linux-imx

/*

 * 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;

    time64_t t;

​