arch/arm/cpu/arm926ejs/davinci/da850_lowlevel.c - filogic/uboot - Gitiles

 /*
  * SoC-specific lowlevel code for DA850
  *
  * Copyright (C) 2011
  * Heiko Schocher, DENX Software Engineering, hs@denx.de.
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */
 #include <common.h>
 #include <nand.h>
 #include <ns16550.h>
 #include <post.h>
 #include <asm/arch/da850_lowlevel.h>
 #include <asm/arch/hardware.h>
 #include <asm/arch/davinci_misc.h>
 #include <asm/arch/ddr2_defs.h>
 #include <asm/arch/emif_defs.h>
 #include <asm/arch/pll_defs.h>

 void davinci_enable_uart0(void)
 {
 	lpsc_on(DAVINCI_LPSC_UART0);

 	/* Bringup UART0 out of reset */
 	REG(UART0_PWREMU_MGMT) = 0x00006001;
 }

 #if defined(CONFIG_SYS_DA850_PLL_INIT)
 void da850_waitloop(unsigned long loopcnt)
 {
 	unsigned long	i;

 	for (i = 0; i < loopcnt; i++)
 		asm("   NOP");
 }

 int da850_pll_init(struct davinci_pllc_regs *reg, unsigned long pllmult)
 {
 	if (reg == davinci_pllc0_regs)
 		/* Unlock PLL registers. */
 		clrbits_le32(&davinci_syscfg_regs->cfgchip0, PLL_MASTER_LOCK);

 	/*
 	 * Set PLLENSRC '0',bit 5, PLL Enable(PLLEN) selection is controlled
 	 * through MMR
 	 */
 	clrbits_le32(&reg->pllctl, PLLCTL_PLLENSRC);
 	/* PLLCTL.EXTCLKSRC bit 9 should be left at 0 for Freon */
 	clrbits_le32(&reg->pllctl, PLLCTL_EXTCLKSRC);

 	/* Set PLLEN=0 => PLL BYPASS MODE */
 	clrbits_le32(&reg->pllctl, PLLCTL_PLLEN);

 	da850_waitloop(150);

 	if (reg == davinci_pllc0_regs) {
 		/*
 		 * Select the Clock Mode bit 8 as External Clock or On Chip
 		 * Oscilator
 		 */
 		dv_maskbits(&reg->pllctl, ~PLLCTL_RES_9);
 		setbits_le32(&reg->pllctl,
 			(CONFIG_SYS_DV_CLKMODE << PLLCTL_CLOCK_MODE_SHIFT));
 	}

 	/* Clear PLLRST bit to reset the PLL */
 	clrbits_le32(&reg->pllctl, PLLCTL_PLLRST);

 	/* Disable the PLL output */
 	setbits_le32(&reg->pllctl, PLLCTL_PLLDIS);

 	/* PLL initialization sequence */
 	/*
 	 * Power up the PLL- PWRDN bit set to 0 to bring the PLL out of
 	 * power down bit
 	 */
 	clrbits_le32(&reg->pllctl, PLLCTL_PLLPWRDN);

 	/* Enable the PLL from Disable Mode PLLDIS bit to 0 */
 	clrbits_le32(&reg->pllctl, PLLCTL_PLLDIS);

 #if defined(CONFIG_SYS_DA850_PLL0_PREDIV)
 	/* program the prediv */
 	if (reg == davinci_pllc0_regs && CONFIG_SYS_DA850_PLL0_PREDIV)
 		writel((PLL_DIVEN | CONFIG_SYS_DA850_PLL0_PREDIV),
 			&reg->prediv);
 #endif

 	/* Program the required multiplier value in PLLM */
 	writel(pllmult, &reg->pllm);

 	/* program the postdiv */
 	if (reg == davinci_pllc0_regs)
 		writel((PLL_POSTDEN | CONFIG_SYS_DA850_PLL0_POSTDIV),
 			&reg->postdiv);
 	else
 		writel((PLL_POSTDEN | CONFIG_SYS_DA850_PLL1_POSTDIV),
 			&reg->postdiv);

 	/*
 	 * Check for the GOSTAT bit in PLLSTAT to clear to 0 to indicate that
 	 * no GO operation is currently in progress
 	 */
 	while ((readl(&reg->pllstat) & PLLCMD_GOSTAT) == PLLCMD_GOSTAT)
 		;

 	if (reg == davinci_pllc0_regs) {
 		writel(CONFIG_SYS_DA850_PLL0_PLLDIV1, &reg->plldiv1);
 		writel(CONFIG_SYS_DA850_PLL0_PLLDIV2, &reg->plldiv2);
 		writel(CONFIG_SYS_DA850_PLL0_PLLDIV3, &reg->plldiv3);
 		writel(CONFIG_SYS_DA850_PLL0_PLLDIV4, &reg->plldiv4);
 		writel(CONFIG_SYS_DA850_PLL0_PLLDIV5, &reg->plldiv5);
 		writel(CONFIG_SYS_DA850_PLL0_PLLDIV6, &reg->plldiv6);
 		writel(CONFIG_SYS_DA850_PLL0_PLLDIV7, &reg->plldiv7);
 	} else {
 		writel(CONFIG_SYS_DA850_PLL1_PLLDIV1, &reg->plldiv1);
 		writel(CONFIG_SYS_DA850_PLL1_PLLDIV2, &reg->plldiv2);
 		writel(CONFIG_SYS_DA850_PLL1_PLLDIV3, &reg->plldiv3);
 	}

 	/*
 	 * Set the GOSET bit in PLLCMD to 1 to initiate a new divider
 	 * transition.
 	 */
 	setbits_le32(&reg->pllcmd, PLLCMD_GOSTAT);

 	/*
 	 * Wait for the GOSTAT bit in PLLSTAT to clear to 0
 	 * (completion of phase alignment).
 	 */
 	while ((readl(&reg->pllstat) & PLLCMD_GOSTAT) == PLLCMD_GOSTAT)
 		;

 	/* Wait for PLL to reset properly. See PLL spec for PLL reset time */
 	da850_waitloop(200);

 	/* Set the PLLRST bit in PLLCTL to 1 to bring the PLL out of reset */
 	setbits_le32(&reg->pllctl, PLLCTL_PLLRST);

 	/* Wait for PLL to lock. See PLL spec for PLL lock time */
 	da850_waitloop(2400);

 	/*
 	 * Set the PLLEN bit in PLLCTL to 1 to remove the PLL from bypass
 	 * mode
 	 */
 	setbits_le32(&reg->pllctl, PLLCTL_PLLEN);


 	/*
 	 * clear EMIFA and EMIFB clock source settings, let them
 	 * run off SYSCLK
 	 */
 	if (reg == davinci_pllc0_regs)
 		dv_maskbits(&davinci_syscfg_regs->cfgchip3,
 			~(PLL_SCSCFG3_DIV45PENA | PLL_SCSCFG3_EMA_CLKSRC));

 	return 0;
 }
 #endif /* CONFIG_SYS_DA850_PLL_INIT */

 #if defined(CONFIG_SYS_DA850_DDR_INIT)
 int da850_ddr_setup(void)
 {
 	unsigned long	tmp;

 	/* Enable the Clock to DDR2/mDDR */
 	lpsc_on(DAVINCI_LPSC_DDR_EMIF);

 	tmp = readl(&davinci_syscfg1_regs->vtpio_ctl);
 	if ((tmp & VTP_POWERDWN) == VTP_POWERDWN) {
 		/* Begin VTP Calibration */
 		clrbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_POWERDWN);
 		clrbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_LOCK);
 		setbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_CLKRZ);
 		clrbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_CLKRZ);
 		setbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_CLKRZ);

 		/* Polling READY bit to see when VTP calibration is done */
 		tmp = readl(&davinci_syscfg1_regs->vtpio_ctl);
 		while ((tmp & VTP_READY) != VTP_READY)
 			tmp = readl(&davinci_syscfg1_regs->vtpio_ctl);

 		setbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_LOCK);
 		setbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_POWERDWN);
 	}
 	setbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_IOPWRDWN);
 	writel(CONFIG_SYS_DA850_DDR2_DDRPHYCR, &dv_ddr2_regs_ctrl->ddrphycr);

 	if (CONFIG_SYS_DA850_DDR2_SDBCR & (1 << DV_DDR_SDCR_DDR2EN_SHIFT)) {
 		/* DDR2 */
 		clrbits_le32(&davinci_syscfg1_regs->ddr_slew,
 			(1 << DDR_SLEW_DDR_PDENA_BIT) |
 			(1 << DDR_SLEW_CMOSEN_BIT));
 	} else {
 		/* MOBILE DDR */
 		setbits_le32(&davinci_syscfg1_regs->ddr_slew,
 			(1 << DDR_SLEW_DDR_PDENA_BIT) |
 			(1 << DDR_SLEW_CMOSEN_BIT));
 	}

 	/*
 	 * SDRAM Configuration Register (SDCR):
 	 * First set the BOOTUNLOCK bit to make configuration bits
 	 * writeable.
 	 */
 	setbits_le32(&dv_ddr2_regs_ctrl->sdbcr, DV_DDR_BOOTUNLOCK);

 	/*
 	 * Write the new value of these bits and clear BOOTUNLOCK.
 	 * At the same time, set the TIMUNLOCK bit to allow changing
 	 * the timing registers
 	 */
 	tmp = CONFIG_SYS_DA850_DDR2_SDBCR;
 	tmp &= ~DV_DDR_BOOTUNLOCK;
 	tmp |= DV_DDR_TIMUNLOCK;
 	writel(tmp, &dv_ddr2_regs_ctrl->sdbcr);

 	/* write memory configuration and timing */
 	if (!(CONFIG_SYS_DA850_DDR2_SDBCR & (1 << DV_DDR_SDCR_DDR2EN_SHIFT))) {
 		/* MOBILE DDR only*/
 		writel(CONFIG_SYS_DA850_DDR2_SDBCR2,
 			&dv_ddr2_regs_ctrl->sdbcr2);
 	}
 	writel(CONFIG_SYS_DA850_DDR2_SDTIMR, &dv_ddr2_regs_ctrl->sdtimr);
 	writel(CONFIG_SYS_DA850_DDR2_SDTIMR2, &dv_ddr2_regs_ctrl->sdtimr2);

 	/* clear the TIMUNLOCK bit and write the value of the CL field */
 	tmp &= ~DV_DDR_TIMUNLOCK;
 	writel(tmp, &dv_ddr2_regs_ctrl->sdbcr);

 	/*
 	 * LPMODEN and MCLKSTOPEN must be set!
 	 * Without this bits set, PSC don;t switch states !!
 	 */
 	writel(CONFIG_SYS_DA850_DDR2_SDRCR |
 		(1 << DV_DDR_SRCR_LPMODEN_SHIFT) |
 		(1 << DV_DDR_SRCR_MCLKSTOPEN_SHIFT),
 		&dv_ddr2_regs_ctrl->sdrcr);

 	/* SyncReset the Clock to EMIF3A SDRAM */
 	lpsc_syncreset(DAVINCI_LPSC_DDR_EMIF);
 	/* Enable the Clock to EMIF3A SDRAM */
 	lpsc_on(DAVINCI_LPSC_DDR_EMIF);

 	/* disable self refresh */
 	clrbits_le32(&dv_ddr2_regs_ctrl->sdrcr,
 		DV_DDR_SDRCR_LPMODEN | DV_DDR_SDRCR_MCLKSTOPEN);
 	writel(CONFIG_SYS_DA850_DDR2_PBBPR, &dv_ddr2_regs_ctrl->pbbpr);

 	return 0;
 }
 #endif /* CONFIG_SYS_DA850_DDR_INIT */

 __attribute__((weak))
 void board_gpio_init(void)
 {
 	return;
 }

 int arch_cpu_init(void)
 {
 	/* Unlock kick registers */
 	writel(DV_SYSCFG_KICK0_UNLOCK, &davinci_syscfg_regs->kick0);
 	writel(DV_SYSCFG_KICK1_UNLOCK, &davinci_syscfg_regs->kick1);

 	dv_maskbits(&davinci_syscfg_regs->suspsrc,
 		CONFIG_SYS_DA850_SYSCFG_SUSPSRC);

 	/* configure pinmux settings */
 	if (davinci_configure_pin_mux_items(pinmuxes, pinmuxes_size))
 		return 1;

 #if defined(CONFIG_SYS_DA850_PLL_INIT)
 	/* PLL setup */
 	da850_pll_init(davinci_pllc0_regs, CONFIG_SYS_DA850_PLL0_PLLM);
 	da850_pll_init(davinci_pllc1_regs, CONFIG_SYS_DA850_PLL1_PLLM);
 #endif
 	/* setup CSn config */
 #if defined(CONFIG_SYS_DA850_CS2CFG)
 	writel(CONFIG_SYS_DA850_CS2CFG, &davinci_emif_regs->ab1cr);
 #endif
 #if defined(CONFIG_SYS_DA850_CS3CFG)
 	writel(CONFIG_SYS_DA850_CS3CFG, &davinci_emif_regs->ab2cr);
 #endif

 	da8xx_configure_lpsc_items(lpsc, lpsc_size);

 	/* GPIO setup */
 	board_gpio_init();


 	NS16550_init((NS16550_t)(CONFIG_SYS_NS16550_COM1),
 			CONFIG_SYS_NS16550_CLK / 16 / CONFIG_BAUDRATE);

 	/*
 	 * Fix Power and Emulation Management Register
 	 * see sprufw3a.pdf page 37 Table 24
 	 */
 	writel((DAVINCI_UART_PWREMU_MGMT_FREE | DAVINCI_UART_PWREMU_MGMT_URRST |
 		DAVINCI_UART_PWREMU_MGMT_UTRST),
 #if (CONFIG_SYS_NS16550_COM1 == DAVINCI_UART0_BASE)
 	       &davinci_uart0_ctrl_regs->pwremu_mgmt);
 #else
 	       &davinci_uart2_ctrl_regs->pwremu_mgmt);
 #endif

 #if defined(CONFIG_SYS_DA850_DDR_INIT)
 	da850_ddr_setup();
 #endif

 	return 0;
 }
	/*
	* SoC-specific lowlevel code for DA850
	*
	* Copyright (C) 2011
	* Heiko Schocher, DENX Software Engineering, hs@denx.de.
	*
	* SPDX-License-Identifier: GPL-2.0+
	*/
	#include <common.h>
	#include <nand.h>
	#include <ns16550.h>
	#include <post.h>
	#include <asm/arch/da850_lowlevel.h>
	#include <asm/arch/hardware.h>
	#include <asm/arch/davinci_misc.h>
	#include <asm/arch/ddr2_defs.h>
	#include <asm/arch/emif_defs.h>
	#include <asm/arch/pll_defs.h>

	void davinci_enable_uart0(void)
	{
	lpsc_on(DAVINCI_LPSC_UART0);

	/* Bringup UART0 out of reset */
	REG(UART0_PWREMU_MGMT) = 0x00006001;
	}

	#if defined(CONFIG_SYS_DA850_PLL_INIT)
	void da850_waitloop(unsigned long loopcnt)
	{
	unsigned long i;

	for (i = 0; i < loopcnt; i++)
	asm(" NOP");
	}

	int da850_pll_init(struct davinci_pllc_regs *reg, unsigned long pllmult)
	{
	if (reg == davinci_pllc0_regs)
	/* Unlock PLL registers. */
	clrbits_le32(&davinci_syscfg_regs->cfgchip0, PLL_MASTER_LOCK);

	/*
	* Set PLLENSRC '0',bit 5, PLL Enable(PLLEN) selection is controlled
	* through MMR
	*/
	clrbits_le32(&reg->pllctl, PLLCTL_PLLENSRC);
	/* PLLCTL.EXTCLKSRC bit 9 should be left at 0 for Freon */
	clrbits_le32(&reg->pllctl, PLLCTL_EXTCLKSRC);

	/* Set PLLEN=0 => PLL BYPASS MODE */
	clrbits_le32(&reg->pllctl, PLLCTL_PLLEN);

	da850_waitloop(150);

	if (reg == davinci_pllc0_regs) {
	/*
	* Select the Clock Mode bit 8 as External Clock or On Chip
	* Oscilator
	*/
	dv_maskbits(&reg->pllctl, ~PLLCTL_RES_9);
	setbits_le32(&reg->pllctl,
	(CONFIG_SYS_DV_CLKMODE << PLLCTL_CLOCK_MODE_SHIFT));
	}

	/* Clear PLLRST bit to reset the PLL */
	clrbits_le32(&reg->pllctl, PLLCTL_PLLRST);

	/* Disable the PLL output */
	setbits_le32(&reg->pllctl, PLLCTL_PLLDIS);

	/* PLL initialization sequence */
	/*
	* Power up the PLL- PWRDN bit set to 0 to bring the PLL out of
	* power down bit
	*/
	clrbits_le32(&reg->pllctl, PLLCTL_PLLPWRDN);

	/* Enable the PLL from Disable Mode PLLDIS bit to 0 */
	clrbits_le32(&reg->pllctl, PLLCTL_PLLDIS);

	#if defined(CONFIG_SYS_DA850_PLL0_PREDIV)
	/* program the prediv */
	if (reg == davinci_pllc0_regs && CONFIG_SYS_DA850_PLL0_PREDIV)
	writel((PLL_DIVEN \| CONFIG_SYS_DA850_PLL0_PREDIV),
	&reg->prediv);
	#endif

	/* Program the required multiplier value in PLLM */
	writel(pllmult, &reg->pllm);

	/* program the postdiv */
	if (reg == davinci_pllc0_regs)
	writel((PLL_POSTDEN \| CONFIG_SYS_DA850_PLL0_POSTDIV),
	&reg->postdiv);
	else
	writel((PLL_POSTDEN \| CONFIG_SYS_DA850_PLL1_POSTDIV),
	&reg->postdiv);

	/*
	* Check for the GOSTAT bit in PLLSTAT to clear to 0 to indicate that
	* no GO operation is currently in progress
	*/
	while ((readl(&reg->pllstat) & PLLCMD_GOSTAT) == PLLCMD_GOSTAT)
	;

	if (reg == davinci_pllc0_regs) {
	writel(CONFIG_SYS_DA850_PLL0_PLLDIV1, &reg->plldiv1);
	writel(CONFIG_SYS_DA850_PLL0_PLLDIV2, &reg->plldiv2);
	writel(CONFIG_SYS_DA850_PLL0_PLLDIV3, &reg->plldiv3);
	writel(CONFIG_SYS_DA850_PLL0_PLLDIV4, &reg->plldiv4);
	writel(CONFIG_SYS_DA850_PLL0_PLLDIV5, &reg->plldiv5);
	writel(CONFIG_SYS_DA850_PLL0_PLLDIV6, &reg->plldiv6);
	writel(CONFIG_SYS_DA850_PLL0_PLLDIV7, &reg->plldiv7);
	} else {
	writel(CONFIG_SYS_DA850_PLL1_PLLDIV1, &reg->plldiv1);
	writel(CONFIG_SYS_DA850_PLL1_PLLDIV2, &reg->plldiv2);
	writel(CONFIG_SYS_DA850_PLL1_PLLDIV3, &reg->plldiv3);
	}

	/*
	* Set the GOSET bit in PLLCMD to 1 to initiate a new divider
	* transition.
	*/
	setbits_le32(&reg->pllcmd, PLLCMD_GOSTAT);

	/*
	* Wait for the GOSTAT bit in PLLSTAT to clear to 0
	* (completion of phase alignment).
	*/
	while ((readl(&reg->pllstat) & PLLCMD_GOSTAT) == PLLCMD_GOSTAT)
	;

	/* Wait for PLL to reset properly. See PLL spec for PLL reset time */
	da850_waitloop(200);

	/* Set the PLLRST bit in PLLCTL to 1 to bring the PLL out of reset */
	setbits_le32(&reg->pllctl, PLLCTL_PLLRST);

	/* Wait for PLL to lock. See PLL spec for PLL lock time */
	da850_waitloop(2400);

	/*
	* Set the PLLEN bit in PLLCTL to 1 to remove the PLL from bypass
	* mode
	*/
	setbits_le32(&reg->pllctl, PLLCTL_PLLEN);


	/*
	* clear EMIFA and EMIFB clock source settings, let them
	* run off SYSCLK
	*/
	if (reg == davinci_pllc0_regs)
	dv_maskbits(&davinci_syscfg_regs->cfgchip3,
	~(PLL_SCSCFG3_DIV45PENA \| PLL_SCSCFG3_EMA_CLKSRC));

	return 0;
	}
	#endif /* CONFIG_SYS_DA850_PLL_INIT */

	#if defined(CONFIG_SYS_DA850_DDR_INIT)
	int da850_ddr_setup(void)
	{
	unsigned long tmp;

	/* Enable the Clock to DDR2/mDDR */
	lpsc_on(DAVINCI_LPSC_DDR_EMIF);

	tmp = readl(&davinci_syscfg1_regs->vtpio_ctl);
	if ((tmp & VTP_POWERDWN) == VTP_POWERDWN) {
	/* Begin VTP Calibration */
	clrbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_POWERDWN);
	clrbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_LOCK);
	setbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_CLKRZ);
	clrbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_CLKRZ);
	setbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_CLKRZ);

	/* Polling READY bit to see when VTP calibration is done */
	tmp = readl(&davinci_syscfg1_regs->vtpio_ctl);
	while ((tmp & VTP_READY) != VTP_READY)
	tmp = readl(&davinci_syscfg1_regs->vtpio_ctl);

	setbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_LOCK);
	setbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_POWERDWN);
	}
	setbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_IOPWRDWN);
	writel(CONFIG_SYS_DA850_DDR2_DDRPHYCR, &dv_ddr2_regs_ctrl->ddrphycr);

	if (CONFIG_SYS_DA850_DDR2_SDBCR & (1 << DV_DDR_SDCR_DDR2EN_SHIFT)) {
	/* DDR2 */
	clrbits_le32(&davinci_syscfg1_regs->ddr_slew,
	(1 << DDR_SLEW_DDR_PDENA_BIT) \|
	(1 << DDR_SLEW_CMOSEN_BIT));
	} else {
	/* MOBILE DDR */
	setbits_le32(&davinci_syscfg1_regs->ddr_slew,
	(1 << DDR_SLEW_DDR_PDENA_BIT) \|
	(1 << DDR_SLEW_CMOSEN_BIT));
	}

	/*
	* SDRAM Configuration Register (SDCR):
	* First set the BOOTUNLOCK bit to make configuration bits
	* writeable.
	*/
	setbits_le32(&dv_ddr2_regs_ctrl->sdbcr, DV_DDR_BOOTUNLOCK);

	/*
	* Write the new value of these bits and clear BOOTUNLOCK.
	* At the same time, set the TIMUNLOCK bit to allow changing
	* the timing registers
	*/
	tmp = CONFIG_SYS_DA850_DDR2_SDBCR;
	tmp &= ~DV_DDR_BOOTUNLOCK;
	tmp \|= DV_DDR_TIMUNLOCK;
	writel(tmp, &dv_ddr2_regs_ctrl->sdbcr);

	/* write memory configuration and timing */
	if (!(CONFIG_SYS_DA850_DDR2_SDBCR & (1 << DV_DDR_SDCR_DDR2EN_SHIFT))) {
	/* MOBILE DDR only*/
	writel(CONFIG_SYS_DA850_DDR2_SDBCR2,
	&dv_ddr2_regs_ctrl->sdbcr2);
	}
	writel(CONFIG_SYS_DA850_DDR2_SDTIMR, &dv_ddr2_regs_ctrl->sdtimr);
	writel(CONFIG_SYS_DA850_DDR2_SDTIMR2, &dv_ddr2_regs_ctrl->sdtimr2);

	/* clear the TIMUNLOCK bit and write the value of the CL field */
	tmp &= ~DV_DDR_TIMUNLOCK;
	writel(tmp, &dv_ddr2_regs_ctrl->sdbcr);

	/*
	* LPMODEN and MCLKSTOPEN must be set!
	* Without this bits set, PSC don;t switch states !!
	*/
	writel(CONFIG_SYS_DA850_DDR2_SDRCR \|
	(1 << DV_DDR_SRCR_LPMODEN_SHIFT) \|
	(1 << DV_DDR_SRCR_MCLKSTOPEN_SHIFT),
	&dv_ddr2_regs_ctrl->sdrcr);

	/* SyncReset the Clock to EMIF3A SDRAM */
	lpsc_syncreset(DAVINCI_LPSC_DDR_EMIF);
	/* Enable the Clock to EMIF3A SDRAM */
	lpsc_on(DAVINCI_LPSC_DDR_EMIF);

	/* disable self refresh */
	clrbits_le32(&dv_ddr2_regs_ctrl->sdrcr,
	DV_DDR_SDRCR_LPMODEN \| DV_DDR_SDRCR_MCLKSTOPEN);
	writel(CONFIG_SYS_DA850_DDR2_PBBPR, &dv_ddr2_regs_ctrl->pbbpr);

	return 0;
	}
	#endif /* CONFIG_SYS_DA850_DDR_INIT */

	__attribute__((weak))
	void board_gpio_init(void)
	{
	return;
	}

	int arch_cpu_init(void)
	{
	/* Unlock kick registers */
	writel(DV_SYSCFG_KICK0_UNLOCK, &davinci_syscfg_regs->kick0);
	writel(DV_SYSCFG_KICK1_UNLOCK, &davinci_syscfg_regs->kick1);

	dv_maskbits(&davinci_syscfg_regs->suspsrc,
	CONFIG_SYS_DA850_SYSCFG_SUSPSRC);

	/* configure pinmux settings */
	if (davinci_configure_pin_mux_items(pinmuxes, pinmuxes_size))
	return 1;

	#if defined(CONFIG_SYS_DA850_PLL_INIT)
	/* PLL setup */
	da850_pll_init(davinci_pllc0_regs, CONFIG_SYS_DA850_PLL0_PLLM);
	da850_pll_init(davinci_pllc1_regs, CONFIG_SYS_DA850_PLL1_PLLM);
	#endif
	/* setup CSn config */
	#if defined(CONFIG_SYS_DA850_CS2CFG)
	writel(CONFIG_SYS_DA850_CS2CFG, &davinci_emif_regs->ab1cr);
	#endif
	#if defined(CONFIG_SYS_DA850_CS3CFG)
	writel(CONFIG_SYS_DA850_CS3CFG, &davinci_emif_regs->ab2cr);
	#endif

	da8xx_configure_lpsc_items(lpsc, lpsc_size);

	/* GPIO setup */
	board_gpio_init();


	NS16550_init((NS16550_t)(CONFIG_SYS_NS16550_COM1),
	CONFIG_SYS_NS16550_CLK / 16 / CONFIG_BAUDRATE);

	/*
	* Fix Power and Emulation Management Register
	* see sprufw3a.pdf page 37 Table 24
	*/
	writel((DAVINCI_UART_PWREMU_MGMT_FREE \| DAVINCI_UART_PWREMU_MGMT_URRST \|
	DAVINCI_UART_PWREMU_MGMT_UTRST),
	#if (CONFIG_SYS_NS16550_COM1 == DAVINCI_UART0_BASE)
	&davinci_uart0_ctrl_regs->pwremu_mgmt);
	#else
	&davinci_uart2_ctrl_regs->pwremu_mgmt);
	#endif

	#if defined(CONFIG_SYS_DA850_DDR_INIT)
	da850_ddr_setup();
	#endif

	return 0;
	}