Preliminary MMC stack. This stack supports SD 1.0 cards only, but

should be easily adapted to SD 2.0 (aka SDHC), SDIO, MMC and MMCplus
cards.  At the present time, there's only one bridge driver for the
ARM9 based Atmel AT91RM9200.

1 files changed, 105 insertions, 0 deletions

diff --git a/sys/dev/mmc/bridge.h b/sys/dev/mmc/bridge.h
new file mode 100644
index 000000000000..ddaaed8dc51a
--- /dev/null
+++ b/sys/dev/mmc/bridge.h
@@ -0,0 +1,105 @@
+/*-
+ * Copyright (c) 2006 M. Warner Losh.  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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef DEV_MMC_BRIDGE_H
+#define DEV_MMC_BRIDGE_H
+
+/*
+ * This file defines interfaces for the mmc bridge.  The names chosen
+ * are similar to or the same as the names used in Linux to allow for
+ * easy porting of what Linux calls mmc host drivers.  I use the
+ * FreeBSD terminology of bridge and bus for consistancy with other
+ * drivers in the system.  This file corresponds roughly to the Linux
+ * linux/mmc/host.h file.
+ *
+ * A mmc bridge is a chipset that can have one or more mmc and/or sd
+ * cards attached to it.  mmc cards are attached on a bus topology,
+ * while sd and sdio cards are attached using a star topology (meaning
+ * in practice each sd card has its own, independent slot).  Each
+ * mmcbr is assumed to be derived from the mmcbr.  This is done to
+ * allow for easier addition of bridges (as each bridge does not need
+ * to be added to the mmcbus file).
+ *
+ * Attached to the mmc bridge is an mmcbus.  The mmcbus is described
+ * in dev/mmc/bus.h.
+ */
+
+
+/*
+ * mmc_ios is a structure that is used to store the state of the mmc/sd
+ * bus configuration.  This include the bus' clock speed, its voltage,
+ * the bus mode for command output, the SPI chip select, some power
+ * states and the bus width.
+ */
+enum mmc_vdd {
+	vdd_150 = 0, vdd_155, vdd_160, vdd_165, vdd_170, vdd_180,
+	vdd_190, vdd_200, vdd_210, vdd_220, vdd_230, vdd_240, vdd_250,
+	vdd_260, vdd_270, vdd_280, vdd_290, vdd_300, vdd_310, vdd_320,
+	vdd_330, vdd_340, vdd_350, vdd_360
+};
+
+enum mmc_power_mode {
+	power_off = 0, power_up, power_on
+};
+
+enum mmc_bus_mode {
+	opendrain = 1, pushpull
+};
+
+enum mmc_chip_select {
+	cs_dontcare = 0, cs_high, cs_low
+};
+
+enum mmc_bus_width {
+	bus_width_1 = 0, bus_width_4 = 2, bus_width_8 = 3
+};
+
+struct mmc_ios {
+	uint32_t	clock;	/* Speed of the clock in Hz to move data */
+	enum mmc_vdd	vdd;	/* Voltage to apply to the power pins/ */
+	enum mmc_bus_mode bus_mode;
+	enum mmc_chip_select chip_select;
+	enum mmc_bus_width bus_width;
+	enum mmc_power_mode power_mode;
+};
+
+enum mmc_card_mode {
+	mode_mmc, mode_sd
+};
+
+struct mmc_host {
+	int f_min;
+	int f_max;
+	uint32_t host_ocr;
+	uint32_t ocr;
+	uint32_t caps;
+#define MMC_CAP_4_BIT_DATA	(1 << 0) /* Can do 4-bit data transfers */
+#define MMC_CAP_8_BIT_DATA	(1 << 1) /* Can do 8-bit data transfers */
+	enum mmc_card_mode mode;
+	struct mmc_ios ios;	/* Current state of the host */
+};
+
+#endif /* DEV_MMC_BRIDGE_H */