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1 | /* |
2 | * arch/xtensa/platform-iss/console.c | |
3 | * | |
4 | * This file is subject to the terms and conditions of the GNU General Public | |
5 | * License. See the file "COPYING" in the main directory of this archive | |
6 | * for more details. | |
7 | * | |
8 | * Copyright (C) 2001-2005 Tensilica Inc. | |
9 | * Authors Christian Zankel, Joe Taylor | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/config.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/sched.h> | |
16 | #include <linux/console.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/mm.h> | |
20 | #include <linux/major.h> | |
21 | #include <linux/param.h> | |
22 | #include <linux/serial.h> | |
23 | #include <linux/serialP.h> | |
24 | #include <linux/console.h> | |
25 | ||
26 | #include <asm/uaccess.h> | |
27 | #include <asm/irq.h> | |
28 | ||
29 | #include <xtensa/simcall.h> | |
30 | ||
31 | #include <linux/tty.h> | |
32 | #include <linux/tty_flip.h> | |
33 | ||
34 | #ifdef SERIAL_INLINE | |
35 | #define _INLINE_ inline | |
36 | #endif | |
37 | ||
38 | #define SERIAL_MAX_NUM_LINES 1 | |
39 | #define SERIAL_TIMER_VALUE (20 * HZ) | |
40 | ||
41 | static struct tty_driver *serial_driver; | |
42 | static struct timer_list serial_timer; | |
43 | ||
44 | static DEFINE_SPINLOCK(timer_lock); | |
45 | ||
46 | int errno; | |
47 | ||
48 | static int __simc (int a, int b, int c, int d, int e, int f) | |
49 | { | |
50 | int ret; | |
51 | __asm__ __volatile__ ("simcall\n" | |
52 | "mov %0, a2\n" | |
53 | "mov %1, a3\n" : "=a" (ret), "=a" (errno) | |
54 | : : "a2", "a3"); | |
55 | return ret; | |
56 | } | |
57 | ||
58 | static char *serial_version = "0.1"; | |
59 | static char *serial_name = "ISS serial driver"; | |
60 | ||
61 | /* | |
62 | * This routine is called whenever a serial port is opened. It | |
63 | * enables interrupts for a serial port, linking in its async structure into | |
64 | * the IRQ chain. It also performs the serial-specific | |
65 | * initialization for the tty structure. | |
66 | */ | |
67 | ||
68 | static void rs_poll(unsigned long); | |
69 | ||
70 | static int rs_open(struct tty_struct *tty, struct file * filp) | |
71 | { | |
72 | int line = tty->index; | |
73 | ||
74 | if ((line < 0) || (line >= SERIAL_MAX_NUM_LINES)) | |
75 | return -ENODEV; | |
76 | ||
77 | spin_lock(&timer_lock); | |
78 | ||
79 | if (tty->count == 1) { | |
80 | init_timer(&serial_timer); | |
81 | serial_timer.data = (unsigned long) tty; | |
82 | serial_timer.function = rs_poll; | |
83 | mod_timer(&serial_timer, jiffies + SERIAL_TIMER_VALUE); | |
84 | } | |
85 | spin_unlock(&timer_lock); | |
86 | ||
87 | return 0; | |
88 | } | |
89 | ||
90 | ||
91 | /* | |
92 | * ------------------------------------------------------------ | |
93 | * iss_serial_close() | |
94 | * | |
95 | * This routine is called when the serial port gets closed. First, we | |
96 | * wait for the last remaining data to be sent. Then, we unlink its | |
97 | * async structure from the interrupt chain if necessary, and we free | |
98 | * that IRQ if nothing is left in the chain. | |
99 | * ------------------------------------------------------------ | |
100 | */ | |
101 | static void rs_close(struct tty_struct *tty, struct file * filp) | |
102 | { | |
103 | spin_lock(&timer_lock); | |
104 | if (tty->count == 1) | |
105 | del_timer_sync(&serial_timer); | |
106 | spin_unlock(&timer_lock); | |
107 | } | |
108 | ||
109 | ||
110 | static int rs_write(struct tty_struct * tty, | |
111 | const unsigned char *buf, int count) | |
112 | { | |
113 | /* see drivers/char/serialX.c to reference original version */ | |
114 | ||
115 | __simc (SYS_write, 1, (unsigned long)buf, count, 0, 0); | |
116 | return count; | |
117 | } | |
118 | ||
119 | static void rs_poll(unsigned long priv) | |
120 | { | |
121 | struct tty_struct* tty = (struct tty_struct*) priv; | |
122 | ||
123 | struct timeval tv = { .tv_sec = 0, .tv_usec = 0 }; | |
124 | int i = 0; | |
125 | unsigned char c; | |
126 | ||
127 | spin_lock(&timer_lock); | |
128 | ||
129 | while (__simc(SYS_select_one, 0, XTISS_SELECT_ONE_READ, (int)&tv,0,0)){ | |
130 | __simc (SYS_read, 0, (unsigned long)&c, 1, 0, 0); | |
81459169 | 131 | tty_insert_flip_char(tty, c, TTY_NORMAL); |
7282bee7 CZ |
132 | i++; |
133 | } | |
134 | ||
135 | if (i) | |
136 | tty_flip_buffer_push(tty); | |
137 | ||
138 | ||
139 | mod_timer(&serial_timer, jiffies + SERIAL_TIMER_VALUE); | |
140 | spin_unlock(&timer_lock); | |
141 | } | |
142 | ||
143 | ||
144 | static void rs_put_char(struct tty_struct *tty, unsigned char ch) | |
145 | { | |
146 | char buf[2]; | |
147 | ||
148 | if (!tty) | |
149 | return; | |
150 | ||
151 | buf[0] = ch; | |
152 | buf[1] = '\0'; /* Is this NULL necessary? */ | |
153 | __simc (SYS_write, 1, (unsigned long) buf, 1, 0, 0); | |
154 | } | |
155 | ||
156 | static void rs_flush_chars(struct tty_struct *tty) | |
157 | { | |
158 | } | |
159 | ||
160 | static int rs_write_room(struct tty_struct *tty) | |
161 | { | |
162 | /* Let's say iss can always accept 2K characters.. */ | |
163 | return 2 * 1024; | |
164 | } | |
165 | ||
166 | static int rs_chars_in_buffer(struct tty_struct *tty) | |
167 | { | |
168 | /* the iss doesn't buffer characters */ | |
169 | return 0; | |
170 | } | |
171 | ||
172 | static void rs_hangup(struct tty_struct *tty) | |
173 | { | |
174 | /* Stub, once again.. */ | |
175 | } | |
176 | ||
177 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout) | |
178 | { | |
179 | /* Stub, once again.. */ | |
180 | } | |
181 | ||
182 | static int rs_read_proc(char *page, char **start, off_t off, int count, | |
183 | int *eof, void *data) | |
184 | { | |
185 | int len = 0; | |
186 | off_t begin = 0; | |
187 | ||
188 | len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version); | |
189 | *eof = 1; | |
190 | ||
191 | if (off >= len + begin) | |
192 | return 0; | |
193 | ||
194 | *start = page + (off - begin); | |
195 | return ((count < begin + len - off) ? count : begin + len - off); | |
196 | } | |
197 | ||
198 | ||
7282bee7 CZ |
199 | static struct tty_operations serial_ops = { |
200 | .open = rs_open, | |
201 | .close = rs_close, | |
202 | .write = rs_write, | |
203 | .put_char = rs_put_char, | |
204 | .flush_chars = rs_flush_chars, | |
205 | .write_room = rs_write_room, | |
206 | .chars_in_buffer = rs_chars_in_buffer, | |
207 | .hangup = rs_hangup, | |
208 | .wait_until_sent = rs_wait_until_sent, | |
209 | .read_proc = rs_read_proc | |
210 | }; | |
211 | ||
212 | int __init rs_init(void) | |
213 | { | |
214 | serial_driver = alloc_tty_driver(1); | |
215 | ||
216 | printk ("%s %s\n", serial_name, serial_version); | |
217 | ||
218 | /* Initialize the tty_driver structure */ | |
219 | ||
220 | serial_driver->owner = THIS_MODULE; | |
221 | serial_driver->driver_name = "iss_serial"; | |
222 | serial_driver->name = "ttyS"; | |
223 | serial_driver->major = TTY_MAJOR; | |
224 | serial_driver->minor_start = 64; | |
225 | serial_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
226 | serial_driver->subtype = SERIAL_TYPE_NORMAL; | |
227 | serial_driver->init_termios = tty_std_termios; | |
228 | serial_driver->init_termios.c_cflag = | |
229 | B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
230 | serial_driver->flags = TTY_DRIVER_REAL_RAW; | |
231 | ||
232 | tty_set_operations(serial_driver, &serial_ops); | |
233 | ||
234 | if (tty_register_driver(serial_driver)) | |
235 | panic("Couldn't register serial driver\n"); | |
236 | return 0; | |
237 | } | |
238 | ||
239 | ||
240 | static __exit void rs_exit(void) | |
241 | { | |
242 | int error; | |
243 | ||
244 | if ((error = tty_unregister_driver(serial_driver))) | |
245 | printk("ISS_SERIAL: failed to unregister serial driver (%d)\n", | |
246 | error); | |
247 | put_tty_driver(serial_driver); | |
248 | } | |
249 | ||
250 | ||
251 | /* We use `late_initcall' instead of just `__initcall' as a workaround for | |
252 | * the fact that (1) simcons_tty_init can't be called before tty_init, | |
253 | * (2) tty_init is called via `module_init', (3) if statically linked, | |
254 | * module_init == device_init, and (4) there's no ordering of init lists. | |
255 | * We can do this easily because simcons is always statically linked, but | |
256 | * other tty drivers that depend on tty_init and which must use | |
257 | * `module_init' to declare their init routines are likely to be broken. | |
258 | */ | |
259 | ||
260 | late_initcall(rs_init); | |
261 | ||
262 | ||
263 | #ifdef CONFIG_SERIAL_CONSOLE | |
264 | ||
265 | static void iss_console_write(struct console *co, const char *s, unsigned count) | |
266 | { | |
267 | int len = strlen(s); | |
268 | ||
269 | if (s != 0 && *s != 0) | |
270 | __simc (SYS_write, 1, (unsigned long)s, | |
271 | count < len ? count : len,0,0); | |
272 | } | |
273 | ||
274 | static struct tty_driver* iss_console_device(struct console *c, int *index) | |
275 | { | |
276 | *index = c->index; | |
277 | return serial_driver; | |
278 | } | |
279 | ||
280 | ||
281 | static struct console sercons = { | |
282 | .name = "ttyS", | |
283 | .write = iss_console_write, | |
284 | .device = iss_console_device, | |
285 | .flags = CON_PRINTBUFFER, | |
286 | .index = -1 | |
287 | }; | |
288 | ||
289 | static int __init iss_console_init(void) | |
290 | { | |
291 | register_console(&sercons); | |
292 | return 0; | |
293 | } | |
294 | ||
295 | console_initcall(iss_console_init); | |
296 | ||
297 | #endif /* CONFIG_SERIAL_CONSOLE */ | |
298 |