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-rw-r--r--arch/arm/mach-integrator/time.c213
1 files changed, 213 insertions, 0 deletions
diff --git a/arch/arm/mach-integrator/time.c b/arch/arm/mach-integrator/time.c
new file mode 100644
index 000000000000..20729de2af28
--- /dev/null
+++ b/arch/arm/mach-integrator/time.c
@@ -0,0 +1,213 @@
+/*
+ * linux/arch/arm/mach-integrator/time.c
+ *
+ * Copyright (C) 2000-2001 Deep Blue Solutions Ltd.
+ *
+ * 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/module.h>
+#include <linux/kernel.h>
+#include <linux/time.h>
+#include <linux/mc146818rtc.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/device.h>
+
+#include <asm/hardware/amba.h>
+#include <asm/hardware.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/rtc.h>
+
+#include <asm/mach/time.h>
+
+#define RTC_DR (0)
+#define RTC_MR (4)
+#define RTC_STAT (8)
+#define RTC_EOI (8)
+#define RTC_LR (12)
+#define RTC_CR (16)
+#define RTC_CR_MIE (1 << 0)
+
+extern int (*set_rtc)(void);
+static void __iomem *rtc_base;
+
+static int integrator_set_rtc(void)
+{
+ __raw_writel(xtime.tv_sec, rtc_base + RTC_LR);
+ return 1;
+}
+
+static void rtc_read_alarm(struct rtc_wkalrm *alrm)
+{
+ rtc_time_to_tm(readl(rtc_base + RTC_MR), &alrm->time);
+}
+
+static int rtc_set_alarm(struct rtc_wkalrm *alrm)
+{
+ unsigned long time;
+ int ret;
+
+ ret = rtc_tm_to_time(&alrm->time, &time);
+ if (ret == 0)
+ writel(time, rtc_base + RTC_MR);
+ return ret;
+}
+
+static void rtc_read_time(struct rtc_time *tm)
+{
+ rtc_time_to_tm(readl(rtc_base + RTC_DR), tm);
+}
+
+/*
+ * Set the RTC time. Unfortunately, we can't accurately set
+ * the point at which the counter updates.
+ *
+ * Also, since RTC_LR is transferred to RTC_CR on next rising
+ * edge of the 1Hz clock, we must write the time one second
+ * in advance.
+ */
+static int rtc_set_time(struct rtc_time *tm)
+{
+ unsigned long time;
+ int ret;
+
+ ret = rtc_tm_to_time(tm, &time);
+ if (ret == 0)
+ writel(time + 1, rtc_base + RTC_LR);
+
+ return ret;
+}
+
+static struct rtc_ops rtc_ops = {
+ .owner = THIS_MODULE,
+ .read_time = rtc_read_time,
+ .set_time = rtc_set_time,
+ .read_alarm = rtc_read_alarm,
+ .set_alarm = rtc_set_alarm,
+};
+
+static irqreturn_t rtc_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+ writel(0, rtc_base + RTC_EOI);
+ return IRQ_HANDLED;
+}
+
+static int rtc_probe(struct amba_device *dev, void *id)
+{
+ int ret;
+
+ if (rtc_base)
+ return -EBUSY;
+
+ ret = amba_request_regions(dev, NULL);
+ if (ret)
+ goto out;
+
+ rtc_base = ioremap(dev->res.start, SZ_4K);
+ if (!rtc_base) {
+ ret = -ENOMEM;
+ goto res_out;
+ }
+
+ __raw_writel(0, rtc_base + RTC_CR);
+ __raw_writel(0, rtc_base + RTC_EOI);
+
+ xtime.tv_sec = __raw_readl(rtc_base + RTC_DR);
+
+ ret = request_irq(dev->irq[0], rtc_interrupt, SA_INTERRUPT,
+ "rtc-pl030", dev);
+ if (ret)
+ goto map_out;
+
+ ret = register_rtc(&rtc_ops);
+ if (ret)
+ goto irq_out;
+
+ set_rtc = integrator_set_rtc;
+ return 0;
+
+ irq_out:
+ free_irq(dev->irq[0], dev);
+ map_out:
+ iounmap(rtc_base);
+ rtc_base = NULL;
+ res_out:
+ amba_release_regions(dev);
+ out:
+ return ret;
+}
+
+static int rtc_remove(struct amba_device *dev)
+{
+ set_rtc = NULL;
+
+ writel(0, rtc_base + RTC_CR);
+
+ free_irq(dev->irq[0], dev);
+ unregister_rtc(&rtc_ops);
+
+ iounmap(rtc_base);
+ rtc_base = NULL;
+ amba_release_regions(dev);
+
+ return 0;
+}
+
+static struct timespec rtc_delta;
+
+static int rtc_suspend(struct amba_device *dev, pm_message_t state)
+{
+ struct timespec rtc;
+
+ rtc.tv_sec = readl(rtc_base + RTC_DR);
+ rtc.tv_nsec = 0;
+ save_time_delta(&rtc_delta, &rtc);
+
+ return 0;
+}
+
+static int rtc_resume(struct amba_device *dev)
+{
+ struct timespec rtc;
+
+ rtc.tv_sec = readl(rtc_base + RTC_DR);
+ rtc.tv_nsec = 0;
+ restore_time_delta(&rtc_delta, &rtc);
+
+ return 0;
+}
+
+static struct amba_id rtc_ids[] = {
+ {
+ .id = 0x00041030,
+ .mask = 0x000fffff,
+ },
+ { 0, 0 },
+};
+
+static struct amba_driver rtc_driver = {
+ .drv = {
+ .name = "rtc-pl030",
+ },
+ .probe = rtc_probe,
+ .remove = rtc_remove,
+ .suspend = rtc_suspend,
+ .resume = rtc_resume,
+ .id_table = rtc_ids,
+};
+
+static int __init integrator_rtc_init(void)
+{
+ return amba_driver_register(&rtc_driver);
+}
+
+static void __exit integrator_rtc_exit(void)
+{
+ amba_driver_unregister(&rtc_driver);
+}
+
+module_init(integrator_rtc_init);
+module_exit(integrator_rtc_exit);