soundbus/i2sbus/i2sbus.h

0001 /* SPDX-License-Identifier: GPL-2.0-only */
0002 /*
0003  * i2sbus driver -- private definitions
0004  *
0005  * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
0006  */
0007 #ifndef __I2SBUS_H
0008 #define __I2SBUS_H
0009 #include <linux/interrupt.h>
0010 #include <linux/spinlock.h>
0011 #include <linux/mutex.h>
0012 #include <linux/completion.h>
0013
0014 #include <sound/pcm.h>
0015
0016 #include <asm/prom.h>
0017 #include <asm/pmac_feature.h>
0018 #include <asm/dbdma.h>
0019
0020 #include "interface.h"
0021 #include "../soundbus.h"
0022
0023 struct i2sbus_control {
0024     struct list_head list;
0025     struct macio_chip *macio;
0026 };
0027
0028 #define MAX_DBDMA_COMMANDS  32
0029
0030 struct dbdma_command_mem {
0031     dma_addr_t bus_addr;
0032     dma_addr_t bus_cmd_start;
0033     struct dbdma_cmd *cmds;
0034     void *space;
0035     int size;
0036     u32 running:1;
0037     u32 stopping:1;
0038 };
0039
0040 struct pcm_info {
0041     u32 created:1, /* has this direction been created with alsa? */
0042         active:1;  /* is this stream active? */
0043     /* runtime information */
0044     struct snd_pcm_substream *substream;
0045     int current_period;
0046     u32 frame_count;
0047     struct dbdma_command_mem dbdma_ring;
0048     volatile struct dbdma_regs __iomem *dbdma;
0049     struct completion *stop_completion;
0050 };
0051
0052 enum {
0053     aoa_resource_i2smmio = 0,
0054     aoa_resource_txdbdma,
0055     aoa_resource_rxdbdma,
0056 };
0057
0058 struct i2sbus_dev {
0059     struct soundbus_dev sound;
0060     struct macio_dev *macio;
0061     struct i2sbus_control *control;
0062     volatile struct i2s_interface_regs __iomem *intfregs;
0063
0064     struct resource resources[3];
0065     struct resource *allocated_resource[3];
0066     int interrupts[3];
0067     char rnames[3][32];
0068
0069     /* info about currently active substreams */
0070     struct pcm_info out, in;
0071     snd_pcm_format_t format;
0072     unsigned int rate;
0073
0074     /* list for a single controller */
0075     struct list_head item;
0076     /* number of bus on controller */
0077     int bus_number;
0078     /* for use by control layer */
0079     struct pmf_function *enable,
0080                 *cell_enable,
0081                 *cell_disable,
0082                 *clock_enable,
0083                 *clock_disable;
0084
0085     /* locks */
0086     /* spinlock for low-level interrupt locking */
0087     spinlock_t low_lock;
0088     /* mutex for high-level consistency */
0089     struct mutex lock;
0090 };
0091
0092 #define soundbus_dev_to_i2sbus_dev(sdev) \
0093         container_of(sdev, struct i2sbus_dev, sound)
0094
0095 /* pcm specific functions */
0096 extern int
0097 i2sbus_attach_codec(struct soundbus_dev *dev, struct snd_card *card,
0098             struct codec_info *ci, void *data);
0099 extern void
0100 i2sbus_detach_codec(struct soundbus_dev *dev, void *data);
0101 extern irqreturn_t
0102 i2sbus_tx_intr(int irq, void *devid);
0103 extern irqreturn_t
0104 i2sbus_rx_intr(int irq, void *devid);
0105
0106 extern void i2sbus_wait_for_stop_both(struct i2sbus_dev *i2sdev);
0107 extern void i2sbus_pcm_prepare_both(struct i2sbus_dev *i2sdev);
0108
0109 /* control specific functions */
0110 extern int i2sbus_control_init(struct macio_dev* dev,
0111                    struct i2sbus_control **c);
0112 extern void i2sbus_control_destroy(struct i2sbus_control *c);
0113 extern int i2sbus_control_add_dev(struct i2sbus_control *c,
0114                   struct i2sbus_dev *i2sdev);
0115 extern void i2sbus_control_remove_dev(struct i2sbus_control *c,
0116                       struct i2sbus_dev *i2sdev);
0117 extern int i2sbus_control_enable(struct i2sbus_control *c,
0118                  struct i2sbus_dev *i2sdev);
0119 extern int i2sbus_control_cell(struct i2sbus_control *c,
0120                    struct i2sbus_dev *i2sdev,
0121                    int enable);
0122 extern int i2sbus_control_clock(struct i2sbus_control *c,
0123                 struct i2sbus_dev *i2sdev,
0124                 int enable);
0125 #endif /* __I2SBUS_H */