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/*
* (C) Copyright 2000-2009
* Vipin Kumar, ST Microelectronics, vipin.kumar@st.com
*
* Copyright (C) 2012 Stefan Roese <sr@denx.de>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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 <image.h>
#include <linux/compiler.h>
#include <asm/io.h>
#include <asm/arch/spr_defs.h>
#include <linux/mtd/st_smi.h>
static const char kernel_name[] = "Linux";
static const char loader_name[] = "U-Boot";
int image_check_header(image_header_t *hdr, const char *name)
{
if (image_check_magic(hdr) &&
(!strncmp(image_get_name(hdr), name, strlen(name))) &&
image_check_hcrc(hdr)) {
return 1;
}
return 0;
}
int image_check_data(image_header_t *hdr)
{
if (image_check_dcrc(hdr))
return 1;
return 0;
}
/*
* SNOR (Serial NOR flash) related functions
*/
void snor_init(void)
{
struct smi_regs *const smicntl =
(struct smi_regs * const)CONFIG_SYS_SMI_BASE;
/* Setting the fast mode values. SMI working at 166/4 = 41.5 MHz */
writel(HOLD1 | FAST_MODE | BANK_EN | DSEL_TIME | PRESCAL4,
&smicntl->smi_cr1);
}
static int snor_image_load(u8 *load_addr, void (**image_p)(void),
const char *image_name)
{
image_header_t *header;
/*
* Since calculating the crc in the SNOR flash does not
* work, we copy the image to the destination address
* minus the header size. And point the header to this
* new destination. This will not work for address 0
* of course.
*/
header = (image_header_t *)load_addr;
memcpy((ulong *)(image_get_load(header) - sizeof(image_header_t)),
(const ulong *)load_addr,
image_get_data_size(header) + sizeof(image_header_t));
header = (image_header_t *)(image_get_load(header) -
sizeof(image_header_t));
if (image_check_header(header, image_name)) {
if (image_check_data(header)) {
/* Jump to boot image */
*image_p = (void *)image_get_load(header);
return 1;
}
}
return 0;
}
static void boot_image(void (*image)(void))
{
void (*funcp)(void) __noreturn = (void *)image;
(*funcp)();
}
/*
* spl_boot:
*
* All supported booting types of all supported SoCs are listed here.
* Generic readback APIs are provided for each supported booting type
* eg. nand_read_skip_bad
*/
u32 spl_boot(void)
{
void (*image)(void);
#ifdef CONFIG_SPEAR_USBTTY
plat_late_init();
return 1;
#endif
/*
* All the supported booting devices are listed here. Each of
* the booting type supported by the platform would define the
* macro xxx_BOOT_SUPPORTED to true.
*/
if (SNOR_BOOT_SUPPORTED && snor_boot_selected()) {
/* SNOR-SMI initialization */
snor_init();
serial_puts("Booting via SNOR\n");
/* Serial NOR booting */
if (1 == snor_image_load((u8 *)CONFIG_SYS_UBOOT_BASE,
&image, loader_name)) {
/* Platform related late initialasations */
plat_late_init();
/* Jump to boot image */
serial_puts("Jumping to U-Boot\n");
boot_image(image);
return 1;
}
}
if (NAND_BOOT_SUPPORTED && nand_boot_selected()) {
/* NAND booting */
/* Not ported from XLoader to SPL yet */
return 0;
}
if (PNOR_BOOT_SUPPORTED && pnor_boot_selected()) {
/* PNOR booting */
/* Not ported from XLoader to SPL yet */
return 0;
}
if (MMC_BOOT_SUPPORTED && mmc_boot_selected()) {
/* MMC booting */
/* Not ported from XLoader to SPL yet */
return 0;
}
if (SPI_BOOT_SUPPORTED && spi_boot_selected()) {
/* SPI booting */
/* Not supported for any platform as of now */
return 0;
}
if (I2C_BOOT_SUPPORTED && i2c_boot_selected()) {
/* I2C booting */
/* Not supported for any platform as of now */
return 0;
}
/*
* All booting types without memory are listed as below
* Control has to be returned to BootROM in case of all
* the following booting scenarios
*/
if (USB_BOOT_SUPPORTED && usb_boot_selected()) {
plat_late_init();
return 1;
}
if (TFTP_BOOT_SUPPORTED && tftp_boot_selected()) {
plat_late_init();
return 1;
}
if (UART_BOOT_SUPPORTED && uart_boot_selected()) {
plat_late_init();
return 1;
}
/* Ideally, the control should not reach here. */
hang();
}
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