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clk: tegra: add suspend/resume function for tegra_cpu_car_ops

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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>
This commit is contained in:
Joseph Lo 2013-07-03 17:50:44 +08:00 committed by Stephen Warren
parent dd6fe9a927
commit ad7d114083
1 changed files with 26 additions and 0 deletions
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26
drivers/clk/tegra/clk-tegra114.c
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@ -290,6 +290,12 @@
/* Tegra CPU clock and reset control regs */ /* Tegra CPU clock and reset control regs */
#define CLK_RST_CONTROLLER_CPU_CMPLX_STATUS 0x470 #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 int periph_clk_enb_refcnt[CLK_OUT_ENB_NUM * 32];
static void __iomem *clk_base; 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. */ /* 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 = { static struct tegra_cpu_car_ops tegra114_cpu_car_ops = {
.wait_for_reset = tegra114_wait_cpu_in_reset, .wait_for_reset = tegra114_wait_cpu_in_reset,
.disable_clock = tegra114_disable_cpu_clock, .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 = { static const struct of_device_id pmc_match[] __initconst = {