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  * @pdc_chassis_old: 1 if old pdc chassis style
  59  *
  60  * Currently, only E class and A180 are known to work with this.
  61  * Inspired by Christoph Plattner
  62  */
  63 #if 0
  64 static void __init pdc_chassis_checkold(void)
  65 {
  66         switch(CPU_HVERSION) {
  67                 case 0x480:             /* E25 */
  68                 case 0x481:             /* E35 */
  69                 case 0x482:             /* E45 */
  70                 case 0x483:             /* E55 */
  71                 case 0x516:             /* A180 */
  72                         break;
  73
  74                 default:
  75                         break;
  76         }
  77         DPRINTK(KERN_DEBUG "%s: pdc_chassis_checkold(); pdc_chassis_old = %d\n", __FILE__, pdc_chassis_old);
  78 }
  79 #endif
  80
  81 /**
  82  * pdc_chassis_panic_event() - Called by the panic handler.
  83  *
  84  * As soon as a panic occurs, we should inform the PDC.
  85  */
  86
  87 static int pdc_chassis_panic_event(struct notifier_block *this,
  88                         unsigned long event, void *ptr)
  89 {
  90         pdc_chassis_send_status(PDC_CHASSIS_DIRECT_PANIC);
  91                 return NOTIFY_DONE;
  92 }
  93
  94
  95 static struct notifier_block pdc_chassis_panic_block = {
  96         .notifier_call = pdc_chassis_panic_event,
  97         .priority = INT_MAX,
  98 };
  99
 100
 101 /**
 102  * parisc_reboot_event() - Called by the reboot handler.
 103  *
 104  * As soon as a reboot occurs, we should inform the PDC.
 105  */
 106
 107 static int pdc_chassis_reboot_event(struct notifier_block *this,
 108                         unsigned long event, void *ptr)
 109 {
 110         pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN);
 111                 return NOTIFY_DONE;
 112 }
 113
 114
 115 static struct notifier_block pdc_chassis_reboot_block = {
 116         .notifier_call = pdc_chassis_reboot_event,
 117         .priority = INT_MAX,
 118 };
 119 #endif /* CONFIG_PDC_CHASSIS */
 120
 121
 122 /**
 123  * parisc_pdc_chassis_init() - Called at boot time.
 124  */
 125
 126 void __init parisc_pdc_chassis_init(void)
 127 {
 128 #ifdef CONFIG_PDC_CHASSIS
 129         if (likely(pdc_chassis_enabled)) {
 130                 DPRINTK(KERN_DEBUG "%s: parisc_pdc_chassis_init()\n", __FILE__);
 131
 132                 /* Let see if we have something to handle... */
 133                 printk(KERN_INFO "Enabling %s chassis codes support v%s\n",
 134                                 is_pdc_pat() ? "PDC_PAT" : "regular",
 135                                 PDC_CHASSIS_VER);
 136
 137                 /* initialize panic notifier chain */
 138                 atomic_notifier_chain_register(&panic_notifier_list,
 139                                 &pdc_chassis_panic_block);
 140
 141                 /* initialize reboot notifier chain */
 142                 register_reboot_notifier(&pdc_chassis_reboot_block);
 143         }
 144 #endif /* CONFIG_PDC_CHASSIS */
 145 }
 146
 147
 148 /**
 149  * pdc_chassis_send_status() - Sends a predefined message to the chassis,
 150  * and changes the front panel LEDs according to the new system state
 151  * @retval: PDC call return value.
 152  *
 153  * Only machines with 64 bits PDC PAT and those reported in
 154  * pdc_chassis_checkold() are supported atm.
 155  *
 156  * returns 0 if no error, -1 if no supported PDC is present or invalid message,
 157  * else returns the appropriate PDC error code.
 158  *
 159  * For a list of predefined messages, see asm-parisc/pdc_chassis.h
 160  */
 161
 162 int pdc_chassis_send_status(int message)
 163 {
 164         /* Maybe we should do that in an other way ? */
 165         int retval = 0;
 166 #ifdef CONFIG_PDC_CHASSIS
 167         if (likely(pdc_chassis_enabled)) {
 168
 169                 DPRINTK(KERN_DEBUG "%s: pdc_chassis_send_status(%d)\n", __FILE__, message);
 170
 171 #ifdef CONFIG_64BIT
 172                 if (is_pdc_pat()) {
 173                         switch(message) {
 174                                 case PDC_CHASSIS_DIRECT_BSTART:
 175                                         retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_BSTART, PDC_CHASSIS_LSTATE_RUN_NORMAL);
 176                                         break;
 177
 178                                 case PDC_CHASSIS_DIRECT_BCOMPLETE:
 179                                         retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_BCOMPLETE, PDC_CHASSIS_LSTATE_RUN_NORMAL);
 180                                         break;
 181
 182                                 case PDC_CHASSIS_DIRECT_SHUTDOWN:
 183                                         retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_SHUTDOWN, PDC_CHASSIS_LSTATE_NONOS);
 184                                         break;
 185
 186                                 case PDC_CHASSIS_DIRECT_PANIC:
 187                                         retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_PANIC, PDC_CHASSIS_LSTATE_RUN_CRASHREC);
 188                                         break;
 189
 190                                 case PDC_CHASSIS_DIRECT_LPMC:
 191                                         retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_LPMC, PDC_CHASSIS_LSTATE_RUN_SYSINT);
 192                                         break;
 193
 194                                 case PDC_CHASSIS_DIRECT_HPMC:
 195                                         retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_HPMC, PDC_CHASSIS_LSTATE_RUN_NCRIT);
 196                                         break;
 197
 198                                 default:
 199                                         retval = -1;
 200                         }
 201                 } else retval = -1;
 202 #else
 203                 if (1) {
 204                         switch (message) {
 205                                 case PDC_CHASSIS_DIRECT_BSTART:
 206                                         retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_INIT));
 207                                         break;
 208
 209                                 case PDC_CHASSIS_DIRECT_BCOMPLETE:
 210                                         retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_RUN));
 211                                         break;
 212
 213                                 case PDC_CHASSIS_DIRECT_SHUTDOWN:
 214                                         retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_SHUT));
 215                                         break;
 216
 217                                 case PDC_CHASSIS_DIRECT_HPMC:
 218                                 case PDC_CHASSIS_DIRECT_PANIC:
 219                                         retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_FLT));
 220                                         break;
 221
 222                                 case PDC_CHASSIS_DIRECT_LPMC:
 223                                         retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_WARN));
 224                                         break;
 225
 226                                 default:
 227                                         retval = -1;
 228                         }
 229                 } else retval = -1;
 230 #endif /* CONFIG_64BIT */
 231         }       /* if (pdc_chassis_enabled) */
 232 #endif /* CONFIG_PDC_CHASSIS */
 233         return retval;
 234 }
 235
 236 #ifdef CONFIG_PDC_CHASSIS_WARN
 237 #ifdef CONFIG_PROC_FS
 238 static int pdc_chassis_warn_show(struct seq_file *m, void *v)
 239 {
 240         unsigned long warn;
 241         u32 warnreg;
 242
 243         if (pdc_chassis_warn(&warn) != PDC_OK)
 244                 return -EIO;
 245
 246         warnreg = (warn & 0xFFFFFFFF);
 247
 248         if ((warnreg >> 24) & 0xFF)
 249                 seq_printf(m, "Chassis component failure! (eg fan or PSU): 0x%.2x\n",
 250                            (warnreg >> 24) & 0xFF);
 251
 252         seq_printf(m, "Battery: %s\n", (warnreg & 0x04) ? "Low!" : "OK");
 253         seq_printf(m, "Temp low: %s\n", (warnreg & 0x02) ? "Exceeded!" : "OK");
 254         seq_printf(m, "Temp mid: %s\n", (warnreg & 0x01) ? "Exceeded!" : "OK");
 255         return 0;
 256 }
 257
 258 static int __init pdc_chassis_create_procfs(void)
 259 {
 260         unsigned long test;
 261         int ret;
 262
 263         ret = pdc_chassis_warn(&test);
 264         if ((ret == PDC_BAD_PROC) || (ret == PDC_BAD_OPTION)) {
 265                 /* seems that some boxes (eg L1000) do not implement this */
 266                 printk(KERN_INFO "Chassis warnings not supported.\n");
 267                 return 0;
 268         }
 269
 270         printk(KERN_INFO "Enabling PDC chassis warnings support v%s\n",
 271                         PDC_CHASSIS_VER);
 272         proc_create_single("chassis", 0400, NULL, pdc_chassis_warn_show);
 273         return 0;
 274 }
 275
 276 __initcall(pdc_chassis_create_procfs);
 277
 278 #endif /* CONFIG_PROC_FS */
 279 #endif /* CONFIG_PDC_CHASSIS_WARN */