![Adrian Hunter](/assets/img/avatar_default.png)
mmc_request_done() is sometimes called from interrupt or other atomic context. Mostly all mmc_request_done() does is complete(), however it contains code to retry on error, which uses ->request(). As the error path is certainly not performance critical, this may be moved to the waiting function mmc_wait_for_req_done(). This allows ->request() to use runtime PM get_sync() and guarantee it is never in an atomic context. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Acked-by: Ulf Hansson <ulf.hansson@stericsson.com> Signed-off-by: Chris Ball <cjb@laptop.org>
2287 lines
54 KiB
C
2287 lines
54 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) 2005-2008 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 <linux/leds.h>
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#include <linux/scatterlist.h>
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#include <linux/log2.h>
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#include <linux/regulator/consumer.h>
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#include <linux/pm_runtime.h>
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#include <linux/suspend.h>
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#include <linux/fault-inject.h>
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#include <linux/random.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 "bus.h"
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#include "host.h"
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#include "sdio_bus.h"
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#include "mmc_ops.h"
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#include "sd_ops.h"
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#include "sdio_ops.h"
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static struct workqueue_struct *workqueue;
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/*
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* Enabling software CRCs on the data blocks can be a significant (30%)
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* performance cost, and for other reasons may not always be desired.
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* So we allow it it to be disabled.
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*/
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int use_spi_crc = 1;
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module_param(use_spi_crc, bool, 0);
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/*
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* We normally treat cards as removed during suspend if they are not
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* known to be on a non-removable bus, to avoid the risk of writing
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* back data to a different card after resume. Allow this to be
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* overridden if necessary.
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*/
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#ifdef CONFIG_MMC_UNSAFE_RESUME
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int mmc_assume_removable;
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#else
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int mmc_assume_removable = 1;
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#endif
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EXPORT_SYMBOL(mmc_assume_removable);
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module_param_named(removable, mmc_assume_removable, bool, 0644);
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MODULE_PARM_DESC(
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removable,
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"MMC/SD cards are removable and may be removed during suspend");
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/*
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* Internal function. Schedule delayed work in the MMC work queue.
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*/
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static int mmc_schedule_delayed_work(struct delayed_work *work,
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unsigned long delay)
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{
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return queue_delayed_work(workqueue, work, delay);
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}
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/*
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* Internal function. Flush all scheduled work from the MMC work queue.
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*/
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static void mmc_flush_scheduled_work(void)
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{
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flush_workqueue(workqueue);
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}
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#ifdef CONFIG_FAIL_MMC_REQUEST
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/*
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* Internal function. Inject random data errors.
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* If mmc_data is NULL no errors are injected.
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*/
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static void mmc_should_fail_request(struct mmc_host *host,
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struct mmc_request *mrq)
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{
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struct mmc_command *cmd = mrq->cmd;
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struct mmc_data *data = mrq->data;
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static const int data_errors[] = {
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-ETIMEDOUT,
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-EILSEQ,
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-EIO,
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};
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if (!data)
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return;
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if (cmd->error || data->error ||
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!should_fail(&host->fail_mmc_request, data->blksz * data->blocks))
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return;
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data->error = data_errors[random32() % ARRAY_SIZE(data_errors)];
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data->bytes_xfered = (random32() % (data->bytes_xfered >> 9)) << 9;
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}
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#else /* CONFIG_FAIL_MMC_REQUEST */
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static inline void mmc_should_fail_request(struct mmc_host *host,
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struct mmc_request *mrq)
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{
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}
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#endif /* CONFIG_FAIL_MMC_REQUEST */
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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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if (err && cmd->retries && mmc_host_is_spi(host)) {
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if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
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cmd->retries = 0;
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}
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if (err && cmd->retries) {
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/*
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* Request starter must handle retries - see
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* mmc_wait_for_req_done().
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*/
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if (mrq->done)
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mrq->done(mrq);
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} else {
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mmc_should_fail_request(host, mrq);
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led_trigger_event(host->led, LED_OFF);
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pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
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mmc_hostname(host), cmd->opcode, err,
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cmd->resp[0], cmd->resp[1],
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cmd->resp[2], cmd->resp[3]);
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if (mrq->data) {
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pr_debug("%s: %d bytes transferred: %d\n",
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mmc_hostname(host),
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mrq->data->bytes_xfered, mrq->data->error);
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}
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if (mrq->stop) {
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pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n",
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mmc_hostname(host), mrq->stop->opcode,
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mrq->stop->error,
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mrq->stop->resp[0], mrq->stop->resp[1],
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mrq->stop->resp[2], mrq->stop->resp[3]);
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}
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if (mrq->done)
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mrq->done(mrq);
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mmc_host_clk_release(host);
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}
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}
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EXPORT_SYMBOL(mmc_request_done);
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static 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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struct scatterlist *sg;
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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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if (mrq->data) {
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pr_debug("%s: blksz %d blocks %d flags %08x "
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"tsac %d ms nsac %d\n",
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mmc_hostname(host), mrq->data->blksz,
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mrq->data->blocks, mrq->data->flags,
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mrq->data->timeout_ns / 1000000,
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mrq->data->timeout_clks);
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}
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if (mrq->stop) {
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pr_debug("%s: CMD%u arg %08x flags %08x\n",
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mmc_hostname(host), mrq->stop->opcode,
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mrq->stop->arg, mrq->stop->flags);
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}
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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_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i)
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sz += sg->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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mmc_host_clk_hold(host);
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led_trigger_event(host->led, LED_FULL);
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host->ops->request(host, mrq);
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}
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static void mmc_wait_done(struct mmc_request *mrq)
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{
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complete(&mrq->completion);
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}
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static void __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq)
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{
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init_completion(&mrq->completion);
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mrq->done = mmc_wait_done;
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mmc_start_request(host, mrq);
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}
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static void mmc_wait_for_req_done(struct mmc_host *host,
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struct mmc_request *mrq)
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{
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struct mmc_command *cmd;
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while (1) {
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wait_for_completion(&mrq->completion);
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cmd = mrq->cmd;
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if (!cmd->error || !cmd->retries)
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break;
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pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
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mmc_hostname(host), cmd->opcode, cmd->error);
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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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}
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}
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/**
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* mmc_pre_req - Prepare for a new request
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* @host: MMC host to prepare command
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* @mrq: MMC request to prepare for
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* @is_first_req: true if there is no previous started request
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* that may run in parellel to this call, otherwise false
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*
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* mmc_pre_req() is called in prior to mmc_start_req() to let
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* host prepare for the new request. Preparation of a request may be
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* performed while another request is running on the host.
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*/
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static void mmc_pre_req(struct mmc_host *host, struct mmc_request *mrq,
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bool is_first_req)
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{
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if (host->ops->pre_req)
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host->ops->pre_req(host, mrq, is_first_req);
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}
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/**
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* mmc_post_req - Post process a completed request
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* @host: MMC host to post process command
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* @mrq: MMC request to post process for
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* @err: Error, if non zero, clean up any resources made in pre_req
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*
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* Let the host post process a completed request. Post processing of
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* a request may be performed while another reuqest is running.
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*/
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static void mmc_post_req(struct mmc_host *host, struct mmc_request *mrq,
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int err)
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{
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if (host->ops->post_req)
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host->ops->post_req(host, mrq, err);
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}
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/**
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* mmc_start_req - start a non-blocking request
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* @host: MMC host to start command
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* @areq: async request to start
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* @error: out parameter returns 0 for success, otherwise non zero
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*
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* Start a new MMC custom command request for a host.
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* If there is on ongoing async request wait for completion
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* of that request and start the new one and return.
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* Does not wait for the new request to complete.
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*
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* Returns the completed request, NULL in case of none completed.
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* Wait for the an ongoing request (previoulsy started) to complete and
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* return the completed request. If there is no ongoing request, NULL
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* is returned without waiting. NULL is not an error condition.
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*/
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struct mmc_async_req *mmc_start_req(struct mmc_host *host,
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struct mmc_async_req *areq, int *error)
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{
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int err = 0;
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struct mmc_async_req *data = host->areq;
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/* Prepare a new request */
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if (areq)
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mmc_pre_req(host, areq->mrq, !host->areq);
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if (host->areq) {
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mmc_wait_for_req_done(host, host->areq->mrq);
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err = host->areq->err_check(host->card, host->areq);
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if (err) {
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/* post process the completed failed request */
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mmc_post_req(host, host->areq->mrq, 0);
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if (areq)
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/*
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* Cancel the new prepared request, because
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* it can't run until the failed
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* request has been properly handled.
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*/
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mmc_post_req(host, areq->mrq, -EINVAL);
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host->areq = NULL;
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goto out;
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}
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}
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if (areq)
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__mmc_start_req(host, areq->mrq);
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if (host->areq)
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mmc_post_req(host, host->areq->mrq, 0);
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host->areq = areq;
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out:
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if (error)
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*error = err;
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return data;
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}
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EXPORT_SYMBOL(mmc_start_req);
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/**
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* mmc_wait_for_req - start a request and wait for completion
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* @host: MMC host to start command
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* @mrq: MMC request to start
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*
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* Start a new MMC custom command request for a host, and wait
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* for the command to complete. Does not attempt to parse the
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* response.
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*/
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void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
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{
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__mmc_start_req(host, mrq);
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mmc_wait_for_req_done(host, mrq);
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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 = {NULL};
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WARN_ON(!host->claimed);
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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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*
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* Computes the data timeout parameters according to the
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* correct algorithm given the card type.
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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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{
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unsigned int mult;
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/*
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* SDIO cards only define an upper 1 s limit on access.
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*/
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if (mmc_card_sdio(card)) {
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data->timeout_ns = 1000000000;
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data->timeout_clks = 0;
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return;
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}
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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 (data->flags & MMC_DATA_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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if (mmc_host_clk_rate(card->host))
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timeout_us += data->timeout_clks * 1000 /
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(mmc_host_clk_rate(card->host) / 1000);
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if (data->flags & MMC_DATA_WRITE)
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/*
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* The limit is really 250 ms, but that is
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* insufficient for some crappy cards.
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*/
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limit_us = 300000;
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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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* Some cards need very high timeouts if driven in SPI mode.
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* The worst observed timeout was 900ms after writing a
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* continuous stream of data until the internal logic
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* overflowed.
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*/
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if (mmc_host_is_spi(card->host)) {
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if (data->flags & MMC_DATA_WRITE) {
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if (data->timeout_ns < 1000000000)
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data->timeout_ns = 1000000000; /* 1s */
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} else {
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if (data->timeout_ns < 100000000)
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data->timeout_ns = 100000000; /* 100ms */
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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_align_data_size - pads a transfer size to a more optimal value
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* @card: the MMC card associated with the data transfer
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* @sz: original transfer size
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*
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* Pads the original data size with a number of extra bytes in
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* order to avoid controller bugs and/or performance hits
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* (e.g. some controllers revert to PIO for certain sizes).
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*
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* Returns the improved size, which might be unmodified.
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*
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* Note that this function is only relevant when issuing a
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* single scatter gather entry.
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*/
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unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz)
|
|
{
|
|
/*
|
|
* FIXME: We don't have a system for the controller to tell
|
|
* the core about its problems yet, so for now we just 32-bit
|
|
* align the size.
|
|
*/
|
|
sz = ((sz + 3) / 4) * 4;
|
|
|
|
return sz;
|
|
}
|
|
EXPORT_SYMBOL(mmc_align_data_size);
|
|
|
|
/**
|
|
* mmc_host_enable - enable a host.
|
|
* @host: mmc host to enable
|
|
*
|
|
* Hosts that support power saving can use the 'enable' and 'disable'
|
|
* methods to exit and enter power saving states. For more information
|
|
* see comments for struct mmc_host_ops.
|
|
*/
|
|
int mmc_host_enable(struct mmc_host *host)
|
|
{
|
|
if (!(host->caps & MMC_CAP_DISABLE))
|
|
return 0;
|
|
|
|
if (host->en_dis_recurs)
|
|
return 0;
|
|
|
|
if (host->nesting_cnt++)
|
|
return 0;
|
|
|
|
cancel_delayed_work_sync(&host->disable);
|
|
|
|
if (host->enabled)
|
|
return 0;
|
|
|
|
if (host->ops->enable) {
|
|
int err;
|
|
|
|
host->en_dis_recurs = 1;
|
|
err = host->ops->enable(host);
|
|
host->en_dis_recurs = 0;
|
|
|
|
if (err) {
|
|
pr_debug("%s: enable error %d\n",
|
|
mmc_hostname(host), err);
|
|
return err;
|
|
}
|
|
}
|
|
host->enabled = 1;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(mmc_host_enable);
|
|
|
|
static int mmc_host_do_disable(struct mmc_host *host, int lazy)
|
|
{
|
|
if (host->ops->disable) {
|
|
int err;
|
|
|
|
host->en_dis_recurs = 1;
|
|
err = host->ops->disable(host, lazy);
|
|
host->en_dis_recurs = 0;
|
|
|
|
if (err < 0) {
|
|
pr_debug("%s: disable error %d\n",
|
|
mmc_hostname(host), err);
|
|
return err;
|
|
}
|
|
if (err > 0) {
|
|
unsigned long delay = msecs_to_jiffies(err);
|
|
|
|
mmc_schedule_delayed_work(&host->disable, delay);
|
|
}
|
|
}
|
|
host->enabled = 0;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* mmc_host_disable - disable a host.
|
|
* @host: mmc host to disable
|
|
*
|
|
* Hosts that support power saving can use the 'enable' and 'disable'
|
|
* methods to exit and enter power saving states. For more information
|
|
* see comments for struct mmc_host_ops.
|
|
*/
|
|
int mmc_host_disable(struct mmc_host *host)
|
|
{
|
|
int err;
|
|
|
|
if (!(host->caps & MMC_CAP_DISABLE))
|
|
return 0;
|
|
|
|
if (host->en_dis_recurs)
|
|
return 0;
|
|
|
|
if (--host->nesting_cnt)
|
|
return 0;
|
|
|
|
if (!host->enabled)
|
|
return 0;
|
|
|
|
err = mmc_host_do_disable(host, 0);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(mmc_host_disable);
|
|
|
|
/**
|
|
* __mmc_claim_host - exclusively claim a host
|
|
* @host: mmc host to claim
|
|
* @abort: whether or not the operation should be aborted
|
|
*
|
|
* Claim a host for a set of operations. If @abort is non null and
|
|
* dereference a non-zero value then this will return prematurely with
|
|
* that non-zero value without acquiring the lock. Returns zero
|
|
* with the lock held otherwise.
|
|
*/
|
|
int __mmc_claim_host(struct mmc_host *host, atomic_t *abort)
|
|
{
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
unsigned long flags;
|
|
int stop;
|
|
|
|
might_sleep();
|
|
|
|
add_wait_queue(&host->wq, &wait);
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
while (1) {
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
stop = abort ? atomic_read(abort) : 0;
|
|
if (stop || !host->claimed || host->claimer == current)
|
|
break;
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
schedule();
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
}
|
|
set_current_state(TASK_RUNNING);
|
|
if (!stop) {
|
|
host->claimed = 1;
|
|
host->claimer = current;
|
|
host->claim_cnt += 1;
|
|
} else
|
|
wake_up(&host->wq);
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
remove_wait_queue(&host->wq, &wait);
|
|
if (!stop)
|
|
mmc_host_enable(host);
|
|
return stop;
|
|
}
|
|
|
|
EXPORT_SYMBOL(__mmc_claim_host);
|
|
|
|
/**
|
|
* mmc_try_claim_host - try exclusively to claim a host
|
|
* @host: mmc host to claim
|
|
*
|
|
* Returns %1 if the host is claimed, %0 otherwise.
|
|
*/
|
|
int mmc_try_claim_host(struct mmc_host *host)
|
|
{
|
|
int claimed_host = 0;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
if (!host->claimed || host->claimer == current) {
|
|
host->claimed = 1;
|
|
host->claimer = current;
|
|
host->claim_cnt += 1;
|
|
claimed_host = 1;
|
|
}
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
return claimed_host;
|
|
}
|
|
EXPORT_SYMBOL(mmc_try_claim_host);
|
|
|
|
/**
|
|
* mmc_do_release_host - release a claimed host
|
|
* @host: mmc host to release
|
|
*
|
|
* If you successfully claimed a host, this function will
|
|
* release it again.
|
|
*/
|
|
void mmc_do_release_host(struct mmc_host *host)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
if (--host->claim_cnt) {
|
|
/* Release for nested claim */
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
} else {
|
|
host->claimed = 0;
|
|
host->claimer = NULL;
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
wake_up(&host->wq);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(mmc_do_release_host);
|
|
|
|
void mmc_host_deeper_disable(struct work_struct *work)
|
|
{
|
|
struct mmc_host *host =
|
|
container_of(work, struct mmc_host, disable.work);
|
|
|
|
/* If the host is claimed then we do not want to disable it anymore */
|
|
if (!mmc_try_claim_host(host))
|
|
return;
|
|
mmc_host_do_disable(host, 1);
|
|
mmc_do_release_host(host);
|
|
}
|
|
|
|
/**
|
|
* mmc_host_lazy_disable - lazily disable a host.
|
|
* @host: mmc host to disable
|
|
*
|
|
* Hosts that support power saving can use the 'enable' and 'disable'
|
|
* methods to exit and enter power saving states. For more information
|
|
* see comments for struct mmc_host_ops.
|
|
*/
|
|
int mmc_host_lazy_disable(struct mmc_host *host)
|
|
{
|
|
if (!(host->caps & MMC_CAP_DISABLE))
|
|
return 0;
|
|
|
|
if (host->en_dis_recurs)
|
|
return 0;
|
|
|
|
if (--host->nesting_cnt)
|
|
return 0;
|
|
|
|
if (!host->enabled)
|
|
return 0;
|
|
|
|
if (host->disable_delay) {
|
|
mmc_schedule_delayed_work(&host->disable,
|
|
msecs_to_jiffies(host->disable_delay));
|
|
return 0;
|
|
} else
|
|
return mmc_host_do_disable(host, 1);
|
|
}
|
|
EXPORT_SYMBOL(mmc_host_lazy_disable);
|
|
|
|
/**
|
|
* mmc_release_host - release a host
|
|
* @host: mmc host to release
|
|
*
|
|
* Release a MMC host, allowing others to claim the host
|
|
* for their operations.
|
|
*/
|
|
void mmc_release_host(struct mmc_host *host)
|
|
{
|
|
WARN_ON(!host->claimed);
|
|
|
|
mmc_host_lazy_disable(host);
|
|
|
|
mmc_do_release_host(host);
|
|
}
|
|
|
|
EXPORT_SYMBOL(mmc_release_host);
|
|
|
|
/*
|
|
* Internal function that does the actual ios call to the host driver,
|
|
* optionally printing some debug output.
|
|
*/
|
|
static inline void mmc_set_ios(struct mmc_host *host)
|
|
{
|
|
struct mmc_ios *ios = &host->ios;
|
|
|
|
pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
|
|
"width %u timing %u\n",
|
|
mmc_hostname(host), ios->clock, ios->bus_mode,
|
|
ios->power_mode, ios->chip_select, ios->vdd,
|
|
ios->bus_width, ios->timing);
|
|
|
|
if (ios->clock > 0)
|
|
mmc_set_ungated(host);
|
|
host->ops->set_ios(host, ios);
|
|
}
|
|
|
|
/*
|
|
* Control chip select pin on a host.
|
|
*/
|
|
void mmc_set_chip_select(struct mmc_host *host, int mode)
|
|
{
|
|
mmc_host_clk_hold(host);
|
|
host->ios.chip_select = mode;
|
|
mmc_set_ios(host);
|
|
mmc_host_clk_release(host);
|
|
}
|
|
|
|
/*
|
|
* Sets the host clock to the highest possible frequency that
|
|
* is below "hz".
|
|
*/
|
|
static void __mmc_set_clock(struct mmc_host *host, unsigned int hz)
|
|
{
|
|
WARN_ON(hz < host->f_min);
|
|
|
|
if (hz > host->f_max)
|
|
hz = host->f_max;
|
|
|
|
host->ios.clock = hz;
|
|
mmc_set_ios(host);
|
|
}
|
|
|
|
void mmc_set_clock(struct mmc_host *host, unsigned int hz)
|
|
{
|
|
mmc_host_clk_hold(host);
|
|
__mmc_set_clock(host, hz);
|
|
mmc_host_clk_release(host);
|
|
}
|
|
|
|
#ifdef CONFIG_MMC_CLKGATE
|
|
/*
|
|
* This gates the clock by setting it to 0 Hz.
|
|
*/
|
|
void mmc_gate_clock(struct mmc_host *host)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&host->clk_lock, flags);
|
|
host->clk_old = host->ios.clock;
|
|
host->ios.clock = 0;
|
|
host->clk_gated = true;
|
|
spin_unlock_irqrestore(&host->clk_lock, flags);
|
|
mmc_set_ios(host);
|
|
}
|
|
|
|
/*
|
|
* This restores the clock from gating by using the cached
|
|
* clock value.
|
|
*/
|
|
void mmc_ungate_clock(struct mmc_host *host)
|
|
{
|
|
/*
|
|
* We should previously have gated the clock, so the clock shall
|
|
* be 0 here! The clock may however be 0 during initialization,
|
|
* when some request operations are performed before setting
|
|
* the frequency. When ungate is requested in that situation
|
|
* we just ignore the call.
|
|
*/
|
|
if (host->clk_old) {
|
|
BUG_ON(host->ios.clock);
|
|
/* This call will also set host->clk_gated to false */
|
|
__mmc_set_clock(host, host->clk_old);
|
|
}
|
|
}
|
|
|
|
void mmc_set_ungated(struct mmc_host *host)
|
|
{
|
|
unsigned long flags;
|
|
|
|
/*
|
|
* We've been given a new frequency while the clock is gated,
|
|
* so make sure we regard this as ungating it.
|
|
*/
|
|
spin_lock_irqsave(&host->clk_lock, flags);
|
|
host->clk_gated = false;
|
|
spin_unlock_irqrestore(&host->clk_lock, flags);
|
|
}
|
|
|
|
#else
|
|
void mmc_set_ungated(struct mmc_host *host)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Change the bus mode (open drain/push-pull) of a host.
|
|
*/
|
|
void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode)
|
|
{
|
|
mmc_host_clk_hold(host);
|
|
host->ios.bus_mode = mode;
|
|
mmc_set_ios(host);
|
|
mmc_host_clk_release(host);
|
|
}
|
|
|
|
/*
|
|
* Change data bus width of a host.
|
|
*/
|
|
void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
|
|
{
|
|
mmc_host_clk_hold(host);
|
|
host->ios.bus_width = width;
|
|
mmc_set_ios(host);
|
|
mmc_host_clk_release(host);
|
|
}
|
|
|
|
/**
|
|
* mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
|
|
* @vdd: voltage (mV)
|
|
* @low_bits: prefer low bits in boundary cases
|
|
*
|
|
* This function returns the OCR bit number according to the provided @vdd
|
|
* value. If conversion is not possible a negative errno value returned.
|
|
*
|
|
* Depending on the @low_bits flag the function prefers low or high OCR bits
|
|
* on boundary voltages. For example,
|
|
* with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
|
|
* with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
|
|
*
|
|
* Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
|
|
*/
|
|
static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits)
|
|
{
|
|
const int max_bit = ilog2(MMC_VDD_35_36);
|
|
int bit;
|
|
|
|
if (vdd < 1650 || vdd > 3600)
|
|
return -EINVAL;
|
|
|
|
if (vdd >= 1650 && vdd <= 1950)
|
|
return ilog2(MMC_VDD_165_195);
|
|
|
|
if (low_bits)
|
|
vdd -= 1;
|
|
|
|
/* Base 2000 mV, step 100 mV, bit's base 8. */
|
|
bit = (vdd - 2000) / 100 + 8;
|
|
if (bit > max_bit)
|
|
return max_bit;
|
|
return bit;
|
|
}
|
|
|
|
/**
|
|
* mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
|
|
* @vdd_min: minimum voltage value (mV)
|
|
* @vdd_max: maximum voltage value (mV)
|
|
*
|
|
* This function returns the OCR mask bits according to the provided @vdd_min
|
|
* and @vdd_max values. If conversion is not possible the function returns 0.
|
|
*
|
|
* Notes wrt boundary cases:
|
|
* This function sets the OCR bits for all boundary voltages, for example
|
|
* [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
|
|
* MMC_VDD_34_35 mask.
|
|
*/
|
|
u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max)
|
|
{
|
|
u32 mask = 0;
|
|
|
|
if (vdd_max < vdd_min)
|
|
return 0;
|
|
|
|
/* Prefer high bits for the boundary vdd_max values. */
|
|
vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false);
|
|
if (vdd_max < 0)
|
|
return 0;
|
|
|
|
/* Prefer low bits for the boundary vdd_min values. */
|
|
vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true);
|
|
if (vdd_min < 0)
|
|
return 0;
|
|
|
|
/* Fill the mask, from max bit to min bit. */
|
|
while (vdd_max >= vdd_min)
|
|
mask |= 1 << vdd_max--;
|
|
|
|
return mask;
|
|
}
|
|
EXPORT_SYMBOL(mmc_vddrange_to_ocrmask);
|
|
|
|
#ifdef CONFIG_REGULATOR
|
|
|
|
/**
|
|
* mmc_regulator_get_ocrmask - return mask of supported voltages
|
|
* @supply: regulator to use
|
|
*
|
|
* This returns either a negative errno, or a mask of voltages that
|
|
* can be provided to MMC/SD/SDIO devices using the specified voltage
|
|
* regulator. This would normally be called before registering the
|
|
* MMC host adapter.
|
|
*/
|
|
int mmc_regulator_get_ocrmask(struct regulator *supply)
|
|
{
|
|
int result = 0;
|
|
int count;
|
|
int i;
|
|
|
|
count = regulator_count_voltages(supply);
|
|
if (count < 0)
|
|
return count;
|
|
|
|
for (i = 0; i < count; i++) {
|
|
int vdd_uV;
|
|
int vdd_mV;
|
|
|
|
vdd_uV = regulator_list_voltage(supply, i);
|
|
if (vdd_uV <= 0)
|
|
continue;
|
|
|
|
vdd_mV = vdd_uV / 1000;
|
|
result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL(mmc_regulator_get_ocrmask);
|
|
|
|
/**
|
|
* mmc_regulator_set_ocr - set regulator to match host->ios voltage
|
|
* @mmc: the host to regulate
|
|
* @supply: regulator to use
|
|
* @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
|
|
*
|
|
* Returns zero on success, else negative errno.
|
|
*
|
|
* MMC host drivers may use this to enable or disable a regulator using
|
|
* a particular supply voltage. This would normally be called from the
|
|
* set_ios() method.
|
|
*/
|
|
int mmc_regulator_set_ocr(struct mmc_host *mmc,
|
|
struct regulator *supply,
|
|
unsigned short vdd_bit)
|
|
{
|
|
int result = 0;
|
|
int min_uV, max_uV;
|
|
|
|
if (vdd_bit) {
|
|
int tmp;
|
|
int voltage;
|
|
|
|
/* REVISIT mmc_vddrange_to_ocrmask() may have set some
|
|
* bits this regulator doesn't quite support ... don't
|
|
* be too picky, most cards and regulators are OK with
|
|
* a 0.1V range goof (it's a small error percentage).
|
|
*/
|
|
tmp = vdd_bit - ilog2(MMC_VDD_165_195);
|
|
if (tmp == 0) {
|
|
min_uV = 1650 * 1000;
|
|
max_uV = 1950 * 1000;
|
|
} else {
|
|
min_uV = 1900 * 1000 + tmp * 100 * 1000;
|
|
max_uV = min_uV + 100 * 1000;
|
|
}
|
|
|
|
/* avoid needless changes to this voltage; the regulator
|
|
* might not allow this operation
|
|
*/
|
|
voltage = regulator_get_voltage(supply);
|
|
if (voltage < 0)
|
|
result = voltage;
|
|
else if (voltage < min_uV || voltage > max_uV)
|
|
result = regulator_set_voltage(supply, min_uV, max_uV);
|
|
else
|
|
result = 0;
|
|
|
|
if (result == 0 && !mmc->regulator_enabled) {
|
|
result = regulator_enable(supply);
|
|
if (!result)
|
|
mmc->regulator_enabled = true;
|
|
}
|
|
} else if (mmc->regulator_enabled) {
|
|
result = regulator_disable(supply);
|
|
if (result == 0)
|
|
mmc->regulator_enabled = false;
|
|
}
|
|
|
|
if (result)
|
|
dev_err(mmc_dev(mmc),
|
|
"could not set regulator OCR (%d)\n", result);
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL(mmc_regulator_set_ocr);
|
|
|
|
#endif /* CONFIG_REGULATOR */
|
|
|
|
/*
|
|
* Mask off any voltages we don't support and select
|
|
* the lowest voltage
|
|
*/
|
|
u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
|
|
{
|
|
int bit;
|
|
|
|
ocr &= host->ocr_avail;
|
|
|
|
bit = ffs(ocr);
|
|
if (bit) {
|
|
bit -= 1;
|
|
|
|
ocr &= 3 << bit;
|
|
|
|
mmc_host_clk_hold(host);
|
|
host->ios.vdd = bit;
|
|
mmc_set_ios(host);
|
|
mmc_host_clk_release(host);
|
|
} else {
|
|
pr_warning("%s: host doesn't support card's voltages\n",
|
|
mmc_hostname(host));
|
|
ocr = 0;
|
|
}
|
|
|
|
return ocr;
|
|
}
|
|
|
|
int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage, bool cmd11)
|
|
{
|
|
struct mmc_command cmd = {0};
|
|
int err = 0;
|
|
|
|
BUG_ON(!host);
|
|
|
|
/*
|
|
* Send CMD11 only if the request is to switch the card to
|
|
* 1.8V signalling.
|
|
*/
|
|
if ((signal_voltage != MMC_SIGNAL_VOLTAGE_330) && cmd11) {
|
|
cmd.opcode = SD_SWITCH_VOLTAGE;
|
|
cmd.arg = 0;
|
|
cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
|
|
|
|
err = mmc_wait_for_cmd(host, &cmd, 0);
|
|
if (err)
|
|
return err;
|
|
|
|
if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR))
|
|
return -EIO;
|
|
}
|
|
|
|
host->ios.signal_voltage = signal_voltage;
|
|
|
|
if (host->ops->start_signal_voltage_switch)
|
|
err = host->ops->start_signal_voltage_switch(host, &host->ios);
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Select timing parameters for host.
|
|
*/
|
|
void mmc_set_timing(struct mmc_host *host, unsigned int timing)
|
|
{
|
|
mmc_host_clk_hold(host);
|
|
host->ios.timing = timing;
|
|
mmc_set_ios(host);
|
|
mmc_host_clk_release(host);
|
|
}
|
|
|
|
/*
|
|
* Select appropriate driver type for host.
|
|
*/
|
|
void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type)
|
|
{
|
|
mmc_host_clk_hold(host);
|
|
host->ios.drv_type = drv_type;
|
|
mmc_set_ios(host);
|
|
mmc_host_clk_release(host);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
|
|
mmc_host_clk_hold(host);
|
|
|
|
/* If ocr is set, we use it */
|
|
if (host->ocr)
|
|
bit = ffs(host->ocr) - 1;
|
|
else
|
|
bit = fls(host->ocr_avail) - 1;
|
|
|
|
host->ios.vdd = bit;
|
|
if (mmc_host_is_spi(host))
|
|
host->ios.chip_select = MMC_CS_HIGH;
|
|
else
|
|
host->ios.chip_select = MMC_CS_DONTCARE;
|
|
host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
|
|
host->ios.power_mode = MMC_POWER_UP;
|
|
host->ios.bus_width = MMC_BUS_WIDTH_1;
|
|
host->ios.timing = MMC_TIMING_LEGACY;
|
|
mmc_set_ios(host);
|
|
|
|
/*
|
|
* This delay should be sufficient to allow the power supply
|
|
* to reach the minimum voltage.
|
|
*/
|
|
mmc_delay(10);
|
|
|
|
host->ios.clock = host->f_init;
|
|
|
|
host->ios.power_mode = MMC_POWER_ON;
|
|
mmc_set_ios(host);
|
|
|
|
/*
|
|
* This delay must be at least 74 clock sizes, or 1 ms, or the
|
|
* time required to reach a stable voltage.
|
|
*/
|
|
mmc_delay(10);
|
|
|
|
mmc_host_clk_release(host);
|
|
}
|
|
|
|
void mmc_power_off(struct mmc_host *host)
|
|
{
|
|
mmc_host_clk_hold(host);
|
|
|
|
host->ios.clock = 0;
|
|
host->ios.vdd = 0;
|
|
|
|
/*
|
|
* Reset ocr mask to be the highest possible voltage supported for
|
|
* this mmc host. This value will be used at next power up.
|
|
*/
|
|
host->ocr = 1 << (fls(host->ocr_avail) - 1);
|
|
|
|
if (!mmc_host_is_spi(host)) {
|
|
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;
|
|
host->ios.timing = MMC_TIMING_LEGACY;
|
|
mmc_set_ios(host);
|
|
|
|
/*
|
|
* Some configurations, such as the 802.11 SDIO card in the OLPC
|
|
* XO-1.5, require a short delay after poweroff before the card
|
|
* can be successfully turned on again.
|
|
*/
|
|
mmc_delay(1);
|
|
|
|
mmc_host_clk_release(host);
|
|
}
|
|
|
|
/*
|
|
* Cleanup when the last reference to the bus operator is dropped.
|
|
*/
|
|
static void __mmc_release_bus(struct mmc_host *host)
|
|
{
|
|
BUG_ON(!host);
|
|
BUG_ON(host->bus_refs);
|
|
BUG_ON(!host->bus_dead);
|
|
|
|
host->bus_ops = NULL;
|
|
}
|
|
|
|
/*
|
|
* Increase reference count of bus operator
|
|
*/
|
|
static inline void mmc_bus_get(struct mmc_host *host)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
host->bus_refs++;
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
}
|
|
|
|
/*
|
|
* Decrease reference count of bus operator and free it if
|
|
* it is the last reference.
|
|
*/
|
|
static inline void mmc_bus_put(struct mmc_host *host)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
host->bus_refs--;
|
|
if ((host->bus_refs == 0) && host->bus_ops)
|
|
__mmc_release_bus(host);
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
}
|
|
|
|
/*
|
|
* Assign a mmc bus handler to a host. Only one bus handler may control a
|
|
* host at any given time.
|
|
*/
|
|
void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops)
|
|
{
|
|
unsigned long flags;
|
|
|
|
BUG_ON(!host);
|
|
BUG_ON(!ops);
|
|
|
|
WARN_ON(!host->claimed);
|
|
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
|
|
BUG_ON(host->bus_ops);
|
|
BUG_ON(host->bus_refs);
|
|
|
|
host->bus_ops = ops;
|
|
host->bus_refs = 1;
|
|
host->bus_dead = 0;
|
|
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
}
|
|
|
|
/*
|
|
* Remove the current bus handler from a host.
|
|
*/
|
|
void mmc_detach_bus(struct mmc_host *host)
|
|
{
|
|
unsigned long flags;
|
|
|
|
BUG_ON(!host);
|
|
|
|
WARN_ON(!host->claimed);
|
|
WARN_ON(!host->bus_ops);
|
|
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
|
|
host->bus_dead = 1;
|
|
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
|
|
mmc_bus_put(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)
|
|
*
|
|
* MMC drivers should call this when they detect a card has been
|
|
* inserted or removed. The MMC layer will confirm that any
|
|
* present card is still functional, and initialize any newly
|
|
* inserted.
|
|
*/
|
|
void mmc_detect_change(struct mmc_host *host, unsigned long delay)
|
|
{
|
|
#ifdef CONFIG_MMC_DEBUG
|
|
unsigned long flags;
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
WARN_ON(host->removed);
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
#endif
|
|
|
|
mmc_schedule_delayed_work(&host->detect, delay);
|
|
}
|
|
|
|
EXPORT_SYMBOL(mmc_detect_change);
|
|
|
|
void mmc_init_erase(struct mmc_card *card)
|
|
{
|
|
unsigned int sz;
|
|
|
|
if (is_power_of_2(card->erase_size))
|
|
card->erase_shift = ffs(card->erase_size) - 1;
|
|
else
|
|
card->erase_shift = 0;
|
|
|
|
/*
|
|
* It is possible to erase an arbitrarily large area of an SD or MMC
|
|
* card. That is not desirable because it can take a long time
|
|
* (minutes) potentially delaying more important I/O, and also the
|
|
* timeout calculations become increasingly hugely over-estimated.
|
|
* Consequently, 'pref_erase' is defined as a guide to limit erases
|
|
* to that size and alignment.
|
|
*
|
|
* For SD cards that define Allocation Unit size, limit erases to one
|
|
* Allocation Unit at a time. For MMC cards that define High Capacity
|
|
* Erase Size, whether it is switched on or not, limit to that size.
|
|
* Otherwise just have a stab at a good value. For modern cards it
|
|
* will end up being 4MiB. Note that if the value is too small, it
|
|
* can end up taking longer to erase.
|
|
*/
|
|
if (mmc_card_sd(card) && card->ssr.au) {
|
|
card->pref_erase = card->ssr.au;
|
|
card->erase_shift = ffs(card->ssr.au) - 1;
|
|
} else if (card->ext_csd.hc_erase_size) {
|
|
card->pref_erase = card->ext_csd.hc_erase_size;
|
|
} else {
|
|
sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11;
|
|
if (sz < 128)
|
|
card->pref_erase = 512 * 1024 / 512;
|
|
else if (sz < 512)
|
|
card->pref_erase = 1024 * 1024 / 512;
|
|
else if (sz < 1024)
|
|
card->pref_erase = 2 * 1024 * 1024 / 512;
|
|
else
|
|
card->pref_erase = 4 * 1024 * 1024 / 512;
|
|
if (card->pref_erase < card->erase_size)
|
|
card->pref_erase = card->erase_size;
|
|
else {
|
|
sz = card->pref_erase % card->erase_size;
|
|
if (sz)
|
|
card->pref_erase += card->erase_size - sz;
|
|
}
|
|
}
|
|
}
|
|
|
|
static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card,
|
|
unsigned int arg, unsigned int qty)
|
|
{
|
|
unsigned int erase_timeout;
|
|
|
|
if (card->ext_csd.erase_group_def & 1) {
|
|
/* High Capacity Erase Group Size uses HC timeouts */
|
|
if (arg == MMC_TRIM_ARG)
|
|
erase_timeout = card->ext_csd.trim_timeout;
|
|
else
|
|
erase_timeout = card->ext_csd.hc_erase_timeout;
|
|
} else {
|
|
/* CSD Erase Group Size uses write timeout */
|
|
unsigned int mult = (10 << card->csd.r2w_factor);
|
|
unsigned int timeout_clks = card->csd.tacc_clks * mult;
|
|
unsigned int timeout_us;
|
|
|
|
/* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */
|
|
if (card->csd.tacc_ns < 1000000)
|
|
timeout_us = (card->csd.tacc_ns * mult) / 1000;
|
|
else
|
|
timeout_us = (card->csd.tacc_ns / 1000) * mult;
|
|
|
|
/*
|
|
* ios.clock is only a target. The real clock rate might be
|
|
* less but not that much less, so fudge it by multiplying by 2.
|
|
*/
|
|
timeout_clks <<= 1;
|
|
timeout_us += (timeout_clks * 1000) /
|
|
(mmc_host_clk_rate(card->host) / 1000);
|
|
|
|
erase_timeout = timeout_us / 1000;
|
|
|
|
/*
|
|
* Theoretically, the calculation could underflow so round up
|
|
* to 1ms in that case.
|
|
*/
|
|
if (!erase_timeout)
|
|
erase_timeout = 1;
|
|
}
|
|
|
|
/* Multiplier for secure operations */
|
|
if (arg & MMC_SECURE_ARGS) {
|
|
if (arg == MMC_SECURE_ERASE_ARG)
|
|
erase_timeout *= card->ext_csd.sec_erase_mult;
|
|
else
|
|
erase_timeout *= card->ext_csd.sec_trim_mult;
|
|
}
|
|
|
|
erase_timeout *= qty;
|
|
|
|
/*
|
|
* Ensure at least a 1 second timeout for SPI as per
|
|
* 'mmc_set_data_timeout()'
|
|
*/
|
|
if (mmc_host_is_spi(card->host) && erase_timeout < 1000)
|
|
erase_timeout = 1000;
|
|
|
|
return erase_timeout;
|
|
}
|
|
|
|
static unsigned int mmc_sd_erase_timeout(struct mmc_card *card,
|
|
unsigned int arg,
|
|
unsigned int qty)
|
|
{
|
|
unsigned int erase_timeout;
|
|
|
|
if (card->ssr.erase_timeout) {
|
|
/* Erase timeout specified in SD Status Register (SSR) */
|
|
erase_timeout = card->ssr.erase_timeout * qty +
|
|
card->ssr.erase_offset;
|
|
} else {
|
|
/*
|
|
* Erase timeout not specified in SD Status Register (SSR) so
|
|
* use 250ms per write block.
|
|
*/
|
|
erase_timeout = 250 * qty;
|
|
}
|
|
|
|
/* Must not be less than 1 second */
|
|
if (erase_timeout < 1000)
|
|
erase_timeout = 1000;
|
|
|
|
return erase_timeout;
|
|
}
|
|
|
|
static unsigned int mmc_erase_timeout(struct mmc_card *card,
|
|
unsigned int arg,
|
|
unsigned int qty)
|
|
{
|
|
if (mmc_card_sd(card))
|
|
return mmc_sd_erase_timeout(card, arg, qty);
|
|
else
|
|
return mmc_mmc_erase_timeout(card, arg, qty);
|
|
}
|
|
|
|
static int mmc_do_erase(struct mmc_card *card, unsigned int from,
|
|
unsigned int to, unsigned int arg)
|
|
{
|
|
struct mmc_command cmd = {0};
|
|
unsigned int qty = 0;
|
|
int err;
|
|
|
|
/*
|
|
* qty is used to calculate the erase timeout which depends on how many
|
|
* erase groups (or allocation units in SD terminology) are affected.
|
|
* We count erasing part of an erase group as one erase group.
|
|
* For SD, the allocation units are always a power of 2. For MMC, the
|
|
* erase group size is almost certainly also power of 2, but it does not
|
|
* seem to insist on that in the JEDEC standard, so we fall back to
|
|
* division in that case. SD may not specify an allocation unit size,
|
|
* in which case the timeout is based on the number of write blocks.
|
|
*
|
|
* Note that the timeout for secure trim 2 will only be correct if the
|
|
* number of erase groups specified is the same as the total of all
|
|
* preceding secure trim 1 commands. Since the power may have been
|
|
* lost since the secure trim 1 commands occurred, it is generally
|
|
* impossible to calculate the secure trim 2 timeout correctly.
|
|
*/
|
|
if (card->erase_shift)
|
|
qty += ((to >> card->erase_shift) -
|
|
(from >> card->erase_shift)) + 1;
|
|
else if (mmc_card_sd(card))
|
|
qty += to - from + 1;
|
|
else
|
|
qty += ((to / card->erase_size) -
|
|
(from / card->erase_size)) + 1;
|
|
|
|
if (!mmc_card_blockaddr(card)) {
|
|
from <<= 9;
|
|
to <<= 9;
|
|
}
|
|
|
|
if (mmc_card_sd(card))
|
|
cmd.opcode = SD_ERASE_WR_BLK_START;
|
|
else
|
|
cmd.opcode = MMC_ERASE_GROUP_START;
|
|
cmd.arg = from;
|
|
cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
|
|
err = mmc_wait_for_cmd(card->host, &cmd, 0);
|
|
if (err) {
|
|
printk(KERN_ERR "mmc_erase: group start error %d, "
|
|
"status %#x\n", err, cmd.resp[0]);
|
|
err = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
memset(&cmd, 0, sizeof(struct mmc_command));
|
|
if (mmc_card_sd(card))
|
|
cmd.opcode = SD_ERASE_WR_BLK_END;
|
|
else
|
|
cmd.opcode = MMC_ERASE_GROUP_END;
|
|
cmd.arg = to;
|
|
cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
|
|
err = mmc_wait_for_cmd(card->host, &cmd, 0);
|
|
if (err) {
|
|
printk(KERN_ERR "mmc_erase: group end error %d, status %#x\n",
|
|
err, cmd.resp[0]);
|
|
err = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
memset(&cmd, 0, sizeof(struct mmc_command));
|
|
cmd.opcode = MMC_ERASE;
|
|
cmd.arg = arg;
|
|
cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
|
|
cmd.cmd_timeout_ms = mmc_erase_timeout(card, arg, qty);
|
|
err = mmc_wait_for_cmd(card->host, &cmd, 0);
|
|
if (err) {
|
|
printk(KERN_ERR "mmc_erase: erase error %d, status %#x\n",
|
|
err, cmd.resp[0]);
|
|
err = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
if (mmc_host_is_spi(card->host))
|
|
goto out;
|
|
|
|
do {
|
|
memset(&cmd, 0, sizeof(struct mmc_command));
|
|
cmd.opcode = MMC_SEND_STATUS;
|
|
cmd.arg = card->rca << 16;
|
|
cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
|
|
/* Do not retry else we can't see errors */
|
|
err = mmc_wait_for_cmd(card->host, &cmd, 0);
|
|
if (err || (cmd.resp[0] & 0xFDF92000)) {
|
|
printk(KERN_ERR "error %d requesting status %#x\n",
|
|
err, cmd.resp[0]);
|
|
err = -EIO;
|
|
goto out;
|
|
}
|
|
} while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
|
|
R1_CURRENT_STATE(cmd.resp[0]) == R1_STATE_PRG);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* mmc_erase - erase sectors.
|
|
* @card: card to erase
|
|
* @from: first sector to erase
|
|
* @nr: number of sectors to erase
|
|
* @arg: erase command argument (SD supports only %MMC_ERASE_ARG)
|
|
*
|
|
* Caller must claim host before calling this function.
|
|
*/
|
|
int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
|
|
unsigned int arg)
|
|
{
|
|
unsigned int rem, to = from + nr;
|
|
|
|
if (!(card->host->caps & MMC_CAP_ERASE) ||
|
|
!(card->csd.cmdclass & CCC_ERASE))
|
|
return -EOPNOTSUPP;
|
|
|
|
if (!card->erase_size)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (mmc_card_sd(card) && arg != MMC_ERASE_ARG)
|
|
return -EOPNOTSUPP;
|
|
|
|
if ((arg & MMC_SECURE_ARGS) &&
|
|
!(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN))
|
|
return -EOPNOTSUPP;
|
|
|
|
if ((arg & MMC_TRIM_ARGS) &&
|
|
!(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN))
|
|
return -EOPNOTSUPP;
|
|
|
|
if (arg == MMC_SECURE_ERASE_ARG) {
|
|
if (from % card->erase_size || nr % card->erase_size)
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (arg == MMC_ERASE_ARG) {
|
|
rem = from % card->erase_size;
|
|
if (rem) {
|
|
rem = card->erase_size - rem;
|
|
from += rem;
|
|
if (nr > rem)
|
|
nr -= rem;
|
|
else
|
|
return 0;
|
|
}
|
|
rem = nr % card->erase_size;
|
|
if (rem)
|
|
nr -= rem;
|
|
}
|
|
|
|
if (nr == 0)
|
|
return 0;
|
|
|
|
to = from + nr;
|
|
|
|
if (to <= from)
|
|
return -EINVAL;
|
|
|
|
/* 'from' and 'to' are inclusive */
|
|
to -= 1;
|
|
|
|
return mmc_do_erase(card, from, to, arg);
|
|
}
|
|
EXPORT_SYMBOL(mmc_erase);
|
|
|
|
int mmc_can_erase(struct mmc_card *card)
|
|
{
|
|
if ((card->host->caps & MMC_CAP_ERASE) &&
|
|
(card->csd.cmdclass & CCC_ERASE) && card->erase_size)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(mmc_can_erase);
|
|
|
|
int mmc_can_trim(struct mmc_card *card)
|
|
{
|
|
if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(mmc_can_trim);
|
|
|
|
int mmc_can_secure_erase_trim(struct mmc_card *card)
|
|
{
|
|
if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(mmc_can_secure_erase_trim);
|
|
|
|
int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
|
|
unsigned int nr)
|
|
{
|
|
if (!card->erase_size)
|
|
return 0;
|
|
if (from % card->erase_size || nr % card->erase_size)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
EXPORT_SYMBOL(mmc_erase_group_aligned);
|
|
|
|
static unsigned int mmc_do_calc_max_discard(struct mmc_card *card,
|
|
unsigned int arg)
|
|
{
|
|
struct mmc_host *host = card->host;
|
|
unsigned int max_discard, x, y, qty = 0, max_qty, timeout;
|
|
unsigned int last_timeout = 0;
|
|
|
|
if (card->erase_shift)
|
|
max_qty = UINT_MAX >> card->erase_shift;
|
|
else if (mmc_card_sd(card))
|
|
max_qty = UINT_MAX;
|
|
else
|
|
max_qty = UINT_MAX / card->erase_size;
|
|
|
|
/* Find the largest qty with an OK timeout */
|
|
do {
|
|
y = 0;
|
|
for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) {
|
|
timeout = mmc_erase_timeout(card, arg, qty + x);
|
|
if (timeout > host->max_discard_to)
|
|
break;
|
|
if (timeout < last_timeout)
|
|
break;
|
|
last_timeout = timeout;
|
|
y = x;
|
|
}
|
|
qty += y;
|
|
} while (y);
|
|
|
|
if (!qty)
|
|
return 0;
|
|
|
|
if (qty == 1)
|
|
return 1;
|
|
|
|
/* Convert qty to sectors */
|
|
if (card->erase_shift)
|
|
max_discard = --qty << card->erase_shift;
|
|
else if (mmc_card_sd(card))
|
|
max_discard = qty;
|
|
else
|
|
max_discard = --qty * card->erase_size;
|
|
|
|
return max_discard;
|
|
}
|
|
|
|
unsigned int mmc_calc_max_discard(struct mmc_card *card)
|
|
{
|
|
struct mmc_host *host = card->host;
|
|
unsigned int max_discard, max_trim;
|
|
|
|
if (!host->max_discard_to)
|
|
return UINT_MAX;
|
|
|
|
/*
|
|
* Without erase_group_def set, MMC erase timeout depends on clock
|
|
* frequence which can change. In that case, the best choice is
|
|
* just the preferred erase size.
|
|
*/
|
|
if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1))
|
|
return card->pref_erase;
|
|
|
|
max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG);
|
|
if (mmc_can_trim(card)) {
|
|
max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG);
|
|
if (max_trim < max_discard)
|
|
max_discard = max_trim;
|
|
} else if (max_discard < card->erase_size) {
|
|
max_discard = 0;
|
|
}
|
|
pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n",
|
|
mmc_hostname(host), max_discard, host->max_discard_to);
|
|
return max_discard;
|
|
}
|
|
EXPORT_SYMBOL(mmc_calc_max_discard);
|
|
|
|
int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen)
|
|
{
|
|
struct mmc_command cmd = {0};
|
|
|
|
if (mmc_card_blockaddr(card) || mmc_card_ddr_mode(card))
|
|
return 0;
|
|
|
|
cmd.opcode = MMC_SET_BLOCKLEN;
|
|
cmd.arg = blocklen;
|
|
cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
|
|
return mmc_wait_for_cmd(card->host, &cmd, 5);
|
|
}
|
|
EXPORT_SYMBOL(mmc_set_blocklen);
|
|
|
|
static void mmc_hw_reset_for_init(struct mmc_host *host)
|
|
{
|
|
if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
|
|
return;
|
|
mmc_host_clk_hold(host);
|
|
host->ops->hw_reset(host);
|
|
mmc_host_clk_release(host);
|
|
}
|
|
|
|
int mmc_can_reset(struct mmc_card *card)
|
|
{
|
|
u8 rst_n_function;
|
|
|
|
if (!mmc_card_mmc(card))
|
|
return 0;
|
|
rst_n_function = card->ext_csd.rst_n_function;
|
|
if ((rst_n_function & EXT_CSD_RST_N_EN_MASK) != EXT_CSD_RST_N_ENABLED)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
EXPORT_SYMBOL(mmc_can_reset);
|
|
|
|
static int mmc_do_hw_reset(struct mmc_host *host, int check)
|
|
{
|
|
struct mmc_card *card = host->card;
|
|
|
|
if (!host->bus_ops->power_restore)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (!card)
|
|
return -EINVAL;
|
|
|
|
if (!mmc_can_reset(card))
|
|
return -EOPNOTSUPP;
|
|
|
|
mmc_host_clk_hold(host);
|
|
mmc_set_clock(host, host->f_init);
|
|
|
|
host->ops->hw_reset(host);
|
|
|
|
/* If the reset has happened, then a status command will fail */
|
|
if (check) {
|
|
struct mmc_command cmd = {0};
|
|
int err;
|
|
|
|
cmd.opcode = MMC_SEND_STATUS;
|
|
if (!mmc_host_is_spi(card->host))
|
|
cmd.arg = card->rca << 16;
|
|
cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
|
|
err = mmc_wait_for_cmd(card->host, &cmd, 0);
|
|
if (!err) {
|
|
mmc_host_clk_release(host);
|
|
return -ENOSYS;
|
|
}
|
|
}
|
|
|
|
host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_DDR);
|
|
if (mmc_host_is_spi(host)) {
|
|
host->ios.chip_select = MMC_CS_HIGH;
|
|
host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
|
|
} else {
|
|
host->ios.chip_select = MMC_CS_DONTCARE;
|
|
host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
|
|
}
|
|
host->ios.bus_width = MMC_BUS_WIDTH_1;
|
|
host->ios.timing = MMC_TIMING_LEGACY;
|
|
mmc_set_ios(host);
|
|
|
|
mmc_host_clk_release(host);
|
|
|
|
return host->bus_ops->power_restore(host);
|
|
}
|
|
|
|
int mmc_hw_reset(struct mmc_host *host)
|
|
{
|
|
return mmc_do_hw_reset(host, 0);
|
|
}
|
|
EXPORT_SYMBOL(mmc_hw_reset);
|
|
|
|
int mmc_hw_reset_check(struct mmc_host *host)
|
|
{
|
|
return mmc_do_hw_reset(host, 1);
|
|
}
|
|
EXPORT_SYMBOL(mmc_hw_reset_check);
|
|
|
|
static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
|
|
{
|
|
host->f_init = freq;
|
|
|
|
#ifdef CONFIG_MMC_DEBUG
|
|
pr_info("%s: %s: trying to init card at %u Hz\n",
|
|
mmc_hostname(host), __func__, host->f_init);
|
|
#endif
|
|
mmc_power_up(host);
|
|
|
|
/*
|
|
* Some eMMCs (with VCCQ always on) may not be reset after power up, so
|
|
* do a hardware reset if possible.
|
|
*/
|
|
mmc_hw_reset_for_init(host);
|
|
|
|
/*
|
|
* sdio_reset sends CMD52 to reset card. Since we do not know
|
|
* if the card is being re-initialized, just send it. CMD52
|
|
* should be ignored by SD/eMMC cards.
|
|
*/
|
|
sdio_reset(host);
|
|
mmc_go_idle(host);
|
|
|
|
mmc_send_if_cond(host, host->ocr_avail);
|
|
|
|
/* Order's important: probe SDIO, then SD, then MMC */
|
|
if (!mmc_attach_sdio(host))
|
|
return 0;
|
|
if (!mmc_attach_sd(host))
|
|
return 0;
|
|
if (!mmc_attach_mmc(host))
|
|
return 0;
|
|
|
|
mmc_power_off(host);
|
|
return -EIO;
|
|
}
|
|
|
|
void mmc_rescan(struct work_struct *work)
|
|
{
|
|
static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
|
|
struct mmc_host *host =
|
|
container_of(work, struct mmc_host, detect.work);
|
|
int i;
|
|
|
|
if (host->rescan_disable)
|
|
return;
|
|
|
|
mmc_bus_get(host);
|
|
|
|
/*
|
|
* if there is a _removable_ card registered, check whether it is
|
|
* still present
|
|
*/
|
|
if (host->bus_ops && host->bus_ops->detect && !host->bus_dead
|
|
&& !(host->caps & MMC_CAP_NONREMOVABLE))
|
|
host->bus_ops->detect(host);
|
|
|
|
/*
|
|
* Let mmc_bus_put() free the bus/bus_ops if we've found that
|
|
* the card is no longer present.
|
|
*/
|
|
mmc_bus_put(host);
|
|
mmc_bus_get(host);
|
|
|
|
/* if there still is a card present, stop here */
|
|
if (host->bus_ops != NULL) {
|
|
mmc_bus_put(host);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Only we can add a new handler, so it's safe to
|
|
* release the lock here.
|
|
*/
|
|
mmc_bus_put(host);
|
|
|
|
if (host->ops->get_cd && host->ops->get_cd(host) == 0)
|
|
goto out;
|
|
|
|
mmc_claim_host(host);
|
|
for (i = 0; i < ARRAY_SIZE(freqs); i++) {
|
|
if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min)))
|
|
break;
|
|
if (freqs[i] <= host->f_min)
|
|
break;
|
|
}
|
|
mmc_release_host(host);
|
|
|
|
out:
|
|
if (host->caps & MMC_CAP_NEEDS_POLL)
|
|
mmc_schedule_delayed_work(&host->detect, HZ);
|
|
}
|
|
|
|
void mmc_start_host(struct mmc_host *host)
|
|
{
|
|
mmc_power_off(host);
|
|
mmc_detect_change(host, 0);
|
|
}
|
|
|
|
void mmc_stop_host(struct mmc_host *host)
|
|
{
|
|
#ifdef CONFIG_MMC_DEBUG
|
|
unsigned long flags;
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
host->removed = 1;
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
#endif
|
|
|
|
if (host->caps & MMC_CAP_DISABLE)
|
|
cancel_delayed_work(&host->disable);
|
|
cancel_delayed_work_sync(&host->detect);
|
|
mmc_flush_scheduled_work();
|
|
|
|
/* clear pm flags now and let card drivers set them as needed */
|
|
host->pm_flags = 0;
|
|
|
|
mmc_bus_get(host);
|
|
if (host->bus_ops && !host->bus_dead) {
|
|
if (host->bus_ops->remove)
|
|
host->bus_ops->remove(host);
|
|
|
|
mmc_claim_host(host);
|
|
mmc_detach_bus(host);
|
|
mmc_power_off(host);
|
|
mmc_release_host(host);
|
|
mmc_bus_put(host);
|
|
return;
|
|
}
|
|
mmc_bus_put(host);
|
|
|
|
BUG_ON(host->card);
|
|
|
|
mmc_power_off(host);
|
|
}
|
|
|
|
int mmc_power_save_host(struct mmc_host *host)
|
|
{
|
|
int ret = 0;
|
|
|
|
#ifdef CONFIG_MMC_DEBUG
|
|
pr_info("%s: %s: powering down\n", mmc_hostname(host), __func__);
|
|
#endif
|
|
|
|
mmc_bus_get(host);
|
|
|
|
if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) {
|
|
mmc_bus_put(host);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (host->bus_ops->power_save)
|
|
ret = host->bus_ops->power_save(host);
|
|
|
|
mmc_bus_put(host);
|
|
|
|
mmc_power_off(host);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(mmc_power_save_host);
|
|
|
|
int mmc_power_restore_host(struct mmc_host *host)
|
|
{
|
|
int ret;
|
|
|
|
#ifdef CONFIG_MMC_DEBUG
|
|
pr_info("%s: %s: powering up\n", mmc_hostname(host), __func__);
|
|
#endif
|
|
|
|
mmc_bus_get(host);
|
|
|
|
if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) {
|
|
mmc_bus_put(host);
|
|
return -EINVAL;
|
|
}
|
|
|
|
mmc_power_up(host);
|
|
ret = host->bus_ops->power_restore(host);
|
|
|
|
mmc_bus_put(host);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(mmc_power_restore_host);
|
|
|
|
int mmc_card_awake(struct mmc_host *host)
|
|
{
|
|
int err = -ENOSYS;
|
|
|
|
mmc_bus_get(host);
|
|
|
|
if (host->bus_ops && !host->bus_dead && host->bus_ops->awake)
|
|
err = host->bus_ops->awake(host);
|
|
|
|
mmc_bus_put(host);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(mmc_card_awake);
|
|
|
|
int mmc_card_sleep(struct mmc_host *host)
|
|
{
|
|
int err = -ENOSYS;
|
|
|
|
mmc_bus_get(host);
|
|
|
|
if (host->bus_ops && !host->bus_dead && host->bus_ops->awake)
|
|
err = host->bus_ops->sleep(host);
|
|
|
|
mmc_bus_put(host);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(mmc_card_sleep);
|
|
|
|
int mmc_card_can_sleep(struct mmc_host *host)
|
|
{
|
|
struct mmc_card *card = host->card;
|
|
|
|
if (card && mmc_card_mmc(card) && card->ext_csd.rev >= 3)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(mmc_card_can_sleep);
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
/**
|
|
* mmc_suspend_host - suspend a host
|
|
* @host: mmc host
|
|
*/
|
|
int mmc_suspend_host(struct mmc_host *host)
|
|
{
|
|
int err = 0;
|
|
|
|
if (host->caps & MMC_CAP_DISABLE)
|
|
cancel_delayed_work(&host->disable);
|
|
cancel_delayed_work(&host->detect);
|
|
mmc_flush_scheduled_work();
|
|
|
|
mmc_bus_get(host);
|
|
if (host->bus_ops && !host->bus_dead) {
|
|
if (host->bus_ops->suspend)
|
|
err = host->bus_ops->suspend(host);
|
|
if (err == -ENOSYS || !host->bus_ops->resume) {
|
|
/*
|
|
* We simply "remove" the card in this case.
|
|
* It will be redetected on resume.
|
|
*/
|
|
if (host->bus_ops->remove)
|
|
host->bus_ops->remove(host);
|
|
mmc_claim_host(host);
|
|
mmc_detach_bus(host);
|
|
mmc_power_off(host);
|
|
mmc_release_host(host);
|
|
host->pm_flags = 0;
|
|
err = 0;
|
|
}
|
|
}
|
|
mmc_bus_put(host);
|
|
|
|
if (!err && !mmc_card_keep_power(host))
|
|
mmc_power_off(host);
|
|
|
|
return err;
|
|
}
|
|
|
|
EXPORT_SYMBOL(mmc_suspend_host);
|
|
|
|
/**
|
|
* mmc_resume_host - resume a previously suspended host
|
|
* @host: mmc host
|
|
*/
|
|
int mmc_resume_host(struct mmc_host *host)
|
|
{
|
|
int err = 0;
|
|
|
|
mmc_bus_get(host);
|
|
if (host->bus_ops && !host->bus_dead) {
|
|
if (!mmc_card_keep_power(host)) {
|
|
mmc_power_up(host);
|
|
mmc_select_voltage(host, host->ocr);
|
|
/*
|
|
* Tell runtime PM core we just powered up the card,
|
|
* since it still believes the card is powered off.
|
|
* Note that currently runtime PM is only enabled
|
|
* for SDIO cards that are MMC_CAP_POWER_OFF_CARD
|
|
*/
|
|
if (mmc_card_sdio(host->card) &&
|
|
(host->caps & MMC_CAP_POWER_OFF_CARD)) {
|
|
pm_runtime_disable(&host->card->dev);
|
|
pm_runtime_set_active(&host->card->dev);
|
|
pm_runtime_enable(&host->card->dev);
|
|
}
|
|
}
|
|
BUG_ON(!host->bus_ops->resume);
|
|
err = host->bus_ops->resume(host);
|
|
if (err) {
|
|
printk(KERN_WARNING "%s: error %d during resume "
|
|
"(card was removed?)\n",
|
|
mmc_hostname(host), err);
|
|
err = 0;
|
|
}
|
|
}
|
|
host->pm_flags &= ~MMC_PM_KEEP_POWER;
|
|
mmc_bus_put(host);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(mmc_resume_host);
|
|
|
|
/* Do the card removal on suspend if card is assumed removeable
|
|
* Do that in pm notifier while userspace isn't yet frozen, so we will be able
|
|
to sync the card.
|
|
*/
|
|
int mmc_pm_notify(struct notifier_block *notify_block,
|
|
unsigned long mode, void *unused)
|
|
{
|
|
struct mmc_host *host = container_of(
|
|
notify_block, struct mmc_host, pm_notify);
|
|
unsigned long flags;
|
|
|
|
|
|
switch (mode) {
|
|
case PM_HIBERNATION_PREPARE:
|
|
case PM_SUSPEND_PREPARE:
|
|
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
host->rescan_disable = 1;
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
cancel_delayed_work_sync(&host->detect);
|
|
|
|
if (!host->bus_ops || host->bus_ops->suspend)
|
|
break;
|
|
|
|
mmc_claim_host(host);
|
|
|
|
if (host->bus_ops->remove)
|
|
host->bus_ops->remove(host);
|
|
|
|
mmc_detach_bus(host);
|
|
mmc_power_off(host);
|
|
mmc_release_host(host);
|
|
host->pm_flags = 0;
|
|
break;
|
|
|
|
case PM_POST_SUSPEND:
|
|
case PM_POST_HIBERNATION:
|
|
case PM_POST_RESTORE:
|
|
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
host->rescan_disable = 0;
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
mmc_detect_change(host, 0);
|
|
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int __init mmc_init(void)
|
|
{
|
|
int ret;
|
|
|
|
workqueue = alloc_ordered_workqueue("kmmcd", 0);
|
|
if (!workqueue)
|
|
return -ENOMEM;
|
|
|
|
ret = mmc_register_bus();
|
|
if (ret)
|
|
goto destroy_workqueue;
|
|
|
|
ret = mmc_register_host_class();
|
|
if (ret)
|
|
goto unregister_bus;
|
|
|
|
ret = sdio_register_bus();
|
|
if (ret)
|
|
goto unregister_host_class;
|
|
|
|
return 0;
|
|
|
|
unregister_host_class:
|
|
mmc_unregister_host_class();
|
|
unregister_bus:
|
|
mmc_unregister_bus();
|
|
destroy_workqueue:
|
|
destroy_workqueue(workqueue);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __exit mmc_exit(void)
|
|
{
|
|
sdio_unregister_bus();
|
|
mmc_unregister_host_class();
|
|
mmc_unregister_bus();
|
|
destroy_workqueue(workqueue);
|
|
}
|
|
|
|
subsys_initcall(mmc_init);
|
|
module_exit(mmc_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|