328 lines
8.7 KiB
C
328 lines
8.7 KiB
C
/*
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* MOXA ART RTC driver.
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*
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* Copyright (C) 2013 Jonas Jensen
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*
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* Jonas Jensen <jonas.jensen@gmail.com>
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*
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* Based on code from
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* Moxa Technology Co., Ltd. <www.moxa.com>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/rtc.h>
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/gpio.h>
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#include <linux/of_gpio.h>
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#define GPIO_RTC_RESERVED 0x0C
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#define GPIO_RTC_DATA_SET 0x10
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#define GPIO_RTC_DATA_CLEAR 0x14
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#define GPIO_RTC_PIN_PULL_ENABLE 0x18
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#define GPIO_RTC_PIN_PULL_TYPE 0x1C
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#define GPIO_RTC_INT_ENABLE 0x20
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#define GPIO_RTC_INT_RAW_STATE 0x24
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#define GPIO_RTC_INT_MASKED_STATE 0x28
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#define GPIO_RTC_INT_MASK 0x2C
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#define GPIO_RTC_INT_CLEAR 0x30
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#define GPIO_RTC_INT_TRIGGER 0x34
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#define GPIO_RTC_INT_BOTH 0x38
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#define GPIO_RTC_INT_RISE_NEG 0x3C
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#define GPIO_RTC_BOUNCE_ENABLE 0x40
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#define GPIO_RTC_BOUNCE_PRE_SCALE 0x44
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#define GPIO_RTC_PROTECT_W 0x8E
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#define GPIO_RTC_PROTECT_R 0x8F
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#define GPIO_RTC_YEAR_W 0x8C
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#define GPIO_RTC_YEAR_R 0x8D
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#define GPIO_RTC_DAY_W 0x8A
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#define GPIO_RTC_DAY_R 0x8B
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#define GPIO_RTC_MONTH_W 0x88
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#define GPIO_RTC_MONTH_R 0x89
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#define GPIO_RTC_DATE_W 0x86
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#define GPIO_RTC_DATE_R 0x87
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#define GPIO_RTC_HOURS_W 0x84
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#define GPIO_RTC_HOURS_R 0x85
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#define GPIO_RTC_MINUTES_W 0x82
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#define GPIO_RTC_MINUTES_R 0x83
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#define GPIO_RTC_SECONDS_W 0x80
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#define GPIO_RTC_SECONDS_R 0x81
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#define GPIO_RTC_DELAY_TIME 8
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struct moxart_rtc {
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struct rtc_device *rtc;
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spinlock_t rtc_lock;
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int gpio_data, gpio_sclk, gpio_reset;
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};
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static int day_of_year[12] = { 0, 31, 59, 90, 120, 151, 181,
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212, 243, 273, 304, 334 };
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static void moxart_rtc_write_byte(struct device *dev, u8 data)
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{
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struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev);
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int i;
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for (i = 0; i < 8; i++, data >>= 1) {
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gpio_set_value(moxart_rtc->gpio_sclk, 0);
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gpio_set_value(moxart_rtc->gpio_data, ((data & 1) == 1));
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udelay(GPIO_RTC_DELAY_TIME);
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gpio_set_value(moxart_rtc->gpio_sclk, 1);
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udelay(GPIO_RTC_DELAY_TIME);
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}
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}
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static u8 moxart_rtc_read_byte(struct device *dev)
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{
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struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev);
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int i;
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u8 data = 0;
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for (i = 0; i < 8; i++) {
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gpio_set_value(moxart_rtc->gpio_sclk, 0);
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udelay(GPIO_RTC_DELAY_TIME);
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gpio_set_value(moxart_rtc->gpio_sclk, 1);
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udelay(GPIO_RTC_DELAY_TIME);
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if (gpio_get_value(moxart_rtc->gpio_data))
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data |= (1 << i);
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udelay(GPIO_RTC_DELAY_TIME);
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}
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return data;
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}
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static u8 moxart_rtc_read_register(struct device *dev, u8 cmd)
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{
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struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev);
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u8 data;
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unsigned long flags;
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local_irq_save(flags);
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gpio_direction_output(moxart_rtc->gpio_data, 0);
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gpio_set_value(moxart_rtc->gpio_reset, 1);
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udelay(GPIO_RTC_DELAY_TIME);
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moxart_rtc_write_byte(dev, cmd);
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gpio_direction_input(moxart_rtc->gpio_data);
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udelay(GPIO_RTC_DELAY_TIME);
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data = moxart_rtc_read_byte(dev);
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gpio_set_value(moxart_rtc->gpio_sclk, 0);
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gpio_set_value(moxart_rtc->gpio_reset, 0);
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udelay(GPIO_RTC_DELAY_TIME);
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local_irq_restore(flags);
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return data;
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}
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static void moxart_rtc_write_register(struct device *dev, u8 cmd, u8 data)
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{
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struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev);
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unsigned long flags;
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local_irq_save(flags);
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gpio_direction_output(moxart_rtc->gpio_data, 0);
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gpio_set_value(moxart_rtc->gpio_reset, 1);
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udelay(GPIO_RTC_DELAY_TIME);
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moxart_rtc_write_byte(dev, cmd);
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moxart_rtc_write_byte(dev, data);
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gpio_set_value(moxart_rtc->gpio_sclk, 0);
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gpio_set_value(moxart_rtc->gpio_reset, 0);
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udelay(GPIO_RTC_DELAY_TIME);
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local_irq_restore(flags);
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}
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static int moxart_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev);
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spin_lock_irq(&moxart_rtc->rtc_lock);
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moxart_rtc_write_register(dev, GPIO_RTC_PROTECT_W, 0);
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moxart_rtc_write_register(dev, GPIO_RTC_YEAR_W,
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(((tm->tm_year - 100) / 10) << 4) |
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((tm->tm_year - 100) % 10));
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moxart_rtc_write_register(dev, GPIO_RTC_MONTH_W,
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(((tm->tm_mon + 1) / 10) << 4) |
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((tm->tm_mon + 1) % 10));
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moxart_rtc_write_register(dev, GPIO_RTC_DATE_W,
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((tm->tm_mday / 10) << 4) |
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(tm->tm_mday % 10));
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moxart_rtc_write_register(dev, GPIO_RTC_HOURS_W,
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((tm->tm_hour / 10) << 4) |
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(tm->tm_hour % 10));
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moxart_rtc_write_register(dev, GPIO_RTC_MINUTES_W,
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((tm->tm_min / 10) << 4) |
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(tm->tm_min % 10));
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moxart_rtc_write_register(dev, GPIO_RTC_SECONDS_W,
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((tm->tm_sec / 10) << 4) |
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(tm->tm_sec % 10));
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moxart_rtc_write_register(dev, GPIO_RTC_PROTECT_W, 0x80);
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spin_unlock_irq(&moxart_rtc->rtc_lock);
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dev_dbg(dev, "%s: success tm_year=%d tm_mon=%d\n"
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"tm_mday=%d tm_hour=%d tm_min=%d tm_sec=%d\n",
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__func__, tm->tm_year, tm->tm_mon, tm->tm_mday,
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tm->tm_hour, tm->tm_min, tm->tm_sec);
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return 0;
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}
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static int moxart_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev);
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unsigned char v;
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spin_lock_irq(&moxart_rtc->rtc_lock);
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v = moxart_rtc_read_register(dev, GPIO_RTC_SECONDS_R);
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tm->tm_sec = (((v & 0x70) >> 4) * 10) + (v & 0x0F);
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v = moxart_rtc_read_register(dev, GPIO_RTC_MINUTES_R);
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tm->tm_min = (((v & 0x70) >> 4) * 10) + (v & 0x0F);
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v = moxart_rtc_read_register(dev, GPIO_RTC_HOURS_R);
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if (v & 0x80) { /* 12-hour mode */
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tm->tm_hour = (((v & 0x10) >> 4) * 10) + (v & 0x0F);
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if (v & 0x20) { /* PM mode */
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tm->tm_hour += 12;
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if (tm->tm_hour >= 24)
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tm->tm_hour = 0;
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}
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} else { /* 24-hour mode */
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tm->tm_hour = (((v & 0x30) >> 4) * 10) + (v & 0x0F);
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}
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v = moxart_rtc_read_register(dev, GPIO_RTC_DATE_R);
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tm->tm_mday = (((v & 0x30) >> 4) * 10) + (v & 0x0F);
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v = moxart_rtc_read_register(dev, GPIO_RTC_MONTH_R);
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tm->tm_mon = (((v & 0x10) >> 4) * 10) + (v & 0x0F);
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tm->tm_mon--;
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v = moxart_rtc_read_register(dev, GPIO_RTC_YEAR_R);
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tm->tm_year = (((v & 0xF0) >> 4) * 10) + (v & 0x0F);
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tm->tm_year += 100;
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if (tm->tm_year <= 69)
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tm->tm_year += 100;
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v = moxart_rtc_read_register(dev, GPIO_RTC_DAY_R);
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tm->tm_wday = (v & 0x0f) - 1;
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tm->tm_yday = day_of_year[tm->tm_mon];
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tm->tm_yday += (tm->tm_mday - 1);
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if (tm->tm_mon >= 2) {
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if (!(tm->tm_year % 4) && (tm->tm_year % 100))
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tm->tm_yday++;
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}
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tm->tm_isdst = 0;
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spin_unlock_irq(&moxart_rtc->rtc_lock);
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return 0;
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}
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static const struct rtc_class_ops moxart_rtc_ops = {
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.read_time = moxart_rtc_read_time,
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.set_time = moxart_rtc_set_time,
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};
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static int moxart_rtc_probe(struct platform_device *pdev)
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{
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struct moxart_rtc *moxart_rtc;
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int ret = 0;
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moxart_rtc = devm_kzalloc(&pdev->dev, sizeof(*moxart_rtc), GFP_KERNEL);
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if (!moxart_rtc)
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return -ENOMEM;
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moxart_rtc->gpio_data = of_get_named_gpio(pdev->dev.of_node,
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"gpio-rtc-data", 0);
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if (!gpio_is_valid(moxart_rtc->gpio_data)) {
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dev_err(&pdev->dev, "invalid gpio (data): %d\n",
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moxart_rtc->gpio_data);
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return moxart_rtc->gpio_data;
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}
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moxart_rtc->gpio_sclk = of_get_named_gpio(pdev->dev.of_node,
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"gpio-rtc-sclk", 0);
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if (!gpio_is_valid(moxart_rtc->gpio_sclk)) {
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dev_err(&pdev->dev, "invalid gpio (sclk): %d\n",
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moxart_rtc->gpio_sclk);
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return moxart_rtc->gpio_sclk;
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}
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moxart_rtc->gpio_reset = of_get_named_gpio(pdev->dev.of_node,
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"gpio-rtc-reset", 0);
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if (!gpio_is_valid(moxart_rtc->gpio_reset)) {
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dev_err(&pdev->dev, "invalid gpio (reset): %d\n",
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moxart_rtc->gpio_reset);
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return moxart_rtc->gpio_reset;
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}
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spin_lock_init(&moxart_rtc->rtc_lock);
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platform_set_drvdata(pdev, moxart_rtc);
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ret = devm_gpio_request(&pdev->dev, moxart_rtc->gpio_data, "rtc_data");
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if (ret) {
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dev_err(&pdev->dev, "can't get rtc_data gpio\n");
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return ret;
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}
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ret = devm_gpio_request_one(&pdev->dev, moxart_rtc->gpio_sclk,
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GPIOF_DIR_OUT, "rtc_sclk");
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if (ret) {
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dev_err(&pdev->dev, "can't get rtc_sclk gpio\n");
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return ret;
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}
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ret = devm_gpio_request_one(&pdev->dev, moxart_rtc->gpio_reset,
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GPIOF_DIR_OUT, "rtc_reset");
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if (ret) {
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dev_err(&pdev->dev, "can't get rtc_reset gpio\n");
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return ret;
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}
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moxart_rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
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&moxart_rtc_ops,
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THIS_MODULE);
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if (IS_ERR(moxart_rtc->rtc)) {
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dev_err(&pdev->dev, "devm_rtc_device_register failed\n");
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return PTR_ERR(moxart_rtc->rtc);
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}
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return 0;
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}
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static const struct of_device_id moxart_rtc_match[] = {
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{ .compatible = "moxa,moxart-rtc" },
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{ },
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};
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static struct platform_driver moxart_rtc_driver = {
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.probe = moxart_rtc_probe,
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.driver = {
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.name = "moxart-rtc",
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.of_match_table = moxart_rtc_match,
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},
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};
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module_platform_driver(moxart_rtc_driver);
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MODULE_DESCRIPTION("MOXART RTC driver");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>");
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