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6abaa0c9fe
Since many have the system root on MMC/SD we must allow some foot shooting when it comes to resume. We cannot detect if a card is removed and reinserted during suspend, so the safe approach would be to assume it was, avoiding potential filesystem corruption. This will of course not work if you cannot release the card before suspend. This commit adds a compile time option that makes the MMC layer assume the card wasn't touched if it is redetected upon resume. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
/*
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* linux/drivers/mmc/core/core.h
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*
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* Copyright (C) 2003 Russell King, All Rights Reserved.
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* Copyright 2007 Pierre Ossman
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _MMC_CORE_CORE_H
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#define _MMC_CORE_CORE_H
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#include <linux/delay.h>
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#define MMC_CMD_RETRIES 3
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struct mmc_bus_ops {
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void (*remove)(struct mmc_host *);
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void (*detect)(struct mmc_host *);
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void (*suspend)(struct mmc_host *);
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void (*resume)(struct mmc_host *);
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};
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void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops);
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void mmc_detach_bus(struct mmc_host *host);
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void __mmc_release_bus(struct mmc_host *host);
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static inline void mmc_bus_get(struct mmc_host *host)
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{
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unsigned long flags;
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spin_lock_irqsave(&host->lock, flags);
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host->bus_refs++;
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spin_unlock_irqrestore(&host->lock, flags);
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}
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static inline void mmc_bus_put(struct mmc_host *host)
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{
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unsigned long flags;
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spin_lock_irqsave(&host->lock, flags);
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host->bus_refs--;
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if ((host->bus_refs == 0) && host->bus_ops)
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__mmc_release_bus(host);
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spin_unlock_irqrestore(&host->lock, flags);
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}
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void mmc_set_chip_select(struct mmc_host *host, int mode);
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void mmc_set_clock(struct mmc_host *host, unsigned int hz);
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void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode);
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void mmc_set_bus_width(struct mmc_host *host, unsigned int width);
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u32 mmc_select_voltage(struct mmc_host *host, u32 ocr);
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void mmc_set_timing(struct mmc_host *host, unsigned int timing);
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struct mmc_card *mmc_alloc_card(struct mmc_host *host);
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static inline void mmc_delay(unsigned int ms)
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{
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if (ms < 1000 / HZ) {
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cond_resched();
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mdelay(ms);
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} else {
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msleep(ms);
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}
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}
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#endif
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