]>
Commit | Line | Data |
---|---|---|
1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * PDC Console support - ie use firmware to dump text via boot console | |
4 | * | |
5 | * Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org> | |
6 | * Copyright (C) 2000 Martin K Petersen <mkp at mkp.net> | |
7 | * Copyright (C) 2000 John Marvin <jsm at parisc-linux.org> | |
8 | * Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org> | |
9 | * Copyright (C) 2000 Philipp Rumpf <prumpf with tux.org> | |
10 | * Copyright (C) 2000 Michael Ang <mang with subcarrier.org> | |
11 | * Copyright (C) 2000 Grant Grundler <grundler with parisc-linux.org> | |
12 | * Copyright (C) 2001-2002 Ryan Bradetich <rbrad at parisc-linux.org> | |
13 | * Copyright (C) 2001 Helge Deller <deller at parisc-linux.org> | |
14 | * Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org> | |
15 | * Copyright (C) 2002 Randolph Chung <tausq with parisc-linux.org> | |
650a35f8 | 16 | * Copyright (C) 2010 Guy Martin <gmsoft at tuxicoman.be> |
1da177e4 LT |
17 | */ |
18 | ||
19 | /* | |
20 | * The PDC console is a simple console, which can be used for debugging | |
650a35f8 GM |
21 | * boot related problems on HP PA-RISC machines. It is also useful when no |
22 | * other console works. | |
1da177e4 LT |
23 | * |
24 | * This code uses the ROM (=PDC) based functions to read and write characters | |
25 | * from and to PDC's boot path. | |
1da177e4 LT |
26 | */ |
27 | ||
28 | /* Define EARLY_BOOTUP_DEBUG to debug kernel related boot problems. | |
29 | * On production kernels EARLY_BOOTUP_DEBUG should be undefined. */ | |
7c92e972 | 30 | #define EARLY_BOOTUP_DEBUG |
1da177e4 LT |
31 | |
32 | ||
1da177e4 LT |
33 | #include <linux/kernel.h> |
34 | #include <linux/console.h> | |
35 | #include <linux/string.h> | |
36 | #include <linux/init.h> | |
1da177e4 LT |
37 | #include <linux/major.h> |
38 | #include <linux/tty.h> | |
4a8a0788 | 39 | #include <asm/page.h> /* for PAGE0 */ |
1da177e4 LT |
40 | #include <asm/pdc.h> /* for iodc_call() proto and friends */ |
41 | ||
aefa8b6b | 42 | static DEFINE_SPINLOCK(pdc_console_lock); |
650a35f8 | 43 | static struct console pdc_cons; |
1da177e4 LT |
44 | |
45 | static void pdc_console_write(struct console *co, const char *s, unsigned count) | |
46 | { | |
ef1afd4d KM |
47 | int i = 0; |
48 | unsigned long flags; | |
49 | ||
50 | spin_lock_irqsave(&pdc_console_lock, flags); | |
51 | do { | |
52 | i += pdc_iodc_print(s + i, count - i); | |
53 | } while (i < count); | |
54 | spin_unlock_irqrestore(&pdc_console_lock, flags); | |
1da177e4 LT |
55 | } |
56 | ||
1da177e4 LT |
57 | int pdc_console_poll_key(struct console *co) |
58 | { | |
ef1afd4d KM |
59 | int c; |
60 | unsigned long flags; | |
61 | ||
62 | spin_lock_irqsave(&pdc_console_lock, flags); | |
63 | c = pdc_iodc_getc(); | |
64 | spin_unlock_irqrestore(&pdc_console_lock, flags); | |
65 | ||
66 | return c; | |
1da177e4 LT |
67 | } |
68 | ||
69 | static int pdc_console_setup(struct console *co, char *options) | |
70 | { | |
71 | return 0; | |
72 | } | |
73 | ||
74 | #if defined(CONFIG_PDC_CONSOLE) | |
a8f340e3 | 75 | #include <linux/vt_kern.h> |
650a35f8 GM |
76 | #include <linux/tty_flip.h> |
77 | ||
78 | #define PDC_CONS_POLL_DELAY (30 * HZ / 1000) | |
79 | ||
24ed960a | 80 | static void pdc_console_poll(struct timer_list *unused); |
1d27e3e2 | 81 | static DEFINE_TIMER(pdc_console_timer, pdc_console_poll); |
5dd5bc40 | 82 | static struct tty_port tty_port; |
650a35f8 | 83 | |
650a35f8 GM |
84 | static int pdc_console_tty_open(struct tty_struct *tty, struct file *filp) |
85 | { | |
5dd5bc40 | 86 | tty_port_tty_set(&tty_port, tty); |
650a35f8 GM |
87 | mod_timer(&pdc_console_timer, jiffies + PDC_CONS_POLL_DELAY); |
88 | ||
89 | return 0; | |
90 | } | |
91 | ||
92 | static void pdc_console_tty_close(struct tty_struct *tty, struct file *filp) | |
93 | { | |
49a5f3cf | 94 | if (tty->count == 1) { |
e380a81e | 95 | del_timer_sync(&pdc_console_timer); |
5dd5bc40 JS |
96 | tty_port_tty_set(&tty_port, NULL); |
97 | } | |
650a35f8 GM |
98 | } |
99 | ||
100 | static int pdc_console_tty_write(struct tty_struct *tty, const unsigned char *buf, int count) | |
101 | { | |
102 | pdc_console_write(NULL, buf, count); | |
103 | return count; | |
104 | } | |
105 | ||
106 | static int pdc_console_tty_write_room(struct tty_struct *tty) | |
107 | { | |
108 | return 32768; /* no limit, no buffer used */ | |
109 | } | |
110 | ||
111 | static int pdc_console_tty_chars_in_buffer(struct tty_struct *tty) | |
112 | { | |
113 | return 0; /* no buffer */ | |
114 | } | |
115 | ||
650a35f8 GM |
116 | static const struct tty_operations pdc_console_tty_ops = { |
117 | .open = pdc_console_tty_open, | |
118 | .close = pdc_console_tty_close, | |
119 | .write = pdc_console_tty_write, | |
120 | .write_room = pdc_console_tty_write_room, | |
121 | .chars_in_buffer = pdc_console_tty_chars_in_buffer, | |
122 | }; | |
123 | ||
24ed960a | 124 | static void pdc_console_poll(struct timer_list *unused) |
650a35f8 | 125 | { |
650a35f8 | 126 | int data, count = 0; |
650a35f8 GM |
127 | |
128 | while (1) { | |
129 | data = pdc_console_poll_key(NULL); | |
130 | if (data == -1) | |
131 | break; | |
92a19f9c | 132 | tty_insert_flip_char(&tty_port, data & 0xFF, TTY_NORMAL); |
650a35f8 GM |
133 | count ++; |
134 | } | |
135 | ||
136 | if (count) | |
2e124b4a | 137 | tty_flip_buffer_push(&tty_port); |
5dd5bc40 | 138 | |
e380a81e | 139 | if (pdc_cons.flags & CON_ENABLED) |
650a35f8 GM |
140 | mod_timer(&pdc_console_timer, jiffies + PDC_CONS_POLL_DELAY); |
141 | } | |
142 | ||
5dd5bc40 JS |
143 | static struct tty_driver *pdc_console_tty_driver; |
144 | ||
650a35f8 GM |
145 | static int __init pdc_console_tty_driver_init(void) |
146 | { | |
650a35f8 | 147 | int err; |
650a35f8 GM |
148 | |
149 | /* Check if the console driver is still registered. | |
150 | * It is unregistered if the pdc console was not selected as the | |
151 | * primary console. */ | |
152 | ||
597c606f | 153 | struct console *tmp; |
650a35f8 | 154 | |
ac751efa | 155 | console_lock(); |
597c606f | 156 | for_each_console(tmp) |
650a35f8 GM |
157 | if (tmp == &pdc_cons) |
158 | break; | |
ac751efa | 159 | console_unlock(); |
650a35f8 GM |
160 | |
161 | if (!tmp) { | |
162 | printk(KERN_INFO "PDC console driver not registered anymore, not creating %s\n", pdc_cons.name); | |
163 | return -ENODEV; | |
164 | } | |
165 | ||
166 | printk(KERN_INFO "The PDC console driver is still registered, removing CON_BOOT flag\n"); | |
167 | pdc_cons.flags &= ~CON_BOOT; | |
168 | ||
0b479d54 | 169 | pdc_console_tty_driver = alloc_tty_driver(1); |
650a35f8 | 170 | |
0b479d54 | 171 | if (!pdc_console_tty_driver) |
650a35f8 GM |
172 | return -ENOMEM; |
173 | ||
191c5f10 JS |
174 | tty_port_init(&tty_port); |
175 | ||
0b479d54 JS |
176 | pdc_console_tty_driver->driver_name = "pdc_cons"; |
177 | pdc_console_tty_driver->name = "ttyB"; | |
178 | pdc_console_tty_driver->major = MUX_MAJOR; | |
179 | pdc_console_tty_driver->minor_start = 0; | |
180 | pdc_console_tty_driver->type = TTY_DRIVER_TYPE_SYSTEM; | |
181 | pdc_console_tty_driver->init_termios = tty_std_termios; | |
182 | pdc_console_tty_driver->flags = TTY_DRIVER_REAL_RAW | | |
183 | TTY_DRIVER_RESET_TERMIOS; | |
184 | tty_set_operations(pdc_console_tty_driver, &pdc_console_tty_ops); | |
b19e2ca7 | 185 | tty_port_link_device(&tty_port, pdc_console_tty_driver, 0); |
0b479d54 JS |
186 | |
187 | err = tty_register_driver(pdc_console_tty_driver); | |
650a35f8 GM |
188 | if (err) { |
189 | printk(KERN_ERR "Unable to register the PDC console TTY driver\n"); | |
191c5f10 | 190 | tty_port_destroy(&tty_port); |
650a35f8 GM |
191 | return err; |
192 | } | |
193 | ||
650a35f8 GM |
194 | return 0; |
195 | } | |
aed6850a | 196 | device_initcall(pdc_console_tty_driver_init); |
a8f340e3 | 197 | |
1da177e4 LT |
198 | static struct tty_driver * pdc_console_device (struct console *c, int *index) |
199 | { | |
650a35f8 GM |
200 | *index = c->index; |
201 | return pdc_console_tty_driver; | |
1da177e4 LT |
202 | } |
203 | #else | |
7c92e972 | 204 | #define pdc_console_device NULL |
1da177e4 LT |
205 | #endif |
206 | ||
207 | static struct console pdc_cons = { | |
208 | .name = "ttyB", | |
209 | .write = pdc_console_write, | |
7c92e972 | 210 | .device = pdc_console_device, |
1da177e4 | 211 | .setup = pdc_console_setup, |
650a35f8 | 212 | .flags = CON_BOOT | CON_PRINTBUFFER, |
1da177e4 LT |
213 | .index = -1, |
214 | }; | |
215 | ||
216 | static int pdc_console_initialized; | |
1da177e4 LT |
217 | |
218 | static void pdc_console_init_force(void) | |
219 | { | |
220 | if (pdc_console_initialized) | |
221 | return; | |
222 | ++pdc_console_initialized; | |
223 | ||
224 | /* If the console is duplex then copy the COUT parameters to CIN. */ | |
225 | if (PAGE0->mem_cons.cl_class == CL_DUPLEX) | |
226 | memcpy(&PAGE0->mem_kbd, &PAGE0->mem_cons, sizeof(PAGE0->mem_cons)); | |
227 | ||
228 | /* register the pdc console */ | |
229 | register_console(&pdc_cons); | |
230 | } | |
231 | ||
232 | void __init pdc_console_init(void) | |
233 | { | |
234 | #if defined(EARLY_BOOTUP_DEBUG) || defined(CONFIG_PDC_CONSOLE) | |
235 | pdc_console_init_force(); | |
236 | #endif | |
237 | #ifdef EARLY_BOOTUP_DEBUG | |
238 | printk(KERN_INFO "Initialized PDC Console for debugging.\n"); | |
239 | #endif | |
240 | } | |
241 | ||
242 | ||
1da177e4 LT |
243 | /* |
244 | * Used for emergencies. Currently only used if an HPMC occurs. If an | |
245 | * HPMC occurs, it is possible that the current console may not be | |
7c92e972 MW |
246 | * properly initialised after the PDC IO reset. This routine unregisters |
247 | * all of the current consoles, reinitializes the pdc console and | |
1da177e4 LT |
248 | * registers it. |
249 | */ | |
250 | ||
251 | void pdc_console_restart(void) | |
252 | { | |
253 | struct console *console; | |
254 | ||
255 | if (pdc_console_initialized) | |
256 | return; | |
257 | ||
7c92e972 MW |
258 | /* If we've already seen the output, don't bother to print it again */ |
259 | if (console_drivers != NULL) | |
260 | pdc_cons.flags &= ~CON_PRINTBUFFER; | |
261 | ||
1da177e4 LT |
262 | while ((console = console_drivers) != NULL) |
263 | unregister_console(console_drivers); | |
264 | ||
1da177e4 LT |
265 | /* force registering the pdc console */ |
266 | pdc_console_init_force(); | |
267 | } |