+++ /dev/null
-// 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");
projects / linux-2.6-microblaze.git / commitdiff