Add imxspi(4), a driver for the i.MX SPI controller. This is the first

SPI controller in our tree.  Add a basic generic SPI infrastructure as
well.

ok kettenis@

1 files changed, 53 insertions, 0 deletions

diff --git a/sys/dev/spi/spivar.h b/sys/dev/spi/spivar.h
new file mode 100644
index 00000000000..986bc7f602d
--- /dev/null
+++ b/sys/dev/spi/spivar.h
@@ -0,0 +1,53 @@
+/* $OpenBSD: spivar.h,v 1.1 2018/07/26 10:59:07 patrick Exp $ */
+/*
+ * Copyright (c) 2018 Patrick Wildt <patrick@blueri.se>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+struct spi_config {
+	int		 sc_cs;
+	int		 sc_flags;
+#define SPI_CONFIG_CPOL		(1 << 0)
+#define SPI_CONFIG_CPHA		(1 << 1)
+#define SPI_CONFIG_CS_HIGH	(1 << 2)
+	int		 sc_bpw;
+	uint32_t	 sc_freq;
+};
+
+typedef struct spi_controller {
+	void			*sc_cookie;
+	void			(*sc_config)(void *, struct spi_config *);
+	int			(*sc_transfer)(void *, char *, char *, int);
+	int			(*sc_acquire_bus)(void *, int);
+	void			(*sc_release_bus)(void *, int);
+} *spi_tag_t;
+
+struct spi_attach_args {
+	spi_tag_t	 sa_tag;
+	char		*sa_name;
+	void		*sa_cookie;
+};
+
+#define	spi_config(sc, config)						\
+	(*(sc)->sc_config)((sc)->sc_cookie, (config))
+#define	spi_read(sc, data, len)						\
+	(*(sc)->sc_transfer)((sc)->sc_cookie, NULL, (data), (len))
+#define	spi_write(sc, data, len)					\
+	(*(sc)->sc_transfer)((sc)->sc_cookie, (data), NULL, (len))
+#define	spi_transfer(sc, out, in, len)					\
+	(*(sc)->sc_transfer)((sc)->sc_cookie, (out), (in), (len))
+#define	spi_acquire_bus(sc, flags)					\
+	(*(sc)->sc_acquire_bus)((sc)->sc_cookie, (flags))
+#define	spi_release_bus(sc, flags)					\
+	(*(sc)->sc_release_bus)((sc)->sc_cookie, (flags))