arch/arm/cpu/arm1136/mx35/generic.c - boot/u-boot-linaro-stable - Git at Google

 /*
  * (C) Copyright 2007
  * Sascha Hauer, Pengutronix
  *
  * (C) Copyright 2008-2010 Freescale Semiconductor, Inc.
  *
  * 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 <div64.h>
 #include <asm/io.h>
 #include <asm/errno.h>
 #include <asm/arch/imx-regs.h>
 #include <asm/arch/crm_regs.h>
 #include <asm/arch/clock.h>
 #include <asm/arch/sys_proto.h>
 #ifdef CONFIG_FSL_ESDHC
 #include <fsl_esdhc.h>
 #endif
 #include <netdev.h>

 #define CLK_CODE(arm, ahb, sel) (((arm) << 16) + ((ahb) << 8) + (sel))
 #define CLK_CODE_ARM(c)		(((c) >> 16) & 0xFF)
 #define CLK_CODE_AHB(c)		(((c) >>  8) & 0xFF)
 #define CLK_CODE_PATH(c)	((c) & 0xFF)

 #define CCM_GET_DIVIDER(x, m, o) (((x) & (m)) >> (o))

 #ifdef CONFIG_FSL_ESDHC
 DECLARE_GLOBAL_DATA_PTR;
 #endif

 static int g_clk_mux_auto[8] = {
 	CLK_CODE(1, 3, 0), CLK_CODE(1, 2, 1), CLK_CODE(2, 1, 1), -1,
 	CLK_CODE(1, 6, 0), CLK_CODE(1, 4, 1), CLK_CODE(2, 2, 1), -1,
 };

 static int g_clk_mux_consumer[16] = {
 	CLK_CODE(1, 4, 0), CLK_CODE(1, 3, 1), CLK_CODE(1, 3, 1), -1,
 	-1, -1, CLK_CODE(4, 1, 0), CLK_CODE(1, 5, 0),
 	CLK_CODE(1, 8, 1), CLK_CODE(1, 6, 1), CLK_CODE(2, 4, 0), -1,
 	-1, -1, CLK_CODE(4, 2, 0), -1,
 };

 static int hsp_div_table[3][16] = {
 	{4, 3, 2, -1, -1, -1, 1, 5, 4, 3, 2, -1, -1, -1, 1, -1},
 	{-1, -1, -1, -1, -1, -1, -1, -1, 8, 6, 4, -1, -1, -1, 2, -1},
 	{3, -1, -1, -1, -1, -1, -1, -1, 3, -1, -1, -1, -1, -1, -1, -1},
 };

 u32 get_cpu_rev(void)
 {
 	int reg;
 	struct iim_regs *iim =
 		(struct iim_regs *)IIM_BASE_ADDR;
 	reg = readl(&iim->iim_srev);
 	if (!reg) {
 		reg = readw(ROMPATCH_REV);
 		reg <<= 4;
 	} else {
 		reg += CHIP_REV_1_0;
 	}

 	return 0x35000 + (reg & 0xFF);
 }

 static u32 get_arm_div(u32 pdr0, u32 *fi, u32 *fd)
 {
 	int *pclk_mux;
 	if (pdr0 & MXC_CCM_PDR0_AUTO_CON) {
 		pclk_mux = g_clk_mux_consumer +
 			((pdr0 & MXC_CCM_PDR0_CON_MUX_DIV_MASK) >>
 			MXC_CCM_PDR0_CON_MUX_DIV_OFFSET);
 	} else {
 		pclk_mux = g_clk_mux_auto +
 			((pdr0 & MXC_CCM_PDR0_AUTO_MUX_DIV_MASK) >>
 			MXC_CCM_PDR0_AUTO_MUX_DIV_OFFSET);
 	}

 	if ((*pclk_mux) == -1)
 		return -1;

 	if (fi && fd) {
 		if (!CLK_CODE_PATH(*pclk_mux)) {
 			*fi = *fd = 1;
 			return CLK_CODE_ARM(*pclk_mux);
 		}
 		if (pdr0 & MXC_CCM_PDR0_AUTO_CON) {
 			*fi = 3;
 			*fd = 4;
 		} else {
 			*fi = 2;
 			*fd = 3;
 		}
 	}
 	return CLK_CODE_ARM(*pclk_mux);
 }

 static int get_ahb_div(u32 pdr0)
 {
 	int *pclk_mux;

 	pclk_mux = g_clk_mux_consumer +
 		((pdr0 & MXC_CCM_PDR0_CON_MUX_DIV_MASK) >>
 		MXC_CCM_PDR0_CON_MUX_DIV_OFFSET);

 	if ((*pclk_mux) == -1)
 		return -1;

 	return CLK_CODE_AHB(*pclk_mux);
 }

 static u32 decode_pll(u32 reg, u32 infreq)
 {
 	u32 mfi = (reg >> 10) & 0xf;
 	s32 mfn = reg & 0x3ff;
 	u32 mfd = (reg >> 16) & 0x3ff;
 	u32 pd = (reg >> 26) & 0xf;

 	mfi = mfi <= 5 ? 5 : mfi;
 	mfn = mfn >= 512 ? mfn - 1024 : mfn;
 	mfd += 1;
 	pd += 1;

 	return lldiv(2 * (u64)infreq * (mfi * mfd + mfn),
 		mfd * pd);
 }

 static u32 get_mcu_main_clk(void)
 {
 	u32 arm_div = 0, fi = 0, fd = 0;
 	struct ccm_regs *ccm =
 		(struct ccm_regs *)IMX_CCM_BASE;
 	arm_div = get_arm_div(readl(&ccm->pdr0), &fi, &fd);
 	fi *= decode_pll(readl(&ccm->mpctl), MXC_HCLK);
 	return fi / (arm_div * fd);
 }

 static u32 get_ipg_clk(void)
 {
 	u32 freq = get_mcu_main_clk();
 	struct ccm_regs *ccm =
 		(struct ccm_regs *)IMX_CCM_BASE;
 	u32 pdr0 = readl(&ccm->pdr0);

 	return freq / (get_ahb_div(pdr0) * 2);
 }

 static u32 get_ipg_per_clk(void)
 {
 	u32 freq = get_mcu_main_clk();
 	struct ccm_regs *ccm =
 		(struct ccm_regs *)IMX_CCM_BASE;
 	u32 pdr0 = readl(&ccm->pdr0);
 	u32 pdr4 = readl(&ccm->pdr4);
 	u32 div;
 	if (pdr0 & MXC_CCM_PDR0_PER_SEL) {
 		div = CCM_GET_DIVIDER(pdr4,
 			MXC_CCM_PDR4_PER0_PODF_MASK,
 			MXC_CCM_PDR4_PER0_PODF_OFFSET) + 1;
 	} else {
 		div = CCM_GET_DIVIDER(pdr0,
 			MXC_CCM_PDR0_PER_PODF_MASK,
 			MXC_CCM_PDR0_PER_PODF_OFFSET) + 1;
 		div *= get_ahb_div(pdr0);
 	}
 	return freq / div;
 }

 u32 imx_get_uartclk(void)
 {
 	u32 freq;
 	struct ccm_regs *ccm =
 		(struct ccm_regs *)IMX_CCM_BASE;
 	u32 pdr4 = readl(&ccm->pdr4);

 	if (readl(&ccm->pdr3) & MXC_CCM_PDR3_UART_M_U)
 		freq = get_mcu_main_clk();
 	else
 		freq = decode_pll(readl(&ccm->ppctl), MXC_HCLK);
 	freq /= CCM_GET_DIVIDER(pdr4,
 			MXC_CCM_PDR4_UART_PODF_MASK,
 			MXC_CCM_PDR4_UART_PODF_OFFSET) + 1;
 	return freq;
 }

 unsigned int mxc_get_main_clock(enum mxc_main_clock clk)
 {
 	u32 nfc_pdf, hsp_podf;
 	u32 pll, ret_val = 0, usb_podf;
 	struct ccm_regs *ccm =
 		(struct ccm_regs *)IMX_CCM_BASE;

 	u32 reg = readl(&ccm->pdr0);
 	u32 reg4 = readl(&ccm->pdr4);

 	reg |= 0x1;

 	switch (clk) {
 	case CPU_CLK:
 		ret_val = get_mcu_main_clk();
 		break;
 	case AHB_CLK:
 		ret_val = get_mcu_main_clk();
 		break;
 	case HSP_CLK:
 		if (reg & CLKMODE_CONSUMER) {
 			hsp_podf = (reg >> 20) & 0x3;
 			pll = get_mcu_main_clk();
 			hsp_podf = hsp_div_table[hsp_podf][(reg>>16)&0xF];
 			if (hsp_podf > 0) {
 				ret_val = pll / hsp_podf;
 			} else {
 				puts("mismatch HSP with ARM clock setting\n");
 				ret_val = 0;
 			}
 		} else {
 			ret_val = get_mcu_main_clk();
 		}
 		break;
 	case IPG_CLK:
 		ret_val = get_ipg_clk();
 		break;
 	case IPG_PER_CLK:
 		ret_val = get_ipg_per_clk();
 		break;
 	case NFC_CLK:
 		nfc_pdf = (reg4 >> 28) & 0xF;
 		pll = get_mcu_main_clk();
 		/* AHB/nfc_pdf */
 		ret_val = pll / (nfc_pdf + 1);
 		break;
 	case USB_CLK:
 		usb_podf = (reg4 >> 22) & 0x3F;
 		if (reg4 & 0x200)
 			pll = get_mcu_main_clk();
 		else
 			pll = decode_pll(readl(&ccm->ppctl), MXC_HCLK);

 		ret_val = pll / (usb_podf + 1);
 		break;
 	default:
 		printf("Unknown clock: %d\n", clk);
 		break;
 	}

 	return ret_val;
 }
 unsigned int mxc_get_peri_clock(enum mxc_peri_clock clk)
 {
 	u32 ret_val = 0, pdf, pre_pdf, clk_sel;
 	struct ccm_regs *ccm =
 		(struct ccm_regs *)IMX_CCM_BASE;
 	u32 mpdr2 = readl(&ccm->pdr2);
 	u32 mpdr3 = readl(&ccm->pdr3);
 	u32 mpdr4 = readl(&ccm->pdr4);

 	switch (clk) {
 	case UART1_BAUD:
 	case UART2_BAUD:
 	case UART3_BAUD:
 		clk_sel = mpdr3 & (1 << 14);
 		pdf = (mpdr4 >> 10) & 0x3F;
 		ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) :
 			decode_pll(readl(&ccm->ppctl), MXC_HCLK)) / (pdf + 1);
 		break;
 	case SSI1_BAUD:
 		pre_pdf = (mpdr2 >> 24) & 0x7;
 		pdf = mpdr2 & 0x3F;
 		clk_sel = mpdr2 & (1 << 6);
 		ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) :
 			decode_pll(readl(&ccm->ppctl), MXC_HCLK)) /
 				((pre_pdf + 1) * (pdf + 1));
 		break;
 	case SSI2_BAUD:
 		pre_pdf = (mpdr2 >> 27) & 0x7;
 		pdf = (mpdr2 >> 8) & 0x3F;
 		clk_sel = mpdr2 & (1 << 6);
 		ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) :
 			decode_pll(readl(&ccm->ppctl), MXC_HCLK)) /
 				((pre_pdf + 1) * (pdf + 1));
 		break;
 	case CSI_BAUD:
 		clk_sel = mpdr2 & (1 << 7);
 		pdf = (mpdr2 >> 16) & 0x3F;
 		ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) :
 			decode_pll(readl(&ccm->ppctl), MXC_HCLK)) / (pdf + 1);
 		break;
 	case MSHC_CLK:
 		pre_pdf = readl(&ccm->pdr1);
 		clk_sel = (pre_pdf & 0x80);
 		pdf = (pre_pdf >> 22) & 0x3F;
 		pre_pdf = (pre_pdf >> 28) & 0x7;
 		ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) :
 			decode_pll(readl(&ccm->ppctl), MXC_HCLK)) /
 				((pre_pdf + 1) * (pdf + 1));
 		break;
 	case ESDHC1_CLK:
 		clk_sel = mpdr3 & 0x40;
 		pdf = mpdr3 & 0x3F;
 		ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) :
 			decode_pll(readl(&ccm->ppctl), MXC_HCLK)) / (pdf + 1);
 		break;
 	case ESDHC2_CLK:
 		clk_sel = mpdr3 & 0x40;
 		pdf = (mpdr3 >> 8) & 0x3F;
 		ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) :
 			decode_pll(readl(&ccm->ppctl), MXC_HCLK)) / (pdf + 1);
 		break;
 	case ESDHC3_CLK:
 		clk_sel = mpdr3 & 0x40;
 		pdf = (mpdr3 >> 16) & 0x3F;
 		ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) :
 			decode_pll(readl(&ccm->ppctl), MXC_HCLK)) / (pdf + 1);
 		break;
 	case SPDIF_CLK:
 		clk_sel = mpdr3 & 0x400000;
 		pre_pdf = (mpdr3 >> 29) & 0x7;
 		pdf = (mpdr3 >> 23) & 0x3F;
 		ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) :
 			decode_pll(readl(&ccm->ppctl), MXC_HCLK)) /
 				((pre_pdf + 1) * (pdf + 1));
 		break;
 	default:
 		printf("%s(): This clock: %d not supported yet\n",
 				__func__, clk);
 		break;
 	}

 	return ret_val;
 }

 unsigned int mxc_get_clock(enum mxc_clock clk)
 {
 	switch (clk) {
 	case MXC_ARM_CLK:
 		return get_mcu_main_clk();
 	case MXC_AHB_CLK:
 		break;
 	case MXC_IPG_CLK:
 		return get_ipg_clk();
 	case MXC_IPG_PERCLK:
 	case MXC_I2C_CLK:
 		return get_ipg_per_clk();
 	case MXC_UART_CLK:
 		return imx_get_uartclk();
 	case MXC_ESDHC_CLK:
 		return mxc_get_peri_clock(ESDHC1_CLK);
 	case MXC_USB_CLK:
 		return mxc_get_main_clock(USB_CLK);
 	case MXC_FEC_CLK:
 		return get_ipg_clk();
 	case MXC_CSPI_CLK:
 		return get_ipg_clk();
 	}
 	return -1;
 }

 #ifdef CONFIG_FEC_MXC
 /*
  * The MX35 has no fuse for MAC, return a NULL MAC
  */
 void imx_get_mac_from_fuse(int dev_id, unsigned char *mac)
 {
 	memset(mac, 0, 6);
 }

 u32 imx_get_fecclk(void)
 {
 	return mxc_get_clock(MXC_IPG_CLK);
 }
 #endif

 int do_mx35_showclocks(cmd_tbl_t *cmdtp,
 	int flag, int argc, char * const argv[])
 {
 	u32 cpufreq = get_mcu_main_clk();
 	printf("mx35 cpu clock: %dMHz\n", cpufreq / 1000000);
 	printf("ipg clock     : %dHz\n", get_ipg_clk());
 	printf("ipg per clock : %dHz\n", get_ipg_per_clk());
 	printf("uart clock    : %dHz\n", mxc_get_clock(MXC_UART_CLK));

 	return 0;
 }

 U_BOOT_CMD(
 	clocks,	CONFIG_SYS_MAXARGS, 1, do_mx35_showclocks,
 	"display clocks",
 	""
 );

 #if defined(CONFIG_DISPLAY_CPUINFO)
 static char *get_reset_cause(void)
 {
 	/* read RCSR register from CCM module */
 	struct ccm_regs *ccm =
 		(struct ccm_regs *)IMX_CCM_BASE;

 	u32 cause = readl(&ccm->rcsr) & 0x0F;

 	switch (cause) {
 	case 0x0000:
 		return "POR";
 	case 0x0002:
 		return "JTAG";
 	case 0x0004:
 		return "RST";
 	case 0x0008:
 		return "WDOG";
 	default:
 		return "unknown reset";
 	}
 }

 int print_cpuinfo(void)
 {
 	u32 srev = get_cpu_rev();

 	printf("CPU:   Freescale i.MX35 rev %d.%d at %d MHz.\n",
 		(srev & 0xF0) >> 4, (srev & 0x0F),
 		get_mcu_main_clk() / 1000000);

 	printf("Reset cause: %s\n", get_reset_cause());

 	return 0;
 }
 #endif

 /*
  * Initializes on-chip ethernet controllers.
  * to override, implement board_eth_init()
  */
 int cpu_eth_init(bd_t *bis)
 {
 	int rc = -ENODEV;

 #if defined(CONFIG_FEC_MXC)
 	rc = fecmxc_initialize(bis);
 #endif

 	return rc;
 }

 #ifdef CONFIG_FSL_ESDHC
 /*
  * Initializes on-chip MMC controllers.
  * to override, implement board_mmc_init()
  */
 int cpu_mmc_init(bd_t *bis)
 {
 	return fsl_esdhc_mmc_init(bis);
 }
 #endif

 int get_clocks(void)
 {
 #ifdef CONFIG_FSL_ESDHC
 	gd->sdhc_clk = mxc_get_clock(MXC_ESDHC_CLK);
 #endif
 	return 0;
 }

 void reset_cpu(ulong addr)
 {
 	struct wdog_regs *wdog = (struct wdog_regs *)WDOG_BASE_ADDR;
 	writew(4, &wdog->wcr);
 }
	/*
	* (C) Copyright 2007
	* Sascha Hauer, Pengutronix
	*
	* (C) Copyright 2008-2010 Freescale Semiconductor, Inc.
	*
	* 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 <div64.h>
	#include <asm/io.h>
	#include <asm/errno.h>
	#include <asm/arch/imx-regs.h>
	#include <asm/arch/crm_regs.h>
	#include <asm/arch/clock.h>
	#include <asm/arch/sys_proto.h>
	#ifdef CONFIG_FSL_ESDHC
	#include <fsl_esdhc.h>
	#endif
	#include <netdev.h>

	#define CLK_CODE(arm, ahb, sel) (((arm) << 16) + ((ahb) << 8) + (sel))
	#define CLK_CODE_ARM(c) (((c) >> 16) & 0xFF)
	#define CLK_CODE_AHB(c) (((c) >> 8) & 0xFF)
	#define CLK_CODE_PATH(c) ((c) & 0xFF)

	#define CCM_GET_DIVIDER(x, m, o) (((x) & (m)) >> (o))

	#ifdef CONFIG_FSL_ESDHC
	DECLARE_GLOBAL_DATA_PTR;
	#endif

	static int g_clk_mux_auto[8] = {
	CLK_CODE(1, 3, 0), CLK_CODE(1, 2, 1), CLK_CODE(2, 1, 1), -1,
	CLK_CODE(1, 6, 0), CLK_CODE(1, 4, 1), CLK_CODE(2, 2, 1), -1,
	};

	static int g_clk_mux_consumer[16] = {
	CLK_CODE(1, 4, 0), CLK_CODE(1, 3, 1), CLK_CODE(1, 3, 1), -1,
	-1, -1, CLK_CODE(4, 1, 0), CLK_CODE(1, 5, 0),
	CLK_CODE(1, 8, 1), CLK_CODE(1, 6, 1), CLK_CODE(2, 4, 0), -1,
	-1, -1, CLK_CODE(4, 2, 0), -1,
	};

	static int hsp_div_table[3][16] = {
	{4, 3, 2, -1, -1, -1, 1, 5, 4, 3, 2, -1, -1, -1, 1, -1},
	{-1, -1, -1, -1, -1, -1, -1, -1, 8, 6, 4, -1, -1, -1, 2, -1},
	{3, -1, -1, -1, -1, -1, -1, -1, 3, -1, -1, -1, -1, -1, -1, -1},
	};

	u32 get_cpu_rev(void)
	{
	int reg;
	struct iim_regs *iim =
	(struct iim_regs *)IIM_BASE_ADDR;
	reg = readl(&iim->iim_srev);
	if (!reg) {
	reg = readw(ROMPATCH_REV);
	reg <<= 4;
	} else {
	reg += CHIP_REV_1_0;
	}

	return 0x35000 + (reg & 0xFF);
	}

	static u32 get_arm_div(u32 pdr0, u32 fi, u32 fd)
	{
	int *pclk_mux;
	if (pdr0 & MXC_CCM_PDR0_AUTO_CON) {
	pclk_mux = g_clk_mux_consumer +
	((pdr0 & MXC_CCM_PDR0_CON_MUX_DIV_MASK) >>
	MXC_CCM_PDR0_CON_MUX_DIV_OFFSET);
	} else {
	pclk_mux = g_clk_mux_auto +
	((pdr0 & MXC_CCM_PDR0_AUTO_MUX_DIV_MASK) >>
	MXC_CCM_PDR0_AUTO_MUX_DIV_OFFSET);
	}

	if ((*pclk_mux) == -1)
	return -1;

	if (fi && fd) {
	if (!CLK_CODE_PATH(*pclk_mux)) {
	fi = fd = 1;
	return CLK_CODE_ARM(*pclk_mux);
	}
	if (pdr0 & MXC_CCM_PDR0_AUTO_CON) {
	*fi = 3;
	*fd = 4;
	} else {
	*fi = 2;
	*fd = 3;
	}
	}
	return CLK_CODE_ARM(*pclk_mux);
	}

	static int get_ahb_div(u32 pdr0)
	{
	int *pclk_mux;

	pclk_mux = g_clk_mux_consumer +
	((pdr0 & MXC_CCM_PDR0_CON_MUX_DIV_MASK) >>
	MXC_CCM_PDR0_CON_MUX_DIV_OFFSET);

	if ((*pclk_mux) == -1)
	return -1;

	return CLK_CODE_AHB(*pclk_mux);
	}

	static u32 decode_pll(u32 reg, u32 infreq)
	{
	u32 mfi = (reg >> 10) & 0xf;
	s32 mfn = reg & 0x3ff;
	u32 mfd = (reg >> 16) & 0x3ff;
	u32 pd = (reg >> 26) & 0xf;

	mfi = mfi <= 5 ? 5 : mfi;
	mfn = mfn >= 512 ? mfn - 1024 : mfn;
	mfd += 1;
	pd += 1;

	return lldiv(2 * (u64)infreq * (mfi * mfd + mfn),
	mfd * pd);
	}

	static u32 get_mcu_main_clk(void)
	{
	u32 arm_div = 0, fi = 0, fd = 0;
	struct ccm_regs *ccm =
	(struct ccm_regs *)IMX_CCM_BASE;
	arm_div = get_arm_div(readl(&ccm->pdr0), &fi, &fd);
	fi *= decode_pll(readl(&ccm->mpctl), MXC_HCLK);
	return fi / (arm_div * fd);
	}

	static u32 get_ipg_clk(void)
	{
	u32 freq = get_mcu_main_clk();
	struct ccm_regs *ccm =
	(struct ccm_regs *)IMX_CCM_BASE;
	u32 pdr0 = readl(&ccm->pdr0);

	return freq / (get_ahb_div(pdr0) * 2);
	}

	static u32 get_ipg_per_clk(void)
	{
	u32 freq = get_mcu_main_clk();
	struct ccm_regs *ccm =
	(struct ccm_regs *)IMX_CCM_BASE;
	u32 pdr0 = readl(&ccm->pdr0);
	u32 pdr4 = readl(&ccm->pdr4);
	u32 div;
	if (pdr0 & MXC_CCM_PDR0_PER_SEL) {
	div = CCM_GET_DIVIDER(pdr4,
	MXC_CCM_PDR4_PER0_PODF_MASK,
	MXC_CCM_PDR4_PER0_PODF_OFFSET) + 1;
	} else {
	div = CCM_GET_DIVIDER(pdr0,
	MXC_CCM_PDR0_PER_PODF_MASK,
	MXC_CCM_PDR0_PER_PODF_OFFSET) + 1;
	div *= get_ahb_div(pdr0);
	}
	return freq / div;
	}

	u32 imx_get_uartclk(void)
	{
	u32 freq;
	struct ccm_regs *ccm =
	(struct ccm_regs *)IMX_CCM_BASE;
	u32 pdr4 = readl(&ccm->pdr4);

	if (readl(&ccm->pdr3) & MXC_CCM_PDR3_UART_M_U)
	freq = get_mcu_main_clk();
	else
	freq = decode_pll(readl(&ccm->ppctl), MXC_HCLK);
	freq /= CCM_GET_DIVIDER(pdr4,
	MXC_CCM_PDR4_UART_PODF_MASK,
	MXC_CCM_PDR4_UART_PODF_OFFSET) + 1;
	return freq;
	}

	unsigned int mxc_get_main_clock(enum mxc_main_clock clk)
	{
	u32 nfc_pdf, hsp_podf;
	u32 pll, ret_val = 0, usb_podf;
	struct ccm_regs *ccm =
	(struct ccm_regs *)IMX_CCM_BASE;

	u32 reg = readl(&ccm->pdr0);
	u32 reg4 = readl(&ccm->pdr4);

	reg \|= 0x1;

	switch (clk) {
	case CPU_CLK:
	ret_val = get_mcu_main_clk();
	break;
	case AHB_CLK:
	ret_val = get_mcu_main_clk();
	break;
	case HSP_CLK:
	if (reg & CLKMODE_CONSUMER) {
	hsp_podf = (reg >> 20) & 0x3;
	pll = get_mcu_main_clk();
	hsp_podf = hsp_div_table[hsp_podf][(reg>>16)&0xF];
	if (hsp_podf > 0) {
	ret_val = pll / hsp_podf;
	} else {
	puts("mismatch HSP with ARM clock setting\n");
	ret_val = 0;
	}
	} else {
	ret_val = get_mcu_main_clk();
	}
	break;
	case IPG_CLK:
	ret_val = get_ipg_clk();
	break;
	case IPG_PER_CLK:
	ret_val = get_ipg_per_clk();
	break;
	case NFC_CLK:
	nfc_pdf = (reg4 >> 28) & 0xF;
	pll = get_mcu_main_clk();
	/* AHB/nfc_pdf */
	ret_val = pll / (nfc_pdf + 1);
	break;
	case USB_CLK:
	usb_podf = (reg4 >> 22) & 0x3F;
	if (reg4 & 0x200)
	pll = get_mcu_main_clk();
	else
	pll = decode_pll(readl(&ccm->ppctl), MXC_HCLK);

	ret_val = pll / (usb_podf + 1);
	break;
	default:
	printf("Unknown clock: %d\n", clk);
	break;
	}

	return ret_val;
	}
	unsigned int mxc_get_peri_clock(enum mxc_peri_clock clk)
	{
	u32 ret_val = 0, pdf, pre_pdf, clk_sel;
	struct ccm_regs *ccm =
	(struct ccm_regs *)IMX_CCM_BASE;
	u32 mpdr2 = readl(&ccm->pdr2);
	u32 mpdr3 = readl(&ccm->pdr3);
	u32 mpdr4 = readl(&ccm->pdr4);

	switch (clk) {
	case UART1_BAUD:
	case UART2_BAUD:
	case UART3_BAUD:
	clk_sel = mpdr3 & (1 << 14);
	pdf = (mpdr4 >> 10) & 0x3F;
	ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) :
	decode_pll(readl(&ccm->ppctl), MXC_HCLK)) / (pdf + 1);
	break;
	case SSI1_BAUD:
	pre_pdf = (mpdr2 >> 24) & 0x7;
	pdf = mpdr2 & 0x3F;
	clk_sel = mpdr2 & (1 << 6);
	ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) :
	decode_pll(readl(&ccm->ppctl), MXC_HCLK)) /
	((pre_pdf + 1) * (pdf + 1));
	break;
	case SSI2_BAUD:
	pre_pdf = (mpdr2 >> 27) & 0x7;
	pdf = (mpdr2 >> 8) & 0x3F;
	clk_sel = mpdr2 & (1 << 6);
	ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) :
	decode_pll(readl(&ccm->ppctl), MXC_HCLK)) /
	((pre_pdf + 1) * (pdf + 1));
	break;
	case CSI_BAUD:
	clk_sel = mpdr2 & (1 << 7);
	pdf = (mpdr2 >> 16) & 0x3F;
	ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) :
	decode_pll(readl(&ccm->ppctl), MXC_HCLK)) / (pdf + 1);
	break;
	case MSHC_CLK:
	pre_pdf = readl(&ccm->pdr1);
	clk_sel = (pre_pdf & 0x80);
	pdf = (pre_pdf >> 22) & 0x3F;
	pre_pdf = (pre_pdf >> 28) & 0x7;
	ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) :
	decode_pll(readl(&ccm->ppctl), MXC_HCLK)) /
	((pre_pdf + 1) * (pdf + 1));
	break;
	case ESDHC1_CLK:
	clk_sel = mpdr3 & 0x40;
	pdf = mpdr3 & 0x3F;
	ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) :
	decode_pll(readl(&ccm->ppctl), MXC_HCLK)) / (pdf + 1);
	break;
	case ESDHC2_CLK:
	clk_sel = mpdr3 & 0x40;
	pdf = (mpdr3 >> 8) & 0x3F;
	ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) :
	decode_pll(readl(&ccm->ppctl), MXC_HCLK)) / (pdf + 1);
	break;
	case ESDHC3_CLK:
	clk_sel = mpdr3 & 0x40;
	pdf = (mpdr3 >> 16) & 0x3F;
	ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) :
	decode_pll(readl(&ccm->ppctl), MXC_HCLK)) / (pdf + 1);
	break;
	case SPDIF_CLK:
	clk_sel = mpdr3 & 0x400000;
	pre_pdf = (mpdr3 >> 29) & 0x7;
	pdf = (mpdr3 >> 23) & 0x3F;
	ret_val = ((clk_sel != 0) ? mxc_get_main_clock(CPU_CLK) :
	decode_pll(readl(&ccm->ppctl), MXC_HCLK)) /
	((pre_pdf + 1) * (pdf + 1));
	break;
	default:
	printf("%s(): This clock: %d not supported yet\n",
	__func__, clk);
	break;
	}

	return ret_val;
	}

	unsigned int mxc_get_clock(enum mxc_clock clk)
	{
	switch (clk) {
	case MXC_ARM_CLK:
	return get_mcu_main_clk();
	case MXC_AHB_CLK:
	break;
	case MXC_IPG_CLK:
	return get_ipg_clk();
	case MXC_IPG_PERCLK:
	case MXC_I2C_CLK:
	return get_ipg_per_clk();
	case MXC_UART_CLK:
	return imx_get_uartclk();
	case MXC_ESDHC_CLK:
	return mxc_get_peri_clock(ESDHC1_CLK);
	case MXC_USB_CLK:
	return mxc_get_main_clock(USB_CLK);
	case MXC_FEC_CLK:
	return get_ipg_clk();
	case MXC_CSPI_CLK:
	return get_ipg_clk();
	}
	return -1;
	}

	#ifdef CONFIG_FEC_MXC
	/*
	* The MX35 has no fuse for MAC, return a NULL MAC
	*/
	void imx_get_mac_from_fuse(int dev_id, unsigned char *mac)
	{
	memset(mac, 0, 6);
	}

	u32 imx_get_fecclk(void)
	{
	return mxc_get_clock(MXC_IPG_CLK);
	}
	#endif

	int do_mx35_showclocks(cmd_tbl_t *cmdtp,
	int flag, int argc, char * const argv[])
	{
	u32 cpufreq = get_mcu_main_clk();
	printf("mx35 cpu clock: %dMHz\n", cpufreq / 1000000);
	printf("ipg clock : %dHz\n", get_ipg_clk());
	printf("ipg per clock : %dHz\n", get_ipg_per_clk());
	printf("uart clock : %dHz\n", mxc_get_clock(MXC_UART_CLK));

	return 0;
	}

	U_BOOT_CMD(
	clocks, CONFIG_SYS_MAXARGS, 1, do_mx35_showclocks,
	"display clocks",
	""
	);

	#if defined(CONFIG_DISPLAY_CPUINFO)
	static char *get_reset_cause(void)
	{
	/* read RCSR register from CCM module */
	struct ccm_regs *ccm =
	(struct ccm_regs *)IMX_CCM_BASE;

	u32 cause = readl(&ccm->rcsr) & 0x0F;

	switch (cause) {
	case 0x0000:
	return "POR";
	case 0x0002:
	return "JTAG";
	case 0x0004:
	return "RST";
	case 0x0008:
	return "WDOG";
	default:
	return "unknown reset";
	}
	}

	int print_cpuinfo(void)
	{
	u32 srev = get_cpu_rev();

	printf("CPU: Freescale i.MX35 rev %d.%d at %d MHz.\n",
	(srev & 0xF0) >> 4, (srev & 0x0F),
	get_mcu_main_clk() / 1000000);

	printf("Reset cause: %s\n", get_reset_cause());

	return 0;
	}
	#endif

	/*
	* Initializes on-chip ethernet controllers.
	* to override, implement board_eth_init()
	*/
	int cpu_eth_init(bd_t *bis)
	{
	int rc = -ENODEV;

	#if defined(CONFIG_FEC_MXC)
	rc = fecmxc_initialize(bis);
	#endif

	return rc;
	}

	#ifdef CONFIG_FSL_ESDHC
	/*
	* Initializes on-chip MMC controllers.
	* to override, implement board_mmc_init()
	*/
	int cpu_mmc_init(bd_t *bis)
	{
	return fsl_esdhc_mmc_init(bis);
	}
	#endif

	int get_clocks(void)
	{
	#ifdef CONFIG_FSL_ESDHC
	gd->sdhc_clk = mxc_get_clock(MXC_ESDHC_CLK);
	#endif
	return 0;
	}

	void reset_cpu(ulong addr)
	{
	struct wdog_regs wdog = (struct wdog_regs )WDOG_BASE_ADDR;
	writew(4, &wdog->wcr);
	}