Signed-off-by: Hien Dang <hien.dang...@renesas.com>
Signed-off-by: Thao Nguyen <thao.nguyen...@rvc.renesas.com>
Signed-off-by: Khiem Nguyen <khiem.nguyen...@renesas.com>
---
v2:
* Set static function for _linear_temp_converter().
* Update the compatible string following new format.
* Add newline to improve readability.
* Change thermal_init callbacks to void functions.
* Improve the processing to register thermal_zones.
drivers/thermal/Kconfig | 9 +
drivers/thermal/Makefile | 1 +
drivers/thermal/rcar_gen3_thermal.c | 539 ++++++++++++++++++++++++++++++++++++
3 files changed, 549 insertions(+)
create mode 100644 drivers/thermal/rcar_gen3_thermal.c
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index 900d505..8500a0a 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -233,6 +233,15 @@ 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 d091134..b7e7082 100644
--- a/drivers/thermal/Makefile
+++ b/drivers/thermal/Makefile
@@ -31,6 +31,7 @@ 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 0000000..cdaaa75
--- /dev/null
+++ b/drivers/thermal/rcar_gen3_thermal.c
@@ -0,0 +1,539 @@
+/*
+ * R-Car Gen3 THS thermal sensor driver
+ * Based on drivers/thermal/rcar_thermal.c
+ *
+ * Copyright (C) 2016 Renesas Electronics Corporation.
+ *
+ * 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/irq.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/spinlock.h>
+#include <linux/thermal.h>
+
+/* Register offset */
+#define REG_GEN3_CTSR 0x20
+#define REG_GEN3_THCTR 0x20
+#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_TEMP 0x28
+#define REG_GEN3_THCODE1 0x50
+#define REG_GEN3_THCODE2 0x54
+#define REG_GEN3_THCODE3 0x58
+
+#define PTAT_BASE 0xE6198000
+#define REG_GEN3_PTAT1 0x5C
+#define REG_GEN3_PTAT2 0x60
+#define REG_GEN3_PTAT3 0x64
+#define PTAT_SIZE REG_GEN3_PTAT3
+
+/* CTSR bit */
+#define PONM (0x1 << 8)
+#define AOUT (0x1 << 7)
+#define THBGR (0x1 << 5)
+#define VMEN (0x1 << 4)
+#define VMST (0x1 << 1)
+#define THSST (0x1 << 0)
+
+/* THCTR bit */
+#define CTCTL (0x1 << 24)
+#define THCNTSEN(x) (x << 16)
+
+#define BIT_LEN_12 0x1
+
+#define CTEMP_MASK 0xFFF
+
+#define MCELSIUS(temp) ((temp) * 1000)
+#define TEMP_IRQ_SHIFT(tsc_id) (0x1 << tsc_id)
+#define TEMPD_IRQ_SHIFT(tsc_id) (0x1 << (tsc_id + 3))
+#define GEN3_FUSE_MASK 0xFFF
+
+/* Structure for thermal temperature calculation */
+struct equation_coefs {
+ long a1;
+ long b1;
+ long a2;
+ long b2;
+};
+
+struct fuse_factors {
+ int thcode_1;
+ int thcode_2;
+ int thcode_3;
+ int ptat_1;
+ int ptat_2;
+ int ptat_3;
+};
+
+struct rcar_gen3_thermal_priv {
+ void __iomem *base;
+ struct device *dev;
+ struct thermal_zone_device *zone;
+ struct delayed_work work;
+ struct fuse_factors factor;
+ struct equation_coefs coef;
+ spinlock_t lock;
+ int id;
+ int irq;
+ u32 ctemp;
+ const struct rcar_gen3_thermal_data *data;
+};
+
+struct rcar_gen3_thermal_data {
+ void (*thermal_init)(struct rcar_gen3_thermal_priv *priv);
+};
+
+#define rcar_priv_to_dev(priv) ((priv)->dev)
+#define rcar_has_irq_support(priv) ((priv)->irq)
+
+/* Temperature calculation */
+#define CODETSD(x) ((x) * 1000)
+#define TJ_1 96000L
+#define TJ_3 (-41000L)
+#define PW2(x) ((x)*(x))
+
+static u32 thermal_reg_read(struct rcar_gen3_thermal_priv *priv, u32 reg)
+{
+ return ioread32(priv->base + reg);
+}
+
+static void thermal_reg_write(struct rcar_gen3_thermal_priv *priv,
+ u32 reg, u32 data)
+{
+ iowrite32(data, priv->base + reg);
+}
+
+static int _round_temp(int temp)
+{
+ int tmp1, tmp2;
+ int result = 0;
+
+ tmp1 = abs(temp) % 1000;
+ tmp2 = abs(temp) / 1000;
+
+ if (tmp1 < 250)
+ result = CODETSD(tmp2);
+ else if (tmp1 < 750 && tmp1 >= 250)
+ result = CODETSD(tmp2) + 500;
+ else
+ result = CODETSD(tmp2) + 1000;
+
+ return ((temp < 0) ? (result * (-1)) : result);
+}
+
+static int _read_fuse_factor(struct rcar_gen3_thermal_priv *priv)
+{
+ /*
+ * FIXME: The value should be read from some FUSE registers.
+ * For available SoC, these registers have not been supported yet.
+ * The pre-defined value will be applied for now.
+ */
+ priv->factor.ptat_1 = 2351;
+ priv->factor.ptat_2 = 1509;
+ priv->factor.ptat_3 = 435;
+ switch (priv->id) {
+ case 0:
+ priv->factor.thcode_1 = 3248;
+ priv->factor.thcode_2 = 2800;
+ priv->factor.thcode_3 = 2221;
+ break;
+ case 1:
+ priv->factor.thcode_1 = 3245;
+ priv->factor.thcode_2 = 2795;
+ priv->factor.thcode_3 = 2216;
+ break;
+ case 2:
+ priv->factor.thcode_1 = 3250;
+ priv->factor.thcode_2 = 2805;
+ priv->factor.thcode_3 = 2237;
+ break;
+ }
+
+ return 0;
+}
+
+static void _linear_coefficient_calculation(struct rcar_gen3_thermal_priv
*priv)
+{
+ int tj_2 = 0;
+ long a1, b1;
+ long a2, b2;
+ long a1_num, a1_den;
+ long a2_num, a2_den;
+
+ tj_2 = (CODETSD((priv->factor.ptat_2 - priv->factor.ptat_3) * 137)
+ / (priv->factor.ptat_1 - priv->factor.ptat_3)) - CODETSD(41);
+
+ /*
+ * The following code is to calculate coefficients for linear equation.
+ */
+ /* Coefficient a1 and b1 */
+ a1_num = CODETSD(priv->factor.thcode_2 - priv->factor.thcode_3);
+ a1_den = tj_2 - TJ_3;
+ a1 = (10000 * a1_num) / a1_den;
+ b1 = (10000 * priv->factor.thcode_3) - ((a1 * TJ_3) / 1000);
+
+ /* Coefficient a2 and b2 */
+ a2_num = CODETSD(priv->factor.thcode_2 - priv->factor.thcode_1);
+ a2_den = tj_2 - TJ_1;
+ a2 = (10000 * a2_num) / a2_den;
+ b2 = (10000 * priv->factor.thcode_1) - ((a2 * TJ_1) / 1000);
+
+ priv->coef.a1 = DIV_ROUND_CLOSEST(a1, 10);
+ priv->coef.b1 = DIV_ROUND_CLOSEST(b1, 10);
+ priv->coef.a2 = DIV_ROUND_CLOSEST(a2, 10);
+ priv->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);
+}
+
+/*
+ * Zone device functions
+ */
+static int rcar_gen3_thermal_update_temp(struct rcar_gen3_thermal_priv *priv)
+{
+ u32 ctemp;
+ int i;
+ unsigned long flags;
+ u32 reg = REG_GEN3_IRQTEMP1 + (priv->id * 4);
+
+ spin_lock_irqsave(&priv->lock, flags);
+
+ for (i = 0; i < 256; i++) {
+ ctemp = thermal_reg_read(priv, REG_GEN3_TEMP) & CTEMP_MASK;
+
+ if (rcar_has_irq_support(priv)) {
+ thermal_reg_write(priv, reg, ctemp);
+
+ if (thermal_reg_read(priv, REG_GEN3_IRQSTR) != 0)
+ break;
+ } else
+ break;
+
+ udelay(150);
+ }
+
+ priv->ctemp = ctemp;
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ return 0;
+}
+
+static int rcar_gen3_thermal_get_temp(void *devdata, int *temp)
+{
+ struct rcar_gen3_thermal_priv *priv = devdata;
+ int ctemp;
+ unsigned long flags;
+
+ rcar_gen3_thermal_update_temp(priv);
+
+ spin_lock_irqsave(&priv->lock, flags);
+ ctemp = _linear_temp_converter(priv->coef, priv->ctemp);
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ if ((ctemp < MCELSIUS(-40)) || (ctemp > MCELSIUS(125))) {
+ struct device *dev = rcar_priv_to_dev(priv);
+
+ dev_dbg(dev, "Temperature is not measured correctly!\n");
+ return -EIO;
+ }
+
+ *temp = ctemp;
+
+ return 0;
+}
+
+static void r8a7795_thermal_init(struct rcar_gen3_thermal_priv *priv)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&priv->lock, flags);
+
+ thermal_reg_write(priv, REG_GEN3_CTSR, THBGR);
+ thermal_reg_write(priv, REG_GEN3_CTSR, 0x0);
+
+ udelay(1000);
+
+ thermal_reg_write(priv, REG_GEN3_CTSR, PONM);
+ thermal_reg_write(priv, REG_GEN3_IRQCTL, 0x3F);
+ thermal_reg_write(priv, REG_GEN3_IRQEN, TEMP_IRQ_SHIFT(priv->id) |
+ TEMPD_IRQ_SHIFT(priv->id));
+ thermal_reg_write(priv, REG_GEN3_CTSR,
+ PONM | AOUT | THBGR | VMEN);
+
+ udelay(100);
+
+ thermal_reg_write(priv, REG_GEN3_CTSR,
+ PONM | AOUT | THBGR | VMEN | VMST | THSST);
+
+ spin_unlock_irqrestore(&priv->lock, flags);
+}
+
+static void r8a7796_thermal_init(struct rcar_gen3_thermal_priv *priv)
+{
+ unsigned long flags;
+ unsigned long reg_val;
+
+ spin_lock_irqsave(&priv->lock, flags);
+
+ thermal_reg_write(priv, REG_GEN3_THCTR, 0x0);
+
+ udelay(1000);
+
+ thermal_reg_write(priv, REG_GEN3_IRQCTL, 0x3F);
+ thermal_reg_write(priv, REG_GEN3_IRQEN, TEMP_IRQ_SHIFT(priv->id) |
+ TEMPD_IRQ_SHIFT(priv->id));
+ thermal_reg_write(priv, REG_GEN3_THCTR,
+ CTCTL | THCNTSEN(BIT_LEN_12));
+ reg_val = thermal_reg_read(priv, REG_GEN3_THCTR);
+ reg_val &= ~CTCTL;
+ reg_val |= THSST;
+ thermal_reg_write(priv, REG_GEN3_THCTR, reg_val);
+
+ spin_unlock_irqrestore(&priv->lock, flags);
+}
+
+/*
+ * Interrupt
+ */
+#define rcar_gen3_thermal_irq_enable(p) _thermal_irq_ctrl(p, 1)
+#define rcar_gen3_thermal_irq_disable(p) _thermal_irq_ctrl(p, 0)
+static void _thermal_irq_ctrl(struct rcar_gen3_thermal_priv *priv, int enable)
+{
+ unsigned long flags;
+
+ if (!rcar_has_irq_support(priv))
+ return;
+
+ spin_lock_irqsave(&priv->lock, flags);
+
+ thermal_reg_write(priv, REG_GEN3_IRQMSK,
+ enable ? (TEMP_IRQ_SHIFT(priv->id) |
+ TEMPD_IRQ_SHIFT(priv->id)) : 0);
+
+ spin_unlock_irqrestore(&priv->lock, flags);
+}
+
+static void rcar_gen3_thermal_work(struct work_struct *work)
+{
+ struct rcar_gen3_thermal_priv *priv;
+
+ priv = container_of(work, struct rcar_gen3_thermal_priv, work.work);
+
+ thermal_zone_device_update(priv->zone);
+
+ rcar_gen3_thermal_irq_enable(priv);
+}
+
+static irqreturn_t rcar_gen3_thermal_irq(int irq, void *data)
+{
+ struct rcar_gen3_thermal_priv *priv = data;
+ unsigned long flags;
+ int status;
+
+ spin_lock_irqsave(&priv->lock, flags);
+
+ status = thermal_reg_read(priv, REG_GEN3_IRQSTR);
+ thermal_reg_write(priv, REG_GEN3_IRQSTR, 0);
+
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ if ((status & TEMP_IRQ_SHIFT(priv->id)) ||
+ (status & TEMPD_IRQ_SHIFT(priv->id))) {
+ rcar_gen3_thermal_irq_disable(priv);
+ schedule_delayed_work(&priv->work,
+ msecs_to_jiffies(300));
+ }
+
+ return IRQ_HANDLED;
+}
+
+static struct thermal_zone_of_device_ops rcar_gen3_tz_of_ops = {
+ .get_temp = rcar_gen3_thermal_get_temp,
+};
+
+/*
+ * Platform functions
+ */
+static int rcar_gen3_thermal_remove(struct platform_device *pdev)
+{
+ struct rcar_gen3_thermal_priv *priv = platform_get_drvdata(pdev);
+ struct device *dev = &pdev->dev;
+
+ rcar_gen3_thermal_irq_disable(priv);
+ thermal_zone_of_sensor_unregister(dev, priv->zone);
+
+ pm_runtime_put(dev);
+ pm_runtime_disable(dev);
+
+ return 0;
+}
+
+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_probe(struct platform_device *pdev)
+{
+ struct rcar_gen3_thermal_priv *priv;
+ struct device *dev = &pdev->dev;
+ struct resource *res, *irq;
+ int ret = -ENODEV;
+ int idle;
+ struct device_node *tz_nd, *tmp_nd;
+ struct thermal_zone_device *zone;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, priv);
+
+ priv->dev = dev;
+
+ pm_runtime_enable(dev);
+ pm_runtime_get_sync(dev);
+
+ priv->data = of_device_get_match_data(dev);
+ if (!priv->data)
+ goto error_unregister;
+
+ priv->irq = 0;
+
+ irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (irq) {
+ priv->irq = 1;
+ for_each_node_with_property(tz_nd, "polling-delay") {
+ tmp_nd = of_parse_phandle(tz_nd,
+ "thermal-sensors", 0);
+ if (tmp_nd && !strcmp(tmp_nd->full_name,
+ dev->of_node->full_name)) {
+ of_property_read_u32(tz_nd, "polling-delay",
+ &idle);
+ if (idle > 0)
+ priv->irq = 0;
+ break;
+ }
+ }
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ goto error_unregister;
+
+ priv->base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(priv->base)) {
+ ret = PTR_ERR(priv->base);
+ goto error_unregister;
+ }
+
+ spin_lock_init(&priv->lock);
+ INIT_DELAYED_WORK(&priv->work, rcar_gen3_thermal_work);
+
+ priv->id = of_alias_get_id(dev->of_node, "tsc");
+ if (priv->id < 0) {
+ dev_err(dev, "Failed to get alias id (%d)\n", priv->id);
+ ret = priv->id;
+ goto error_unregister;
+ }
+
+ zone = devm_thermal_zone_of_sensor_register(dev, 0, priv,
+ &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;
+ }
+ priv->zone = zone;
+
+ priv->data->thermal_init(priv);
+
+ ret = _read_fuse_factor(priv);
+ if (ret)
+ goto error_unregister;
+
+ _linear_coefficient_calculation(priv);
+
+ ret = rcar_gen3_thermal_update_temp(priv);
+
+ if (ret < 0)
+ goto error_unregister;
+
+
+ rcar_gen3_thermal_irq_enable(priv);
+
+ /* Interrupt */
+ if (irq) {
+ ret = devm_request_irq(dev, irq->start,
+ rcar_gen3_thermal_irq, 0,
+ dev_name(dev), priv);
+ if (ret) {
+ dev_err(dev, "IRQ request failed\n ");
+ goto error_unregister;
+ }
+ }
+
+ dev_info(dev, "probed\n");
+
+ 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("Khiem Nguyen <khiem.nguyen...@renesas.com>");
--
1.9.1
