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authorJoseph Lo <josephl@nvidia.com>2013-07-03 17:50:44 +0800
committerStephen Warren <swarren@nvidia.com>2013-07-19 10:08:08 -0600
commitad7d114083afda5fbbb52488c42b4a17107c6872 (patch)
treef58169470deecbb2ce8ce17b44e49f9c295f5550 /drivers/clk/tegra/clk-tegra114.c
parentdd6fe9a927eaaa98f70b44464a810e6e4d33318c (diff)
clk: tegra: add suspend/resume function for tegra_cpu_car_ops
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 <mturquette@linaro.org> Signed-off-by: Joseph Lo <josephl@nvidia.com> Signed-off-by: Stephen Warren <swarren@nvidia.com>
Diffstat (limited to 'drivers/clk/tegra/clk-tegra114.c')
-rw-r--r--drivers/clk/tegra/clk-tegra114.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/clk/tegra/clk-tegra114.c b/drivers/clk/tegra/clk-tegra114.c
index b6015cb4fc01..f74ed194f723 100644
--- a/drivers/clk/tegra/clk-tegra114.c
+++ b/drivers/clk/tegra/clk-tegra114.c
@@ -290,6 +290,12 @@
/* 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;
+} tegra114_cpu_clk_sctx;
+#endif
+
static int periph_clk_enb_refcnt[CLK_OUT_ENB_NUM * 32];
static void __iomem *clk_base;
@@ -2142,9 +2148,29 @@ 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 = {