diff options
Diffstat (limited to 'arch/ppc64/kernel/rtc.c')
-rw-r--r-- | arch/ppc64/kernel/rtc.c | 400 |
1 files changed, 0 insertions, 400 deletions
diff --git a/arch/ppc64/kernel/rtc.c b/arch/ppc64/kernel/rtc.c deleted file mode 100644 index 6ff52bc6132..00000000000 --- a/arch/ppc64/kernel/rtc.c +++ /dev/null @@ -1,400 +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/iSeries/mf.h> -#include <asm/machdep.h> - -extern int piranha_simulator; - -/* - * 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_ISERIES -/* - * Get the RTC from the virtual service processor - * This requires flowing LpEvents to the primary partition - */ -void iSeries_get_rtc_time(struct rtc_time *rtc_tm) -{ - if (piranha_simulator) - return; - - mf_get_rtc(rtc_tm); - rtc_tm->tm_mon--; -} - -/* - * Set the RTC in the virtual service processor - * This requires flowing LpEvents to the primary partition - */ -int iSeries_set_rtc_time(struct rtc_time *tm) -{ - mf_set_rtc(tm); - return 0; -} - -void iSeries_get_boot_time(struct rtc_time *tm) -{ - if ( piranha_simulator ) - return; - - mf_get_boot_rtc(tm); - tm->tm_mon -= 1; -} -#endif - -#ifdef CONFIG_PPC_RTAS -#define MAX_RTC_WAIT 5000 /* 5 sec */ -#define RTAS_CLOCK_BUSY (-2) -void rtas_get_boot_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)) { - 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; - } - - 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; -} - -/* 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 |