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
 */
 
#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>
 
/*
 * i8254 chip driver.
 * Low level time functions.
 */
 
#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 1477	Rev 1702
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
-		30	* @{
-		31	*/
-		32	/** @file
-		33	*/
-		34
29	#include <arch/types.h>	35	#include <arch/types.h>
30	#include <time/clock.h>	36	#include <time/clock.h>
31	#include <time/delay.h>	37	#include <time/delay.h>
32	#include <arch/interrupt.h>	38	#include <arch/interrupt.h>
33	#include <arch/drivers/i8259.h>	39	#include <arch/drivers/i8259.h>
34	#include <arch/drivers/i8254.h>	40	#include <arch/drivers/i8254.h>
35	#include <cpu.h>	41	#include <cpu.h>
36	#include <config.h>	42	#include <config.h>
37	#include <arch/pm.h>	43	#include <arch/pm.h>
38	#include <arch/asm.h>	44	#include <arch/asm.h>
39	#include <arch/cpuid.h>	45	#include <arch/cpuid.h>
40	#include <arch.h>	46	#include <arch.h>
41	#include <time/delay.h>	47	#include <time/delay.h>
42	#include <interrupt.h>	48	#include <interrupt.h>
43		49
44	/*	50	/*
45	* i8254 chip driver.	51	* i8254 chip driver.
46	* Low level time functions.	52	* Low level time functions.
47	*/	53	*/
48		54
49	#define CLK_PORT1 0x40	55	#define CLK_PORT1 0x40
50	#define CLK_PORT4 0x43	56	#define CLK_PORT4 0x43
51		57
52		58
53	#define CLK_CONST 1193180	59	#define CLK_CONST 1193180
54	#define MAGIC_NUMBER 1194	60	#define MAGIC_NUMBER 1194
55		61
56	static void i8254_interrupt(int n, istate_t *istate);	62	static void i8254_interrupt(int n, istate_t *istate);
57		63
58	void i8254_init(void)	64	void i8254_init(void)
59	{	65	{
60	i8254_normal_operation();	66	i8254_normal_operation();
61	}	67	}
62		68
63	void i8254_normal_operation(void)	69	void i8254_normal_operation(void)
64	{	70	{
65	outb(CLK_PORT4, 0x36);	71	outb(CLK_PORT4, 0x36);
66	pic_disable_irqs(1<<IRQ_CLK);	72	pic_disable_irqs(1<<IRQ_CLK);
67	outb(CLK_PORT1, (CLK_CONST/HZ) & 0xf);	73	outb(CLK_PORT1, (CLK_CONST/HZ) & 0xf);
68	outb(CLK_PORT1, (CLK_CONST/HZ) >> 8);	74	outb(CLK_PORT1, (CLK_CONST/HZ) >> 8);
69	pic_enable_irqs(1<<IRQ_CLK);	75	pic_enable_irqs(1<<IRQ_CLK);
70	exc_register(VECTOR_CLK, "i8254_clock", (iroutine) i8254_interrupt);	76	exc_register(VECTOR_CLK, "i8254_clock", (iroutine) i8254_interrupt);
71	}	77	}
72		78
73	#define LOOPS 150000	79	#define LOOPS 150000
74	#define SHIFT 11	80	#define SHIFT 11
75	void i8254_calibrate_delay_loop(void)	81	void i8254_calibrate_delay_loop(void)
76	{	82	{
77	__u64 clk1, clk2;	83	__u64 clk1, clk2;
78	__u32 t1, t2, o1, o2;	84	__u32 t1, t2, o1, o2;
79	__u8 not_ok;	85	__u8 not_ok;
80		86
81		87
82	/*	88	/*
83	* One-shot timer. Count-down from 0xffff at 1193180Hz	89	* One-shot timer. Count-down from 0xffff at 1193180Hz
84	* MAGIC_NUMBER is the magic value for 1ms.	90	* MAGIC_NUMBER is the magic value for 1ms.
85	*/	91	*/
86	outb(CLK_PORT4, 0x30);	92	outb(CLK_PORT4, 0x30);
87	outb(CLK_PORT1, 0xff);	93	outb(CLK_PORT1, 0xff);
88	outb(CLK_PORT1, 0xff);	94	outb(CLK_PORT1, 0xff);
89		95
90	do {	96	do {
91	/* will read both status and count */	97	/* will read both status and count */
92	outb(CLK_PORT4, 0xc2);	98	outb(CLK_PORT4, 0xc2);
93	not_ok = (inb(CLK_PORT1)>>6)&1;	99	not_ok = (inb(CLK_PORT1)>>6)&1;
94	t1 = inb(CLK_PORT1);	100	t1 = inb(CLK_PORT1);
95	t1 \|= inb(CLK_PORT1) << 8;	101	t1 \|= inb(CLK_PORT1) << 8;
96	} while (not_ok);	102	} while (not_ok);
97		103
98	asm_delay_loop(LOOPS);	104	asm_delay_loop(LOOPS);
99		105
100	outb(CLK_PORT4, 0xd2);	106	outb(CLK_PORT4, 0xd2);
101	t2 = inb(CLK_PORT1);	107	t2 = inb(CLK_PORT1);
102	t2 \|= inb(CLK_PORT1) << 8;	108	t2 \|= inb(CLK_PORT1) << 8;
103		109
104	/*	110	/*
105	* We want to determine the overhead of the calibrating mechanism.	111	* We want to determine the overhead of the calibrating mechanism.
106	*/	112	*/
107	outb(CLK_PORT4, 0xd2);	113	outb(CLK_PORT4, 0xd2);
108	o1 = inb(CLK_PORT1);	114	o1 = inb(CLK_PORT1);
109	o1 \|= inb(CLK_PORT1) << 8;	115	o1 \|= inb(CLK_PORT1) << 8;
110		116
111	asm_fake_loop(LOOPS);	117	asm_fake_loop(LOOPS);
112		118
113	outb(CLK_PORT4, 0xd2);	119	outb(CLK_PORT4, 0xd2);
114	o2 = inb(CLK_PORT1);	120	o2 = inb(CLK_PORT1);
115	o2 \|= inb(CLK_PORT1) << 8;	121	o2 \|= inb(CLK_PORT1) << 8;
116		122
117	CPU->delay_loop_const = ((MAGIC_NUMBERLOOPS)/1000) / ((t1-t2)-(o1-o2)) + (((MAGIC_NUMBERLOOPS)/1000) % ((t1-t2)-(o1-o2)) ? 1 : 0);	123	CPU->delay_loop_const = ((MAGIC_NUMBERLOOPS)/1000) / ((t1-t2)-(o1-o2)) + (((MAGIC_NUMBERLOOPS)/1000) % ((t1-t2)-(o1-o2)) ? 1 : 0);
118		124
119	clk1 = rdtsc();	125	clk1 = rdtsc();
120	delay(1<<SHIFT);	126	delay(1<<SHIFT);
121	clk2 = rdtsc();	127	clk2 = rdtsc();
122		128
123	CPU->frequency_mhz = (clk2-clk1)>>SHIFT;	129	CPU->frequency_mhz = (clk2-clk1)>>SHIFT;
124		130
125	return;	131	return;
126	}	132	}
127		133
128	void i8254_interrupt(int n, istate_t *istate)	134	void i8254_interrupt(int n, istate_t *istate)
129	{	135	{
130	trap_virtual_eoi();	136	trap_virtual_eoi();
131	clock();	137	clock();
132	}	138	}
-		139
-		140	/** @}
-		141	*/
-		142
133		143

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/arch/ia32/src/drivers/i8254.c – Rev 1477 → 1702