aboutsummaryrefslogtreecommitdiff
path: root/arch/blackfin/kernel/cplbinfo.c
blob: 64d78300dd08ac967dce85cf6f2ca229459fba46 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
/*
 * arch/blackfin/kernel/cplbinfo.c - display CPLB status
 *
 * Copyright 2004-2008 Analog Devices Inc.
 * Licensed under the GPL-2 or later.
 */

#include <linux/ctype.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>

#include <asm/cplbinit.h>
#include <asm/blackfin.h>

static char const page_strtbl[][3] = { "1K", "4K", "1M", "4M" };
#define page(flags)    (((flags) & 0x30000) >> 16)
#define strpage(flags) page_strtbl[page(flags)]

struct cplbinfo_data {
	loff_t pos;
	char cplb_type;
	u32 mem_control;
	struct cplb_entry *tbl;
	int switched;
};

static void cplbinfo_print_header(struct seq_file *m)
{
	seq_printf(m, "Index\tAddress\t\tData\tSize\tU/RD\tU/WR\tS/WR\tSwitch\n");
}

static int cplbinfo_nomore(struct cplbinfo_data *cdata)
{
	return cdata->pos >= MAX_CPLBS;
}

static int cplbinfo_show(struct seq_file *m, void *p)
{
	struct cplbinfo_data *cdata;
	unsigned long data, addr;
	loff_t pos;

	cdata = p;
	pos = cdata->pos;
	addr = cdata->tbl[pos].addr;
	data = cdata->tbl[pos].data;

	seq_printf(m,
		"%d\t0x%08lx\t%05lx\t%s\t%c\t%c\t%c\t%c\n",
		(int)pos, addr, data, strpage(data),
		(data & CPLB_USER_RD) ? 'Y' : 'N',
		(data & CPLB_USER_WR) ? 'Y' : 'N',
		(data & CPLB_SUPV_WR) ? 'Y' : 'N',
		pos < cdata->switched ? 'N' : 'Y');

	return 0;
}

static void cplbinfo_seq_init(struct cplbinfo_data *cdata, unsigned int cpu)
{
	if (cdata->cplb_type == 'I') {
		cdata->mem_control = bfin_read_IMEM_CONTROL();
		cdata->tbl = icplb_tbl[cpu];
		cdata->switched = first_switched_icplb;
	} else {
		cdata->mem_control = bfin_read_DMEM_CONTROL();
		cdata->tbl = dcplb_tbl[cpu];
		cdata->switched = first_switched_dcplb;
	}
}

static void *cplbinfo_start(struct seq_file *m, loff_t *pos)
{
	struct cplbinfo_data *cdata = m->private;

	if (!*pos) {
		seq_printf(m, "%cCPLBs are %sabled: 0x%x\n", cdata->cplb_type,
			(cdata->mem_control & ENDCPLB ? "en" : "dis"),
			cdata->mem_control);
		cplbinfo_print_header(m);
	} else if (cplbinfo_nomore(cdata))
		return NULL;

	get_cpu();
	return cdata;
}

static void *cplbinfo_next(struct seq_file *m, void *p, loff_t *pos)
{
	struct cplbinfo_data *cdata = p;
	cdata->pos = ++(*pos);
	if (cplbinfo_nomore(cdata))
		return NULL;
	else
		return cdata;
}

static void cplbinfo_stop(struct seq_file *m, void *p)
{
	put_cpu();
}

static const struct seq_operations cplbinfo_sops = {
	.start = cplbinfo_start,
	.next  = cplbinfo_next,
	.stop  = cplbinfo_stop,
	.show  = cplbinfo_show,
};

static int cplbinfo_open(struct inode *inode, struct file *file)
{
	char buf[256], *path, *p;
	unsigned int cpu;
	char *s_cpu, *s_cplb;
	int ret;
	struct seq_file *m;
	struct cplbinfo_data *cdata;

	path = d_path(&file->f_path, buf, sizeof(buf));
	if (IS_ERR(path))
		return PTR_ERR(path);
	s_cpu = strstr(path, "/cpu");
	s_cplb = strrchr(path, '/');
	if (!s_cpu || !s_cplb)
		return -EINVAL;

	cpu = simple_strtoul(s_cpu + 4, &p, 10);
	if (!cpu_online(cpu))
		return -ENODEV;

	ret = seq_open_private(file, &cplbinfo_sops, sizeof(*cdata));
	if (ret)
		return ret;
	m = file->private_data;
	cdata = m->private;

	cdata->pos = 0;
	cdata->cplb_type = toupper(s_cplb[1]);
	cplbinfo_seq_init(cdata, cpu);

	return 0;
}

static const struct file_operations cplbinfo_fops = {
	.open    = cplbinfo_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = seq_release_private,
};

static int __init cplbinfo_init(void)
{
	struct proc_dir_entry *cplb_dir, *cpu_dir;
	char buf[10];
	unsigned int cpu;

	cplb_dir = proc_mkdir("cplbinfo", NULL);
	if (!cplb_dir)
		return -ENOMEM;

	for_each_possible_cpu(cpu) {
		sprintf(buf, "cpu%i", cpu);
		cpu_dir = proc_mkdir(buf, cplb_dir);
		if (!cpu_dir)
			return -ENOMEM;

		proc_create("icplb", S_IRUGO, cpu_dir, &cplbinfo_fops);
		proc_create("dcplb", S_IRUGO, cpu_dir, &cplbinfo_fops);
	}

	return 0;
}
late_initcall(cplbinfo_init);