The mmc core uses a PM notifier to temporarily during system suspend, turn off the card detection mechanism for removal/insertion of (e)MMC/SD/SDIO cards. Additionally, the notifier may be used to remove an SDIO card entirely, if a corresponding SDIO functional driver don't have the system suspend/resume callbacks assigned. This behaviour has been around for a very long time. However, a recent bug report tells us there are problems with this approach. More precisely, when receiving the PM_SUSPEND_PREPARE notification, we may end up hanging on I/O to be completed, thus also preventing the system from getting suspended. In the end what happens, is that the cancel_delayed_work_sync() in mmc_pm_notify() ends up waiting for mmc_rescan() to complete - and since mmc_rescan() wants to claim the host, it needs to wait for the I/O to be completed first. Typically, this problem is triggered in Android, if there is ongoing I/O while the user decides to suspend, resume and then suspend the system again. This due to that after the resume, an mmc_rescan() work gets punted to the workqueue, which job is to verify that the card remains inserted after the system has resumed. To fix this problem, userspace needs to become frozen to suspend the I/O, prior to turning off the card detection mechanism. Therefore, let's drop the PM notifiers for mmc subsystem altogether and rely on the card detection to be turned off/on as a part of the system_freezable_wq, that we are already using. Moreover, to allow and SDIO card to be removed during system suspend, let's manage this from a ->prepare() callback, assigned at the mmc_host_class level. In this way, we can use the parent device (the mmc_host_class device), to remove the card device that is the child, in the device_prepare() phase. Reported-by: Kiwoong Kim <kwmad.kim@samsung.com> Cc: stable@vger.kernel.org # v4.5+ Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Link: https://lore.kernel.org/r/20210310152900.149380-1-ulf.hansson@linaro.org Reviewed-by: Kiwoong Kim <kwmad.kim@samsung.com>
619 lines
16 KiB
C
619 lines
16 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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ida_simple_remove(&mmc_host_ida, host->index);
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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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.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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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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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-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, 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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/* 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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|
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EXPORT_SYMBOL(mmc_of_parse);
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|
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/**
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* mmc_of_parse_voltage - return mask of supported voltages
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* @np: The device node need to 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" DT 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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*/
|
|
int mmc_of_parse_voltage(struct device_node *np, u32 *mask)
|
|
{
|
|
const u32 *voltage_ranges;
|
|
int num_ranges, i;
|
|
|
|
voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
|
|
if (!voltage_ranges) {
|
|
pr_debug("%pOF: voltage-ranges unspecified\n", np);
|
|
return 0;
|
|
}
|
|
num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
|
|
if (!num_ranges) {
|
|
pr_err("%pOF: voltage-ranges empty\n", np);
|
|
return -EINVAL;
|
|
}
|
|
|
|
for (i = 0; i < num_ranges; i++) {
|
|
const int j = i * 2;
|
|
u32 ocr_mask;
|
|
|
|
ocr_mask = mmc_vddrange_to_ocrmask(
|
|
be32_to_cpu(voltage_ranges[j]),
|
|
be32_to_cpu(voltage_ranges[j + 1]));
|
|
if (!ocr_mask) {
|
|
pr_err("%pOF: voltage-range #%d is invalid\n",
|
|
np, i);
|
|
return -EINVAL;
|
|
}
|
|
*mask |= ocr_mask;
|
|
}
|
|
|
|
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 err;
|
|
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) {
|
|
min_idx = alias_id;
|
|
max_idx = alias_id + 1;
|
|
} else {
|
|
min_idx = mmc_first_nonreserved_index();
|
|
max_idx = 0;
|
|
}
|
|
|
|
err = ida_simple_get(&mmc_host_ida, min_idx, max_idx, GFP_KERNEL);
|
|
if (err < 0) {
|
|
kfree(host);
|
|
return NULL;
|
|
}
|
|
|
|
host->index = err;
|
|
|
|
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_DELAYED_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);
|
|
|
|
/**
|
|
* 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_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);
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
mmc_remove_host_debugfs(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);
|