2 * arch/blackfin/kernel/cplbinfo.c - display CPLB status
4 * Copyright 2004-2008 Analog Devices Inc.
5 * Licensed under the GPL-2 or later.
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>
16 #include <asm/cplbinit.h>
17 #include <asm/blackfin.h>
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)]
23 struct cplbinfo_data {
27 struct cplb_entry *tbl;
31 static void cplbinfo_print_header(struct seq_file *m)
33 seq_printf(m, "Index\tAddress\t\tData\tSize\tU/RD\tU/WR\tS/WR\tSwitch\n");
36 static int cplbinfo_nomore(struct cplbinfo_data *cdata)
38 return cdata->pos >= MAX_CPLBS;
41 static int cplbinfo_show(struct seq_file *m, void *p)
43 struct cplbinfo_data *cdata;
44 unsigned long data, addr;
49 addr = cdata->tbl[pos].addr;
50 data = cdata->tbl[pos].data;
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');
63 static void cplbinfo_seq_init(struct cplbinfo_data *cdata, unsigned int cpu)
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;
70 cdata->mem_control = bfin_read_DMEM_CONTROL();
71 cdata->tbl = dcplb_tbl[cpu];
72 cdata->switched = first_switched_dcplb;
76 static void *cplbinfo_start(struct seq_file *m, loff_t *pos)
78 struct cplbinfo_data *cdata = m->private;
81 seq_printf(m, "%cCPLBs are %sabled: 0x%x\n", cdata->cplb_type,
82 (cdata->mem_control & ENDCPLB ? "en" : "dis"),
84 cplbinfo_print_header(m);
85 } else if (cplbinfo_nomore(cdata))
92 static void *cplbinfo_next(struct seq_file *m, void *p, loff_t *pos)
94 struct cplbinfo_data *cdata = p;
95 cdata->pos = ++(*pos);
96 if (cplbinfo_nomore(cdata))
102 static void cplbinfo_stop(struct seq_file *m, void *p)
107 static const struct seq_operations cplbinfo_sops = {
108 .start = cplbinfo_start,
109 .next = cplbinfo_next,
110 .stop = cplbinfo_stop,
111 .show = cplbinfo_show,
114 static int cplbinfo_open(struct inode *inode, struct file *file)
116 char buf[256], *path, *p;
118 char *s_cpu, *s_cplb;
121 struct cplbinfo_data *cdata;
123 path = d_path(&file->f_path, buf, sizeof(buf));
125 return PTR_ERR(path);
126 s_cpu = strstr(path, "/cpu");
127 s_cplb = strrchr(path, '/');
128 if (!s_cpu || !s_cplb)
131 cpu = simple_strtoul(s_cpu + 4, &p, 10);
132 if (!cpu_online(cpu))
135 ret = seq_open_private(file, &cplbinfo_sops, sizeof(*cdata));
138 m = file->private_data;
142 cdata->cplb_type = toupper(s_cplb[1]);
143 cplbinfo_seq_init(cdata, cpu);
148 static const struct file_operations cplbinfo_fops = {
149 .open = cplbinfo_open,
152 .release = seq_release_private,
155 static int __init cplbinfo_init(void)
157 struct proc_dir_entry *cplb_dir, *cpu_dir;
161 cplb_dir = proc_mkdir("cplbinfo", NULL);
165 for_each_possible_cpu(cpu) {
166 sprintf(buf, "cpu%i", cpu);
167 cpu_dir = proc_mkdir(buf, cplb_dir);
171 proc_create("icplb", S_IRUGO, cpu_dir, &cplbinfo_fops);
172 proc_create("dcplb", S_IRUGO, cpu_dir, &cplbinfo_fops);
177 late_initcall(cplbinfo_init);