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Date:	Mon, 10 Nov 2014 15:12:17 +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 v4 REPOST 5/5] 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>
Reviewed-by: Wei Ni <wni@...dia.com>
Tested-by: Wei Ni <wni@...dia.com>
---
 drivers/soc/tegra/pmc.c | 379 +++++++++++++++++++++++++++++++-----------------
 1 file changed, 247 insertions(+), 132 deletions(-)

diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
index a2c0ceb..de514fe 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;
 };
 
 /**
@@ -606,6 +623,234 @@ void tegra_pmc_enter_suspend_mode(enum tegra_suspend_mode mode)
 }
 #endif
 
+static const char * const tegra20_powergates[] = {
+	[TEGRA_POWERGATE_CPU] = "cpu",
+	[TEGRA_POWERGATE_3D] = "3d",
+	[TEGRA_POWERGATE_VENC] = "venc",
+	[TEGRA_POWERGATE_VDEC] = "vdec",
+	[TEGRA_POWERGATE_PCIE] = "pcie",
+	[TEGRA_POWERGATE_L2] = "l2",
+	[TEGRA_POWERGATE_MPE] = "mpe",
+};
+
+static const struct tegra_pmc_soc tegra20_pmc_soc = {
+	.num_powergates = ARRAY_SIZE(tegra20_powergates),
+	.powergates = tegra20_powergates,
+	.num_cpu_powergates = 0,
+	.cpu_powergates = NULL,
+};
+
+static const char * const tegra30_powergates[] = {
+	[TEGRA_POWERGATE_CPU] = "cpu0",
+	[TEGRA_POWERGATE_3D] = "3d0",
+	[TEGRA_POWERGATE_VENC] = "venc",
+	[TEGRA_POWERGATE_VDEC] = "vdec",
+	[TEGRA_POWERGATE_PCIE] = "pcie",
+	[TEGRA_POWERGATE_L2] = "l2",
+	[TEGRA_POWERGATE_MPE] = "mpe",
+	[TEGRA_POWERGATE_HEG] = "heg",
+	[TEGRA_POWERGATE_SATA] = "sata",
+	[TEGRA_POWERGATE_CPU1] = "cpu1",
+	[TEGRA_POWERGATE_CPU2] = "cpu2",
+	[TEGRA_POWERGATE_CPU3] = "cpu3",
+	[TEGRA_POWERGATE_CELP] = "celp",
+	[TEGRA_POWERGATE_3D1] = "3d1",
+};
+
+static const u8 tegra30_cpu_powergates[] = {
+	TEGRA_POWERGATE_CPU,
+	TEGRA_POWERGATE_CPU1,
+	TEGRA_POWERGATE_CPU2,
+	TEGRA_POWERGATE_CPU3,
+};
+
+static const struct tegra_pmc_soc tegra30_pmc_soc = {
+	.num_powergates = ARRAY_SIZE(tegra30_powergates),
+	.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[] = {
+	[TEGRA_POWERGATE_CPU] = "crail",
+	[TEGRA_POWERGATE_3D] = "3d",
+	[TEGRA_POWERGATE_VENC] = "venc",
+	[TEGRA_POWERGATE_VDEC] = "vdec",
+	[TEGRA_POWERGATE_MPE] = "mpe",
+	[TEGRA_POWERGATE_HEG] = "heg",
+	[TEGRA_POWERGATE_CPU1] = "cpu1",
+	[TEGRA_POWERGATE_CPU2] = "cpu2",
+	[TEGRA_POWERGATE_CPU3] = "cpu3",
+	[TEGRA_POWERGATE_CELP] = "celp",
+	[TEGRA_POWERGATE_CPU0] = "cpu0",
+	[TEGRA_POWERGATE_C0NC] = "c0nc",
+	[TEGRA_POWERGATE_C1NC] = "c1nc",
+	[TEGRA_POWERGATE_DIS] = "dis",
+	[TEGRA_POWERGATE_DISB] = "disb",
+	[TEGRA_POWERGATE_XUSBA] = "xusba",
+	[TEGRA_POWERGATE_XUSBB] = "xusbb",
+	[TEGRA_POWERGATE_XUSBC] = "xusbc",
+};
+
+static const u8 tegra114_cpu_powergates[] = {
+	TEGRA_POWERGATE_CPU0,
+	TEGRA_POWERGATE_CPU1,
+	TEGRA_POWERGATE_CPU2,
+	TEGRA_POWERGATE_CPU3,
+};
+
+static const struct tegra_pmc_soc tegra114_pmc_soc = {
+	.num_powergates = ARRAY_SIZE(tegra114_powergates),
+	.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[] = {
+	[TEGRA_POWERGATE_CPU] = "crail",
+	[TEGRA_POWERGATE_3D] = "3d",
+	[TEGRA_POWERGATE_VENC] = "venc",
+	[TEGRA_POWERGATE_PCIE] = "pcie",
+	[TEGRA_POWERGATE_VDEC] = "vdec",
+	[TEGRA_POWERGATE_L2] = "l2",
+	[TEGRA_POWERGATE_MPE] = "mpe",
+	[TEGRA_POWERGATE_HEG] = "heg",
+	[TEGRA_POWERGATE_SATA] = "sata",
+	[TEGRA_POWERGATE_CPU1] = "cpu1",
+	[TEGRA_POWERGATE_CPU2] = "cpu2",
+	[TEGRA_POWERGATE_CPU3] = "cpu3",
+	[TEGRA_POWERGATE_CELP] = "celp",
+	[TEGRA_POWERGATE_CPU0] = "cpu0",
+	[TEGRA_POWERGATE_C0NC] = "c0nc",
+	[TEGRA_POWERGATE_C1NC] = "c1nc",
+	[TEGRA_POWERGATE_SOR] = "sor",
+	[TEGRA_POWERGATE_DIS] = "dis",
+	[TEGRA_POWERGATE_DISB] = "disb",
+	[TEGRA_POWERGATE_XUSBA] = "xusba",
+	[TEGRA_POWERGATE_XUSBB] = "xusbb",
+	[TEGRA_POWERGATE_XUSBC] = "xusbc",
+	[TEGRA_POWERGATE_VIC] = "vic",
+	[TEGRA_POWERGATE_IRAM] = "iram",
+};
+
+static const u8 tegra124_cpu_powergates[] = {
+	TEGRA_POWERGATE_CPU0,
+	TEGRA_POWERGATE_CPU1,
+	TEGRA_POWERGATE_CPU2,
+	TEGRA_POWERGATE_CPU3,
+};
+
+static const struct tegra_pmc_soc tegra124_pmc_soc = {
+	.num_powergates = ARRAY_SIZE(tegra124_powergates),
+	.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[] = {
+	{ .compatible = "nvidia,tegra124-pmc", .data = &tegra124_pmc_soc },
+	{ .compatible = "nvidia,tegra114-pmc", .data = &tegra114_pmc_soc },
+	{ .compatible = "nvidia,tegra30-pmc", .data = &tegra30_pmc_soc },
+	{ .compatible = "nvidia,tegra20-pmc", .data = &tegra20_pmc_soc },
+	{ }
+};
+
+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 *i2c_np, *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;
+	}
+
+	i2c_np = of_parse_phandle(tt_np, "nvidia,i2c-bus", 0);
+	if (!i2c_np) {
+		dev_err(dev, "I2C bus reference missing, disabling emergency thermal reset\n");
+		goto put_tt;
+	}
+
+	if (of_property_read_u32(i2c_np, "nvidia,controller-id", &i2c_ctrl_id)) {
+		dev_err(dev, "I2C bus controller id missing, disabling emergency thermal reset\n");
+		goto put_i2c;
+	}
+
+	of_node_put(i2c_np);
+
+	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", &reg_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", &reg_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_i2c:
+	of_node_put(i2c_np);
+
+put_tt:
+	of_node_put(tt_np);
+}
+
 static int tegra_pmc_parse_dt(struct tegra_pmc *pmc, struct device_node *np)
 {
 	u32 value, values[2];
@@ -730,6 +975,8 @@ 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)
@@ -757,138 +1004,6 @@ static int tegra_pmc_resume(struct device *dev)
 
 static SIMPLE_DEV_PM_OPS(tegra_pmc_pm_ops, tegra_pmc_suspend, tegra_pmc_resume);
 
-static const char * const tegra20_powergates[] = {
-	[TEGRA_POWERGATE_CPU] = "cpu",
-	[TEGRA_POWERGATE_3D] = "3d",
-	[TEGRA_POWERGATE_VENC] = "venc",
-	[TEGRA_POWERGATE_VDEC] = "vdec",
-	[TEGRA_POWERGATE_PCIE] = "pcie",
-	[TEGRA_POWERGATE_L2] = "l2",
-	[TEGRA_POWERGATE_MPE] = "mpe",
-};
-
-static const struct tegra_pmc_soc tegra20_pmc_soc = {
-	.num_powergates = ARRAY_SIZE(tegra20_powergates),
-	.powergates = tegra20_powergates,
-	.num_cpu_powergates = 0,
-	.cpu_powergates = NULL,
-};
-
-static const char * const tegra30_powergates[] = {
-	[TEGRA_POWERGATE_CPU] = "cpu0",
-	[TEGRA_POWERGATE_3D] = "3d0",
-	[TEGRA_POWERGATE_VENC] = "venc",
-	[TEGRA_POWERGATE_VDEC] = "vdec",
-	[TEGRA_POWERGATE_PCIE] = "pcie",
-	[TEGRA_POWERGATE_L2] = "l2",
-	[TEGRA_POWERGATE_MPE] = "mpe",
-	[TEGRA_POWERGATE_HEG] = "heg",
-	[TEGRA_POWERGATE_SATA] = "sata",
-	[TEGRA_POWERGATE_CPU1] = "cpu1",
-	[TEGRA_POWERGATE_CPU2] = "cpu2",
-	[TEGRA_POWERGATE_CPU3] = "cpu3",
-	[TEGRA_POWERGATE_CELP] = "celp",
-	[TEGRA_POWERGATE_3D1] = "3d1",
-};
-
-static const u8 tegra30_cpu_powergates[] = {
-	TEGRA_POWERGATE_CPU,
-	TEGRA_POWERGATE_CPU1,
-	TEGRA_POWERGATE_CPU2,
-	TEGRA_POWERGATE_CPU3,
-};
-
-static const struct tegra_pmc_soc tegra30_pmc_soc = {
-	.num_powergates = ARRAY_SIZE(tegra30_powergates),
-	.powergates = tegra30_powergates,
-	.num_cpu_powergates = ARRAY_SIZE(tegra30_cpu_powergates),
-	.cpu_powergates = tegra30_cpu_powergates,
-};
-
-static const char * const tegra114_powergates[] = {
-	[TEGRA_POWERGATE_CPU] = "crail",
-	[TEGRA_POWERGATE_3D] = "3d",
-	[TEGRA_POWERGATE_VENC] = "venc",
-	[TEGRA_POWERGATE_VDEC] = "vdec",
-	[TEGRA_POWERGATE_MPE] = "mpe",
-	[TEGRA_POWERGATE_HEG] = "heg",
-	[TEGRA_POWERGATE_CPU1] = "cpu1",
-	[TEGRA_POWERGATE_CPU2] = "cpu2",
-	[TEGRA_POWERGATE_CPU3] = "cpu3",
-	[TEGRA_POWERGATE_CELP] = "celp",
-	[TEGRA_POWERGATE_CPU0] = "cpu0",
-	[TEGRA_POWERGATE_C0NC] = "c0nc",
-	[TEGRA_POWERGATE_C1NC] = "c1nc",
-	[TEGRA_POWERGATE_DIS] = "dis",
-	[TEGRA_POWERGATE_DISB] = "disb",
-	[TEGRA_POWERGATE_XUSBA] = "xusba",
-	[TEGRA_POWERGATE_XUSBB] = "xusbb",
-	[TEGRA_POWERGATE_XUSBC] = "xusbc",
-};
-
-static const u8 tegra114_cpu_powergates[] = {
-	TEGRA_POWERGATE_CPU0,
-	TEGRA_POWERGATE_CPU1,
-	TEGRA_POWERGATE_CPU2,
-	TEGRA_POWERGATE_CPU3,
-};
-
-static const struct tegra_pmc_soc tegra114_pmc_soc = {
-	.num_powergates = ARRAY_SIZE(tegra114_powergates),
-	.powergates = tegra114_powergates,
-	.num_cpu_powergates = ARRAY_SIZE(tegra114_cpu_powergates),
-	.cpu_powergates = tegra114_cpu_powergates,
-};
-
-static const char * const tegra124_powergates[] = {
-	[TEGRA_POWERGATE_CPU] = "crail",
-	[TEGRA_POWERGATE_3D] = "3d",
-	[TEGRA_POWERGATE_VENC] = "venc",
-	[TEGRA_POWERGATE_PCIE] = "pcie",
-	[TEGRA_POWERGATE_VDEC] = "vdec",
-	[TEGRA_POWERGATE_L2] = "l2",
-	[TEGRA_POWERGATE_MPE] = "mpe",
-	[TEGRA_POWERGATE_HEG] = "heg",
-	[TEGRA_POWERGATE_SATA] = "sata",
-	[TEGRA_POWERGATE_CPU1] = "cpu1",
-	[TEGRA_POWERGATE_CPU2] = "cpu2",
-	[TEGRA_POWERGATE_CPU3] = "cpu3",
-	[TEGRA_POWERGATE_CELP] = "celp",
-	[TEGRA_POWERGATE_CPU0] = "cpu0",
-	[TEGRA_POWERGATE_C0NC] = "c0nc",
-	[TEGRA_POWERGATE_C1NC] = "c1nc",
-	[TEGRA_POWERGATE_SOR] = "sor",
-	[TEGRA_POWERGATE_DIS] = "dis",
-	[TEGRA_POWERGATE_DISB] = "disb",
-	[TEGRA_POWERGATE_XUSBA] = "xusba",
-	[TEGRA_POWERGATE_XUSBB] = "xusbb",
-	[TEGRA_POWERGATE_XUSBC] = "xusbc",
-	[TEGRA_POWERGATE_VIC] = "vic",
-	[TEGRA_POWERGATE_IRAM] = "iram",
-};
-
-static const u8 tegra124_cpu_powergates[] = {
-	TEGRA_POWERGATE_CPU0,
-	TEGRA_POWERGATE_CPU1,
-	TEGRA_POWERGATE_CPU2,
-	TEGRA_POWERGATE_CPU3,
-};
-
-static const struct tegra_pmc_soc tegra124_pmc_soc = {
-	.num_powergates = ARRAY_SIZE(tegra124_powergates),
-	.powergates = tegra124_powergates,
-	.num_cpu_powergates = ARRAY_SIZE(tegra124_cpu_powergates),
-	.cpu_powergates = tegra124_cpu_powergates,
-};
-
-static const struct of_device_id tegra_pmc_match[] = {
-	{ .compatible = "nvidia,tegra124-pmc", .data = &tegra124_pmc_soc },
-	{ .compatible = "nvidia,tegra114-pmc", .data = &tegra114_pmc_soc },
-	{ .compatible = "nvidia,tegra30-pmc", .data = &tegra30_pmc_soc },
-	{ .compatible = "nvidia,tegra20-pmc", .data = &tegra20_pmc_soc },
-	{ }
-};
-
 static struct platform_driver tegra_pmc_driver = {
 	.driver = {
 		.name = "tegra-pmc",
-- 
2.1.3

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