Blackfin arch: don't accidently re-enable interrupts
[linux-2.6] / arch / blackfin / kernel / cplbinfo.c
1 /*
2  * arch/blackfin/kernel/cplbinfo.c - display CPLB status
3  *
4  * Copyright 2004-2008 Analog Devices Inc.
5  * Licensed under the GPL-2 or later.
6  */
7
8 #include <linux/ctype.h>
9 #include <linux/module.h>
10 #include <linux/kernel.h>
11 #include <linux/init.h>
12 #include <linux/proc_fs.h>
13 #include <linux/seq_file.h>
14 #include <linux/uaccess.h>
15
16 #include <asm/cplbinit.h>
17 #include <asm/blackfin.h>
18
19 static char const page_strtbl[][3] = { "1K", "4K", "1M", "4M" };
20 #define page(flags)    (((flags) & 0x30000) >> 16)
21 #define strpage(flags) page_strtbl[page(flags)]
22
23 struct cplbinfo_data {
24         loff_t pos;
25         char cplb_type;
26         u32 mem_control;
27         struct cplb_entry *tbl;
28         int switched;
29 };
30
31 static void cplbinfo_print_header(struct seq_file *m)
32 {
33         seq_printf(m, "Index\tAddress\t\tData\tSize\tU/RD\tU/WR\tS/WR\tSwitch\n");
34 }
35
36 static int cplbinfo_nomore(struct cplbinfo_data *cdata)
37 {
38         return cdata->pos >= MAX_CPLBS;
39 }
40
41 static int cplbinfo_show(struct seq_file *m, void *p)
42 {
43         struct cplbinfo_data *cdata;
44         unsigned long data, addr;
45         loff_t pos;
46
47         cdata = p;
48         pos = cdata->pos;
49         addr = cdata->tbl[pos].addr;
50         data = cdata->tbl[pos].data;
51
52         seq_printf(m,
53                 "%d\t0x%08lx\t%05lx\t%s\t%c\t%c\t%c\t%c\n",
54                 (int)pos, addr, data, strpage(data),
55                 (data & CPLB_USER_RD) ? 'Y' : 'N',
56                 (data & CPLB_USER_WR) ? 'Y' : 'N',
57                 (data & CPLB_SUPV_WR) ? 'Y' : 'N',
58                 pos < cdata->switched ? 'N' : 'Y');
59
60         return 0;
61 }
62
63 static void cplbinfo_seq_init(struct cplbinfo_data *cdata, unsigned int cpu)
64 {
65         if (cdata->cplb_type == 'I') {
66                 cdata->mem_control = bfin_read_IMEM_CONTROL();
67                 cdata->tbl = icplb_tbl[cpu];
68                 cdata->switched = first_switched_icplb;
69         } else {
70                 cdata->mem_control = bfin_read_DMEM_CONTROL();
71                 cdata->tbl = dcplb_tbl[cpu];
72                 cdata->switched = first_switched_dcplb;
73         }
74 }
75
76 static void *cplbinfo_start(struct seq_file *m, loff_t *pos)
77 {
78         struct cplbinfo_data *cdata = m->private;
79
80         if (!*pos) {
81                 seq_printf(m, "%cCPLBs are %sabled: 0x%x\n", cdata->cplb_type,
82                         (cdata->mem_control & ENDCPLB ? "en" : "dis"),
83                         cdata->mem_control);
84                 cplbinfo_print_header(m);
85         } else if (cplbinfo_nomore(cdata))
86                 return NULL;
87
88         get_cpu();
89         return cdata;
90 }
91
92 static void *cplbinfo_next(struct seq_file *m, void *p, loff_t *pos)
93 {
94         struct cplbinfo_data *cdata = p;
95         cdata->pos = ++(*pos);
96         if (cplbinfo_nomore(cdata))
97                 return NULL;
98         else
99                 return cdata;
100 }
101
102 static void cplbinfo_stop(struct seq_file *m, void *p)
103 {
104         put_cpu();
105 }
106
107 static const struct seq_operations cplbinfo_sops = {
108         .start = cplbinfo_start,
109         .next  = cplbinfo_next,
110         .stop  = cplbinfo_stop,
111         .show  = cplbinfo_show,
112 };
113
114 static int cplbinfo_open(struct inode *inode, struct file *file)
115 {
116         char buf[256], *path, *p;
117         unsigned int cpu;
118         char *s_cpu, *s_cplb;
119         int ret;
120         struct seq_file *m;
121         struct cplbinfo_data *cdata;
122
123         path = d_path(&file->f_path, buf, sizeof(buf));
124         if (IS_ERR(path))
125                 return PTR_ERR(path);
126         s_cpu = strstr(path, "/cpu");
127         s_cplb = strrchr(path, '/');
128         if (!s_cpu || !s_cplb)
129                 return -EINVAL;
130
131         cpu = simple_strtoul(s_cpu + 4, &p, 10);
132         if (!cpu_online(cpu))
133                 return -ENODEV;
134
135         ret = seq_open_private(file, &cplbinfo_sops, sizeof(*cdata));
136         if (ret)
137                 return ret;
138         m = file->private_data;
139         cdata = m->private;
140
141         cdata->pos = 0;
142         cdata->cplb_type = toupper(s_cplb[1]);
143         cplbinfo_seq_init(cdata, cpu);
144
145         return 0;
146 }
147
148 static const struct file_operations cplbinfo_fops = {
149         .open    = cplbinfo_open,
150         .read    = seq_read,
151         .llseek  = seq_lseek,
152         .release = seq_release_private,
153 };
154
155 static int __init cplbinfo_init(void)
156 {
157         struct proc_dir_entry *cplb_dir, *cpu_dir;
158         char buf[10];
159         unsigned int cpu;
160
161         cplb_dir = proc_mkdir("cplbinfo", NULL);
162         if (!cplb_dir)
163                 return -ENOMEM;
164
165         for_each_possible_cpu(cpu) {
166                 sprintf(buf, "cpu%i", cpu);
167                 cpu_dir = proc_mkdir(buf, cplb_dir);
168                 if (!cpu_dir)
169                         return -ENOMEM;
170
171                 proc_create("icplb", S_IRUGO, cpu_dir, &cplbinfo_fops);
172                 proc_create("dcplb", S_IRUGO, cpu_dir, &cplbinfo_fops);
173         }
174
175         return 0;
176 }
177 late_initcall(cplbinfo_init);