release/src-rt-6.x/linux/linux-2.6/arch/parisc/kernel/pdc_chassis.c

   1 /*
   2  *    interfaces to Chassis Codes via PDC (firmware)
   3  *
   4  *    Copyright (C) 2002 Laurent Canet <canetl@esiee.fr>
   5  *    Copyright (C) 2002-2006 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  *    TODO: poll chassis warns, trigger (configurable) machine shutdown when
  21  *              needed.
  22  *          Find out how to get Chassis warnings out of PAT boxes?
  23  */
  24
  25 #undef PDC_CHASSIS_DEBUG
  26 #ifdef PDC_CHASSIS_DEBUG
  27 #define DPRINTK(fmt, args...)   printk(fmt, ## args)
  28 #else
  29 #define DPRINTK(fmt, args...)
  30 #endif
  31
  32 #include <linux/init.h>
  33 #include <linux/kernel.h>
  34 #include <linux/reboot.h>
  35 #include <linux/notifier.h>
  36 #include <linux/cache.h>
  37 #include <linux/proc_fs.h>
  38
  39 #include <asm/pdc_chassis.h>
  40 #include <asm/processor.h>
  41 #include <asm/pdc.h>
  42 #include <asm/pdcpat.h>
  43
  44 #define PDC_CHASSIS_VER "0.05"
  45
  46 #ifdef CONFIG_PDC_CHASSIS
  47 static unsigned int pdc_chassis_enabled __read_mostly = 1;
  48
  49
  50 /**
  51  * pdc_chassis_setup() - Enable/disable pdc_chassis code at boot time.
  52  * @str configuration param: 0 to disable chassis log
  53  * @return 1
  54  */
  55
  56 static int __init pdc_chassis_setup(char *str)
  57 {
  58         /*panic_timeout = simple_strtoul(str, NULL, 0);*/
  59         get_option(&str, &pdc_chassis_enabled);
  60         return 1;
  61 }
  62 __setup("pdcchassis=", pdc_chassis_setup);
  63
  64
  65 /**
  66  * pdc_chassis_checkold() - Checks for old PDC_CHASSIS compatibility
  67  * @pdc_chassis_old: 1 if old pdc chassis style
  68  *
  69  * Currently, only E class and A180 are known to work with this.
  70  * Inspired by Christoph Plattner
  71  */
  72 #if 0
  73 static void __init pdc_chassis_checkold(void)
  74 {
  75         switch(CPU_HVERSION) {
  76                 case 0x480:             /* E25 */
  77                 case 0x481:             /* E35 */
  78                 case 0x482:             /* E45 */
  79                 case 0x483:             /* E55 */
  80                 case 0x516:             /* A180 */
  81                         break;
  82
  83                 default:
  84                         break;
  85         }
  86         DPRINTK(KERN_DEBUG "%s: pdc_chassis_checkold(); pdc_chassis_old = %d\n", __FILE__, pdc_chassis_old);
  87 }
  88 #endif
  89
  90 /**
  91  * pdc_chassis_panic_event() - Called by the panic handler.
  92  *
  93  * As soon as a panic occurs, we should inform the PDC.
  94  */
  95
  96 static int pdc_chassis_panic_event(struct notifier_block *this,
  97                         unsigned long event, void *ptr)
  98 {
  99         pdc_chassis_send_status(PDC_CHASSIS_DIRECT_PANIC);
 100                 return NOTIFY_DONE;
 101 }
 102
 103
 104 static struct notifier_block pdc_chassis_panic_block = {
 105         .notifier_call = pdc_chassis_panic_event,
 106         .priority = INT_MAX,
 107 };
 108
 109
 110 /**
 111  * parisc_reboot_event() - Called by the reboot handler.
 112  *
 113  * As soon as a reboot occurs, we should inform the PDC.
 114  */
 115
 116 static int pdc_chassis_reboot_event(struct notifier_block *this,
 117                         unsigned long event, void *ptr)
 118 {
 119         pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN);
 120                 return NOTIFY_DONE;
 121 }
 122
 123
 124 static struct notifier_block pdc_chassis_reboot_block = {
 125         .notifier_call = pdc_chassis_reboot_event,
 126         .priority = INT_MAX,
 127 };
 128 #endif /* CONFIG_PDC_CHASSIS */
 129
 130
 131 /**
 132  * parisc_pdc_chassis_init() - Called at boot time.
 133  */
 134
 135 void __init parisc_pdc_chassis_init(void)
 136 {
 137 #ifdef CONFIG_PDC_CHASSIS
 138         if (likely(pdc_chassis_enabled)) {
 139                 DPRINTK(KERN_DEBUG "%s: parisc_pdc_chassis_init()\n", __FILE__);
 140
 141                 /* Let see if we have something to handle... */
 142                 printk(KERN_INFO "Enabling %s chassis codes support v%s\n",
 143                                 is_pdc_pat() ? "PDC_PAT" : "regular",
 144                                 PDC_CHASSIS_VER);
 145
 146                 /* initialize panic notifier chain */
 147                 atomic_notifier_chain_register(&panic_notifier_list,
 148                                 &pdc_chassis_panic_block);
 149
 150                 /* initialize reboot notifier chain */
 151                 register_reboot_notifier(&pdc_chassis_reboot_block);
 152         }
 153 #endif /* CONFIG_PDC_CHASSIS */
 154 }
 155
 156
 157 /**
 158  * pdc_chassis_send_status() - Sends a predefined message to the chassis,
 159  * and changes the front panel LEDs according to the new system state
 160  * @retval: PDC call return value.
 161  *
 162  * Only machines with 64 bits PDC PAT and those reported in
 163  * pdc_chassis_checkold() are supported atm.
 164  *
 165  * returns 0 if no error, -1 if no supported PDC is present or invalid message,
 166  * else returns the appropriate PDC error code.
 167  *
 168  * For a list of predefined messages, see asm-parisc/pdc_chassis.h
 169  */
 170
 171 int pdc_chassis_send_status(int message)
 172 {
 173         /* Maybe we should do that in an other way ? */
 174         int retval = 0;
 175 #ifdef CONFIG_PDC_CHASSIS
 176         if (likely(pdc_chassis_enabled)) {
 177
 178                 DPRINTK(KERN_DEBUG "%s: pdc_chassis_send_status(%d)\n", __FILE__, message);
 179
 180 #ifdef CONFIG_64BIT
 181                 if (is_pdc_pat()) {
 182                         switch(message) {
 183                                 case PDC_CHASSIS_DIRECT_BSTART:
 184                                         retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_BSTART, PDC_CHASSIS_LSTATE_RUN_NORMAL);
 185                                         break;
 186
 187                                 case PDC_CHASSIS_DIRECT_BCOMPLETE:
 188                                         retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_BCOMPLETE, PDC_CHASSIS_LSTATE_RUN_NORMAL);
 189                                         break;
 190
 191                                 case PDC_CHASSIS_DIRECT_SHUTDOWN:
 192                                         retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_SHUTDOWN, PDC_CHASSIS_LSTATE_NONOS);
 193                                         break;
 194
 195                                 case PDC_CHASSIS_DIRECT_PANIC:
 196                                         retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_PANIC, PDC_CHASSIS_LSTATE_RUN_CRASHREC);
 197                                         break;
 198
 199                                 case PDC_CHASSIS_DIRECT_LPMC:
 200                                         retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_LPMC, PDC_CHASSIS_LSTATE_RUN_SYSINT);
 201                                         break;
 202
 203                                 case PDC_CHASSIS_DIRECT_HPMC:
 204                                         retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_HPMC, PDC_CHASSIS_LSTATE_RUN_NCRIT);
 205                                         break;
 206
 207                                 default:
 208                                         retval = -1;
 209                         }
 210                 } else retval = -1;
 211 #else
 212                 if (1) {
 213                         switch (message) {
 214                                 case PDC_CHASSIS_DIRECT_BSTART:
 215                                         retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_INIT));
 216                                         break;
 217
 218                                 case PDC_CHASSIS_DIRECT_BCOMPLETE:
 219                                         retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_RUN));
 220                                         break;
 221
 222                                 case PDC_CHASSIS_DIRECT_SHUTDOWN:
 223                                         retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_SHUT));
 224                                         break;
 225
 226                                 case PDC_CHASSIS_DIRECT_HPMC:
 227                                 case PDC_CHASSIS_DIRECT_PANIC:
 228                                         retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_FLT));
 229                                         break;
 230
 231                                 case PDC_CHASSIS_DIRECT_LPMC:
 232                                         retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_WARN));
 233                                         break;
 234
 235                                 default:
 236                                         retval = -1;
 237                         }
 238                 } else retval = -1;
 239 #endif /* CONFIG_64BIT */
 240         }       /* if (pdc_chassis_enabled) */
 241 #endif /* CONFIG_PDC_CHASSIS */
 242         return retval;
 243 }
 244
 245 #ifdef CONFIG_PDC_CHASSIS_WARN
 246 #ifdef CONFIG_PROC_FS
 247 static int pdc_chassis_warn_pread(char *page, char **start, off_t off,
 248                 int count, int *eof, void *data)
 249 {
 250         char *out = page;
 251         int len, ret;
 252         unsigned long warn;
 253         u32 warnreg;
 254
 255         ret = pdc_chassis_warn(&warn);
 256         if (ret != PDC_OK)
 257                 return -EIO;
 258
 259         warnreg = (warn & 0xFFFFFFFF);
 260
 261         if ((warnreg >> 24) & 0xFF)
 262                 out += sprintf(out, "Chassis component failure! (eg fan or PSU): 0x%.2x\n", ((warnreg >> 24) & 0xFF));
 263
 264         out += sprintf(out, "Battery: %s\n", (warnreg & 0x04) ? "Low!" : "OK");
 265         out += sprintf(out, "Temp low: %s\n", (warnreg & 0x02) ? "Exceeded!" : "OK");
 266         out += sprintf(out, "Temp mid: %s\n", (warnreg & 0x01) ? "Exceeded!" : "OK");
 267
 268         len = out - page - off;
 269         if (len < count) {
 270                 *eof = 1;
 271                 if (len <= 0) return 0;
 272         } else {
 273                 len = count;
 274         }
 275         *start = page + off;
 276         return len;
 277 }
 278
 279 static int __init pdc_chassis_create_procfs(void)
 280 {
 281         unsigned long test;
 282         int ret;
 283
 284         ret = pdc_chassis_warn(&test);
 285         if ((ret == PDC_BAD_PROC) || (ret == PDC_BAD_OPTION)) {
 286                 /* seems that some boxes (eg L1000) do not implement this */
 287                 printk(KERN_INFO "Chassis warnings not supported.\n");
 288                 return 0;
 289         }
 290
 291         printk(KERN_INFO "Enabling PDC chassis warnings support v%s\n",
 292                         PDC_CHASSIS_VER);
 293         create_proc_read_entry("chassis", 0400, NULL, pdc_chassis_warn_pread,
 294                                 NULL);
 295         return 0;
 296 }
 297
 298 __initcall(pdc_chassis_create_procfs);
 299
 300 #endif /* CONFIG_PROC_FS */
 301 #endif /* CONFIG_PDC_CHASSIS_WARN */