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.nav...@samsung.com> Reviewed-by: Doug Anderson <diand...@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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
