286 lines
7.9 KiB
C
286 lines
7.9 KiB
C
|
/*
|
||
|
|
* 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 {
|
||
|
|
RP5C01_1_SECOND = 0x0, /* MODE 00 */
|
||
|
|
RP5C01_10_SECOND = 0x1, /* MODE 00 */
|
||
|
|
RP5C01_1_MINUTE = 0x2, /* MODE 00 and MODE 01 */
|
||
|
|
RP5C01_10_MINUTE = 0x3, /* MODE 00 and MODE 01 */
|
||
|
|
RP5C01_1_HOUR = 0x4, /* MODE 00 and MODE 01 */
|
||
|
|
RP5C01_10_HOUR = 0x5, /* MODE 00 and MODE 01 */
|
||
|
|
RP5C01_DAY_OF_WEEK = 0x6, /* MODE 00 and MODE 01 */
|
||
|
|
RP5C01_1_DAY = 0x7, /* MODE 00 and MODE 01 */
|
||
|
|
RP5C01_10_DAY = 0x8, /* MODE 00 and MODE 01 */
|
||
|
|
RP5C01_1_MONTH = 0x9, /* MODE 00 */
|
||
|
|
RP5C01_10_MONTH = 0xa, /* MODE 00 */
|
||
|
|
RP5C01_1_YEAR = 0xb, /* MODE 00 */
|
||
|
|
RP5C01_10_YEAR = 0xc, /* MODE 00 */
|
||
|
|
|
||
|
|
RP5C01_12_24_SELECT = 0xa, /* MODE 01 */
|
||
|
|
RP5C01_LEAP_YEAR = 0xb, /* MODE 01 */
|
||
|
|
|
||
|
|
RP5C01_MODE = 0xd, /* all modes */
|
||
|
|
RP5C01_TEST = 0xe, /* all modes */
|
||
|
|
RP5C01_RESET = 0xf, /* all modes */
|
||
|
|
};
|
||
|
|
|
||
|
|
#define RP5C01_12_24_SELECT_12 (0 << 0)
|
||
|
|
#define RP5C01_12_24_SELECT_24 (1 << 0)
|
||
|
|
|
||
|
|
#define RP5C01_10_HOUR_AM (0 << 1)
|
||
|
|
#define RP5C01_10_HOUR_PM (1 << 1)
|
||
|
|
|
||
|
|
#define RP5C01_MODE_TIMER_EN (1 << 3) /* timer enable */
|
||
|
|
#define RP5C01_MODE_ALARM_EN (1 << 2) /* alarm enable */
|
||
|
|
|
||
|
|
#define RP5C01_MODE_MODE_MASK (3 << 0)
|
||
|
|
#define RP5C01_MODE_MODE00 (0 << 0) /* time */
|
||
|
|
#define RP5C01_MODE_MODE01 (1 << 0) /* alarm, 12h/24h, leap year */
|
||
|
|
#define RP5C01_MODE_RAM_BLOCK10 (2 << 0) /* RAM 4 bits x 13 */
|
||
|
|
#define RP5C01_MODE_RAM_BLOCK11 (3 << 0) /* RAM 4 bits x 13 */
|
||
|
|
|
||
|
|
#define RP5C01_RESET_1HZ_PULSE (1 << 3)
|
||
|
|
#define RP5C01_RESET_16HZ_PULSE (1 << 2)
|
||
|
|
#define RP5C01_RESET_SECOND (1 << 1) /* reset divider stages for */
|
||
|
|
/* seconds or smaller units */
|
||
|
|
#define RP5C01_RESET_ALARM (1 << 0) /* reset all alarm registers */
|
||
|
|
|
||
|
|
|
||
|
|
struct rp5c01_priv {
|
||
|
|
u32 __iomem *regs;
|
||
|
|
struct rtc_device *rtc;
|
||
|
|
spinlock_t lock; /* against concurrent RTC/NVRAM access */
|
||
|
|
struct bin_attribute nvram_attr;
|
||
|
|
};
|
||
|
|
|
||
|
|
static inline unsigned int rp5c01_read(struct rp5c01_priv *priv,
|
||
|
|
unsigned int reg)
|
||
|
|
{
|
||
|
|
return __raw_readl(&priv->regs[reg]) & 0xf;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void rp5c01_write(struct rp5c01_priv *priv, unsigned int val,
|
||
|
|
unsigned int reg)
|
||
|
|
{
|
||
|
|
__raw_writel(val, &priv->regs[reg]);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void rp5c01_lock(struct rp5c01_priv *priv)
|
||
|
|
{
|
||
|
|
rp5c01_write(priv, RP5C01_MODE_MODE00, RP5C01_MODE);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void rp5c01_unlock(struct rp5c01_priv *priv)
|
||
|
|
{
|
||
|
|
rp5c01_write(priv, RP5C01_MODE_TIMER_EN | RP5C01_MODE_MODE01,
|
||
|
|
RP5C01_MODE);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int rp5c01_read_time(struct device *dev, struct rtc_time *tm)
|
||
|
|
{
|
||
|
|
struct rp5c01_priv *priv = dev_get_drvdata(dev);
|
||
|
|
|
||
|
|
spin_lock_irq(&priv->lock);
|
||
|
|
rp5c01_lock(priv);
|
||
|
|
|
||
|
|
tm->tm_sec = rp5c01_read(priv, RP5C01_10_SECOND) * 10 +
|
||
|
|
rp5c01_read(priv, RP5C01_1_SECOND);
|
||
|
|
tm->tm_min = rp5c01_read(priv, RP5C01_10_MINUTE) * 10 +
|
||
|
|
rp5c01_read(priv, RP5C01_1_MINUTE);
|
||
|
|
tm->tm_hour = rp5c01_read(priv, RP5C01_10_HOUR) * 10 +
|
||
|
|
rp5c01_read(priv, RP5C01_1_HOUR);
|
||
|
|
tm->tm_mday = rp5c01_read(priv, RP5C01_10_DAY) * 10 +
|
||
|
|
rp5c01_read(priv, RP5C01_1_DAY);
|
||
|
|
tm->tm_wday = rp5c01_read(priv, RP5C01_DAY_OF_WEEK);
|
||
|
|
tm->tm_mon = rp5c01_read(priv, RP5C01_10_MONTH) * 10 +
|
||
|
|
rp5c01_read(priv, RP5C01_1_MONTH) - 1;
|
||
|
|
tm->tm_year = rp5c01_read(priv, RP5C01_10_YEAR) * 10 +
|
||
|
|
rp5c01_read(priv, RP5C01_1_YEAR);
|
||
|
|
if (tm->tm_year <= 69)
|
||
|
|
tm->tm_year += 100;
|
||
|
|
|
||
|
|
rp5c01_unlock(priv);
|
||
|
|
spin_unlock_irq(&priv->lock);
|
||
|
|
|
||
|
|
return rtc_valid_tm(tm);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int rp5c01_set_time(struct device *dev, struct rtc_time *tm)
|
||
|
|
{
|
||
|
|
struct rp5c01_priv *priv = dev_get_drvdata(dev);
|
||
|
|
|
||
|
|
spin_lock_irq(&priv->lock);
|
||
|
|
rp5c01_lock(priv);
|
||
|
|
|
||
|
|
rp5c01_write(priv, tm->tm_sec / 10, RP5C01_10_SECOND);
|
||
|
|
rp5c01_write(priv, tm->tm_sec % 10, RP5C01_1_SECOND);
|
||
|
|
rp5c01_write(priv, tm->tm_min / 10, RP5C01_10_MINUTE);
|
||
|
|
rp5c01_write(priv, tm->tm_min % 10, RP5C01_1_MINUTE);
|
||
|
|
rp5c01_write(priv, tm->tm_hour / 10, RP5C01_10_HOUR);
|
||
|
|
rp5c01_write(priv, tm->tm_hour % 10, RP5C01_1_HOUR);
|
||
|
|
rp5c01_write(priv, tm->tm_mday / 10, RP5C01_10_DAY);
|
||
|
|
rp5c01_write(priv, tm->tm_mday % 10, RP5C01_1_DAY);
|
||
|
|
if (tm->tm_wday != -1)
|
||
|
|
rp5c01_write(priv, tm->tm_wday, RP5C01_DAY_OF_WEEK);
|
||
|
|
rp5c01_write(priv, (tm->tm_mon + 1) / 10, RP5C01_10_MONTH);
|
||
|
|
rp5c01_write(priv, (tm->tm_mon + 1) % 10, RP5C01_1_MONTH);
|
||
|
|
if (tm->tm_year >= 100)
|
||
|
|
tm->tm_year -= 100;
|
||
|
|
rp5c01_write(priv, tm->tm_year / 10, RP5C01_10_YEAR);
|
||
|
|
rp5c01_write(priv, tm->tm_year % 10, RP5C01_1_YEAR);
|
||
|
|
|
||
|
|
rp5c01_unlock(priv);
|
||
|
|
spin_unlock_irq(&priv->lock);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct rtc_class_ops rp5c01_rtc_ops = {
|
||
|
|
.read_time = rp5c01_read_time,
|
||
|
|
.set_time = rp5c01_set_time,
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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 ssize_t rp5c01_nvram_read(struct file *filp, struct kobject *kobj,
|
||
|
|
struct bin_attribute *bin_attr,
|
||
|
|
char *buf, loff_t pos, size_t size)
|
||
|
|
{
|
||
|
|
struct device *dev = container_of(kobj, struct device, kobj);
|
||
|
|
struct rp5c01_priv *priv = dev_get_drvdata(dev);
|
||
|
|
ssize_t count;
|
||
|
|
|
||
|
|
spin_lock_irq(&priv->lock);
|
||
|
|
|
||
|
|
for (count = 0; count < size; count++) {
|
||
|
|
u8 data;
|
||
|
|
|
||
|
|
rp5c01_write(priv,
|
||
|
|
RP5C01_MODE_TIMER_EN | RP5C01_MODE_RAM_BLOCK10,
|
||
|
|
RP5C01_MODE);
|
||
|
|
data = rp5c01_read(priv, pos) << 4;
|
||
|
|
rp5c01_write(priv,
|
||
|
|
RP5C01_MODE_TIMER_EN | RP5C01_MODE_RAM_BLOCK11,
|
||
|
|
RP5C01_MODE);
|
||
|
|
data |= rp5c01_read(priv, pos++);
|
||
|
|
rp5c01_write(priv, RP5C01_MODE_TIMER_EN | RP5C01_MODE_MODE01,
|
||
|
|
RP5C01_MODE);
|
||
|
|
*buf++ = data;
|
||
|
|
}
|
||
|
|
|
||
|
|
spin_unlock_irq(&priv->lock);
|
||
|
|
return count;
|
||
|
|
}
|
||
|
|
|
||
|
|
static ssize_t rp5c01_nvram_write(struct file *filp, struct kobject *kobj,
|
||
|
|
struct bin_attribute *bin_attr,
|
||
|
|
char *buf, loff_t pos, size_t size)
|
||
|
|
{
|
||
|
|
struct device *dev = container_of(kobj, struct device, kobj);
|
||
|
|
struct rp5c01_priv *priv = dev_get_drvdata(dev);
|
||
|
|
ssize_t count;
|
||
|
|
|
||
|
|
spin_lock_irq(&priv->lock);
|
||
|
|
|
||
|
|
for (count = 0; count < size; count++) {
|
||
|
|
u8 data = *buf++;
|
||
|
|
|
||
|
|
rp5c01_write(priv,
|
||
|
|
RP5C01_MODE_TIMER_EN | RP5C01_MODE_RAM_BLOCK10,
|
||
|
|
RP5C01_MODE);
|
||
|
|
rp5c01_write(priv, data >> 4, pos);
|
||
|
|
rp5c01_write(priv,
|
||
|
|
RP5C01_MODE_TIMER_EN | RP5C01_MODE_RAM_BLOCK11,
|
||
|
|
RP5C01_MODE);
|
||
|
|
rp5c01_write(priv, data & 0xf, pos++);
|
||
|
|
rp5c01_write(priv, RP5C01_MODE_TIMER_EN | RP5C01_MODE_MODE01,
|
||
|
|
RP5C01_MODE);
|
||
|
|
}
|
||
|
|
|
||
|
|
spin_unlock_irq(&priv->lock);
|
||
|
|
return count;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int __init rp5c01_rtc_probe(struct platform_device *dev)
|
||
|
|
{
|
||
|
|
struct resource *res;
|
||
|
|
struct rp5c01_priv *priv;
|
||
|
|
struct rtc_device *rtc;
|
||
|
|
int error;
|
||
|
|
|
||
|
|
res = platform_get_resource(dev, IORESOURCE_MEM, 0);
|
||
|
|
if (!res)
|
||
|
|
return -ENODEV;
|
||
|
|
|
||
|
|
priv = devm_kzalloc(&dev->dev, sizeof(*priv), GFP_KERNEL);
|
||
|
|
if (!priv)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
priv->regs = devm_ioremap(&dev->dev, res->start, resource_size(res));
|
||
|
|
if (!priv->regs)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
sysfs_bin_attr_init(&priv->nvram_attr);
|
||
|
|
priv->nvram_attr.attr.name = "nvram";
|
||
|
|
priv->nvram_attr.attr.mode = S_IRUGO | S_IWUSR;
|
||
|
|
priv->nvram_attr.read = rp5c01_nvram_read;
|
||
|
|
priv->nvram_attr.write = rp5c01_nvram_write;
|
||
|
|
priv->nvram_attr.size = RP5C01_MODE;
|
||
|
|
|
||
|
|
spin_lock_init(&priv->lock);
|
||
|
|
|
||
|
|
platform_set_drvdata(dev, priv);
|
||
|
|
|
||
|
|
rtc = devm_rtc_device_register(&dev->dev, "rtc-rp5c01", &rp5c01_rtc_ops,
|
||
|
|
THIS_MODULE);
|
||
|
|
if (IS_ERR(rtc))
|
||
|
|
return PTR_ERR(rtc);
|
||
|
|
priv->rtc = rtc;
|
||
|
|
|
||
|
|
error = sysfs_create_bin_file(&dev->dev.kobj, &priv->nvram_attr);
|
||
|
|
if (error)
|
||
|
|
return error;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int __exit rp5c01_rtc_remove(struct platform_device *dev)
|
||
|
|
{
|
||
|
|
struct rp5c01_priv *priv = platform_get_drvdata(dev);
|
||
|
|
|
||
|
|
sysfs_remove_bin_file(&dev->dev.kobj, &priv->nvram_attr);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct platform_driver rp5c01_rtc_driver = {
|
||
|
|
.driver = {
|
||
|
|
.name = "rtc-rp5c01",
|
||
|
|
},
|
||
|
|
.remove = __exit_p(rp5c01_rtc_remove),
|
||
|
|
};
|
||
|
|
|
||
|
|
module_platform_driver_probe(rp5c01_rtc_driver, rp5c01_rtc_probe);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>");
|
||
|
|
MODULE_LICENSE("GPL");
|
||
|
|
MODULE_DESCRIPTION("Ricoh RP5C01 RTC driver");
|
||
|
|
MODULE_ALIAS("platform:rtc-rp5c01");
|