drivers/rtc/rtc-v3020.c - kernel/msm-4.9 - Gitiles

 /* drivers/rtc/rtc-v3020.c
  *
  * Copyright (C) 2006 8D Technologies inc.
  * Copyright (C) 2004 Compulab Ltd.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  *
  * Driver for the V3020 RTC
  *
  * Changelog:
  *
  *  10-May-2006: Raphael Assenat <raph@8d.com>
  *				- Converted to platform driver
  *				- Use the generic rtc class
  *
  *  ??-???-2004: Someone at Compulab
  *  			- Initial driver creation.
  *
  */
 #include <linux/platform_device.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/rtc.h>
 #include <linux/types.h>
 #include <linux/bcd.h>
 #include <linux/rtc-v3020.h>
 #include <linux/delay.h>

 #include <asm/io.h>

 #undef DEBUG

 struct v3020 {
 	void __iomem *ioaddress;
 	int leftshift;
 	struct rtc_device *rtc;
 };

 static void v3020_set_reg(struct v3020 *chip, unsigned char address,
 			unsigned char data)
 {
 	int i;
 	unsigned char tmp;

 	tmp = address;
 	for (i = 0; i < 4; i++) {
 		writel((tmp & 1) << chip->leftshift, chip->ioaddress);
 		tmp >>= 1;
 		udelay(1);
 	}

 	/* Commands dont have data */
 	if (!V3020_IS_COMMAND(address)) {
 		for (i = 0; i < 8; i++) {
 			writel((data & 1) << chip->leftshift, chip->ioaddress);
 			data >>= 1;
 			udelay(1);
 		}
 	}
 }

 static unsigned char v3020_get_reg(struct v3020 *chip, unsigned char address)
 {
 	unsigned int data=0;
 	int i;

 	for (i = 0; i < 4; i++) {
 		writel((address & 1) << chip->leftshift, chip->ioaddress);
 		address >>= 1;
 		udelay(1);
 	}

 	for (i = 0; i < 8; i++) {
 		data >>= 1;
 		if (readl(chip->ioaddress) & (1 << chip->leftshift))
 			data |= 0x80;
 		udelay(1);
 	}

 	return data;
 }

 static int v3020_read_time(struct device *dev, struct rtc_time *dt)
 {
 	struct v3020 *chip = dev_get_drvdata(dev);
 	int tmp;

 	/* Copy the current time to ram... */
 	v3020_set_reg(chip, V3020_CMD_CLOCK2RAM, 0);

 	/* ...and then read constant values. */
 	tmp = v3020_get_reg(chip, V3020_SECONDS);
 	dt->tm_sec	= bcd2bin(tmp);
 	tmp = v3020_get_reg(chip, V3020_MINUTES);
 	dt->tm_min	= bcd2bin(tmp);
 	tmp = v3020_get_reg(chip, V3020_HOURS);
 	dt->tm_hour	= bcd2bin(tmp);
 	tmp = v3020_get_reg(chip, V3020_MONTH_DAY);
 	dt->tm_mday	= bcd2bin(tmp);
 	tmp = v3020_get_reg(chip, V3020_MONTH);
 	dt->tm_mon    = bcd2bin(tmp) - 1;
 	tmp = v3020_get_reg(chip, V3020_WEEK_DAY);
 	dt->tm_wday	= bcd2bin(tmp);
 	tmp = v3020_get_reg(chip, V3020_YEAR);
 	dt->tm_year = bcd2bin(tmp)+100;

 #ifdef DEBUG
 	printk("\n%s : Read RTC values\n",__func__);
 	printk("tm_hour: %i\n",dt->tm_hour);
 	printk("tm_min : %i\n",dt->tm_min);
 	printk("tm_sec : %i\n",dt->tm_sec);
 	printk("tm_year: %i\n",dt->tm_year);
 	printk("tm_mon : %i\n",dt->tm_mon);
 	printk("tm_mday: %i\n",dt->tm_mday);
 	printk("tm_wday: %i\n",dt->tm_wday);
 #endif

 	return 0;
 }


 static int v3020_set_time(struct device *dev, struct rtc_time *dt)
 {
 	struct v3020 *chip = dev_get_drvdata(dev);

 #ifdef DEBUG
 	printk("\n%s : Setting RTC values\n",__func__);
 	printk("tm_sec : %i\n",dt->tm_sec);
 	printk("tm_min : %i\n",dt->tm_min);
 	printk("tm_hour: %i\n",dt->tm_hour);
 	printk("tm_mday: %i\n",dt->tm_mday);
 	printk("tm_wday: %i\n",dt->tm_wday);
 	printk("tm_year: %i\n",dt->tm_year);
 #endif

 	/* Write all the values to ram... */
 	v3020_set_reg(chip, V3020_SECONDS, 	bin2bcd(dt->tm_sec));
 	v3020_set_reg(chip, V3020_MINUTES, 	bin2bcd(dt->tm_min));
 	v3020_set_reg(chip, V3020_HOURS, 	bin2bcd(dt->tm_hour));
 	v3020_set_reg(chip, V3020_MONTH_DAY,	bin2bcd(dt->tm_mday));
 	v3020_set_reg(chip, V3020_MONTH,     bin2bcd(dt->tm_mon + 1));
 	v3020_set_reg(chip, V3020_WEEK_DAY, 	bin2bcd(dt->tm_wday));
 	v3020_set_reg(chip, V3020_YEAR, 	bin2bcd(dt->tm_year % 100));

 	/* ...and set the clock. */
 	v3020_set_reg(chip, V3020_CMD_RAM2CLOCK, 0);

 	/* Compulab used this delay here. I dont know why,
 	 * the datasheet does not specify a delay. */
 	/*mdelay(5);*/

 	return 0;
 }

 static const struct rtc_class_ops v3020_rtc_ops = {
 	.read_time	= v3020_read_time,
 	.set_time	= v3020_set_time,
 };

 static int rtc_probe(struct platform_device *pdev)
 {
 	struct v3020_platform_data *pdata = pdev->dev.platform_data;
 	struct v3020 *chip;
 	struct rtc_device *rtc;
 	int retval = -EBUSY;
 	int i;
 	int temp;

 	if (pdev->num_resources != 1)
 		return -EBUSY;

 	if (pdev->resource[0].flags != IORESOURCE_MEM)
 		return -EBUSY;

 	chip = kzalloc(sizeof *chip, GFP_KERNEL);
 	if (!chip)
 		return -ENOMEM;

 	chip->leftshift = pdata->leftshift;
 	chip->ioaddress = ioremap(pdev->resource[0].start, 1);
 	if (chip->ioaddress == NULL)
 		goto err_chip;

 	/* Make sure the v3020 expects a communication cycle
 	 * by reading 8 times */
 	for (i = 0; i < 8; i++)
 		temp = readl(chip->ioaddress);

 	/* Test chip by doing a write/read sequence
 	 * to the chip ram */
 	v3020_set_reg(chip, V3020_SECONDS, 0x33);
 	if(v3020_get_reg(chip, V3020_SECONDS) != 0x33) {
 		retval = -ENODEV;
 		goto err_io;
 	}

 	/* Make sure frequency measurment mode, test modes, and lock
 	 * are all disabled */
 	v3020_set_reg(chip, V3020_STATUS_0, 0x0);

 	dev_info(&pdev->dev, "Chip available at physical address 0x%llx,"
 		"data connected to D%d\n",
 		(unsigned long long)pdev->resource[0].start,
 		chip->leftshift);

 	platform_set_drvdata(pdev, chip);

 	rtc = rtc_device_register("v3020",
 				&pdev->dev, &v3020_rtc_ops, THIS_MODULE);
 	if (IS_ERR(rtc)) {
 		retval = PTR_ERR(rtc);
 		goto err_io;
 	}
 	chip->rtc = rtc;

 	return 0;

 err_io:
 	iounmap(chip->ioaddress);
 err_chip:
 	kfree(chip);

 	return retval;
 }

 static int rtc_remove(struct platform_device *dev)
 {
 	struct v3020 *chip = platform_get_drvdata(dev);
 	struct rtc_device *rtc = chip->rtc;

 	if (rtc)
 		rtc_device_unregister(rtc);

 	iounmap(chip->ioaddress);
 	kfree(chip);

 	return 0;
 }

 static struct platform_driver rtc_device_driver = {
 	.probe	= rtc_probe,
 	.remove = rtc_remove,
 	.driver = {
 		.name	= "v3020",
 		.owner	= THIS_MODULE,
 	},
 };

 static __init int v3020_init(void)
 {
 	return platform_driver_register(&rtc_device_driver);
 }

 static __exit void v3020_exit(void)
 {
 	platform_driver_unregister(&rtc_device_driver);
 }

 module_init(v3020_init);
 module_exit(v3020_exit);

 MODULE_DESCRIPTION("V3020 RTC");
 MODULE_AUTHOR("Raphael Assenat");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:v3020");
	/* drivers/rtc/rtc-v3020.c
	*
	* Copyright (C) 2006 8D Technologies inc.
	* Copyright (C) 2004 Compulab Ltd.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*
	* Driver for the V3020 RTC
	*
	* Changelog:
	*
	* 10-May-2006: Raphael Assenat <raph@8d.com>
	* - Converted to platform driver
	* - Use the generic rtc class
	*
	* ??-???-2004: Someone at Compulab
	* - Initial driver creation.
	*
	*/
	#include <linux/platform_device.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/rtc.h>
	#include <linux/types.h>
	#include <linux/bcd.h>
	#include <linux/rtc-v3020.h>
	#include <linux/delay.h>

	#include <asm/io.h>

	#undef DEBUG

	struct v3020 {
	void __iomem *ioaddress;
	int leftshift;
	struct rtc_device *rtc;
	};

	static void v3020_set_reg(struct v3020 *chip, unsigned char address,
	unsigned char data)
	{
	int i;
	unsigned char tmp;

	tmp = address;
	for (i = 0; i < 4; i++) {
	writel((tmp & 1) << chip->leftshift, chip->ioaddress);
	tmp >>= 1;
	udelay(1);
	}

	/* Commands dont have data */
	if (!V3020_IS_COMMAND(address)) {
	for (i = 0; i < 8; i++) {
	writel((data & 1) << chip->leftshift, chip->ioaddress);
	data >>= 1;
	udelay(1);
	}
	}
	}

	static unsigned char v3020_get_reg(struct v3020 *chip, unsigned char address)
	{
	unsigned int data=0;
	int i;

	for (i = 0; i < 4; i++) {
	writel((address & 1) << chip->leftshift, chip->ioaddress);
	address >>= 1;
	udelay(1);
	}

	for (i = 0; i < 8; i++) {
	data >>= 1;
	if (readl(chip->ioaddress) & (1 << chip->leftshift))
	data \|= 0x80;
	udelay(1);
	}

	return data;
	}

	static int v3020_read_time(struct device dev, struct rtc_time dt)
	{
	struct v3020 *chip = dev_get_drvdata(dev);
	int tmp;

	/* Copy the current time to ram... */
	v3020_set_reg(chip, V3020_CMD_CLOCK2RAM, 0);

	/* ...and then read constant values. */
	tmp = v3020_get_reg(chip, V3020_SECONDS);
	dt->tm_sec = bcd2bin(tmp);
	tmp = v3020_get_reg(chip, V3020_MINUTES);
	dt->tm_min = bcd2bin(tmp);
	tmp = v3020_get_reg(chip, V3020_HOURS);
	dt->tm_hour = bcd2bin(tmp);
	tmp = v3020_get_reg(chip, V3020_MONTH_DAY);
	dt->tm_mday = bcd2bin(tmp);
	tmp = v3020_get_reg(chip, V3020_MONTH);
	dt->tm_mon = bcd2bin(tmp) - 1;
	tmp = v3020_get_reg(chip, V3020_WEEK_DAY);
	dt->tm_wday = bcd2bin(tmp);
	tmp = v3020_get_reg(chip, V3020_YEAR);
	dt->tm_year = bcd2bin(tmp)+100;

	#ifdef DEBUG
	printk("\n%s : Read RTC values\n",__func__);
	printk("tm_hour: %i\n",dt->tm_hour);
	printk("tm_min : %i\n",dt->tm_min);
	printk("tm_sec : %i\n",dt->tm_sec);
	printk("tm_year: %i\n",dt->tm_year);
	printk("tm_mon : %i\n",dt->tm_mon);
	printk("tm_mday: %i\n",dt->tm_mday);
	printk("tm_wday: %i\n",dt->tm_wday);
	#endif

	return 0;
	}


	static int v3020_set_time(struct device dev, struct rtc_time dt)
	{
	struct v3020 *chip = dev_get_drvdata(dev);

	#ifdef DEBUG
	printk("\n%s : Setting RTC values\n",__func__);
	printk("tm_sec : %i\n",dt->tm_sec);
	printk("tm_min : %i\n",dt->tm_min);
	printk("tm_hour: %i\n",dt->tm_hour);
	printk("tm_mday: %i\n",dt->tm_mday);
	printk("tm_wday: %i\n",dt->tm_wday);
	printk("tm_year: %i\n",dt->tm_year);
	#endif

	/* Write all the values to ram... */
	v3020_set_reg(chip, V3020_SECONDS, bin2bcd(dt->tm_sec));
	v3020_set_reg(chip, V3020_MINUTES, bin2bcd(dt->tm_min));
	v3020_set_reg(chip, V3020_HOURS, bin2bcd(dt->tm_hour));
	v3020_set_reg(chip, V3020_MONTH_DAY, bin2bcd(dt->tm_mday));
	v3020_set_reg(chip, V3020_MONTH, bin2bcd(dt->tm_mon + 1));
	v3020_set_reg(chip, V3020_WEEK_DAY, bin2bcd(dt->tm_wday));
	v3020_set_reg(chip, V3020_YEAR, bin2bcd(dt->tm_year % 100));

	/* ...and set the clock. */
	v3020_set_reg(chip, V3020_CMD_RAM2CLOCK, 0);

	/* Compulab used this delay here. I dont know why,
	* the datasheet does not specify a delay. */
	/mdelay(5);/

	return 0;
	}

	static const struct rtc_class_ops v3020_rtc_ops = {
	.read_time = v3020_read_time,
	.set_time = v3020_set_time,
	};

	static int rtc_probe(struct platform_device *pdev)
	{
	struct v3020_platform_data *pdata = pdev->dev.platform_data;
	struct v3020 *chip;
	struct rtc_device *rtc;
	int retval = -EBUSY;
	int i;
	int temp;

	if (pdev->num_resources != 1)
	return -EBUSY;

	if (pdev->resource[0].flags != IORESOURCE_MEM)
	return -EBUSY;

	chip = kzalloc(sizeof *chip, GFP_KERNEL);
	if (!chip)
	return -ENOMEM;

	chip->leftshift = pdata->leftshift;
	chip->ioaddress = ioremap(pdev->resource[0].start, 1);
	if (chip->ioaddress == NULL)
	goto err_chip;

	/* Make sure the v3020 expects a communication cycle
	* by reading 8 times */
	for (i = 0; i < 8; i++)
	temp = readl(chip->ioaddress);

	/* Test chip by doing a write/read sequence
	* to the chip ram */
	v3020_set_reg(chip, V3020_SECONDS, 0x33);
	if(v3020_get_reg(chip, V3020_SECONDS) != 0x33) {
	retval = -ENODEV;
	goto err_io;
	}

	/* Make sure frequency measurment mode, test modes, and lock
	* are all disabled */
	v3020_set_reg(chip, V3020_STATUS_0, 0x0);

	dev_info(&pdev->dev, "Chip available at physical address 0x%llx,"
	"data connected to D%d\n",
	(unsigned long long)pdev->resource[0].start,
	chip->leftshift);

	platform_set_drvdata(pdev, chip);

	rtc = rtc_device_register("v3020",
	&pdev->dev, &v3020_rtc_ops, THIS_MODULE);
	if (IS_ERR(rtc)) {
	retval = PTR_ERR(rtc);
	goto err_io;
	}
	chip->rtc = rtc;

	return 0;

	err_io:
	iounmap(chip->ioaddress);
	err_chip:
	kfree(chip);

	return retval;
	}

	static int rtc_remove(struct platform_device *dev)
	{
	struct v3020 *chip = platform_get_drvdata(dev);
	struct rtc_device *rtc = chip->rtc;

	if (rtc)
	rtc_device_unregister(rtc);

	iounmap(chip->ioaddress);
	kfree(chip);

	return 0;
	}

	static struct platform_driver rtc_device_driver = {
	.probe = rtc_probe,
	.remove = rtc_remove,
	.driver = {
	.name = "v3020",
	.owner = THIS_MODULE,
	},
	};

	static __init int v3020_init(void)
	{
	return platform_driver_register(&rtc_device_driver);
	}

	static __exit void v3020_exit(void)
	{
	platform_driver_unregister(&rtc_device_driver);
	}

	module_init(v3020_init);
	module_exit(v3020_exit);

	MODULE_DESCRIPTION("V3020 RTC");
	MODULE_AUTHOR("Raphael Assenat");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:v3020");