1 files changed, 313 insertions, 0 deletions

diff --git a/arch/cris/arch-v10/drivers/pcf8563.c b/arch/cris/arch-v10/drivers/pcf8563.c
new file mode 100644
index 000000000000..b3dfdf7b8fc5
--- /dev/null
+++ b/arch/cris/arch-v10/drivers/pcf8563.c
@@ -0,0 +1,313 @@
+/*
+ * PCF8563 RTC
+ *
+ * From Phillips' datasheet:
+ *
+ * The PCF8563 is a CMOS real-time clock/calendar optimized for low power
+ * consumption. A programmable clock output, interupt output and voltage
+ * low detector are also provided. All address and data are transferred
+ * serially via two-line bidirectional I2C-bus. Maximum bus speed is
+ * 400 kbits/s. The built-in word address register is incremented
+ * automatically after each written or read bute.
+ *
+ * Copyright (c) 2002, Axis Communications AB
+ * All rights reserved.
+ *
+ * Author: Tobias Anderberg <tobiasa@axis.com>.
+ *
+ * $Id: pcf8563.c,v 1.8 2004/08/24 06:42:51 starvik Exp $
+ */
+
+#include <linux/config.h>
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/ioctl.h>
+#include <linux/delay.h>
+#include <linux/bcd.h>
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/arch/svinto.h>
+#include <asm/rtc.h>
+#include "i2c.h"
+
+#define PCF8563_MAJOR 121               /* Local major number. */
+#define DEVICE_NAME "rtc"               /* Name which is registered in /proc/devices. */
+#define PCF8563_NAME "PCF8563"
+#define DRIVER_VERSION "$Revision: 1.8 $"
+
+/* I2C bus slave registers. */
+#define RTC_I2C_READ            0xa3
+#define RTC_I2C_WRITE           0xa2
+
+/* Two simple wrapper macros, saves a few keystrokes. */
+#define rtc_read(x) i2c_readreg(RTC_I2C_READ, x)
+#define rtc_write(x,y) i2c_writereg(RTC_I2C_WRITE, x, y)
+        
+static const unsigned char days_in_month[] =
+        { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
+
+int pcf8563_ioctl(struct inode *, struct file *, unsigned int, unsigned long);
+
+static struct file_operations pcf8563_fops = {
+        .owner = THIS_MODULE,
+        .ioctl = pcf8563_ioctl,
+};
+
+unsigned char
+pcf8563_readreg(int reg) 
+{
+        unsigned char res = i2c_readreg(RTC_I2C_READ, reg);
+
+        /* The PCF8563 does not return 0 for unimplemented bits */
+        switch(reg)
+        {
+                case RTC_SECONDS:
+                case RTC_MINUTES:
+                     res &= 0x7f;
+                     break;
+                case RTC_HOURS:
+                case RTC_DAY_OF_MONTH:
+                     res &= 0x3f;
+                     break;
+                case RTC_MONTH:
+                     res = (res & 0x1f) - 1;  /* PCF8563 returns month in range 1-12 */
+                     break;
+        }
+        return res;
+}
+
+void
+pcf8563_writereg(int reg, unsigned char val) 
+{
+#ifdef CONFIG_ETRAX_RTC_READONLY
+        if (reg == RTC_CONTROL1 || (reg >= RTC_SECONDS && reg <= RTC_YEAR))
+                return;
+#endif
+
+        rtc_write(reg, val);
+}
+
+void
+get_rtc_time(struct rtc_time *tm)
+{
+        tm->tm_sec = rtc_read(RTC_SECONDS);
+        tm->tm_min = rtc_read(RTC_MINUTES);
+        tm->tm_hour = rtc_read(RTC_HOURS);
+        tm->tm_mday = rtc_read(RTC_DAY_OF_MONTH);
+        tm->tm_mon = rtc_read(RTC_MONTH);
+        tm->tm_year = rtc_read(RTC_YEAR);
+
+        if (tm->tm_sec & 0x80)
+                printk(KERN_WARNING "%s: RTC Low Voltage - date/time is not reliable!\n", PCF8563_NAME);
+
+        tm->tm_year = BCD_TO_BIN(tm->tm_year) + ((tm->tm_mon & 0x80) ? 100 : 0);
+        tm->tm_sec &= 0x7f;
+        tm->tm_min &= 0x7f;
+        tm->tm_hour &= 0x3f;
+        tm->tm_mday &= 0x3f;
+        tm->tm_mon &= 0x1f;
+
+        BCD_TO_BIN(tm->tm_sec);
+        BCD_TO_BIN(tm->tm_min);
+        BCD_TO_BIN(tm->tm_hour);
+        BCD_TO_BIN(tm->tm_mday);
+        BCD_TO_BIN(tm->tm_mon);
+        tm->tm_mon--; /* Month is 1..12 in RTC but 0..11 in linux */
+}
+
+int __init
+pcf8563_init(void)
+{
+        unsigned char ret;
+
+        i2c_init();
+
+        /*
+         * First of all we need to reset the chip. This is done by
+         * clearing control1, control2 and clk freq, clear the 
+         * Voltage Low bit, and resetting all alarms.
+         */
+        if (rtc_write(RTC_CONTROL1, 0x00) < 0)
+                goto err;
+
+        if (rtc_write(RTC_CONTROL2, 0x00) < 0)
+                goto err;
+
+        if (rtc_write(RTC_CLOCKOUT_FREQ, 0x00) < 0)
+                goto err;
+
+        /* Clear the VL bit in the seconds register. */
+        ret = rtc_read(RTC_SECONDS);
+        
+        if (rtc_write(RTC_SECONDS, (ret & 0x7f)) < 0)
+                goto err;
+                
+        /* Reset the alarms. */
+        if (rtc_write(RTC_MINUTE_ALARM, 0x00) < 0)
+                goto err;
+        
+        if (rtc_write(RTC_HOUR_ALARM, 0x00) < 0)
+                goto err;
+        
+        if (rtc_write(RTC_DAY_ALARM, 0x00) < 0)
+                goto err;
+        
+        if (rtc_write(RTC_WEEKDAY_ALARM, 0x00) < 0)
+                goto err;
+        
+        /* Check for low voltage, and warn about it.. */
+        if (rtc_read(RTC_SECONDS) & 0x80)
+                printk(KERN_WARNING "%s: RTC Low Voltage - date/time is not reliable!\n", PCF8563_NAME);
+        
+        return 0;
+
+err:
+        printk(KERN_INFO "%s: Error initializing chip.\n", PCF8563_NAME);
+        return -1;
+}
+
+void __exit
+pcf8563_exit(void)
+{
+        if (unregister_chrdev(PCF8563_MAJOR, DEVICE_NAME) < 0) {
+                printk(KERN_INFO "%s: Unable to unregister device.\n", PCF8563_NAME);
+        }
+}
+
+/*
+ * ioctl calls for this driver. Why return -ENOTTY upon error? Because
+ * POSIX says so!
+ */
+int
+pcf8563_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg)
+{
+        /* Some sanity checks. */
+        if (_IOC_TYPE(cmd) != RTC_MAGIC)
+                return -ENOTTY;
+
+        if (_IOC_NR(cmd) > RTC_MAX_IOCTL)
+                return -ENOTTY;
+
+        switch (cmd) {
+                case RTC_RD_TIME:
+                        {
+                                struct rtc_time tm;
+
+                                get_rtc_time(&tm);
+
+                                if (copy_to_user((struct rtc_time *) arg, &tm, sizeof(struct rtc_time))) {
+                                        return -EFAULT;
+                                }
+
+                                return 0;
+                        }
+                        break;
+                case RTC_SET_TIME:
+                        {
+#ifdef CONFIG_ETRAX_RTC_READONLY
+                                return -EPERM;
+#else
+                                int leap;
+                                int century;
+                                struct rtc_time tm;
+
+                                memset(&tm, 0, sizeof (struct rtc_time));
+                                if (!capable(CAP_SYS_TIME))
+                                        return -EPERM;
+
+                                if (copy_from_user(&tm, (struct rtc_time *) arg, sizeof(struct rtc_time)))
+                                        return -EFAULT;
+
+                                /* Convert from struct tm to struct rtc_time. */
+                                tm.tm_year += 1900;
+                                tm.tm_mon += 1;
+                                
+                                leap = ((tm.tm_mon == 2) && ((tm.tm_year % 4) == 0)) ? 1 : 0;
+
+                                /* Perform some sanity checks. */
+                                if ((tm.tm_year < 1970) ||
+                                    (tm.tm_mon > 12) ||
+                                    (tm.tm_mday == 0) ||
+                                    (tm.tm_mday > days_in_month[tm.tm_mon] + leap) ||
+                                    (tm.tm_hour >= 24) ||
+                                    (tm.tm_min >= 60) ||
+                                    (tm.tm_sec >= 60))
+                                        return -EINVAL;
+
+                                century = (tm.tm_year >= 2000) ? 0x80 : 0;
+                                tm.tm_year = tm.tm_year % 100;
+
+                                BIN_TO_BCD(tm.tm_year);
+                                BIN_TO_BCD(tm.tm_mday);
+                                BIN_TO_BCD(tm.tm_hour);
+                                BIN_TO_BCD(tm.tm_min);
+                                BIN_TO_BCD(tm.tm_sec);
+                                tm.tm_mon |= century;
+                                
+                                rtc_write(RTC_YEAR, tm.tm_year);
+                                rtc_write(RTC_MONTH, tm.tm_mon);
+                                rtc_write(RTC_DAY_OF_MONTH, tm.tm_mday);
+                                rtc_write(RTC_HOURS, tm.tm_hour);
+                                rtc_write(RTC_MINUTES, tm.tm_min);
+                                rtc_write(RTC_SECONDS, tm.tm_sec);
+
+                                return 0;
+#endif /* !CONFIG_ETRAX_RTC_READONLY */
+                        }
+
+                case RTC_VLOW_RD:
+                {
+                        int vl_bit = 0;
+
+                        if (rtc_read(RTC_SECONDS) & 0x80) {
+                                vl_bit = 1;
+                                printk(KERN_WARNING "%s: RTC Voltage Low - reliable "
+                                       "date/time information is no longer guaranteed!\n",
+                                       PCF8563_NAME);
+                        }
+                        if (copy_to_user((int *) arg, &vl_bit, sizeof(int)))
+                                return -EFAULT;
+
+                        return 0;
+                }
+
+                case RTC_VLOW_SET:
+                {
+                        /* Clear the VL bit in the seconds register */
+                        int ret = rtc_read(RTC_SECONDS);
+
+                        rtc_write(RTC_SECONDS, (ret & 0x7F));
+
+                        return 0;
+                }
+
+                default:
+                                return -ENOTTY;
+        }
+
+        return 0;
+}
+
+static int __init
+pcf8563_register(void)
+{
+        pcf8563_init();
+        if (register_chrdev(PCF8563_MAJOR, DEVICE_NAME, &pcf8563_fops) < 0) {
+                printk(KERN_INFO "%s: Unable to get major numer %d for RTC device.\n",
+                       PCF8563_NAME, PCF8563_MAJOR);
+                return -1;
+        }
+
+        printk(KERN_INFO "%s Real-Time Clock Driver, %s\n", PCF8563_NAME, DRIVER_VERSION);
+        return 0;
+}
+
+module_init(pcf8563_register);
+module_exit(pcf8563_exit);