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sf: Enable FDT-based configuration and memory mapping 

Enable device tree control of SPI flash, and use this to implement
memory-mapped SPI flash, which is supported on Intel chips.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2013-03-11 06:08:08 +00:00
parent 5e6fb69778
commit bb8215f437
4 changed files with 48 additions and 1 deletions
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46
drivers/mtd/spi/spi_flash.c
View File

@ -8,6 +8,7 @@
*/
#include <common.h>
#include <fdtdec.h>
#include <malloc.h>
#include <spi.h>
#include <spi_flash.h>
@ -15,6 +16,8 @@
#include "spi_flash_internal.h"
DECLARE_GLOBAL_DATA_PTR;
static void spi_flash_addr(u32 addr, u8 *cmd)
{
/* cmd[0] is actual command */
@ -146,6 +149,10 @@ int spi_flash_cmd_read_fast(struct spi_flash *flash, u32 offset,
{
u8 cmd[5];
/* Handle memory-mapped SPI */
if (flash->memory_map)
memcpy(data, flash->memory_map + offset, len);
cmd[0] = CMD_READ_ARRAY_FAST;
spi_flash_addr(offset, cmd);
cmd[4] = 0x00;
@ -275,6 +282,34 @@ int spi_flash_cmd_write_status(struct spi_flash *flash, u8 sr)
return 0;
}
#ifdef CONFIG_OF_CONTROL
int spi_flash_decode_fdt(const void *blob, struct spi_flash *flash)
{
fdt_addr_t addr;
fdt_size_t size;
int node;
/* If there is no node, do nothing */
node = fdtdec_next_compatible(blob, 0, COMPAT_GENERIC_SPI_FLASH);
if (node < 0)
return 0;
addr = fdtdec_get_addr_size(blob, node, "memory-map", &size);
if (addr == FDT_ADDR_T_NONE) {
debug("%s: Cannot decode address\n", __func__);
return 0;
}
if (flash->size != size) {
debug("%s: Memory map must cover entire device\n", __func__);
return -1;
}
flash->memory_map = (void *)addr;
return 0;
}
#endif /* CONFIG_OF_CONTROL */
/*
* The following table holds all device probe functions
*
@ -391,9 +426,18 @@ struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
goto err_manufacturer_probe;
}
#ifdef CONFIG_OF_CONTROL
if (spi_flash_decode_fdt(gd->fdt_blob, flash)) {
debug("SF: FDT decode error\n");
goto err_manufacturer_probe;
}
#endif
printf("SF: Detected %s with page size ", flash->name);
print_size(flash->sector_size, ", total ");
print_size(flash->size, "\n");
print_size(flash->size, "");
if (flash->memory_map)
printf(", mapped at %p", flash->memory_map);
puts("\n");
spi_release_bus(spi);

1
include/fdtdec.h
View File

@ -86,6 +86,7 @@ enum fdt_compat_id {
COMPAT_SAMSUNG_EXYNOS_EHCI, /* Exynos EHCI controller */
COMPAT_SAMSUNG_EXYNOS_USB_PHY, /* Exynos phy controller for usb2.0 */
COMPAT_MAXIM_MAX77686_PMIC, /* MAX77686 PMIC */
COMPAT_GENERIC_SPI_FLASH, /* Generic SPI Flash chip */
COMPAT_COUNT,
};

1
include/spi_flash.h
View File

@ -39,6 +39,7 @@ struct spi_flash {
/* Erase (sector) size */
u32 sector_size;
void *memory_map; /* Address of read-only SPI flash access */
int (*read)(struct spi_flash *flash, u32 offset,
size_t len, void *buf);
int (*write)(struct spi_flash *flash, u32 offset,

1
lib/fdtdec.c
View File

@ -59,6 +59,7 @@ static const char * const compat_names[COMPAT_COUNT] = {
COMPAT(SAMSUNG_EXYNOS_EHCI, "samsung,exynos-ehci"),
COMPAT(SAMSUNG_EXYNOS_USB_PHY, "samsung,exynos-usb-phy"),
COMPAT(MAXIM_MAX77686_PMIC, "maxim,max77686_pmic"),
COMPAT(GENERIC_SPI_FLASH, "spi-flash"),
};
const char *fdtdec_get_compatible(enum fdt_compat_id id)