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path: root/drivers/mtd/spi/fsl_espi_spl.c
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Diffstat (limited to 'drivers/mtd/spi/fsl_espi_spl.c')
-rw-r--r--drivers/mtd/spi/fsl_espi_spl.c77
1 files changed, 77 insertions, 0 deletions
diff --git a/drivers/mtd/spi/fsl_espi_spl.c b/drivers/mtd/spi/fsl_espi_spl.c
new file mode 100644
index 0000000..9e216a6
--- /dev/null
+++ b/drivers/mtd/spi/fsl_espi_spl.c
@@ -0,0 +1,77 @@
+/*
+ * Copyright 2013 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ */
+
+#include <common.h>
+#include <spi_flash.h>
+#include <malloc.h>
+
+#define ESPI_BOOT_IMAGE_SIZE 0x48
+#define ESPI_BOOT_IMAGE_ADDR 0x50
+#define CONFIG_CFG_DATA_SECTOR 0
+
+/*
+ * The main entry for SPI booting. It's necessary that SDRAM is already
+ * configured and available since this code loads the main U-Boot image
+ * from SPI into SDRAM and starts it from there.
+ */
+void spi_boot(void)
+{
+ void (*uboot)(void) __noreturn;
+ u32 offset, code_len;
+ unsigned char *buf = NULL;
+ struct spi_flash *flash;
+
+ flash = spi_flash_probe(CONFIG_ENV_SPI_BUS, CONFIG_ENV_SPI_CS,
+ CONFIG_ENV_SPI_MAX_HZ, CONFIG_ENV_SPI_MODE);
+ if (flash == NULL) {
+ puts("\nspi_flash_probe failed");
+ hang();
+ }
+
+ /*
+ * Load U-Boot image from SPI flash into RAM
+ */
+ buf = malloc(flash->page_size);
+ if (buf == NULL) {
+ puts("\nmalloc failed");
+ hang();
+ }
+ memset(buf, 0, flash->page_size);
+
+ spi_flash_read(flash, CONFIG_CFG_DATA_SECTOR,
+ flash->page_size, (void *)buf);
+ offset = *(u32 *)(buf + ESPI_BOOT_IMAGE_ADDR);
+ /* Skip spl code */
+ offset += CONFIG_SYS_SPI_FLASH_U_BOOT_OFFS;
+ /* Get the code size from offset 0x48 */
+ code_len = *(u32 *)(buf + ESPI_BOOT_IMAGE_SIZE);
+ /* Skip spl code */
+ code_len = code_len - CONFIG_SPL_MAX_SIZE;
+ /* copy code to DDR */
+ spi_flash_read(flash, offset, code_len,
+ (void *)CONFIG_SYS_SPI_FLASH_U_BOOT_DST);
+ /*
+ * Jump to U-Boot image
+ */
+ flush_cache(CONFIG_SYS_SPI_FLASH_U_BOOT_DST, code_len);
+ uboot = (void *)CONFIG_SYS_SPI_FLASH_U_BOOT_START;
+ (*uboot)();
+}