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>

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" },