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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> | |
15 | * | |
16 | * | |
17 | * This program is free software; you can redistribute it and/or modify | |
18 | * it under the terms of the GNU General Public License as published by | |
19 | * the Free Software Foundation; either version 2 of the License, or | |
20 | * (at your option) any later version. | |
21 | * | |
22 | * This program is distributed in the hope that it will be useful, | |
23 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
24 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
25 | * GNU General Public License for more details. | |
26 | * | |
27 | * You should have received a copy of the GNU General Public License | |
28 | * along with this program; if not, write to the Free Software | |
29 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
30 | */ | |
31 | ||
32 | /* | |
33 | * The PDC console is a simple console, which can be used for debugging | |
34 | * boot related problems on HP PA-RISC machines. | |
35 | * | |
36 | * This code uses the ROM (=PDC) based functions to read and write characters | |
37 | * from and to PDC's boot path. | |
38 | * Since all character read from that path must be polled, this code never | |
39 | * can or will be a fully functional linux console. | |
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 | ||
ef1afd4d | 55 | static spinlock_t pdc_console_lock = SPIN_LOCK_UNLOCKED; |
1da177e4 LT |
56 | |
57 | static void pdc_console_write(struct console *co, const char *s, unsigned count) | |
58 | { | |
ef1afd4d KM |
59 | int i = 0; |
60 | unsigned long flags; | |
61 | ||
62 | spin_lock_irqsave(&pdc_console_lock, flags); | |
63 | do { | |
64 | i += pdc_iodc_print(s + i, count - i); | |
65 | } while (i < count); | |
66 | spin_unlock_irqrestore(&pdc_console_lock, flags); | |
1da177e4 LT |
67 | } |
68 | ||
1da177e4 LT |
69 | int pdc_console_poll_key(struct console *co) |
70 | { | |
ef1afd4d KM |
71 | int c; |
72 | unsigned long flags; | |
73 | ||
74 | spin_lock_irqsave(&pdc_console_lock, flags); | |
75 | c = pdc_iodc_getc(); | |
76 | spin_unlock_irqrestore(&pdc_console_lock, flags); | |
77 | ||
78 | return c; | |
1da177e4 LT |
79 | } |
80 | ||
81 | static int pdc_console_setup(struct console *co, char *options) | |
82 | { | |
83 | return 0; | |
84 | } | |
85 | ||
86 | #if defined(CONFIG_PDC_CONSOLE) | |
a8f340e3 JS |
87 | #include <linux/vt_kern.h> |
88 | ||
1da177e4 LT |
89 | static struct tty_driver * pdc_console_device (struct console *c, int *index) |
90 | { | |
91 | extern struct tty_driver console_driver; | |
92 | *index = c->index ? c->index-1 : fg_console; | |
93 | return &console_driver; | |
94 | } | |
95 | #else | |
7c92e972 | 96 | #define pdc_console_device NULL |
1da177e4 LT |
97 | #endif |
98 | ||
99 | static struct console pdc_cons = { | |
100 | .name = "ttyB", | |
101 | .write = pdc_console_write, | |
7c92e972 | 102 | .device = pdc_console_device, |
1da177e4 | 103 | .setup = pdc_console_setup, |
7c92e972 | 104 | .flags = CON_BOOT | CON_PRINTBUFFER | CON_ENABLED, |
1da177e4 LT |
105 | .index = -1, |
106 | }; | |
107 | ||
108 | static int pdc_console_initialized; | |
1da177e4 LT |
109 | |
110 | static void pdc_console_init_force(void) | |
111 | { | |
112 | if (pdc_console_initialized) | |
113 | return; | |
114 | ++pdc_console_initialized; | |
115 | ||
116 | /* If the console is duplex then copy the COUT parameters to CIN. */ | |
117 | if (PAGE0->mem_cons.cl_class == CL_DUPLEX) | |
118 | memcpy(&PAGE0->mem_kbd, &PAGE0->mem_cons, sizeof(PAGE0->mem_cons)); | |
119 | ||
120 | /* register the pdc console */ | |
121 | register_console(&pdc_cons); | |
122 | } | |
123 | ||
124 | void __init pdc_console_init(void) | |
125 | { | |
126 | #if defined(EARLY_BOOTUP_DEBUG) || defined(CONFIG_PDC_CONSOLE) | |
127 | pdc_console_init_force(); | |
128 | #endif | |
129 | #ifdef EARLY_BOOTUP_DEBUG | |
130 | printk(KERN_INFO "Initialized PDC Console for debugging.\n"); | |
131 | #endif | |
132 | } | |
133 | ||
134 | ||
1da177e4 LT |
135 | /* |
136 | * Used for emergencies. Currently only used if an HPMC occurs. If an | |
137 | * HPMC occurs, it is possible that the current console may not be | |
7c92e972 MW |
138 | * properly initialised after the PDC IO reset. This routine unregisters |
139 | * all of the current consoles, reinitializes the pdc console and | |
1da177e4 LT |
140 | * registers it. |
141 | */ | |
142 | ||
143 | void pdc_console_restart(void) | |
144 | { | |
145 | struct console *console; | |
146 | ||
147 | if (pdc_console_initialized) | |
148 | return; | |
149 | ||
7c92e972 MW |
150 | /* If we've already seen the output, don't bother to print it again */ |
151 | if (console_drivers != NULL) | |
152 | pdc_cons.flags &= ~CON_PRINTBUFFER; | |
153 | ||
1da177e4 LT |
154 | while ((console = console_drivers) != NULL) |
155 | unregister_console(console_drivers); | |
156 | ||
1da177e4 LT |
157 | /* force registering the pdc console */ |
158 | pdc_console_init_force(); | |
159 | } |