sf: Enable FDT-based configuration and memory mapping

[karo-tx-uboot.git] / drivers / mtd / spi / spi_flash.c

diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c
index b82011d0fd2833301cc4b5df12ce0b1e4edd49e7..111185af17586900b7ff447ead1e0ea9d131ecc4 100644 (file)
--- a/drivers/mtd/spi/spi_flash.c
+++ b/drivers/mtd/spi/spi_flash.c
@@ -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);