faac910201
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, ...)
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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>
281 lines
7.6 KiB
C
281 lines
7.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* drivers/rtc/rtc-vt8500.c
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*
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* Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
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*
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* Based on rtc-pxa.c
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*/
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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/interrupt.h>
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#include <linux/io.h>
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#include <linux/bcd.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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/*
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* Register definitions
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*/
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#define VT8500_RTC_TS 0x00 /* Time set */
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#define VT8500_RTC_DS 0x04 /* Date set */
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#define VT8500_RTC_AS 0x08 /* Alarm set */
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#define VT8500_RTC_CR 0x0c /* Control */
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#define VT8500_RTC_TR 0x10 /* Time read */
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#define VT8500_RTC_DR 0x14 /* Date read */
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#define VT8500_RTC_WS 0x18 /* Write status */
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#define VT8500_RTC_CL 0x20 /* Calibration */
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#define VT8500_RTC_IS 0x24 /* Interrupt status */
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#define VT8500_RTC_ST 0x28 /* Status */
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#define INVALID_TIME_BIT (1 << 31)
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#define DATE_CENTURY_S 19
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#define DATE_YEAR_S 11
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#define DATE_YEAR_MASK (0xff << DATE_YEAR_S)
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#define DATE_MONTH_S 6
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#define DATE_MONTH_MASK (0x1f << DATE_MONTH_S)
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#define DATE_DAY_MASK 0x3f
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#define TIME_DOW_S 20
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#define TIME_DOW_MASK (0x07 << TIME_DOW_S)
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#define TIME_HOUR_S 14
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#define TIME_HOUR_MASK (0x3f << TIME_HOUR_S)
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#define TIME_MIN_S 7
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#define TIME_MIN_MASK (0x7f << TIME_MIN_S)
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#define TIME_SEC_MASK 0x7f
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#define ALARM_DAY_S 20
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#define ALARM_DAY_MASK (0x3f << ALARM_DAY_S)
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#define ALARM_DAY_BIT (1 << 29)
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#define ALARM_HOUR_BIT (1 << 28)
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#define ALARM_MIN_BIT (1 << 27)
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#define ALARM_SEC_BIT (1 << 26)
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#define ALARM_ENABLE_MASK (ALARM_DAY_BIT \
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| ALARM_HOUR_BIT \
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| ALARM_MIN_BIT \
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| ALARM_SEC_BIT)
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#define VT8500_RTC_CR_ENABLE (1 << 0) /* Enable RTC */
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#define VT8500_RTC_CR_12H (1 << 1) /* 12h time format */
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#define VT8500_RTC_CR_SM_ENABLE (1 << 2) /* Enable periodic irqs */
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#define VT8500_RTC_CR_SM_SEC (1 << 3) /* 0: 1Hz/60, 1: 1Hz */
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#define VT8500_RTC_CR_CALIB (1 << 4) /* Enable calibration */
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#define VT8500_RTC_IS_ALARM (1 << 0) /* Alarm interrupt status */
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struct vt8500_rtc {
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void __iomem *regbase;
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int irq_alarm;
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struct rtc_device *rtc;
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spinlock_t lock; /* Protects this structure */
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};
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static irqreturn_t vt8500_rtc_irq(int irq, void *dev_id)
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{
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struct vt8500_rtc *vt8500_rtc = dev_id;
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u32 isr;
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unsigned long events = 0;
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spin_lock(&vt8500_rtc->lock);
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/* clear interrupt sources */
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isr = readl(vt8500_rtc->regbase + VT8500_RTC_IS);
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writel(isr, vt8500_rtc->regbase + VT8500_RTC_IS);
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spin_unlock(&vt8500_rtc->lock);
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if (isr & VT8500_RTC_IS_ALARM)
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events |= RTC_AF | RTC_IRQF;
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rtc_update_irq(vt8500_rtc->rtc, 1, events);
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return IRQ_HANDLED;
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}
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static int vt8500_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev);
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u32 date, time;
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date = readl(vt8500_rtc->regbase + VT8500_RTC_DR);
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time = readl(vt8500_rtc->regbase + VT8500_RTC_TR);
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tm->tm_sec = bcd2bin(time & TIME_SEC_MASK);
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tm->tm_min = bcd2bin((time & TIME_MIN_MASK) >> TIME_MIN_S);
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tm->tm_hour = bcd2bin((time & TIME_HOUR_MASK) >> TIME_HOUR_S);
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tm->tm_mday = bcd2bin(date & DATE_DAY_MASK);
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tm->tm_mon = bcd2bin((date & DATE_MONTH_MASK) >> DATE_MONTH_S) - 1;
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tm->tm_year = bcd2bin((date & DATE_YEAR_MASK) >> DATE_YEAR_S)
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+ ((date >> DATE_CENTURY_S) & 1 ? 200 : 100);
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tm->tm_wday = (time & TIME_DOW_MASK) >> TIME_DOW_S;
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return 0;
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}
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static int vt8500_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev);
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if (tm->tm_year < 100) {
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dev_warn(dev, "Only years 2000-2199 are supported by the "
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"hardware!\n");
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return -EINVAL;
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}
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writel((bin2bcd(tm->tm_year % 100) << DATE_YEAR_S)
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| (bin2bcd(tm->tm_mon + 1) << DATE_MONTH_S)
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| (bin2bcd(tm->tm_mday))
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| ((tm->tm_year >= 200) << DATE_CENTURY_S),
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vt8500_rtc->regbase + VT8500_RTC_DS);
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writel((bin2bcd(tm->tm_wday) << TIME_DOW_S)
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| (bin2bcd(tm->tm_hour) << TIME_HOUR_S)
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| (bin2bcd(tm->tm_min) << TIME_MIN_S)
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| (bin2bcd(tm->tm_sec)),
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vt8500_rtc->regbase + VT8500_RTC_TS);
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return 0;
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}
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static int vt8500_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev);
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u32 isr, alarm;
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alarm = readl(vt8500_rtc->regbase + VT8500_RTC_AS);
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isr = readl(vt8500_rtc->regbase + VT8500_RTC_IS);
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alrm->time.tm_mday = bcd2bin((alarm & ALARM_DAY_MASK) >> ALARM_DAY_S);
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alrm->time.tm_hour = bcd2bin((alarm & TIME_HOUR_MASK) >> TIME_HOUR_S);
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alrm->time.tm_min = bcd2bin((alarm & TIME_MIN_MASK) >> TIME_MIN_S);
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alrm->time.tm_sec = bcd2bin((alarm & TIME_SEC_MASK));
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alrm->enabled = (alarm & ALARM_ENABLE_MASK) ? 1 : 0;
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alrm->pending = (isr & VT8500_RTC_IS_ALARM) ? 1 : 0;
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return rtc_valid_tm(&alrm->time);
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}
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static int vt8500_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev);
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writel((alrm->enabled ? ALARM_ENABLE_MASK : 0)
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| (bin2bcd(alrm->time.tm_mday) << ALARM_DAY_S)
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| (bin2bcd(alrm->time.tm_hour) << TIME_HOUR_S)
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| (bin2bcd(alrm->time.tm_min) << TIME_MIN_S)
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| (bin2bcd(alrm->time.tm_sec)),
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vt8500_rtc->regbase + VT8500_RTC_AS);
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return 0;
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}
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static int vt8500_alarm_irq_enable(struct device *dev, unsigned int enabled)
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{
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struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev);
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unsigned long tmp = readl(vt8500_rtc->regbase + VT8500_RTC_AS);
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if (enabled)
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tmp |= ALARM_ENABLE_MASK;
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else
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tmp &= ~ALARM_ENABLE_MASK;
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writel(tmp, vt8500_rtc->regbase + VT8500_RTC_AS);
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return 0;
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}
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static const struct rtc_class_ops vt8500_rtc_ops = {
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.read_time = vt8500_rtc_read_time,
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.set_time = vt8500_rtc_set_time,
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.read_alarm = vt8500_rtc_read_alarm,
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.set_alarm = vt8500_rtc_set_alarm,
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.alarm_irq_enable = vt8500_alarm_irq_enable,
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};
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static int vt8500_rtc_probe(struct platform_device *pdev)
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{
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struct vt8500_rtc *vt8500_rtc;
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struct resource *res;
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int ret;
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vt8500_rtc = devm_kzalloc(&pdev->dev,
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sizeof(struct vt8500_rtc), GFP_KERNEL);
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if (!vt8500_rtc)
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return -ENOMEM;
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spin_lock_init(&vt8500_rtc->lock);
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platform_set_drvdata(pdev, vt8500_rtc);
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vt8500_rtc->irq_alarm = platform_get_irq(pdev, 0);
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if (vt8500_rtc->irq_alarm < 0)
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return vt8500_rtc->irq_alarm;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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vt8500_rtc->regbase = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(vt8500_rtc->regbase))
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return PTR_ERR(vt8500_rtc->regbase);
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/* Enable RTC and set it to 24-hour mode */
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writel(VT8500_RTC_CR_ENABLE,
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vt8500_rtc->regbase + VT8500_RTC_CR);
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vt8500_rtc->rtc = devm_rtc_device_register(&pdev->dev, "vt8500-rtc",
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&vt8500_rtc_ops, THIS_MODULE);
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if (IS_ERR(vt8500_rtc->rtc)) {
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ret = PTR_ERR(vt8500_rtc->rtc);
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dev_err(&pdev->dev,
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"Failed to register RTC device -> %d\n", ret);
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goto err_return;
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}
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ret = devm_request_irq(&pdev->dev, vt8500_rtc->irq_alarm,
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vt8500_rtc_irq, 0, "rtc alarm", vt8500_rtc);
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if (ret < 0) {
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dev_err(&pdev->dev, "can't get irq %i, err %d\n",
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vt8500_rtc->irq_alarm, ret);
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goto err_return;
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}
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return 0;
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err_return:
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return ret;
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}
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static int vt8500_rtc_remove(struct platform_device *pdev)
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{
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struct vt8500_rtc *vt8500_rtc = platform_get_drvdata(pdev);
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/* Disable alarm matching */
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writel(0, vt8500_rtc->regbase + VT8500_RTC_IS);
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return 0;
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}
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static const struct of_device_id wmt_dt_ids[] = {
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{ .compatible = "via,vt8500-rtc", },
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{}
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};
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MODULE_DEVICE_TABLE(of, wmt_dt_ids);
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static struct platform_driver vt8500_rtc_driver = {
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.probe = vt8500_rtc_probe,
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.remove = vt8500_rtc_remove,
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.driver = {
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.name = "vt8500-rtc",
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.of_match_table = wmt_dt_ids,
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},
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};
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module_platform_driver(vt8500_rtc_driver);
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MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
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MODULE_DESCRIPTION("VIA VT8500 SoC Realtime Clock Driver (RTC)");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:vt8500-rtc");
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