489 lines
12 KiB
C
489 lines
12 KiB
C
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/*
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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) 2016-2017, NVIDIA CORPORATION. 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/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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static DEFINE_IDA(mmc_host_ida);
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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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ida_remove(&mmc_host_ida, 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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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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/*
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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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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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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)
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{
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if (!host->hold_retune)
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host->retune_now = 1;
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host->hold_retune += 1;
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}
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void mmc_retune_release(struct mmc_host *host)
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{
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if (host->hold_retune)
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host->hold_retune -= 1;
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else
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WARN_ON(1);
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}
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int mmc_retune(struct mmc_host *host)
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{
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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;
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if (!host->need_retune || host->doing_retune || !host->card)
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return 0;
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host->need_retune = 0;
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host->doing_retune = 1;
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if (host->ios.timing == MMC_TIMING_MMC_HS400) {
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err = mmc_hs400_to_hs200(host->card);
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if (err)
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goto out;
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return_to_hs400 = true;
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if (host->ops->prepare_hs400_tuning)
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host->ops->prepare_hs400_tuning(host, &host->ios);
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}
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err = mmc_execute_tuning(host->card);
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if (err)
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goto out;
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if (return_to_hs400)
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err = mmc_hs200_to_hs400(host->card);
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out:
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host->doing_retune = 0;
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return err;
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}
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static void mmc_retune_timer(unsigned long data)
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{
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struct mmc_host *host = (struct mmc_host *)data;
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mmc_retune_needed(host);
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}
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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 *dev = host->parent;
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u32 bus_width;
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int 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 (!dev || !dev_fwnode(dev))
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return 0;
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/* "bus-width" is translated to MMC_CAP_*_BIT_DATA flags */
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if (device_property_read_u32(dev, "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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device_property_read_u32(dev, "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 (device_property_read_bool(dev, "non-removable")) {
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host->caps |= MMC_CAP_NONREMOVABLE;
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} else {
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cd_cap_invert = device_property_read_bool(dev, "cd-inverted");
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if (device_property_read_bool(dev, "broken-cd"))
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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 && ret != -ENOSYS)
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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 = device_property_read_bool(dev, "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 && ret != -ENOSYS)
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return ret;
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if (device_property_read_bool(dev, "disable-wp"))
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host->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;
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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 (device_property_read_bool(dev, "cap-sd-highspeed"))
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host->caps |= MMC_CAP_SD_HIGHSPEED;
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if (device_property_read_bool(dev, "cap-mmc-highspeed"))
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host->caps |= MMC_CAP_MMC_HIGHSPEED;
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if (device_property_read_bool(dev, "sd-uhs-sdr12"))
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host->caps |= MMC_CAP_UHS_SDR12;
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if (device_property_read_bool(dev, "sd-uhs-sdr25"))
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host->caps |= MMC_CAP_UHS_SDR25;
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if (device_property_read_bool(dev, "sd-uhs-sdr50"))
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host->caps |= MMC_CAP_UHS_SDR50;
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if (device_property_read_bool(dev, "sd-uhs-sdr104"))
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host->caps |= MMC_CAP_UHS_SDR104;
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if (device_property_read_bool(dev, "sd-uhs-ddr50"))
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host->caps |= MMC_CAP_UHS_DDR50;
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if (device_property_read_bool(dev, "cap-power-off-card"))
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host->caps |= MMC_CAP_POWER_OFF_CARD;
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if (device_property_read_bool(dev, "cap-mmc-hw-reset"))
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host->caps |= MMC_CAP_HW_RESET;
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if (device_property_read_bool(dev, "cap-sdio-irq"))
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host->caps |= MMC_CAP_SDIO_IRQ;
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if (device_property_read_bool(dev, "full-pwr-cycle"))
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host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE;
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if (device_property_read_bool(dev, "keep-power-in-suspend"))
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host->pm_caps |= MMC_PM_KEEP_POWER;
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if (device_property_read_bool(dev, "wakeup-source") ||
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device_property_read_bool(dev, "enable-sdio-wakeup")) /* legacy */
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host->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
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if (device_property_read_bool(dev, "ignore-pm-notify"))
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host->pm_caps |= MMC_PM_IGNORE_PM_NOTIFY;
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if (device_property_read_bool(dev, "mmc-ddr-1_8v"))
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host->caps |= MMC_CAP_1_8V_DDR;
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if (device_property_read_bool(dev, "mmc-ddr-1_2v"))
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host->caps |= MMC_CAP_1_2V_DDR;
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if (device_property_read_bool(dev, "mmc-hs200-1_8v"))
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host->caps2 |= MMC_CAP2_HS200_1_8V_SDR;
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if (device_property_read_bool(dev, "mmc-hs200-1_2v"))
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host->caps2 |= MMC_CAP2_HS200_1_2V_SDR;
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if (device_property_read_bool(dev, "mmc-hs400-1_8v"))
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host->caps2 |= MMC_CAP2_HS400_1_8V | MMC_CAP2_HS200_1_8V_SDR;
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if (device_property_read_bool(dev, "mmc-hs400-1_2v"))
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host->caps2 |= MMC_CAP2_HS400_1_2V | MMC_CAP2_HS200_1_2V_SDR;
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if (device_property_read_bool(dev, "mmc-hs400-enhanced-strobe"))
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host->caps2 |= MMC_CAP2_HS400_ES;
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if (device_property_read_bool(dev, "no-sdio"))
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host->caps2 |= MMC_CAP2_NO_SDIO;
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if (device_property_read_bool(dev, "no-sd"))
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host->caps2 |= MMC_CAP2_NO_SD;
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if (device_property_read_bool(dev, "no-mmc"))
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host->caps2 |= MMC_CAP2_NO_MMC;
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if (device_property_read_bool(dev, "only-1-8-v"))
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host->caps2 |= MMC_CAP2_ONLY_1V8_SIGNAL_VOLTAGE;
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host->dsr_req = !device_property_read_u32(dev, "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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{
|
||
|
|
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;
|
||
|
|
|
||
|
|
again:
|
||
|
|
if (!ida_pre_get(&mmc_host_ida, GFP_KERNEL)) {
|
||
|
|
kfree(host);
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
spin_lock(&mmc_host_lock);
|
||
|
|
err = ida_get_new(&mmc_host_ida, &host->index);
|
||
|
|
spin_unlock(&mmc_host_lock);
|
||
|
|
|
||
|
|
if (err == -EAGAIN) {
|
||
|
|
goto again;
|
||
|
|
} else if (err) {
|
||
|
|
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);
|
||
|
|
device_enable_async_suspend(&host->class_dev);
|
||
|
|
|
||
|
|
if (mmc_gpio_alloc(host)) {
|
||
|
|
put_device(&host->class_dev);
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
spin_lock_init(&host->lock);
|
||
|
|
init_waitqueue_head(&host->wq);
|
||
|
|
INIT_DELAYED_WORK(&host->detect, mmc_rescan);
|
||
|
|
setup_timer(&host->retune_timer, mmc_retune_timer, (unsigned long)host);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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;
|
||
|
|
|
||
|
|
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
|
||
|
|
|
||
|
|
#ifdef CONFIG_BLOCK
|
||
|
|
mmc_latency_hist_sysfs_init(host);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
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
|
||
|
|
|
||
|
|
device_del(&host->class_dev);
|
||
|
|
|
||
|
|
led_trigger_unregister_simple(host->led);
|
||
|
|
}
|
||
|
|
|
||
|
|
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);
|