78e480731a
MMC over SPI sends the CID and CSD registers as data, not responses, which means that the host driver won't do the necessary byte flipping for us. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
399 lines
7.7 KiB
C
399 lines
7.7 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/types.h>
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#include <asm/scatterlist.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_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 accomodate 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 (card)
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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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int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value)
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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_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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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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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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