diff options
Diffstat (limited to 'arch/arm/cpu/armv7/mx6')
-rw-r--r-- | arch/arm/cpu/armv7/mx6/clock.c | 23 | ||||
-rw-r--r-- | arch/arm/cpu/armv7/mx6/soc.c | 110 |
2 files changed, 114 insertions, 19 deletions
diff --git a/arch/arm/cpu/armv7/mx6/clock.c b/arch/arm/cpu/armv7/mx6/clock.c index 873d9d0..fcc4f35 100644 --- a/arch/arm/cpu/armv7/mx6/clock.c +++ b/arch/arm/cpu/armv7/mx6/clock.c @@ -94,7 +94,7 @@ static u32 decode_pll(enum pll_clocks pll, u32 infreq) div = __raw_readl(&imx_ccm->analog_pll_enet); div &= BM_ANADIG_PLL_ENET_DIV_SELECT; - return (div == 3 ? 125000000 : 25000000 * (div << 1)); + return 25000000 * (div + (div >> 1) + 1); default: return 0; } @@ -310,7 +310,18 @@ static u32 get_mmdc_ch0_clk(void) return freq / (podf + 1); } +#else +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); +} +#endif +#ifdef CONFIG_FEC_MXC int enable_fec_anatop_clock(void) { u32 reg = 0; @@ -339,16 +350,6 @@ int enable_fec_anatop_clock(void) return 0; } - -#else -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); -} #endif static u32 get_usdhc_clk(u32 port) diff --git a/arch/arm/cpu/armv7/mx6/soc.c b/arch/arm/cpu/armv7/mx6/soc.c index a390296..009a644 100644 --- a/arch/arm/cpu/armv7/mx6/soc.c +++ b/arch/arm/cpu/armv7/mx6/soc.c @@ -19,6 +19,14 @@ #include <asm/arch/mxc_hdmi.h> #include <asm/arch/crm_regs.h> +#define VDDPU_MASK (0x1f << 9) + +enum ldo_reg { + LDO_ARM, + LDO_SOC, + LDO_PU, +}; + struct scu_regs { u32 ctrl; u32 config; @@ -93,6 +101,20 @@ void init_aips(void) writel(0x00000000, &aips2->opacr4); } +static void clear_ldo_ramp(void) +{ + struct anatop_regs *anatop = (struct anatop_regs *)ANATOP_BASE_ADDR; + int reg; + + /* ROM may modify LDO ramp up time according to fuse setting, so in + * order to be in the safe side we neeed to reset these settings to + * match the reset value: 0'b00 + */ + reg = readl(&anatop->ana_misc2); + reg &= ~(0x3f << 24); + writel(reg, &anatop->ana_misc2); +} + /* * Set the VDDSOC * @@ -101,10 +123,11 @@ void init_aips(void) * Possible values are from 0.725V to 1.450V in steps of * 0.025V (25mV). */ -void set_vddsoc(u32 mv) +static int set_ldo_voltage(enum ldo_reg ldo, u32 mv) { struct anatop_regs *anatop = (struct anatop_regs *)ANATOP_BASE_ADDR; - u32 val, reg = readl(&anatop->reg_core); + u32 val, step, old, reg = readl(&anatop->reg_core); + u8 shift; if (mv < 725) val = 0x00; /* Power gated off */ @@ -113,12 +136,37 @@ void set_vddsoc(u32 mv) else val = (mv - 700) / 25; + clear_ldo_ramp(); + + switch (ldo) { + case LDO_SOC: + shift = 18; + break; + case LDO_PU: + shift = 9; + break; + case LDO_ARM: + shift = 0; + break; + default: + return -EINVAL; + } + + old = (reg & (0x1F << shift)) >> shift; + step = abs(val - old); + if (step == 0) + return 0; + + reg = (reg & ~(0x1F << shift)) | (val << shift); + writel(reg, &anatop->reg_core); + /* - * Mask out the REG_CORE[22:18] bits (REG2_TRIG) - * and set them to the calculated value (0.7V + val * 0.25V) + * The LDO ramp-up is based on 64 clock cycles of 24 MHz = 2.6 us per + * step */ - reg = (reg & ~(0x1F << 18)) | (val << 18); - writel(reg, &anatop->reg_core); + udelay(3 * step); + + return 0; } static void imx_set_wdog_powerdown(bool enable) @@ -131,13 +179,50 @@ static void imx_set_wdog_powerdown(bool enable) writew(enable, &wdog2->wmcr); } +static void imx_set_vddpu_power_down(void) +{ + struct anatop_regs *anatop = (struct anatop_regs *)ANATOP_BASE_ADDR; + struct gpc_regs *gpc = (struct gpc_regs *)GPC_BASE_ADDR; + + u32 reg; + + /* + * Disable the brown out detection since we are going to be + * disabling the LDO. + */ + reg = readl(&anatop->ana_misc2); + reg &= ~ANADIG_ANA_MISC2_REG1_BO_EN; + writel(reg, &anatop->ana_misc2); + + /* need to power down xPU in GPC before turning off PU LDO */ + reg = readl(&gpc->gpu_ctrl); + writel(reg | 0x1, &gpc->gpu_ctrl); + + reg = readl(&gpc->ctrl); + writel(reg | 0x1, &gpc->ctrl); + while (readl(&gpc->ctrl) & 0x1) + ; + + /* Mask the ANATOP brown out interrupt in the GPC. */ + reg = readl(&gpc->imr4); + reg |= 0x80000000; + writel(reg, &gpc->imr4); + + /* disable VDDPU */ + writel(VDDPU_MASK, &anatop->reg_core_clr); + + /* Clear the BO interrupt in the ANATOP. */ + reg = readl(&anatop->ana_misc1); + reg |= 0x80000000; + writel(reg, &anatop->ana_misc1); +} + int arch_cpu_init(void) { init_aips(); - set_vddsoc(1200); /* Set VDDSOC to 1.2V */ - imx_set_wdog_powerdown(false); /* Disable PDE bit of WMCR register */ + imx_set_vddpu_power_down(); #ifdef CONFIG_APBH_DMA /* Start APBH DMA */ @@ -147,9 +232,18 @@ int arch_cpu_init(void) return 0; } +int board_postclk_init(void) +{ + set_ldo_voltage(LDO_SOC, 1175); /* Set VDDSOC to 1.175V */ + + return 0; +} + #ifndef CONFIG_SYS_DCACHE_OFF void enable_caches(void) { + /* Avoid random hang when download by usb */ + invalidate_dcache_all(); /* Enable D-cache. I-cache is already enabled in start.S */ dcache_enable(); } |