[PATCH] Add driver for ARM AMBA PL031 RTC
Add a driver for the ARM PL031 RTC found on some ARM SOCs. The driver is fairly trivial as the RTC only provides a read/write and alarm capability. [akpm@osdl.org: compile fix] Signed-off-by: Deepak <dsaxena@plexity.net> Acked-by: Alessandro Zummo <a.zummo@towertech.it> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Deepak Saxena
Linus Torvalds
parent
dcd9637961
commit
8ae6e163c1
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@ -157,6 +157,16 @@ config RTC_DRV_VR41XX
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To compile this driver as a module, choose M here: the
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module will be called rtc-vr41xx.
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config RTC_DRV_PL031
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tristate "ARM AMBA PL031 RTC"
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depends on RTC_CLASS && ARM_AMBA
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help
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If you say Y here you will get access to ARM AMBA
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PrimeCell PL031 UART found on certain ARM SOCs.
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To compile this driver as a module, choose M here: the
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module will be called rtc-pl031.
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config RTC_DRV_TEST
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tristate "Test driver/device"
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depends on RTC_CLASS
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@ -20,3 +20,4 @@ obj-$(CONFIG_RTC_DRV_M48T86) += rtc-m48t86.o
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obj-$(CONFIG_RTC_DRV_EP93XX) += rtc-ep93xx.o
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obj-$(CONFIG_RTC_DRV_SA1100) += rtc-sa1100.o
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obj-$(CONFIG_RTC_DRV_VR41XX) += rtc-vr41xx.o
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obj-$(CONFIG_RTC_DRV_PL031) += rtc-pl031.o
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@ -0,0 +1,233 @@
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/*
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* drivers/rtc/rtc-pl031.c
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*
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* Real Time Clock interface for ARM AMBA PrimeCell 031 RTC
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*
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* Author: Deepak Saxena <dsaxena@plexity.net>
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*
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* Copyright 2006 (c) MontaVista Software, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/rtc.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/interrupt.h>
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#include <linux/string.h>
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#include <linux/pm.h>
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#include <linux/amba/bus.h>
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#include <asm/io.h>
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#include <asm/bitops.h>
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#include <asm/hardware.h>
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#include <asm/irq.h>
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#include <asm/rtc.h>
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/*
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* Register definitions
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*/
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#define RTC_DR 0x00 /* Data read register */
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#define RTC_MR 0x04 /* Match register */
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#define RTC_LR 0x08 /* Data load register */
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#define RTC_CR 0x0c /* Control register */
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#define RTC_IMSC 0x10 /* Interrupt mask and set register */
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#define RTC_RIS 0x14 /* Raw interrupt status register */
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#define RTC_MIS 0x18 /* Masked interrupt status register */
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#define RTC_ICR 0x1c /* Interrupt clear register */
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struct pl031_local {
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struct rtc_device *rtc;
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void __iomem *base;
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};
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static irqreturn_t pl031_interrupt(int irq, void *dev_id, struct pt_regs *regs)
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{
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struct rtc_device *rtc = dev_id;
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rtc_update_irq(&rtc->class_dev, 1, RTC_AF);
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return IRQ_HANDLED;
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}
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static int pl031_open(struct device *dev)
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{
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/*
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* We request IRQ in pl031_probe, so nothing to do here...
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*/
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return 0;
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}
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static void pl031_release(struct device *dev)
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{
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}
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static int pl031_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
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{
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struct pl031_local *ldata = dev_get_drvdata(dev);
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switch (cmd) {
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case RTC_AIE_OFF:
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__raw_writel(1, ldata->base + RTC_MIS);
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return 0;
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case RTC_AIE_ON:
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__raw_writel(0, ldata->base + RTC_MIS);
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return 0;
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}
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return -ENOIOCTLCMD;
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}
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static int pl031_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct pl031_local *ldata = dev_get_drvdata(dev);
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rtc_time_to_tm(__raw_readl(ldata->base + RTC_DR), tm);
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return 0;
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}
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static int pl031_set_time(struct device *dev, struct rtc_time *tm)
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{
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unsigned long time;
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struct pl031_local *ldata = dev_get_drvdata(dev);
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rtc_tm_to_time(tm, &time);
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__raw_writel(time, ldata->base + RTC_LR);
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return 0;
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}
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static int pl031_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
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{
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struct pl031_local *ldata = dev_get_drvdata(dev);
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rtc_time_to_tm(__raw_readl(ldata->base + RTC_MR), &alarm->time);
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alarm->pending = __raw_readl(ldata->base + RTC_RIS);
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alarm->enabled = __raw_readl(ldata->base + RTC_IMSC);
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return 0;
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}
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static int pl031_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
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{
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struct pl031_local *ldata = dev_get_drvdata(dev);
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unsigned long time;
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rtc_tm_to_time(&alarm->time, &time);
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__raw_writel(time, ldata->base + RTC_MR);
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__raw_writel(!alarm->enabled, ldata->base + RTC_MIS);
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return 0;
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}
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static struct rtc_class_ops pl031_ops = {
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.open = pl031_open,
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.release = pl031_release,
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.ioctl = pl031_ioctl,
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.read_time = pl031_read_time,
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.set_time = pl031_set_time,
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.read_alarm = pl031_read_alarm,
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.set_alarm = pl031_set_alarm,
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};
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static int pl031_remove(struct amba_device *adev)
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{
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struct pl031_local *ldata = dev_get_drvdata(&adev->dev);
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if (ldata) {
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dev_set_drvdata(&adev->dev, NULL);
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free_irq(adev->irq[0], ldata->rtc);
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rtc_device_unregister(ldata->rtc);
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iounmap(ldata->base);
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kfree(ldata);
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}
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return 0;
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}
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static int pl031_probe(struct amba_device *adev, void *id)
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{
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int ret;
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struct pl031_local *ldata;
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ldata = kmalloc(sizeof(struct pl031_local), GFP_KERNEL);
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if (!ldata) {
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ret = -ENOMEM;
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goto out;
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}
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dev_set_drvdata(&adev->dev, ldata);
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ldata->base = ioremap(adev->res.start,
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adev->res.end - adev->res.start + 1);
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if (!ldata->base) {
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ret = -ENOMEM;
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goto out_no_remap;
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}
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if (request_irq(adev->irq[0], pl031_interrupt, SA_INTERRUPT,
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"rtc-pl031", ldata->rtc)) {
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ret = -EIO;
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goto out_no_irq;
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}
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ldata->rtc = rtc_device_register("pl031", &adev->dev, &pl031_ops,
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THIS_MODULE);
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if (IS_ERR(ldata->rtc)) {
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ret = PTR_ERR(ldata->rtc);
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goto out_no_rtc;
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}
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return 0;
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out_no_rtc:
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free_irq(adev->irq[0], ldata->rtc);
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out_no_irq:
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iounmap(ldata->base);
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out_no_remap:
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dev_set_drvdata(&adev->dev, NULL);
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kfree(ldata);
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out:
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return ret;
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}
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static struct amba_id pl031_ids[] __initdata = {
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{
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.id = 0x00041031,
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.mask = 0x000fffff, },
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{0, 0},
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};
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static struct amba_driver pl031_driver = {
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.drv = {
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.name = "rtc-pl031",
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},
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.id_table = pl031_ids,
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.probe = pl031_probe,
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.remove = pl031_remove,
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};
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static int __init pl031_init(void)
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{
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return amba_driver_register(&pl031_driver);
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}
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static void __exit pl031_exit(void)
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{
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amba_driver_unregister(&pl031_driver);
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}
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module_init(pl031_init);
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module_exit(pl031_exit);
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MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net");
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MODULE_DESCRIPTION("ARM AMBA PL031 RTC Driver");
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MODULE_LICENSE("GPL");
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