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;
27 u32 mem_control;
28 struct cplb_entry *tbl;
29 int switched;
30 };
31
cplbinfo_print_header(struct seq_file * m)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
cplbinfo_nomore(struct cplbinfo_data * cdata)37 static int cplbinfo_nomore(struct cplbinfo_data *cdata)
38 {
39 return cdata->pos >= MAX_CPLBS;
40 }
41
cplbinfo_show(struct seq_file * m,void * p)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
cplbinfo_seq_init(struct cplbinfo_data * cdata,unsigned int cpu)64 static void cplbinfo_seq_init(struct cplbinfo_data *cdata, unsigned int cpu)
65 {
66 if (cdata->cplb_type == 'I') {
67 cdata->mem_control = bfin_read_IMEM_CONTROL();
68 cdata->tbl = icplb_tbl[cpu];
69 cdata->switched = first_switched_icplb;
70 } else {
71 cdata->mem_control = bfin_read_DMEM_CONTROL();
72 cdata->tbl = dcplb_tbl[cpu];
73 cdata->switched = first_switched_dcplb;
74 }
75 }
76
cplbinfo_start(struct seq_file * m,loff_t * pos)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
cplbinfo_next(struct seq_file * m,void * p,loff_t * pos)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
cplbinfo_stop(struct seq_file * m,void * p)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
cplbinfo_open(struct inode * inode,struct file * file)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
cplbinfo_init(void)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);
178