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1/* SPDX-License-Identifier: GPL-2.0-or-later */2/*3 * at91-pcm.h - ALSA PCM interface for the Atmel AT91 SoC.4 *5 * Copyright (C) 2005 SAN People6 * Copyright (C) 2008 Atmel7 *8 * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>9 *10 * Based on at91-pcm. by:11 * Frank Mandarino <fmandarino@endrelia.com>12 * Copyright 2006 Endrelia Technologies Inc.13 *14 * Based on pxa2xx-pcm.c by:15 *16 * Author: Nicolas Pitre17 * Created: Nov 30, 200418 * Copyright: (C) 2004 MontaVista Software, Inc.19 */20 21#ifndef _ATMEL_PCM_H22#define _ATMEL_PCM_H23 24#include <linux/atmel-ssc.h>25 26#define ATMEL_SSC_DMABUF_SIZE (64 * 1024)27 28/*29 * Registers and status bits that are required by the PCM driver.30 */31struct atmel_pdc_regs {32 unsigned int xpr; /* PDC recv/trans pointer */33 unsigned int xcr; /* PDC recv/trans counter */34 unsigned int xnpr; /* PDC next recv/trans pointer */35 unsigned int xncr; /* PDC next recv/trans counter */36 unsigned int ptcr; /* PDC transfer control */37};38 39struct atmel_ssc_mask {40 u32 ssc_enable; /* SSC recv/trans enable */41 u32 ssc_disable; /* SSC recv/trans disable */42 u32 ssc_error; /* SSC error conditions */43 u32 ssc_endx; /* SSC ENDTX or ENDRX */44 u32 ssc_endbuf; /* SSC TXBUFE or RXBUFF */45 u32 pdc_enable; /* PDC recv/trans enable */46 u32 pdc_disable; /* PDC recv/trans disable */47};48 49/*50 * This structure, shared between the PCM driver and the interface,51 * contains all information required by the PCM driver to perform the52 * PDC DMA operation. All fields except dma_intr_handler() are initialized53 * by the interface. The dma_intr_handler() pointer is set by the PCM54 * driver and called by the interface SSC interrupt handler if it is55 * non-NULL.56 */57struct atmel_pcm_dma_params {58 char *name; /* stream identifier */59 int pdc_xfer_size; /* PDC counter increment in bytes */60 struct ssc_device *ssc; /* SSC device for stream */61 struct atmel_pdc_regs *pdc; /* PDC receive or transmit registers */62 struct atmel_ssc_mask *mask; /* SSC & PDC status bits */63 struct snd_pcm_substream *substream;64 void (*dma_intr_handler)(u32, struct snd_pcm_substream *);65};66 67/*68 * SSC register access (since ssc_writel() / ssc_readl() require literal name)69 */70#define ssc_readx(base, reg) (__raw_readl((base) + (reg)))71#define ssc_writex(base, reg, value) __raw_writel((value), (base) + (reg))72 73#if IS_ENABLED(CONFIG_SND_ATMEL_SOC_PDC)74int atmel_pcm_pdc_platform_register(struct device *dev);75#else76static inline int atmel_pcm_pdc_platform_register(struct device *dev)77{78 return 0;79}80#endif81 82#if IS_ENABLED(CONFIG_SND_ATMEL_SOC_DMA)83int atmel_pcm_dma_platform_register(struct device *dev);84#else85static inline int atmel_pcm_dma_platform_register(struct device *dev)86{87 return 0;88}89#endif90 91#endif /* _ATMEL_PCM_H */92