diff options
Diffstat (limited to 'arch/arm/cpu/arm_cortexa8/mx51/clock.c')
| -rw-r--r-- | arch/arm/cpu/arm_cortexa8/mx51/clock.c | 294 |
1 files changed, 294 insertions, 0 deletions
diff --git a/arch/arm/cpu/arm_cortexa8/mx51/clock.c b/arch/arm/cpu/arm_cortexa8/mx51/clock.c new file mode 100644 index 0000000000..38480ac5a1 --- /dev/null +++ b/arch/arm/cpu/arm_cortexa8/mx51/clock.c @@ -0,0 +1,294 @@ +/* + * (C) Copyright 2007 + * Sascha Hauer, Pengutronix + * + * (C) Copyright 2009 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/crm_regs.h> +#include <asm/arch/clock.h> + +enum pll_clocks { + PLL1_CLOCK = 0, + PLL2_CLOCK, + PLL3_CLOCK, + PLL_CLOCKS, +}; + +struct mxc_pll_reg *mxc_plls[PLL_CLOCKS] = { + [PLL1_CLOCK] = (struct mxc_pll_reg *)PLL1_BASE_ADDR, + [PLL2_CLOCK] = (struct mxc_pll_reg *)PLL2_BASE_ADDR, + [PLL3_CLOCK] = (struct mxc_pll_reg *)PLL3_BASE_ADDR, +}; + +struct mxc_ccm_reg *mxc_ccm = (struct mxc_ccm_reg *)MXC_CCM_BASE; + +/* + * Calculate the frequency of this pll. + */ +static u32 decode_pll(struct mxc_pll_reg *pll, u32 infreq) +{ + u32 mfi, mfn, mfd, pd; + + mfn = __raw_readl(&pll->mfn); + mfd = __raw_readl(&pll->mfd) + 1; + mfi = __raw_readl(&pll->op); + pd = (mfi & 0xF) + 1; + mfi = (mfi >> 4) & 0xF; + mfi = (mfi >= 5) ? mfi : 5; + + return ((4 * (infreq / 1000) * (mfi * mfd + mfn)) / (mfd * pd)) * 1000; +} + +/* + * Get mcu main rate + */ +u32 get_mcu_main_clk(void) +{ + u32 reg, freq; + + reg = (__raw_readl(&mxc_ccm->cacrr) & MXC_CCM_CACRR_ARM_PODF_MASK) >> + MXC_CCM_CACRR_ARM_PODF_OFFSET; + freq = decode_pll(mxc_plls[PLL1_CLOCK], CONFIG_MX51_HCLK_FREQ); + return freq / (reg + 1); +} + +/* + * Get the rate of peripheral's root clock. + */ +static u32 get_periph_clk(void) +{ + u32 reg; + + reg = __raw_readl(&mxc_ccm->cbcdr); + if (!(reg & MXC_CCM_CBCDR_PERIPH_CLK_SEL)) + return decode_pll(mxc_plls[PLL2_CLOCK], CONFIG_MX51_HCLK_FREQ); + reg = __raw_readl(&mxc_ccm->cbcmr); + switch ((reg & MXC_CCM_CBCMR_PERIPH_CLK_SEL_MASK) >> + MXC_CCM_CBCMR_PERIPH_CLK_SEL_OFFSET) { + case 0: + return decode_pll(mxc_plls[PLL1_CLOCK], CONFIG_MX51_HCLK_FREQ); + case 1: + return decode_pll(mxc_plls[PLL3_CLOCK], CONFIG_MX51_HCLK_FREQ); + default: + return 0; + } + /* NOTREACHED */ +} + +/* + * Get the rate of ipg clock. + */ +static u32 get_ipg_clk(void) +{ + u32 ahb_podf, ipg_podf; + + ahb_podf = __raw_readl(&mxc_ccm->cbcdr); + ipg_podf = (ahb_podf & MXC_CCM_CBCDR_IPG_PODF_MASK) >> + MXC_CCM_CBCDR_IPG_PODF_OFFSET; + ahb_podf = (ahb_podf & MXC_CCM_CBCDR_AHB_PODF_MASK) >> + MXC_CCM_CBCDR_AHB_PODF_OFFSET; + return get_periph_clk() / ((ahb_podf + 1) * (ipg_podf + 1)); +} + +/* + * Get the rate of ipg_per clock. + */ +static u32 get_ipg_per_clk(void) +{ + u32 pred1, pred2, podf; + + if (__raw_readl(&mxc_ccm->cbcmr) & MXC_CCM_CBCMR_PERCLK_IPG_CLK_SEL) + return get_ipg_clk(); + /* Fixme: not handle what about lpm*/ + podf = __raw_readl(&mxc_ccm->cbcdr); + pred1 = (podf & MXC_CCM_CBCDR_PERCLK_PRED1_MASK) >> + MXC_CCM_CBCDR_PERCLK_PRED1_OFFSET; + pred2 = (podf & MXC_CCM_CBCDR_PERCLK_PRED2_MASK) >> + MXC_CCM_CBCDR_PERCLK_PRED2_OFFSET; + podf = (podf & MXC_CCM_CBCDR_PERCLK_PODF_MASK) >> + MXC_CCM_CBCDR_PERCLK_PODF_OFFSET; + + return get_periph_clk() / ((pred1 + 1) * (pred2 + 1) * (podf + 1)); +} + +/* + * Get the rate of uart clk. + */ +static u32 get_uart_clk(void) +{ + unsigned int freq, reg, pred, podf; + + reg = __raw_readl(&mxc_ccm->cscmr1); + switch ((reg & MXC_CCM_CSCMR1_UART_CLK_SEL_MASK) >> + MXC_CCM_CSCMR1_UART_CLK_SEL_OFFSET) { + case 0x0: + freq = decode_pll(mxc_plls[PLL1_CLOCK], + CONFIG_MX51_HCLK_FREQ); + break; + case 0x1: + freq = decode_pll(mxc_plls[PLL2_CLOCK], + CONFIG_MX51_HCLK_FREQ); + break; + case 0x2: + freq = decode_pll(mxc_plls[PLL3_CLOCK], + CONFIG_MX51_HCLK_FREQ); + break; + default: + return 66500000; + } + + reg = __raw_readl(&mxc_ccm->cscdr1); + + pred = (reg & MXC_CCM_CSCDR1_UART_CLK_PRED_MASK) >> + MXC_CCM_CSCDR1_UART_CLK_PRED_OFFSET; + + podf = (reg & MXC_CCM_CSCDR1_UART_CLK_PODF_MASK) >> + MXC_CCM_CSCDR1_UART_CLK_PODF_OFFSET; + freq /= (pred + 1) * (podf + 1); + + return freq; +} + +/* + * This function returns the low power audio clock. + */ +u32 get_lp_apm(void) +{ + u32 ret_val = 0; + u32 ccsr = __raw_readl(&mxc_ccm->ccsr); + + if (((ccsr >> 9) & 1) == 0) + ret_val = CONFIG_MX51_HCLK_FREQ; + else + ret_val = ((32768 * 1024)); + + return ret_val; +} + +/* + * get cspi clock rate. + */ +u32 imx_get_cspiclk(void) +{ + u32 ret_val = 0, pdf, pre_pdf, clk_sel; + u32 cscmr1 = __raw_readl(&mxc_ccm->cscmr1); + u32 cscdr2 = __raw_readl(&mxc_ccm->cscdr2); + + pre_pdf = (cscdr2 & MXC_CCM_CSCDR2_CSPI_CLK_PRED_MASK) \ + >> MXC_CCM_CSCDR2_CSPI_CLK_PRED_OFFSET; + pdf = (cscdr2 & MXC_CCM_CSCDR2_CSPI_CLK_PODF_MASK) \ + >> MXC_CCM_CSCDR2_CSPI_CLK_PODF_OFFSET; + clk_sel = (cscmr1 & MXC_CCM_CSCMR1_CSPI_CLK_SEL_MASK) \ + >> MXC_CCM_CSCMR1_CSPI_CLK_SEL_OFFSET; + + switch (clk_sel) { + case 0: + ret_val = decode_pll(mxc_plls[PLL1_CLOCK], + CONFIG_MX51_HCLK_FREQ) / + ((pre_pdf + 1) * (pdf + 1)); + break; + case 1: + ret_val = decode_pll(mxc_plls[PLL2_CLOCK], + CONFIG_MX51_HCLK_FREQ) / + ((pre_pdf + 1) * (pdf + 1)); + break; + case 2: + ret_val = decode_pll(mxc_plls[PLL3_CLOCK], + CONFIG_MX51_HCLK_FREQ) / + ((pre_pdf + 1) * (pdf + 1)); + break; + default: + ret_val = get_lp_apm() / ((pre_pdf + 1) * (pdf + 1)); + break; + } + + return ret_val; +} + +/* + * The API of get mxc clockes. + */ +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: + return get_ipg_per_clk(); + case MXC_UART_CLK: + return get_uart_clk(); + case MXC_CSPI_CLK: + return imx_get_cspiclk(); + case MXC_FEC_CLK: + return decode_pll(mxc_plls[PLL1_CLOCK], + CONFIG_MX51_HCLK_FREQ); + default: + break; + } + return -1; +} + +u32 imx_get_uartclk(void) +{ + return get_uart_clk(); +} + + +u32 imx_get_fecclk(void) +{ + return mxc_get_clock(MXC_IPG_CLK); +} + +/* + * Dump some core clockes. + */ +int do_mx51_showclocks(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) +{ + u32 freq; + + freq = decode_pll(mxc_plls[PLL1_CLOCK], CONFIG_MX51_HCLK_FREQ); + printf("mx51 pll1: %dMHz\n", freq / 1000000); + freq = decode_pll(mxc_plls[PLL2_CLOCK], CONFIG_MX51_HCLK_FREQ); + printf("mx51 pll2: %dMHz\n", freq / 1000000); + freq = decode_pll(mxc_plls[PLL3_CLOCK], CONFIG_MX51_HCLK_FREQ); + printf("mx51 pll3: %dMHz\n", freq / 1000000); + printf("ipg clock : %dHz\n", mxc_get_clock(MXC_IPG_CLK)); + printf("ipg per clock : %dHz\n", mxc_get_clock(MXC_IPG_PERCLK)); + + return 0; +} + +/***************************************************/ + +U_BOOT_CMD( + clockinfo, CONFIG_SYS_MAXARGS, 1, do_mx51_showclocks, + "display mx51 clocks\n", + "" +); |
