debug.c

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/*
 *  cb710/debug.c
 *
 *  Copyright by Michał Mirosław, 2008-2009
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/cb710.h>
#include <linux/kernel.h>
#include <linux/module.h>

#define CB710_REG_COUNT     0x80

static const u16 allow[CB710_REG_COUNT/16] = {
    0xFFF0, 0xFFFF, 0xFFFF, 0xFFFF,
    0xFFF0, 0xFFFF, 0xFFFF, 0xFFFF,
};
static const char *const prefix[ARRAY_SIZE(allow)] = {
    "MMC", "MMC", "MMC", "MMC",
    "MS?", "MS?", "SM?", "SM?"
};

static inline int allow_reg_read(unsigned block, unsigned offset, unsigned bits)
{
    unsigned mask = (1 << bits/8) - 1;
    offset *= bits/8;
    return ((allow[block] >> offset) & mask) == mask;
}

#define CB710_READ_REGS_TEMPLATE(t)                 \
static void cb710_read_regs_##t(void __iomem *iobase,           \
    u##t *reg, unsigned select)                 \
{                                   \
    unsigned i, j;                          \
                                    \
    for (i = 0; i < ARRAY_SIZE(allow); ++i, reg += 16/(t/8)) {  \
        if (!(select & (1 << i)))                   \
            continue;                   \
                                    \
        for (j = 0; j < 0x10/(t/8); ++j) {          \
            if (!allow_reg_read(i, j, t))           \
                continue;               \
            reg[j] = ioread##t(iobase           \
                + (i << 4) + (j * (t/8)));      \
        }                           \
    }                               \
}

static const char cb710_regf_8[] = "%02X";
static const char cb710_regf_16[] = "%04X";
static const char cb710_regf_32[] = "%08X";
static const char cb710_xes[] = "xxxxxxxx";

#define CB710_DUMP_REGS_TEMPLATE(t)                 \
static void cb710_dump_regs_##t(struct device *dev,         \
    const u##t *reg, unsigned select)               \
{                                   \
    const char *const xp = &cb710_xes[8 - t/4];         \
    const char *const format = cb710_regf_##t;          \
                                    \
    char msg[100], *p;                      \
    unsigned i, j;                          \
                                    \
    for (i = 0; i < ARRAY_SIZE(allow); ++i, reg += 16/(t/8)) {  \
        if (!(select & (1 << i)))               \
            continue;                   \
        p = msg;                        \
        for (j = 0; j < 0x10/(t/8); ++j) {          \
            *p++ = ' ';                 \
            if (j == 8/(t/8))               \
                *p++ = ' ';             \
            if (allow_reg_read(i, j, t))            \
                p += sprintf(p, format, reg[j]);    \
            else                        \
                p += sprintf(p, "%s", xp);      \
        }                           \
        dev_dbg(dev, "%s 0x%02X %s\n", prefix[i], i << 4, msg); \
    }                               \
}

#define CB710_READ_AND_DUMP_REGS_TEMPLATE(t)                \
static void cb710_read_and_dump_regs_##t(struct cb710_chip *chip,   \
    unsigned select)                        \
{                                   \
    u##t regs[CB710_REG_COUNT/sizeof(u##t)];            \
                                    \
    memset(&regs, 0, sizeof(regs));                 \
    cb710_read_regs_##t(chip->iobase, regs, select);        \
    cb710_dump_regs_##t(cb710_chip_dev(chip), regs, select);    \
}

#define CB710_REG_ACCESS_TEMPLATES(t)       \
  CB710_READ_REGS_TEMPLATE(t)           \
  CB710_DUMP_REGS_TEMPLATE(t)           \
  CB710_READ_AND_DUMP_REGS_TEMPLATE(t)

CB710_REG_ACCESS_TEMPLATES(8)
CB710_REG_ACCESS_TEMPLATES(16)
CB710_REG_ACCESS_TEMPLATES(32)

void cb710_dump_regs(struct cb710_chip *chip, unsigned select)
{
    if (!(select & CB710_DUMP_REGS_MASK))
        select = CB710_DUMP_REGS_ALL;
    if (!(select & CB710_DUMP_ACCESS_MASK))
        select |= CB710_DUMP_ACCESS_8;

    if (select & CB710_DUMP_ACCESS_32)
        cb710_read_and_dump_regs_32(chip, select);
    if (select & CB710_DUMP_ACCESS_16)
        cb710_read_and_dump_regs_16(chip, select);
    if (select & CB710_DUMP_ACCESS_8)
        cb710_read_and_dump_regs_8(chip, select);
}
EXPORT_SYMBOL_GPL(cb710_dump_regs);