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diff --git a/sound/sh/aica.h b/sound/sh/aica.h
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+/* SPDX-License-Identifier: GPL-2.0-only */
+/* aica.h
+ * Header file for ALSA driver for
+ * Sega Dreamcast Yamaha AICA sound
+ * Copyright Adrian McMenamin
+ * <adrian@mcmen.demon.co.uk>
+ * 2006
+ */
+
+/* SPU memory and register constants etc */
+#define G2_FIFO 0xa05f688c
+#define SPU_MEMORY_BASE 0xA0800000
+#define ARM_RESET_REGISTER 0xA0702C00
+#define SPU_REGISTER_BASE 0xA0700000
+
+/* AICA channels stuff */
+#define AICA_CONTROL_POINT 0xA0810000
+#define AICA_CONTROL_CHANNEL_SAMPLE_NUMBER 0xA0810008
+#define AICA_CHANNEL0_CONTROL_OFFSET 0x10004
+
+/* Command values */
+#define AICA_CMD_KICK 0x80000000
+#define AICA_CMD_NONE 0
+#define AICA_CMD_START 1
+#define AICA_CMD_STOP 2
+#define AICA_CMD_VOL 3
+
+/* Sound modes */
+#define SM_8BIT 1
+#define SM_16BIT 0
+#define SM_ADPCM 2
+
+/* Buffer and period size */
+#define AICA_BUFFER_SIZE 0x8000
+#define AICA_PERIOD_SIZE 0x800
+#define AICA_PERIOD_NUMBER 16
+
+#define AICA_CHANNEL0_OFFSET 0x11000
+#define AICA_CHANNEL1_OFFSET 0x21000
+#define CHANNEL_OFFSET 0x10000
+
+#define AICA_DMA_CHANNEL 5
+#define AICA_DMA_MODE 5
+
+#define SND_AICA_DRIVER "AICA"
+
+struct aica_channel {
+ uint32_t cmd; /* Command ID */
+ uint32_t pos; /* Sample position */
+ uint32_t length; /* Sample length */
+ uint32_t freq; /* Frequency */
+ uint32_t vol; /* Volume 0-255 */
+ uint32_t pan; /* Pan 0-255 */
+ uint32_t sfmt; /* Sound format */
+ uint32_t flags; /* Bit flags */
+};
+
+struct snd_card_aica {
+ struct work_struct spu_dma_work;
+ struct snd_card *card;
+ struct aica_channel *channel;
+ struct snd_pcm_substream *substream;
+ int clicks;
+ int current_period;
+ struct timer_list timer;
+ int master_volume;
+ int dma_check;
+};