![Stephen Boyd](/assets/img/avatar_default.png)
We don't need dev_err() messages when platform_get_irq() fails now that platform_get_irq() prints an error message itself when something goes wrong. Let's remove these prints with a simple semantic patch. // <smpl> @@ expression ret; struct platform_device *E; @@ ret = ( platform_get_irq(E, ...) | platform_get_irq_byname(E, ...) ); if ( \( ret < 0 \| ret <= 0 \) ) { ( -if (ret != -EPROBE_DEFER) -{ ... -dev_err(...); -... } | ... -dev_err(...); ) ... } // </smpl> While we're here, remove braces on if statements that only have one statement (manually). Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Alexandre Belloni <alexandre.belloni@bootlin.com> Cc: linux-rtc@vger.kernel.org Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stephen Boyd <swboyd@chromium.org> Link: https://lore.kernel.org/r/20190730181557.90391-40-swboyd@chromium.org Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
497 lines
13 KiB
C
497 lines
13 KiB
C
/*
|
|
* drivers/rtc/rtc-spear.c
|
|
*
|
|
* Copyright (C) 2010 ST Microelectronics
|
|
* Rajeev Kumar<rajeev-dlh.kumar@st.com>
|
|
*
|
|
* This file is licensed under the terms of the GNU General Public
|
|
* License version 2. This program is licensed "as is" without any
|
|
* warranty of any kind, whether express or implied.
|
|
*/
|
|
|
|
#include <linux/bcd.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/init.h>
|
|
#include <linux/io.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/rtc.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/spinlock.h>
|
|
|
|
/* RTC registers */
|
|
#define TIME_REG 0x00
|
|
#define DATE_REG 0x04
|
|
#define ALARM_TIME_REG 0x08
|
|
#define ALARM_DATE_REG 0x0C
|
|
#define CTRL_REG 0x10
|
|
#define STATUS_REG 0x14
|
|
|
|
/* TIME_REG & ALARM_TIME_REG */
|
|
#define SECONDS_UNITS (0xf<<0) /* seconds units position */
|
|
#define SECONDS_TENS (0x7<<4) /* seconds tens position */
|
|
#define MINUTES_UNITS (0xf<<8) /* minutes units position */
|
|
#define MINUTES_TENS (0x7<<12) /* minutes tens position */
|
|
#define HOURS_UNITS (0xf<<16) /* hours units position */
|
|
#define HOURS_TENS (0x3<<20) /* hours tens position */
|
|
|
|
/* DATE_REG & ALARM_DATE_REG */
|
|
#define DAYS_UNITS (0xf<<0) /* days units position */
|
|
#define DAYS_TENS (0x3<<4) /* days tens position */
|
|
#define MONTHS_UNITS (0xf<<8) /* months units position */
|
|
#define MONTHS_TENS (0x1<<12) /* months tens position */
|
|
#define YEARS_UNITS (0xf<<16) /* years units position */
|
|
#define YEARS_TENS (0xf<<20) /* years tens position */
|
|
#define YEARS_HUNDREDS (0xf<<24) /* years hundereds position */
|
|
#define YEARS_MILLENIUMS (0xf<<28) /* years millenium position */
|
|
|
|
/* MASK SHIFT TIME_REG & ALARM_TIME_REG*/
|
|
#define SECOND_SHIFT 0x00 /* seconds units */
|
|
#define MINUTE_SHIFT 0x08 /* minutes units position */
|
|
#define HOUR_SHIFT 0x10 /* hours units position */
|
|
#define MDAY_SHIFT 0x00 /* Month day shift */
|
|
#define MONTH_SHIFT 0x08 /* Month shift */
|
|
#define YEAR_SHIFT 0x10 /* Year shift */
|
|
|
|
#define SECOND_MASK 0x7F
|
|
#define MIN_MASK 0x7F
|
|
#define HOUR_MASK 0x3F
|
|
#define DAY_MASK 0x3F
|
|
#define MONTH_MASK 0x7F
|
|
#define YEAR_MASK 0xFFFF
|
|
|
|
/* date reg equal to time reg, for debug only */
|
|
#define TIME_BYP (1<<9)
|
|
#define INT_ENABLE (1<<31) /* interrupt enable */
|
|
|
|
/* STATUS_REG */
|
|
#define CLK_UNCONNECTED (1<<0)
|
|
#define PEND_WR_TIME (1<<2)
|
|
#define PEND_WR_DATE (1<<3)
|
|
#define LOST_WR_TIME (1<<4)
|
|
#define LOST_WR_DATE (1<<5)
|
|
#define RTC_INT_MASK (1<<31)
|
|
#define STATUS_BUSY (PEND_WR_TIME | PEND_WR_DATE)
|
|
#define STATUS_FAIL (LOST_WR_TIME | LOST_WR_DATE)
|
|
|
|
struct spear_rtc_config {
|
|
struct rtc_device *rtc;
|
|
struct clk *clk;
|
|
spinlock_t lock;
|
|
void __iomem *ioaddr;
|
|
unsigned int irq_wake;
|
|
};
|
|
|
|
static inline void spear_rtc_clear_interrupt(struct spear_rtc_config *config)
|
|
{
|
|
unsigned int val;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&config->lock, flags);
|
|
val = readl(config->ioaddr + STATUS_REG);
|
|
val |= RTC_INT_MASK;
|
|
writel(val, config->ioaddr + STATUS_REG);
|
|
spin_unlock_irqrestore(&config->lock, flags);
|
|
}
|
|
|
|
static inline void spear_rtc_enable_interrupt(struct spear_rtc_config *config)
|
|
{
|
|
unsigned int val;
|
|
|
|
val = readl(config->ioaddr + CTRL_REG);
|
|
if (!(val & INT_ENABLE)) {
|
|
spear_rtc_clear_interrupt(config);
|
|
val |= INT_ENABLE;
|
|
writel(val, config->ioaddr + CTRL_REG);
|
|
}
|
|
}
|
|
|
|
static inline void spear_rtc_disable_interrupt(struct spear_rtc_config *config)
|
|
{
|
|
unsigned int val;
|
|
|
|
val = readl(config->ioaddr + CTRL_REG);
|
|
if (val & INT_ENABLE) {
|
|
val &= ~INT_ENABLE;
|
|
writel(val, config->ioaddr + CTRL_REG);
|
|
}
|
|
}
|
|
|
|
static inline int is_write_complete(struct spear_rtc_config *config)
|
|
{
|
|
int ret = 0;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&config->lock, flags);
|
|
if ((readl(config->ioaddr + STATUS_REG)) & STATUS_FAIL)
|
|
ret = -EIO;
|
|
spin_unlock_irqrestore(&config->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void rtc_wait_not_busy(struct spear_rtc_config *config)
|
|
{
|
|
int status, count = 0;
|
|
unsigned long flags;
|
|
|
|
/* Assuming BUSY may stay active for 80 msec) */
|
|
for (count = 0; count < 80; count++) {
|
|
spin_lock_irqsave(&config->lock, flags);
|
|
status = readl(config->ioaddr + STATUS_REG);
|
|
spin_unlock_irqrestore(&config->lock, flags);
|
|
if ((status & STATUS_BUSY) == 0)
|
|
break;
|
|
/* check status busy, after each msec */
|
|
msleep(1);
|
|
}
|
|
}
|
|
|
|
static irqreturn_t spear_rtc_irq(int irq, void *dev_id)
|
|
{
|
|
struct spear_rtc_config *config = dev_id;
|
|
unsigned long flags, events = 0;
|
|
unsigned int irq_data;
|
|
|
|
spin_lock_irqsave(&config->lock, flags);
|
|
irq_data = readl(config->ioaddr + STATUS_REG);
|
|
spin_unlock_irqrestore(&config->lock, flags);
|
|
|
|
if ((irq_data & RTC_INT_MASK)) {
|
|
spear_rtc_clear_interrupt(config);
|
|
events = RTC_IRQF | RTC_AF;
|
|
rtc_update_irq(config->rtc, 1, events);
|
|
return IRQ_HANDLED;
|
|
} else
|
|
return IRQ_NONE;
|
|
|
|
}
|
|
|
|
static void tm2bcd(struct rtc_time *tm)
|
|
{
|
|
tm->tm_sec = bin2bcd(tm->tm_sec);
|
|
tm->tm_min = bin2bcd(tm->tm_min);
|
|
tm->tm_hour = bin2bcd(tm->tm_hour);
|
|
tm->tm_mday = bin2bcd(tm->tm_mday);
|
|
tm->tm_mon = bin2bcd(tm->tm_mon + 1);
|
|
tm->tm_year = bin2bcd(tm->tm_year);
|
|
}
|
|
|
|
static void bcd2tm(struct rtc_time *tm)
|
|
{
|
|
tm->tm_sec = bcd2bin(tm->tm_sec);
|
|
tm->tm_min = bcd2bin(tm->tm_min);
|
|
tm->tm_hour = bcd2bin(tm->tm_hour);
|
|
tm->tm_mday = bcd2bin(tm->tm_mday);
|
|
tm->tm_mon = bcd2bin(tm->tm_mon) - 1;
|
|
/* epoch == 1900 */
|
|
tm->tm_year = bcd2bin(tm->tm_year);
|
|
}
|
|
|
|
/*
|
|
* spear_rtc_read_time - set the time
|
|
* @dev: rtc device in use
|
|
* @tm: holds date and time
|
|
*
|
|
* This function read time and date. On success it will return 0
|
|
* otherwise -ve error is returned.
|
|
*/
|
|
static int spear_rtc_read_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
struct spear_rtc_config *config = dev_get_drvdata(dev);
|
|
unsigned int time, date;
|
|
|
|
/* we don't report wday/yday/isdst ... */
|
|
rtc_wait_not_busy(config);
|
|
|
|
time = readl(config->ioaddr + TIME_REG);
|
|
date = readl(config->ioaddr + DATE_REG);
|
|
tm->tm_sec = (time >> SECOND_SHIFT) & SECOND_MASK;
|
|
tm->tm_min = (time >> MINUTE_SHIFT) & MIN_MASK;
|
|
tm->tm_hour = (time >> HOUR_SHIFT) & HOUR_MASK;
|
|
tm->tm_mday = (date >> MDAY_SHIFT) & DAY_MASK;
|
|
tm->tm_mon = (date >> MONTH_SHIFT) & MONTH_MASK;
|
|
tm->tm_year = (date >> YEAR_SHIFT) & YEAR_MASK;
|
|
|
|
bcd2tm(tm);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* spear_rtc_set_time - set the time
|
|
* @dev: rtc device in use
|
|
* @tm: holds date and time
|
|
*
|
|
* This function set time and date. On success it will return 0
|
|
* otherwise -ve error is returned.
|
|
*/
|
|
static int spear_rtc_set_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
struct spear_rtc_config *config = dev_get_drvdata(dev);
|
|
unsigned int time, date;
|
|
|
|
tm2bcd(tm);
|
|
|
|
rtc_wait_not_busy(config);
|
|
time = (tm->tm_sec << SECOND_SHIFT) | (tm->tm_min << MINUTE_SHIFT) |
|
|
(tm->tm_hour << HOUR_SHIFT);
|
|
date = (tm->tm_mday << MDAY_SHIFT) | (tm->tm_mon << MONTH_SHIFT) |
|
|
(tm->tm_year << YEAR_SHIFT);
|
|
writel(time, config->ioaddr + TIME_REG);
|
|
writel(date, config->ioaddr + DATE_REG);
|
|
|
|
return is_write_complete(config);
|
|
}
|
|
|
|
/*
|
|
* spear_rtc_read_alarm - read the alarm time
|
|
* @dev: rtc device in use
|
|
* @alm: holds alarm date and time
|
|
*
|
|
* This function read alarm time and date. On success it will return 0
|
|
* otherwise -ve error is returned.
|
|
*/
|
|
static int spear_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
|
|
{
|
|
struct spear_rtc_config *config = dev_get_drvdata(dev);
|
|
unsigned int time, date;
|
|
|
|
rtc_wait_not_busy(config);
|
|
|
|
time = readl(config->ioaddr + ALARM_TIME_REG);
|
|
date = readl(config->ioaddr + ALARM_DATE_REG);
|
|
alm->time.tm_sec = (time >> SECOND_SHIFT) & SECOND_MASK;
|
|
alm->time.tm_min = (time >> MINUTE_SHIFT) & MIN_MASK;
|
|
alm->time.tm_hour = (time >> HOUR_SHIFT) & HOUR_MASK;
|
|
alm->time.tm_mday = (date >> MDAY_SHIFT) & DAY_MASK;
|
|
alm->time.tm_mon = (date >> MONTH_SHIFT) & MONTH_MASK;
|
|
alm->time.tm_year = (date >> YEAR_SHIFT) & YEAR_MASK;
|
|
|
|
bcd2tm(&alm->time);
|
|
alm->enabled = readl(config->ioaddr + CTRL_REG) & INT_ENABLE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* spear_rtc_set_alarm - set the alarm time
|
|
* @dev: rtc device in use
|
|
* @alm: holds alarm date and time
|
|
*
|
|
* This function set alarm time and date. On success it will return 0
|
|
* otherwise -ve error is returned.
|
|
*/
|
|
static int spear_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
|
|
{
|
|
struct spear_rtc_config *config = dev_get_drvdata(dev);
|
|
unsigned int time, date;
|
|
int err;
|
|
|
|
tm2bcd(&alm->time);
|
|
|
|
rtc_wait_not_busy(config);
|
|
|
|
time = (alm->time.tm_sec << SECOND_SHIFT) | (alm->time.tm_min <<
|
|
MINUTE_SHIFT) | (alm->time.tm_hour << HOUR_SHIFT);
|
|
date = (alm->time.tm_mday << MDAY_SHIFT) | (alm->time.tm_mon <<
|
|
MONTH_SHIFT) | (alm->time.tm_year << YEAR_SHIFT);
|
|
|
|
writel(time, config->ioaddr + ALARM_TIME_REG);
|
|
writel(date, config->ioaddr + ALARM_DATE_REG);
|
|
err = is_write_complete(config);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (alm->enabled)
|
|
spear_rtc_enable_interrupt(config);
|
|
else
|
|
spear_rtc_disable_interrupt(config);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int spear_alarm_irq_enable(struct device *dev, unsigned int enabled)
|
|
{
|
|
struct spear_rtc_config *config = dev_get_drvdata(dev);
|
|
int ret = 0;
|
|
|
|
spear_rtc_clear_interrupt(config);
|
|
|
|
switch (enabled) {
|
|
case 0:
|
|
/* alarm off */
|
|
spear_rtc_disable_interrupt(config);
|
|
break;
|
|
case 1:
|
|
/* alarm on */
|
|
spear_rtc_enable_interrupt(config);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct rtc_class_ops spear_rtc_ops = {
|
|
.read_time = spear_rtc_read_time,
|
|
.set_time = spear_rtc_set_time,
|
|
.read_alarm = spear_rtc_read_alarm,
|
|
.set_alarm = spear_rtc_set_alarm,
|
|
.alarm_irq_enable = spear_alarm_irq_enable,
|
|
};
|
|
|
|
static int spear_rtc_probe(struct platform_device *pdev)
|
|
{
|
|
struct resource *res;
|
|
struct spear_rtc_config *config;
|
|
int status = 0;
|
|
int irq;
|
|
|
|
config = devm_kzalloc(&pdev->dev, sizeof(*config), GFP_KERNEL);
|
|
if (!config)
|
|
return -ENOMEM;
|
|
|
|
/* alarm irqs */
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (irq < 0)
|
|
return irq;
|
|
|
|
status = devm_request_irq(&pdev->dev, irq, spear_rtc_irq, 0, pdev->name,
|
|
config);
|
|
if (status) {
|
|
dev_err(&pdev->dev, "Alarm interrupt IRQ%d already claimed\n",
|
|
irq);
|
|
return status;
|
|
}
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
config->ioaddr = devm_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(config->ioaddr))
|
|
return PTR_ERR(config->ioaddr);
|
|
|
|
config->clk = devm_clk_get(&pdev->dev, NULL);
|
|
if (IS_ERR(config->clk))
|
|
return PTR_ERR(config->clk);
|
|
|
|
status = clk_prepare_enable(config->clk);
|
|
if (status < 0)
|
|
return status;
|
|
|
|
spin_lock_init(&config->lock);
|
|
platform_set_drvdata(pdev, config);
|
|
|
|
config->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
|
|
&spear_rtc_ops, THIS_MODULE);
|
|
if (IS_ERR(config->rtc)) {
|
|
dev_err(&pdev->dev, "can't register RTC device, err %ld\n",
|
|
PTR_ERR(config->rtc));
|
|
status = PTR_ERR(config->rtc);
|
|
goto err_disable_clock;
|
|
}
|
|
|
|
config->rtc->uie_unsupported = 1;
|
|
|
|
if (!device_can_wakeup(&pdev->dev))
|
|
device_init_wakeup(&pdev->dev, 1);
|
|
|
|
return 0;
|
|
|
|
err_disable_clock:
|
|
clk_disable_unprepare(config->clk);
|
|
|
|
return status;
|
|
}
|
|
|
|
static int spear_rtc_remove(struct platform_device *pdev)
|
|
{
|
|
struct spear_rtc_config *config = platform_get_drvdata(pdev);
|
|
|
|
spear_rtc_disable_interrupt(config);
|
|
clk_disable_unprepare(config->clk);
|
|
device_init_wakeup(&pdev->dev, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int spear_rtc_suspend(struct device *dev)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct spear_rtc_config *config = platform_get_drvdata(pdev);
|
|
int irq;
|
|
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (device_may_wakeup(&pdev->dev)) {
|
|
if (!enable_irq_wake(irq))
|
|
config->irq_wake = 1;
|
|
} else {
|
|
spear_rtc_disable_interrupt(config);
|
|
clk_disable(config->clk);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int spear_rtc_resume(struct device *dev)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct spear_rtc_config *config = platform_get_drvdata(pdev);
|
|
int irq;
|
|
|
|
irq = platform_get_irq(pdev, 0);
|
|
|
|
if (device_may_wakeup(&pdev->dev)) {
|
|
if (config->irq_wake) {
|
|
disable_irq_wake(irq);
|
|
config->irq_wake = 0;
|
|
}
|
|
} else {
|
|
clk_enable(config->clk);
|
|
spear_rtc_enable_interrupt(config);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(spear_rtc_pm_ops, spear_rtc_suspend, spear_rtc_resume);
|
|
|
|
static void spear_rtc_shutdown(struct platform_device *pdev)
|
|
{
|
|
struct spear_rtc_config *config = platform_get_drvdata(pdev);
|
|
|
|
spear_rtc_disable_interrupt(config);
|
|
clk_disable(config->clk);
|
|
}
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id spear_rtc_id_table[] = {
|
|
{ .compatible = "st,spear600-rtc" },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, spear_rtc_id_table);
|
|
#endif
|
|
|
|
static struct platform_driver spear_rtc_driver = {
|
|
.probe = spear_rtc_probe,
|
|
.remove = spear_rtc_remove,
|
|
.shutdown = spear_rtc_shutdown,
|
|
.driver = {
|
|
.name = "rtc-spear",
|
|
.pm = &spear_rtc_pm_ops,
|
|
.of_match_table = of_match_ptr(spear_rtc_id_table),
|
|
},
|
|
};
|
|
|
|
module_platform_driver(spear_rtc_driver);
|
|
|
|
MODULE_ALIAS("platform:rtc-spear");
|
|
MODULE_AUTHOR("Rajeev Kumar <rajeev-dlh.kumar@st.com>");
|
|
MODULE_DESCRIPTION("ST SPEAr Realtime Clock Driver (RTC)");
|
|
MODULE_LICENSE("GPL");
|