Release 4.11 drivers/mmc/core/mmc_ops.c

/*
 *  linux/drivers/mmc/core/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/slab.h>
#include <linux/export.h>
#include <linux/types.h>
#include <linux/scatterlist.h>

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

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


#define MMC_OPS_TIMEOUT_MS	(10 * 60 * 1000) 
/* 10 minute timeout */


static const u8 tuning_blk_pattern_4bit[] = {
	0xff, 0x0f, 0xff, 0x00, 0xff, 0xcc, 0xc3, 0xcc,
	0xc3, 0x3c, 0xcc, 0xff, 0xfe, 0xff, 0xfe, 0xef,
	0xff, 0xdf, 0xff, 0xdd, 0xff, 0xfb, 0xff, 0xfb,
	0xbf, 0xff, 0x7f, 0xff, 0x77, 0xf7, 0xbd, 0xef,
	0xff, 0xf0, 0xff, 0xf0, 0x0f, 0xfc, 0xcc, 0x3c,
	0xcc, 0x33, 0xcc, 0xcf, 0xff, 0xef, 0xff, 0xee,
	0xff, 0xfd, 0xff, 0xfd, 0xdf, 0xff, 0xbf, 0xff,
	0xbb, 0xff, 0xf7, 0xff, 0xf7, 0x7f, 0x7b, 0xde,
};


static const u8 tuning_blk_pattern_8bit[] = {
	0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00,
	0xff, 0xff, 0xcc, 0xcc, 0xcc, 0x33, 0xcc, 0xcc,
	0xcc, 0x33, 0x33, 0xcc, 0xcc, 0xcc, 0xff, 0xff,
	0xff, 0xee, 0xff, 0xff, 0xff, 0xee, 0xee, 0xff,
	0xff, 0xff, 0xdd, 0xff, 0xff, 0xff, 0xdd, 0xdd,
	0xff, 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff, 0xbb,
	0xbb, 0xff, 0xff, 0xff, 0x77, 0xff, 0xff, 0xff,
	0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee, 0xff,
	0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00,
	0x00, 0xff, 0xff, 0xcc, 0xcc, 0xcc, 0x33, 0xcc,
	0xcc, 0xcc, 0x33, 0x33, 0xcc, 0xcc, 0xcc, 0xff,
	0xff, 0xff, 0xee, 0xff, 0xff, 0xff, 0xee, 0xee,
	0xff, 0xff, 0xff, 0xdd, 0xff, 0xff, 0xff, 0xdd,
	0xdd, 0xff, 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff,
	0xbb, 0xbb, 0xff, 0xff, 0xff, 0x77, 0xff, 0xff,
	0xff, 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee,
};



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

	cmd.opcode = MMC_SEND_STATUS;
	if (!mmc_host_is_spi(card->host))
		cmd.arg = card->rca << 16;
	cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;

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

	/* NOTE: callers are required to understand the difference
         * between "native" and SPI format status words!
         */
	if (status)
		*status = cmd.resp[0];

	return 0;
}

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

	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;
	}

	return mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
}

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1
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int mmc_select_card(struct mmc_card *card)
{

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

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

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/*
 * Write the value specified in the device tree or board code into the optional
 * 16 bit Driver Stage Register. This can be used to tune raise/fall times and
 * drive strength of the DAT and CMD outputs. The actual meaning of a given
 * value is hardware dependant.
 * The presence of the DSR register can be determined from the CSD register,
 * bit 76.
 */


int mmc_set_dsr(struct mmc_host *host)
{
	struct mmc_command cmd = {};

	cmd.opcode = MMC_SET_DSR;

	cmd.arg = (host->dsr << 16) | 0xffff;
	cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;

	return mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
}

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55
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int mmc_go_idle(struct mmc_host *host)
{
	int err;
	struct mmc_command cmd = {};

	/*
         * Non-SPI hosts need to prevent chipselect going active during
         * GO_IDLE; that would put chips into SPI mode.  Remind them of
         * that in case of hardware that won't pull up DAT3/nCS otherwise.
         *
         * SPI hosts ignore ios.chip_select; it's managed according to
         * rules that must accommodate non-MMC slaves which this layer
         * won't even know about.
         */
	if (!mmc_host_is_spi(host)) {
		mmc_set_chip_select(host, MMC_CS_HIGH);
		mmc_delay(1);
	}

	cmd.opcode = MMC_GO_IDLE_STATE;
	cmd.arg = 0;
	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC;

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

	mmc_delay(1);

	if (!mmc_host_is_spi(host)) {
		mmc_set_chip_select(host, MMC_CS_DONTCARE);
		mmc_delay(1);
	}

	host->use_spi_crc = 0;

	return err;
}

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Chris Ball
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Lucas De Marchi
1
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int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
{
	struct mmc_command cmd = {};
	int i, err = 0;

	cmd.opcode = MMC_SEND_OP_COND;
	cmd.arg = mmc_host_is_spi(host) ? 0 : ocr;
	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;

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

		/* if we're just probing, do a single pass */
		if (ocr == 0)
			break;

		/* otherwise wait until reset completes */
		if (mmc_host_is_spi(host)) {
			if (!(cmd.resp[0] & R1_SPI_IDLE))
				break;
		} else {
			if (cmd.resp[0] & MMC_CARD_BUSY)
				break;
		}

		err = -ETIMEDOUT;

		mmc_delay(10);
	}

	if (rocr && !mmc_host_is_spi(host))
		*rocr = cmd.resp[0];

	return err;
}

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Masahiro Yamada
1
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Chris Ball
1
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170
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int mmc_all_send_cid(struct mmc_host *host, u32 *cid)
{
	int err;
	struct mmc_command cmd = {};

	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)
		return err;

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

	return 0;
}

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

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

	return mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
}

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static int

mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
{
	int err;
	struct mmc_command cmd = {};

	cmd.opcode = opcode;
	cmd.arg = arg;
	cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;

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

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

	return 0;
}

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/*
 * NOTE: void *buf, caller for the buf is required to use DMA-capable
 * buffer or on-stack buffer (with some overhead in callee).
 */

static int

mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
		u32 opcode, void *buf, unsigned len)
{
	struct mmc_request mrq = {};
	struct mmc_command cmd = {};
	struct mmc_data data = {};
	struct scatterlist sg;

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

	cmd.opcode = opcode;
	cmd.arg = 0;

	/* NOTE HACK:  the MMC_RSP_SPI_R1 is always correct here, but we
         * rely on callers to never use this with "native" calls for reading
         * CSD or CID.  Native versions of those commands use the R2 type,
         * not R1 plus a data block.
         */
	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;

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

	sg_init_one(&sg, buf, len);

	if (opcode == MMC_SEND_CSD || opcode == MMC_SEND_CID) {
		/*
                 * The spec states that CSR and CID accesses have a timeout
                 * of 64 clock cycles.
                 */
		data.timeout_ns = 0;
		data.timeout_clks = 64;
	} else
		mmc_set_data_timeout(&data, card);

	mmc_wait_for_req(host, &mrq);

	if (cmd.error)
		return cmd.error;
	if (data.error)
		return data.error;

	return 0;
}

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22
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David Brownell
21
10.88%
1
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Matthew Fleming
10
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1
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Masahiro Yamada
3
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1
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Chris Ball
3
1.55%
3
27.27%
Kyungsik Lee
2
1.04%
1
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Ulf Hansson
1
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int mmc_send_csd(struct mmc_card *card, u32 *csd)
{
	int ret, i;
	u32 *csd_tmp;

	if (!mmc_host_is_spi(card->host))
		return mmc_send_cxd_native(card->host, card->rca << 16,
				csd, MMC_SEND_CSD);

	csd_tmp = kzalloc(16, GFP_KERNEL);
	if (!csd_tmp)
		return -ENOMEM;

	ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd_tmp, 16);
	if (ret)
		goto err;

	for (i = 0;i < 4;i++)
		csd[i] = be32_to_cpu(csd_tmp[i]);

err:
	kfree(csd_tmp);
	return ret;
}

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int mmc_send_cid(struct mmc_host *host, u32 *cid)
{
	int ret, i;
	u32 *cid_tmp;

	if (!mmc_host_is_spi(host)) {
		if (!host->card)
			return -EINVAL;
		return mmc_send_cxd_native(host, host->card->rca << 16,
				cid, MMC_SEND_CID);
	}

	cid_tmp = kzalloc(16, GFP_KERNEL);
	if (!cid_tmp)
		return -ENOMEM;

	ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid_tmp, 16);
	if (ret)
		goto err;

	for (i = 0;i < 4;i++)
		cid[i] = be32_to_cpu(cid_tmp[i]);

err:
	kfree(cid_tmp);
	return ret;
}

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int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
{
	int err;
	u8 *ext_csd;

	if (!card || !new_ext_csd)
		return -EINVAL;

	if (!mmc_can_ext_csd(card))
		return -EOPNOTSUPP;

	/*
         * As the ext_csd is so large and mostly unused, we don't store the
         * raw block in mmc_card.
         */
	ext_csd = kzalloc(512, GFP_KERNEL);
	if (!ext_csd)
		return -ENOMEM;

	err = mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD, ext_csd,
				512);
	if (err)
		kfree(ext_csd);
	else
		*new_ext_csd = ext_csd;

	return err;
}
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EXPORT_SYMBOL_GPL(mmc_get_ext_csd);



int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
{
	struct mmc_command cmd = {};
	int err;

	cmd.opcode = MMC_SPI_READ_OCR;
	cmd.arg = highcap ? (1 << 30) : 0;
	cmd.flags = MMC_RSP_SPI_R3;

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

	*ocrp = cmd.resp[1];
	return err;
}

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int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
{
	struct mmc_command cmd = {};
	int err;

	cmd.opcode = MMC_SPI_CRC_ON_OFF;
	cmd.flags = MMC_RSP_SPI_R1;
	cmd.arg = use_crc;

	err = mmc_wait_for_cmd(host, &cmd, 0);
	if (!err)
		host->use_spi_crc = use_crc;
	return err;
}

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static int mmc_switch_status_error(struct mmc_host *host, u32 status)
{
	if (mmc_host_is_spi(host)) {
		if (status & R1_SPI_ILLEGAL_COMMAND)
			return -EBADMSG;
	} else {
		if (status & 0xFDFFA000)
			pr_warn("%s: unexpected status %#x after switch\n",
				mmc_hostname(host), status);
		if (status & R1_SWITCH_ERROR)
			return -EBADMSG;
	}
	return 0;
}

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/* Caller must hold re-tuning */


int __mmc_switch_status(struct mmc_card *card, bool crc_err_fatal)
{
	u32 status;
	int err;

	err = mmc_send_status(card, &status);
	if (!crc_err_fatal && err == -EILSEQ)
		return 0;
	if (err)
		return err;

	return mmc_switch_status_error(card->host, status);
}

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int mmc_switch_status(struct mmc_card *card)
{
	return __mmc_switch_status(card, true);
}

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static int mmc_poll_for_busy(struct mmc_card *card, unsigned int timeout_ms,
			bool send_status, bool retry_crc_err)
{
	struct mmc_host *host = card->host;
	int err;
	unsigned long timeout;
	u32 status = 0;
	bool expired = false;
	bool busy = false;

	/* We have an unspecified cmd timeout, use the fallback value. */
	if (!timeout_ms)
		timeout_ms = MMC_OPS_TIMEOUT_MS;

	/*
         * In cases when not allowed to poll by using CMD13 or because we aren't
         * capable of polling by using ->card_busy(), then rely on waiting the
         * stated timeout to be sufficient.
         */
	if (!send_status && !host->ops->card_busy) {
		mmc_delay(timeout_ms);
		return 0;
	}

	timeout = jiffies + msecs_to_jiffies(timeout_ms) + 1;
	do {
		/*
                 * Due to the possibility of being preempted while polling,
                 * check the expiration time first.
                 */
		expired = time_after(jiffies, timeout);

		if (host->ops->card_busy) {
			busy = host->ops->card_busy(host);
		} else {
			err = mmc_send_status(card, &status);
			if (retry_crc_err && err == -EILSEQ) {
				busy = true;
			} else if (err) {
				return err;
			} else {
				err = mmc_switch_status_error(host, status);
				if (err)
					return err;
				busy = R1_CURRENT_STATE(status) == R1_STATE_PRG;
			}
		}

		/* Timeout if the device still remains busy. */
		if (expired && busy) {
			pr_err("%s: Card stuck being busy! %s\n",
				mmc_hostname(host), __func__);
			return -ETIMEDOUT;
		}
	} while (busy);

	return 0;
}

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/**
 *      __mmc_switch - modify EXT_CSD register
 *      @card: the MMC card associated with the data transfer
 *      @set: cmd set values
 *      @index: EXT_CSD register index
 *      @value: value to program into EXT_CSD register
 *      @timeout_ms: timeout (ms) for operation performed by register write,
 *                   timeout of zero implies maximum possible timeout
 *      @timing: new timing to change to
 *      @use_busy_signal: use the busy signal as response type
 *      @send_status: send status cmd to poll for busy
 *      @retry_crc_err: retry when CRC errors when polling with CMD13 for busy
 *
 *      Modifies the EXT_CSD register for selected card.
 */


int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
		unsigned int timeout_ms, unsigned char timing,
		bool use_busy_signal, bool send_status,	bool retry_crc_err)
{
	struct mmc_host *host = card->host;
	int err;
	struct mmc_command cmd = {};
	bool use_r1b_resp = use_busy_signal;
	unsigned char old_timing = host->ios.timing;

	mmc_retune_hold(host);

	/*
         * If the cmd timeout and the max_busy_timeout of the host are both
         * specified, let's validate them. A failure means we need to prevent
         * the host from doing hw busy detection, which is done by converting
         * to a R1 response instead of a R1B.
         */
	if (timeout_ms && host->max_busy_timeout &&
		(timeout_ms > host->max_busy_timeout))
		use_r1b_resp = false;

	cmd.opcode = MMC_SWITCH;
	cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
		  (index << 16) |
		  (value << 8) |
		  set;
	cmd.flags = MMC_CMD_AC;
	if (use_r1b_resp) {
		cmd.flags |= MMC_RSP_SPI_R1B | MMC_RSP_R1B;
		/*
                 * A busy_timeout of zero means the host can decide to use
                 * whatever value it finds suitable.
                 */
		cmd.busy_timeout = timeout_ms;
	} else {
		cmd.flags |= MMC_RSP_SPI_R1 | MMC_RSP_R1;
	}

	if (index == EXT_CSD_SANITIZE_START)
		cmd.sanitize_busy = true;

	err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
	if (err)
		goto out;

	/* No need to check card status in case of unblocking command */
	if (!use_busy_signal)
		goto out;

	/*If SPI or used HW busy detection above, then we don't need to poll. */
	if (((host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp) ||
		mmc_host_is_spi(host))
		goto out_tim;

	/* Let's try to poll to find out when the command is completed. */
	err = mmc_poll_for_busy(card, timeout_ms, send_status, retry_crc_err);
	if (err)
		goto out;

out_tim:
	/* Switch to new timing before check switch status. */
	if (timing)
		mmc_set_timing(host, timing);

	if (send_status) {
		err = mmc_switch_status(card);
		if (err && timing)
			mmc_set_timing(host, old_timing);
	}
out:
	mmc_retune_release(host);

	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ulf Hansson
134
45.12%
9
45.00%
Pierre Ossman
80
26.94%
1
5.00%
Jaehoon Chung
27
9.09%
1
5.00%
Adrian Hunter
27
9.09%
2
10.00%
Maya Erez
12
4.04%
1
5.00%
Seungwon Jeon
8
2.69%
1
5.00%
Andrei Warkentin
4
1.35%
1
5.00%
David Brownell
2
0.67%
1
5.00%
Chris Ball
1
0.34%
1
5.00%
Masahiro Yamada
1
0.34%
1
5.00%
Trey Ramsay
1
0.34%
1
5.00%
Total
297
100.00%
20
100.00%



int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
		unsigned int timeout_ms)
{
	return __mmc_switch(card, set, index, value, timeout_ms, 0,
			true, true, false);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jaehoon Chung
39
86.67%
1
25.00%
Ulf Hansson
6
13.33%
3
75.00%
Total
45
100.00%
4
100.00%


EXPORT_SYMBOL_GPL(mmc_switch);



int mmc_send_tuning(struct mmc_host *host, u32 opcode, int *cmd_error)
{
	struct mmc_request mrq = {};
	struct mmc_command cmd = {};
	struct mmc_data data = {};
	struct scatterlist sg;
	struct mmc_ios *ios = &host->ios;
	const u8 *tuning_block_pattern;
	int size, err = 0;
	u8 *data_buf;

	if (ios->bus_width == MMC_BUS_WIDTH_8) {
		tuning_block_pattern = tuning_blk_pattern_8bit;
		size = sizeof(tuning_blk_pattern_8bit);
	} else if (ios->bus_width == MMC_BUS_WIDTH_4) {
		tuning_block_pattern = tuning_blk_pattern_4bit;
		size = sizeof(tuning_blk_pattern_4bit);
	} else
		return -EINVAL;

	data_buf = kzalloc(size, GFP_KERNEL);
	if (!data_buf)
		return -ENOMEM;

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

	cmd.opcode = opcode;
	cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;

	data.blksz = size;
	data.blocks = 1;
	data.flags = MMC_DATA_READ;

	/*
         * According to the tuning specs, Tuning process
         * is normally shorter 40 executions of CMD19,
         * and timeout value should be shorter than 150 ms
         */
	data.timeout_ns = 150 * NSEC_PER_MSEC;

	data.sg = &sg;
	data.sg_len = 1;
	sg_init_one(&sg, data_buf, size);

	mmc_wait_for_req(host, &mrq);

	if (cmd_error)
		*cmd_error = cmd.error;

	if (cmd.error) {
		err = cmd.error;
		goto out;
	}

	if (data.error) {
		err = data.error;
		goto out;
	}

	if (memcmp(data_buf, tuning_block_pattern, size))
		err = -EIO;

out:
	kfree(data_buf);
	return err;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Minda Chen
263
91.32%
1
25.00%
Chaotian Jing
18
6.25%
1
25.00%
Ulf Hansson
4
1.39%
1
25.00%
Masahiro Yamada
3
1.04%
1
25.00%
Total
288
100.00%
4
100.00%


EXPORT_SYMBOL_GPL(mmc_send_tuning);



int mmc_abort_tuning(struct mmc_host *host, u32 opcode)
{
	struct mmc_command cmd = {};

	/*
         * eMMC specification specifies that CMD12 can be used to stop a tuning
         * command, but SD specification does not, so do nothing unless it is
         * eMMC.
         */
	if (opcode != MMC_SEND_TUNING_BLOCK_HS200)
		return 0;

	cmd.opcode = MMC_STOP_TRANSMISSION;
	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;

	/*
         * For drivers that override R1 to R1b, set an arbitrary timeout based
         * on the tuning timeout i.e. 150ms.
         */
	cmd.busy_timeout = 150;

	return mmc_wait_for_cmd(host, &cmd, 0);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Adrian Hunter
62
98.41%
1
50.00%
Masahiro Yamada
1
1.59%
1
50.00%
Total
63
100.00%
2
100.00%


EXPORT_SYMBOL_GPL(mmc_abort_tuning);


static int

mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode,
		  u8 len)
{
	struct mmc_request mrq = {};
	struct mmc_command cmd = {};
	struct mmc_data data = {};
	struct scatterlist sg;
	u8 *data_buf;
	u8 *test_buf;
	int i, err;
	static u8 testdata_8bit[8] = { 0x55, 0xaa, 0, 0, 0, 0, 0, 0 };
	static u8 testdata_4bit[4] = { 0x5a, 0, 0, 0 };

	/* dma onto stack is unsafe/nonportable, but callers to this
         * routine normally provide temporary on-stack buffers ...
         */
	data_buf = kmalloc(len, GFP_KERNEL);
	if (!data_buf)
		return -ENOMEM;

	if (len == 8)
		test_buf = testdata_8bit;
	else if (len == 4)
		test_buf = testdata_4bit;
	else {
		pr_err("%s: Invalid bus_width %d\n",
		       mmc_hostname(host), len);
		kfree(data_buf);
		return -EINVAL;
	}

	if (opcode == MMC_BUS_TEST_W)
		memcpy(data_buf, test_buf, len);

	mrq.cmd = &cmd;
	mrq.data = &data;
	cmd.opcode = opcode;
	cmd.arg = 0;

	/* NOTE HACK:  the MMC_RSP_SPI_R1 is always correct here, but we
         * rely on callers to never use this with "native" calls for reading
         * CSD or CID.  Native versions of those commands use the R2 type,
         * not R1 plus a data block.
         */
	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;

	data.blksz = len;
	data.blocks = 1;
	if (opcode == MMC_BUS_TEST_R)
		data.flags = MMC_DATA_READ;
	else
		data.flags = MMC_DATA_WRITE;

	data.sg = &sg;
	data.sg_len = 1;
	mmc_set_data_timeout(&data, card);
	sg_init_one(&sg, data_buf, len);
	mmc_wait_for_req(host, &mrq);
	err = 0;
	if (opcode == MMC_BUS_TEST_R) {
		for (i = 0; i < len / 4; i++)
			if ((test_buf[i] ^ data_buf[i]) != 0xff) {
				err = -EIO;
				break;
			}
	}
	kfree(data_buf);

	if (cmd.error)
		return cmd.error;
	if (data.error)
		return data.error;

	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Aries Lee
351
95.90%
1
14.29%
Minjian Wu
8
2.19%
1
14.29%
Chris Ball
3
0.82%
3
42.86%
Masahiro Yamada
3
0.82%
1
14.29%
Girish K.S
1
0.27%
1
14.29%
Total
366
100.00%
7
100.00%



int mmc_bus_test(struct mmc_card *card, u8 bus_width)
{
	int width;

	if (bus_width == MMC_BUS_WIDTH_8)
		width = 8;
	else if (bus_width == MMC_BUS_WIDTH_4)
		width = 4;
	else if (bus_width == MMC_BUS_WIDTH_1)
		return 0; /* no need for test */
	else
		return -EINVAL;

	/*
         * Ignore errors from BUS_TEST_W.  BUS_TEST_R will fail if there
         * is a problem.  This improves chances that the test will work.
         */
	mmc_send_bus_test(card, card->host, MMC_BUS_TEST_W, width);
	return mmc_send_bus_test(card, card->host, MMC_BUS_TEST_R, width);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Aries Lee
80
98.77%
1
50.00%
Masahiro Yamada
1
1.23%
1
50.00%
Total
81
100.00%
2
100.00%



int mmc_send_hpi_cmd(struct mmc_card *card, u32 *status)
{
	struct mmc_command cmd = {};
	unsigned int opcode;
	int err;

	if (!card->ext_csd.hpi) {
		pr_warn("%s: Card didn't support HPI command\n",
			mmc_hostname(card->host));
		return -EINVAL;
	}

	opcode = card->ext_csd.hpi_cmd;
	if (opcode == MMC_STOP_TRANSMISSION)
		cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
	else if (opcode == MMC_SEND_STATUS)
		cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;

	cmd.opcode = opcode;
	cmd.arg = card->rca << 16 | 1;

	err = mmc_wait_for_cmd(card->host, &cmd, 0);
	if (err) {
		pr_warn("%s: error %d interrupting operation. "
			"HPI command response %#x\n", mmc_hostname(card->host),
			err, cmd.resp[0]);
		return err;
	}
	if (status)
		*status = cmd.resp[0];

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jaehoon Chung
169
98.83%
2
50.00%
Joe Perches
1
0.58%
1
25.00%
Masahiro Yamada
1
0.58%
1
25.00%
Total
171
100.00%
4
100.00%



int mmc_can_ext_csd(struct mmc_card *card)
{
	return (card && card->csd.mmca_vsn > CSD_SPEC_VER_3);
}
Contributors
Person
Tokens
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CommitProp
Ulf Hansson
23
100.00%
1
100.00%
Total
23
100.00%
1
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Ulf Hansson
950
26.06%
21
37.50%
Pierre Ossman
823
22.58%
4
7.14%
Aries Lee
431
11.82%
1
1.79%
David Brownell
376
10.32%
1
1.79%
Minda Chen
268
7.35%
1
1.79%
Jaehoon Chung
235
6.45%
3
5.36%
Adrian Hunter
220
6.04%
6
10.71%
Seungwon Jeon
104
2.85%
1
1.79%
Kyungsik Lee
71
1.95%
1
1.79%
Sascha Hauer
55
1.51%
1
1.79%
Masahiro Yamada
25
0.69%
2
3.57%
Chaotian Jing
18
0.49%
1
1.79%
Chris Ball
15
0.41%
3
5.36%
Maya Erez
12
0.33%
1
1.79%
Matthew Fleming
10
0.27%
1
1.79%
Andrei Warkentin
9
0.25%
1
1.79%
Minjian Wu
8
0.22%
1
1.79%
Trey Ramsay
6
0.16%
1
1.79%
Tejun Heo
3
0.08%
1
1.79%
Paul Gortmaker
3
0.08%
1
1.79%
Girish K.S
1
0.03%
1
1.79%
Joe Perches
1
0.03%
1
1.79%
Lucas De Marchi
1
0.03%
1
1.79%
Total
3645
100.00%
56
100.00%
Directory: drivers/mmc/core

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