Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / rtc / rtc-ds1216.c

diff --git a/kernel/drivers/rtc/rtc-ds1216.c b/kernel/drivers/rtc/rtc-ds1216.c
new file mode 100644 (file)
index 0000000..d16f550
--- /dev/null
+++ b/kernel/drivers/rtc/rtc-ds1216.c
@@ -0,0 +1,182 @@
+/*
+ * Dallas DS1216 RTC driver
+ *
+ * Copyright (c) 2007 Thomas Bogendoerfer
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/rtc.h>
+#include <linux/platform_device.h>
+#include <linux/bcd.h>
+#include <linux/slab.h>
+
+#define DRV_VERSION "0.2"
+
+struct ds1216_regs {
+       u8 tsec;
+       u8 sec;
+       u8 min;
+       u8 hour;
+       u8 wday;
+       u8 mday;
+       u8 month;
+       u8 year;
+};
+
+#define DS1216_HOUR_1224       (1 << 7)
+#define DS1216_HOUR_AMPM       (1 << 5)
+
+struct ds1216_priv {
+       struct rtc_device *rtc;
+       void __iomem *ioaddr;
+};
+
+static const u8 magic[] = {
+       0xc5, 0x3a, 0xa3, 0x5c, 0xc5, 0x3a, 0xa3, 0x5c
+};
+
+/*
+ * Read the 64 bit we'd like to have - It a series
+ * of 64 bits showing up in the LSB of the base register.
+ *
+ */
+static void ds1216_read(u8 __iomem *ioaddr, u8 *buf)
+{
+       unsigned char c;
+       int i, j;
+
+       for (i = 0; i < 8; i++) {
+               c = 0;
+               for (j = 0; j < 8; j++)
+                       c |= (readb(ioaddr) & 0x1) << j;
+               buf[i] = c;
+       }
+}
+
+static void ds1216_write(u8 __iomem *ioaddr, const u8 *buf)
+{
+       unsigned char c;
+       int i, j;
+
+       for (i = 0; i < 8; i++) {
+               c = buf[i];
+               for (j = 0; j < 8; j++) {
+                       writeb(c, ioaddr);
+                       c = c >> 1;
+               }
+       }
+}
+
+static void ds1216_switch_ds_to_clock(u8 __iomem *ioaddr)
+{
+       /* Reset magic pointer */
+       readb(ioaddr);
+       /* Write 64 bit magic to DS1216 */
+       ds1216_write(ioaddr, magic);
+}
+
+static int ds1216_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+       struct platform_device *pdev = to_platform_device(dev);
+       struct ds1216_priv *priv = platform_get_drvdata(pdev);
+       struct ds1216_regs regs;
+
+       ds1216_switch_ds_to_clock(priv->ioaddr);
+       ds1216_read(priv->ioaddr, (u8 *)&regs);
+
+       tm->tm_sec = bcd2bin(regs.sec);
+       tm->tm_min = bcd2bin(regs.min);
+       if (regs.hour & DS1216_HOUR_1224) {
+               /* AM/PM mode */
+               tm->tm_hour = bcd2bin(regs.hour & 0x1f);
+               if (regs.hour & DS1216_HOUR_AMPM)
+                       tm->tm_hour += 12;
+       } else
+               tm->tm_hour = bcd2bin(regs.hour & 0x3f);
+       tm->tm_wday = (regs.wday & 7) - 1;
+       tm->tm_mday = bcd2bin(regs.mday & 0x3f);
+       tm->tm_mon = bcd2bin(regs.month & 0x1f);
+       tm->tm_year = bcd2bin(regs.year);
+       if (tm->tm_year < 70)
+               tm->tm_year += 100;
+
+       return rtc_valid_tm(tm);
+}
+
+static int ds1216_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+       struct platform_device *pdev = to_platform_device(dev);
+       struct ds1216_priv *priv = platform_get_drvdata(pdev);
+       struct ds1216_regs regs;
+
+       ds1216_switch_ds_to_clock(priv->ioaddr);
+       ds1216_read(priv->ioaddr, (u8 *)&regs);
+
+       regs.tsec = 0; /* clear 0.1 and 0.01 seconds */
+       regs.sec = bin2bcd(tm->tm_sec);
+       regs.min = bin2bcd(tm->tm_min);
+       regs.hour &= DS1216_HOUR_1224;
+       if (regs.hour && tm->tm_hour > 12) {
+               regs.hour |= DS1216_HOUR_AMPM;
+               tm->tm_hour -= 12;
+       }
+       regs.hour |= bin2bcd(tm->tm_hour);
+       regs.wday &= ~7;
+       regs.wday |= tm->tm_wday;
+       regs.mday = bin2bcd(tm->tm_mday);
+       regs.month = bin2bcd(tm->tm_mon);
+       regs.year = bin2bcd(tm->tm_year % 100);
+
+       ds1216_switch_ds_to_clock(priv->ioaddr);
+       ds1216_write(priv->ioaddr, (u8 *)&regs);
+       return 0;
+}
+
+static const struct rtc_class_ops ds1216_rtc_ops = {
+       .read_time      = ds1216_rtc_read_time,
+       .set_time       = ds1216_rtc_set_time,
+};
+
+static int __init ds1216_rtc_probe(struct platform_device *pdev)
+{
+       struct resource *res;
+       struct ds1216_priv *priv;
+       u8 dummy[8];
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       if (!res)
+               return -ENODEV;
+       priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+       if (!priv)
+               return -ENOMEM;
+
+       platform_set_drvdata(pdev, priv);
+
+       priv->ioaddr = devm_ioremap_resource(&pdev->dev, res);
+       if (IS_ERR(priv->ioaddr))
+               return PTR_ERR(priv->ioaddr);
+
+       priv->rtc = devm_rtc_device_register(&pdev->dev, "ds1216",
+                                       &ds1216_rtc_ops, THIS_MODULE);
+       if (IS_ERR(priv->rtc))
+               return PTR_ERR(priv->rtc);
+
+       /* dummy read to get clock into a known state */
+       ds1216_read(priv->ioaddr, dummy);
+       return 0;
+}
+
+static struct platform_driver ds1216_rtc_platform_driver = {
+       .driver         = {
+               .name   = "rtc-ds1216",
+       },
+};
+
+module_platform_driver_probe(ds1216_rtc_platform_driver, ds1216_rtc_probe);
+
+MODULE_AUTHOR("Thomas Bogendoerfer <tsbogend@alpha.franken.de>");
+MODULE_DESCRIPTION("DS1216 RTC driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+MODULE_ALIAS("platform:rtc-ds1216");