WebSVN – HelenOS-historic – Diff – /kernel/trunk/arch/ia32/src/drivers/i8254.c


/*
 * Copyright (C) 2001-2004 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/** @addtogroup ia32   
 * @{
 */
/**
 * @file
 * @brief   i8254 chip driver.
 *
 * Low level time functions.
 */
 
#include <arch/types.h>
#include <time/clock.h>
#include <time/delay.h>
#include <arch/interrupt.h>
#include <arch/drivers/i8259.h>
#include <arch/drivers/i8254.h>
#include <cpu.h>
#include <config.h>
#include <arch/pm.h>
#include <arch/asm.h>
#include <arch/cpuid.h>
#include <arch.h>
#include <time/delay.h>
#include <interrupt.h>
 
 
 
 
 
 
#define CLK_PORT1   0x40
#define CLK_PORT4   0x43
 
 
#define CLK_CONST   1193180
#define MAGIC_NUMBER    1194
 
static void i8254_interrupt(int n, istate_t *istate);
 
void i8254_init(void)
{
    i8254_normal_operation();
}
 
void i8254_normal_operation(void)
{
    outb(CLK_PORT4, 0x36);
    pic_disable_irqs(1<<IRQ_CLK);
    outb(CLK_PORT1, (CLK_CONST/HZ) & 0xf);
    outb(CLK_PORT1, (CLK_CONST/HZ) >> 8);
    pic_enable_irqs(1<<IRQ_CLK);
    exc_register(VECTOR_CLK, "i8254_clock", (iroutine) i8254_interrupt);
}
 
#define LOOPS 150000
#define SHIFT 11
void i8254_calibrate_delay_loop(void)
{
    __u64 clk1, clk2;
    __u32 t1, t2, o1, o2;
    __u8 not_ok;
 
 
    /*
     * One-shot timer. Count-down from 0xffff at 1193180Hz
     * MAGIC_NUMBER is the magic value for 1ms.
     */
    outb(CLK_PORT4, 0x30);
    outb(CLK_PORT1, 0xff);
    outb(CLK_PORT1, 0xff);
 
    do {
        /* will read both status and count */
        outb(CLK_PORT4, 0xc2);
        not_ok = (inb(CLK_PORT1)>>6)&1;
        t1 = inb(CLK_PORT1);
        t1 |= inb(CLK_PORT1) << 8;
    } while (not_ok);
 
    asm_delay_loop(LOOPS);
 
    outb(CLK_PORT4, 0xd2);
    t2 = inb(CLK_PORT1);
    t2 |= inb(CLK_PORT1) << 8;
 
    /*
     * We want to determine the overhead of the calibrating mechanism.
     */
    outb(CLK_PORT4, 0xd2);
    o1 = inb(CLK_PORT1);
    o1 |= inb(CLK_PORT1) << 8;
 
    asm_fake_loop(LOOPS);
 
    outb(CLK_PORT4, 0xd2);
    o2 = inb(CLK_PORT1);
    o2 |= inb(CLK_PORT1) << 8;
 
    CPU->delay_loop_const = ((MAGIC_NUMBER*LOOPS)/1000) / ((t1-t2)-(o1-o2)) + (((MAGIC_NUMBER*LOOPS)/1000) % ((t1-t2)-(o1-o2)) ? 1 : 0);
 
    clk1 = rdtsc();
    delay(1<<SHIFT);
    clk2 = rdtsc();
   
    CPU->frequency_mhz = (clk2-clk1)>>SHIFT;
 
    return;
}
 
void i8254_interrupt(int n, istate_t *istate)
{
    trap_virtual_eoi();
    clock();
}
 
/** @}
 */
 
 

Rev 1702	Rev 1754
1	/*	1	/*
2	* Copyright (C) 2001-2004 Jakub Jermar	2	* Copyright (C) 2001-2004 Jakub Jermar
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	/** @addtogroup ia32	29	/** @addtogroup ia32
30	* @{	30	* @{
31	*/	31	*/
-		32	/**
32	/** @file	33	* @file
-		34	* @brief i8254 chip driver.
-		35	*
-		36	* Low level time functions.
33	*/	37	*/
34		38
35	#include <arch/types.h>	39	#include <arch/types.h>
36	#include <time/clock.h>	40	#include <time/clock.h>
37	#include <time/delay.h>	41	#include <time/delay.h>
38	#include <arch/interrupt.h>	42	#include <arch/interrupt.h>
39	#include <arch/drivers/i8259.h>	43	#include <arch/drivers/i8259.h>
40	#include <arch/drivers/i8254.h>	44	#include <arch/drivers/i8254.h>
41	#include <cpu.h>	45	#include <cpu.h>
42	#include <config.h>	46	#include <config.h>
43	#include <arch/pm.h>	47	#include <arch/pm.h>
44	#include <arch/asm.h>	48	#include <arch/asm.h>
45	#include <arch/cpuid.h>	49	#include <arch/cpuid.h>
46	#include <arch.h>	50	#include <arch.h>
47	#include <time/delay.h>	51	#include <time/delay.h>
48	#include <interrupt.h>	52	#include <interrupt.h>
49		53
50	/*	-
51	* i8254 chip driver.	-
52	* Low level time functions.	-
53	*/	-
54		-
55	#define CLK_PORT1 0x40	54	#define CLK_PORT1 0x40
56	#define CLK_PORT4 0x43	55	#define CLK_PORT4 0x43
57		56
58		-
59	#define CLK_CONST 1193180	57	#define CLK_CONST 1193180
60	#define MAGIC_NUMBER 1194	58	#define MAGIC_NUMBER 1194
61		59
62	static void i8254_interrupt(int n, istate_t *istate);	60	static void i8254_interrupt(int n, istate_t *istate);
63		61
64	void i8254_init(void)	62	void i8254_init(void)
65	{	63	{
66	i8254_normal_operation();	64	i8254_normal_operation();
67	}	65	}
68		66
69	void i8254_normal_operation(void)	67	void i8254_normal_operation(void)
70	{	68	{
71	outb(CLK_PORT4, 0x36);	69	outb(CLK_PORT4, 0x36);
72	pic_disable_irqs(1<<IRQ_CLK);	70	pic_disable_irqs(1<<IRQ_CLK);
73	outb(CLK_PORT1, (CLK_CONST/HZ) & 0xf);	71	outb(CLK_PORT1, (CLK_CONST/HZ) & 0xf);
74	outb(CLK_PORT1, (CLK_CONST/HZ) >> 8);	72	outb(CLK_PORT1, (CLK_CONST/HZ) >> 8);
75	pic_enable_irqs(1<<IRQ_CLK);	73	pic_enable_irqs(1<<IRQ_CLK);
76	exc_register(VECTOR_CLK, "i8254_clock", (iroutine) i8254_interrupt);	74	exc_register(VECTOR_CLK, "i8254_clock", (iroutine) i8254_interrupt);
77	}	75	}
78		76
79	#define LOOPS 150000	77	#define LOOPS 150000
80	#define SHIFT 11	78	#define SHIFT 11
81	void i8254_calibrate_delay_loop(void)	79	void i8254_calibrate_delay_loop(void)
82	{	80	{
83	__u64 clk1, clk2;	81	__u64 clk1, clk2;
84	__u32 t1, t2, o1, o2;	82	__u32 t1, t2, o1, o2;
85	__u8 not_ok;	83	__u8 not_ok;
86		84
87		85
88	/*	86	/*
89	* One-shot timer. Count-down from 0xffff at 1193180Hz	87	* One-shot timer. Count-down from 0xffff at 1193180Hz
90	* MAGIC_NUMBER is the magic value for 1ms.	88	* MAGIC_NUMBER is the magic value for 1ms.
91	*/	89	*/
92	outb(CLK_PORT4, 0x30);	90	outb(CLK_PORT4, 0x30);
93	outb(CLK_PORT1, 0xff);	91	outb(CLK_PORT1, 0xff);
94	outb(CLK_PORT1, 0xff);	92	outb(CLK_PORT1, 0xff);
95		93
96	do {	94	do {
97	/* will read both status and count */	95	/* will read both status and count */
98	outb(CLK_PORT4, 0xc2);	96	outb(CLK_PORT4, 0xc2);
99	not_ok = (inb(CLK_PORT1)>>6)&1;	97	not_ok = (inb(CLK_PORT1)>>6)&1;
100	t1 = inb(CLK_PORT1);	98	t1 = inb(CLK_PORT1);
101	t1 \|= inb(CLK_PORT1) << 8;	99	t1 \|= inb(CLK_PORT1) << 8;
102	} while (not_ok);	100	} while (not_ok);
103		101
104	asm_delay_loop(LOOPS);	102	asm_delay_loop(LOOPS);
105		103
106	outb(CLK_PORT4, 0xd2);	104	outb(CLK_PORT4, 0xd2);
107	t2 = inb(CLK_PORT1);	105	t2 = inb(CLK_PORT1);
108	t2 \|= inb(CLK_PORT1) << 8;	106	t2 \|= inb(CLK_PORT1) << 8;
109		107
110	/*	108	/*
111	* We want to determine the overhead of the calibrating mechanism.	109	* We want to determine the overhead of the calibrating mechanism.
112	*/	110	*/
113	outb(CLK_PORT4, 0xd2);	111	outb(CLK_PORT4, 0xd2);
114	o1 = inb(CLK_PORT1);	112	o1 = inb(CLK_PORT1);
115	o1 \|= inb(CLK_PORT1) << 8;	113	o1 \|= inb(CLK_PORT1) << 8;
116		114
117	asm_fake_loop(LOOPS);	115	asm_fake_loop(LOOPS);
118		116
119	outb(CLK_PORT4, 0xd2);	117	outb(CLK_PORT4, 0xd2);
120	o2 = inb(CLK_PORT1);	118	o2 = inb(CLK_PORT1);
121	o2 \|= inb(CLK_PORT1) << 8;	119	o2 \|= inb(CLK_PORT1) << 8;
122		120
123	CPU->delay_loop_const = ((MAGIC_NUMBERLOOPS)/1000) / ((t1-t2)-(o1-o2)) + (((MAGIC_NUMBERLOOPS)/1000) % ((t1-t2)-(o1-o2)) ? 1 : 0);	121	CPU->delay_loop_const = ((MAGIC_NUMBERLOOPS)/1000) / ((t1-t2)-(o1-o2)) + (((MAGIC_NUMBERLOOPS)/1000) % ((t1-t2)-(o1-o2)) ? 1 : 0);
124		122
125	clk1 = rdtsc();	123	clk1 = rdtsc();
126	delay(1<<SHIFT);	124	delay(1<<SHIFT);
127	clk2 = rdtsc();	125	clk2 = rdtsc();
128		126
129	CPU->frequency_mhz = (clk2-clk1)>>SHIFT;	127	CPU->frequency_mhz = (clk2-clk1)>>SHIFT;
130		128
131	return;	129	return;
132	}	130	}
133		131
134	void i8254_interrupt(int n, istate_t *istate)	132	void i8254_interrupt(int n, istate_t *istate)
135	{	133	{
136	trap_virtual_eoi();	134	trap_virtual_eoi();
137	clock();	135	clock();
138	}	136	}
139		137
140	/** @}	138	/** @}
141	*/	139	*/
142		-
143		140

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/arch/ia32/src/drivers/i8254.c – Rev 1702 → 1754