mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 18:56:40 +07:00
9cf3b5fa6f
The rtc_device_register() call has changed semantics so that it will immediately call out to rtc_read_alarm() and since the callbacks require the drvdata to be set, we need to set it before the registration call to avoid NULL dereference. Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
325 lines
8.0 KiB
C
325 lines
8.0 KiB
C
/*
|
|
* 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 <linus.walleij@stericsson.com>
|
|
* Based on rtc-pl031.c by Deepak Saxena <dsaxena@plexity.net>
|
|
* Copyright 2006 (c) MontaVista Software, Inc.
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/rtc.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/pm.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/io.h>
|
|
#include <linux/slab.h>
|
|
|
|
/*
|
|
* 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);
|
|
/*
|
|
* Disable the interrupt. This is necessary because
|
|
* the RTC lives on a lower-clocked line and will
|
|
* not release the IRQ line until after a few (slower)
|
|
* clock cycles. The interrupt will be re-enabled when
|
|
* a new alarm is set anyway.
|
|
*/
|
|
writel(0, rtap->virtbase + COH901331_IRQ_MASK);
|
|
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);
|
|
|
|
return 0;
|
|
}
|
|
|
|
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);
|
|
|
|
platform_set_drvdata(pdev, rtap);
|
|
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;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_no_rtc:
|
|
platform_set_drvdata(pdev, NULL);
|
|
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 <linus.walleij@stericsson.com>");
|
|
MODULE_DESCRIPTION("ST-Ericsson AB COH 901 331 RTC Driver");
|
|
MODULE_LICENSE("GPL");
|