thermal: exynos: Add hardware mode thermal calibration support

This patch adds support for h/w mode calibration in the TMU controller.
Soc's like 5440 support this features. The h/w bits needed for calibration
setting are same as that of enum calibration_type.

Acked-by: Jonghwa Lee <jonghwa3.lee@samsung.com>
Acked-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Amit Daniel Kachhap <amit.daniel@samsung.com>
Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com>

drivers/thermal/samsung/exynos_tmu.c

@@ -73,6 +73,9 @@ static int temp_to_code(struct exynos_tmu_data *data, u8 temp)
 	struct exynos_tmu_platform_data *pdata = data->pdata;
 	int temp_code;
 
+	if (pdata->cal_mode == HW_MODE)
+		return temp;
+
 	if (data->soc == SOC_ARCH_EXYNOS4210)
 		/* temp should range between 25 and 125 */
 		if (temp < 25 || temp > 125) {
@@ -107,6 +110,9 @@ static int code_to_temp(struct exynos_tmu_data *data, u8 temp_code)
 	struct exynos_tmu_platform_data *pdata = data->pdata;
 	int temp;
 
+	if (pdata->cal_mode == HW_MODE)
+		return temp_code;
+
 	if (data->soc == SOC_ARCH_EXYNOS4210)
 		/* temp_code should range between 75 and 175 */
 		if (temp_code < 75 || temp_code > 175) {
@@ -155,6 +161,9 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
 	if (TMU_SUPPORTS(pdata, TRIM_RELOAD))
 		__raw_writel(1, data->base + reg->triminfo_ctrl);
 
+	if (pdata->cal_mode == HW_MODE)
+		goto skip_calib_data;
+
 	/* Save trimming info in order to perform calibration */
 	if (data->soc == SOC_ARCH_EXYNOS5440) {
 		/*
@@ -190,6 +199,7 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
 			(pdata->efuse_value >> reg->triminfo_85_shift) &
 			EXYNOS_TMU_TEMP_MASK;
 
+skip_calib_data:
 	if (pdata->max_trigger_level > MAX_THRESHOLD_LEVS) {
 		dev_err(&pdev->dev, "Invalid max trigger level\n");
 		goto out;
@@ -297,7 +307,7 @@ static void exynos_tmu_control(struct platform_device *pdev, bool on)
 	struct exynos_tmu_data *data = platform_get_drvdata(pdev);
 	struct exynos_tmu_platform_data *pdata = data->pdata;
 	const struct exynos_tmu_registers *reg = pdata->registers;
-	unsigned int con, interrupt_en;
+	unsigned int con, interrupt_en, cal_val;
 
 	mutex_lock(&data->lock);
 	clk_enable(data->clk);
@@ -320,6 +330,27 @@ static void exynos_tmu_control(struct platform_device *pdev, bool on)
 		con |= (pdata->noise_cancel_mode << reg->therm_trip_mode_shift);
 	}
 
+	if (pdata->cal_mode == HW_MODE) {
+		con &= ~(reg->calib_mode_mask << reg->calib_mode_shift);
+		cal_val = 0;
+		switch (pdata->cal_type) {
+		case TYPE_TWO_POINT_TRIMMING:
+			cal_val = 3;
+			break;
+		case TYPE_ONE_POINT_TRIMMING_85:
+			cal_val = 2;
+			break;
+		case TYPE_ONE_POINT_TRIMMING_25:
+			cal_val = 1;
+			break;
+		case TYPE_NONE:
+			break;
+		default:
+			dev_err(&pdev->dev, "Invalid calibration type, using none\n");
+		}
+		con |= cal_val << reg->calib_mode_shift;
+	}
+
 	if (on) {
 		con |= (1 << reg->core_en_shift);
 		interrupt_en =

drivers/thermal/samsung/exynos_tmu.h

@@ -28,6 +28,8 @@
 
 enum calibration_type {
 	TYPE_ONE_POINT_TRIMMING,
+	TYPE_ONE_POINT_TRIMMING_25,
+	TYPE_ONE_POINT_TRIMMING_85,
 	TYPE_TWO_POINT_TRIMMING,
 	TYPE_NONE,
 };
@@ -90,6 +92,10 @@ enum soc_type {
  * @buf_slope_sel_shift: shift bits of amplifier gain value in tmu_ctrl
 	register.
  * @buf_slope_sel_mask: mask bits of amplifier gain value in tmu_ctrl register.
+ * @calib_mode_shift: shift bits of calibration mode value in tmu_ctrl
+	register.
+ * @calib_mode_mask: mask bits of calibration mode value in tmu_ctrl
+	register.
  * @therm_trip_tq_en_shift: shift bits of thermal trip enable by TQ pin in
 	tmu_ctrl register.
  * @core_en_shift: shift bits of TMU core enable bit in tmu_ctrl register.
@@ -151,6 +157,8 @@ struct exynos_tmu_registers {
 	u32	therm_trip_en_shift;
 	u32	buf_slope_sel_shift;
 	u32	buf_slope_sel_mask;
+	u32	calib_mode_shift;
+	u32	calib_mode_mask;
 	u32	therm_trip_tq_en_shift;
 	u32	core_en_shift;
 

drivers/thermal/samsung/exynos_tmu_data.c

@@ -189,6 +189,8 @@ static const struct exynos_tmu_registers exynos5440_tmu_registers = {
 	.therm_trip_en_shift = EXYNOS_TMU_THERM_TRIP_EN_SHIFT,
 	.buf_slope_sel_shift = EXYNOS_TMU_BUF_SLOPE_SEL_SHIFT,
 	.buf_slope_sel_mask = EXYNOS_TMU_BUF_SLOPE_SEL_MASK,
+	.calib_mode_shift = EXYNOS_TMU_CALIB_MODE_SHIFT,
+	.calib_mode_mask = EXYNOS_TMU_CALIB_MODE_MASK,
 	.core_en_shift = EXYNOS_TMU_CORE_EN_SHIFT,
 	.tmu_status = EXYNOS5440_TMU_S0_7_STATUS,
 	.tmu_cur_temp = EXYNOS5440_TMU_S0_7_TEMP,

drivers/thermal/samsung/exynos_tmu_data.h

@@ -75,6 +75,8 @@
 #define EXYNOS_TMU_TRIP_MODE_SHIFT	13
 #define EXYNOS_TMU_TRIP_MODE_MASK	0x7
 #define EXYNOS_TMU_THERM_TRIP_EN_SHIFT	12
+#define EXYNOS_TMU_CALIB_MODE_SHIFT	4
+#define EXYNOS_TMU_CALIB_MODE_MASK	0x3
 
 #define EXYNOS_TMU_INTEN_RISE0_SHIFT	0
 #define EXYNOS_TMU_INTEN_RISE1_SHIFT	4