drivers/mmc/core/sdio_ops.c

/*
 *  linux/drivers/mmc/sdio_ops.c
 *
 *  Copyright 2006-2007 Pierre Ossman
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 */

#include <linux/mmc/host.h>
#include <linux/mmc/card.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/sdio.h>

#include "core.h"

int mmc_send_io_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
{
	struct mmc_command cmd;
	int i, err = 0;

	BUG_ON(!host);

	memset(&cmd, 0, sizeof(struct mmc_command));

	cmd.opcode = SD_IO_SEND_OP_COND;
	cmd.arg = ocr;
	cmd.flags = MMC_RSP_R4 | MMC_CMD_BCR;

	for (i = 100; i; i--) {
		err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
		if (err)
			break;

		if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
			break;

		err = -ETIMEDOUT;

		mmc_delay(10);
	}

	if (rocr)
		*rocr = cmd.resp[0];

	return err;
}

int mmc_io_rw_direct(struct mmc_card *card, int write, unsigned fn,
	unsigned addr, u8 in, u8* out)
{
	struct mmc_command cmd;
	int err;

	BUG_ON(!card);
	BUG_ON(fn > 7);

	memset(&cmd, 0, sizeof(struct mmc_command));

	cmd.opcode = SD_IO_RW_DIRECT;
	cmd.arg = write ? 0x80000000 : 0x00000000;
	cmd.arg |= fn << 28;
	cmd.arg |= (write && out) ? 0x08000000 : 0x00000000;
	cmd.arg |= addr << 9;
	cmd.arg |= in;
	cmd.flags = MMC_RSP_R5 | MMC_CMD_AC;

	err = mmc_wait_for_cmd(card->host, &cmd, 0);
	if (err)
		return err;

	if (cmd.resp[0] & R5_ERROR)
		return -EIO;
	if (cmd.resp[0] & R5_FUNCTION_NUMBER)
		return -EINVAL;
	if (cmd.resp[0] & R5_OUT_OF_RANGE)
		return -ERANGE;

	if (out)
		*out = cmd.resp[0] & 0xFF;

	return 0;
}