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clk: tegra114: implement wait_for_reset and disable_clock for tegra_cpu_car_ops

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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>
This commit is contained in:
Joseph Lo 2013-05-20 18:39:28 +08:00 committed by Stephen Warren
parent 18901e9f4f
commit 31972fd955
1 changed files with 22 additions and 1 deletions
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23
drivers/clk/tegra/clk-tegra114.c
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@ -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" },