1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License.  See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1999,2001-2004, 2006 Silicon Graphics, Inc.  All Rights Reserved.
7 *
8 * Module to export the system's Firmware Interface Tables, including
9 * PROM revision numbers and banners, in /proc
10 */
11#include <linux/module.h>
12#include <linux/slab.h>
13#include <linux/proc_fs.h>
14#include <linux/seq_file.h>
15#include <linux/nodemask.h>
16#include <asm/io.h>
17#include <asm/sn/sn_sal.h>
18#include <asm/sn/sn_cpuid.h>
19#include <asm/sn/addrs.h>
20
21MODULE_DESCRIPTION("PROM version reporting for /proc");
22MODULE_AUTHOR("Chad Talbott");
23MODULE_LICENSE("GPL");
24
25/* Standard Intel FIT entry types */
26#define FIT_ENTRY_FIT_HEADER	0x00	/* FIT header entry */
27#define FIT_ENTRY_PAL_B		0x01	/* PAL_B entry */
28/* Entries 0x02 through 0x0D reserved by Intel */
29#define FIT_ENTRY_PAL_A_PROC	0x0E	/* Processor-specific PAL_A entry */
30#define FIT_ENTRY_PAL_A		0x0F	/* PAL_A entry, same as... */
31#define FIT_ENTRY_PAL_A_GEN	0x0F	/* ...Generic PAL_A entry */
32#define FIT_ENTRY_UNUSED	0x7F	/* Unused (reserved by Intel?) */
33/* OEM-defined entries range from 0x10 to 0x7E. */
34#define FIT_ENTRY_SAL_A		0x10	/* SAL_A entry */
35#define FIT_ENTRY_SAL_B		0x11	/* SAL_B entry */
36#define FIT_ENTRY_SALRUNTIME	0x12	/* SAL runtime entry */
37#define FIT_ENTRY_EFI		0x1F	/* EFI entry */
38#define FIT_ENTRY_FPSWA		0x20	/* embedded fpswa entry */
39#define FIT_ENTRY_VMLINUX	0x21	/* embedded vmlinux entry */
40
41#define FIT_MAJOR_SHIFT	(32 + 8)
42#define FIT_MAJOR_MASK	((1 << 8) - 1)
43#define FIT_MINOR_SHIFT	32
44#define FIT_MINOR_MASK	((1 << 8) - 1)
45
46#define FIT_MAJOR(q)	\
47	((unsigned) ((q) >> FIT_MAJOR_SHIFT) & FIT_MAJOR_MASK)
48#define FIT_MINOR(q)	\
49	((unsigned) ((q) >> FIT_MINOR_SHIFT) & FIT_MINOR_MASK)
50
51#define FIT_TYPE_SHIFT	(32 + 16)
52#define FIT_TYPE_MASK	((1 << 7) - 1)
53
54#define FIT_TYPE(q)	\
55	((unsigned) ((q) >> FIT_TYPE_SHIFT) & FIT_TYPE_MASK)
56
57struct fit_type_map_t {
58	unsigned char type;
59	const char *name;
60};
61
62static const struct fit_type_map_t fit_entry_types[] = {
63	{FIT_ENTRY_FIT_HEADER, "FIT Header"},
64	{FIT_ENTRY_PAL_A_GEN, "Generic PAL_A"},
65	{FIT_ENTRY_PAL_A_PROC, "Processor-specific PAL_A"},
66	{FIT_ENTRY_PAL_A, "PAL_A"},
67	{FIT_ENTRY_PAL_B, "PAL_B"},
68	{FIT_ENTRY_SAL_A, "SAL_A"},
69	{FIT_ENTRY_SAL_B, "SAL_B"},
70	{FIT_ENTRY_SALRUNTIME, "SAL runtime"},
71	{FIT_ENTRY_EFI, "EFI"},
72	{FIT_ENTRY_VMLINUX, "Embedded Linux"},
73	{FIT_ENTRY_FPSWA, "Embedded FPSWA"},
74	{FIT_ENTRY_UNUSED, "Unused"},
75	{0xff, "Error"},
76};
77
78static const char *fit_type_name(unsigned char type)
79{
80	struct fit_type_map_t const *mapp;
81
82	for (mapp = fit_entry_types; mapp->type != 0xff; mapp++)
83		if (type == mapp->type)
84			return mapp->name;
85
86	if ((type > FIT_ENTRY_PAL_A) && (type < FIT_ENTRY_UNUSED))
87		return "OEM type";
88	if ((type > FIT_ENTRY_PAL_B) && (type < FIT_ENTRY_PAL_A))
89		return "Reserved";
90
91	return "Unknown type";
92}
93
94static int
95get_fit_entry(unsigned long nasid, int index, unsigned long *fentry,
96	      char *banner, int banlen)
97{
98	return ia64_sn_get_fit_compt(nasid, index, fentry, banner, banlen);
99}
100
101
102/*
103 * These two routines display the FIT table for each node.
104 */
105static void dump_fit_entry(struct seq_file *m, unsigned long *fentry)
106{
107	unsigned type;
108
109	type = FIT_TYPE(fentry[1]);
110	seq_printf(m, "%02x %-25s %x.%02x %016lx %u\n",
111		   type,
112		   fit_type_name(type),
113		   FIT_MAJOR(fentry[1]), FIT_MINOR(fentry[1]),
114		   fentry[0],
115		   /* mult by sixteen to get size in bytes */
116		   (unsigned)(fentry[1] & 0xffffff) * 16);
117}
118
119
120/*
121 * We assume that the fit table will be small enough that we can print
122 * the whole thing into one page.  (This is true for our default 16kB
123 * pages -- each entry is about 60 chars wide when printed.)  I read
124 * somewhere that the maximum size of the FIT is 128 entries, so we're
125 * OK except for 4kB pages (and no one is going to do that on SN
126 * anyway).
127 */
128static int proc_fit_show(struct seq_file *m, void *v)
129{
130	unsigned long nasid = (unsigned long)m->private;
131	unsigned long fentry[2];
132	int index;
133
134	for (index=0;;index++) {
135		BUG_ON(index * 60 > PAGE_SIZE);
136		if (get_fit_entry(nasid, index, fentry, NULL, 0))
137			break;
138		dump_fit_entry(m, fentry);
139	}
140	return 0;
141}
142
143static int proc_fit_open(struct inode *inode, struct file *file)
144{
145	return single_open(file, proc_fit_show, PDE_DATA(inode));
146}
147
148static const struct file_operations proc_fit_fops = {
149	.open		= proc_fit_open,
150	.read		= seq_read,
151	.llseek		= seq_lseek,
152	.release	= single_release,
153};
154
155static int proc_version_show(struct seq_file *m, void *v)
156{
157	unsigned long nasid = (unsigned long)m->private;
158	unsigned long fentry[2];
159	char banner[128];
160	int index;
161
162	for (index = 0; ; index++) {
163		if (get_fit_entry(nasid, index, fentry, banner,
164				  sizeof(banner)))
165			return 0;
166		if (FIT_TYPE(fentry[1]) == FIT_ENTRY_SAL_A)
167			break;
168	}
169
170	seq_printf(m, "%x.%02x\n", FIT_MAJOR(fentry[1]), FIT_MINOR(fentry[1]));
171
172	if (banner[0])
173		seq_printf(m, "%s\n", banner);
174	return 0;
175}
176
177static int proc_version_open(struct inode *inode, struct file *file)
178{
179	return single_open(file, proc_version_show, PDE_DATA(inode));
180}
181
182static const struct file_operations proc_version_fops = {
183	.open		= proc_version_open,
184	.read		= seq_read,
185	.llseek		= seq_lseek,
186	.release	= single_release,
187};
188
189/* module entry points */
190int __init prominfo_init(void);
191void __exit prominfo_exit(void);
192
193module_init(prominfo_init);
194module_exit(prominfo_exit);
195
196#define NODE_NAME_LEN 11
197
198int __init prominfo_init(void)
199{
200	struct proc_dir_entry *sgi_prominfo_entry;
201	cnodeid_t cnodeid;
202
203	if (!ia64_platform_is("sn2"))
204		return 0;
205
206	sgi_prominfo_entry = proc_mkdir("sgi_prominfo", NULL);
207	if (!sgi_prominfo_entry)
208		return -ENOMEM;
209
210	for_each_online_node(cnodeid) {
211		struct proc_dir_entry *dir;
212		unsigned long nasid;
213		char name[NODE_NAME_LEN];
214
215		sprintf(name, "node%d", cnodeid);
216		dir = proc_mkdir(name, sgi_prominfo_entry);
217		if (!dir)
218			continue;
219		nasid = cnodeid_to_nasid(cnodeid);
220		proc_create_data("fit", 0, dir,
221				 &proc_fit_fops, (void *)nasid);
222		proc_create_data("version", 0, dir,
223				 &proc_version_fops, (void *)nasid);
224	}
225	return 0;
226}
227
228void __exit prominfo_exit(void)
229{
230	remove_proc_subtree("sgi_prominfo", NULL);
231}
232