Merge branch 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6
[linux-3.10.git] / arch / parisc / kernel / pdc_chassis.c
1 /* 
2  *    interfaces to log Chassis Codes via PDC (firmware)
3  *
4  *    Copyright (C) 2002 Laurent Canet <canetl@esiee.fr>
5  *    Copyright (C) 2002-2004 Thibaut VARENE <varenet@parisc-linux.org>
6  *
7  *    This program is free software; you can redistribute it and/or modify
8  *    it under the terms of the GNU General Public License, version 2, as
9  *    published by the Free Software Foundation.
10  *
11  *    This program is distributed in the hope that it will be useful,
12  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
13  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  *    GNU General Public License for more details.
15  *
16  *    You should have received a copy of the GNU General Public License
17  *    along with this program; if not, write to the Free Software
18  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
19  */
20
21 #undef PDC_CHASSIS_DEBUG
22 #ifdef PDC_CHASSIS_DEBUG
23 #define DPRINTK(fmt, args...)   printk(fmt, ## args)
24 #else
25 #define DPRINTK(fmt, args...)
26 #endif
27
28 #include <linux/init.h>
29 #include <linux/kernel.h>
30 #include <linux/reboot.h>
31 #include <linux/notifier.h>
32 #include <linux/cache.h>
33
34 #include <asm/pdc_chassis.h>
35 #include <asm/processor.h>
36 #include <asm/pdc.h>
37 #include <asm/pdcpat.h>
38
39
40 #ifdef CONFIG_PDC_CHASSIS
41 static int pdc_chassis_old __read_mostly = 0;   
42 static unsigned int pdc_chassis_enabled __read_mostly = 1;
43
44
45 /**
46  * pdc_chassis_setup() - Enable/disable pdc_chassis code at boot time.
47  * @str configuration param: 0 to disable chassis log
48  * @return 1
49  */
50  
51 static int __init pdc_chassis_setup(char *str)
52 {
53         /*panic_timeout = simple_strtoul(str, NULL, 0);*/
54         get_option(&str, &pdc_chassis_enabled);
55         return 1;
56 }
57 __setup("pdcchassis=", pdc_chassis_setup);
58
59
60 /** 
61  * pdc_chassis_checkold() - Checks for old PDC_CHASSIS compatibility
62  * @pdc_chassis_old: 1 if old pdc chassis style
63  * 
64  * Currently, only E class and A180 are known to work with this.
65  * Inspired by Christoph Plattner
66  */
67
68 static void __init pdc_chassis_checkold(void)
69 {
70         switch(CPU_HVERSION) {
71                 case 0x480:             /* E25 */
72                 case 0x481:             /* E35 */
73                 case 0x482:             /* E45 */
74                 case 0x483:             /* E55 */
75                 case 0x516:             /* A180 */
76                         pdc_chassis_old = 1;
77                         break;
78
79                 default:
80                         break;
81         }
82         DPRINTK(KERN_DEBUG "%s: pdc_chassis_checkold(); pdc_chassis_old = %d\n", __FILE__, pdc_chassis_old);
83 }
84
85
86 /**
87  * pdc_chassis_panic_event() - Called by the panic handler.
88  *
89  * As soon as a panic occurs, we should inform the PDC.
90  */
91
92 static int pdc_chassis_panic_event(struct notifier_block *this,
93                         unsigned long event, void *ptr)
94 {
95         pdc_chassis_send_status(PDC_CHASSIS_DIRECT_PANIC);
96                 return NOTIFY_DONE;
97 }   
98
99
100 static struct notifier_block pdc_chassis_panic_block = {
101         .notifier_call = pdc_chassis_panic_event,
102         .priority = INT_MAX,
103 };
104
105
106 /**
107  * parisc_reboot_event() - Called by the reboot handler.
108  *
109  * As soon as a reboot occurs, we should inform the PDC.
110  */
111
112 static int pdc_chassis_reboot_event(struct notifier_block *this,
113                         unsigned long event, void *ptr)
114 {
115         pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN);
116                 return NOTIFY_DONE;
117 }   
118
119
120 static struct notifier_block pdc_chassis_reboot_block = {
121         .notifier_call = pdc_chassis_reboot_event,
122         .priority = INT_MAX,
123 };
124 #endif /* CONFIG_PDC_CHASSIS */
125
126
127 /**
128  * parisc_pdc_chassis_init() - Called at boot time.
129  */
130
131 void __init parisc_pdc_chassis_init(void)
132 {
133 #ifdef CONFIG_PDC_CHASSIS
134         int handle = 0;
135         if (likely(pdc_chassis_enabled)) {
136                 DPRINTK(KERN_DEBUG "%s: parisc_pdc_chassis_init()\n", __FILE__);
137
138                 /* Let see if we have something to handle... */
139                 /* Check for PDC_PAT or old LED Panel */
140                 pdc_chassis_checkold();
141                 if (is_pdc_pat()) {
142                         printk(KERN_INFO "Enabling PDC_PAT chassis codes support.\n");
143                         handle = 1;
144                 }
145                 else if (unlikely(pdc_chassis_old)) {
146                         printk(KERN_INFO "Enabling old style chassis LED panel support.\n");
147                         handle = 1;
148                 }
149
150                 if (handle) {
151                         /* initialize panic notifier chain */
152                         atomic_notifier_chain_register(&panic_notifier_list,
153                                         &pdc_chassis_panic_block);
154
155                         /* initialize reboot notifier chain */
156                         register_reboot_notifier(&pdc_chassis_reboot_block);
157                 }
158         }
159 #endif /* CONFIG_PDC_CHASSIS */
160 }
161
162
163 /** 
164  * pdc_chassis_send_status() - Sends a predefined message to the chassis,
165  * and changes the front panel LEDs according to the new system state
166  * @retval: PDC call return value.
167  *
168  * Only machines with 64 bits PDC PAT and those reported in
169  * pdc_chassis_checkold() are supported atm.
170  * 
171  * returns 0 if no error, -1 if no supported PDC is present or invalid message,
172  * else returns the appropriate PDC error code.
173  * 
174  * For a list of predefined messages, see asm-parisc/pdc_chassis.h
175  */
176
177 int pdc_chassis_send_status(int message)
178 {
179         /* Maybe we should do that in an other way ? */
180         int retval = 0;
181 #ifdef CONFIG_PDC_CHASSIS
182         if (likely(pdc_chassis_enabled)) {
183
184                 DPRINTK(KERN_DEBUG "%s: pdc_chassis_send_status(%d)\n", __FILE__, message);
185
186 #ifdef CONFIG_64BIT
187                 if (is_pdc_pat()) {
188                         switch(message) {
189                                 case PDC_CHASSIS_DIRECT_BSTART:
190                                         retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_BSTART, PDC_CHASSIS_LSTATE_RUN_NORMAL);
191                                         break;
192
193                                 case PDC_CHASSIS_DIRECT_BCOMPLETE:
194                                         retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_BCOMPLETE, PDC_CHASSIS_LSTATE_RUN_NORMAL);
195                                         break;
196
197                                 case PDC_CHASSIS_DIRECT_SHUTDOWN:
198                                         retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_SHUTDOWN, PDC_CHASSIS_LSTATE_NONOS);
199                                         break;
200
201                                 case PDC_CHASSIS_DIRECT_PANIC:
202                                         retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_PANIC, PDC_CHASSIS_LSTATE_RUN_CRASHREC);
203                                         break;
204
205                                 case PDC_CHASSIS_DIRECT_LPMC:
206                                         retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_LPMC, PDC_CHASSIS_LSTATE_RUN_SYSINT);
207                                         break;
208
209                                 case PDC_CHASSIS_DIRECT_HPMC:
210                                         retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_HPMC, PDC_CHASSIS_LSTATE_RUN_NCRIT);
211                                         break;
212
213                                 default:
214                                         retval = -1;
215                         }
216                 } else retval = -1;
217 #else
218                 if (unlikely(pdc_chassis_old)) {
219                         switch (message) {
220                                 case PDC_CHASSIS_DIRECT_BSTART:
221                                 case PDC_CHASSIS_DIRECT_BCOMPLETE:
222                                         retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_RUN));
223                                         break;
224
225                                 case PDC_CHASSIS_DIRECT_SHUTDOWN:
226                                         retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_SHUT));
227                                         break;
228
229                                 case PDC_CHASSIS_DIRECT_HPMC:
230                                 case PDC_CHASSIS_DIRECT_PANIC:
231                                         retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_FLT));
232                                         break;
233
234                                 case PDC_CHASSIS_DIRECT_LPMC:
235                                         retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_WARN));
236                                         break;
237
238                                 default:
239                                         retval = -1;
240                         }
241                 } else retval = -1;
242 #endif /* CONFIG_64BIT */
243         }       /* if (pdc_chassis_enabled) */
244 #endif /* CONFIG_PDC_CHASSIS */
245         return retval;
246 }