511 строки
13 KiB
C
511 строки
13 KiB
C
/*
|
|
* Copyright 2004-2008 Freescale Semiconductor, Inc. All Rights Reserved.
|
|
*
|
|
* The code contained herein is licensed under the GNU General Public
|
|
* License. You may obtain a copy of the GNU General Public License
|
|
* Version 2 or later at the following locations:
|
|
*
|
|
* http://www.opensource.org/licenses/gpl-license.html
|
|
* http://www.gnu.org/copyleft/gpl.html
|
|
*/
|
|
|
|
#include <linux/io.h>
|
|
#include <linux/rtc.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/clk.h>
|
|
|
|
#define RTC_INPUT_CLK_32768HZ (0x00 << 5)
|
|
#define RTC_INPUT_CLK_32000HZ (0x01 << 5)
|
|
#define RTC_INPUT_CLK_38400HZ (0x02 << 5)
|
|
|
|
#define RTC_SW_BIT (1 << 0)
|
|
#define RTC_ALM_BIT (1 << 2)
|
|
#define RTC_1HZ_BIT (1 << 4)
|
|
#define RTC_2HZ_BIT (1 << 7)
|
|
#define RTC_SAM0_BIT (1 << 8)
|
|
#define RTC_SAM1_BIT (1 << 9)
|
|
#define RTC_SAM2_BIT (1 << 10)
|
|
#define RTC_SAM3_BIT (1 << 11)
|
|
#define RTC_SAM4_BIT (1 << 12)
|
|
#define RTC_SAM5_BIT (1 << 13)
|
|
#define RTC_SAM6_BIT (1 << 14)
|
|
#define RTC_SAM7_BIT (1 << 15)
|
|
#define PIT_ALL_ON (RTC_2HZ_BIT | RTC_SAM0_BIT | RTC_SAM1_BIT | \
|
|
RTC_SAM2_BIT | RTC_SAM3_BIT | RTC_SAM4_BIT | \
|
|
RTC_SAM5_BIT | RTC_SAM6_BIT | RTC_SAM7_BIT)
|
|
|
|
#define RTC_ENABLE_BIT (1 << 7)
|
|
|
|
#define MAX_PIE_NUM 9
|
|
#define MAX_PIE_FREQ 512
|
|
static const u32 PIE_BIT_DEF[MAX_PIE_NUM][2] = {
|
|
{ 2, RTC_2HZ_BIT },
|
|
{ 4, RTC_SAM0_BIT },
|
|
{ 8, RTC_SAM1_BIT },
|
|
{ 16, RTC_SAM2_BIT },
|
|
{ 32, RTC_SAM3_BIT },
|
|
{ 64, RTC_SAM4_BIT },
|
|
{ 128, RTC_SAM5_BIT },
|
|
{ 256, RTC_SAM6_BIT },
|
|
{ MAX_PIE_FREQ, RTC_SAM7_BIT },
|
|
};
|
|
|
|
#define MXC_RTC_TIME 0
|
|
#define MXC_RTC_ALARM 1
|
|
|
|
#define RTC_HOURMIN 0x00 /* 32bit rtc hour/min counter reg */
|
|
#define RTC_SECOND 0x04 /* 32bit rtc seconds counter reg */
|
|
#define RTC_ALRM_HM 0x08 /* 32bit rtc alarm hour/min reg */
|
|
#define RTC_ALRM_SEC 0x0C /* 32bit rtc alarm seconds reg */
|
|
#define RTC_RTCCTL 0x10 /* 32bit rtc control reg */
|
|
#define RTC_RTCISR 0x14 /* 32bit rtc interrupt status reg */
|
|
#define RTC_RTCIENR 0x18 /* 32bit rtc interrupt enable reg */
|
|
#define RTC_STPWCH 0x1C /* 32bit rtc stopwatch min reg */
|
|
#define RTC_DAYR 0x20 /* 32bit rtc days counter reg */
|
|
#define RTC_DAYALARM 0x24 /* 32bit rtc day alarm reg */
|
|
#define RTC_TEST1 0x28 /* 32bit rtc test reg 1 */
|
|
#define RTC_TEST2 0x2C /* 32bit rtc test reg 2 */
|
|
#define RTC_TEST3 0x30 /* 32bit rtc test reg 3 */
|
|
|
|
enum imx_rtc_type {
|
|
IMX1_RTC,
|
|
IMX21_RTC,
|
|
};
|
|
|
|
struct rtc_plat_data {
|
|
struct rtc_device *rtc;
|
|
void __iomem *ioaddr;
|
|
int irq;
|
|
struct clk *clk;
|
|
struct rtc_time g_rtc_alarm;
|
|
enum imx_rtc_type devtype;
|
|
};
|
|
|
|
static struct platform_device_id imx_rtc_devtype[] = {
|
|
{
|
|
.name = "imx1-rtc",
|
|
.driver_data = IMX1_RTC,
|
|
}, {
|
|
.name = "imx21-rtc",
|
|
.driver_data = IMX21_RTC,
|
|
}, {
|
|
/* sentinel */
|
|
}
|
|
};
|
|
MODULE_DEVICE_TABLE(platform, imx_rtc_devtype);
|
|
|
|
static inline int is_imx1_rtc(struct rtc_plat_data *data)
|
|
{
|
|
return data->devtype == IMX1_RTC;
|
|
}
|
|
|
|
/*
|
|
* This function is used to obtain the RTC time or the alarm value in
|
|
* second.
|
|
*/
|
|
static u32 get_alarm_or_time(struct device *dev, int time_alarm)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
|
|
void __iomem *ioaddr = pdata->ioaddr;
|
|
u32 day = 0, hr = 0, min = 0, sec = 0, hr_min = 0;
|
|
|
|
switch (time_alarm) {
|
|
case MXC_RTC_TIME:
|
|
day = readw(ioaddr + RTC_DAYR);
|
|
hr_min = readw(ioaddr + RTC_HOURMIN);
|
|
sec = readw(ioaddr + RTC_SECOND);
|
|
break;
|
|
case MXC_RTC_ALARM:
|
|
day = readw(ioaddr + RTC_DAYALARM);
|
|
hr_min = readw(ioaddr + RTC_ALRM_HM) & 0xffff;
|
|
sec = readw(ioaddr + RTC_ALRM_SEC);
|
|
break;
|
|
}
|
|
|
|
hr = hr_min >> 8;
|
|
min = hr_min & 0xff;
|
|
|
|
return (((day * 24 + hr) * 60) + min) * 60 + sec;
|
|
}
|
|
|
|
/*
|
|
* This function sets the RTC alarm value or the time value.
|
|
*/
|
|
static void set_alarm_or_time(struct device *dev, int time_alarm, u32 time)
|
|
{
|
|
u32 day, hr, min, sec, temp;
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
|
|
void __iomem *ioaddr = pdata->ioaddr;
|
|
|
|
day = time / 86400;
|
|
time -= day * 86400;
|
|
|
|
/* time is within a day now */
|
|
hr = time / 3600;
|
|
time -= hr * 3600;
|
|
|
|
/* time is within an hour now */
|
|
min = time / 60;
|
|
sec = time - min * 60;
|
|
|
|
temp = (hr << 8) + min;
|
|
|
|
switch (time_alarm) {
|
|
case MXC_RTC_TIME:
|
|
writew(day, ioaddr + RTC_DAYR);
|
|
writew(sec, ioaddr + RTC_SECOND);
|
|
writew(temp, ioaddr + RTC_HOURMIN);
|
|
break;
|
|
case MXC_RTC_ALARM:
|
|
writew(day, ioaddr + RTC_DAYALARM);
|
|
writew(sec, ioaddr + RTC_ALRM_SEC);
|
|
writew(temp, ioaddr + RTC_ALRM_HM);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This function updates the RTC alarm registers and then clears all the
|
|
* interrupt status bits.
|
|
*/
|
|
static int rtc_update_alarm(struct device *dev, struct rtc_time *alrm)
|
|
{
|
|
struct rtc_time alarm_tm, now_tm;
|
|
unsigned long now, time;
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
|
|
void __iomem *ioaddr = pdata->ioaddr;
|
|
|
|
now = get_alarm_or_time(dev, MXC_RTC_TIME);
|
|
rtc_time_to_tm(now, &now_tm);
|
|
alarm_tm.tm_year = now_tm.tm_year;
|
|
alarm_tm.tm_mon = now_tm.tm_mon;
|
|
alarm_tm.tm_mday = now_tm.tm_mday;
|
|
alarm_tm.tm_hour = alrm->tm_hour;
|
|
alarm_tm.tm_min = alrm->tm_min;
|
|
alarm_tm.tm_sec = alrm->tm_sec;
|
|
rtc_tm_to_time(&alarm_tm, &time);
|
|
|
|
/* clear all the interrupt status bits */
|
|
writew(readw(ioaddr + RTC_RTCISR), ioaddr + RTC_RTCISR);
|
|
set_alarm_or_time(dev, MXC_RTC_ALARM, time);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void mxc_rtc_irq_enable(struct device *dev, unsigned int bit,
|
|
unsigned int enabled)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
|
|
void __iomem *ioaddr = pdata->ioaddr;
|
|
u32 reg;
|
|
|
|
spin_lock_irq(&pdata->rtc->irq_lock);
|
|
reg = readw(ioaddr + RTC_RTCIENR);
|
|
|
|
if (enabled)
|
|
reg |= bit;
|
|
else
|
|
reg &= ~bit;
|
|
|
|
writew(reg, ioaddr + RTC_RTCIENR);
|
|
spin_unlock_irq(&pdata->rtc->irq_lock);
|
|
}
|
|
|
|
/* This function is the RTC interrupt service routine. */
|
|
static irqreturn_t mxc_rtc_interrupt(int irq, void *dev_id)
|
|
{
|
|
struct platform_device *pdev = dev_id;
|
|
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
|
|
void __iomem *ioaddr = pdata->ioaddr;
|
|
unsigned long flags;
|
|
u32 status;
|
|
u32 events = 0;
|
|
|
|
spin_lock_irqsave(&pdata->rtc->irq_lock, flags);
|
|
status = readw(ioaddr + RTC_RTCISR) & readw(ioaddr + RTC_RTCIENR);
|
|
/* clear interrupt sources */
|
|
writew(status, ioaddr + RTC_RTCISR);
|
|
|
|
/* update irq data & counter */
|
|
if (status & RTC_ALM_BIT) {
|
|
events |= (RTC_AF | RTC_IRQF);
|
|
/* RTC alarm should be one-shot */
|
|
mxc_rtc_irq_enable(&pdev->dev, RTC_ALM_BIT, 0);
|
|
}
|
|
|
|
if (status & RTC_1HZ_BIT)
|
|
events |= (RTC_UF | RTC_IRQF);
|
|
|
|
if (status & PIT_ALL_ON)
|
|
events |= (RTC_PF | RTC_IRQF);
|
|
|
|
rtc_update_irq(pdata->rtc, 1, events);
|
|
spin_unlock_irqrestore(&pdata->rtc->irq_lock, flags);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*
|
|
* Clear all interrupts and release the IRQ
|
|
*/
|
|
static void mxc_rtc_release(struct device *dev)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
|
|
void __iomem *ioaddr = pdata->ioaddr;
|
|
|
|
spin_lock_irq(&pdata->rtc->irq_lock);
|
|
|
|
/* Disable all rtc interrupts */
|
|
writew(0, ioaddr + RTC_RTCIENR);
|
|
|
|
/* Clear all interrupt status */
|
|
writew(0xffffffff, ioaddr + RTC_RTCISR);
|
|
|
|
spin_unlock_irq(&pdata->rtc->irq_lock);
|
|
}
|
|
|
|
static int mxc_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
|
|
{
|
|
mxc_rtc_irq_enable(dev, RTC_ALM_BIT, enabled);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This function reads the current RTC time into tm in Gregorian date.
|
|
*/
|
|
static int mxc_rtc_read_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
u32 val;
|
|
|
|
/* Avoid roll-over from reading the different registers */
|
|
do {
|
|
val = get_alarm_or_time(dev, MXC_RTC_TIME);
|
|
} while (val != get_alarm_or_time(dev, MXC_RTC_TIME));
|
|
|
|
rtc_time_to_tm(val, tm);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This function sets the internal RTC time based on tm in Gregorian date.
|
|
*/
|
|
static int mxc_rtc_set_mmss(struct device *dev, unsigned long time)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
|
|
|
|
/*
|
|
* TTC_DAYR register is 9-bit in MX1 SoC, save time and day of year only
|
|
*/
|
|
if (is_imx1_rtc(pdata)) {
|
|
struct rtc_time tm;
|
|
|
|
rtc_time_to_tm(time, &tm);
|
|
tm.tm_year = 70;
|
|
rtc_tm_to_time(&tm, &time);
|
|
}
|
|
|
|
/* Avoid roll-over from reading the different registers */
|
|
do {
|
|
set_alarm_or_time(dev, MXC_RTC_TIME, time);
|
|
} while (time != get_alarm_or_time(dev, MXC_RTC_TIME));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This function reads the current alarm value into the passed in 'alrm'
|
|
* argument. It updates the alrm's pending field value based on the whether
|
|
* an alarm interrupt occurs or not.
|
|
*/
|
|
static int mxc_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
|
|
void __iomem *ioaddr = pdata->ioaddr;
|
|
|
|
rtc_time_to_tm(get_alarm_or_time(dev, MXC_RTC_ALARM), &alrm->time);
|
|
alrm->pending = ((readw(ioaddr + RTC_RTCISR) & RTC_ALM_BIT)) ? 1 : 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This function sets the RTC alarm based on passed in alrm.
|
|
*/
|
|
static int mxc_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
|
|
int ret;
|
|
|
|
ret = rtc_update_alarm(dev, &alrm->time);
|
|
if (ret)
|
|
return ret;
|
|
|
|
memcpy(&pdata->g_rtc_alarm, &alrm->time, sizeof(struct rtc_time));
|
|
mxc_rtc_irq_enable(dev, RTC_ALM_BIT, alrm->enabled);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* RTC layer */
|
|
static struct rtc_class_ops mxc_rtc_ops = {
|
|
.release = mxc_rtc_release,
|
|
.read_time = mxc_rtc_read_time,
|
|
.set_mmss = mxc_rtc_set_mmss,
|
|
.read_alarm = mxc_rtc_read_alarm,
|
|
.set_alarm = mxc_rtc_set_alarm,
|
|
.alarm_irq_enable = mxc_rtc_alarm_irq_enable,
|
|
};
|
|
|
|
static int mxc_rtc_probe(struct platform_device *pdev)
|
|
{
|
|
struct resource *res;
|
|
struct rtc_device *rtc;
|
|
struct rtc_plat_data *pdata = NULL;
|
|
u32 reg;
|
|
unsigned long rate;
|
|
int ret;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!res)
|
|
return -ENODEV;
|
|
|
|
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
|
|
if (!pdata)
|
|
return -ENOMEM;
|
|
|
|
pdata->devtype = pdev->id_entry->driver_data;
|
|
|
|
if (!devm_request_mem_region(&pdev->dev, res->start,
|
|
resource_size(res), pdev->name))
|
|
return -EBUSY;
|
|
|
|
pdata->ioaddr = devm_ioremap(&pdev->dev, res->start,
|
|
resource_size(res));
|
|
|
|
pdata->clk = devm_clk_get(&pdev->dev, NULL);
|
|
if (IS_ERR(pdata->clk)) {
|
|
dev_err(&pdev->dev, "unable to get clock!\n");
|
|
ret = PTR_ERR(pdata->clk);
|
|
goto exit_free_pdata;
|
|
}
|
|
|
|
clk_prepare_enable(pdata->clk);
|
|
rate = clk_get_rate(pdata->clk);
|
|
|
|
if (rate == 32768)
|
|
reg = RTC_INPUT_CLK_32768HZ;
|
|
else if (rate == 32000)
|
|
reg = RTC_INPUT_CLK_32000HZ;
|
|
else if (rate == 38400)
|
|
reg = RTC_INPUT_CLK_38400HZ;
|
|
else {
|
|
dev_err(&pdev->dev, "rtc clock is not valid (%lu)\n", rate);
|
|
ret = -EINVAL;
|
|
goto exit_put_clk;
|
|
}
|
|
|
|
reg |= RTC_ENABLE_BIT;
|
|
writew(reg, (pdata->ioaddr + RTC_RTCCTL));
|
|
if (((readw(pdata->ioaddr + RTC_RTCCTL)) & RTC_ENABLE_BIT) == 0) {
|
|
dev_err(&pdev->dev, "hardware module can't be enabled!\n");
|
|
ret = -EIO;
|
|
goto exit_put_clk;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, pdata);
|
|
|
|
/* Configure and enable the RTC */
|
|
pdata->irq = platform_get_irq(pdev, 0);
|
|
|
|
if (pdata->irq >= 0 &&
|
|
devm_request_irq(&pdev->dev, pdata->irq, mxc_rtc_interrupt,
|
|
IRQF_SHARED, pdev->name, pdev) < 0) {
|
|
dev_warn(&pdev->dev, "interrupt not available.\n");
|
|
pdata->irq = -1;
|
|
}
|
|
|
|
if (pdata->irq >= 0)
|
|
device_init_wakeup(&pdev->dev, 1);
|
|
|
|
rtc = devm_rtc_device_register(&pdev->dev, pdev->name, &mxc_rtc_ops,
|
|
THIS_MODULE);
|
|
if (IS_ERR(rtc)) {
|
|
ret = PTR_ERR(rtc);
|
|
goto exit_put_clk;
|
|
}
|
|
|
|
pdata->rtc = rtc;
|
|
|
|
return 0;
|
|
|
|
exit_put_clk:
|
|
clk_disable_unprepare(pdata->clk);
|
|
|
|
exit_free_pdata:
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int mxc_rtc_remove(struct platform_device *pdev)
|
|
{
|
|
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
|
|
|
|
clk_disable_unprepare(pdata->clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int mxc_rtc_suspend(struct device *dev)
|
|
{
|
|
struct rtc_plat_data *pdata = dev_get_drvdata(dev);
|
|
|
|
if (device_may_wakeup(dev))
|
|
enable_irq_wake(pdata->irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mxc_rtc_resume(struct device *dev)
|
|
{
|
|
struct rtc_plat_data *pdata = dev_get_drvdata(dev);
|
|
|
|
if (device_may_wakeup(dev))
|
|
disable_irq_wake(pdata->irq);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(mxc_rtc_pm_ops, mxc_rtc_suspend, mxc_rtc_resume);
|
|
|
|
static struct platform_driver mxc_rtc_driver = {
|
|
.driver = {
|
|
.name = "mxc_rtc",
|
|
.pm = &mxc_rtc_pm_ops,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.id_table = imx_rtc_devtype,
|
|
.probe = mxc_rtc_probe,
|
|
.remove = mxc_rtc_remove,
|
|
};
|
|
|
|
module_platform_driver(mxc_rtc_driver)
|
|
|
|
MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
|
|
MODULE_DESCRIPTION("RTC driver for Freescale MXC");
|
|
MODULE_LICENSE("GPL");
|
|
|