LXR linux/sound/soc/atmel/atmel_ssc

   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
  82struct 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
  93struct 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
 108int atmel_ssc_set_audio(int ssc_id);
 109void atmel_ssc_put_audio(int ssc_id);
 110
 111#endif /* _AT91_SSC_DAI_H */
 112