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From:   <michael.kao@mediatek.com>
To:     <michael.kao@mediatek.com>, Zhang Rui <rui.zhang@intel.com>,
        "Eduardo Valentin" <edubezval@gmail.com>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        <hsinyi@chromium.org>
CC:     <linux-pm@vger.kernel.org>, <devicetree@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-mediatek@lists.infradead.org>,
        Louis Yu <louis.yu@mediatek.com>
Subject: [RESEND PATCH] thermal: mediatek: add suspend/resume callback
Date:   Wed, 9 Oct 2019 17:35:04 +0800
Message-ID: <1570613704-16609-1-git-send-email-michael.kao@mediatek.com>
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

From: Louis Yu <louis.yu@mediatek.com>

Add suspend/resume callback to disable/enable Mediatek thermal sensor
respectively. Since thermal power domain is off in suspend, thermal driver
needs re-initialization during resume.

Signed-off-by: Louis Yu <louis.yu@mediatek.com>
Signed-off-by: Michael Kao <michael.kao@mediatek.com>
---
This patch series base on these patches [1][2].

[1]thermal: mediatek: mt8183: fix bank number settings (https://patchwork.kernel.org/patch/10938817/)
[2]thermal: mediatek: add another get_temp ops for thermal sensors (https://patchwork.kernel.org/patch/10938829/)

 drivers/thermal/mtk_thermal.c | 134 +++++++++++++++++++++++++++++++++++++++---
 1 file changed, 125 insertions(+), 9 deletions(-)

diff --git a/drivers/thermal/mtk_thermal.c b/drivers/thermal/mtk_thermal.c
index 6bdd9c2..22ff2cf 100644
--- a/drivers/thermal/mtk_thermal.c
+++ b/drivers/thermal/mtk_thermal.c
@@ -22,6 +22,7 @@
 #include <linux/thermal.h>
 #include <linux/reset.h>
 #include <linux/types.h>
+#include <linux/iopoll.h>
 
 /* AUXADC Registers */
 #define AUXADC_CON1_SET_V	0x008
@@ -31,6 +32,8 @@
 
 #define APMIXED_SYS_TS_CON1	0x604
 
+#define APMIXED_SYS_TS_CON1_BUFFER_OFF	0x30
+
 /* Thermal Controller Registers */
 #define TEMP_MONCTL0		0x000
 #define TEMP_MONCTL1		0x004
@@ -38,6 +41,7 @@
 #define TEMP_MONIDET0		0x014
 #define TEMP_MONIDET1		0x018
 #define TEMP_MSRCTL0		0x038
+#define TEMP_MSRCTL1		0x03c
 #define TEMP_AHBPOLL		0x040
 #define TEMP_AHBTO		0x044
 #define TEMP_ADCPNP0		0x048
@@ -87,6 +91,9 @@
 #define TEMP_ADCVALIDMASK_VALID_HIGH		BIT(5)
 #define TEMP_ADCVALIDMASK_VALID_POS(bit)	(bit)
 
+#define TEMP_MSRCTL1_BUS_STA	(BIT(0) | BIT(7))
+#define TEMP_MSRCTL1_SENSING_POINTS_PAUSE	0x10E
+
 /* MT8173 thermal sensors */
 #define MT8173_TS1	0
 #define MT8173_TS2	1
@@ -258,6 +265,10 @@ struct mtk_thermal_data {
 struct mtk_thermal {
 	struct device *dev;
 	void __iomem *thermal_base;
+	void __iomem *apmixed_base;
+	void __iomem *auxadc_base;
+	u64 apmixed_phys_base;
+	u64 auxadc_phys_base;
 
 	struct clk *clk_peri_therm;
 	struct clk *clk_auxadc;
@@ -787,6 +798,42 @@ static void mtk_thermal_init_bank(struct mtk_thermal *mt, int num,
 	mtk_thermal_put_bank(bank);
 }
 
+static int mtk_thermal_disable_sensing(struct mtk_thermal *mt, int num)
+{
+	struct mtk_thermal_bank *bank = &mt->banks[num];
+	u32 val;
+	unsigned long timeout;
+	void __iomem *addr;
+	int ret = 0;
+
+	bank->id = num;
+	bank->mt = mt;
+
+	mtk_thermal_get_bank(bank);
+
+	val = readl(mt->thermal_base + TEMP_MSRCTL1);
+	/* pause periodic temperature measurement for sensing points */
+	writel(val | TEMP_MSRCTL1_SENSING_POINTS_PAUSE,
+	       mt->thermal_base + TEMP_MSRCTL1);
+
+	/* wait until temperature measurement bus idle */
+	timeout = jiffies + HZ;
+	addr = mt->thermal_base + TEMP_MSRCTL1;
+
+	ret = readl_poll_timeout(addr, val, (val & TEMP_MSRCTL1_BUS_STA) == 0x0,
+				 0, timeout);
+	if (ret < 0)
+		goto out;
+
+	/* disable periodic temperature meausrement on sensing points */
+	writel(0x0, mt->thermal_base + TEMP_MONCTL0);
+
+out:
+	mtk_thermal_put_bank(bank);
+
+	return ret;
+}
+
 static u64 of_get_phys_base(struct device_node *np)
 {
 	u64 size64;
@@ -909,7 +956,6 @@ static int mtk_thermal_probe(struct platform_device *pdev)
 	struct device_node *auxadc, *apmixedsys, *np = pdev->dev.of_node;
 	struct mtk_thermal *mt;
 	struct resource *res;
-	u64 auxadc_phys_base, apmixed_phys_base;
 	struct thermal_zone_device *tzdev;
 	struct mtk_thermal_zone *tz;
 
@@ -946,11 +992,11 @@ static int mtk_thermal_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	auxadc_phys_base = of_get_phys_base(auxadc);
+	mt->auxadc_phys_base = of_get_phys_base(auxadc);
 
 	of_node_put(auxadc);
 
-	if (auxadc_phys_base == OF_BAD_ADDR) {
+	if (mt->auxadc_phys_base == OF_BAD_ADDR) {
 		dev_err(&pdev->dev, "Can't get auxadc phys address\n");
 		return -EINVAL;
 	}
@@ -961,11 +1007,12 @@ static int mtk_thermal_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	apmixed_phys_base = of_get_phys_base(apmixedsys);
+	mt->apmixed_phys_base = of_get_phys_base(apmixedsys);
+	mt->apmixed_base = of_iomap(apmixedsys, 0);
 
 	of_node_put(apmixedsys);
 
-	if (apmixed_phys_base == OF_BAD_ADDR) {
+	if (mt->apmixed_phys_base == OF_BAD_ADDR) {
 		dev_err(&pdev->dev, "Can't get auxadc phys address\n");
 		return -EINVAL;
 	}
@@ -977,19 +1024,19 @@ static int mtk_thermal_probe(struct platform_device *pdev)
 	ret = clk_prepare_enable(mt->clk_auxadc);
 	if (ret) {
 		dev_err(&pdev->dev, "Can't enable auxadc clk: %d\n", ret);
-		return ret;
+		goto err_disable_clk_auxadc;
 	}
 
 	ret = clk_prepare_enable(mt->clk_peri_therm);
 	if (ret) {
 		dev_err(&pdev->dev, "Can't enable peri clk: %d\n", ret);
-		goto err_disable_clk_auxadc;
+		goto err_disable_clk_peri_therm;
 	}
 
 	for (ctrl_id = 0; ctrl_id < mt->conf->num_controller ; ctrl_id++)
 		for (i = 0; i < mt->conf->num_banks; i++)
-			mtk_thermal_init_bank(mt, i, apmixed_phys_base,
-					      auxadc_phys_base, ctrl_id);
+			mtk_thermal_init_bank(mt, i, mt->apmixed_phys_base,
+					      mt->auxadc_phys_base, ctrl_id);
 
 	platform_set_drvdata(pdev, mt);
 
@@ -1033,11 +1080,80 @@ static int mtk_thermal_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static int __maybe_unused mtk_thermal_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct mtk_thermal *mt = platform_get_drvdata(pdev);
+	int i, ret;
+
+	for (i = 0; i < mt->conf->num_banks; i++) {
+		ret = mtk_thermal_disable_sensing(mt, i);
+		if (ret)
+			goto out;
+	}
+
+	/* disable buffer */
+	writel(readl(mt->apmixed_base + APMIXED_SYS_TS_CON1) |
+	       APMIXED_SYS_TS_CON1_BUFFER_OFF,
+	       mt->apmixed_base + APMIXED_SYS_TS_CON1);
+
+	clk_disable_unprepare(mt->clk_peri_therm);
+	clk_disable_unprepare(mt->clk_auxadc);
+
+	return 0;
+
+out:
+	dev_err(&pdev->dev, "Failed to wait until bus idle\n");
+
+	return ret;
+}
+
+static int __maybe_unused mtk_thermal_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct mtk_thermal *mt = platform_get_drvdata(pdev);
+	int i, ret, ctrl_id;
+
+	ret = device_reset(&pdev->dev);
+	if (ret)
+		return ret;
+
+	ret = clk_prepare_enable(mt->clk_auxadc);
+	if (ret) {
+		dev_err(&pdev->dev, "Can't enable auxadc clk: %d\n", ret);
+		goto err_disable_clk_auxadc;
+	}
+
+	ret = clk_prepare_enable(mt->clk_peri_therm);
+	if (ret) {
+		dev_err(&pdev->dev, "Can't enable peri clk: %d\n", ret);
+		goto err_disable_clk_peri_therm;
+	}
+
+	for (ctrl_id = 0; ctrl_id < mt->conf->num_controller ; ctrl_id++)
+		for (i = 0; i < mt->conf->num_banks; i++)
+			mtk_thermal_init_bank(mt, i, mt->apmixed_phys_base,
+					      mt->auxadc_phys_base, ctrl_id);
+
+	return 0;
+
+err_disable_clk_peri_therm:
+	clk_disable_unprepare(mt->clk_peri_therm);
+err_disable_clk_auxadc:
+	clk_disable_unprepare(mt->clk_auxadc);
+
+	return ret;
+}
+
+static SIMPLE_DEV_PM_OPS(mtk_thermal_pm_ops,
+			 mtk_thermal_suspend, mtk_thermal_resume);
+
 static struct platform_driver mtk_thermal_driver = {
 	.probe = mtk_thermal_probe,
 	.remove = mtk_thermal_remove,
 	.driver = {
 		.name = "mtk-thermal",
+		.pm = &mtk_thermal_pm_ops,
 		.of_match_table = mtk_thermal_of_match,
 	},
 };
-- 
1.9.1