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   1 /*
   2  * arch/blackfin/kernel/cplbinfo.c - display CPLB status
   3  *
   4  * Copyright 2004-2008 Analog Devices Inc.
   5  * Licensed under the GPL-2 or later.
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/kernel.h>
  10 #include <linux/init.h>
  11 #include <linux/proc_fs.h>
  12 #include <linux/uaccess.h>
  13
  14 #include <asm/cplbinit.h>
  15 #include <asm/blackfin.h>
  16
  17 typedef enum { ICPLB, DCPLB } cplb_type;
  18
  19 static char page_strtbl[][3] = { "1K", "4K", "1M", "4M" };
  20 #define page(flags)    (((flags) & 0x30000) >> 16)
  21 #define strpage(flags) page_strtbl[page(flags)]
  22
  23 #ifdef CONFIG_MPU
  24
  25 static char *cplb_print_entry(char *buf, cplb_type type, unsigned int cpu)
  26 {
  27         struct cplb_entry *tbl;
  28         int switched;
  29         int i;
  30
  31         if (type == ICPLB) {
  32                 tbl = icplb_tbl[cpu];
  33                 switched = first_switched_icplb;
  34         } else {
  35                 tbl = dcplb_tbl[cpu];
  36                 switched = first_switched_dcplb;
  37         }
  38
  39         buf += sprintf(buf, "Index\tAddress\t\tData\tSize\tU/RD\tU/WR\tS/WR\tSwitch\n");
  40         for (i = 0; i < MAX_CPLBS; ++i) {
  41                 unsigned long data = tbl[i].data;
  42                 unsigned long addr = tbl[i].addr;
  43
  44                 if (!(data & CPLB_VALID))
  45                         continue;
  46
  47                 buf += sprintf(buf,
  48                         "%d\t0x%08lx\t%05lx\t%s\t%c\t%c\t%c\t%c\n",
  49                         i, addr, data, strpage(data),
  50                         (data & CPLB_USER_RD) ? 'Y' : 'N',
  51                         (data & CPLB_USER_WR) ? 'Y' : 'N',
  52                         (data & CPLB_SUPV_WR) ? 'Y' : 'N',
  53                         i < switched ? 'N' : 'Y');
  54         }
  55         buf += sprintf(buf, "\n");
  56
  57         return buf;
  58 }
  59
  60 #else
  61
  62 extern int page_size_table[];
  63
  64 static int cplb_find_entry(unsigned long *cplb_addr,
  65                            unsigned long *cplb_data, unsigned long addr,
  66                            unsigned long data)
  67 {
  68         int i;
  69
  70         for (i = 0; i < 16; ++i)
  71                 if (addr >= cplb_addr[i] &&
  72                     addr < cplb_addr[i] + page_size_table[page(cplb_data[i])] &&
  73                     cplb_data[i] == data)
  74                         return i;
  75
  76         return -1;
  77 }
  78
  79 static char *cplb_print_entry(char *buf, cplb_type type, unsigned int cpu)
  80 {
  81         unsigned long *p_addr, *p_data, *p_icount, *p_ocount;
  82         unsigned long *cplb_addr, *cplb_data;
  83         int entry = 0, used_cplb = 0;
  84
  85         if (type == ICPLB) {
  86                 p_addr = ipdt_tables[cpu];
  87                 p_data = ipdt_tables[cpu] + 1;
  88                 p_icount = ipdt_swapcount_tables[cpu];
  89                 p_ocount = ipdt_swapcount_tables[cpu] + 1;
  90                 cplb_addr = (unsigned long *)ICPLB_ADDR0;
  91                 cplb_data = (unsigned long *)ICPLB_DATA0;
  92         } else {
  93                 p_addr = dpdt_tables[cpu];
  94                 p_data = dpdt_tables[cpu] + 1;
  95                 p_icount = dpdt_swapcount_tables[cpu];
  96                 p_ocount = dpdt_swapcount_tables[cpu] + 1;
  97                 cplb_addr = (unsigned long *)DCPLB_ADDR0;
  98                 cplb_data = (unsigned long *)DCPLB_DATA0;
  99         }
 100
 101         buf += sprintf(buf, "Address\t\tData\tSize\tValid\tLocked\tSwapin\tiCount\toCount\n");
 102
 103         while (*p_addr != 0xffffffff) {
 104                 entry = cplb_find_entry(cplb_addr, cplb_data, *p_addr, *p_data);
 105                 if (entry >= 0)
 106                         used_cplb |= 1 << entry;
 107
 108                 buf += sprintf(buf,
 109                         "0x%08lx\t0x%05lx\t%s\t%c\t%c\t%2d\t%ld\t%ld\n",
 110                         *p_addr, *p_data, strpage(*p_data),
 111                         (*p_data & CPLB_VALID) ? 'Y' : 'N',
 112                         (*p_data & CPLB_LOCK) ? 'Y' : 'N', entry, *p_icount,
 113                         *p_ocount);
 114
 115                 p_addr += 2;
 116                 p_data += 2;
 117                 p_icount += 2;
 118                 p_ocount += 2;
 119         }
 120
 121         if (used_cplb != 0xffff) {
 122                 buf += sprintf(buf, "Unused/mismatched CPLBs:\n");
 123
 124                 for (entry = 0; entry < 16; ++entry)
 125                         if (0 == ((1 << entry) & used_cplb)) {
 126                                 int flags = cplb_data[entry];
 127                                 buf += sprintf(buf,
 128                                         "%2d: 0x%08lx\t0x%05x\t%s\t%c\t%c\n",
 129                                         entry, cplb_addr[entry], flags, strpage(flags),
 130                                         (flags & CPLB_VALID) ? 'Y' : 'N',
 131                                         (flags & CPLB_LOCK) ? 'Y' : 'N');
 132                         }
 133         }
 134
 135         buf += sprintf(buf, "\n");
 136
 137         return buf;
 138 }
 139
 140 #endif
 141
 142 static int cplbinfo_proc_output(char *buf, void *data)
 143 {
 144         unsigned int cpu = (unsigned int)data;
 145         char *p = buf;
 146
 147         if (bfin_read_IMEM_CONTROL() & ENICPLB) {
 148                 p += sprintf(p, "Instruction CPLB entry:\n");
 149                 p = cplb_print_entry(p, ICPLB, cpu);
 150         } else
 151                 p += sprintf(p, "Instruction CPLB is disabled.\n\n");
 152
 153         if (bfin_read_DMEM_CONTROL() & ENDCPLB) {
 154                 p += sprintf(p, "Data CPLB entry:\n");
 155                 p = cplb_print_entry(p, DCPLB, cpu);
 156         } else
 157                 p += sprintf(p, "Data CPLB is disabled.\n\n");
 158
 159         return p - buf;
 160 }
 161
 162 static int cplbinfo_read_proc(char *page, char **start, off_t off,
 163                               int count, int *eof, void *data)
 164 {
 165         int len = cplbinfo_proc_output(page, data);
 166         if (len <= off + count)
 167                 *eof = 1;
 168         *start = page + off;
 169         len -= off;
 170         return max(min(len, count), 0);
 171 }
 172
 173 static int __init cplbinfo_init(void)
 174 {
 175         struct proc_dir_entry *parent, *entry;
 176         unsigned int cpu;
 177         unsigned char str[10];
 178
 179         parent = proc_mkdir("cplbinfo", NULL);
 180         if (!parent)
 181                 return -ENOMEM;
 182
 183         for_each_online_cpu(cpu) {
 184                 sprintf(str, "cpu%u", cpu);
 185                 entry = create_proc_entry(str, 0, parent);
 186                 if (!entry)
 187                         return -ENOMEM;
 188
 189                 entry->read_proc = cplbinfo_read_proc;
 190                 entry->data = (void *)cpu;
 191         }
 192
 193         return 0;
 194 }
 195 late_initcall(cplbinfo_init);