patch-2.4.6 linux/drivers/acpi/cpu.c

• Lines: 354
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.4.5/linux/drivers/acpi/cpu.c
• Orig date: Fri Feb 9 11:45:58 2001

diff -u --recursive --new-file v2.4.5/linux/drivers/acpi/cpu.c linux/drivers/acpi/cpu.c
@@ -1,353 +0,0 @@
-/*
- *  cpu.c - Processor handling
- *
- *  Copyright (C) 2000 Andrew Henroid
- *  Copyright (C) 2001 Andrew Grover
- *
- *  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.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
- */
-
-#include <linux/config.h>
-#include <linux/kernel.h>
-#include <linux/pm.h>
-#include <linux/acpi.h>
-#include "acpi.h"
-#include "driver.h"
-
-#define _COMPONENT	OS_DEPENDENT
-	MODULE_NAME	("cpu")
-
-u32 acpi_c2_exit_latency = ACPI_INFINITE;
-u32 acpi_c3_exit_latency = ACPI_INFINITE;
-u32 acpi_c2_enter_latency = ACPI_INFINITE;
-u32 acpi_c3_enter_latency = ACPI_INFINITE;
-u32 acpi_use_idle = TRUE;
-
-u32 acpi_c1_count = 0;
-u32 acpi_c2_count = 0;
-u32 acpi_c3_count = 0;
-
-static u32 acpi_pblk = ACPI_INVALID;
-static int acpi_c2_tested = 0;
-static int acpi_c3_tested = 0;
-static int acpi_max_c_state = 1;
-static int acpi_pm_tmr_len = 24;
-
-#define CPU_POWER_STATES	3
-#define MAX_C2_LATENCY		100
-#define MAX_C3_LATENCY		1000
-
-#define ACPI_STATE_C1		0
-#define ACPI_STATE_C2		1
-#define ACPI_STATE_C3		2
-
-/*
- * Clear busmaster activity flag
- */
-static inline void
-acpi_clear_bm_activity(void)
-{
-	acpi_hw_register_bit_access(ACPI_WRITE, ACPI_MTX_LOCK, BM_STS, 1);
-}
-
-/*
- * Returns 1 if there has been busmaster activity
- */
-static inline int
-acpi_bm_activity(void)
-{
-	return acpi_hw_register_bit_access(ACPI_READ, ACPI_MTX_LOCK, BM_STS);
-}
-
-/*
- * Set system to sleep through busmaster requests
- */
-static void
-acpi_sleep_on_busmaster(void)
-{
-	acpi_hw_register_bit_access (ACPI_WRITE, ACPI_MTX_LOCK, BM_RLD, 1);
-}
-
-/*
- * Set system to wake on busmaster requests
- */
-static void
-acpi_wake_on_busmaster(void)
-{
-	acpi_hw_register_bit_access (ACPI_WRITE, ACPI_MTX_LOCK, BM_RLD, 0);
-}
-
-u32
-acpi_read_pm_timer(void)
-{
-	return acpi_hw_register_read(ACPI_MTX_LOCK, PM_TIMER);
-}
-
-/*
- * Do a compare, accounting for 24/32bit rollover
- */
-static u32
-acpi_compare_pm_timers(u32 first, u32 second)
-{
-	if (first < second) {
-		return (second - first);
-	} else {
-		if (acpi_pm_tmr_len == 24)
-			return (second + (0xFFFFFF - first));
-		else
-			return (second + (0xFFFFFFFF - first));
-	}
-}
-
-
-/*
- * Idle loop (uniprocessor only)
- */
-static void
-acpi_idle(void)
-{
-	static int sleep_level = 1;
-	FADT_DESCRIPTOR *fadt = &acpi_fadt;
-
-	/*
-	 * start from the previous sleep level.
-	 * if not initialized, we goto sleep1
-	 */
-	if (sleep_level == 1
-	    || acpi_max_c_state < 2)
-		goto sleep1;
-
-	if (sleep_level == 2
-	    || acpi_max_c_state < 3)
-		goto sleep2;
-
-sleep3:
-	sleep_level = 3;
-	if (!acpi_c3_tested) {
-		DEBUG_PRINT(ACPI_INFO, ("C3 works\n"));
-		acpi_c3_tested = 1;
-	}
-	acpi_wake_on_busmaster();
-	if (fadt->Xpm2_cnt_blk.address)
-		goto sleep3_with_arbiter;
-
-	for (;;) {
-		unsigned long time;
-		unsigned long diff;
-		
-		__cli();
-		if (current->need_resched)
-			goto out;
-		if (acpi_bm_activity())
-			goto sleep2;
-
-		time = acpi_read_pm_timer();
-		acpi_c3_count++;
-		inb(acpi_pblk + ACPI_P_LVL3);
-		/* Dummy read, force synchronization with the PMU */
-		acpi_read_pm_timer();
-		diff = acpi_compare_pm_timers(time, acpi_read_pm_timer());
-
-		__sti();
-		if (diff < acpi_c3_exit_latency)
-			goto sleep1;
-	}
-
-sleep3_with_arbiter:
-	for (;;) {
-		unsigned long time;
-		unsigned long diff;
-
-		__cli();
-		if (current->need_resched)
-			goto out;
-		if (acpi_bm_activity())
-			goto sleep2;
-
-		time = acpi_read_pm_timer();
-		
-		/* Disable arbiter, park on CPU */
-		acpi_hw_register_bit_access(ACPI_WRITE, ACPI_MTX_LOCK, ARB_DIS, 1);
-		acpi_c3_count++;
-		inb(acpi_pblk + ACPI_P_LVL3);
-		/* Dummy read, force synchronization with the PMU */
-		acpi_read_pm_timer();
-		diff = acpi_compare_pm_timers(time, acpi_read_pm_timer());
-		/* Enable arbiter again.. */
-		acpi_hw_register_bit_access(ACPI_WRITE, ACPI_MTX_LOCK, ARB_DIS, 0);
-
-		__sti();
-		if (diff < acpi_c3_exit_latency)
-			goto sleep1;
-	}
-
-sleep2:
-	sleep_level = 2;
-	if (!acpi_c2_tested) {
-		DEBUG_PRINT(ACPI_INFO, ("C2 works\n"));
-		acpi_c2_tested = 1;
-	}
-	acpi_wake_on_busmaster();	/* Required to track BM activity.. */
-	for (;;) {
-		unsigned long time;
-		unsigned long diff;
-
-		__cli();
-		if (current->need_resched)
-			goto out;
-
-		time = acpi_read_pm_timer();
-		acpi_c2_count++;
-		inb(acpi_pblk + ACPI_P_LVL2);
-		/* Dummy read, force synchronization with the PMU */
-		acpi_read_pm_timer();
-		diff = acpi_compare_pm_timers(time, acpi_read_pm_timer());
-
-		__sti();
-		if (diff < acpi_c2_exit_latency)
-			goto sleep1;
-		if (acpi_bm_activity()) {
-			acpi_clear_bm_activity();
-			continue;
-		}
-		if (diff > acpi_c3_enter_latency
-		    && acpi_max_c_state >= 3)
-			goto sleep3;
-	}
-
-sleep1:
-	sleep_level = 1;
-	acpi_sleep_on_busmaster();
-	for (;;) {
-		unsigned long time;
-		unsigned long diff;
-
-		__cli();
-		if (current->need_resched)
-			goto out;
-		time = acpi_read_pm_timer();
-		acpi_c1_count++;
-		safe_halt();
-		diff = acpi_compare_pm_timers(time, acpi_read_pm_timer());
-		if (diff > acpi_c2_enter_latency
-		    && acpi_max_c_state >= 2)
-			goto sleep2;
-	}
-
-out:
-	__sti();
-}
-
-/*
- * Get processor information
- */
-static ACPI_STATUS
-acpi_found_cpu(ACPI_HANDLE handle, u32 level, void *ctx, void **value)
-{
-	ACPI_OBJECT obj;
-	ACPI_BUFFER buf;
-
-	buf.length = sizeof(obj);
-	buf.pointer = &obj;
-	if (!ACPI_SUCCESS(acpi_evaluate_object(handle, NULL, NULL, &buf)))
-		return AE_OK;
-
-	DEBUG_PRINT(ACPI_INFO, ("PBLK %d @ 0x%04x:%d\n",
-			obj.processor.proc_id,
-			obj.processor.pblk_address,
-			obj.processor.pblk_length));
-
-	if (acpi_pblk != ACPI_INVALID
-	    || !obj.processor.pblk_address
-	    || obj.processor.pblk_length != 6)
-		return AE_OK;
-
-	acpi_pblk = obj.processor.pblk_address;
-
-	if (acpi_fadt.plvl2_lat
-	    && acpi_fadt.plvl2_lat <= MAX_C2_LATENCY) {
-		acpi_c2_exit_latency
-			= ACPI_MICROSEC_TO_TMR_TICKS(acpi_fadt.plvl2_lat);
-		acpi_c2_enter_latency
-			= ACPI_MICROSEC_TO_TMR_TICKS(acpi_fadt.plvl2_lat * 4);
-		acpi_max_c_state = 2;
-
-		printk(KERN_INFO "ACPI: System firmware supports: C2");
-			
-		if (acpi_fadt.plvl3_lat
-		    && acpi_fadt.plvl3_lat <= MAX_C3_LATENCY) {
-			acpi_c3_exit_latency
-				= ACPI_MICROSEC_TO_TMR_TICKS(acpi_fadt.plvl3_lat);
-			acpi_c3_enter_latency
-				= ACPI_MICROSEC_TO_TMR_TICKS(acpi_fadt.plvl3_lat * 12);
-			acpi_max_c_state = 3;
-
-			printk(" C3");
-		}
-
-		printk("\n");
-	}
-
-	printk(KERN_INFO "ACPI: plvl2lat=%d plvl3lat=%d\n", acpi_fadt.plvl2_lat, acpi_fadt.plvl3_lat);
-	printk(KERN_INFO "ACPI: C2 enter=%d C2 exit=%d\n", acpi_c2_enter_latency, acpi_c2_exit_latency);
-	printk(KERN_INFO "ACPI: C3 enter=%d C3 exit=%d\n", acpi_c3_enter_latency, acpi_c3_exit_latency);
-
-	return AE_OK;
-}
-
-static int
-acpi_pm_timer_init(void)
-{
-	FADT_DESCRIPTOR *fadt = &acpi_fadt;
-
-	if (fadt->tmr_val_ext) {
-		acpi_pm_tmr_len = 32;
-	} else {
-		acpi_pm_tmr_len = 24;
-	}
-
-	DEBUG_PRINT(ACPI_INFO, ("PM Timer width: %d bits\n", acpi_pm_tmr_len));
-
-	return AE_OK;
-}
-
-int
-acpi_cpu_init(void)
-{
-	acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
-			    ACPI_ROOT_OBJECT,
-			    ACPI_UINT32_MAX,
-			    acpi_found_cpu,
-			    NULL,
-			    NULL);
-
-	acpi_pm_timer_init();
-
-	if (acpi_use_idle) {
-#ifdef CONFIG_SMP
-		if (smp_num_cpus == 1)
-			pm_idle = acpi_idle;
-#else
-		pm_idle = acpi_idle;
-#endif
-		printk(KERN_INFO "ACPI: Using ACPI idle\n");
-		printk(KERN_INFO "ACPI: If experiencing system slowness, try adding \"acpi=no-idle\" to cmdline\n");
-	}
-	else {
-		printk(KERN_INFO "ACPI: Not using ACPI idle\n");
-	}
-
-	return 0;
-}