Subversion Repositories HelenOS

Rev

Rev 4153 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
3924 svoboda 1
/*
2
 * Copyright (c) 2008 Pavel Rimsky
3
 * All rights reserved.
4
 *
5
 * Redistribution and use in source and binary forms, with or without
6
 * modification, are permitted provided that the following conditions
7
 * are met:
8
 *
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
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
15
 *   derived from this software without specific prior written permission.
16
 *
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
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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
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
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
28
 
29
/** @addtogroup kbd_port
30
 * @ingroup  kbd
31
 * @{
32
 */
33
/** @file
34
 * @brief   SGCN (Serengeti Console) keyboard port driver.
35
 */
36
 
37
#include <as.h>
38
#include <ddi.h>
39
#include <async.h>
40
#include <kbd.h>
41
#include <kbd_port.h>
42
#include <sysinfo.h>
43
#include <stdio.h>
4070 rimsky 44
#include <thread.h>
4581 mejdrech 45
#include <bool.h>
3924 svoboda 46
 
4070 rimsky 47
#define POLL_INTERVAL       10000
48
 
3924 svoboda 49
/**
50
 * SGCN buffer header. It is placed at the very beginning of the SGCN
51
 * buffer.
52
 */
53
typedef struct {
54
    /** hard-wired to "CON" */
55
    char magic[4];
56
 
57
    /** we don't need this */
58
    char unused[8];
59
 
60
    /** offset within the SGCN buffer of the input buffer start */
61
    uint32_t in_begin;
62
 
63
    /** offset within the SGCN buffer of the input buffer end */
64
    uint32_t in_end;
65
 
66
    /** offset within the SGCN buffer of the input buffer read pointer */
67
    uint32_t in_rdptr;
68
 
69
    /** offset within the SGCN buffer of the input buffer write pointer */
70
    uint32_t in_wrptr;
71
} __attribute__ ((packed)) sgcn_buffer_header_t;
72
 
73
/*
74
 * Returns a pointer to the object of a given type which is placed at the given
75
 * offset from the console buffer beginning.
76
 */
77
#define SGCN_BUFFER(type, offset) \
78
        ((type *) (sram_virt_addr + sram_buffer_offset + (offset)))
79
 
80
/** Returns a pointer to the console buffer header. */
81
#define SGCN_BUFFER_HEADER  (SGCN_BUFFER(sgcn_buffer_header_t, 0))
82
 
83
/**
84
 * Virtual address mapped to SRAM.
85
 */
86
static uintptr_t sram_virt_addr;
87
 
88
/**
89
 * SGCN buffer offset within SGCN.
90
 */
91
static uintptr_t sram_buffer_offset;
92
 
4070 rimsky 93
/* polling thread */
94
static void *sgcn_thread_impl(void *arg);
3924 svoboda 95
 
4581 mejdrech 96
static volatile bool polling_disabled = false;
3924 svoboda 97
 
98
/**
99
 * Initializes the SGCN driver.
4070 rimsky 100
 * Maps the physical memory (SRAM) and creates the polling thread.
3924 svoboda 101
 */
102
int kbd_port_init(void)
103
{
104
    sram_virt_addr = (uintptr_t) as_get_mappable_page(sysinfo_value("sram.area.size"));
105
    if (physmem_map((void *) sysinfo_value("sram.address.physical"),
106
        (void *) sram_virt_addr, sysinfo_value("sram.area.size") / PAGE_SIZE,
107
        AS_AREA_READ | AS_AREA_WRITE) != 0) {
108
        printf("SGCN: uspace driver could not map physical memory.");
109
        return -1;
110
    }
111
 
112
    sram_buffer_offset = sysinfo_value("sram.buffer.offset");
4070 rimsky 113
 
114
    thread_id_t tid;
115
    int rc;
116
 
117
    rc = thread_create(sgcn_thread_impl, NULL, "kbd_poll", &tid);
118
    if (rc != 0) {
119
        return rc;
120
    }
121
 
3924 svoboda 122
    return 0;
123
}
124
 
4581 mejdrech 125
void kbd_port_yield(void)
126
{
127
    polling_disabled = true;
128
}
129
 
130
void kbd_port_reclaim(void)
131
{
132
    polling_disabled = false;
133
}
134
 
3924 svoboda 135
/**
136
 * Handler of the "key pressed" event. Reads codes of all the pressed keys from
137
 * the buffer.
138
 */
4070 rimsky 139
static void sgcn_key_pressed(void)
3924 svoboda 140
{
141
    char c;
142
 
143
    uint32_t begin = SGCN_BUFFER_HEADER->in_begin;
144
    uint32_t end = SGCN_BUFFER_HEADER->in_end;
145
    uint32_t size = end - begin;
146
 
147
    volatile char *buf_ptr = (volatile char *)
148
        SGCN_BUFFER(char, SGCN_BUFFER_HEADER->in_rdptr);
149
    volatile uint32_t *in_wrptr_ptr = &(SGCN_BUFFER_HEADER->in_wrptr);
150
    volatile uint32_t *in_rdptr_ptr = &(SGCN_BUFFER_HEADER->in_rdptr);
151
 
152
    while (*in_rdptr_ptr != *in_wrptr_ptr) {
153
        c = *buf_ptr;
154
        *in_rdptr_ptr = (((*in_rdptr_ptr) - begin + 1) % size) + begin;
155
        buf_ptr = (volatile char *)
156
            SGCN_BUFFER(char, SGCN_BUFFER_HEADER->in_rdptr);
157
        kbd_push_scancode(c);
158
    }
159
}
160
 
4070 rimsky 161
/**
162
 * Thread to poll SGCN for keypresses.
163
 */
164
static void *sgcn_thread_impl(void *arg)
165
{
166
    (void) arg;
167
 
168
    while (1) {
4581 mejdrech 169
        if (polling_disabled == false)
170
            sgcn_key_pressed();
4070 rimsky 171
        usleep(POLL_INTERVAL);
172
    }
173
}
174
 
3924 svoboda 175
/** @}
176
 */