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Subject[PATCH] thermal: exynos: Handle the misplaced TRIMINFO register
Date
This patch adds code to handle the misplaced TRIMINFO register
incase of Exynos5420.

On Exynos5420 we have a TRIMINFO register being misplaced for
TMU channels 2, 3 and 4

TRIMINFO at 0x1006c000 contains data for TMU channel 3
TRIMINFO at 0x100a0000 contains data for TMU channel 4
TRIMINFO at 0x10068000 contains data for TMU channel 2

The misplaced register address is passed through devicetree and
map it seperately during probe.
Also, adds the documentation under devicetree/bindings/thermal/

Signed-off-by: Naveen Krishna Chatradhi <ch.naveen@samsung.com>
Reviewed-by: Doug Anderson <dianders@chromium.org>
---

Rebased on http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
master branch. I'm not sure which one is the right tree to rebase.

.../devicetree/bindings/thermal/exynos-thermal.txt | 48 ++++++++++++++++++++++
drivers/thermal/exynos_thermal.c | 26 +++++++++++-
2 files changed, 72 insertions(+), 2 deletions(-)
create mode 100644 Documentation/devicetree/bindings/thermal/exynos-thermal.txt

diff --git a/Documentation/devicetree/bindings/thermal/exynos-thermal.txt b/Documentation/devicetree/bindings/thermal/exynos-thermal.txt
new file mode 100644
index 0000000..1db279e
--- /dev/null
+++ b/Documentation/devicetree/bindings/thermal/exynos-thermal.txt
@@ -0,0 +1,48 @@
+* Exynos Thermal
+
+Required properties:
+- compatible: should be one of the following.
+ * "samsung,exynos4210-tmu" - for controllers compatible with exynos4210 tmu.
+ * "samsung,exynos5250-tmu" - for controllers compatible with exynos5250 tmu.
+ * "samsung,exynos5420-tmu" - for controllers compatible with exynos5420 tmu.
+
+- reg: physical base address of the controller and length of
+ memory mapped region.
+
+ ** NOTE FOR EXYNOS5420 **
+ TRIMINFO register is being misplaced for TMU channels 2, 3 and 4
+
+ TERMINFO for TMU channel 2 is present in address space of TMU channel 3
+ TERMINFO for TMU channel 3 is present in address space of TMU channel 4
+ TERMINFO for TMU channel 4 is present in address space of TMU channel 2
+
+ * In such cases the reg property contains the misplaced register address and
+ range as the second parameter.
+
+- interrupts : interrupt number to the cpu.
+- clocks : Clock number as per common clock framework for the cpu.
+- clock-names : clock name to be used in the driver
+
+Example:
+
+ /* tmu for CPU0 */
+ tmu@10060000 {
+ compatible = "samsung,exynos5420-tmu";
+ reg = <0x10060000 0x100>;
+ interrupts = <0 65 0>;
+ clocks = <&clock 318>;
+ clock-names = "tmu_apbif";
+ };
+
+Example: In case of Exynos5420 TMU channel 3
+
+ /* tmu for CPU3 */
+ tmu@1006c000 {
+ compatible = "samsung,exynos5420-tmu";
+ /* 2nd reg is for the misplaced TRIMINFO register */
+ reg = <0x1006c000 0x100>, <0x100a0000 0x4>;
+ interrupts = <0 185 0>;
+ clocks = <&clock 318>;
+ clock-names = "tmu_apbif";
+ };
+
diff --git a/drivers/thermal/exynos_thermal.c b/drivers/thermal/exynos_thermal.c
index cec3f1f..a229314 100644
--- a/drivers/thermal/exynos_thermal.c
+++ b/drivers/thermal/exynos_thermal.c
@@ -38,6 +38,7 @@
#include <linux/cpufreq.h>
#include <linux/cpu_cooling.h>
#include <linux/of.h>
+#include <linux/of_address.h>

#include <plat/cpu.h>
#include <mach/regs-pmu.h> /* for EXYNOS5_PS_HOLD_CONTROL */
@@ -123,7 +124,7 @@ struct exynos_thermal_zone;
struct exynos_tmu_data {
struct exynos_tmu_platform_data *pdata;
struct resource *mem;
- void __iomem *base;
+ void __iomem *base, *triminfo_base;
int irq;
enum soc_type soc;
struct work_struct irq_work;
@@ -665,8 +666,14 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
__raw_writel(EXYNOS_TRIMINFO_RELOAD,
data->base + EXYNOS_TMU_TRIMINFO_CON);
}
+
/* Save trimming info in order to perform calibration */
- trim_info = readl(data->base + EXYNOS_TMU_REG_TRIMINFO);
+ if (data->triminfo_base)
+ /* On exynos5420 TRIMINFO is misplaced for some channels */
+ trim_info = readl(data->triminfo_base);
+ else
+ trim_info = readl(data->base + EXYNOS_TMU_REG_TRIMINFO);
+
data->temp_error1 = trim_info & EXYNOS_TMU_TRIM_TEMP_MASK;
data->temp_error2 = ((trim_info >> 8) & EXYNOS_TMU_TRIM_TEMP_MASK);

@@ -1016,6 +1023,15 @@ static int exynos_tmu_probe(struct platform_device *pdev)
return -ENODEV;
}

+ /* For Exynos5420 The misplaced TERMINFO register address will be
+ * passed from device tree node.
+ *
+ * We cannot use devm_request_and_ioremap, as the base address
+ * over laps with the address space of the other TMU channel.
+ * Check Documentation for details
+ */
+ data->triminfo_base = of_iomap(pdev->dev.of_node, 1);
+
data->clk = devm_clk_get(&pdev->dev, "tmu_apbif");
if (IS_ERR(data->clk)) {
dev_err(&pdev->dev, "Failed to get clock\n");
@@ -1086,6 +1102,9 @@ static int exynos_tmu_probe(struct platform_device *pdev)
err_irq:
exynos_unregister_thermal(data);
err_clk:
+ if (data->triminfo_base)
+ iounmap(data->triminfo_base);
+
platform_set_drvdata(pdev, NULL);
clk_unprepare(data->clk);
return ret;
@@ -1100,6 +1119,9 @@ static int exynos_tmu_remove(struct platform_device *pdev)

exynos_unregister_thermal(data);

+ if (data->triminfo_base)
+ iounmap(data->triminfo_base);
+
clk_unprepare(data->clk);

platform_set_drvdata(pdev, NULL);
--
1.7.12.4


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