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Diffstat (limited to 'arch/cris/arch-v10/drivers/ds1302.c')
-rw-r--r--arch/cris/arch-v10/drivers/ds1302.c515
1 files changed, 0 insertions, 515 deletions
diff --git a/arch/cris/arch-v10/drivers/ds1302.c b/arch/cris/arch-v10/drivers/ds1302.c
deleted file mode 100644
index 74f99c688c8..00000000000
--- a/arch/cris/arch-v10/drivers/ds1302.c
+++ /dev/null
@@ -1,515 +0,0 @@
-/*!***************************************************************************
-*!
-*! 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);
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