This adds a device tree controlled option to enable PMC-based
thermal reset in overheating situations. Thermtrip is supported on
Tegra114 and Tegra124. The thermal reset only works when the thermal
sensors are calibrated, so a soctherm driver is also required.
Signed-off-by: Mikko Perttunen <mperttu...@nvidia.com>
---
arch/arm/mach-tegra/pmc.c | 95 +++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 91 insertions(+), 4 deletions(-)
diff --git a/arch/arm/mach-tegra/pmc.c b/arch/arm/mach-tegra/pmc.c
index e1677c0..69143cd 100644
--- a/arch/arm/mach-tegra/pmc.c
+++ b/arch/arm/mach-tegra/pmc.c
@@ -51,6 +51,22 @@
#define PMC_CPUPWRGOOD_TIMER 0xc8
#define PMC_CPUPWROFF_TIMER 0xcc
+#define PMC_SENSOR_CTRL 0x1b0
+#define PMC_SENSOR_CTRL_SCRATCH_WRITE (1 << 2)
+#define PMC_SENSOR_CTRL_ENABLE_RST (1 << 1)
+
+#define PMC_SCRATCH54 0x258
+#define PMC_SCRATCH54_DATA_SHIFT 8
+#define PMC_SCRATCH54_ADDR_SHIFT 0
+
+#define PMC_SCRATCH55 0x25c
+#define PMC_SCRATCH55_RESET_TEGRA (1 << 31)
+#define PMC_SCRATCH55_CNTRL_ID_SHIFT 27
+#define PMC_SCRATCH55_PINMUX_SHIFT 24
+#define PMC_SCRATCH55_16BITOP (1 << 15)
+#define PMC_SCRATCH55_CHECKSUM_SHIFT 16
+#define PMC_SCRATCH55_I2CSLV1_SHIFT 0
+
static u8 tegra_cpu_domains[] = {
0xFF, /* not available for CPU0 */
TEGRA_POWERGATE_CPU1,
@@ -295,11 +311,19 @@ void tegra_pmc_suspend_init(void)
}
#endif
+#define PMC_HAS_THERMAL_RESET (1 << 0)
+
static const struct of_device_id matches[] __initconst = {
- { .compatible = "nvidia,tegra124-pmc" },
- { .compatible = "nvidia,tegra114-pmc" },
- { .compatible = "nvidia,tegra30-pmc" },
- { .compatible = "nvidia,tegra20-pmc" },
+ {
+ .compatible = "nvidia,tegra124-pmc",
+ .data = (void *)PMC_HAS_THERMAL_RESET
+ },
+ {
+ .compatible = "nvidia,tegra114-pmc",
+ .data = (void *)PMC_HAS_THERMAL_RESET
+ },
+ { .compatible = "nvidia,tegra30-pmc", .data = 0 },
+ { .compatible = "nvidia,tegra20-pmc", .data = 0 },
{ }
};
@@ -324,6 +348,67 @@ void __init tegra_pmc_init_irq(void)
tegra_pmc_writel(val, PMC_CTRL);
}
+void __init tegra_pmc_init_thermal_reset(struct device_node *np)
+{
+ u32 pmu_i2c_addr, i2c_ctrl_id, reg_addr, reg_data, pinmux;
+ bool pmu_16bit_ops;
+ u32 val, checksum;
+ const struct of_device_id *match = of_match_node(matches, np);
+
+ if (!((u32)match->data & PMC_HAS_THERMAL_RESET))
+ return;
+
+ pmu_16bit_ops =
+ of_property_read_bool(np, "nvidia,thermtrip-pmu-16bit-ops");
+ if (of_property_read_u32(
+ np, "nvidia,thermtrip-pmu-i2c-addr", &pmu_i2c_addr))
+ goto disabled;
+ if (of_property_read_u32(
+ np, "nvidia,thermtrip-i2c-controller", &i2c_ctrl_id))
+ goto disabled;
+ if (of_property_read_u32(
+ np, "nvidia,thermtrip-reg-addr", ®_addr))
+ goto disabled;
+ if (of_property_read_u32(
+ np, "nvidia,thermtrip-reg-data", ®_data))
+ goto disabled;
+ if (of_property_read_u32(
+ np, "nvidia,thermtrip-pinmux", &pinmux))
+ pinmux = 0;
+
+ val = tegra_pmc_readl(PMC_SENSOR_CTRL);
+ val |= PMC_SENSOR_CTRL_SCRATCH_WRITE | PMC_SENSOR_CTRL_ENABLE_RST;
+ tegra_pmc_writel(val, PMC_SENSOR_CTRL);
+
+ val = (reg_data << PMC_SCRATCH54_DATA_SHIFT) |
+ (reg_addr << PMC_SCRATCH54_ADDR_SHIFT);
+ tegra_pmc_writel(val, PMC_SCRATCH54);
+
+ val = 0;
+ val |= PMC_SCRATCH55_RESET_TEGRA;
+ val |= i2c_ctrl_id << PMC_SCRATCH55_CNTRL_ID_SHIFT;
+ val |= pinmux << PMC_SCRATCH55_PINMUX_SHIFT;
+ if (pmu_16bit_ops)
+ val |= PMC_SCRATCH55_16BITOP;
+ val |= pmu_i2c_addr << PMC_SCRATCH55_I2CSLV1_SHIFT;
+
+ checksum = reg_addr + reg_data + (val & 0xFF) + ((val >> 8) & 0xFF) +
+ ((val >> 24) & 0xFF);
+ checksum &= 0xFF;
+ checksum = 0x100 - checksum;
+
+ val |= checksum << PMC_SCRATCH55_CHECKSUM_SHIFT;
+
+ tegra_pmc_writel(val, PMC_SCRATCH55);
+
+ pr_info("Tegra: PMC thermal reset enabled\n");
+
+ return;
+
+disabled:
+ pr_warn("Tegra: PMC thermal reset disabled\n");
+}
+
void __init tegra_pmc_init(void)
{
struct device_node *np;
@@ -399,4 +484,6 @@ void __init tegra_pmc_init(void)
pmc_pm_data.lp0_vec_size = lp0_vec[1];
pmc_pm_data.suspend_mode = suspend_mode;
+
+ tegra_pmc_init_thermal_reset(np);
}
--
1.8.1.5
--
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