u-boot/arch/arm/cpu/armv7/mx6/clock.c

/*
 * Copyright (C) 2010-2011 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 <asm/io.h>
#include <asm/errno.h>
#include <asm/arch/imx-regs.h>
#include <asm/arch/ccm_regs.h>
#include <asm/arch/clock.h>

enum pll_clocks {
	PLL_SYS,	/* System PLL */
	PLL_BUS,	/* System Bus PLL*/
	PLL_USBOTG,	/* OTG USB PLL */
	PLL_ENET,	/* ENET PLL */
};

struct imx_ccm_reg *imx_ccm = (struct imx_ccm_reg *)CCM_BASE_ADDR;

void enable_usboh3_clk(unsigned char enable)
{
	u32 reg;

	reg = __raw_readl(&imx_ccm->CCGR6);
	if (enable)
		reg |= MXC_CCM_CCGR_CG_MASK << MXC_CCM_CCGR0_CG0_OFFSET;
	else
		reg &= ~(MXC_CCM_CCGR_CG_MASK << MXC_CCM_CCGR0_CG0_OFFSET);
	__raw_writel(reg, &imx_ccm->CCGR6);

}

static u32 decode_pll(enum pll_clocks pll, u32 infreq)
{
	u32 div;

	switch (pll) {
	case PLL_SYS:
		div = __raw_readl(&imx_ccm->analog_pll_sys);
		div &= BM_ANADIG_PLL_SYS_DIV_SELECT;

		return infreq * (div >> 1);
	case PLL_BUS:
		div = __raw_readl(&imx_ccm->analog_pll_528);
		div &= BM_ANADIG_PLL_528_DIV_SELECT;

		return infreq * (20 + (div << 1));
	case PLL_USBOTG:
		div = __raw_readl(&imx_ccm->analog_usb1_pll_480_ctrl);
		div &= BM_ANADIG_USB1_PLL_480_CTRL_DIV_SELECT;

		return infreq * (20 + (div << 1));
	case PLL_ENET:
		div = __raw_readl(&imx_ccm->analog_pll_enet);
		div &= BM_ANADIG_PLL_ENET_DIV_SELECT;

		return (div == 3 ? 125000000 : 25000000 * (div << 1));
	default:
		return 0;
	}
	/* NOTREACHED */
}

static u32 get_mcu_main_clk(void)
{
	u32 reg, freq;

	reg = __raw_readl(&imx_ccm->cacrr);
	reg &= MXC_CCM_CACRR_ARM_PODF_MASK;
	reg >>= MXC_CCM_CACRR_ARM_PODF_OFFSET;
	freq = decode_pll(PLL_SYS, CONFIG_SYS_MX6_HCLK);

	return freq / (reg + 1);
}

static u32 get_periph_clk(void)
{
	u32 reg, freq = 0;

	reg = __raw_readl(&imx_ccm->cbcdr);
	if (reg & MXC_CCM_CBCDR_PERIPH_CLK_SEL) {
		reg = __raw_readl(&imx_ccm->cbcmr);
		reg &= MXC_CCM_CBCMR_PERIPH_CLK2_SEL_MASK;
		reg >>= MXC_CCM_CBCMR_PERIPH_CLK2_SEL_OFFSET;

		switch (reg) {
		case 0:
			freq = decode_pll(PLL_USBOTG, CONFIG_SYS_MX6_HCLK);
			break;
		case 1:
		case 2:
			freq = CONFIG_SYS_MX6_HCLK;
			break;
		default:
			break;
		}
	} else {
		reg = __raw_readl(&imx_ccm->cbcmr);
		reg &= MXC_CCM_CBCMR_PRE_PERIPH_CLK_SEL_MASK;
		reg >>= MXC_CCM_CBCMR_PRE_PERIPH_CLK_SEL_OFFSET;

		switch (reg) {
		case 0:
			freq = decode_pll(PLL_BUS, CONFIG_SYS_MX6_HCLK);
			break;
		case 1:
			freq = PLL2_PFD2_FREQ;
			break;
		case 2:
			freq = PLL2_PFD0_FREQ;
			break;
		case 3:
			freq = PLL2_PFD2_DIV_FREQ;
			break;
		default:
			break;
		}
	}

	return freq;
}


static u32 get_ahb_clk(void)
{
	u32 reg, ahb_podf;

	reg = __raw_readl(&imx_ccm->cbcdr);
	reg &= MXC_CCM_CBCDR_AHB_PODF_MASK;
	ahb_podf = reg >> MXC_CCM_CBCDR_AHB_PODF_OFFSET;

	return get_periph_clk() / (ahb_podf + 1);
}

static u32 get_ipg_clk(void)
{
	u32 reg, ipg_podf;

	reg = __raw_readl(&imx_ccm->cbcdr);
	reg &= MXC_CCM_CBCDR_IPG_PODF_MASK;
	ipg_podf = reg >> MXC_CCM_CBCDR_IPG_PODF_OFFSET;

	return get_ahb_clk() / (ipg_podf + 1);
}

static u32 get_ipg_per_clk(void)
{
	u32 reg, perclk_podf;

	reg = __raw_readl(&imx_ccm->cscmr1);
	perclk_podf = reg & MXC_CCM_CSCMR1_PERCLK_PODF_MASK;

	return get_ipg_clk() / (perclk_podf + 1);
}

static u32 get_uart_clk(void)
{
	u32 reg, uart_podf;

	reg = __raw_readl(&imx_ccm->cscdr1);
	reg &= MXC_CCM_CSCDR1_UART_CLK_PODF_MASK;
	uart_podf = reg >> MXC_CCM_CSCDR1_UART_CLK_PODF_OFFSET;

	return PLL3_80M / (uart_podf + 1);
}

static u32 get_cspi_clk(void)
{
	u32 reg, cspi_podf;

	reg = __raw_readl(&imx_ccm->cscdr2);
	reg &= MXC_CCM_CSCDR2_ECSPI_CLK_PODF_MASK;
	cspi_podf = reg >> MXC_CCM_CSCDR2_ECSPI_CLK_PODF_OFFSET;

	return	PLL3_60M / (cspi_podf + 1);
}

static u32 get_axi_clk(void)
{
	u32 root_freq, axi_podf;
	u32 cbcdr =  __raw_readl(&imx_ccm->cbcdr);

	axi_podf = cbcdr & MXC_CCM_CBCDR_AXI_PODF_MASK;
	axi_podf >>= MXC_CCM_CBCDR_AXI_PODF_OFFSET;

	if (cbcdr & MXC_CCM_CBCDR_AXI_SEL) {
		if (cbcdr & MXC_CCM_CBCDR_AXI_ALT_SEL)
			root_freq = PLL2_PFD2_FREQ;
		else
			root_freq = PLL3_PFD1_FREQ;
	} else
		root_freq = get_periph_clk();

	return  root_freq / (axi_podf + 1);
}

static u32 get_emi_slow_clk(void)
{
	u32 emi_clk_sel, emi_slow_pof, cscmr1, root_freq = 0;

	cscmr1 =  __raw_readl(&imx_ccm->cscmr1);
	emi_clk_sel = cscmr1 & MXC_CCM_CSCMR1_ACLK_EMI_SLOW_MASK;
	emi_clk_sel >>= MXC_CCM_CSCMR1_ACLK_EMI_SLOW_OFFSET;
	emi_slow_pof = cscmr1 & MXC_CCM_CSCMR1_ACLK_EMI_SLOW_PODF_MASK;
	emi_slow_pof >>= MXC_CCM_CSCMR1_ACLK_EMI_PODF_OFFSET;

	switch (emi_clk_sel) {
	case 0:
		root_freq = get_axi_clk();
		break;
	case 1:
		root_freq = decode_pll(PLL_USBOTG, CONFIG_SYS_MX6_HCLK);
		break;
	case 2:
		root_freq = PLL2_PFD2_FREQ;
		break;
	case 3:
		root_freq = PLL2_PFD0_FREQ;
		break;
	}

	return root_freq / (emi_slow_pof + 1);
}

static u32 get_mmdc_ch0_clk(void)
{
	u32 cbcdr = __raw_readl(&imx_ccm->cbcdr);
	u32 mmdc_ch0_podf = (cbcdr & MXC_CCM_CBCDR_MMDC_CH0_PODF_MASK) >>
				MXC_CCM_CBCDR_MMDC_CH0_PODF_OFFSET;

	return get_periph_clk() / (mmdc_ch0_podf + 1);
}

static u32 get_usdhc_clk(u32 port)
{
	u32 root_freq = 0, usdhc_podf = 0, clk_sel = 0;
	u32 cscmr1 = __raw_readl(&imx_ccm->cscmr1);
	u32 cscdr1 = __raw_readl(&imx_ccm->cscdr1);

	switch (port) {
	case 0:
		usdhc_podf = (cscdr1 & MXC_CCM_CSCDR1_USDHC1_PODF_MASK) >>
					MXC_CCM_CSCDR1_USDHC1_PODF_OFFSET;
		clk_sel = cscmr1 & MXC_CCM_CSCMR1_USDHC1_CLK_SEL;

		break;
	case 1:
		usdhc_podf = (cscdr1 & MXC_CCM_CSCDR1_USDHC2_PODF_MASK) >>
					MXC_CCM_CSCDR1_USDHC2_PODF_OFFSET;
		clk_sel = cscmr1 & MXC_CCM_CSCMR1_USDHC2_CLK_SEL;

		break;
	case 2:
		usdhc_podf = (cscdr1 & MXC_CCM_CSCDR1_USDHC3_PODF_MASK) >>
					MXC_CCM_CSCDR1_USDHC3_PODF_OFFSET;
		clk_sel = cscmr1 & MXC_CCM_CSCMR1_USDHC3_CLK_SEL;

		break;
	case 3:
		usdhc_podf = (cscdr1 & MXC_CCM_CSCDR1_USDHC4_PODF_MASK) >>
					MXC_CCM_CSCDR1_USDHC4_PODF_OFFSET;
		clk_sel = cscmr1 & MXC_CCM_CSCMR1_USDHC4_CLK_SEL;

		break;
	default:
		break;
	}

	if (clk_sel)
		root_freq = PLL2_PFD0_FREQ;
	else
		root_freq = PLL2_PFD2_FREQ;

	return root_freq / (usdhc_podf + 1);
}

u32 imx_get_uartclk(void)
{
	return get_uart_clk();
}

u32 imx_get_fecclk(void)
{
	return decode_pll(PLL_ENET, CONFIG_SYS_MX6_HCLK);
}

unsigned int mxc_get_clock(enum mxc_clock clk)
{
	switch (clk) {
	case MXC_ARM_CLK:
		return get_mcu_main_clk();
	case MXC_PER_CLK:
		return get_periph_clk();
	case MXC_AHB_CLK:
		return get_ahb_clk();
	case MXC_IPG_CLK:
		return get_ipg_clk();
	case MXC_IPG_PERCLK:
		return get_ipg_per_clk();
	case MXC_UART_CLK:
		return get_uart_clk();
	case MXC_CSPI_CLK:
		return get_cspi_clk();
	case MXC_AXI_CLK:
		return get_axi_clk();
	case MXC_EMI_SLOW_CLK:
		return get_emi_slow_clk();
	case MXC_DDR_CLK:
		return get_mmdc_ch0_clk();
	case MXC_ESDHC_CLK:
		return get_usdhc_clk(0);
	case MXC_ESDHC2_CLK:
		return get_usdhc_clk(1);
	case MXC_ESDHC3_CLK:
		return get_usdhc_clk(2);
	case MXC_ESDHC4_CLK:
		return get_usdhc_clk(3);
	case MXC_SATA_CLK:
		return get_ahb_clk();
	default:
		break;
	}

	return -1;
}

/*
 * Dump some core clockes.
 */
int do_mx6_showclocks(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	u32 freq;
	freq = decode_pll(PLL_SYS, CONFIG_SYS_MX6_HCLK);
	printf("PLL_SYS    %8d MHz\n", freq / 1000000);
	freq = decode_pll(PLL_BUS, CONFIG_SYS_MX6_HCLK);
	printf("PLL_BUS    %8d MHz\n", freq / 1000000);
	freq = decode_pll(PLL_USBOTG, CONFIG_SYS_MX6_HCLK);
	printf("PLL_OTG    %8d MHz\n", freq / 1000000);
	freq = decode_pll(PLL_ENET, CONFIG_SYS_MX6_HCLK);
	printf("PLL_NET    %8d MHz\n", freq / 1000000);

	printf("\n");
	printf("IPG        %8d kHz\n", mxc_get_clock(MXC_IPG_CLK) / 1000);
	printf("UART       %8d kHz\n", mxc_get_clock(MXC_UART_CLK) / 1000);
	printf("CSPI       %8d kHz\n", mxc_get_clock(MXC_CSPI_CLK) / 1000);
	printf("AHB        %8d kHz\n", mxc_get_clock(MXC_AHB_CLK) / 1000);
	printf("AXI        %8d kHz\n", mxc_get_clock(MXC_AXI_CLK) / 1000);
	printf("DDR        %8d kHz\n", mxc_get_clock(MXC_DDR_CLK) / 1000);
	printf("USDHC1     %8d kHz\n", mxc_get_clock(MXC_ESDHC_CLK) / 1000);
	printf("USDHC2     %8d kHz\n", mxc_get_clock(MXC_ESDHC2_CLK) / 1000);
	printf("USDHC3     %8d kHz\n", mxc_get_clock(MXC_ESDHC3_CLK) / 1000);
	printf("USDHC4     %8d kHz\n", mxc_get_clock(MXC_ESDHC4_CLK) / 1000);
	printf("EMI SLOW   %8d kHz\n", mxc_get_clock(MXC_EMI_SLOW_CLK) / 1000);
	printf("IPG PERCLK %8d kHz\n", mxc_get_clock(MXC_IPG_PERCLK) / 1000);

	return 0;
}

/***************************************************/

U_BOOT_CMD(
	clocks,	CONFIG_SYS_MAXARGS, 1, do_mx6_showclocks,
	"display clocks",
	""
);