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/arch/parisc/kernel/pdc_chassis.c

https://github.com/aicjofs/android_kernel_lge_v500_20d_f2fs
C | 301 lines | 181 code | 53 blank | 67 comment | 17 complexity | 286bfb11e312792f2b53e2d1c235bf02 MD5 | raw file
  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/kernel.h>
 34#include <linux/reboot.h>
 35#include <linux/notifier.h>
 36#include <linux/cache.h>
 37#include <linux/proc_fs.h>
 38
 39#include <asm/pdc_chassis.h>
 40#include <asm/processor.h>
 41#include <asm/pdc.h>
 42#include <asm/pdcpat.h>
 43
 44#define PDC_CHASSIS_VER	"0.05"
 45
 46#ifdef CONFIG_PDC_CHASSIS
 47static unsigned int pdc_chassis_enabled __read_mostly = 1;
 48
 49
 50/**
 51 * pdc_chassis_setup() - Enable/disable pdc_chassis code at boot time.
 52 * @str configuration param: 0 to disable chassis log
 53 * @return 1
 54 */
 55 
 56static int __init pdc_chassis_setup(char *str)
 57{
 58	/*panic_timeout = simple_strtoul(str, NULL, 0);*/
 59	get_option(&str, &pdc_chassis_enabled);
 60	return 1;
 61}
 62__setup("pdcchassis=", pdc_chassis_setup);
 63
 64
 65/** 
 66 * pdc_chassis_checkold() - Checks for old PDC_CHASSIS compatibility
 67 * @pdc_chassis_old: 1 if old pdc chassis style
 68 * 
 69 * Currently, only E class and A180 are known to work with this.
 70 * Inspired by Christoph Plattner
 71 */
 72#if 0
 73static void __init pdc_chassis_checkold(void)
 74{
 75	switch(CPU_HVERSION) {
 76		case 0x480:		/* E25 */
 77		case 0x481:		/* E35 */
 78		case 0x482:		/* E45 */
 79		case 0x483:		/* E55 */
 80		case 0x516:		/* A180 */
 81			break;
 82
 83		default:
 84			break;
 85	}
 86	DPRINTK(KERN_DEBUG "%s: pdc_chassis_checkold(); pdc_chassis_old = %d\n", __FILE__, pdc_chassis_old);
 87}
 88#endif
 89
 90/**
 91 * pdc_chassis_panic_event() - Called by the panic handler.
 92 *
 93 * As soon as a panic occurs, we should inform the PDC.
 94 */
 95
 96static int pdc_chassis_panic_event(struct notifier_block *this,
 97		        unsigned long event, void *ptr)
 98{
 99	pdc_chassis_send_status(PDC_CHASSIS_DIRECT_PANIC);
100		return NOTIFY_DONE;
101}   
102
103
104static struct notifier_block pdc_chassis_panic_block = {
105	.notifier_call = pdc_chassis_panic_event,
106	.priority = INT_MAX,
107};
108
109
110/**
111 * parisc_reboot_event() - Called by the reboot handler.
112 *
113 * As soon as a reboot occurs, we should inform the PDC.
114 */
115
116static int pdc_chassis_reboot_event(struct notifier_block *this,
117		        unsigned long event, void *ptr)
118{
119	pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN);
120		return NOTIFY_DONE;
121}   
122
123
124static struct notifier_block pdc_chassis_reboot_block = {
125	.notifier_call = pdc_chassis_reboot_event,
126	.priority = INT_MAX,
127};
128#endif /* CONFIG_PDC_CHASSIS */
129
130
131/**
132 * parisc_pdc_chassis_init() - Called at boot time.
133 */
134
135void __init parisc_pdc_chassis_init(void)
136{
137#ifdef CONFIG_PDC_CHASSIS
138	if (likely(pdc_chassis_enabled)) {
139		DPRINTK(KERN_DEBUG "%s: parisc_pdc_chassis_init()\n", __FILE__);
140
141		/* Let see if we have something to handle... */
142		printk(KERN_INFO "Enabling %s chassis codes support v%s\n",
143				is_pdc_pat() ? "PDC_PAT" : "regular",
144				PDC_CHASSIS_VER);
145
146		/* initialize panic notifier chain */
147		atomic_notifier_chain_register(&panic_notifier_list,
148				&pdc_chassis_panic_block);
149
150		/* initialize reboot notifier chain */
151		register_reboot_notifier(&pdc_chassis_reboot_block);
152	}
153#endif /* CONFIG_PDC_CHASSIS */
154}
155
156
157/** 
158 * pdc_chassis_send_status() - Sends a predefined message to the chassis,
159 * and changes the front panel LEDs according to the new system state
160 * @retval: PDC call return value.
161 *
162 * Only machines with 64 bits PDC PAT and those reported in
163 * pdc_chassis_checkold() are supported atm.
164 * 
165 * returns 0 if no error, -1 if no supported PDC is present or invalid message,
166 * else returns the appropriate PDC error code.
167 * 
168 * For a list of predefined messages, see asm-parisc/pdc_chassis.h
169 */
170
171int pdc_chassis_send_status(int message)
172{
173	/* Maybe we should do that in an other way ? */
174	int retval = 0;
175#ifdef CONFIG_PDC_CHASSIS
176	if (likely(pdc_chassis_enabled)) {
177
178		DPRINTK(KERN_DEBUG "%s: pdc_chassis_send_status(%d)\n", __FILE__, message);
179
180#ifdef CONFIG_64BIT
181		if (is_pdc_pat()) {
182			switch(message) {
183				case PDC_CHASSIS_DIRECT_BSTART:
184					retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_BSTART, PDC_CHASSIS_LSTATE_RUN_NORMAL);
185					break;
186
187				case PDC_CHASSIS_DIRECT_BCOMPLETE:
188					retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_BCOMPLETE, PDC_CHASSIS_LSTATE_RUN_NORMAL);
189					break;
190
191				case PDC_CHASSIS_DIRECT_SHUTDOWN:
192					retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_SHUTDOWN, PDC_CHASSIS_LSTATE_NONOS);
193					break;
194
195				case PDC_CHASSIS_DIRECT_PANIC:
196					retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_PANIC, PDC_CHASSIS_LSTATE_RUN_CRASHREC);
197					break;
198
199				case PDC_CHASSIS_DIRECT_LPMC:
200					retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_LPMC, PDC_CHASSIS_LSTATE_RUN_SYSINT);
201					break;
202
203				case PDC_CHASSIS_DIRECT_HPMC:
204					retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_HPMC, PDC_CHASSIS_LSTATE_RUN_NCRIT);
205					break;
206
207				default:
208					retval = -1;
209			}
210		} else retval = -1;
211#else
212		if (1) {
213			switch (message) {
214				case PDC_CHASSIS_DIRECT_BSTART:
215					retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_INIT));
216					break;
217
218				case PDC_CHASSIS_DIRECT_BCOMPLETE:
219					retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_RUN));
220					break;
221
222				case PDC_CHASSIS_DIRECT_SHUTDOWN:
223					retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_SHUT));
224					break;
225
226				case PDC_CHASSIS_DIRECT_HPMC:
227				case PDC_CHASSIS_DIRECT_PANIC:
228					retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_FLT));
229					break;
230
231				case PDC_CHASSIS_DIRECT_LPMC:
232					retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_WARN));
233					break;
234
235				default:
236					retval = -1;
237			}
238		} else retval = -1;
239#endif /* CONFIG_64BIT */
240	}	/* if (pdc_chassis_enabled) */
241#endif /* CONFIG_PDC_CHASSIS */
242	return retval;
243}
244
245#ifdef CONFIG_PDC_CHASSIS_WARN
246#ifdef CONFIG_PROC_FS
247static int pdc_chassis_warn_pread(char *page, char **start, off_t off,
248		int count, int *eof, void *data)
249{
250	char *out = page;
251	int len, ret;
252	unsigned long warn;
253	u32 warnreg;
254
255	ret = pdc_chassis_warn(&warn);
256	if (ret != PDC_OK)
257		return -EIO;
258
259	warnreg = (warn & 0xFFFFFFFF);
260
261	if ((warnreg >> 24) & 0xFF)
262		out += sprintf(out, "Chassis component failure! (eg fan or PSU): 0x%.2x\n", ((warnreg >> 24) & 0xFF));
263
264	out += sprintf(out, "Battery: %s\n", (warnreg & 0x04) ? "Low!" : "OK");
265	out += sprintf(out, "Temp low: %s\n", (warnreg & 0x02) ? "Exceeded!" : "OK");
266	out += sprintf(out, "Temp mid: %s\n", (warnreg & 0x01) ? "Exceeded!" : "OK");
267
268	len = out - page - off;
269	if (len < count) {
270		*eof = 1;
271		if (len <= 0) return 0;
272	} else {
273		len = count;
274	}
275	*start = page + off;
276	return len;
277}
278
279static int __init pdc_chassis_create_procfs(void)
280{
281	unsigned long test;
282	int ret;
283
284	ret = pdc_chassis_warn(&test);
285	if ((ret == PDC_BAD_PROC) || (ret == PDC_BAD_OPTION)) {
286		/* seems that some boxes (eg L1000) do not implement this */
287		printk(KERN_INFO "Chassis warnings not supported.\n");
288		return 0;
289	}
290
291	printk(KERN_INFO "Enabling PDC chassis warnings support v%s\n",
292			PDC_CHASSIS_VER);
293	create_proc_read_entry("chassis", 0400, NULL, pdc_chassis_warn_pread,
294				NULL);
295	return 0;
296}
297
298__initcall(pdc_chassis_create_procfs);
299
300#endif /* CONFIG_PROC_FS */
301#endif /* CONFIG_PDC_CHASSIS_WARN */