32(cc, BCMA_CC_FLASHADDR, 1);
|
|
bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_RES);
|
|
id2 = bcma_cc_read32(cc, BCMA_CC_FLASHDATA);
|
|
|
|
switch (id) {
|
|
case 0xbf:
|
|
for (e = bcma_sflash_sst_tbl; e->name; e++) {
|
|
if (e->id == id2)
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
for (e = bcma_sflash_st_tbl; e->name; e++) {
|
|
if (e->id == id)
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
if (!e->name) {
|
|
bcma_err(bus, "Unsupported ST serial flash (id: 0x%X, id2: 0x%X)\n", id, id2);
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
break;
|
|
case BCMA_CC_FLASHT_ATSER:
|
|
bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_AT_STATUS);
|
|
id = bcma_cc_read32(cc, BCMA_CC_FLASHDATA) & 0x3c;
|
|
|
|
for (e = bcma_sflash_at_tbl; e->name; e++) {
|
|
if (e->id == id)
|
|
break;
|
|
}
|
|
if (!e->name) {
|
|
bcma_err(bus, "Unsupported Atmel serial flash (id: 0x%X)\n", id);
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
break;
|
|
default:
|
|
bcma_err(bus, "Unsupported flash type\n");
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
sflash->window = BCMA_SFLASH;
|
|
sflash->blocksize = e->blocksize;
|
|
sflash->numblocks = e->numblocks;
|
|
sflash->size = sflash->blocksize * sflash->numblocks;
|
|
sflash->present = true;
|
|
|
|
bcma_info(bus, "Found %s serial flash (size: %dKiB, blocksize: 0x%X, blocks: %d)\n",
|
|
e->name, sflash->size / 1024, sflash->blocksize,
|
|
sflash->numblocks);
|
|
|
|
/* Prepare platform device, but don't register it yet. It's too early,
|
|
* malloc (required by device_private_init) is not available yet. */
|
|
bcma_sflash_dev.resource[0].end = bcma_sflash_dev.resource[0].start +
|
|
sflash->size;
|
|
bcma_sflash_dev.dev.platform_data = sflash;
|
|
|
|
return 0;
|
|
}
|