LXR linux/arch/parisc/kernel/pdc

   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
  47static 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 
  56static 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
  73static 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
  96static 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
 104static 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
 116static 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
 124static 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
 135void __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
 171int 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
 247static 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
 279static 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 */
 302