Import BBB sd driver files from FreeBSD.

1 files changed, 69 insertions, 0 deletions

diff --git a/freebsd/sys/dev/sdhci/sdhci_fdt_gpio.h b/freebsd/sys/dev/sdhci/sdhci_fdt_gpio.h
new file mode 100644
index 00000000..6d51737b
--- /dev/null
+++ b/freebsd/sys/dev/sdhci/sdhci_fdt_gpio.h
@@ -0,0 +1,69 @@
+/*-
+ * Copyright (c) 2017 Ian Lepore <ian@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+/*
+ * Support routines usable by any SoC sdhci bridge driver that uses gpio pins
+ * for card detect and/or write protect, and uses FDT data to describe those
+ * pins.  A bridge driver need only supply a couple 2-line forwarding functions
+ * to connect the get_present and get_readonly accessors to the corresponding
+ * driver interface functions, and add setup/teardown calls to its attach and
+ * detach functions.
+ */
+
+#ifndef	_SDHCI_FDT_GPIO_H_
+#define	_SDHCI_FDT_GPIO_H_
+
+struct sdhci_slot;
+struct sdhci_fdt_gpio;
+
+/*
+ * sdhci_fdt_gpio_setup()
+ * sdhci_fdt_gpio_teardown()
+ *
+ * Process FDT properties that use gpio pins and set up interrupt handling (if
+ * supported by hardware) and accessor functions to read the pins.
+ *
+ * Setup cannot fail.  If the properties are not present, the accessors will
+ * return the values from standard sdhci registers.  If the gpio controller
+ * can't trigger interrupts on both edges, it configures the slot to use polling
+ * for card presence detection.  If it can't access the gpio pin at all it sets
+ * up the get_present() accessor to always return true.  Likewise the
+ * get_readonly() accessor always returns false if its pin can't be accessed.
+ */
+struct sdhci_fdt_gpio *sdhci_fdt_gpio_setup(device_t dev, struct sdhci_slot *slot);
+void sdhci_fdt_gpio_teardown(struct sdhci_fdt_gpio *gpio);
+
+/*
+ * sdhci_fdt_gpio_get_present()
+ * sdhci_fdt_gpio_get_readonly()
+ *
+ * Gpio pin state accessor functions.
+ */
+bool sdhci_fdt_gpio_get_present(struct sdhci_fdt_gpio *gpio);
+int  sdhci_fdt_gpio_get_readonly(struct sdhci_fdt_gpio *gpio);
+
+#endif