Add support for R-Car Gen3 thermal sensors. Polling only for now,
interrupts will be added incrementally. Same goes for reading fuses.
This is documented already, but no hardware available for now.
Signed-off-by: Hien Dang <hien.dang.eb@xxxxxxxxxxx>
Signed-off-by: Thao Nguyen <thao.nguyen.yb@xxxxxxxxxxxxxxx>
Signed-off-by: Khiem Nguyen <khiem.nguyen.xt@xxxxxxxxxxx>
Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
---
Changes since v3:
* call 'init' callback a tad earlier, avoids need for locking
* converted spinlock to mutex and simplified locking (only done against
concurrent access in rcar_gen3_thermal_get_temp() now)
* use usleep_range instead of udelay
* use s64 instead of long (int didn't work)
* fixed an error path
* simplified rcar_gen3_thermal_update_temp() and its use
Thanks a lot to Eduardo and Geert for the prompt reviews!
drivers/thermal/Kconfig | 9 +
drivers/thermal/Makefile | 1 +
drivers/thermal/rcar_gen3_thermal.c | 324 ++++++++++++++++++++++++++++++++++++
3 files changed, 334 insertions(+)
create mode 100644 drivers/thermal/rcar_gen3_thermal.c
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index c2c056cc7ea52e..3912d24a07b10f 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -245,6 +245,15 @@ config RCAR_THERMAL
Enable this to plug the R-Car thermal sensor driver into the Linux
thermal framework.
+config RCAR_GEN3_THERMAL
+ tristate "Renesas R-Car Gen3 thermal driver"
+ depends on ARCH_RENESAS || COMPILE_TEST
+ depends on HAS_IOMEM
+ depends on OF
+ help
+ Enable this to plug the R-Car Gen3 thermal sensor driver into the Linux
+ thermal framework.
+
config KIRKWOOD_THERMAL
tristate "Temperature sensor on Marvell Kirkwood SoCs"
depends on MACH_KIRKWOOD || COMPILE_TEST
diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
index c92eb22a41ff89..1216fb31ed4036 100644
--- a/drivers/thermal/Makefile
+++ b/drivers/thermal/Makefile
@@ -30,6 +30,7 @@ obj-$(CONFIG_QCOM_SPMI_TEMP_ALARM) += qcom-spmi-temp-alarm.o
obj-$(CONFIG_SPEAR_THERMAL) += spear_thermal.o
obj-$(CONFIG_ROCKCHIP_THERMAL) += rockchip_thermal.o
obj-$(CONFIG_RCAR_THERMAL) += rcar_thermal.o
+obj-$(CONFIG_RCAR_GEN3_THERMAL) += rcar_gen3_thermal.o
obj-$(CONFIG_KIRKWOOD_THERMAL) += kirkwood_thermal.o
obj-y += samsung/
obj-$(CONFIG_DOVE_THERMAL) += dove_thermal.o
diff --git a/drivers/thermal/rcar_gen3_thermal.c b/drivers/thermal/rcar_gen3_thermal.c
new file mode 100644
index 00000000000000..ef30d84b0f56a2
--- /dev/null
+++ b/drivers/thermal/rcar_gen3_thermal.c
@@ -0,0 +1,324 @@
+/*
+ * R-Car Gen3 THS thermal sensor driver
+ * Based on rcar_thermal.c and work from Hien Dang and Khiem Nguyen.
+ *
+ * Copyright (C) 2016 Renesas Electronics Corporation.
+ * Copyright (C) 2016 Sang Engineering
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ */
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/thermal.h>
+
+/* Register offsets */
+#define REG_GEN3_IRQSTR 0x04
+#define REG_GEN3_IRQMSK 0x08
+#define REG_GEN3_IRQCTL 0x0C
+#define REG_GEN3_IRQEN 0x10
+#define REG_GEN3_IRQTEMP1 0x14
+#define REG_GEN3_IRQTEMP2 0x18
+#define REG_GEN3_IRQTEMP3 0x1C
+#define REG_GEN3_CTSR 0x20
+#define REG_GEN3_THCTR 0x20
+#define REG_GEN3_TEMP 0x28
+#define REG_GEN3_THCODE1 0x50
+#define REG_GEN3_THCODE2 0x54
+#define REG_GEN3_THCODE3 0x58
+
+/* CTSR bits */
+#define CTSR_PONM BIT(8)
+#define CTSR_AOUT BIT(7)
+#define CTSR_THBGR BIT(5)
+#define CTSR_VMEN BIT(4)
+#define CTSR_VMST BIT(1)
+#define CTSR_THSST BIT(0)
+
+/* THCTR bits */
+#define THCTR_PONM BIT(6)
+#define THCTR_THSST BIT(0)
+
+#define CTEMP_MASK 0xFFF
+
+#define MCELSIUS(temp) ((temp) * 1000)
+#define GEN3_FUSE_MASK 0xFFF
+
+#define TSC_MAX_NUM 3
+
+/* Structure for thermal temperature calculation */
+struct equation_coefs {
+ s64 a1;
+ s64 b1;
+ s64 a2;
+ s64 b2;
+};
+
+struct rcar_gen3_thermal_tsc {
+ void __iomem *base;
+ struct thermal_zone_device *zone;
+ struct equation_coefs coef;
+ struct mutex lock;
+ u32 ctemp;
+};
+
+struct rcar_gen3_thermal_priv {
+ struct rcar_gen3_thermal_tsc *tscs[TSC_MAX_NUM];
+};
+
+struct rcar_gen3_thermal_data {
+ void (*thermal_init)(struct rcar_gen3_thermal_tsc *tsc);
+};
+
+/* Temperature calculation */
+#define RCAR3_THERMAL_GRAN 500
+#define CODETSD(x) ((x) * 1000)
+#define TJ_1 96000L
+#define TJ_3 (-41000L)
+
+static inline u32 rcar_gen3_thermal_read(struct rcar_gen3_thermal_tsc *tsc, u32 reg)
+{
+ return ioread32(tsc->base + reg);
+}
+
+static inline void rcar_gen3_thermal_write(struct rcar_gen3_thermal_tsc *tsc,
+ u32 reg, u32 data)
+{
+ iowrite32(data, tsc->base + reg);
+}
+
+static int _round_temp(int temp)
+{
+ int result, round_offs;
+
+ round_offs = temp >= 0 ? RCAR3_THERMAL_GRAN / 2 : -RCAR3_THERMAL_GRAN / 2;
+ result = (temp + round_offs) / RCAR3_THERMAL_GRAN;
+ return result * RCAR3_THERMAL_GRAN;
+}
+
+static void _linear_coefficient_calculation(struct rcar_gen3_thermal_tsc *tsc,
+ int *ptat, int *thcode)
+{
+ int tj_2;
+ s64 a1, b1;
+ s64 a2, b2;
+ s64 a1_num, a1_den;
+ s64 a2_num, a2_den;
+
+ tj_2 = (CODETSD((ptat[1] - ptat[2]) * 137)
+ / (ptat[0] - ptat[2])) - CODETSD(41);
+
+ /* calculate coefficients for linear equation */
+ a1_num = CODETSD(thcode[1] - thcode[2]);
+ a1_den = tj_2 - TJ_3;
+ a1 = (10000 * a1_num) / a1_den;
+ b1 = (10000 * thcode[2]) - ((a1 * TJ_3) / 1000);
+
+ a2_num = CODETSD(thcode[1] - thcode[0]);
+ a2_den = tj_2 - TJ_1;
+ a2 = (10000 * a2_num) / a2_den;
+ b2 = (10000 * thcode[0]) - ((a2 * TJ_1) / 1000);
+
+ tsc->coef.a1 = DIV_ROUND_CLOSEST(a1, 10);
+ tsc->coef.b1 = DIV_ROUND_CLOSEST(b1, 10);
+ tsc->coef.a2 = DIV_ROUND_CLOSEST(a2, 10);
+ tsc->coef.b2 = DIV_ROUND_CLOSEST(b2, 10);
+}
+
+static int _linear_temp_converter(struct equation_coefs *coef,
+ int temp_code)
+{
+ int temp, temp1, temp2;
+
+ temp1 = MCELSIUS((CODETSD(temp_code) - coef->b1)) / coef->a1;
+ temp2 = MCELSIUS((CODETSD(temp_code) - coef->b2)) / coef->a2;
+ temp = (temp1 + temp2) / 2;
+
+ return _round_temp(temp);
+}
+
+static void rcar_gen3_thermal_update_temp(struct rcar_gen3_thermal_tsc *tsc)
+{
+ tsc->ctemp = rcar_gen3_thermal_read(tsc, REG_GEN3_TEMP) & CTEMP_MASK;
+}
+
+static int rcar_gen3_thermal_get_temp(void *devdata, int *temp)
+{
+ struct rcar_gen3_thermal_tsc *tsc = devdata;
+ int ctemp;
+
+ mutex_lock(&tsc->lock);
+
+ rcar_gen3_thermal_update_temp(tsc);
+ ctemp = _linear_temp_converter(&tsc->coef, tsc->ctemp);
+
+ mutex_unlock(&tsc->lock);
+
+ if ((ctemp < MCELSIUS(-40)) || (ctemp > MCELSIUS(125)))
+ return -EIO;
+
+ *temp = ctemp;
+
+ return 0;
+}
+
+static struct thermal_zone_of_device_ops rcar_gen3_tz_of_ops = {
+ .get_temp = rcar_gen3_thermal_get_temp,
+};
+
+static void r8a7795_thermal_init(struct rcar_gen3_thermal_tsc *tsc)
+{
+ rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR, CTSR_THBGR);
+ rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR, 0x0);
+
+ usleep_range(1000, 2000);
+
+ rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR, CTSR_PONM);
+ rcar_gen3_thermal_write(tsc, REG_GEN3_IRQCTL, 0x3F);
+ rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR,
+ CTSR_PONM | CTSR_AOUT | CTSR_THBGR | CTSR_VMEN);
+
+ usleep_range(100, 200);
+
+ rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR,
+ CTSR_PONM | CTSR_AOUT | CTSR_THBGR | CTSR_VMEN |
+ CTSR_VMST | CTSR_THSST);
+}
+
+static void r8a7796_thermal_init(struct rcar_gen3_thermal_tsc *tsc)
+{
+ u32 reg_val;
+
+ reg_val = rcar_gen3_thermal_read(tsc, REG_GEN3_THCTR);
+ reg_val &= ~THCTR_PONM;
+ rcar_gen3_thermal_write(tsc, REG_GEN3_THCTR, reg_val);
+
+ usleep_range(1000, 2000);
+
+ rcar_gen3_thermal_write(tsc, REG_GEN3_IRQCTL, 0x3F);
+ reg_val = rcar_gen3_thermal_read(tsc, REG_GEN3_THCTR);
+ reg_val |= THCTR_THSST;
+ rcar_gen3_thermal_write(tsc, REG_GEN3_THCTR, reg_val);
+}
+
+static const struct rcar_gen3_thermal_data r8a7795_data = {
+ .thermal_init = r8a7795_thermal_init,
+};
+
+static const struct rcar_gen3_thermal_data r8a7796_data = {
+ .thermal_init = r8a7796_thermal_init,
+};
+
+static const struct of_device_id rcar_gen3_thermal_dt_ids[] = {
+ { .compatible = "renesas,r8a7795-thermal", .data = &r8a7795_data},
+ { .compatible = "renesas,r8a7796-thermal", .data = &r8a7796_data},
+ {},
+};
+MODULE_DEVICE_TABLE(of, rcar_gen3_thermal_dt_ids);
+
+static int rcar_gen3_thermal_remove(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+
+ pm_runtime_put(dev);
+ pm_runtime_disable(dev);
+
+ return 0;
+}
+
+static int rcar_gen3_thermal_probe(struct platform_device *pdev)
+{
+ struct rcar_gen3_thermal_priv *priv;
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ struct thermal_zone_device *zone;
+ int ret, i;
+ const struct rcar_gen3_thermal_data *match_data = of_device_get_match_data(dev);
+
+ /* default values if FUSEs are missing */
+ int ptat[3] = { 2351, 1509, 435 };
+ int thcode[TSC_MAX_NUM][3] = {
+ { 3248, 2800, 2221 },
+ { 3245, 2795, 2216 },
+ { 3250, 2805, 2237 },
+ };
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, priv);
+
+ pm_runtime_enable(dev);
+ pm_runtime_get_sync(dev);
+
+ for (i = 0; i < TSC_MAX_NUM; i++) {
+ struct rcar_gen3_thermal_tsc *tsc;
+
+ tsc = devm_kzalloc(dev, sizeof(*tsc), GFP_KERNEL);
+ if (!tsc) {
+ ret = -ENOMEM;
+ goto error_unregister;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, i);
+ if (!res)
+ break;
+
+ tsc->base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(tsc->base)) {
+ ret = PTR_ERR(tsc->base);
+ goto error_unregister;
+ }
+
+ priv->tscs[i] = tsc;
+ mutex_init(&tsc->lock);
+
+ match_data->thermal_init(tsc);
+ _linear_coefficient_calculation(tsc, ptat, thcode[i]);
+
+ zone = devm_thermal_zone_of_sensor_register(dev, i, tsc,
+ &rcar_gen3_tz_of_ops);
+ if (IS_ERR(zone)) {
+ dev_err(dev, "Can't register thermal zone\n");
+ ret = PTR_ERR(zone);
+ goto error_unregister;
+ }
+ tsc->zone = zone;
+ }
+
+ return 0;
+
+error_unregister:
+ rcar_gen3_thermal_remove(pdev);
+
+ return ret;
+}
+
+static struct platform_driver rcar_gen3_thermal_driver = {
+ .driver = {
+ .name = "rcar_gen3_thermal",
+ .of_match_table = rcar_gen3_thermal_dt_ids,
+ },
+ .probe = rcar_gen3_thermal_probe,
+ .remove = rcar_gen3_thermal_remove,
+};
+module_platform_driver(rcar_gen3_thermal_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("R-Car Gen3 THS thermal sensor driver");
+MODULE_AUTHOR("Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>");
--
2.10.2
