patch-2.4.20 linux-2.4.20/arch/ppc/kernel/pmac_time.c

• Lines: 283
• Date: Wed Dec 31 16:00:00 1969
• Orig file: linux-2.4.19/arch/ppc/kernel/pmac_time.c
• Orig date: Mon Feb 25 11:37:55 2002

diff -urN linux-2.4.19/arch/ppc/kernel/pmac_time.c linux-2.4.20/arch/ppc/kernel/pmac_time.c
@@ -1,282 +0,0 @@
-/*
- * BK Id: SCCS/s.pmac_time.c 1.19 12/04/01 01:24:51 benh
- */
-/*
- * Support for periodic interrupts (100 per second) and for getting
- * the current time from the RTC on Power Macintoshes.
- *
- * We use the decrementer register for our periodic interrupts.
- *
- * Paul Mackerras	August 1996.
- * Copyright (C) 1996 Paul Mackerras.
- */
-#include <linux/config.h>
-#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/init.h>
-#include <linux/adb.h>
-#include <linux/cuda.h>
-#include <linux/pmu.h>
-
-#include <asm/sections.h>
-#include <asm/prom.h>
-#include <asm/system.h>
-#include <asm/io.h>
-#include <asm/pgtable.h>
-#include <asm/machdep.h>
-#include <asm/hardirq.h>
-#include <asm/time.h>
-#include <asm/nvram.h>
-
-extern rwlock_t xtime_lock;
-
-/* Apparently the RTC stores seconds since 1 Jan 1904 */
-#define RTC_OFFSET	2082844800
-
-/*
- * 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 */
-
-extern struct timezone sys_tz;
-
-long __init
-pmac_time_init(void)
-{
-#ifdef CONFIG_NVRAM
-	s32 delta = 0;
-	int dst;
-	
-	delta = ((s32)pmac_xpram_read(PMAC_XPRAM_MACHINE_LOC + 0x9)) << 16;
-	delta |= ((s32)pmac_xpram_read(PMAC_XPRAM_MACHINE_LOC + 0xa)) << 8;
-	delta |= pmac_xpram_read(PMAC_XPRAM_MACHINE_LOC + 0xb);
-	if (delta & 0x00800000UL)
-		delta |= 0xFF000000UL;
-	dst = ((pmac_xpram_read(PMAC_XPRAM_MACHINE_LOC + 0x8) & 0x80) != 0);
-	printk("GMT Delta read from XPRAM: %d minutes, DST: %s\n", delta/60,
-		dst ? "on" : "off");
-	return delta;
-#else
-	return 0;
-#endif
-}
-
-unsigned long __pmac
-pmac_get_rtc_time(void)
-{
-#if defined(CONFIG_ADB_CUDA) || defined(CONFIG_ADB_PMU)
-	struct adb_request req;
-	unsigned long now;
-#endif
-
-	/* Get the time from the RTC */
-	switch (sys_ctrler) {
-#ifdef CONFIG_ADB_CUDA
-	case SYS_CTRLER_CUDA:
-		if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_GET_TIME) < 0)
-			return 0;
-		while (!req.complete)
-			cuda_poll();
-		if (req.reply_len != 7)
-			printk(KERN_ERR "pmac_get_rtc_time: got %d byte reply\n",
-			       req.reply_len);
-		now = (req.reply[3] << 24) + (req.reply[4] << 16)
-			+ (req.reply[5] << 8) + req.reply[6];
-		return now - RTC_OFFSET;
-#endif /* CONFIG_ADB_CUDA */
-#ifdef CONFIG_ADB_PMU
-	case SYS_CTRLER_PMU:
-		if (pmu_request(&req, NULL, 1, PMU_READ_RTC) < 0)
-			return 0;
-		while (!req.complete)
-			pmu_poll();
-		if (req.reply_len != 4)
-			printk(KERN_ERR "pmac_get_rtc_time: got %d byte reply\n",
-			       req.reply_len);
-		now = (req.reply[0] << 24) + (req.reply[1] << 16)
-			+ (req.reply[2] << 8) + req.reply[3];
-		return now - RTC_OFFSET;
-#endif /* CONFIG_ADB_PMU */
-	default: ;
-	}
-	return 0;
-}
-
-int __pmac
-pmac_set_rtc_time(unsigned long nowtime)
-{
-#if defined(CONFIG_ADB_CUDA) || defined(CONFIG_ADB_PMU)
-	struct adb_request req;
-#endif
-
-	nowtime += RTC_OFFSET;
-
-	switch (sys_ctrler) {
-#ifdef CONFIG_ADB_CUDA
-	case SYS_CTRLER_CUDA:
-		if (cuda_request(&req, NULL, 6, CUDA_PACKET, CUDA_SET_TIME,
-				 nowtime >> 24, nowtime >> 16, nowtime >> 8, nowtime) < 0)
-			return 0;
-		while (!req.complete)
-			cuda_poll();
-		if ((req.reply_len != 3) && (req.reply_len != 7))
-			printk(KERN_ERR "pmac_set_rtc_time: got %d byte reply\n",
-			       req.reply_len);
-		return 1;
-#endif /* CONFIG_ADB_CUDA */
-#ifdef CONFIG_ADB_PMU
-	case SYS_CTRLER_PMU:
-		if (pmu_request(&req, NULL, 5, PMU_SET_RTC,
-				nowtime >> 24, nowtime >> 16, nowtime >> 8, nowtime) < 0)
-			return 0;
-		while (!req.complete)
-			pmu_poll();
-		if (req.reply_len != 0)
-			printk(KERN_ERR "pmac_set_rtc_time: got %d byte reply\n",
-			       req.reply_len);
-		return 1;
-#endif /* CONFIG_ADB_PMU */
-	default:
-		return 0;
-	}
-}
-
-/*
- * Calibrate the decrementer register using VIA timer 1.
- * This is used both on powermacs and CHRP machines.
- */
-int __init
-via_calibrate_decr(void)
-{
-	struct device_node *vias;
-	volatile unsigned char *via;
-	int count = VIA_TIMER_FREQ_6 / HZ;
-	unsigned int dstart, dend;
-
-	vias = find_devices("via-cuda");
-	if (vias == 0)
-		vias = find_devices("via-pmu");
-	if (vias == 0)
-		vias = find_devices("via");
-	if (vias == 0 || vias->n_addrs == 0)
-		return 0;
-	via = (volatile unsigned char *)
-		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;
-	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);
-
-	return 1;
-}
-
-#ifdef CONFIG_PMAC_PBOOK
-/*
- * Reset the time after a sleep.
- */
-static int __pmac
-time_sleep_notify(struct pmu_sleep_notifier *self, int when)
-{
-	static unsigned long time_diff;
-	unsigned long flags;
-
-	switch (when) {
-	case PBOOK_SLEEP_NOW:
-		read_lock_irqsave(&xtime_lock, flags);
-		time_diff = xtime.tv_sec - pmac_get_rtc_time();
-		read_unlock_irqrestore(&xtime_lock, flags);
-		break;
-	case PBOOK_WAKE:
-		write_lock_irqsave(&xtime_lock, flags);
-		xtime.tv_sec = pmac_get_rtc_time() + time_diff;
-		xtime.tv_usec = 0;
-		last_rtc_update = xtime.tv_sec;
-		write_unlock_irqrestore(&xtime_lock, flags);
-		break;
-	}
-	return PBOOK_SLEEP_OK;
-}
-
-static struct pmu_sleep_notifier time_sleep_notifier __pmacdata = {
-	time_sleep_notify, SLEEP_LEVEL_MISC,
-};
-#endif /* CONFIG_PMAC_PBOOK */
-
-/*
- * Query the OF and get the decr frequency.
- * This was taken from the pmac time_init() when merging the prep/pmac
- * time functions.
- */
-void __init
-pmac_calibrate_decr(void)
-{
-	struct device_node *cpu;
-	unsigned int freq, *fp;
-
-#ifdef CONFIG_PMAC_PBOOK
-	pmu_register_sleep_notifier(&time_sleep_notifier);
-#endif /* CONFIG_PMAC_PBOOK */
-
-	/* We assume MacRISC2 machines have correct device-tree
-	 * calibration. That's better since the VIA itself seems
-	 * to be slightly off. --BenH
-	 */
-	if (!machine_is_compatible("MacRISC2"))
-		if (via_calibrate_decr())
-			return;
-
-	/*
-	 * The cpu node should have a timebase-frequency property
-	 * to tell us the rate at which the decrementer counts.
-	 */
-	cpu = find_type_devices("cpu");
-	if (cpu == 0)
-		panic("can't find cpu node in time_init");
-	fp = (unsigned int *) get_property(cpu, "timebase-frequency", NULL);
-	if (fp == 0)
-		panic("can't get cpu timebase frequency");
-	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);
-}