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Message-Id: <1420541578-27968-4-git-send-email-mikko.perttunen@kapsi.fi>
Date: Tue, 6 Jan 2015 12:52:58 +0200
From: Mikko Perttunen <mikko.perttunen@...si.fi>
To: swarren@...dotorg.org, thierry.reding@...il.com, gnurou@...il.com
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-tegra@...r.kernel.org, wni@...dia.com,
Mikko Perttunen <mperttunen@...dia.com>
Subject: [PATCH v5 3/3] ARM: tegra: Add thermal reset (thermtrip) support to PMC
From: Mikko Perttunen <mperttunen@...dia.com>
This adds a device tree controlled option to enable PMC-based
thermal reset in overheating situations. Thermtrip is supported on
Tegra30, Tegra114 and Tegra124. The thermal reset only works when
the thermal sensors are calibrated, so a soctherm driver is also
required.
The thermtrip event is triggered by the soctherm block, and all
soctherm sensors default to showing a temperature of zero Celsius
before they are initialized. Because of this, it is safe to initialize
thermtrip and soctherm in any order.
Signed-off-by: Mikko Perttunen <mperttunen@...dia.com>
---
drivers/soc/tegra/pmc.c | 107 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 107 insertions(+)
diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
index a2c0ceb..9ed8be5 100644
--- a/drivers/soc/tegra/pmc.c
+++ b/drivers/soc/tegra/pmc.c
@@ -83,11 +83,28 @@
#define GPU_RG_CNTRL 0x2d4
+#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
+
struct tegra_pmc_soc {
unsigned int num_powergates;
const char *const *powergates;
unsigned int num_cpu_powergates;
const u8 *cpu_powergates;
+ bool has_tsense_reset;
};
/**
@@ -703,6 +720,90 @@ static void tegra_pmc_init(struct tegra_pmc *pmc)
tegra_pmc_writel(value, PMC_CNTRL);
}
+static const struct of_device_id tegra_pmc_match[];
+
+void tegra_pmc_init_tsense_reset(struct device *dev)
+{
+ u32 pmu_i2c_addr, i2c_ctrl_id, reg_addr, reg_data, pinmux;
+ u32 value, checksum;
+ struct device_node *np = dev->of_node;
+ struct device_node *tt_np;
+ const struct of_device_id *match = of_match_node(tegra_pmc_match, np);
+ const struct tegra_pmc_soc *data = match->data;
+
+ if (!data->has_tsense_reset)
+ return;
+
+ tt_np = of_find_node_by_name(np, "i2c-thermtrip");
+ if (!tt_np) {
+ dev_warn(dev, "no i2c-thermtrip node found, disabling emergency thermal reset\n");
+ return;
+ }
+
+ if (of_property_read_u32(tt_np, "nvidia,i2c-controller-id", &i2c_ctrl_id)) {
+ dev_err(dev, "I2C bus controller id missing, disabling emergency thermal reset\n");
+ goto put_tt;
+ }
+
+ if (of_property_read_u32(tt_np, "nvidia,bus-addr", &pmu_i2c_addr)) {
+ dev_err(dev, "nvidia,bus-addr missing, disabling emergency thermal reset\n");
+ goto put_tt;
+ }
+
+ if (of_property_read_u32(tt_np, "nvidia,reg-addr", ®_addr)) {
+ dev_err(dev, "nvidia,reg-addr missing, disabling emergency thermal reset\n");
+ goto put_tt;
+ }
+
+ if (of_property_read_u32(tt_np, "nvidia,reg-data", ®_data)) {
+ dev_err(dev, "nvidia,reg-data missing, disabling emergency thermal reset\n");
+ goto put_tt;
+ }
+
+ if (of_property_read_u32(tt_np, "nvidia,pinmux-id", &pinmux))
+ pinmux = 0;
+
+ of_node_put(tt_np);
+
+ value = tegra_pmc_readl(PMC_SENSOR_CTRL);
+ value |= PMC_SENSOR_CTRL_SCRATCH_WRITE;
+ tegra_pmc_writel(value, PMC_SENSOR_CTRL);
+
+ value = (reg_data << PMC_SCRATCH54_DATA_SHIFT) |
+ (reg_addr << PMC_SCRATCH54_ADDR_SHIFT);
+ tegra_pmc_writel(value, PMC_SCRATCH54);
+
+ value = 0;
+ value |= PMC_SCRATCH55_RESET_TEGRA;
+ value |= i2c_ctrl_id << PMC_SCRATCH55_CNTRL_ID_SHIFT;
+ value |= pinmux << PMC_SCRATCH55_PINMUX_SHIFT;
+ value |= pmu_i2c_addr << PMC_SCRATCH55_I2CSLV1_SHIFT;
+
+ /* Calculate checksum of SCRATCH54, SCRATCH55 fields.
+ * Bits 23:16 will contain the checksum and are currently zero,
+ * so they are not added.
+ */
+ checksum = reg_addr + reg_data + (value & 0xff) + ((value >> 8) & 0xff)
+ + ((value >> 24) & 0xff);
+ checksum &= 0xff;
+ checksum = 0x100 - checksum;
+
+ value |= checksum << PMC_SCRATCH55_CHECKSUM_SHIFT;
+
+ tegra_pmc_writel(value, PMC_SCRATCH55);
+
+ value = tegra_pmc_readl(PMC_SENSOR_CTRL);
+ value |= PMC_SENSOR_CTRL_ENABLE_RST;
+ tegra_pmc_writel(value, PMC_SENSOR_CTRL);
+
+ dev_info(dev, "PMC emergency thermal reset enabled\n");
+
+ return;
+
+put_tt:
+ of_node_put(tt_np);
+}
+
static int tegra_pmc_probe(struct platform_device *pdev)
{
void __iomem *base = pmc->base;
@@ -730,6 +831,8 @@ static int tegra_pmc_probe(struct platform_device *pdev)
tegra_pmc_init(pmc);
+ tegra_pmc_init_tsense_reset(&pdev->dev);
+
if (IS_ENABLED(CONFIG_DEBUG_FS)) {
err = tegra_powergate_debugfs_init();
if (err < 0)
@@ -772,6 +875,7 @@ static const struct tegra_pmc_soc tegra20_pmc_soc = {
.powergates = tegra20_powergates,
.num_cpu_powergates = 0,
.cpu_powergates = NULL,
+ .has_tsense_reset = false,
};
static const char * const tegra30_powergates[] = {
@@ -803,6 +907,7 @@ static const struct tegra_pmc_soc tegra30_pmc_soc = {
.powergates = tegra30_powergates,
.num_cpu_powergates = ARRAY_SIZE(tegra30_cpu_powergates),
.cpu_powergates = tegra30_cpu_powergates,
+ .has_tsense_reset = true,
};
static const char * const tegra114_powergates[] = {
@@ -838,6 +943,7 @@ static const struct tegra_pmc_soc tegra114_pmc_soc = {
.powergates = tegra114_powergates,
.num_cpu_powergates = ARRAY_SIZE(tegra114_cpu_powergates),
.cpu_powergates = tegra114_cpu_powergates,
+ .has_tsense_reset = true,
};
static const char * const tegra124_powergates[] = {
@@ -879,6 +985,7 @@ static const struct tegra_pmc_soc tegra124_pmc_soc = {
.powergates = tegra124_powergates,
.num_cpu_powergates = ARRAY_SIZE(tegra124_cpu_powergates),
.cpu_powergates = tegra124_cpu_powergates,
+ .has_tsense_reset = true,
};
static const struct of_device_id tegra_pmc_match[] = {
--
2.1.3
--
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