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 #include <asm/led.h>
35
36 #define PDC_CHASSIS_VER "0.05"
37
38 #ifdef CONFIG_PDC_CHASSIS
39 static unsigned int pdc_chassis_enabled __read_mostly = 1;
40
41
42 /**
43 * pdc_chassis_setup() - Enable/disable pdc_chassis code at boot time.
44 * @str: configuration param: 0 to disable chassis log
45 * @return 1
46 */
47
48 static int __init pdc_chassis_setup(char *str)
49 {
50 /*panic_timeout = simple_strtoul(str, NULL, 0);*/
51 get_option(&str, &pdc_chassis_enabled);
52 return 1;
53 }
54 __setup("pdcchassis=", pdc_chassis_setup);
55
56
57 /**
58 * pdc_chassis_checkold() - Checks for old PDC_CHASSIS compatibility
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 * @this: unused
84 * @event: unused
85 * @ptr: unused
86 *
87 * As soon as a panic occurs, we should inform the PDC.
88 */
89
90 static int pdc_chassis_panic_event(struct notifier_block *this,
91 unsigned long event, void *ptr)
92 {
93 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_PANIC);
94 return NOTIFY_DONE;
95 }
96
97
98 static struct notifier_block pdc_chassis_panic_block = {
99 .notifier_call = pdc_chassis_panic_event,
100 .priority = INT_MAX,
101 };
102
103
104 /**
105 * pdc_chassis_reboot_event() - Called by the reboot handler.
106 * @this: unused
107 * @event: unused
108 * @ptr: unused
109 *
110 * As soon as a reboot occurs, we should inform the PDC.
111 */
112
113 static int pdc_chassis_reboot_event(struct notifier_block *this,
114 unsigned long event, void *ptr)
115 {
116 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN);
117 return NOTIFY_DONE;
118 }
119
120
121 static struct notifier_block pdc_chassis_reboot_block = {
122 .notifier_call = pdc_chassis_reboot_event,
123 .priority = INT_MAX,
124 };
125 #endif /* CONFIG_PDC_CHASSIS */
126
127
128 /**
129 * parisc_pdc_chassis_init() - Called at boot time.
130 */
131
132 void __init parisc_pdc_chassis_init(void)
133 {
134 #ifdef CONFIG_PDC_CHASSIS
135 if (likely(pdc_chassis_enabled)) {
136 DPRINTK(KERN_DEBUG "%s: parisc_pdc_chassis_init()\n", __FILE__);
137
138 /* Let see if we have something to handle... */
139 printk(KERN_INFO "Enabling %s chassis codes support v%s\n",
140 is_pdc_pat() ? "PDC_PAT" : "regular",
141 PDC_CHASSIS_VER);
142
143 /* initialize panic notifier chain */
144 atomic_notifier_chain_register(&panic_notifier_list,
145 &pdc_chassis_panic_block);
146
147 /* initialize reboot notifier chain */
148 register_reboot_notifier(&pdc_chassis_reboot_block);
149 }
150 #endif /* CONFIG_PDC_CHASSIS */
151 }
152
153
154 /**
155 * pdc_chassis_send_status() - Sends a predefined message to the chassis,
156 * and changes the front panel LEDs according to the new system state
157 * @message: Type of message, one of PDC_CHASSIS_DIRECT_* values.
158 *
159 * Only machines with 64 bits PDC PAT and those reported in
160 * pdc_chassis_checkold() are supported atm.
161 *
162 * returns 0 if no error, -1 if no supported PDC is present or invalid message,
163 * else returns the appropriate PDC error code.
164 *
165 * For a list of predefined messages, see asm-parisc/pdc_chassis.h
166 */
167
168 int pdc_chassis_send_status(int message)
169 {
170 /* Maybe we should do that in an other way ? */
171 int retval = 0;
172 #ifdef CONFIG_PDC_CHASSIS
173 if (likely(pdc_chassis_enabled)) {
174
175 DPRINTK(KERN_DEBUG "%s: pdc_chassis_send_status(%d)\n", __FILE__, message);
176
177 #ifdef CONFIG_64BIT
178 if (is_pdc_pat()) {
179 switch(message) {
180 case PDC_CHASSIS_DIRECT_BSTART:
181 retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_BSTART, PDC_CHASSIS_LSTATE_RUN_NORMAL);
182 break;
183
184 case PDC_CHASSIS_DIRECT_BCOMPLETE:
185 retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_BCOMPLETE, PDC_CHASSIS_LSTATE_RUN_NORMAL);
186 break;
187
188 case PDC_CHASSIS_DIRECT_SHUTDOWN:
189 retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_SHUTDOWN, PDC_CHASSIS_LSTATE_NONOS);
190 break;
191
192 case PDC_CHASSIS_DIRECT_PANIC:
193 retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_PANIC, PDC_CHASSIS_LSTATE_RUN_CRASHREC);
194 break;
195
196 case PDC_CHASSIS_DIRECT_LPMC:
197 retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_LPMC, PDC_CHASSIS_LSTATE_RUN_SYSINT);
198 break;
199
200 case PDC_CHASSIS_DIRECT_HPMC:
201 retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_HPMC, PDC_CHASSIS_LSTATE_RUN_NCRIT);
202 break;
203
204 default:
205 retval = -1;
206 }
207 } else retval = -1;
208 #else
209 if (1) {
210 switch (message) {
211 case PDC_CHASSIS_DIRECT_BSTART:
212 retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_INIT));
213 break;
214
215 case PDC_CHASSIS_DIRECT_BCOMPLETE:
216 retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_RUN));
217 break;
218
219 case PDC_CHASSIS_DIRECT_SHUTDOWN:
220 retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_SHUT));
221 break;
222
223 case PDC_CHASSIS_DIRECT_HPMC:
224 case PDC_CHASSIS_DIRECT_PANIC:
225 retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_FLT));
226 break;
227
228 case PDC_CHASSIS_DIRECT_LPMC:
229 retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_WARN));
230 break;
231
232 default:
233 retval = -1;
234 }
235 } else retval = -1;
236 #endif /* CONFIG_64BIT */
237 } /* if (pdc_chassis_enabled) */
238
239 /* if system has LCD display, update current string */
240 if (retval != -1 && IS_ENABLED(CONFIG_CHASSIS_LCD_LED))
241 lcd_print(NULL);
242
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 __init pdc_chassis_create_procfs(void)
270 {
271 unsigned long test;
272 int ret;
273
274 ret = pdc_chassis_warn(&test);
275 if ((ret == PDC_BAD_PROC) || (ret == PDC_BAD_OPTION)) {
276 /* seems that some boxes (eg L1000) do not implement this */
277 printk(KERN_INFO "Chassis warnings not supported.\n");
278 return 0;
279 }
280
281 printk(KERN_INFO "Enabling PDC chassis warnings support v%s\n",
282 PDC_CHASSIS_VER);
283 proc_create_single("chassis", 0400, NULL, pdc_chassis_warn_show);
284 return 0;
285 }
286
287 __initcall(pdc_chassis_create_procfs);
288
289 #endif /* CONFIG_PROC_FS */
290 #endif /* CONFIG_PDC_CHASSIS_WARN */
291
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