diff options
Diffstat (limited to 'arch/arm/cpu/arm926ejs/mxs/clock.c')
| -rw-r--r-- | arch/arm/cpu/arm926ejs/mxs/clock.c | 83 |
1 files changed, 50 insertions, 33 deletions
diff --git a/arch/arm/cpu/arm926ejs/mxs/clock.c b/arch/arm/cpu/arm926ejs/mxs/clock.c index 4ff19c3..00b9aba 100644 --- a/arch/arm/cpu/arm926ejs/mxs/clock.c +++ b/arch/arm/cpu/arm926ejs/mxs/clock.c @@ -1,5 +1,5 @@ /* - * Freescale i.MX28 clock setup code + * Freescale i.MX23/i.MX28 clock setup code * * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com> * on behalf of DENX Software Engineering GmbH @@ -32,16 +32,25 @@ #include <asm/arch/clock.h> #include <asm/arch/imx-regs.h> -/* The PLL frequency is always 480MHz, see section 10.2 in iMX28 datasheet. */ +/* + * The PLL frequency is 480MHz and XTAL frequency is 24MHz + * iMX23: datasheet section 4.2 + * iMX28: datasheet section 10.2 + */ #define PLL_FREQ_KHZ 480000 #define PLL_FREQ_COEF 18 -/* The XTAL frequency is always 24MHz, see section 10.2 in iMX28 datasheet. */ #define XTAL_FREQ_KHZ 24000 #define PLL_FREQ_MHZ (PLL_FREQ_KHZ / 1000) #define XTAL_FREQ_MHZ (XTAL_FREQ_KHZ / 1000) -static uint32_t mx28_get_pclk(void) +#if defined(CONFIG_MX23) +#define MXC_SSPCLK_MAX MXC_SSPCLK0 +#elif defined(CONFIG_MX28) +#define MXC_SSPCLK_MAX MXC_SSPCLK3 +#endif + +static uint32_t mxs_get_pclk(void) { struct mxs_clkctrl_regs *clkctrl_regs = (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE; @@ -73,7 +82,7 @@ static uint32_t mx28_get_pclk(void) return (PLL_FREQ_MHZ * PLL_FREQ_COEF / frac) / div; } -static uint32_t mx28_get_hclk(void) +static uint32_t mxs_get_hclk(void) { struct mxs_clkctrl_regs *clkctrl_regs = (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE; @@ -88,10 +97,10 @@ static uint32_t mx28_get_hclk(void) return 0; div = clkctrl & CLKCTRL_HBUS_DIV_MASK; - return mx28_get_pclk() / div; + return mxs_get_pclk() / div; } -static uint32_t mx28_get_emiclk(void) +static uint32_t mxs_get_emiclk(void) { struct mxs_clkctrl_regs *clkctrl_regs = (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE; @@ -116,11 +125,17 @@ static uint32_t mx28_get_emiclk(void) return (PLL_FREQ_MHZ * PLL_FREQ_COEF / frac) / div; } -static uint32_t mx28_get_gpmiclk(void) +static uint32_t mxs_get_gpmiclk(void) { struct mxs_clkctrl_regs *clkctrl_regs = (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE; - +#if defined(CONFIG_MX23) + uint8_t *reg = + &clkctrl_regs->hw_clkctrl_frac0[CLKCTRL_FRAC0_CPU]; +#elif defined(CONFIG_MX28) + uint8_t *reg = + &clkctrl_regs->hw_clkctrl_frac1[CLKCTRL_FRAC1_GPMI]; +#endif uint32_t clkctrl, clkseq, div; uint8_t clkfrac, frac; @@ -134,7 +149,7 @@ static uint32_t mx28_get_gpmiclk(void) } /* REF Path */ - clkfrac = readb(&clkctrl_regs->hw_clkctrl_frac1[CLKCTRL_FRAC1_GPMI]); + clkfrac = readb(reg); frac = clkfrac & CLKCTRL_FRAC_FRAC_MASK; div = clkctrl & CLKCTRL_GPMI_DIV_MASK; return (PLL_FREQ_MHZ * PLL_FREQ_COEF / frac) / div; @@ -143,7 +158,7 @@ static uint32_t mx28_get_gpmiclk(void) /* * Set IO clock frequency, in kHz */ -void mx28_set_ioclk(enum mxs_ioclock io, uint32_t freq) +void mxs_set_ioclk(enum mxs_ioclock io, uint32_t freq) { struct mxs_clkctrl_regs *clkctrl_regs = (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE; @@ -176,7 +191,7 @@ void mx28_set_ioclk(enum mxs_ioclock io, uint32_t freq) /* * Get IO clock, returns IO clock in kHz */ -static uint32_t mx28_get_ioclk(enum mxs_ioclock io) +static uint32_t mxs_get_ioclk(enum mxs_ioclock io) { struct mxs_clkctrl_regs *clkctrl_regs = (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE; @@ -197,13 +212,13 @@ static uint32_t mx28_get_ioclk(enum mxs_ioclock io) /* * Configure SSP clock frequency, in kHz */ -void mx28_set_sspclk(enum mxs_sspclock ssp, uint32_t freq, int xtal) +void mxs_set_sspclk(enum mxs_sspclock ssp, uint32_t freq, int xtal) { struct mxs_clkctrl_regs *clkctrl_regs = (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE; uint32_t clk, clkreg; - if (ssp > MXC_SSPCLK3) + if (ssp > MXC_SSPCLK_MAX) return; clkreg = (uint32_t)(&clkctrl_regs->hw_clkctrl_ssp0) + @@ -216,7 +231,7 @@ void mx28_set_sspclk(enum mxs_sspclock ssp, uint32_t freq, int xtal) if (xtal) clk = XTAL_FREQ_KHZ; else - clk = mx28_get_ioclk(ssp >> 1); + clk = mxs_get_ioclk(ssp >> 1); if (freq > clk) return; @@ -241,14 +256,14 @@ void mx28_set_sspclk(enum mxs_sspclock ssp, uint32_t freq, int xtal) /* * Return SSP frequency, in kHz */ -static uint32_t mx28_get_sspclk(enum mxs_sspclock ssp) +static uint32_t mxs_get_sspclk(enum mxs_sspclock ssp) { struct mxs_clkctrl_regs *clkctrl_regs = (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE; uint32_t clkreg; uint32_t clk, tmp; - if (ssp > MXC_SSPCLK3) + if (ssp > MXC_SSPCLK_MAX) return 0; tmp = readl(&clkctrl_regs->hw_clkctrl_clkseq); @@ -263,7 +278,7 @@ static uint32_t mx28_get_sspclk(enum mxs_sspclock ssp) if (tmp == 0) return 0; - clk = mx28_get_ioclk(ssp >> 1); + clk = mxs_get_ioclk(ssp >> 1); return clk / tmp; } @@ -271,14 +286,14 @@ static uint32_t mx28_get_sspclk(enum mxs_sspclock ssp) /* * Set SSP/MMC bus frequency, in kHz) */ -void mx28_set_ssp_busclock(unsigned int bus, uint32_t freq) +void mxs_set_ssp_busclock(unsigned int bus, uint32_t freq) { struct mxs_ssp_regs *ssp_regs; - const uint32_t sspclk = mx28_get_sspclk(bus); + const uint32_t sspclk = mxs_get_sspclk(bus); uint32_t reg; uint32_t divide, rate, tgtclk; - ssp_regs = (struct mxs_ssp_regs *)(MXS_SSP0_BASE + (bus * 0x2000)); + ssp_regs = mxs_ssp_regs_by_bus(bus); /* * SSP bit rate = SSPCLK / (CLOCK_DIVIDE * (1 + CLOCK_RATE)), @@ -313,28 +328,30 @@ uint32_t mxc_get_clock(enum mxc_clock clk) { switch (clk) { case MXC_ARM_CLK: - return mx28_get_pclk() * 1000000; + return mxs_get_pclk() * 1000000; case MXC_GPMI_CLK: - return mx28_get_gpmiclk() * 1000000; + return mxs_get_gpmiclk() * 1000000; case MXC_AHB_CLK: case MXC_IPG_CLK: - return mx28_get_hclk() * 1000000; + return mxs_get_hclk() * 1000000; case MXC_EMI_CLK: - return mx28_get_emiclk(); + return mxs_get_emiclk(); case MXC_IO0_CLK: - return mx28_get_ioclk(MXC_IOCLK0); + return mxs_get_ioclk(MXC_IOCLK0); case MXC_IO1_CLK: - return mx28_get_ioclk(MXC_IOCLK1); + return mxs_get_ioclk(MXC_IOCLK1); + case MXC_XTAL_CLK: + return XTAL_FREQ_KHZ * 1000; case MXC_SSP0_CLK: - return mx28_get_sspclk(MXC_SSPCLK0); + return mxs_get_sspclk(MXC_SSPCLK0); +#ifdef CONFIG_MX28 case MXC_SSP1_CLK: - return mx28_get_sspclk(MXC_SSPCLK1); + return mxs_get_sspclk(MXC_SSPCLK1); case MXC_SSP2_CLK: - return mx28_get_sspclk(MXC_SSPCLK2); + return mxs_get_sspclk(MXC_SSPCLK2); case MXC_SSP3_CLK: - return mx28_get_sspclk(MXC_SSPCLK3); - case MXC_XTAL_CLK: - return XTAL_FREQ_KHZ * 1000; + return mxs_get_sspclk(MXC_SSPCLK3); +#endif } return 0; |