From: Otavio Salvador otavio@ossystems.com.br
The MX23 has different handling of the SSP clock and GPMI NAND clock sources, add necessary quirks into the clock code to properly handle these.
Signed-off-by: Marek Vasut marex@denx.de Signed-off-by: Otavio Salvador otavio@ossystems.com.br Cc: Fabio Estevam fabio.estevam@freescale.com Cc: Stefano Babic sbabic@denx.de --- arch/arm/cpu/arm926ejs/mxs/clock.c | 44 +++++++++++++++++++++++++-------- arch/arm/include/asm/arch-mxs/clock.h | 8 ++++-- 2 files changed, 40 insertions(+), 12 deletions(-)
diff --git a/arch/arm/cpu/arm926ejs/mxs/clock.c b/arch/arm/cpu/arm926ejs/mxs/clock.c index b7cf98f..2df7ec6 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 @@ -32,15 +32,24 @@ #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)
+#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 = @@ -120,10 +129,17 @@ 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;
+ clkseq = readl(&clkctrl_regs->hw_clkctrl_clkseq); clkctrl = readl(&clkctrl_regs->hw_clkctrl_gpmi);
@@ -134,7 +150,7 @@ static uint32_t mxs_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; @@ -203,7 +219,7 @@ void mxs_set_sspclk(enum mxs_sspclock ssp, uint32_t freq, int xtal) (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) + @@ -248,7 +264,7 @@ static uint32_t mxs_get_sspclk(enum mxs_sspclock ssp) 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); @@ -273,8 +289,14 @@ static uint32_t mxs_get_sspclk(enum mxs_sspclock ssp) */ void mxs_set_ssp_busclock(unsigned int bus, uint32_t freq) { +#if defined(CONFIG_MX23) + const unsigned int clkbus = 0; +#elif defined(CONFIG_MX28) + const unsigned int clkbus = bus; +#endif + struct mxs_ssp_regs *ssp_regs; - const uint32_t sspclk = mxs_get_sspclk(bus); + const uint32_t sspclk = mxs_get_sspclk(clkbus); uint32_t reg; uint32_t divide, rate, tgtclk;
@@ -325,16 +347,18 @@ uint32_t mxc_get_clock(enum mxc_clock clk) return mxs_get_ioclk(MXC_IOCLK0); case MXC_IO1_CLK: return mxs_get_ioclk(MXC_IOCLK1); + case MXC_XTAL_CLK: + return XTAL_FREQ_KHZ * 1000; case MXC_SSP0_CLK: return mxs_get_sspclk(MXC_SSPCLK0); +#ifdef CONFIG_MX28 case MXC_SSP1_CLK: return mxs_get_sspclk(MXC_SSPCLK1); case MXC_SSP2_CLK: return mxs_get_sspclk(MXC_SSPCLK2); case MXC_SSP3_CLK: return mxs_get_sspclk(MXC_SSPCLK3); - case MXC_XTAL_CLK: - return XTAL_FREQ_KHZ * 1000; +#endif }
return 0; diff --git a/arch/arm/include/asm/arch-mxs/clock.h b/arch/arm/include/asm/arch-mxs/clock.h index d3927c7..3f7d3f0 100644 --- a/arch/arm/include/asm/arch-mxs/clock.h +++ b/arch/arm/include/asm/arch-mxs/clock.h @@ -1,5 +1,5 @@ /* - * Freescale i.MX28 Clock + * Freescale i.MX23/i.MX28 Clock * * Copyright (C) 2011 Marek Vasut marek.vasut@gmail.com * on behalf of DENX Software Engineering GmbH @@ -31,11 +31,13 @@ enum mxc_clock { MXC_GPMI_CLK, MXC_IO0_CLK, MXC_IO1_CLK, + MXC_XTAL_CLK, MXC_SSP0_CLK, +#ifdef CONFIG_MX28 MXC_SSP1_CLK, MXC_SSP2_CLK, MXC_SSP3_CLK, - MXC_XTAL_CLK, +#endif };
enum mxs_ioclock { @@ -45,9 +47,11 @@ enum mxs_ioclock {
enum mxs_sspclock { MXC_SSPCLK0 = 0, +#ifdef CONFIG_MX28 MXC_SSPCLK1, MXC_SSPCLK2, MXC_SSPCLK3, +#endif };
uint32_t mxc_get_clock(enum mxc_clock clk);