[PATCH] powerpc: kill ppc64 rtc.c, use genrtc instead

This moves the rtas RTC callbacks to rtas-rtc.c in arch/powerpc/kernel,
and kills the rest of arch/ppc64/kernel/rtc.c which was just a duplicate
of the genrtc functionality. Also enable build of genrtc for
CONFIG_PPC64 (it just works are we already have the required callbacks)
and enable it in all defconfigs.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

2 files changed, 0 insertions, 359 deletions

diff --git a/arch/ppc64/kernel/Makefile b/arch/ppc64/kernel/Makefile
index dac4cc20fa93..d0edea503c49 100644
--- a/arch/ppc64/kernel/Makefile
+++ b/arch/ppc64/kernel/Makefile
@@ -13,7 +13,6 @@ endif
 
 obj-y               +=	idle.o dma.o \
 			align.o \
-			rtc.o \
 			iommu.o
 
 pci-obj-$(CONFIG_PPC_MULTIPLATFORM)	+= pci_dn.o pci_direct_iommu.o
diff --git a/arch/ppc64/kernel/rtc.c b/arch/ppc64/kernel/rtc.c
deleted file mode 100644
index 79e7ed2858dd..000000000000
--- a/arch/ppc64/kernel/rtc.c
+++ /dev/null
@@ -1,358 +0,0 @@
-/*
- *	Real Time Clock interface for PPC64.
- *
- *	Based on rtc.c by Paul Gortmaker
- *
- *	This driver allows use of the real time clock
- *	from user space. It exports the /dev/rtc
- *	interface supporting various ioctl() and also the
- *	/proc/driver/rtc pseudo-file for status information.
- *
- * 	Interface does not support RTC interrupts nor an alarm.
- *
- *	This program is free software; you can redistribute it and/or
- *	modify it under the terms of the GNU General Public License
- *	as published by the Free Software Foundation; either version
- *	2 of the License, or (at your option) any later version.
- *
- *      1.0	Mike Corrigan:    IBM iSeries rtc support
- *      1.1	Dave Engebretsen: IBM pSeries rtc support
- */
-
-#define RTC_VERSION		"1.1"
-
-#include <linux/config.h>
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/types.h>
-#include <linux/miscdevice.h>
-#include <linux/ioport.h>
-#include <linux/fcntl.h>
-#include <linux/mc146818rtc.h>
-#include <linux/init.h>
-#include <linux/poll.h>
-#include <linux/proc_fs.h>
-#include <linux/spinlock.h>
-#include <linux/bcd.h>
-#include <linux/interrupt.h>
-#include <linux/delay.h>
-
-#include <asm/io.h>
-#include <asm/uaccess.h>
-#include <asm/system.h>
-#include <asm/time.h>
-#include <asm/rtas.h>
-
-#include <asm/machdep.h>
-
-/*
- *	We sponge a minor off of the misc major. No need slurping
- *	up another valuable major dev number for this. If you add
- *	an ioctl, make sure you don't conflict with SPARC's RTC
- *	ioctls.
- */
-
-static ssize_t rtc_read(struct file *file, char __user *buf,
-			size_t count, loff_t *ppos);
-
-static int rtc_ioctl(struct inode *inode, struct file *file,
-		     unsigned int cmd, unsigned long arg);
-
-static int rtc_read_proc(char *page, char **start, off_t off,
-                         int count, int *eof, void *data);
-
-/*
- *	If this driver ever becomes modularised, it will be really nice
- *	to make the epoch retain its value across module reload...
- */
-
-static unsigned long epoch = 1900;	/* year corresponding to 0x00	*/
-
-static const unsigned char days_in_mo[] = 
-{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
-
-/*
- *	Now all the various file operations that we export.
- */
-
-static ssize_t rtc_read(struct file *file, char __user *buf,
-			size_t count, loff_t *ppos)
-{
-	return -EIO;
-}
-
-static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
-		     unsigned long arg)
-{
-	struct rtc_time wtime; 
-
-	switch (cmd) {
-	case RTC_RD_TIME:	/* Read the time/date from RTC	*/
-	{
-		memset(&wtime, 0, sizeof(struct rtc_time));
-		ppc_md.get_rtc_time(&wtime);
-		break;
-	}
-	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 -EACCES;
-
-		if (copy_from_user(&rtc_tm, (struct rtc_time __user *)arg,
-				   sizeof(struct rtc_time)))
-			return -EFAULT;
-
-		yrs = rtc_tm.tm_year;
-		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 < 70)
-			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 > 169 )
-			return -EINVAL;
-
-		ppc_md.set_rtc_time(&rtc_tm);
-		
-		return 0;
-	}
-	case RTC_EPOCH_READ:	/* Read the epoch.	*/
-	{
-		return put_user (epoch, (unsigned long __user *)arg);
-	}
-	case RTC_EPOCH_SET:	/* Set the epoch.	*/
-	{
-		/* 
-		 * There were no RTC clocks before 1900.
-		 */
-		if (arg < 1900)
-			return -EINVAL;
-
-		if (!capable(CAP_SYS_TIME))
-			return -EACCES;
-
-		epoch = arg;
-		return 0;
-	}
-	default:
-		return -EINVAL;
-	}
-	return copy_to_user((void __user *)arg, &wtime, sizeof wtime) ? -EFAULT : 0;
-}
-
-static int rtc_open(struct inode *inode, struct file *file)
-{
-	nonseekable_open(inode, file);
-	return 0;
-}
-
-static int rtc_release(struct inode *inode, struct file *file)
-{
-	return 0;
-}
-
-/*
- *	The various file operations we support.
- */
-static struct file_operations rtc_fops = {
-	.owner =	THIS_MODULE,
-	.llseek =	no_llseek,
-	.read =		rtc_read,
-	.ioctl =	rtc_ioctl,
-	.open =		rtc_open,
-	.release =	rtc_release,
-};
-
-static struct miscdevice rtc_dev = {
-	.minor =	RTC_MINOR,
-	.name =		"rtc",
-	.fops =		&rtc_fops
-};
-
-static int __init rtc_init(void)
-{
-	int retval;
-
-	retval = misc_register(&rtc_dev);
-	if(retval < 0)
-		return retval;
-
-#ifdef CONFIG_PROC_FS
-	if (create_proc_read_entry("driver/rtc", 0, NULL, rtc_read_proc, NULL)
-			== NULL) {
-		misc_deregister(&rtc_dev);
-		return -ENOMEM;
-	}
-#endif
-
-	printk(KERN_INFO "i/pSeries Real Time Clock Driver v" RTC_VERSION "\n");
-
-	return 0;
-}
-
-static void __exit rtc_exit (void)
-{
-	remove_proc_entry ("driver/rtc", NULL);
-	misc_deregister(&rtc_dev);
-}
-
-module_init(rtc_init);
-module_exit(rtc_exit);
-
-/*
- *	Info exported via "/proc/driver/rtc".
- */
-
-static int rtc_proc_output (char *buf)
-{
-	
-	char *p;
-	struct rtc_time tm;
-	
-	p = buf;
-
-	ppc_md.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.
-	 */
-	p += sprintf(p,
-		     "rtc_time\t: %02d:%02d:%02d\n"
-		     "rtc_date\t: %04d-%02d-%02d\n"
-	 	     "rtc_epoch\t: %04lu\n",
-		     tm.tm_hour, tm.tm_min, tm.tm_sec,
-		     tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, epoch);
-
-	p += sprintf(p,
-		     "DST_enable\t: no\n"
-		     "BCD\t\t: yes\n"
-		     "24hr\t\t: yes\n" );
-
-	return  p - buf;
-}
-
-static int rtc_read_proc(char *page, char **start, off_t off,
-                         int count, int *eof, void *data)
-{
-        int len = rtc_proc_output (page);
-        if (len <= off+count) *eof = 1;
-        *start = page + off;
-        len -= off;
-        if (len>count) len = count;
-        if (len<0) len = 0;
-        return len;
-}
-
-#ifdef CONFIG_PPC_RTAS
-#define MAX_RTC_WAIT 5000	/* 5 sec */
-#define RTAS_CLOCK_BUSY (-2)
-unsigned long rtas_get_boot_time(void)
-{
-	int ret[8];
-	int error, wait_time;
-	unsigned long max_wait_tb;
-
-	max_wait_tb = __get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT;
-	do {
-		error = rtas_call(rtas_token("get-time-of-day"), 0, 8, ret);
-		if (error == RTAS_CLOCK_BUSY || rtas_is_extended_busy(error)) {
-			wait_time = rtas_extended_busy_delay_time(error);
-			/* This is boot time so we spin. */
-			udelay(wait_time*1000);
-			error = RTAS_CLOCK_BUSY;
-		}
-	} while (error == RTAS_CLOCK_BUSY && (__get_tb() < max_wait_tb));
-
-	if (error != 0 && printk_ratelimit()) {
-		printk(KERN_WARNING "error: reading the clock failed (%d)\n",
-			error);
-		return 0;
-	}
-
-	return mktime(ret[0], ret[1], ret[2], ret[3], ret[4], ret[5]);
-}
-
-/* NOTE: get_rtc_time will get an error if executed in interrupt context
- * and if a delay is needed to read the clock.  In this case we just
- * silently return without updating rtc_tm.
- */
-void rtas_get_rtc_time(struct rtc_time *rtc_tm)
-{
-        int ret[8];
-	int error, wait_time;
-	unsigned long max_wait_tb;
-
-	max_wait_tb = __get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT;
-	do {
-		error = rtas_call(rtas_token("get-time-of-day"), 0, 8, ret);
-		if (error == RTAS_CLOCK_BUSY || rtas_is_extended_busy(error)) {
-			if (in_interrupt() && printk_ratelimit()) {
-				printk(KERN_WARNING "error: reading clock would delay interrupt\n");
-				return;	/* delay not allowed */
-			}
-			wait_time = rtas_extended_busy_delay_time(error);
-			msleep_interruptible(wait_time);
-			error = RTAS_CLOCK_BUSY;
-		}
-	} while (error == RTAS_CLOCK_BUSY && (__get_tb() < max_wait_tb));
-
-        if (error != 0 && printk_ratelimit()) {
-                printk(KERN_WARNING "error: reading the clock failed (%d)\n",
-		       error);
-		return;
-        }
-
-	rtc_tm->tm_sec = ret[5];
-	rtc_tm->tm_min = ret[4];
-	rtc_tm->tm_hour = ret[3];
-	rtc_tm->tm_mday = ret[2];
-	rtc_tm->tm_mon = ret[1] - 1;
-	rtc_tm->tm_year = ret[0] - 1900;
-}
-
-int rtas_set_rtc_time(struct rtc_time *tm)
-{
-	int error, wait_time;
-	unsigned long max_wait_tb;
-
-	max_wait_tb = __get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT;
-	do {
-	        error = rtas_call(rtas_token("set-time-of-day"), 7, 1, NULL,
-				  tm->tm_year + 1900, tm->tm_mon + 1, 
-				  tm->tm_mday, tm->tm_hour, tm->tm_min, 
-				  tm->tm_sec, 0);
-		if (error == RTAS_CLOCK_BUSY || rtas_is_extended_busy(error)) {
-			if (in_interrupt())
-				return 1;	/* probably decrementer */
-			wait_time = rtas_extended_busy_delay_time(error);
-			msleep_interruptible(wait_time);
-			error = RTAS_CLOCK_BUSY;
-		}
-	} while (error == RTAS_CLOCK_BUSY && (__get_tb() < max_wait_tb));
-
-        if (error != 0 && printk_ratelimit())
-                printk(KERN_WARNING "error: setting the clock failed (%d)\n",
-		       error); 
-
-        return 0;
-}
-#endif