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Linux/arch/parisc/kernel/pdc_cons.c

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  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  *    Copyright (C) 2010 Guy Martin <gmsoft at tuxicoman.be>
 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 
 35  *  boot related problems on HP PA-RISC machines. It is also useful when no
 36  *  other console works.
 37  *
 38  *  This code uses the ROM (=PDC) based functions to read and write characters
 39  *  from and to PDC's boot path.
 40  */
 41 
 42 /* Define EARLY_BOOTUP_DEBUG to debug kernel related boot problems. 
 43  * On production kernels EARLY_BOOTUP_DEBUG should be undefined. */
 44 #define EARLY_BOOTUP_DEBUG
 45 
 46 
 47 #include <linux/kernel.h>
 48 #include <linux/console.h>
 49 #include <linux/string.h>
 50 #include <linux/init.h>
 51 #include <linux/major.h>
 52 #include <linux/tty.h>
 53 #include <asm/page.h>           /* for PAGE0 */
 54 #include <asm/pdc.h>            /* for iodc_call() proto and friends */
 55 
 56 static DEFINE_SPINLOCK(pdc_console_lock);
 57 static struct console pdc_cons;
 58 
 59 static void pdc_console_write(struct console *co, const char *s, unsigned count)
 60 {
 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);
 69 }
 70 
 71 int pdc_console_poll_key(struct console *co)
 72 {
 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;
 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)
 89 #include <linux/vt_kern.h>
 90 #include <linux/tty_flip.h>
 91 
 92 #define PDC_CONS_POLL_DELAY (30 * HZ / 1000)
 93 
 94 static void pdc_console_poll(struct timer_list *unused);
 95 static DEFINE_TIMER(pdc_console_timer, pdc_console_poll);
 96 static struct tty_port tty_port;
 97 
 98 static int pdc_console_tty_open(struct tty_struct *tty, struct file *filp)
 99 {
100         tty_port_tty_set(&tty_port, tty);
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 {
108         if (tty->count == 1) {
109                 del_timer_sync(&pdc_console_timer);
110                 tty_port_tty_set(&tty_port, NULL);
111         }
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 
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(struct timer_list *unused)
139 {
140         int data, count = 0;
141 
142         while (1) {
143                 data = pdc_console_poll_key(NULL);
144                 if (data == -1)
145                         break;
146                 tty_insert_flip_char(&tty_port, data & 0xFF, TTY_NORMAL);
147                 count ++;
148         }
149 
150         if (count)
151                 tty_flip_buffer_push(&tty_port);
152 
153         if (pdc_cons.flags & CON_ENABLED)
154                 mod_timer(&pdc_console_timer, jiffies + PDC_CONS_POLL_DELAY);
155 }
156 
157 static struct tty_driver *pdc_console_tty_driver;
158 
159 static int __init pdc_console_tty_driver_init(void)
160 {
161         int err;
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 
167         struct console *tmp;
168 
169         console_lock();
170         for_each_console(tmp)
171                 if (tmp == &pdc_cons)
172                         break;
173         console_unlock();
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 
183         pdc_console_tty_driver = alloc_tty_driver(1);
184 
185         if (!pdc_console_tty_driver)
186                 return -ENOMEM;
187 
188         tty_port_init(&tty_port);
189 
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);
199         tty_port_link_device(&tty_port, pdc_console_tty_driver, 0);
200 
201         err = tty_register_driver(pdc_console_tty_driver);
202         if (err) {
203                 printk(KERN_ERR "Unable to register the PDC console TTY driver\n");
204                 tty_port_destroy(&tty_port);
205                 return err;
206         }
207 
208         return 0;
209 }
210 device_initcall(pdc_console_tty_driver_init);
211 
212 static struct tty_driver * pdc_console_device (struct console *c, int *index)
213 {
214         *index = c->index;
215         return pdc_console_tty_driver;
216 }
217 #else
218 #define pdc_console_device NULL
219 #endif
220 
221 static struct console pdc_cons = {
222         .name =         "ttyB",
223         .write =        pdc_console_write,
224         .device =       pdc_console_device,
225         .setup =        pdc_console_setup,
226         .flags =        CON_BOOT | CON_PRINTBUFFER,
227         .index =        -1,
228 };
229 
230 static int pdc_console_initialized;
231 
232 static void pdc_console_init_force(void)
233 {
234         if (pdc_console_initialized)
235                 return;
236         ++pdc_console_initialized;
237         
238         /* If the console is duplex then copy the COUT parameters to CIN. */
239         if (PAGE0->mem_cons.cl_class == CL_DUPLEX)
240                 memcpy(&PAGE0->mem_kbd, &PAGE0->mem_cons, sizeof(PAGE0->mem_cons));
241 
242         /* register the pdc console */
243         register_console(&pdc_cons);
244 }
245 
246 void __init pdc_console_init(void)
247 {
248 #if defined(EARLY_BOOTUP_DEBUG) || defined(CONFIG_PDC_CONSOLE)
249         pdc_console_init_force();
250 #endif
251 #ifdef EARLY_BOOTUP_DEBUG
252         printk(KERN_INFO "Initialized PDC Console for debugging.\n");
253 #endif
254 }
255 
256 
257 /*
258  * Used for emergencies. Currently only used if an HPMC occurs. If an
259  * HPMC occurs, it is possible that the current console may not be
260  * properly initialised after the PDC IO reset. This routine unregisters
261  * all of the current consoles, reinitializes the pdc console and
262  * registers it.
263  */
264 
265 void pdc_console_restart(void)
266 {
267         struct console *console;
268 
269         if (pdc_console_initialized)
270                 return;
271 
272         /* If we've already seen the output, don't bother to print it again */
273         if (console_drivers != NULL)
274                 pdc_cons.flags &= ~CON_PRINTBUFFER;
275 
276         while ((console = console_drivers) != NULL)
277                 unregister_console(console_drivers);
278 
279         /* force registering the pdc console */
280         pdc_console_init_force();
281 }
282 

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