| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame] | 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 */ |