arch/parisc/kernel/pdc_chassis.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *    interfaces to Chassis Codes via PDC (firmware)
   4  *
   5  *    Copyright (C) 2002 Laurent Canet <canetl@esiee.fr>
   6  *    Copyright (C) 2002-2006 Thibaut VARENE <varenet@parisc-linux.org>
   7  *
   8  *    TODO: poll chassis warns, trigger (configurable) machine shutdown when
   9  *              needed.
  10  *          Find out how to get Chassis warnings out of PAT boxes?
  11  */
  12
  13 #undef PDC_CHASSIS_DEBUG
  14 #ifdef PDC_CHASSIS_DEBUG
  15 #define DPRINTK(fmt, args...)   printk(fmt, ## args)
  16 #else
  17 #define DPRINTK(fmt, args...)
  18 #endif
  19
  20 #include <linux/init.h>
  21 #include <linux/module.h>
  22 #include <linux/kernel.h>
  23 #include <linux/panic_notifier.h>
  24 #include <linux/reboot.h>
  25 #include <linux/notifier.h>
  26 #include <linux/cache.h>
  27 #include <linux/proc_fs.h>
  28 #include <linux/seq_file.h>
  29
  30 #include <asm/pdc_chassis.h>
  31 #include <asm/processor.h>
  32 #include <asm/pdc.h>
  33 #include <asm/pdcpat.h>
  34
  35 #define PDC_CHASSIS_VER "0.05"
  36
  37 #ifdef CONFIG_PDC_CHASSIS
  38 static unsigned int pdc_chassis_enabled __read_mostly = 1;
  39
  40
  41 /**
  42  * pdc_chassis_setup() - Enable/disable pdc_chassis code at boot time.
  43  * @str: configuration param: 0 to disable chassis log
  44  * @return 1
  45  */
  46
  47 static int __init pdc_chassis_setup(char *str)
  48 {
  49         /*panic_timeout = simple_strtoul(str, NULL, 0);*/
  50         get_option(&str, &pdc_chassis_enabled);
  51         return 1;
  52 }
  53 __setup("pdcchassis=", pdc_chassis_setup);
  54
  55
  56 /**
  57  * pdc_chassis_checkold() - Checks for old PDC_CHASSIS compatibility
  58  *
  59  * Currently, only E class and A180 are known to work with this.
  60  * Inspired by Christoph Plattner
  61  */
  62 #if 0
  63 static void __init pdc_chassis_checkold(void)
  64 {
  65         switch(CPU_HVERSION) {
  66                 case 0x480:             /* E25 */
  67                 case 0x481:             /* E35 */
  68                 case 0x482:             /* E45 */
  69                 case 0x483:             /* E55 */
  70                 case 0x516:             /* A180 */
  71                         break;
  72
  73                 default:
  74                         break;
  75         }
  76         DPRINTK(KERN_DEBUG "%s: pdc_chassis_checkold(); pdc_chassis_old = %d\n", __FILE__, pdc_chassis_old);
  77 }
  78 #endif
  79
  80 /**
  81  * pdc_chassis_panic_event() - Called by the panic handler.
  82  * @this: unused
  83  * @event: unused
  84  * @ptr: unused
  85  *
  86  * As soon as a panic occurs, we should inform the PDC.
  87  */
  88
  89 static int pdc_chassis_panic_event(struct notifier_block *this,
  90                         unsigned long event, void *ptr)
  91 {
  92         pdc_chassis_send_status(PDC_CHASSIS_DIRECT_PANIC);
  93         return NOTIFY_DONE;
  94 }
  95
  96
  97 static struct notifier_block pdc_chassis_panic_block = {
  98         .notifier_call = pdc_chassis_panic_event,
  99         .priority = INT_MAX,
 100 };
 101
 102
 103 /**
 104  * pdc_chassis_reboot_event() - Called by the reboot handler.
 105  * @this: unused
 106  * @event: unused
 107  * @ptr: unused
 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         if (likely(pdc_chassis_enabled)) {
 135                 DPRINTK(KERN_DEBUG "%s: parisc_pdc_chassis_init()\n", __FILE__);
 136
 137                 /* Let see if we have something to handle... */
 138                 printk(KERN_INFO "Enabling %s chassis codes support v%s\n",
 139                                 is_pdc_pat() ? "PDC_PAT" : "regular",
 140                                 PDC_CHASSIS_VER);
 141
 142                 /* initialize panic notifier chain */
 143                 atomic_notifier_chain_register(&panic_notifier_list,
 144                                 &pdc_chassis_panic_block);
 145
 146                 /* initialize reboot notifier chain */
 147                 register_reboot_notifier(&pdc_chassis_reboot_block);
 148         }
 149 #endif /* CONFIG_PDC_CHASSIS */
 150 }
 151
 152
 153 /**
 154  * pdc_chassis_send_status() - Sends a predefined message to the chassis,
 155  * and changes the front panel LEDs according to the new system state
 156  * @message: Type of message, one of PDC_CHASSIS_DIRECT_* values.
 157  *
 158  * Only machines with 64 bits PDC PAT and those reported in
 159  * pdc_chassis_checkold() are supported atm.
 160  *
 161  * returns 0 if no error, -1 if no supported PDC is present or invalid message,
 162  * else returns the appropriate PDC error code.
 163  *
 164  * For a list of predefined messages, see asm-parisc/pdc_chassis.h
 165  */
 166
 167 int pdc_chassis_send_status(int message)
 168 {
 169         /* Maybe we should do that in an other way ? */
 170         int retval = 0;
 171 #ifdef CONFIG_PDC_CHASSIS
 172         if (likely(pdc_chassis_enabled)) {
 173
 174                 DPRINTK(KERN_DEBUG "%s: pdc_chassis_send_status(%d)\n", __FILE__, message);
 175
 176 #ifdef CONFIG_64BIT
 177                 if (is_pdc_pat()) {
 178                         switch(message) {
 179                                 case PDC_CHASSIS_DIRECT_BSTART:
 180                                         retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_BSTART, PDC_CHASSIS_LSTATE_RUN_NORMAL);
 181                                         break;
 182
 183                                 case PDC_CHASSIS_DIRECT_BCOMPLETE:
 184                                         retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_BCOMPLETE, PDC_CHASSIS_LSTATE_RUN_NORMAL);
 185                                         break;
 186
 187                                 case PDC_CHASSIS_DIRECT_SHUTDOWN:
 188                                         retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_SHUTDOWN, PDC_CHASSIS_LSTATE_NONOS);
 189                                         break;
 190
 191                                 case PDC_CHASSIS_DIRECT_PANIC:
 192                                         retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_PANIC, PDC_CHASSIS_LSTATE_RUN_CRASHREC);
 193                                         break;
 194
 195                                 case PDC_CHASSIS_DIRECT_LPMC:
 196                                         retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_LPMC, PDC_CHASSIS_LSTATE_RUN_SYSINT);
 197                                         break;
 198
 199                                 case PDC_CHASSIS_DIRECT_HPMC:
 200                                         retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_HPMC, PDC_CHASSIS_LSTATE_RUN_NCRIT);
 201                                         break;
 202
 203                                 default:
 204                                         retval = -1;
 205                         }
 206                 } else retval = -1;
 207 #else
 208                 if (1) {
 209                         switch (message) {
 210                                 case PDC_CHASSIS_DIRECT_BSTART:
 211                                         retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_INIT));
 212                                         break;
 213
 214                                 case PDC_CHASSIS_DIRECT_BCOMPLETE:
 215                                         retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_RUN));
 216                                         break;
 217
 218                                 case PDC_CHASSIS_DIRECT_SHUTDOWN:
 219                                         retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_SHUT));
 220                                         break;
 221
 222                                 case PDC_CHASSIS_DIRECT_HPMC:
 223                                 case PDC_CHASSIS_DIRECT_PANIC:
 224                                         retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_FLT));
 225                                         break;
 226
 227                                 case PDC_CHASSIS_DIRECT_LPMC:
 228                                         retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_WARN));
 229                                         break;
 230
 231                                 default:
 232                                         retval = -1;
 233                         }
 234                 } else retval = -1;
 235 #endif /* CONFIG_64BIT */
 236         }       /* if (pdc_chassis_enabled) */
 237 #endif /* CONFIG_PDC_CHASSIS */
 238         return retval;
 239 }
 240
 241 #ifdef CONFIG_PDC_CHASSIS_WARN
 242 #ifdef CONFIG_PROC_FS
 243 static int pdc_chassis_warn_show(struct seq_file *m, void *v)
 244 {
 245         unsigned long warn;
 246         u32 warnreg;
 247
 248         if (pdc_chassis_warn(&warn) != PDC_OK)
 249                 return -EIO;
 250
 251         warnreg = (warn & 0xFFFFFFFF);
 252
 253         if ((warnreg >> 24) & 0xFF)
 254                 seq_printf(m, "Chassis component failure! (eg fan or PSU): 0x%.2x\n",
 255                            (warnreg >> 24) & 0xFF);
 256
 257         seq_printf(m, "Battery: %s\n", (warnreg & 0x04) ? "Low!" : "OK");
 258         seq_printf(m, "Temp low: %s\n", (warnreg & 0x02) ? "Exceeded!" : "OK");
 259         seq_printf(m, "Temp mid: %s\n", (warnreg & 0x01) ? "Exceeded!" : "OK");
 260         return 0;
 261 }
 262
 263 static int __init pdc_chassis_create_procfs(void)
 264 {
 265         unsigned long test;
 266         int ret;
 267
 268         ret = pdc_chassis_warn(&test);
 269         if ((ret == PDC_BAD_PROC) || (ret == PDC_BAD_OPTION)) {
 270                 /* seems that some boxes (eg L1000) do not implement this */
 271                 printk(KERN_INFO "Chassis warnings not supported.\n");
 272                 return 0;
 273         }
 274
 275         printk(KERN_INFO "Enabling PDC chassis warnings support v%s\n",
 276                         PDC_CHASSIS_VER);
 277         proc_create_single("chassis", 0400, NULL, pdc_chassis_warn_show);
 278         return 0;
 279 }
 280
 281 __initcall(pdc_chassis_create_procfs);
 282
 283 #endif /* CONFIG_PROC_FS */
 284 #endif /* CONFIG_PDC_CHASSIS_WARN */