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Subject[PATCH v3 7/7] clk: tegra124: add suspend/resume function for tegra_cpu_car_ops
Date
From: Joseph Lo <josephl@nvidia.com>

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>
Acked-by: Stephen Warren <swarren@nvidia.com>
---
drivers/clk/tegra/clk-tegra124.c | 27 +++++++++++++++++++++++++++
1 files changed, 27 insertions(+), 0 deletions(-)

diff --git a/drivers/clk/tegra/clk-tegra124.c b/drivers/clk/tegra/clk-tegra124.c
index a4117f3..fa6bf84 100644
--- a/drivers/clk/tegra/clk-tegra124.c
+++ b/drivers/clk/tegra/clk-tegra124.c
@@ -28,6 +28,7 @@
#include "clk.h"
#include "clk-id.h"

+#define CLK_SOURCE_CSITE 0x1d4
#define CLK_SOURCE_EMC 0x19c
#define CLK_SOURCE_XUSB_SS_SRC 0x610

@@ -117,6 +118,12 @@
/* 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;
+} tegra124_cpu_clk_sctx;
+#endif
+
static void __iomem *clk_base;
static void __iomem *pmc_base;

@@ -1307,9 +1314,29 @@ static void tegra124_disable_cpu_clock(u32 cpu)
/* flow controller would take care in the power sequence. */
}

+#ifdef CONFIG_PM_SLEEP
+static void tegra124_cpu_clock_suspend(void)
+{
+ /* switch coresite to clk_m, save off original source */
+ tegra124_cpu_clk_sctx.clk_csite_src =
+ readl(clk_base + CLK_SOURCE_CSITE);
+ writel(3 << 30, clk_base + CLK_SOURCE_CSITE);
+}
+
+static void tegra124_cpu_clock_resume(void)
+{
+ writel(tegra124_cpu_clk_sctx.clk_csite_src,
+ clk_base + CLK_SOURCE_CSITE);
+}
+#endif
+
static struct tegra_cpu_car_ops tegra124_cpu_car_ops = {
.wait_for_reset = tegra124_wait_cpu_in_reset,
.disable_clock = tegra124_disable_cpu_clock,
+#ifdef CONFIG_PM_SLEEP
+ .suspend = tegra124_cpu_clock_suspend,
+ .resume = tegra124_cpu_clock_resume,
+#endif
};

static const struct of_device_id pmc_match[] __initconst = {
--
1.7.7.rc0.72.g4b5ea.dirty


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