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diff --git a/qemu/include/hw/sd.h b/qemu/include/hw/sd.h
new file mode 100644
index 000000000..79adb5bb4
--- /dev/null
+++ b/qemu/include/hw/sd.h
@@ -0,0 +1,80 @@
+/*
+ * SD Memory Card emulation.  Mostly correct for MMC too.
+ *
+ * Copyright (c) 2006 Andrzej Zaborowski  <balrog@zabor.org>
+ *
+ * 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 AND CONTRIBUTORS ``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 OR
+ * CONTRIBUTORS 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.
+ */
+#ifndef __hw_sd_h
+#define __hw_sd_h		1
+
+#define OUT_OF_RANGE		(1 << 31)
+#define ADDRESS_ERROR		(1 << 30)
+#define BLOCK_LEN_ERROR		(1 << 29)
+#define ERASE_SEQ_ERROR		(1 << 28)
+#define ERASE_PARAM		(1 << 27)
+#define WP_VIOLATION		(1 << 26)
+#define CARD_IS_LOCKED		(1 << 25)
+#define LOCK_UNLOCK_FAILED	(1 << 24)
+#define COM_CRC_ERROR		(1 << 23)
+#define ILLEGAL_COMMAND		(1 << 22)
+#define CARD_ECC_FAILED		(1 << 21)
+#define CC_ERROR		(1 << 20)
+#define SD_ERROR		(1 << 19)
+#define CID_CSD_OVERWRITE	(1 << 16)
+#define WP_ERASE_SKIP		(1 << 15)
+#define CARD_ECC_DISABLED	(1 << 14)
+#define ERASE_RESET		(1 << 13)
+#define CURRENT_STATE		(7 << 9)
+#define READY_FOR_DATA		(1 << 8)
+#define APP_CMD			(1 << 5)
+#define AKE_SEQ_ERROR		(1 << 3)
+#define OCR_CCS_BITN        30
+
+typedef enum {
+    sd_none = -1,
+    sd_bc = 0,	/* broadcast -- no response */
+    sd_bcr,	/* broadcast with response */
+    sd_ac,	/* addressed -- no data transfer */
+    sd_adtc,	/* addressed with data transfer */
+} sd_cmd_type_t;
+
+typedef struct {
+    uint8_t cmd;
+    uint32_t arg;
+    uint8_t crc;
+} SDRequest;
+
+typedef struct SDState SDState;
+
+SDState *sd_init(BlockBackend *bs, bool is_spi);
+int sd_do_command(SDState *sd, SDRequest *req,
+                  uint8_t *response);
+void sd_write_data(SDState *sd, uint8_t value);
+uint8_t sd_read_data(SDState *sd);
+void sd_set_cb(SDState *sd, qemu_irq readonly, qemu_irq insert);
+bool sd_data_ready(SDState *sd);
+void sd_enable(SDState *sd, bool enable);
+
+#endif	/* __hw_sd_h */