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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/rtc/rtc-ds2404.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/rtc/rtc-ds2404.c')
-rw-r--r--drivers/rtc/rtc-ds2404.c225
1 files changed, 225 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-ds2404.c b/drivers/rtc/rtc-ds2404.c
new file mode 100644
index 0000000000..3231fd9f61
--- /dev/null
+++ b/drivers/rtc/rtc-ds2404.c
@@ -0,0 +1,225 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2012 Sven Schnelle <svens@stackframe.org>
+
+#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/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/slab.h>
+
+#include <linux/io.h>
+
+#define DS2404_STATUS_REG 0x200
+#define DS2404_CONTROL_REG 0x201
+#define DS2404_RTC_REG 0x202
+
+#define DS2404_WRITE_SCRATCHPAD_CMD 0x0f
+#define DS2404_READ_SCRATCHPAD_CMD 0xaa
+#define DS2404_COPY_SCRATCHPAD_CMD 0x55
+#define DS2404_READ_MEMORY_CMD 0xf0
+
+#define DS2404_RST 0
+#define DS2404_CLK 1
+#define DS2404_DQ 2
+
+struct ds2404 {
+ struct device *dev;
+ struct gpio_desc *rst_gpiod;
+ struct gpio_desc *clk_gpiod;
+ struct gpio_desc *dq_gpiod;
+ struct rtc_device *rtc;
+};
+
+static int ds2404_gpio_map(struct ds2404 *chip, struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+
+ /* This will de-assert RESET, declare this GPIO as GPIOD_ACTIVE_LOW */
+ chip->rst_gpiod = devm_gpiod_get(dev, "rst", GPIOD_OUT_LOW);
+ if (IS_ERR(chip->rst_gpiod))
+ return PTR_ERR(chip->rst_gpiod);
+
+ chip->clk_gpiod = devm_gpiod_get(dev, "clk", GPIOD_OUT_HIGH);
+ if (IS_ERR(chip->clk_gpiod))
+ return PTR_ERR(chip->clk_gpiod);
+
+ chip->dq_gpiod = devm_gpiod_get(dev, "dq", GPIOD_ASIS);
+ if (IS_ERR(chip->dq_gpiod))
+ return PTR_ERR(chip->dq_gpiod);
+
+ return 0;
+}
+
+static void ds2404_reset(struct ds2404 *chip)
+{
+ gpiod_set_value(chip->rst_gpiod, 1);
+ udelay(1000);
+ gpiod_set_value(chip->rst_gpiod, 0);
+ gpiod_set_value(chip->clk_gpiod, 0);
+ gpiod_direction_output(chip->dq_gpiod, 0);
+ udelay(10);
+}
+
+static void ds2404_write_byte(struct ds2404 *chip, u8 byte)
+{
+ int i;
+
+ gpiod_direction_output(chip->dq_gpiod, 1);
+ for (i = 0; i < 8; i++) {
+ gpiod_set_value(chip->dq_gpiod, byte & (1 << i));
+ udelay(10);
+ gpiod_set_value(chip->clk_gpiod, 1);
+ udelay(10);
+ gpiod_set_value(chip->clk_gpiod, 0);
+ udelay(10);
+ }
+}
+
+static u8 ds2404_read_byte(struct ds2404 *chip)
+{
+ int i;
+ u8 ret = 0;
+
+ gpiod_direction_input(chip->dq_gpiod);
+
+ for (i = 0; i < 8; i++) {
+ gpiod_set_value(chip->clk_gpiod, 0);
+ udelay(10);
+ if (gpiod_get_value(chip->dq_gpiod))
+ ret |= 1 << i;
+ gpiod_set_value(chip->clk_gpiod, 1);
+ udelay(10);
+ }
+ return ret;
+}
+
+static void ds2404_read_memory(struct ds2404 *chip, u16 offset,
+ int length, u8 *out)
+{
+ ds2404_reset(chip);
+ ds2404_write_byte(chip, DS2404_READ_MEMORY_CMD);
+ ds2404_write_byte(chip, offset & 0xff);
+ ds2404_write_byte(chip, (offset >> 8) & 0xff);
+ while (length--)
+ *out++ = ds2404_read_byte(chip);
+}
+
+static void ds2404_write_memory(struct ds2404 *chip, u16 offset,
+ int length, u8 *out)
+{
+ int i;
+ u8 ta01, ta02, es;
+
+ ds2404_reset(chip);
+ ds2404_write_byte(chip, DS2404_WRITE_SCRATCHPAD_CMD);
+ ds2404_write_byte(chip, offset & 0xff);
+ ds2404_write_byte(chip, (offset >> 8) & 0xff);
+
+ for (i = 0; i < length; i++)
+ ds2404_write_byte(chip, out[i]);
+
+ ds2404_reset(chip);
+ ds2404_write_byte(chip, DS2404_READ_SCRATCHPAD_CMD);
+
+ ta01 = ds2404_read_byte(chip);
+ ta02 = ds2404_read_byte(chip);
+ es = ds2404_read_byte(chip);
+
+ for (i = 0; i < length; i++) {
+ if (out[i] != ds2404_read_byte(chip)) {
+ dev_err(chip->dev, "read invalid data\n");
+ return;
+ }
+ }
+
+ ds2404_reset(chip);
+ ds2404_write_byte(chip, DS2404_COPY_SCRATCHPAD_CMD);
+ ds2404_write_byte(chip, ta01);
+ ds2404_write_byte(chip, ta02);
+ ds2404_write_byte(chip, es);
+
+ while (gpiod_get_value(chip->dq_gpiod))
+ ;
+}
+
+static void ds2404_enable_osc(struct ds2404 *chip)
+{
+ u8 in[1] = { 0x10 }; /* enable oscillator */
+
+ ds2404_write_memory(chip, 0x201, 1, in);
+}
+
+static int ds2404_read_time(struct device *dev, struct rtc_time *dt)
+{
+ struct ds2404 *chip = dev_get_drvdata(dev);
+ unsigned long time = 0;
+ __le32 hw_time = 0;
+
+ ds2404_read_memory(chip, 0x203, 4, (u8 *)&hw_time);
+ time = le32_to_cpu(hw_time);
+
+ rtc_time64_to_tm(time, dt);
+ return 0;
+}
+
+static int ds2404_set_time(struct device *dev, struct rtc_time *dt)
+{
+ struct ds2404 *chip = dev_get_drvdata(dev);
+ u32 time = cpu_to_le32(rtc_tm_to_time64(dt));
+ ds2404_write_memory(chip, 0x203, 4, (u8 *)&time);
+ return 0;
+}
+
+static const struct rtc_class_ops ds2404_rtc_ops = {
+ .read_time = ds2404_read_time,
+ .set_time = ds2404_set_time,
+};
+
+static int rtc_probe(struct platform_device *pdev)
+{
+ struct ds2404 *chip;
+ int retval = -EBUSY;
+
+ chip = devm_kzalloc(&pdev->dev, sizeof(struct ds2404), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ chip->dev = &pdev->dev;
+
+ chip->rtc = devm_rtc_allocate_device(&pdev->dev);
+ if (IS_ERR(chip->rtc))
+ return PTR_ERR(chip->rtc);
+
+ retval = ds2404_gpio_map(chip, pdev);
+ if (retval)
+ return retval;
+
+ platform_set_drvdata(pdev, chip);
+
+ chip->rtc->ops = &ds2404_rtc_ops;
+ chip->rtc->range_max = U32_MAX;
+
+ retval = devm_rtc_register_device(chip->rtc);
+ if (retval)
+ return retval;
+
+ ds2404_enable_osc(chip);
+ return 0;
+}
+
+static struct platform_driver rtc_device_driver = {
+ .probe = rtc_probe,
+ .driver = {
+ .name = "ds2404",
+ },
+};
+module_platform_driver(rtc_device_driver);
+
+MODULE_DESCRIPTION("DS2404 RTC");
+MODULE_AUTHOR("Sven Schnelle");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:ds2404");