1/*
2 * arch/blackfin/kernel/cplbinfo.c - display CPLB status
3 *
4 * Copyright 2004-2008 Analog Devices Inc.
5 *
6 * Licensed under the GPL-2 or later.
7 */
8
9#include <linux/ctype.h>
10#include <linux/module.h>
11#include <linux/kernel.h>
12#include <linux/init.h>
13#include <linux/proc_fs.h>
14#include <linux/seq_file.h>
15#include <linux/uaccess.h>
16
17#include <asm/cplbinit.h>
18#include <asm/blackfin.h>
19
20static char const page_strtbl[][4] = {
21	"1K", "4K", "1M", "4M",
22#ifdef CONFIG_BF60x
23	"16K", "64K", "16M", "64M",
24#endif
25};
26#define page(flags)    (((flags) & 0x70000) >> 16)
27#define strpage(flags) page_strtbl[page(flags)]
28
29struct cplbinfo_data {
30	loff_t pos;
31	char cplb_type;
32	u32 mem_control;
33	struct cplb_entry *tbl;
34	int switched;
35};
36
37static void cplbinfo_print_header(struct seq_file *m)
38{
39	seq_printf(m, "Index\tAddress\t\tData\tSize\tU/RD\tU/WR\tS/WR\tSwitch\n");
40}
41
42static int cplbinfo_nomore(struct cplbinfo_data *cdata)
43{
44	return cdata->pos >= MAX_CPLBS;
45}
46
47static int cplbinfo_show(struct seq_file *m, void *p)
48{
49	struct cplbinfo_data *cdata;
50	unsigned long data, addr;
51	loff_t pos;
52
53	cdata = p;
54	pos = cdata->pos;
55	addr = cdata->tbl[pos].addr;
56	data = cdata->tbl[pos].data;
57
58	seq_printf(m,
59		"%d\t0x%08lx\t%05lx\t%s\t%c\t%c\t%c\t%c\n",
60		(int)pos, addr, data, strpage(data),
61		(data & CPLB_USER_RD) ? 'Y' : 'N',
62		(data & CPLB_USER_WR) ? 'Y' : 'N',
63		(data & CPLB_SUPV_WR) ? 'Y' : 'N',
64		pos < cdata->switched ? 'N' : 'Y');
65
66	return 0;
67}
68
69static void cplbinfo_seq_init(struct cplbinfo_data *cdata, unsigned int cpu)
70{
71	if (cdata->cplb_type == 'I') {
72		cdata->mem_control = bfin_read_IMEM_CONTROL();
73		cdata->tbl = icplb_tbl[cpu];
74		cdata->switched = first_switched_icplb;
75	} else {
76		cdata->mem_control = bfin_read_DMEM_CONTROL();
77		cdata->tbl = dcplb_tbl[cpu];
78		cdata->switched = first_switched_dcplb;
79	}
80}
81
82static void *cplbinfo_start(struct seq_file *m, loff_t *pos)
83{
84	struct cplbinfo_data *cdata = m->private;
85
86	if (!*pos) {
87		seq_printf(m, "%cCPLBs are %sabled: 0x%x\n", cdata->cplb_type,
88			(cdata->mem_control & ENDCPLB ? "en" : "dis"),
89			cdata->mem_control);
90		cplbinfo_print_header(m);
91	} else if (cplbinfo_nomore(cdata))
92		return NULL;
93
94	get_cpu();
95	return cdata;
96}
97
98static void *cplbinfo_next(struct seq_file *m, void *p, loff_t *pos)
99{
100	struct cplbinfo_data *cdata = p;
101	cdata->pos = ++(*pos);
102	if (cplbinfo_nomore(cdata))
103		return NULL;
104	else
105		return cdata;
106}
107
108static void cplbinfo_stop(struct seq_file *m, void *p)
109{
110	put_cpu();
111}
112
113static const struct seq_operations cplbinfo_sops = {
114	.start = cplbinfo_start,
115	.next  = cplbinfo_next,
116	.stop  = cplbinfo_stop,
117	.show  = cplbinfo_show,
118};
119
120#define CPLBINFO_DCPLB_FLAG 0x80000000
121
122static int cplbinfo_open(struct inode *inode, struct file *file)
123{
124	char cplb_type;
125	unsigned int cpu = (unsigned long)PDE_DATA(file_inode(file));
126	int ret;
127	struct seq_file *m;
128	struct cplbinfo_data *cdata;
129
130	cplb_type = cpu & CPLBINFO_DCPLB_FLAG ? 'D' : 'I';
131	cpu &= ~CPLBINFO_DCPLB_FLAG;
132
133	if (!cpu_online(cpu))
134		return -ENODEV;
135
136	ret = seq_open_private(file, &cplbinfo_sops, sizeof(*cdata));
137	if (ret)
138		return ret;
139	m = file->private_data;
140	cdata = m->private;
141
142	cdata->pos = 0;
143	cdata->cplb_type = cplb_type;
144	cplbinfo_seq_init(cdata, cpu);
145
146	return 0;
147}
148
149static const struct file_operations cplbinfo_fops = {
150	.open    = cplbinfo_open,
151	.read    = seq_read,
152	.llseek  = seq_lseek,
153	.release = seq_release_private,
154};
155
156static int __init cplbinfo_init(void)
157{
158	struct proc_dir_entry *cplb_dir, *cpu_dir;
159	char buf[10];
160	unsigned int cpu;
161
162	cplb_dir = proc_mkdir("cplbinfo", NULL);
163	if (!cplb_dir)
164		return -ENOMEM;
165
166	for_each_possible_cpu(cpu) {
167		sprintf(buf, "cpu%i", cpu);
168		cpu_dir = proc_mkdir(buf, cplb_dir);
169		if (!cpu_dir)
170			return -ENOMEM;
171
172		proc_create_data("icplb", S_IRUGO, cpu_dir, &cplbinfo_fops,
173			(void *)cpu);
174		proc_create_data("dcplb", S_IRUGO, cpu_dir, &cplbinfo_fops,
175			(void *)(cpu | CPLBINFO_DCPLB_FLAG));
176	}
177
178	return 0;
179}
180late_initcall(cplbinfo_init);
181