Commit cbf77c1b authored by Atsushi Nemoto's avatar Atsushi Nemoto Committed by David Woodhouse

[MTD] RBTX4939: add MTD support

Add platform support for NOR flash chips on RBTX4939 board.
This board has complex flash mappings, controlled by its DIPSW setting.

[akpm@linux-foundation.org: Use min_t]
Signed-off-by: default avatarAtsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: Ralf Bächle <ralf@linux-mips.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
parent a591f5d3
......@@ -130,4 +130,13 @@
void rbtx4939_prom_init(void);
void rbtx4939_irq_setup(void);
struct mtd_partition;
struct map_info;
struct rbtx4939_flash_data {
unsigned int width;
unsigned int nr_parts;
struct mtd_partition *parts;
void (*map_init)(struct map_info *map);
};
#endif /* __ASM_TXX9_RBTX4939_H */
......@@ -16,6 +16,9 @@
#include <linux/leds.h>
#include <linux/interrupt.h>
#include <linux/smc91x.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/map.h>
#include <asm/reboot.h>
#include <asm/txx9/generic.h>
#include <asm/txx9/pci.h>
......@@ -282,6 +285,159 @@ static void rbtx4939_7segled_putc(unsigned int pos, unsigned char val)
__rbtx4939_7segled_putc(pos, val);
}
#if defined(CONFIG_MTD_RBTX4939) || defined(CONFIG_MTD_RBTX4939_MODULE)
/* special mapping for boot rom */
static unsigned long rbtx4939_flash_fixup_ofs(unsigned long ofs)
{
u8 bdipsw = readb(rbtx4939_bdipsw_addr) & 0x0f;
unsigned char shift;
if (bdipsw & 8) {
/* BOOT Mode: USER ROM1 / USER ROM2 */
shift = bdipsw & 3;
/* rotate A[23:22] */
return (ofs & ~0xc00000) | ((((ofs >> 22) + shift) & 3) << 22);
}
#ifdef __BIG_ENDIAN
if (bdipsw == 0)
/* BOOT Mode: Monitor ROM */
ofs ^= 0x400000; /* swap A[22] */
#endif
return ofs;
}
static map_word rbtx4939_flash_read16(struct map_info *map, unsigned long ofs)
{
map_word r;
ofs = rbtx4939_flash_fixup_ofs(ofs);
r.x[0] = __raw_readw(map->virt + ofs);
return r;
}
static void rbtx4939_flash_write16(struct map_info *map, const map_word datum,
unsigned long ofs)
{
ofs = rbtx4939_flash_fixup_ofs(ofs);
__raw_writew(datum.x[0], map->virt + ofs);
mb(); /* see inline_map_write() in mtd/map.h */
}
static void rbtx4939_flash_copy_from(struct map_info *map, void *to,
unsigned long from, ssize_t len)
{
u8 bdipsw = readb(rbtx4939_bdipsw_addr) & 0x0f;
unsigned char shift;
ssize_t curlen;
from += (unsigned long)map->virt;
if (bdipsw & 8) {
/* BOOT Mode: USER ROM1 / USER ROM2 */
shift = bdipsw & 3;
while (len) {
curlen = min_t(unsigned long, len,
0x400000 - (from & (0x400000 - 1)));
memcpy(to,
(void *)((from & ~0xc00000) |
((((from >> 22) + shift) & 3) << 22)),
curlen);
len -= curlen;
from += curlen;
to += curlen;
}
return;
}
#ifdef __BIG_ENDIAN
if (bdipsw == 0) {
/* BOOT Mode: Monitor ROM */
while (len) {
curlen = min_t(unsigned long, len,
0x400000 - (from & (0x400000 - 1)));
memcpy(to, (void *)(from ^ 0x400000), curlen);
len -= curlen;
from += curlen;
to += curlen;
}
return;
}
#endif
memcpy(to, (void *)from, len);
}
static void rbtx4939_flash_map_init(struct map_info *map)
{
map->read = rbtx4939_flash_read16;
map->write = rbtx4939_flash_write16;
map->copy_from = rbtx4939_flash_copy_from;
}
static void __init rbtx4939_mtd_init(void)
{
static struct {
struct platform_device dev;
struct resource res;
struct rbtx4939_flash_data data;
} pdevs[4];
int i;
static char names[4][8];
static struct mtd_partition parts[4];
struct rbtx4939_flash_data *boot_pdata = &pdevs[0].data;
u8 bdipsw = readb(rbtx4939_bdipsw_addr) & 0x0f;
if (bdipsw & 8) {
/* BOOT Mode: USER ROM1 / USER ROM2 */
boot_pdata->nr_parts = 4;
for (i = 0; i < boot_pdata->nr_parts; i++) {
sprintf(names[i], "img%d", 4 - i);
parts[i].name = names[i];
parts[i].size = 0x400000;
parts[i].offset = MTDPART_OFS_NXTBLK;
}
} else if (bdipsw == 0) {
/* BOOT Mode: Monitor ROM */
boot_pdata->nr_parts = 2;
strcpy(names[0], "big");
strcpy(names[1], "little");
for (i = 0; i < boot_pdata->nr_parts; i++) {
parts[i].name = names[i];
parts[i].size = 0x400000;
parts[i].offset = MTDPART_OFS_NXTBLK;
}
} else {
/* BOOT Mode: ROM Emulator */
boot_pdata->nr_parts = 2;
parts[0].name = "boot";
parts[0].offset = 0xc00000;
parts[0].size = 0x400000;
parts[1].name = "user";
parts[1].offset = 0;
parts[1].size = 0xc00000;
}
boot_pdata->parts = parts;
boot_pdata->map_init = rbtx4939_flash_map_init;
for (i = 0; i < ARRAY_SIZE(pdevs); i++) {
struct resource *r = &pdevs[i].res;
struct platform_device *dev = &pdevs[i].dev;
r->start = 0x1f000000 - i * 0x1000000;
r->end = r->start + 0x1000000 - 1;
r->flags = IORESOURCE_MEM;
pdevs[i].data.width = 2;
dev->num_resources = 1;
dev->resource = r;
dev->id = i;
dev->name = "rbtx4939-flash";
dev->dev.platform_data = &pdevs[i].data;
platform_device_register(dev);
}
}
#else
static void __init rbtx4939_mtd_init(void)
{
}
#endif
static void __init rbtx4939_arch_init(void)
{
rbtx4939_pci_setup();
......@@ -333,6 +489,7 @@ static void __init rbtx4939_device_init(void)
platform_device_add_data(pdev, &smc_pdata, sizeof(smc_pdata)) ||
platform_device_add(pdev))
platform_device_put(pdev);
rbtx4939_mtd_init();
/* TC58DVM82A1FT: tDH=10ns, tWP=tRP=tREADID=35ns */
tx4939_ndfmc_init(10, 35,
(1 << 1) | (1 << 2),
......
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