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Date: Wed, 19 Jun 2013 22:06:51 -0400
From: Eduardo Valentin <eduardo.valentin@...com>
To: Amit Daniel Kachhap <amit.daniel@...sung.com>
CC: <linux-pm@...r.kernel.org>, Zhang Rui <rui.zhang@...el.com>,
Eduardo Valentin <eduardo.valentin@...com>,
<linux-samsung-soc@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <amit.kachhap@...il.com>,
Kukjin Kim <kgene.kim@...sung.com>, <jonghwa3.lee@...sung.com>
Subject: Re: [PATCH V6 23/30] thermal: exynos: Add driver support for exynos5440
TMU sensor
On 17-06-2013 02:46, Amit Daniel Kachhap wrote:
> 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: Jonghwa Lee <jonghwa3.lee@...sung.com>
> Acked-by: Kukjin Kim <kgene.kim@...sung.com>
> Signed-off-by: Jungseok Lee <jays.lee@...sung.com>
> Signed-off-by: Amit Daniel Kachhap <amit.daniel@...sung.com>
> ---
> .../devicetree/bindings/thermal/exynos-thermal.txt | 24 ++++++++-
> drivers/thermal/samsung/exynos_thermal_common.h | 2 +-
> drivers/thermal/samsung/exynos_tmu.c | 54 +++++++++++++++++---
> drivers/thermal/samsung/exynos_tmu.h | 6 ++
> drivers/thermal/samsung/exynos_tmu_data.h | 36 +++++++++++++
> 5 files changed, 112 insertions(+), 10 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/thermal/exynos-thermal.txt b/Documentation/devicetree/bindings/thermal/exynos-thermal.txt
> index 0ea33f7..e6386ea 100644
> --- a/Documentation/devicetree/bindings/thermal/exynos-thermal.txt
> +++ b/Documentation/devicetree/bindings/thermal/exynos-thermal.txt
> @@ -6,6 +6,7 @@
> "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. For soc's which has multiple
> instances of TMU and some registers are shared across all TMU's like
> @@ -16,7 +17,7 @@
> - clocks : The main clock for TMU device
> - clock-names : Thermal system clock name
>
> -Example:
> +Example 1):
>
> tmu@...C0000 {
> compatible = "samsung,exynos4412-tmu";
> @@ -27,3 +28,24 @@ 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_thermal_common.h b/drivers/thermal/samsung/exynos_thermal_common.h
> index 0c189d6..7d7c29a 100644
> --- a/drivers/thermal/samsung/exynos_thermal_common.h
> +++ b/drivers/thermal/samsung/exynos_thermal_common.h
> @@ -27,7 +27,7 @@
> #define SENSOR_NAME_LEN 16
> #define MAX_TRIP_COUNT 8
> #define MAX_COOLING_DEVICE 4
> -#define MAX_THRESHOLD_LEVS 4
> +#define MAX_THRESHOLD_LEVS 5
>
> #define ACTIVE_INTERVAL 500
> #define IDLE_INTERVAL 10000
> diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
> index 150a869..db4035d 100644
> --- a/drivers/thermal/samsung/exynos_tmu.c
> +++ b/drivers/thermal/samsung/exynos_tmu.c
> @@ -156,7 +156,26 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
> __raw_writel(1, data->base + reg->triminfo_ctrl);
>
> /* Save trimming info in order to perform calibration */
> - trim_info = readl(data->base + reg->triminfo_data);
> + if (data->soc == SOC_ARCH_EXYNOS5440) {
should this become some bit at your pdata->features? TMU_SUPPORTS(pdata,
TRIMINFO) for instance?
> + /*
> + * For exynos5440 soc triminfo value is swapped between TMU0 and
> + * TMU2, so the below logic is needed.
> + */
> + switch (data->id) {
> + case 0:
> + trim_info = readl(data->base +
> + EXYNOS5440_EFUSE_SWAP_OFFSET + reg->triminfo_data);
> + break;
> + case 1:
> + trim_info = readl(data->base + reg->triminfo_data);
> + break;
> + case 2:
> + trim_info = readl(data->base -
> + EXYNOS5440_EFUSE_SWAP_OFFSET + reg->triminfo_data);
> + }
> + } else {
> + trim_info = readl(data->base + reg->triminfo_data);
> + }
> data->temp_error1 = trim_info & EXYNOS_TMU_TEMP_MASK;
> data->temp_error2 = ((trim_info >> reg->triminfo_85_shift) &
> EXYNOS_TMU_TEMP_MASK);
> @@ -201,7 +220,8 @@ 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 < EXYNOS_MAX_TRIGGER_PER_REG; i++) {
> @@ -241,14 +261,24 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
> ret = threshold_code;
> goto out;
> }
> - rising_threshold |= threshold_code << 8 * i;
> - writel(rising_threshold,
> - data->base + reg->threshold_th0);
> + if (data->soc == SOC_ARCH_EXYNOS) {
> + rising_threshold |= threshold_code << 8 * i;
> + writel(rising_threshold,
> + data->base + reg->threshold_th0);
> + } else if (data->soc == SOC_ARCH_EXYNOS5440) {
Can these ifs be translated to some TMU_SUPPORTS()?
Just wondering if it is possible to get rid of data->soc flags and use
only features or represent the shifts as fields inside your pdata.
> + rising_threshold =
> + threshold_code << reg->threshold_th3_l0_shift;
> + writel(rising_threshold,
> + data->base + reg->threshold_th2);
> + }
> 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);
What happens to other TMU instances when one of them performs this
operation? does it need to serialized?
> out:
> clk_disable(data->clk);
> mutex_unlock(&data->lock);
> @@ -377,7 +407,14 @@ 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);
> @@ -390,7 +427,7 @@ static void exynos_tmu_work(struct work_struct *work)
>
> clk_disable(data->clk);
> mutex_unlock(&data->lock);
> -
> +out:
> enable_irq(data->irq);
> }
>
> @@ -544,7 +581,8 @@ 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 6f55673..73aaed7 100644
> --- a/drivers/thermal/samsung/exynos_tmu.h
> +++ b/drivers/thermal/samsung/exynos_tmu.h
> @@ -38,6 +38,7 @@ enum calibration_mode {
> enum soc_type {
> SOC_ARCH_EXYNOS4210 = 1,
> SOC_ARCH_EXYNOS,
> + SOC_ARCH_EXYNOS5440,
> };
>
> /**
> @@ -129,6 +130,8 @@ 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;
> @@ -196,6 +199,9 @@ 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 139dbbb..ad263e9 100644
> --- a/drivers/thermal/samsung/exynos_tmu_data.h
> +++ b/drivers/thermal/samsung/exynos_tmu_data.h
> @@ -93,6 +93,42 @@
>
> #define EXYNOS_MAX_TRIGGER_PER_REG 4
>
> +/*exynos5440 specific registers*/
> +#define EXYNOS5440_TMU_S0_7_TRIM 0x000
> +#define EXYNOS5440_TMU_S0_7_CTRL 0x020
> +#define EXYNOS5440_TMU_S0_7_DEBUG 0x040
> +#define EXYNOS5440_TMU_S0_7_STATUS 0x060
> +#define EXYNOS5440_TMU_S0_7_TEMP 0x0f0
> +#define EXYNOS5440_TMU_S0_7_TH0 0x110
> +#define EXYNOS5440_TMU_S0_7_TH1 0x130
> +#define EXYNOS5440_TMU_S0_7_TH2 0x150
> +#define EXYNOS5440_TMU_S0_7_EVTEN 0x1F0
> +#define EXYNOS5440_TMU_S0_7_IRQEN 0x210
> +#define EXYNOS5440_TMU_S0_7_IRQ 0x230
> +/* exynos5440 common registers */
> +#define EXYNOS5440_TMU_IRQ_STATUS 0x000
> +#define EXYNOS5440_TMU_PMIN 0x004
> +#define EXYNOS5440_TMU_TEMP 0x008
> +
> +#define EXYNOS5440_TMU_RISE_INT_MASK 0xf
> +#define EXYNOS5440_TMU_RISE_INT_SHIFT 0
> +#define EXYNOS5440_TMU_FALL_INT_MASK 0xf
> +#define EXYNOS5440_TMU_FALL_INT_SHIFT 4
> +#define EXYNOS5440_TMU_INTEN_RISE0_SHIFT 0
> +#define EXYNOS5440_TMU_INTEN_RISE1_SHIFT 1
> +#define EXYNOS5440_TMU_INTEN_RISE2_SHIFT 2
> +#define EXYNOS5440_TMU_INTEN_RISE3_SHIFT 3
> +#define EXYNOS5440_TMU_INTEN_FALL0_SHIFT 4
> +#define EXYNOS5440_TMU_INTEN_FALL1_SHIFT 5
> +#define EXYNOS5440_TMU_INTEN_FALL2_SHIFT 6
> +#define EXYNOS5440_TMU_INTEN_FALL3_SHIFT 7
> +#define EXYNOS5440_TMU_TH_RISE0_SHIFT 0
> +#define EXYNOS5440_TMU_TH_RISE1_SHIFT 8
> +#define EXYNOS5440_TMU_TH_RISE2_SHIFT 16
> +#define EXYNOS5440_TMU_TH_RISE3_SHIFT 24
> +#define EXYNOS5440_TMU_TH_RISE4_SHIFT 24
> +#define EXYNOS5440_EFUSE_SWAP_OFFSET 8
> +
> #if defined(CONFIG_CPU_EXYNOS4210)
> extern struct exynos_tmu_init_data const exynos4210_default_tmu_data;
> #define EXYNOS4210_TMU_DRV_DATA (&exynos4210_default_tmu_data)
>
--
You have got to be excited about what you are doing. (L. Lamport)
Eduardo Valentin
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