WebSVN – HelenOS – Diff – /trunk/kernel/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/cycle.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 <ddi/irq.h>
#include <ddi/device.h>
 
#define CLK_PORT1   0x40
#define CLK_PORT4   0x43
 
#define CLK_CONST   1193180
#define MAGIC_NUMBER    1194
 
static irq_t i8254_irq;
 
static irq_ownership_t i8254_claim(void)
{
    return IRQ_ACCEPT;
}
 
static void i8254_irq_handler(irq_t *irq, void *arg, ...)
{
    /*
     * This IRQ is responsible for kernel preemption.
     * Nevertheless, we are now holding a spinlock which prevents
     * preemption. For this particular IRQ, we don't need the
     * lock. We just release it, call clock() and then reacquire it again.
     */
    spinlock_unlock(&irq->lock);
    clock();
    spinlock_lock(&irq->lock);
}
 
void i8254_init(void)
{
    irq_initialize(&i8254_irq);
    i8254_irq.preack = true;
    i8254_irq.devno = device_assign_devno();
    i8254_irq.inr = IRQ_CLK;
    i8254_irq.claim = i8254_claim;
    i8254_irq.handler = i8254_irq_handler;
    irq_register(&i8254_irq);
   
    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);
}
 
#define LOOPS 150000
#define SHIFT 11
void i8254_calibrate_delay_loop(void)
{
    uint64_t clk1, clk2;
    uint32_t t1, t2, o1, o2;
    uint8_t 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 = get_cycle();
    delay(1 << SHIFT);
    clk2 = get_cycle();
   
    CPU->frequency_mhz = (clk2 - clk1) >> SHIFT;
 
    return;
}
 
/** @}
 */
 

Rev 2107	Rev 2218
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	/**
33	* @file	33	* @file
34	* @brief i8254 chip driver.	34	* @brief i8254 chip driver.
35	*	35	*
36	* Low level time functions.	36	* Low level time functions.
37	*/	37	*/
38		38
39	#include <arch/types.h>	39	#include <arch/types.h>
40	#include <time/clock.h>	40	#include <time/clock.h>
41	#include <time/delay.h>	41	#include <time/delay.h>
42	#include <arch/cycle.h>	42	#include <arch/cycle.h>
43	#include <arch/interrupt.h>	43	#include <arch/interrupt.h>
44	#include <arch/drivers/i8259.h>	44	#include <arch/drivers/i8259.h>
45	#include <arch/drivers/i8254.h>	45	#include <arch/drivers/i8254.h>
46	#include <cpu.h>	46	#include <cpu.h>
47	#include <config.h>	47	#include <config.h>
48	#include <arch/pm.h>	48	#include <arch/pm.h>
49	#include <arch/asm.h>	49	#include <arch/asm.h>
50	#include <arch/cpuid.h>	50	#include <arch/cpuid.h>
51	#include <arch.h>	51	#include <arch.h>
52	#include <time/delay.h>	52	#include <time/delay.h>
53	#include <ddi/irq.h>	53	#include <ddi/irq.h>
54	#include <ddi/device.h>	54	#include <ddi/device.h>
55		55
56	#define CLK_PORT1 0x40	56	#define CLK_PORT1 0x40
57	#define CLK_PORT4 0x43	57	#define CLK_PORT4 0x43
58		58
59	#define CLK_CONST 1193180	59	#define CLK_CONST 1193180
60	#define MAGIC_NUMBER 1194	60	#define MAGIC_NUMBER 1194
61		61
62	static irq_t i8254_irq;	62	static irq_t i8254_irq;
63		63
64	static irq_ownership_t i8254_claim(void)	64	static irq_ownership_t i8254_claim(void)
65	{	65	{
66	return IRQ_ACCEPT;	66	return IRQ_ACCEPT;
67	}	67	}
68		68
69	static void i8254_irq_handler(irq_t irq, void arg, ...)	69	static void i8254_irq_handler(irq_t irq, void arg, ...)
70	{	70	{
71	/*	71	/*
72	* This IRQ is responsible for kernel preemption.	72	* This IRQ is responsible for kernel preemption.
73	* Nevertheless, we are now holding a spinlock which prevents	73	* Nevertheless, we are now holding a spinlock which prevents
74	* preemption. For this particular IRQ, we don't need the	74	* preemption. For this particular IRQ, we don't need the
75	* lock. We just release it, call clock() and then reacquire it again.	75	* lock. We just release it, call clock() and then reacquire it again.
76	*/	76	*/
77	spinlock_unlock(&irq->lock);	77	spinlock_unlock(&irq->lock);
78	clock();	78	clock();
79	spinlock_lock(&irq->lock);	79	spinlock_lock(&irq->lock);
80	}	80	}
81		81
82	void i8254_init(void)	82	void i8254_init(void)
83	{	83	{
84	irq_initialize(&i8254_irq);	84	irq_initialize(&i8254_irq);
-		85	i8254_irq.preack = true;
85	i8254_irq.devno = device_assign_devno();	86	i8254_irq.devno = device_assign_devno();
86	i8254_irq.inr = IRQ_CLK;	87	i8254_irq.inr = IRQ_CLK;
87	i8254_irq.claim = i8254_claim;	88	i8254_irq.claim = i8254_claim;
88	i8254_irq.handler = i8254_irq_handler;	89	i8254_irq.handler = i8254_irq_handler;
89	irq_register(&i8254_irq);	90	irq_register(&i8254_irq);
90		91
91	i8254_normal_operation();	92	i8254_normal_operation();
92	}	93	}
93		94
94	void i8254_normal_operation(void)	95	void i8254_normal_operation(void)
95	{	96	{
96	outb(CLK_PORT4, 0x36);	97	outb(CLK_PORT4, 0x36);
97	pic_disable_irqs(1 << IRQ_CLK);	98	pic_disable_irqs(1 << IRQ_CLK);
98	outb(CLK_PORT1, (CLK_CONST / HZ) & 0xf);	99	outb(CLK_PORT1, (CLK_CONST / HZ) & 0xf);
99	outb(CLK_PORT1, (CLK_CONST / HZ) >> 8);	100	outb(CLK_PORT1, (CLK_CONST / HZ) >> 8);
100	pic_enable_irqs(1 << IRQ_CLK);	101	pic_enable_irqs(1 << IRQ_CLK);
101	}	102	}
102		103
103	#define LOOPS 150000	104	#define LOOPS 150000
104	#define SHIFT 11	105	#define SHIFT 11
105	void i8254_calibrate_delay_loop(void)	106	void i8254_calibrate_delay_loop(void)
106	{	107	{
107	uint64_t clk1, clk2;	108	uint64_t clk1, clk2;
108	uint32_t t1, t2, o1, o2;	109	uint32_t t1, t2, o1, o2;
109	uint8_t not_ok;	110	uint8_t not_ok;
110		111
111		112
112	/*	113	/*
113	* One-shot timer. Count-down from 0xffff at 1193180Hz	114	* One-shot timer. Count-down from 0xffff at 1193180Hz
114	* MAGIC_NUMBER is the magic value for 1ms.	115	* MAGIC_NUMBER is the magic value for 1ms.
115	*/	116	*/
116	outb(CLK_PORT4, 0x30);	117	outb(CLK_PORT4, 0x30);
117	outb(CLK_PORT1, 0xff);	118	outb(CLK_PORT1, 0xff);
118	outb(CLK_PORT1, 0xff);	119	outb(CLK_PORT1, 0xff);
119		120
120	do {	121	do {
121	/* will read both status and count */	122	/* will read both status and count */
122	outb(CLK_PORT4, 0xc2);	123	outb(CLK_PORT4, 0xc2);
123	not_ok = (inb(CLK_PORT1)>>6)&1;	124	not_ok = (inb(CLK_PORT1)>>6)&1;
124	t1 = inb(CLK_PORT1);	125	t1 = inb(CLK_PORT1);
125	t1 \|= inb(CLK_PORT1) << 8;	126	t1 \|= inb(CLK_PORT1) << 8;
126	} while (not_ok);	127	} while (not_ok);
127		128
128	asm_delay_loop(LOOPS);	129	asm_delay_loop(LOOPS);
129		130
130	outb(CLK_PORT4, 0xd2);	131	outb(CLK_PORT4, 0xd2);
131	t2 = inb(CLK_PORT1);	132	t2 = inb(CLK_PORT1);
132	t2 \|= inb(CLK_PORT1) << 8;	133	t2 \|= inb(CLK_PORT1) << 8;
133		134
134	/*	135	/*
135	* We want to determine the overhead of the calibrating mechanism.	136	* We want to determine the overhead of the calibrating mechanism.
136	*/	137	*/
137	outb(CLK_PORT4, 0xd2);	138	outb(CLK_PORT4, 0xd2);
138	o1 = inb(CLK_PORT1);	139	o1 = inb(CLK_PORT1);
139	o1 \|= inb(CLK_PORT1) << 8;	140	o1 \|= inb(CLK_PORT1) << 8;
140		141
141	asm_fake_loop(LOOPS);	142	asm_fake_loop(LOOPS);
142		143
143	outb(CLK_PORT4, 0xd2);	144	outb(CLK_PORT4, 0xd2);
144	o2 = inb(CLK_PORT1);	145	o2 = inb(CLK_PORT1);
145	o2 \|= inb(CLK_PORT1) << 8;	146	o2 \|= inb(CLK_PORT1) << 8;
146		147
147	CPU->delay_loop_const =	148	CPU->delay_loop_const =
148	((MAGIC_NUMBER * LOOPS) / 1000) / ((t1 - t2) - (o1 - o2)) +	149	((MAGIC_NUMBER * LOOPS) / 1000) / ((t1 - t2) - (o1 - o2)) +
149	(((MAGIC_NUMBER * LOOPS) / 1000) % ((t1 - t2) - (o1 - o2)) ? 1 : 0);	150	(((MAGIC_NUMBER * LOOPS) / 1000) % ((t1 - t2) - (o1 - o2)) ? 1 : 0);
150		151
151	clk1 = get_cycle();	152	clk1 = get_cycle();
152	delay(1 << SHIFT);	153	delay(1 << SHIFT);
153	clk2 = get_cycle();	154	clk2 = get_cycle();
154		155
155	CPU->frequency_mhz = (clk2 - clk1) >> SHIFT;	156	CPU->frequency_mhz = (clk2 - clk1) >> SHIFT;
156		157
157	return;	158	return;
158	}	159	}
159		160
160	/** @}	161	/** @}
161	*/	162	*/
162		163

Subversion Repositories HelenOS

(root)/trunk/kernel/arch/ia32/src/drivers/i8254.c – Rev 2107 → 2218