From patchwork Sat Jun 20 16:08:46 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alessandro Zummo X-Patchwork-Id: 28933 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from mail-yx0-f148.google.com (mail-yx0-f148.google.com [209.85.210.148]) by bilbo.ozlabs.org (Postfix) with ESMTP id 1A734B7163 for ; Sun, 21 Jun 2009 02:08:53 +1000 (EST) Received: by yxe12 with SMTP id 12so1403887yxe.29 for ; Sat, 20 Jun 2009 09:08:52 -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 :received:from:subject:to:cc:date:message-id:in-reply-to:references :user-agent:mime-version:content-type:reply-to:sender:precedence :x-google-loop:mailing-list:list-id:list-post:list-help :list-unsubscribe:x-beenthere-env:x-beenthere; bh=Jtgw0W3wIddI6AnQ7+nD5xgtK9DWGv2I6M4FRa/lqlU=; b=jnerteS/s/pPJF8FHYuxhCvYLZPgZGTm+ycgqLMf6IXC5iT7wwjBQbI4k+A9uidr6W Px7h+926nbTneeVvKq+CBq7L5NHoXK/08yCXNNOaB9Ni3XfIQzaTWzIdYz3jNFeTXaEO JAjVs69AQE4278AdjuOt4Qrnw9t1ov9BRL25I= DomainKey-Signature: a=rsa-sha1; c=nofws; d=googlegroups.com; s=beta; h=x-sender:x-apparently-to:received-spf:authentication-results:from :subject:to:cc:date:message-id:in-reply-to:references:user-agent :mime-version:content-type:reply-to:sender:precedence:x-google-loop :mailing-list:list-id:list-post:list-help:list-unsubscribe :x-beenthere-env:x-beenthere; b=e/pwQW6847WdGxMLhZ7XHjtAVW4NwVS8cw07hPkMw7ZFP1LXkNJGZxZwP/HFbFMIgQ cQ723ZxedN1rJLTItolUdQbHa6fqaeB0BnR9KBy5ZJW7nHR/UoIbv0PHOC/o2ScATuse 6cQ16njUkQw39ebs+FpcHH5AMwlSNt/Ss4mqQ= Received: by 10.90.84.17 with SMTP id h17mr652234agb.7.1245514128189; Sat, 20 Jun 2009 09:08:48 -0700 (PDT) Received: by 10.177.2.5 with SMTP id e5gr2498yqi.0; Sat, 20 Jun 2009 09:08:48 -0700 (PDT) X-Sender: a.zummo@towertech.it X-Apparently-To: rtc-linux@googlegroups.com Received: by 10.204.31.83 with SMTP id x19mr151498bkc.0.1245514127116; Sat, 20 Jun 2009 09:08:47 -0700 (PDT) Received: from mx0.towertech.it (mx0.towertech.it [213.215.222.73]) by gmr-mx.google.com with SMTP id 13si441422bwz.7.2009.06.20.09.08.46; Sat, 20 Jun 2009 09:08:47 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of a.zummo@towertech.it designates 213.215.222.73 as permitted sender) client-ip=213.215.222.73; Authentication-Results: gmr-mx.google.com; spf=pass (google.com: best guess record for domain of a.zummo@towertech.it designates 213.215.222.73 as permitted sender) smtp.mail=a.zummo@towertech.it Received: (qmail 4033 invoked from network); 20 Jun 2009 18:08:46 +0200 Received: from unknown (HELO i1501.lan.towertech.it) (93.39.57.60) by mx0.towertech.it with SMTP; 20 Jun 2009 18:08:46 +0200 From: Alessandro Zummo Subject: [rtc-linux] [PATCH 2/9] rtc: U300 COH 901 331 RTC driver v3 To: akpm@linux-foundation.org Cc: rtc-linux@googlegroups.com, Linus Walleij , Alessandro Zummo Date: Sat, 20 Jun 2009 18:08:46 +0200 Message-ID: <20090620160845.6953.34342.stgit@i1501.lan.towertech.it> In-Reply-To: <20090620160839.6953.41960.stgit@i1501.lan.towertech.it> References: <20090620160839.6953.41960.stgit@i1501.lan.towertech.it> User-Agent: StGIT/0.14.2 Mime-Version: 1.0 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 From: Linus Walleij 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 Signed-off-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 --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to "rtc-linux". Membership options at http://groups.google.com/group/rtc-linux . Please read http://groups.google.com/group/rtc-linux/web/checklist before submitting a driver. -~----------~----~----~----~------~----~------~--~--- diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 14d5f9c..e9bebaf 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -770,4 +770,16 @@ 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 91422db..51f589d 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -79,3 +79,4 @@ 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");