[PATCH 5/6] clk: tegra114: implement wait_for_reset and disable_clock for tegra_cpu_car_ops
From: Joseph Lo <hidden>
Date: 2013-05-15 10:27:23
Also in:
linux-tegra
Subsystem:
common clk framework, tegra clock driver, the rest · Maintainers:
Michael Turquette, Stephen Boyd, Prashant Gaikwad, Linus Torvalds
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. Cc: Mike Turquette <redacted> Signed-off-by: Joseph Lo <redacted> --- drivers/clk/tegra/clk-tegra114.c | 23 ++++++++++++++++++++++- 1 file changed, 22 insertions(+), 1 deletion(-)
diff --git a/drivers/clk/tegra/clk-tegra114.c b/drivers/clk/tegra/clk-tegra114.c
index d78e16e..40d939d 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" },
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1.8.2.2