From patchwork Thu Jul 26 06:35:19 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Venu Byravarasu X-Patchwork-Id: 173344 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from mail-pb0-f56.google.com (mail-pb0-f56.google.com [209.85.160.56]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority" (not verified)) by ozlabs.org (Postfix) with ESMTPS id D86FC2C007A for ; Thu, 26 Jul 2012 16:40:04 +1000 (EST) Received: by pbbro12 with SMTP id ro12sf1790206pbb.11 for ; Wed, 25 Jul 2012 23:40:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlegroups.com; s=beta; h=x-beenthere:received-spf:x-pgp-universal:from:to:cc:subject:date :message-id:x-mailer:x-nvconfidentiality:mime-version :x-original-sender:x-original-authentication-results:reply-to :precedence:mailing-list:list-id:x-google-group-id:list-post :list-help:list-archive:sender:list-subscribe:list-unsubscribe :content-type; bh=ZpZrPbNynnh8dGsF2UmjypGW/+t47b07endXW5vsv0c=; b=ZbUx7XhXl8303A5NI0qIePGIu+LFrIF+QtELYTzt5knInUIfASwJErVwEJHToRs/vq LPIy6aTLCrPoaWeNgr+wC77Dw/JHVgFbncwvLiPnxVerT9BV082YRX5huMWxDEeTsLuT kmIKmN44EPa6Y3RUUTPI075YNZzml+iz7/+rQ= Received: by 10.68.202.36 with SMTP id kf4mr82490pbc.10.1343284802572; Wed, 25 Jul 2012 23:40:02 -0700 (PDT) X-BeenThere: rtc-linux@googlegroups.com Received: by 10.68.227.136 with SMTP id sa8ls5424099pbc.8.gmail; Wed, 25 Jul 2012 23:40:02 -0700 (PDT) Received: by 10.66.74.41 with SMTP id q9mr1458208pav.41.1343284802141; Wed, 25 Jul 2012 23:40:02 -0700 (PDT) Received: by 10.66.74.41 with SMTP id q9mr1458206pav.41.1343284802021; Wed, 25 Jul 2012 23:40:02 -0700 (PDT) Received: from hqemgate04.nvidia.com (hqemgate04.nvidia.com. [216.228.121.35]) by gmr-mx.google.com with ESMTPS id oh7si1323160pbb.2.2012.07.25.23.40.01 (version=TLSv1/SSLv3 cipher=OTHER); Wed, 25 Jul 2012 23:40:02 -0700 (PDT) Received-SPF: pass (google.com: domain of vbyravarasu@nvidia.com designates 216.228.121.35 as permitted sender) client-ip=216.228.121.35; Received: from hqnvupgp06.nvidia.com (Not Verified[216.228.121.13]) by hqemgate04.nvidia.com id ; Wed, 25 Jul 2012 23:38:37 -0700 Received: from hqemhub01.nvidia.com ([172.17.108.22]) by hqnvupgp06.nvidia.com (PGP Universal service); Wed, 25 Jul 2012 23:39:19 -0700 X-PGP-Universal: processed; by hqnvupgp06.nvidia.com on Wed, 25 Jul 2012 23:39:19 -0700 Received: from localhost.localdomain (172.20.144.16) by hqemhub01.nvidia.com (172.20.150.30) with Microsoft SMTP Server (TLS) id 8.3.264.0; Wed, 25 Jul 2012 23:39:17 -0700 From: Venu Byravarasu To: , , , , CC: , , Venu Byravarasu Subject: [rtc-linux] [PATCH] rtc: tps65910: Add RTC driver for TPS65910 PMIC RTC Date: Thu, 26 Jul 2012 12:05:19 +0530 Message-ID: <1343284519-30505-1-git-send-email-vbyravarasu@nvidia.com> X-Mailer: git-send-email 1.7.1.1 X-NVConfidentiality: public MIME-Version: 1.0 X-Original-Sender: vbyravarasu@nvidia.com X-Original-Authentication-Results: gmr-mx.google.com; spf=pass (google.com: domain of vbyravarasu@nvidia.com designates 216.228.121.35 as permitted sender) smtp.mail=vbyravarasu@nvidia.com Reply-To: rtc-linux@googlegroups.com Precedence: list Mailing-list: list rtc-linux@googlegroups.com; contact rtc-linux+owners@googlegroups.com List-ID: X-Google-Group-Id: 712029733259 List-Post: , List-Help: , List-Archive: Sender: rtc-linux@googlegroups.com List-Subscribe: , List-Unsubscribe: , TPS65910 PMIC is a MFD with RTC as one of the device. Adding RTC driver for supporting RTC device present inside TPS65910 PMIC. Only support for RTC alarm is implemented as part of this patch. Signed-off-by: Venu Byravarasu Acked-by: Samuel Ortiz --- drivers/rtc/Kconfig | 10 ++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-tps65910.c | 353 ++++++++++++++++++++++++++++++++++++++++++ include/linux/mfd/tps65910.h | 10 ++ 4 files changed, 374 insertions(+), 0 deletions(-) create mode 100644 drivers/rtc/rtc-tps65910.c diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 668da59..82abc6c 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -323,6 +323,16 @@ config RTC_DRV_TWL4030 This driver can also be built as a module. If so, the module will be called rtc-twl. +config RTC_DRV_TPS65910 + tristate "TI TPS65910 RTC driver" + depends on RTC_CLASS && MFD_TPS65910 + help + If you say yes here you get support for the RTC on the + TPS65910 chips. + + This driver can also be built as a module. If so, the module + will be called rtc-tps65910. + config RTC_DRV_S35390A tristate "Seiko Instruments S-35390A" select BITREVERSE diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 2973921..9bd5620 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -104,6 +104,7 @@ obj-$(CONFIG_RTC_DRV_TEGRA) += rtc-tegra.o obj-$(CONFIG_RTC_DRV_TEST) += rtc-test.o obj-$(CONFIG_RTC_DRV_TILE) += rtc-tile.o obj-$(CONFIG_RTC_DRV_TWL4030) += rtc-twl.o +obj-$(CONFIG_RTC_DRV_TPS65910) += rtc-tps65910.o obj-$(CONFIG_RTC_DRV_TX4939) += rtc-tx4939.o obj-$(CONFIG_RTC_DRV_V3020) += rtc-v3020.o obj-$(CONFIG_RTC_DRV_VR41XX) += rtc-vr41xx.o diff --git a/drivers/rtc/rtc-tps65910.c b/drivers/rtc/rtc-tps65910.c new file mode 100644 index 0000000..74c43c7 --- /dev/null +++ b/drivers/rtc/rtc-tps65910.c @@ -0,0 +1,353 @@ +/* + * rtc-tps65910.c -- TPS65910 Real Time Clock interface + * + * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. + * Author: Venu Byravarasu + * + * Based on original TI driver rtc-twl.c + * Copyright (C) 2007 MontaVista Software, Inc + * Author: Alexandre Rusev + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct tps65910_rtc { + struct rtc_device *rtc; + /* To store the list of enabled interrupts */ + u32 irqstat; +}; + +/* Total number of RTC registers needed to set time*/ +#define NUM_TIME_REGS (TPS65910_YEARS - TPS65910_SECONDS + 1) + +static int tps65910_rtc_alarm_irq_enable(struct device *dev, unsigned enabled) +{ + struct tps65910 *tps = dev_get_drvdata(dev->parent); + u8 val = 0; + + if (enabled) + val = TPS65910_RTC_INTERRUPTS_IT_ALARM; + + return regmap_write(tps->regmap, TPS65910_RTC_INTERRUPTS, val); +} + +/* + * Gets current tps65910 RTC time and date parameters. + * + * The RTC's time/alarm representation is not what gmtime(3) requires + * Linux to use: + * + * - Months are 1..12 vs Linux 0-11 + * - Years are 0..99 vs Linux 1900..N (we assume 21st century) + */ +static int tps65910_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + unsigned char rtc_data[NUM_TIME_REGS]; + struct tps65910 *tps = dev_get_drvdata(dev->parent); + int ret; + + /* Copy RTC counting registers to static registers or latches */ + ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL, + TPS65910_RTC_CTRL_GET_TIME, TPS65910_RTC_CTRL_GET_TIME); + if (ret < 0) { + dev_err(dev, "RTC CTRL reg update failed with err:%d\n", ret); + return ret; + } + + ret = regmap_bulk_read(tps->regmap, TPS65910_SECONDS, rtc_data, + NUM_TIME_REGS); + if (ret < 0) { + dev_err(dev, "reading from RTC failed with err:%d\n", ret); + return ret; + } + + tm->tm_sec = bcd2bin(rtc_data[0]); + tm->tm_min = bcd2bin(rtc_data[1]); + tm->tm_hour = bcd2bin(rtc_data[2]); + tm->tm_mday = bcd2bin(rtc_data[3]); + tm->tm_mon = bcd2bin(rtc_data[4]) - 1; + tm->tm_year = bcd2bin(rtc_data[5]) + 100; + + return ret; +} + +static int tps65910_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + unsigned char rtc_data[NUM_TIME_REGS]; + struct tps65910 *tps = dev_get_drvdata(dev->parent); + int ret; + + rtc_data[0] = bin2bcd(tm->tm_sec); + rtc_data[1] = bin2bcd(tm->tm_min); + rtc_data[2] = bin2bcd(tm->tm_hour); + rtc_data[3] = bin2bcd(tm->tm_mday); + rtc_data[4] = bin2bcd(tm->tm_mon + 1); + rtc_data[5] = bin2bcd(tm->tm_year - 100); + + /* Stop RTC while updating the RTC time registers */ + ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL, + TPS65910_RTC_CTRL_STOP_RTC, 0); + if (ret < 0) { + dev_err(dev, "RTC stop failed with err:%d\n", ret); + return ret; + } + + /* update all the time registers in one shot */ + ret = regmap_bulk_write(tps->regmap, TPS65910_SECONDS, rtc_data, + NUM_TIME_REGS); + if (ret < 0) { + dev_err(dev, "rtc_set_time error %d\n", ret); + return ret; + } + + /* Start back RTC */ + ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL, + TPS65910_RTC_CTRL_STOP_RTC, 1); + if (ret < 0) + dev_err(dev, "RTC start failed with err:%d\n", ret); + + return ret; +} + +/* + * Gets current tps65910 RTC alarm time. + */ +static int tps65910_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm) +{ + unsigned char alarm_data[NUM_TIME_REGS]; + u32 int_val; + struct tps65910 *tps = dev_get_drvdata(dev->parent); + int ret; + + ret = regmap_bulk_read(tps->regmap, TPS65910_SECONDS, alarm_data, + NUM_TIME_REGS); + if (ret < 0) { + dev_err(dev, "rtc_read_alarm error %d\n", ret); + return ret; + } + + alm->time.tm_sec = bcd2bin(alarm_data[0]); + alm->time.tm_min = bcd2bin(alarm_data[1]); + alm->time.tm_hour = bcd2bin(alarm_data[2]); + alm->time.tm_mday = bcd2bin(alarm_data[3]); + alm->time.tm_mon = bcd2bin(alarm_data[4]) - 1; + alm->time.tm_year = bcd2bin(alarm_data[5]) + 100; + + ret = regmap_read(tps->regmap, TPS65910_RTC_INTERRUPTS, &int_val); + if (ret < 0) + return ret; + + if (int_val & TPS65910_RTC_INTERRUPTS_IT_ALARM) + alm->enabled = 1; + + return ret; +} + +static int tps65910_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm) +{ + unsigned char alarm_data[NUM_TIME_REGS]; + struct tps65910 *tps = dev_get_drvdata(dev->parent); + int ret; + + ret = tps65910_rtc_alarm_irq_enable(dev, 0); + if (ret) + return ret; + + alarm_data[0] = bin2bcd(alm->time.tm_sec); + alarm_data[1] = bin2bcd(alm->time.tm_min); + alarm_data[2] = bin2bcd(alm->time.tm_hour); + alarm_data[3] = bin2bcd(alm->time.tm_mday); + alarm_data[4] = bin2bcd(alm->time.tm_mon + 1); + alarm_data[5] = bin2bcd(alm->time.tm_year - 100); + + /* update all the alarm registers in one shot */ + ret = regmap_bulk_write(tps->regmap, TPS65910_ALARM_SECONDS, + alarm_data, NUM_TIME_REGS); + if (ret) { + dev_err(dev, "rtc_set_alarm error %d\n", ret); + return ret; + } + + if (alm->enabled) + ret = tps65910_rtc_alarm_irq_enable(dev, 1); + + return ret; +} + +static irqreturn_t tps65910_rtc_interrupt(int irq, void *rtc) +{ + struct device *dev = rtc; + unsigned long events = 0; + struct tps65910 *tps = dev_get_drvdata(dev->parent); + struct tps65910_rtc *tps_rtc = dev_get_drvdata(dev); + int ret; + u32 rtc_reg; + + ret = regmap_read(tps->regmap, TPS65910_RTC_STATUS, &rtc_reg); + if (ret) + return IRQ_NONE; + + if (rtc_reg & TPS65910_RTC_STATUS_ALARM) + events = RTC_IRQF | RTC_AF; + + ret = regmap_write(tps->regmap, TPS65910_RTC_STATUS, rtc_reg); + if (ret) + return IRQ_NONE; + + /* Notify RTC core on event */ + rtc_update_irq(tps_rtc->rtc, 1, events); + + return IRQ_HANDLED; +} + +static struct rtc_class_ops tps65910_rtc_ops = { + .read_time = tps65910_rtc_read_time, + .set_time = tps65910_rtc_set_time, + .read_alarm = tps65910_rtc_read_alarm, + .set_alarm = tps65910_rtc_set_alarm, + .alarm_irq_enable = tps65910_rtc_alarm_irq_enable, +}; + +static int __devinit tps65910_rtc_probe(struct platform_device *pdev) +{ + struct tps65910 *tps65910 = NULL; + struct tps65910_rtc *tps_rtc = NULL; + struct tps65910_board *pmic_plat_data; + int ret = -EINVAL; + int irq = 0; + u32 rtc_reg; + + tps65910 = dev_get_drvdata(pdev->dev.parent); + + tps_rtc = devm_kzalloc(&pdev->dev, sizeof(struct tps65910_rtc), + GFP_KERNEL); + if (!tps_rtc) + return -ENOMEM; + + /* Clear pending interrupts */ + ret = regmap_read(tps65910->regmap, TPS65910_RTC_STATUS, &rtc_reg); + if (ret < 0) + return ret; + + ret = regmap_write(tps65910->regmap, TPS65910_RTC_STATUS, rtc_reg); + if (ret < 0) + return ret; + + dev_dbg(&pdev->dev, "Enabling tps65910-RTC.\n"); + rtc_reg = TPS65910_RTC_CTRL_STOP_RTC; + ret = regmap_write(tps65910->regmap, TPS65910_RTC_CTRL, rtc_reg); + if (ret < 0) + return ret; + + pmic_plat_data = dev_get_platdata(tps65910->dev); + irq = pmic_plat_data->irq_base; + if (irq <= 0) { + dev_warn(&pdev->dev, "Wake up is not possible as irq = %d\n", + irq); + return ret; + } + + irq += TPS65910_IRQ_RTC_ALARM; + ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, + tps65910_rtc_interrupt, IRQF_TRIGGER_LOW, + dev_name(&tps_rtc->rtc->dev), &pdev->dev); + if (ret < 0) { + dev_err(&pdev->dev, "IRQ is not free.\n"); + return ret; + } + device_init_wakeup(&pdev->dev, 1); + + tps_rtc->rtc = rtc_device_register(pdev->name, &pdev->dev, + &tps65910_rtc_ops, THIS_MODULE); + if (IS_ERR(tps_rtc->rtc)) { + ret = PTR_ERR(tps_rtc->rtc); + dev_err(&pdev->dev, "RTC device register: err %d\n", ret); + return ret; + } + + platform_set_drvdata(pdev, tps_rtc); + + return 0; +} + +/* + * Disable all tps65910 RTC module interrupts. + * Sets status flag to free. + */ +static int __devexit tps65910_rtc_remove(struct platform_device *pdev) +{ + /* leave rtc running, but disable irqs */ + struct rtc_device *rtc = platform_get_drvdata(pdev); + + tps65910_rtc_alarm_irq_enable(&rtc->dev, 0); + + rtc_device_unregister(rtc); + return 0; +} + +#ifdef CONFIG_PM_SLEEP + +static int tps65910_rtc_suspend(struct platform_device *pdev, + pm_message_t state) +{ + struct tps65910 *tps = dev_get_drvdata(pdev->dev.parent); + u8 alarm = TPS65910_RTC_INTERRUPTS_IT_ALARM; + int ret; + + /* Store current list of enabled interrupts*/ + ret = regmap_read(tps->regmap, TPS65910_RTC_INTERRUPTS, + &tps->rtc.irqstat); + if (ret < 0) + return ret; + + /* Enable RTC ALARM interrupt only */ + return regmap_write(tps->regmap, TPS65910_RTC_INTERRUPTS, alarm); +} + +static int tps65910_rtc_resume(struct platform_device *pdev) +{ + struct tps65910 *tps = dev_get_drvdata(pdev->dev.parent); + + /* Restore list of enabled interrupts before suspend */ + return regmap_write(tps->regmap, TPS65910_RTC_INTERRUPTS, + tps->rtc.irqstat); +} + +static const struct dev_pm_ops tps65910_rtc_pm_ops = { + .suspend = tps65910_rtc_suspend, + .resume = tps65910_rtc_resume, +}; + +#define DEV_PM_OPS (&tps65910_rtc_pm_ops) +#else +#define DEV_PM_OPS NULL +#endif + +static struct platform_driver tps65910rtc_driver = { + .probe = tps65910_rtc_probe, + .remove = __devexit_p(tps65910_rtc_remove), + .driver = { + .owner = THIS_MODULE, + .name = "tps65910-rtc", + .pm = DEV_PM_OPS, + }, +}; + +module_platform_driver(tps65910rtc_driver); +MODULE_ALIAS("platform:tps65910_rtc"); +MODULE_AUTHOR("Venu Byravarasu "); +MODULE_LICENSE("GPL"); diff --git a/include/linux/mfd/tps65910.h b/include/linux/mfd/tps65910.h index dd8dc0a..8ab0ab3 100644 --- a/include/linux/mfd/tps65910.h +++ b/include/linux/mfd/tps65910.h @@ -132,6 +132,16 @@ * */ +/* RTC_CTRL_REG bitfields */ +#define TPS65910_RTC_CTRL_STOP_RTC 0x01 /*0=stop, 1=run */ +#define TPS65910_RTC_CTRL_GET_TIME 0x40 + +/* RTC_STATUS_REG bitfields */ +#define TPS65910_RTC_STATUS_ALARM 0x40 + +/* RTC_INTERRUPTS_REG bitfields */ +#define TPS65910_RTC_INTERRUPTS_EVERY 0x03 +#define TPS65910_RTC_INTERRUPTS_IT_ALARM 0x08 /*Register BCK1 (0x80) register.RegisterDescription */ #define BCK1_BCKUP_MASK 0xFF