diff options
Diffstat (limited to 'drivers/clk/tegra/clk-tegra114.c')
| -rw-r--r-- | drivers/clk/tegra/clk-tegra114.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/drivers/clk/tegra/clk-tegra114.c b/drivers/clk/tegra/clk-tegra114.c index b6015cb4fc01..806d80366c54 100644 --- a/drivers/clk/tegra/clk-tegra114.c +++ b/drivers/clk/tegra/clk-tegra114.c @@ -290,6 +290,14 @@ /* Tegra CPU clock and reset control regs */ #define CLK_RST_CONTROLLER_CPU_CMPLX_STATUS 0x470 +#ifdef CONFIG_PM_SLEEP +static struct cpu_clk_suspend_context { + u32 clk_csite_src; + u32 cclkg_burst; + u32 cclkg_divider; +} tegra114_cpu_clk_sctx; +#endif + static int periph_clk_enb_refcnt[CLK_OUT_ENB_NUM * 32]; static void __iomem *clk_base; @@ -2142,9 +2150,39 @@ static void tegra114_disable_cpu_clock(u32 cpu) /* flow controller would take care in the power sequence. */ } +#ifdef CONFIG_PM_SLEEP +static void tegra114_cpu_clock_suspend(void) +{ + /* switch coresite to clk_m, save off original source */ + tegra114_cpu_clk_sctx.clk_csite_src = + readl(clk_base + CLK_SOURCE_CSITE); + writel(3 << 30, clk_base + CLK_SOURCE_CSITE); + + tegra114_cpu_clk_sctx.cclkg_burst = + readl(clk_base + CCLKG_BURST_POLICY); + tegra114_cpu_clk_sctx.cclkg_divider = + readl(clk_base + CCLKG_BURST_POLICY + 4); +} + +static void tegra114_cpu_clock_resume(void) +{ + writel(tegra114_cpu_clk_sctx.clk_csite_src, + clk_base + CLK_SOURCE_CSITE); + + writel(tegra114_cpu_clk_sctx.cclkg_burst, + clk_base + CCLKG_BURST_POLICY); + writel(tegra114_cpu_clk_sctx.cclkg_divider, + clk_base + CCLKG_BURST_POLICY + 4); +} +#endif + static struct tegra_cpu_car_ops tegra114_cpu_car_ops = { .wait_for_reset = tegra114_wait_cpu_in_reset, .disable_clock = tegra114_disable_cpu_clock, +#ifdef CONFIG_PM_SLEEP + .suspend = tegra114_cpu_clock_suspend, + .resume = tegra114_cpu_clock_resume, +#endif }; static const struct of_device_id pmc_match[] __initconst = { |