Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756352Ab0KWTRl (ORCPT ); Tue, 23 Nov 2010 14:17:41 -0500 Received: from mail-pv0-f174.google.com ([74.125.83.174]:58084 "EHLO mail-pv0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754032Ab0KWTRj convert rfc822-to-8bit (ORCPT ); Tue, 23 Nov 2010 14:17:39 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=Gt5GInisfwIRNwSxp7eg0PY+S7rUJZVSbK31yxsiwo5dlDIhPoqD5naOcKAuEVShxr lgtkTv0LxhOX5ojGuhkFaO79IScyEZWRmvYFBHbqXShR8aSkBu0mqiwYRRXYdYixirbO o+RNRocyhJoxQlByRVSePB5tAYNeOuE4QgGoc= MIME-Version: 1.0 In-Reply-To: <20101114170032.GA4094@alchark-u3s.lan> References: <1289147348-31969-1-git-send-email-alchark@gmail.com> <1289147348-31969-5-git-send-email-alchark@gmail.com> <4CDE810F.2040400@metafoo.de> <20101113235632.GA20314@alchark-u3s.lan> <4CE00557.8020308@metafoo.de> <20101114170032.GA4094@alchark-u3s.lan> Date: Tue, 23 Nov 2010 22:17:37 +0300 Message-ID: Subject: Re: [PATCH 5/6 v4] rtc: Add support for the RTC in VIA VT8500 and compatibles From: Alexey Charkov To: Lars-Peter Clausen Cc: Alexey Charkov , linux-arm-kernel@lists.infradead.org, vt8500-wm8505-linux-kernel@googlegroups.com, Alessandro Zummo , linux-kernel@vger.kernel.org, rtc-linux@googlegroups.com Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 16712 Lines: 432 2010/11/14 Alexey Charkov : > This adds a driver for the RTC devices in VIA and WonderMedia > Systems-on-Chip. Alarm, 1Hz interrupts, reading and setting time > are supported. > > Signed-off-by: Alexey Charkov > --- > > Thanks for the comments, Lars! This version implements the latest > ones as well. > > Best regards, > Alexey > >  drivers/rtc/Kconfig      |    7 + >  drivers/rtc/Makefile     |    1 + >  drivers/rtc/rtc-vt8500.c |  359 ++++++++++++++++++++++++++++++++++++++++++++++ >  3 files changed, 367 insertions(+), 0 deletions(-) >  create mode 100644 drivers/rtc/rtc-vt8500.c > > diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig > index 2883428..27ed129 100644 > --- a/drivers/rtc/Kconfig > +++ b/drivers/rtc/Kconfig > @@ -865,6 +865,13 @@ config RTC_DRV_PXA >          This RTC driver uses PXA RTC registers available since pxa27x >          series (RDxR, RYxR) instead of legacy RCNR, RTAR. > > +config RTC_DRV_VT8500 > +       tristate "VIA/WonderMedia 85xx SoC RTC" > +       depends on ARCH_VT8500 > +       help > +         If you say Y here you will get access to the real time clock > +         built into your VIA VT8500 SoC or its relatives. > + > >  config RTC_DRV_SUN4V >        bool "SUN4V Hypervisor RTC" > diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile > index 4c2832d..1a354e1 100644 > --- a/drivers/rtc/Makefile > +++ b/drivers/rtc/Makefile > @@ -97,6 +97,7 @@ obj-$(CONFIG_RTC_DRV_TWL4030) += rtc-twl.o >  obj-$(CONFIG_RTC_DRV_TX4939)   += rtc-tx4939.o >  obj-$(CONFIG_RTC_DRV_V3020)    += rtc-v3020.o >  obj-$(CONFIG_RTC_DRV_VR41XX)   += rtc-vr41xx.o > +obj-$(CONFIG_RTC_DRV_VT8500)   += rtc-vt8500.o >  obj-$(CONFIG_RTC_DRV_WM831X)   += rtc-wm831x.o >  obj-$(CONFIG_RTC_DRV_WM8350)   += rtc-wm8350.o >  obj-$(CONFIG_RTC_DRV_X1205)    += rtc-x1205.o > diff --git a/drivers/rtc/rtc-vt8500.c b/drivers/rtc/rtc-vt8500.c > new file mode 100644 > index 0000000..cdf4f63 > --- /dev/null > +++ b/drivers/rtc/rtc-vt8500.c > @@ -0,0 +1,359 @@ > +/* > + * drivers/rtc/rtc-vt8500.c > + * > + *  Copyright (C) 2010 Alexey Charkov > + * > + * Based on rtc-pxa.c > + * > + * This software is licensed under the terms of the GNU General Public > + * License version 2, as published by the Free Software Foundation, and > + * may be copied, distributed, and modified under those terms. > + * > + * 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 > + > +/* > + * Register definitions > + */ > +#define VT8500_RTC_TS          0x00    /* Time set */ > +#define VT8500_RTC_DS          0x04    /* Date set */ > +#define VT8500_RTC_AS          0x08    /* Alarm set */ > +#define VT8500_RTC_CR          0x0c    /* Control */ > +#define VT8500_RTC_TR          0x10    /* Time read */ > +#define VT8500_RTC_DR          0x14    /* Date read */ > +#define VT8500_RTC_WS          0x18    /* Write status */ > +#define VT8500_RTC_CL          0x20    /* Calibration */ > +#define VT8500_RTC_IS          0x24    /* Interrupt status */ > +#define VT8500_RTC_ST          0x28    /* Status */ > + > +#define INVALID_TIME_BIT       (1 << 31) > + > +#define DATE_CENTURY_S         19 > +#define DATE_YEAR_S            11 > +#define DATE_YEAR_MASK         (0xff << DATE_YEAR_S) > +#define DATE_MONTH_S           6 > +#define DATE_MONTH_MASK                (0x1f << DATE_MONTH_S) > +#define DATE_DAY_MASK          0x3f > + > +#define TIME_DOW_S             20 > +#define TIME_DOW_MASK          (0x07 << TIME_DOW_S) > +#define TIME_HOUR_S            14 > +#define TIME_HOUR_MASK         (0x3f << TIME_HOUR_S) > +#define TIME_MIN_S             7 > +#define TIME_MIN_MASK          (0x7f << TIME_MIN_S) > +#define TIME_SEC_MASK          0x7f > + > +#define ALARM_DAY_S            20 > +#define ALARM_DAY_MASK         (0x3f << ALARM_DAY_S) > + > +#define ALARM_DAY_BIT          (1 << 29) > +#define ALARM_HOUR_BIT         (1 << 28) > +#define ALARM_MIN_BIT          (1 << 27) > +#define ALARM_SEC_BIT          (1 << 26) > + > +#define ALARM_ENABLE_MASK      (ALARM_DAY_BIT \ > +                               | ALARM_HOUR_BIT \ > +                               | ALARM_MIN_BIT \ > +                               | ALARM_SEC_BIT) > + > +#define VT8500_RTC_CR_ENABLE   (1 << 0)        /* Enable RTC */ > +#define VT8500_RTC_CR_24H      (1 << 1)        /* 24h time format */ > +#define VT8500_RTC_CR_SM_ENABLE        (1 << 2)        /* Enable periodic irqs */ > +#define VT8500_RTC_CR_SM_SEC   (1 << 3)        /* 0: 1Hz/60, 1: 1Hz */ > +#define VT8500_RTC_CR_CALIB    (1 << 4)        /* Enable calibration */ > + > +struct vt8500_rtc { > +       void __iomem            *regbase; > +       int                     irq_alarm; > +       int                     irq_hz; > +       struct rtc_device       *rtc; > +       spinlock_t              lock;           /* Protects this structure */ > +}; > + > +static irqreturn_t vt8500_rtc_irq(int irq, void *dev_id) > +{ > +       struct vt8500_rtc *vt8500_rtc = dev_id; > +       u32 isr; > +       unsigned long events = 0; > + > +       spin_lock(&vt8500_rtc->lock); > + > +       /* clear interrupt sources */ > +       isr = readl(vt8500_rtc->regbase + VT8500_RTC_IS); > +       writel(isr, vt8500_rtc->regbase + VT8500_RTC_IS); > + > +       spin_unlock(&vt8500_rtc->lock); > + > +       if (isr & 1) > +               events |= RTC_AF | RTC_IRQF; > + > +       /* Only second/minute interrupts are supported */ > +       if (isr & 2) > +               events |= RTC_UF | RTC_IRQF; > + > +       rtc_update_irq(vt8500_rtc->rtc, 1, events); > + > +       return IRQ_HANDLED; > +} > + > +static int vt8500_rtc_read_time(struct device *dev, struct rtc_time *tm) > +{ > +       struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev); > +       u32 date, time; > + > +       if (!readl(vt8500_rtc->regbase + VT8500_RTC_ST)) { > +               dev_info(dev, "Clock not set!"); > +               return -EINVAL; > +       } > +       date = readl(vt8500_rtc->regbase + VT8500_RTC_DR); > +       time = readl(vt8500_rtc->regbase + VT8500_RTC_TR); > + > +       tm->tm_sec = bcd2bin(time & TIME_SEC_MASK); > +       tm->tm_min = bcd2bin((time & TIME_MIN_MASK) >> TIME_MIN_S); > +       tm->tm_hour = bcd2bin((time & TIME_HOUR_MASK) >> TIME_HOUR_S); > +       tm->tm_mday = bcd2bin(date & DATE_DAY_MASK); > +       tm->tm_mon = bcd2bin((date & DATE_MONTH_MASK) >> DATE_MONTH_S); > +       tm->tm_year = bcd2bin((date & DATE_YEAR_MASK) >> DATE_YEAR_S); > +       tm->tm_wday = (time & TIME_DOW_MASK) >> TIME_DOW_S; > + > +       return rtc_valid_tm(tm); > +} > + > +static int vt8500_rtc_set_time(struct device *dev, struct rtc_time *tm) > +{ > +       struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev); > + > +       writel((bin2bcd(tm->tm_year) << DATE_YEAR_S) > +               | (bin2bcd(tm->tm_mon) << DATE_MONTH_S) > +               | (bin2bcd(tm->tm_mday)), > +               vt8500_rtc->regbase + VT8500_RTC_DS); > +       writel((bin2bcd(tm->tm_wday) << TIME_DOW_S) > +               | (bin2bcd(tm->tm_hour) << TIME_HOUR_S) > +               | (bin2bcd(tm->tm_min) << TIME_MIN_S) > +               | (bin2bcd(tm->tm_sec)), > +               vt8500_rtc->regbase + VT8500_RTC_TS); > + > +       return 0; > +} > + > +static int vt8500_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) > +{ > +       struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev); > +       u32 isr, alarm; > + > +       alarm = readl(vt8500_rtc->regbase + VT8500_RTC_AS); > +       isr = readl(vt8500_rtc->regbase + VT8500_RTC_IS); > + > +       alrm->time.tm_mday = bcd2bin((alarm & ALARM_DAY_MASK) >> ALARM_DAY_S); > +       alrm->time.tm_hour = bcd2bin((alarm & TIME_HOUR_MASK) >> TIME_HOUR_S); > +       alrm->time.tm_min = bcd2bin((alarm & TIME_MIN_MASK) >> TIME_MIN_S); > +       alrm->time.tm_sec = bcd2bin((alarm & TIME_SEC_MASK)); > + > +       alrm->enabled = (alarm & ALARM_ENABLE_MASK) ? 1 : 0; > + > +       alrm->pending = (isr & 1) ? 1 : 0; > +       return rtc_valid_tm(&alrm->time); > +} > + > +static int vt8500_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) > +{ > +       struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev); > + > +       writel((alrm->enabled ? ALARM_ENABLE_MASK : 0) > +               | (bin2bcd(alrm->time.tm_mday) << ALARM_DAY_S) > +               | (bin2bcd(alrm->time.tm_hour) << TIME_HOUR_S) > +               | (bin2bcd(alrm->time.tm_min) << TIME_MIN_S) > +               | (bin2bcd(alrm->time.tm_sec)), > +               vt8500_rtc->regbase + VT8500_RTC_AS); > + > +       return 0; > +} > + > +static int vt8500_alarm_irq_enable(struct device *dev, unsigned int enabled) > +{ > +       struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev); > +       unsigned long tmp = readl(vt8500_rtc->regbase + VT8500_RTC_AS); > + > +       if (enabled) > +               tmp |= ALARM_ENABLE_MASK; > +       else > +               tmp &= ~ALARM_ENABLE_MASK; > + > +       writel(tmp, vt8500_rtc->regbase + VT8500_RTC_AS); > +       return 0; > +} > + > +static int vt8500_update_irq_enable(struct device *dev, unsigned int enabled) > +{ > +       struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev); > +       unsigned long tmp = readl(vt8500_rtc->regbase + VT8500_RTC_CR); > + > +       if (enabled) > +               tmp |= VT8500_RTC_CR_SM_SEC | VT8500_RTC_CR_SM_ENABLE; > +       else > +               tmp &= ~VT8500_RTC_CR_SM_ENABLE; > + > +       writel(tmp, vt8500_rtc->regbase + VT8500_RTC_CR); > +       return 0; > +} > + > +static const struct rtc_class_ops vt8500_rtc_ops = { > +       .read_time = vt8500_rtc_read_time, > +       .set_time = vt8500_rtc_set_time, > +       .read_alarm = vt8500_rtc_read_alarm, > +       .set_alarm = vt8500_rtc_set_alarm, > +       .alarm_irq_enable = vt8500_alarm_irq_enable, > +       .update_irq_enable = vt8500_update_irq_enable, > +}; > + > +static int __devinit vt8500_rtc_probe(struct platform_device *pdev) > +{ > +       struct vt8500_rtc *vt8500_rtc; > +       struct resource *res; > +       int ret; > + > +       vt8500_rtc = kzalloc(sizeof(struct vt8500_rtc), GFP_KERNEL); > +       if (!vt8500_rtc) > +               return -ENOMEM; > + > +       spin_lock_init(&vt8500_rtc->lock); > +       platform_set_drvdata(pdev, vt8500_rtc); > + > +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > +       if (!res) { > +               dev_err(&pdev->dev, "No I/O memory resource defined\n"); > +               ret = -ENXIO; > +               goto err_free; > +       } > + > +       vt8500_rtc->irq_alarm = platform_get_irq(pdev, 0); > +       if (vt8500_rtc->irq_alarm < 0) { > +               dev_err(&pdev->dev, "No alarm IRQ resource defined\n"); > +               ret = -ENXIO; > +               goto err_free; > +       } > + > +       vt8500_rtc->irq_hz = platform_get_irq(pdev, 1); > +       if (vt8500_rtc->irq_hz < 0) { > +               dev_err(&pdev->dev, "No 1Hz IRQ resource defined\n"); > +               ret = -ENXIO; > +               goto err_free; > +       } > + > +       res = request_mem_region(res->start, resource_size(res), "vt8500-rtc"); > +       if (res == NULL) { > +               dev_err(&pdev->dev, "failed to request I/O memory\n"); > +               ret = -EBUSY; > +               goto err_free; > +       } > + > +       vt8500_rtc->regbase = ioremap(res->start, resource_size(res)); > +       if (!vt8500_rtc->regbase) { > +               dev_err(&pdev->dev, "Unable to map RTC I/O memory\n"); > +               ret = -EBUSY; > +               goto err_release; > +       } > + > +       /* Enable the second/minute interrupt generation and enable RTC */ > +       writel(VT8500_RTC_CR_ENABLE | VT8500_RTC_CR_24H > +               | VT8500_RTC_CR_SM_ENABLE | VT8500_RTC_CR_SM_SEC, > +              vt8500_rtc->regbase + VT8500_RTC_CR); > + > +       vt8500_rtc->rtc = rtc_device_register("vt8500-rtc", &pdev->dev, > +                                             &vt8500_rtc_ops, THIS_MODULE); > +       if (IS_ERR(vt8500_rtc->rtc)) { > +               ret = PTR_ERR(vt8500_rtc->rtc); > +               dev_err(&pdev->dev, > +                       "Failed to register RTC device -> %d\n", ret); > +               goto err_unmap; > +       } > + > +       ret = request_irq(vt8500_rtc->irq_hz, vt8500_rtc_irq, 0, > +                         "rtc 1Hz", vt8500_rtc); > +       if (ret < 0) { > +               dev_err(&pdev->dev, "can't get irq %i, err %d\n", > +                       vt8500_rtc->irq_hz, ret); > +               goto err_unreg; > +       } > + > +       ret = request_irq(vt8500_rtc->irq_alarm, vt8500_rtc_irq, 0, > +                         "rtc alarm", vt8500_rtc); > +       if (ret < 0) { > +               dev_err(&pdev->dev, "can't get irq %i, err %d\n", > +                       vt8500_rtc->irq_alarm, ret); > +               goto err_free_hz; > +       } > + > +       return 0; > + > +err_free_hz: > +       free_irq(vt8500_rtc->irq_hz, vt8500_rtc); > +err_unreg: > +       rtc_device_unregister(vt8500_rtc->rtc); > +err_unmap: > +       iounmap(vt8500_rtc->regbase); > +err_release: > +       release_mem_region(res->start, resource_size(res)); > +err_free: > +       kfree(vt8500_rtc); > +       return ret; > +} > + > +static int __devexit vt8500_rtc_remove(struct platform_device *pdev) > +{ > +       struct vt8500_rtc *vt8500_rtc = platform_get_drvdata(pdev); > +       struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + > +       free_irq(vt8500_rtc->irq_alarm, vt8500_rtc); > +       free_irq(vt8500_rtc->irq_hz, vt8500_rtc); > + > +       rtc_device_unregister(vt8500_rtc->rtc); > + > +       /* Disable alarm matching */ > +       writel(0, vt8500_rtc->regbase + VT8500_RTC_IS); > +       iounmap(vt8500_rtc->regbase); > +       release_mem_region(res->start, resource_size(res)); > + > +       kfree(vt8500_rtc); > +       platform_set_drvdata(pdev, NULL); > + > +       return 0; > +} > + > +static struct platform_driver vt8500_rtc_driver = { > +       .probe          = vt8500_rtc_probe, > +       .remove         = __devexit_p(vt8500_rtc_remove), > +       .driver         = { > +               .name   = "vt8500-rtc", > +               .owner  = THIS_MODULE, > +       }, > +}; > + > +static int __init vt8500_rtc_init(void) > +{ > +       return platform_driver_register(&vt8500_rtc_driver); > +} > +module_init(vt8500_rtc_init); > + > +static void __exit vt8500_rtc_exit(void) > +{ > +       platform_driver_unregister(&vt8500_rtc_driver); > +} > +module_exit(vt8500_rtc_exit); > + > +MODULE_AUTHOR("Alexey Charkov "); > +MODULE_DESCRIPTION("VIA VT8500 SoC Realtime Clock Driver (RTC)"); > +MODULE_LICENSE("GPL"); > +MODULE_ALIAS("platform:vt8500-rtc"); > -- > 1.7.3.2 > > Any further comments about this code? Could it be merged now? Lars, sorry for double-posting this (forgot to CC the lists and others last time). Thanks, Alexey -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/