Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753827Ab0KGQbc (ORCPT ); Sun, 7 Nov 2010 11:31:32 -0500 Received: from mail-ew0-f46.google.com ([209.85.215.46]:49437 "EHLO mail-ew0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753681Ab0KGQb3 (ORCPT ); Sun, 7 Nov 2010 11:31:29 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references; b=h5mE53/SGiFADFpZzOlratKZgqg9D/ryk/0Bxv20QFgioaoBw12q0+Xy79TsvnegAC 79ZIa1PSWSDyMyLiB5opgprfSYZbaIlQ1n0H4RoTGsdAxv4n5KPPBHtVxPvLNfWt4HTX 0ESTQUT6QH822M/KwSJo6m3p+7kXE+H1Gc4Zk= From: Alexey Charkov To: linux-arm-kernel@lists.infradead.org Cc: vt8500-wm8505-linux-kernel@googlegroups.com, Alexey Charkov , Alessandro Zummo , rtc-linux@googlegroups.com, linux-kernel@vger.kernel.org Subject: [PATCH 5/6 v2] rtc: Add support for the RTC in VIA VT8500 and compatibles Date: Sun, 7 Nov 2010 19:28:56 +0300 Message-Id: <1289147348-31969-5-git-send-email-alchark@gmail.com> X-Mailer: git-send-email 1.7.3.2 In-Reply-To: <1289147348-31969-1-git-send-email-alchark@gmail.com> References: <1289147348-31969-1-git-send-email-alchark@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 12488 Lines: 432 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 --- Please review and (if appropriate) commit to a relevant git tree for further integration in 2.6.38. Compared to the previous submission, this code just contains a rebase against the latest changes introduced in 2.6.37 merge window. Relevant platform definitions are introduced by PATCH 1/6 in this series, so one would need that to make use of this code. Due credits go to the community for providing feedback, advice and testing. drivers/rtc/Kconfig | 7 + drivers/rtc/Makefile | 1 + drivers/rtc/rtc-vt8500.c | 363 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 371 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..7260c95 --- /dev/null +++ b/drivers/rtc/rtc-vt8500.c @@ -0,0 +1,363 @@ +/* + * 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) + +struct vt8500_rtc { + void __iomem *regbase; + int irq_alarm; + int irq_hz; + struct rtc_device *rtc; + spinlock_t lock; /* Protects this structure */ + struct rtc_time rtc_alarm; +}; + +static irqreturn_t vt8500_rtc_irq(int irq, void *dev_id) +{ + struct platform_device *pdev = to_platform_device(dev_id); + struct vt8500_rtc *vt8500_rtc = platform_get_drvdata(pdev); + 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); + + 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); + + spin_unlock(&vt8500_rtc->lock); + return IRQ_HANDLED; +} + +static int vt8500_rtc_open(struct device *dev) +{ + struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev); + int ret; + + ret = request_irq(vt8500_rtc->irq_hz, vt8500_rtc_irq, IRQF_DISABLED, + "rtc 1Hz", dev); + if (ret < 0) { + dev_err(dev, "can't get irq %i, err %d\n", vt8500_rtc->irq_hz, + ret); + goto err_irq_hz; + } + ret = request_irq(vt8500_rtc->irq_alarm, vt8500_rtc_irq, IRQF_DISABLED, + "rtc alarm", dev); + if (ret < 0) { + dev_err(dev, "can't get irq %i, err %d\n", + vt8500_rtc->irq_alarm, ret); + goto err_irq_alarm; + } + return 0; + +err_irq_alarm: + free_irq(vt8500_rtc->irq_hz, dev); +err_irq_hz: + return ret; +} + +static void vt8500_rtc_release(struct device *dev) +{ + struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev); + + spin_lock_irq(&vt8500_rtc->lock); + /* Disable alarm matching */ + writel(0, vt8500_rtc->regbase + VT8500_RTC_IS); + spin_unlock_irq(&vt8500_rtc->lock); + + free_irq(vt8500_rtc->irq_alarm, dev); + free_irq(vt8500_rtc->irq_hz, dev); +} + +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; + + 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 0; +} + +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 0; +} + +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_rtc_ioctl(struct device *dev, unsigned int cmd, + unsigned long arg) +{ + struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev); + int ret = 0; + unsigned long tmp; + + spin_lock_irq(&vt8500_rtc->lock); + switch (cmd) { + case RTC_AIE_OFF: + tmp = readl(vt8500_rtc->regbase + VT8500_RTC_AS); + writel(tmp & ~ALARM_ENABLE_MASK, + vt8500_rtc->regbase + VT8500_RTC_AS); + break; + case RTC_AIE_ON: + tmp = readl(vt8500_rtc->regbase + VT8500_RTC_AS); + writel(tmp | ALARM_ENABLE_MASK, + vt8500_rtc->regbase + VT8500_RTC_AS); + break; + case RTC_UIE_OFF: + tmp = readl(vt8500_rtc->regbase + VT8500_RTC_CR); + writel(tmp & ~(1 << 2), + vt8500_rtc->regbase + VT8500_RTC_CR); + break; + case RTC_UIE_ON: + tmp = readl(vt8500_rtc->regbase + VT8500_RTC_CR); + writel(tmp | ((1 << 3) | (1 << 2)), + vt8500_rtc->regbase + VT8500_RTC_CR); + break; + default: + ret = -ENOIOCTLCMD; + } + + spin_unlock_irq(&vt8500_rtc->lock); + return ret; +} + +static const struct rtc_class_ops vt8500_rtc_ops = { + .open = vt8500_rtc_open, + .release = vt8500_rtc_release, + .ioctl = vt8500_rtc_ioctl, + .read_time = vt8500_rtc_read_time, + .set_time = vt8500_rtc_set_time, + .read_alarm = vt8500_rtc_read_alarm, + .set_alarm = vt8500_rtc_set_alarm, +}; + +static int __init vt8500_rtc_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + 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); + + ret = -ENXIO; + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(dev, "No I/O memory resource defined\n"); + goto err_map; + } + + vt8500_rtc->irq_alarm = platform_get_irq(pdev, 0); + if (vt8500_rtc->irq_alarm < 0) { + dev_err(dev, "No alarm IRQ resource defined\n"); + goto err_map; + } + + vt8500_rtc->irq_hz = platform_get_irq(pdev, 1); + if (vt8500_rtc->irq_hz < 0) { + dev_err(dev, "No 1Hz IRQ resource defined\n"); + goto err_map; + } + + ret = -ENOMEM; + 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"); + goto err_map; + } + + /* Enable the second/minute interrupt generation and enable RTC */ + writel((1 << 3) | (1 << 2) | 1, vt8500_rtc->regbase + VT8500_RTC_CR); + + vt8500_rtc->rtc = rtc_device_register("vt8500-rtc", &pdev->dev, + &vt8500_rtc_ops, THIS_MODULE); + ret = PTR_ERR(vt8500_rtc->rtc); + if (IS_ERR(vt8500_rtc->rtc)) { + dev_err(dev, "Failed to register RTC device -> %d\n", ret); + goto err_rtc_reg; + } + + device_init_wakeup(dev, 1); + + return 0; + +err_rtc_reg: + iounmap(vt8500_rtc->regbase); +err_map: + kfree(vt8500_rtc); + return ret; +} + +static int __exit vt8500_rtc_remove(struct platform_device *pdev) +{ + struct vt8500_rtc *vt8500_rtc = platform_get_drvdata(pdev); + + rtc_device_unregister(vt8500_rtc->rtc); + + spin_lock_irq(&vt8500_rtc->lock); + iounmap(vt8500_rtc->regbase); + spin_unlock_irq(&vt8500_rtc->lock); + + kfree(vt8500_rtc); + + return 0; +} + +static struct platform_driver vt8500_rtc_driver = { + .probe = vt8500_rtc_probe, + .remove = __exit_p(vt8500_rtc_remove), + .driver = { + .name = "vt8500-rtc" + }, +}; + +static int __init vt8500_rtc_init(void) +{ + return platform_driver_register(&vt8500_rtc_driver); +} + +static void __exit vt8500_rtc_exit(void) +{ + platform_driver_unregister(&vt8500_rtc_driver); +} + +module_init(vt8500_rtc_init); +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 -- 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/