mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-13 14:24:11 +08:00
[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
@ -157,6 +157,16 @@ config RTC_DRV_VR41XX
|
||||
To compile this driver as a module, choose M here: the
|
||||
module will be called rtc-vr41xx.
|
||||
|
||||
config RTC_DRV_PL031
|
||||
tristate "ARM AMBA PL031 RTC"
|
||||
depends on RTC_CLASS && ARM_AMBA
|
||||
help
|
||||
If you say Y here you will get access to ARM AMBA
|
||||
PrimeCell PL031 UART found on certain ARM SOCs.
|
||||
|
||||
To compile this driver as a module, choose M here: the
|
||||
module will be called rtc-pl031.
|
||||
|
||||
config RTC_DRV_TEST
|
||||
tristate "Test driver/device"
|
||||
depends on RTC_CLASS
|
||||
|
||||
@ -20,3 +20,4 @@ obj-$(CONFIG_RTC_DRV_M48T86) += rtc-m48t86.o
|
||||
obj-$(CONFIG_RTC_DRV_EP93XX) += rtc-ep93xx.o
|
||||
obj-$(CONFIG_RTC_DRV_SA1100) += rtc-sa1100.o
|
||||
obj-$(CONFIG_RTC_DRV_VR41XX) += rtc-vr41xx.o
|
||||
obj-$(CONFIG_RTC_DRV_PL031) += rtc-pl031.o
|
||||
|
||||
233
drivers/rtc/rtc-pl031.c
Normal file
233
drivers/rtc/rtc-pl031.c
Normal file
@ -0,0 +1,233 @@
|
||||
/*
|
||||
* drivers/rtc/rtc-pl031.c
|
||||
*
|
||||
* Real Time Clock interface for ARM AMBA PrimeCell 031 RTC
|
||||
*
|
||||
* Author: Deepak Saxena <dsaxena@plexity.net>
|
||||
*
|
||||
* Copyright 2006 (c) MontaVista Software, Inc.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU General Public License
|
||||
* as published by the Free Software Foundation; either version
|
||||
* 2 of the License, or (at your option) any later version.
|
||||
*/
|
||||
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/rtc.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/fs.h>
|
||||
#include <linux/interrupt.h>
|
||||
#include <linux/string.h>
|
||||
#include <linux/pm.h>
|
||||
|
||||
#include <linux/amba/bus.h>
|
||||
|
||||
#include <asm/io.h>
|
||||
#include <asm/bitops.h>
|
||||
#include <asm/hardware.h>
|
||||
#include <asm/irq.h>
|
||||
#include <asm/rtc.h>
|
||||
|
||||
/*
|
||||
* Register definitions
|
||||
*/
|
||||
#define RTC_DR 0x00 /* Data read register */
|
||||
#define RTC_MR 0x04 /* Match register */
|
||||
#define RTC_LR 0x08 /* Data load register */
|
||||
#define RTC_CR 0x0c /* Control register */
|
||||
#define RTC_IMSC 0x10 /* Interrupt mask and set register */
|
||||
#define RTC_RIS 0x14 /* Raw interrupt status register */
|
||||
#define RTC_MIS 0x18 /* Masked interrupt status register */
|
||||
#define RTC_ICR 0x1c /* Interrupt clear register */
|
||||
|
||||
struct pl031_local {
|
||||
struct rtc_device *rtc;
|
||||
void __iomem *base;
|
||||
};
|
||||
|
||||
static irqreturn_t pl031_interrupt(int irq, void *dev_id, struct pt_regs *regs)
|
||||
{
|
||||
struct rtc_device *rtc = dev_id;
|
||||
|
||||
rtc_update_irq(&rtc->class_dev, 1, RTC_AF);
|
||||
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
static int pl031_open(struct device *dev)
|
||||
{
|
||||
/*
|
||||
* We request IRQ in pl031_probe, so nothing to do here...
|
||||
*/
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void pl031_release(struct device *dev)
|
||||
{
|
||||
}
|
||||
|
||||
static int pl031_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
|
||||
{
|
||||
struct pl031_local *ldata = dev_get_drvdata(dev);
|
||||
|
||||
switch (cmd) {
|
||||
case RTC_AIE_OFF:
|
||||
__raw_writel(1, ldata->base + RTC_MIS);
|
||||
return 0;
|
||||
case RTC_AIE_ON:
|
||||
__raw_writel(0, ldata->base + RTC_MIS);
|
||||
return 0;
|
||||
}
|
||||
|
||||
return -ENOIOCTLCMD;
|
||||
}
|
||||
|
||||
static int pl031_read_time(struct device *dev, struct rtc_time *tm)
|
||||
{
|
||||
struct pl031_local *ldata = dev_get_drvdata(dev);
|
||||
|
||||
rtc_time_to_tm(__raw_readl(ldata->base + RTC_DR), tm);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int pl031_set_time(struct device *dev, struct rtc_time *tm)
|
||||
{
|
||||
unsigned long time;
|
||||
struct pl031_local *ldata = dev_get_drvdata(dev);
|
||||
|
||||
rtc_tm_to_time(tm, &time);
|
||||
__raw_writel(time, ldata->base + RTC_LR);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int pl031_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
|
||||
{
|
||||
struct pl031_local *ldata = dev_get_drvdata(dev);
|
||||
|
||||
rtc_time_to_tm(__raw_readl(ldata->base + RTC_MR), &alarm->time);
|
||||
alarm->pending = __raw_readl(ldata->base + RTC_RIS);
|
||||
alarm->enabled = __raw_readl(ldata->base + RTC_IMSC);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int pl031_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
|
||||
{
|
||||
struct pl031_local *ldata = dev_get_drvdata(dev);
|
||||
unsigned long time;
|
||||
|
||||
rtc_tm_to_time(&alarm->time, &time);
|
||||
|
||||
__raw_writel(time, ldata->base + RTC_MR);
|
||||
__raw_writel(!alarm->enabled, ldata->base + RTC_MIS);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct rtc_class_ops pl031_ops = {
|
||||
.open = pl031_open,
|
||||
.release = pl031_release,
|
||||
.ioctl = pl031_ioctl,
|
||||
.read_time = pl031_read_time,
|
||||
.set_time = pl031_set_time,
|
||||
.read_alarm = pl031_read_alarm,
|
||||
.set_alarm = pl031_set_alarm,
|
||||
};
|
||||
|
||||
static int pl031_remove(struct amba_device *adev)
|
||||
{
|
||||
struct pl031_local *ldata = dev_get_drvdata(&adev->dev);
|
||||
|
||||
if (ldata) {
|
||||
dev_set_drvdata(&adev->dev, NULL);
|
||||
free_irq(adev->irq[0], ldata->rtc);
|
||||
rtc_device_unregister(ldata->rtc);
|
||||
iounmap(ldata->base);
|
||||
kfree(ldata);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int pl031_probe(struct amba_device *adev, void *id)
|
||||
{
|
||||
int ret;
|
||||
struct pl031_local *ldata;
|
||||
|
||||
|
||||
ldata = kmalloc(sizeof(struct pl031_local), GFP_KERNEL);
|
||||
if (!ldata) {
|
||||
ret = -ENOMEM;
|
||||
goto out;
|
||||
}
|
||||
dev_set_drvdata(&adev->dev, ldata);
|
||||
|
||||
ldata->base = ioremap(adev->res.start,
|
||||
adev->res.end - adev->res.start + 1);
|
||||
if (!ldata->base) {
|
||||
ret = -ENOMEM;
|
||||
goto out_no_remap;
|
||||
}
|
||||
|
||||
if (request_irq(adev->irq[0], pl031_interrupt, SA_INTERRUPT,
|
||||
"rtc-pl031", ldata->rtc)) {
|
||||
ret = -EIO;
|
||||
goto out_no_irq;
|
||||
}
|
||||
|
||||
ldata->rtc = rtc_device_register("pl031", &adev->dev, &pl031_ops,
|
||||
THIS_MODULE);
|
||||
if (IS_ERR(ldata->rtc)) {
|
||||
ret = PTR_ERR(ldata->rtc);
|
||||
goto out_no_rtc;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
out_no_rtc:
|
||||
free_irq(adev->irq[0], ldata->rtc);
|
||||
out_no_irq:
|
||||
iounmap(ldata->base);
|
||||
out_no_remap:
|
||||
dev_set_drvdata(&adev->dev, NULL);
|
||||
kfree(ldata);
|
||||
out:
|
||||
return ret;
|
||||
}
|
||||
|
||||
static struct amba_id pl031_ids[] __initdata = {
|
||||
{
|
||||
.id = 0x00041031,
|
||||
.mask = 0x000fffff, },
|
||||
{0, 0},
|
||||
};
|
||||
|
||||
static struct amba_driver pl031_driver = {
|
||||
.drv = {
|
||||
.name = "rtc-pl031",
|
||||
},
|
||||
.id_table = pl031_ids,
|
||||
.probe = pl031_probe,
|
||||
.remove = pl031_remove,
|
||||
};
|
||||
|
||||
static int __init pl031_init(void)
|
||||
{
|
||||
return amba_driver_register(&pl031_driver);
|
||||
}
|
||||
|
||||
static void __exit pl031_exit(void)
|
||||
{
|
||||
amba_driver_unregister(&pl031_driver);
|
||||
}
|
||||
|
||||
module_init(pl031_init);
|
||||
module_exit(pl031_exit);
|
||||
|
||||
MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net");
|
||||
MODULE_DESCRIPTION("ARM AMBA PL031 RTC Driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
Reference in New Issue
Block a user