mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
![Uwe Kleine-König](/assets/img/avatar_default.png)
All amba drivers return 0 in their remove callback. Together with the driver core ignoring the return value anyhow, it doesn't make sense to return a value here. Change the remove prototype to return void, which makes it explicit that returning an error value doesn't work as expected. This simplifies changing the core remove callback to return void, too. Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Acked-by: Krzysztof Kozlowski <krzk@kernel.org> # for drivers/memory Acked-by: Mark Brown <broonie@kernel.org> Acked-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Suzuki K Poulose <suzuki.poulose@arm.com> # for hwtracing/coresight Acked-By: Vinod Koul <vkoul@kernel.org> # for dmaengine Acked-by: Guenter Roeck <linux@roeck-us.net> # for watchdog Acked-by: Wolfram Sang <wsa@kernel.org> # for I2C Acked-by: Takashi Iwai <tiwai@suse.de> # for sound Acked-by: Vladimir Zapolskiy <vz@mleia.com> # for memory/pl172 Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Link: https://lore.kernel.org/r/20210126165835.687514-5-u.kleine-koenig@pengutronix.de Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
174 lines
3.5 KiB
C
174 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* linux/drivers/rtc/rtc-pl030.c
|
|
*
|
|
* Copyright (C) 2000-2001 Deep Blue Solutions Ltd.
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/rtc.h>
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/amba/bus.h>
|
|
#include <linux/io.h>
|
|
#include <linux/slab.h>
|
|
|
|
#define RTC_DR (0)
|
|
#define RTC_MR (4)
|
|
#define RTC_STAT (8)
|
|
#define RTC_EOI (8)
|
|
#define RTC_LR (12)
|
|
#define RTC_CR (16)
|
|
#define RTC_CR_MIE (1 << 0)
|
|
|
|
struct pl030_rtc {
|
|
struct rtc_device *rtc;
|
|
void __iomem *base;
|
|
};
|
|
|
|
static irqreturn_t pl030_interrupt(int irq, void *dev_id)
|
|
{
|
|
struct pl030_rtc *rtc = dev_id;
|
|
writel(0, rtc->base + RTC_EOI);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int pl030_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
|
|
{
|
|
struct pl030_rtc *rtc = dev_get_drvdata(dev);
|
|
|
|
rtc_time64_to_tm(readl(rtc->base + RTC_MR), &alrm->time);
|
|
return 0;
|
|
}
|
|
|
|
static int pl030_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
|
|
{
|
|
struct pl030_rtc *rtc = dev_get_drvdata(dev);
|
|
|
|
writel(rtc_tm_to_time64(&alrm->time), rtc->base + RTC_MR);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pl030_read_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
struct pl030_rtc *rtc = dev_get_drvdata(dev);
|
|
|
|
rtc_time64_to_tm(readl(rtc->base + RTC_DR), tm);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Set the RTC time. Unfortunately, we can't accurately set
|
|
* the point at which the counter updates.
|
|
*
|
|
* Also, since RTC_LR is transferred to RTC_CR on next rising
|
|
* edge of the 1Hz clock, we must write the time one second
|
|
* in advance.
|
|
*/
|
|
static int pl030_set_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
struct pl030_rtc *rtc = dev_get_drvdata(dev);
|
|
|
|
writel(rtc_tm_to_time64(tm) + 1, rtc->base + RTC_LR);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct rtc_class_ops pl030_ops = {
|
|
.read_time = pl030_read_time,
|
|
.set_time = pl030_set_time,
|
|
.read_alarm = pl030_read_alarm,
|
|
.set_alarm = pl030_set_alarm,
|
|
};
|
|
|
|
static int pl030_probe(struct amba_device *dev, const struct amba_id *id)
|
|
{
|
|
struct pl030_rtc *rtc;
|
|
int ret;
|
|
|
|
ret = amba_request_regions(dev, NULL);
|
|
if (ret)
|
|
goto err_req;
|
|
|
|
rtc = devm_kzalloc(&dev->dev, sizeof(*rtc), GFP_KERNEL);
|
|
if (!rtc) {
|
|
ret = -ENOMEM;
|
|
goto err_rtc;
|
|
}
|
|
|
|
rtc->rtc = devm_rtc_allocate_device(&dev->dev);
|
|
if (IS_ERR(rtc->rtc)) {
|
|
ret = PTR_ERR(rtc->rtc);
|
|
goto err_rtc;
|
|
}
|
|
|
|
rtc->rtc->ops = &pl030_ops;
|
|
rtc->rtc->range_max = U32_MAX;
|
|
rtc->base = ioremap(dev->res.start, resource_size(&dev->res));
|
|
if (!rtc->base) {
|
|
ret = -ENOMEM;
|
|
goto err_rtc;
|
|
}
|
|
|
|
__raw_writel(0, rtc->base + RTC_CR);
|
|
__raw_writel(0, rtc->base + RTC_EOI);
|
|
|
|
amba_set_drvdata(dev, rtc);
|
|
|
|
ret = request_irq(dev->irq[0], pl030_interrupt, 0,
|
|
"rtc-pl030", rtc);
|
|
if (ret)
|
|
goto err_irq;
|
|
|
|
ret = devm_rtc_register_device(rtc->rtc);
|
|
if (ret)
|
|
goto err_reg;
|
|
|
|
return 0;
|
|
|
|
err_reg:
|
|
free_irq(dev->irq[0], rtc);
|
|
err_irq:
|
|
iounmap(rtc->base);
|
|
err_rtc:
|
|
amba_release_regions(dev);
|
|
err_req:
|
|
return ret;
|
|
}
|
|
|
|
static void pl030_remove(struct amba_device *dev)
|
|
{
|
|
struct pl030_rtc *rtc = amba_get_drvdata(dev);
|
|
|
|
writel(0, rtc->base + RTC_CR);
|
|
|
|
free_irq(dev->irq[0], rtc);
|
|
iounmap(rtc->base);
|
|
amba_release_regions(dev);
|
|
}
|
|
|
|
static struct amba_id pl030_ids[] = {
|
|
{
|
|
.id = 0x00041030,
|
|
.mask = 0x000fffff,
|
|
},
|
|
{ 0, 0 },
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(amba, pl030_ids);
|
|
|
|
static struct amba_driver pl030_driver = {
|
|
.drv = {
|
|
.name = "rtc-pl030",
|
|
},
|
|
.probe = pl030_probe,
|
|
.remove = pl030_remove,
|
|
.id_table = pl030_ids,
|
|
};
|
|
|
|
module_amba_driver(pl030_driver);
|
|
|
|
MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
|
|
MODULE_DESCRIPTION("ARM AMBA PL030 RTC Driver");
|
|
MODULE_LICENSE("GPL");
|