board/siemens/taurus/taurus.c - github/trini/u-boot - Gitiles

 /*
  * Board functions for Siemens TAURUS (AT91SAM9G20) based boards
  * (C) Copyright Siemens AG
  *
  * Based on:
  * U-Boot file: board/atmel/at91sam9260ek/at91sam9260ek.c
  *
  * (C) Copyright 2007-2008
  * Stelian Pop <stelian@popies.net>
  * Lead Tech Design <www.leadtechdesign.com>
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */

 #include <command.h>
 #include <common.h>
 #include <asm/io.h>
 #include <asm/arch/at91sam9260_matrix.h>
 #include <asm/arch/at91sam9_smc.h>
 #include <asm/arch/at91_common.h>
 #include <asm/arch/at91_rstc.h>
 #include <asm/arch/gpio.h>
 #include <asm/arch/at91sam9_sdramc.h>
 #include <asm/arch/clk.h>
 #include <linux/mtd/nand.h>
 #include <atmel_mci.h>
 #include <asm/arch/at91_spi.h>
 #include <spi.h>

 #include <net.h>
 #include <netdev.h>

 DECLARE_GLOBAL_DATA_PTR;

 static void taurus_nand_hw_init(void)
 {
 	struct at91_smc *smc = (struct at91_smc *)ATMEL_BASE_SMC;
 	struct at91_matrix *matrix = (struct at91_matrix *)ATMEL_BASE_MATRIX;
 	unsigned long csa;

 	/* Assign CS3 to NAND/SmartMedia Interface */
 	csa = readl(&matrix->ebicsa);
 	csa |= AT91_MATRIX_CS3A_SMC_SMARTMEDIA;
 	writel(csa, &matrix->ebicsa);

 	/* Configure SMC CS3 for NAND/SmartMedia */
 	writel(AT91_SMC_SETUP_NWE(2) | AT91_SMC_SETUP_NCS_WR(0) |
 	       AT91_SMC_SETUP_NRD(2) | AT91_SMC_SETUP_NCS_RD(0),
 	       &smc->cs[3].setup);
 	writel(AT91_SMC_PULSE_NWE(4) | AT91_SMC_PULSE_NCS_WR(3) |
 	       AT91_SMC_PULSE_NRD(4) | AT91_SMC_PULSE_NCS_RD(3),
 	       &smc->cs[3].pulse);
 	writel(AT91_SMC_CYCLE_NWE(7) | AT91_SMC_CYCLE_NRD(7),
 	       &smc->cs[3].cycle);
 	writel(AT91_SMC_MODE_RM_NRD | AT91_SMC_MODE_WM_NWE |
 	       AT91_SMC_MODE_EXNW_DISABLE |
 	       AT91_SMC_MODE_DBW_8 |
 	       AT91_SMC_MODE_TDF_CYCLE(3),
 	       &smc->cs[3].mode);

 	/* Configure RDY/BSY */
 	at91_set_gpio_input(CONFIG_SYS_NAND_READY_PIN, 1);

 	/* Enable NandFlash */
 	at91_set_gpio_output(CONFIG_SYS_NAND_ENABLE_PIN, 1);
 }

 #if defined(CONFIG_SPL_BUILD)
 #include <spl.h>
 #include <nand.h>
 #include <spi_flash.h>

 void matrix_init(void)
 {
 	struct at91_matrix *mat = (struct at91_matrix *)ATMEL_BASE_MATRIX;

 	writel((readl(&mat->scfg[3]) & (~AT91_MATRIX_SLOT_CYCLE))
 			| AT91_MATRIX_SLOT_CYCLE_(0x40),
 			&mat->scfg[3]);
 }

 #if defined(CONFIG_BOARD_AXM)
 static int at91_is_recovery(void)
 {
 	if ((at91_get_gpio_value(AT91_PIN_PA26) == 0) &&
 	    (at91_get_gpio_value(AT91_PIN_PA27) == 0))
 		return 1;

 	return 0;
 }
 #elif defined(CONFIG_BOARD_TAURUS)
 static int at91_is_recovery(void)
 {
 	if (at91_get_gpio_value(AT91_PIN_PA31) == 0)
 		return 1;

 	return 0;
 }
 #endif

 void spl_board_init(void)
 {
 	taurus_nand_hw_init();
 	at91_spi0_hw_init(TAURUS_SPI_MASK);

 #if defined(CONFIG_BOARD_AXM)
 	/* Configure LED PINs */
 	at91_set_gpio_output(AT91_PIN_PA6, 0);
 	at91_set_gpio_output(AT91_PIN_PA8, 0);
 	at91_set_gpio_output(AT91_PIN_PA9, 0);
 	at91_set_gpio_output(AT91_PIN_PA10, 0);
 	at91_set_gpio_output(AT91_PIN_PA11, 0);
 	at91_set_gpio_output(AT91_PIN_PA12, 0);

 	/* Configure recovery button PINs */
 	at91_set_gpio_input(AT91_PIN_PA26, 1);
 	at91_set_gpio_input(AT91_PIN_PA27, 1);
 #elif defined(CONFIG_BOARD_TAURUS)
 	at91_set_gpio_input(AT91_PIN_PA31, 1);
 #endif

 	/* check for recovery mode */
 	if (at91_is_recovery() == 1) {
 		struct spi_flash *flash;

 		puts("Recovery button pressed\n");
 		nand_init();
 		spl_nand_erase_one(0, 0);
 		flash = spi_flash_probe(CONFIG_SF_DEFAULT_BUS,
 					0,
 					CONFIG_SF_DEFAULT_SPEED,
 					CONFIG_SF_DEFAULT_MODE);
 		if (!flash) {
 			puts("no flash\n");
 		} else {
 			puts("erase spi flash sector 0\n");
 			spi_flash_erase(flash, 0,
 					CONFIG_SYS_NAND_U_BOOT_SIZE);
 		}
 	}
 }

 #define SDRAM_BASE_CONF	(AT91_SDRAMC_NR_13 | AT91_SDRAMC_CAS_3 \
 			 |AT91_SDRAMC_NB_4 | AT91_SDRAMC_DBW_32 \
 			 | AT91_SDRAMC_TWR_VAL(3) | AT91_SDRAMC_TRC_VAL(9) \
 			 | AT91_SDRAMC_TRP_VAL(3) | AT91_SDRAMC_TRCD_VAL(3) \
 			 | AT91_SDRAMC_TRAS_VAL(6) | AT91_SDRAMC_TXSR_VAL(10))

 void sdramc_configure(unsigned int mask)
 {
 	struct at91_matrix *ma = (struct at91_matrix *)ATMEL_BASE_MATRIX;
 	struct sdramc_reg setting;

 	at91_sdram_hw_init();
 	setting.cr = SDRAM_BASE_CONF | mask;
 	setting.mdr = AT91_SDRAMC_MD_SDRAM;
 	setting.tr = (CONFIG_SYS_MASTER_CLOCK * 7) / 1000000;

 	writel(readl(&ma->ebicsa) | AT91_MATRIX_CS1A_SDRAMC |
 		AT91_MATRIX_VDDIOMSEL_3_3V | AT91_MATRIX_EBI_IOSR_SEL,
 		&ma->ebicsa);

 	sdramc_initialize(ATMEL_BASE_CS1, &setting);
 }

 void mem_init(void)
 {
 	unsigned int ram_size = 0;

 	/* Configure SDRAM for 128MB */
 	sdramc_configure(AT91_SDRAMC_NC_10);

 	/* Do memtest for 128MB */
 	ram_size = get_ram_size((void *)CONFIG_SYS_SDRAM_BASE,
 				CONFIG_SYS_SDRAM_SIZE);

 	/*
 	 * If 32MB or 16MB should be supported check also for
 	 * expected mirroring at A16 and A17
 	 * To find mirror addresses depends how the collumns are connected
 	 * at RAM (internaly or externaly)
 	 * If the collumns are not in inverted order the mirror size effect
 	 * behaves like normal SRAM with A0,A1,A2,etc. connected incremantal
 	 */

 	/* Mirrors at A15 on ATMEL G20 SDRAM Controller with 64MB*/
 	if (ram_size == 0x800) {
 		printf("\n\r 64MB");
 		sdramc_configure(AT91_SDRAMC_NC_9);
 	} else {
 		/* Size already initialized */
 		printf("\n\r 128MB");
 	}
 }
 #endif

 #ifdef CONFIG_MACB
 static void siemens_phy_reset(void)
 {
 	/*
 	 * we need to reset PHY for 200us
 	 * because of bug in ATMEL G20 CPU (undefined initial state of GPIO)
 	 */
 	if ((readl(AT91_ASM_RSTC_SR) & AT91_RSTC_RSTTYP) ==
 	    AT91_RSTC_RSTTYP_GENERAL)
 		at91_set_gpio_value(AT91_PIN_PA25, 0); /* reset eth switch */
 }

 static void taurus_macb_hw_init(void)
 {
 	/* Enable EMAC clock */
 	at91_periph_clk_enable(ATMEL_ID_EMAC0);

 	/*
 	 * Disable pull-up on:
 	 *	RXDV (PA17) => PHY normal mode (not Test mode)
 	 *	ERX0 (PA14) => PHY ADDR0
 	 *	ERX1 (PA15) => PHY ADDR1
 	 *	ERX2 (PA25) => PHY ADDR2
 	 *	ERX3 (PA26) => PHY ADDR3
 	 *	ECRS (PA28) => PHY ADDR4  => PHYADDR = 0x0
 	 *
 	 * PHY has internal pull-down
 	 */
 	at91_set_pio_pullup(AT91_PIO_PORTA, 14, 0);
 	at91_set_pio_pullup(AT91_PIO_PORTA, 15, 0);
 	at91_set_pio_pullup(AT91_PIO_PORTA, 17, 0);
 	at91_set_pio_pullup(AT91_PIO_PORTA, 25, 0);
 	at91_set_pio_pullup(AT91_PIO_PORTA, 26, 0);
 	at91_set_pio_pullup(AT91_PIO_PORTA, 28, 0);

 	siemens_phy_reset();

 	at91_phy_reset();

 	at91_set_gpio_input(AT91_PIN_PA25, 1);   /* ERST tri-state */

 	/* Re-enable pull-up */
 	at91_set_pio_pullup(AT91_PIO_PORTA, 14, 1);
 	at91_set_pio_pullup(AT91_PIO_PORTA, 15, 1);
 	at91_set_pio_pullup(AT91_PIO_PORTA, 17, 1);
 	at91_set_pio_pullup(AT91_PIO_PORTA, 25, 1);
 	at91_set_pio_pullup(AT91_PIO_PORTA, 26, 1);
 	at91_set_pio_pullup(AT91_PIO_PORTA, 28, 1);

 	/* Initialize EMAC=MACB hardware */
 	at91_macb_hw_init();
 }
 #endif

 #ifdef CONFIG_GENERIC_ATMEL_MCI
 int board_mmc_init(bd_t *bd)
 {
 	at91_mci_hw_init();

 	return atmel_mci_init((void *)ATMEL_BASE_MCI);
 }
 #endif

 int board_early_init_f(void)
 {
 	/* Enable clocks for all PIOs */
 	at91_periph_clk_enable(ATMEL_ID_PIOA);
 	at91_periph_clk_enable(ATMEL_ID_PIOB);
 	at91_periph_clk_enable(ATMEL_ID_PIOC);

 	at91_seriald_hw_init();

 	return 0;
 }

 int spi_cs_is_valid(unsigned int bus, unsigned int cs)
 {
 	return bus == 0 && cs == 0;
 }

 void spi_cs_activate(struct spi_slave *slave)
 {
 	at91_set_gpio_value(TAURUS_SPI_CS_PIN, 0);
 }

 void spi_cs_deactivate(struct spi_slave *slave)
 {
 	at91_set_gpio_value(TAURUS_SPI_CS_PIN, 1);
 }

 #ifdef CONFIG_USB_GADGET_AT91
 #include <linux/usb/at91_udc.h>

 void at91_udp_hw_init(void)
 {
 	at91_pmc_t *pmc = (at91_pmc_t *)ATMEL_BASE_PMC;

 	/* Enable PLLB */
 	writel(get_pllb_init(), &pmc->pllbr);
 	while ((readl(&pmc->sr) & AT91_PMC_LOCKB) != AT91_PMC_LOCKB)
 		;

 	/* Enable UDPCK clock, MCK is enabled in at91_clock_init() */
 	at91_periph_clk_enable(ATMEL_ID_UDP);

 	at91_system_clk_enable(AT91SAM926x_PMC_UDP);
 }

 struct at91_udc_data board_udc_data  = {
 	.baseaddr = ATMEL_BASE_UDP0,
 };
 #endif

 int board_init(void)
 {
 	/* adress of boot parameters */
 	gd->bd->bi_boot_params = CONFIG_SYS_SDRAM_BASE + 0x100;

 #ifdef CONFIG_CMD_NAND
 	taurus_nand_hw_init();
 #endif
 #ifdef CONFIG_MACB
 	taurus_macb_hw_init();
 #endif
 	at91_spi0_hw_init(TAURUS_SPI_MASK);
 #ifdef CONFIG_USB_GADGET_AT91
 	at91_udp_hw_init();
 	at91_udc_probe(&board_udc_data);
 #endif

 	return 0;
 }

 int dram_init(void)
 {
 	gd->ram_size = get_ram_size((void *)CONFIG_SYS_SDRAM_BASE,
 				    CONFIG_SYS_SDRAM_SIZE);
 	return 0;
 }

 int board_eth_init(bd_t *bis)
 {
 	int rc = 0;
 #ifdef CONFIG_MACB
 	rc = macb_eth_initialize(0, (void *)ATMEL_BASE_EMAC0, 0x00);
 #endif
 	return rc;
 }

 #if !defined(CONFIG_SPL_BUILD)
 #if defined(CONFIG_BOARD_AXM)
 /*
  * Booting the Fallback Image.
  *
  *  The function is used to provide and
  *  boot the image with the fallback
  *  parameters, incase if the faulty image
  *  in upgraded over the base firmware.
  *
  */
 static int upgrade_failure_fallback(void)
 {
 	char *partitionset_active = NULL;
 	char *rootfs = NULL;
 	char *rootfs_fallback = NULL;
 	char *kern_off;
 	char *kern_off_fb;
 	char *kern_size;
 	char *kern_size_fb;

 	partitionset_active = getenv("partitionset_active");
 	if (partitionset_active) {
 		if (partitionset_active[0] == 'A')
 			setenv("partitionset_active", "B");
 		else
 			setenv("partitionset_active", "A");
 	} else {
 		printf("partitionset_active missing.\n");
 		return -ENOENT;
 	}

 	rootfs = getenv("rootfs");
 	rootfs_fallback = getenv("rootfs_fallback");
 	setenv("rootfs", rootfs_fallback);
 	setenv("rootfs_fallback", rootfs);

 	kern_size = getenv("kernel_size");
 	kern_size_fb = getenv("kernel_size_fallback");
 	setenv("kernel_size", kern_size_fb);
 	setenv("kernel_size_fallback", kern_size);

 	kern_off = getenv("kernel_Off");
 	kern_off_fb = getenv("kernel_Off_fallback");
 	setenv("kernel_Off", kern_off_fb);
 	setenv("kernel_Off_fallback", kern_off);

 	setenv("bootargs", '\0');
 	setenv("upgrade_available", '\0');
 	setenv("boot_retries", '\0');
 	saveenv();

 	return 0;
 }

 static int do_upgrade_available(cmd_tbl_t *cmdtp, int flag, int argc,
 			char * const argv[])
 {
 	unsigned long upgrade_available = 0;
 	unsigned long boot_retry = 0;
 	char boot_buf[10];

 	upgrade_available = simple_strtoul(getenv("upgrade_available"), NULL,
 					   10);
 	if (upgrade_available) {
 		boot_retry = simple_strtoul(getenv("boot_retries"), NULL, 10);
 		boot_retry++;
 		sprintf(boot_buf, "%lx", boot_retry);
 		setenv("boot_retries", boot_buf);
 		saveenv();

 		/*
 		 * Here the boot_retries count is checked, and if the
 		 * count becomes greater than 2 switch back to the
 		 * fallback, and reset the board.
 		 */

 		if (boot_retry > 2) {
 			if (upgrade_failure_fallback() == 0)
 				do_reset(NULL, 0, 0, NULL);
 			return -1;
 		}
 	}
 	return 0;
 }

 U_BOOT_CMD(
 	upgrade_available,	1,	1,	do_upgrade_available,
 	"check Siemens update",
 	"no parameters"
 );
 #endif
 #endif
	/*
	* Board functions for Siemens TAURUS (AT91SAM9G20) based boards
	* (C) Copyright Siemens AG
	*
	* Based on:
	* U-Boot file: board/atmel/at91sam9260ek/at91sam9260ek.c
	*
	* (C) Copyright 2007-2008
	* Stelian Pop <stelian@popies.net>
	* Lead Tech Design <www.leadtechdesign.com>
	*
	* SPDX-License-Identifier: GPL-2.0+
	*/

	#include <command.h>
	#include <common.h>
	#include <asm/io.h>
	#include <asm/arch/at91sam9260_matrix.h>
	#include <asm/arch/at91sam9_smc.h>
	#include <asm/arch/at91_common.h>
	#include <asm/arch/at91_rstc.h>
	#include <asm/arch/gpio.h>
	#include <asm/arch/at91sam9_sdramc.h>
	#include <asm/arch/clk.h>
	#include <linux/mtd/nand.h>
	#include <atmel_mci.h>
	#include <asm/arch/at91_spi.h>
	#include <spi.h>

	#include <net.h>
	#include <netdev.h>

	DECLARE_GLOBAL_DATA_PTR;

	static void taurus_nand_hw_init(void)
	{
	struct at91_smc smc = (struct at91_smc )ATMEL_BASE_SMC;
	struct at91_matrix matrix = (struct at91_matrix )ATMEL_BASE_MATRIX;
	unsigned long csa;

	/* Assign CS3 to NAND/SmartMedia Interface */
	csa = readl(&matrix->ebicsa);
	csa \|= AT91_MATRIX_CS3A_SMC_SMARTMEDIA;
	writel(csa, &matrix->ebicsa);

	/* Configure SMC CS3 for NAND/SmartMedia */
	writel(AT91_SMC_SETUP_NWE(2) \| AT91_SMC_SETUP_NCS_WR(0) \|
	AT91_SMC_SETUP_NRD(2) \| AT91_SMC_SETUP_NCS_RD(0),
	&smc->cs[3].setup);
	writel(AT91_SMC_PULSE_NWE(4) \| AT91_SMC_PULSE_NCS_WR(3) \|
	AT91_SMC_PULSE_NRD(4) \| AT91_SMC_PULSE_NCS_RD(3),
	&smc->cs[3].pulse);
	writel(AT91_SMC_CYCLE_NWE(7) \| AT91_SMC_CYCLE_NRD(7),
	&smc->cs[3].cycle);
	writel(AT91_SMC_MODE_RM_NRD \| AT91_SMC_MODE_WM_NWE \|
	AT91_SMC_MODE_EXNW_DISABLE \|
	AT91_SMC_MODE_DBW_8 \|
	AT91_SMC_MODE_TDF_CYCLE(3),
	&smc->cs[3].mode);

	/* Configure RDY/BSY */
	at91_set_gpio_input(CONFIG_SYS_NAND_READY_PIN, 1);

	/* Enable NandFlash */
	at91_set_gpio_output(CONFIG_SYS_NAND_ENABLE_PIN, 1);
	}

	#if defined(CONFIG_SPL_BUILD)
	#include <spl.h>
	#include <nand.h>
	#include <spi_flash.h>

	void matrix_init(void)
	{
	struct at91_matrix mat = (struct at91_matrix )ATMEL_BASE_MATRIX;

	writel((readl(&mat->scfg[3]) & (~AT91_MATRIX_SLOT_CYCLE))
	\| AT91_MATRIX_SLOT_CYCLE_(0x40),
	&mat->scfg[3]);
	}

	#if defined(CONFIG_BOARD_AXM)
	static int at91_is_recovery(void)
	{
	if ((at91_get_gpio_value(AT91_PIN_PA26) == 0) &&
	(at91_get_gpio_value(AT91_PIN_PA27) == 0))
	return 1;

	return 0;
	}
	#elif defined(CONFIG_BOARD_TAURUS)
	static int at91_is_recovery(void)
	{
	if (at91_get_gpio_value(AT91_PIN_PA31) == 0)
	return 1;

	return 0;
	}
	#endif

	void spl_board_init(void)
	{
	taurus_nand_hw_init();
	at91_spi0_hw_init(TAURUS_SPI_MASK);

	#if defined(CONFIG_BOARD_AXM)
	/* Configure LED PINs */
	at91_set_gpio_output(AT91_PIN_PA6, 0);
	at91_set_gpio_output(AT91_PIN_PA8, 0);
	at91_set_gpio_output(AT91_PIN_PA9, 0);
	at91_set_gpio_output(AT91_PIN_PA10, 0);
	at91_set_gpio_output(AT91_PIN_PA11, 0);
	at91_set_gpio_output(AT91_PIN_PA12, 0);

	/* Configure recovery button PINs */
	at91_set_gpio_input(AT91_PIN_PA26, 1);
	at91_set_gpio_input(AT91_PIN_PA27, 1);
	#elif defined(CONFIG_BOARD_TAURUS)
	at91_set_gpio_input(AT91_PIN_PA31, 1);
	#endif

	/* check for recovery mode */
	if (at91_is_recovery() == 1) {
	struct spi_flash *flash;

	puts("Recovery button pressed\n");
	nand_init();
	spl_nand_erase_one(0, 0);
	flash = spi_flash_probe(CONFIG_SF_DEFAULT_BUS,
	0,
	CONFIG_SF_DEFAULT_SPEED,
	CONFIG_SF_DEFAULT_MODE);
	if (!flash) {
	puts("no flash\n");
	} else {
	puts("erase spi flash sector 0\n");
	spi_flash_erase(flash, 0,
	CONFIG_SYS_NAND_U_BOOT_SIZE);
	}
	}
	}

	#define SDRAM_BASE_CONF (AT91_SDRAMC_NR_13 \| AT91_SDRAMC_CAS_3 \
	\|AT91_SDRAMC_NB_4 \| AT91_SDRAMC_DBW_32 \
	\| AT91_SDRAMC_TWR_VAL(3) \| AT91_SDRAMC_TRC_VAL(9) \
	\| AT91_SDRAMC_TRP_VAL(3) \| AT91_SDRAMC_TRCD_VAL(3) \
	\| AT91_SDRAMC_TRAS_VAL(6) \| AT91_SDRAMC_TXSR_VAL(10))

	void sdramc_configure(unsigned int mask)
	{
	struct at91_matrix ma = (struct at91_matrix )ATMEL_BASE_MATRIX;
	struct sdramc_reg setting;

	at91_sdram_hw_init();
	setting.cr = SDRAM_BASE_CONF \| mask;
	setting.mdr = AT91_SDRAMC_MD_SDRAM;
	setting.tr = (CONFIG_SYS_MASTER_CLOCK * 7) / 1000000;

	writel(readl(&ma->ebicsa) \| AT91_MATRIX_CS1A_SDRAMC \|
	AT91_MATRIX_VDDIOMSEL_3_3V \| AT91_MATRIX_EBI_IOSR_SEL,
	&ma->ebicsa);

	sdramc_initialize(ATMEL_BASE_CS1, &setting);
	}

	void mem_init(void)
	{
	unsigned int ram_size = 0;

	/* Configure SDRAM for 128MB */
	sdramc_configure(AT91_SDRAMC_NC_10);

	/* Do memtest for 128MB */
	ram_size = get_ram_size((void *)CONFIG_SYS_SDRAM_BASE,
	CONFIG_SYS_SDRAM_SIZE);

	/*
	* If 32MB or 16MB should be supported check also for
	* expected mirroring at A16 and A17
	* To find mirror addresses depends how the collumns are connected
	* at RAM (internaly or externaly)
	* If the collumns are not in inverted order the mirror size effect
	* behaves like normal SRAM with A0,A1,A2,etc. connected incremantal
	*/

	/* Mirrors at A15 on ATMEL G20 SDRAM Controller with 64MB*/
	if (ram_size == 0x800) {
	printf("\n\r 64MB");
	sdramc_configure(AT91_SDRAMC_NC_9);
	} else {
	/* Size already initialized */
	printf("\n\r 128MB");
	}
	}
	#endif

	#ifdef CONFIG_MACB
	static void siemens_phy_reset(void)
	{
	/*
	* we need to reset PHY for 200us
	* because of bug in ATMEL G20 CPU (undefined initial state of GPIO)
	*/
	if ((readl(AT91_ASM_RSTC_SR) & AT91_RSTC_RSTTYP) ==
	AT91_RSTC_RSTTYP_GENERAL)
	at91_set_gpio_value(AT91_PIN_PA25, 0); /* reset eth switch */
	}

	static void taurus_macb_hw_init(void)
	{
	/* Enable EMAC clock */
	at91_periph_clk_enable(ATMEL_ID_EMAC0);

	/*
	* Disable pull-up on:
	* RXDV (PA17) => PHY normal mode (not Test mode)
	* ERX0 (PA14) => PHY ADDR0
	* ERX1 (PA15) => PHY ADDR1
	* ERX2 (PA25) => PHY ADDR2
	* ERX3 (PA26) => PHY ADDR3
	* ECRS (PA28) => PHY ADDR4 => PHYADDR = 0x0
	*
	* PHY has internal pull-down
	*/
	at91_set_pio_pullup(AT91_PIO_PORTA, 14, 0);
	at91_set_pio_pullup(AT91_PIO_PORTA, 15, 0);
	at91_set_pio_pullup(AT91_PIO_PORTA, 17, 0);
	at91_set_pio_pullup(AT91_PIO_PORTA, 25, 0);
	at91_set_pio_pullup(AT91_PIO_PORTA, 26, 0);
	at91_set_pio_pullup(AT91_PIO_PORTA, 28, 0);

	siemens_phy_reset();

	at91_phy_reset();

	at91_set_gpio_input(AT91_PIN_PA25, 1); /* ERST tri-state */

	/* Re-enable pull-up */
	at91_set_pio_pullup(AT91_PIO_PORTA, 14, 1);
	at91_set_pio_pullup(AT91_PIO_PORTA, 15, 1);
	at91_set_pio_pullup(AT91_PIO_PORTA, 17, 1);
	at91_set_pio_pullup(AT91_PIO_PORTA, 25, 1);
	at91_set_pio_pullup(AT91_PIO_PORTA, 26, 1);
	at91_set_pio_pullup(AT91_PIO_PORTA, 28, 1);

	/* Initialize EMAC=MACB hardware */
	at91_macb_hw_init();
	}
	#endif

	#ifdef CONFIG_GENERIC_ATMEL_MCI
	int board_mmc_init(bd_t *bd)
	{
	at91_mci_hw_init();

	return atmel_mci_init((void *)ATMEL_BASE_MCI);
	}
	#endif

	int board_early_init_f(void)
	{
	/* Enable clocks for all PIOs */
	at91_periph_clk_enable(ATMEL_ID_PIOA);
	at91_periph_clk_enable(ATMEL_ID_PIOB);
	at91_periph_clk_enable(ATMEL_ID_PIOC);

	at91_seriald_hw_init();

	return 0;
	}

	int spi_cs_is_valid(unsigned int bus, unsigned int cs)
	{
	return bus == 0 && cs == 0;
	}

	void spi_cs_activate(struct spi_slave *slave)
	{
	at91_set_gpio_value(TAURUS_SPI_CS_PIN, 0);
	}

	void spi_cs_deactivate(struct spi_slave *slave)
	{
	at91_set_gpio_value(TAURUS_SPI_CS_PIN, 1);
	}

	#ifdef CONFIG_USB_GADGET_AT91
	#include <linux/usb/at91_udc.h>

	void at91_udp_hw_init(void)
	{
	at91_pmc_t pmc = (at91_pmc_t )ATMEL_BASE_PMC;

	/* Enable PLLB */
	writel(get_pllb_init(), &pmc->pllbr);
	while ((readl(&pmc->sr) & AT91_PMC_LOCKB) != AT91_PMC_LOCKB)
	;

	/* Enable UDPCK clock, MCK is enabled in at91_clock_init() */
	at91_periph_clk_enable(ATMEL_ID_UDP);

	at91_system_clk_enable(AT91SAM926x_PMC_UDP);
	}

	struct at91_udc_data board_udc_data = {
	.baseaddr = ATMEL_BASE_UDP0,
	};
	#endif

	int board_init(void)
	{
	/* adress of boot parameters */
	gd->bd->bi_boot_params = CONFIG_SYS_SDRAM_BASE + 0x100;

	#ifdef CONFIG_CMD_NAND
	taurus_nand_hw_init();
	#endif
	#ifdef CONFIG_MACB
	taurus_macb_hw_init();
	#endif
	at91_spi0_hw_init(TAURUS_SPI_MASK);
	#ifdef CONFIG_USB_GADGET_AT91
	at91_udp_hw_init();
	at91_udc_probe(&board_udc_data);
	#endif

	return 0;
	}

	int dram_init(void)
	{
	gd->ram_size = get_ram_size((void *)CONFIG_SYS_SDRAM_BASE,
	CONFIG_SYS_SDRAM_SIZE);
	return 0;
	}

	int board_eth_init(bd_t *bis)
	{
	int rc = 0;
	#ifdef CONFIG_MACB
	rc = macb_eth_initialize(0, (void *)ATMEL_BASE_EMAC0, 0x00);
	#endif
	return rc;
	}

	#if !defined(CONFIG_SPL_BUILD)
	#if defined(CONFIG_BOARD_AXM)
	/*
	* Booting the Fallback Image.
	*
	* The function is used to provide and
	* boot the image with the fallback
	* parameters, incase if the faulty image
	* in upgraded over the base firmware.
	*
	*/
	static int upgrade_failure_fallback(void)
	{
	char *partitionset_active = NULL;
	char *rootfs = NULL;
	char *rootfs_fallback = NULL;
	char *kern_off;
	char *kern_off_fb;
	char *kern_size;
	char *kern_size_fb;

	partitionset_active = getenv("partitionset_active");
	if (partitionset_active) {
	if (partitionset_active[0] == 'A')
	setenv("partitionset_active", "B");
	else
	setenv("partitionset_active", "A");
	} else {
	printf("partitionset_active missing.\n");
	return -ENOENT;
	}

	rootfs = getenv("rootfs");
	rootfs_fallback = getenv("rootfs_fallback");
	setenv("rootfs", rootfs_fallback);
	setenv("rootfs_fallback", rootfs);

	kern_size = getenv("kernel_size");
	kern_size_fb = getenv("kernel_size_fallback");
	setenv("kernel_size", kern_size_fb);
	setenv("kernel_size_fallback", kern_size);

	kern_off = getenv("kernel_Off");
	kern_off_fb = getenv("kernel_Off_fallback");
	setenv("kernel_Off", kern_off_fb);
	setenv("kernel_Off_fallback", kern_off);

	setenv("bootargs", '\0');
	setenv("upgrade_available", '\0');
	setenv("boot_retries", '\0');
	saveenv();

	return 0;
	}

	static int do_upgrade_available(cmd_tbl_t *cmdtp, int flag, int argc,
	char * const argv[])
	{
	unsigned long upgrade_available = 0;
	unsigned long boot_retry = 0;
	char boot_buf[10];

	upgrade_available = simple_strtoul(getenv("upgrade_available"), NULL,
	10);
	if (upgrade_available) {
	boot_retry = simple_strtoul(getenv("boot_retries"), NULL, 10);
	boot_retry++;
	sprintf(boot_buf, "%lx", boot_retry);
	setenv("boot_retries", boot_buf);
	saveenv();

	/*
	* Here the boot_retries count is checked, and if the
	* count becomes greater than 2 switch back to the
	* fallback, and reset the board.
	*/

	if (boot_retry > 2) {
	if (upgrade_failure_fallback() == 0)
	do_reset(NULL, 0, 0, NULL);
	return -1;
	}
	}
	return 0;
	}

	U_BOOT_CMD(
	upgrade_available, 1, 1, do_upgrade_available,
	"check Siemens update",
	"no parameters"
	);
	#endif
	#endif