source: mainline/uspace/srv/hw/char/i8042/i8042.c@ 7bdcc45

lfn serial ticket/834-toolchain-update topic/fix-logger-deadlock topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 7bdcc45 was 228e490, checked in by Martin Decky <martin@…>, 15 years ago

initial modifications for supporting declarative IPC interfaces
  • 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 <ipc/ipc.h>
43#include <async.h>
44#include <unistd.h>
45#include <sysinfo.h>
46#include <stdio.h>
47#include <errno.h>
48#include <inttypes.h>
49
50#include "i8042.h"
51
52#define NAME "i8042"
53#define NAMESPACE "char"
54
55/* Interesting bits for status register */
56#define i8042_OUTPUT_FULL 0x01
57#define i8042_INPUT_FULL 0x02
58#define i8042_AUX_DATA 0x20
59
60/* Command constants */
61#define i8042_CMD_WRITE_CMDB 0x60 /**< write command byte */
62#define i8042_CMD_WRITE_AUX 0xd4 /**< write aux device */
63
64/* Command byte fields */
65#define i8042_KBD_IE 0x01
66#define i8042_AUX_IE 0x02
67#define i8042_KBD_DISABLE 0x10
68#define i8042_AUX_DISABLE 0x20
69#define i8042_KBD_TRANSLATE 0x40
70
71
72enum {
73 DEVID_PRI = 0, /**< primary device */
74 DEVID_AUX = 1, /**< AUX device */
75 MAX_DEVS = 2
76};
77
78static irq_cmd_t i8042_cmds[] = {
79 {
80 .cmd = CMD_PIO_READ_8,
81 .addr = NULL, /* will be patched in run-time */
82 .dstarg = 1
83 },
84 {
85 .cmd = CMD_BTEST,
86 .value = i8042_OUTPUT_FULL,
87 .srcarg = 1,
88 .dstarg = 3
89 },
90 {
91 .cmd = CMD_PREDICATE,
92 .value = 2,
93 .srcarg = 3
94 },
95 {
96 .cmd = CMD_PIO_READ_8,
97 .addr = NULL, /* will be patched in run-time */
98 .dstarg = 2
99 },
100 {
101 .cmd = CMD_ACCEPT
102 }
103};
104
105static irq_code_t i8042_kbd = {
106 sizeof(i8042_cmds) / sizeof(irq_cmd_t),
107 i8042_cmds
108};
109
110static uintptr_t i8042_physical;
111static uintptr_t i8042_kernel;
112static i8042_t * i8042;
113
114static i8042_port_t i8042_port[MAX_DEVS];
115
116static void wait_ready(void)
117{
118 while (pio_read_8(&i8042->status) & i8042_INPUT_FULL);
119}
120
121static void i8042_irq_handler(ipc_callid_t iid, ipc_call_t *call);
122static void i8042_connection(ipc_callid_t iid, ipc_call_t *icall);
123static int i8042_init(void);
124static void i8042_port_write(int devid, uint8_t data);
125
126
127int main(int argc, char *argv[])
128{
129 char name[16];
130 int i, rc;
131 char dchar[MAX_DEVS] = { 'a', 'b' };
132
133 printf(NAME ": i8042 PS/2 port driver\n");
134
135 rc = devmap_driver_register(NAME, i8042_connection);
136 if (rc < 0) {
137 printf(NAME ": Unable to register driver.\n");
138 return rc;
139 }
140
141 if (i8042_init() != EOK)
142 return -1;
143
144 for (i = 0; i < MAX_DEVS; i++) {
145 i8042_port[i].client_phone = -1;
146
147 snprintf(name, 16, "%s/ps2%c", NAMESPACE, dchar[i]);
148 rc = devmap_device_register(name, &i8042_port[i].devmap_handle);
149 if (rc != EOK) {
150 devmap_hangup_phone(DEVMAP_DRIVER);
151 printf(NAME ": Unable to register device %s.\n", name);
152 return rc;
153 }
154 printf(NAME ": Registered device %s\n", name);
155 }
156
157 printf(NAME ": Accepting connections\n");
158 task_retval(0);
159 async_manager();
160
161 /* Not reached */
162 return 0;
163}
164
165static int i8042_init(void)
166{
167 if (sysinfo_get_value("i8042.address.physical", &i8042_physical) != EOK)
168 return -1;
169
170 if (sysinfo_get_value("i8042.address.kernel", &i8042_kernel) != EOK)
171 return -1;
172
173 void *vaddr;
174 if (pio_enable((void *) i8042_physical, sizeof(i8042_t), &vaddr) != 0)
175 return -1;
176
177 i8042 = vaddr;
178
179 sysarg_t inr_a;
180 sysarg_t inr_b;
181
182 if (sysinfo_get_value("i8042.inr_a", &inr_a) != EOK)
183 return -1;
184
185 if (sysinfo_get_value("i8042.inr_b", &inr_b) != EOK)
186 return -1;
187
188 async_set_interrupt_received(i8042_irq_handler);
189
190 /* Disable kbd and aux */
191 wait_ready();
192 pio_write_8(&i8042->status, i8042_CMD_WRITE_CMDB);
193 wait_ready();
194 pio_write_8(&i8042->data, i8042_KBD_DISABLE | i8042_AUX_DISABLE);
195
196 /* Flush all current IO */
197 while (pio_read_8(&i8042->status) & i8042_OUTPUT_FULL)
198 (void) pio_read_8(&i8042->data);
199
200 i8042_kbd.cmds[0].addr = (void *) &((i8042_t *) i8042_kernel)->status;
201 i8042_kbd.cmds[3].addr = (void *) &((i8042_t *) i8042_kernel)->data;
202 ipc_register_irq(inr_a, device_assign_devno(), 0, &i8042_kbd);
203 ipc_register_irq(inr_b, device_assign_devno(), 0, &i8042_kbd);
204 printf("%s: registered for interrupts %" PRIun " and %" PRIun "\n",
205 NAME, inr_a, inr_b);
206
207 wait_ready();
208 pio_write_8(&i8042->status, i8042_CMD_WRITE_CMDB);
209 wait_ready();
210 pio_write_8(&i8042->data, i8042_KBD_IE | i8042_KBD_TRANSLATE |
211 i8042_AUX_IE);
212
213 return 0;
214}
215
216/** Character device connection handler */
217static void i8042_connection(ipc_callid_t iid, ipc_call_t *icall)
218{
219 ipc_callid_t callid;
220 ipc_call_t call;
221 sysarg_t method;
222 devmap_handle_t dh;
223 int retval;
224 int dev_id, i;
225
226 printf(NAME ": connection handler\n");
227
228 /* Get the device handle. */
229 dh = IPC_GET_ARG1(*icall);
230
231 /* Determine which disk device is the client connecting to. */
232 dev_id = -1;
233 for (i = 0; i < MAX_DEVS; i++) {
234 if (i8042_port[i].devmap_handle == dh)
235 dev_id = i;
236 }
237
238 if (dev_id < 0) {
239 ipc_answer_0(iid, EINVAL);
240 return;
241 }
242
243 /* Answer the IPC_M_CONNECT_ME_TO call. */
244 ipc_answer_0(iid, EOK);
245
246 printf(NAME ": accepted connection\n");
247
248 while (1) {
249 callid = async_get_call(&call);
250 method = IPC_GET_IMETHOD(call);
251 switch (method) {
252 case IPC_M_PHONE_HUNGUP:
253 /* The other side has hung up. */
254 ipc_answer_0(callid, EOK);
255 return;
256 case IPC_M_CONNECT_TO_ME:
257 printf(NAME ": creating callback connection\n");
258 if (i8042_port[dev_id].client_phone != -1) {
259 retval = ELIMIT;
260 break;
261 }
262 i8042_port[dev_id].client_phone = IPC_GET_ARG5(call);
263 retval = 0;
264 break;
265 case IPC_FIRST_USER_METHOD:
266 printf(NAME ": write %" PRIun " to devid %d\n",
267 IPC_GET_ARG1(call), dev_id);
268 i8042_port_write(dev_id, IPC_GET_ARG1(call));
269 retval = 0;
270 break;
271 default:
272 retval = EINVAL;
273 break;
274 }
275 ipc_answer_0(callid, retval);
276 }
277}
278
279void i8042_port_write(int devid, uint8_t data)
280{
281 if (devid == DEVID_AUX) {
282 wait_ready();
283 pio_write_8(&i8042->status, i8042_CMD_WRITE_AUX);
284 }
285 wait_ready();
286 pio_write_8(&i8042->data, data);
287}
288
289static void i8042_irq_handler(ipc_callid_t iid, ipc_call_t *call)
290{
291 int status, data;
292 int devid;
293
294 status = IPC_GET_ARG1(*call);
295 data = IPC_GET_ARG2(*call);
296
297 if ((status & i8042_AUX_DATA)) {
298 devid = DEVID_AUX;
299 } else {
300 devid = DEVID_PRI;
301 }
302
303 if (i8042_port[devid].client_phone != -1) {
304 async_msg_1(i8042_port[devid].client_phone,
305 IPC_FIRST_USER_METHOD, data);
306 }
307}
308
309/**
310 * @}
311 */
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