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 */ 280