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System on chip designs may specify a specific MMC power sequence. To successfully detect an (e)MMC/SD/SDIO card, that power sequence must be followed while initializing the card. To be able to handle these SOC specific power sequences, let's add a MMC power sequence interface. It provides the following functions to help the mmc core to deal with these power sequences. mmc_pwrseq_alloc() - Invoked from mmc_of_parse(), to initialize data. mmc_pwrseq_pre_power_on()- Invoked in the beginning of mmc_power_up(). mmc_pwrseq_post_power_on()- Invoked at the end in mmc_power_up(). mmc_pwrseq_power_off()- Invoked from mmc_power_off(). mmc_pwrseq_free() - Invoked from mmc_free_host(), to free data. Each MMC power sequence provider will be responsible to implement a set of callbacks. These callbacks mirrors the functions above. This patch adds the skeleton, following patches will extend the core of the MMC power sequence and add support for a specific simple MMC power sequence. Do note, since the mmc_pwrseq_alloc() is invoked from mmc_of_parse(), host drivers needs to make use of this API to enable the support for MMC power sequences. Moreover the MMC power sequence support depends on CONFIG_OF. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk> Reviewed-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
41 lines
1.1 KiB
C
41 lines
1.1 KiB
C
/*
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* Copyright (C) 2014 Linaro Ltd
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*
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* Author: Ulf Hansson <ulf.hansson@linaro.org>
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*
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* License terms: GNU General Public License (GPL) version 2
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*/
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#ifndef _MMC_CORE_PWRSEQ_H
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#define _MMC_CORE_PWRSEQ_H
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struct mmc_pwrseq_ops {
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void (*pre_power_on)(struct mmc_host *host);
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void (*post_power_on)(struct mmc_host *host);
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void (*power_off)(struct mmc_host *host);
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void (*free)(struct mmc_host *host);
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};
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struct mmc_pwrseq {
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struct mmc_pwrseq_ops *ops;
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};
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#ifdef CONFIG_OF
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int mmc_pwrseq_alloc(struct mmc_host *host);
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void mmc_pwrseq_pre_power_on(struct mmc_host *host);
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void mmc_pwrseq_post_power_on(struct mmc_host *host);
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void mmc_pwrseq_power_off(struct mmc_host *host);
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void mmc_pwrseq_free(struct mmc_host *host);
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#else
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static inline int mmc_pwrseq_alloc(struct mmc_host *host) { return 0; }
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static inline void mmc_pwrseq_pre_power_on(struct mmc_host *host) {}
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static inline void mmc_pwrseq_post_power_on(struct mmc_host *host) {}
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static inline void mmc_pwrseq_power_off(struct mmc_host *host) {}
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static inline void mmc_pwrseq_free(struct mmc_host *host) {}
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#endif
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#endif
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