70 lines
2.9 KiB
C
70 lines
2.9 KiB
C
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/*-
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* Copyright (c) 2017 Ian Lepore <ian@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* Support routines usable by any SoC sdhci bridge driver that uses gpio pins
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* for card detect and/or write protect, and uses FDT data to describe those
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* pins. A bridge driver need only supply a couple 2-line forwarding functions
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* to connect the get_present and get_readonly accessors to the corresponding
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* driver interface functions, and add setup/teardown calls to its attach and
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* detach functions.
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*/
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#ifndef _SDHCI_FDT_GPIO_H_
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#define _SDHCI_FDT_GPIO_H_
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struct sdhci_slot;
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struct sdhci_fdt_gpio;
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/*
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* sdhci_fdt_gpio_setup()
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* sdhci_fdt_gpio_teardown()
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*
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* Process FDT properties that use gpio pins and set up interrupt handling (if
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* supported by hardware) and accessor functions to read the pins.
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*
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* Setup cannot fail. If the properties are not present, the accessors will
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* return the values from standard sdhci registers. If the gpio controller
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* can't trigger interrupts on both edges, it configures the slot to use polling
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* for card presence detection. If it can't access the gpio pin at all it sets
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* up the get_present() accessor to always return true. Likewise the
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* get_readonly() accessor always returns false if its pin can't be accessed.
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*/
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struct sdhci_fdt_gpio *sdhci_fdt_gpio_setup(device_t dev, struct sdhci_slot *slot);
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void sdhci_fdt_gpio_teardown(struct sdhci_fdt_gpio *gpio);
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/*
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* sdhci_fdt_gpio_get_present()
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* sdhci_fdt_gpio_get_readonly()
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*
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* Gpio pin state accessor functions.
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*/
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bool sdhci_fdt_gpio_get_present(struct sdhci_fdt_gpio *gpio);
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int sdhci_fdt_gpio_get_readonly(struct sdhci_fdt_gpio *gpio);
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#endif
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