/* * Copyright (c) 2011 Zhao Zhang <zhzhl555@gmail.com> * * Derived from driver/rtc/rtc-au1xxx.c * * 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. */ #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, t; v = readl(SYS_TOYREAD0); t = readl(SYS_TOYREAD1); memset(rtm, 0, sizeof(struct rtc_time)); t = mktime((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_time_to_tm(t, rtm); return rtc_valid_tm(rtm); } 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 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; int ret; v = readl(SYS_COUNTER_CNTRL); if (!(v & RTC_CNTR_OK)) { dev_err(&pdev->dev, "rtc counters not working\n"); ret = -ENODEV; goto err; } ret = -ETIMEDOUT; /* 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"); goto err; } 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_device_register(&pdev->dev, "ls1x-rtc", &ls1x_rtc_ops , THIS_MODULE); if (IS_ERR(rtcdev)) { ret = PTR_ERR(rtcdev); goto err; } platform_set_drvdata(pdev, rtcdev); return 0; err: return ret; } 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");