Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 602 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 000000000000..fba530fcfaeb
--- /dev/null
+++ b/arch/cris/arch-v10/drivers/ds1302.c
@@ -0,0 +1,602 @@
+/*!***************************************************************************
+*!
+*! FILE NAME  : ds1302.c
+*!
+*! DESCRIPTION: Implements an interface for the DS1302 RTC through Etrax I/O
+*!
+*! Functions exported: ds1302_readreg, ds1302_writereg, ds1302_init
+*!
+*! $Log: ds1302.c,v $
+*! Revision 1.14  2004/08/24 06:48:43  starvik
+*! Whitespace cleanup
+*!
+*! Revision 1.13  2004/05/28 09:26:59  starvik
+*! Modified I2C initialization to work in 2.6.
+*!
+*! Revision 1.12  2004/05/14 07:58:03  starvik
+*! Merge of changes from 2.4
+*!
+*! Revision 1.10  2004/02/04 09:25:12  starvik
+*! Merge of Linux 2.6.2
+*!
+*! Revision 1.9  2003/07/04 08:27:37  starvik
+*! Merge of Linux 2.5.74
+*!
+*! Revision 1.8  2003/04/09 05:20:47  starvik
+*! Merge of Linux 2.5.67
+*!
+*! Revision 1.6  2003/01/09 14:42:51  starvik
+*! Merge of Linux 2.5.55
+*!
+*! Revision 1.4  2002/12/11 13:13:57  starvik
+*! Added arch/ to v10 specific includes
+*! Added fix from Linux 2.4 in serial.c (flush_to_flip_buffer)
+*!
+*! Revision 1.3  2002/11/20 11:56:10  starvik
+*! Merge of Linux 2.5.48
+*!
+*! Revision 1.2  2002/11/18 13:16:06  starvik
+*! Linux 2.5 port of latest 2.4 drivers
+*!
+*! Revision 1.15  2002/10/11 16:14:33  johana
+*! Added CONFIG_ETRAX_DS1302_TRICKLE_CHARGE and initial setting of the
+*! trcklecharge register.
+*!
+*! Revision 1.14  2002/10/10 12:15:38  magnusmn
+*! Added support for having the RST signal on bit g0
+*!
+*! Revision 1.13  2002/05/29 15:16:08  johana
+*! Removed unused variables.
+*!
+*! Revision 1.12  2002/04/10 15:35:25  johana
+*! Moved probe function closer to init function and marked it __init.
+*!
+*! Revision 1.11  2001/06/14 12:35:52  jonashg
+*! The ATA hack is back. It is unfortunately the only way to set g27 to output.
+*!
+*! Revision 1.9  2001/06/14 10:00:14  jonashg
+*! No need for tempudelay to be inline anymore (had to adjust the usec to
+*! loops conversion because of this to make it slow enough to be a udelay).
+*!
+*! Revision 1.8  2001/06/14 08:06:32  jonashg
+*! Made tempudelay delay usecs (well, just a tad more).
+*!
+*! Revision 1.7  2001/06/13 14:18:11  jonashg
+*! Only allow processes with SYS_TIME capability to set time and charge.
+*!
+*! Revision 1.6  2001/06/12 15:22:07  jonashg
+*! * Made init function __init.
+*! * Parameter to out_byte() is unsigned char.
+*! * The magic number 42 has got a name.
+*! * Removed comment about /proc (nothing is exported there).
+*!
+*! Revision 1.5  2001/06/12 14:35:13  jonashg
+*! Gave the module a name and added it to printk's.
+*!
+*! Revision 1.4  2001/05/31 14:53:40  jonashg
+*! Made tempudelay() inline so that the watchdog doesn't reset (see
+*! function comment).
+*!
+*! Revision 1.3  2001/03/26 16:03:06  bjornw
+*! Needs linux/config.h
+*!
+*! Revision 1.2  2001/03/20 19:42:00  bjornw
+*! Use the ETRAX prefix on the DS1302 options
+*!
+*! Revision 1.1  2001/03/20 09:13:50  magnusmn
+*! Linux 2.4 port
+*!
+*! Revision 1.10  2000/07/05 15:38:23  bjornw
+*! Dont update kernel time when a RTC_SET_TIME is done
+*!
+*! Revision 1.9  2000/03/02 15:42:59  macce
+*! * Hack to make RTC work on all 2100/2400
+*!
+*! Revision 1.8  2000/02/23 16:59:18  torbjore
+*! added setup of R_GEN_CONFIG when RTC is connected to the generic port.
+*!
+*! Revision 1.7  2000/01/17 15:51:43  johana
+*! Added RTC_SET_CHARGE ioctl to enable trickle charger.
+*!
+*! Revision 1.6  1999/10/27 13:19:47  bjornw
+*! Added update_xtime_from_cmos which reads back the updated RTC into the kernel.
+*! /dev/rtc calls it now.
+*!
+*! Revision 1.5  1999/10/27 12:39:37  bjornw
+*! Disabled superuser check. Anyone can now set the time.
+*!
+*! Revision 1.4  1999/09/02 13:27:46  pkj
+*! Added shadow for R_PORT_PB_CONFIG.
+*! Renamed port_g_shadow to port_g_data_shadow.
+*!
+*! Revision 1.3  1999/09/02 08:28:06  pkj
+*! Made it possible to select either port PB or the generic port for the RST
+*! signal line to the DS1302 RTC.
+*! Also make sure the RST bit is configured as output on Port PB (if used).
+*!
+*! Revision 1.2  1999/09/01 14:47:20  bjornw
+*! Added support for /dev/rtc operations with ioctl RD_TIME and SET_TIME to read
+*! and set the date. Register as major 121.
+*!
+*! Revision 1.1  1999/09/01 09:45:29  bjornw
+*! Implemented a DS1302 RTC driver.
+*!
+*!
+*! ---------------------------------------------------------------------------
+*!
+*! (C) Copyright 1999, 2000, 2001  Axis Communications AB, LUND, SWEDEN
+*!
+*! $Id: ds1302.c,v 1.14 2004/08/24 06:48:43 starvik Exp $
+*!
+*!***************************************************************************/
+
+#include <linux/config.h>
+
+#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/bcd.h>
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/arch/svinto.h>
+#include <asm/io.h>
+#include <asm/rtc.h>
+
+#define RTC_MAJOR_NR 121 /* local major, change later */
+
+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);
+        local_irq_disable();
+
+        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);
+        
+        BCD_TO_BIN(rtc_tm->tm_sec);
+        BCD_TO_BIN(rtc_tm->tm_min);
+        BCD_TO_BIN(rtc_tm->tm_hour);
+        BCD_TO_BIN(rtc_tm->tm_mday);
+        BCD_TO_BIN(rtc_tm->tm_mon);
+        BCD_TO_BIN(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 inode *inode, 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) */
+
+                        BIN_TO_BCD(sec);
+                        BIN_TO_BCD(min);
+                        BIN_TO_BCD(hrs);
+                        BIN_TO_BCD(day);
+                        BIN_TO_BCD(mon);
+                        BIN_TO_BCD(yrs);
+
+                        local_irq_save(flags);
+                        local_irq_disable();
+                        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_VLOW_RD:
+                {
+                        /* TODO:
+                         * Implement voltage low detection support
+                         */
+                        printk(KERN_WARNING "DS1302: RTC Voltage Low detection"
+                               " is not supported\n");
+                        return 0;
+                }
+                case RTC_VLOW_SET:
+                {
+                        /* TODO:
+                         * Nothing to do since Voltage Low detection is not supported
+                         */
+                        return 0;
+                }
+                default:
+                        return -ENOIOCTLCMD;
+        }
+}
+
+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 struct file_operations rtc_fops = {
+        .owner          = THIS_MODULE,
+        .ioctl          = rtc_ioctl,    
+}; 
+
+/* 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) 
+{
+        i2c_init();
+
+        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.
+                 */
+                genconfig_shadow = ((genconfig_shadow &
+                                     ~IO_MASK(R_GEN_CONFIG, ata)) | 
+                                   (IO_STATE(R_GEN_CONFIG, ata, select)));    
+                *R_GEN_CONFIG = genconfig_shadow;
+#elif CONFIG_ETRAX_DS1302_RSTBIT == 0
+                
+                /* 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);