From mboxrd@z Thu Jan 1 00:00:00 1970 From: josephl@nvidia.com (Joseph Lo) Date: Tue, 25 Jun 2013 17:27:52 +0800 Subject: [PATCH 08/11] clk: tegra114: add suspend/resume function for tegar_cpu_car_ops In-Reply-To: <1372152475-18617-1-git-send-email-josephl@nvidia.com> References: <1372152475-18617-1-git-send-email-josephl@nvidia.com> Message-ID: <1372152475-18617-9-git-send-email-josephl@nvidia.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Adding suspend/resume function for tegra_cpu_car_ops. We only save and restore the setting of the clock of CoreSight. Other clocks still need to be taken care by clock driver. Cc: Mike Turquette Signed-off-by: Joseph Lo --- drivers/clk/tegra/clk-tegra114.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/drivers/clk/tegra/clk-tegra114.c b/drivers/clk/tegra/clk-tegra114.c index dbd0428..cd51d75 100644 --- a/drivers/clk/tegra/clk-tegra114.c +++ b/drivers/clk/tegra/clk-tegra114.c @@ -258,6 +258,12 @@ #define PMC_PLLM_WB0_OVERRIDE 0x1dc #define PMC_PLLM_WB0_OVERRIDE_2 0x2b0 +#ifdef CONFIG_PM_SLEEP +static struct cpu_clk_suspend_context { + u32 clk_csite_src; +} tegra114_cpu_clk_sctx; +#endif + static int periph_clk_enb_refcnt[CLK_OUT_ENB_NUM * 32]; static void __iomem *clk_base; @@ -2107,9 +2113,29 @@ 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); +} + +static void tegra114_cpu_clock_resume(void) +{ + writel(tegra114_cpu_clk_sctx.clk_csite_src, + clk_base + CLK_SOURCE_CSITE); +} +#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 = { -- 1.8.3.1