1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * atmel_ssc_dai.h - ALSA SSC interface for the Atmel SoC 4 * 5 * Copyright (C) 2005 SAN People 6 * Copyright (C) 2008 Atmel 7 * 8 * Author: Sedji Gaouaou <sedji.gaouaou@atmel.com> 9 * ATMEL CORP. 10 * 11 * Based on at91-ssc.c by 12 * Frank Mandarino <fmandarino@endrelia.com> 13 * Based on pxa2xx Platform drivers by 14 * Liam Girdwood <lrg@slimlogic.co.uk> 15 */ 16 17 #ifndef _ATMEL_SSC_DAI_H 18 #define _ATMEL_SSC_DAI_H 19 20 #include <linux/types.h> 21 #include <linux/atmel-ssc.h> 22 23 #include "atmel-pcm.h" 24 25 /* SSC system clock ids */ 26 #define ATMEL_SYSCLK_MCK 0 /* SSC uses AT91 MCK as system clock */ 27 28 /* SSC divider ids */ 29 #define ATMEL_SSC_CMR_DIV 0 /* MCK divider for BCLK */ 30 #define ATMEL_SSC_TCMR_PERIOD 1 /* BCLK divider for transmit FS */ 31 #define ATMEL_SSC_RCMR_PERIOD 2 /* BCLK divider for receive FS */ 32 /* 33 * SSC direction masks 34 */ 35 #define SSC_DIR_MASK_UNUSED 0 36 #define SSC_DIR_MASK_PLAYBACK 1 37 #define SSC_DIR_MASK_CAPTURE 2 38 39 /* 40 * SSC register values that Atmel left out of <linux/atmel-ssc.h>. These 41 * are expected to be used with SSC_BF 42 */ 43 /* START bit field values */ 44 #define SSC_START_CONTINUOUS 0 45 #define SSC_START_TX_RX 1 46 #define SSC_START_LOW_RF 2 47 #define SSC_START_HIGH_RF 3 48 #define SSC_START_FALLING_RF 4 49 #define SSC_START_RISING_RF 5 50 #define SSC_START_LEVEL_RF 6 51 #define SSC_START_EDGE_RF 7 52 #define SSS_START_COMPARE_0 8 53 54 /* CKI bit field values */ 55 #define SSC_CKI_FALLING 0 56 #define SSC_CKI_RISING 1 57 58 /* CKO bit field values */ 59 #define SSC_CKO_NONE 0 60 #define SSC_CKO_CONTINUOUS 1 61 #define SSC_CKO_TRANSFER 2 62 63 /* CKS bit field values */ 64 #define SSC_CKS_DIV 0 65 #define SSC_CKS_CLOCK 1 66 #define SSC_CKS_PIN 2 67 68 /* FSEDGE bit field values */ 69 #define SSC_FSEDGE_POSITIVE 0 70 #define SSC_FSEDGE_NEGATIVE 1 71 72 /* FSOS bit field values */ 73 #define SSC_FSOS_NONE 0 74 #define SSC_FSOS_NEGATIVE 1 75 #define SSC_FSOS_POSITIVE 2 76 #define SSC_FSOS_LOW 3 77 #define SSC_FSOS_HIGH 4 78 #define SSC_FSOS_TOGGLE 5 79 80 #define START_DELAY 1 81 82 struct atmel_ssc_state { 83 u32 ssc_cmr; 84 u32 ssc_rcmr; 85 u32 ssc_rfmr; 86 u32 ssc_tcmr; 87 u32 ssc_tfmr; 88 u32 ssc_sr; 89 u32 ssc_imr; 90 }; 91 92 93 struct atmel_ssc_info { 94 char *name; 95 struct ssc_device *ssc; 96 unsigned short dir_mask; /* 0=unused, 1=playback, 2=capture */ 97 unsigned short initialized; /* true if SSC has been initialized */ 98 unsigned short daifmt; 99 unsigned short cmr_div; 100 unsigned short tcmr_period; 101 unsigned short rcmr_period; 102 unsigned int forced_divider; 103 struct atmel_pcm_dma_params *dma_params[2]; 104 struct atmel_ssc_state ssc_state; 105 unsigned long mck_rate; 106 }; 107 108 int atmel_ssc_set_audio(int ssc_id); 109 void atmel_ssc_put_audio(int ssc_id); 110 111 #endif /* _AT91_SSC_DAI_H */ 112