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 People 6 * Copyright (C) 2008 Atmel 7 * 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 Pitre 17 * Created: Nov 30, 2004 18 * Copyright: (C) 2004 MontaVista Software, Inc. 19 */ 20 21 #ifndef _ATMEL_PCM_H 22 #define _ATMEL_PCM_H 23 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 */ 31 struct 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 39 struct 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 the 52 * PDC DMA operation. All fields except dma_intr_handler() are initialized 53 * by the interface. The dma_intr_handler() pointer is set by the PCM 54 * driver and called by the interface SSC interrupt handler if it is 55 * non-NULL. 56 */ 57 struct 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) 74 int atmel_pcm_pdc_platform_register(struct device *dev); 75 #else 76 static inline int atmel_pcm_pdc_platform_register(struct device *dev) 77 { 78 return 0; 79 } 80 #endif 81 82 #if IS_ENABLED(CONFIG_SND_ATMEL_SOC_DMA) 83 int atmel_pcm_dma_platform_register(struct device *dev); 84 #else 85 static inline int atmel_pcm_dma_platform_register(struct device *dev) 86 { 87 return 0; 88 } 89 #endif 90 91 #endif /* _ATMEL_PCM_H */ 92