diff options
| author | Joseph Lo <josephl@nvidia.com> | 2013-05-20 18:39:28 +0800 |
|---|---|---|
| committer | Stephen Warren <swarren@nvidia.com> | 2013-05-22 15:19:22 -0600 |
| commit | 31972fd95527a5942b777e89404501d5421a0df0 (patch) | |
| tree | 5d49004a70546486376fc947274c082a1af4c111 /drivers/clk/tegra | |
| parent | 18901e9f4fc9c99667516974d82c437453f83348 (diff) | |
clk: tegra114: implement wait_for_reset and disable_clock for tegra_cpu_car_ops
The conventional CPU hotplug sequence on the other Tegra chips, we will also
clock gate the CPU in tegra_cpu_kill() after the CPU was power gated. For
Tegra114, the flow controller will clock gate the CPU after the power down
sequence. But we still need to implement a empty function for disable_clock
to avoid kernel warning message.
Signed-off-by: Joseph Lo <josephl@nvidia.com>
Acked-by: Mike Turquette <mturquette@linaro.org>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Diffstat (limited to 'drivers/clk/tegra')
| -rw-r--r-- | drivers/clk/tegra/clk-tegra114.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/drivers/clk/tegra/clk-tegra114.c b/drivers/clk/tegra/clk-tegra114.c index d78e16ee161c..40d939d091bf 100644 --- a/drivers/clk/tegra/clk-tegra114.c +++ b/drivers/clk/tegra/clk-tegra114.c @@ -250,6 +250,9 @@ #define CLK_SOURCE_XUSB_DEV_SRC 0x60c #define CLK_SOURCE_EMC 0x19c +/* Tegra CPU clock and reset control regs */ +#define CLK_RST_CONTROLLER_CPU_CMPLX_STATUS 0x470 + static int periph_clk_enb_refcnt[CLK_OUT_ENB_NUM * 32]; static void __iomem *clk_base; @@ -2000,7 +2003,25 @@ static __init void tegra114_periph_clk_init(void __iomem *clk_base) } } -static struct tegra_cpu_car_ops tegra114_cpu_car_ops; +/* Tegra114 CPU clock and reset control functions */ +static void tegra114_wait_cpu_in_reset(u32 cpu) +{ + unsigned int reg; + + do { + reg = readl(clk_base + CLK_RST_CONTROLLER_CPU_CMPLX_STATUS); + cpu_relax(); + } while (!(reg & (1 << cpu))); /* check CPU been reset or not */ +} +static void tegra114_disable_cpu_clock(u32 cpu) +{ + /* flow controller would take care in the power sequence. */ +} + +static struct tegra_cpu_car_ops tegra114_cpu_car_ops = { + .wait_for_reset = tegra114_wait_cpu_in_reset, + .disable_clock = tegra114_disable_cpu_clock, +}; static const struct of_device_id pmc_match[] __initconst = { { .compatible = "nvidia,tegra114-pmc" }, |