ALSA: Add ALSA driver for Atmel AC97 controller

This patch adds ALSA support for the AC97 controller found on Atmel
AVR32 devices.

Tested on ATSTK1006 + ATSTK1000 with a development board with a AC97
codec.
Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

include/sound/atmel-ac97c.h

+/*
+ * Driver for the Atmel AC97C controller
+ *
+ * Copyright (C) 2005-2009 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+#ifndef __INCLUDE_SOUND_ATMEL_AC97C_H
+#define __INCLUDE_SOUND_ATMEL_AC97C_H
+
+#include <linux/dw_dmac.h>
+
+#define AC97C_CAPTURE	0x01
+#define AC97C_PLAYBACK	0x02
+#define AC97C_BOTH	(AC97C_CAPTURE | AC97C_PLAYBACK)
+
+/**
+ * struct atmel_ac97c_pdata - board specific AC97C configuration
+ * @rx_dws: DMA slave interface to use for sound capture.
+ * @tx_dws: DMA slave interface to use for sound playback.
+ * @reset_pin: GPIO pin wired to the reset input on the external AC97 codec,
+ *             optional to use, set to -ENODEV if not in use. AC97 layer will
+ *             try to do a software reset of the external codec anyway.
+ * @flags: Flags for which directions should be enabled.
+ *
+ * If the user do not want to use a DMA channel for playback or capture, i.e.
+ * only one feature is required on the board. The slave for playback or capture
+ * can be set to NULL. The AC97C driver will take use of this when setting up
+ * the sound streams.
+ */
+struct ac97c_platform_data {
+	struct dw_dma_slave	rx_dws;
+	struct dw_dma_slave	tx_dws;
+	unsigned int 		flags;
+	int			reset_pin;
+};
+
+#endif /* __INCLUDE_SOUND_ATMEL_AC97C_H */

sound/atmel/Kconfig

@@ -8,4 +8,12 @@ config SND_ATMEL_ABDAC
 	help
 	  ALSA sound driver for the Atmel Audio Bitstream DAC (ABDAC).
 
+config SND_ATMEL_AC97C
+	tristate "Atmel AC97 Controller (AC97C) driver"
+	select SND_PCM
+	select SND_AC97_CODEC
+	depends on DW_DMAC && AVR32
+	help
+	  ALSA sound driver for the Atmel AC97 controller.
+
 endmenu

sound/atmel/Makefile

 snd-atmel-abdac-objs		:= abdac.o
+snd-atmel-ac97c-objs		:= ac97c.o
 
 obj-$(CONFIG_SND_ATMEL_ABDAC)	+= snd-atmel-abdac.o
+obj-$(CONFIG_SND_ATMEL_AC97C)	+= snd-atmel-ac97c.o

sound/atmel/ac97c.h

+/*
+ * Register definitions for the Atmel AC97C controller
+ *
+ * Copyright (C) 2005-2009 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+#ifndef __SOUND_ATMEL_AC97C_H
+#define __SOUND_ATMEL_AC97C_H
+
+#define AC97C_MR		0x08
+#define AC97C_ICA		0x10
+#define AC97C_OCA		0x14
+#define AC97C_CARHR		0x20
+#define AC97C_CATHR		0x24
+#define AC97C_CASR		0x28
+#define AC97C_CAMR		0x2c
+#define AC97C_CBRHR		0x30
+#define AC97C_CBTHR		0x34
+#define AC97C_CBSR		0x38
+#define AC97C_CBMR		0x3c
+#define AC97C_CORHR		0x40
+#define AC97C_COTHR		0x44
+#define AC97C_COSR		0x48
+#define AC97C_COMR		0x4c
+#define AC97C_SR		0x50
+#define AC97C_IER		0x54
+#define AC97C_IDR		0x58
+#define AC97C_IMR		0x5c
+#define AC97C_VERSION		0xfc
+
+#define AC97C_CATPR		PDC_TPR
+#define AC97C_CATCR		PDC_TCR
+#define AC97C_CATNPR		PDC_TNPR
+#define AC97C_CATNCR		PDC_TNCR
+#define AC97C_CARPR		PDC_RPR
+#define AC97C_CARCR		PDC_RCR
+#define AC97C_CARNPR		PDC_RNPR
+#define AC97C_CARNCR		PDC_RNCR
+#define AC97C_PTCR		PDC_PTCR
+
+#define AC97C_MR_ENA		(1 << 0)
+#define AC97C_MR_WRST		(1 << 1)
+#define AC97C_MR_VRA		(1 << 2)
+
+#define AC97C_CSR_TXRDY		(1 << 0)
+#define AC97C_CSR_UNRUN		(1 << 2)
+#define AC97C_CSR_RXRDY		(1 << 4)
+#define AC97C_CSR_ENDTX		(1 << 10)
+#define AC97C_CSR_ENDRX		(1 << 14)
+
+#define AC97C_CMR_SIZE_20	(0 << 16)
+#define AC97C_CMR_SIZE_18	(1 << 16)
+#define AC97C_CMR_SIZE_16	(2 << 16)
+#define AC97C_CMR_SIZE_10	(3 << 16)
+#define AC97C_CMR_CEM_LITTLE	(1 << 18)
+#define AC97C_CMR_CEM_BIG	(0 << 18)
+#define AC97C_CMR_CENA		(1 << 21)
+#define AC97C_CMR_DMAEN		(1 << 22)
+
+#define AC97C_SR_CAEVT		(1 << 3)
+
+#define AC97C_CH_ASSIGN(slot, channel)					\
+	(AC97C_CHANNEL_##channel << (3 * (AC97_SLOT_##slot - 3)))
+#define AC97C_CHANNEL_NONE	0x0
+#define AC97C_CHANNEL_A		0x1
+#define AC97C_CHANNEL_B		0x2
+
+#endif /* __SOUND_ATMEL_AC97C_H */