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 */ 285