cplbinfo.c

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/*
 * 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)]

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);