Commit 5847098c authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'for-linus' of git://www.jni.nu/cris 

* 'for-linus' of git://www.jni.nu/cris:
  Correct auto-restart of syscalls via restartblock
  CRISv10: Fix return before mutex_unlock in pcf8563
  Drop the CRISv32 version of pcf8563
parents 7f5fe3ec 33dc0ad7

arch/cris/Kconfig

+1 −2
Original line number Diff line number Diff line
@@ -296,8 +296,7 @@ config ETRAX_RTC 
choice

	prompt "RTC chip"

	depends on ETRAX_RTC

	default ETRAX_PCF8563 if ETRAX_ARCH_V32

	default ETRAX_DS1302 if ETRAX_ARCH_V10

	default ETRAX_DS1302



config ETRAX_DS1302

	depends on ETRAX_ARCH_V10

arch/cris/arch-v10/drivers/pcf8563.c

+1 −1
Original line number Diff line number Diff line
@@ -345,7 +345,7 @@ static long pcf8563_unlocked_ioctl(struct file *filp, unsigned int cmd, unsigned 
	int ret;



	mutex_lock(&pcf8563_mutex);

	return pcf8563_ioctl(filp, cmd, arg);

	ret = pcf8563_ioctl(filp, cmd, arg);

	mutex_unlock(&pcf8563_mutex);



	return ret;

arch/cris/arch-v10/kernel/signal.c

+1 −1
Original line number Diff line number Diff line
@@ -537,7 +537,7 @@ void do_signal(int canrestart, struct pt_regs *regs) 
			RESTART_CRIS_SYS(regs);

		}

		if (regs->r10 == -ERESTART_RESTARTBLOCK) {

			regs->r10 = __NR_restart_syscall;

			regs->r9 = __NR_restart_syscall;

			regs->irp -= 2;

		}

	}

arch/cris/arch-v32/drivers/Makefile

+0 −1
Original line number Diff line number Diff line
@@ -7,7 +7,6 @@ obj-$(CONFIG_ETRAX_AXISFLASHMAP) += axisflashmap.o 
obj-$(CONFIG_ETRAXFS)                   += mach-fs/

obj-$(CONFIG_CRIS_MACH_ARTPEC3)         += mach-a3/

obj-$(CONFIG_ETRAX_IOP_FW_LOAD)         += iop_fw_load.o

obj-$(CONFIG_ETRAX_PCF8563)		+= pcf8563.o

obj-$(CONFIG_ETRAX_I2C)			+= i2c.o

obj-$(CONFIG_ETRAX_SYNCHRONOUS_SERIAL)	+= sync_serial.o

obj-$(CONFIG_PCI)			+= pci/

arch/cris/arch-v32/drivers/pcf8563.c

deleted100644 → 0
+0 −377
Original line number Diff line number Diff line 
/*

 * PCF8563 RTC

 *

 * From Phillips' datasheet:

 *

 * The PCF8563 is a CMOS real-time clock/calendar optimized for low power

 * consumption. A programmable clock output, interrupt 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 byte.

 *

 * Copyright (c) 2002-2007, Axis Communications AB

 * All rights reserved.

 *

 * Author: Tobias Anderberg <tobiasa@axis.com>.

 *

 */



#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 <linux/mutex.h>



#include <asm/uaccess.h>

#include <asm/system.h>

#include <asm/io.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: 1.17 $"



/* 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 DEFINE_MUTEX(pcf8563_mutex);

static DEFINE_MUTEX(rtc_lock); /* Protect state etc */



static const unsigned char days_in_month[] =

	{ 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };



static long pcf8563_unlocked_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);



/* Cache VL bit value read at driver init since writing the RTC_SECOND

 * register clears the VL status.

 */

static int voltage_low;



static const struct file_operations pcf8563_fops = {

	.owner		= THIS_MODULE,

	.unlocked_ioctl = pcf8563_unlocked_ioctl,

	.llseek		= noop_llseek,

};



unsigned char

pcf8563_readreg(int reg)

{

	unsigned char res = rtc_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_WEEKDAY:

			res &= 0x07;

			break;

		case RTC_MONTH:

			res &= 0x1F;

			break;

		case RTC_CONTROL1:

			res &= 0xA8;

			break;

		case RTC_CONTROL2:

			res &= 0x1F;

			break;

		case RTC_CLOCKOUT_FREQ:

		case RTC_TIMER_CONTROL:

			res &= 0x83;

			break;

	}

	return res;

}



void

pcf8563_writereg(int reg, unsigned char val)

{

	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_wday = rtc_read(RTC_WEEKDAY);

	tm->tm_mon  = rtc_read(RTC_MONTH);

	tm->tm_year = rtc_read(RTC_YEAR);



	if (tm->tm_sec & 0x80) {

		printk(KERN_ERR "%s: RTC Voltage Low - reliable date/time "

		       "information is no longer guaranteed!\n", PCF8563_NAME);

	}



	tm->tm_year  = bcd2bin(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_wday &= 0x07; /* Not coded in BCD. */

	tm->tm_mon  &= 0x1F;



	tm->tm_sec = bcd2bin(tm->tm_sec);

	tm->tm_min = bcd2bin(tm->tm_min);

	tm->tm_hour = bcd2bin(tm->tm_hour);

	tm->tm_mday = bcd2bin(tm->tm_mday);

	tm->tm_mon = bcd2bin(tm->tm_mon);

	tm->tm_mon--; /* Month is 1..12 in RTC but 0..11 in linux */

}



int __init

pcf8563_init(void)

{

	static int res;

	static int first = 1;



	if (!first)

		return res;

	first = 0;



	/* Initiate the i2c protocol. */

	res = i2c_init();

	if (res < 0) {

		printk(KERN_CRIT "pcf8563_init: Failed to init i2c.\n");

		return res;

	}



	/*

	 * First of all we need to reset the chip. This is done by

	 * clearing control1, control2 and clk freq 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;



	if (rtc_write(RTC_TIMER_CONTROL, 0x03) < 0)

		goto err;



	/* Reset the alarms. */

	if (rtc_write(RTC_MINUTE_ALARM, 0x80) < 0)

		goto err;



	if (rtc_write(RTC_HOUR_ALARM, 0x80) < 0)

		goto err;



	if (rtc_write(RTC_DAY_ALARM, 0x80) < 0)

		goto err;



	if (rtc_write(RTC_WEEKDAY_ALARM, 0x80) < 0)

		goto err;



	/* Check for low voltage, and warn about it. */

	if (rtc_read(RTC_SECONDS) & 0x80) {

		voltage_low = 1;

		printk(KERN_WARNING "%s: RTC Voltage Low - reliable "

		       "date/time information is no longer guaranteed!\n",

		       PCF8563_NAME);

	}



	return res;



err:

	printk(KERN_INFO "%s: Error initializing chip.\n", PCF8563_NAME);

	res = -1;

	return res;

}



void __exit

pcf8563_exit(void)

{

	unregister_chrdev(PCF8563_MAJOR, DEVICE_NAME);

}



/*

 * ioctl calls for this driver. Why return -ENOTTY upon error? Because

 * POSIX says so!

 */

static int pcf8563_ioctl(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;



		mutex_lock(&rtc_lock);

		memset(&tm, 0, sizeof tm);

		get_rtc_time(&tm);



		if (copy_to_user((struct rtc_time *) arg, &tm,

				 sizeof tm)) {

			mutex_unlock(&rtc_lock);

			return -EFAULT;

		}



		mutex_unlock(&rtc_lock);



		return 0;

	}

	case RTC_SET_TIME:

	{

		int leap;

		int year;

		int century;

		struct rtc_time tm;



		memset(&tm, 0, sizeof tm);

		if (!capable(CAP_SYS_TIME))

			return -EPERM;



		if (copy_from_user(&tm, (struct rtc_time *) arg,

				   sizeof tm))

			return -EFAULT;



		/* Convert from struct tm to struct rtc_time. */

		tm.tm_year += 1900;

		tm.tm_mon += 1;



		/*

		 * Check if tm.tm_year is a leap year. A year is a leap

		 * year if it is divisible by 4 but not 100, except

		 * that years divisible by 400 _are_ leap years.

		 */

		year = tm.tm_year;

		leap = (tm.tm_mon == 2) &&

			((year % 4 == 0 && year % 100 != 0) || year % 400 == 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_wday >= 7) ||

		    (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;



		tm.tm_year = bin2bcd(tm.tm_year);

		tm.tm_mon = bin2bcd(tm.tm_mon);

		tm.tm_mday = bin2bcd(tm.tm_mday);

		tm.tm_hour = bin2bcd(tm.tm_hour);

		tm.tm_min = bin2bcd(tm.tm_min);

		tm.tm_sec = bin2bcd(tm.tm_sec);

		tm.tm_mon |= century;



		mutex_lock(&rtc_lock);



		rtc_write(RTC_YEAR, tm.tm_year);

		rtc_write(RTC_MONTH, tm.tm_mon);

		rtc_write(RTC_WEEKDAY, tm.tm_wday); /* Not coded in BCD. */

		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);



		mutex_unlock(&rtc_lock);



		return 0;

	}

	case RTC_VL_READ:

		if (voltage_low)

			printk(KERN_ERR "%s: RTC Voltage Low - "

			       "reliable date/time information is no "

			       "longer guaranteed!\n", PCF8563_NAME);



		if (copy_to_user((int *) arg, &voltage_low, sizeof(int)))

			return -EFAULT;

		return 0;



	case RTC_VL_CLR:

	{

		/* Clear the VL bit in the seconds register in case

		 * the time has not been set already (which would

		 * have cleared it). This does not really matter

		 * because of the cached voltage_low value but do it

		 * anyway for consistency. */



		int ret = rtc_read(RTC_SECONDS);



		rtc_write(RTC_SECONDS, (ret & 0x7F));



		/* Clear the cached value. */

		voltage_low = 0;



		return 0;

	}

	default:

		return -ENOTTY;

	}



	return 0;

}



static long pcf8563_unlocked_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)

{

	int ret;



	mutex_lock(&pcf8563_mutex);

	return pcf8563_ioctl(filp, cmd, arg);

	mutex_unlock(&pcf8563_mutex);



	return ret;

}



static int __init pcf8563_register(void)

{

	if (pcf8563_init() < 0) {

		printk(KERN_INFO "%s: Unable to initialize Real-Time Clock "

		       "Driver, %s\n", PCF8563_NAME, DRIVER_VERSION);

		return -1;

	}



	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);



	/* Check for low voltage, and warn about it. */

	if (voltage_low) {

		printk(KERN_WARNING "%s: RTC Voltage Low - reliable date/time "

		       "information is no longer guaranteed!\n", PCF8563_NAME);

	}



	return 0;

}



module_init(pcf8563_register);

module_exit(pcf8563_exit);

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