linux/drivers/rtc/rtc-rp5c01.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  Ricoh RP5C01 RTC Driver
 *
 *  Copyright 2009 Geert Uytterhoeven
 *
 *  Based on the A3000 TOD code in arch/m68k/amiga/config.c
 *  Copyright (C) 1993 Hamish Macdonald
 */

#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/rtc.h>
#include <linux/slab.h>


enum { … };

#define RP5C01_12_24_SELECT_12 …
#define RP5C01_12_24_SELECT_24 …

#define RP5C01_10_HOUR_AM …
#define RP5C01_10_HOUR_PM …

#define RP5C01_MODE_TIMER_EN …
#define RP5C01_MODE_ALARM_EN …

#define RP5C01_MODE_MODE_MASK …
#define RP5C01_MODE_MODE00 …
#define RP5C01_MODE_MODE01 …
#define RP5C01_MODE_RAM_BLOCK10 …
#define RP5C01_MODE_RAM_BLOCK11 …

#define RP5C01_RESET_1HZ_PULSE …
#define RP5C01_RESET_16HZ_PULSE …
#define RP5C01_RESET_SECOND …
						/* seconds or smaller units */
#define RP5C01_RESET_ALARM …


struct rp5c01_priv { … };

static inline unsigned int rp5c01_read(struct rp5c01_priv *priv,
				       unsigned int reg)
{ … }

static inline void rp5c01_write(struct rp5c01_priv *priv, unsigned int val,
				unsigned int reg)
{ … }

static void rp5c01_lock(struct rp5c01_priv *priv)
{ … }

static void rp5c01_unlock(struct rp5c01_priv *priv)
{ … }

static int rp5c01_read_time(struct device *dev, struct rtc_time *tm)
{ … }

static int rp5c01_set_time(struct device *dev, struct rtc_time *tm)
{ … }

static const struct rtc_class_ops rp5c01_rtc_ops = …;


/*
 * The NVRAM is organized as 2 blocks of 13 nibbles of 4 bits.
 * We provide access to them like AmigaOS does: the high nibble of each 8-bit
 * byte is stored in BLOCK10, the low nibble in BLOCK11.
 */

static int rp5c01_nvram_read(void *_priv, unsigned int pos, void *val,
			     size_t bytes)
{ … }

static int rp5c01_nvram_write(void *_priv, unsigned int pos, void *val,
			      size_t bytes)
{ … }

static int __init rp5c01_rtc_probe(struct platform_device *dev)
{ … }

static struct platform_driver rp5c01_rtc_driver = …;

module_platform_driver_probe(…);

MODULE_AUTHOR(…) …;
MODULE_LICENSE(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_ALIAS(…) …;