From patchwork Wed Jan 18 04:42:02 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Baoyou Xie X-Patchwork-Id: 9522591 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 7EC03601B7 for ; Wed, 18 Jan 2017 04:43:54 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 75D6A28532 for ; Wed, 18 Jan 2017 04:43:54 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 695D3285A6; Wed, 18 Jan 2017 04:43:54 +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=-6.3 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI, RCVD_IN_SORBS_SPAM, 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 9713428532 for ; Wed, 18 Jan 2017 04:43:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751342AbdAREnu (ORCPT ); Tue, 17 Jan 2017 23:43:50 -0500 Received: from mail-pf0-f180.google.com ([209.85.192.180]:34928 "EHLO mail-pf0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751070AbdAREnp (ORCPT ); Tue, 17 Jan 2017 23:43:45 -0500 Received: by mail-pf0-f180.google.com with SMTP id f144so918318pfa.2 for ; Tue, 17 Jan 2017 20:42:47 -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=DOVrZ4frlloRWUEUgii7yiCXnco0Wue4icaT4afCZoI=; b=D1MBh4A7M1EXU/FW6Y3ARYIM+uc1BGEvK81+KOq5W1isXL67+9lerz0cU6ahnGjhmN +VF8b6fXkmLmVl8NRt+G1ppLi3y+26dmN1hrPNAAdSsxOrn/yZ7w0GSXOYw1H2+Bnauf Z+fnBYVUlE+q6xZuTDFp09y42l5uucixvU1F4= 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=DOVrZ4frlloRWUEUgii7yiCXnco0Wue4icaT4afCZoI=; b=okOjSOF0fbKDlZw6rX8RpEDKRkOhaSwTAtemSaSv/LLwWfaNgmkWHLz/lwsT/rf/ci 5bkr2ciGw77Zu/xEG6LUxM7Y7Qk61T3aXqhbmmm7GmMgty8JQOg+CPHv1ptZmPjH0z6W ar7XcZlYMJ7lSmUxEA+VpiG5SnUMQeRGvWiWLgZw5A4Kmp83aOxlNOm31iWsqMEJ3X2Y hjtnY1g6wIvxNQ5USZkTqZedw6fp1G93GV2Fu+IXAvCTV/jt+FCgHcsKJZV/AC+f39Jp TqgUqmHe4KO+6o5yh/DEe/IXF4N9PijXOE8irt4JTiAuS9PO2qpmZozdW088aDJH9H7q /BXA== X-Gm-Message-State: AIkVDXKTZSs884pSypR2nZoTMZMlV4nrXVvmKcjwAfpTrH2X8xjDGXKn2iZx3dQaFFzZr/3q X-Received: by 10.99.97.196 with SMTP id v187mr1625067pgb.175.1484714566737; Tue, 17 Jan 2017 20:42:46 -0800 (PST) Received: from localhost.localdomain ([104.237.91.121]) by smtp.gmail.com with ESMTPSA id p26sm32559197pfj.23.2017.01.17.20.42.35 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 17 Jan 2017 20:42:46 -0800 (PST) From: Baoyou Xie To: 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 v5 3/3] thermal: zx2967: add thermal driver for ZTE's zx2967 family Date: Wed, 18 Jan 2017 12:42:02 +0800 Message-Id: <1484714522-26651-3-git-send-email-baoyou.xie@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1484714522-26651-1-git-send-email-baoyou.xie@linaro.org> References: <1484714522-26651-1-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 | 256 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 265 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..1f08c33 --- /dev/null +++ b/drivers/thermal/zx2967_thermal.c @@ -0,0 +1,256 @@ +/* + * 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 + +/* DCF Control Register */ +#define ZX2967_THERMAL_DCF 0x4 + +/* Selection Register */ +#define ZX2967_THERMAL_SEL 0x8 + +/* Control Register */ +#define ZX2967_THERMAL_CTRL 0x10 + +#define ZX2967_THERMAL_READY 0x1000 +#define ZX2967_THERMAL_TEMP_MASK 0xfff +#define ZX2967_THERMAL_ID_MASK 0x18 +#define ZX2967_THERMAL_ID0 0x8 +#define ZX2967_THERMAL_ID1 0x10 + +struct zx2967_thermal_sensor { + struct zx2967_thermal_priv *priv; + struct thermal_zone_device *tzd; + int id; +}; + +#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; +}; + +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 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; + unsigned long timeout = jiffies + msecs_to_jiffies(100); + u32 val, sel_id; + + regs = priv->regs; + mutex_lock(&priv->lock); + + writel_relaxed(0, regs + ZX2967_THERMAL_POWER_MODE); + writel_relaxed(2, regs + ZX2967_THERMAL_DCF); + + val = readl_relaxed(regs + ZX2967_THERMAL_SEL); + val &= ~ZX2967_THERMAL_ID_MASK; + sel_id = sensor->id ? ZX2967_THERMAL_ID0 : ZX2967_THERMAL_ID1; + val |= sel_id; + writel_relaxed(val, regs + ZX2967_THERMAL_SEL); + + usleep_range(100, 300); + val = readl_relaxed(regs + ZX2967_THERMAL_CTRL); + while (!(val & ZX2967_THERMAL_READY)) { + if (time_after(jiffies, timeout)) { + dev_err(priv->dev, "Thermal sensor %d data timeout\n", + sensor->id); + mutex_unlock(&priv->lock); + return -ETIMEDOUT; + } + usleep_range(100, 300); + val = readl_relaxed(regs + ZX2967_THERMAL_CTRL); + } + + writel_relaxed(3, regs + ZX2967_THERMAL_DCF); + val = readl_relaxed(regs + ZX2967_THERMAL_CTRL) + & ZX2967_THERMAL_TEMP_MASK; + writel_relaxed(1, regs + ZX2967_THERMAL_POWER_MODE); + + /* + * Calculate temperature + * 922 initial value of calibration cure + * 1.951 slope of calibration cure + */ + *temp = DIV_ROUND_CLOSEST((val - 922) * 1000, 1951); + + 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); + clk_disable_unprepare(priv->clk_gate); + dev_err(&pdev->dev, "failed to get apb clock: %d\n", ret); + return ret; + } + + ret = clk_prepare_enable(priv->pclk); + if (ret) { + clk_disable_unprepare(priv->clk_gate); + dev_err(&pdev->dev, "failed to enable converter clock: %d\n", + ret); + return ret; + } + + 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; + } + } + priv->dev = &pdev->dev; + platform_set_drvdata(pdev, priv); + + return 0; + +remove_ts: + clk_disable_unprepare(priv->clk_gate); + clk_disable_unprepare(priv->pclk); + for (i--; i >= 0; i--) + thermal_zone_of_sensor_unregister(&pdev->dev, + priv->sensors[i].tzd); + + 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 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");