From patchwork Sat Feb 4 03:39:57 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Baoyou Xie X-Patchwork-Id: 93343 Delivered-To: patch@linaro.org Received: by 10.140.20.99 with SMTP id 90csp874573qgi; Fri, 3 Feb 2017 19:41:22 -0800 (PST) X-Received: by 10.99.215.5 with SMTP id d5mr463398pgg.51.1486179682331; Fri, 03 Feb 2017 19:41:22 -0800 (PST) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id q26si22527920pgc.152.2017.02.03.19.41.22; Fri, 03 Feb 2017 19:41:22 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of devicetree-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=neutral (body hash did not verify) header.i=@linaro.org; spf=pass (google.com: best guess record for domain of devicetree-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=devicetree-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753656AbdBDDlV (ORCPT + 7 others); Fri, 3 Feb 2017 22:41:21 -0500 Received: from mail-pg0-f42.google.com ([74.125.83.42]:35107 "EHLO mail-pg0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753652AbdBDDlT (ORCPT ); Fri, 3 Feb 2017 22:41:19 -0500 Received: by mail-pg0-f42.google.com with SMTP id 194so11717369pgd.2 for ; Fri, 03 Feb 2017 19:41:19 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=hOb/p5y+sm0gCNT12lMyPEqhRiP7S3WeCDeAm4bnqpI=; b=N7oDK+jGX2We72btGbI3ziKYkN0F8yeTabLuOMbjJrZwLn+vltVj5+0NvF/RoD5h3n UBoGp2C4Sjz1AbVCoog3Fg8MNlFo3ym7wHCji9USAeM9nF4VtwJlGaFaoYPpbpRYFe27 9KgWq82BulchSWPQHJ7k2nNFIsn1oC5Rhia9o= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=hOb/p5y+sm0gCNT12lMyPEqhRiP7S3WeCDeAm4bnqpI=; b=C/wH9zT5qkeW369RU7OsPsD6s5eipDVgKIUY4KNy+ROIYdJ06vkoRGEdDMnlJHVdI3 2VjUe2TcVggEWdjFQjIIzFJyaUr31x59sg44vZYG3Rxgu13GpziwwahmZWSxENiDkJ8V 3aXhT5R01b+Tov8zGkeMYLk5kWfz9MD4YiYrltqy9r4qWI+P1kYvGXxXCW+b6eOnyg7C ik3SMKuilme51JbtGPgnhxNmYQEQdtN8Lb0DEznei4EpEDpwYJQ7b+cub43zH0rx7c+9 xlE59eO6N/w9Lw/mm4zieErqWZGNQr9GoEt+CnJ6oWJFdY2vgFXy6r/g4pPDPExemxny m0/A== X-Gm-Message-State: AIkVDXIbvloZwo2DiAp0fxPqz9QJ+ZL/xhysbQEYFoqeQOcbKOyuwMkvqzvYAAC/+JG92mlS X-Received: by 10.98.117.10 with SMTP id q10mr447943pfc.31.1486179673887; Fri, 03 Feb 2017 19:41:13 -0800 (PST) Received: from localhost.localdomain ([104.237.91.15]) by smtp.gmail.com with ESMTPSA id e127sm70330673pfh.89.2017.02.03.19.41.04 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 03 Feb 2017 19:41:13 -0800 (PST) From: Baoyou Xie To: mathieu.poirier@linaro.org, jun.nie@linaro.org, rui.zhang@intel.com, edubezval@gmail.com, robh+dt@kernel.org, mark.rutland@arm.com Cc: linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, shawnguo@kernel.org, baoyou.xie@linaro.org, xie.baoyou@zte.com.cn, chen.chaokai@zte.com.cn, wang.qiang01@zte.com.cn Subject: [PATCH v8 3/3] thermal: zx2967: add thermal driver for ZTE's zx2967 family Date: Sat, 4 Feb 2017 11:39:57 +0800 Message-Id: <1486179597-30953-3-git-send-email-baoyou.xie@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1486179597-30953-1-git-send-email-baoyou.xie@linaro.org> References: <1486179597-30953-1-git-send-email-baoyou.xie@linaro.org> Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org This patch adds thermal driver for ZTE's zx2967 family. Signed-off-by: Baoyou Xie --- drivers/thermal/Kconfig | 8 ++ drivers/thermal/Makefile | 1 + drivers/thermal/zx2967_thermal.c | 255 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 264 insertions(+) create mode 100644 drivers/thermal/zx2967_thermal.c -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index 18f2de6..f64bd50 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -444,4 +444,12 @@ config BCM2835_THERMAL help Support for thermal sensors on Broadcom bcm2835 SoCs. +config ZX2967_THERMAL + tristate "Thermal sensors on zx2967 SoC" + depends on ARCH_ZX || COMPILE_TEST + help + Enable the zx2967 thermal sensors driver, which supports + the primitive temperature sensor embedded in zx2967 SoCs. + This sensor generates the real time die temperature. + endif diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile index 677c6d9..c00c05e 100644 --- a/drivers/thermal/Makefile +++ b/drivers/thermal/Makefile @@ -57,3 +57,4 @@ obj-$(CONFIG_HISI_THERMAL) += hisi_thermal.o obj-$(CONFIG_MTK_THERMAL) += mtk_thermal.o obj-$(CONFIG_GENERIC_ADC_THERMAL) += thermal-generic-adc.o obj-$(CONFIG_BCM2835_THERMAL) += bcm2835_thermal.o +obj-$(CONFIG_ZX2967_THERMAL) += zx2967_thermal.o diff --git a/drivers/thermal/zx2967_thermal.c b/drivers/thermal/zx2967_thermal.c new file mode 100644 index 0000000..d177238 --- /dev/null +++ b/drivers/thermal/zx2967_thermal.c @@ -0,0 +1,255 @@ +/* + * ZTE's zx2967 family thermal sensor driver + * + * Copyright (C) 2017 ZTE Ltd. + * + * Author: Baoyou Xie + * + * License terms: GNU General Public License (GPL) version 2 + */ + +#include +#include +#include +#include +#include +#include +#include + +/* Power Mode: 0->low 1->high */ +#define ZX2967_THERMAL_POWER_MODE 0 +#define ZX2967_POWER_MODE_LOW 0 +#define ZX2967_POWER_MODE_HIGH 1 + +/* DCF Control Register */ +#define ZX2967_THERMAL_DCF 0x4 +#define ZX2967_DCF_EN BIT(1) +#define ZX2967_DCF_FREEZE BIT(0) + +/* Selection Register */ +#define ZX2967_THERMAL_SEL 0x8 + +/* Control Register */ +#define ZX2967_THERMAL_CTRL 0x10 + +#define ZX2967_THERMAL_READY BIT(12) +#define ZX2967_THERMAL_TEMP_MASK GENMASK(11, 0) +#define ZX2967_THERMAL_ID_MASK 0x18 +#define ZX2967_THERMAL_ID 0x10 + +#define ZX2967_GET_TEMP_TIMEOUT_US (100 * 1024) + +/* zx2967 Thermal Sensor Private Structure */ +struct zx2967_thermal_priv { + /* struct thermal_zone_device where the sensor is registered */ + struct thermal_zone_device *tzd; + /* prevents reads sensor in parallel */ + struct mutex lock; + /* topcrm clk structure */ + struct clk *clk_topcrm; + /* apb clk structure */ + struct clk *clk_apb; + /* pointer to base address of the thermal sensor */ + void __iomem *regs; + struct device *dev; +}; + +static int zx2967_thermal_get_temp(void *data, int *temp) +{ + void __iomem *regs; + struct zx2967_thermal_priv *priv = data; + u32 val; + int ret; + + if (!priv->tzd) + return -EAGAIN; + + regs = priv->regs; + mutex_lock(&priv->lock); + writel_relaxed(ZX2967_POWER_MODE_LOW, + regs + ZX2967_THERMAL_POWER_MODE); + writel_relaxed(ZX2967_DCF_EN, regs + ZX2967_THERMAL_DCF); + + val = readl_relaxed(regs + ZX2967_THERMAL_SEL); + val &= ~ZX2967_THERMAL_ID_MASK; + val |= ZX2967_THERMAL_ID; + writel_relaxed(val, regs + ZX2967_THERMAL_SEL); + + /* + * Must wait for a while, surely it's a bit odd. + * otherwise temperature value we got has a few deviation, even if + * the THERMAL_READY bit is set. + */ + usleep_range(100, 300); + ret = readx_poll_timeout(readl, regs + ZX2967_THERMAL_CTRL, + val, val & ZX2967_THERMAL_READY, 300, + ZX2967_GET_TEMP_TIMEOUT_US); + if (ret) { + dev_err(priv->dev, "Thermal sensor data timeout\n"); + goto unlock; + } + + writel_relaxed(ZX2967_DCF_FREEZE | ZX2967_DCF_EN, + regs + ZX2967_THERMAL_DCF); + val = readl_relaxed(regs + ZX2967_THERMAL_CTRL) + & ZX2967_THERMAL_TEMP_MASK; + writel_relaxed(ZX2967_POWER_MODE_HIGH, + regs + ZX2967_THERMAL_POWER_MODE); + + /* + * Calculate temperature + * In dts, slope is multiplied by 1000. + */ + *temp = DIV_ROUND_CLOSEST(((s32)val + priv->tzd->tzp->offset) * 1000, + priv->tzd->tzp->slope); + +unlock: + mutex_unlock(&priv->lock); + return ret; +} + +static struct thermal_zone_of_device_ops zx2967_of_thermal_ops = { + .get_temp = zx2967_thermal_get_temp, +}; + +static int zx2967_thermal_probe(struct platform_device *pdev) +{ + struct zx2967_thermal_priv *priv; + struct resource *res; + int ret; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + priv->regs = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(priv->regs)) + return PTR_ERR(priv->regs); + + priv->clk_topcrm = devm_clk_get(&pdev->dev, "topcrm"); + if (IS_ERR(priv->clk_topcrm)) { + ret = PTR_ERR(priv->clk_topcrm); + dev_err(&pdev->dev, "failed to get topcrm clock: %d\n", ret); + return ret; + } + + ret = clk_prepare_enable(priv->clk_topcrm); + if (ret) { + dev_err(&pdev->dev, "failed to enable topcrm clock: %d\n", + ret); + return ret; + } + + priv->clk_apb = devm_clk_get(&pdev->dev, "apb"); + if (IS_ERR(priv->clk_apb)) { + ret = PTR_ERR(priv->clk_apb); + dev_err(&pdev->dev, "failed to get apb clock: %d\n", ret); + goto disable_clk_topcrm; + } + + ret = clk_prepare_enable(priv->clk_apb); + if (ret) { + dev_err(&pdev->dev, "failed to enable apb clock: %d\n", + ret); + goto disable_clk_topcrm; + } + + mutex_init(&priv->lock); + priv->tzd = thermal_zone_of_sensor_register(&pdev->dev, + 0, priv, &zx2967_of_thermal_ops); + + if (IS_ERR(priv->tzd)) { + ret = PTR_ERR(priv->tzd); + dev_err(&pdev->dev, "failed to register sensor: %d\n", ret); + goto disable_clk_all; + } + + if (priv->tzd->tzp->slope == 0) { + thermal_zone_of_sensor_unregister(&pdev->dev, priv->tzd); + dev_err(&pdev->dev, "coefficients of sensor is invalid\n"); + ret = -EINVAL; + goto disable_clk_all; + } + + priv->dev = &pdev->dev; + platform_set_drvdata(pdev, priv); + + return 0; + +disable_clk_all: + clk_disable_unprepare(priv->clk_apb); +disable_clk_topcrm: + clk_disable_unprepare(priv->clk_topcrm); + return ret; +} + +static int zx2967_thermal_exit(struct platform_device *pdev) +{ + struct zx2967_thermal_priv *priv = platform_get_drvdata(pdev); + + thermal_zone_of_sensor_unregister(&pdev->dev, priv->tzd); + clk_disable_unprepare(priv->clk_topcrm); + clk_disable_unprepare(priv->clk_apb); + + return 0; +} + +static const struct of_device_id zx2967_thermal_id_table[] = { + { .compatible = "zte,zx296718-thermal" }, + {} +}; +MODULE_DEVICE_TABLE(of, zx2967_thermal_id_table); + +#ifdef CONFIG_PM_SLEEP +static int zx2967_thermal_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct zx2967_thermal_priv *priv = platform_get_drvdata(pdev); + + if (priv && priv->clk_topcrm) + clk_disable_unprepare(priv->clk_topcrm); + + if (priv && priv->clk_apb) + clk_disable_unprepare(priv->clk_apb); + + return 0; +} + +static int zx2967_thermal_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct zx2967_thermal_priv *priv = platform_get_drvdata(pdev); + int error; + + error = clk_prepare_enable(priv->clk_topcrm); + if (error) + return error; + + error = clk_prepare_enable(priv->clk_apb); + if (error) { + clk_disable_unprepare(priv->clk_topcrm); + return error; + } + + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(zx2967_thermal_pm_ops, + zx2967_thermal_suspend, zx2967_thermal_resume); + +static struct platform_driver zx2967_thermal_driver = { + .probe = zx2967_thermal_probe, + .remove = zx2967_thermal_exit, + .driver = { + .name = "zx2967_thermal", + .of_match_table = zx2967_thermal_id_table, + .pm = &zx2967_thermal_pm_ops, + }, +}; +module_platform_driver(zx2967_thermal_driver); + +MODULE_AUTHOR("Baoyou Xie "); +MODULE_DESCRIPTION("ZTE zx2967 thermal driver"); +MODULE_LICENSE("GPL v2");