![Pierre Ossman](/assets/img/avatar_default.png)
Move basic host class device handling to its own file for clarity. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
642 lines
14 KiB
C
642 lines
14 KiB
C
/*
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* linux/drivers/mmc/core/core.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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* Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
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* MMCv4 support Copyright (C) 2006 Philip Langdale, 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/mmc.h>
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#include <linux/mmc/sd.h>
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#include "core.h"
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#include "sysfs.h"
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#include "mmc_ops.h"
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#include "sd_ops.h"
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extern int mmc_attach_mmc(struct mmc_host *host, u32 ocr);
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extern int mmc_attach_sd(struct mmc_host *host, u32 ocr);
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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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#ifdef CONFIG_MMC_DEBUG
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unsigned int i, sz;
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#endif
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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->claimed);
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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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BUG_ON(mrq->data->blksz > host->max_blk_size);
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BUG_ON(mrq->data->blocks > host->max_blk_count);
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BUG_ON(mrq->data->blocks * mrq->data->blksz >
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host->max_req_size);
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#ifdef CONFIG_MMC_DEBUG
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sz = 0;
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for (i = 0;i < mrq->data->sg_len;i++)
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sz += mrq->data->sg[i].length;
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BUG_ON(sz != mrq->data->blocks * mrq->data->blksz);
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#endif
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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->claimed);
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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_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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/*
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* SDHC cards always use these fixed values.
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*/
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if (timeout_us > limit_us || mmc_card_blockaddr(card)) {
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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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/**
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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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void mmc_claim_host(struct mmc_host *host)
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{
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DECLARE_WAITQUEUE(wait, current);
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unsigned long flags;
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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->claimed)
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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->claimed = 1;
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spin_unlock_irqrestore(&host->lock, flags);
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remove_wait_queue(&host->wq, &wait);
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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->claimed);
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spin_lock_irqsave(&host->lock, flags);
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host->claimed = 0;
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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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/*
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* Internal function that does the actual ios call to the host driver,
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* optionally printing some debug output.
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*/
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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 "
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"width %u timing %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, ios->timing);
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host->ops->set_ios(host, ios);
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}
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/*
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* Control chip select pin on a host.
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*/
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void mmc_set_chip_select(struct mmc_host *host, int mode)
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{
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host->ios.chip_select = mode;
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mmc_set_ios(host);
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}
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/*
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* Sets the host clock to the highest possible frequency that
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* is below "hz".
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*/
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void mmc_set_clock(struct mmc_host *host, unsigned int hz)
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{
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WARN_ON(hz < host->f_min);
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if (hz > host->f_max)
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hz = host->f_max;
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host->ios.clock = hz;
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mmc_set_ios(host);
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}
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/*
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* Change the bus mode (open drain/push-pull) of a host.
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*/
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void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode)
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{
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host->ios.bus_mode = mode;
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mmc_set_ios(host);
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}
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/*
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* Change data bus width of a host.
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*/
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void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
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{
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host->ios.bus_width = width;
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mmc_set_ios(host);
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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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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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/*
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* Select timing parameters for host.
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*/
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void mmc_set_timing(struct mmc_host *host, unsigned int timing)
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{
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host->ios.timing = timing;
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mmc_set_ios(host);
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}
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/*
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* Apply power to the MMC stack. This is a two-stage process.
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* First, we enable power to the card without the clock running.
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* We then wait a bit for the power to stabilise. Finally,
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* enable the bus drivers and clock to the card.
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*
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* We must _NOT_ enable the clock prior to power stablising.
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*
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* If a host does all the power sequencing itself, ignore the
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* initial MMC_POWER_UP stage.
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*/
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static void mmc_power_up(struct mmc_host *host)
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{
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int bit = fls(host->ocr_avail) - 1;
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host->ios.vdd = bit;
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host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
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host->ios.chip_select = MMC_CS_DONTCARE;
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host->ios.power_mode = MMC_POWER_UP;
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host->ios.bus_width = MMC_BUS_WIDTH_1;
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host->ios.timing = MMC_TIMING_LEGACY;
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mmc_set_ios(host);
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mmc_delay(1);
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host->ios.clock = host->f_min;
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host->ios.power_mode = MMC_POWER_ON;
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mmc_set_ios(host);
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mmc_delay(2);
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}
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static void mmc_power_off(struct mmc_host *host)
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{
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host->ios.clock = 0;
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host->ios.vdd = 0;
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host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
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host->ios.chip_select = MMC_CS_DONTCARE;
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host->ios.power_mode = MMC_POWER_OFF;
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host->ios.bus_width = MMC_BUS_WIDTH_1;
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host->ios.timing = MMC_TIMING_LEGACY;
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mmc_set_ios(host);
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}
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/*
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* Assign a mmc bus handler to a host. Only one bus handler may control a
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* host at any given time.
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*/
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void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops)
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{
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unsigned long flags;
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BUG_ON(!host);
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BUG_ON(!ops);
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BUG_ON(!host->claimed);
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spin_lock_irqsave(&host->lock, flags);
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BUG_ON(host->bus_ops);
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BUG_ON(host->bus_refs);
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host->bus_ops = ops;
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host->bus_refs = 1;
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host->bus_dead = 0;
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spin_unlock_irqrestore(&host->lock, flags);
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}
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/*
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* Remove the current bus handler from a host. Assumes that there are
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* no interesting cards left, so the bus is powered down.
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*/
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void mmc_detach_bus(struct mmc_host *host)
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{
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unsigned long flags;
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BUG_ON(!host);
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BUG_ON(!host->claimed);
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BUG_ON(!host->bus_ops);
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spin_lock_irqsave(&host->lock, flags);
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host->bus_dead = 1;
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spin_unlock_irqrestore(&host->lock, flags);
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mmc_power_off(host);
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mmc_bus_put(host);
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}
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/*
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* Cleanup when the last reference to the bus operator is dropped.
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*/
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void __mmc_release_bus(struct mmc_host *host)
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{
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BUG_ON(!host);
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BUG_ON(host->bus_refs);
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BUG_ON(!host->bus_dead);
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host->bus_ops = NULL;
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}
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/**
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* mmc_detect_change - process change of state on a MMC socket
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* @host: host which changed state.
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* @delay: optional delay to wait before detection (jiffies)
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*
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* All we know is that card(s) have been inserted or removed
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* from the socket(s). We don't know which socket or cards.
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*/
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void mmc_detect_change(struct mmc_host *host, unsigned long delay)
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{
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#ifdef CONFIG_MMC_DEBUG
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unsigned long flags;
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spin_lock_irqsave(&host->lock, flags);
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BUG_ON(host->removed);
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spin_unlock_irqrestore(&host->lock, flags);
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#endif
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mmc_schedule_delayed_work(&host->detect, delay);
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}
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EXPORT_SYMBOL(mmc_detect_change);
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void mmc_rescan(struct work_struct *work)
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{
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struct mmc_host *host =
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container_of(work, struct mmc_host, detect.work);
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u32 ocr;
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int err;
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mmc_bus_get(host);
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if (host->bus_ops == NULL) {
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/*
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* Only we can add a new handler, so it's safe to
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* release the lock here.
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*/
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mmc_bus_put(host);
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mmc_claim_host(host);
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mmc_power_up(host);
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mmc_go_idle(host);
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mmc_send_if_cond(host, host->ocr_avail);
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err = mmc_send_app_op_cond(host, 0, &ocr);
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if (err == MMC_ERR_NONE) {
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if (mmc_attach_sd(host, ocr))
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mmc_power_off(host);
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} else {
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/*
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* If we fail to detect any SD cards then try
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* searching for MMC cards.
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*/
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err = mmc_send_op_cond(host, 0, &ocr);
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if (err == MMC_ERR_NONE) {
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if (mmc_attach_mmc(host, ocr))
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mmc_power_off(host);
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} else {
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mmc_power_off(host);
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mmc_release_host(host);
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}
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}
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} else {
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if (host->bus_ops->detect && !host->bus_dead)
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host->bus_ops->detect(host);
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mmc_bus_put(host);
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}
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}
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void mmc_start_host(struct mmc_host *host)
|
|
{
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|
mmc_power_off(host);
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|
mmc_detect_change(host, 0);
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|
}
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|
|
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void mmc_stop_host(struct mmc_host *host)
|
|
{
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|
#ifdef CONFIG_MMC_DEBUG
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|
unsigned long flags;
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|
spin_lock_irqsave(&host->lock, flags);
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|
host->removed = 1;
|
|
spin_unlock_irqrestore(&host->lock, flags);
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|
#endif
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|
|
|
mmc_flush_scheduled_work();
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|
|
|
mmc_bus_get(host);
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|
if (host->bus_ops && !host->bus_dead) {
|
|
if (host->bus_ops->remove)
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|
host->bus_ops->remove(host);
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|
|
|
mmc_claim_host(host);
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|
mmc_detach_bus(host);
|
|
mmc_release_host(host);
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|
}
|
|
mmc_bus_put(host);
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|
|
|
BUG_ON(host->card);
|
|
|
|
mmc_power_off(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_flush_scheduled_work();
|
|
|
|
mmc_bus_get(host);
|
|
if (host->bus_ops && !host->bus_dead) {
|
|
if (host->bus_ops->suspend)
|
|
host->bus_ops->suspend(host);
|
|
if (!host->bus_ops->resume) {
|
|
if (host->bus_ops->remove)
|
|
host->bus_ops->remove(host);
|
|
|
|
mmc_claim_host(host);
|
|
mmc_detach_bus(host);
|
|
mmc_release_host(host);
|
|
}
|
|
}
|
|
mmc_bus_put(host);
|
|
|
|
mmc_power_off(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_bus_get(host);
|
|
if (host->bus_ops && !host->bus_dead) {
|
|
mmc_power_up(host);
|
|
BUG_ON(!host->bus_ops->resume);
|
|
host->bus_ops->resume(host);
|
|
}
|
|
mmc_bus_put(host);
|
|
|
|
/*
|
|
* We add a slight delay here so that resume can progress
|
|
* in parallel.
|
|
*/
|
|
mmc_detect_change(host, 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(mmc_resume_host);
|
|
|
|
#endif
|
|
|
|
MODULE_LICENSE("GPL");
|