From patchwork Fri Feb 3 10:10:55 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Baoyou Xie X-Patchwork-Id: 9553787 X-Patchwork-Delegate: eduardo.valentin@ti.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id EBD2560405 for ; Fri, 3 Feb 2017 10:12:24 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DC1DA2839A for ; Fri, 3 Feb 2017 10:12:24 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D097328507; Fri, 3 Feb 2017 10:12:24 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, HK_RANDOM_FROM, RCVD_IN_DNSWL_HI, T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 03F8D2839A for ; Fri, 3 Feb 2017 10:12:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753133AbdBCKMW (ORCPT ); Fri, 3 Feb 2017 05:12:22 -0500 Received: from mail-pg0-f54.google.com ([74.125.83.54]:34755 "EHLO mail-pg0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753127AbdBCKMU (ORCPT ); Fri, 3 Feb 2017 05:12:20 -0500 Received: by mail-pg0-f54.google.com with SMTP id 14so5681479pgg.1 for ; Fri, 03 Feb 2017 02:12:20 -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=4jSZSQ96hyKVLsUb8BwSKAq0OtZoevGUP3n0ZqZd/qs=; b=ACKT+hjKUAiMRxS90RzKMSSgZbG+oaAnTtuaWgxZ7MsBitPMmZlIRsLCv4nnQGajq1 /kAibrq3I7M1MDvNts/wYqAI3i36HyOIsv92haL3SNx0NxAGleXCUjUJpLX6f6zgQ2kM +higYr/bnWtkrR/qUDWuvxJfQpjR2HHU+Pc+A= 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=4jSZSQ96hyKVLsUb8BwSKAq0OtZoevGUP3n0ZqZd/qs=; b=k5dD9zExlFET4NuZdR++24sfCRKTFQoATS2BFFehl98REI/nsoU69EV9ERz/Avx0Bz 8Mu+AaaqSoFewRchVoYkSYGtNAVBAAqoiagQtAwFdG3xTO88dqd3D0qrAe2zNn+lF/T5 1c7TjcGA0Vj6CIk0Dt3BlFwMbFYAjNELO8+ymkGg+mllrP9SwM/V0s78aSzHP6cU1nAj 8IlUtwHfvUg048e7DXO2D4P2KUnq1Kc3OOx1fy6HGCROimXo5HBk5bH5RrurUKT0YtNG E7lkmDDr1UhTgXCcAIWC3TbInoRk90+Mo6v+PRsCDTmcpDHbOCOIU0jmLYmxR60bHXyN Y8UQ== X-Gm-Message-State: AIkVDXKuVBI2uW0iZvu76kyW0F53GUwB5bVnVBU4gVMjV3ThW1OtZWwniri7PxuBJt5qNUb6 X-Received: by 10.98.66.138 with SMTP id h10mr16696551pfd.94.1486116734427; Fri, 03 Feb 2017 02:12:14 -0800 (PST) Received: from localhost.localdomain ([104.237.91.48]) by smtp.gmail.com with ESMTPSA id m29sm65598967pfi.54.2017.02.03.02.12.05 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 03 Feb 2017 02:12:13 -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 v7 3/3] thermal: zx2967: add thermal driver for ZTE's zx2967 family Date: Fri, 3 Feb 2017 18:10:55 +0800 Message-Id: <1486116655-24111-3-git-send-email-baoyou.xie@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1486116655-24111-1-git-send-email-baoyou.xie@linaro.org> References: <1486116655-24111-1-git-send-email-baoyou.xie@linaro.org> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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 | 281 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 290 insertions(+) create mode 100644 drivers/thermal/zx2967_thermal.c 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..fba55b1c --- /dev/null +++ b/drivers/thermal/zx2967_thermal.c @@ -0,0 +1,281 @@ +/* + * 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 +#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 0xfff +#define ZX2967_THERMAL_ID_MASK 0x18 +#define ZX2967_THERMAL_ID0 0x10 +#define ZX2967_THERMAL_ID1 0x8 + +#define ZX2967_GET_TEMP_TIMEOUT_US (100 * 1024) + +struct zx2967_thermal_sensor { + struct zx2967_thermal_priv *priv; + struct thermal_zone_device *tzd; + int id; +}; + +/* + * Now, one sensor remains in system, but in fact, we intend to support + * two sensors. + */ +#define NUM_SENSORS 1 + +struct zx2967_thermal_priv { + struct zx2967_thermal_sensor sensors[NUM_SENSORS]; + /* Prevents reads sensor in parallel */ + struct mutex lock; + struct clk *clk_gate; + struct clk *pclk; + void __iomem *regs; + struct device *dev; +}; + +#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->pclk) + clk_disable_unprepare(priv->pclk); + + if (priv && priv->clk_gate) + clk_disable_unprepare(priv->clk_gate); + + 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_gate); + if (error) + return error; + + error = clk_prepare_enable(priv->pclk); + if (error) { + clk_disable_unprepare(priv->clk_gate); + return error; + } + + return 0; +} +static SIMPLE_DEV_PM_OPS(zx2967_thermal_pm_ops, + zx2967_thermal_suspend, zx2967_thermal_resume); +#endif + +static int zx2967_thermal_get_temp(void *data, int *temp) +{ + void __iomem *regs; + struct zx2967_thermal_sensor *sensor = data; + struct zx2967_thermal_priv *priv = sensor->priv; + u32 val, sel_id; + int ret; + + if (!sensor->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; + sel_id = sensor->id ? ZX2967_THERMAL_ID1 : ZX2967_THERMAL_ID0; + val |= sel_id; + writel_relaxed(val, regs + ZX2967_THERMAL_SEL); + + 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 %d data timeout\n", + sensor->id); + mutex_unlock(&priv->lock); + return ret; + } + + 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, coefficients are multiplied by 1000. + */ + *temp = DIV_ROUND_CLOSEST(((s32)val + sensor->tzd->tzp->offset) * 1000, + sensor->tzd->tzp->slope); + + mutex_unlock(&priv->lock); + + return 0; +} + +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, i; + + 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_gate = devm_clk_get(&pdev->dev, "gate"); + if (IS_ERR(priv->clk_gate)) { + ret = PTR_ERR(priv->clk_gate); + dev_err(&pdev->dev, "failed to get clock gate: %d\n", ret); + return ret; + } + + ret = clk_prepare_enable(priv->clk_gate); + if (ret) { + dev_err(&pdev->dev, "failed to enable converter clock: %d\n", + ret); + return ret; + } + + priv->pclk = devm_clk_get(&pdev->dev, "pclk"); + if (IS_ERR(priv->pclk)) { + ret = PTR_ERR(priv->pclk); + dev_err(&pdev->dev, "failed to get apb clock: %d\n", ret); + goto disable_clk_gate; + } + + ret = clk_prepare_enable(priv->pclk); + if (ret) { + dev_err(&pdev->dev, "failed to enable converter clock: %d\n", + ret); + goto disable_clk_gate; + } + + mutex_init(&priv->lock); + for (i = 0; i < NUM_SENSORS; i++) { + struct zx2967_thermal_sensor *sensor = &priv->sensors[i]; + + sensor->priv = priv; + sensor->id = i; + sensor->tzd = thermal_zone_of_sensor_register(&pdev->dev, + i, sensor, &zx2967_of_thermal_ops); + + if (IS_ERR(sensor->tzd)) { + ret = PTR_ERR(sensor->tzd); + dev_err(&pdev->dev, "failed to register sensor %d: %d\n", + i, ret); + goto remove_ts; + } + + if (sensor->tzd->tzp->slope == 0) { + thermal_zone_of_sensor_unregister(&pdev->dev, + sensor->tzd); + dev_err(&pdev->dev, + "coefficients of sensor-%d is invalid\n", i); + ret = -EINVAL; + goto remove_ts; + } + } + priv->dev = &pdev->dev; + platform_set_drvdata(pdev, priv); + + return 0; + +remove_ts: + for (i--; i >= 0; i--) + thermal_zone_of_sensor_unregister(&pdev->dev, + priv->sensors[i].tzd); + clk_disable_unprepare(priv->pclk); +disable_clk_gate: + clk_disable_unprepare(priv->clk_gate); + + return ret; +} + +static int zx2967_thermal_exit(struct platform_device *pdev) +{ + struct zx2967_thermal_priv *priv = platform_get_drvdata(pdev); + int i; + + for (i = 0; i < NUM_SENSORS; i++) { + struct zx2967_thermal_sensor *sensor = &priv->sensors[i]; + + thermal_zone_of_sensor_unregister(&pdev->dev, sensor->tzd); + } + clk_disable_unprepare(priv->pclk); + clk_disable_unprepare(priv->clk_gate); + + return 0; +} + +static const struct of_device_id zx2967_thermal_id_table[] = { + { .compatible = "zte,zx296718-thermal" }, + {} +}; +MODULE_DEVICE_TABLE(of, zx2967_thermal_id_table); + +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, +#ifdef CONFIG_PM_SLEEP + .pm = &zx2967_thermal_pm_ops, +#endif + }, +}; +module_platform_driver(zx2967_thermal_driver); + +MODULE_AUTHOR("Baoyou Xie "); +MODULE_DESCRIPTION("ZTE zx2967 thermal driver"); +MODULE_LICENSE("GPL v2");