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

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/*
* 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",
""
);