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![Ye Bin](/assets/img/avatar_default.png)
Now, CONFIG_DEBUG_FS is scattered in various functions, to make code clean centralized processing CONFIG_DEBUG_FS in mmc debugfs module. Signed-off-by: Ye Bin <yebin10@huawei.com> Link: https://lore.kernel.org/r/20221126102520.2824574-1-yebin@huaweicloud.com Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
673 lines
17 KiB
C
673 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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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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*
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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/pm_wakeup.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 "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 cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev)
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static DEFINE_IDA(mmc_host_ida);
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#ifdef CONFIG_PM_SLEEP
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static int mmc_host_class_prepare(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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/*
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* It's safe to access the bus_ops pointer, as both userspace and the
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* workqueue for detecting cards are frozen at this point.
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*/
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if (!host->bus_ops)
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return 0;
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/* Validate conditions for system suspend. */
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if (host->bus_ops->pre_suspend)
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return host->bus_ops->pre_suspend(host);
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return 0;
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}
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static void mmc_host_class_complete(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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_mmc_detect_change(host, 0, false);
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}
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static const struct dev_pm_ops mmc_host_class_dev_pm_ops = {
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.prepare = mmc_host_class_prepare,
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.complete = mmc_host_class_complete,
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};
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#define MMC_HOST_CLASS_DEV_PM_OPS (&mmc_host_class_dev_pm_ops)
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#else
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#define MMC_HOST_CLASS_DEV_PM_OPS NULL
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#endif
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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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wakeup_source_unregister(host->ws);
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if (of_alias_get_id(host->parent->of_node, "mmc") < 0)
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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_classdev_shutdown(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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__mmc_stop_host(host);
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return 0;
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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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.shutdown_pre = mmc_host_classdev_shutdown,
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.pm = MMC_HOST_CLASS_DEV_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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/**
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* mmc_retune_enable() - enter a transfer mode that requires retuning
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* @host: host which should retune now
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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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/**
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* mmc_retune_disable() - exit a transfer mode that requires retuning
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* @host: host which should not retune anymore
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*
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* It is not meant for temporarily preventing retuning!
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*/
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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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mmc_retune_clear(host);
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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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EXPORT_SYMBOL(mmc_retune_release);
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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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}
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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(struct timer_list *t)
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{
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struct mmc_host *host = from_timer(host, t, retune_timer);
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mmc_retune_needed(host);
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}
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static void mmc_of_parse_timing_phase(struct device *dev, const char *prop,
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struct mmc_clk_phase *phase)
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{
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int degrees[2] = {0};
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int rc;
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rc = device_property_read_u32_array(dev, prop, degrees, 2);
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phase->valid = !rc;
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if (phase->valid) {
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phase->in_deg = degrees[0];
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phase->out_deg = degrees[1];
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}
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}
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void
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mmc_of_parse_clk_phase(struct mmc_host *host, struct mmc_clk_phase_map *map)
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{
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struct device *dev = host->parent;
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mmc_of_parse_timing_phase(dev, "clk-phase-legacy",
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&map->phase[MMC_TIMING_LEGACY]);
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mmc_of_parse_timing_phase(dev, "clk-phase-mmc-hs",
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&map->phase[MMC_TIMING_MMC_HS]);
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mmc_of_parse_timing_phase(dev, "clk-phase-sd-hs",
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&map->phase[MMC_TIMING_SD_HS]);
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mmc_of_parse_timing_phase(dev, "clk-phase-uhs-sdr12",
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&map->phase[MMC_TIMING_UHS_SDR12]);
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mmc_of_parse_timing_phase(dev, "clk-phase-uhs-sdr25",
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&map->phase[MMC_TIMING_UHS_SDR25]);
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mmc_of_parse_timing_phase(dev, "clk-phase-uhs-sdr50",
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&map->phase[MMC_TIMING_UHS_SDR50]);
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mmc_of_parse_timing_phase(dev, "clk-phase-uhs-sdr104",
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&map->phase[MMC_TIMING_UHS_SDR104]);
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mmc_of_parse_timing_phase(dev, "clk-phase-uhs-ddr50",
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&map->phase[MMC_TIMING_UHS_DDR50]);
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mmc_of_parse_timing_phase(dev, "clk-phase-mmc-ddr52",
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&map->phase[MMC_TIMING_MMC_DDR52]);
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mmc_of_parse_timing_phase(dev, "clk-phase-mmc-hs200",
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&map->phase[MMC_TIMING_MMC_HS200]);
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mmc_of_parse_timing_phase(dev, "clk-phase-mmc-hs400",
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&map->phase[MMC_TIMING_MMC_HS400]);
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}
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EXPORT_SYMBOL(mmc_of_parse_clk_phase);
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/**
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* mmc_of_parse() - parse host's device properties
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* @host: host whose properties 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 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, drv_type, cd_debounce_delay_ms;
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int ret;
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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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fallthrough; /* Hosts capable of 8-bit 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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if (device_property_read_bool(dev, "cd-inverted"))
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host->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
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if (device_property_read_u32(dev, "cd-debounce-delay-ms",
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&cd_debounce_delay_ms))
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cd_debounce_delay_ms = 200;
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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, false,
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cd_debounce_delay_ms * 1000);
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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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/* Parse Write Protection */
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if (device_property_read_bool(dev, "wp-inverted"))
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host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
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ret = mmc_gpiod_request_ro(host, "wp", 0, 0);
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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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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, "full-pwr-cycle-in-suspend"))
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host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE_IN_SUSPEND;
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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, "mmc-ddr-3_3v"))
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host->caps |= MMC_CAP_3_3V_DDR;
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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, "no-mmc-hs400"))
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host->caps2 &= ~(MMC_CAP2_HS400_1_8V | MMC_CAP2_HS400_1_2V |
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MMC_CAP2_HS400_ES);
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/* Must be after "non-removable" check */
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if (device_property_read_u32(dev, "fixed-emmc-driver-type", &drv_type) == 0) {
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if (host->caps & MMC_CAP_NONREMOVABLE)
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host->fixed_drv_type = drv_type;
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else
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dev_err(host->parent,
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"can't use fixed driver type, media is removable\n");
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}
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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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device_property_read_u32(dev, "post-power-on-delay-ms",
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&host->ios.power_delay_ms);
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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_of_parse_voltage - return mask of supported voltages
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* @host: host whose properties should be parsed.
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* @mask: mask of voltages available for MMC/SD/SDIO
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*
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* Parse the "voltage-ranges" property, returning zero if it is not
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* found, negative errno if the voltage-range specification is invalid,
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* or one if the voltage-range is specified and successfully parsed.
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*/
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|
int mmc_of_parse_voltage(struct mmc_host *host, u32 *mask)
|
|
{
|
|
const char *prop = "voltage-ranges";
|
|
struct device *dev = host->parent;
|
|
u32 *voltage_ranges;
|
|
int num_ranges, i;
|
|
int ret;
|
|
|
|
if (!device_property_present(dev, prop)) {
|
|
dev_dbg(dev, "%s unspecified\n", prop);
|
|
return 0;
|
|
}
|
|
|
|
ret = device_property_count_u32(dev, prop);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
num_ranges = ret / 2;
|
|
if (!num_ranges) {
|
|
dev_err(dev, "%s empty\n", prop);
|
|
return -EINVAL;
|
|
}
|
|
|
|
voltage_ranges = kcalloc(2 * num_ranges, sizeof(*voltage_ranges), GFP_KERNEL);
|
|
if (!voltage_ranges)
|
|
return -ENOMEM;
|
|
|
|
ret = device_property_read_u32_array(dev, prop, voltage_ranges, 2 * num_ranges);
|
|
if (ret) {
|
|
kfree(voltage_ranges);
|
|
return ret;
|
|
}
|
|
|
|
for (i = 0; i < num_ranges; i++) {
|
|
const int j = i * 2;
|
|
u32 ocr_mask;
|
|
|
|
ocr_mask = mmc_vddrange_to_ocrmask(voltage_ranges[j + 0],
|
|
voltage_ranges[j + 1]);
|
|
if (!ocr_mask) {
|
|
dev_err(dev, "range #%d in %s is invalid\n", i, prop);
|
|
kfree(voltage_ranges);
|
|
return -EINVAL;
|
|
}
|
|
*mask |= ocr_mask;
|
|
}
|
|
|
|
kfree(voltage_ranges);
|
|
|
|
return 1;
|
|
}
|
|
EXPORT_SYMBOL(mmc_of_parse_voltage);
|
|
|
|
/**
|
|
* mmc_first_nonreserved_index() - get the first index that is not reserved
|
|
*/
|
|
static int mmc_first_nonreserved_index(void)
|
|
{
|
|
int max;
|
|
|
|
max = of_alias_get_highest_id("mmc");
|
|
if (max < 0)
|
|
return 0;
|
|
|
|
return max + 1;
|
|
}
|
|
|
|
/**
|
|
* 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 index;
|
|
struct mmc_host *host;
|
|
int alias_id, min_idx, max_idx;
|
|
|
|
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;
|
|
|
|
alias_id = of_alias_get_id(dev->of_node, "mmc");
|
|
if (alias_id >= 0) {
|
|
index = alias_id;
|
|
} else {
|
|
min_idx = mmc_first_nonreserved_index();
|
|
max_idx = 0;
|
|
|
|
index = ida_simple_get(&mmc_host_ida, min_idx, max_idx, GFP_KERNEL);
|
|
if (index < 0) {
|
|
kfree(host);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
host->index = index;
|
|
|
|
dev_set_name(&host->class_dev, "mmc%d", host->index);
|
|
host->ws = wakeup_source_register(NULL, dev_name(&host->class_dev));
|
|
|
|
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);
|
|
INIT_WORK(&host->sdio_irq_work, sdio_irq_work);
|
|
timer_setup(&host->retune_timer, mmc_retune_timer, 0);
|
|
|
|
/*
|
|
* 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->fixed_drv_type = -EINVAL;
|
|
host->ios.power_delay_ms = 10;
|
|
host->ios.power_mode = MMC_POWER_UNDEFINED;
|
|
|
|
return host;
|
|
}
|
|
|
|
EXPORT_SYMBOL(mmc_alloc_host);
|
|
|
|
static int mmc_validate_host_caps(struct mmc_host *host)
|
|
{
|
|
struct device *dev = host->parent;
|
|
u32 caps = host->caps, caps2 = host->caps2;
|
|
|
|
if (caps & MMC_CAP_SDIO_IRQ && !host->ops->enable_sdio_irq) {
|
|
dev_warn(dev, "missing ->enable_sdio_irq() ops\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (caps2 & (MMC_CAP2_HS400_ES | MMC_CAP2_HS400) &&
|
|
!(caps & MMC_CAP_8_BIT_DATA) && !(caps2 & MMC_CAP2_NO_MMC)) {
|
|
dev_warn(dev, "drop HS400 support since no 8-bit bus\n");
|
|
host->caps2 = caps2 & ~MMC_CAP2_HS400_ES & ~MMC_CAP2_HS400;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
err = mmc_validate_host_caps(host);
|
|
if (err)
|
|
return err;
|
|
|
|
err = device_add(&host->class_dev);
|
|
if (err)
|
|
return err;
|
|
|
|
led_trigger_register_simple(dev_name(&host->class_dev), &host->led);
|
|
|
|
mmc_add_host_debugfs(host);
|
|
|
|
mmc_start_host(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)
|
|
{
|
|
mmc_stop_host(host);
|
|
|
|
mmc_remove_host_debugfs(host);
|
|
|
|
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);
|