592 строки
14 KiB
C
592 строки
14 KiB
C
/*
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* rtc-twl.c -- TWL Real Time Clock interface
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*
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* Copyright (C) 2007 MontaVista Software, Inc
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* Author: Alexandre Rusev <source@mvista.com>
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*
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* Based on original TI driver twl4030-rtc.c
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* Copyright (C) 2006 Texas Instruments, Inc.
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*
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* Based on rtc-omap.c
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* Copyright (C) 2003 MontaVista Software, Inc.
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* Author: George G. Davis <gdavis@mvista.com> or <source@mvista.com>
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* Copyright (C) 2006 David Brownell
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/rtc.h>
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#include <linux/bcd.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/i2c/twl.h>
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/*
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* RTC block register offsets (use TWL_MODULE_RTC)
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*/
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enum {
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REG_SECONDS_REG = 0,
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REG_MINUTES_REG,
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REG_HOURS_REG,
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REG_DAYS_REG,
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REG_MONTHS_REG,
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REG_YEARS_REG,
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REG_WEEKS_REG,
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REG_ALARM_SECONDS_REG,
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REG_ALARM_MINUTES_REG,
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REG_ALARM_HOURS_REG,
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REG_ALARM_DAYS_REG,
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REG_ALARM_MONTHS_REG,
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REG_ALARM_YEARS_REG,
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REG_RTC_CTRL_REG,
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REG_RTC_STATUS_REG,
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REG_RTC_INTERRUPTS_REG,
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REG_RTC_COMP_LSB_REG,
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REG_RTC_COMP_MSB_REG,
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};
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static const u8 twl4030_rtc_reg_map[] = {
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[REG_SECONDS_REG] = 0x00,
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[REG_MINUTES_REG] = 0x01,
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[REG_HOURS_REG] = 0x02,
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[REG_DAYS_REG] = 0x03,
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[REG_MONTHS_REG] = 0x04,
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[REG_YEARS_REG] = 0x05,
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[REG_WEEKS_REG] = 0x06,
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[REG_ALARM_SECONDS_REG] = 0x07,
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[REG_ALARM_MINUTES_REG] = 0x08,
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[REG_ALARM_HOURS_REG] = 0x09,
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[REG_ALARM_DAYS_REG] = 0x0A,
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[REG_ALARM_MONTHS_REG] = 0x0B,
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[REG_ALARM_YEARS_REG] = 0x0C,
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[REG_RTC_CTRL_REG] = 0x0D,
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[REG_RTC_STATUS_REG] = 0x0E,
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[REG_RTC_INTERRUPTS_REG] = 0x0F,
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[REG_RTC_COMP_LSB_REG] = 0x10,
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[REG_RTC_COMP_MSB_REG] = 0x11,
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};
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static const u8 twl6030_rtc_reg_map[] = {
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[REG_SECONDS_REG] = 0x00,
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[REG_MINUTES_REG] = 0x01,
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[REG_HOURS_REG] = 0x02,
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[REG_DAYS_REG] = 0x03,
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[REG_MONTHS_REG] = 0x04,
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[REG_YEARS_REG] = 0x05,
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[REG_WEEKS_REG] = 0x06,
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[REG_ALARM_SECONDS_REG] = 0x08,
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[REG_ALARM_MINUTES_REG] = 0x09,
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[REG_ALARM_HOURS_REG] = 0x0A,
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[REG_ALARM_DAYS_REG] = 0x0B,
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[REG_ALARM_MONTHS_REG] = 0x0C,
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[REG_ALARM_YEARS_REG] = 0x0D,
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[REG_RTC_CTRL_REG] = 0x10,
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[REG_RTC_STATUS_REG] = 0x11,
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[REG_RTC_INTERRUPTS_REG] = 0x12,
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[REG_RTC_COMP_LSB_REG] = 0x13,
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[REG_RTC_COMP_MSB_REG] = 0x14,
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};
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/* RTC_CTRL_REG bitfields */
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#define BIT_RTC_CTRL_REG_STOP_RTC_M 0x01
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#define BIT_RTC_CTRL_REG_ROUND_30S_M 0x02
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#define BIT_RTC_CTRL_REG_AUTO_COMP_M 0x04
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#define BIT_RTC_CTRL_REG_MODE_12_24_M 0x08
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#define BIT_RTC_CTRL_REG_TEST_MODE_M 0x10
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#define BIT_RTC_CTRL_REG_SET_32_COUNTER_M 0x20
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#define BIT_RTC_CTRL_REG_GET_TIME_M 0x40
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/* RTC_STATUS_REG bitfields */
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#define BIT_RTC_STATUS_REG_RUN_M 0x02
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#define BIT_RTC_STATUS_REG_1S_EVENT_M 0x04
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#define BIT_RTC_STATUS_REG_1M_EVENT_M 0x08
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#define BIT_RTC_STATUS_REG_1H_EVENT_M 0x10
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#define BIT_RTC_STATUS_REG_1D_EVENT_M 0x20
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#define BIT_RTC_STATUS_REG_ALARM_M 0x40
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#define BIT_RTC_STATUS_REG_POWER_UP_M 0x80
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/* RTC_INTERRUPTS_REG bitfields */
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#define BIT_RTC_INTERRUPTS_REG_EVERY_M 0x03
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#define BIT_RTC_INTERRUPTS_REG_IT_TIMER_M 0x04
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#define BIT_RTC_INTERRUPTS_REG_IT_ALARM_M 0x08
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/* REG_SECONDS_REG through REG_YEARS_REG is how many registers? */
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#define ALL_TIME_REGS 6
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/*----------------------------------------------------------------------*/
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static u8 *rtc_reg_map;
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/*
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* Supports 1 byte read from TWL RTC register.
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*/
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static int twl_rtc_read_u8(u8 *data, u8 reg)
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{
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int ret;
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ret = twl_i2c_read_u8(TWL_MODULE_RTC, data, (rtc_reg_map[reg]));
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if (ret < 0)
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pr_err("twl_rtc: Could not read TWL"
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"register %X - error %d\n", reg, ret);
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return ret;
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}
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/*
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* Supports 1 byte write to TWL RTC registers.
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*/
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static int twl_rtc_write_u8(u8 data, u8 reg)
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{
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int ret;
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ret = twl_i2c_write_u8(TWL_MODULE_RTC, data, (rtc_reg_map[reg]));
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if (ret < 0)
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pr_err("twl_rtc: Could not write TWL"
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"register %X - error %d\n", reg, ret);
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return ret;
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}
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/*
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* Cache the value for timer/alarm interrupts register; this is
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* only changed by callers holding rtc ops lock (or resume).
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*/
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static unsigned char rtc_irq_bits;
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/*
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* Enable 1/second update and/or alarm interrupts.
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*/
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static int set_rtc_irq_bit(unsigned char bit)
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{
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unsigned char val;
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int ret;
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/* if the bit is set, return from here */
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if (rtc_irq_bits & bit)
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return 0;
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val = rtc_irq_bits | bit;
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val &= ~BIT_RTC_INTERRUPTS_REG_EVERY_M;
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ret = twl_rtc_write_u8(val, REG_RTC_INTERRUPTS_REG);
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if (ret == 0)
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rtc_irq_bits = val;
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return ret;
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}
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/*
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* Disable update and/or alarm interrupts.
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*/
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static int mask_rtc_irq_bit(unsigned char bit)
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{
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unsigned char val;
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int ret;
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/* if the bit is clear, return from here */
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if (!(rtc_irq_bits & bit))
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return 0;
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val = rtc_irq_bits & ~bit;
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ret = twl_rtc_write_u8(val, REG_RTC_INTERRUPTS_REG);
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if (ret == 0)
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rtc_irq_bits = val;
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return ret;
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}
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static int twl_rtc_alarm_irq_enable(struct device *dev, unsigned enabled)
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{
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int ret;
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if (enabled)
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ret = set_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
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else
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ret = mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
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return ret;
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}
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/*
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* Gets current TWL RTC time and date parameters.
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*
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* The RTC's time/alarm representation is not what gmtime(3) requires
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* Linux to use:
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*
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* - Months are 1..12 vs Linux 0-11
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* - Years are 0..99 vs Linux 1900..N (we assume 21st century)
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*/
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static int twl_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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unsigned char rtc_data[ALL_TIME_REGS + 1];
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int ret;
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u8 save_control;
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ret = twl_rtc_read_u8(&save_control, REG_RTC_CTRL_REG);
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if (ret < 0)
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return ret;
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save_control |= BIT_RTC_CTRL_REG_GET_TIME_M;
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ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
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if (ret < 0)
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return ret;
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ret = twl_i2c_read(TWL_MODULE_RTC, rtc_data,
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(rtc_reg_map[REG_SECONDS_REG]), ALL_TIME_REGS);
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if (ret < 0) {
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dev_err(dev, "rtc_read_time error %d\n", ret);
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return ret;
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}
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tm->tm_sec = bcd2bin(rtc_data[0]);
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tm->tm_min = bcd2bin(rtc_data[1]);
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tm->tm_hour = bcd2bin(rtc_data[2]);
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tm->tm_mday = bcd2bin(rtc_data[3]);
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tm->tm_mon = bcd2bin(rtc_data[4]) - 1;
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tm->tm_year = bcd2bin(rtc_data[5]) + 100;
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return ret;
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}
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static int twl_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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unsigned char save_control;
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unsigned char rtc_data[ALL_TIME_REGS + 1];
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int ret;
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rtc_data[1] = bin2bcd(tm->tm_sec);
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rtc_data[2] = bin2bcd(tm->tm_min);
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rtc_data[3] = bin2bcd(tm->tm_hour);
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rtc_data[4] = bin2bcd(tm->tm_mday);
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rtc_data[5] = bin2bcd(tm->tm_mon + 1);
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rtc_data[6] = bin2bcd(tm->tm_year - 100);
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/* Stop RTC while updating the TC registers */
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ret = twl_rtc_read_u8(&save_control, REG_RTC_CTRL_REG);
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if (ret < 0)
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goto out;
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save_control &= ~BIT_RTC_CTRL_REG_STOP_RTC_M;
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ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
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if (ret < 0)
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goto out;
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/* update all the time registers in one shot */
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ret = twl_i2c_write(TWL_MODULE_RTC, rtc_data,
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(rtc_reg_map[REG_SECONDS_REG]), ALL_TIME_REGS);
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if (ret < 0) {
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dev_err(dev, "rtc_set_time error %d\n", ret);
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goto out;
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}
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/* Start back RTC */
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save_control |= BIT_RTC_CTRL_REG_STOP_RTC_M;
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ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
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out:
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return ret;
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}
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/*
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* Gets current TWL RTC alarm time.
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*/
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static int twl_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
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{
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unsigned char rtc_data[ALL_TIME_REGS + 1];
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int ret;
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ret = twl_i2c_read(TWL_MODULE_RTC, rtc_data,
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(rtc_reg_map[REG_ALARM_SECONDS_REG]), ALL_TIME_REGS);
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if (ret < 0) {
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dev_err(dev, "rtc_read_alarm error %d\n", ret);
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return ret;
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}
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/* some of these fields may be wildcard/"match all" */
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alm->time.tm_sec = bcd2bin(rtc_data[0]);
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alm->time.tm_min = bcd2bin(rtc_data[1]);
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alm->time.tm_hour = bcd2bin(rtc_data[2]);
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alm->time.tm_mday = bcd2bin(rtc_data[3]);
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alm->time.tm_mon = bcd2bin(rtc_data[4]) - 1;
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alm->time.tm_year = bcd2bin(rtc_data[5]) + 100;
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/* report cached alarm enable state */
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if (rtc_irq_bits & BIT_RTC_INTERRUPTS_REG_IT_ALARM_M)
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alm->enabled = 1;
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return ret;
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}
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static int twl_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
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{
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unsigned char alarm_data[ALL_TIME_REGS + 1];
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int ret;
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ret = twl_rtc_alarm_irq_enable(dev, 0);
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if (ret)
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goto out;
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alarm_data[1] = bin2bcd(alm->time.tm_sec);
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alarm_data[2] = bin2bcd(alm->time.tm_min);
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alarm_data[3] = bin2bcd(alm->time.tm_hour);
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alarm_data[4] = bin2bcd(alm->time.tm_mday);
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alarm_data[5] = bin2bcd(alm->time.tm_mon + 1);
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alarm_data[6] = bin2bcd(alm->time.tm_year - 100);
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/* update all the alarm registers in one shot */
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ret = twl_i2c_write(TWL_MODULE_RTC, alarm_data,
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(rtc_reg_map[REG_ALARM_SECONDS_REG]), ALL_TIME_REGS);
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if (ret) {
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dev_err(dev, "rtc_set_alarm error %d\n", ret);
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goto out;
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}
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if (alm->enabled)
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ret = twl_rtc_alarm_irq_enable(dev, 1);
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out:
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return ret;
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}
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static irqreturn_t twl_rtc_interrupt(int irq, void *rtc)
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{
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unsigned long events;
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int ret = IRQ_NONE;
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int res;
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u8 rd_reg;
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res = twl_rtc_read_u8(&rd_reg, REG_RTC_STATUS_REG);
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if (res)
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goto out;
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/*
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* Figure out source of interrupt: ALARM or TIMER in RTC_STATUS_REG.
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* only one (ALARM or RTC) interrupt source may be enabled
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* at time, we also could check our results
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* by reading RTS_INTERRUPTS_REGISTER[IT_TIMER,IT_ALARM]
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*/
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if (rd_reg & BIT_RTC_STATUS_REG_ALARM_M)
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events = RTC_IRQF | RTC_AF;
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else
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events = RTC_IRQF | RTC_PF;
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res = twl_rtc_write_u8(BIT_RTC_STATUS_REG_ALARM_M,
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REG_RTC_STATUS_REG);
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if (res)
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goto out;
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if (twl_class_is_4030()) {
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/* Clear on Read enabled. RTC_IT bit of TWL4030_INT_PWR_ISR1
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* needs 2 reads to clear the interrupt. One read is done in
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* do_twl_pwrirq(). Doing the second read, to clear
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* the bit.
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*
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* FIXME the reason PWR_ISR1 needs an extra read is that
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* RTC_IF retriggered until we cleared REG_ALARM_M above.
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* But re-reading like this is a bad hack; by doing so we
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* risk wrongly clearing status for some other IRQ (losing
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* the interrupt). Be smarter about handling RTC_UF ...
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*/
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res = twl_i2c_read_u8(TWL4030_MODULE_INT,
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&rd_reg, TWL4030_INT_PWR_ISR1);
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if (res)
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goto out;
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}
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/* Notify RTC core on event */
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rtc_update_irq(rtc, 1, events);
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ret = IRQ_HANDLED;
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out:
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return ret;
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}
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static struct rtc_class_ops twl_rtc_ops = {
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.read_time = twl_rtc_read_time,
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.set_time = twl_rtc_set_time,
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.read_alarm = twl_rtc_read_alarm,
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.set_alarm = twl_rtc_set_alarm,
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.alarm_irq_enable = twl_rtc_alarm_irq_enable,
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};
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/*----------------------------------------------------------------------*/
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static int __devinit twl_rtc_probe(struct platform_device *pdev)
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{
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struct rtc_device *rtc;
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int ret = -EINVAL;
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int irq = platform_get_irq(pdev, 0);
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u8 rd_reg;
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if (irq <= 0)
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goto out1;
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ret = twl_rtc_read_u8(&rd_reg, REG_RTC_STATUS_REG);
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if (ret < 0)
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goto out1;
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if (rd_reg & BIT_RTC_STATUS_REG_POWER_UP_M)
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dev_warn(&pdev->dev, "Power up reset detected.\n");
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if (rd_reg & BIT_RTC_STATUS_REG_ALARM_M)
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dev_warn(&pdev->dev, "Pending Alarm interrupt detected.\n");
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/* Clear RTC Power up reset and pending alarm interrupts */
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ret = twl_rtc_write_u8(rd_reg, REG_RTC_STATUS_REG);
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if (ret < 0)
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goto out1;
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if (twl_class_is_6030()) {
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twl6030_interrupt_unmask(TWL6030_RTC_INT_MASK,
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REG_INT_MSK_LINE_A);
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twl6030_interrupt_unmask(TWL6030_RTC_INT_MASK,
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REG_INT_MSK_STS_A);
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}
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dev_info(&pdev->dev, "Enabling TWL-RTC\n");
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ret = twl_rtc_write_u8(BIT_RTC_CTRL_REG_STOP_RTC_M, REG_RTC_CTRL_REG);
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if (ret < 0)
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goto out1;
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/* init cached IRQ enable bits */
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ret = twl_rtc_read_u8(&rtc_irq_bits, REG_RTC_INTERRUPTS_REG);
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if (ret < 0)
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goto out1;
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rtc = rtc_device_register(pdev->name,
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&pdev->dev, &twl_rtc_ops, THIS_MODULE);
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if (IS_ERR(rtc)) {
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ret = PTR_ERR(rtc);
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dev_err(&pdev->dev, "can't register RTC device, err %ld\n",
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PTR_ERR(rtc));
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goto out1;
|
|
}
|
|
|
|
ret = request_threaded_irq(irq, NULL, twl_rtc_interrupt,
|
|
IRQF_TRIGGER_RISING,
|
|
dev_name(&rtc->dev), rtc);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "IRQ is not free.\n");
|
|
goto out2;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, rtc);
|
|
return 0;
|
|
|
|
out2:
|
|
rtc_device_unregister(rtc);
|
|
out1:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Disable all TWL RTC module interrupts.
|
|
* Sets status flag to free.
|
|
*/
|
|
static int __devexit twl_rtc_remove(struct platform_device *pdev)
|
|
{
|
|
/* leave rtc running, but disable irqs */
|
|
struct rtc_device *rtc = platform_get_drvdata(pdev);
|
|
int irq = platform_get_irq(pdev, 0);
|
|
|
|
mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
|
|
mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
|
|
if (twl_class_is_6030()) {
|
|
twl6030_interrupt_mask(TWL6030_RTC_INT_MASK,
|
|
REG_INT_MSK_LINE_A);
|
|
twl6030_interrupt_mask(TWL6030_RTC_INT_MASK,
|
|
REG_INT_MSK_STS_A);
|
|
}
|
|
|
|
|
|
free_irq(irq, rtc);
|
|
|
|
rtc_device_unregister(rtc);
|
|
platform_set_drvdata(pdev, NULL);
|
|
return 0;
|
|
}
|
|
|
|
static void twl_rtc_shutdown(struct platform_device *pdev)
|
|
{
|
|
/* mask timer interrupts, but leave alarm interrupts on to enable
|
|
power-on when alarm is triggered */
|
|
mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
static unsigned char irqstat;
|
|
|
|
static int twl_rtc_suspend(struct platform_device *pdev, pm_message_t state)
|
|
{
|
|
irqstat = rtc_irq_bits;
|
|
|
|
mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
|
|
return 0;
|
|
}
|
|
|
|
static int twl_rtc_resume(struct platform_device *pdev)
|
|
{
|
|
set_rtc_irq_bit(irqstat);
|
|
return 0;
|
|
}
|
|
|
|
#else
|
|
#define twl_rtc_suspend NULL
|
|
#define twl_rtc_resume NULL
|
|
#endif
|
|
|
|
static const struct of_device_id twl_rtc_of_match[] = {
|
|
{.compatible = "ti,twl4030-rtc", },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, twl_rtc_of_match);
|
|
MODULE_ALIAS("platform:twl_rtc");
|
|
|
|
static struct platform_driver twl4030rtc_driver = {
|
|
.probe = twl_rtc_probe,
|
|
.remove = __devexit_p(twl_rtc_remove),
|
|
.shutdown = twl_rtc_shutdown,
|
|
.suspend = twl_rtc_suspend,
|
|
.resume = twl_rtc_resume,
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "twl_rtc",
|
|
.of_match_table = twl_rtc_of_match,
|
|
},
|
|
};
|
|
|
|
static int __init twl_rtc_init(void)
|
|
{
|
|
if (twl_class_is_4030())
|
|
rtc_reg_map = (u8 *) twl4030_rtc_reg_map;
|
|
else
|
|
rtc_reg_map = (u8 *) twl6030_rtc_reg_map;
|
|
|
|
return platform_driver_register(&twl4030rtc_driver);
|
|
}
|
|
module_init(twl_rtc_init);
|
|
|
|
static void __exit twl_rtc_exit(void)
|
|
{
|
|
platform_driver_unregister(&twl4030rtc_driver);
|
|
}
|
|
module_exit(twl_rtc_exit);
|
|
|
|
MODULE_AUTHOR("Texas Instruments, MontaVista Software");
|
|
MODULE_LICENSE("GPL");
|