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1073 lines
28 KiB
1073 lines
28 KiB
/*
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* linux/drivers/mmc/core/host.c
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*
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* Copyright (C) 2003 Russell King, All Rights Reserved.
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* Copyright (C) 2007-2008 Pierre Ossman
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* Copyright (C) 2010 Linus Walleij
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* Copyright (c) 2012, The Linux Foundation. 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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* MMC host class device management
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*/
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/idr.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/pagemap.h>
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#include <linux/export.h>
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#include <linux/leds.h>
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#include <linux/slab.h>
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#include <linux/mmc/host.h>
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#include <linux/mmc/card.h>
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#include <linux/mmc/ring_buffer.h>
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#include <linux/mmc/slot-gpio.h>
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#include "core.h"
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#include "crypto.h"
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#include "host.h"
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#include "slot-gpio.h"
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#include "pwrseq.h"
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#include "sdio_ops.h"
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#define MMC_DEVFRQ_DEFAULT_UP_THRESHOLD 35
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#define MMC_DEVFRQ_DEFAULT_DOWN_THRESHOLD 5
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#define MMC_DEVFRQ_DEFAULT_POLLING_MSEC 100
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static DEFINE_IDA(mmc_host_ida);
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static void mmc_host_classdev_release(struct device *dev)
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{
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struct mmc_host *host = cls_dev_to_mmc_host(dev);
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ida_simple_remove(&mmc_host_ida, host->index);
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kfree(host);
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}
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static int mmc_host_prepare(struct device *dev)
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{
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/*
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* Since mmc_host is a virtual device, we don't have to do anything.
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* If we return a positive value, the pm framework will consider that
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* the runtime suspend and system suspend of this device is same and
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* will set direct_complete flag as true. We don't want this as the
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* mmc_host always has positive disable_depth and setting the flag
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* will not speed up the suspend process.
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* So return 0.
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*/
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return 0;
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}
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static const struct dev_pm_ops mmc_pm_ops = {
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.prepare = mmc_host_prepare,
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};
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static struct class mmc_host_class = {
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.name = "mmc_host",
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.dev_release = mmc_host_classdev_release,
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.pm = &mmc_pm_ops,
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};
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int mmc_register_host_class(void)
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{
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return class_register(&mmc_host_class);
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}
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void mmc_unregister_host_class(void)
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{
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class_unregister(&mmc_host_class);
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}
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#ifdef CONFIG_MMC_CLKGATE
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static ssize_t clkgate_delay_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mmc_host *host = cls_dev_to_mmc_host(dev);
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return snprintf(buf, PAGE_SIZE, "%lu\n", host->clkgate_delay);
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}
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static ssize_t clkgate_delay_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct mmc_host *host = cls_dev_to_mmc_host(dev);
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unsigned long flags, value;
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if (kstrtoul(buf, 0, &value))
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return -EINVAL;
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spin_lock_irqsave(&host->clk_lock, flags);
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host->clkgate_delay = value;
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spin_unlock_irqrestore(&host->clk_lock, flags);
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return count;
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}
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/*
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* Enabling clock gating will make the core call out to the host
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* once up and once down when it performs a request or card operation
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* intermingled in any fashion. The driver will see this through
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* set_ios() operations with ios.clock field set to 0 to gate (disable)
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* the block clock, and to the old frequency to enable it again.
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*/
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static void mmc_host_clk_gate_delayed(struct mmc_host *host)
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{
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unsigned long tick_ns;
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unsigned long freq = host->ios.clock;
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unsigned long flags;
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if (!freq) {
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pr_debug("%s: frequency set to 0 in disable function, this means the clock is already disabled.\n",
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mmc_hostname(host));
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return;
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}
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/*
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* New requests may have appeared while we were scheduling,
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* then there is no reason to delay the check before
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* clk_disable().
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*/
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spin_lock_irqsave(&host->clk_lock, flags);
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/*
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* Delay n bus cycles (at least 8 from MMC spec) before attempting
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* to disable the MCI block clock. The reference count may have
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* gone up again after this delay due to rescheduling!
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*/
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if (!host->clk_requests) {
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spin_unlock_irqrestore(&host->clk_lock, flags);
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tick_ns = DIV_ROUND_UP(1000000000, freq);
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ndelay(host->clk_delay * tick_ns);
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} else {
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/* New users appeared while waiting for this work */
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spin_unlock_irqrestore(&host->clk_lock, flags);
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return;
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}
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mutex_lock(&host->clk_gate_mutex);
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spin_lock_irqsave(&host->clk_lock, flags);
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if (!host->clk_requests) {
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spin_unlock_irqrestore(&host->clk_lock, flags);
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/* This will set host->ios.clock to 0 */
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mmc_gate_clock(host);
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spin_lock_irqsave(&host->clk_lock, flags);
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pr_debug("%s: gated MCI clock\n", mmc_hostname(host));
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MMC_TRACE(host, "clocks are gated\n");
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}
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spin_unlock_irqrestore(&host->clk_lock, flags);
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mutex_unlock(&host->clk_gate_mutex);
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}
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/*
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* Internal work. Work to disable the clock at some later point.
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*/
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static void mmc_host_clk_gate_work(struct work_struct *work)
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{
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struct mmc_host *host = container_of(work, struct mmc_host,
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clk_gate_work.work);
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mmc_host_clk_gate_delayed(host);
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}
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/**
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* mmc_host_clk_hold - ungate hardware MCI clocks
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* @host: host to ungate.
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*
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* Makes sure the host ios.clock is restored to a non-zero value
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* past this call. Increase clock reference count and ungate clock
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* if we're the first user.
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*/
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void mmc_host_clk_hold(struct mmc_host *host)
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{
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unsigned long flags;
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/* cancel any clock gating work scheduled by mmc_host_clk_release() */
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cancel_delayed_work_sync(&host->clk_gate_work);
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mutex_lock(&host->clk_gate_mutex);
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spin_lock_irqsave(&host->clk_lock, flags);
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if (host->clk_gated) {
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spin_unlock_irqrestore(&host->clk_lock, flags);
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mmc_ungate_clock(host);
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spin_lock_irqsave(&host->clk_lock, flags);
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pr_debug("%s: ungated MCI clock\n", mmc_hostname(host));
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MMC_TRACE(host, "clocks are ungated\n");
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}
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host->clk_requests++;
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spin_unlock_irqrestore(&host->clk_lock, flags);
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mutex_unlock(&host->clk_gate_mutex);
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}
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EXPORT_SYMBOL(mmc_host_clk_hold);
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/**
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* mmc_host_may_gate_card - check if this card may be gated
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* @card: card to check.
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*/
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bool mmc_host_may_gate_card(struct mmc_card *card)
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{
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/* If there is no card we may gate it */
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if (!card)
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return true;
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/*
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* SDIO3.0 card allows the clock to be gated off so check if
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* that is the case or not.
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*/
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if (mmc_card_sdio(card) && card->cccr.async_intr_sup)
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return true;
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/*
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* Don't gate SDIO cards! These need to be clocked at all times
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* since they may be independent systems generating interrupts
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* and other events. The clock requests counter from the core will
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* go down to zero since the core does not need it, but we will not
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* gate the clock, because there is somebody out there that may still
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* be using it.
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*/
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return !(card->quirks & MMC_QUIRK_BROKEN_CLK_GATING);
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}
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/**
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* mmc_host_clk_release - gate off hardware MCI clocks
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* @host: host to gate.
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*
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* Calls the host driver with ios.clock set to zero as often as possible
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* in order to gate off hardware MCI clocks. Decrease clock reference
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* count and schedule disabling of clock.
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*/
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void mmc_host_clk_release(struct mmc_host *host)
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{
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unsigned long flags;
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spin_lock_irqsave(&host->clk_lock, flags);
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host->clk_requests--;
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if (mmc_host_may_gate_card(host->card) &&
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!host->clk_requests)
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queue_delayed_work(host->clk_gate_wq, &host->clk_gate_work,
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msecs_to_jiffies(host->clkgate_delay));
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spin_unlock_irqrestore(&host->clk_lock, flags);
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}
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EXPORT_SYMBOL(mmc_host_clk_release);
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/**
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* mmc_host_clk_rate - get current clock frequency setting
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* @host: host to get the clock frequency for.
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*
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* Returns current clock frequency regardless of gating.
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*/
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unsigned int mmc_host_clk_rate(struct mmc_host *host)
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{
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unsigned long freq;
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unsigned long flags;
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spin_lock_irqsave(&host->clk_lock, flags);
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if (host->clk_gated)
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freq = host->clk_old;
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else
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freq = host->ios.clock;
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spin_unlock_irqrestore(&host->clk_lock, flags);
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return freq;
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}
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/**
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* mmc_host_clk_init - set up clock gating code
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* @host: host with potential clock to control
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*/
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static inline void mmc_host_clk_init(struct mmc_host *host)
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{
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host->clk_requests = 0;
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/* Hold MCI clock for 8 cycles by default */
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host->clk_delay = 8;
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/*
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* Default clock gating delay is 0ms to avoid wasting power.
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* This value can be tuned by writing into sysfs entry.
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*/
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host->clkgate_delay = 0;
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host->clk_gated = false;
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INIT_DELAYED_WORK(&host->clk_gate_work, mmc_host_clk_gate_work);
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spin_lock_init(&host->clk_lock);
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mutex_init(&host->clk_gate_mutex);
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}
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/**
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* mmc_host_clk_exit - shut down clock gating code
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* @host: host with potential clock to control
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*/
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static inline void mmc_host_clk_exit(struct mmc_host *host)
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{
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/*
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* Wait for any outstanding gate and then make sure we're
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* ungated before exiting.
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*/
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if (cancel_delayed_work_sync(&host->clk_gate_work))
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mmc_host_clk_gate_delayed(host);
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if (host->clk_gated)
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mmc_host_clk_hold(host);
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if (host->clk_gate_wq)
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destroy_workqueue(host->clk_gate_wq);
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/* There should be only one user now */
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WARN_ON(host->clk_requests > 1);
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}
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static inline void mmc_host_clk_sysfs_init(struct mmc_host *host)
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{
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host->clkgate_delay_attr.show = clkgate_delay_show;
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host->clkgate_delay_attr.store = clkgate_delay_store;
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sysfs_attr_init(&host->clkgate_delay_attr.attr);
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host->clkgate_delay_attr.attr.name = "clkgate_delay";
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host->clkgate_delay_attr.attr.mode = 0644;
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if (device_create_file(&host->class_dev, &host->clkgate_delay_attr))
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pr_err("%s: Failed to create clkgate_delay sysfs entry\n",
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mmc_hostname(host));
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}
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static inline bool mmc_host_clk_gate_wq_init(struct mmc_host *host)
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{
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char *wq = NULL;
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int wq_nl;
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bool ret = true;
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wq_nl = sizeof("mmc_clk_gate/") + sizeof(mmc_hostname(host)) + 1;
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wq = kzalloc(wq_nl, GFP_KERNEL);
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if (!wq) {
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ret = false;
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goto out;
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}
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snprintf(wq, wq_nl, "mmc_clk_gate/%s", mmc_hostname(host));
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|
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/*
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* Create a work queue with flag WQ_MEM_RECLAIM set for
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* mmc clock gate work. Because mmc thread is created with
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* flag PF_MEMALLOC set, kernel will check for work queue
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* flag WQ_MEM_RECLAIM when flush the work queue. If work
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* queue flag WQ_MEM_RECLAIM is not set, kernel warning
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* will be triggered.
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*/
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host->clk_gate_wq = create_workqueue(wq);
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if (!host->clk_gate_wq) {
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ret = false;
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dev_err(host->parent,
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"failed to create clock gate work queue\n");
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}
|
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kfree(wq);
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out:
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return ret;
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}
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#else
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|
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static inline void mmc_host_clk_init(struct mmc_host *host)
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{
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}
|
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|
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static inline void mmc_host_clk_exit(struct mmc_host *host)
|
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{
|
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}
|
|
|
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static inline void mmc_host_clk_sysfs_init(struct mmc_host *host)
|
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{
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}
|
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|
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bool mmc_host_may_gate_card(struct mmc_card *card)
|
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{
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return false;
|
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}
|
|
|
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static inline bool mmc_host_clk_gate_wq_init(struct mmc_host *host)
|
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{
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return true;
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}
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#endif
|
|
|
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void mmc_retune_enable(struct mmc_host *host)
|
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{
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host->can_retune = 1;
|
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if (host->retune_period)
|
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mod_timer(&host->retune_timer,
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jiffies + host->retune_period * HZ);
|
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}
|
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EXPORT_SYMBOL(mmc_retune_enable);
|
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|
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/*
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* Pause re-tuning for a small set of operations. The pause begins after the
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* next command and after first doing re-tuning.
|
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*/
|
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void mmc_retune_pause(struct mmc_host *host)
|
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{
|
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if (!host->retune_paused) {
|
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host->retune_paused = 1;
|
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mmc_retune_needed(host);
|
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mmc_retune_hold(host);
|
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}
|
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}
|
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EXPORT_SYMBOL(mmc_retune_pause);
|
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|
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void mmc_retune_unpause(struct mmc_host *host)
|
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{
|
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if (host->retune_paused) {
|
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host->retune_paused = 0;
|
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mmc_retune_release(host);
|
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}
|
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}
|
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EXPORT_SYMBOL(mmc_retune_unpause);
|
|
|
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void mmc_retune_disable(struct mmc_host *host)
|
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{
|
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mmc_retune_unpause(host);
|
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host->can_retune = 0;
|
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del_timer_sync(&host->retune_timer);
|
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host->retune_now = 0;
|
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host->need_retune = 0;
|
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}
|
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EXPORT_SYMBOL(mmc_retune_disable);
|
|
|
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void mmc_retune_timer_stop(struct mmc_host *host)
|
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{
|
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del_timer_sync(&host->retune_timer);
|
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}
|
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EXPORT_SYMBOL(mmc_retune_timer_stop);
|
|
|
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void mmc_retune_hold(struct mmc_host *host)
|
|
{
|
|
if (!host->hold_retune)
|
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host->retune_now = 1;
|
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host->hold_retune += 1;
|
|
}
|
|
|
|
void mmc_retune_hold_now(struct mmc_host *host)
|
|
{
|
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host->retune_now = 0;
|
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host->hold_retune += 1;
|
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}
|
|
|
|
void mmc_retune_release(struct mmc_host *host)
|
|
{
|
|
if (host->hold_retune)
|
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host->hold_retune -= 1;
|
|
else
|
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WARN_ON(1);
|
|
}
|
|
|
|
int mmc_retune(struct mmc_host *host)
|
|
{
|
|
bool return_to_hs400 = false;
|
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int err;
|
|
|
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if (host->retune_now)
|
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host->retune_now = 0;
|
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else
|
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return 0;
|
|
|
|
if (!host->need_retune || host->doing_retune || !host->card ||
|
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mmc_card_hs400es(host->card))
|
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return 0;
|
|
|
|
host->need_retune = 0;
|
|
|
|
host->doing_retune = 1;
|
|
|
|
if (host->ios.timing == MMC_TIMING_MMC_HS400) {
|
|
err = mmc_hs400_to_hs200(host->card);
|
|
if (err)
|
|
goto out;
|
|
|
|
return_to_hs400 = true;
|
|
|
|
if (host->ops->prepare_hs400_tuning)
|
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host->ops->prepare_hs400_tuning(host, &host->ios);
|
|
}
|
|
|
|
/*
|
|
* Timing should be adjusted to the HS400 target
|
|
* operation frequency for tuning process.
|
|
* Similar handling is also done in mmc_hs200_tuning()
|
|
* This is handled properly in sdhci-msm.c from msm-5.4 onwards.
|
|
*/
|
|
if (host->card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
|
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host->ios.bus_width == MMC_BUS_WIDTH_8)
|
|
mmc_set_timing(host, MMC_TIMING_MMC_HS400);
|
|
|
|
err = mmc_execute_tuning(host->card);
|
|
if (err)
|
|
goto out;
|
|
|
|
if (return_to_hs400)
|
|
err = mmc_hs200_to_hs400(host->card);
|
|
out:
|
|
host->doing_retune = 0;
|
|
|
|
return err;
|
|
}
|
|
|
|
static void mmc_retune_timer(unsigned long data)
|
|
{
|
|
struct mmc_host *host = (struct mmc_host *)data;
|
|
|
|
mmc_retune_needed(host);
|
|
}
|
|
|
|
/**
|
|
* mmc_of_parse() - parse host's device-tree node
|
|
* @host: host whose node should be parsed.
|
|
*
|
|
* To keep the rest of the MMC subsystem unaware of whether DT has been
|
|
* used to to instantiate and configure this host instance or not, we
|
|
* parse the properties and set respective generic mmc-host flags and
|
|
* parameters.
|
|
*/
|
|
int mmc_of_parse(struct mmc_host *host)
|
|
{
|
|
struct device *dev = host->parent;
|
|
u32 bus_width;
|
|
int ret;
|
|
bool cd_cap_invert, cd_gpio_invert = false;
|
|
bool ro_cap_invert, ro_gpio_invert = false;
|
|
|
|
if (!dev || !dev_fwnode(dev))
|
|
return 0;
|
|
|
|
/* "bus-width" is translated to MMC_CAP_*_BIT_DATA flags */
|
|
if (device_property_read_u32(dev, "bus-width", &bus_width) < 0) {
|
|
dev_dbg(host->parent,
|
|
"\"bus-width\" property is missing, assuming 1 bit.\n");
|
|
bus_width = 1;
|
|
}
|
|
|
|
switch (bus_width) {
|
|
case 8:
|
|
host->caps |= MMC_CAP_8_BIT_DATA;
|
|
/* Hosts capable of 8-bit transfers can also do 4 bits */
|
|
case 4:
|
|
host->caps |= MMC_CAP_4_BIT_DATA;
|
|
break;
|
|
case 1:
|
|
break;
|
|
default:
|
|
dev_err(host->parent,
|
|
"Invalid \"bus-width\" value %u!\n", bus_width);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* f_max is obtained from the optional "max-frequency" property */
|
|
device_property_read_u32(dev, "max-frequency", &host->f_max);
|
|
|
|
/*
|
|
* Configure CD and WP pins. They are both by default active low to
|
|
* match the SDHCI spec. If GPIOs are provided for CD and / or WP, the
|
|
* mmc-gpio helpers are used to attach, configure and use them. If
|
|
* polarity inversion is specified in DT, one of MMC_CAP2_CD_ACTIVE_HIGH
|
|
* and MMC_CAP2_RO_ACTIVE_HIGH capability-2 flags is set. If the
|
|
* "broken-cd" property is provided, the MMC_CAP_NEEDS_POLL capability
|
|
* is set. If the "non-removable" property is found, the
|
|
* MMC_CAP_NONREMOVABLE capability is set and no card-detection
|
|
* configuration is performed.
|
|
*/
|
|
|
|
/* Parse Card Detection */
|
|
if (device_property_read_bool(dev, "non-removable")) {
|
|
host->caps |= MMC_CAP_NONREMOVABLE;
|
|
} else {
|
|
cd_cap_invert = device_property_read_bool(dev, "cd-inverted");
|
|
|
|
if (device_property_read_bool(dev, "broken-cd"))
|
|
host->caps |= MMC_CAP_NEEDS_POLL;
|
|
|
|
ret = mmc_gpiod_request_cd(host, "cd", 0, true,
|
|
0, &cd_gpio_invert);
|
|
if (!ret)
|
|
dev_info(host->parent, "Got CD GPIO\n");
|
|
else if (ret != -ENOENT && ret != -ENOSYS)
|
|
return ret;
|
|
|
|
/*
|
|
* There are two ways to flag that the CD line is inverted:
|
|
* through the cd-inverted flag and by the GPIO line itself
|
|
* being inverted from the GPIO subsystem. This is a leftover
|
|
* from the times when the GPIO subsystem did not make it
|
|
* possible to flag a line as inverted.
|
|
*
|
|
* If the capability on the host AND the GPIO line are
|
|
* both inverted, the end result is that the CD line is
|
|
* not inverted.
|
|
*/
|
|
if (cd_cap_invert ^ cd_gpio_invert)
|
|
host->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
|
|
}
|
|
|
|
/* Parse Write Protection */
|
|
ro_cap_invert = device_property_read_bool(dev, "wp-inverted");
|
|
|
|
ret = mmc_gpiod_request_ro(host, "wp", 0, false, 0, &ro_gpio_invert);
|
|
if (!ret)
|
|
dev_info(host->parent, "Got WP GPIO\n");
|
|
else if (ret != -ENOENT && ret != -ENOSYS)
|
|
return ret;
|
|
|
|
if (device_property_read_bool(dev, "disable-wp"))
|
|
host->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;
|
|
|
|
/* See the comment on CD inversion above */
|
|
if (ro_cap_invert ^ ro_gpio_invert)
|
|
host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
|
|
|
|
if (device_property_read_bool(dev, "cap-sd-highspeed"))
|
|
host->caps |= MMC_CAP_SD_HIGHSPEED;
|
|
if (device_property_read_bool(dev, "cap-mmc-highspeed"))
|
|
host->caps |= MMC_CAP_MMC_HIGHSPEED;
|
|
if (device_property_read_bool(dev, "sd-uhs-sdr12"))
|
|
host->caps |= MMC_CAP_UHS_SDR12;
|
|
if (device_property_read_bool(dev, "sd-uhs-sdr25"))
|
|
host->caps |= MMC_CAP_UHS_SDR25;
|
|
if (device_property_read_bool(dev, "sd-uhs-sdr50"))
|
|
host->caps |= MMC_CAP_UHS_SDR50;
|
|
if (device_property_read_bool(dev, "sd-uhs-sdr104"))
|
|
host->caps |= MMC_CAP_UHS_SDR104;
|
|
if (device_property_read_bool(dev, "sd-uhs-ddr50"))
|
|
host->caps |= MMC_CAP_UHS_DDR50;
|
|
if (device_property_read_bool(dev, "cap-power-off-card"))
|
|
host->caps |= MMC_CAP_POWER_OFF_CARD;
|
|
if (device_property_read_bool(dev, "cap-mmc-hw-reset"))
|
|
host->caps |= MMC_CAP_HW_RESET;
|
|
if (device_property_read_bool(dev, "cap-sdio-irq"))
|
|
host->caps |= MMC_CAP_SDIO_IRQ;
|
|
if (device_property_read_bool(dev, "full-pwr-cycle"))
|
|
host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE;
|
|
if (device_property_read_bool(dev, "keep-power-in-suspend"))
|
|
host->pm_caps |= MMC_PM_KEEP_POWER;
|
|
if (device_property_read_bool(dev, "wakeup-source") ||
|
|
device_property_read_bool(dev, "enable-sdio-wakeup")) /* legacy */
|
|
host->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
|
|
if (device_property_read_bool(dev, "mmc-ddr-3_3v"))
|
|
host->caps |= MMC_CAP_3_3V_DDR;
|
|
if (device_property_read_bool(dev, "mmc-ddr-1_8v"))
|
|
host->caps |= MMC_CAP_1_8V_DDR;
|
|
if (device_property_read_bool(dev, "mmc-ddr-1_2v"))
|
|
host->caps |= MMC_CAP_1_2V_DDR;
|
|
if (device_property_read_bool(dev, "mmc-hs200-1_8v"))
|
|
host->caps2 |= MMC_CAP2_HS200_1_8V_SDR;
|
|
if (device_property_read_bool(dev, "mmc-hs200-1_2v"))
|
|
host->caps2 |= MMC_CAP2_HS200_1_2V_SDR;
|
|
if (device_property_read_bool(dev, "mmc-hs400-1_8v"))
|
|
host->caps2 |= MMC_CAP2_HS400_1_8V | MMC_CAP2_HS200_1_8V_SDR;
|
|
if (device_property_read_bool(dev, "mmc-hs400-1_2v"))
|
|
host->caps2 |= MMC_CAP2_HS400_1_2V | MMC_CAP2_HS200_1_2V_SDR;
|
|
if (device_property_read_bool(dev, "mmc-hs400-enhanced-strobe"))
|
|
host->caps2 |= MMC_CAP2_HS400_ES;
|
|
if (device_property_read_bool(dev, "no-sdio"))
|
|
host->caps2 |= MMC_CAP2_NO_SDIO;
|
|
if (device_property_read_bool(dev, "no-sd"))
|
|
host->caps2 |= MMC_CAP2_NO_SD;
|
|
if (device_property_read_bool(dev, "no-mmc"))
|
|
host->caps2 |= MMC_CAP2_NO_MMC;
|
|
|
|
host->dsr_req = !device_property_read_u32(dev, "dsr", &host->dsr);
|
|
if (host->dsr_req && (host->dsr & ~0xffff)) {
|
|
dev_err(host->parent,
|
|
"device tree specified broken value for DSR: 0x%x, ignoring\n",
|
|
host->dsr);
|
|
host->dsr_req = 0;
|
|
}
|
|
|
|
return mmc_pwrseq_alloc(host);
|
|
}
|
|
|
|
EXPORT_SYMBOL(mmc_of_parse);
|
|
|
|
/**
|
|
* mmc_alloc_host - initialise the per-host structure.
|
|
* @extra: sizeof private data structure
|
|
* @dev: pointer to host device model structure
|
|
*
|
|
* Initialise the per-host structure.
|
|
*/
|
|
struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
|
|
{
|
|
int err;
|
|
struct mmc_host *host;
|
|
|
|
host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
|
|
if (!host)
|
|
return NULL;
|
|
|
|
/* scanning will be enabled when we're ready */
|
|
host->rescan_disable = 1;
|
|
|
|
err = ida_simple_get(&mmc_host_ida, 0, 0, GFP_KERNEL);
|
|
if (err < 0) {
|
|
kfree(host);
|
|
return NULL;
|
|
}
|
|
|
|
host->index = err;
|
|
|
|
dev_set_name(&host->class_dev, "mmc%d", host->index);
|
|
|
|
host->parent = dev;
|
|
host->class_dev.parent = dev;
|
|
host->class_dev.class = &mmc_host_class;
|
|
device_initialize(&host->class_dev);
|
|
device_enable_async_suspend(&host->class_dev);
|
|
|
|
if (mmc_gpio_alloc(host)) {
|
|
put_device(&host->class_dev);
|
|
return NULL;
|
|
}
|
|
|
|
if (!mmc_host_clk_gate_wq_init(host)) {
|
|
kfree(host);
|
|
return NULL;
|
|
}
|
|
|
|
mmc_host_clk_init(host);
|
|
|
|
spin_lock_init(&host->lock);
|
|
init_waitqueue_head(&host->wq);
|
|
host->wlock_name = kasprintf(GFP_KERNEL,
|
|
"%s_detect", mmc_hostname(host));
|
|
wake_lock_init(&host->detect_wake_lock, WAKE_LOCK_SUSPEND,
|
|
host->wlock_name);
|
|
INIT_DELAYED_WORK(&host->detect, mmc_rescan);
|
|
INIT_DELAYED_WORK(&host->sdio_irq_work, sdio_irq_work);
|
|
setup_timer(&host->retune_timer, mmc_retune_timer, (unsigned long)host);
|
|
|
|
mutex_init(&host->rpmb_req_mutex);
|
|
|
|
/*
|
|
* By default, hosts do not support SGIO or large requests.
|
|
* They have to set these according to their abilities.
|
|
*/
|
|
host->max_segs = 1;
|
|
host->max_seg_size = PAGE_SIZE;
|
|
|
|
host->max_req_size = PAGE_SIZE;
|
|
host->max_blk_size = 512;
|
|
host->max_blk_count = PAGE_SIZE / 512;
|
|
host->ios.power_delay_ms = 10;
|
|
|
|
return host;
|
|
}
|
|
|
|
EXPORT_SYMBOL(mmc_alloc_host);
|
|
|
|
static ssize_t show_enable(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct mmc_host *host = cls_dev_to_mmc_host(dev);
|
|
|
|
if (!host)
|
|
return -EINVAL;
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", mmc_can_scale_clk(host));
|
|
}
|
|
|
|
static ssize_t store_enable(struct device *dev,
|
|
struct device_attribute *attr, const char *buf, size_t count)
|
|
{
|
|
struct mmc_host *host = cls_dev_to_mmc_host(dev);
|
|
unsigned long value;
|
|
|
|
if (!host || !host->card || kstrtoul(buf, 0, &value))
|
|
return -EINVAL;
|
|
|
|
mmc_get_card(host->card);
|
|
|
|
if (!value) {
|
|
/* Suspend the clock scaling and mask host capability */
|
|
if (host->clk_scaling.enable)
|
|
mmc_suspend_clk_scaling(host);
|
|
host->clk_scaling.enable = false;
|
|
host->caps2 &= ~MMC_CAP2_CLK_SCALE;
|
|
host->clk_scaling.state = MMC_LOAD_HIGH;
|
|
/* Set to max. frequency when disabling */
|
|
mmc_clk_update_freq(host, host->card->clk_scaling_highest,
|
|
host->clk_scaling.state);
|
|
} else if (value) {
|
|
/* Unmask host capability and resume scaling */
|
|
host->caps2 |= MMC_CAP2_CLK_SCALE;
|
|
if (!host->clk_scaling.enable) {
|
|
host->clk_scaling.enable = true;
|
|
mmc_resume_clk_scaling(host);
|
|
}
|
|
}
|
|
|
|
mmc_put_card(host->card);
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t show_up_threshold(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct mmc_host *host = cls_dev_to_mmc_host(dev);
|
|
|
|
if (!host)
|
|
return -EINVAL;
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", host->clk_scaling.upthreshold);
|
|
}
|
|
|
|
#define MAX_PERCENTAGE 100
|
|
static ssize_t store_up_threshold(struct device *dev,
|
|
struct device_attribute *attr, const char *buf, size_t count)
|
|
{
|
|
struct mmc_host *host = cls_dev_to_mmc_host(dev);
|
|
unsigned long value;
|
|
|
|
if (!host || kstrtoul(buf, 0, &value) || (value > MAX_PERCENTAGE))
|
|
return -EINVAL;
|
|
|
|
host->clk_scaling.upthreshold = value;
|
|
|
|
pr_debug("%s: clkscale_up_thresh set to %lu\n",
|
|
mmc_hostname(host), value);
|
|
return count;
|
|
}
|
|
|
|
static ssize_t show_down_threshold(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct mmc_host *host = cls_dev_to_mmc_host(dev);
|
|
|
|
if (!host)
|
|
return -EINVAL;
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%d\n",
|
|
host->clk_scaling.downthreshold);
|
|
}
|
|
|
|
static ssize_t store_down_threshold(struct device *dev,
|
|
struct device_attribute *attr, const char *buf, size_t count)
|
|
{
|
|
struct mmc_host *host = cls_dev_to_mmc_host(dev);
|
|
unsigned long value;
|
|
|
|
if (!host || kstrtoul(buf, 0, &value) || (value > MAX_PERCENTAGE))
|
|
return -EINVAL;
|
|
|
|
host->clk_scaling.downthreshold = value;
|
|
|
|
pr_debug("%s: clkscale_down_thresh set to %lu\n",
|
|
mmc_hostname(host), value);
|
|
return count;
|
|
}
|
|
|
|
static ssize_t show_polling(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct mmc_host *host = cls_dev_to_mmc_host(dev);
|
|
|
|
if (!host)
|
|
return -EINVAL;
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%lu milliseconds\n",
|
|
host->clk_scaling.polling_delay_ms);
|
|
}
|
|
|
|
static ssize_t store_polling(struct device *dev,
|
|
struct device_attribute *attr, const char *buf, size_t count)
|
|
{
|
|
struct mmc_host *host = cls_dev_to_mmc_host(dev);
|
|
unsigned long value;
|
|
|
|
if (!host || kstrtoul(buf, 0, &value))
|
|
return -EINVAL;
|
|
|
|
host->clk_scaling.polling_delay_ms = value;
|
|
|
|
pr_debug("%s: clkscale_polling_delay_ms set to %lu\n",
|
|
mmc_hostname(host), value);
|
|
return count;
|
|
}
|
|
|
|
DEVICE_ATTR(enable, 0644,
|
|
show_enable, store_enable);
|
|
DEVICE_ATTR(polling_interval, 0644,
|
|
show_polling, store_polling);
|
|
DEVICE_ATTR(up_threshold, 0644,
|
|
show_up_threshold, store_up_threshold);
|
|
DEVICE_ATTR(down_threshold, 0644,
|
|
show_down_threshold, store_down_threshold);
|
|
|
|
static struct attribute *clk_scaling_attrs[] = {
|
|
&dev_attr_enable.attr,
|
|
&dev_attr_up_threshold.attr,
|
|
&dev_attr_down_threshold.attr,
|
|
&dev_attr_polling_interval.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group clk_scaling_attr_grp = {
|
|
.name = "clk_scaling",
|
|
.attrs = clk_scaling_attrs,
|
|
};
|
|
|
|
#ifdef CONFIG_MMC_PERF_PROFILING
|
|
static ssize_t
|
|
show_perf(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct mmc_host *host = cls_dev_to_mmc_host(dev);
|
|
int64_t rtime_drv, wtime_drv;
|
|
unsigned long rbytes_drv, wbytes_drv, flags;
|
|
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
|
|
rbytes_drv = host->perf.rbytes_drv;
|
|
wbytes_drv = host->perf.wbytes_drv;
|
|
|
|
rtime_drv = ktime_to_us(host->perf.rtime_drv);
|
|
wtime_drv = ktime_to_us(host->perf.wtime_drv);
|
|
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
|
|
return snprintf(buf, PAGE_SIZE, "Write performance at driver Level:"
|
|
"%lu bytes in %lld microseconds\n"
|
|
"Read performance at driver Level:"
|
|
"%lu bytes in %lld microseconds\n",
|
|
wbytes_drv, wtime_drv,
|
|
rbytes_drv, rtime_drv);
|
|
}
|
|
|
|
static ssize_t
|
|
set_perf(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct mmc_host *host = cls_dev_to_mmc_host(dev);
|
|
int64_t value;
|
|
unsigned long flags;
|
|
|
|
sscanf(buf, "%lld", &value);
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
if (!value) {
|
|
memset(&host->perf, 0, sizeof(host->perf));
|
|
host->perf_enable = false;
|
|
} else {
|
|
host->perf_enable = true;
|
|
}
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR(perf, 0644,
|
|
show_perf, set_perf);
|
|
|
|
#endif
|
|
|
|
static struct attribute *dev_attrs[] = {
|
|
#ifdef CONFIG_MMC_PERF_PROFILING
|
|
&dev_attr_perf.attr,
|
|
#endif
|
|
NULL,
|
|
};
|
|
static struct attribute_group dev_attr_grp = {
|
|
.attrs = dev_attrs,
|
|
};
|
|
|
|
/**
|
|
* mmc_add_host - initialise host hardware
|
|
* @host: mmc host
|
|
*
|
|
* Register the host with the driver model. The host must be
|
|
* prepared to start servicing requests before this function
|
|
* completes.
|
|
*/
|
|
int mmc_add_host(struct mmc_host *host)
|
|
{
|
|
int err;
|
|
|
|
WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) &&
|
|
!host->ops->enable_sdio_irq);
|
|
|
|
err = device_add(&host->class_dev);
|
|
if (err)
|
|
return err;
|
|
|
|
led_trigger_register_simple(dev_name(&host->class_dev), &host->led);
|
|
|
|
host->clk_scaling.upthreshold = MMC_DEVFRQ_DEFAULT_UP_THRESHOLD;
|
|
host->clk_scaling.downthreshold = MMC_DEVFRQ_DEFAULT_DOWN_THRESHOLD;
|
|
host->clk_scaling.polling_delay_ms = MMC_DEVFRQ_DEFAULT_POLLING_MSEC;
|
|
host->clk_scaling.skip_clk_scale_freq_update = false;
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
mmc_add_host_debugfs(host);
|
|
#endif
|
|
mmc_host_clk_sysfs_init(host);
|
|
mmc_trace_init(host);
|
|
|
|
err = sysfs_create_group(&host->class_dev.kobj, &clk_scaling_attr_grp);
|
|
if (err)
|
|
pr_err("%s: failed to create clk scale sysfs group with err %d\n",
|
|
__func__, err);
|
|
|
|
#ifdef CONFIG_BLOCK
|
|
mmc_latency_hist_sysfs_init(host);
|
|
#endif
|
|
|
|
err = sysfs_create_group(&host->class_dev.kobj, &dev_attr_grp);
|
|
if (err)
|
|
pr_err("%s: failed to create sysfs group with err %d\n",
|
|
__func__, err);
|
|
|
|
mmc_start_host(host);
|
|
if (!(host->pm_flags & MMC_PM_IGNORE_PM_NOTIFY))
|
|
mmc_register_pm_notifier(host);
|
|
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(mmc_add_host);
|
|
|
|
/**
|
|
* mmc_remove_host - remove host hardware
|
|
* @host: mmc host
|
|
*
|
|
* Unregister and remove all cards associated with this host,
|
|
* and power down the MMC bus. No new requests will be issued
|
|
* after this function has returned.
|
|
*/
|
|
void mmc_remove_host(struct mmc_host *host)
|
|
{
|
|
if (!(host->pm_flags & MMC_PM_IGNORE_PM_NOTIFY))
|
|
mmc_unregister_pm_notifier(host);
|
|
mmc_stop_host(host);
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
mmc_remove_host_debugfs(host);
|
|
#endif
|
|
|
|
#ifdef CONFIG_BLOCK
|
|
mmc_latency_hist_sysfs_exit(host);
|
|
#endif
|
|
|
|
sysfs_remove_group(&host->parent->kobj, &dev_attr_grp);
|
|
sysfs_remove_group(&host->class_dev.kobj, &clk_scaling_attr_grp);
|
|
|
|
device_del(&host->class_dev);
|
|
|
|
led_trigger_unregister_simple(host->led);
|
|
|
|
mmc_host_clk_exit(host);
|
|
}
|
|
|
|
EXPORT_SYMBOL(mmc_remove_host);
|
|
|
|
/**
|
|
* mmc_free_host - free the host structure
|
|
* @host: mmc host
|
|
*
|
|
* Free the host once all references to it have been dropped.
|
|
*/
|
|
void mmc_free_host(struct mmc_host *host)
|
|
{
|
|
mmc_crypto_free_host(host);
|
|
mmc_pwrseq_free(host);
|
|
wake_lock_destroy(&host->detect_wake_lock);
|
|
put_device(&host->class_dev);
|
|
}
|
|
|
|
EXPORT_SYMBOL(mmc_free_host);
|
|
|