From patchwork Mon May 4 08:28:35 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Linus Walleij X-Patchwork-Id: 26833 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from yx-out-2122.google.com (yx-out-2122.google.com [74.125.44.24]) by bilbo.ozlabs.org (Postfix) with ESMTP id C338EB7069 for ; Mon, 4 May 2009 18:28:47 +1000 (EST) Received: by yx-out-2122.google.com with SMTP id 33so820728yxl.11 for ; Mon, 04 May 2009 01:28:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlegroups.com; s=beta; h=domainkey-signature:received:received:x-sender:x-apparently-to :received:received:received-spf:authentication-results:received :dkim-signature:domainkey-signature:mime-version:content-type :received:date:message-id:subject:from:to:cc:reply-to:sender :precedence:x-google-loop:mailing-list:list-id:list-post:list-help :list-unsubscribe:x-beenthere-env:x-beenthere; bh=YiZ7iHcSvZJj8SAKDHwW4Dy2PcU9Xdy8rCJuExXwj4s=; b=aOj+sRhV410qrcNixZkZygSKyWJot6S3eZsqiIcPGko5L4WvU96Nl9IVPxz4CzMmIh I7XQCRYDEzHpA6R6vXsdeDaCRnh+4HT4K+z1mwg9qPvJLTIJIOqs/bNPfq2Gd+kHlpxl 58e6y2q9R5/BYx9Qz6x0fEa20N5YTj17lT+Ao= DomainKey-Signature: a=rsa-sha1; c=nofws; d=googlegroups.com; s=beta; h=x-sender:x-apparently-to:received-spf:authentication-results :dkim-signature:domainkey-signature:mime-version:content-type:date :message-id:subject:from:to:cc:reply-to:sender:precedence :x-google-loop:mailing-list:list-id:list-post:list-help :list-unsubscribe:x-beenthere-env:x-beenthere; b=Te5HFLhV9urBn+QVI2U+El+2/WyG/xg7UIzWJA18hfCFq1ZYabyvQLRWpiVbxTh92E BiaPIyqpva9PpeUYqaIFk1dMgaw44ndJnMxdPFBoL+U3BXq+o+HnpvyPubW/OEk72x+m 3I0DdVHjeBIvuarXdjkPFOzRkI6Mq04sD2XcE= Received: by 10.100.131.13 with SMTP id e13mr579493and.6.1241425722083; Mon, 04 May 2009 01:28:42 -0700 (PDT) Received: by 10.107.131.11 with SMTP id i11gr2308prn.0; Mon, 04 May 2009 01:28:42 -0700 (PDT) X-Sender: linus.ml.walleij@gmail.com X-Apparently-To: rtc-linux@googlegroups.com Received: by 10.223.106.14 with SMTP id v14mr63063fao.28.1241425717350; Mon, 04 May 2009 01:28:37 -0700 (PDT) Received: from mail-fx0-f227.google.com (mail-fx0-f227.google.com [209.85.220.227]) by gmr-mx.google.com with ESMTP id 13si644971bwz.7.2009.05.04.01.28.36; Mon, 04 May 2009 01:28:36 -0700 (PDT) Received-SPF: pass (google.com: domain of linus.ml.walleij@gmail.com designates 209.85.220.227 as permitted sender) client-ip=209.85.220.227; Authentication-Results: gmr-mx.google.com; spf=pass (google.com: domain of linus.ml.walleij@gmail.com designates 209.85.220.227 as permitted sender) smtp.mail=linus.ml.walleij@gmail.com; dkim=pass (test mode) header.i=@gmail.com Received: by fxm27 with SMTP id 27so5707852fxm.30 for ; Mon, 04 May 2009 01:28:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:date:message-id:subject :from:to:cc:content-type:content-transfer-encoding; bh=cfQvnF5LP58k+7DgbiHpXziUqX8NSaMAmRCLXRAode0=; b=GK4DGTsweJ8MqPb/6oOSTsJQ54ASI7BODa3G5CbTUk8RmOo7t9XwISmbfpb6Co5Ko7 Pg5lOyYbgiEse7OsMPWpxGM+WoGAjAzmjP4B5XLkiYxcEpDMaGOx4yKIVR3PZVP4dxXi CkmauPOOqH9gz/a2pbJrNCP7urQvFDKEpgfBU= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:cc:content-type :content-transfer-encoding; b=Bae0KuGvFSHhS5Z10B55vCEhHSa7y/RbcbhiS7emXalM/4jg1xDaPRNS8e9nq7NJSF lPauaAInFDEHJR+JXPXyAHDoJLjJ0lzXc69WReeOkkMJQnWk9bnYJAAmuc8QvaPVTEuA 23AXqGtrsdYGlsapXdkoTZkwXmj3jhEuNirV4= Mime-Version: 1.0 Received: by 10.204.31.215 with SMTP id z23mr5496204bkc.83.1241425716019; Mon, 04 May 2009 01:28:36 -0700 (PDT) Date: Mon, 4 May 2009 10:28:35 +0200 Message-ID: <63386a3d0905040128u15159b15o16c9510f490652cc@mail.gmail.com> Subject: [rtc-linux] [PATCH] U300 COH 901 331 RTC driver From: Linus Walleij To: a.zummo@towertech.it Cc: linux-arm-kernel@lists.arm.linux.org.uk, rtc-linux@googlegroups.com Reply-To: rtc-linux@googlegroups.com Sender: rtc-linux@googlegroups.com Precedence: bulk X-Google-Loop: groups Mailing-List: list rtc-linux@googlegroups.com; contact rtc-linux+owner@googlegroups.com List-Id: List-Post: List-Help: List-Unsubscribe: , X-BeenThere-Env: rtc-linux@googlegroups.com X-BeenThere: rtc-linux@googlegroups.com This adds a driver for the RTC COH 901 331 found in the ST-Ericsson U300 series mobile platforms to the RTC subsystem. It integrates to the ARM kernel support recently added to RMKs ARM tree and will be enabled in the U300 defconfig in due time. Signed-off-by: Linus Walleij --- drivers/rtc/Kconfig | 12 ++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-coh901331.c | 346 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 359 insertions(+), 0 deletions(-) create mode 100644 drivers/rtc/rtc-coh901331.c diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 4e9851f..8262788 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -750,4 +750,16 @@ config RTC_DRV_PS3 This driver can also be built as a module. If so, the module will be called rtc-ps3. +config RTC_DRV_COH901331 + tristate "ST-Ericsson COH 901 331 RTC" + depends on ARCH_U300 + help + If you say Y here you will get access to ST-Ericsson + COH 901 331 RTC clock found in some ST-Ericsson Mobile + Platforms. + + This driver can also be built as a module. If so, the module + will be called "rtc-coh901331". + + endif # RTC_CLASS diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 6c0639a..4bb930b 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -77,3 +77,4 @@ obj-$(CONFIG_RTC_DRV_WM8350) += rtc-wm8350.o obj-$(CONFIG_RTC_DRV_X1205) += rtc-x1205.o obj-$(CONFIG_RTC_DRV_PCF50633) += rtc-pcf50633.o obj-$(CONFIG_RTC_DRV_PS3) += rtc-ps3.o +obj-$(CONFIG_RTC_DRV_COH901331) += rtc-coh901331.o diff --git a/drivers/rtc/rtc-coh901331.c b/drivers/rtc/rtc-coh901331.c new file mode 100644 index 0000000..160b0ab --- /dev/null +++ b/drivers/rtc/rtc-coh901331.c @@ -0,0 +1,346 @@ +/* + * + * drivers/rtc/rtc-coh901331.c + * + * + * Copyright (C) 2007-2009 ST-Ericsson AB + * License terms: GNU General Public License (GPL) version 2 + * Real Time Clock interface for ST-Ericsson AB COH 901 331 RTC. + * Author: Linus Walleij + * Based on rtc-pl031.c by Deepak Saxena + * Copyright 2006 (c) MontaVista Software, Inc. + */ +#include +#include +#include +#include +#include +#include +#include + +/* + * Registers in the COH 901 331 + */ +/* Alarm value 32bit (R/W) */ +#define COH901331_ALARM 0x00U +/* Used to set current time 32bit (R/W) */ +#define COH901331_SET_TIME 0x04U +/* Indication if current time is valid 32bit (R/-) */ +#define COH901331_VALID 0x08U +/* Read the current time 32bit (R/-) */ +#define COH901331_CUR_TIME 0x0cU +/* Event register for the "alarm" interrupt */ +#define COH901331_IRQ_EVENT 0x10U +/* Mask register for the "alarm" interrupt */ +#define COH901331_IRQ_MASK 0x14U +/* Force register for the "alarm" interrupt */ +#define COH901331_IRQ_FORCE 0x18U + +/* + * Reference to RTC block clock + * Notice that the frequent clk_enable()/clk_disable() on this + * clock is mainly to be able to turn on/off other clocks in the + * hierarchy as needed, the RTC clock is always on anyway. + */ +struct coh901331_port { + struct rtc_device *rtc; + struct clk *clk; + u32 phybase; + u32 physize; + void __iomem *virtbase; + int irq; +#ifdef CONFIG_PM + u32 irqmaskstore; +#endif +}; + +static irqreturn_t coh901331_interrupt(int irq, void *data) +{ + struct coh901331_port *rtap = data; + + clk_enable(rtap->clk); + /* Ack IRQ */ + writel(1, rtap->virtbase + COH901331_IRQ_EVENT); + clk_disable(rtap->clk); + /* Set alarm flag */ + rtc_update_irq(rtap->rtc, 1, RTC_AF); + + return IRQ_HANDLED; +} + +static int coh901331_open(struct device *dev) +{ + /* Not much to do here */ + return 0; +} + +static void coh901331_release(struct device *dev) +{ + /* Not much to do here */ +} + +static int coh901331_read_time(struct device *dev, struct rtc_time *tm) +{ + struct coh901331_port *rtap = dev_get_drvdata(dev); + + clk_enable(rtap->clk); + /* Check if the time is valid */ + if (readl(rtap->virtbase + COH901331_VALID)) { + rtc_time_to_tm(readl(rtap->virtbase + COH901331_CUR_TIME), tm); + clk_disable(rtap->clk); + return 0; + } + /* We couldn't read the time, set default value */ + writel(76550400, rtap->virtbase + COH901331_SET_TIME); + rtc_time_to_tm(76550400, tm); + clk_disable(rtap->clk); + return 0; +} + +static int coh901331_set_time(struct device *dev, struct rtc_time *tm) +{ + unsigned long time; + struct coh901331_port *rtap = dev_get_drvdata(dev); + + rtc_tm_to_time(tm, &time); + clk_enable(rtap->clk); + writel(time, rtap->virtbase + COH901331_SET_TIME); + clk_disable(rtap->clk); + + return 0; +} + +static int coh901331_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) +{ + struct coh901331_port *rtap = dev_get_drvdata(dev); + + clk_enable(rtap->clk); + rtc_time_to_tm(readl(rtap->virtbase + COH901331_ALARM), &alarm->time); + alarm->pending = readl(rtap->virtbase + COH901331_IRQ_EVENT) & 1U; + alarm->enabled = readl(rtap->virtbase + COH901331_IRQ_MASK) & 1U; + clk_disable(rtap->clk); + + return 0; +} + +static int coh901331_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) +{ + struct coh901331_port *rtap = dev_get_drvdata(dev); + unsigned long time; + + rtc_tm_to_time(&alarm->time, &time); + clk_enable(rtap->clk); + writel(time, rtap->virtbase + COH901331_ALARM); + writel(alarm->enabled, rtap->virtbase + COH901331_IRQ_MASK); + clk_disable(rtap->clk); + + return 0; +} + +static int coh901331_ioctl(struct device *dev, unsigned int cmd, + unsigned long arg) +{ + struct coh901331_port *rtap = dev_get_drvdata(dev); + + switch (cmd) { + case RTC_AIE_OFF: + clk_enable(rtap->clk); + writel(0, rtap->virtbase + COH901331_IRQ_MASK); + clk_disable(rtap->clk); + return 0; + case RTC_AIE_ON: + clk_enable(rtap->clk); + writel(1, rtap->virtbase + COH901331_IRQ_MASK); + clk_disable(rtap->clk); + return 0; + } + + return -ENOIOCTLCMD; +} + +static struct rtc_class_ops coh901331_ops = { + .open = coh901331_open, + .release = coh901331_release, + .ioctl = coh901331_ioctl, + .read_time = coh901331_read_time, + .set_time = coh901331_set_time, + .read_alarm = coh901331_read_alarm, + .set_alarm = coh901331_set_alarm, +}; + +static int __devexit coh901331_remove(struct platform_device *pdev) +{ + struct coh901331_port *rtap = dev_get_drvdata(&pdev->dev); + + if (rtap) { + platform_set_drvdata(pdev, NULL); + free_irq(rtap->irq, rtap); + rtc_device_unregister(rtap->rtc); + clk_put(rtap->clk); + iounmap(rtap->virtbase); + release_mem_region(rtap->phybase, rtap->physize); + kfree(rtap); + } + + return 0; +} + + +static int __devinit coh901331_probe(struct platform_device *pdev) +{ + int ret; + struct coh901331_port *rtap; + struct resource *res; + + + rtap = kzalloc(sizeof(struct coh901331_port), GFP_KERNEL); + if (!rtap) { + ret = -ENOMEM; + goto out; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + ret = -ENOMEM; + goto out_no_resource; + } + rtap->phybase = res->start; + rtap->physize = res->end - res->start; + + if (request_mem_region(rtap->phybase, rtap->physize, + "rtc-coh901331") == NULL) { + ret = -EBUSY; + goto out_no_memregion; + } + + + rtap->virtbase = ioremap(rtap->phybase, rtap->physize); + if (!rtap->virtbase) { + ret = -ENOMEM; + goto out_no_remap; + } + + rtap->irq = platform_get_irq(pdev, 0); + if (request_irq(rtap->irq, coh901331_interrupt, IRQF_DISABLED, + "RTC COH 901 331 Alarm", rtap)) { + ret = -EIO; + goto out_no_irq; + } + + rtap->clk = clk_get(&pdev->dev, "RTC"); + if (IS_ERR(rtap->clk)) { + ret = PTR_ERR(rtap->clk); + dev_err(&pdev->dev, "could not get clock\n"); + goto out_no_clk; + } + + /* We enable/disable the clock only to assure it works */ + ret = clk_enable(rtap->clk); + if (ret) { + dev_err(&pdev->dev, "could not enable clock\n"); + goto out_no_clk_enable; + } + clk_disable(rtap->clk); + + rtap->rtc = rtc_device_register("coh901331", &pdev->dev, &coh901331_ops, + THIS_MODULE); + if (IS_ERR(rtap->rtc)) { + ret = PTR_ERR(rtap->rtc); + goto out_no_rtc; + } + + platform_set_drvdata(pdev, rtap); + + return 0; + + out_no_rtc: + out_no_clk_enable: + clk_put(rtap->clk); + out_no_clk: + free_irq(rtap->irq, rtap); + out_no_irq: + iounmap(rtap->virtbase); + out_no_remap: + platform_set_drvdata(pdev, NULL); + out_no_memregion: + release_mem_region(rtap->phybase, SZ_4K); + out_no_resource: + kfree(rtap); + out: + return ret; +} + +#ifdef CONFIG_PM +static int coh901331_suspend(struct platform_device *pdev, pm_message_t state) +{ + struct coh901331_port *rtap = dev_get_drvdata(&pdev->dev); + + /* + * If this RTC alarm will be used for waking the system up, + * don't disable it of course. Else we just disable the alarm + * and await suspension. + */ + if (device_may_wakeup(&pdev->dev)) { + enable_irq_wake(rtap->irq); + } else { + clk_enable(rtap->clk); + rtap->irqmaskstore = readl(rtap->virtbase + COH901331_IRQ_MASK); + writel(0, rtap->virtbase + COH901331_IRQ_MASK); + clk_disable(rtap->clk); + } + return 0; +} + +static int coh901331_resume(struct platform_device *pdev) +{ + struct coh901331_port *rtap = dev_get_drvdata(&pdev->dev); + + if (device_may_wakeup(&pdev->dev)) + disable_irq_wake(rtap->irq); + else + clk_enable(rtap->clk); + writel(rtap->irqmaskstore, rtap->virtbase + COH901331_IRQ_MASK); + clk_disable(rtap->clk); + return 0; +} +#else +#define coh901331_suspend NULL +#define coh901331_resume NULL +#endif + +static void coh901331_shutdown(struct platform_device *pdev) +{ + struct coh901331_port *rtap = dev_get_drvdata(&pdev->dev); + + clk_enable(rtap->clk); + writel(0, rtap->virtbase + COH901331_IRQ_MASK); + clk_disable(rtap->clk); +} + +static struct platform_driver coh901331_driver = { + .driver = { + .name = "rtc-coh901331", + }, + .probe = coh901331_probe, + .remove = __devexit_p(coh901331_remove), + .suspend = coh901331_suspend, + .resume = coh901331_resume, + .shutdown = coh901331_shutdown, +}; + +static int __init coh901331_init(void) +{ + return platform_driver_register(&coh901331_driver); +} + +static void __exit coh901331_exit(void) +{ + platform_driver_unregister(&coh901331_driver); +} + +module_init(coh901331_init); +module_exit(coh901331_exit); + +MODULE_AUTHOR("Linus Walleij "); +MODULE_DESCRIPTION("ST-Ericsson AB COH 901 331 RTC Driver"); +MODULE_LICENSE("GPL");