Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 515 insertions, 0 deletions

diff --git a/arch/cris/arch-v10/drivers/ds1302.c b/arch/cris/arch-v10/drivers/ds1302.c
new file mode 100644
index 00000000..74f99c68
--- /dev/null
+++ b/arch/cris/arch-v10/drivers/ds1302.c
@@ -0,0 +1,515 @@
+/*!***************************************************************************
+*!
+*! FILE NAME  : ds1302.c
+*!
+*! DESCRIPTION: Implements an interface for the DS1302 RTC through Etrax I/O
+*!
+*! Functions exported: ds1302_readreg, ds1302_writereg, ds1302_init
+*!
+*! ---------------------------------------------------------------------------
+*!
+*! (C) Copyright 1999-2007 Axis Communications AB, LUND, SWEDEN
+*!
+*!***************************************************************************/
+
+
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/miscdevice.h>
+#include <linux/delay.h>
+#include <linux/mutex.h>
+#include <linux/bcd.h>
+#include <linux/capability.h>
+
+#include <asm/uaccess.h>
+#include <arch/svinto.h>
+#include <asm/io.h>
+#include <asm/rtc.h>
+#include <arch/io_interface_mux.h>
+
+#include "i2c.h"
+
+#define RTC_MAJOR_NR 121 /* local major, change later */
+
+static DEFINE_MUTEX(ds1302_mutex);
+static const char ds1302_name[] = "ds1302";
+
+/* The DS1302 might be connected to different bits on different products. 
+ * It has three signals - SDA, SCL and RST. RST and SCL are always outputs,
+ * but SDA can have a selected direction.
+ * For now, only PORT_PB is hardcoded.
+ */
+
+/* The RST bit may be on either the Generic Port or Port PB. */
+#ifdef CONFIG_ETRAX_DS1302_RST_ON_GENERIC_PORT
+#define TK_RST_OUT(x) REG_SHADOW_SET(R_PORT_G_DATA,  port_g_data_shadow,  CONFIG_ETRAX_DS1302_RSTBIT, x)
+#define TK_RST_DIR(x)
+#else
+#define TK_RST_OUT(x) REG_SHADOW_SET(R_PORT_PB_DATA, port_pb_data_shadow, CONFIG_ETRAX_DS1302_RSTBIT, x)
+#define TK_RST_DIR(x) REG_SHADOW_SET(R_PORT_PB_DIR,  port_pb_dir_shadow,  CONFIG_ETRAX_DS1302_RSTBIT, x)
+#endif
+
+
+#define TK_SDA_OUT(x) REG_SHADOW_SET(R_PORT_PB_DATA, port_pb_data_shadow, CONFIG_ETRAX_DS1302_SDABIT, x)
+#define TK_SCL_OUT(x) REG_SHADOW_SET(R_PORT_PB_DATA, port_pb_data_shadow, CONFIG_ETRAX_DS1302_SCLBIT, x)
+
+#define TK_SDA_IN()   ((*R_PORT_PB_READ >> CONFIG_ETRAX_DS1302_SDABIT) & 1)
+/* 1 is out, 0 is in */
+#define TK_SDA_DIR(x) REG_SHADOW_SET(R_PORT_PB_DIR,  port_pb_dir_shadow,  CONFIG_ETRAX_DS1302_SDABIT, x)
+#define TK_SCL_DIR(x) REG_SHADOW_SET(R_PORT_PB_DIR,  port_pb_dir_shadow,  CONFIG_ETRAX_DS1302_SCLBIT, x)
+
+
+/*
+ * The reason for tempudelay and not udelay is that loops_per_usec
+ * (used in udelay) is not set when functions here are called from time.c 
+ */
+
+static void tempudelay(int usecs) 
+{
+	volatile int loops;
+
+	for(loops = usecs * 12; loops > 0; loops--)
+		/* nothing */;	
+}
+
+
+/* Send 8 bits. */
+static void
+out_byte(unsigned char x) 
+{
+	int i;
+	TK_SDA_DIR(1);
+	for (i = 8; i--;) {
+		/* The chip latches incoming bits on the rising edge of SCL. */
+		TK_SCL_OUT(0);
+		TK_SDA_OUT(x & 1);
+		tempudelay(1);
+		TK_SCL_OUT(1);
+		tempudelay(1);
+		x >>= 1;
+	}
+	TK_SDA_DIR(0);
+}
+
+static unsigned char
+in_byte(void) 
+{
+	unsigned char x = 0;
+	int i;
+
+	/* Read byte. Bits come LSB first, on the falling edge of SCL.
+	 * Assume SDA is in input direction already.
+	 */
+	TK_SDA_DIR(0);
+
+	for (i = 8; i--;) {
+		TK_SCL_OUT(0);
+		tempudelay(1);
+		x >>= 1;
+		x |= (TK_SDA_IN() << 7);
+		TK_SCL_OUT(1);
+		tempudelay(1);
+	}
+
+	return x;
+}
+
+/* Prepares for a transaction by de-activating RST (active-low). */
+
+static void
+start(void) 
+{
+	TK_SCL_OUT(0);
+	tempudelay(1);
+	TK_RST_OUT(0);
+	tempudelay(5);
+	TK_RST_OUT(1);	
+}
+
+/* Ends a transaction by taking RST active again. */
+
+static void
+stop(void) 
+{
+	tempudelay(2);
+	TK_RST_OUT(0);
+}
+
+/* Enable writing. */
+
+static void
+ds1302_wenable(void) 
+{
+	start(); 	
+	out_byte(0x8e); /* Write control register  */
+	out_byte(0x00); /* Disable write protect bit 7 = 0 */
+	stop();
+}
+
+/* Disable writing. */
+
+static void
+ds1302_wdisable(void) 
+{
+	start();
+	out_byte(0x8e); /* Write control register  */
+	out_byte(0x80); /* Disable write protect bit 7 = 0 */
+	stop();
+}
+
+
+
+/* Read a byte from the selected register in the DS1302. */
+
+unsigned char
+ds1302_readreg(int reg) 
+{
+	unsigned char x;
+
+	start();
+	out_byte(0x81 | (reg << 1)); /* read register */
+	x = in_byte();
+	stop();
+
+	return x;
+}
+
+/* Write a byte to the selected register. */
+
+void
+ds1302_writereg(int reg, unsigned char val) 
+{
+#ifndef CONFIG_ETRAX_RTC_READONLY
+	int do_writereg = 1;
+#else
+	int do_writereg = 0;
+
+	if (reg == RTC_TRICKLECHARGER)
+		do_writereg = 1;
+#endif
+
+	if (do_writereg) {
+		ds1302_wenable();
+		start();
+		out_byte(0x80 | (reg << 1)); /* write register */
+		out_byte(val);
+		stop();
+		ds1302_wdisable();
+	}
+}
+
+void
+get_rtc_time(struct rtc_time *rtc_tm) 
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+
+	rtc_tm->tm_sec = CMOS_READ(RTC_SECONDS);
+	rtc_tm->tm_min = CMOS_READ(RTC_MINUTES);
+	rtc_tm->tm_hour = CMOS_READ(RTC_HOURS);
+	rtc_tm->tm_mday = CMOS_READ(RTC_DAY_OF_MONTH);
+	rtc_tm->tm_mon = CMOS_READ(RTC_MONTH);
+	rtc_tm->tm_year = CMOS_READ(RTC_YEAR);
+
+	local_irq_restore(flags);
+	
+	rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
+	rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
+	rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
+	rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
+	rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
+	rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
+
+	/*
+	 * Account for differences between how the RTC uses the values
+	 * and how they are defined in a struct rtc_time;
+	 */
+
+	if (rtc_tm->tm_year <= 69)
+		rtc_tm->tm_year += 100;
+
+	rtc_tm->tm_mon--;
+}
+
+static unsigned char days_in_mo[] = 
+    {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
+
+/* ioctl that supports RTC_RD_TIME and RTC_SET_TIME (read and set time/date). */
+
+static int rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	unsigned long flags;
+
+	switch(cmd) {
+		case RTC_RD_TIME:	/* read the time/date from RTC	*/
+		{
+			struct rtc_time rtc_tm;
+						
+			memset(&rtc_tm, 0, sizeof (struct rtc_time));
+			get_rtc_time(&rtc_tm);						
+			if (copy_to_user((struct rtc_time*)arg, &rtc_tm, sizeof(struct rtc_time)))
+				return -EFAULT;	
+			return 0;
+		}
+
+		case RTC_SET_TIME:	/* set the RTC */
+		{
+			struct rtc_time rtc_tm;
+			unsigned char mon, day, hrs, min, sec, leap_yr;
+			unsigned int yrs;
+
+			if (!capable(CAP_SYS_TIME))
+				return -EPERM;
+
+			if (copy_from_user(&rtc_tm, (struct rtc_time*)arg, sizeof(struct rtc_time)))
+				return -EFAULT;
+
+			yrs = rtc_tm.tm_year + 1900;
+			mon = rtc_tm.tm_mon + 1;   /* tm_mon starts at zero */
+			day = rtc_tm.tm_mday;
+			hrs = rtc_tm.tm_hour;
+			min = rtc_tm.tm_min;
+			sec = rtc_tm.tm_sec;
+			
+			
+			if ((yrs < 1970) || (yrs > 2069))
+				return -EINVAL;
+
+			leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400));
+
+			if ((mon > 12) || (day == 0))
+				return -EINVAL;
+
+			if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr)))
+				return -EINVAL;
+			
+			if ((hrs >= 24) || (min >= 60) || (sec >= 60))
+				return -EINVAL;
+
+			if (yrs >= 2000)
+				yrs -= 2000;	/* RTC (0, 1, ... 69) */
+			else
+				yrs -= 1900;	/* RTC (70, 71, ... 99) */
+
+			sec = bin2bcd(sec);
+			min = bin2bcd(min);
+			hrs = bin2bcd(hrs);
+			day = bin2bcd(day);
+			mon = bin2bcd(mon);
+			yrs = bin2bcd(yrs);
+
+			local_irq_save(flags);
+			CMOS_WRITE(yrs, RTC_YEAR);
+			CMOS_WRITE(mon, RTC_MONTH);
+			CMOS_WRITE(day, RTC_DAY_OF_MONTH);
+			CMOS_WRITE(hrs, RTC_HOURS);
+			CMOS_WRITE(min, RTC_MINUTES);
+			CMOS_WRITE(sec, RTC_SECONDS);
+			local_irq_restore(flags);
+
+			/* Notice that at this point, the RTC is updated but
+			 * the kernel is still running with the old time.
+			 * You need to set that separately with settimeofday
+			 * or adjtimex.
+			 */
+			return 0;
+		}
+
+		case RTC_SET_CHARGE: /* set the RTC TRICKLE CHARGE register */
+		{
+			int tcs_val;
+
+			if (!capable(CAP_SYS_TIME))
+				return -EPERM;
+			
+			if(copy_from_user(&tcs_val, (int*)arg, sizeof(int)))
+				return -EFAULT;
+
+			tcs_val = RTC_TCR_PATTERN | (tcs_val & 0x0F);
+			ds1302_writereg(RTC_TRICKLECHARGER, tcs_val);
+			return 0;
+		}
+		case RTC_VL_READ:
+		{
+			/* TODO:
+			 * Implement voltage low detection support
+			 */
+			printk(KERN_WARNING "DS1302: RTC Voltage Low detection"
+			       " is not supported\n");
+			return 0;
+		}
+		case RTC_VL_CLR:
+		{
+			/* TODO:
+			 * Nothing to do since Voltage Low detection is not supported
+			 */
+			return 0;
+		}
+		default:
+			return -ENOIOCTLCMD;
+	}
+}
+
+static long rtc_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	int ret;
+
+	mutex_lock(&ds1302_mutex);
+	ret = rtc_ioctl(file, cmd, arg);
+	mutex_unlock(&ds1302_mutex);
+
+	return ret;
+}
+
+static void
+print_rtc_status(void)
+{
+	struct rtc_time tm;
+
+	get_rtc_time(&tm);
+
+	/*
+	 * There is no way to tell if the luser has the RTC set for local
+	 * time or for Universal Standard Time (GMT). Probably local though.
+	 */
+
+	printk(KERN_INFO "rtc_time\t: %02d:%02d:%02d\n",
+	       tm.tm_hour, tm.tm_min, tm.tm_sec);
+	printk(KERN_INFO "rtc_date\t: %04d-%02d-%02d\n",
+	       tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
+}
+
+/* The various file operations we support. */
+
+static const struct file_operations rtc_fops = {
+	.owner		= THIS_MODULE,
+	.unlocked_ioctl = rtc_unlocked_ioctl,
+	.llseek		= noop_llseek,
+}; 
+
+/* Probe for the chip by writing something to its RAM and try reading it back. */
+
+#define MAGIC_PATTERN 0x42
+
+static int __init
+ds1302_probe(void) 
+{
+	int retval, res; 
+
+	TK_RST_DIR(1);
+	TK_SCL_DIR(1);
+	TK_SDA_DIR(0);
+	
+	/* Try to talk to timekeeper. */
+
+	ds1302_wenable();  
+	start();
+	out_byte(0xc0); /* write RAM byte 0 */	
+	out_byte(MAGIC_PATTERN); /* write something magic */
+	start();
+	out_byte(0xc1); /* read RAM byte 0 */
+
+	if((res = in_byte()) == MAGIC_PATTERN) {
+		stop();
+		ds1302_wdisable();
+		printk(KERN_INFO "%s: RTC found.\n", ds1302_name);
+		printk(KERN_INFO "%s: SDA, SCL, RST on PB%i, PB%i, %s%i\n",
+		       ds1302_name,
+		       CONFIG_ETRAX_DS1302_SDABIT,
+		       CONFIG_ETRAX_DS1302_SCLBIT,
+#ifdef CONFIG_ETRAX_DS1302_RST_ON_GENERIC_PORT
+		       "GENIO",
+#else
+		       "PB",
+#endif
+		       CONFIG_ETRAX_DS1302_RSTBIT);
+		       print_rtc_status();
+		retval = 1;
+	} else {
+		stop();
+		retval = 0;
+	}
+
+	return retval;
+}
+
+
+/* Just probe for the RTC and register the device to handle the ioctl needed. */
+
+int __init
+ds1302_init(void) 
+{
+#ifdef CONFIG_ETRAX_I2C
+	i2c_init();
+#endif
+
+	if (!ds1302_probe()) {
+#ifdef CONFIG_ETRAX_DS1302_RST_ON_GENERIC_PORT
+#if CONFIG_ETRAX_DS1302_RSTBIT == 27
+		/*
+		 * The only way to set g27 to output is to enable ATA.
+		 *
+		 * Make sure that R_GEN_CONFIG is setup correct.
+		 */
+		/* Allocating the ATA interface will grab almost all
+		 * pins in I/O groups a, b, c and d.  A consequence of
+		 * allocating the ATA interface is that the fixed
+		 * interfaces shared RAM, parallel port 0, parallel
+		 * port 1, parallel port W, SCSI-8 port 0, SCSI-8 port
+		 * 1, SCSI-W, serial port 2, serial port 3,
+		 * synchronous serial port 3 and USB port 2 and almost
+		 * all GPIO pins on port g cannot be used.
+		 */
+		if (cris_request_io_interface(if_ata, "ds1302/ATA")) {
+			printk(KERN_WARNING "ds1302: Failed to get IO interface\n");
+			return -1;
+		}
+
+#elif CONFIG_ETRAX_DS1302_RSTBIT == 0
+		if (cris_io_interface_allocate_pins(if_gpio_grp_a,
+						    'g',
+						    CONFIG_ETRAX_DS1302_RSTBIT,
+						    CONFIG_ETRAX_DS1302_RSTBIT)) {
+			printk(KERN_WARNING "ds1302: Failed to get IO interface\n");
+			return -1;
+		}
+
+		/* Set the direction of this bit to out. */
+		genconfig_shadow = ((genconfig_shadow &
+ 				     ~IO_MASK(R_GEN_CONFIG, g0dir)) |
+ 				   (IO_STATE(R_GEN_CONFIG, g0dir, out)));
+		*R_GEN_CONFIG = genconfig_shadow;
+#endif
+		if (!ds1302_probe()) {
+			printk(KERN_WARNING "%s: RTC not found.\n", ds1302_name);
+			return -1;
+		}
+#else
+		printk(KERN_WARNING "%s: RTC not found.\n", ds1302_name);
+		return -1;
+#endif
+  	}
+	/* Initialise trickle charger */
+	ds1302_writereg(RTC_TRICKLECHARGER,
+			RTC_TCR_PATTERN |(CONFIG_ETRAX_DS1302_TRICKLE_CHARGE & 0x0F));
+        /* Start clock by resetting CLOCK_HALT */
+	ds1302_writereg(RTC_SECONDS, (ds1302_readreg(RTC_SECONDS) & 0x7F));
+	return 0;
+}
+
+static int __init ds1302_register(void)
+{
+	ds1302_init();
+	if (register_chrdev(RTC_MAJOR_NR, ds1302_name, &rtc_fops)) {
+		printk(KERN_INFO "%s: unable to get major %d for rtc\n", 
+		       ds1302_name, RTC_MAJOR_NR);
+		return -1;
+	}
+        return 0;
+
+}
+
+module_init(ds1302_register);