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2874c5fd28
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
193 lines
5.0 KiB
C
193 lines
5.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2011 Zhao Zhang <zhzhl555@gmail.com>
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*
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* Derived from driver/rtc/rtc-au1xxx.c
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/rtc.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/delay.h>
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#include <linux/types.h>
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#include <linux/io.h>
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#include <loongson1.h>
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#define LS1X_RTC_REG_OFFSET (LS1X_RTC_BASE + 0x20)
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#define LS1X_RTC_REGS(x) \
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((void __iomem *)KSEG1ADDR(LS1X_RTC_REG_OFFSET + (x)))
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/*RTC programmable counters 0 and 1*/
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#define SYS_COUNTER_CNTRL (LS1X_RTC_REGS(0x20))
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#define SYS_CNTRL_ERS (1 << 23)
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#define SYS_CNTRL_RTS (1 << 20)
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#define SYS_CNTRL_RM2 (1 << 19)
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#define SYS_CNTRL_RM1 (1 << 18)
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#define SYS_CNTRL_RM0 (1 << 17)
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#define SYS_CNTRL_RS (1 << 16)
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#define SYS_CNTRL_BP (1 << 14)
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#define SYS_CNTRL_REN (1 << 13)
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#define SYS_CNTRL_BRT (1 << 12)
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#define SYS_CNTRL_TEN (1 << 11)
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#define SYS_CNTRL_BTT (1 << 10)
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#define SYS_CNTRL_E0 (1 << 8)
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#define SYS_CNTRL_ETS (1 << 7)
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#define SYS_CNTRL_32S (1 << 5)
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#define SYS_CNTRL_TTS (1 << 4)
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#define SYS_CNTRL_TM2 (1 << 3)
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#define SYS_CNTRL_TM1 (1 << 2)
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#define SYS_CNTRL_TM0 (1 << 1)
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#define SYS_CNTRL_TS (1 << 0)
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/* Programmable Counter 0 Registers */
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#define SYS_TOYTRIM (LS1X_RTC_REGS(0))
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#define SYS_TOYWRITE0 (LS1X_RTC_REGS(4))
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#define SYS_TOYWRITE1 (LS1X_RTC_REGS(8))
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#define SYS_TOYREAD0 (LS1X_RTC_REGS(0xC))
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#define SYS_TOYREAD1 (LS1X_RTC_REGS(0x10))
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#define SYS_TOYMATCH0 (LS1X_RTC_REGS(0x14))
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#define SYS_TOYMATCH1 (LS1X_RTC_REGS(0x18))
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#define SYS_TOYMATCH2 (LS1X_RTC_REGS(0x1C))
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/* Programmable Counter 1 Registers */
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#define SYS_RTCTRIM (LS1X_RTC_REGS(0x40))
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#define SYS_RTCWRITE0 (LS1X_RTC_REGS(0x44))
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#define SYS_RTCREAD0 (LS1X_RTC_REGS(0x48))
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#define SYS_RTCMATCH0 (LS1X_RTC_REGS(0x4C))
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#define SYS_RTCMATCH1 (LS1X_RTC_REGS(0x50))
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#define SYS_RTCMATCH2 (LS1X_RTC_REGS(0x54))
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#define LS1X_SEC_OFFSET (4)
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#define LS1X_MIN_OFFSET (10)
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#define LS1X_HOUR_OFFSET (16)
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#define LS1X_DAY_OFFSET (21)
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#define LS1X_MONTH_OFFSET (26)
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#define LS1X_SEC_MASK (0x3f)
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#define LS1X_MIN_MASK (0x3f)
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#define LS1X_HOUR_MASK (0x1f)
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#define LS1X_DAY_MASK (0x1f)
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#define LS1X_MONTH_MASK (0x3f)
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#define LS1X_YEAR_MASK (0xffffffff)
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#define ls1x_get_sec(t) (((t) >> LS1X_SEC_OFFSET) & LS1X_SEC_MASK)
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#define ls1x_get_min(t) (((t) >> LS1X_MIN_OFFSET) & LS1X_MIN_MASK)
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#define ls1x_get_hour(t) (((t) >> LS1X_HOUR_OFFSET) & LS1X_HOUR_MASK)
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#define ls1x_get_day(t) (((t) >> LS1X_DAY_OFFSET) & LS1X_DAY_MASK)
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#define ls1x_get_month(t) (((t) >> LS1X_MONTH_OFFSET) & LS1X_MONTH_MASK)
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#define RTC_CNTR_OK (SYS_CNTRL_E0 | SYS_CNTRL_32S)
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static int ls1x_rtc_read_time(struct device *dev, struct rtc_time *rtm)
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{
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unsigned long v;
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time64_t t;
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v = readl(SYS_TOYREAD0);
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t = readl(SYS_TOYREAD1);
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memset(rtm, 0, sizeof(struct rtc_time));
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t = mktime64((t & LS1X_YEAR_MASK), ls1x_get_month(v),
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ls1x_get_day(v), ls1x_get_hour(v),
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ls1x_get_min(v), ls1x_get_sec(v));
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rtc_time64_to_tm(t, rtm);
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return 0;
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}
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static int ls1x_rtc_set_time(struct device *dev, struct rtc_time *rtm)
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{
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unsigned long v, t, c;
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int ret = -ETIMEDOUT;
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v = ((rtm->tm_mon + 1) << LS1X_MONTH_OFFSET)
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| (rtm->tm_mday << LS1X_DAY_OFFSET)
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| (rtm->tm_hour << LS1X_HOUR_OFFSET)
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| (rtm->tm_min << LS1X_MIN_OFFSET)
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| (rtm->tm_sec << LS1X_SEC_OFFSET);
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writel(v, SYS_TOYWRITE0);
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c = 0x10000;
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/* add timeout check counter, for more safe */
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while ((readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_TS) && --c)
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usleep_range(1000, 3000);
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if (!c) {
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dev_err(dev, "set time timeout!\n");
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goto err;
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}
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t = rtm->tm_year + 1900;
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writel(t, SYS_TOYWRITE1);
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c = 0x10000;
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while ((readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_TS) && --c)
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usleep_range(1000, 3000);
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if (!c) {
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dev_err(dev, "set time timeout!\n");
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goto err;
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}
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return 0;
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err:
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return ret;
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}
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static const struct rtc_class_ops ls1x_rtc_ops = {
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.read_time = ls1x_rtc_read_time,
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.set_time = ls1x_rtc_set_time,
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};
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static int ls1x_rtc_probe(struct platform_device *pdev)
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{
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struct rtc_device *rtcdev;
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unsigned long v;
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v = readl(SYS_COUNTER_CNTRL);
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if (!(v & RTC_CNTR_OK)) {
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dev_err(&pdev->dev, "rtc counters not working\n");
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return -ENODEV;
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}
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/* set to 1 HZ if needed */
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if (readl(SYS_TOYTRIM) != 32767) {
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v = 0x100000;
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while ((readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_TTS) && --v)
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usleep_range(1000, 3000);
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if (!v) {
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dev_err(&pdev->dev, "time out\n");
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return -ETIMEDOUT;
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}
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writel(32767, SYS_TOYTRIM);
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}
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/* this loop coundn't be endless */
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while (readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_TTS)
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usleep_range(1000, 3000);
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rtcdev = devm_rtc_allocate_device(&pdev->dev);
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if (IS_ERR(rtcdev))
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return PTR_ERR(rtcdev);
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platform_set_drvdata(pdev, rtcdev);
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rtcdev->ops = &ls1x_rtc_ops;
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rtcdev->range_min = RTC_TIMESTAMP_BEGIN_1900;
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rtcdev->range_max = RTC_TIMESTAMP_END_2099;
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return rtc_register_device(rtcdev);
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}
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static struct platform_driver ls1x_rtc_driver = {
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.driver = {
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.name = "ls1x-rtc",
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},
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.probe = ls1x_rtc_probe,
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};
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module_platform_driver(ls1x_rtc_driver);
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MODULE_AUTHOR("zhao zhang <zhzhl555@gmail.com>");
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MODULE_LICENSE("GPL");
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