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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 | ||
40 | #include <genarch/drivers/i8042/i8042.h> |
40 | #include <genarch/drivers/i8042/i8042.h> |
41 | #include <genarch/drivers/legacy/ia32/io.h> |
41 | #include <genarch/drivers/legacy/ia32/io.h> |
42 | #include <arch/asm.h> |
42 | #include <arch/asm.h> |
43 | #include <console/chardev.h> |
43 | #include <console/chardev.h> |
44 | #include <mm/slab.h> |
44 | #include <mm/slab.h> |
45 | #include <ddi/device.h> |
45 | #include <ddi/device.h> |
46 | 46 | ||
47 | static indev_operations_t kbrdin_ops = { |
47 | static indev_operations_t kbrdin_ops = { |
48 | .poll = NULL |
48 | .poll = NULL |
49 | }; |
49 | }; |
50 | 50 | ||
51 | #define i8042_SET_COMMAND 0x60 |
51 | #define i8042_SET_COMMAND 0x60 |
52 | #define i8042_COMMAND 0x69 |
52 | #define i8042_COMMAND 0x69 |
- | 53 | #define i8042_CPU_RESET 0xfe |
|
53 | 54 | ||
54 | #define i8042_BUFFER_FULL_MASK 0x01 |
55 | #define i8042_BUFFER_FULL_MASK 0x01 |
55 | #define i8042_WAIT_MASK 0x02 |
56 | #define i8042_WAIT_MASK 0x02 |
56 | 57 | ||
57 | static irq_ownership_t i8042_claim(irq_t *irq) |
58 | static irq_ownership_t i8042_claim(irq_t *irq) |
58 | { |
59 | { |
59 | i8042_instance_t *i8042_instance = irq->instance; |
60 | i8042_instance_t *i8042_instance = irq->instance; |
60 | i8042_t *dev = i8042_instance->i8042; |
61 | i8042_t *dev = i8042_instance->i8042; |
61 | 62 | ||
62 | if (pio_read_8(&dev->status) & i8042_BUFFER_FULL_MASK) |
63 | if (pio_read_8(&dev->status) & i8042_BUFFER_FULL_MASK) |
63 | return IRQ_ACCEPT; |
64 | return IRQ_ACCEPT; |
64 | else |
65 | else |
65 | return IRQ_DECLINE; |
66 | return IRQ_DECLINE; |
66 | } |
67 | } |
67 | 68 | ||
68 | static void i8042_irq_handler(irq_t *irq) |
69 | static void i8042_irq_handler(irq_t *irq) |
69 | { |
70 | { |
70 | i8042_instance_t *instance = irq->instance; |
71 | i8042_instance_t *instance = irq->instance; |
71 | i8042_t *dev = instance->i8042; |
72 | i8042_t *dev = instance->i8042; |
72 | uint8_t status; |
73 | uint8_t status; |
73 | 74 | ||
74 | if (((status = pio_read_8(&dev->status)) & i8042_BUFFER_FULL_MASK)) { |
75 | if (((status = pio_read_8(&dev->status)) & i8042_BUFFER_FULL_MASK)) { |
75 | uint8_t data = pio_read_8(&dev->data); |
76 | uint8_t data = pio_read_8(&dev->data); |
76 | indev_push_character(&instance->kbrdin, data); |
77 | indev_push_character(&instance->kbrdin, data); |
77 | } |
78 | } |
78 | } |
79 | } |
79 | 80 | ||
80 | /** Initialize i8042. */ |
81 | /** Initialize i8042. */ |
81 | indev_t *i8042_init(i8042_t *dev, inr_t inr) |
82 | indev_t *i8042_init(i8042_t *dev, inr_t inr) |
82 | { |
83 | { |
83 | i8042_instance_t *instance |
84 | i8042_instance_t *instance |
84 | = malloc(sizeof(i8042_instance_t), FRAME_ATOMIC); |
85 | = malloc(sizeof(i8042_instance_t), FRAME_ATOMIC); |
85 | if (!instance) |
86 | if (!instance) |
86 | return NULL; |
87 | return NULL; |
87 | 88 | ||
88 | indev_initialize("i8042", &instance->kbrdin, &kbrdin_ops); |
89 | indev_initialize("i8042", &instance->kbrdin, &kbrdin_ops); |
89 | 90 | ||
90 | instance->i8042 = dev; |
91 | instance->i8042 = dev; |
91 | 92 | ||
92 | irq_initialize(&instance->irq); |
93 | irq_initialize(&instance->irq); |
93 | instance->irq.devno = device_assign_devno(); |
94 | instance->irq.devno = device_assign_devno(); |
94 | instance->irq.inr = inr; |
95 | instance->irq.inr = inr; |
95 | instance->irq.claim = i8042_claim; |
96 | instance->irq.claim = i8042_claim; |
96 | instance->irq.handler = i8042_irq_handler; |
97 | instance->irq.handler = i8042_irq_handler; |
97 | instance->irq.instance = instance; |
98 | instance->irq.instance = instance; |
98 | irq_register(&instance->irq); |
99 | irq_register(&instance->irq); |
99 | 100 | ||
100 | /* |
- | |
101 | * Clear input buffer. |
101 | /* Clear input buffer */ |
102 | */ |
- | |
103 | while (pio_read_8(&dev->status) & i8042_BUFFER_FULL_MASK) |
102 | while (pio_read_8(&dev->status) & i8042_BUFFER_FULL_MASK) |
104 | (void) pio_read_8(&dev->data); |
103 | (void) pio_read_8(&dev->data); |
105 | 104 | ||
106 | return &instance->kbrdin; |
105 | return &instance->kbrdin; |
107 | } |
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 | } |
|
108 | 120 | ||
109 | /** @} |
121 | /** @} |
110 | */ |
122 | */ |
111 | 123 |