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BSP 최초 추가
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#include <linux/io.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/rtc.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <linux/of.h>
#define DTCMR 0x00 /* Time Counter MSB Reg */
#define DTCLR 0x04 /* Time Counter LSB Reg */
#define DCAMR 0x08 /* Clock Alarm MSB Reg */
#define DCALR 0x0c /* Clock Alarm LSB Reg */
#define DCAMR_UNSET 0xFFFFFFFF /* doomsday - 1 sec */
#define DCR 0x10 /* Control Reg */
#define DCR_TCE (1 << 3) /* Time Counter Enable */
#define DSR 0x14 /* Status Reg */
#define DSR_WBF (1 << 10) /* Write Busy Flag */
#define DSR_WNF (1 << 9) /* Write Next Flag */
#define DSR_WCF (1 << 8) /* Write Complete Flag */
#define DSR_WEF (1 << 7) /* Write Error Flag */
#define DSR_CAF (1 << 4) /* Clock Alarm Flag */
#define DSR_NVF (1 << 1) /* Non-Valid Flag */
#define DSR_SVF (1 << 0) /* Security Violation Flag */
#define DIER 0x18 /* Interrupt Enable Reg */
#define DIER_WNIE (1 << 9) /* Write Next Interrupt Enable */
#define DIER_WCIE (1 << 8) /* Write Complete Interrupt Enable */
#define DIER_WEIE (1 << 7) /* Write Error Interrupt Enable */
#define DIER_CAIE (1 << 4) /* Clock Alarm Interrupt Enable */
struct imxdi_dev {
struct platform_device *pdev;
struct rtc_device *rtc;
void __iomem *ioaddr;
int irq;
struct clk *clk;
u32 dsr;
spinlock_t irq_lock;
wait_queue_head_t write_wait;
struct mutex write_mutex;
struct work_struct work;
};
static void di_int_enable(struct imxdi_dev *imxdi, u32 intr)
{
unsigned long flags;
spin_lock_irqsave(&imxdi->irq_lock, flags);
__raw_writel(__raw_readl(imxdi->ioaddr + DIER) | intr,
imxdi->ioaddr + DIER);
spin_unlock_irqrestore(&imxdi->irq_lock, flags);
}
static void di_int_disable(struct imxdi_dev *imxdi, u32 intr)
{
unsigned long flags;
spin_lock_irqsave(&imxdi->irq_lock, flags);
__raw_writel(__raw_readl(imxdi->ioaddr + DIER) & ~intr,
imxdi->ioaddr + DIER);
spin_unlock_irqrestore(&imxdi->irq_lock, flags);
}
static void clear_write_error(struct imxdi_dev *imxdi)
{
int cnt;
dev_warn(&imxdi->pdev->dev, "WARNING: Register write error!
");
__raw_writel(DSR_WEF, imxdi->ioaddr + DSR);
for (cnt = 0; cnt < 1000; cnt++) {
if ((__raw_readl(imxdi->ioaddr + DSR) & DSR_WEF) == 0)
return;
udelay(10);
}
dev_err(&imxdi->pdev->dev,
"ERROR: Cannot clear write-error flag!
");
}
static int di_write_wait(struct imxdi_dev *imxdi, u32 val, int reg)
{
int ret;
int rc = 0;
mutex_lock(&imxdi->write_mutex);
di_int_enable(imxdi, DIER_WCIE);
imxdi->dsr = 0;
__raw_writel(val, imxdi->ioaddr + reg);
ret = wait_event_interruptible_timeout(imxdi->write_wait,
imxdi->dsr & (DSR_WCF | DSR_WEF), msecs_to_jiffies(1));
if (ret < 0) {
rc = ret;
goto out;
} else if (ret == 0) {
dev_warn(&imxdi->pdev->dev,
"Write-wait timeout "
"val = 0x%08x reg = 0x%08x
", val, reg);
}
if (imxdi->dsr & DSR_WEF) {
clear_write_error(imxdi);
rc = -EIO;
}
out:
mutex_unlock(&imxdi->write_mutex);
return rc;
}
static int dryice_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct imxdi_dev *imxdi = dev_get_drvdata(dev);
unsigned long now;
now = __raw_readl(imxdi->ioaddr + DTCMR);
rtc_time_to_tm(now, tm);
return 0;
}
static int dryice_rtc_set_mmss(struct device *dev, unsigned long secs)
{
struct imxdi_dev *imxdi = dev_get_drvdata(dev);
int rc;
rc = di_write_wait(imxdi, 0, DTCLR);
if (rc == 0)
rc = di_write_wait(imxdi, secs, DTCMR);
return rc;
}
static int dryice_rtc_alarm_irq_enable(struct device *dev,
unsigned int enabled)
{
struct imxdi_dev *imxdi = dev_get_drvdata(dev);
if (enabled)
di_int_enable(imxdi, DIER_CAIE);
else
di_int_disable(imxdi, DIER_CAIE);
return 0;
}
static int dryice_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
struct imxdi_dev *imxdi = dev_get_drvdata(dev);
u32 dcamr;
dcamr = __raw_readl(imxdi->ioaddr + DCAMR);
rtc_time_to_tm(dcamr, &alarm->time);
alarm->enabled = (__raw_readl(imxdi->ioaddr + DIER) & DIER_CAIE) != 0;
mutex_lock(&imxdi->write_mutex);
alarm->pending = (__raw_readl(imxdi->ioaddr + DSR) & DSR_CAF) != 0;
mutex_unlock(&imxdi->write_mutex);
return 0;
}
static int dryice_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
struct imxdi_dev *imxdi = dev_get_drvdata(dev);
unsigned long now;
unsigned long alarm_time;
int rc;
rc = rtc_tm_to_time(&alarm->time, &alarm_time);
if (rc)
return rc;
now = __raw_readl(imxdi->ioaddr + DTCMR);
if (alarm_time < now)
return -EINVAL;
rc = di_write_wait(imxdi, (u32)alarm_time, DCAMR);
if (rc)
return rc;
if (alarm->enabled)
di_int_enable(imxdi, DIER_CAIE);
else
di_int_disable(imxdi, DIER_CAIE);
return 0;
}
static struct rtc_class_ops dryice_rtc_ops = {
.read_time = dryice_rtc_read_time,
.set_mmss = dryice_rtc_set_mmss,
.alarm_irq_enable = dryice_rtc_alarm_irq_enable,
.read_alarm = dryice_rtc_read_alarm,
.set_alarm = dryice_rtc_set_alarm,
};
static irqreturn_t dryice_norm_irq(int irq, void *dev_id)
{
struct imxdi_dev *imxdi = dev_id;
u32 dsr, dier;
irqreturn_t rc = IRQ_NONE;
dier = __raw_readl(imxdi->ioaddr + DIER);
if ((dier & DIER_WCIE)) {
if (list_empty_careful(&imxdi->write_wait.task_list))
return rc;
dsr = __raw_readl(imxdi->ioaddr + DSR);
if ((dsr & (DSR_WCF | DSR_WEF))) {
di_int_disable(imxdi, DIER_WCIE);
imxdi->dsr |= dsr;
wake_up_interruptible(&imxdi->write_wait);
rc = IRQ_HANDLED;
}
}
if ((dier & DIER_CAIE)) {
dsr = __raw_readl(imxdi->ioaddr + DSR);
if (dsr & DSR_CAF) {
di_int_disable(imxdi, DIER_CAIE);
schedule_work(&imxdi->work);
rc = IRQ_HANDLED;
}
}
return rc;
}
static void dryice_work(struct work_struct *work)
{
struct imxdi_dev *imxdi = container_of(work,
struct imxdi_dev, work);
di_write_wait(imxdi, DSR_CAF, DSR);
rtc_update_irq(imxdi->rtc, 1, RTC_AF | RTC_IRQF);
}
static int __init dryice_rtc_probe(struct platform_device *pdev)
{
struct resource *res;
struct imxdi_dev *imxdi;
int rc;
imxdi = devm_kzalloc(&pdev->dev, sizeof(*imxdi), GFP_KERNEL);
if (!imxdi)
return -ENOMEM;
imxdi->pdev = pdev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
imxdi->ioaddr = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(imxdi->ioaddr))
return PTR_ERR(imxdi->ioaddr);
spin_lock_init(&imxdi->irq_lock);
imxdi->irq = platform_get_irq(pdev, 0);
if (imxdi->irq < 0)
return imxdi->irq;
init_waitqueue_head(&imxdi->write_wait);
INIT_WORK(&imxdi->work, dryice_work);
mutex_init(&imxdi->write_mutex);
imxdi->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(imxdi->clk))
return PTR_ERR(imxdi->clk);
clk_prepare_enable(imxdi->clk);
__raw_writel(0, imxdi->ioaddr + DIER);
rc = devm_request_irq(&pdev->dev, imxdi->irq, dryice_norm_irq,
IRQF_SHARED, pdev->name, imxdi);
if (rc) {
dev_warn(&pdev->dev, "interrupt not available.
");
goto err;
}
if (__raw_readl(imxdi->ioaddr + DSR) & DSR_NVF) {
rc = di_write_wait(imxdi, DSR_NVF | DSR_SVF, DSR);
if (rc)
goto err;
}
rc = di_write_wait(imxdi, DCAMR_UNSET, DCAMR);
if (rc)
goto err;
rc = di_write_wait(imxdi, 0, DCALR);
if (rc)
goto err;
if (__raw_readl(imxdi->ioaddr + DSR) & DSR_CAF) {
rc = di_write_wait(imxdi, DSR_CAF, DSR);
if (rc)
goto err;
}
if (__raw_readl(imxdi->ioaddr + DTCMR) == 0) {
rc = di_write_wait(imxdi, 0, DTCMR);
if (rc)
goto err;
}
if (!(__raw_readl(imxdi->ioaddr + DCR) & DCR_TCE)) {
rc = di_write_wait(imxdi,
__raw_readl(imxdi->ioaddr + DCR) | DCR_TCE,
DCR);
if (rc)
goto err;
}
platform_set_drvdata(pdev, imxdi);
imxdi->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
&dryice_rtc_ops, THIS_MODULE);
if (IS_ERR(imxdi->rtc)) {
rc = PTR_ERR(imxdi->rtc);
goto err;
}
return 0;
err:
clk_disable_unprepare(imxdi->clk);
return rc;
}
static int __exit dryice_rtc_remove(struct platform_device *pdev)
{
struct imxdi_dev *imxdi = platform_get_drvdata(pdev);
flush_work(&imxdi->work);
__raw_writel(0, imxdi->ioaddr + DIER);
clk_disable_unprepare(imxdi->clk);
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id dryice_dt_ids[] = {
{ .compatible = "fsl,imx25-rtc" },
{ }
};
MODULE_DEVICE_TABLE(of, dryice_dt_ids);
#endif
static struct platform_driver dryice_rtc_driver = {
.driver = {
.name = "imxdi_rtc",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(dryice_dt_ids),
},
.remove = __exit_p(dryice_rtc_remove),
};
module_platform_driver_probe(dryice_rtc_driver, dryice_rtc_probe);
MODULE_AUTHOR("Freescale Semiconductor, Inc.");
MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
MODULE_DESCRIPTION("IMX DryIce Realtime Clock Driver (RTC)");
MODULE_LICENSE("GPL");
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