Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / rtc / rtc-pl030.c

diff --git a/kernel/drivers/rtc/rtc-pl030.c b/kernel/drivers/rtc/rtc-pl030.c
new file mode 100644 (file)
index 0000000..f85a1a9
--- /dev/null
+++ b/kernel/drivers/rtc/rtc-pl030.c
@@ -0,0 +1,187 @@
+/*
+ *  linux/drivers/rtc/rtc-pl030.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/rtc.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/amba/bus.h>
+#include <linux/io.h>
+#include <linux/slab.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)
+
+struct pl030_rtc {
+       struct rtc_device       *rtc;
+       void __iomem            *base;
+};
+
+static irqreturn_t pl030_interrupt(int irq, void *dev_id)
+{
+       struct pl030_rtc *rtc = dev_id;
+       writel(0, rtc->base + RTC_EOI);
+       return IRQ_HANDLED;
+}
+
+static int pl030_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+       struct pl030_rtc *rtc = dev_get_drvdata(dev);
+
+       rtc_time_to_tm(readl(rtc->base + RTC_MR), &alrm->time);
+       return 0;
+}
+
+static int pl030_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+       struct pl030_rtc *rtc = dev_get_drvdata(dev);
+       unsigned long time;
+       int ret;
+
+       /*
+        * At the moment, we can only deal with non-wildcarded alarm times.
+        */
+       ret = rtc_valid_tm(&alrm->time);
+       if (ret == 0)
+               ret = rtc_tm_to_time(&alrm->time, &time);
+       if (ret == 0)
+               writel(time, rtc->base + RTC_MR);
+       return ret;
+}
+
+static int pl030_read_time(struct device *dev, struct rtc_time *tm)
+{
+       struct pl030_rtc *rtc = dev_get_drvdata(dev);
+
+       rtc_time_to_tm(readl(rtc->base + RTC_DR), tm);
+
+       return 0;
+}
+
+/*
+ * 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 pl030_set_time(struct device *dev, struct rtc_time *tm)
+{
+       struct pl030_rtc *rtc = dev_get_drvdata(dev);
+       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 const struct rtc_class_ops pl030_ops = {
+       .read_time      = pl030_read_time,
+       .set_time       = pl030_set_time,
+       .read_alarm     = pl030_read_alarm,
+       .set_alarm      = pl030_set_alarm,
+};
+
+static int pl030_probe(struct amba_device *dev, const struct amba_id *id)
+{
+       struct pl030_rtc *rtc;
+       int ret;
+
+       ret = amba_request_regions(dev, NULL);
+       if (ret)
+               goto err_req;
+
+       rtc = devm_kzalloc(&dev->dev, sizeof(*rtc), GFP_KERNEL);
+       if (!rtc) {
+               ret = -ENOMEM;
+               goto err_rtc;
+       }
+
+       rtc->base = ioremap(dev->res.start, resource_size(&dev->res));
+       if (!rtc->base) {
+               ret = -ENOMEM;
+               goto err_rtc;
+       }
+
+       __raw_writel(0, rtc->base + RTC_CR);
+       __raw_writel(0, rtc->base + RTC_EOI);
+
+       amba_set_drvdata(dev, rtc);
+
+       ret = request_irq(dev->irq[0], pl030_interrupt, 0,
+                         "rtc-pl030", rtc);
+       if (ret)
+               goto err_irq;
+
+       rtc->rtc = rtc_device_register("pl030", &dev->dev, &pl030_ops,
+                                      THIS_MODULE);
+       if (IS_ERR(rtc->rtc)) {
+               ret = PTR_ERR(rtc->rtc);
+               goto err_reg;
+       }
+
+       return 0;
+
+ err_reg:
+       free_irq(dev->irq[0], rtc);
+ err_irq:
+       iounmap(rtc->base);
+ err_rtc:
+       amba_release_regions(dev);
+ err_req:
+       return ret;
+}
+
+static int pl030_remove(struct amba_device *dev)
+{
+       struct pl030_rtc *rtc = amba_get_drvdata(dev);
+
+       writel(0, rtc->base + RTC_CR);
+
+       free_irq(dev->irq[0], rtc);
+       rtc_device_unregister(rtc->rtc);
+       iounmap(rtc->base);
+       amba_release_regions(dev);
+
+       return 0;
+}
+
+static struct amba_id pl030_ids[] = {
+       {
+               .id     = 0x00041030,
+               .mask   = 0x000fffff,
+       },
+       { 0, 0 },
+};
+
+MODULE_DEVICE_TABLE(amba, pl030_ids);
+
+static struct amba_driver pl030_driver = {
+       .drv            = {
+               .name   = "rtc-pl030",
+       },
+       .probe          = pl030_probe,
+       .remove         = pl030_remove,
+       .id_table       = pl030_ids,
+};
+
+module_amba_driver(pl030_driver);
+
+MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
+MODULE_DESCRIPTION("ARM AMBA PL030 RTC Driver");
+MODULE_LICENSE("GPL");