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drivers/rtc/rtc-moxart.c 8.77 KB
453b4c6db   Jonas Jensen   rtc: add MOXA ART...
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  /*
   * MOXA ART RTC driver.
   *
   * Copyright (C) 2013 Jonas Jensen
   *
   * Jonas Jensen <jonas.jensen@gmail.com>
   *
   * Based on code from
   * Moxa Technology Co., Ltd. <www.moxa.com>
   *
   * This file is licensed under the terms of the GNU General Public
   * License version 2.  This program is licensed "as is" without any
   * warranty of any kind, whether express or implied.
   */
  
  #include <linux/init.h>
  #include <linux/kernel.h>
  #include <linux/delay.h>
  #include <linux/rtc.h>
  #include <linux/platform_device.h>
  #include <linux/module.h>
  #include <linux/gpio.h>
  #include <linux/of_gpio.h>
  
  #define GPIO_RTC_RESERVED			0x0C
  #define GPIO_RTC_DATA_SET			0x10
  #define GPIO_RTC_DATA_CLEAR			0x14
  #define GPIO_RTC_PIN_PULL_ENABLE		0x18
  #define GPIO_RTC_PIN_PULL_TYPE			0x1C
  #define GPIO_RTC_INT_ENABLE			0x20
  #define GPIO_RTC_INT_RAW_STATE			0x24
  #define GPIO_RTC_INT_MASKED_STATE		0x28
  #define GPIO_RTC_INT_MASK			0x2C
  #define GPIO_RTC_INT_CLEAR			0x30
  #define GPIO_RTC_INT_TRIGGER			0x34
  #define GPIO_RTC_INT_BOTH			0x38
  #define GPIO_RTC_INT_RISE_NEG			0x3C
  #define GPIO_RTC_BOUNCE_ENABLE			0x40
  #define GPIO_RTC_BOUNCE_PRE_SCALE		0x44
  #define GPIO_RTC_PROTECT_W			0x8E
  #define GPIO_RTC_PROTECT_R			0x8F
  #define GPIO_RTC_YEAR_W				0x8C
  #define GPIO_RTC_YEAR_R				0x8D
  #define GPIO_RTC_DAY_W				0x8A
  #define GPIO_RTC_DAY_R				0x8B
  #define GPIO_RTC_MONTH_W			0x88
  #define GPIO_RTC_MONTH_R			0x89
  #define GPIO_RTC_DATE_W				0x86
  #define GPIO_RTC_DATE_R				0x87
  #define GPIO_RTC_HOURS_W			0x84
  #define GPIO_RTC_HOURS_R			0x85
  #define GPIO_RTC_MINUTES_W			0x82
  #define GPIO_RTC_MINUTES_R			0x83
  #define GPIO_RTC_SECONDS_W			0x80
  #define GPIO_RTC_SECONDS_R			0x81
  #define GPIO_RTC_DELAY_TIME			8
  
  struct moxart_rtc {
  	struct rtc_device *rtc;
  	spinlock_t rtc_lock;
  	int gpio_data, gpio_sclk, gpio_reset;
  };
  
  static int day_of_year[12] =	{ 0, 31, 59, 90, 120, 151, 181,
  				  212, 243, 273, 304, 334 };
  
  static void moxart_rtc_write_byte(struct device *dev, u8 data)
  {
  	struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev);
  	int i;
  
  	for (i = 0; i < 8; i++, data >>= 1) {
  		gpio_set_value(moxart_rtc->gpio_sclk, 0);
  		gpio_set_value(moxart_rtc->gpio_data, ((data & 1) == 1));
  		udelay(GPIO_RTC_DELAY_TIME);
  		gpio_set_value(moxart_rtc->gpio_sclk, 1);
  		udelay(GPIO_RTC_DELAY_TIME);
  	}
  }
  
  static u8 moxart_rtc_read_byte(struct device *dev)
  {
  	struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev);
  	int i;
  	u8 data = 0;
  
  	for (i = 0; i < 8; i++) {
  		gpio_set_value(moxart_rtc->gpio_sclk, 0);
  		udelay(GPIO_RTC_DELAY_TIME);
  		gpio_set_value(moxart_rtc->gpio_sclk, 1);
  		udelay(GPIO_RTC_DELAY_TIME);
  		if (gpio_get_value(moxart_rtc->gpio_data))
  			data |= (1 << i);
  		udelay(GPIO_RTC_DELAY_TIME);
  	}
  	return data;
  }
  
  static u8 moxart_rtc_read_register(struct device *dev, u8 cmd)
  {
  	struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev);
  	u8 data;
  	unsigned long flags;
  
  	local_irq_save(flags);
  
  	gpio_direction_output(moxart_rtc->gpio_data, 0);
  	gpio_set_value(moxart_rtc->gpio_reset, 1);
  	udelay(GPIO_RTC_DELAY_TIME);
  	moxart_rtc_write_byte(dev, cmd);
  	gpio_direction_input(moxart_rtc->gpio_data);
  	udelay(GPIO_RTC_DELAY_TIME);
  	data = moxart_rtc_read_byte(dev);
  	gpio_set_value(moxart_rtc->gpio_sclk, 0);
  	gpio_set_value(moxart_rtc->gpio_reset, 0);
  	udelay(GPIO_RTC_DELAY_TIME);
  
  	local_irq_restore(flags);
  
  	return data;
  }
  
  static void moxart_rtc_write_register(struct device *dev, u8 cmd, u8 data)
  {
  	struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev);
  	unsigned long flags;
  
  	local_irq_save(flags);
  
  	gpio_direction_output(moxart_rtc->gpio_data, 0);
  	gpio_set_value(moxart_rtc->gpio_reset, 1);
  	udelay(GPIO_RTC_DELAY_TIME);
  	moxart_rtc_write_byte(dev, cmd);
  	moxart_rtc_write_byte(dev, data);
  	gpio_set_value(moxart_rtc->gpio_sclk, 0);
  	gpio_set_value(moxart_rtc->gpio_reset, 0);
  	udelay(GPIO_RTC_DELAY_TIME);
  
  	local_irq_restore(flags);
  }
  
  static int moxart_rtc_set_time(struct device *dev, struct rtc_time *tm)
  {
  	struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev);
  
  	spin_lock_irq(&moxart_rtc->rtc_lock);
  
  	moxart_rtc_write_register(dev, GPIO_RTC_PROTECT_W, 0);
  	moxart_rtc_write_register(dev, GPIO_RTC_YEAR_W,
  				  (((tm->tm_year - 100) / 10) << 4) |
  				  ((tm->tm_year - 100) % 10));
  
  	moxart_rtc_write_register(dev, GPIO_RTC_MONTH_W,
  				  (((tm->tm_mon + 1) / 10) << 4) |
  				  ((tm->tm_mon + 1) % 10));
  
  	moxart_rtc_write_register(dev, GPIO_RTC_DATE_W,
  				  ((tm->tm_mday / 10) << 4) |
  				  (tm->tm_mday % 10));
  
  	moxart_rtc_write_register(dev, GPIO_RTC_HOURS_W,
  				  ((tm->tm_hour / 10) << 4) |
  				  (tm->tm_hour % 10));
  
  	moxart_rtc_write_register(dev, GPIO_RTC_MINUTES_W,
  				  ((tm->tm_min / 10) << 4) |
  				  (tm->tm_min % 10));
  
  	moxart_rtc_write_register(dev, GPIO_RTC_SECONDS_W,
  				  ((tm->tm_sec / 10) << 4) |
  				  (tm->tm_sec % 10));
  
  	moxart_rtc_write_register(dev, GPIO_RTC_PROTECT_W, 0x80);
  
  	spin_unlock_irq(&moxart_rtc->rtc_lock);
  
  	dev_dbg(dev, "%s: success tm_year=%d tm_mon=%d
  "
  		"tm_mday=%d tm_hour=%d tm_min=%d tm_sec=%d
  ",
  		__func__, tm->tm_year, tm->tm_mon, tm->tm_mday,
  		tm->tm_hour, tm->tm_min, tm->tm_sec);
  
  	return 0;
  }
  
  static int moxart_rtc_read_time(struct device *dev, struct rtc_time *tm)
  {
  	struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev);
  	unsigned char v;
  
  	spin_lock_irq(&moxart_rtc->rtc_lock);
  
  	v = moxart_rtc_read_register(dev, GPIO_RTC_SECONDS_R);
  	tm->tm_sec = (((v & 0x70) >> 4) * 10) + (v & 0x0F);
  
  	v = moxart_rtc_read_register(dev, GPIO_RTC_MINUTES_R);
  	tm->tm_min = (((v & 0x70) >> 4) * 10) + (v & 0x0F);
  
  	v = moxart_rtc_read_register(dev, GPIO_RTC_HOURS_R);
  	if (v & 0x80) { /* 12-hour mode */
  		tm->tm_hour = (((v & 0x10) >> 4) * 10) + (v & 0x0F);
  		if (v & 0x20) { /* PM mode */
  			tm->tm_hour += 12;
  			if (tm->tm_hour >= 24)
  				tm->tm_hour = 0;
  		}
  	} else { /* 24-hour mode */
  		tm->tm_hour = (((v & 0x30) >> 4) * 10) + (v & 0x0F);
  	}
  
  	v = moxart_rtc_read_register(dev, GPIO_RTC_DATE_R);
  	tm->tm_mday = (((v & 0x30) >> 4) * 10) + (v & 0x0F);
  
  	v = moxart_rtc_read_register(dev, GPIO_RTC_MONTH_R);
  	tm->tm_mon = (((v & 0x10) >> 4) * 10) + (v & 0x0F);
  	tm->tm_mon--;
  
  	v = moxart_rtc_read_register(dev, GPIO_RTC_YEAR_R);
  	tm->tm_year = (((v & 0xF0) >> 4) * 10) + (v & 0x0F);
  	tm->tm_year += 100;
  	if (tm->tm_year <= 69)
  		tm->tm_year += 100;
  
  	v = moxart_rtc_read_register(dev, GPIO_RTC_DAY_R);
  	tm->tm_wday = (v & 0x0f) - 1;
  	tm->tm_yday = day_of_year[tm->tm_mon];
  	tm->tm_yday += (tm->tm_mday - 1);
  	if (tm->tm_mon >= 2) {
  		if (!(tm->tm_year % 4) && (tm->tm_year % 100))
  			tm->tm_yday++;
  	}
  
  	tm->tm_isdst = 0;
  
  	spin_unlock_irq(&moxart_rtc->rtc_lock);
  
  	return 0;
  }
  
  static const struct rtc_class_ops moxart_rtc_ops = {
  	.read_time	= moxart_rtc_read_time,
  	.set_time	= moxart_rtc_set_time,
  };
  
  static int moxart_rtc_probe(struct platform_device *pdev)
  {
  	struct moxart_rtc *moxart_rtc;
  	int ret = 0;
  
  	moxart_rtc = devm_kzalloc(&pdev->dev, sizeof(*moxart_rtc), GFP_KERNEL);
4410af6e7   Jingoo Han   rtc: rtc-moxart: ...
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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,
  						  "gpio-rtc-data", 0);
  	if (!gpio_is_valid(moxart_rtc->gpio_data)) {
  		dev_err(&pdev->dev, "invalid gpio (data): %d
  ",
  			moxart_rtc->gpio_data);
  		return moxart_rtc->gpio_data;
  	}
  
  	moxart_rtc->gpio_sclk = of_get_named_gpio(pdev->dev.of_node,
  						  "gpio-rtc-sclk", 0);
  	if (!gpio_is_valid(moxart_rtc->gpio_sclk)) {
  		dev_err(&pdev->dev, "invalid gpio (sclk): %d
  ",
  			moxart_rtc->gpio_sclk);
  		return moxart_rtc->gpio_sclk;
  	}
  
  	moxart_rtc->gpio_reset = of_get_named_gpio(pdev->dev.of_node,
  						   "gpio-rtc-reset", 0);
  	if (!gpio_is_valid(moxart_rtc->gpio_reset)) {
  		dev_err(&pdev->dev, "invalid gpio (reset): %d
  ",
  			moxart_rtc->gpio_reset);
  		return moxart_rtc->gpio_reset;
  	}
  
  	spin_lock_init(&moxart_rtc->rtc_lock);
  	platform_set_drvdata(pdev, moxart_rtc);
  
  	ret = devm_gpio_request(&pdev->dev, moxart_rtc->gpio_data, "rtc_data");
  	if (ret) {
  		dev_err(&pdev->dev, "can't get rtc_data gpio
  ");
  		return ret;
  	}
  
  	ret = devm_gpio_request_one(&pdev->dev, moxart_rtc->gpio_sclk,
  				    GPIOF_DIR_OUT, "rtc_sclk");
  	if (ret) {
  		dev_err(&pdev->dev, "can't get rtc_sclk gpio
  ");
  		return ret;
  	}
  
  	ret = devm_gpio_request_one(&pdev->dev, moxart_rtc->gpio_reset,
  				    GPIOF_DIR_OUT, "rtc_reset");
  	if (ret) {
  		dev_err(&pdev->dev, "can't get rtc_reset gpio
  ");
  		return ret;
  	}
  
  	moxart_rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
  						   &moxart_rtc_ops,
  						   THIS_MODULE);
  	if (IS_ERR(moxart_rtc->rtc)) {
  		dev_err(&pdev->dev, "devm_rtc_device_register failed
  ");
  		return PTR_ERR(moxart_rtc->rtc);
  	}
  
  	return 0;
  }
  
  static const struct of_device_id moxart_rtc_match[] = {
  	{ .compatible = "moxa,moxart-rtc" },
  	{ },
  };
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  MODULE_DEVICE_TABLE(of, moxart_rtc_match);
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  static struct platform_driver moxart_rtc_driver = {
  	.probe	= moxart_rtc_probe,
  	.driver	= {
  		.name		= "moxart-rtc",
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  		.of_match_table	= moxart_rtc_match,
  	},
  };
  module_platform_driver(moxart_rtc_driver);
  
  MODULE_DESCRIPTION("MOXART RTC driver");
  MODULE_LICENSE("GPL");
  MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>");