diff options
Diffstat (limited to 'drivers/clk')
| -rw-r--r-- | drivers/clk/samsung/clk-exynos4.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/drivers/clk/samsung/clk-exynos4.c b/drivers/clk/samsung/clk-exynos4.c index 3effe7a..1563ea8 100644 --- a/drivers/clk/samsung/clk-exynos4.c +++ b/drivers/clk/samsung/clk-exynos4.c @@ -119,11 +119,27 @@ #define GATE_SCLK_CPU 0x14800 #define GATE_IP_CPU 0x14900 #define CLKOUT_CMU_CPU 0x14a00 +#define PWR_CTRL1 0x15020 +#define E4X12_PWR_CTRL2 0x15024 #define E4X12_DIV_ISP0 0x18300 #define E4X12_DIV_ISP1 0x18304 #define E4X12_GATE_ISP0 0x18800 #define E4X12_GATE_ISP1 0x18804 +/* Below definitions are used for PWR_CTRL settings */ +#define PWR_CTRL1_CORE2_DOWN_RATIO(x) (((x) & 0x7) << 28) +#define PWR_CTRL1_CORE1_DOWN_RATIO(x) (((x) & 0x7) << 16) +#define PWR_CTRL1_DIV2_DOWN_EN (1 << 9) +#define PWR_CTRL1_DIV1_DOWN_EN (1 << 8) +#define PWR_CTRL1_USE_CORE3_WFE (1 << 7) +#define PWR_CTRL1_USE_CORE2_WFE (1 << 6) +#define PWR_CTRL1_USE_CORE1_WFE (1 << 5) +#define PWR_CTRL1_USE_CORE0_WFE (1 << 4) +#define PWR_CTRL1_USE_CORE3_WFI (1 << 3) +#define PWR_CTRL1_USE_CORE2_WFI (1 << 2) +#define PWR_CTRL1_USE_CORE1_WFI (1 << 1) +#define PWR_CTRL1_USE_CORE0_WFI (1 << 0) + /* the exynos4 soc type */ enum exynos4_soc { EXYNOS4210, @@ -160,6 +176,7 @@ static unsigned long exynos4210_clk_save[] __initdata = { E4210_GATE_IP_LCD1, E4210_GATE_IP_PERIR, E4210_MPLL_CON0, + PWR_CTRL1, }; static unsigned long exynos4x12_clk_save[] __initdata = { @@ -169,6 +186,8 @@ static unsigned long exynos4x12_clk_save[] __initdata = { E4X12_DIV_ISP, E4X12_DIV_CAM1, E4X12_MPLL_CON0, + PWR_CTRL1, + E4X12_PWR_CTRL2, }; static unsigned long exynos4_clk_pll_regs[] __initdata = { @@ -1337,6 +1356,32 @@ static struct samsung_pll_clock exynos4x12_plls[nr_plls] __initdata = { VPLL_LOCK, VPLL_CON0, NULL), }; +static void __init exynos4_core_down_clock(enum exynos4_soc soc) +{ + unsigned int tmp; + + /* + * Enable arm clock down (in idle) and set arm divider + * ratios in WFI/WFE state. + */ + tmp = (PWR_CTRL1_CORE2_DOWN_RATIO(7) | PWR_CTRL1_CORE1_DOWN_RATIO(7) | + PWR_CTRL1_DIV2_DOWN_EN | PWR_CTRL1_DIV1_DOWN_EN | + PWR_CTRL1_USE_CORE1_WFE | PWR_CTRL1_USE_CORE0_WFE | + PWR_CTRL1_USE_CORE1_WFI | PWR_CTRL1_USE_CORE0_WFI); + /* On Exynos4412 enable it also on core 2 and 3 */ + if (num_possible_cpus() == 4) + tmp |= PWR_CTRL1_USE_CORE3_WFE | PWR_CTRL1_USE_CORE2_WFE | + PWR_CTRL1_USE_CORE3_WFI | PWR_CTRL1_USE_CORE2_WFI; + __raw_writel(tmp, reg_base + PWR_CTRL1); + + /* + * Disable the clock up feature on Exynos4x12, in case it was + * enabled by bootloader. + */ + if (exynos4_soc == EXYNOS4X12) + __raw_writel(0x0, reg_base + E4X12_PWR_CTRL2); +} + /* register exynos4 clocks */ static void __init exynos4_clk_init(struct device_node *np, enum exynos4_soc soc) @@ -1431,6 +1476,7 @@ static void __init exynos4_clk_init(struct device_node *np, samsung_clk_register_alias(ctx, exynos4_aliases, ARRAY_SIZE(exynos4_aliases)); + exynos4_core_down_clock(soc); exynos4_clk_sleep_init(); samsung_clk_of_add_provider(np, ctx); |