diff options
Diffstat (limited to 'drivers/clk/tegra/clk-tegra210.c')
| -rw-r--r-- | drivers/clk/tegra/clk-tegra210.c | 96 |
1 files changed, 92 insertions, 4 deletions
diff --git a/drivers/clk/tegra/clk-tegra210.c b/drivers/clk/tegra/clk-tegra210.c index 134ba423103d..d038fed3945d 100644 --- a/drivers/clk/tegra/clk-tegra210.c +++ b/drivers/clk/tegra/clk-tegra210.c @@ -9,13 +9,13 @@ #include <linux/clkdev.h> #include <linux/of.h> #include <linux/of_address.h> +#include <linux/syscore_ops.h> #include <linux/delay.h> #include <linux/export.h> #include <linux/mutex.h> #include <linux/clk/tegra.h> #include <dt-bindings/clock/tegra210-car.h> #include <dt-bindings/reset/tegra210-car.h> -#include <linux/iopoll.h> #include <linux/sizes.h> #include <soc/tegra/pmc.h> @@ -221,11 +221,15 @@ #define CLK_M_DIVISOR_SHIFT 2 #define CLK_M_DIVISOR_MASK 0x3 +#define CLK_MASK_ARM 0x44 +#define MISC_CLK_ENB 0x48 + #define RST_DFLL_DVCO 0x2f4 #define DVFS_DFLL_RESET_SHIFT 0 #define CLK_RST_CONTROLLER_RST_DEV_Y_SET 0x2a8 #define CLK_RST_CONTROLLER_RST_DEV_Y_CLR 0x2ac +#define CPU_SOFTRST_CTRL 0x380 #define LVL2_CLK_GATE_OVRA 0xf8 #define LVL2_CLK_GATE_OVRC 0x3a0 @@ -2826,6 +2830,7 @@ static int tegra210_enable_pllu(void) struct tegra_clk_pll_freq_table *fentry; struct tegra_clk_pll pllu; u32 reg; + int ret; for (fentry = pll_u_freq_table; fentry->input_rate; fentry++) { if (fentry->input_rate == pll_ref_freq) @@ -2854,9 +2859,14 @@ static int tegra210_enable_pllu(void) reg |= PLL_ENABLE; writel(reg, clk_base + PLLU_BASE); - readl_relaxed_poll_timeout_atomic(clk_base + PLLU_BASE, reg, - reg & PLL_BASE_LOCK, 2, 1000); - if (!(reg & PLL_BASE_LOCK)) { + /* + * During clocks resume, same PLLU init and enable sequence get + * executed. So, readx_poll_timeout_atomic can't be used here as it + * uses ktime_get() and timekeeping resume doesn't happen by that + * time. So, using tegra210_wait_for_mask for PLL LOCK. + */ + ret = tegra210_wait_for_mask(&pllu, PLLU_BASE, PLL_BASE_LOCK); + if (ret) { pr_err("Timed out waiting for PLL_U to lock\n"); return -ETIMEDOUT; } @@ -3326,6 +3336,77 @@ static void tegra210_disable_cpu_clock(u32 cpu) } #ifdef CONFIG_PM_SLEEP +#define car_readl(_base, _off) readl_relaxed(clk_base + (_base) + ((_off) * 4)) +#define car_writel(_val, _base, _off) \ + writel_relaxed(_val, clk_base + (_base) + ((_off) * 4)) + +static u32 spare_reg_ctx, misc_clk_enb_ctx, clk_msk_arm_ctx; +static u32 cpu_softrst_ctx[3]; + +static int tegra210_clk_suspend(void) +{ + unsigned int i; + + clk_save_context(); + + /* + * Save the bootloader configured clock registers SPARE_REG0, + * MISC_CLK_ENB, CLK_MASK_ARM, CPU_SOFTRST_CTRL. + */ + spare_reg_ctx = readl_relaxed(clk_base + SPARE_REG0); + misc_clk_enb_ctx = readl_relaxed(clk_base + MISC_CLK_ENB); + clk_msk_arm_ctx = readl_relaxed(clk_base + CLK_MASK_ARM); + + for (i = 0; i < ARRAY_SIZE(cpu_softrst_ctx); i++) + cpu_softrst_ctx[i] = car_readl(CPU_SOFTRST_CTRL, i); + + tegra_clk_periph_suspend(); + return 0; +} + +static void tegra210_clk_resume(void) +{ + unsigned int i; + + tegra_clk_osc_resume(clk_base); + + /* + * Restore the bootloader configured clock registers SPARE_REG0, + * MISC_CLK_ENB, CLK_MASK_ARM, CPU_SOFTRST_CTRL from saved context. + */ + writel_relaxed(spare_reg_ctx, clk_base + SPARE_REG0); + writel_relaxed(misc_clk_enb_ctx, clk_base + MISC_CLK_ENB); + writel_relaxed(clk_msk_arm_ctx, clk_base + CLK_MASK_ARM); + + for (i = 0; i < ARRAY_SIZE(cpu_softrst_ctx); i++) + car_writel(cpu_softrst_ctx[i], CPU_SOFTRST_CTRL, i); + + /* + * Tegra clock programming sequence recommends peripheral clock to + * be enabled prior to changing its clock source and divider to + * prevent glitchless frequency switch. + * So, enable all peripheral clocks before restoring their source + * and dividers. + */ + writel_relaxed(TEGRA210_CLK_ENB_VLD_MSK_L, clk_base + CLK_OUT_ENB_L); + writel_relaxed(TEGRA210_CLK_ENB_VLD_MSK_H, clk_base + CLK_OUT_ENB_H); + writel_relaxed(TEGRA210_CLK_ENB_VLD_MSK_U, clk_base + CLK_OUT_ENB_U); + writel_relaxed(TEGRA210_CLK_ENB_VLD_MSK_V, clk_base + CLK_OUT_ENB_V); + writel_relaxed(TEGRA210_CLK_ENB_VLD_MSK_W, clk_base + CLK_OUT_ENB_W); + writel_relaxed(TEGRA210_CLK_ENB_VLD_MSK_X, clk_base + CLK_OUT_ENB_X); + writel_relaxed(TEGRA210_CLK_ENB_VLD_MSK_Y, clk_base + CLK_OUT_ENB_Y); + + /* wait for all writes to happen to have all the clocks enabled */ + fence_udelay(2, clk_base); + + /* restore PLLs and all peripheral clock rates */ + tegra210_init_pllu(); + clk_restore_context(); + + /* restore saved context of peripheral clocks and reset state */ + tegra_clk_periph_resume(); +} + static void tegra210_cpu_clock_suspend(void) { /* switch coresite to clk_m, save off original source */ @@ -3341,6 +3422,11 @@ static void tegra210_cpu_clock_resume(void) } #endif +static struct syscore_ops tegra_clk_syscore_ops = { + .suspend = tegra210_clk_suspend, + .resume = tegra210_clk_resume, +}; + static struct tegra_cpu_car_ops tegra210_cpu_car_ops = { .wait_for_reset = tegra210_wait_cpu_in_reset, .disable_clock = tegra210_disable_cpu_clock, @@ -3625,5 +3711,7 @@ static void __init tegra210_clock_init(struct device_node *np) tegra210_mbist_clk_init(); tegra_cpu_car_ops = &tegra210_cpu_car_ops; + + register_syscore_ops(&tegra_clk_syscore_ops); } CLK_OF_DECLARE(tegra210, "nvidia,tegra210-car", tegra210_clock_init); |