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/module.h> 34 #include <linux/kernel.h> 35 #include <linux/reboot.h> 36 #include <linux/notifier.h> 37 #include <linux/cache.h> 38 #include <linux/proc_fs.h> 39 #include <linux/seq_file.h> 40 41 #include <asm/pdc_chassis.h> 42 #include <asm/processor.h> 43 #include <asm/pdc.h> 44 #include <asm/pdcpat.h> 45 46 #define PDC_CHASSIS_VER "0.05" 47 48 #ifdef CONFIG_PDC_CHASSIS 49 static unsigned int pdc_chassis_enabled __read_mostly = 1; 50 51 52 /** 53 * pdc_chassis_setup() - Enable/disable pdc_chassis code at boot time. 54 * @str configuration param: 0 to disable chassis log 55 * @return 1 56 */ 57 58 static int __init pdc_chassis_setup(char *str) 59 { 60 /*panic_timeout = simple_strtoul(str, NULL, 0);*/ 61 get_option(&str, &pdc_chassis_enabled); 62 return 1; 63 } 64 __setup("pdcchassis=", pdc_chassis_setup); 65 66 67 /** 68 * pdc_chassis_checkold() - Checks for old PDC_CHASSIS compatibility 69 * @pdc_chassis_old: 1 if old pdc chassis style 70 * 71 * Currently, only E class and A180 are known to work with this. 72 * Inspired by Christoph Plattner 73 */ 74 #if 0 75 static void __init pdc_chassis_checkold(void) 76 { 77 switch(CPU_HVERSION) { 78 case 0x480: /* E25 */ 79 case 0x481: /* E35 */ 80 case 0x482: /* E45 */ 81 case 0x483: /* E55 */ 82 case 0x516: /* A180 */ 83 break; 84 85 default: 86 break; 87 } 88 DPRINTK(KERN_DEBUG "%s: pdc_chassis_checkold(); pdc_chassis_old = %d\n", __FILE__, pdc_chassis_old); 89 } 90 #endif 91 92 /** 93 * pdc_chassis_panic_event() - Called by the panic handler. 94 * 95 * As soon as a panic occurs, we should inform the PDC. 96 */ 97 98 static int pdc_chassis_panic_event(struct notifier_block *this, 99 unsigned long event, void *ptr) 100 { 101 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_PANIC); 102 return NOTIFY_DONE; 103 } 104 105 106 static struct notifier_block pdc_chassis_panic_block = { 107 .notifier_call = pdc_chassis_panic_event, 108 .priority = INT_MAX, 109 }; 110 111 112 /** 113 * parisc_reboot_event() - Called by the reboot handler. 114 * 115 * As soon as a reboot occurs, we should inform the PDC. 116 */ 117 118 static int pdc_chassis_reboot_event(struct notifier_block *this, 119 unsigned long event, void *ptr) 120 { 121 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN); 122 return NOTIFY_DONE; 123 } 124 125 126 static struct notifier_block pdc_chassis_reboot_block = { 127 .notifier_call = pdc_chassis_reboot_event, 128 .priority = INT_MAX, 129 }; 130 #endif /* CONFIG_PDC_CHASSIS */ 131 132 133 /** 134 * parisc_pdc_chassis_init() - Called at boot time. 135 */ 136 137 void __init parisc_pdc_chassis_init(void) 138 { 139 #ifdef CONFIG_PDC_CHASSIS 140 if (likely(pdc_chassis_enabled)) { 141 DPRINTK(KERN_DEBUG "%s: parisc_pdc_chassis_init()\n", __FILE__); 142 143 /* Let see if we have something to handle... */ 144 printk(KERN_INFO "Enabling %s chassis codes support v%s\n", 145 is_pdc_pat() ? "PDC_PAT" : "regular", 146 PDC_CHASSIS_VER); 147 148 /* initialize panic notifier chain */ 149 atomic_notifier_chain_register(&panic_notifier_list, 150 &pdc_chassis_panic_block); 151 152 /* initialize reboot notifier chain */ 153 register_reboot_notifier(&pdc_chassis_reboot_block); 154 } 155 #endif /* CONFIG_PDC_CHASSIS */ 156 } 157 158 159 /** 160 * pdc_chassis_send_status() - Sends a predefined message to the chassis, 161 * and changes the front panel LEDs according to the new system state 162 * @retval: PDC call return value. 163 * 164 * Only machines with 64 bits PDC PAT and those reported in 165 * pdc_chassis_checkold() are supported atm. 166 * 167 * returns 0 if no error, -1 if no supported PDC is present or invalid message, 168 * else returns the appropriate PDC error code. 169 * 170 * For a list of predefined messages, see asm-parisc/pdc_chassis.h 171 */ 172 173 int pdc_chassis_send_status(int message) 174 { 175 /* Maybe we should do that in an other way ? */ 176 int retval = 0; 177 #ifdef CONFIG_PDC_CHASSIS 178 if (likely(pdc_chassis_enabled)) { 179 180 DPRINTK(KERN_DEBUG "%s: pdc_chassis_send_status(%d)\n", __FILE__, message); 181 182 #ifdef CONFIG_64BIT 183 if (is_pdc_pat()) { 184 switch(message) { 185 case PDC_CHASSIS_DIRECT_BSTART: 186 retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_BSTART, PDC_CHASSIS_LSTATE_RUN_NORMAL); 187 break; 188 189 case PDC_CHASSIS_DIRECT_BCOMPLETE: 190 retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_BCOMPLETE, PDC_CHASSIS_LSTATE_RUN_NORMAL); 191 break; 192 193 case PDC_CHASSIS_DIRECT_SHUTDOWN: 194 retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_SHUTDOWN, PDC_CHASSIS_LSTATE_NONOS); 195 break; 196 197 case PDC_CHASSIS_DIRECT_PANIC: 198 retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_PANIC, PDC_CHASSIS_LSTATE_RUN_CRASHREC); 199 break; 200 201 case PDC_CHASSIS_DIRECT_LPMC: 202 retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_LPMC, PDC_CHASSIS_LSTATE_RUN_SYSINT); 203 break; 204 205 case PDC_CHASSIS_DIRECT_HPMC: 206 retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_HPMC, PDC_CHASSIS_LSTATE_RUN_NCRIT); 207 break; 208 209 default: 210 retval = -1; 211 } 212 } else retval = -1; 213 #else 214 if (1) { 215 switch (message) { 216 case PDC_CHASSIS_DIRECT_BSTART: 217 retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_INIT)); 218 break; 219 220 case PDC_CHASSIS_DIRECT_BCOMPLETE: 221 retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_RUN)); 222 break; 223 224 case PDC_CHASSIS_DIRECT_SHUTDOWN: 225 retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_SHUT)); 226 break; 227 228 case PDC_CHASSIS_DIRECT_HPMC: 229 case PDC_CHASSIS_DIRECT_PANIC: 230 retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_FLT)); 231 break; 232 233 case PDC_CHASSIS_DIRECT_LPMC: 234 retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_WARN)); 235 break; 236 237 default: 238 retval = -1; 239 } 240 } else retval = -1; 241 #endif /* CONFIG_64BIT */ 242 } /* if (pdc_chassis_enabled) */ 243 #endif /* CONFIG_PDC_CHASSIS */ 244 return retval; 245 } 246 247 #ifdef CONFIG_PDC_CHASSIS_WARN 248 #ifdef CONFIG_PROC_FS 249 static int pdc_chassis_warn_show(struct seq_file *m, void *v) 250 { 251 unsigned long warn; 252 u32 warnreg; 253 254 if (pdc_chassis_warn(&warn) != PDC_OK) 255 return -EIO; 256 257 warnreg = (warn & 0xFFFFFFFF); 258 259 if ((warnreg >> 24) & 0xFF) 260 seq_printf(m, "Chassis component failure! (eg fan or PSU): 0x%.2x\n", 261 (warnreg >> 24) & 0xFF); 262 263 seq_printf(m, "Battery: %s\n", (warnreg & 0x04) ? "Low!" : "OK"); 264 seq_printf(m, "Temp low: %s\n", (warnreg & 0x02) ? "Exceeded!" : "OK"); 265 seq_printf(m, "Temp mid: %s\n", (warnreg & 0x01) ? "Exceeded!" : "OK"); 266 return 0; 267 } 268 269 static int pdc_chassis_warn_open(struct inode *inode, struct file *file) 270 { 271 return single_open(file, pdc_chassis_warn_show, NULL); 272 } 273 274 static const struct file_operations pdc_chassis_warn_fops = { 275 .open = pdc_chassis_warn_open, 276 .read = seq_read, 277 .llseek = seq_lseek, 278 .release = single_release, 279 }; 280 281 static int __init pdc_chassis_create_procfs(void) 282 { 283 unsigned long test; 284 int ret; 285 286 ret = pdc_chassis_warn(&test); 287 if ((ret == PDC_BAD_PROC) || (ret == PDC_BAD_OPTION)) { 288 /* seems that some boxes (eg L1000) do not implement this */ 289 printk(KERN_INFO "Chassis warnings not supported.\n"); 290 return 0; 291 } 292 293 printk(KERN_INFO "Enabling PDC chassis warnings support v%s\n", 294 PDC_CHASSIS_VER); 295 proc_create("chassis", 0400, NULL, &pdc_chassis_warn_fops); 296 return 0; 297 } 298 299 __initcall(pdc_chassis_create_procfs); 300 301 #endif /* CONFIG_PROC_FS */ 302 #endif /* CONFIG_PDC_CHASSIS_WARN */ 303