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cplbinfo.c

/*
 * arch/blackfin/kernel/cplbinfo.c - display CPLB status
 *
 * Copyright 2004-2008 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#include <linux/ctype.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>

#include <asm/cplbinit.h>
#include <asm/blackfin.h>

static char const page_strtbl[][3] = { "1K", "4K", "1M", "4M" };
#define page(flags)    (((flags) & 0x30000) >> 16)
#define strpage(flags) page_strtbl[page(flags)]

00024 struct cplbinfo_data {
      loff_t pos;
      char cplb_type;
      u32 mem_control;
      struct cplb_entry *tbl;
      int switched;
};

static void cplbinfo_print_header(struct seq_file *m)
{
      seq_printf(m, "Index\tAddress\t\tData\tSize\tU/RD\tU/WR\tS/WR\tSwitch\n");
}

static int cplbinfo_nomore(struct cplbinfo_data *cdata)
{
      return cdata->pos >= MAX_CPLBS;
}

static int cplbinfo_show(struct seq_file *m, void *p)
{
      struct cplbinfo_data *cdata;
      unsigned long data, addr;
      loff_t pos;

      cdata = p;
      pos = cdata->pos;
      addr = cdata->tbl[pos].addr;
      data = cdata->tbl[pos].data;

      seq_printf(m,
            "%d\t0x%08lx\t%05lx\t%s\t%c\t%c\t%c\t%c\n",
            (int)pos, addr, data, strpage(data),
            (data & CPLB_USER_RD) ? 'Y' : 'N',
            (data & CPLB_USER_WR) ? 'Y' : 'N',
            (data & CPLB_SUPV_WR) ? 'Y' : 'N',
            pos < cdata->switched ? 'N' : 'Y');

      return 0;
}

static void cplbinfo_seq_init(struct cplbinfo_data *cdata, unsigned int cpu)
{
      if (cdata->cplb_type == 'I') {
            cdata->mem_control = bfin_read_IMEM_CONTROL();
            cdata->tbl = icplb_tbl[cpu];
            cdata->switched = first_switched_icplb;
      } else {
            cdata->mem_control = bfin_read_DMEM_CONTROL();
            cdata->tbl = dcplb_tbl[cpu];
            cdata->switched = first_switched_dcplb;
      }
}

static void *cplbinfo_start(struct seq_file *m, loff_t *pos)
{
      struct cplbinfo_data *cdata = m->private;

      if (!*pos) {
            seq_printf(m, "%cCPLBs are %sabled: 0x%x\n", cdata->cplb_type,
                  (cdata->mem_control & ENDCPLB ? "en" : "dis"),
                  cdata->mem_control);
            cplbinfo_print_header(m);
      } else if (cplbinfo_nomore(cdata))
            return NULL;

      get_cpu();
      return cdata;
}

static void *cplbinfo_next(struct seq_file *m, void *p, loff_t *pos)
{
      struct cplbinfo_data *cdata = p;
      cdata->pos = ++(*pos);
      if (cplbinfo_nomore(cdata))
            return NULL;
      else
            return cdata;
}

static void cplbinfo_stop(struct seq_file *m, void *p)
{
      put_cpu();
}

static const struct seq_operations cplbinfo_sops = {
      .start = cplbinfo_start,
      .next  = cplbinfo_next,
      .stop  = cplbinfo_stop,
      .show  = cplbinfo_show,
};

#define CPLBINFO_DCPLB_FLAG 0x80000000

static int cplbinfo_open(struct inode *inode, struct file *file)
{
      struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
      char cplb_type;
      unsigned int cpu;
      int ret;
      struct seq_file *m;
      struct cplbinfo_data *cdata;

      cpu = (unsigned int)pde->data;
      cplb_type = cpu & CPLBINFO_DCPLB_FLAG ? 'D' : 'I';
      cpu &= ~CPLBINFO_DCPLB_FLAG;

      if (!cpu_online(cpu))
            return -ENODEV;

      ret = seq_open_private(file, &cplbinfo_sops, sizeof(*cdata));
      if (ret)
            return ret;
      m = file->private_data;
      cdata = m->private;

      cdata->pos = 0;
      cdata->cplb_type = cplb_type;
      cplbinfo_seq_init(cdata, cpu);

      return 0;
}

static const struct file_operations cplbinfo_fops = {
      .open    = cplbinfo_open,
      .read    = seq_read,
      .llseek  = seq_lseek,
      .release = seq_release_private,
};

static int __init cplbinfo_init(void)
{
      struct proc_dir_entry *cplb_dir, *cpu_dir;
      char buf[10];
      unsigned int cpu;

      cplb_dir = proc_mkdir("cplbinfo", NULL);
      if (!cplb_dir)
            return -ENOMEM;

      for_each_possible_cpu(cpu) {
            sprintf(buf, "cpu%i", cpu);
            cpu_dir = proc_mkdir(buf, cplb_dir);
            if (!cpu_dir)
                  return -ENOMEM;

            proc_create_data("icplb", S_IRUGO, cpu_dir, &cplbinfo_fops,
                  (void *)cpu);
            proc_create_data("dcplb", S_IRUGO, cpu_dir, &cplbinfo_fops,
                  (void *)(cpu | CPLBINFO_DCPLB_FLAG));
      }

      return 0;
}
late_initcall(cplbinfo_init);

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