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[][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
  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
  37 static int cplbinfo_nomore(struct cplbinfo_data *cdata)
  38 {
  39         return cdata->pos >= MAX_CPLBS;
  40 }
  41
  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
  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
  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
  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
 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
 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
 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);