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Date: Wed, 7 Aug 2013 12:06:38 +0530
From: amit daniel kachhap <amit.daniel@...sung.com>
To: Naveen Krishna Chatradhi <ch.naveen@...sung.com>
Cc: linux-pm@...r.kernel.org, rui.zhang@...el.com,
eduardo.valentin@...com, linux-samsung-soc@...r.kernel.org,
linux-kernel@...r.kernel.org, kgene.kim@...sung.com,
naveenkrishna.ch@...il.com
Subject: Re: [PATCH v2] thermal: exynos: Handle the misplaced TRIMINFO register
Hi Naveen,
On Thu, Aug 1, 2013 at 4:06 PM, Naveen Krishna Chatradhi
<ch.naveen@...sung.com> wrote:
> 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@...sung.com>
> Reviewed-by: Doug Anderson <dianders@...omium.org>
> ---
> Changes since v1:
> Rebased on http://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal.git
Is it rebased against next branch?
>
> .../devicetree/bindings/thermal/exynos-thermal.txt | 48 ++++++++++++++++++++
> drivers/thermal/exynos_thermal.c | 26 ++++++++++-
In the new directory structure this file is renamed as
drivers/thermal/samsung/exynos_tmu.c.
Thanks,
Amit Daniel
> 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@...60000 {
> + 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@...6c000 {
> + 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 d20ce9e..1ad9005 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>
>
> /* Exynos generic registers */
> #define EXYNOS_TMU_REG_TRIMINFO 0x0
> @@ -120,7 +121,7 @@
> 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;
> @@ -593,8 +594,14 @@ 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);
>
> @@ -941,6 +948,15 @@ static int exynos_tmu_probe(struct platform_device *pdev)
> return ret;
> }
>
> + /* 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");
> @@ -1001,6 +1017,9 @@ static int exynos_tmu_probe(struct platform_device *pdev)
>
> return 0;
> err_clk:
> + if (data->triminfo_base)
> + iounmap(data->triminfo_base);
> +
> platform_set_drvdata(pdev, NULL);
> clk_unprepare(data->clk);
> return ret;
> @@ -1014,6 +1033,9 @@ static int exynos_tmu_remove(struct platform_device *pdev)
>
> exynos_unregister_thermal();
>
> + if (data->triminfo_base)
> + iounmap(data->triminfo_base);
> +
> clk_unprepare(data->clk);
>
> platform_set_drvdata(pdev, NULL);
> --
> 1.7.9.5
>
> --
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