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91 lines
2.7 KiB
91 lines
2.7 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* at91-pcm.h - ALSA PCM interface for the Atmel AT91 SoC. |
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* |
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* Copyright (C) 2005 SAN People |
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* Copyright (C) 2008 Atmel |
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* |
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* Authors: Sedji Gaouaou <[email protected]> |
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* |
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* Based on at91-pcm. by: |
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* Frank Mandarino <[email protected]> |
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* Copyright 2006 Endrelia Technologies Inc. |
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* |
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* Based on pxa2xx-pcm.c by: |
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* |
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* Author: Nicolas Pitre |
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* Created: Nov 30, 2004 |
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* Copyright: (C) 2004 MontaVista Software, Inc. |
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*/ |
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#ifndef _ATMEL_PCM_H |
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#define _ATMEL_PCM_H |
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#include <linux/atmel-ssc.h> |
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#define ATMEL_SSC_DMABUF_SIZE (64 * 1024) |
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/* |
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* Registers and status bits that are required by the PCM driver. |
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*/ |
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struct atmel_pdc_regs { |
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unsigned int xpr; /* PDC recv/trans pointer */ |
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unsigned int xcr; /* PDC recv/trans counter */ |
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unsigned int xnpr; /* PDC next recv/trans pointer */ |
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unsigned int xncr; /* PDC next recv/trans counter */ |
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unsigned int ptcr; /* PDC transfer control */ |
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}; |
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struct atmel_ssc_mask { |
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u32 ssc_enable; /* SSC recv/trans enable */ |
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u32 ssc_disable; /* SSC recv/trans disable */ |
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u32 ssc_error; /* SSC error conditions */ |
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u32 ssc_endx; /* SSC ENDTX or ENDRX */ |
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u32 ssc_endbuf; /* SSC TXBUFE or RXBUFF */ |
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u32 pdc_enable; /* PDC recv/trans enable */ |
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u32 pdc_disable; /* PDC recv/trans 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 dma_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 atmel_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 atmel_pdc_regs *pdc; /* PDC receive or transmit registers */ |
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struct atmel_ssc_mask *mask; /* SSC & PDC status bits */ |
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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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* 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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#if IS_ENABLED(CONFIG_SND_ATMEL_SOC_PDC) |
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int atmel_pcm_pdc_platform_register(struct device *dev); |
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#else |
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static inline int atmel_pcm_pdc_platform_register(struct device *dev) |
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{ |
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return 0; |
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} |
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#endif |
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#if IS_ENABLED(CONFIG_SND_ATMEL_SOC_DMA) |
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int atmel_pcm_dma_platform_register(struct device *dev); |
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#else |
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static inline int atmel_pcm_dma_platform_register(struct device *dev) |
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{ |
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return 0; |
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} |
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#endif |
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#endif /* _ATMEL_PCM_H */
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