forked from Minki/linux
22652ba724
The RTC core is always calling rtc_valid_tm after the read_time callback. It is not necessary to call it just before returning from the callback. Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
516 lines
14 KiB
C
516 lines
14 KiB
C
/*
|
|
* ST M48T59 RTC driver
|
|
*
|
|
* Copyright (c) 2007 Wind River Systems, Inc.
|
|
*
|
|
* Author: Mark Zhan <rongkai.zhan@windriver.com>
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/io.h>
|
|
#include <linux/device.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/rtc.h>
|
|
#include <linux/rtc/m48t59.h>
|
|
#include <linux/bcd.h>
|
|
#include <linux/slab.h>
|
|
|
|
#ifndef NO_IRQ
|
|
#define NO_IRQ (-1)
|
|
#endif
|
|
|
|
#define M48T59_READ(reg) (pdata->read_byte(dev, pdata->offset + reg))
|
|
#define M48T59_WRITE(val, reg) \
|
|
(pdata->write_byte(dev, pdata->offset + reg, val))
|
|
|
|
#define M48T59_SET_BITS(mask, reg) \
|
|
M48T59_WRITE((M48T59_READ(reg) | (mask)), (reg))
|
|
#define M48T59_CLEAR_BITS(mask, reg) \
|
|
M48T59_WRITE((M48T59_READ(reg) & ~(mask)), (reg))
|
|
|
|
struct m48t59_private {
|
|
void __iomem *ioaddr;
|
|
int irq;
|
|
struct rtc_device *rtc;
|
|
spinlock_t lock; /* serialize the NVRAM and RTC access */
|
|
};
|
|
|
|
/*
|
|
* This is the generic access method when the chip is memory-mapped
|
|
*/
|
|
static void
|
|
m48t59_mem_writeb(struct device *dev, u32 ofs, u8 val)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
|
|
|
|
writeb(val, m48t59->ioaddr+ofs);
|
|
}
|
|
|
|
static u8
|
|
m48t59_mem_readb(struct device *dev, u32 ofs)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
|
|
|
|
return readb(m48t59->ioaddr+ofs);
|
|
}
|
|
|
|
/*
|
|
* NOTE: M48T59 only uses BCD mode
|
|
*/
|
|
static int m48t59_rtc_read_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct m48t59_plat_data *pdata = dev_get_platdata(&pdev->dev);
|
|
struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
|
|
unsigned long flags;
|
|
u8 val;
|
|
|
|
spin_lock_irqsave(&m48t59->lock, flags);
|
|
/* Issue the READ command */
|
|
M48T59_SET_BITS(M48T59_CNTL_READ, M48T59_CNTL);
|
|
|
|
tm->tm_year = bcd2bin(M48T59_READ(M48T59_YEAR));
|
|
/* tm_mon is 0-11 */
|
|
tm->tm_mon = bcd2bin(M48T59_READ(M48T59_MONTH)) - 1;
|
|
tm->tm_mday = bcd2bin(M48T59_READ(M48T59_MDAY));
|
|
|
|
val = M48T59_READ(M48T59_WDAY);
|
|
if ((pdata->type == M48T59RTC_TYPE_M48T59) &&
|
|
(val & M48T59_WDAY_CEB) && (val & M48T59_WDAY_CB)) {
|
|
dev_dbg(dev, "Century bit is enabled\n");
|
|
tm->tm_year += 100; /* one century */
|
|
}
|
|
#ifdef CONFIG_SPARC
|
|
/* Sun SPARC machines count years since 1968 */
|
|
tm->tm_year += 68;
|
|
#endif
|
|
|
|
tm->tm_wday = bcd2bin(val & 0x07);
|
|
tm->tm_hour = bcd2bin(M48T59_READ(M48T59_HOUR) & 0x3F);
|
|
tm->tm_min = bcd2bin(M48T59_READ(M48T59_MIN) & 0x7F);
|
|
tm->tm_sec = bcd2bin(M48T59_READ(M48T59_SEC) & 0x7F);
|
|
|
|
/* Clear the READ bit */
|
|
M48T59_CLEAR_BITS(M48T59_CNTL_READ, M48T59_CNTL);
|
|
spin_unlock_irqrestore(&m48t59->lock, flags);
|
|
|
|
dev_dbg(dev, "RTC read time %04d-%02d-%02d %02d/%02d/%02d\n",
|
|
tm->tm_year + 1900, tm->tm_mon, tm->tm_mday,
|
|
tm->tm_hour, tm->tm_min, tm->tm_sec);
|
|
return 0;
|
|
}
|
|
|
|
static int m48t59_rtc_set_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct m48t59_plat_data *pdata = dev_get_platdata(&pdev->dev);
|
|
struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
|
|
unsigned long flags;
|
|
u8 val = 0;
|
|
int year = tm->tm_year;
|
|
|
|
#ifdef CONFIG_SPARC
|
|
/* Sun SPARC machines count years since 1968 */
|
|
year -= 68;
|
|
#endif
|
|
|
|
dev_dbg(dev, "RTC set time %04d-%02d-%02d %02d/%02d/%02d\n",
|
|
year + 1900, tm->tm_mon, tm->tm_mday,
|
|
tm->tm_hour, tm->tm_min, tm->tm_sec);
|
|
|
|
if (year < 0)
|
|
return -EINVAL;
|
|
|
|
spin_lock_irqsave(&m48t59->lock, flags);
|
|
/* Issue the WRITE command */
|
|
M48T59_SET_BITS(M48T59_CNTL_WRITE, M48T59_CNTL);
|
|
|
|
M48T59_WRITE((bin2bcd(tm->tm_sec) & 0x7F), M48T59_SEC);
|
|
M48T59_WRITE((bin2bcd(tm->tm_min) & 0x7F), M48T59_MIN);
|
|
M48T59_WRITE((bin2bcd(tm->tm_hour) & 0x3F), M48T59_HOUR);
|
|
M48T59_WRITE((bin2bcd(tm->tm_mday) & 0x3F), M48T59_MDAY);
|
|
/* tm_mon is 0-11 */
|
|
M48T59_WRITE((bin2bcd(tm->tm_mon + 1) & 0x1F), M48T59_MONTH);
|
|
M48T59_WRITE(bin2bcd(year % 100), M48T59_YEAR);
|
|
|
|
if (pdata->type == M48T59RTC_TYPE_M48T59 && (year / 100))
|
|
val = (M48T59_WDAY_CEB | M48T59_WDAY_CB);
|
|
val |= (bin2bcd(tm->tm_wday) & 0x07);
|
|
M48T59_WRITE(val, M48T59_WDAY);
|
|
|
|
/* Clear the WRITE bit */
|
|
M48T59_CLEAR_BITS(M48T59_CNTL_WRITE, M48T59_CNTL);
|
|
spin_unlock_irqrestore(&m48t59->lock, flags);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Read alarm time and date in RTC
|
|
*/
|
|
static int m48t59_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct m48t59_plat_data *pdata = dev_get_platdata(&pdev->dev);
|
|
struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
|
|
struct rtc_time *tm = &alrm->time;
|
|
unsigned long flags;
|
|
u8 val;
|
|
|
|
/* If no irq, we don't support ALARM */
|
|
if (m48t59->irq == NO_IRQ)
|
|
return -EIO;
|
|
|
|
spin_lock_irqsave(&m48t59->lock, flags);
|
|
/* Issue the READ command */
|
|
M48T59_SET_BITS(M48T59_CNTL_READ, M48T59_CNTL);
|
|
|
|
tm->tm_year = bcd2bin(M48T59_READ(M48T59_YEAR));
|
|
#ifdef CONFIG_SPARC
|
|
/* Sun SPARC machines count years since 1968 */
|
|
tm->tm_year += 68;
|
|
#endif
|
|
/* tm_mon is 0-11 */
|
|
tm->tm_mon = bcd2bin(M48T59_READ(M48T59_MONTH)) - 1;
|
|
|
|
val = M48T59_READ(M48T59_WDAY);
|
|
if ((val & M48T59_WDAY_CEB) && (val & M48T59_WDAY_CB))
|
|
tm->tm_year += 100; /* one century */
|
|
|
|
tm->tm_mday = bcd2bin(M48T59_READ(M48T59_ALARM_DATE));
|
|
tm->tm_hour = bcd2bin(M48T59_READ(M48T59_ALARM_HOUR));
|
|
tm->tm_min = bcd2bin(M48T59_READ(M48T59_ALARM_MIN));
|
|
tm->tm_sec = bcd2bin(M48T59_READ(M48T59_ALARM_SEC));
|
|
|
|
/* Clear the READ bit */
|
|
M48T59_CLEAR_BITS(M48T59_CNTL_READ, M48T59_CNTL);
|
|
spin_unlock_irqrestore(&m48t59->lock, flags);
|
|
|
|
dev_dbg(dev, "RTC read alarm time %04d-%02d-%02d %02d/%02d/%02d\n",
|
|
tm->tm_year + 1900, tm->tm_mon, tm->tm_mday,
|
|
tm->tm_hour, tm->tm_min, tm->tm_sec);
|
|
return rtc_valid_tm(tm);
|
|
}
|
|
|
|
/*
|
|
* Set alarm time and date in RTC
|
|
*/
|
|
static int m48t59_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct m48t59_plat_data *pdata = dev_get_platdata(&pdev->dev);
|
|
struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
|
|
struct rtc_time *tm = &alrm->time;
|
|
u8 mday, hour, min, sec;
|
|
unsigned long flags;
|
|
int year = tm->tm_year;
|
|
|
|
#ifdef CONFIG_SPARC
|
|
/* Sun SPARC machines count years since 1968 */
|
|
year -= 68;
|
|
#endif
|
|
|
|
/* If no irq, we don't support ALARM */
|
|
if (m48t59->irq == NO_IRQ)
|
|
return -EIO;
|
|
|
|
if (year < 0)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* 0xff means "always match"
|
|
*/
|
|
mday = tm->tm_mday;
|
|
mday = (mday >= 1 && mday <= 31) ? bin2bcd(mday) : 0xff;
|
|
if (mday == 0xff)
|
|
mday = M48T59_READ(M48T59_MDAY);
|
|
|
|
hour = tm->tm_hour;
|
|
hour = (hour < 24) ? bin2bcd(hour) : 0x00;
|
|
|
|
min = tm->tm_min;
|
|
min = (min < 60) ? bin2bcd(min) : 0x00;
|
|
|
|
sec = tm->tm_sec;
|
|
sec = (sec < 60) ? bin2bcd(sec) : 0x00;
|
|
|
|
spin_lock_irqsave(&m48t59->lock, flags);
|
|
/* Issue the WRITE command */
|
|
M48T59_SET_BITS(M48T59_CNTL_WRITE, M48T59_CNTL);
|
|
|
|
M48T59_WRITE(mday, M48T59_ALARM_DATE);
|
|
M48T59_WRITE(hour, M48T59_ALARM_HOUR);
|
|
M48T59_WRITE(min, M48T59_ALARM_MIN);
|
|
M48T59_WRITE(sec, M48T59_ALARM_SEC);
|
|
|
|
/* Clear the WRITE bit */
|
|
M48T59_CLEAR_BITS(M48T59_CNTL_WRITE, M48T59_CNTL);
|
|
spin_unlock_irqrestore(&m48t59->lock, flags);
|
|
|
|
dev_dbg(dev, "RTC set alarm time %04d-%02d-%02d %02d/%02d/%02d\n",
|
|
year + 1900, tm->tm_mon, tm->tm_mday,
|
|
tm->tm_hour, tm->tm_min, tm->tm_sec);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Handle commands from user-space
|
|
*/
|
|
static int m48t59_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct m48t59_plat_data *pdata = dev_get_platdata(&pdev->dev);
|
|
struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&m48t59->lock, flags);
|
|
if (enabled)
|
|
M48T59_WRITE(M48T59_INTR_AFE, M48T59_INTR);
|
|
else
|
|
M48T59_WRITE(0x00, M48T59_INTR);
|
|
spin_unlock_irqrestore(&m48t59->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int m48t59_rtc_proc(struct device *dev, struct seq_file *seq)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct m48t59_plat_data *pdata = dev_get_platdata(&pdev->dev);
|
|
struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
|
|
unsigned long flags;
|
|
u8 val;
|
|
|
|
spin_lock_irqsave(&m48t59->lock, flags);
|
|
val = M48T59_READ(M48T59_FLAGS);
|
|
spin_unlock_irqrestore(&m48t59->lock, flags);
|
|
|
|
seq_printf(seq, "battery\t\t: %s\n",
|
|
(val & M48T59_FLAGS_BF) ? "low" : "normal");
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* IRQ handler for the RTC
|
|
*/
|
|
static irqreturn_t m48t59_rtc_interrupt(int irq, void *dev_id)
|
|
{
|
|
struct device *dev = (struct device *)dev_id;
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct m48t59_plat_data *pdata = dev_get_platdata(&pdev->dev);
|
|
struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
|
|
u8 event;
|
|
|
|
spin_lock(&m48t59->lock);
|
|
event = M48T59_READ(M48T59_FLAGS);
|
|
spin_unlock(&m48t59->lock);
|
|
|
|
if (event & M48T59_FLAGS_AF) {
|
|
rtc_update_irq(m48t59->rtc, 1, (RTC_AF | RTC_IRQF));
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
static const struct rtc_class_ops m48t59_rtc_ops = {
|
|
.read_time = m48t59_rtc_read_time,
|
|
.set_time = m48t59_rtc_set_time,
|
|
.read_alarm = m48t59_rtc_readalarm,
|
|
.set_alarm = m48t59_rtc_setalarm,
|
|
.proc = m48t59_rtc_proc,
|
|
.alarm_irq_enable = m48t59_rtc_alarm_irq_enable,
|
|
};
|
|
|
|
static const struct rtc_class_ops m48t02_rtc_ops = {
|
|
.read_time = m48t59_rtc_read_time,
|
|
.set_time = m48t59_rtc_set_time,
|
|
};
|
|
|
|
static int m48t59_nvram_read(void *priv, unsigned int offset, void *val,
|
|
size_t size)
|
|
{
|
|
struct platform_device *pdev = priv;
|
|
struct device *dev = &pdev->dev;
|
|
struct m48t59_plat_data *pdata = dev_get_platdata(&pdev->dev);
|
|
struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
|
|
ssize_t cnt = 0;
|
|
unsigned long flags;
|
|
u8 *buf = val;
|
|
|
|
spin_lock_irqsave(&m48t59->lock, flags);
|
|
|
|
for (; cnt < size; cnt++)
|
|
*buf++ = M48T59_READ(cnt);
|
|
|
|
spin_unlock_irqrestore(&m48t59->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int m48t59_nvram_write(void *priv, unsigned int offset, void *val,
|
|
size_t size)
|
|
{
|
|
struct platform_device *pdev = priv;
|
|
struct device *dev = &pdev->dev;
|
|
struct m48t59_plat_data *pdata = dev_get_platdata(&pdev->dev);
|
|
struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
|
|
ssize_t cnt = 0;
|
|
unsigned long flags;
|
|
u8 *buf = val;
|
|
|
|
spin_lock_irqsave(&m48t59->lock, flags);
|
|
|
|
for (; cnt < size; cnt++)
|
|
M48T59_WRITE(*buf++, cnt);
|
|
|
|
spin_unlock_irqrestore(&m48t59->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int m48t59_rtc_probe(struct platform_device *pdev)
|
|
{
|
|
struct m48t59_plat_data *pdata = dev_get_platdata(&pdev->dev);
|
|
struct m48t59_private *m48t59 = NULL;
|
|
struct resource *res;
|
|
int ret = -ENOMEM;
|
|
char *name;
|
|
const struct rtc_class_ops *ops;
|
|
struct nvmem_config nvmem_cfg = {
|
|
.name = "m48t59-",
|
|
.word_size = 1,
|
|
.stride = 1,
|
|
.reg_read = m48t59_nvram_read,
|
|
.reg_write = m48t59_nvram_write,
|
|
.priv = pdev,
|
|
};
|
|
|
|
/* This chip could be memory-mapped or I/O-mapped */
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!res) {
|
|
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
|
|
if (!res)
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (res->flags & IORESOURCE_IO) {
|
|
/* If we are I/O-mapped, the platform should provide
|
|
* the operations accessing chip registers.
|
|
*/
|
|
if (!pdata || !pdata->write_byte || !pdata->read_byte)
|
|
return -EINVAL;
|
|
} else if (res->flags & IORESOURCE_MEM) {
|
|
/* we are memory-mapped */
|
|
if (!pdata) {
|
|
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata),
|
|
GFP_KERNEL);
|
|
if (!pdata)
|
|
return -ENOMEM;
|
|
/* Ensure we only kmalloc platform data once */
|
|
pdev->dev.platform_data = pdata;
|
|
}
|
|
if (!pdata->type)
|
|
pdata->type = M48T59RTC_TYPE_M48T59;
|
|
|
|
/* Try to use the generic memory read/write ops */
|
|
if (!pdata->write_byte)
|
|
pdata->write_byte = m48t59_mem_writeb;
|
|
if (!pdata->read_byte)
|
|
pdata->read_byte = m48t59_mem_readb;
|
|
}
|
|
|
|
m48t59 = devm_kzalloc(&pdev->dev, sizeof(*m48t59), GFP_KERNEL);
|
|
if (!m48t59)
|
|
return -ENOMEM;
|
|
|
|
m48t59->ioaddr = pdata->ioaddr;
|
|
|
|
if (!m48t59->ioaddr) {
|
|
/* ioaddr not mapped externally */
|
|
m48t59->ioaddr = devm_ioremap(&pdev->dev, res->start,
|
|
resource_size(res));
|
|
if (!m48t59->ioaddr)
|
|
return ret;
|
|
}
|
|
|
|
/* Try to get irq number. We also can work in
|
|
* the mode without IRQ.
|
|
*/
|
|
m48t59->irq = platform_get_irq(pdev, 0);
|
|
if (m48t59->irq <= 0)
|
|
m48t59->irq = NO_IRQ;
|
|
|
|
if (m48t59->irq != NO_IRQ) {
|
|
ret = devm_request_irq(&pdev->dev, m48t59->irq,
|
|
m48t59_rtc_interrupt, IRQF_SHARED,
|
|
"rtc-m48t59", &pdev->dev);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
switch (pdata->type) {
|
|
case M48T59RTC_TYPE_M48T59:
|
|
name = "m48t59";
|
|
ops = &m48t59_rtc_ops;
|
|
pdata->offset = 0x1ff0;
|
|
break;
|
|
case M48T59RTC_TYPE_M48T02:
|
|
name = "m48t02";
|
|
ops = &m48t02_rtc_ops;
|
|
pdata->offset = 0x7f0;
|
|
break;
|
|
case M48T59RTC_TYPE_M48T08:
|
|
name = "m48t08";
|
|
ops = &m48t02_rtc_ops;
|
|
pdata->offset = 0x1ff0;
|
|
break;
|
|
default:
|
|
dev_err(&pdev->dev, "Unknown RTC type\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
spin_lock_init(&m48t59->lock);
|
|
platform_set_drvdata(pdev, m48t59);
|
|
|
|
m48t59->rtc = devm_rtc_allocate_device(&pdev->dev);
|
|
if (IS_ERR(m48t59->rtc))
|
|
return PTR_ERR(m48t59->rtc);
|
|
|
|
m48t59->rtc->nvram_old_abi = true;
|
|
m48t59->rtc->ops = ops;
|
|
|
|
nvmem_cfg.size = pdata->offset;
|
|
ret = rtc_nvmem_register(m48t59->rtc, &nvmem_cfg);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = rtc_register_device(m48t59->rtc);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* work with hotplug and coldplug */
|
|
MODULE_ALIAS("platform:rtc-m48t59");
|
|
|
|
static struct platform_driver m48t59_rtc_driver = {
|
|
.driver = {
|
|
.name = "rtc-m48t59",
|
|
},
|
|
.probe = m48t59_rtc_probe,
|
|
};
|
|
|
|
module_platform_driver(m48t59_rtc_driver);
|
|
|
|
MODULE_AUTHOR("Mark Zhan <rongkai.zhan@windriver.com>");
|
|
MODULE_DESCRIPTION("M48T59/M48T02/M48T08 RTC driver");
|
|
MODULE_LICENSE("GPL");
|