arch/blackfin/kernel/cplbinfo.c

   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);