![Russell King](/assets/img/avatar_default.png)
Rather than having two places which independently calculate the timeout for data transfers, make it a library function instead. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Pierre Ossman <drzeus@drzeus.cx>
1356 lines
31 KiB
C
1356 lines
31 KiB
C
/*
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* linux/drivers/mmc/mmc.c
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*
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* Copyright (C) 2003-2004 Russell King, All Rights Reserved.
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* SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
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* SD support Copyright (C) 2005 Pierre Ossman, All Rights Reserved.
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/completion.h>
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#include <linux/device.h>
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#include <linux/delay.h>
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#include <linux/pagemap.h>
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#include <linux/err.h>
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#include <asm/scatterlist.h>
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#include <linux/scatterlist.h>
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#include <linux/mmc/card.h>
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#include <linux/mmc/host.h>
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#include <linux/mmc/protocol.h>
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#include "mmc.h"
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#define CMD_RETRIES 3
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/*
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* OCR Bit positions to 10s of Vdd mV.
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*/
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static const unsigned short mmc_ocr_bit_to_vdd[] = {
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150, 155, 160, 165, 170, 180, 190, 200,
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210, 220, 230, 240, 250, 260, 270, 280,
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290, 300, 310, 320, 330, 340, 350, 360
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};
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static const unsigned int tran_exp[] = {
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10000, 100000, 1000000, 10000000,
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0, 0, 0, 0
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};
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static const unsigned char tran_mant[] = {
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0, 10, 12, 13, 15, 20, 25, 30,
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35, 40, 45, 50, 55, 60, 70, 80,
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};
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static const unsigned int tacc_exp[] = {
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1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
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};
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static const unsigned int tacc_mant[] = {
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0, 10, 12, 13, 15, 20, 25, 30,
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35, 40, 45, 50, 55, 60, 70, 80,
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};
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/**
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* mmc_request_done - finish processing an MMC request
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* @host: MMC host which completed request
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* @mrq: MMC request which request
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*
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* MMC drivers should call this function when they have completed
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* their processing of a request.
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*/
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void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
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{
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struct mmc_command *cmd = mrq->cmd;
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int err = cmd->error;
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pr_debug("%s: req done (CMD%u): %d/%d/%d: %08x %08x %08x %08x\n",
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mmc_hostname(host), cmd->opcode, err,
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mrq->data ? mrq->data->error : 0,
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mrq->stop ? mrq->stop->error : 0,
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cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3]);
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if (err && cmd->retries) {
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cmd->retries--;
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cmd->error = 0;
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host->ops->request(host, mrq);
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} else if (mrq->done) {
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mrq->done(mrq);
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}
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}
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EXPORT_SYMBOL(mmc_request_done);
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/**
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* mmc_start_request - start a command on a host
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* @host: MMC host to start command on
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* @mrq: MMC request to start
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*
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* Queue a command on the specified host. We expect the
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* caller to be holding the host lock with interrupts disabled.
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*/
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void
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mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
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{
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pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
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mmc_hostname(host), mrq->cmd->opcode,
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mrq->cmd->arg, mrq->cmd->flags);
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WARN_ON(host->card_busy == NULL);
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mrq->cmd->error = 0;
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mrq->cmd->mrq = mrq;
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if (mrq->data) {
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mrq->cmd->data = mrq->data;
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mrq->data->error = 0;
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mrq->data->mrq = mrq;
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if (mrq->stop) {
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mrq->data->stop = mrq->stop;
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mrq->stop->error = 0;
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mrq->stop->mrq = mrq;
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}
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}
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host->ops->request(host, mrq);
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}
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EXPORT_SYMBOL(mmc_start_request);
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static void mmc_wait_done(struct mmc_request *mrq)
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{
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complete(mrq->done_data);
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}
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int mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
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{
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DECLARE_COMPLETION_ONSTACK(complete);
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mrq->done_data = &complete;
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mrq->done = mmc_wait_done;
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mmc_start_request(host, mrq);
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wait_for_completion(&complete);
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return 0;
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}
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EXPORT_SYMBOL(mmc_wait_for_req);
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/**
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* mmc_wait_for_cmd - start a command and wait for completion
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* @host: MMC host to start command
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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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* Start a new MMC command for a host, and wait for the command
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* to complete. Return any error that occurred while the command
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* was executing. Do not attempt to parse the response.
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*/
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int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
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{
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struct mmc_request mrq;
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BUG_ON(host->card_busy == NULL);
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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 = retries;
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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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return cmd->error;
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}
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EXPORT_SYMBOL(mmc_wait_for_cmd);
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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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* @rca: RCA 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, unsigned int rca,
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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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struct mmc_command appcmd;
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int i, err;
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BUG_ON(host->card_busy == NULL);
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BUG_ON(retries < 0);
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err = MMC_ERR_INVALID;
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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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appcmd.opcode = MMC_APP_CMD;
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appcmd.arg = rca << 16;
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appcmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
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appcmd.retries = 0;
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memset(appcmd.resp, 0, sizeof(appcmd.resp));
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appcmd.data = NULL;
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mrq.cmd = &appcmd;
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appcmd.data = NULL;
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mmc_wait_for_req(host, &mrq);
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if (appcmd.error) {
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err = appcmd.error;
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continue;
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}
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/* Check that card supported application commands */
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if (!(appcmd.resp[0] & R1_APP_CMD))
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return MMC_ERR_FAILED;
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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 == MMC_ERR_NONE)
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break;
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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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/**
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* mmc_set_data_timeout - set the timeout for a data command
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* @data: data phase for command
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* @card: the MMC card associated with the data transfer
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* @write: flag to differentiate reads from writes
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*/
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void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card,
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int write)
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{
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unsigned int mult;
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/*
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* SD cards use a 100 multiplier rather than 10
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*/
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mult = mmc_card_sd(card) ? 100 : 10;
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/*
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* Scale up the multiplier (and therefore the timeout) by
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* the r2w factor for writes.
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*/
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if (write)
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mult <<= card->csd.r2w_factor;
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data->timeout_ns = card->csd.tacc_ns * mult;
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data->timeout_clks = card->csd.tacc_clks * mult;
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/*
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* SD cards also have an upper limit on the timeout.
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*/
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if (mmc_card_sd(card)) {
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unsigned int timeout_us, limit_us;
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timeout_us = data->timeout_ns / 1000;
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timeout_us += data->timeout_clks * 1000 /
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(card->host->ios.clock / 1000);
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if (write)
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limit_us = 250000;
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else
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limit_us = 100000;
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if (timeout_us > limit_us) {
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data->timeout_ns = limit_us * 1000;
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data->timeout_clks = 0;
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}
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}
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}
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EXPORT_SYMBOL(mmc_set_data_timeout);
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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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* __mmc_claim_host - exclusively claim a host
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* @host: mmc host to claim
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* @card: mmc card to claim host for
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*
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* Claim a host for a set of operations. If a valid card
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* is passed and this wasn't the last card selected, select
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* the card before returning.
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*
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* Note: you should use mmc_card_claim_host or mmc_claim_host.
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*/
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int __mmc_claim_host(struct mmc_host *host, struct mmc_card *card)
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{
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DECLARE_WAITQUEUE(wait, current);
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unsigned long flags;
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int err = 0;
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add_wait_queue(&host->wq, &wait);
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spin_lock_irqsave(&host->lock, flags);
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while (1) {
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set_current_state(TASK_UNINTERRUPTIBLE);
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if (host->card_busy == NULL)
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break;
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spin_unlock_irqrestore(&host->lock, flags);
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schedule();
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spin_lock_irqsave(&host->lock, flags);
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}
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set_current_state(TASK_RUNNING);
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host->card_busy = card;
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spin_unlock_irqrestore(&host->lock, flags);
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remove_wait_queue(&host->wq, &wait);
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if (card != (void *)-1) {
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err = mmc_select_card(host, card);
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if (err != MMC_ERR_NONE)
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return err;
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}
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return err;
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}
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EXPORT_SYMBOL(__mmc_claim_host);
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/**
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* mmc_release_host - release a host
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* @host: mmc host to release
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*
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* Release a MMC host, allowing others to claim the host
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* for their operations.
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*/
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void mmc_release_host(struct mmc_host *host)
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{
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unsigned long flags;
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BUG_ON(host->card_busy == NULL);
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spin_lock_irqsave(&host->lock, flags);
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host->card_busy = NULL;
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spin_unlock_irqrestore(&host->lock, flags);
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wake_up(&host->wq);
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}
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EXPORT_SYMBOL(mmc_release_host);
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static inline void mmc_set_ios(struct mmc_host *host)
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{
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struct mmc_ios *ios = &host->ios;
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pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u width %u\n",
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mmc_hostname(host), ios->clock, ios->bus_mode,
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ios->power_mode, ios->chip_select, ios->vdd,
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ios->bus_width);
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host->ops->set_ios(host, ios);
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}
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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->card_busy == NULL);
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if (host->card_selected == card)
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return MMC_ERR_NONE;
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host->card_selected = card;
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cmd.opcode = MMC_SELECT_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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err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
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if (err != MMC_ERR_NONE)
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return err;
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/*
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* Default bus width is 1 bit.
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*/
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host->ios.bus_width = MMC_BUS_WIDTH_1;
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/*
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* We can only change the bus width of the selected
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* card so therefore we have to put the handling
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* here.
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*/
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if (host->caps & MMC_CAP_4_BIT_DATA) {
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/*
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* The card is in 1 bit mode by default so
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* we only need to change if it supports the
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* wider version.
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*/
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if (mmc_card_sd(card) &&
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(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
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struct mmc_command cmd;
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cmd.opcode = SD_APP_SET_BUS_WIDTH;
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cmd.arg = SD_BUS_WIDTH_4;
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cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
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err = mmc_wait_for_app_cmd(host, card->rca, &cmd,
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CMD_RETRIES);
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if (err != MMC_ERR_NONE)
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return err;
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host->ios.bus_width = MMC_BUS_WIDTH_4;
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}
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}
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mmc_set_ios(host);
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return MMC_ERR_NONE;
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}
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/*
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* Ensure that no card is selected.
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*/
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static void mmc_deselect_cards(struct mmc_host *host)
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{
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struct mmc_command cmd;
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if (host->card_selected) {
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host->card_selected = NULL;
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cmd.opcode = MMC_SELECT_CARD;
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cmd.arg = 0;
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cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
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mmc_wait_for_cmd(host, &cmd, 0);
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}
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}
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static inline void mmc_delay(unsigned int ms)
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{
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if (ms < HZ / 1000) {
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yield();
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mdelay(ms);
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} else {
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msleep_interruptible (ms);
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}
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}
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/*
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* Mask off any voltages we don't support and select
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* the lowest voltage
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*/
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static u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
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{
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int bit;
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ocr &= host->ocr_avail;
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bit = ffs(ocr);
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if (bit) {
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bit -= 1;
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ocr = 3 << bit;
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host->ios.vdd = bit;
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mmc_set_ios(host);
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} else {
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ocr = 0;
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}
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return ocr;
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}
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#define UNSTUFF_BITS(resp,start,size) \
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({ \
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const int __size = size; \
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const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
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const int __off = 3 - ((start) / 32); \
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const int __shft = (start) & 31; \
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u32 __res; \
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\
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__res = resp[__off] >> __shft; \
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if (__size + __shft > 32) \
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__res |= resp[__off-1] << ((32 - __shft) % 32); \
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__res & __mask; \
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})
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/*
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* Given the decoded CSD structure, decode the raw CID to our CID structure.
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*/
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static void mmc_decode_cid(struct mmc_card *card)
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{
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u32 *resp = card->raw_cid;
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memset(&card->cid, 0, sizeof(struct mmc_cid));
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if (mmc_card_sd(card)) {
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/*
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* SD doesn't currently have a version field so we will
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* have to assume we can parse this.
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*/
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card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
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card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
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card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
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card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
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card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
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card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
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card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
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card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
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card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
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card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
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card->cid.year = UNSTUFF_BITS(resp, 12, 8);
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card->cid.month = UNSTUFF_BITS(resp, 8, 4);
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card->cid.year += 2000; /* SD cards year offset */
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} else {
|
|
/*
|
|
* The selection of the format here is based upon published
|
|
* specs from sandisk and from what people have reported.
|
|
*/
|
|
switch (card->csd.mmca_vsn) {
|
|
case 0: /* MMC v1.0 - v1.2 */
|
|
case 1: /* MMC v1.4 */
|
|
card->cid.manfid = UNSTUFF_BITS(resp, 104, 24);
|
|
card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
|
|
card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
|
|
card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
|
|
card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
|
|
card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
|
|
card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
|
|
card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8);
|
|
card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4);
|
|
card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4);
|
|
card->cid.serial = UNSTUFF_BITS(resp, 16, 24);
|
|
card->cid.month = UNSTUFF_BITS(resp, 12, 4);
|
|
card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
|
|
break;
|
|
|
|
case 2: /* MMC v2.0 - v2.2 */
|
|
case 3: /* MMC v3.1 - v3.3 */
|
|
case 4: /* MMC v4 */
|
|
card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
|
|
card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
|
|
card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
|
|
card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
|
|
card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
|
|
card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
|
|
card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
|
|
card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
|
|
card->cid.serial = UNSTUFF_BITS(resp, 16, 32);
|
|
card->cid.month = UNSTUFF_BITS(resp, 12, 4);
|
|
card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
|
|
break;
|
|
|
|
default:
|
|
printk("%s: card has unknown MMCA version %d\n",
|
|
mmc_hostname(card->host), card->csd.mmca_vsn);
|
|
mmc_card_set_bad(card);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Given a 128-bit response, decode to our card CSD structure.
|
|
*/
|
|
static void mmc_decode_csd(struct mmc_card *card)
|
|
{
|
|
struct mmc_csd *csd = &card->csd;
|
|
unsigned int e, m, csd_struct;
|
|
u32 *resp = card->raw_csd;
|
|
|
|
if (mmc_card_sd(card)) {
|
|
csd_struct = UNSTUFF_BITS(resp, 126, 2);
|
|
if (csd_struct != 0) {
|
|
printk("%s: unrecognised CSD structure version %d\n",
|
|
mmc_hostname(card->host), csd_struct);
|
|
mmc_card_set_bad(card);
|
|
return;
|
|
}
|
|
|
|
m = UNSTUFF_BITS(resp, 115, 4);
|
|
e = UNSTUFF_BITS(resp, 112, 3);
|
|
csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
|
|
csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
|
|
|
|
m = UNSTUFF_BITS(resp, 99, 4);
|
|
e = UNSTUFF_BITS(resp, 96, 3);
|
|
csd->max_dtr = tran_exp[e] * tran_mant[m];
|
|
csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
|
|
|
|
e = UNSTUFF_BITS(resp, 47, 3);
|
|
m = UNSTUFF_BITS(resp, 62, 12);
|
|
csd->capacity = (1 + m) << (e + 2);
|
|
|
|
csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
|
|
csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
|
|
csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
|
|
csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
|
|
csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
|
|
csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
|
|
csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
|
|
} else {
|
|
/*
|
|
* We only understand CSD structure v1.1 and v1.2.
|
|
* v1.2 has extra information in bits 15, 11 and 10.
|
|
*/
|
|
csd_struct = UNSTUFF_BITS(resp, 126, 2);
|
|
if (csd_struct != 1 && csd_struct != 2) {
|
|
printk("%s: unrecognised CSD structure version %d\n",
|
|
mmc_hostname(card->host), csd_struct);
|
|
mmc_card_set_bad(card);
|
|
return;
|
|
}
|
|
|
|
csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4);
|
|
m = UNSTUFF_BITS(resp, 115, 4);
|
|
e = UNSTUFF_BITS(resp, 112, 3);
|
|
csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
|
|
csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
|
|
|
|
m = UNSTUFF_BITS(resp, 99, 4);
|
|
e = UNSTUFF_BITS(resp, 96, 3);
|
|
csd->max_dtr = tran_exp[e] * tran_mant[m];
|
|
csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
|
|
|
|
e = UNSTUFF_BITS(resp, 47, 3);
|
|
m = UNSTUFF_BITS(resp, 62, 12);
|
|
csd->capacity = (1 + m) << (e + 2);
|
|
|
|
csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
|
|
csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
|
|
csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
|
|
csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
|
|
csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
|
|
csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
|
|
csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Given a 64-bit response, decode to our card SCR structure.
|
|
*/
|
|
static void mmc_decode_scr(struct mmc_card *card)
|
|
{
|
|
struct sd_scr *scr = &card->scr;
|
|
unsigned int scr_struct;
|
|
u32 resp[4];
|
|
|
|
BUG_ON(!mmc_card_sd(card));
|
|
|
|
resp[3] = card->raw_scr[1];
|
|
resp[2] = card->raw_scr[0];
|
|
|
|
scr_struct = UNSTUFF_BITS(resp, 60, 4);
|
|
if (scr_struct != 0) {
|
|
printk("%s: unrecognised SCR structure version %d\n",
|
|
mmc_hostname(card->host), scr_struct);
|
|
mmc_card_set_bad(card);
|
|
return;
|
|
}
|
|
|
|
scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
|
|
scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
|
|
}
|
|
|
|
/*
|
|
* Locate a MMC card on this MMC host given a raw CID.
|
|
*/
|
|
static struct mmc_card *mmc_find_card(struct mmc_host *host, u32 *raw_cid)
|
|
{
|
|
struct mmc_card *card;
|
|
|
|
list_for_each_entry(card, &host->cards, node) {
|
|
if (memcmp(card->raw_cid, raw_cid, sizeof(card->raw_cid)) == 0)
|
|
return card;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Allocate a new MMC card, and assign a unique RCA.
|
|
*/
|
|
static struct mmc_card *
|
|
mmc_alloc_card(struct mmc_host *host, u32 *raw_cid, unsigned int *frca)
|
|
{
|
|
struct mmc_card *card, *c;
|
|
unsigned int rca = *frca;
|
|
|
|
card = kmalloc(sizeof(struct mmc_card), GFP_KERNEL);
|
|
if (!card)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
mmc_init_card(card, host);
|
|
memcpy(card->raw_cid, raw_cid, sizeof(card->raw_cid));
|
|
|
|
again:
|
|
list_for_each_entry(c, &host->cards, node)
|
|
if (c->rca == rca) {
|
|
rca++;
|
|
goto again;
|
|
}
|
|
|
|
card->rca = rca;
|
|
|
|
*frca = rca;
|
|
|
|
return card;
|
|
}
|
|
|
|
/*
|
|
* Tell attached cards to go to IDLE state
|
|
*/
|
|
static void mmc_idle_cards(struct mmc_host *host)
|
|
{
|
|
struct mmc_command cmd;
|
|
|
|
host->ios.chip_select = MMC_CS_HIGH;
|
|
mmc_set_ios(host);
|
|
|
|
mmc_delay(1);
|
|
|
|
cmd.opcode = MMC_GO_IDLE_STATE;
|
|
cmd.arg = 0;
|
|
cmd.flags = MMC_RSP_NONE | MMC_CMD_BC;
|
|
|
|
mmc_wait_for_cmd(host, &cmd, 0);
|
|
|
|
mmc_delay(1);
|
|
|
|
host->ios.chip_select = MMC_CS_DONTCARE;
|
|
mmc_set_ios(host);
|
|
|
|
mmc_delay(1);
|
|
}
|
|
|
|
/*
|
|
* Apply power to the MMC stack. This is a two-stage process.
|
|
* First, we enable power to the card without the clock running.
|
|
* We then wait a bit for the power to stabilise. Finally,
|
|
* enable the bus drivers and clock to the card.
|
|
*
|
|
* We must _NOT_ enable the clock prior to power stablising.
|
|
*
|
|
* If a host does all the power sequencing itself, ignore the
|
|
* initial MMC_POWER_UP stage.
|
|
*/
|
|
static void mmc_power_up(struct mmc_host *host)
|
|
{
|
|
int bit = fls(host->ocr_avail) - 1;
|
|
|
|
host->ios.vdd = bit;
|
|
host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
|
|
host->ios.chip_select = MMC_CS_DONTCARE;
|
|
host->ios.power_mode = MMC_POWER_UP;
|
|
host->ios.bus_width = MMC_BUS_WIDTH_1;
|
|
mmc_set_ios(host);
|
|
|
|
mmc_delay(1);
|
|
|
|
host->ios.clock = host->f_min;
|
|
host->ios.power_mode = MMC_POWER_ON;
|
|
mmc_set_ios(host);
|
|
|
|
mmc_delay(2);
|
|
}
|
|
|
|
static void mmc_power_off(struct mmc_host *host)
|
|
{
|
|
host->ios.clock = 0;
|
|
host->ios.vdd = 0;
|
|
host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
|
|
host->ios.chip_select = MMC_CS_DONTCARE;
|
|
host->ios.power_mode = MMC_POWER_OFF;
|
|
host->ios.bus_width = MMC_BUS_WIDTH_1;
|
|
mmc_set_ios(host);
|
|
}
|
|
|
|
static 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 = ocr;
|
|
cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;
|
|
|
|
for (i = 100; i; i--) {
|
|
err = mmc_wait_for_cmd(host, &cmd, 0);
|
|
if (err != MMC_ERR_NONE)
|
|
break;
|
|
|
|
if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
|
|
break;
|
|
|
|
err = MMC_ERR_TIMEOUT;
|
|
|
|
mmc_delay(10);
|
|
}
|
|
|
|
if (rocr)
|
|
*rocr = cmd.resp[0];
|
|
|
|
return err;
|
|
}
|
|
|
|
static int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
|
|
{
|
|
struct mmc_command cmd;
|
|
int i, err = 0;
|
|
|
|
cmd.opcode = SD_APP_OP_COND;
|
|
cmd.arg = ocr;
|
|
cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;
|
|
|
|
for (i = 100; i; i--) {
|
|
err = mmc_wait_for_app_cmd(host, 0, &cmd, CMD_RETRIES);
|
|
if (err != MMC_ERR_NONE)
|
|
break;
|
|
|
|
if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
|
|
break;
|
|
|
|
err = MMC_ERR_TIMEOUT;
|
|
|
|
mmc_delay(10);
|
|
}
|
|
|
|
if (rocr)
|
|
*rocr = cmd.resp[0];
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Discover cards by requesting their CID. If this command
|
|
* times out, it is not an error; there are no further cards
|
|
* to be discovered. Add new cards to the list.
|
|
*
|
|
* Create a mmc_card entry for each discovered card, assigning
|
|
* it an RCA, and save the raw CID for decoding later.
|
|
*/
|
|
static void mmc_discover_cards(struct mmc_host *host)
|
|
{
|
|
struct mmc_card *card;
|
|
unsigned int first_rca = 1, err;
|
|
|
|
while (1) {
|
|
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, CMD_RETRIES);
|
|
if (err == MMC_ERR_TIMEOUT) {
|
|
err = MMC_ERR_NONE;
|
|
break;
|
|
}
|
|
if (err != MMC_ERR_NONE) {
|
|
printk(KERN_ERR "%s: error requesting CID: %d\n",
|
|
mmc_hostname(host), err);
|
|
break;
|
|
}
|
|
|
|
card = mmc_find_card(host, cmd.resp);
|
|
if (!card) {
|
|
card = mmc_alloc_card(host, cmd.resp, &first_rca);
|
|
if (IS_ERR(card)) {
|
|
err = PTR_ERR(card);
|
|
break;
|
|
}
|
|
list_add(&card->node, &host->cards);
|
|
}
|
|
|
|
card->state &= ~MMC_STATE_DEAD;
|
|
|
|
if (host->mode == MMC_MODE_SD) {
|
|
mmc_card_set_sd(card);
|
|
|
|
cmd.opcode = SD_SEND_RELATIVE_ADDR;
|
|
cmd.arg = 0;
|
|
cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
|
|
|
|
err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
|
|
if (err != MMC_ERR_NONE)
|
|
mmc_card_set_dead(card);
|
|
else {
|
|
card->rca = cmd.resp[0] >> 16;
|
|
|
|
if (!host->ops->get_ro) {
|
|
printk(KERN_WARNING "%s: host does not "
|
|
"support reading read-only "
|
|
"switch. assuming write-enable.\n",
|
|
mmc_hostname(host));
|
|
} else {
|
|
if (host->ops->get_ro(host))
|
|
mmc_card_set_readonly(card);
|
|
}
|
|
}
|
|
} else {
|
|
cmd.opcode = MMC_SET_RELATIVE_ADDR;
|
|
cmd.arg = card->rca << 16;
|
|
cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
|
|
|
|
err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
|
|
if (err != MMC_ERR_NONE)
|
|
mmc_card_set_dead(card);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void mmc_read_csds(struct mmc_host *host)
|
|
{
|
|
struct mmc_card *card;
|
|
|
|
list_for_each_entry(card, &host->cards, node) {
|
|
struct mmc_command cmd;
|
|
int err;
|
|
|
|
if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
|
|
continue;
|
|
|
|
cmd.opcode = MMC_SEND_CSD;
|
|
cmd.arg = card->rca << 16;
|
|
cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
|
|
|
|
err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
|
|
if (err != MMC_ERR_NONE) {
|
|
mmc_card_set_dead(card);
|
|
continue;
|
|
}
|
|
|
|
memcpy(card->raw_csd, cmd.resp, sizeof(card->raw_csd));
|
|
|
|
mmc_decode_csd(card);
|
|
mmc_decode_cid(card);
|
|
}
|
|
}
|
|
|
|
static void mmc_read_scrs(struct mmc_host *host)
|
|
{
|
|
int err;
|
|
struct mmc_card *card;
|
|
struct mmc_request mrq;
|
|
struct mmc_command cmd;
|
|
struct mmc_data data;
|
|
struct scatterlist sg;
|
|
|
|
list_for_each_entry(card, &host->cards, node) {
|
|
if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
|
|
continue;
|
|
if (!mmc_card_sd(card))
|
|
continue;
|
|
|
|
err = mmc_select_card(host, card);
|
|
if (err != MMC_ERR_NONE) {
|
|
mmc_card_set_dead(card);
|
|
continue;
|
|
}
|
|
|
|
memset(&cmd, 0, sizeof(struct mmc_command));
|
|
|
|
cmd.opcode = MMC_APP_CMD;
|
|
cmd.arg = card->rca << 16;
|
|
cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
|
|
|
|
err = mmc_wait_for_cmd(host, &cmd, 0);
|
|
if ((err != MMC_ERR_NONE) || !(cmd.resp[0] & R1_APP_CMD)) {
|
|
mmc_card_set_dead(card);
|
|
continue;
|
|
}
|
|
|
|
memset(&cmd, 0, sizeof(struct mmc_command));
|
|
|
|
cmd.opcode = SD_APP_SEND_SCR;
|
|
cmd.arg = 0;
|
|
cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
|
|
|
|
memset(&data, 0, sizeof(struct mmc_data));
|
|
|
|
mmc_set_data_timeout(&data, card, 0);
|
|
|
|
data.blksz_bits = 3;
|
|
data.blksz = 1 << 3;
|
|
data.blocks = 1;
|
|
data.flags = MMC_DATA_READ;
|
|
data.sg = &sg;
|
|
data.sg_len = 1;
|
|
|
|
memset(&mrq, 0, sizeof(struct mmc_request));
|
|
|
|
mrq.cmd = &cmd;
|
|
mrq.data = &data;
|
|
|
|
sg_init_one(&sg, (u8*)card->raw_scr, 8);
|
|
|
|
mmc_wait_for_req(host, &mrq);
|
|
|
|
if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) {
|
|
mmc_card_set_dead(card);
|
|
continue;
|
|
}
|
|
|
|
card->raw_scr[0] = ntohl(card->raw_scr[0]);
|
|
card->raw_scr[1] = ntohl(card->raw_scr[1]);
|
|
|
|
mmc_decode_scr(card);
|
|
}
|
|
|
|
mmc_deselect_cards(host);
|
|
}
|
|
|
|
static unsigned int mmc_calculate_clock(struct mmc_host *host)
|
|
{
|
|
struct mmc_card *card;
|
|
unsigned int max_dtr = host->f_max;
|
|
|
|
list_for_each_entry(card, &host->cards, node)
|
|
if (!mmc_card_dead(card) && max_dtr > card->csd.max_dtr)
|
|
max_dtr = card->csd.max_dtr;
|
|
|
|
pr_debug("%s: selected %d.%03dMHz transfer rate\n",
|
|
mmc_hostname(host),
|
|
max_dtr / 1000000, (max_dtr / 1000) % 1000);
|
|
|
|
return max_dtr;
|
|
}
|
|
|
|
/*
|
|
* Check whether cards we already know about are still present.
|
|
* We do this by requesting status, and checking whether a card
|
|
* responds.
|
|
*
|
|
* A request for status does not cause a state change in data
|
|
* transfer mode.
|
|
*/
|
|
static void mmc_check_cards(struct mmc_host *host)
|
|
{
|
|
struct list_head *l, *n;
|
|
|
|
mmc_deselect_cards(host);
|
|
|
|
list_for_each_safe(l, n, &host->cards) {
|
|
struct mmc_card *card = mmc_list_to_card(l);
|
|
struct mmc_command cmd;
|
|
int err;
|
|
|
|
cmd.opcode = MMC_SEND_STATUS;
|
|
cmd.arg = card->rca << 16;
|
|
cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
|
|
|
|
err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
|
|
if (err == MMC_ERR_NONE)
|
|
continue;
|
|
|
|
mmc_card_set_dead(card);
|
|
}
|
|
}
|
|
|
|
static void mmc_setup(struct mmc_host *host)
|
|
{
|
|
if (host->ios.power_mode != MMC_POWER_ON) {
|
|
int err;
|
|
u32 ocr;
|
|
|
|
host->mode = MMC_MODE_SD;
|
|
|
|
mmc_power_up(host);
|
|
mmc_idle_cards(host);
|
|
|
|
err = mmc_send_app_op_cond(host, 0, &ocr);
|
|
|
|
/*
|
|
* If we fail to detect any SD cards then try
|
|
* searching for MMC cards.
|
|
*/
|
|
if (err != MMC_ERR_NONE) {
|
|
host->mode = MMC_MODE_MMC;
|
|
|
|
err = mmc_send_op_cond(host, 0, &ocr);
|
|
if (err != MMC_ERR_NONE)
|
|
return;
|
|
}
|
|
|
|
host->ocr = mmc_select_voltage(host, ocr);
|
|
|
|
/*
|
|
* Since we're changing the OCR value, we seem to
|
|
* need to tell some cards to go back to the idle
|
|
* state. We wait 1ms to give cards time to
|
|
* respond.
|
|
*/
|
|
if (host->ocr)
|
|
mmc_idle_cards(host);
|
|
} else {
|
|
host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
|
|
host->ios.clock = host->f_min;
|
|
mmc_set_ios(host);
|
|
|
|
/*
|
|
* We should remember the OCR mask from the existing
|
|
* cards, and detect the new cards OCR mask, combine
|
|
* the two and re-select the VDD. However, if we do
|
|
* change VDD, we should do an idle, and then do a
|
|
* full re-initialisation. We would need to notify
|
|
* drivers so that they can re-setup the cards as
|
|
* well, while keeping their queues at bay.
|
|
*
|
|
* For the moment, we take the easy way out - if the
|
|
* new cards don't like our currently selected VDD,
|
|
* they drop off the bus.
|
|
*/
|
|
}
|
|
|
|
if (host->ocr == 0)
|
|
return;
|
|
|
|
/*
|
|
* Send the selected OCR multiple times... until the cards
|
|
* all get the idea that they should be ready for CMD2.
|
|
* (My SanDisk card seems to need this.)
|
|
*/
|
|
if (host->mode == MMC_MODE_SD)
|
|
mmc_send_app_op_cond(host, host->ocr, NULL);
|
|
else
|
|
mmc_send_op_cond(host, host->ocr, NULL);
|
|
|
|
mmc_discover_cards(host);
|
|
|
|
/*
|
|
* Ok, now switch to push-pull mode.
|
|
*/
|
|
host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
|
|
mmc_set_ios(host);
|
|
|
|
mmc_read_csds(host);
|
|
|
|
if (host->mode == MMC_MODE_SD)
|
|
mmc_read_scrs(host);
|
|
}
|
|
|
|
|
|
/**
|
|
* mmc_detect_change - process change of state on a MMC socket
|
|
* @host: host which changed state.
|
|
* @delay: optional delay to wait before detection (jiffies)
|
|
*
|
|
* All we know is that card(s) have been inserted or removed
|
|
* from the socket(s). We don't know which socket or cards.
|
|
*/
|
|
void mmc_detect_change(struct mmc_host *host, unsigned long delay)
|
|
{
|
|
if (delay)
|
|
schedule_delayed_work(&host->detect, delay);
|
|
else
|
|
schedule_work(&host->detect);
|
|
}
|
|
|
|
EXPORT_SYMBOL(mmc_detect_change);
|
|
|
|
|
|
static void mmc_rescan(void *data)
|
|
{
|
|
struct mmc_host *host = data;
|
|
struct list_head *l, *n;
|
|
|
|
mmc_claim_host(host);
|
|
|
|
if (host->ios.power_mode == MMC_POWER_ON)
|
|
mmc_check_cards(host);
|
|
|
|
mmc_setup(host);
|
|
|
|
if (!list_empty(&host->cards)) {
|
|
/*
|
|
* (Re-)calculate the fastest clock rate which the
|
|
* attached cards and the host support.
|
|
*/
|
|
host->ios.clock = mmc_calculate_clock(host);
|
|
mmc_set_ios(host);
|
|
}
|
|
|
|
mmc_release_host(host);
|
|
|
|
list_for_each_safe(l, n, &host->cards) {
|
|
struct mmc_card *card = mmc_list_to_card(l);
|
|
|
|
/*
|
|
* If this is a new and good card, register it.
|
|
*/
|
|
if (!mmc_card_present(card) && !mmc_card_dead(card)) {
|
|
if (mmc_register_card(card))
|
|
mmc_card_set_dead(card);
|
|
else
|
|
mmc_card_set_present(card);
|
|
}
|
|
|
|
/*
|
|
* If this card is dead, destroy it.
|
|
*/
|
|
if (mmc_card_dead(card)) {
|
|
list_del(&card->node);
|
|
mmc_remove_card(card);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If we discover that there are no cards on the
|
|
* bus, turn off the clock and power down.
|
|
*/
|
|
if (list_empty(&host->cards))
|
|
mmc_power_off(host);
|
|
}
|
|
|
|
|
|
/**
|
|
* mmc_alloc_host - initialise the per-host structure.
|
|
* @extra: sizeof private data structure
|
|
* @dev: pointer to host device model structure
|
|
*
|
|
* Initialise the per-host structure.
|
|
*/
|
|
struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
|
|
{
|
|
struct mmc_host *host;
|
|
|
|
host = mmc_alloc_host_sysfs(extra, dev);
|
|
if (host) {
|
|
spin_lock_init(&host->lock);
|
|
init_waitqueue_head(&host->wq);
|
|
INIT_LIST_HEAD(&host->cards);
|
|
INIT_WORK(&host->detect, mmc_rescan, host);
|
|
|
|
/*
|
|
* By default, hosts do not support SGIO or large requests.
|
|
* They have to set these according to their abilities.
|
|
*/
|
|
host->max_hw_segs = 1;
|
|
host->max_phys_segs = 1;
|
|
host->max_sectors = 1 << (PAGE_CACHE_SHIFT - 9);
|
|
host->max_seg_size = PAGE_CACHE_SIZE;
|
|
}
|
|
|
|
return host;
|
|
}
|
|
|
|
EXPORT_SYMBOL(mmc_alloc_host);
|
|
|
|
/**
|
|
* mmc_add_host - initialise host hardware
|
|
* @host: mmc host
|
|
*/
|
|
int mmc_add_host(struct mmc_host *host)
|
|
{
|
|
int ret;
|
|
|
|
ret = mmc_add_host_sysfs(host);
|
|
if (ret == 0) {
|
|
mmc_power_off(host);
|
|
mmc_detect_change(host, 0);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
EXPORT_SYMBOL(mmc_add_host);
|
|
|
|
/**
|
|
* mmc_remove_host - remove host hardware
|
|
* @host: mmc host
|
|
*
|
|
* Unregister and remove all cards associated with this host,
|
|
* and power down the MMC bus.
|
|
*/
|
|
void mmc_remove_host(struct mmc_host *host)
|
|
{
|
|
struct list_head *l, *n;
|
|
|
|
list_for_each_safe(l, n, &host->cards) {
|
|
struct mmc_card *card = mmc_list_to_card(l);
|
|
|
|
mmc_remove_card(card);
|
|
}
|
|
|
|
mmc_power_off(host);
|
|
mmc_remove_host_sysfs(host);
|
|
}
|
|
|
|
EXPORT_SYMBOL(mmc_remove_host);
|
|
|
|
/**
|
|
* mmc_free_host - free the host structure
|
|
* @host: mmc host
|
|
*
|
|
* Free the host once all references to it have been dropped.
|
|
*/
|
|
void mmc_free_host(struct mmc_host *host)
|
|
{
|
|
flush_scheduled_work();
|
|
mmc_free_host_sysfs(host);
|
|
}
|
|
|
|
EXPORT_SYMBOL(mmc_free_host);
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
/**
|
|
* mmc_suspend_host - suspend a host
|
|
* @host: mmc host
|
|
* @state: suspend mode (PM_SUSPEND_xxx)
|
|
*/
|
|
int mmc_suspend_host(struct mmc_host *host, pm_message_t state)
|
|
{
|
|
mmc_claim_host(host);
|
|
mmc_deselect_cards(host);
|
|
mmc_power_off(host);
|
|
mmc_release_host(host);
|
|
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(mmc_suspend_host);
|
|
|
|
/**
|
|
* mmc_resume_host - resume a previously suspended host
|
|
* @host: mmc host
|
|
*/
|
|
int mmc_resume_host(struct mmc_host *host)
|
|
{
|
|
mmc_rescan(host);
|
|
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(mmc_resume_host);
|
|
|
|
#endif
|
|
|
|
MODULE_LICENSE("GPL");
|