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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> | |
1da177e4 LT |
53 | #include <asm/pdc.h> /* for iodc_call() proto and friends */ |
54 | ||
aefa8b6b | 55 | static DEFINE_SPINLOCK(pdc_console_lock); |
650a35f8 | 56 | static struct console pdc_cons; |
1da177e4 LT |
57 | |
58 | static void pdc_console_write(struct console *co, const char *s, unsigned count) | |
59 | { | |
ef1afd4d KM |
60 | int i = 0; |
61 | unsigned long flags; | |
62 | ||
63 | spin_lock_irqsave(&pdc_console_lock, flags); | |
64 | do { | |
65 | i += pdc_iodc_print(s + i, count - i); | |
66 | } while (i < count); | |
67 | spin_unlock_irqrestore(&pdc_console_lock, flags); | |
1da177e4 LT |
68 | } |
69 | ||
1da177e4 LT |
70 | int pdc_console_poll_key(struct console *co) |
71 | { | |
ef1afd4d KM |
72 | int c; |
73 | unsigned long flags; | |
74 | ||
75 | spin_lock_irqsave(&pdc_console_lock, flags); | |
76 | c = pdc_iodc_getc(); | |
77 | spin_unlock_irqrestore(&pdc_console_lock, flags); | |
78 | ||
79 | return c; | |
1da177e4 LT |
80 | } |
81 | ||
82 | static int pdc_console_setup(struct console *co, char *options) | |
83 | { | |
84 | return 0; | |
85 | } | |
86 | ||
87 | #if defined(CONFIG_PDC_CONSOLE) | |
a8f340e3 | 88 | #include <linux/vt_kern.h> |
650a35f8 GM |
89 | #include <linux/tty_flip.h> |
90 | ||
91 | #define PDC_CONS_POLL_DELAY (30 * HZ / 1000) | |
92 | ||
93 | static struct timer_list pdc_console_timer; | |
94 | ||
95 | extern struct console * console_drivers; | |
96 | ||
97 | static int pdc_console_tty_open(struct tty_struct *tty, struct file *filp) | |
98 | { | |
99 | ||
100 | mod_timer(&pdc_console_timer, jiffies + PDC_CONS_POLL_DELAY); | |
101 | ||
102 | return 0; | |
103 | } | |
104 | ||
105 | static void pdc_console_tty_close(struct tty_struct *tty, struct file *filp) | |
106 | { | |
107 | if (!tty->count) | |
108 | del_timer(&pdc_console_timer); | |
109 | } | |
110 | ||
111 | static int pdc_console_tty_write(struct tty_struct *tty, const unsigned char *buf, int count) | |
112 | { | |
113 | pdc_console_write(NULL, buf, count); | |
114 | return count; | |
115 | } | |
116 | ||
117 | static int pdc_console_tty_write_room(struct tty_struct *tty) | |
118 | { | |
119 | return 32768; /* no limit, no buffer used */ | |
120 | } | |
121 | ||
122 | static int pdc_console_tty_chars_in_buffer(struct tty_struct *tty) | |
123 | { | |
124 | return 0; /* no buffer */ | |
125 | } | |
126 | ||
127 | static struct tty_driver *pdc_console_tty_driver; | |
128 | ||
129 | static const struct tty_operations pdc_console_tty_ops = { | |
130 | .open = pdc_console_tty_open, | |
131 | .close = pdc_console_tty_close, | |
132 | .write = pdc_console_tty_write, | |
133 | .write_room = pdc_console_tty_write_room, | |
134 | .chars_in_buffer = pdc_console_tty_chars_in_buffer, | |
135 | }; | |
136 | ||
137 | static void pdc_console_poll(unsigned long unused) | |
138 | { | |
139 | ||
140 | int data, count = 0; | |
141 | ||
142 | struct tty_struct *tty = pdc_console_tty_driver->ttys[0]; | |
143 | ||
144 | if (!tty) | |
145 | return; | |
146 | ||
147 | while (1) { | |
148 | data = pdc_console_poll_key(NULL); | |
149 | if (data == -1) | |
150 | break; | |
151 | tty_insert_flip_char(tty, data & 0xFF, TTY_NORMAL); | |
152 | count ++; | |
153 | } | |
154 | ||
155 | if (count) | |
156 | tty_flip_buffer_push(tty); | |
157 | ||
158 | if (tty->count && (pdc_cons.flags & CON_ENABLED)) | |
159 | mod_timer(&pdc_console_timer, jiffies + PDC_CONS_POLL_DELAY); | |
160 | } | |
161 | ||
162 | static int __init pdc_console_tty_driver_init(void) | |
163 | { | |
164 | ||
165 | int err; | |
166 | struct tty_driver *drv; | |
167 | ||
168 | /* Check if the console driver is still registered. | |
169 | * It is unregistered if the pdc console was not selected as the | |
170 | * primary console. */ | |
171 | ||
172 | struct console *tmp = console_drivers; | |
173 | ||
174 | for (tmp = console_drivers; tmp; tmp = tmp->next) | |
175 | if (tmp == &pdc_cons) | |
176 | break; | |
177 | ||
178 | if (!tmp) { | |
179 | printk(KERN_INFO "PDC console driver not registered anymore, not creating %s\n", pdc_cons.name); | |
180 | return -ENODEV; | |
181 | } | |
182 | ||
183 | printk(KERN_INFO "The PDC console driver is still registered, removing CON_BOOT flag\n"); | |
184 | pdc_cons.flags &= ~CON_BOOT; | |
185 | ||
186 | drv = alloc_tty_driver(1); | |
187 | ||
188 | if (!drv) | |
189 | return -ENOMEM; | |
190 | ||
191 | drv->driver_name = "pdc_cons"; | |
192 | drv->name = "ttyB"; | |
193 | drv->major = MUX_MAJOR; | |
194 | drv->minor_start = 0; | |
195 | drv->type = TTY_DRIVER_TYPE_SYSTEM; | |
196 | drv->init_termios = tty_std_termios; | |
197 | drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS; | |
198 | tty_set_operations(drv, &pdc_console_tty_ops); | |
199 | ||
200 | err = tty_register_driver(drv); | |
201 | if (err) { | |
202 | printk(KERN_ERR "Unable to register the PDC console TTY driver\n"); | |
203 | return err; | |
204 | } | |
205 | ||
206 | pdc_console_tty_driver = drv; | |
207 | ||
208 | /* No need to initialize the pdc_console_timer if tty isn't allocated */ | |
209 | init_timer(&pdc_console_timer); | |
210 | pdc_console_timer.function = pdc_console_poll; | |
211 | ||
212 | return 0; | |
213 | } | |
214 | ||
215 | module_init(pdc_console_tty_driver_init); | |
a8f340e3 | 216 | |
1da177e4 LT |
217 | static struct tty_driver * pdc_console_device (struct console *c, int *index) |
218 | { | |
650a35f8 GM |
219 | *index = c->index; |
220 | return pdc_console_tty_driver; | |
1da177e4 LT |
221 | } |
222 | #else | |
7c92e972 | 223 | #define pdc_console_device NULL |
1da177e4 LT |
224 | #endif |
225 | ||
226 | static struct console pdc_cons = { | |
227 | .name = "ttyB", | |
228 | .write = pdc_console_write, | |
7c92e972 | 229 | .device = pdc_console_device, |
1da177e4 | 230 | .setup = pdc_console_setup, |
650a35f8 | 231 | .flags = CON_BOOT | CON_PRINTBUFFER, |
1da177e4 LT |
232 | .index = -1, |
233 | }; | |
234 | ||
235 | static int pdc_console_initialized; | |
1da177e4 LT |
236 | |
237 | static void pdc_console_init_force(void) | |
238 | { | |
239 | if (pdc_console_initialized) | |
240 | return; | |
241 | ++pdc_console_initialized; | |
242 | ||
243 | /* If the console is duplex then copy the COUT parameters to CIN. */ | |
244 | if (PAGE0->mem_cons.cl_class == CL_DUPLEX) | |
245 | memcpy(&PAGE0->mem_kbd, &PAGE0->mem_cons, sizeof(PAGE0->mem_cons)); | |
246 | ||
247 | /* register the pdc console */ | |
248 | register_console(&pdc_cons); | |
249 | } | |
250 | ||
251 | void __init pdc_console_init(void) | |
252 | { | |
253 | #if defined(EARLY_BOOTUP_DEBUG) || defined(CONFIG_PDC_CONSOLE) | |
254 | pdc_console_init_force(); | |
255 | #endif | |
256 | #ifdef EARLY_BOOTUP_DEBUG | |
257 | printk(KERN_INFO "Initialized PDC Console for debugging.\n"); | |
258 | #endif | |
259 | } | |
260 | ||
261 | ||
1da177e4 LT |
262 | /* |
263 | * Used for emergencies. Currently only used if an HPMC occurs. If an | |
264 | * HPMC occurs, it is possible that the current console may not be | |
7c92e972 MW |
265 | * properly initialised after the PDC IO reset. This routine unregisters |
266 | * all of the current consoles, reinitializes the pdc console and | |
1da177e4 LT |
267 | * registers it. |
268 | */ | |
269 | ||
270 | void pdc_console_restart(void) | |
271 | { | |
272 | struct console *console; | |
273 | ||
274 | if (pdc_console_initialized) | |
275 | return; | |
276 | ||
7c92e972 MW |
277 | /* If we've already seen the output, don't bother to print it again */ |
278 | if (console_drivers != NULL) | |
279 | pdc_cons.flags &= ~CON_PRINTBUFFER; | |
280 | ||
1da177e4 LT |
281 | while ((console = console_drivers) != NULL) |
282 | unregister_console(console_drivers); | |
283 | ||
1da177e4 LT |
284 | /* force registering the pdc console */ |
285 | pdc_console_init_force(); | |
286 | } |