rtc: remove v3020 driver

The v3020 RTC driver was exclusively used by the now removed
cm-x300.c machine.

Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-rtc@vger.kernel.org
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 0 insertions, 369 deletions

diff --git a/drivers/rtc/rtc-v3020.c b/drivers/rtc/rtc-v3020.c
deleted file mode 100644
index 4e8341c49f51..000000000000
--- a/drivers/rtc/rtc-v3020.c
+++ /dev/null
@@ -1,369 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/* drivers/rtc/rtc-v3020.c
- *
- * Copyright (C) 2006 8D Technologies inc.
- * Copyright (C) 2004 Compulab Ltd.
- *
- * 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/platform_data/rtc-v3020.h>
-#include <linux/delay.h>
-#include <linux/gpio.h>
-#include <linux/slab.h>
-
-#include <linux/io.h>
-
-#undef DEBUG
-
-struct v3020;
-
-struct v3020_chip_ops {
-	int (*map_io)(struct v3020 *chip, struct platform_device *pdev,
-		      struct v3020_platform_data *pdata);
-	void (*unmap_io)(struct v3020 *chip);
-	unsigned char (*read_bit)(struct v3020 *chip);
-	void (*write_bit)(struct v3020 *chip, unsigned char bit);
-};
-
-#define V3020_CS	0
-#define V3020_WR	1
-#define V3020_RD	2
-#define V3020_IO	3
-
-struct v3020 {
-	/* MMIO access */
-	void __iomem *ioaddress;
-	int leftshift;
-
-	/* GPIO access */
-	struct gpio *gpio;
-
-	const struct v3020_chip_ops *ops;
-
-	struct rtc_device *rtc;
-};
-
-
-static int v3020_mmio_map(struct v3020 *chip, struct platform_device *pdev,
-			  struct v3020_platform_data *pdata)
-{
-	if (pdev->num_resources != 1)
-		return -EBUSY;
-
-	if (pdev->resource[0].flags != IORESOURCE_MEM)
-		return -EBUSY;
-
-	chip->leftshift = pdata->leftshift;
-	chip->ioaddress = ioremap(pdev->resource[0].start, 1);
-	if (chip->ioaddress == NULL)
-		return -EBUSY;
-
-	return 0;
-}
-
-static void v3020_mmio_unmap(struct v3020 *chip)
-{
-	iounmap(chip->ioaddress);
-}
-
-static void v3020_mmio_write_bit(struct v3020 *chip, unsigned char bit)
-{
-	writel(bit << chip->leftshift, chip->ioaddress);
-}
-
-static unsigned char v3020_mmio_read_bit(struct v3020 *chip)
-{
-	return !!(readl(chip->ioaddress) & (1 << chip->leftshift));
-}
-
-static const struct v3020_chip_ops v3020_mmio_ops = {
-	.map_io		= v3020_mmio_map,
-	.unmap_io	= v3020_mmio_unmap,
-	.read_bit	= v3020_mmio_read_bit,
-	.write_bit	= v3020_mmio_write_bit,
-};
-
-static struct gpio v3020_gpio[] = {
-	{ 0, GPIOF_OUT_INIT_HIGH, "RTC CS"},
-	{ 0, GPIOF_OUT_INIT_HIGH, "RTC WR"},
-	{ 0, GPIOF_OUT_INIT_HIGH, "RTC RD"},
-	{ 0, GPIOF_OUT_INIT_HIGH, "RTC IO"},
-};
-
-static int v3020_gpio_map(struct v3020 *chip, struct platform_device *pdev,
-			  struct v3020_platform_data *pdata)
-{
-	int err;
-
-	v3020_gpio[V3020_CS].gpio = pdata->gpio_cs;
-	v3020_gpio[V3020_WR].gpio = pdata->gpio_wr;
-	v3020_gpio[V3020_RD].gpio = pdata->gpio_rd;
-	v3020_gpio[V3020_IO].gpio = pdata->gpio_io;
-
-	err = gpio_request_array(v3020_gpio, ARRAY_SIZE(v3020_gpio));
-
-	if (!err)
-		chip->gpio = v3020_gpio;
-
-	return err;
-}
-
-static void v3020_gpio_unmap(struct v3020 *chip)
-{
-	gpio_free_array(v3020_gpio, ARRAY_SIZE(v3020_gpio));
-}
-
-static void v3020_gpio_write_bit(struct v3020 *chip, unsigned char bit)
-{
-	gpio_direction_output(chip->gpio[V3020_IO].gpio, bit);
-	gpio_set_value(chip->gpio[V3020_CS].gpio, 0);
-	gpio_set_value(chip->gpio[V3020_WR].gpio, 0);
-	udelay(1);
-	gpio_set_value(chip->gpio[V3020_WR].gpio, 1);
-	gpio_set_value(chip->gpio[V3020_CS].gpio, 1);
-}
-
-static unsigned char v3020_gpio_read_bit(struct v3020 *chip)
-{
-	int bit;
-
-	gpio_direction_input(chip->gpio[V3020_IO].gpio);
-	gpio_set_value(chip->gpio[V3020_CS].gpio, 0);
-	gpio_set_value(chip->gpio[V3020_RD].gpio, 0);
-	udelay(1);
-	bit = !!gpio_get_value(chip->gpio[V3020_IO].gpio);
-	udelay(1);
-	gpio_set_value(chip->gpio[V3020_RD].gpio, 1);
-	gpio_set_value(chip->gpio[V3020_CS].gpio, 1);
-
-	return bit;
-}
-
-static const struct v3020_chip_ops v3020_gpio_ops = {
-	.map_io		= v3020_gpio_map,
-	.unmap_io	= v3020_gpio_unmap,
-	.read_bit	= v3020_gpio_read_bit,
-	.write_bit	= v3020_gpio_write_bit,
-};
-
-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++) {
-		chip->ops->write_bit(chip, (tmp & 1));
-		tmp >>= 1;
-		udelay(1);
-	}
-
-	/* Commands dont have data */
-	if (!V3020_IS_COMMAND(address)) {
-		for (i = 0; i < 8; i++) {
-			chip->ops->write_bit(chip, (data & 1));
-			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++) {
-		chip->ops->write_bit(chip, (address & 1));
-		address >>= 1;
-		udelay(1);
-	}
-
-	for (i = 0; i < 8; i++) {
-		data >>= 1;
-		if (chip->ops->read_bit(chip))
-			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;
-
-	dev_dbg(dev, "\n%s : Read RTC values\n", __func__);
-	dev_dbg(dev, "tm_hour: %i\n", dt->tm_hour);
-	dev_dbg(dev, "tm_min : %i\n", dt->tm_min);
-	dev_dbg(dev, "tm_sec : %i\n", dt->tm_sec);
-	dev_dbg(dev, "tm_year: %i\n", dt->tm_year);
-	dev_dbg(dev, "tm_mon : %i\n", dt->tm_mon);
-	dev_dbg(dev, "tm_mday: %i\n", dt->tm_mday);
-	dev_dbg(dev, "tm_wday: %i\n", dt->tm_wday);
-
-	return 0;
-}
-
-
-static int v3020_set_time(struct device *dev, struct rtc_time *dt)
-{
-	struct v3020 *chip = dev_get_drvdata(dev);
-
-	dev_dbg(dev, "\n%s : Setting RTC values\n", __func__);
-	dev_dbg(dev, "tm_sec : %i\n", dt->tm_sec);
-	dev_dbg(dev, "tm_min : %i\n", dt->tm_min);
-	dev_dbg(dev, "tm_hour: %i\n", dt->tm_hour);
-	dev_dbg(dev, "tm_mday: %i\n", dt->tm_mday);
-	dev_dbg(dev, "tm_wday: %i\n", dt->tm_wday);
-	dev_dbg(dev, "tm_year: %i\n", dt->tm_year);
-
-	/* 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 = dev_get_platdata(&pdev->dev);
-	struct v3020 *chip;
-	int retval;
-	int i;
-
-	chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
-	if (!chip)
-		return -ENOMEM;
-
-	if (pdata->use_gpio)
-		chip->ops = &v3020_gpio_ops;
-	else
-		chip->ops = &v3020_mmio_ops;
-
-	retval = chip->ops->map_io(chip, pdev, pdata);
-	if (retval)
-		return retval;
-
-	/* Make sure the v3020 expects a communication cycle
-	 * by reading 8 times */
-	for (i = 0; i < 8; i++)
-		chip->ops->read_bit(chip);
-
-	/* 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 measurement mode, test modes, and lock
-	 * are all disabled */
-	v3020_set_reg(chip, V3020_STATUS_0, 0x0);
-
-	if (pdata->use_gpio)
-		dev_info(&pdev->dev, "Chip available at GPIOs "
-			 "%d, %d, %d, %d\n",
-			 chip->gpio[V3020_CS].gpio, chip->gpio[V3020_WR].gpio,
-			 chip->gpio[V3020_RD].gpio, chip->gpio[V3020_IO].gpio);
-	else
-		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);
-
-	chip->rtc = devm_rtc_device_register(&pdev->dev, "v3020",
-					&v3020_rtc_ops, THIS_MODULE);
-	if (IS_ERR(chip->rtc)) {
-		retval = PTR_ERR(chip->rtc);
-		goto err_io;
-	}
-
-	return 0;
-
-err_io:
-	chip->ops->unmap_io(chip);
-
-	return retval;
-}
-
-static int rtc_remove(struct platform_device *dev)
-{
-	struct v3020 *chip = platform_get_drvdata(dev);
-
-	chip->ops->unmap_io(chip);
-
-	return 0;
-}
-
-static struct platform_driver rtc_device_driver = {
-	.probe	= rtc_probe,
-	.remove = rtc_remove,
-	.driver = {
-		.name	= "v3020",
-	},
-};
-
-module_platform_driver(rtc_device_driver);
-
-MODULE_DESCRIPTION("V3020 RTC");
-MODULE_AUTHOR("Raphael Assenat");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:v3020");