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i2sbus.h

/*
 * i2sbus driver -- private definitions
 *
 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
 *
 * GPL v2, can be found in COPYING.
 */
#ifndef __I2SBUS_H
#define __I2SBUS_H
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/completion.h>

#include <sound/pcm.h>

#include <asm/prom.h>
#include <asm/pmac_feature.h>
#include <asm/dbdma.h>

#include "i2sbus-interface.h"
#include "../soundbus.h"

struct i2sbus_control {
      struct list_head list;
      struct macio_chip *macio;
};

#define MAX_DBDMA_COMMANDS    32

struct dbdma_command_mem {
      dma_addr_t bus_addr;
      dma_addr_t bus_cmd_start;
      struct dbdma_cmd *cmds;
      void *space;
      int size;
      u32 running:1;
      u32 stopping:1;
};

struct pcm_info {
      u32 created:1, /* has this direction been created with alsa? */
          active:1;  /* is this stream active? */
      /* runtime information */
      struct snd_pcm_substream *substream;
      int current_period;
      u32 frame_count;
      struct dbdma_command_mem dbdma_ring;
      volatile struct dbdma_regs __iomem *dbdma;
      struct completion *stop_completion;
};

enum {
      aoa_resource_i2smmio = 0,
      aoa_resource_txdbdma,
      aoa_resource_rxdbdma,
};

struct i2sbus_dev {
      struct soundbus_dev sound;
      struct macio_dev *macio;
      struct i2sbus_control *control;
      volatile struct i2s_interface_regs __iomem *intfregs;

      struct resource resources[3];
      struct resource *allocated_resource[3];
      int interrupts[3];
      char rnames[3][32];

      /* info about currently active substreams */
      struct pcm_info out, in;
      snd_pcm_format_t format;
      unsigned int rate;

      /* list for a single controller */
      struct list_head item;
      /* number of bus on controller */
      int bus_number;
      /* for use by control layer */
      struct pmf_function *enable,
                      *cell_enable,
                      *cell_disable,
                      *clock_enable,
                      *clock_disable;

      /* locks */
      /* spinlock for low-level interrupt locking */
      spinlock_t low_lock;
      /* mutex for high-level consistency */
      struct mutex lock;
};

#define soundbus_dev_to_i2sbus_dev(sdev) \
            container_of(sdev, struct i2sbus_dev, sound)

/* pcm specific functions */
extern int
i2sbus_attach_codec(struct soundbus_dev *dev, struct snd_card *card,
                struct codec_info *ci, void *data);
extern void
i2sbus_detach_codec(struct soundbus_dev *dev, void *data);
extern irqreturn_t
i2sbus_tx_intr(int irq, void *devid);
extern irqreturn_t
i2sbus_rx_intr(int irq, void *devid);

extern void i2sbus_wait_for_stop_both(struct i2sbus_dev *i2sdev);
extern void i2sbus_pcm_prepare_both(struct i2sbus_dev *i2sdev);

/* control specific functions */
extern int i2sbus_control_init(struct macio_dev* dev,
                         struct i2sbus_control **c);
extern void i2sbus_control_destroy(struct i2sbus_control *c);
extern int i2sbus_control_add_dev(struct i2sbus_control *c,
                          struct i2sbus_dev *i2sdev);
extern void i2sbus_control_remove_dev(struct i2sbus_control *c,
                              struct i2sbus_dev *i2sdev);
extern int i2sbus_control_enable(struct i2sbus_control *c,
                         struct i2sbus_dev *i2sdev);
extern int i2sbus_control_cell(struct i2sbus_control *c,
                         struct i2sbus_dev *i2sdev,
                         int enable);
extern int i2sbus_control_clock(struct i2sbus_control *c,
                        struct i2sbus_dev *i2sdev,
                        int enable);
#endif /* __I2SBUS_H */

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