arch/arm/cpu/armv7/omap3/board.c - filogic/uboot - Gitiles

 /*
  *
  * Common board functions for OMAP3 based boards.
  *
  * (C) Copyright 2004-2008
  * Texas Instruments, <www.ti.com>
  *
  * Author :
  *      Sunil Kumar <sunilsaini05@gmail.com>
  *      Shashi Ranjan <shashiranjanmca05@gmail.com>
  *
  * Derived from Beagle Board and 3430 SDP code by
  *      Richard Woodruff <r-woodruff2@ti.com>
  *      Syed Mohammed Khasim <khasim@ti.com>
  *
  *
  * 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 <spl.h>
 #include <asm/io.h>
 #include <asm/arch/sys_proto.h>
 #include <asm/arch/mem.h>
 #include <asm/cache.h>
 #include <asm/armv7.h>
 #include <asm/arch/gpio.h>
 #include <asm/omap_common.h>
 #include <asm/arch/mmc_host_def.h>
 #include <i2c.h>
 #include <linux/compiler.h>

 DECLARE_GLOBAL_DATA_PTR;

 /* Declarations */
 extern omap3_sysinfo sysinfo;
 static void omap3_setup_aux_cr(void);
 #ifndef CONFIG_SYS_L2CACHE_OFF
 static void omap3_invalidate_l2_cache_secure(void);
 #endif

 static const struct gpio_bank gpio_bank_34xx[6] = {
 	{ (void *)OMAP34XX_GPIO1_BASE, METHOD_GPIO_24XX },
 	{ (void *)OMAP34XX_GPIO2_BASE, METHOD_GPIO_24XX },
 	{ (void *)OMAP34XX_GPIO3_BASE, METHOD_GPIO_24XX },
 	{ (void *)OMAP34XX_GPIO4_BASE, METHOD_GPIO_24XX },
 	{ (void *)OMAP34XX_GPIO5_BASE, METHOD_GPIO_24XX },
 	{ (void *)OMAP34XX_GPIO6_BASE, METHOD_GPIO_24XX },
 };

 const struct gpio_bank *const omap_gpio_bank = gpio_bank_34xx;

 #ifdef CONFIG_SPL_BUILD
 /*
 * We use static variables because global data is not ready yet.
 * Initialized data is available in SPL right from the beginning.
 * We would not typically need to save these parameters in regular
 * U-Boot. This is needed only in SPL at the moment.
 */
 u32 omap3_boot_device = BOOT_DEVICE_NAND;

 /* auto boot mode detection is not possible for OMAP3 - hard code */
 u32 spl_boot_mode(void)
 {
 	switch (spl_boot_device()) {
 	case BOOT_DEVICE_MMC2:
 		return MMCSD_MODE_RAW;
 	case BOOT_DEVICE_MMC1:
 		return MMCSD_MODE_FAT;
 		break;
 	default:
 		puts("spl: ERROR:  unknown device - can't select boot mode\n");
 		hang();
 	}
 }

 u32 spl_boot_device(void)
 {
 	return omap3_boot_device;
 }

 int board_mmc_init(bd_t *bis)
 {
 	switch (spl_boot_device()) {
 	case BOOT_DEVICE_MMC1:
 		omap_mmc_init(0, 0, 0);
 		break;
 	case BOOT_DEVICE_MMC2:
 	case BOOT_DEVICE_MMC2_2:
 		omap_mmc_init(1, 0, 0);
 		break;
 	}
 	return 0;
 }

 void spl_board_init(void)
 {
 #ifdef CONFIG_SPL_NAND_SUPPORT
 	gpmc_init();
 #endif
 #ifdef CONFIG_SPL_I2C_SUPPORT
 	i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
 #endif
 }
 #endif /* CONFIG_SPL_BUILD */


 /******************************************************************************
  * Routine: secure_unlock
  * Description: Setup security registers for access
  *              (GP Device only)
  *****************************************************************************/
 void secure_unlock_mem(void)
 {
 	struct pm *pm_rt_ape_base = (struct pm *)PM_RT_APE_BASE_ADDR_ARM;
 	struct pm *pm_gpmc_base = (struct pm *)PM_GPMC_BASE_ADDR_ARM;
 	struct pm *pm_ocm_ram_base = (struct pm *)PM_OCM_RAM_BASE_ADDR_ARM;
 	struct pm *pm_iva2_base = (struct pm *)PM_IVA2_BASE_ADDR_ARM;
 	struct sms *sms_base = (struct sms *)OMAP34XX_SMS_BASE;

 	/* Protection Module Register Target APE (PM_RT) */
 	writel(UNLOCK_1, &pm_rt_ape_base->req_info_permission_1);
 	writel(UNLOCK_1, &pm_rt_ape_base->read_permission_0);
 	writel(UNLOCK_1, &pm_rt_ape_base->wirte_permission_0);
 	writel(UNLOCK_2, &pm_rt_ape_base->addr_match_1);

 	writel(UNLOCK_3, &pm_gpmc_base->req_info_permission_0);
 	writel(UNLOCK_3, &pm_gpmc_base->read_permission_0);
 	writel(UNLOCK_3, &pm_gpmc_base->wirte_permission_0);

 	writel(UNLOCK_3, &pm_ocm_ram_base->req_info_permission_0);
 	writel(UNLOCK_3, &pm_ocm_ram_base->read_permission_0);
 	writel(UNLOCK_3, &pm_ocm_ram_base->wirte_permission_0);
 	writel(UNLOCK_2, &pm_ocm_ram_base->addr_match_2);

 	/* IVA Changes */
 	writel(UNLOCK_3, &pm_iva2_base->req_info_permission_0);
 	writel(UNLOCK_3, &pm_iva2_base->read_permission_0);
 	writel(UNLOCK_3, &pm_iva2_base->wirte_permission_0);

 	/* SDRC region 0 public */
 	writel(UNLOCK_1, &sms_base->rg_att0);
 }

 /******************************************************************************
  * Routine: secureworld_exit()
  * Description: If chip is EMU and boot type is external
  *		configure secure registers and exit secure world
  *              general use.
  *****************************************************************************/
 void secureworld_exit()
 {
 	unsigned long i;

 	/* configure non-secure access control register */
 	__asm__ __volatile__("mrc p15, 0, %0, c1, c1, 2":"=r"(i));
 	/* enabling co-processor CP10 and CP11 accesses in NS world */
 	__asm__ __volatile__("orr %0, %0, #0xC00":"=r"(i));
 	/*
 	 * allow allocation of locked TLBs and L2 lines in NS world
 	 * allow use of PLE registers in NS world also
 	 */
 	__asm__ __volatile__("orr %0, %0, #0x70000":"=r"(i));
 	__asm__ __volatile__("mcr p15, 0, %0, c1, c1, 2":"=r"(i));

 	/* Enable ASA in ACR register */
 	__asm__ __volatile__("mrc p15, 0, %0, c1, c0, 1":"=r"(i));
 	__asm__ __volatile__("orr %0, %0, #0x10":"=r"(i));
 	__asm__ __volatile__("mcr p15, 0, %0, c1, c0, 1":"=r"(i));

 	/* Exiting secure world */
 	__asm__ __volatile__("mrc p15, 0, %0, c1, c1, 0":"=r"(i));
 	__asm__ __volatile__("orr %0, %0, #0x31":"=r"(i));
 	__asm__ __volatile__("mcr p15, 0, %0, c1, c1, 0":"=r"(i));
 }

 /******************************************************************************
  * Routine: try_unlock_sram()
  * Description: If chip is GP/EMU(special) type, unlock the SRAM for
  *              general use.
  *****************************************************************************/
 void try_unlock_memory()
 {
 	int mode;
 	int in_sdram = is_running_in_sdram();

 	/*
 	 * if GP device unlock device SRAM for general use
 	 * secure code breaks for Secure/Emulation device - HS/E/T
 	 */
 	mode = get_device_type();
 	if (mode == GP_DEVICE)
 		secure_unlock_mem();

 	/*
 	 * If device is EMU and boot is XIP external booting
 	 * Unlock firewalls and disable L2 and put chip
 	 * out of secure world
 	 *
 	 * Assuming memories are unlocked by the demon who put us in SDRAM
 	 */
 	if ((mode <= EMU_DEVICE) && (get_boot_type() == 0x1F)
 	    && (!in_sdram)) {
 		secure_unlock_mem();
 		secureworld_exit();
 	}

 	return;
 }

 /******************************************************************************
  * Routine: s_init
  * Description: Does early system init of muxing and clocks.
  *              - Called path is with SRAM stack.
  *****************************************************************************/
 void s_init(void)
 {
 	int in_sdram = is_running_in_sdram();

 	watchdog_init();

 	try_unlock_memory();

 	/* Errata workarounds */
 	omap3_setup_aux_cr();

 #ifndef CONFIG_SYS_L2CACHE_OFF
 	/* Invalidate L2-cache from secure mode */
 	omap3_invalidate_l2_cache_secure();
 #endif

 	set_muxconf_regs();
 	sdelay(100);

 	prcm_init();

 	per_clocks_enable();

 #ifdef CONFIG_USB_EHCI_OMAP
 	ehci_clocks_enable();
 #endif

 #ifdef CONFIG_SPL_BUILD
 	gd = &gdata;

 	preloader_console_init();

 	timer_init();
 #endif

 	if (!in_sdram)
 		mem_init();
 }

 /*
  * Routine: misc_init_r
  * Description: A basic misc_init_r that just displays the die ID
  */
 int __weak misc_init_r(void)
 {
 	dieid_num_r();

 	return 0;
 }

 /******************************************************************************
  * Routine: wait_for_command_complete
  * Description: Wait for posting to finish on watchdog
  *****************************************************************************/
 void wait_for_command_complete(struct watchdog *wd_base)
 {
 	int pending = 1;
 	do {
 		pending = readl(&wd_base->wwps);
 	} while (pending);
 }

 /******************************************************************************
  * Routine: watchdog_init
  * Description: Shut down watch dogs
  *****************************************************************************/
 void watchdog_init(void)
 {
 	struct watchdog *wd2_base = (struct watchdog *)WD2_BASE;
 	struct prcm *prcm_base = (struct prcm *)PRCM_BASE;

 	/*
 	 * There are 3 watch dogs WD1=Secure, WD2=MPU, WD3=IVA. WD1 is
 	 * either taken care of by ROM (HS/EMU) or not accessible (GP).
 	 * We need to take care of WD2-MPU or take a PRCM reset. WD3
 	 * should not be running and does not generate a PRCM reset.
 	 */

 	sr32(&prcm_base->fclken_wkup, 5, 1, 1);
 	sr32(&prcm_base->iclken_wkup, 5, 1, 1);
 	wait_on_value(ST_WDT2, 0x20, &prcm_base->idlest_wkup, 5);

 	writel(WD_UNLOCK1, &wd2_base->wspr);
 	wait_for_command_complete(wd2_base);
 	writel(WD_UNLOCK2, &wd2_base->wspr);
 }

 /******************************************************************************
  * Dummy function to handle errors for EABI incompatibility
  *****************************************************************************/
 void abort(void)
 {
 }

 #if defined(CONFIG_NAND_OMAP_GPMC) & !defined(CONFIG_SPL_BUILD)
 /******************************************************************************
  * OMAP3 specific command to switch between NAND HW and SW ecc
  *****************************************************************************/
 static int do_switch_ecc(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
 {
 	if (argc != 2)
 		goto usage;
 	if (strncmp(argv[1], "hw", 2) == 0)
 		omap_nand_switch_ecc(1);
 	else if (strncmp(argv[1], "sw", 2) == 0)
 		omap_nand_switch_ecc(0);
 	else
 		goto usage;

 	return 0;

 usage:
 	printf ("Usage: nandecc %s\n", cmdtp->usage);
 	return 1;
 }

 U_BOOT_CMD(
 	nandecc, 2, 1,	do_switch_ecc,
 	"switch OMAP3 NAND ECC calculation algorithm",
 	"[hw/sw] - Switch between NAND hardware (hw) or software (sw) ecc algorithm"
 );

 #endif /* CONFIG_NAND_OMAP_GPMC & !CONFIG_SPL_BUILD */

 #ifdef CONFIG_DISPLAY_BOARDINFO
 /**
  * Print board information
  */
 int checkboard (void)
 {
 	char *mem_s ;

 	if (is_mem_sdr())
 		mem_s = "mSDR";
 	else
 		mem_s = "LPDDR";

 	printf("%s + %s/%s\n", sysinfo.board_string, mem_s,
 			sysinfo.nand_string);

 	return 0;
 }
 #endif	/* CONFIG_DISPLAY_BOARDINFO */

 static void omap3_emu_romcode_call(u32 service_id, u32 *parameters)
 {
 	u32 i, num_params = *parameters;
 	u32 *sram_scratch_space = (u32 *)OMAP3_PUBLIC_SRAM_SCRATCH_AREA;

 	/*
 	 * copy the parameters to an un-cached area to avoid coherency
 	 * issues
 	 */
 	for (i = 0; i < num_params; i++) {
 		__raw_writel(*parameters, sram_scratch_space);
 		parameters++;
 		sram_scratch_space++;
 	}

 	/* Now make the PPA call */
 	do_omap3_emu_romcode_call(service_id, OMAP3_PUBLIC_SRAM_SCRATCH_AREA);
 }

 static void omap3_update_aux_cr_secure(u32 set_bits, u32 clear_bits)
 {
 	u32 acr;

 	/* Read ACR */
 	asm volatile ("mrc p15, 0, %0, c1, c0, 1" : "=r" (acr));
 	acr &= ~clear_bits;
 	acr |= set_bits;

 	if (get_device_type() == GP_DEVICE) {
 		omap3_gp_romcode_call(OMAP3_GP_ROMCODE_API_WRITE_ACR,
 				       acr);
 	} else {
 		struct emu_hal_params emu_romcode_params;
 		emu_romcode_params.num_params = 1;
 		emu_romcode_params.param1 = acr;
 		omap3_emu_romcode_call(OMAP3_EMU_HAL_API_WRITE_ACR,
 				       (u32 *)&emu_romcode_params);
 	}
 }

 static void omap3_setup_aux_cr(void)
 {
 	/* Workaround for Cortex-A8 errata: #454179 #430973
 	 *	Set "IBE" bit
 	 *	Set "Disable Branch Size Mispredicts" bit
 	 * Workaround for erratum #621766
 	 *	Enable L1NEON bit
 	 * ACR |= (IBE | DBSM | L1NEON) => ACR |= 0xE0
 	 */
 	omap3_update_aux_cr_secure(0xE0, 0);
 }

 #ifndef CONFIG_SYS_L2CACHE_OFF
 static void omap3_update_aux_cr(u32 set_bits, u32 clear_bits)
 {
 	u32 acr;

 	/* Read ACR */
 	asm volatile ("mrc p15, 0, %0, c1, c0, 1" : "=r" (acr));
 	acr &= ~clear_bits;
 	acr |= set_bits;

 	/* Write ACR - affects non-secure banked bits */
 	asm volatile ("mcr p15, 0, %0, c1, c0, 1" : : "r" (acr));
 }

 /* Invalidate the entire L2 cache from secure mode */
 static void omap3_invalidate_l2_cache_secure(void)
 {
 	if (get_device_type() == GP_DEVICE) {
 		omap3_gp_romcode_call(OMAP3_GP_ROMCODE_API_L2_INVAL,
 				      0);
 	} else {
 		struct emu_hal_params emu_romcode_params;
 		emu_romcode_params.num_params = 1;
 		emu_romcode_params.param1 = 0;
 		omap3_emu_romcode_call(OMAP3_EMU_HAL_API_L2_INVAL,
 				       (u32 *)&emu_romcode_params);
 	}
 }

 void v7_outer_cache_enable(void)
 {
 	/* Set L2EN */
 	omap3_update_aux_cr_secure(0x2, 0);

 	/*
 	 * On some revisions L2EN bit is banked on some revisions it's not
 	 * No harm in setting both banked bits(in fact this is required
 	 * by an erratum)
 	 */
 	omap3_update_aux_cr(0x2, 0);
 }

 void omap3_outer_cache_disable(void)
 {
 	/* Clear L2EN */
 	omap3_update_aux_cr_secure(0, 0x2);

 	/*
 	 * On some revisions L2EN bit is banked on some revisions it's not
 	 * No harm in clearing both banked bits(in fact this is required
 	 * by an erratum)
 	 */
 	omap3_update_aux_cr(0, 0x2);
 }
 #endif

 #ifndef CONFIG_SYS_DCACHE_OFF
 void enable_caches(void)
 {
 	/* Enable D-cache. I-cache is already enabled in start.S */
 	dcache_enable();
 }
 #endif
	/*
	*
	* Common board functions for OMAP3 based boards.
	*
	* (C) Copyright 2004-2008
	* Texas Instruments, <www.ti.com>
	*
	* Author :
	* Sunil Kumar <sunilsaini05@gmail.com>
	* Shashi Ranjan <shashiranjanmca05@gmail.com>
	*
	* Derived from Beagle Board and 3430 SDP code by
	* Richard Woodruff <r-woodruff2@ti.com>
	* Syed Mohammed Khasim <khasim@ti.com>
	*
	*
	* 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 <spl.h>
	#include <asm/io.h>
	#include <asm/arch/sys_proto.h>
	#include <asm/arch/mem.h>
	#include <asm/cache.h>
	#include <asm/armv7.h>
	#include <asm/arch/gpio.h>
	#include <asm/omap_common.h>
	#include <asm/arch/mmc_host_def.h>
	#include <i2c.h>
	#include <linux/compiler.h>

	DECLARE_GLOBAL_DATA_PTR;

	/* Declarations */
	extern omap3_sysinfo sysinfo;
	static void omap3_setup_aux_cr(void);
	#ifndef CONFIG_SYS_L2CACHE_OFF
	static void omap3_invalidate_l2_cache_secure(void);
	#endif

	static const struct gpio_bank gpio_bank_34xx[6] = {
	{ (void *)OMAP34XX_GPIO1_BASE, METHOD_GPIO_24XX },
	{ (void *)OMAP34XX_GPIO2_BASE, METHOD_GPIO_24XX },
	{ (void *)OMAP34XX_GPIO3_BASE, METHOD_GPIO_24XX },
	{ (void *)OMAP34XX_GPIO4_BASE, METHOD_GPIO_24XX },
	{ (void *)OMAP34XX_GPIO5_BASE, METHOD_GPIO_24XX },
	{ (void *)OMAP34XX_GPIO6_BASE, METHOD_GPIO_24XX },
	};

	const struct gpio_bank *const omap_gpio_bank = gpio_bank_34xx;

	#ifdef CONFIG_SPL_BUILD
	/*
	* We use static variables because global data is not ready yet.
	* Initialized data is available in SPL right from the beginning.
	* We would not typically need to save these parameters in regular
	* U-Boot. This is needed only in SPL at the moment.
	*/
	u32 omap3_boot_device = BOOT_DEVICE_NAND;

	/* auto boot mode detection is not possible for OMAP3 - hard code */
	u32 spl_boot_mode(void)
	{
	switch (spl_boot_device()) {
	case BOOT_DEVICE_MMC2:
	return MMCSD_MODE_RAW;
	case BOOT_DEVICE_MMC1:
	return MMCSD_MODE_FAT;
	break;
	default:
	puts("spl: ERROR: unknown device - can't select boot mode\n");
	hang();
	}
	}

	u32 spl_boot_device(void)
	{
	return omap3_boot_device;
	}

	int board_mmc_init(bd_t *bis)
	{
	switch (spl_boot_device()) {
	case BOOT_DEVICE_MMC1:
	omap_mmc_init(0, 0, 0);
	break;
	case BOOT_DEVICE_MMC2:
	case BOOT_DEVICE_MMC2_2:
	omap_mmc_init(1, 0, 0);
	break;
	}
	return 0;
	}

	void spl_board_init(void)
	{
	#ifdef CONFIG_SPL_NAND_SUPPORT
	gpmc_init();
	#endif
	#ifdef CONFIG_SPL_I2C_SUPPORT
	i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
	#endif
	}
	#endif /* CONFIG_SPL_BUILD */


	/******************************************************************************
	* Routine: secure_unlock
	* Description: Setup security registers for access
	* (GP Device only)
	*****************************************************************************/
	void secure_unlock_mem(void)
	{
	struct pm pm_rt_ape_base = (struct pm )PM_RT_APE_BASE_ADDR_ARM;
	struct pm pm_gpmc_base = (struct pm )PM_GPMC_BASE_ADDR_ARM;
	struct pm pm_ocm_ram_base = (struct pm )PM_OCM_RAM_BASE_ADDR_ARM;
	struct pm pm_iva2_base = (struct pm )PM_IVA2_BASE_ADDR_ARM;
	struct sms sms_base = (struct sms )OMAP34XX_SMS_BASE;

	/* Protection Module Register Target APE (PM_RT) */
	writel(UNLOCK_1, &pm_rt_ape_base->req_info_permission_1);
	writel(UNLOCK_1, &pm_rt_ape_base->read_permission_0);
	writel(UNLOCK_1, &pm_rt_ape_base->wirte_permission_0);
	writel(UNLOCK_2, &pm_rt_ape_base->addr_match_1);

	writel(UNLOCK_3, &pm_gpmc_base->req_info_permission_0);
	writel(UNLOCK_3, &pm_gpmc_base->read_permission_0);
	writel(UNLOCK_3, &pm_gpmc_base->wirte_permission_0);

	writel(UNLOCK_3, &pm_ocm_ram_base->req_info_permission_0);
	writel(UNLOCK_3, &pm_ocm_ram_base->read_permission_0);
	writel(UNLOCK_3, &pm_ocm_ram_base->wirte_permission_0);
	writel(UNLOCK_2, &pm_ocm_ram_base->addr_match_2);

	/* IVA Changes */
	writel(UNLOCK_3, &pm_iva2_base->req_info_permission_0);
	writel(UNLOCK_3, &pm_iva2_base->read_permission_0);
	writel(UNLOCK_3, &pm_iva2_base->wirte_permission_0);

	/* SDRC region 0 public */
	writel(UNLOCK_1, &sms_base->rg_att0);
	}

	/******************************************************************************
	* Routine: secureworld_exit()
	* Description: If chip is EMU and boot type is external
	* configure secure registers and exit secure world
	* general use.
	*****************************************************************************/
	void secureworld_exit()
	{
	unsigned long i;

	/* configure non-secure access control register */
	__asm__ __volatile__("mrc p15, 0, %0, c1, c1, 2":"=r"(i));
	/* enabling co-processor CP10 and CP11 accesses in NS world */
	__asm__ __volatile__("orr %0, %0, #0xC00":"=r"(i));
	/*
	* allow allocation of locked TLBs and L2 lines in NS world
	* allow use of PLE registers in NS world also
	*/
	__asm__ __volatile__("orr %0, %0, #0x70000":"=r"(i));
	__asm__ __volatile__("mcr p15, 0, %0, c1, c1, 2":"=r"(i));

	/* Enable ASA in ACR register */
	__asm__ __volatile__("mrc p15, 0, %0, c1, c0, 1":"=r"(i));
	__asm__ __volatile__("orr %0, %0, #0x10":"=r"(i));
	__asm__ __volatile__("mcr p15, 0, %0, c1, c0, 1":"=r"(i));

	/* Exiting secure world */
	__asm__ __volatile__("mrc p15, 0, %0, c1, c1, 0":"=r"(i));
	__asm__ __volatile__("orr %0, %0, #0x31":"=r"(i));
	__asm__ __volatile__("mcr p15, 0, %0, c1, c1, 0":"=r"(i));
	}

	/******************************************************************************
	* Routine: try_unlock_sram()
	* Description: If chip is GP/EMU(special) type, unlock the SRAM for
	* general use.
	*****************************************************************************/
	void try_unlock_memory()
	{
	int mode;
	int in_sdram = is_running_in_sdram();

	/*
	* if GP device unlock device SRAM for general use
	* secure code breaks for Secure/Emulation device - HS/E/T
	*/
	mode = get_device_type();
	if (mode == GP_DEVICE)
	secure_unlock_mem();

	/*
	* If device is EMU and boot is XIP external booting
	* Unlock firewalls and disable L2 and put chip
	* out of secure world
	*
	* Assuming memories are unlocked by the demon who put us in SDRAM
	*/
	if ((mode <= EMU_DEVICE) && (get_boot_type() == 0x1F)
	&& (!in_sdram)) {
	secure_unlock_mem();
	secureworld_exit();
	}

	return;
	}

	/******************************************************************************
	* Routine: s_init
	* Description: Does early system init of muxing and clocks.
	* - Called path is with SRAM stack.
	*****************************************************************************/
	void s_init(void)
	{
	int in_sdram = is_running_in_sdram();

	watchdog_init();

	try_unlock_memory();

	/* Errata workarounds */
	omap3_setup_aux_cr();

	#ifndef CONFIG_SYS_L2CACHE_OFF
	/* Invalidate L2-cache from secure mode */
	omap3_invalidate_l2_cache_secure();
	#endif

	set_muxconf_regs();
	sdelay(100);

	prcm_init();

	per_clocks_enable();

	#ifdef CONFIG_USB_EHCI_OMAP
	ehci_clocks_enable();
	#endif

	#ifdef CONFIG_SPL_BUILD
	gd = &gdata;

	preloader_console_init();

	timer_init();
	#endif

	if (!in_sdram)
	mem_init();
	}

	/*
	* Routine: misc_init_r
	* Description: A basic misc_init_r that just displays the die ID
	*/
	int __weak misc_init_r(void)
	{
	dieid_num_r();

	return 0;
	}

	/******************************************************************************
	* Routine: wait_for_command_complete
	* Description: Wait for posting to finish on watchdog
	*****************************************************************************/
	void wait_for_command_complete(struct watchdog *wd_base)
	{
	int pending = 1;
	do {
	pending = readl(&wd_base->wwps);
	} while (pending);
	}

	/******************************************************************************
	* Routine: watchdog_init
	* Description: Shut down watch dogs
	*****************************************************************************/
	void watchdog_init(void)
	{
	struct watchdog wd2_base = (struct watchdog )WD2_BASE;
	struct prcm prcm_base = (struct prcm )PRCM_BASE;

	/*
	* There are 3 watch dogs WD1=Secure, WD2=MPU, WD3=IVA. WD1 is
	* either taken care of by ROM (HS/EMU) or not accessible (GP).
	* We need to take care of WD2-MPU or take a PRCM reset. WD3
	* should not be running and does not generate a PRCM reset.
	*/

	sr32(&prcm_base->fclken_wkup, 5, 1, 1);
	sr32(&prcm_base->iclken_wkup, 5, 1, 1);
	wait_on_value(ST_WDT2, 0x20, &prcm_base->idlest_wkup, 5);

	writel(WD_UNLOCK1, &wd2_base->wspr);
	wait_for_command_complete(wd2_base);
	writel(WD_UNLOCK2, &wd2_base->wspr);
	}

	/******************************************************************************
	* Dummy function to handle errors for EABI incompatibility
	*****************************************************************************/
	void abort(void)
	{
	}

	#if defined(CONFIG_NAND_OMAP_GPMC) & !defined(CONFIG_SPL_BUILD)
	/******************************************************************************
	* OMAP3 specific command to switch between NAND HW and SW ecc
	*****************************************************************************/
	static int do_switch_ecc(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
	{
	if (argc != 2)
	goto usage;
	if (strncmp(argv[1], "hw", 2) == 0)
	omap_nand_switch_ecc(1);
	else if (strncmp(argv[1], "sw", 2) == 0)
	omap_nand_switch_ecc(0);
	else
	goto usage;

	return 0;

	usage:
	printf ("Usage: nandecc %s\n", cmdtp->usage);
	return 1;
	}

	U_BOOT_CMD(
	nandecc, 2, 1, do_switch_ecc,
	"switch OMAP3 NAND ECC calculation algorithm",
	"[hw/sw] - Switch between NAND hardware (hw) or software (sw) ecc algorithm"
	);

	#endif /* CONFIG_NAND_OMAP_GPMC & !CONFIG_SPL_BUILD */

	#ifdef CONFIG_DISPLAY_BOARDINFO
	/**
	* Print board information
	*/
	int checkboard (void)
	{
	char *mem_s ;

	if (is_mem_sdr())
	mem_s = "mSDR";
	else
	mem_s = "LPDDR";

	printf("%s + %s/%s\n", sysinfo.board_string, mem_s,
	sysinfo.nand_string);

	return 0;
	}
	#endif /* CONFIG_DISPLAY_BOARDINFO */

	static void omap3_emu_romcode_call(u32 service_id, u32 *parameters)
	{
	u32 i, num_params = *parameters;
	u32 sram_scratch_space = (u32 )OMAP3_PUBLIC_SRAM_SCRATCH_AREA;

	/*
	* copy the parameters to an un-cached area to avoid coherency
	* issues
	*/
	for (i = 0; i < num_params; i++) {
	__raw_writel(*parameters, sram_scratch_space);
	parameters++;
	sram_scratch_space++;
	}

	/* Now make the PPA call */
	do_omap3_emu_romcode_call(service_id, OMAP3_PUBLIC_SRAM_SCRATCH_AREA);
	}

	static void omap3_update_aux_cr_secure(u32 set_bits, u32 clear_bits)
	{
	u32 acr;

	/* Read ACR */
	asm volatile ("mrc p15, 0, %0, c1, c0, 1" : "=r" (acr));
	acr &= ~clear_bits;
	acr \|= set_bits;

	if (get_device_type() == GP_DEVICE) {
	omap3_gp_romcode_call(OMAP3_GP_ROMCODE_API_WRITE_ACR,
	acr);
	} else {
	struct emu_hal_params emu_romcode_params;
	emu_romcode_params.num_params = 1;
	emu_romcode_params.param1 = acr;
	omap3_emu_romcode_call(OMAP3_EMU_HAL_API_WRITE_ACR,
	(u32 *)&emu_romcode_params);
	}
	}

	static void omap3_setup_aux_cr(void)
	{
	/* Workaround for Cortex-A8 errata: #454179 #430973
	* Set "IBE" bit
	* Set "Disable Branch Size Mispredicts" bit
	* Workaround for erratum #621766
	* Enable L1NEON bit
	* ACR \|= (IBE \| DBSM \| L1NEON) => ACR \|= 0xE0
	*/
	omap3_update_aux_cr_secure(0xE0, 0);
	}

	#ifndef CONFIG_SYS_L2CACHE_OFF
	static void omap3_update_aux_cr(u32 set_bits, u32 clear_bits)
	{
	u32 acr;

	/* Read ACR */
	asm volatile ("mrc p15, 0, %0, c1, c0, 1" : "=r" (acr));
	acr &= ~clear_bits;
	acr \|= set_bits;

	/* Write ACR - affects non-secure banked bits */
	asm volatile ("mcr p15, 0, %0, c1, c0, 1" : : "r" (acr));
	}

	/* Invalidate the entire L2 cache from secure mode */
	static void omap3_invalidate_l2_cache_secure(void)
	{
	if (get_device_type() == GP_DEVICE) {
	omap3_gp_romcode_call(OMAP3_GP_ROMCODE_API_L2_INVAL,
	0);
	} else {
	struct emu_hal_params emu_romcode_params;
	emu_romcode_params.num_params = 1;
	emu_romcode_params.param1 = 0;
	omap3_emu_romcode_call(OMAP3_EMU_HAL_API_L2_INVAL,
	(u32 *)&emu_romcode_params);
	}
	}

	void v7_outer_cache_enable(void)
	{
	/* Set L2EN */
	omap3_update_aux_cr_secure(0x2, 0);

	/*
	* On some revisions L2EN bit is banked on some revisions it's not
	* No harm in setting both banked bits(in fact this is required
	* by an erratum)
	*/
	omap3_update_aux_cr(0x2, 0);
	}

	void omap3_outer_cache_disable(void)
	{
	/* Clear L2EN */
	omap3_update_aux_cr_secure(0, 0x2);

	/*
	* On some revisions L2EN bit is banked on some revisions it's not
	* No harm in clearing both banked bits(in fact this is required
	* by an erratum)
	*/
	omap3_update_aux_cr(0, 0x2);
	}
	#endif

	#ifndef CONFIG_SYS_DCACHE_OFF
	void enable_caches(void)
	{
	/* Enable D-cache. I-cache is already enabled in start.S */
	dcache_enable();
	}
	#endif