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d3a8d95dcb
CMD6 is an R1B-type command, where DAT is used as busy. Depending on register written using CMD6, timeout value can be different as per spec. Signed-off-by: Andrei Warkentin <andreiw@motorola.com> Signed-off-by: Chris Ball <cjb@laptop.org>
580 lines
12 KiB
C
580 lines
12 KiB
C
/*
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* linux/drivers/mmc/core/mmc_ops.h
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*
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* Copyright 2006-2007 Pierre Ossman
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*/
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/scatterlist.h>
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#include <linux/mmc/host.h>
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#include <linux/mmc/card.h>
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#include <linux/mmc/mmc.h>
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#include "core.h"
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#include "mmc_ops.h"
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static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
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{
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int err;
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struct mmc_command cmd;
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BUG_ON(!host);
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memset(&cmd, 0, sizeof(struct mmc_command));
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cmd.opcode = MMC_SELECT_CARD;
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if (card) {
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cmd.arg = card->rca << 16;
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cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
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} else {
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cmd.arg = 0;
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cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
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}
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err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
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if (err)
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return err;
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return 0;
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}
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int mmc_select_card(struct mmc_card *card)
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{
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BUG_ON(!card);
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return _mmc_select_card(card->host, card);
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}
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int mmc_deselect_cards(struct mmc_host *host)
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{
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return _mmc_select_card(host, NULL);
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}
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int mmc_card_sleepawake(struct mmc_host *host, int sleep)
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{
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struct mmc_command cmd;
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struct mmc_card *card = host->card;
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int err;
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if (sleep)
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mmc_deselect_cards(host);
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memset(&cmd, 0, sizeof(struct mmc_command));
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cmd.opcode = MMC_SLEEP_AWAKE;
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cmd.arg = card->rca << 16;
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if (sleep)
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cmd.arg |= 1 << 15;
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cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
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err = mmc_wait_for_cmd(host, &cmd, 0);
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if (err)
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return err;
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/*
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* If the host does not wait while the card signals busy, then we will
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* will have to wait the sleep/awake timeout. Note, we cannot use the
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* SEND_STATUS command to poll the status because that command (and most
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* others) is invalid while the card sleeps.
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*/
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if (!(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
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mmc_delay(DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000));
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if (!sleep)
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err = mmc_select_card(card);
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return err;
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}
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int mmc_go_idle(struct mmc_host *host)
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{
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int err;
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struct mmc_command cmd;
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/*
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* Non-SPI hosts need to prevent chipselect going active during
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* GO_IDLE; that would put chips into SPI mode. Remind them of
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* that in case of hardware that won't pull up DAT3/nCS otherwise.
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*
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* SPI hosts ignore ios.chip_select; it's managed according to
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* rules that must accommodate non-MMC slaves which this layer
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* won't even know about.
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*/
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if (!mmc_host_is_spi(host)) {
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mmc_set_chip_select(host, MMC_CS_HIGH);
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mmc_delay(1);
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}
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memset(&cmd, 0, sizeof(struct mmc_command));
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cmd.opcode = MMC_GO_IDLE_STATE;
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cmd.arg = 0;
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cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC;
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err = mmc_wait_for_cmd(host, &cmd, 0);
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mmc_delay(1);
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if (!mmc_host_is_spi(host)) {
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mmc_set_chip_select(host, MMC_CS_DONTCARE);
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mmc_delay(1);
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}
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host->use_spi_crc = 0;
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return err;
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}
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int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
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{
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struct mmc_command cmd;
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int i, err = 0;
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BUG_ON(!host);
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memset(&cmd, 0, sizeof(struct mmc_command));
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cmd.opcode = MMC_SEND_OP_COND;
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cmd.arg = mmc_host_is_spi(host) ? 0 : ocr;
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cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
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for (i = 100; i; i--) {
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err = mmc_wait_for_cmd(host, &cmd, 0);
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if (err)
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break;
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/* if we're just probing, do a single pass */
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if (ocr == 0)
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break;
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/* otherwise wait until reset completes */
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if (mmc_host_is_spi(host)) {
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if (!(cmd.resp[0] & R1_SPI_IDLE))
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break;
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} else {
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if (cmd.resp[0] & MMC_CARD_BUSY)
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break;
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}
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err = -ETIMEDOUT;
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mmc_delay(10);
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}
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if (rocr && !mmc_host_is_spi(host))
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*rocr = cmd.resp[0];
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return err;
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}
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int mmc_all_send_cid(struct mmc_host *host, u32 *cid)
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{
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int err;
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struct mmc_command cmd;
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BUG_ON(!host);
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BUG_ON(!cid);
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memset(&cmd, 0, sizeof(struct mmc_command));
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cmd.opcode = MMC_ALL_SEND_CID;
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cmd.arg = 0;
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cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
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err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
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if (err)
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return err;
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memcpy(cid, cmd.resp, sizeof(u32) * 4);
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return 0;
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}
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int mmc_set_relative_addr(struct mmc_card *card)
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{
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int err;
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struct mmc_command cmd;
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BUG_ON(!card);
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BUG_ON(!card->host);
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memset(&cmd, 0, sizeof(struct mmc_command));
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cmd.opcode = MMC_SET_RELATIVE_ADDR;
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cmd.arg = card->rca << 16;
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cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
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err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
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if (err)
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return err;
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return 0;
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}
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static int
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mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
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{
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int err;
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struct mmc_command cmd;
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BUG_ON(!host);
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BUG_ON(!cxd);
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memset(&cmd, 0, sizeof(struct mmc_command));
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cmd.opcode = opcode;
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cmd.arg = arg;
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cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
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err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
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if (err)
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return err;
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memcpy(cxd, cmd.resp, sizeof(u32) * 4);
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return 0;
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}
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static int
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mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
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u32 opcode, void *buf, unsigned len)
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{
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struct mmc_request mrq;
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struct mmc_command cmd;
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struct mmc_data data;
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struct scatterlist sg;
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void *data_buf;
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/* dma onto stack is unsafe/nonportable, but callers to this
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* routine normally provide temporary on-stack buffers ...
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*/
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data_buf = kmalloc(len, GFP_KERNEL);
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if (data_buf == NULL)
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return -ENOMEM;
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memset(&mrq, 0, sizeof(struct mmc_request));
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memset(&cmd, 0, sizeof(struct mmc_command));
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memset(&data, 0, sizeof(struct mmc_data));
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mrq.cmd = &cmd;
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mrq.data = &data;
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cmd.opcode = opcode;
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cmd.arg = 0;
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/* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
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* rely on callers to never use this with "native" calls for reading
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* CSD or CID. Native versions of those commands use the R2 type,
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* not R1 plus a data block.
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*/
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cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
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data.blksz = len;
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data.blocks = 1;
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data.flags = MMC_DATA_READ;
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data.sg = &sg;
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data.sg_len = 1;
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sg_init_one(&sg, data_buf, len);
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if (opcode == MMC_SEND_CSD || opcode == MMC_SEND_CID) {
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/*
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* The spec states that CSR and CID accesses have a timeout
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* of 64 clock cycles.
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*/
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data.timeout_ns = 0;
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data.timeout_clks = 64;
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} else
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mmc_set_data_timeout(&data, card);
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mmc_wait_for_req(host, &mrq);
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memcpy(buf, data_buf, len);
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kfree(data_buf);
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if (cmd.error)
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return cmd.error;
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if (data.error)
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return data.error;
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return 0;
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}
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int mmc_send_csd(struct mmc_card *card, u32 *csd)
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{
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int ret, i;
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if (!mmc_host_is_spi(card->host))
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return mmc_send_cxd_native(card->host, card->rca << 16,
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csd, MMC_SEND_CSD);
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ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd, 16);
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if (ret)
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return ret;
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for (i = 0;i < 4;i++)
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csd[i] = be32_to_cpu(csd[i]);
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return 0;
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}
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int mmc_send_cid(struct mmc_host *host, u32 *cid)
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{
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int ret, i;
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if (!mmc_host_is_spi(host)) {
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if (!host->card)
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return -EINVAL;
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return mmc_send_cxd_native(host, host->card->rca << 16,
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cid, MMC_SEND_CID);
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}
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ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid, 16);
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if (ret)
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return ret;
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for (i = 0;i < 4;i++)
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cid[i] = be32_to_cpu(cid[i]);
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return 0;
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}
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int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd)
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{
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return mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD,
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ext_csd, 512);
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}
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int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
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{
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struct mmc_command cmd;
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int err;
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memset(&cmd, 0, sizeof(struct mmc_command));
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cmd.opcode = MMC_SPI_READ_OCR;
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cmd.arg = highcap ? (1 << 30) : 0;
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cmd.flags = MMC_RSP_SPI_R3;
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err = mmc_wait_for_cmd(host, &cmd, 0);
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*ocrp = cmd.resp[1];
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return err;
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}
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int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
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{
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struct mmc_command cmd;
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int err;
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memset(&cmd, 0, sizeof(struct mmc_command));
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cmd.opcode = MMC_SPI_CRC_ON_OFF;
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cmd.flags = MMC_RSP_SPI_R1;
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cmd.arg = use_crc;
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err = mmc_wait_for_cmd(host, &cmd, 0);
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if (!err)
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host->use_spi_crc = use_crc;
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return err;
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}
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/**
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* mmc_switch - modify EXT_CSD register
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* @card: the MMC card associated with the data transfer
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* @set: cmd set values
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* @index: EXT_CSD register index
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* @value: value to program into EXT_CSD register
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* @timeout_ms: timeout (ms) for operation performed by register write,
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* timeout of zero implies maximum possible timeout
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*
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* Modifies the EXT_CSD register for selected card.
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*/
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int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
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unsigned int timeout_ms)
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{
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int err;
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struct mmc_command cmd;
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u32 status;
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BUG_ON(!card);
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BUG_ON(!card->host);
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memset(&cmd, 0, sizeof(struct mmc_command));
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cmd.opcode = MMC_SWITCH;
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cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
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(index << 16) |
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(value << 8) |
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set;
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cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
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cmd.cmd_timeout_ms = timeout_ms;
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err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
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if (err)
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return err;
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/* Must check status to be sure of no errors */
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do {
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err = mmc_send_status(card, &status);
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if (err)
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return err;
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if (card->host->caps & MMC_CAP_WAIT_WHILE_BUSY)
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break;
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if (mmc_host_is_spi(card->host))
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break;
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} while (R1_CURRENT_STATE(status) == 7);
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if (mmc_host_is_spi(card->host)) {
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if (status & R1_SPI_ILLEGAL_COMMAND)
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return -EBADMSG;
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} else {
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if (status & 0xFDFFA000)
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printk(KERN_WARNING "%s: unexpected status %#x after "
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"switch", mmc_hostname(card->host), status);
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if (status & R1_SWITCH_ERROR)
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return -EBADMSG;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(mmc_switch);
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int mmc_send_status(struct mmc_card *card, u32 *status)
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{
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int err;
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struct mmc_command cmd;
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BUG_ON(!card);
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BUG_ON(!card->host);
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memset(&cmd, 0, sizeof(struct mmc_command));
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cmd.opcode = MMC_SEND_STATUS;
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if (!mmc_host_is_spi(card->host))
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cmd.arg = card->rca << 16;
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cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
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err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
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if (err)
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return err;
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/* NOTE: callers are required to understand the difference
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* between "native" and SPI format status words!
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*/
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if (status)
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*status = cmd.resp[0];
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return 0;
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}
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static int
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mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode,
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u8 len)
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{
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struct mmc_request mrq;
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struct mmc_command cmd;
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struct mmc_data data;
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struct scatterlist sg;
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u8 *data_buf;
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u8 *test_buf;
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int i, err;
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static u8 testdata_8bit[8] = { 0x55, 0xaa, 0, 0, 0, 0, 0, 0 };
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static u8 testdata_4bit[4] = { 0x5a, 0, 0, 0 };
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/* dma onto stack is unsafe/nonportable, but callers to this
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* routine normally provide temporary on-stack buffers ...
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*/
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data_buf = kmalloc(len, GFP_KERNEL);
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if (!data_buf)
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return -ENOMEM;
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if (len == 8)
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test_buf = testdata_8bit;
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else if (len == 4)
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test_buf = testdata_4bit;
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else {
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printk(KERN_ERR "%s: Invalid bus_width %d\n",
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mmc_hostname(host), len);
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kfree(data_buf);
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return -EINVAL;
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}
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if (opcode == MMC_BUS_TEST_W)
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memcpy(data_buf, test_buf, len);
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memset(&mrq, 0, sizeof(struct mmc_request));
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memset(&cmd, 0, sizeof(struct mmc_command));
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memset(&data, 0, sizeof(struct mmc_data));
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mrq.cmd = &cmd;
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mrq.data = &data;
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cmd.opcode = opcode;
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cmd.arg = 0;
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/* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
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* rely on callers to never use this with "native" calls for reading
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* CSD or CID. Native versions of those commands use the R2 type,
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* not R1 plus a data block.
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*/
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cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
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data.blksz = len;
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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;
|
|
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;
|
|
}
|
|
|
|
int mmc_bus_test(struct mmc_card *card, u8 bus_width)
|
|
{
|
|
int err, 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);
|
|
err = mmc_send_bus_test(card, card->host, MMC_BUS_TEST_R, width);
|
|
return err;
|
|
}
|