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af51715079
Teach the MMC/SD/SDIO core about using SPI mode.
- Use mmc_host_is_spi() so enumeration works through SPI signaling
and protocols, not just the native versions.
- Provide the SPI response type flags with each request issued,
including requests from the new lock/unlock code.
- Understand that cmd->resp[0] and mmc_get_status() results for SPI
return different values than for "native" MMC/SD protocol; this
affects resetting, checking card lock status, and some others.
- Understand that some commands act a bit differently ... notably:
* OP_COND command doesn't return the OCR
* APP_CMD status doesn't have an R1_APP_CMD analogue
Those changes required some new and updated primitives:
- Provide utilities to access two SPI-only requests, and one
request that wasn't previously needed:
* mmc_spi_read_ocr() ... SPI only
* mmc_spi_set_crc() ... SPI only (override by module parm)
* mmc_send_cid() ... for use without broadcast mode
- Updated internal routines:
* Previous mmc_send_csd() modified into mmc_send_cxd_native();
it uses native "R2" responses, which include 16 bytes of data.
* Previous mmc_send_ext_csd() becomes new mmc_send_cxd_data()
helper for command-and-data access
* Bugfix to that mmc_send_cxd_data() code: dma-to-stack is
unsafe/nonportable, so kmalloc a bounce buffer instead.
- Modified mmc_send_ext_csd() now uses mmc_send_cxd_data() helper
- Modified mmc_send_csd(), and new mmc_spi_send_cid(), routines use
those helper routines based on whether they're native or SPI
The newest categories of cards supported by the MMC stack aren't expected
to work yet with SPI: MMC or SD cards with over 4GB data, and SDIO.
All those cards support SPI mode, so eventually they should work too.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
351 lines
6.9 KiB
C
351 lines
6.9 KiB
C
/*
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* linux/drivers/mmc/core/sd_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 <linux/mmc/sd.h>
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#include "core.h"
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#include "sd_ops.h"
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static int mmc_app_cmd(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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BUG_ON(card && (card->host != host));
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cmd.opcode = MMC_APP_CMD;
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if (card) {
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cmd.arg = card->rca << 16;
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cmd.flags = MMC_RSP_SPI_R1 | 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_SPI_R1 | MMC_RSP_R1 | MMC_CMD_BCR;
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}
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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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/* Check that card supported application commands */
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if (!mmc_host_is_spi(host) && !(cmd.resp[0] & R1_APP_CMD))
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return -EOPNOTSUPP;
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return 0;
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}
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/**
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* mmc_wait_for_app_cmd - start an application command and wait for
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completion
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* @host: MMC host to start command
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* @card: Card to send MMC_APP_CMD to
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* @cmd: MMC command to start
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* @retries: maximum number of retries
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*
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* Sends a MMC_APP_CMD, checks the card response, sends the command
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* in the parameter and waits for it to complete. Return any error
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* that occurred while the command was executing. Do not attempt to
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* parse the response.
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*/
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int mmc_wait_for_app_cmd(struct mmc_host *host, struct mmc_card *card,
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struct mmc_command *cmd, int retries)
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{
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struct mmc_request mrq;
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int i, err;
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BUG_ON(!cmd);
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BUG_ON(retries < 0);
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err = -EIO;
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/*
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* We have to resend MMC_APP_CMD for each attempt so
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* we cannot use the retries field in mmc_command.
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*/
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for (i = 0;i <= retries;i++) {
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memset(&mrq, 0, sizeof(struct mmc_request));
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err = mmc_app_cmd(host, card);
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if (err) {
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/* no point in retrying; no APP commands allowed */
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if (mmc_host_is_spi(host)) {
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if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
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break;
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}
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continue;
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}
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memset(&mrq, 0, sizeof(struct mmc_request));
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memset(cmd->resp, 0, sizeof(cmd->resp));
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cmd->retries = 0;
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mrq.cmd = cmd;
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cmd->data = NULL;
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mmc_wait_for_req(host, &mrq);
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err = cmd->error;
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if (!cmd->error)
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break;
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/* no point in retrying illegal APP commands */
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if (mmc_host_is_spi(host)) {
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if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
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break;
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}
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}
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return err;
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}
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EXPORT_SYMBOL(mmc_wait_for_app_cmd);
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int mmc_app_set_bus_width(struct mmc_card *card, int width)
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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 = SD_APP_SET_BUS_WIDTH;
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cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
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switch (width) {
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case MMC_BUS_WIDTH_1:
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cmd.arg = SD_BUS_WIDTH_1;
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break;
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case MMC_BUS_WIDTH_4:
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cmd.arg = SD_BUS_WIDTH_4;
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break;
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default:
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return -EINVAL;
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}
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err = mmc_wait_for_app_cmd(card->host, card, &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_app_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 = SD_APP_OP_COND;
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if (mmc_host_is_spi(host))
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cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */
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else
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cmd.arg = 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_app_cmd(host, NULL, &cmd, MMC_CMD_RETRIES);
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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_send_if_cond(struct mmc_host *host, u32 ocr)
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{
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struct mmc_command cmd;
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int err;
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static const u8 test_pattern = 0xAA;
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u8 result_pattern;
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/*
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* To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
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* before SD_APP_OP_COND. This command will harmlessly fail for
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* SD 1.0 cards.
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*/
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cmd.opcode = SD_SEND_IF_COND;
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cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
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cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR;
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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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if (mmc_host_is_spi(host))
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result_pattern = cmd.resp[1] & 0xFF;
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else
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result_pattern = cmd.resp[0] & 0xFF;
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if (result_pattern != test_pattern)
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return -EIO;
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return 0;
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}
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int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca)
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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(!rca);
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memset(&cmd, 0, sizeof(struct mmc_command));
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cmd.opcode = SD_SEND_RELATIVE_ADDR;
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cmd.arg = 0;
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cmd.flags = MMC_RSP_R6 | 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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*rca = cmd.resp[0] >> 16;
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return 0;
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}
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int mmc_app_send_scr(struct mmc_card *card, u32 *scr)
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{
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int err;
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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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BUG_ON(!card);
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BUG_ON(!card->host);
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BUG_ON(!scr);
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/* NOTE: caller guarantees scr is heap-allocated */
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err = mmc_app_cmd(card->host, card);
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if (err)
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return err;
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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 = SD_APP_SEND_SCR;
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cmd.arg = 0;
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cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
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data.blksz = 8;
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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, scr, 8);
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mmc_set_data_timeout(&data, card);
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mmc_wait_for_req(card->host, &mrq);
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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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scr[0] = ntohl(scr[0]);
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scr[1] = ntohl(scr[1]);
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return 0;
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}
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int mmc_sd_switch(struct mmc_card *card, int mode, int group,
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u8 value, u8 *resp)
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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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BUG_ON(!card);
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BUG_ON(!card->host);
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/* NOTE: caller guarantees resp is heap-allocated */
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mode = !!mode;
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value &= 0xF;
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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 = SD_SWITCH;
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cmd.arg = mode << 31 | 0x00FFFFFF;
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cmd.arg &= ~(0xF << (group * 4));
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cmd.arg |= value << (group * 4);
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cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
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data.blksz = 64;
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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, resp, 64);
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mmc_set_data_timeout(&data, card);
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mmc_wait_for_req(card->host, &mrq);
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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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