From patchwork Mon May 29 09:15:42 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kunihiko Hayashi X-Patchwork-Id: 9753025 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 79A39602B1 for ; Mon, 29 May 2017 09:28:21 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6D29928448 for ; Mon, 29 May 2017 09:28:21 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 621BC28469; Mon, 29 May 2017 09:28:21 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable 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 A125428448 for ; Mon, 29 May 2017 09:28:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751069AbdE2J2T (ORCPT ); Mon, 29 May 2017 05:28:19 -0400 Received: from mx.socionext.com ([202.248.49.38]:16287 "EHLO mx.socionext.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750907AbdE2J2S (ORCPT ); Mon, 29 May 2017 05:28:18 -0400 Received: from unknown (HELO kinkan-ex.css.socionext.com) ([172.31.9.52]) by mx.socionext.com with ESMTP; 29 May 2017 18:16:59 +0900 Received: from mail.mfilter.local (unknown [10.213.24.62]) by kinkan-ex.css.socionext.com (Postfix) with ESMTP id 2E559180B47; Mon, 29 May 2017 18:16:59 +0900 (JST) Received: from 172.31.9.51 (172.31.9.51) by m-FILTER with ESMTP; Mon, 29 May 2017 18:16:59 +0900 Received: from plum.e01.socionext.com (unknown [10.213.132.32]) by kinkan.css.socionext.com (Postfix) with ESMTP id 9C1301A0E7B; Mon, 29 May 2017 18:16:58 +0900 (JST) From: Kunihiko Hayashi To: rui.zhang@intel.com, edubezval@gmail.com Cc: linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, robh+dt@kernel.org, mark.rutland@arm.com, devicetree@vger.kernel.org, yamada.masahiro@socionext.com, masami.hiramatsu@linaro.org, jaswinder.singh@linaro.org, Kunihiko Hayashi Subject: [PATCH 1/4] thermal: uniphier: add UniPhier thermal driver Date: Mon, 29 May 2017 18:15:42 +0900 Message-Id: <1496049345-14649-2-git-send-email-hayashi.kunihiko@socionext.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1496049345-14649-1-git-send-email-hayashi.kunihiko@socionext.com> References: <1496049345-14649-1-git-send-email-hayashi.kunihiko@socionext.com> 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 Add a thermal driver for on-chip PVT (Process, Voltage and Temperature) monitoring unit implemented on UniPhier SoCs. This driver supports temperature monitoring and alert function. Signed-off-by: Kunihiko Hayashi --- drivers/thermal/Kconfig | 8 + drivers/thermal/Makefile | 1 + drivers/thermal/uniphier_thermal.c | 390 +++++++++++++++++++++++++++++++++++++ 3 files changed, 399 insertions(+) create mode 100644 drivers/thermal/uniphier_thermal.c diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index 776b343..93ccf25 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -453,4 +453,12 @@ config ZX2967_THERMAL the primitive temperature sensor embedded in zx2967 SoCs. This sensor generates the real time die temperature. +config UNIPHIER_THERMAL + tristate "Socionext UniPhier thermal driver" + depends on ARCH_UNIPHIER || COMPILE_TEST + help + Enable this to support thermal reporting on UniPhier SoC. + This driver supports CPU thermal zone to reports the temperture + and trip points. + endif diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile index 7adae20..05b6e7c 100644 --- a/drivers/thermal/Makefile +++ b/drivers/thermal/Makefile @@ -58,3 +58,4 @@ 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_ZX2967_THERMAL) += zx2967_thermal.o +obj-$(CONFIG_UNIPHIER_THERMAL) += uniphier_thermal.o diff --git a/drivers/thermal/uniphier_thermal.c b/drivers/thermal/uniphier_thermal.c new file mode 100644 index 0000000..ae7e5ce --- /dev/null +++ b/drivers/thermal/uniphier_thermal.c @@ -0,0 +1,390 @@ +/** + * uniphier_thermal.c - Socionext UniPhier thermal driver + * + * Copyright 2014 Panasonic Corporation + * Copyright 2016 Socionext Inc. + * All rights reserved. + * + * Author: + * Kunihiko Hayashi + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 of + * the License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "thermal_core.h" + +/* + * block registers + * addresses are the offset from .block_base + */ +#define PVTCTLEN 0x0000 +#define PVTCTLEN_EN BIT(0) + +#define PVTCTLMODE 0x0004 +#define PVTCTLMODE_MASK 0xf +#define PVTCTLMODE_TEMPMON 0x5 + +#define EMONREPEAT 0x0040 +#define EMONREPEAT_ENDLESS BIT(24) +#define EMONREPEAT_PERIOD 0xf +#define EMONREPEAT_PERIOD_1000000 0x9 + +/* + * common registers + * addresses are the offset from .map_base + */ +#define PVTCTLSEL 0x0900 +#define PVTCTLSEL_MASK 0x7 +#define PVTCTLSEL_MONITOR 0 + +#define SETALERT0 0x0910 +#define SETALERT1 0x0914 +#define SETALERT2 0x0918 +#define SETALERT_TEMP_OVF (0xff << 16) +#define SETALERT_TEMP_OVF_VALUE(val) (((val) & 0xff) << 16) +#define SETALERT_EN BIT(0) + +#define PMALERTINTCTL 0x0920 +#define PMALERTINTCTL_CLR(ch) BIT(4 * (ch) + 2) +#define PMALERTINTCTL_SET(ch) BIT(4 * (ch) + 1) +#define PMALERTINTCTL_EN(ch) BIT(4 * (ch) + 0) +#define PMALERTINTCTL_MASK 0x777 + +#define TMOD 0x0928 +#define TMOD_MASK 0x1ff + +#define TMODCOEF 0x0e5c + +#define TMODSETUP0_EN BIT(30) +#define TMODSETUP0_VAL(val) (((val) & 0x3fff) << 16) +#define TMODSETUP1_EN BIT(15) +#define TMODSETUP1_VAL(val) ((val) & 0x7fff) + +/* SoC critical temperature is 95 degrees Celsius */ +#define CRITICAL_TEMP_LIMIT (95 * 1000) + +/* Max # of alert channels */ +#define ALERT_CH_NUM 3 + +/* SoC specific thermal sensor data */ +struct uniphier_tm_soc_data { + u32 map_base; + u32 block_base; + u32 tmod_setup_addr; +}; + +struct uniphier_tm_dev { + struct regmap *regmap; + bool alert_en[ALERT_CH_NUM]; + u32 tmod_calib0; + u32 tmod_calib1; + struct thermal_zone_device *tz_dev; + const struct uniphier_tm_soc_data *data; +}; + +static int uniphier_tm_initialize_sensor(struct uniphier_tm_dev *tdev) +{ + struct regmap *map = tdev->regmap; + u32 val; + int ret; + + /* stop PVT */ + regmap_write_bits(map, + tdev->data->block_base + PVTCTLEN, + PVTCTLEN_EN, 0); + + /* + * set default value if missing calibrated value + * + * Since SoC has a calibrated value that was set in advance, + * TMODCOEF shows non-zero and PVT refers the value internally. + * + * However, there is the case that some SoCs might not have the + * calibrated value. In that case, TMODCOEF shows zero and the driver + * has to set default value manually. + */ + ret = regmap_read(map, tdev->data->map_base + TMODCOEF, &val); + if (ret) + return ret; + if (!val) + regmap_write(map, + tdev->data->tmod_setup_addr, + TMODSETUP0_EN | + TMODSETUP0_VAL(tdev->tmod_calib0) | + TMODSETUP1_EN | + TMODSETUP1_VAL(tdev->tmod_calib1)); + + /* select temperature mode */ + regmap_write_bits(map, + tdev->data->block_base + PVTCTLMODE, + PVTCTLMODE_MASK, + PVTCTLMODE_TEMPMON); + + /* set monitoring period */ + regmap_write_bits(map, + tdev->data->block_base + EMONREPEAT, + EMONREPEAT_ENDLESS | + EMONREPEAT_PERIOD, + EMONREPEAT_ENDLESS | + EMONREPEAT_PERIOD_1000000); + + /* set monitor mode */ + regmap_write_bits(map, + tdev->data->map_base + PVTCTLSEL, + PVTCTLSEL_MASK, PVTCTLSEL_MONITOR); + + return 0; +} + +static void uniphier_tm_set_alert(struct uniphier_tm_dev *tdev, u32 ch, + u32 temp) +{ + struct regmap *map = tdev->regmap; + + /* set alert temperature */ + regmap_write_bits(map, + tdev->data->map_base + SETALERT0 + (ch << 2), + SETALERT_EN | + SETALERT_TEMP_OVF, + SETALERT_EN | + SETALERT_TEMP_OVF_VALUE(temp / 1000)); +} + +static void uniphier_tm_enable_sensor(struct uniphier_tm_dev *tdev) +{ + struct regmap *map = tdev->regmap; + int i; + u32 bits = 0; + + for (i = 0; i < ALERT_CH_NUM; i++) + if (tdev->alert_en[i]) + bits |= PMALERTINTCTL_EN(i); + + /* enable alert interrupt */ + regmap_write_bits(map, + tdev->data->map_base + PMALERTINTCTL, + PMALERTINTCTL_MASK, bits); + + /* start PVT */ + regmap_write_bits(map, + tdev->data->block_base + PVTCTLEN, + PVTCTLEN_EN, PVTCTLEN_EN); +} + +static void uniphier_tm_disable_sensor(struct uniphier_tm_dev *tdev) +{ + struct regmap *map = tdev->regmap; + + /* disable alert interrupt */ + regmap_write_bits(map, + tdev->data->map_base + PMALERTINTCTL, + PMALERTINTCTL_MASK, 0); + + /* stop PVT */ + regmap_write_bits(map, + tdev->data->block_base + PVTCTLEN, + PVTCTLEN_EN, 0); +} + +static int uniphier_tm_get_temp(void *data, int *out_temp) +{ + struct uniphier_tm_dev *tdev = data; + struct regmap *map = tdev->regmap; + int ret; + u32 temp; + + ret = regmap_read(map, tdev->data->map_base + TMOD, &temp); + if (ret) + return ret; + + temp &= TMOD_MASK; + *out_temp = temp * 1000; /* millicelsius */ + + return 0; +} + +static const struct thermal_zone_of_device_ops uniphier_of_thermal_ops = { + .get_temp = uniphier_tm_get_temp, +}; + +static void uniphier_tm_irq_clear(struct uniphier_tm_dev *tdev) +{ + u32 mask = 0, bits = 0; + int i; + + for (i = 0; i < ALERT_CH_NUM; i++) { + mask |= (PMALERTINTCTL_CLR(i) | + PMALERTINTCTL_SET(i)); + bits |= PMALERTINTCTL_CLR(i); + } + + /* clear alert interrupt */ + regmap_write_bits(tdev->regmap, + tdev->data->map_base + PMALERTINTCTL, mask, bits); +} + +static irqreturn_t uniphier_tm_alarm_handler(int irq, void *_tdev) +{ + struct uniphier_tm_dev *tdev = _tdev; + + uniphier_tm_irq_clear(tdev); + thermal_zone_device_update(tdev->tz_dev, THERMAL_EVENT_UNSPECIFIED); + + return IRQ_HANDLED; +} + +static int uniphier_tm_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct regmap *regmap; + struct device_node *parent; + struct uniphier_tm_dev *tdev; + const struct thermal_trip *trips; + const u32 *calib; + int i, ret, irq, ntrips, crit_temp = INT_MAX; + + tdev = devm_kzalloc(dev, sizeof(*tdev), GFP_KERNEL); + if (!tdev) + return -ENOMEM; + + tdev->data = of_device_get_match_data(dev); + if (WARN_ON(!tdev->data)) + return -EINVAL; + + /* get irq */ + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + /* get tmod-calibration values */ + calib = of_get_property(dev->of_node, "socionext,tmod-calibration", + NULL); + if (calib) { + tdev->tmod_calib0 = of_read_number(calib, 1); + tdev->tmod_calib1 = of_read_number(calib + 1, 1); + } + + /* get regmap from syscon node */ + parent = of_get_parent(dev->of_node); /* parent should be syscon node */ + regmap = syscon_node_to_regmap(parent); + of_node_put(parent); + if (IS_ERR(regmap)) { + dev_err(dev, "failed to get regmap (error %ld)\n", + PTR_ERR(regmap)); + return PTR_ERR(regmap); + } + tdev->regmap = regmap; + + /* register sensor */ + tdev->tz_dev = devm_thermal_zone_of_sensor_register(dev, 0, tdev, + &uniphier_of_thermal_ops); + if (IS_ERR(tdev->tz_dev)) { + dev_err(dev, "failed to register sensor device\n"); + return PTR_ERR(tdev->tz_dev); + } + + /* get trip points */ + trips = of_thermal_get_trip_points(tdev->tz_dev); + ntrips = of_thermal_get_ntrips(tdev->tz_dev); + if (ntrips > ALERT_CH_NUM) { + dev_err(dev, "thermal zone has too many trips\n"); + return -E2BIG; + } + + /* initialize sensor */ + ret = uniphier_tm_initialize_sensor(tdev); + if (ret) { + dev_err(dev, "failed to initialize sensor\n"); + return ret; + } + for (i = 0; i < ntrips; i++) { + if (trips[i].type == THERMAL_TRIP_CRITICAL && + trips[i].temperature < crit_temp) + crit_temp = trips[i].temperature; + uniphier_tm_set_alert(tdev, i, trips[i].temperature); + tdev->alert_en[i] = true; + } + if (crit_temp > CRITICAL_TEMP_LIMIT) { + dev_err(dev, "critical trip is over limit(>%d), or not set\n", + CRITICAL_TEMP_LIMIT); + return -EINVAL; + } + + ret = devm_request_irq(dev, irq, uniphier_tm_alarm_handler, + 0, "thermal", tdev); + if (ret) + return ret; + + /* enable sensor */ + uniphier_tm_enable_sensor(tdev); + + platform_set_drvdata(pdev, tdev); + + return 0; +} + +static int uniphier_tm_remove(struct platform_device *pdev) +{ + struct uniphier_tm_dev *tdev = platform_get_drvdata(pdev); + + /* disable sensor */ + uniphier_tm_disable_sensor(tdev); + + return 0; +} + +static const struct uniphier_tm_soc_data uniphier_pxs2_tm_data = { + .map_base = 0xe000, + .block_base = 0xe000, + .tmod_setup_addr = 0xe904, +}; + +static const struct uniphier_tm_soc_data uniphier_ld20_tm_data = { + .map_base = 0xe000, + .block_base = 0xe800, + .tmod_setup_addr = 0xe938, +}; + +static const struct of_device_id uniphier_tm_dt_ids[] = { + { + .compatible = "socionext,uniphier-pxs2-thermal", + .data = &uniphier_pxs2_tm_data, + }, + { + .compatible = "socionext,uniphier-ld20-thermal", + .data = &uniphier_ld20_tm_data, + }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, uniphier_tm_dt_ids); + +static struct platform_driver uniphier_tm_driver = { + .probe = uniphier_tm_probe, + .remove = uniphier_tm_remove, + .driver = { + .name = "uniphier-thermal", + .of_match_table = uniphier_tm_dt_ids, + }, +}; +module_platform_driver(uniphier_tm_driver); + +MODULE_AUTHOR("Kunihiko Hayashi "); +MODULE_DESCRIPTION("UniPhier thermal driver"); +MODULE_LICENSE("GPL v2");