WebSVN – HelenOS – Diff – /branches/network/kernel/genarch/src/drivers/i8042/i8042.c


/*
 * Copyright (c) 2009 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 genarch
 * @{
 */
/**
 * @file
 * @brief i8042 processor driver
 *
 * It takes care of the i8042 serial communication.
 *
 */
 
#include <genarch/drivers/i8042/i8042.h>
#include <genarch/drivers/legacy/ia32/io.h>
#include <arch/asm.h>
#include <console/chardev.h>
#include <mm/slab.h>
#include <ddi/device.h>
 
static indev_operations_t kbrdin_ops = {
    .poll = NULL
};
 
#define i8042_SET_COMMAND  0x60
#define i8042_COMMAND      0x69
#define i8042_CPU_RESET    0xfe
 
#define i8042_BUFFER_FULL_MASK  0x01
#define i8042_WAIT_MASK         0x02
 
static irq_ownership_t i8042_claim(irq_t *irq)
{
    i8042_instance_t *i8042_instance = irq->instance;
    i8042_t *dev = i8042_instance->i8042;
   
    if (pio_read_8(&dev->status) & i8042_BUFFER_FULL_MASK)
        return IRQ_ACCEPT;
    else
        return IRQ_DECLINE;
}
 
static void i8042_irq_handler(irq_t *irq)
{
    i8042_instance_t *instance = irq->instance;
    i8042_t *dev = instance->i8042;
    uint8_t status;
   
    if (((status = pio_read_8(&dev->status)) & i8042_BUFFER_FULL_MASK)) {
        uint8_t data = pio_read_8(&dev->data);
        indev_push_character(&instance->kbrdin, data);
    }
}
 
/** Initialize i8042. */
indev_t *i8042_init(i8042_t *dev, inr_t inr)
{
    i8042_instance_t *instance
        = malloc(sizeof(i8042_instance_t), FRAME_ATOMIC);
    if (!instance)
        return NULL;
   
    indev_initialize("i8042", &instance->kbrdin, &kbrdin_ops);
   
    instance->i8042 = dev;
   
    irq_initialize(&instance->irq);
    instance->irq.devno = device_assign_devno();
    instance->irq.inr = inr;
    instance->irq.claim = i8042_claim;
    instance->irq.handler = i8042_irq_handler;
    instance->irq.instance = instance;
    irq_register(&instance->irq);
   
 
    /* Clear input buffer */
 
    while (pio_read_8(&dev->status) & i8042_BUFFER_FULL_MASK)
        (void) pio_read_8(&dev->data);
   
    return &instance->kbrdin;
}
 
/* Reset CPU by pulsing pin 0 */
void i8042_cpu_reset(i8042_t *dev)
{
    interrupts_disable();
   
    /* Clear input buffer */
    while (pio_read_8(&dev->status) & i8042_BUFFER_FULL_MASK)
        (void) pio_read_8(&dev->data);
   
    /* Reset CPU */
    pio_write_8(&dev->status, i8042_CPU_RESET);
}
 
/** @}
 */
 

Rev 4153	Rev 4263
1	/*	1	/*
2	* Copyright (c) 2009 Jakub Jermar	2	* Copyright (c) 2009 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 genarch	29	/** @addtogroup genarch
30	* @{	30	* @{
31	*/	31	*/
32	/**	32	/**
33	* @file	33	* @file
34	* @brief i8042 processor driver	34	* @brief i8042 processor driver
35	*	35	*
36	* It takes care of the i8042 serial communication.	36	* It takes care of the i8042 serial communication.
-		37	*
37	*/	38	*/
38		39
39	#include <genarch/drivers/i8042/i8042.h>	40	#include <genarch/drivers/i8042/i8042.h>
40	#include <genarch/drivers/legacy/ia32/io.h>	41	#include <genarch/drivers/legacy/ia32/io.h>
41	#include <arch/asm.h>	42	#include <arch/asm.h>
42	#include <console/chardev.h>	43	#include <console/chardev.h>
43	#include <mm/slab.h>	44	#include <mm/slab.h>
44	#include <ddi/device.h>	45	#include <ddi/device.h>
45		46
46	static indev_operations_t kbrdin_ops = {	47	static indev_operations_t kbrdin_ops = {
47	.poll = NULL	48	.poll = NULL
48	};	49	};
49		50
50	#define i8042_SET_COMMAND 0x60	51	#define i8042_SET_COMMAND 0x60
51	#define i8042_COMMAND 0x69	52	#define i8042_COMMAND 0x69
-		53	#define i8042_CPU_RESET 0xfe
52		54
53	#define i8042_BUFFER_FULL_MASK 0x01	55	#define i8042_BUFFER_FULL_MASK 0x01
54	#define i8042_WAIT_MASK 0x02	56	#define i8042_WAIT_MASK 0x02
55		57
56	static irq_ownership_t i8042_claim(irq_t *irq)	58	static irq_ownership_t i8042_claim(irq_t *irq)
57	{	59	{
58	i8042_instance_t *i8042_instance = irq->instance;	60	i8042_instance_t *i8042_instance = irq->instance;
59	i8042_t *dev = i8042_instance->i8042;	61	i8042_t *dev = i8042_instance->i8042;
60		62
61	if (pio_read_8(&dev->status) & i8042_BUFFER_FULL_MASK)	63	if (pio_read_8(&dev->status) & i8042_BUFFER_FULL_MASK)
62	return IRQ_ACCEPT;	64	return IRQ_ACCEPT;
63	else	65	else
64	return IRQ_DECLINE;	66	return IRQ_DECLINE;
65	}	67	}
66		68
67	static void i8042_irq_handler(irq_t *irq)	69	static void i8042_irq_handler(irq_t *irq)
68	{	70	{
69	i8042_instance_t *instance = irq->instance;	71	i8042_instance_t *instance = irq->instance;
70	i8042_t *dev = instance->i8042;	72	i8042_t *dev = instance->i8042;
71	uint8_t status;	73	uint8_t status;
72		74
73	if (((status = pio_read_8(&dev->status)) & i8042_BUFFER_FULL_MASK)) {	75	if (((status = pio_read_8(&dev->status)) & i8042_BUFFER_FULL_MASK)) {
74	uint8_t data = pio_read_8(&dev->data);	76	uint8_t data = pio_read_8(&dev->data);
75	indev_push_character(&instance->kbrdin, data);	77	indev_push_character(&instance->kbrdin, data);
76	}	78	}
77	}	79	}
78		80
79	/** Initialize i8042. */	81	/** Initialize i8042. */
80	indev_t i8042_init(i8042_t dev, inr_t inr)	82	indev_t i8042_init(i8042_t dev, inr_t inr)
81	{	83	{
82	i8042_instance_t *instance	84	i8042_instance_t *instance
83	= malloc(sizeof(i8042_instance_t), FRAME_ATOMIC);	85	= malloc(sizeof(i8042_instance_t), FRAME_ATOMIC);
84	if (!instance)	86	if (!instance)
85	return NULL;	87	return NULL;
86		88
87	indev_initialize("i8042", &instance->kbrdin, &kbrdin_ops);	89	indev_initialize("i8042", &instance->kbrdin, &kbrdin_ops);
88		90
89	instance->i8042 = dev;	91	instance->i8042 = dev;
90		92
91	irq_initialize(&instance->irq);	93	irq_initialize(&instance->irq);
92	instance->irq.devno = device_assign_devno();	94	instance->irq.devno = device_assign_devno();
93	instance->irq.inr = inr;	95	instance->irq.inr = inr;
94	instance->irq.claim = i8042_claim;	96	instance->irq.claim = i8042_claim;
95	instance->irq.handler = i8042_irq_handler;	97	instance->irq.handler = i8042_irq_handler;
96	instance->irq.instance = instance;	98	instance->irq.instance = instance;
97	irq_register(&instance->irq);	99	irq_register(&instance->irq);
98		100
99	/*	-
100	* Clear input buffer.	101	/* Clear input buffer */
101	*/	-
102	while (pio_read_8(&dev->status) & i8042_BUFFER_FULL_MASK)	102	while (pio_read_8(&dev->status) & i8042_BUFFER_FULL_MASK)
103	(void) pio_read_8(&dev->data);	103	(void) pio_read_8(&dev->data);
104		104
105	return &instance->kbrdin;	105	return &instance->kbrdin;
106	}	106	}
-		107
-		108	/* Reset CPU by pulsing pin 0 */
-		109	void i8042_cpu_reset(i8042_t *dev)
-		110	{
-		111	interrupts_disable();
-		112
-		113	/* Clear input buffer */
-		114	while (pio_read_8(&dev->status) & i8042_BUFFER_FULL_MASK)
-		115	(void) pio_read_8(&dev->data);
-		116
-		117	/* Reset CPU */
-		118	pio_write_8(&dev->status, i8042_CPU_RESET);
-		119	}
107		120
108	/** @}	121	/** @}
109	*/	122	*/
110		123

Subversion Repositories HelenOS

(root)/branches/network/kernel/genarch/src/drivers/i8042/i8042.c – Rev 4153 → 4263