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648 lines
17 KiB
648 lines
17 KiB
// 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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|
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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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/* |
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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 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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/** |
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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 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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/** |
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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) |
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{ |
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const char *prop = "voltage-ranges"; |
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struct device *dev = host->parent; |
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u32 *voltage_ranges; |
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int num_ranges, i; |
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int ret; |
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if (!device_property_present(dev, prop)) { |
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dev_dbg(dev, "%s unspecified\n", prop); |
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return 0; |
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} |
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ret = device_property_count_u32(dev, prop); |
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if (ret < 0) |
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return ret; |
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num_ranges = ret / 2; |
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if (!num_ranges) { |
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dev_err(dev, "%s empty\n", prop); |
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return -EINVAL; |
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} |
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voltage_ranges = kcalloc(2 * num_ranges, sizeof(*voltage_ranges), GFP_KERNEL); |
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if (!voltage_ranges) |
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return -ENOMEM; |
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ret = device_property_read_u32_array(dev, prop, voltage_ranges, 2 * num_ranges); |
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if (ret) { |
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kfree(voltage_ranges); |
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return ret; |
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} |
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for (i = 0; i < num_ranges; i++) { |
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const int j = i * 2; |
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u32 ocr_mask; |
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ocr_mask = mmc_vddrange_to_ocrmask(voltage_ranges[j + 0], |
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voltage_ranges[j + 1]); |
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if (!ocr_mask) { |
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dev_err(dev, "range #%d in %s is invalid\n", i, prop); |
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kfree(voltage_ranges); |
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return -EINVAL; |
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} |
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*mask |= ocr_mask; |
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} |
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kfree(voltage_ranges); |
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return 1; |
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} |
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EXPORT_SYMBOL(mmc_of_parse_voltage); |
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|
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/** |
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* mmc_first_nonreserved_index() - get the first index that is not reserved |
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*/ |
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static int mmc_first_nonreserved_index(void) |
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{ |
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int max; |
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max = of_alias_get_highest_id("mmc"); |
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if (max < 0) |
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return 0; |
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|
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return max + 1; |
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} |
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|
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/** |
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* mmc_alloc_host - initialise the per-host structure. |
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* @extra: sizeof private data structure |
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* @dev: pointer to host device model structure |
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* |
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* Initialise the per-host structure. |
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*/ |
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struct mmc_host *mmc_alloc_host(int extra, struct device *dev) |
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{ |
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int index; |
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struct mmc_host *host; |
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int alias_id, min_idx, max_idx; |
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|
|
host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL); |
|
if (!host) |
|
return NULL; |
|
|
|
/* scanning will be enabled when we're ready */ |
|
host->rescan_disable = 1; |
|
|
|
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_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);
|
|
|