source: mainline/uspace/srv/hw/char/i8042/i8042.c@ 529edc66

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 529edc66 was ffa2c8ef, checked in by Martin Decky <martin@…>, 15 years ago

do not intermix low-level IPC methods with async framework methods
  • Property mode set to 100644
File size: 7.4 KB
Line 
1/*
2 * Copyright (c) 2001-2004 Jakub Jermar
3 * Copyright (c) 2006 Josef Cejka
4 * Copyright (c) 2009 Jiri Svoboda
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * - Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * - Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * - The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31/** @addtogroup kbd_port
32 * @ingroup kbd
33 * @{
34 */
35/** @file
36 * @brief i8042 PS/2 port driver.
37 */
38
39#include <ddi.h>
40#include <libarch/ddi.h>
41#include <devmap.h>
42#include <async.h>
43#include <unistd.h>
44#include <sysinfo.h>
45#include <stdio.h>
46#include <errno.h>
47#include <inttypes.h>
48
49#include "i8042.h"
50
51#define NAME "i8042"
52#define NAMESPACE "char"
53
54/* Interesting bits for status register */
55#define i8042_OUTPUT_FULL 0x01
56#define i8042_INPUT_FULL 0x02
57#define i8042_AUX_DATA 0x20
58
59/* Command constants */
60#define i8042_CMD_WRITE_CMDB 0x60 /**< write command byte */
61#define i8042_CMD_WRITE_AUX 0xd4 /**< write aux device */
62
63/* Command byte fields */
64#define i8042_KBD_IE 0x01
65#define i8042_AUX_IE 0x02
66#define i8042_KBD_DISABLE 0x10
67#define i8042_AUX_DISABLE 0x20
68#define i8042_KBD_TRANSLATE 0x40
69
70
71enum {
72 DEVID_PRI = 0, /**< primary device */
73 DEVID_AUX = 1, /**< AUX device */
74 MAX_DEVS = 2
75};
76
77static irq_cmd_t i8042_cmds[] = {
78 {
79 .cmd = CMD_PIO_READ_8,
80 .addr = NULL, /* will be patched in run-time */
81 .dstarg = 1
82 },
83 {
84 .cmd = CMD_BTEST,
85 .value = i8042_OUTPUT_FULL,
86 .srcarg = 1,
87 .dstarg = 3
88 },
89 {
90 .cmd = CMD_PREDICATE,
91 .value = 2,
92 .srcarg = 3
93 },
94 {
95 .cmd = CMD_PIO_READ_8,
96 .addr = NULL, /* will be patched in run-time */
97 .dstarg = 2
98 },
99 {
100 .cmd = CMD_ACCEPT
101 }
102};
103
104static irq_code_t i8042_kbd = {
105 sizeof(i8042_cmds) / sizeof(irq_cmd_t),
106 i8042_cmds
107};
108
109static uintptr_t i8042_physical;
110static uintptr_t i8042_kernel;
111static i8042_t * i8042;
112
113static i8042_port_t i8042_port[MAX_DEVS];
114
115static void wait_ready(void)
116{
117 while (pio_read_8(&i8042->status) & i8042_INPUT_FULL);
118}
119
120static void i8042_irq_handler(ipc_callid_t iid, ipc_call_t *call);
121static void i8042_connection(ipc_callid_t iid, ipc_call_t *icall);
122static int i8042_init(void);
123static void i8042_port_write(int devid, uint8_t data);
124
125
126int main(int argc, char *argv[])
127{
128 char name[16];
129 int i, rc;
130 char dchar[MAX_DEVS] = { 'a', 'b' };
131
132 printf(NAME ": i8042 PS/2 port driver\n");
133
134 rc = devmap_driver_register(NAME, i8042_connection);
135 if (rc < 0) {
136 printf(NAME ": Unable to register driver.\n");
137 return rc;
138 }
139
140 if (i8042_init() != EOK)
141 return -1;
142
143 for (i = 0; i < MAX_DEVS; i++) {
144 i8042_port[i].client_phone = -1;
145
146 snprintf(name, 16, "%s/ps2%c", NAMESPACE, dchar[i]);
147 rc = devmap_device_register(name, &i8042_port[i].devmap_handle);
148 if (rc != EOK) {
149 printf(NAME ": Unable to register device %s.\n", name);
150 return rc;
151 }
152 printf(NAME ": Registered device %s\n", name);
153 }
154
155 printf(NAME ": Accepting connections\n");
156 task_retval(0);
157 async_manager();
158
159 /* Not reached */
160 return 0;
161}
162
163static int i8042_init(void)
164{
165 if (sysinfo_get_value("i8042.address.physical", &i8042_physical) != EOK)
166 return -1;
167
168 if (sysinfo_get_value("i8042.address.kernel", &i8042_kernel) != EOK)
169 return -1;
170
171 void *vaddr;
172 if (pio_enable((void *) i8042_physical, sizeof(i8042_t), &vaddr) != 0)
173 return -1;
174
175 i8042 = vaddr;
176
177 sysarg_t inr_a;
178 sysarg_t inr_b;
179
180 if (sysinfo_get_value("i8042.inr_a", &inr_a) != EOK)
181 return -1;
182
183 if (sysinfo_get_value("i8042.inr_b", &inr_b) != EOK)
184 return -1;
185
186 async_set_interrupt_received(i8042_irq_handler);
187
188 /* Disable kbd and aux */
189 wait_ready();
190 pio_write_8(&i8042->status, i8042_CMD_WRITE_CMDB);
191 wait_ready();
192 pio_write_8(&i8042->data, i8042_KBD_DISABLE | i8042_AUX_DISABLE);
193
194 /* Flush all current IO */
195 while (pio_read_8(&i8042->status) & i8042_OUTPUT_FULL)
196 (void) pio_read_8(&i8042->data);
197
198 i8042_kbd.cmds[0].addr = (void *) &((i8042_t *) i8042_kernel)->status;
199 i8042_kbd.cmds[3].addr = (void *) &((i8042_t *) i8042_kernel)->data;
200 register_irq(inr_a, device_assign_devno(), 0, &i8042_kbd);
201 register_irq(inr_b, device_assign_devno(), 0, &i8042_kbd);
202 printf("%s: registered for interrupts %" PRIun " and %" PRIun "\n",
203 NAME, inr_a, inr_b);
204
205 wait_ready();
206 pio_write_8(&i8042->status, i8042_CMD_WRITE_CMDB);
207 wait_ready();
208 pio_write_8(&i8042->data, i8042_KBD_IE | i8042_KBD_TRANSLATE |
209 i8042_AUX_IE);
210
211 return 0;
212}
213
214/** Character device connection handler */
215static void i8042_connection(ipc_callid_t iid, ipc_call_t *icall)
216{
217 ipc_callid_t callid;
218 ipc_call_t call;
219 sysarg_t method;
220 devmap_handle_t dh;
221 int retval;
222 int dev_id, i;
223
224 printf(NAME ": connection handler\n");
225
226 /* Get the device handle. */
227 dh = IPC_GET_ARG1(*icall);
228
229 /* Determine which disk device is the client connecting to. */
230 dev_id = -1;
231 for (i = 0; i < MAX_DEVS; i++) {
232 if (i8042_port[i].devmap_handle == dh)
233 dev_id = i;
234 }
235
236 if (dev_id < 0) {
237 async_answer_0(iid, EINVAL);
238 return;
239 }
240
241 /* Answer the IPC_M_CONNECT_ME_TO call. */
242 async_answer_0(iid, EOK);
243
244 printf(NAME ": accepted connection\n");
245
246 while (1) {
247 callid = async_get_call(&call);
248 method = IPC_GET_IMETHOD(call);
249 switch (method) {
250 case IPC_M_PHONE_HUNGUP:
251 /* The other side has hung up. */
252 async_answer_0(callid, EOK);
253 return;
254 case IPC_M_CONNECT_TO_ME:
255 printf(NAME ": creating callback connection\n");
256 if (i8042_port[dev_id].client_phone != -1) {
257 retval = ELIMIT;
258 break;
259 }
260 i8042_port[dev_id].client_phone = IPC_GET_ARG5(call);
261 retval = 0;
262 break;
263 case IPC_FIRST_USER_METHOD:
264 printf(NAME ": write %" PRIun " to devid %d\n",
265 IPC_GET_ARG1(call), dev_id);
266 i8042_port_write(dev_id, IPC_GET_ARG1(call));
267 retval = 0;
268 break;
269 default:
270 retval = EINVAL;
271 break;
272 }
273 async_answer_0(callid, retval);
274 }
275}
276
277void i8042_port_write(int devid, uint8_t data)
278{
279 if (devid == DEVID_AUX) {
280 wait_ready();
281 pio_write_8(&i8042->status, i8042_CMD_WRITE_AUX);
282 }
283 wait_ready();
284 pio_write_8(&i8042->data, data);
285}
286
287static void i8042_irq_handler(ipc_callid_t iid, ipc_call_t *call)
288{
289 int status, data;
290 int devid;
291
292 status = IPC_GET_ARG1(*call);
293 data = IPC_GET_ARG2(*call);
294
295 if ((status & i8042_AUX_DATA)) {
296 devid = DEVID_AUX;
297 } else {
298 devid = DEVID_PRI;
299 }
300
301 if (i8042_port[devid].client_phone != -1) {
302 async_msg_1(i8042_port[devid].client_phone,
303 IPC_FIRST_USER_METHOD, data);
304 }
305}
306
307/**
308 * @}
309 */
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