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Date: Tue, 14 May 2013 15:28:52 +0530
From: Amit Daniel Kachhap <amit.daniel@...sung.com>
To: linux-pm@...r.kernel.org
Cc: Zhang Rui <rui.zhang@...el.com>, linux-samsung-soc@...r.kernel.org,
linux-kernel@...r.kernel.org, amit.kachhap@...il.com,
Kukjin Kim <kgene.kim@...sung.com>,
Eduardo Valentin <eduardo.valentin@...com>
Subject: [PATCH V4 22/30] thermal: exynos: Add support for exynos5440 TMU sensor.
This patch modifies TMU controller to add changes needed to work with
exynos5440 platform. This sensor registers 3 instance of the tmu controller
with the thermal zone and hence reports 3 temperature output. This controller
supports upto five trip points. For critical threshold the driver uses the
core driver thermal framework for shutdown.
Acked-by: Kukjin Kim <kgene.kim@...sung.com>
Signed-off-by: Amit Daniel Kachhap <amit.daniel@...sung.com>
---
.../devicetree/bindings/thermal/exynos-thermal.txt | 28 ++++++++++++-
drivers/thermal/samsung/exynos_tmu.c | 43 +++++++++++++++++--
drivers/thermal/samsung/exynos_tmu.h | 6 +++
drivers/thermal/samsung/exynos_tmu_data.h | 2 +
4 files changed, 72 insertions(+), 7 deletions(-)
diff --git a/Documentation/devicetree/bindings/thermal/exynos-thermal.txt b/Documentation/devicetree/bindings/thermal/exynos-thermal.txt
index 535fd0e..970eeba 100644
--- a/Documentation/devicetree/bindings/thermal/exynos-thermal.txt
+++ b/Documentation/devicetree/bindings/thermal/exynos-thermal.txt
@@ -6,13 +6,16 @@
"samsung,exynos4412-tmu"
"samsung,exynos4210-tmu"
"samsung,exynos5250-tmu"
+ "samsung,exynos5440-tmu"
- interrupt-parent : The phandle for the interrupt controller
-- reg : Address range of the thermal registers
+- reg : Address range of the thermal registers. For exynos5440-tmu which has 3
+ instances of TMU, 2 set of register has to supplied. First set belongs
+ to each instance of TMU and second set belongs to common TMU registers.
- interrupts : Should contain interrupt for thermal system
- clocks : The main clock for TMU device
- clock-names : Thermal system clock name
-Example:
+Example 1):
tmu@...C0000 {
compatible = "samsung,exynos4412-tmu";
@@ -23,3 +26,24 @@ Example:
clock-names = "tmu_apbif";
status = "disabled";
};
+
+Example 2):
+
+ tmuctrl_0: tmuctrl@...118 {
+ compatible = "samsung,exynos5440-tmu";
+ reg = <0x160118 0x230>, <0x160368 0x10>;
+ interrupts = <0 58 0>;
+ clocks = <&clock 21>;
+ clock-names = "tmu_apbif";
+ };
+
+Note: For multi-instance tmu each instance should have an alias correctly
+numbered in "aliases" node.
+
+Example:
+
+aliases {
+ tmuctrl0 = &tmuctrl_0;
+ tmuctrl1 = &tmuctrl_1;
+ tmuctrl2 = &tmuctrl_2;
+};
diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
index 7f7b1cf..7ca9c4d 100644
--- a/drivers/thermal/samsung/exynos_tmu.c
+++ b/drivers/thermal/samsung/exynos_tmu.c
@@ -185,9 +185,11 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
reg->threshold_th0 + i * sizeof(reg->threshold_th0));
writel(reg->inten_rise_mask, data->base + reg->tmu_intclear);
- } else if (data->soc == SOC_ARCH_EXYNOS) {
+ } else if (data->soc == SOC_ARCH_EXYNOS ||
+ data->soc == SOC_ARCH_EXYNOS5440) {
/* Write temperature code for rising and falling threshold */
- for (i = 0; i < trigger_levs; i++) {
+ for (i = 0;
+ i < trigger_levs && i < EXYNOS_MAX_TRIGGER_PER_REG; i++) {
threshold_code = temp_to_code(data,
pdata->trigger_levels[i]);
if (threshold_code < 0) {
@@ -218,7 +220,30 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
writel((reg->inten_rise_mask << reg->inten_rise_shift) |
(reg->inten_fall_mask << reg->inten_fall_shift),
data->base + reg->tmu_intclear);
+
+ /* if 5th threshold limit is also present, use TH2 register */
+ i = EXYNOS_MAX_TRIGGER_PER_REG;
+ if (pdata->trigger_levels[i]) {
+ threshold_code = temp_to_code(data,
+ pdata->trigger_levels[i]);
+ if (threshold_code < 0) {
+ ret = threshold_code;
+ goto out;
+ }
+ rising_threshold =
+ threshold_code << reg->threshold_th3_l0_shift;
+ writel(rising_threshold,
+ data->base + reg->threshold_th2);
+ if (pdata->trigger_type[i] == HW_TRIP) {
+ con = readl(data->base + reg->tmu_ctrl);
+ con |= (1 << reg->therm_trip_en_shift);
+ writel(con, data->base + reg->tmu_ctrl);
+ }
+ }
}
+ /*Clear the PMIN in the common TMU register*/
+ if (reg->tmu_pmin && !data->id)
+ writel(0, data->base_common + reg->tmu_pmin);
out:
clk_disable(data->clk);
mutex_unlock(&data->lock);
@@ -345,7 +370,14 @@ static void exynos_tmu_work(struct work_struct *work)
struct exynos_tmu_data, irq_work);
struct exynos_tmu_platform_data *pdata = data->pdata;
const struct exynos_tmu_registers *reg = pdata->registers;
- unsigned int val_irq;
+ unsigned int val_irq, val_type;
+
+ /* Find which sensor generated this interrupt */
+ if (reg->tmu_irqstatus) {
+ val_type = readl(data->base_common + reg->tmu_irqstatus);
+ if (!((val_type >> data->id) & 0x1))
+ goto out;
+ }
exynos_report_trigger(data->reg_conf);
mutex_lock(&data->lock);
@@ -358,7 +390,7 @@ static void exynos_tmu_work(struct work_struct *work)
clk_disable(data->clk);
mutex_unlock(&data->lock);
-
+out:
enable_irq(data->irq);
}
@@ -520,7 +552,8 @@ static int exynos_tmu_probe(struct platform_device *pdev)
return ret;
if (pdata->type == SOC_ARCH_EXYNOS ||
- pdata->type == SOC_ARCH_EXYNOS4210)
+ pdata->type == SOC_ARCH_EXYNOS4210 ||
+ pdata->type == SOC_ARCH_EXYNOS5440)
data->soc = pdata->type;
else {
ret = -EINVAL;
diff --git a/drivers/thermal/samsung/exynos_tmu.h b/drivers/thermal/samsung/exynos_tmu.h
index 65443d7..9151a30 100644
--- a/drivers/thermal/samsung/exynos_tmu.h
+++ b/drivers/thermal/samsung/exynos_tmu.h
@@ -44,6 +44,7 @@ enum trigger_type {
enum soc_type {
SOC_ARCH_EXYNOS4210 = 1,
SOC_ARCH_EXYNOS,
+ SOC_ARCH_EXYNOS5440,
};
/**
@@ -132,6 +133,8 @@ enum soc_type {
* @emul_temp_shift: shift bits of emulation temperature.
* @emul_time_shift: shift bits of emulation time.
* @emul_time_mask: mask bits of emulation time.
+ * @tmu_irqstatus: register to find which TMU generated interrupts.
+ * @tmu_pmin: register to get/set the Pmin value.
*/
struct exynos_tmu_registers {
u32 triminfo_data;
@@ -199,6 +202,9 @@ struct exynos_tmu_registers {
u32 emul_temp_shift;
u32 emul_time_shift;
u32 emul_time_mask;
+
+ u32 tmu_irqstatus;
+ u32 tmu_pmin;
};
/**
diff --git a/drivers/thermal/samsung/exynos_tmu_data.h b/drivers/thermal/samsung/exynos_tmu_data.h
index 0e2244f..4acf070 100644
--- a/drivers/thermal/samsung/exynos_tmu_data.h
+++ b/drivers/thermal/samsung/exynos_tmu_data.h
@@ -91,6 +91,8 @@
#define EXYNOS_EMUL_DATA_MASK 0xFF
#define EXYNOS_EMUL_ENABLE 0x1
+#define EXYNOS_MAX_TRIGGER_PER_REG 4
+
#if defined(CONFIG_CPU_EXYNOS4210)
extern struct exynos_tmu_platform_data const exynos4210_default_tmu_data;
#define EXYNOS4210_TMU_DRV_DATA (&exynos4210_default_tmu_data)
--
1.7.1
--
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