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linux/drivers/rtc/rtc-pxa.c
Uwe Kleine-König e288cfe8f2 rtc: pxa: Convert to platform remove callback returning void 
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.

To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20231002080529.2535610-12-u.kleine-koenig@pengutronix.de
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2023-10-13 12:29:08 +02:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Real Time Clock interface for XScale PXA27x and PXA3xx
*
* Copyright (C) 2008 Robert Jarzmik
*/
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/rtc.h>
#include <linux/seq_file.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/of.h>
#include "rtc-sa1100.h"
#define RTC_DEF_DIVIDER (32768 - 1)
#define RTC_DEF_TRIM 0
#define MAXFREQ_PERIODIC 1000
/*
* PXA Registers and bits definitions
*/
#define RTSR_PICE (1 << 15) /* Periodic interrupt count enable */
#define RTSR_PIALE (1 << 14) /* Periodic interrupt Alarm enable */
#define RTSR_PIAL (1 << 13) /* Periodic interrupt detected */
#define RTSR_SWALE2 (1 << 11) /* RTC stopwatch alarm2 enable */
#define RTSR_SWAL2 (1 << 10) /* RTC stopwatch alarm2 detected */
#define RTSR_SWALE1 (1 << 9) /* RTC stopwatch alarm1 enable */
#define RTSR_SWAL1 (1 << 8) /* RTC stopwatch alarm1 detected */
#define RTSR_RDALE2 (1 << 7) /* RTC alarm2 enable */
#define RTSR_RDAL2 (1 << 6) /* RTC alarm2 detected */
#define RTSR_RDALE1 (1 << 5) /* RTC alarm1 enable */
#define RTSR_RDAL1 (1 << 4) /* RTC alarm1 detected */
#define RTSR_HZE (1 << 3) /* HZ interrupt enable */
#define RTSR_ALE (1 << 2) /* RTC alarm interrupt enable */
#define RTSR_HZ (1 << 1) /* HZ rising-edge detected */
#define RTSR_AL (1 << 0) /* RTC alarm detected */
#define RTSR_TRIG_MASK (RTSR_AL | RTSR_HZ | RTSR_RDAL1 | RTSR_RDAL2\
| RTSR_SWAL1 | RTSR_SWAL2)
#define RYxR_YEAR_S 9
#define RYxR_YEAR_MASK (0xfff << RYxR_YEAR_S)
#define RYxR_MONTH_S 5
#define RYxR_MONTH_MASK (0xf << RYxR_MONTH_S)
#define RYxR_DAY_MASK 0x1f
#define RDxR_WOM_S 20
#define RDxR_WOM_MASK (0x7 << RDxR_WOM_S)
#define RDxR_DOW_S 17
#define RDxR_DOW_MASK (0x7 << RDxR_DOW_S)
#define RDxR_HOUR_S 12
#define RDxR_HOUR_MASK (0x1f << RDxR_HOUR_S)
#define RDxR_MIN_S 6
#define RDxR_MIN_MASK (0x3f << RDxR_MIN_S)
#define RDxR_SEC_MASK 0x3f
#define RTSR 0x08
#define RTTR 0x0c
#define RDCR 0x10
#define RYCR 0x14
#define RDAR1 0x18
#define RYAR1 0x1c
#define RTCPICR 0x34
#define PIAR 0x38
#define rtc_readl(pxa_rtc, reg) \
__raw_readl((pxa_rtc)->base + (reg))
#define rtc_writel(pxa_rtc, reg, value) \
__raw_writel((value), (pxa_rtc)->base + (reg))
struct pxa_rtc {
struct sa1100_rtc sa1100_rtc;
struct resource *ress;
void __iomem *base;
struct rtc_device *rtc;
spinlock_t lock; /* Protects this structure */
};
static u32 ryxr_calc(struct rtc_time *tm)
{
return ((tm->tm_year + 1900) << RYxR_YEAR_S)
| ((tm->tm_mon + 1) << RYxR_MONTH_S)
| tm->tm_mday;
}
static u32 rdxr_calc(struct rtc_time *tm)
{
return ((((tm->tm_mday + 6) / 7) << RDxR_WOM_S) & RDxR_WOM_MASK)
| (((tm->tm_wday + 1) << RDxR_DOW_S) & RDxR_DOW_MASK)
| (tm->tm_hour << RDxR_HOUR_S)
| (tm->tm_min << RDxR_MIN_S)
| tm->tm_sec;
}
static void tm_calc(u32 rycr, u32 rdcr, struct rtc_time *tm)
{
tm->tm_year = ((rycr & RYxR_YEAR_MASK) >> RYxR_YEAR_S) - 1900;
tm->tm_mon = (((rycr & RYxR_MONTH_MASK) >> RYxR_MONTH_S)) - 1;
tm->tm_mday = (rycr & RYxR_DAY_MASK);
tm->tm_wday = ((rycr & RDxR_DOW_MASK) >> RDxR_DOW_S) - 1;
tm->tm_hour = (rdcr & RDxR_HOUR_MASK) >> RDxR_HOUR_S;
tm->tm_min = (rdcr & RDxR_MIN_MASK) >> RDxR_MIN_S;
tm->tm_sec = rdcr & RDxR_SEC_MASK;
}
static void rtsr_clear_bits(struct pxa_rtc *pxa_rtc, u32 mask)
{
u32 rtsr;
rtsr = rtc_readl(pxa_rtc, RTSR);
rtsr &= ~RTSR_TRIG_MASK;
rtsr &= ~mask;
rtc_writel(pxa_rtc, RTSR, rtsr);
}
static void rtsr_set_bits(struct pxa_rtc *pxa_rtc, u32 mask)
{
u32 rtsr;
rtsr = rtc_readl(pxa_rtc, RTSR);
rtsr &= ~RTSR_TRIG_MASK;
rtsr |= mask;
rtc_writel(pxa_rtc, RTSR, rtsr);
}
static irqreturn_t pxa_rtc_irq(int irq, void *dev_id)
{
struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev_id);
u32 rtsr;
unsigned long events = 0;
spin_lock(&pxa_rtc->lock);
/* clear interrupt sources */
rtsr = rtc_readl(pxa_rtc, RTSR);
rtc_writel(pxa_rtc, RTSR, rtsr);
/* temporary disable rtc interrupts */
rtsr_clear_bits(pxa_rtc, RTSR_RDALE1 | RTSR_PIALE | RTSR_HZE);
/* clear alarm interrupt if it has occurred */
if (rtsr & RTSR_RDAL1)
rtsr &= ~RTSR_RDALE1;
/* update irq data & counter */
if (rtsr & RTSR_RDAL1)
events |= RTC_AF | RTC_IRQF;
if (rtsr & RTSR_HZ)
events |= RTC_UF | RTC_IRQF;
if (rtsr & RTSR_PIAL)
events |= RTC_PF | RTC_IRQF;
rtc_update_irq(pxa_rtc->rtc, 1, events);
/* enable back rtc interrupts */
rtc_writel(pxa_rtc, RTSR, rtsr & ~RTSR_TRIG_MASK);
spin_unlock(&pxa_rtc->lock);
return IRQ_HANDLED;
}
static int pxa_rtc_open(struct device *dev)
{
struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
int ret;
ret = request_irq(pxa_rtc->sa1100_rtc.irq_1hz, pxa_rtc_irq, 0,
"rtc 1Hz", dev);
if (ret < 0) {
dev_err(dev, "can't get irq %i, err %d\n",
pxa_rtc->sa1100_rtc.irq_1hz, ret);
goto err_irq_1Hz;
}
ret = request_irq(pxa_rtc->sa1100_rtc.irq_alarm, pxa_rtc_irq, 0,
"rtc Alrm", dev);
if (ret < 0) {
dev_err(dev, "can't get irq %i, err %d\n",
pxa_rtc->sa1100_rtc.irq_alarm, ret);
goto err_irq_Alrm;
}
return 0;
err_irq_Alrm:
free_irq(pxa_rtc->sa1100_rtc.irq_1hz, dev);
err_irq_1Hz:
return ret;
}
static void pxa_rtc_release(struct device *dev)
{
struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
spin_lock_irq(&pxa_rtc->lock);
rtsr_clear_bits(pxa_rtc, RTSR_PIALE | RTSR_RDALE1 | RTSR_HZE);
spin_unlock_irq(&pxa_rtc->lock);
free_irq(pxa_rtc->sa1100_rtc.irq_1hz, dev);
free_irq(pxa_rtc->sa1100_rtc.irq_alarm, dev);
}
static int pxa_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
spin_lock_irq(&pxa_rtc->lock);
if (enabled)
rtsr_set_bits(pxa_rtc, RTSR_RDALE1);
else
rtsr_clear_bits(pxa_rtc, RTSR_RDALE1);
spin_unlock_irq(&pxa_rtc->lock);
return 0;
}
static int pxa_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
u32 rycr, rdcr;
rycr = rtc_readl(pxa_rtc, RYCR);
rdcr = rtc_readl(pxa_rtc, RDCR);
tm_calc(rycr, rdcr, tm);
return 0;
}
static int pxa_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
rtc_writel(pxa_rtc, RYCR, ryxr_calc(tm));
rtc_writel(pxa_rtc, RDCR, rdxr_calc(tm));
return 0;
}
static int pxa_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
u32 rtsr, ryar, rdar;
ryar = rtc_readl(pxa_rtc, RYAR1);
rdar = rtc_readl(pxa_rtc, RDAR1);
tm_calc(ryar, rdar, &alrm->time);
rtsr = rtc_readl(pxa_rtc, RTSR);
alrm->enabled = (rtsr & RTSR_RDALE1) ? 1 : 0;
alrm->pending = (rtsr & RTSR_RDAL1) ? 1 : 0;
return 0;
}
static int pxa_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
u32 rtsr;
spin_lock_irq(&pxa_rtc->lock);
rtc_writel(pxa_rtc, RYAR1, ryxr_calc(&alrm->time));
rtc_writel(pxa_rtc, RDAR1, rdxr_calc(&alrm->time));
rtsr = rtc_readl(pxa_rtc, RTSR);
if (alrm->enabled)
rtsr |= RTSR_RDALE1;
else
rtsr &= ~RTSR_RDALE1;
rtc_writel(pxa_rtc, RTSR, rtsr);
spin_unlock_irq(&pxa_rtc->lock);
return 0;
}
static int pxa_rtc_proc(struct device *dev, struct seq_file *seq)
{
struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
seq_printf(seq, "trim/divider\t: 0x%08x\n", rtc_readl(pxa_rtc, RTTR));
seq_printf(seq, "update_IRQ\t: %s\n",
(rtc_readl(pxa_rtc, RTSR) & RTSR_HZE) ? "yes" : "no");
seq_printf(seq, "periodic_IRQ\t: %s\n",
(rtc_readl(pxa_rtc, RTSR) & RTSR_PIALE) ? "yes" : "no");
seq_printf(seq, "periodic_freq\t: %u\n", rtc_readl(pxa_rtc, PIAR));
return 0;
}
static const struct rtc_class_ops pxa_rtc_ops = {
.read_time = pxa_rtc_read_time,
.set_time = pxa_rtc_set_time,
.read_alarm = pxa_rtc_read_alarm,
.set_alarm = pxa_rtc_set_alarm,
.alarm_irq_enable = pxa_alarm_irq_enable,
.proc = pxa_rtc_proc,
};
static int __init pxa_rtc_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct pxa_rtc *pxa_rtc;
struct sa1100_rtc *sa1100_rtc;
int ret;
pxa_rtc = devm_kzalloc(dev, sizeof(*pxa_rtc), GFP_KERNEL);
if (!pxa_rtc)
return -ENOMEM;
sa1100_rtc = &pxa_rtc->sa1100_rtc;
spin_lock_init(&pxa_rtc->lock);
platform_set_drvdata(pdev, pxa_rtc);
pxa_rtc->ress = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!pxa_rtc->ress) {
dev_err(dev, "No I/O memory resource defined\n");
return -ENXIO;
}
sa1100_rtc->irq_1hz = platform_get_irq(pdev, 0);
if (sa1100_rtc->irq_1hz < 0)
return -ENXIO;
sa1100_rtc->irq_alarm = platform_get_irq(pdev, 1);
if (sa1100_rtc->irq_alarm < 0)
return -ENXIO;
sa1100_rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
if (IS_ERR(sa1100_rtc->rtc))
return PTR_ERR(sa1100_rtc->rtc);
pxa_rtc->base = devm_ioremap(dev, pxa_rtc->ress->start,
resource_size(pxa_rtc->ress));
if (!pxa_rtc->base) {
dev_err(dev, "Unable to map pxa RTC I/O memory\n");
return -ENOMEM;
}
pxa_rtc_open(dev);
sa1100_rtc->rcnr = pxa_rtc->base + 0x0;
sa1100_rtc->rtsr = pxa_rtc->base + 0x8;
sa1100_rtc->rtar = pxa_rtc->base + 0x4;
sa1100_rtc->rttr = pxa_rtc->base + 0xc;
ret = sa1100_rtc_init(pdev, sa1100_rtc);
if (ret) {
dev_err(dev, "Unable to init SA1100 RTC sub-device\n");
return ret;
}
rtsr_clear_bits(pxa_rtc, RTSR_PIALE | RTSR_RDALE1 | RTSR_HZE);
pxa_rtc->rtc = devm_rtc_device_register(&pdev->dev, "pxa-rtc",
&pxa_rtc_ops, THIS_MODULE);
if (IS_ERR(pxa_rtc->rtc)) {
ret = PTR_ERR(pxa_rtc->rtc);
dev_err(dev, "Failed to register RTC device -> %d\n", ret);
return ret;
}
device_init_wakeup(dev, 1);
return 0;
}
static void __exit pxa_rtc_remove(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
pxa_rtc_release(dev);
}
#ifdef CONFIG_OF
static const struct of_device_id pxa_rtc_dt_ids[] = {
{ .compatible = "marvell,pxa-rtc" },
{}
};
MODULE_DEVICE_TABLE(of, pxa_rtc_dt_ids);
#endif
#ifdef CONFIG_PM_SLEEP
static int pxa_rtc_suspend(struct device *dev)
{
struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
if (device_may_wakeup(dev))
enable_irq_wake(pxa_rtc->sa1100_rtc.irq_alarm);
return 0;
}
static int pxa_rtc_resume(struct device *dev)
{
struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
if (device_may_wakeup(dev))
disable_irq_wake(pxa_rtc->sa1100_rtc.irq_alarm);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(pxa_rtc_pm_ops, pxa_rtc_suspend, pxa_rtc_resume);
/*
* pxa_rtc_remove() lives in .exit.text. For drivers registered via
* module_platform_driver_probe() this is ok because they cannot get unbound at
* runtime. So mark the driver struct with __refdata to prevent modpost
* triggering a section mismatch warning.
*/
static struct platform_driver pxa_rtc_driver __refdata = {
.remove_new = __exit_p(pxa_rtc_remove),
.driver = {
.name = "pxa-rtc",
.of_match_table = of_match_ptr(pxa_rtc_dt_ids),
.pm = &pxa_rtc_pm_ops,
},
};
module_platform_driver_probe(pxa_rtc_driver, pxa_rtc_probe);
MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>");
MODULE_DESCRIPTION("PXA27x/PXA3xx Realtime Clock Driver (RTC)");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:pxa-rtc");
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