diff options
Diffstat (limited to 'arch/ppc/platforms/chrp_time.c')
| -rw-r--r-- | arch/ppc/platforms/chrp_time.c | 251 |
1 files changed, 0 insertions, 251 deletions
diff --git a/arch/ppc/platforms/chrp_time.c b/arch/ppc/platforms/chrp_time.c deleted file mode 100644 index c862777..0000000 --- a/arch/ppc/platforms/chrp_time.c +++ /dev/null @@ -1,251 +0,0 @@ -/* - * Copyright (C) 1991, 1992, 1995 Linus Torvalds - * - * Adapted for PowerPC (PReP) by Gary Thomas - * Modified by Cort Dougan (cort@cs.nmt.edu). - * Copied and modified from arch/i386/kernel/time.c - * - */ -#include <linux/errno.h> -#include <linux/sched.h> -#include <linux/kernel.h> -#include <linux/param.h> -#include <linux/string.h> -#include <linux/mm.h> -#include <linux/interrupt.h> -#include <linux/time.h> -#include <linux/timex.h> -#include <linux/kernel_stat.h> -#include <linux/mc146818rtc.h> -#include <linux/init.h> -#include <linux/bcd.h> - -#include <asm/io.h> -#include <asm/nvram.h> -#include <asm/prom.h> -#include <asm/sections.h> -#include <asm/time.h> - -extern spinlock_t rtc_lock; - -static int nvram_as1 = NVRAM_AS1; -static int nvram_as0 = NVRAM_AS0; -static int nvram_data = NVRAM_DATA; - -long __init chrp_time_init(void) -{ - struct device_node *rtcs; - int base; - - rtcs = find_compatible_devices("rtc", "pnpPNP,b00"); - if (rtcs == NULL) - rtcs = find_compatible_devices("rtc", "ds1385-rtc"); - if (rtcs == NULL || rtcs->addrs == NULL) - return 0; - base = rtcs->addrs[0].address; - nvram_as1 = 0; - nvram_as0 = base; - nvram_data = base + 1; - - return 0; -} - -int chrp_cmos_clock_read(int addr) -{ - if (nvram_as1 != 0) - outb(addr>>8, nvram_as1); - outb(addr, nvram_as0); - return (inb(nvram_data)); -} - -void chrp_cmos_clock_write(unsigned long val, int addr) -{ - if (nvram_as1 != 0) - outb(addr>>8, nvram_as1); - outb(addr, nvram_as0); - outb(val, nvram_data); - return; -} - -/* - * Set the hardware clock. -- Cort - */ -int chrp_set_rtc_time(unsigned long nowtime) -{ - unsigned char save_control, save_freq_select; - struct rtc_time tm; - - spin_lock(&rtc_lock); - to_tm(nowtime, &tm); - - save_control = chrp_cmos_clock_read(RTC_CONTROL); /* tell the clock it's being set */ - - chrp_cmos_clock_write((save_control|RTC_SET), RTC_CONTROL); - - save_freq_select = chrp_cmos_clock_read(RTC_FREQ_SELECT); /* stop and reset prescaler */ - - chrp_cmos_clock_write((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT); - - tm.tm_year -= 1900; - if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { - BIN_TO_BCD(tm.tm_sec); - BIN_TO_BCD(tm.tm_min); - BIN_TO_BCD(tm.tm_hour); - BIN_TO_BCD(tm.tm_mon); - BIN_TO_BCD(tm.tm_mday); - BIN_TO_BCD(tm.tm_year); - } - chrp_cmos_clock_write(tm.tm_sec,RTC_SECONDS); - chrp_cmos_clock_write(tm.tm_min,RTC_MINUTES); - chrp_cmos_clock_write(tm.tm_hour,RTC_HOURS); - chrp_cmos_clock_write(tm.tm_mon,RTC_MONTH); - chrp_cmos_clock_write(tm.tm_mday,RTC_DAY_OF_MONTH); - chrp_cmos_clock_write(tm.tm_year,RTC_YEAR); - - /* The following flags have to be released exactly in this order, - * otherwise the DS12887 (popular MC146818A clone with integrated - * battery and quartz) will not reset the oscillator and will not - * update precisely 500 ms later. You won't find this mentioned in - * the Dallas Semiconductor data sheets, but who believes data - * sheets anyway ... -- Markus Kuhn - */ - chrp_cmos_clock_write(save_control, RTC_CONTROL); - chrp_cmos_clock_write(save_freq_select, RTC_FREQ_SELECT); - - spin_unlock(&rtc_lock); - return 0; -} - -unsigned long chrp_get_rtc_time(void) -{ - unsigned int year, mon, day, hour, min, sec; - int uip, i; - - /* The Linux interpretation of the CMOS clock register contents: - * When the Update-In-Progress (UIP) flag goes from 1 to 0, the - * RTC registers show the second which has precisely just started. - * Let's hope other operating systems interpret the RTC the same way. - */ - - /* Since the UIP flag is set for about 2.2 ms and the clock - * is typically written with a precision of 1 jiffy, trying - * to obtain a precision better than a few milliseconds is - * an illusion. Only consistency is interesting, this also - * allows to use the routine for /dev/rtc without a potential - * 1 second kernel busy loop triggered by any reader of /dev/rtc. - */ - - for ( i = 0; i<1000000; i++) { - uip = chrp_cmos_clock_read(RTC_FREQ_SELECT); - sec = chrp_cmos_clock_read(RTC_SECONDS); - min = chrp_cmos_clock_read(RTC_MINUTES); - hour = chrp_cmos_clock_read(RTC_HOURS); - day = chrp_cmos_clock_read(RTC_DAY_OF_MONTH); - mon = chrp_cmos_clock_read(RTC_MONTH); - year = chrp_cmos_clock_read(RTC_YEAR); - uip |= chrp_cmos_clock_read(RTC_FREQ_SELECT); - if ((uip & RTC_UIP)==0) break; - } - - if (!(chrp_cmos_clock_read(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD) - { - BCD_TO_BIN(sec); - BCD_TO_BIN(min); - BCD_TO_BIN(hour); - BCD_TO_BIN(day); - BCD_TO_BIN(mon); - BCD_TO_BIN(year); - } - if ((year += 1900) < 1970) - year += 100; - return mktime(year, mon, day, hour, min, sec); -} - -/* - * Calibrate the decrementer frequency with the VIA timer 1. - */ -#define VIA_TIMER_FREQ_6 4700000 /* time 1 frequency * 6 */ - -/* VIA registers */ -#define RS 0x200 /* skip between registers */ -#define T1CL (4*RS) /* Timer 1 ctr/latch (low 8 bits) */ -#define T1CH (5*RS) /* Timer 1 counter (high 8 bits) */ -#define T1LL (6*RS) /* Timer 1 latch (low 8 bits) */ -#define T1LH (7*RS) /* Timer 1 latch (high 8 bits) */ -#define ACR (11*RS) /* Auxiliary control register */ -#define IFR (13*RS) /* Interrupt flag register */ - -/* Bits in ACR */ -#define T1MODE 0xc0 /* Timer 1 mode */ -#define T1MODE_CONT 0x40 /* continuous interrupts */ - -/* Bits in IFR and IER */ -#define T1_INT 0x40 /* Timer 1 interrupt */ - -static int __init chrp_via_calibrate_decr(void) -{ - struct device_node *vias; - volatile unsigned char __iomem *via; - int count = VIA_TIMER_FREQ_6 / 100; - unsigned int dstart, dend; - - vias = find_devices("via-cuda"); - if (vias == 0) - vias = find_devices("via"); - if (vias == 0 || vias->n_addrs == 0) - return 0; - via = ioremap(vias->addrs[0].address, vias->addrs[0].size); - - /* set timer 1 for continuous interrupts */ - out_8(&via[ACR], (via[ACR] & ~T1MODE) | T1MODE_CONT); - /* set the counter to a small value */ - out_8(&via[T1CH], 2); - /* set the latch to `count' */ - out_8(&via[T1LL], count); - out_8(&via[T1LH], count >> 8); - /* wait until it hits 0 */ - while ((in_8(&via[IFR]) & T1_INT) == 0) - ; - dstart = get_dec(); - /* clear the interrupt & wait until it hits 0 again */ - in_8(&via[T1CL]); - while ((in_8(&via[IFR]) & T1_INT) == 0) - ; - dend = get_dec(); - - tb_ticks_per_jiffy = (dstart - dend) / ((6 * HZ)/100); - tb_to_us = mulhwu_scale_factor(dstart - dend, 60000); - - printk(KERN_INFO "via_calibrate_decr: ticks per jiffy = %u (%u ticks)\n", - tb_ticks_per_jiffy, dstart - dend); - - iounmap(via); - - return 1; -} - -void __init chrp_calibrate_decr(void) -{ - struct device_node *cpu; - unsigned int freq, *fp; - - if (chrp_via_calibrate_decr()) - return; - - /* - * The cpu node should have a timebase-frequency property - * to tell us the rate at which the decrementer counts. - */ - freq = 16666000; /* hardcoded default */ - cpu = find_type_devices("cpu"); - if (cpu != 0) { - fp = (unsigned int *) - get_property(cpu, "timebase-frequency", NULL); - if (fp != 0) - freq = *fp; - } - printk("time_init: decrementer frequency = %u.%.6u MHz\n", - freq/1000000, freq%1000000); - tb_ticks_per_jiffy = freq / HZ; - tb_to_us = mulhwu_scale_factor(freq, 1000000); -} |
