mirror of https://gitee.com/openkylin/linux.git
597 lines
16 KiB
C
597 lines
16 KiB
C
/*
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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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*
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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/suspend.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/slot-gpio.h>
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#include "core.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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#define cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev)
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static DEFINE_IDR(mmc_host_idr);
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static DEFINE_SPINLOCK(mmc_host_lock);
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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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spin_lock(&mmc_host_lock);
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idr_remove(&mmc_host_idr, host->index);
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spin_unlock(&mmc_host_lock);
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kfree(host);
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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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};
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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, "
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"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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}
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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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}
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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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/**
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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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static 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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* 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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schedule_delayed_work(&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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/**
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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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/* 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 = S_IRUGO | S_IWUSR;
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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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#else
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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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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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#endif
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/**
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* mmc_of_parse() - parse host's device-tree node
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* @host: host whose node should be parsed.
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*
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* To keep the rest of the MMC subsystem unaware of whether DT has been
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* used to to instantiate and configure this host instance or not, we
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* parse the properties and set respective generic mmc-host flags and
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* parameters.
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*/
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int mmc_of_parse(struct mmc_host *host)
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{
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struct device_node *np;
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u32 bus_width;
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int len, ret;
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bool cd_cap_invert, cd_gpio_invert = false;
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bool ro_cap_invert, ro_gpio_invert = false;
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if (!host->parent || !host->parent->of_node)
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return 0;
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np = host->parent->of_node;
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/* "bus-width" is translated to MMC_CAP_*_BIT_DATA flags */
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if (of_property_read_u32(np, "bus-width", &bus_width) < 0) {
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dev_dbg(host->parent,
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"\"bus-width\" property is missing, assuming 1 bit.\n");
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bus_width = 1;
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}
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switch (bus_width) {
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case 8:
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host->caps |= MMC_CAP_8_BIT_DATA;
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/* Hosts capable of 8-bit transfers can also do 4 bits */
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case 4:
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host->caps |= MMC_CAP_4_BIT_DATA;
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break;
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case 1:
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break;
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default:
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dev_err(host->parent,
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"Invalid \"bus-width\" value %u!\n", bus_width);
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return -EINVAL;
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}
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/* f_max is obtained from the optional "max-frequency" property */
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of_property_read_u32(np, "max-frequency", &host->f_max);
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/*
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* Configure CD and WP pins. They are both by default active low to
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* match the SDHCI spec. If GPIOs are provided for CD and / or WP, the
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* mmc-gpio helpers are used to attach, configure and use them. If
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* polarity inversion is specified in DT, one of MMC_CAP2_CD_ACTIVE_HIGH
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* and MMC_CAP2_RO_ACTIVE_HIGH capability-2 flags is set. If the
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* "broken-cd" property is provided, the MMC_CAP_NEEDS_POLL capability
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* is set. If the "non-removable" property is found, the
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* MMC_CAP_NONREMOVABLE capability is set and no card-detection
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* configuration is performed.
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*/
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/* Parse Card Detection */
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if (of_find_property(np, "non-removable", &len)) {
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host->caps |= MMC_CAP_NONREMOVABLE;
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} else {
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cd_cap_invert = of_property_read_bool(np, "cd-inverted");
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if (of_find_property(np, "broken-cd", &len))
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host->caps |= MMC_CAP_NEEDS_POLL;
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ret = mmc_gpiod_request_cd(host, "cd", 0, true,
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0, &cd_gpio_invert);
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if (!ret)
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dev_info(host->parent, "Got CD GPIO\n");
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else if (ret != -ENOENT)
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return ret;
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/*
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* There are two ways to flag that the CD line is inverted:
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* through the cd-inverted flag and by the GPIO line itself
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* being inverted from the GPIO subsystem. This is a leftover
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* from the times when the GPIO subsystem did not make it
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* possible to flag a line as inverted.
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*
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* If the capability on the host AND the GPIO line are
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* both inverted, the end result is that the CD line is
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* not inverted.
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*/
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if (cd_cap_invert ^ cd_gpio_invert)
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host->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
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}
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/* Parse Write Protection */
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ro_cap_invert = of_property_read_bool(np, "wp-inverted");
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ret = mmc_gpiod_request_ro(host, "wp", 0, false, 0, &ro_gpio_invert);
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if (!ret)
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dev_info(host->parent, "Got WP GPIO\n");
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else if (ret != -ENOENT)
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return ret;
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/* See the comment on CD inversion above */
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if (ro_cap_invert ^ ro_gpio_invert)
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host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
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if (of_find_property(np, "cap-sd-highspeed", &len))
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host->caps |= MMC_CAP_SD_HIGHSPEED;
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if (of_find_property(np, "cap-mmc-highspeed", &len))
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host->caps |= MMC_CAP_MMC_HIGHSPEED;
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if (of_find_property(np, "sd-uhs-sdr12", &len))
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host->caps |= MMC_CAP_UHS_SDR12;
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if (of_find_property(np, "sd-uhs-sdr25", &len))
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host->caps |= MMC_CAP_UHS_SDR25;
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if (of_find_property(np, "sd-uhs-sdr50", &len))
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host->caps |= MMC_CAP_UHS_SDR50;
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if (of_find_property(np, "sd-uhs-sdr104", &len))
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host->caps |= MMC_CAP_UHS_SDR104;
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if (of_find_property(np, "sd-uhs-ddr50", &len))
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host->caps |= MMC_CAP_UHS_DDR50;
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if (of_find_property(np, "cap-power-off-card", &len))
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host->caps |= MMC_CAP_POWER_OFF_CARD;
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if (of_find_property(np, "cap-sdio-irq", &len))
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host->caps |= MMC_CAP_SDIO_IRQ;
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if (of_find_property(np, "full-pwr-cycle", &len))
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host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE;
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if (of_find_property(np, "keep-power-in-suspend", &len))
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host->pm_caps |= MMC_PM_KEEP_POWER;
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if (of_find_property(np, "enable-sdio-wakeup", &len))
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host->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
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if (of_find_property(np, "mmc-ddr-1_8v", &len))
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host->caps |= MMC_CAP_1_8V_DDR;
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if (of_find_property(np, "mmc-ddr-1_2v", &len))
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host->caps |= MMC_CAP_1_2V_DDR;
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if (of_find_property(np, "mmc-hs200-1_8v", &len))
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host->caps2 |= MMC_CAP2_HS200_1_8V_SDR;
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if (of_find_property(np, "mmc-hs200-1_2v", &len))
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host->caps2 |= MMC_CAP2_HS200_1_2V_SDR;
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if (of_find_property(np, "mmc-hs400-1_8v", &len))
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host->caps2 |= MMC_CAP2_HS400_1_8V | MMC_CAP2_HS200_1_8V_SDR;
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if (of_find_property(np, "mmc-hs400-1_2v", &len))
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host->caps2 |= MMC_CAP2_HS400_1_2V | MMC_CAP2_HS200_1_2V_SDR;
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host->dsr_req = !of_property_read_u32(np, "dsr", &host->dsr);
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if (host->dsr_req && (host->dsr & ~0xffff)) {
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dev_err(host->parent,
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"device tree specified broken value for DSR: 0x%x, ignoring\n",
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host->dsr);
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host->dsr_req = 0;
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}
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return mmc_pwrseq_alloc(host);
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}
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EXPORT_SYMBOL(mmc_of_parse);
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/**
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* mmc_alloc_host - initialise the per-host structure.
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* @extra: sizeof private data structure
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* @dev: pointer to host device model structure
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*
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* Initialise the per-host structure.
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*/
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struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
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{
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int err;
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struct mmc_host *host;
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|
|
|
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;
|
|
idr_preload(GFP_KERNEL);
|
|
spin_lock(&mmc_host_lock);
|
|
err = idr_alloc(&mmc_host_idr, host, 0, 0, GFP_NOWAIT);
|
|
if (err >= 0)
|
|
host->index = err;
|
|
spin_unlock(&mmc_host_lock);
|
|
idr_preload_end();
|
|
if (err < 0) {
|
|
kfree(host);
|
|
return NULL;
|
|
}
|
|
|
|
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);
|
|
|
|
if (mmc_gpio_alloc(host)) {
|
|
put_device(&host->class_dev);
|
|
return NULL;
|
|
}
|
|
|
|
mmc_host_clk_init(host);
|
|
|
|
spin_lock_init(&host->lock);
|
|
init_waitqueue_head(&host->wq);
|
|
INIT_DELAYED_WORK(&host->detect, mmc_rescan);
|
|
#ifdef CONFIG_PM
|
|
host->pm_notify.notifier_call = mmc_pm_notify;
|
|
#endif
|
|
|
|
/*
|
|
* 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_CACHE_SIZE;
|
|
|
|
host->max_req_size = PAGE_CACHE_SIZE;
|
|
host->max_blk_size = 512;
|
|
host->max_blk_count = PAGE_CACHE_SIZE / 512;
|
|
|
|
return host;
|
|
}
|
|
|
|
EXPORT_SYMBOL(mmc_alloc_host);
|
|
|
|
/**
|
|
* 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);
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
mmc_add_host_debugfs(host);
|
|
#endif
|
|
mmc_host_clk_sysfs_init(host);
|
|
|
|
mmc_start_host(host);
|
|
register_pm_notifier(&host->pm_notify);
|
|
|
|
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)
|
|
{
|
|
unregister_pm_notifier(&host->pm_notify);
|
|
mmc_stop_host(host);
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
mmc_remove_host_debugfs(host);
|
|
#endif
|
|
|
|
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_pwrseq_free(host);
|
|
put_device(&host->class_dev);
|
|
}
|
|
|
|
EXPORT_SYMBOL(mmc_free_host);
|