Linux Kernel  3.7.1
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cplbinfo.c
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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 
20 static char const page_strtbl[][3] = { "1K", "4K", "1M", "4M" };
21 #define page(flags) (((flags) & 0x30000) >> 16)
22 #define strpage(flags) page_strtbl[page(flags)]
23 
24 struct cplbinfo_data {
25  loff_t pos;
26  char cplb_type;
28  struct cplb_entry *tbl;
29  int switched;
30 };
31 
32 static void cplbinfo_print_header(struct seq_file *m)
33 {
34  seq_printf(m, "Index\tAddress\t\tData\tSize\tU/RD\tU/WR\tS/WR\tSwitch\n");
35 }
36 
37 static int cplbinfo_nomore(struct cplbinfo_data *cdata)
38 {
39  return cdata->pos >= MAX_CPLBS;
40 }
41 
42 static int cplbinfo_show(struct seq_file *m, void *p)
43 {
44  struct cplbinfo_data *cdata;
45  unsigned long data, addr;
46  loff_t pos;
47 
48  cdata = p;
49  pos = cdata->pos;
50  addr = cdata->tbl[pos].addr;
51  data = cdata->tbl[pos].data;
52 
53  seq_printf(m,
54  "%d\t0x%08lx\t%05lx\t%s\t%c\t%c\t%c\t%c\n",
55  (int)pos, addr, data, strpage(data),
56  (data & CPLB_USER_RD) ? 'Y' : 'N',
57  (data & CPLB_USER_WR) ? 'Y' : 'N',
58  (data & CPLB_SUPV_WR) ? 'Y' : 'N',
59  pos < cdata->switched ? 'N' : 'Y');
60 
61  return 0;
62 }
63 
64 static void cplbinfo_seq_init(struct cplbinfo_data *cdata, unsigned int cpu)
65 {
66  if (cdata->cplb_type == 'I') {
68  cdata->tbl = icplb_tbl[cpu];
70  } else {
72  cdata->tbl = dcplb_tbl[cpu];
74  }
75 }
76 
77 static void *cplbinfo_start(struct seq_file *m, loff_t *pos)
78 {
79  struct cplbinfo_data *cdata = m->private;
80 
81  if (!*pos) {
82  seq_printf(m, "%cCPLBs are %sabled: 0x%x\n", cdata->cplb_type,
83  (cdata->mem_control & ENDCPLB ? "en" : "dis"),
84  cdata->mem_control);
85  cplbinfo_print_header(m);
86  } else if (cplbinfo_nomore(cdata))
87  return NULL;
88 
89  get_cpu();
90  return cdata;
91 }
92 
93 static void *cplbinfo_next(struct seq_file *m, void *p, loff_t *pos)
94 {
95  struct cplbinfo_data *cdata = p;
96  cdata->pos = ++(*pos);
97  if (cplbinfo_nomore(cdata))
98  return NULL;
99  else
100  return cdata;
101 }
102 
103 static void cplbinfo_stop(struct seq_file *m, void *p)
104 {
105  put_cpu();
106 }
107 
108 static const struct seq_operations cplbinfo_sops = {
109  .start = cplbinfo_start,
110  .next = cplbinfo_next,
111  .stop = cplbinfo_stop,
112  .show = cplbinfo_show,
113 };
114 
115 #define CPLBINFO_DCPLB_FLAG 0x80000000
116 
117 static int cplbinfo_open(struct inode *inode, struct file *file)
118 {
119  struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
120  char cplb_type;
121  unsigned int cpu;
122  int ret;
123  struct seq_file *m;
124  struct cplbinfo_data *cdata;
125 
126  cpu = (unsigned int)pde->data;
127  cplb_type = cpu & CPLBINFO_DCPLB_FLAG ? 'D' : 'I';
128  cpu &= ~CPLBINFO_DCPLB_FLAG;
129 
130  if (!cpu_online(cpu))
131  return -ENODEV;
132 
133  ret = seq_open_private(file, &cplbinfo_sops, sizeof(*cdata));
134  if (ret)
135  return ret;
136  m = file->private_data;
137  cdata = m->private;
138 
139  cdata->pos = 0;
140  cdata->cplb_type = cplb_type;
141  cplbinfo_seq_init(cdata, cpu);
142 
143  return 0;
144 }
145 
146 static const struct file_operations cplbinfo_fops = {
147  .open = cplbinfo_open,
148  .read = seq_read,
149  .llseek = seq_lseek,
150  .release = seq_release_private,
151 };
152 
153 static int __init cplbinfo_init(void)
154 {
155  struct proc_dir_entry *cplb_dir, *cpu_dir;
156  char buf[10];
157  unsigned int cpu;
158 
159  cplb_dir = proc_mkdir("cplbinfo", NULL);
160  if (!cplb_dir)
161  return -ENOMEM;
162 
163  for_each_possible_cpu(cpu) {
164  sprintf(buf, "cpu%i", cpu);
165  cpu_dir = proc_mkdir(buf, cplb_dir);
166  if (!cpu_dir)
167  return -ENOMEM;
168 
169  proc_create_data("icplb", S_IRUGO, cpu_dir, &cplbinfo_fops,
170  (void *)cpu);
171  proc_create_data("dcplb", S_IRUGO, cpu_dir, &cplbinfo_fops,
172  (void *)(cpu | CPLBINFO_DCPLB_FLAG));
173  }
174 
175  return 0;
176 }
177 late_initcall(cplbinfo_init);