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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> |
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22 | |
23 | #include <asm/uaccess.h> | |
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 | ||
173d6681 CZ |
31 | #ifdef SERIAL_INLINE |
32 | #define _INLINE_ inline | |
33 | #endif | |
34 | ||
7282bee7 | 35 | #define SERIAL_MAX_NUM_LINES 1 |
8bac8328 | 36 | #define SERIAL_TIMER_VALUE (HZ / 10) |
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37 | |
38 | static struct tty_driver *serial_driver; | |
885f8b0f | 39 | static struct tty_port serial_port; |
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40 | static struct timer_list serial_timer; |
41 | ||
42 | static DEFINE_SPINLOCK(timer_lock); | |
43 | ||
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44 | static char *serial_version = "0.1"; |
45 | static char *serial_name = "ISS serial driver"; | |
46 | ||
47 | /* | |
48 | * This routine is called whenever a serial port is opened. It | |
49 | * enables interrupts for a serial port, linking in its async structure into | |
50 | * the IRQ chain. It also performs the serial-specific | |
51 | * initialization for the tty structure. | |
52 | */ | |
53 | ||
54 | static void rs_poll(unsigned long); | |
55 | ||
56 | static int rs_open(struct tty_struct *tty, struct file * filp) | |
57 | { | |
885f8b0f | 58 | tty->port = &serial_port; |
7282bee7 | 59 | spin_lock(&timer_lock); |
7282bee7 | 60 | if (tty->count == 1) { |
2e124b4a JS |
61 | setup_timer(&serial_timer, rs_poll, |
62 | (unsigned long)&serial_port); | |
7282bee7 CZ |
63 | mod_timer(&serial_timer, jiffies + SERIAL_TIMER_VALUE); |
64 | } | |
65 | spin_unlock(&timer_lock); | |
66 | ||
67 | return 0; | |
68 | } | |
69 | ||
70 | ||
71 | /* | |
72 | * ------------------------------------------------------------ | |
73 | * iss_serial_close() | |
74 | * | |
75 | * This routine is called when the serial port gets closed. First, we | |
76 | * wait for the last remaining data to be sent. Then, we unlink its | |
77 | * async structure from the interrupt chain if necessary, and we free | |
78 | * that IRQ if nothing is left in the chain. | |
79 | * ------------------------------------------------------------ | |
80 | */ | |
81 | static void rs_close(struct tty_struct *tty, struct file * filp) | |
82 | { | |
c9ddb1d6 | 83 | spin_lock_bh(&timer_lock); |
7282bee7 CZ |
84 | if (tty->count == 1) |
85 | del_timer_sync(&serial_timer); | |
c9ddb1d6 | 86 | spin_unlock_bh(&timer_lock); |
7282bee7 CZ |
87 | } |
88 | ||
89 | ||
90 | static int rs_write(struct tty_struct * tty, | |
91 | const unsigned char *buf, int count) | |
92 | { | |
93 | /* see drivers/char/serialX.c to reference original version */ | |
94 | ||
c88d8df0 | 95 | simc_write(1, buf, count); |
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96 | return count; |
97 | } | |
98 | ||
99 | static void rs_poll(unsigned long priv) | |
100 | { | |
2e124b4a | 101 | struct tty_port *port = (struct tty_port *)priv; |
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102 | struct timeval tv = { .tv_sec = 0, .tv_usec = 0 }; |
103 | int i = 0; | |
104 | unsigned char c; | |
105 | ||
106 | spin_lock(&timer_lock); | |
107 | ||
108 | while (__simc(SYS_select_one, 0, XTISS_SELECT_ONE_READ, (int)&tv,0,0)){ | |
109 | __simc (SYS_read, 0, (unsigned long)&c, 1, 0, 0); | |
92a19f9c | 110 | tty_insert_flip_char(port, c, TTY_NORMAL); |
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111 | i++; |
112 | } | |
113 | ||
114 | if (i) | |
2e124b4a | 115 | tty_flip_buffer_push(port); |
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116 | |
117 | ||
118 | mod_timer(&serial_timer, jiffies + SERIAL_TIMER_VALUE); | |
119 | spin_unlock(&timer_lock); | |
120 | } | |
121 | ||
122 | ||
5a891ed5 | 123 | static int rs_put_char(struct tty_struct *tty, unsigned char ch) |
7282bee7 | 124 | { |
c88d8df0 | 125 | return rs_write(tty, &ch, 1); |
7282bee7 CZ |
126 | } |
127 | ||
128 | static void rs_flush_chars(struct tty_struct *tty) | |
129 | { | |
130 | } | |
131 | ||
132 | static int rs_write_room(struct tty_struct *tty) | |
133 | { | |
134 | /* Let's say iss can always accept 2K characters.. */ | |
135 | return 2 * 1024; | |
136 | } | |
137 | ||
138 | static int rs_chars_in_buffer(struct tty_struct *tty) | |
139 | { | |
140 | /* the iss doesn't buffer characters */ | |
141 | return 0; | |
142 | } | |
143 | ||
144 | static void rs_hangup(struct tty_struct *tty) | |
145 | { | |
146 | /* Stub, once again.. */ | |
147 | } | |
148 | ||
149 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout) | |
150 | { | |
151 | /* Stub, once again.. */ | |
152 | } | |
153 | ||
14071693 | 154 | static int rs_proc_show(struct seq_file *m, void *v) |
7282bee7 | 155 | { |
14071693 AD |
156 | seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version); |
157 | return 0; | |
158 | } | |
7282bee7 | 159 | |
14071693 AD |
160 | static int rs_proc_open(struct inode *inode, struct file *file) |
161 | { | |
162 | return single_open(file, rs_proc_show, NULL); | |
7282bee7 CZ |
163 | } |
164 | ||
14071693 AD |
165 | static const struct file_operations rs_proc_fops = { |
166 | .owner = THIS_MODULE, | |
167 | .open = rs_proc_open, | |
168 | .read = seq_read, | |
169 | .llseek = seq_lseek, | |
170 | .release = single_release, | |
171 | }; | |
7282bee7 | 172 | |
1cceefd3 | 173 | static const struct tty_operations serial_ops = { |
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174 | .open = rs_open, |
175 | .close = rs_close, | |
176 | .write = rs_write, | |
177 | .put_char = rs_put_char, | |
178 | .flush_chars = rs_flush_chars, | |
179 | .write_room = rs_write_room, | |
180 | .chars_in_buffer = rs_chars_in_buffer, | |
181 | .hangup = rs_hangup, | |
182 | .wait_until_sent = rs_wait_until_sent, | |
14071693 | 183 | .proc_fops = &rs_proc_fops, |
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184 | }; |
185 | ||
186 | int __init rs_init(void) | |
187 | { | |
885f8b0f JS |
188 | tty_port_init(&serial_port); |
189 | ||
410235fd | 190 | serial_driver = alloc_tty_driver(SERIAL_MAX_NUM_LINES); |
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191 | |
192 | printk ("%s %s\n", serial_name, serial_version); | |
193 | ||
194 | /* Initialize the tty_driver structure */ | |
195 | ||
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196 | serial_driver->driver_name = "iss_serial"; |
197 | serial_driver->name = "ttyS"; | |
198 | serial_driver->major = TTY_MAJOR; | |
199 | serial_driver->minor_start = 64; | |
200 | serial_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
201 | serial_driver->subtype = SERIAL_TYPE_NORMAL; | |
202 | serial_driver->init_termios = tty_std_termios; | |
203 | serial_driver->init_termios.c_cflag = | |
204 | B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
205 | serial_driver->flags = TTY_DRIVER_REAL_RAW; | |
206 | ||
207 | tty_set_operations(serial_driver, &serial_ops); | |
b19e2ca7 | 208 | tty_port_link_device(&serial_port, serial_driver, 0); |
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209 | |
210 | if (tty_register_driver(serial_driver)) | |
211 | panic("Couldn't register serial driver\n"); | |
212 | return 0; | |
213 | } | |
214 | ||
215 | ||
216 | static __exit void rs_exit(void) | |
217 | { | |
218 | int error; | |
219 | ||
220 | if ((error = tty_unregister_driver(serial_driver))) | |
221 | printk("ISS_SERIAL: failed to unregister serial driver (%d)\n", | |
222 | error); | |
223 | put_tty_driver(serial_driver); | |
191c5f10 | 224 | tty_port_destroy(&serial_port); |
7282bee7 CZ |
225 | } |
226 | ||
227 | ||
228 | /* We use `late_initcall' instead of just `__initcall' as a workaround for | |
229 | * the fact that (1) simcons_tty_init can't be called before tty_init, | |
230 | * (2) tty_init is called via `module_init', (3) if statically linked, | |
231 | * module_init == device_init, and (4) there's no ordering of init lists. | |
232 | * We can do this easily because simcons is always statically linked, but | |
233 | * other tty drivers that depend on tty_init and which must use | |
234 | * `module_init' to declare their init routines are likely to be broken. | |
235 | */ | |
236 | ||
237 | late_initcall(rs_init); | |
238 | ||
239 | ||
240 | #ifdef CONFIG_SERIAL_CONSOLE | |
241 | ||
242 | static void iss_console_write(struct console *co, const char *s, unsigned count) | |
243 | { | |
244 | int len = strlen(s); | |
245 | ||
246 | if (s != 0 && *s != 0) | |
247 | __simc (SYS_write, 1, (unsigned long)s, | |
248 | count < len ? count : len,0,0); | |
249 | } | |
250 | ||
251 | static struct tty_driver* iss_console_device(struct console *c, int *index) | |
252 | { | |
253 | *index = c->index; | |
254 | return serial_driver; | |
255 | } | |
256 | ||
257 | ||
258 | static struct console sercons = { | |
259 | .name = "ttyS", | |
260 | .write = iss_console_write, | |
261 | .device = iss_console_device, | |
262 | .flags = CON_PRINTBUFFER, | |
263 | .index = -1 | |
264 | }; | |
265 | ||
266 | static int __init iss_console_init(void) | |
267 | { | |
268 | register_console(&sercons); | |
269 | return 0; | |
270 | } | |
271 | ||
272 | console_initcall(iss_console_init); | |
273 | ||
274 | #endif /* CONFIG_SERIAL_CONSOLE */ | |
275 |