fdcfd85433
rtc_register_device() is a managed interface but it doesn't use devres by itself - instead it marks an rtc_device as "registered" and the devres callback for devm_rtc_allocate_device() takes care of resource release. This doesn't correspond with the design behind devres where managed structures should not be aware of being managed. The correct solution here is to register a separate devres callback for unregistering the device. While at it: rename rtc_register_device() to devm_rtc_register_device() and add it to the list of managed interfaces in devres.rst. This way we can avoid any potential confusion of driver developers who may expect there to exist a corresponding unregister function. Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Link: https://lore.kernel.org/r/20201109163409.24301-8-brgl@bgdev.pl
193 lines
5.0 KiB
C
193 lines
5.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Copyright (c) 2011 Zhao Zhang <zhzhl555@gmail.com>
|
|
*
|
|
* Derived from driver/rtc/rtc-au1xxx.c
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/rtc.h>
|
|
#include <linux/init.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/types.h>
|
|
#include <linux/io.h>
|
|
#include <loongson1.h>
|
|
|
|
#define LS1X_RTC_REG_OFFSET (LS1X_RTC_BASE + 0x20)
|
|
#define LS1X_RTC_REGS(x) \
|
|
((void __iomem *)KSEG1ADDR(LS1X_RTC_REG_OFFSET + (x)))
|
|
|
|
/*RTC programmable counters 0 and 1*/
|
|
#define SYS_COUNTER_CNTRL (LS1X_RTC_REGS(0x20))
|
|
#define SYS_CNTRL_ERS (1 << 23)
|
|
#define SYS_CNTRL_RTS (1 << 20)
|
|
#define SYS_CNTRL_RM2 (1 << 19)
|
|
#define SYS_CNTRL_RM1 (1 << 18)
|
|
#define SYS_CNTRL_RM0 (1 << 17)
|
|
#define SYS_CNTRL_RS (1 << 16)
|
|
#define SYS_CNTRL_BP (1 << 14)
|
|
#define SYS_CNTRL_REN (1 << 13)
|
|
#define SYS_CNTRL_BRT (1 << 12)
|
|
#define SYS_CNTRL_TEN (1 << 11)
|
|
#define SYS_CNTRL_BTT (1 << 10)
|
|
#define SYS_CNTRL_E0 (1 << 8)
|
|
#define SYS_CNTRL_ETS (1 << 7)
|
|
#define SYS_CNTRL_32S (1 << 5)
|
|
#define SYS_CNTRL_TTS (1 << 4)
|
|
#define SYS_CNTRL_TM2 (1 << 3)
|
|
#define SYS_CNTRL_TM1 (1 << 2)
|
|
#define SYS_CNTRL_TM0 (1 << 1)
|
|
#define SYS_CNTRL_TS (1 << 0)
|
|
|
|
/* Programmable Counter 0 Registers */
|
|
#define SYS_TOYTRIM (LS1X_RTC_REGS(0))
|
|
#define SYS_TOYWRITE0 (LS1X_RTC_REGS(4))
|
|
#define SYS_TOYWRITE1 (LS1X_RTC_REGS(8))
|
|
#define SYS_TOYREAD0 (LS1X_RTC_REGS(0xC))
|
|
#define SYS_TOYREAD1 (LS1X_RTC_REGS(0x10))
|
|
#define SYS_TOYMATCH0 (LS1X_RTC_REGS(0x14))
|
|
#define SYS_TOYMATCH1 (LS1X_RTC_REGS(0x18))
|
|
#define SYS_TOYMATCH2 (LS1X_RTC_REGS(0x1C))
|
|
|
|
/* Programmable Counter 1 Registers */
|
|
#define SYS_RTCTRIM (LS1X_RTC_REGS(0x40))
|
|
#define SYS_RTCWRITE0 (LS1X_RTC_REGS(0x44))
|
|
#define SYS_RTCREAD0 (LS1X_RTC_REGS(0x48))
|
|
#define SYS_RTCMATCH0 (LS1X_RTC_REGS(0x4C))
|
|
#define SYS_RTCMATCH1 (LS1X_RTC_REGS(0x50))
|
|
#define SYS_RTCMATCH2 (LS1X_RTC_REGS(0x54))
|
|
|
|
#define LS1X_SEC_OFFSET (4)
|
|
#define LS1X_MIN_OFFSET (10)
|
|
#define LS1X_HOUR_OFFSET (16)
|
|
#define LS1X_DAY_OFFSET (21)
|
|
#define LS1X_MONTH_OFFSET (26)
|
|
|
|
|
|
#define LS1X_SEC_MASK (0x3f)
|
|
#define LS1X_MIN_MASK (0x3f)
|
|
#define LS1X_HOUR_MASK (0x1f)
|
|
#define LS1X_DAY_MASK (0x1f)
|
|
#define LS1X_MONTH_MASK (0x3f)
|
|
#define LS1X_YEAR_MASK (0xffffffff)
|
|
|
|
#define ls1x_get_sec(t) (((t) >> LS1X_SEC_OFFSET) & LS1X_SEC_MASK)
|
|
#define ls1x_get_min(t) (((t) >> LS1X_MIN_OFFSET) & LS1X_MIN_MASK)
|
|
#define ls1x_get_hour(t) (((t) >> LS1X_HOUR_OFFSET) & LS1X_HOUR_MASK)
|
|
#define ls1x_get_day(t) (((t) >> LS1X_DAY_OFFSET) & LS1X_DAY_MASK)
|
|
#define ls1x_get_month(t) (((t) >> LS1X_MONTH_OFFSET) & LS1X_MONTH_MASK)
|
|
|
|
#define RTC_CNTR_OK (SYS_CNTRL_E0 | SYS_CNTRL_32S)
|
|
|
|
static int ls1x_rtc_read_time(struct device *dev, struct rtc_time *rtm)
|
|
{
|
|
unsigned long v;
|
|
time64_t t;
|
|
|
|
v = readl(SYS_TOYREAD0);
|
|
t = readl(SYS_TOYREAD1);
|
|
|
|
memset(rtm, 0, sizeof(struct rtc_time));
|
|
t = mktime64((t & LS1X_YEAR_MASK), ls1x_get_month(v),
|
|
ls1x_get_day(v), ls1x_get_hour(v),
|
|
ls1x_get_min(v), ls1x_get_sec(v));
|
|
rtc_time64_to_tm(t, rtm);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ls1x_rtc_set_time(struct device *dev, struct rtc_time *rtm)
|
|
{
|
|
unsigned long v, t, c;
|
|
int ret = -ETIMEDOUT;
|
|
|
|
v = ((rtm->tm_mon + 1) << LS1X_MONTH_OFFSET)
|
|
| (rtm->tm_mday << LS1X_DAY_OFFSET)
|
|
| (rtm->tm_hour << LS1X_HOUR_OFFSET)
|
|
| (rtm->tm_min << LS1X_MIN_OFFSET)
|
|
| (rtm->tm_sec << LS1X_SEC_OFFSET);
|
|
|
|
writel(v, SYS_TOYWRITE0);
|
|
c = 0x10000;
|
|
/* add timeout check counter, for more safe */
|
|
while ((readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_TS) && --c)
|
|
usleep_range(1000, 3000);
|
|
|
|
if (!c) {
|
|
dev_err(dev, "set time timeout!\n");
|
|
goto err;
|
|
}
|
|
|
|
t = rtm->tm_year + 1900;
|
|
writel(t, SYS_TOYWRITE1);
|
|
c = 0x10000;
|
|
while ((readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_TS) && --c)
|
|
usleep_range(1000, 3000);
|
|
|
|
if (!c) {
|
|
dev_err(dev, "set time timeout!\n");
|
|
goto err;
|
|
}
|
|
return 0;
|
|
err:
|
|
return ret;
|
|
}
|
|
|
|
static const struct rtc_class_ops ls1x_rtc_ops = {
|
|
.read_time = ls1x_rtc_read_time,
|
|
.set_time = ls1x_rtc_set_time,
|
|
};
|
|
|
|
static int ls1x_rtc_probe(struct platform_device *pdev)
|
|
{
|
|
struct rtc_device *rtcdev;
|
|
unsigned long v;
|
|
|
|
v = readl(SYS_COUNTER_CNTRL);
|
|
if (!(v & RTC_CNTR_OK)) {
|
|
dev_err(&pdev->dev, "rtc counters not working\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* set to 1 HZ if needed */
|
|
if (readl(SYS_TOYTRIM) != 32767) {
|
|
v = 0x100000;
|
|
while ((readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_TTS) && --v)
|
|
usleep_range(1000, 3000);
|
|
|
|
if (!v) {
|
|
dev_err(&pdev->dev, "time out\n");
|
|
return -ETIMEDOUT;
|
|
}
|
|
writel(32767, SYS_TOYTRIM);
|
|
}
|
|
/* this loop coundn't be endless */
|
|
while (readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_TTS)
|
|
usleep_range(1000, 3000);
|
|
|
|
rtcdev = devm_rtc_allocate_device(&pdev->dev);
|
|
if (IS_ERR(rtcdev))
|
|
return PTR_ERR(rtcdev);
|
|
|
|
platform_set_drvdata(pdev, rtcdev);
|
|
rtcdev->ops = &ls1x_rtc_ops;
|
|
rtcdev->range_min = RTC_TIMESTAMP_BEGIN_1900;
|
|
rtcdev->range_max = RTC_TIMESTAMP_END_2099;
|
|
|
|
return devm_rtc_register_device(rtcdev);
|
|
}
|
|
|
|
static struct platform_driver ls1x_rtc_driver = {
|
|
.driver = {
|
|
.name = "ls1x-rtc",
|
|
},
|
|
.probe = ls1x_rtc_probe,
|
|
};
|
|
|
|
module_platform_driver(ls1x_rtc_driver);
|
|
|
|
MODULE_AUTHOR("zhao zhang <zhzhl555@gmail.com>");
|
|
MODULE_LICENSE("GPL");
|