ARM: at91: make rm9200 rtc drivers soc independent

switch the rtc drivers to resource and pass it via platform_device

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>

1 files changed, 63 insertions, 38 deletions

diff --git a/drivers/rtc/rtc-at91rm9200.c b/drivers/rtc/rtc-at91rm9200.c
index e39b77a4609a..dc474bc6522d 100644
--- a/drivers/rtc/rtc-at91rm9200.c
+++ b/drivers/rtc/rtc-at91rm9200.c
@@ -32,11 +32,17 @@
 
 #include <mach/at91_rtc.h>
 
+#define at91_rtc_read(field) \
+        __raw_readl(at91_rtc_regs + field)
+#define at91_rtc_write(field, val) \
+        __raw_writel((val), at91_rtc_regs + field)
 
 #define AT91_RTC_EPOCH          1900UL  /* just like arch/arm/common/rtctime.c */
 
 static DECLARE_COMPLETION(at91_rtc_updated);
 static unsigned int at91_alarm_year = AT91_RTC_EPOCH;
+static void __iomem *at91_rtc_regs;
+static int irq;
 
 /*
  * Decode time/date into rtc_time structure
@@ -48,10 +54,10 @@ static void at91_rtc_decodetime(unsigned int timereg, unsigned int calreg,
 
         /* must read twice in case it changes */
         do {
-                time = at91_sys_read(timereg);
-                date = at91_sys_read(calreg);
-        } while ((time != at91_sys_read(timereg)) ||
-                        (date != at91_sys_read(calreg)));
+                time = at91_rtc_read(timereg);
+                date = at91_rtc_read(calreg);
+        } while ((time != at91_rtc_read(timereg)) ||
+                        (date != at91_rtc_read(calreg)));
 
         tm->tm_sec  = bcd2bin((time & AT91_RTC_SEC) >> 0);
         tm->tm_min  = bcd2bin((time & AT91_RTC_MIN) >> 8);
@@ -98,19 +104,19 @@ static int at91_rtc_settime(struct device *dev, struct rtc_time *tm)
                 tm->tm_hour, tm->tm_min, tm->tm_sec);
 
         /* Stop Time/Calendar from counting */
-        cr = at91_sys_read(AT91_RTC_CR);
-        at91_sys_write(AT91_RTC_CR, cr | AT91_RTC_UPDCAL | AT91_RTC_UPDTIM);
+        cr = at91_rtc_read(AT91_RTC_CR);
+        at91_rtc_write(AT91_RTC_CR, cr | AT91_RTC_UPDCAL | AT91_RTC_UPDTIM);
 
-        at91_sys_write(AT91_RTC_IER, AT91_RTC_ACKUPD);
+        at91_rtc_write(AT91_RTC_IER, AT91_RTC_ACKUPD);
         wait_for_completion(&at91_rtc_updated); /* wait for ACKUPD interrupt */
-        at91_sys_write(AT91_RTC_IDR, AT91_RTC_ACKUPD);
+        at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD);
 
-        at91_sys_write(AT91_RTC_TIMR,
+        at91_rtc_write(AT91_RTC_TIMR,
                           bin2bcd(tm->tm_sec) << 0
                         | bin2bcd(tm->tm_min) << 8
                         | bin2bcd(tm->tm_hour) << 16);
 
-        at91_sys_write(AT91_RTC_CALR,
+        at91_rtc_write(AT91_RTC_CALR,
                           bin2bcd((tm->tm_year + 1900) / 100)   /* century */
                         | bin2bcd(tm->tm_year % 100) << 8       /* year */
                         | bin2bcd(tm->tm_mon + 1) << 16         /* tm_mon starts at zero */
@@ -118,8 +124,8 @@ static int at91_rtc_settime(struct device *dev, struct rtc_time *tm)
                         | bin2bcd(tm->tm_mday) << 24);
 
         /* Restart Time/Calendar */
-        cr = at91_sys_read(AT91_RTC_CR);
-        at91_sys_write(AT91_RTC_CR, cr & ~(AT91_RTC_UPDCAL | AT91_RTC_UPDTIM));
+        cr = at91_rtc_read(AT91_RTC_CR);
+        at91_rtc_write(AT91_RTC_CR, cr & ~(AT91_RTC_UPDCAL | AT91_RTC_UPDTIM));
 
         return 0;
 }
@@ -135,7 +141,7 @@ static int at91_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
         tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
         tm->tm_year = at91_alarm_year - 1900;
 
-        alrm->enabled = (at91_sys_read(AT91_RTC_IMR) & AT91_RTC_ALARM)
+        alrm->enabled = (at91_rtc_read(AT91_RTC_IMR) & AT91_RTC_ALARM)
                         ? 1 : 0;
 
         pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
@@ -160,20 +166,20 @@ static int at91_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
         tm.tm_min = alrm->time.tm_min;
         tm.tm_sec = alrm->time.tm_sec;
 
-        at91_sys_write(AT91_RTC_IDR, AT91_RTC_ALARM);
-        at91_sys_write(AT91_RTC_TIMALR,
+        at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ALARM);
+        at91_rtc_write(AT91_RTC_TIMALR,
                   bin2bcd(tm.tm_sec) << 0
                 | bin2bcd(tm.tm_min) << 8
                 | bin2bcd(tm.tm_hour) << 16
                 | AT91_RTC_HOUREN | AT91_RTC_MINEN | AT91_RTC_SECEN);
-        at91_sys_write(AT91_RTC_CALALR,
+        at91_rtc_write(AT91_RTC_CALALR,
                   bin2bcd(tm.tm_mon + 1) << 16          /* tm_mon starts at zero */
                 | bin2bcd(tm.tm_mday) << 24
                 | AT91_RTC_DATEEN | AT91_RTC_MTHEN);
 
         if (alrm->enabled) {
-                at91_sys_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
-                at91_sys_write(AT91_RTC_IER, AT91_RTC_ALARM);
+                at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
+                at91_rtc_write(AT91_RTC_IER, AT91_RTC_ALARM);
         }
 
         pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
@@ -188,10 +194,10 @@ static int at91_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
         pr_debug("%s(): cmd=%08x\n", __func__, enabled);
 
         if (enabled) {
-                at91_sys_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
-                at91_sys_write(AT91_RTC_IER, AT91_RTC_ALARM);
+                at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
+                at91_rtc_write(AT91_RTC_IER, AT91_RTC_ALARM);
         } else
-                at91_sys_write(AT91_RTC_IDR, AT91_RTC_ALARM);
+                at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ALARM);
 
         return 0;
 }
@@ -200,7 +206,7 @@ static int at91_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
  */
 static int at91_rtc_proc(struct device *dev, struct seq_file *seq)
 {
-        unsigned long imr = at91_sys_read(AT91_RTC_IMR);
+        unsigned long imr = at91_rtc_read(AT91_RTC_IMR);
 
         seq_printf(seq, "update_IRQ\t: %s\n",
                         (imr & AT91_RTC_ACKUPD) ? "yes" : "no");
@@ -220,7 +226,7 @@ static irqreturn_t at91_rtc_interrupt(int irq, void *dev_id)
         unsigned int rtsr;
         unsigned long events = 0;
 
-        rtsr = at91_sys_read(AT91_RTC_SR) & at91_sys_read(AT91_RTC_IMR);
+        rtsr = at91_rtc_read(AT91_RTC_SR) & at91_rtc_read(AT91_RTC_IMR);
         if (rtsr) {             /* this interrupt is shared!  Is it ours? */
                 if (rtsr & AT91_RTC_ALARM)
                         events |= (RTC_AF | RTC_IRQF);
@@ -229,7 +235,7 @@ static irqreturn_t at91_rtc_interrupt(int irq, void *dev_id)
                 if (rtsr & AT91_RTC_ACKUPD)
                         complete(&at91_rtc_updated);
 
-                at91_sys_write(AT91_RTC_SCCR, rtsr);    /* clear status reg */
+                at91_rtc_write(AT91_RTC_SCCR, rtsr);    /* clear status reg */
 
                 rtc_update_irq(rtc, 1, events);
 
@@ -256,22 +262,41 @@ static const struct rtc_class_ops at91_rtc_ops = {
 static int __init at91_rtc_probe(struct platform_device *pdev)
 {
         struct rtc_device *rtc;
-        int ret;
+        struct resource *regs;
+        int ret = 0;
 
-        at91_sys_write(AT91_RTC_CR, 0);
-        at91_sys_write(AT91_RTC_MR, 0);         /* 24 hour mode */
+        regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!regs) {
+                dev_err(&pdev->dev, "no mmio resource defined\n");
+                return -ENXIO;
+        }
+
+        irq = platform_get_irq(pdev, 0);
+        if (irq < 0) {
+                dev_err(&pdev->dev, "no irq resource defined\n");
+                return -ENXIO;
+        }
+
+        at91_rtc_regs = ioremap(regs->start, resource_size(regs));
+        if (!at91_rtc_regs) {
+                dev_err(&pdev->dev, "failed to map registers, aborting.\n");
+                return -ENOMEM;
+        }
+
+        at91_rtc_write(AT91_RTC_CR, 0);
+        at91_rtc_write(AT91_RTC_MR, 0);         /* 24 hour mode */
 
         /* Disable all interrupts */
-        at91_sys_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM |
+        at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM |
                                         AT91_RTC_SECEV | AT91_RTC_TIMEV |
                                         AT91_RTC_CALEV);
 
-        ret = request_irq(AT91_ID_SYS, at91_rtc_interrupt,
+        ret = request_irq(irq, at91_rtc_interrupt,
                                 IRQF_SHARED,
                                 "at91_rtc", pdev);
         if (ret) {
                 printk(KERN_ERR "at91_rtc: IRQ %d already in use.\n",
-                                AT91_ID_SYS);
+                                irq);
                 return ret;
         }
 
@@ -284,7 +309,7 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
         rtc = rtc_device_register(pdev->name, &pdev->dev,
                                 &at91_rtc_ops, THIS_MODULE);
         if (IS_ERR(rtc)) {
-                free_irq(AT91_ID_SYS, pdev);
+                free_irq(irq, pdev);
                 return PTR_ERR(rtc);
         }
         platform_set_drvdata(pdev, rtc);
@@ -301,10 +326,10 @@ static int __exit at91_rtc_remove(struct platform_device *pdev)
         struct rtc_device *rtc = platform_get_drvdata(pdev);
 
         /* Disable all interrupts */
-        at91_sys_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM |
+        at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM |
                                         AT91_RTC_SECEV | AT91_RTC_TIMEV |
                                         AT91_RTC_CALEV);
-        free_irq(AT91_ID_SYS, pdev);
+        free_irq(irq, pdev);
 
         rtc_device_unregister(rtc);
         platform_set_drvdata(pdev, NULL);
@@ -323,13 +348,13 @@ static int at91_rtc_suspend(struct device *dev)
         /* this IRQ is shared with DBGU and other hardware which isn't
          * necessarily doing PM like we are...
          */
-        at91_rtc_imr = at91_sys_read(AT91_RTC_IMR)
+        at91_rtc_imr = at91_rtc_read(AT91_RTC_IMR)
                         & (AT91_RTC_ALARM|AT91_RTC_SECEV);
         if (at91_rtc_imr) {
                 if (device_may_wakeup(dev))
-                        enable_irq_wake(AT91_ID_SYS);
+                        enable_irq_wake(irq);
                 else
-                        at91_sys_write(AT91_RTC_IDR, at91_rtc_imr);
+                        at91_rtc_write(AT91_RTC_IDR, at91_rtc_imr);
         }
         return 0;
 }
@@ -338,9 +363,9 @@ static int at91_rtc_resume(struct device *dev)
 {
         if (at91_rtc_imr) {
                 if (device_may_wakeup(dev))
-                        disable_irq_wake(AT91_ID_SYS);
+                        disable_irq_wake(irq);
                 else
-                        at91_sys_write(AT91_RTC_IER, at91_rtc_imr);
+                        at91_rtc_write(AT91_RTC_IER, at91_rtc_imr);
         }
         return 0;
 }