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
pdc_chassis_setup(char * str)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
pdc_chassis_panic_event(struct notifier_block * this,unsigned long event,void * ptr)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
pdc_chassis_reboot_event(struct notifier_block * this,unsigned long event,void * ptr)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
parisc_pdc_chassis_init(void)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
pdc_chassis_send_status(int message)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
pdc_chassis_warn_show(struct seq_file * m,void * v)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
pdc_chassis_create_procfs(void)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