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sf: Add spi_boot() to allow booting from SPI flash in an SPL 

Signed-off-by: Christian Riesch <christian.riesch@omicron.at>
Cc: Heiko Schocher <hs@denx.de>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Scott Wood <scottwood@freescale.com>
Acked-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Christian Riesch 2011-12-09 09:47:35 +00:00 committed by Albert ARIBAUD
parent 7029a24f2c
commit 32b1127397
4 changed files with 66 additions and 0 deletions
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1
doc/README.SPL
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@ -65,3 +65,4 @@ CONFIG_SPL_NAND_SUPPORT (drivers/mtd/nand/libnand.o)
CONFIG_SPL_DMA_SUPPORT (drivers/dma/libdma.o)
CONFIG_SPL_POST_MEM_SUPPORT (post/drivers/memory.o)
CONFIG_SPL_NAND_LOAD (drivers/mtd/nand/nand_spl_load.o)
CONFIG_SPL_SPI_LOAD (drivers/mtd/spi/spi_spl_load.o)

4
drivers/mtd/spi/Makefile
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@ -25,6 +25,10 @@ include $(TOPDIR)/config.mk
LIB := $(obj)libspi_flash.o
ifdef CONFIG_SPL_BUILD
COBJS-$(CONFIG_SPL_SPI_LOAD) += spi_spl_load.o
endif
COBJS-$(CONFIG_SPI_FLASH) += spi_flash.o
COBJS-$(CONFIG_SPI_FLASH_ATMEL) += atmel.o
COBJS-$(CONFIG_SPI_FLASH_EON) += eon.o

58
drivers/mtd/spi/spi_spl_load.c Normal file
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@ -0,0 +1,58 @@
/*
* Copyright (C) 2011 OMICRON electronics GmbH
*
* based on drivers/mtd/nand/nand_spl_load.c
*
* Copyright (C) 2011
* Heiko Schocher, DENX Software Engineering, hs@denx.de.
*
* 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>
/*
* 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)
{
struct spi_flash *flash;
void (*uboot)(void) __noreturn;
/*
* Load U-Boot image from SPI flash into RAM
*/
flash = spi_flash_probe(CONFIG_SPL_SPI_BUS, CONFIG_SPL_SPI_CS,
CONFIG_SF_DEFAULT_SPEED, SPI_MODE_3);
if (!flash) {
puts("failed.\n");
hang();
}
spi_flash_read(flash, CONFIG_SYS_SPI_U_BOOT_OFFS,
CONFIG_SYS_SPI_U_BOOT_SIZE,
(void *) CONFIG_SYS_TEXT_BASE);
/*
* Jump to U-Boot image
*/
uboot = (void *) CONFIG_SYS_TEXT_BASE;
(*uboot)();
}

3
include/spi_flash.h
View File

@ -25,6 +25,7 @@
#include <spi.h>
#include <linux/types.h>
#include <linux/compiler.h>
struct spi_flash {
struct spi_slave *spi;
@ -68,4 +69,6 @@ static inline int spi_flash_erase(struct spi_flash *flash, u32 offset,
return flash->erase(flash, offset, len);
}
void spi_boot(void) __noreturn;
#endif /* _SPI_FLASH_H_ */