80 lines
2.2 KiB
C
80 lines
2.2 KiB
C
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/* sound/soc/at32/at32-pcm.h
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* ASoC PCM interface for Atmel AT32 SoC
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*
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* Copyright (C) 2008 Long Range Systems
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* Geoffrey Wossum <gwossum@acm.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __SOUND_SOC_AT32_AT32_PCM_H
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#define __SOUND_SOC_AT32_AT32_PCM_H __FILE__
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#include <linux/atmel-ssc.h>
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/*
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* Registers and status bits that are required by the PCM driver
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* TODO: Is ptcr really used?
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*/
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struct at32_pdc_regs {
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u32 xpr; /* PDC RX/TX pointer */
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u32 xcr; /* PDC RX/TX counter */
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u32 xnpr; /* PDC next RX/TX pointer */
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u32 xncr; /* PDC next RX/TX counter */
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u32 ptcr; /* PDC transfer control */
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};
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/*
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* SSC mask info
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*/
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struct at32_ssc_mask {
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u32 ssc_enable; /* SSC RX/TX enable */
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u32 ssc_disable; /* SSC RX/TX disable */
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u32 ssc_endx; /* SSC ENDTX or ENDRX */
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u32 ssc_endbuf; /* SSC TXBUFF or RXBUFF */
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u32 pdc_enable; /* PDC RX/TX enable */
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u32 pdc_disable; /* PDC RX/TX disable */
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};
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/*
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* This structure, shared between the PCM driver and the interface,
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* contains all information required by the PCM driver to perform the
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* PDC DMA operation. All fields except dma_intr_handler() are initialized
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* by the interface. The dms_intr_handler() pointer is set by the PCM
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* driver and called by the interface SSC interrupt handler if it is
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* non-NULL.
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*/
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struct at32_pcm_dma_params {
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char *name; /* stream identifier */
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int pdc_xfer_size; /* PDC counter increment in bytes */
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struct ssc_device *ssc; /* SSC device for stream */
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struct at32_pdc_regs *pdc; /* PDC register info */
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struct at32_ssc_mask *mask; /* SSC mask info */
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struct snd_pcm_substream *substream;
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void (*dma_intr_handler) (u32, struct snd_pcm_substream *);
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};
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/*
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* The AT32 ASoC platform driver
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*/
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extern struct snd_soc_platform at32_soc_platform;
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/*
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* SSC register access (since ssc_writel() / ssc_readl() require literal name)
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*/
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#define ssc_readx(base, reg) (__raw_readl((base) + (reg)))
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#define ssc_writex(base, reg, value) __raw_writel((value), (base) + (reg))
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#endif /* __SOUND_SOC_AT32_AT32_PCM_H */
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