From patchwork Wed May 13 22:14:54 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Linus Walleij X-Patchwork-Id: 27168 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from mail-qy0-f150.google.com (mail-qy0-f150.google.com [209.85.221.150]) by bilbo.ozlabs.org (Postfix) with ESMTP id 21AE3B707D for ; Thu, 14 May 2009 08:15:02 +1000 (EST) Received: by qyk14 with SMTP id 14so68350qyk.29 for ; Wed, 13 May 2009 15:15:00 -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=OCTHlkIe92Nq4JccqlBGAPwcETvkEseDmOvYZ+LGT3I=; b=DHhfv06/Gh5HdJ0OFihwwsYMphofi19pVXWe8gFMoLcBuRrpOktJh1rWWz35StYkXF 0WSvMOHRp5VvZLD3BIxB6qS0ZF66Kyv1zIEBBVsOxILGVgQIUsY5joF1WIxGPjUlb2Ij HYkglxQhVxDvevzBOfIeMWXLSxnrRKFG/h/wg= 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=rxgN2zHlTCLVf8BTjzOK1B6sAvkNMF0F5e5rW+QZ7AMcvaCRenNNeBvwkVPmYEIzYj TYPqeKqiPnq1Os04QAkHuVM9tXWJRtHCZ2nr+Zs66vSpmmf2Ysrko20Kb8mxWKpn8bbG I1Fdos+6rZFyI+eii+cTp0lghYMX7ceaIU3CY= Received: by 10.229.85.2 with SMTP id m2mr177342qcl.20.1242252897129; Wed, 13 May 2009 15:14:57 -0700 (PDT) Received: by 10.230.35.30 with SMTP id n30gr2359vbd.0; Wed, 13 May 2009 15:14:57 -0700 (PDT) X-Sender: linus.ml.walleij@gmail.com X-Apparently-To: rtc-linux@googlegroups.com Received: by 10.103.189.15 with SMTP id r15mr18309mup.13.1242252896157; Wed, 13 May 2009 15:14:56 -0700 (PDT) Received: from mail-bw0-f177.google.com (mail-bw0-f177.google.com [209.85.218.177]) by gmr-mx.google.com with ESMTP id 3si19377fgg.7.2009.05.13.15.14.55; Wed, 13 May 2009 15:14:55 -0700 (PDT) Received-SPF: pass (google.com: domain of linus.ml.walleij@gmail.com designates 209.85.218.177 as permitted sender) client-ip=209.85.218.177; Authentication-Results: gmr-mx.google.com; spf=pass (google.com: domain of linus.ml.walleij@gmail.com designates 209.85.218.177 as permitted sender) smtp.mail=linus.ml.walleij@gmail.com; dkim=pass (test mode) header.i=@gmail.com Received: by bwz25 with SMTP id 25so984915bwz.0 for ; Wed, 13 May 2009 15:14:54 -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=PEqr8LhJ2aD/rtSpengOJaldVDy+e3PI+YIBZvx5S2Y=; b=Jn5qgKa0te0X0iEADTtp/z+bkktjKr5s8fuKtE1evWXfW9f45w2taj4McBvxhaUqbt pCOxwIZNNEVQWNInF5zSpLaK8ycLsDr6nHK0/T1TlNTMc8Xj34q7ncrPPIRjK/zU98MI oWlq27sxjKr1Ky+O3OIrIvaApPbPEiTdyFDzc= 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=exjXvfhwYAhjN87KUu/20nguZy+yTUWeCmZ3wdsco/DdFbSZGj40L8B05Bqxvuv2WC t9m2kdzUDRmS5DXJoH9URq7I9AFcgreGd5aixOyxp4xikVbCdYg7qlqT3nXeEGT72rL3 uGwPRkPTq0SC4KlpFgpaDlnmycbyE7xPuT0do= Mime-Version: 1.0 Received: by 10.102.228.10 with SMTP id a10mr1076879muh.26.1242252894818; Wed, 13 May 2009 15:14:54 -0700 (PDT) Date: Thu, 14 May 2009 00:14:54 +0200 Message-ID: <63386a3d0905131514g665722dahb9bf81ef6db0e4f7@mail.gmail.com> Subject: [rtc-linux] [PATCH] U300 COH 901 331 RTC driver v3 From: Linus Walleij To: Alessandro Zummo Cc: rtc-linux@googlegroups.com, Linus Walleij 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 Reviewed-by: Alessandro Zummo --- drivers/rtc/Kconfig | 12 ++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-coh901331.c | 311 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 324 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..7fe1fa2 --- /dev/null +++ b/drivers/rtc/rtc-coh901331.c @@ -0,0 +1,311 @@ +/* + * 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 +#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_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 rtc_valid_tm(tm); + } + clk_disable(rtap->clk); + return -EINVAL; +} + +static int coh901331_set_mmss(struct device *dev, unsigned long secs) +{ + struct coh901331_port *rtap = dev_get_drvdata(dev); + + clk_enable(rtap->clk); + writel(secs, 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_alarm_irq_enable(struct device *dev, unsigned int enabled) +{ + struct coh901331_port *rtap = dev_get_drvdata(dev); + + clk_enable(rtap->clk); + if (enabled) + writel(1, rtap->virtbase + COH901331_IRQ_MASK); + else + writel(0, rtap->virtbase + COH901331_IRQ_MASK); + clk_disable(rtap->clk); +} + +static struct rtc_class_ops coh901331_ops = { + .read_time = coh901331_read_time, + .set_mmss = coh901331_set_mmss, + .read_alarm = coh901331_read_alarm, + .set_alarm = coh901331_set_alarm, + .alarm_irq_enable = coh901331_alarm_irq_enable, +}; + +static int __exit coh901331_remove(struct platform_device *pdev) +{ + struct coh901331_port *rtap = dev_get_drvdata(&pdev->dev); + + if (rtap) { + free_irq(rtap->irq, rtap); + rtc_device_unregister(rtap->rtc); + clk_put(rtap->clk); + iounmap(rtap->virtbase); + release_mem_region(rtap->phybase, rtap->physize); + platform_set_drvdata(pdev, NULL); + kfree(rtap); + } + + return 0; +} + + +static int __init 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) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + ret = -ENOENT; + goto out_no_resource; + } + rtap->phybase = res->start; + rtap->physize = resource_size(res); + + 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, NULL); + 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); + 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", + .owner = THIS_MODULE, + }, + .remove = __exit_p(coh901331_remove), + .suspend = coh901331_suspend, + .resume = coh901331_resume, + .shutdown = coh901331_shutdown, +}; + +static int __init coh901331_init(void) +{ + return platform_driver_probe(&coh901331_driver, coh901331_probe); +} + +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");