Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * PDC Console support - ie use firmware to dump text via boot console | |
3 | * | |
4 | * Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org> | |
5 | * Copyright (C) 2000 Martin K Petersen <mkp at mkp.net> | |
6 | * Copyright (C) 2000 John Marvin <jsm at parisc-linux.org> | |
7 | * Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org> | |
8 | * Copyright (C) 2000 Philipp Rumpf <prumpf with tux.org> | |
9 | * Copyright (C) 2000 Michael Ang <mang with subcarrier.org> | |
10 | * Copyright (C) 2000 Grant Grundler <grundler with parisc-linux.org> | |
11 | * Copyright (C) 2001-2002 Ryan Bradetich <rbrad at parisc-linux.org> | |
12 | * Copyright (C) 2001 Helge Deller <deller at parisc-linux.org> | |
13 | * Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org> | |
14 | * Copyright (C) 2002 Randolph Chung <tausq with parisc-linux.org> | |
650a35f8 | 15 | * Copyright (C) 2010 Guy Martin <gmsoft at tuxicoman.be> |
1da177e4 LT |
16 | * |
17 | * | |
18 | * This program is free software; you can redistribute it and/or modify | |
19 | * it under the terms of the GNU General Public License as published by | |
20 | * the Free Software Foundation; either version 2 of the License, or | |
21 | * (at your option) any later version. | |
22 | * | |
23 | * This program is distributed in the hope that it will be useful, | |
24 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
25 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
26 | * GNU General Public License for more details. | |
27 | * | |
28 | * You should have received a copy of the GNU General Public License | |
29 | * along with this program; if not, write to the Free Software | |
30 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
31 | */ | |
32 | ||
33 | /* | |
34 | * The PDC console is a simple console, which can be used for debugging | |
650a35f8 GM |
35 | * boot related problems on HP PA-RISC machines. It is also useful when no |
36 | * other console works. | |
1da177e4 LT |
37 | * |
38 | * This code uses the ROM (=PDC) based functions to read and write characters | |
39 | * from and to PDC's boot path. | |
1da177e4 LT |
40 | */ |
41 | ||
42 | /* Define EARLY_BOOTUP_DEBUG to debug kernel related boot problems. | |
43 | * On production kernels EARLY_BOOTUP_DEBUG should be undefined. */ | |
7c92e972 | 44 | #define EARLY_BOOTUP_DEBUG |
1da177e4 LT |
45 | |
46 | ||
1da177e4 LT |
47 | #include <linux/kernel.h> |
48 | #include <linux/console.h> | |
49 | #include <linux/string.h> | |
50 | #include <linux/init.h> | |
1da177e4 LT |
51 | #include <linux/major.h> |
52 | #include <linux/tty.h> | |
4a8a0788 | 53 | #include <asm/page.h> /* for PAGE0 */ |
1da177e4 LT |
54 | #include <asm/pdc.h> /* for iodc_call() proto and friends */ |
55 | ||
aefa8b6b | 56 | static DEFINE_SPINLOCK(pdc_console_lock); |
650a35f8 | 57 | static struct console pdc_cons; |
1da177e4 LT |
58 | |
59 | static void pdc_console_write(struct console *co, const char *s, unsigned count) | |
60 | { | |
ef1afd4d KM |
61 | int i = 0; |
62 | unsigned long flags; | |
63 | ||
64 | spin_lock_irqsave(&pdc_console_lock, flags); | |
65 | do { | |
66 | i += pdc_iodc_print(s + i, count - i); | |
67 | } while (i < count); | |
68 | spin_unlock_irqrestore(&pdc_console_lock, flags); | |
1da177e4 LT |
69 | } |
70 | ||
1da177e4 LT |
71 | int pdc_console_poll_key(struct console *co) |
72 | { | |
ef1afd4d KM |
73 | int c; |
74 | unsigned long flags; | |
75 | ||
76 | spin_lock_irqsave(&pdc_console_lock, flags); | |
77 | c = pdc_iodc_getc(); | |
78 | spin_unlock_irqrestore(&pdc_console_lock, flags); | |
79 | ||
80 | return c; | |
1da177e4 LT |
81 | } |
82 | ||
83 | static int pdc_console_setup(struct console *co, char *options) | |
84 | { | |
85 | return 0; | |
86 | } | |
87 | ||
88 | #if defined(CONFIG_PDC_CONSOLE) | |
a8f340e3 | 89 | #include <linux/vt_kern.h> |
650a35f8 GM |
90 | #include <linux/tty_flip.h> |
91 | ||
92 | #define PDC_CONS_POLL_DELAY (30 * HZ / 1000) | |
93 | ||
52b762f7 JS |
94 | static void pdc_console_poll(unsigned long unused); |
95 | static DEFINE_TIMER(pdc_console_timer, pdc_console_poll, 0, 0); | |
5dd5bc40 | 96 | static struct tty_port tty_port; |
650a35f8 | 97 | |
650a35f8 GM |
98 | static int pdc_console_tty_open(struct tty_struct *tty, struct file *filp) |
99 | { | |
5dd5bc40 | 100 | tty_port_tty_set(&tty_port, tty); |
650a35f8 GM |
101 | mod_timer(&pdc_console_timer, jiffies + PDC_CONS_POLL_DELAY); |
102 | ||
103 | return 0; | |
104 | } | |
105 | ||
106 | static void pdc_console_tty_close(struct tty_struct *tty, struct file *filp) | |
107 | { | |
49a5f3cf | 108 | if (tty->count == 1) { |
e380a81e | 109 | del_timer_sync(&pdc_console_timer); |
5dd5bc40 JS |
110 | tty_port_tty_set(&tty_port, NULL); |
111 | } | |
650a35f8 GM |
112 | } |
113 | ||
114 | static int pdc_console_tty_write(struct tty_struct *tty, const unsigned char *buf, int count) | |
115 | { | |
116 | pdc_console_write(NULL, buf, count); | |
117 | return count; | |
118 | } | |
119 | ||
120 | static int pdc_console_tty_write_room(struct tty_struct *tty) | |
121 | { | |
122 | return 32768; /* no limit, no buffer used */ | |
123 | } | |
124 | ||
125 | static int pdc_console_tty_chars_in_buffer(struct tty_struct *tty) | |
126 | { | |
127 | return 0; /* no buffer */ | |
128 | } | |
129 | ||
650a35f8 GM |
130 | static const struct tty_operations pdc_console_tty_ops = { |
131 | .open = pdc_console_tty_open, | |
132 | .close = pdc_console_tty_close, | |
133 | .write = pdc_console_tty_write, | |
134 | .write_room = pdc_console_tty_write_room, | |
135 | .chars_in_buffer = pdc_console_tty_chars_in_buffer, | |
136 | }; | |
137 | ||
138 | static void pdc_console_poll(unsigned long unused) | |
139 | { | |
650a35f8 | 140 | int data, count = 0; |
650a35f8 GM |
141 | |
142 | while (1) { | |
143 | data = pdc_console_poll_key(NULL); | |
144 | if (data == -1) | |
145 | break; | |
92a19f9c | 146 | tty_insert_flip_char(&tty_port, data & 0xFF, TTY_NORMAL); |
650a35f8 GM |
147 | count ++; |
148 | } | |
149 | ||
150 | if (count) | |
2e124b4a | 151 | tty_flip_buffer_push(&tty_port); |
5dd5bc40 | 152 | |
e380a81e | 153 | if (pdc_cons.flags & CON_ENABLED) |
650a35f8 GM |
154 | mod_timer(&pdc_console_timer, jiffies + PDC_CONS_POLL_DELAY); |
155 | } | |
156 | ||
5dd5bc40 JS |
157 | static struct tty_driver *pdc_console_tty_driver; |
158 | ||
650a35f8 GM |
159 | static int __init pdc_console_tty_driver_init(void) |
160 | { | |
650a35f8 | 161 | int err; |
650a35f8 GM |
162 | |
163 | /* Check if the console driver is still registered. | |
164 | * It is unregistered if the pdc console was not selected as the | |
165 | * primary console. */ | |
166 | ||
597c606f | 167 | struct console *tmp; |
650a35f8 | 168 | |
ac751efa | 169 | console_lock(); |
597c606f | 170 | for_each_console(tmp) |
650a35f8 GM |
171 | if (tmp == &pdc_cons) |
172 | break; | |
ac751efa | 173 | console_unlock(); |
650a35f8 GM |
174 | |
175 | if (!tmp) { | |
176 | printk(KERN_INFO "PDC console driver not registered anymore, not creating %s\n", pdc_cons.name); | |
177 | return -ENODEV; | |
178 | } | |
179 | ||
180 | printk(KERN_INFO "The PDC console driver is still registered, removing CON_BOOT flag\n"); | |
181 | pdc_cons.flags &= ~CON_BOOT; | |
182 | ||
0b479d54 | 183 | pdc_console_tty_driver = alloc_tty_driver(1); |
650a35f8 | 184 | |
0b479d54 | 185 | if (!pdc_console_tty_driver) |
650a35f8 GM |
186 | return -ENOMEM; |
187 | ||
191c5f10 JS |
188 | tty_port_init(&tty_port); |
189 | ||
0b479d54 JS |
190 | pdc_console_tty_driver->driver_name = "pdc_cons"; |
191 | pdc_console_tty_driver->name = "ttyB"; | |
192 | pdc_console_tty_driver->major = MUX_MAJOR; | |
193 | pdc_console_tty_driver->minor_start = 0; | |
194 | pdc_console_tty_driver->type = TTY_DRIVER_TYPE_SYSTEM; | |
195 | pdc_console_tty_driver->init_termios = tty_std_termios; | |
196 | pdc_console_tty_driver->flags = TTY_DRIVER_REAL_RAW | | |
197 | TTY_DRIVER_RESET_TERMIOS; | |
198 | tty_set_operations(pdc_console_tty_driver, &pdc_console_tty_ops); | |
b19e2ca7 | 199 | tty_port_link_device(&tty_port, pdc_console_tty_driver, 0); |
0b479d54 JS |
200 | |
201 | err = tty_register_driver(pdc_console_tty_driver); | |
650a35f8 GM |
202 | if (err) { |
203 | printk(KERN_ERR "Unable to register the PDC console TTY driver\n"); | |
191c5f10 | 204 | tty_port_destroy(&tty_port); |
650a35f8 GM |
205 | return err; |
206 | } | |
207 | ||
650a35f8 GM |
208 | return 0; |
209 | } | |
210 | ||
211 | module_init(pdc_console_tty_driver_init); | |
a8f340e3 | 212 | |
1da177e4 LT |
213 | static struct tty_driver * pdc_console_device (struct console *c, int *index) |
214 | { | |
650a35f8 GM |
215 | *index = c->index; |
216 | return pdc_console_tty_driver; | |
1da177e4 LT |
217 | } |
218 | #else | |
7c92e972 | 219 | #define pdc_console_device NULL |
1da177e4 LT |
220 | #endif |
221 | ||
222 | static struct console pdc_cons = { | |
223 | .name = "ttyB", | |
224 | .write = pdc_console_write, | |
7c92e972 | 225 | .device = pdc_console_device, |
1da177e4 | 226 | .setup = pdc_console_setup, |
650a35f8 | 227 | .flags = CON_BOOT | CON_PRINTBUFFER, |
1da177e4 LT |
228 | .index = -1, |
229 | }; | |
230 | ||
231 | static int pdc_console_initialized; | |
1da177e4 LT |
232 | |
233 | static void pdc_console_init_force(void) | |
234 | { | |
235 | if (pdc_console_initialized) | |
236 | return; | |
237 | ++pdc_console_initialized; | |
238 | ||
239 | /* If the console is duplex then copy the COUT parameters to CIN. */ | |
240 | if (PAGE0->mem_cons.cl_class == CL_DUPLEX) | |
241 | memcpy(&PAGE0->mem_kbd, &PAGE0->mem_cons, sizeof(PAGE0->mem_cons)); | |
242 | ||
243 | /* register the pdc console */ | |
244 | register_console(&pdc_cons); | |
245 | } | |
246 | ||
247 | void __init pdc_console_init(void) | |
248 | { | |
249 | #if defined(EARLY_BOOTUP_DEBUG) || defined(CONFIG_PDC_CONSOLE) | |
250 | pdc_console_init_force(); | |
251 | #endif | |
252 | #ifdef EARLY_BOOTUP_DEBUG | |
253 | printk(KERN_INFO "Initialized PDC Console for debugging.\n"); | |
254 | #endif | |
255 | } | |
256 | ||
257 | ||
1da177e4 LT |
258 | /* |
259 | * Used for emergencies. Currently only used if an HPMC occurs. If an | |
260 | * HPMC occurs, it is possible that the current console may not be | |
7c92e972 MW |
261 | * properly initialised after the PDC IO reset. This routine unregisters |
262 | * all of the current consoles, reinitializes the pdc console and | |
1da177e4 LT |
263 | * registers it. |
264 | */ | |
265 | ||
266 | void pdc_console_restart(void) | |
267 | { | |
268 | struct console *console; | |
269 | ||
270 | if (pdc_console_initialized) | |
271 | return; | |
272 | ||
7c92e972 MW |
273 | /* If we've already seen the output, don't bother to print it again */ |
274 | if (console_drivers != NULL) | |
275 | pdc_cons.flags &= ~CON_PRINTBUFFER; | |
276 | ||
1da177e4 LT |
277 | while ((console = console_drivers) != NULL) |
278 | unregister_console(console_drivers); | |
279 | ||
1da177e4 LT |
280 | /* force registering the pdc console */ |
281 | pdc_console_init_force(); | |
282 | } |