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u-boot/arch/arm/cpu/armv7/sunxi/board.c
Siarhei Siamashka 840fe95c3b sunxi: Support the FEL boot mode in the regular u-boot build 
So that the CONFIG_SPL_FEL option is not needed anymore. And the regular
SPL binary, generated by the default u-boot build, is now also bootable
over USB in the FEL mode. The SPL still can boot from the SD card too.

A bunch of system registers need to be saved/restored in order to ensure
that the IRQ handler still works in the BROM FEL code after getting
control back from the SPL. This is done in the sunxi code instead of
abusing ifdefs in 'start.S'.

The decision whether to load the main u-boot binary from the SD card or
return to the FEL code in the BROM is done at runtime.

Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>
[hdegoede@redhat.com: Since we now restore various regs before returning to
 the FEL BROM code we can drop the sunxi specific #ifdefs in start.S]
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
2015-02-16 20:23:52 +01:00

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/*
* (C) Copyright 2012 Henrik Nordstrom <henrik@henriknordstrom.net>
*
* (C) Copyright 2007-2011
* Allwinner Technology Co., Ltd. <www.allwinnertech.com>
* Tom Cubie <tangliang@allwinnertech.com>
*
* Some init for sunxi platform.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <i2c.h>
#include <netdev.h>
#include <miiphy.h>
#include <serial.h>
#ifdef CONFIG_SPL_BUILD
#include <spl.h>
#endif
#include <asm/gpio.h>
#include <asm/io.h>
#include <asm/arch/clock.h>
#include <asm/arch/gpio.h>
#include <asm/arch/sys_proto.h>
#include <asm/arch/timer.h>
#include <linux/compiler.h>
struct fel_stash {
uint32_t sp;
uint32_t lr;
uint32_t cpsr;
uint32_t sctlr;
uint32_t vbar;
uint32_t cr;
};
struct fel_stash fel_stash __attribute__((section(".data")));
static int gpio_init(void)
{
#if CONFIG_CONS_INDEX == 1 && defined(CONFIG_UART0_PORT_F)
#if defined(CONFIG_MACH_SUN4I) || defined(CONFIG_MACH_SUN7I)
/* disable GPB22,23 as uart0 tx,rx to avoid conflict */
sunxi_gpio_set_cfgpin(SUNXI_GPB(22), SUNXI_GPIO_INPUT);
sunxi_gpio_set_cfgpin(SUNXI_GPB(23), SUNXI_GPIO_INPUT);
#endif
sunxi_gpio_set_cfgpin(SUNXI_GPF(2), SUNXI_GPF2_UART0_TX);
sunxi_gpio_set_cfgpin(SUNXI_GPF(4), SUNXI_GPF4_UART0_RX);
sunxi_gpio_set_pull(SUNXI_GPF(4), 1);
#elif CONFIG_CONS_INDEX == 1 && (defined(CONFIG_MACH_SUN4I) || defined(CONFIG_MACH_SUN7I))
sunxi_gpio_set_cfgpin(SUNXI_GPB(22), SUN4I_GPB22_UART0_TX);
sunxi_gpio_set_cfgpin(SUNXI_GPB(23), SUN4I_GPB23_UART0_RX);
sunxi_gpio_set_pull(SUNXI_GPB(23), SUNXI_GPIO_PULL_UP);
#elif CONFIG_CONS_INDEX == 1 && defined(CONFIG_MACH_SUN5I)
sunxi_gpio_set_cfgpin(SUNXI_GPB(19), SUN5I_GPB19_UART0_TX);
sunxi_gpio_set_cfgpin(SUNXI_GPB(20), SUN5I_GPB20_UART0_RX);
sunxi_gpio_set_pull(SUNXI_GPB(20), SUNXI_GPIO_PULL_UP);
#elif CONFIG_CONS_INDEX == 1 && defined(CONFIG_MACH_SUN6I)
sunxi_gpio_set_cfgpin(SUNXI_GPH(20), SUN6I_GPH20_UART0_TX);
sunxi_gpio_set_cfgpin(SUNXI_GPH(21), SUN6I_GPH21_UART0_RX);
sunxi_gpio_set_pull(SUNXI_GPH(21), SUNXI_GPIO_PULL_UP);
#elif CONFIG_CONS_INDEX == 2 && defined(CONFIG_MACH_SUN5I)
sunxi_gpio_set_cfgpin(SUNXI_GPG(3), SUN5I_GPG3_UART1_TX);
sunxi_gpio_set_cfgpin(SUNXI_GPG(4), SUN5I_GPG4_UART1_RX);
sunxi_gpio_set_pull(SUNXI_GPG(4), SUNXI_GPIO_PULL_UP);
#elif CONFIG_CONS_INDEX == 5 && defined(CONFIG_MACH_SUN8I)
sunxi_gpio_set_cfgpin(SUNXI_GPL(2), SUN8I_GPL2_R_UART_TX);
sunxi_gpio_set_cfgpin(SUNXI_GPL(3), SUN8I_GPL3_R_UART_RX);
sunxi_gpio_set_pull(SUNXI_GPL(3), SUNXI_GPIO_PULL_UP);
#else
#error Unsupported console port number. Please fix pin mux settings in board.c
#endif
return 0;
}
void spl_board_load_image(void)
{
debug("Returning to FEL sp=%x, lr=%x\n", fel_stash.sp, fel_stash.lr);
return_to_fel(fel_stash.sp, fel_stash.lr);
}
void s_init(void)
{
#if defined CONFIG_MACH_SUN6I || defined CONFIG_MACH_SUN8I
/* Magic (undocmented) value taken from boot0, without this DRAM
* access gets messed up (seems cache related) */
setbits_le32(SUNXI_SRAMC_BASE + 0x44, 0x1800);
#endif
#if !defined CONFIG_SPL_BUILD && (defined CONFIG_MACH_SUN7I || \
defined CONFIG_MACH_SUN6I || defined CONFIG_MACH_SUN8I)
/* Enable SMP mode for CPU0, by setting bit 6 of Auxiliary Ctl reg */
asm volatile(
"mrc p15, 0, r0, c1, c0, 1\n"
"orr r0, r0, #1 << 6\n"
"mcr p15, 0, r0, c1, c0, 1\n");
#endif
clock_init();
timer_init();
gpio_init();
i2c_init_board();
}
#ifdef CONFIG_SPL_BUILD
/* The sunxi internal brom will try to loader external bootloader
* from mmc0, nand flash, mmc2.
* Unfortunately we can't check how SPL was loaded so assume
* it's always the first SD/MMC controller
*/
u32 spl_boot_device(void)
{
#ifdef CONFIG_SPL_FEL
/*
* This is the legacy compile time configuration for a special FEL
* enabled build. It has many restrictions and can only boot over USB.
*/
return BOOT_DEVICE_BOARD;
#else
/*
* When booting from the SD card, the "eGON.BT0" signature is expected
* to be found in memory at the address 0x0004 (see the "mksunxiboot"
* tool, which generates this header).
*
* When booting in the FEL mode over USB, this signature is patched in
* memory and replaced with something else by the 'fel' tool. This other
* signature is selected in such a way, that it can't be present in a
* valid bootable SD card image (because the BROM would refuse to
* execute the SPL in this case).
*
* This branch is just making a decision at runtime whether to load
* the main u-boot binary from the SD card (if the "eGON.BT0" signature
* is found) or return to the FEL code in the BROM to wait and receive
* the main u-boot binary over USB.
*/
if (readl(4) == 0x4E4F4765 && readl(8) == 0x3054422E) /* eGON.BT0 */
return BOOT_DEVICE_MMC1;
else
return BOOT_DEVICE_BOARD;
#endif
}
/* No confirmation data available in SPL yet. Hardcode bootmode */
u32 spl_boot_mode(void)
{
return MMCSD_MODE_RAW;
}
void board_init_f(ulong dummy)
{
preloader_console_init();
#ifdef CONFIG_SPL_I2C_SUPPORT
/* Needed early by sunxi_board_init if PMU is enabled */
i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
#endif
sunxi_board_init();
/* Clear the BSS. */
memset(__bss_start, 0, __bss_end - __bss_start);
board_init_r(NULL, 0);
}
#endif
void reset_cpu(ulong addr)
{
#if defined(CONFIG_MACH_SUN4I) || defined(CONFIG_MACH_SUN5I) || defined(CONFIG_MACH_SUN7I)
static const struct sunxi_wdog *wdog =
&((struct sunxi_timer_reg *)SUNXI_TIMER_BASE)->wdog;
/* Set the watchdog for its shortest interval (.5s) and wait */
writel(WDT_MODE_RESET_EN | WDT_MODE_EN, &wdog->mode);
writel(WDT_CTRL_KEY | WDT_CTRL_RESTART, &wdog->ctl);
while (1) {
/* sun5i sometimes gets stuck without this */
writel(WDT_MODE_RESET_EN | WDT_MODE_EN, &wdog->mode);
}
#else /* CONFIG_MACH_SUN6I || CONFIG_MACH_SUN8I || .. */
static const struct sunxi_wdog *wdog =
((struct sunxi_timer_reg *)SUNXI_TIMER_BASE)->wdog;
/* Set the watchdog for its shortest interval (.5s) and wait */
writel(WDT_CFG_RESET, &wdog->cfg);
writel(WDT_MODE_EN, &wdog->mode);
writel(WDT_CTRL_KEY | WDT_CTRL_RESTART, &wdog->ctl);
#endif
}
#ifndef CONFIG_SYS_DCACHE_OFF
void enable_caches(void)
{
/* Enable D-cache. I-cache is already enabled in start.S */
dcache_enable();
}
#endif
#ifdef CONFIG_CMD_NET
/*
* Initializes on-chip ethernet controllers.
* to override, implement board_eth_init()
*/
int cpu_eth_init(bd_t *bis)
{
__maybe_unused int rc;
#ifdef CONFIG_MACPWR
gpio_direction_output(CONFIG_MACPWR, 1);
mdelay(200);
#endif
#ifdef CONFIG_SUNXI_EMAC
rc = sunxi_emac_initialize(bis);
if (rc < 0) {
printf("sunxi: failed to initialize emac\n");
return rc;
}
#endif
#ifdef CONFIG_SUNXI_GMAC
rc = sunxi_gmac_initialize(bis);
if (rc < 0) {
printf("sunxi: failed to initialize gmac\n");
return rc;
}
#endif
return 0;
}
#endif
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