Commit | Line | Data |
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7282bee7 | 1 | /* |
5fee325e | 2 | * arch/xtensa/platforms/iss/console.c |
7282bee7 CZ |
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> | |
7282bee7 CZ |
13 | #include <linux/kernel.h> |
14 | #include <linux/sched.h> | |
15 | #include <linux/console.h> | |
16 | #include <linux/init.h> | |
7282bee7 CZ |
17 | #include <linux/mm.h> |
18 | #include <linux/major.h> | |
19 | #include <linux/param.h> | |
14071693 | 20 | #include <linux/seq_file.h> |
7282bee7 | 21 | #include <linux/serial.h> |
7282bee7 | 22 | |
7c0f6ba6 | 23 | #include <linux/uaccess.h> |
7282bee7 CZ |
24 | #include <asm/irq.h> |
25 | ||
5fee325e | 26 | #include <platform/simcall.h> |
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27 | |
28 | #include <linux/tty.h> | |
29 | #include <linux/tty_flip.h> | |
30 | ||
7282bee7 | 31 | #define SERIAL_MAX_NUM_LINES 1 |
8bac8328 | 32 | #define SERIAL_TIMER_VALUE (HZ / 10) |
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33 | |
34 | static struct tty_driver *serial_driver; | |
885f8b0f | 35 | static struct tty_port serial_port; |
7282bee7 CZ |
36 | static struct timer_list serial_timer; |
37 | ||
38 | static DEFINE_SPINLOCK(timer_lock); | |
39 | ||
7282bee7 CZ |
40 | static char *serial_version = "0.1"; |
41 | static char *serial_name = "ISS serial driver"; | |
42 | ||
43 | /* | |
44 | * This routine is called whenever a serial port is opened. It | |
45 | * enables interrupts for a serial port, linking in its async structure into | |
46 | * the IRQ chain. It also performs the serial-specific | |
47 | * initialization for the tty structure. | |
48 | */ | |
49 | ||
50 | static void rs_poll(unsigned long); | |
51 | ||
52 | static int rs_open(struct tty_struct *tty, struct file * filp) | |
53 | { | |
885f8b0f | 54 | tty->port = &serial_port; |
efefbcc5 | 55 | spin_lock_bh(&timer_lock); |
7282bee7 | 56 | if (tty->count == 1) { |
2e124b4a JS |
57 | setup_timer(&serial_timer, rs_poll, |
58 | (unsigned long)&serial_port); | |
7282bee7 CZ |
59 | mod_timer(&serial_timer, jiffies + SERIAL_TIMER_VALUE); |
60 | } | |
efefbcc5 | 61 | spin_unlock_bh(&timer_lock); |
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62 | |
63 | return 0; | |
64 | } | |
65 | ||
66 | ||
67 | /* | |
68 | * ------------------------------------------------------------ | |
69 | * iss_serial_close() | |
70 | * | |
71 | * This routine is called when the serial port gets closed. First, we | |
72 | * wait for the last remaining data to be sent. Then, we unlink its | |
73 | * async structure from the interrupt chain if necessary, and we free | |
74 | * that IRQ if nothing is left in the chain. | |
75 | * ------------------------------------------------------------ | |
76 | */ | |
77 | static void rs_close(struct tty_struct *tty, struct file * filp) | |
78 | { | |
c9ddb1d6 | 79 | spin_lock_bh(&timer_lock); |
7282bee7 CZ |
80 | if (tty->count == 1) |
81 | del_timer_sync(&serial_timer); | |
c9ddb1d6 | 82 | spin_unlock_bh(&timer_lock); |
7282bee7 CZ |
83 | } |
84 | ||
85 | ||
86 | static int rs_write(struct tty_struct * tty, | |
87 | const unsigned char *buf, int count) | |
88 | { | |
89 | /* see drivers/char/serialX.c to reference original version */ | |
90 | ||
c88d8df0 | 91 | simc_write(1, buf, count); |
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92 | return count; |
93 | } | |
94 | ||
95 | static void rs_poll(unsigned long priv) | |
96 | { | |
2e124b4a | 97 | struct tty_port *port = (struct tty_port *)priv; |
7282bee7 | 98 | int i = 0; |
362014c8 | 99 | int rd = 1; |
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100 | unsigned char c; |
101 | ||
102 | spin_lock(&timer_lock); | |
103 | ||
f4b93ba9 | 104 | while (simc_poll(0)) { |
362014c8 MF |
105 | rd = simc_read(0, &c, 1); |
106 | if (rd <= 0) | |
107 | break; | |
92a19f9c | 108 | tty_insert_flip_char(port, c, TTY_NORMAL); |
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109 | i++; |
110 | } | |
111 | ||
112 | if (i) | |
2e124b4a | 113 | tty_flip_buffer_push(port); |
362014c8 MF |
114 | if (rd) |
115 | mod_timer(&serial_timer, jiffies + SERIAL_TIMER_VALUE); | |
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116 | spin_unlock(&timer_lock); |
117 | } | |
118 | ||
119 | ||
5a891ed5 | 120 | static int rs_put_char(struct tty_struct *tty, unsigned char ch) |
7282bee7 | 121 | { |
c88d8df0 | 122 | return rs_write(tty, &ch, 1); |
7282bee7 CZ |
123 | } |
124 | ||
125 | static void rs_flush_chars(struct tty_struct *tty) | |
126 | { | |
127 | } | |
128 | ||
129 | static int rs_write_room(struct tty_struct *tty) | |
130 | { | |
131 | /* Let's say iss can always accept 2K characters.. */ | |
132 | return 2 * 1024; | |
133 | } | |
134 | ||
135 | static int rs_chars_in_buffer(struct tty_struct *tty) | |
136 | { | |
137 | /* the iss doesn't buffer characters */ | |
138 | return 0; | |
139 | } | |
140 | ||
141 | static void rs_hangup(struct tty_struct *tty) | |
142 | { | |
143 | /* Stub, once again.. */ | |
144 | } | |
145 | ||
146 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout) | |
147 | { | |
148 | /* Stub, once again.. */ | |
149 | } | |
150 | ||
14071693 | 151 | static int rs_proc_show(struct seq_file *m, void *v) |
7282bee7 | 152 | { |
14071693 AD |
153 | seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version); |
154 | return 0; | |
155 | } | |
7282bee7 | 156 | |
14071693 AD |
157 | static int rs_proc_open(struct inode *inode, struct file *file) |
158 | { | |
159 | return single_open(file, rs_proc_show, NULL); | |
7282bee7 CZ |
160 | } |
161 | ||
14071693 AD |
162 | static const struct file_operations rs_proc_fops = { |
163 | .owner = THIS_MODULE, | |
164 | .open = rs_proc_open, | |
165 | .read = seq_read, | |
166 | .llseek = seq_lseek, | |
167 | .release = single_release, | |
168 | }; | |
7282bee7 | 169 | |
1cceefd3 | 170 | static const struct tty_operations serial_ops = { |
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171 | .open = rs_open, |
172 | .close = rs_close, | |
173 | .write = rs_write, | |
174 | .put_char = rs_put_char, | |
175 | .flush_chars = rs_flush_chars, | |
176 | .write_room = rs_write_room, | |
177 | .chars_in_buffer = rs_chars_in_buffer, | |
178 | .hangup = rs_hangup, | |
179 | .wait_until_sent = rs_wait_until_sent, | |
14071693 | 180 | .proc_fops = &rs_proc_fops, |
7282bee7 CZ |
181 | }; |
182 | ||
183 | int __init rs_init(void) | |
184 | { | |
885f8b0f JS |
185 | tty_port_init(&serial_port); |
186 | ||
410235fd | 187 | serial_driver = alloc_tty_driver(SERIAL_MAX_NUM_LINES); |
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188 | |
189 | printk ("%s %s\n", serial_name, serial_version); | |
190 | ||
191 | /* Initialize the tty_driver structure */ | |
192 | ||
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193 | serial_driver->driver_name = "iss_serial"; |
194 | serial_driver->name = "ttyS"; | |
195 | serial_driver->major = TTY_MAJOR; | |
196 | serial_driver->minor_start = 64; | |
197 | serial_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
198 | serial_driver->subtype = SERIAL_TYPE_NORMAL; | |
199 | serial_driver->init_termios = tty_std_termios; | |
200 | serial_driver->init_termios.c_cflag = | |
201 | B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
202 | serial_driver->flags = TTY_DRIVER_REAL_RAW; | |
203 | ||
204 | tty_set_operations(serial_driver, &serial_ops); | |
b19e2ca7 | 205 | tty_port_link_device(&serial_port, serial_driver, 0); |
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206 | |
207 | if (tty_register_driver(serial_driver)) | |
208 | panic("Couldn't register serial driver\n"); | |
209 | return 0; | |
210 | } | |
211 | ||
212 | ||
213 | static __exit void rs_exit(void) | |
214 | { | |
215 | int error; | |
216 | ||
217 | if ((error = tty_unregister_driver(serial_driver))) | |
218 | printk("ISS_SERIAL: failed to unregister serial driver (%d)\n", | |
219 | error); | |
220 | put_tty_driver(serial_driver); | |
191c5f10 | 221 | tty_port_destroy(&serial_port); |
7282bee7 CZ |
222 | } |
223 | ||
224 | ||
225 | /* We use `late_initcall' instead of just `__initcall' as a workaround for | |
226 | * the fact that (1) simcons_tty_init can't be called before tty_init, | |
227 | * (2) tty_init is called via `module_init', (3) if statically linked, | |
228 | * module_init == device_init, and (4) there's no ordering of init lists. | |
229 | * We can do this easily because simcons is always statically linked, but | |
230 | * other tty drivers that depend on tty_init and which must use | |
231 | * `module_init' to declare their init routines are likely to be broken. | |
232 | */ | |
233 | ||
234 | late_initcall(rs_init); | |
235 | ||
236 | ||
237 | #ifdef CONFIG_SERIAL_CONSOLE | |
238 | ||
239 | static void iss_console_write(struct console *co, const char *s, unsigned count) | |
240 | { | |
241 | int len = strlen(s); | |
242 | ||
243 | if (s != 0 && *s != 0) | |
f4b93ba9 | 244 | simc_write(1, s, count < len ? count : len); |
7282bee7 CZ |
245 | } |
246 | ||
247 | static struct tty_driver* iss_console_device(struct console *c, int *index) | |
248 | { | |
249 | *index = c->index; | |
250 | return serial_driver; | |
251 | } | |
252 | ||
253 | ||
254 | static struct console sercons = { | |
255 | .name = "ttyS", | |
256 | .write = iss_console_write, | |
257 | .device = iss_console_device, | |
258 | .flags = CON_PRINTBUFFER, | |
259 | .index = -1 | |
260 | }; | |
261 | ||
262 | static int __init iss_console_init(void) | |
263 | { | |
264 | register_console(&sercons); | |
265 | return 0; | |
266 | } | |
267 | ||
268 | console_initcall(iss_console_init); | |
269 | ||
270 | #endif /* CONFIG_SERIAL_CONSOLE */ | |
271 |