Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / rtc / rtc-bq4802.c

diff --git a/kernel/drivers/rtc/rtc-bq4802.c b/kernel/drivers/rtc/rtc-bq4802.c
new file mode 100644 (file)
index 0000000..bd170cb
--- /dev/null
+++ b/kernel/drivers/rtc/rtc-bq4802.c
@@ -0,0 +1,199 @@
+/* rtc-bq4802.c: TI BQ4802 RTC driver.
+ *
+ * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+#include <linux/bcd.h>
+#include <linux/slab.h>
+
+MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
+MODULE_DESCRIPTION("TI BQ4802 RTC driver");
+MODULE_LICENSE("GPL");
+
+struct bq4802 {
+       void __iomem            *regs;
+       unsigned long           ioport;
+       struct rtc_device       *rtc;
+       spinlock_t              lock;
+       struct resource         *r;
+       u8 (*read)(struct bq4802 *, int);
+       void (*write)(struct bq4802 *, int, u8);
+};
+
+static u8 bq4802_read_io(struct bq4802 *p, int off)
+{
+       return inb(p->ioport + off);
+}
+
+static void bq4802_write_io(struct bq4802 *p, int off, u8 val)
+{
+       outb(val, p->ioport + off);
+}
+
+static u8 bq4802_read_mem(struct bq4802 *p, int off)
+{
+       return readb(p->regs + off);
+}
+
+static void bq4802_write_mem(struct bq4802 *p, int off, u8 val)
+{
+       writeb(val, p->regs + off);
+}
+
+static int bq4802_read_time(struct device *dev, struct rtc_time *tm)
+{
+       struct platform_device *pdev = to_platform_device(dev);
+       struct bq4802 *p = platform_get_drvdata(pdev);
+       unsigned long flags;
+       unsigned int century;
+       u8 val;
+
+       spin_lock_irqsave(&p->lock, flags);
+
+       val = p->read(p, 0x0e);
+       p->write(p, 0xe, val | 0x08);
+
+       tm->tm_sec = p->read(p, 0x00);
+       tm->tm_min = p->read(p, 0x02);
+       tm->tm_hour = p->read(p, 0x04);
+       tm->tm_mday = p->read(p, 0x06);
+       tm->tm_mon = p->read(p, 0x09);
+       tm->tm_year = p->read(p, 0x0a);
+       tm->tm_wday = p->read(p, 0x08);
+       century = p->read(p, 0x0f);
+
+       p->write(p, 0x0e, val);
+
+       spin_unlock_irqrestore(&p->lock, flags);
+
+       tm->tm_sec = bcd2bin(tm->tm_sec);
+       tm->tm_min = bcd2bin(tm->tm_min);
+       tm->tm_hour = bcd2bin(tm->tm_hour);
+       tm->tm_mday = bcd2bin(tm->tm_mday);
+       tm->tm_mon = bcd2bin(tm->tm_mon);
+       tm->tm_year = bcd2bin(tm->tm_year);
+       tm->tm_wday = bcd2bin(tm->tm_wday);
+       century = bcd2bin(century);
+
+       tm->tm_year += (century * 100);
+       tm->tm_year -= 1900;
+
+       tm->tm_mon--;
+
+       return 0;
+}
+
+static int bq4802_set_time(struct device *dev, struct rtc_time *tm)
+{
+       struct platform_device *pdev = to_platform_device(dev);
+       struct bq4802 *p = platform_get_drvdata(pdev);
+       u8 sec, min, hrs, day, mon, yrs, century, val;
+       unsigned long flags;
+       unsigned int year;
+
+       year = tm->tm_year + 1900;
+       century = year / 100;
+       yrs = year % 100;
+
+       mon = tm->tm_mon + 1;   /* tm_mon starts at zero */
+       day = tm->tm_mday;
+       hrs = tm->tm_hour;
+       min = tm->tm_min;
+       sec = tm->tm_sec;
+
+       sec = bin2bcd(sec);
+       min = bin2bcd(min);
+       hrs = bin2bcd(hrs);
+       day = bin2bcd(day);
+       mon = bin2bcd(mon);
+       yrs = bin2bcd(yrs);
+       century = bin2bcd(century);
+
+       spin_lock_irqsave(&p->lock, flags);
+
+       val = p->read(p, 0x0e);
+       p->write(p, 0x0e, val | 0x08);
+
+       p->write(p, 0x00, sec);
+       p->write(p, 0x02, min);
+       p->write(p, 0x04, hrs);
+       p->write(p, 0x06, day);
+       p->write(p, 0x09, mon);
+       p->write(p, 0x0a, yrs);
+       p->write(p, 0x0f, century);
+
+       p->write(p, 0x0e, val);
+
+       spin_unlock_irqrestore(&p->lock, flags);
+
+       return 0;
+}
+
+static const struct rtc_class_ops bq4802_ops = {
+       .read_time      = bq4802_read_time,
+       .set_time       = bq4802_set_time,
+};
+
+static int bq4802_probe(struct platform_device *pdev)
+{
+       struct bq4802 *p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);
+       int err = -ENOMEM;
+
+       if (!p)
+               goto out;
+
+       spin_lock_init(&p->lock);
+
+       p->r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       if (!p->r) {
+               p->r = platform_get_resource(pdev, IORESOURCE_IO, 0);
+               err = -EINVAL;
+               if (!p->r)
+                       goto out;
+       }
+       if (p->r->flags & IORESOURCE_IO) {
+               p->ioport = p->r->start;
+               p->read = bq4802_read_io;
+               p->write = bq4802_write_io;
+       } else if (p->r->flags & IORESOURCE_MEM) {
+               p->regs = devm_ioremap(&pdev->dev, p->r->start,
+                                       resource_size(p->r));
+               p->read = bq4802_read_mem;
+               p->write = bq4802_write_mem;
+       } else {
+               err = -EINVAL;
+               goto out;
+       }
+
+       platform_set_drvdata(pdev, p);
+
+       p->rtc = devm_rtc_device_register(&pdev->dev, "bq4802",
+                                       &bq4802_ops, THIS_MODULE);
+       if (IS_ERR(p->rtc)) {
+               err = PTR_ERR(p->rtc);
+               goto out;
+       }
+
+       err = 0;
+out:
+       return err;
+
+}
+
+/* work with hotplug and coldplug */
+MODULE_ALIAS("platform:rtc-bq4802");
+
+static struct platform_driver bq4802_driver = {
+       .driver         = {
+               .name   = "rtc-bq4802",
+       },
+       .probe          = bq4802_probe,
+};
+
+module_platform_driver(bq4802_driver);