arch/arm/cpu/armv7/sunxi/board.c - manifest_repos/bootloader - Git at Google

 /*
  * (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 <mmc.h>
 #include <i2c.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/spl.h>
 #include <asm/arch/sys_proto.h>
 #include <asm/arch/timer.h>
 #include <asm/arch/tzpc.h>
 #include <asm/arch/mmc.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
 #if defined(CONFIG_MACH_SUN8I)
 	sunxi_gpio_set_cfgpin(SUNXI_GPF(2), SUN8I_GPF_UART0);
 	sunxi_gpio_set_cfgpin(SUNXI_GPF(4), SUN8I_GPF_UART0);
 #else
 	sunxi_gpio_set_cfgpin(SUNXI_GPF(2), SUNXI_GPF_UART0);
 	sunxi_gpio_set_cfgpin(SUNXI_GPF(4), SUNXI_GPF_UART0);
 #endif
 	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_GPB_UART0);
 	sunxi_gpio_set_cfgpin(SUNXI_GPB(23), SUN4I_GPB_UART0);
 	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_GPB_UART0);
 	sunxi_gpio_set_cfgpin(SUNXI_GPB(20), SUN5I_GPB_UART0);
 	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_GPH_UART0);
 	sunxi_gpio_set_cfgpin(SUNXI_GPH(21), SUN6I_GPH_UART0);
 	sunxi_gpio_set_pull(SUNXI_GPH(21), SUNXI_GPIO_PULL_UP);
 #elif CONFIG_CONS_INDEX == 1 && defined(CONFIG_MACH_SUN8I_A33)
 	sunxi_gpio_set_cfgpin(SUNXI_GPB(0), SUN8I_A33_GPB_UART0);
 	sunxi_gpio_set_cfgpin(SUNXI_GPB(1), SUN8I_A33_GPB_UART0);
 	sunxi_gpio_set_pull(SUNXI_GPB(1), SUNXI_GPIO_PULL_UP);
 #elif CONFIG_CONS_INDEX == 1 && defined(CONFIG_MACH_SUN8I_H3)
 	sunxi_gpio_set_cfgpin(SUNXI_GPA(4), SUN8I_H3_GPA_UART0);
 	sunxi_gpio_set_cfgpin(SUNXI_GPA(5), SUN8I_H3_GPA_UART0);
 	sunxi_gpio_set_pull(SUNXI_GPA(5), SUNXI_GPIO_PULL_UP);
 #elif CONFIG_CONS_INDEX == 1 && defined(CONFIG_MACH_SUN8I_A83T)
 	sunxi_gpio_set_cfgpin(SUNXI_GPB(9), SUN8I_A83T_GPB_UART0);
 	sunxi_gpio_set_cfgpin(SUNXI_GPB(10), SUN8I_A83T_GPB_UART0);
 	sunxi_gpio_set_pull(SUNXI_GPB(10), SUNXI_GPIO_PULL_UP);
 #elif CONFIG_CONS_INDEX == 1 && defined(CONFIG_MACH_SUN9I)
 	sunxi_gpio_set_cfgpin(SUNXI_GPH(12), SUN9I_GPH_UART0);
 	sunxi_gpio_set_cfgpin(SUNXI_GPH(13), SUN9I_GPH_UART0);
 	sunxi_gpio_set_pull(SUNXI_GPH(13), SUNXI_GPIO_PULL_UP);
 #elif CONFIG_CONS_INDEX == 2 && defined(CONFIG_MACH_SUN5I)
 	sunxi_gpio_set_cfgpin(SUNXI_GPG(3), SUN5I_GPG_UART1);
 	sunxi_gpio_set_cfgpin(SUNXI_GPG(4), SUN5I_GPG_UART1);
 	sunxi_gpio_set_pull(SUNXI_GPG(4), SUNXI_GPIO_PULL_UP);
 #elif CONFIG_CONS_INDEX == 3 && defined(CONFIG_MACH_SUN8I)
 	sunxi_gpio_set_cfgpin(SUNXI_GPB(0), SUN8I_GPB_UART2);
 	sunxi_gpio_set_cfgpin(SUNXI_GPB(1), SUN8I_GPB_UART2);
 	sunxi_gpio_set_pull(SUNXI_GPB(1), SUNXI_GPIO_PULL_UP);
 #elif CONFIG_CONS_INDEX == 5 && defined(CONFIG_MACH_SUN8I)
 	sunxi_gpio_set_cfgpin(SUNXI_GPL(2), SUN8I_GPL_R_UART);
 	sunxi_gpio_set_cfgpin(SUNXI_GPL(3), SUN8I_GPL_R_UART);
 	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;
 }

 int 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);

 	return 0;
 }

 void s_init(void)
 {
 #if defined CONFIG_MACH_SUN6I || defined CONFIG_MACH_SUN8I_A23
 	/* 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_MACH_SUN6I || \
     defined CONFIG_MACH_SUN7I || \
     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
 #if defined CONFIG_MACH_SUN6I
 	/* Enable non-secure access to the RTC */
 	tzpc_init();
 #endif

 	clock_init();
 	timer_init();
 	gpio_init();
 	i2c_init_board();
 }

 #ifdef CONFIG_SPL_BUILD
 DECLARE_GLOBAL_DATA_PTR;

 /* The sunxi internal brom will try to loader external bootloader
  * from mmc0, nand flash, mmc2.
  */
 u32 spl_boot_device(void)
 {
 	__maybe_unused struct mmc *mmc0, *mmc1;
 	/*
 	 * When booting from the SD card or NAND memory, 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 checks for the signature and if it is not found returns to
 	 * the FEL code in the BROM to wait and receive the main u-boot
 	 * binary over USB. If it is found, it determines where SPL was
 	 * read from.
 	 */
 	if (!is_boot0_magic(SPL_ADDR + 4)) /* eGON.BT0 */
 		return BOOT_DEVICE_BOARD;

 	/* The BROM will try to boot from mmc0 first, so try that first. */
 #ifdef CONFIG_MMC
 	mmc_initialize(gd->bd);
 	mmc0 = find_mmc_device(0);
 	if (sunxi_mmc_has_egon_boot_signature(mmc0))
 		return BOOT_DEVICE_MMC1;
 #endif

 	/* Fallback to booting NAND if enabled. */
 	if (IS_ENABLED(CONFIG_SPL_NAND_SUPPORT))
 		return BOOT_DEVICE_NAND;

 #ifdef CONFIG_MMC
 	if (CONFIG_MMC_SUNXI_SLOT_EXTRA == 2) {
 		mmc1 = find_mmc_device(1);
 		if (sunxi_mmc_has_egon_boot_signature(mmc1))
 			return BOOT_DEVICE_MMC2;
 	}
 #endif

 	panic("Could not determine boot source\n");
 	return -1;		/* Never reached */
 }

 /* No confirmation data available in SPL yet. Hardcode bootmode */
 u32 spl_boot_mode(void)
 {
 	return MMCSD_MODE_RAW;
 }

 void board_init_f(ulong dummy)
 {
 	spl_init();
 	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();
 }
 #endif

 void reset_cpu(ulong addr)
 {
 #ifdef CONFIG_SUNXI_GEN_SUN4I
 	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);
 	}
 #endif
 #ifdef CONFIG_SUNXI_GEN_SUN6I
 	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);
 	while (1) { }
 #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_request(CONFIG_MACPWR, "macpwr");
 	gpio_direction_output(CONFIG_MACPWR, 1);
 	mdelay(200);
 #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
	/*
	* (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 <mmc.h>
	#include <i2c.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/spl.h>
	#include <asm/arch/sys_proto.h>
	#include <asm/arch/timer.h>
	#include <asm/arch/tzpc.h>
	#include <asm/arch/mmc.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
	#if defined(CONFIG_MACH_SUN8I)
	sunxi_gpio_set_cfgpin(SUNXI_GPF(2), SUN8I_GPF_UART0);
	sunxi_gpio_set_cfgpin(SUNXI_GPF(4), SUN8I_GPF_UART0);
	#else
	sunxi_gpio_set_cfgpin(SUNXI_GPF(2), SUNXI_GPF_UART0);
	sunxi_gpio_set_cfgpin(SUNXI_GPF(4), SUNXI_GPF_UART0);
	#endif
	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_GPB_UART0);
	sunxi_gpio_set_cfgpin(SUNXI_GPB(23), SUN4I_GPB_UART0);
	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_GPB_UART0);
	sunxi_gpio_set_cfgpin(SUNXI_GPB(20), SUN5I_GPB_UART0);
	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_GPH_UART0);
	sunxi_gpio_set_cfgpin(SUNXI_GPH(21), SUN6I_GPH_UART0);
	sunxi_gpio_set_pull(SUNXI_GPH(21), SUNXI_GPIO_PULL_UP);
	#elif CONFIG_CONS_INDEX == 1 && defined(CONFIG_MACH_SUN8I_A33)
	sunxi_gpio_set_cfgpin(SUNXI_GPB(0), SUN8I_A33_GPB_UART0);
	sunxi_gpio_set_cfgpin(SUNXI_GPB(1), SUN8I_A33_GPB_UART0);
	sunxi_gpio_set_pull(SUNXI_GPB(1), SUNXI_GPIO_PULL_UP);
	#elif CONFIG_CONS_INDEX == 1 && defined(CONFIG_MACH_SUN8I_H3)
	sunxi_gpio_set_cfgpin(SUNXI_GPA(4), SUN8I_H3_GPA_UART0);
	sunxi_gpio_set_cfgpin(SUNXI_GPA(5), SUN8I_H3_GPA_UART0);
	sunxi_gpio_set_pull(SUNXI_GPA(5), SUNXI_GPIO_PULL_UP);
	#elif CONFIG_CONS_INDEX == 1 && defined(CONFIG_MACH_SUN8I_A83T)
	sunxi_gpio_set_cfgpin(SUNXI_GPB(9), SUN8I_A83T_GPB_UART0);
	sunxi_gpio_set_cfgpin(SUNXI_GPB(10), SUN8I_A83T_GPB_UART0);
	sunxi_gpio_set_pull(SUNXI_GPB(10), SUNXI_GPIO_PULL_UP);
	#elif CONFIG_CONS_INDEX == 1 && defined(CONFIG_MACH_SUN9I)
	sunxi_gpio_set_cfgpin(SUNXI_GPH(12), SUN9I_GPH_UART0);
	sunxi_gpio_set_cfgpin(SUNXI_GPH(13), SUN9I_GPH_UART0);
	sunxi_gpio_set_pull(SUNXI_GPH(13), SUNXI_GPIO_PULL_UP);
	#elif CONFIG_CONS_INDEX == 2 && defined(CONFIG_MACH_SUN5I)
	sunxi_gpio_set_cfgpin(SUNXI_GPG(3), SUN5I_GPG_UART1);
	sunxi_gpio_set_cfgpin(SUNXI_GPG(4), SUN5I_GPG_UART1);
	sunxi_gpio_set_pull(SUNXI_GPG(4), SUNXI_GPIO_PULL_UP);
	#elif CONFIG_CONS_INDEX == 3 && defined(CONFIG_MACH_SUN8I)
	sunxi_gpio_set_cfgpin(SUNXI_GPB(0), SUN8I_GPB_UART2);
	sunxi_gpio_set_cfgpin(SUNXI_GPB(1), SUN8I_GPB_UART2);
	sunxi_gpio_set_pull(SUNXI_GPB(1), SUNXI_GPIO_PULL_UP);
	#elif CONFIG_CONS_INDEX == 5 && defined(CONFIG_MACH_SUN8I)
	sunxi_gpio_set_cfgpin(SUNXI_GPL(2), SUN8I_GPL_R_UART);
	sunxi_gpio_set_cfgpin(SUNXI_GPL(3), SUN8I_GPL_R_UART);
	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;
	}

	int 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);

	return 0;
	}

	void s_init(void)
	{
	#if defined CONFIG_MACH_SUN6I \|\| defined CONFIG_MACH_SUN8I_A23
	/* 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_MACH_SUN6I \|\| \
	defined CONFIG_MACH_SUN7I \|\| \
	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
	#if defined CONFIG_MACH_SUN6I
	/* Enable non-secure access to the RTC */
	tzpc_init();
	#endif

	clock_init();
	timer_init();
	gpio_init();
	i2c_init_board();
	}

	#ifdef CONFIG_SPL_BUILD
	DECLARE_GLOBAL_DATA_PTR;

	/* The sunxi internal brom will try to loader external bootloader
	* from mmc0, nand flash, mmc2.
	*/
	u32 spl_boot_device(void)
	{
	__maybe_unused struct mmc mmc0, mmc1;
	/*
	* When booting from the SD card or NAND memory, 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 checks for the signature and if it is not found returns to
	* the FEL code in the BROM to wait and receive the main u-boot
	* binary over USB. If it is found, it determines where SPL was
	* read from.
	*/
	if (!is_boot0_magic(SPL_ADDR + 4)) /* eGON.BT0 */
	return BOOT_DEVICE_BOARD;

	/* The BROM will try to boot from mmc0 first, so try that first. */
	#ifdef CONFIG_MMC
	mmc_initialize(gd->bd);
	mmc0 = find_mmc_device(0);
	if (sunxi_mmc_has_egon_boot_signature(mmc0))
	return BOOT_DEVICE_MMC1;
	#endif

	/* Fallback to booting NAND if enabled. */
	if (IS_ENABLED(CONFIG_SPL_NAND_SUPPORT))
	return BOOT_DEVICE_NAND;

	#ifdef CONFIG_MMC
	if (CONFIG_MMC_SUNXI_SLOT_EXTRA == 2) {
	mmc1 = find_mmc_device(1);
	if (sunxi_mmc_has_egon_boot_signature(mmc1))
	return BOOT_DEVICE_MMC2;
	}
	#endif

	panic("Could not determine boot source\n");
	return -1; /* Never reached */
	}

	/* No confirmation data available in SPL yet. Hardcode bootmode */
	u32 spl_boot_mode(void)
	{
	return MMCSD_MODE_RAW;
	}

	void board_init_f(ulong dummy)
	{
	spl_init();
	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();
	}
	#endif

	void reset_cpu(ulong addr)
	{
	#ifdef CONFIG_SUNXI_GEN_SUN4I
	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);
	}
	#endif
	#ifdef CONFIG_SUNXI_GEN_SUN6I
	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);
	while (1) { }
	#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_request(CONFIG_MACPWR, "macpwr");
	gpio_direction_output(CONFIG_MACPWR, 1);
	mdelay(200);
	#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