alistair23-linux/drivers/mmc/core/mmc_ops.c

/*
 *  linux/drivers/mmc/mmc_ops.h
 *
 *  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/types.h>
#include <asm/scatterlist.h>
#include <linux/scatterlist.h>

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

#include "core.h"
#include "mmc_ops.h"

static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
{
	int err;
	struct mmc_command cmd;

	BUG_ON(!host);

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

	cmd.opcode = MMC_SELECT_CARD;

	if (card) {
		cmd.arg = card->rca << 16;
		cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
	} else {
		cmd.arg = 0;
		cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
	}

	err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
	if (err != MMC_ERR_NONE)
		return err;

	return MMC_ERR_NONE;
}

int mmc_select_card(struct mmc_card *card)
{
	BUG_ON(!card);

	return _mmc_select_card(card->host, card);
}

int mmc_deselect_cards(struct mmc_host *host)
{
	return _mmc_select_card(host, NULL);
}

int mmc_go_idle(struct mmc_host *host)
{
	int err;
	struct mmc_command cmd;

	mmc_set_chip_select(host, MMC_CS_HIGH);

	mmc_delay(1);

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

	cmd.opcode = MMC_GO_IDLE_STATE;
	cmd.arg = 0;
	cmd.flags = MMC_RSP_NONE | MMC_CMD_BC;

	err = mmc_wait_for_cmd(host, &cmd, 0);

	mmc_delay(1);

	mmc_set_chip_select(host, MMC_CS_DONTCARE);

	mmc_delay(1);

	return err;
}

int mmc_send_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 = MMC_SEND_OP_COND;
	cmd.arg = ocr;
	cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;

	for (i = 100; i; i--) {
		err = mmc_wait_for_cmd(host, &cmd, 0);
		if (err != MMC_ERR_NONE)
			break;

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

		err = MMC_ERR_TIMEOUT;

		mmc_delay(10);
	}

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

	return err;
}

int mmc_all_send_cid(struct mmc_host *host, u32 *cid)
{
	int err;
	struct mmc_command cmd;

	BUG_ON(!host);
	BUG_ON(!cid);

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

	cmd.opcode = MMC_ALL_SEND_CID;
	cmd.arg = 0;
	cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;

	err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
	if (err != MMC_ERR_NONE)
		return err;

	memcpy(cid, cmd.resp, sizeof(u32) * 4);

	return MMC_ERR_NONE;
}

int mmc_set_relative_addr(struct mmc_card *card)
{
	int err;
	struct mmc_command cmd;

	BUG_ON(!card);
	BUG_ON(!card->host);

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

	cmd.opcode = MMC_SET_RELATIVE_ADDR;
	cmd.arg = card->rca << 16;
	cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;

	err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
	if (err != MMC_ERR_NONE)
		return err;

	return MMC_ERR_NONE;
}

int mmc_send_csd(struct mmc_card *card, u32 *csd)
{
	int err;
	struct mmc_command cmd;

	BUG_ON(!card);
	BUG_ON(!card->host);
	BUG_ON(!csd);

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

	cmd.opcode = MMC_SEND_CSD;
	cmd.arg = card->rca << 16;
	cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;

	err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
	if (err != MMC_ERR_NONE)
		return err;

	memcpy(csd, cmd.resp, sizeof(u32) * 4);

	return MMC_ERR_NONE;
}

int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd)
{
	struct mmc_request mrq;
	struct mmc_command cmd;
	struct mmc_data data;
	struct scatterlist sg;

	BUG_ON(!card);
	BUG_ON(!card->host);
	BUG_ON(!ext_csd);

	memset(&mrq, 0, sizeof(struct mmc_request));
	memset(&cmd, 0, sizeof(struct mmc_command));
	memset(&data, 0, sizeof(struct mmc_data));

	mrq.cmd = &cmd;
	mrq.data = &data;

	cmd.opcode = MMC_SEND_EXT_CSD;
	cmd.arg = 0;
	cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;

	data.blksz = 512;
	data.blocks = 1;
	data.flags = MMC_DATA_READ;
	data.sg = &sg;
	data.sg_len = 1;

	sg_init_one(&sg, ext_csd, 512);

	mmc_set_data_timeout(&data, card, 0);

	mmc_wait_for_req(card->host, &mrq);

	if (cmd.error != MMC_ERR_NONE)
		return cmd.error;
	if (data.error != MMC_ERR_NONE)
		return data.error;

	return MMC_ERR_NONE;
}

int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value)
{
	int err;
	struct mmc_command cmd;

	BUG_ON(!card);
	BUG_ON(!card->host);

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

	cmd.opcode = MMC_SWITCH;
	cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
		  (index << 16) |
		  (value << 8) |
		  set;
	cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;

	err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
	if (err != MMC_ERR_NONE)
		return err;

	return MMC_ERR_NONE;
}

int mmc_send_status(struct mmc_card *card, u32 *status)
{
	int err;
	struct mmc_command cmd;

	BUG_ON(!card);
	BUG_ON(!card->host);

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

	cmd.opcode = MMC_SEND_STATUS;
	cmd.arg = card->rca << 16;
	cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;

	err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
	if (err != MMC_ERR_NONE)
		return err;

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

	return MMC_ERR_NONE;
}