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Linux/arch/blackfin/kernel/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[][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 
 29 struct cplbinfo_data {
 30         loff_t pos;
 31         char cplb_type;
 32         u32 mem_control;
 33         struct cplb_entry *tbl;
 34         int switched;
 35 };
 36 
 37 static 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 
 42 static int cplbinfo_nomore(struct cplbinfo_data *cdata)
 43 {
 44         return cdata->pos >= MAX_CPLBS;
 45 }
 46 
 47 static 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 
 69 static 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 
 82 static 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 
 98 static 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 
108 static void cplbinfo_stop(struct seq_file *m, void *p)
109 {
110         put_cpu();
111 }
112 
113 static 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 
122 static 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 
149 static 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 
156 static 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 }
180 late_initcall(cplbinfo_init);
181 

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