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root/sound/ppc/snd_ps3.c

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DEFINITIONS

This source file includes following definitions.
  1. read_reg
  2. write_reg
  3. update_reg
  4. update_mask_reg
  5. snd_ps3_verify_dma_stop
  6. snd_ps3_wait_for_dma_stop
  7. snd_ps3_kick_dma
  8. v_to_bus
  9. snd_ps3_bump_buffer
  10. snd_ps3_program_dma
  11. snd_ps3_mute
  12. snd_ps3_pcm_open
  13. snd_ps3_pcm_hw_params
  14. snd_ps3_delay_to_bytes
  15. snd_ps3_pcm_prepare
  16. snd_ps3_pcm_trigger
  17. snd_ps3_pcm_pointer
  18. snd_ps3_pcm_hw_free
  19. snd_ps3_pcm_close
  20. snd_ps3_audio_fixup
  21. snd_ps3_change_avsetting
  22. snd_ps3_init_avsetting
  23. snd_ps3_set_avsetting
  24. snd_ps3_map_mmio
  25. snd_ps3_unmap_mmio
  26. snd_ps3_allocate_irq
  27. snd_ps3_free_irq
  28. snd_ps3_audio_set_base_addr
  29. snd_ps3_driver_probe
  30. snd_ps3_driver_remove
  31. snd_ps3_interrupt
  32. snd_ps3_init
  33. snd_ps3_exit

/*
 * Audio support for PS3
 * Copyright (C) 2007 Sony Computer Entertainment Inc.
 * All rights reserved.
 * Copyright 2006, 2007 Sony Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; version 2 of the Licence.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include <linux/init.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/pcm.h>
#include <sound/asound.h>
#include <sound/memalloc.h>
#include <sound/pcm_params.h>
#include <sound/control.h>
#include <linux/dmapool.h>
#include <linux/dma-mapping.h>
#include <asm/firmware.h>
#include <asm/dma.h>
#include <asm/lv1call.h>
#include <asm/ps3.h>
#include <asm/ps3av.h>

#include "snd_ps3_reg.h"
#include "snd_ps3.h"

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("PS3 sound driver");
MODULE_AUTHOR("Sony Computer Entertainment Inc.");

/* module  entries */
static int __init snd_ps3_init(void);
static void __exit snd_ps3_exit(void);

/* ALSA snd driver ops */
static int snd_ps3_pcm_open(struct snd_pcm_substream *substream);
static int snd_ps3_pcm_close(struct snd_pcm_substream *substream);
static int snd_ps3_pcm_prepare(struct snd_pcm_substream *substream);
static int snd_ps3_pcm_trigger(struct snd_pcm_substream *substream,
                                 int cmd);
static snd_pcm_uframes_t snd_ps3_pcm_pointer(struct snd_pcm_substream
                                             *substream);
static int snd_ps3_pcm_hw_params(struct snd_pcm_substream *substream,
                                 struct snd_pcm_hw_params *hw_params);
static int snd_ps3_pcm_hw_free(struct snd_pcm_substream *substream);


/* ps3_system_bus_driver entries */
static int __init snd_ps3_driver_probe(struct ps3_system_bus_device *dev);
static int snd_ps3_driver_remove(struct ps3_system_bus_device *dev);

/* address setup */
static int snd_ps3_map_mmio(void);
static void snd_ps3_unmap_mmio(void);
static int snd_ps3_allocate_irq(void);
static void snd_ps3_free_irq(void);
static void snd_ps3_audio_set_base_addr(uint64_t ioaddr_start);

/* interrupt handler */
static irqreturn_t snd_ps3_interrupt(int irq, void *dev_id);


/* set sampling rate/format */
static int snd_ps3_set_avsetting(struct snd_pcm_substream *substream);
/* take effect parameter change */
static int snd_ps3_change_avsetting(struct snd_ps3_card_info *card);
/* initialize avsetting and take it effect */
static int snd_ps3_init_avsetting(struct snd_ps3_card_info *card);
/* setup dma */
static int snd_ps3_program_dma(struct snd_ps3_card_info *card,
                               enum snd_ps3_dma_filltype filltype);
static void snd_ps3_wait_for_dma_stop(struct snd_ps3_card_info *card);

static dma_addr_t v_to_bus(struct snd_ps3_card_info *, void  *vaddr, int ch);


module_init(snd_ps3_init);
module_exit(snd_ps3_exit);

/*
 * global
 */
static struct snd_ps3_card_info the_card;

static int snd_ps3_start_delay = CONFIG_SND_PS3_DEFAULT_START_DELAY;

module_param_named(start_delay, snd_ps3_start_delay, uint, 0644);
MODULE_PARM_DESC(start_delay, "time to insert silent data in milisec");

static int index = SNDRV_DEFAULT_IDX1;
static char *id = SNDRV_DEFAULT_STR1;

module_param(index, int, 0444);
MODULE_PARM_DESC(index, "Index value for PS3 soundchip.");
module_param(id, charp, 0444);
MODULE_PARM_DESC(id, "ID string for PS3 soundchip.");


/*
 * PS3 audio register access
 */
static inline u32 read_reg(unsigned int reg)
{
        return in_be32(the_card.mapped_mmio_vaddr + reg);
}
static inline void write_reg(unsigned int reg, u32 val)
{
        out_be32(the_card.mapped_mmio_vaddr + reg, val);
}
static inline void update_reg(unsigned int reg, u32 or_val)
{
        u32 newval = read_reg(reg) | or_val;
        write_reg(reg, newval);
}
static inline void update_mask_reg(unsigned int reg, u32 mask, u32 or_val)
{
        u32 newval = (read_reg(reg) & mask) | or_val;
        write_reg(reg, newval);
}

/*
 * ALSA defs
 */
static const struct snd_pcm_hardware snd_ps3_pcm_hw = {
        .info = (SNDRV_PCM_INFO_MMAP |
                 SNDRV_PCM_INFO_NONINTERLEAVED |
                 SNDRV_PCM_INFO_MMAP_VALID),
        .formats = (SNDRV_PCM_FMTBIT_S16_BE |
                    SNDRV_PCM_FMTBIT_S24_BE),
        .rates = (SNDRV_PCM_RATE_44100 |
                  SNDRV_PCM_RATE_48000 |
                  SNDRV_PCM_RATE_88200 |
                  SNDRV_PCM_RATE_96000),
        .rate_min = 44100,
        .rate_max = 96000,

        .channels_min = 2, /* stereo only */
        .channels_max = 2,

        .buffer_bytes_max = PS3_AUDIO_FIFO_SIZE * 64,

        /* interrupt by four stages */
        .period_bytes_min = PS3_AUDIO_FIFO_STAGE_SIZE * 4,
        .period_bytes_max = PS3_AUDIO_FIFO_STAGE_SIZE * 4,

        .periods_min = 16,
        .periods_max = 32, /* buffer_size_max/ period_bytes_max */

        .fifo_size = PS3_AUDIO_FIFO_SIZE
};

static struct snd_pcm_ops snd_ps3_pcm_spdif_ops =
{
        .open = snd_ps3_pcm_open,
        .close = snd_ps3_pcm_close,
        .prepare = snd_ps3_pcm_prepare,
        .ioctl = snd_pcm_lib_ioctl,
        .trigger = snd_ps3_pcm_trigger,
        .pointer = snd_ps3_pcm_pointer,
        .hw_params = snd_ps3_pcm_hw_params,
        .hw_free = snd_ps3_pcm_hw_free
};

static int snd_ps3_verify_dma_stop(struct snd_ps3_card_info *card,
                                   int count, int force_stop)
{
        int dma_ch, done, retries, stop_forced = 0;
        uint32_t status;

        for (dma_ch = 0; dma_ch < 8; dma_ch ++) {
                retries = count;
                do {
                        status = read_reg(PS3_AUDIO_KICK(dma_ch)) &
                                PS3_AUDIO_KICK_STATUS_MASK;
                        switch (status) {
                        case PS3_AUDIO_KICK_STATUS_DONE:
                        case PS3_AUDIO_KICK_STATUS_NOTIFY:
                        case PS3_AUDIO_KICK_STATUS_CLEAR:
                        case PS3_AUDIO_KICK_STATUS_ERROR:
                                done = 1;
                                break;
                        default:
                                done = 0;
                                udelay(10);
                        }
                } while (!done && --retries);
                if (!retries && force_stop) {
                        pr_info("%s: DMA ch %d is not stopped.",
                                __func__, dma_ch);
                        /* last resort. force to stop dma.
                         *  NOTE: this cause DMA done interrupts
                         */
                        update_reg(PS3_AUDIO_CONFIG, PS3_AUDIO_CONFIG_CLEAR);
                        stop_forced = 1;
                }
        }
        return stop_forced;
}

/*
 * wait for all dma is done.
 * NOTE: caller should reset card->running before call.
 *       If not, the interrupt handler will re-start DMA,
 *       then DMA is never stopped.
 */
static void snd_ps3_wait_for_dma_stop(struct snd_ps3_card_info *card)
{
        int stop_forced;
        /*
         * wait for the last dma is done
         */

        /*
         * expected maximum DMA done time is 5.7ms + something (DMA itself).
         * 5.7ms is from 16bit/sample 2ch 44.1Khz; the time next
         * DMA kick event would occur.
         */
        stop_forced = snd_ps3_verify_dma_stop(card, 700, 1);

        /*
         * clear outstanding interrupts.
         */
        update_reg(PS3_AUDIO_INTR_0, 0);
        update_reg(PS3_AUDIO_AX_IS, 0);

        /*
         *revert CLEAR bit since it will not reset automatically after DMA stop
         */
        if (stop_forced)
                update_mask_reg(PS3_AUDIO_CONFIG, ~PS3_AUDIO_CONFIG_CLEAR, 0);
        /* ensure the hardware sees changes */
        wmb();
}

static void snd_ps3_kick_dma(struct snd_ps3_card_info *card)
{

        update_reg(PS3_AUDIO_KICK(0), PS3_AUDIO_KICK_REQUEST);
        /* ensure the hardware sees the change */
        wmb();
}

/*
 * convert virtual addr to ioif bus addr.
 */
static dma_addr_t v_to_bus(struct snd_ps3_card_info *card,
                           void * paddr,
                           int ch)
{
        return card->dma_start_bus_addr[ch] +
                (paddr - card->dma_start_vaddr[ch]);
};


/*
 * increment ring buffer pointer.
 * NOTE: caller must hold write spinlock
 */
static void snd_ps3_bump_buffer(struct snd_ps3_card_info *card,
                                enum snd_ps3_ch ch, size_t byte_count,
                                int stage)
{
        if (!stage)
                card->dma_last_transfer_vaddr[ch] =
                        card->dma_next_transfer_vaddr[ch];
        card->dma_next_transfer_vaddr[ch] += byte_count;
        if ((card->dma_start_vaddr[ch] + (card->dma_buffer_size / 2)) <=
            card->dma_next_transfer_vaddr[ch]) {
                card->dma_next_transfer_vaddr[ch] = card->dma_start_vaddr[ch];
        }
}
/*
 * setup dmac to send data to audio and attenuate samples on the ring buffer
 */
static int snd_ps3_program_dma(struct snd_ps3_card_info *card,
                               enum snd_ps3_dma_filltype filltype)
{
        /* this dmac does not support over 4G */
        uint32_t dma_addr;
        int fill_stages, dma_ch, stage;
        enum snd_ps3_ch ch;
        uint32_t ch0_kick_event = 0; /* initialize to mute gcc */
        void *start_vaddr;
        unsigned long irqsave;
        int silent = 0;

        switch (filltype) {
        case SND_PS3_DMA_FILLTYPE_SILENT_FIRSTFILL:
                silent = 1;
                /* intentionally fall thru */
        case SND_PS3_DMA_FILLTYPE_FIRSTFILL:
                ch0_kick_event = PS3_AUDIO_KICK_EVENT_ALWAYS;
                break;

        case SND_PS3_DMA_FILLTYPE_SILENT_RUNNING:
                silent = 1;
                /* intentionally fall thru */
        case SND_PS3_DMA_FILLTYPE_RUNNING:
                ch0_kick_event = PS3_AUDIO_KICK_EVENT_SERIALOUT0_EMPTY;
                break;
        }

        snd_ps3_verify_dma_stop(card, 700, 0);
        fill_stages = 4;
        spin_lock_irqsave(&card->dma_lock, irqsave);
        for (ch = 0; ch < 2; ch++) {
                start_vaddr = card->dma_next_transfer_vaddr[0];
                for (stage = 0; stage < fill_stages; stage ++) {
                        dma_ch = stage * 2 + ch;
                        if (silent)
                                dma_addr = card->null_buffer_start_dma_addr;
                        else
                                dma_addr =
                                v_to_bus(card,
                                         card->dma_next_transfer_vaddr[ch],
                                         ch);

                        write_reg(PS3_AUDIO_SOURCE(dma_ch),
                                  (PS3_AUDIO_SOURCE_TARGET_SYSTEM_MEMORY |
                                   dma_addr));

                        /* dst: fixed to 3wire#0 */
                        if (ch == 0)
                                write_reg(PS3_AUDIO_DEST(dma_ch),
                                          (PS3_AUDIO_DEST_TARGET_AUDIOFIFO |
                                           PS3_AUDIO_AO_3W_LDATA(0)));
                        else
                                write_reg(PS3_AUDIO_DEST(dma_ch),
                                          (PS3_AUDIO_DEST_TARGET_AUDIOFIFO |
                                           PS3_AUDIO_AO_3W_RDATA(0)));

                        /* count always 1 DMA block (1/2 stage = 128 bytes) */
                        write_reg(PS3_AUDIO_DMASIZE(dma_ch), 0);
                        /* bump pointer if needed */
                        if (!silent)
                                snd_ps3_bump_buffer(card, ch,
                                                    PS3_AUDIO_DMAC_BLOCK_SIZE,
                                                    stage);

                        /* kick event  */
                        if (dma_ch == 0)
                                write_reg(PS3_AUDIO_KICK(dma_ch),
                                          ch0_kick_event);
                        else
                                write_reg(PS3_AUDIO_KICK(dma_ch),
                                          PS3_AUDIO_KICK_EVENT_AUDIO_DMA(dma_ch
                                                                         - 1) |
                                          PS3_AUDIO_KICK_REQUEST);
                }
        }
        /* ensure the hardware sees the change */
        wmb();
        spin_unlock_irqrestore(&card->dma_lock, irqsave);

        return 0;
}

/*
 * audio mute on/off
 * mute_on : 0 output enabled
 *           1 mute
 */
static int snd_ps3_mute(int mute_on)
{
        return ps3av_audio_mute(mute_on);
}

/*
 * PCM operators
 */
static int snd_ps3_pcm_open(struct snd_pcm_substream *substream)
{
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct snd_ps3_card_info *card = snd_pcm_substream_chip(substream);
        int pcm_index;

        pcm_index = substream->pcm->device;
        /* to retrieve substream/runtime in interrupt handler */
        card->substream = substream;

        runtime->hw = snd_ps3_pcm_hw;

        card->start_delay = snd_ps3_start_delay;

        /* mute off */
        snd_ps3_mute(0); /* this function sleep */

        snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
                                   PS3_AUDIO_FIFO_STAGE_SIZE * 4 * 2);
        return 0;
};

static int snd_ps3_pcm_hw_params(struct snd_pcm_substream *substream,
                                 struct snd_pcm_hw_params *hw_params)
{
        size_t size;

        /* alloc transport buffer */
        size = params_buffer_bytes(hw_params);
        snd_pcm_lib_malloc_pages(substream, size);
        return 0;
};

static int snd_ps3_delay_to_bytes(struct snd_pcm_substream *substream,
                                  unsigned int delay_ms)
{
        int ret;
        int rate ;

        rate = substream->runtime->rate;
        ret = snd_pcm_format_size(substream->runtime->format,
                                  rate * delay_ms / 1000)
                * substream->runtime->channels;

        pr_debug(KERN_ERR "%s: time=%d rate=%d bytes=%ld, frames=%d, ret=%d\n",
                 __func__,
                 delay_ms,
                 rate,
                 snd_pcm_format_size(substream->runtime->format, rate),
                 rate * delay_ms / 1000,
                 ret);

        return ret;
};

static int snd_ps3_pcm_prepare(struct snd_pcm_substream *substream)
{
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct snd_ps3_card_info *card = snd_pcm_substream_chip(substream);
        unsigned long irqsave;

        if (!snd_ps3_set_avsetting(substream)) {
                /* some parameter changed */
                write_reg(PS3_AUDIO_AX_IE,
                          PS3_AUDIO_AX_IE_ASOBEIE(0) |
                          PS3_AUDIO_AX_IE_ASOBUIE(0));
                /*
                 * let SPDIF device re-lock with SPDIF signal,
                 * start with some silence
                 */
                card->silent = snd_ps3_delay_to_bytes(substream,
                                                      card->start_delay) /
                        (PS3_AUDIO_FIFO_STAGE_SIZE * 4); /* every 4 times */
        }

        /* restart ring buffer pointer */
        spin_lock_irqsave(&card->dma_lock, irqsave);
        {
                card->dma_buffer_size = runtime->dma_bytes;

                card->dma_last_transfer_vaddr[SND_PS3_CH_L] =
                        card->dma_next_transfer_vaddr[SND_PS3_CH_L] =
                        card->dma_start_vaddr[SND_PS3_CH_L] =
                        runtime->dma_area;
                card->dma_start_bus_addr[SND_PS3_CH_L] = runtime->dma_addr;

                card->dma_last_transfer_vaddr[SND_PS3_CH_R] =
                        card->dma_next_transfer_vaddr[SND_PS3_CH_R] =
                        card->dma_start_vaddr[SND_PS3_CH_R] =
                        runtime->dma_area + (runtime->dma_bytes / 2);
                card->dma_start_bus_addr[SND_PS3_CH_R] =
                        runtime->dma_addr + (runtime->dma_bytes / 2);

                pr_debug("%s: vaddr=%p bus=%#lx\n", __func__,
                         card->dma_start_vaddr[SND_PS3_CH_L],
                         card->dma_start_bus_addr[SND_PS3_CH_L]);

        }
        spin_unlock_irqrestore(&card->dma_lock, irqsave);

        /* ensure the hardware sees the change */
        mb();

        return 0;
};

static int snd_ps3_pcm_trigger(struct snd_pcm_substream *substream,
                               int cmd)
{
        struct snd_ps3_card_info *card = snd_pcm_substream_chip(substream);
        int ret = 0;

        switch (cmd) {
        case SNDRV_PCM_TRIGGER_START:
                /* clear outstanding interrupts  */
                update_reg(PS3_AUDIO_AX_IS, 0);

                spin_lock(&card->dma_lock);
                {
                        card->running = 1;
                }
                spin_unlock(&card->dma_lock);

                snd_ps3_program_dma(card,
                                    SND_PS3_DMA_FILLTYPE_SILENT_FIRSTFILL);
                snd_ps3_kick_dma(card);
                while (read_reg(PS3_AUDIO_KICK(7)) &
                       PS3_AUDIO_KICK_STATUS_MASK) {
                        udelay(1);
                }
                snd_ps3_program_dma(card, SND_PS3_DMA_FILLTYPE_SILENT_RUNNING);
                snd_ps3_kick_dma(card);
                break;

        case SNDRV_PCM_TRIGGER_STOP:
                spin_lock(&card->dma_lock);
                {
                        card->running = 0;
                }
                spin_unlock(&card->dma_lock);
                snd_ps3_wait_for_dma_stop(card);
                break;
        default:
                break;

        }

        return ret;
};

/*
 * report current pointer
 */
static snd_pcm_uframes_t snd_ps3_pcm_pointer(
        struct snd_pcm_substream *substream)
{
        struct snd_ps3_card_info *card = snd_pcm_substream_chip(substream);
        size_t bytes;
        snd_pcm_uframes_t ret;

        spin_lock(&card->dma_lock);
        {
                bytes = (size_t)(card->dma_last_transfer_vaddr[SND_PS3_CH_L] -
                                 card->dma_start_vaddr[SND_PS3_CH_L]);
        }
        spin_unlock(&card->dma_lock);

        ret = bytes_to_frames(substream->runtime, bytes * 2);

        return ret;
};

static int snd_ps3_pcm_hw_free(struct snd_pcm_substream *substream)
{
        int ret;
        ret = snd_pcm_lib_free_pages(substream);
        return ret;
};

static int snd_ps3_pcm_close(struct snd_pcm_substream *substream)
{
        /* mute on */
        snd_ps3_mute(1);
        return 0;
};

static void snd_ps3_audio_fixup(struct snd_ps3_card_info *card)
{
        /*
         * avsetting driver seems to never change the followings
         * so, init them here once
         */

        /* no dma interrupt needed */
        write_reg(PS3_AUDIO_INTR_EN_0, 0);

        /* use every 4 buffer empty interrupt */
        update_mask_reg(PS3_AUDIO_AX_IC,
                        PS3_AUDIO_AX_IC_AASOIMD_MASK,
                        PS3_AUDIO_AX_IC_AASOIMD_EVERY4);

        /* enable 3wire clocks */
        update_mask_reg(PS3_AUDIO_AO_3WMCTRL,
                        ~(PS3_AUDIO_AO_3WMCTRL_ASOBCLKD_DISABLED |
                          PS3_AUDIO_AO_3WMCTRL_ASOLRCKD_DISABLED),
                        0);
        update_reg(PS3_AUDIO_AO_3WMCTRL,
                   PS3_AUDIO_AO_3WMCTRL_ASOPLRCK_DEFAULT);
}

/*
 * av setting
 * NOTE: calling this function may generate audio interrupt.
 */
static int snd_ps3_change_avsetting(struct snd_ps3_card_info *card)
{
        int ret, retries, i;
        pr_debug("%s: start\n", __func__);

        ret = ps3av_set_audio_mode(card->avs.avs_audio_ch,
                                  card->avs.avs_audio_rate,
                                  card->avs.avs_audio_width,
                                  card->avs.avs_audio_format,
                                  card->avs.avs_audio_source);
        /*
         * Reset the following unwanted settings:
         */

        /* disable all 3wire buffers */
        update_mask_reg(PS3_AUDIO_AO_3WMCTRL,
                        ~(PS3_AUDIO_AO_3WMCTRL_ASOEN(0) |
                          PS3_AUDIO_AO_3WMCTRL_ASOEN(1) |
                          PS3_AUDIO_AO_3WMCTRL_ASOEN(2) |
                          PS3_AUDIO_AO_3WMCTRL_ASOEN(3)),
                        0);
        wmb();  /* ensure the hardware sees the change */
        /* wait for actually stopped */
        retries = 1000;
        while ((read_reg(PS3_AUDIO_AO_3WMCTRL) &
                (PS3_AUDIO_AO_3WMCTRL_ASORUN(0) |
                 PS3_AUDIO_AO_3WMCTRL_ASORUN(1) |
                 PS3_AUDIO_AO_3WMCTRL_ASORUN(2) |
                 PS3_AUDIO_AO_3WMCTRL_ASORUN(3))) &&
               --retries) {
                udelay(1);
        }

        /* reset buffer pointer */
        for (i = 0; i < 4; i++) {
                update_reg(PS3_AUDIO_AO_3WCTRL(i),
                           PS3_AUDIO_AO_3WCTRL_ASOBRST_RESET);
                udelay(10);
        }
        wmb(); /* ensure the hardware actually start resetting */

        /* enable 3wire#0 buffer */
        update_reg(PS3_AUDIO_AO_3WMCTRL, PS3_AUDIO_AO_3WMCTRL_ASOEN(0));


        /* In 24bit mode,ALSA inserts a zero byte at first byte of per sample */
        update_mask_reg(PS3_AUDIO_AO_3WCTRL(0),
                        ~PS3_AUDIO_AO_3WCTRL_ASODF,
                        PS3_AUDIO_AO_3WCTRL_ASODF_LSB);
        update_mask_reg(PS3_AUDIO_AO_SPDCTRL(0),
                        ~PS3_AUDIO_AO_SPDCTRL_SPODF,
                        PS3_AUDIO_AO_SPDCTRL_SPODF_LSB);
        /* ensure all the setting above is written back to register */
        wmb();
        /* avsetting driver altered AX_IE, caller must reset it if you want */
        pr_debug("%s: end\n", __func__);
        return ret;
}

static int snd_ps3_init_avsetting(struct snd_ps3_card_info *card)
{
        int ret;
        pr_debug("%s: start\n", __func__);
        card->avs.avs_audio_ch = PS3AV_CMD_AUDIO_NUM_OF_CH_2;
        card->avs.avs_audio_rate = PS3AV_CMD_AUDIO_FS_48K;
        card->avs.avs_audio_width = PS3AV_CMD_AUDIO_WORD_BITS_16;
        card->avs.avs_audio_format = PS3AV_CMD_AUDIO_FORMAT_PCM;
        card->avs.avs_audio_source = PS3AV_CMD_AUDIO_SOURCE_SERIAL;

        ret = snd_ps3_change_avsetting(card);

        snd_ps3_audio_fixup(card);

        /* to start to generate SPDIF signal, fill data */
        snd_ps3_program_dma(card, SND_PS3_DMA_FILLTYPE_SILENT_FIRSTFILL);
        snd_ps3_kick_dma(card);
        pr_debug("%s: end\n", __func__);
        return ret;
}

/*
 *  set sampling rate according to the substream
 */
static int snd_ps3_set_avsetting(struct snd_pcm_substream *substream)
{
        struct snd_ps3_card_info *card = snd_pcm_substream_chip(substream);
        struct snd_ps3_avsetting_info avs;

        avs = card->avs;

        pr_debug("%s: called freq=%d width=%d\n", __func__,
                 substream->runtime->rate,
                 snd_pcm_format_width(substream->runtime->format));

        pr_debug("%s: before freq=%d width=%d\n", __func__,
                 card->avs.avs_audio_rate, card->avs.avs_audio_width);

        /* sample rate */
        switch (substream->runtime->rate) {
        case 44100:
                avs.avs_audio_rate = PS3AV_CMD_AUDIO_FS_44K;
                break;
        case 48000:
                avs.avs_audio_rate = PS3AV_CMD_AUDIO_FS_48K;
                break;
        case 88200:
                avs.avs_audio_rate = PS3AV_CMD_AUDIO_FS_88K;
                break;
        case 96000:
                avs.avs_audio_rate = PS3AV_CMD_AUDIO_FS_96K;
                break;
        default:
                pr_info("%s: invalid rate %d\n", __func__,
                        substream->runtime->rate);
                return 1;
        }

        /* width */
        switch (snd_pcm_format_width(substream->runtime->format)) {
        case 16:
                avs.avs_audio_width = PS3AV_CMD_AUDIO_WORD_BITS_16;
                break;
        case 24:
                avs.avs_audio_width = PS3AV_CMD_AUDIO_WORD_BITS_24;
                break;
        default:
                pr_info("%s: invalid width %d\n", __func__,
                        snd_pcm_format_width(substream->runtime->format));
                return 1;
        }

        if ((card->avs.avs_audio_width != avs.avs_audio_width) ||
            (card->avs.avs_audio_rate != avs.avs_audio_rate)) {
                card->avs = avs;
                snd_ps3_change_avsetting(card);

                pr_debug("%s: after freq=%d width=%d\n", __func__,
                         card->avs.avs_audio_rate, card->avs.avs_audio_width);

                return 0;
        } else
                return 1;
}



static int snd_ps3_map_mmio(void)
{
        the_card.mapped_mmio_vaddr =
                ioremap(the_card.ps3_dev->m_region->bus_addr,
                        the_card.ps3_dev->m_region->len);

        if (!the_card.mapped_mmio_vaddr) {
                pr_info("%s: ioremap 0 failed p=%#lx l=%#lx \n",
                       __func__, the_card.ps3_dev->m_region->lpar_addr,
                       the_card.ps3_dev->m_region->len);
                return -ENXIO;
        }

        return 0;
};

static void snd_ps3_unmap_mmio(void)
{
        iounmap(the_card.mapped_mmio_vaddr);
        the_card.mapped_mmio_vaddr = NULL;
}

static int snd_ps3_allocate_irq(void)
{
        int ret;
        u64 lpar_addr, lpar_size;
        u64 __iomem *mapped;

        /* FIXME: move this to device_init (H/W probe) */

        /* get irq outlet */
        ret = lv1_gpu_device_map(1, &lpar_addr, &lpar_size);
        if (ret) {
                pr_info("%s: device map 1 failed %d\n", __func__,
                        ret);
                return -ENXIO;
        }

        mapped = ioremap(lpar_addr, lpar_size);
        if (!mapped) {
                pr_info("%s: ioremap 1 failed \n", __func__);
                return -ENXIO;
        }

        the_card.audio_irq_outlet = in_be64(mapped);

        iounmap(mapped);
        ret = lv1_gpu_device_unmap(1);
        if (ret)
                pr_info("%s: unmap 1 failed\n", __func__);

        /* irq */
        ret = ps3_irq_plug_setup(PS3_BINDING_CPU_ANY,
                                 the_card.audio_irq_outlet,
                                 &the_card.irq_no);
        if (ret) {
                pr_info("%s:ps3_alloc_irq failed (%d)\n", __func__, ret);
                return ret;
        }

        ret = request_irq(the_card.irq_no, snd_ps3_interrupt, IRQF_DISABLED,
                          SND_PS3_DRIVER_NAME, &the_card);
        if (ret) {
                pr_info("%s: request_irq failed (%d)\n", __func__, ret);
                goto cleanup_irq;
        }

        return 0;

 cleanup_irq:
        ps3_irq_plug_destroy(the_card.irq_no);
        return ret;
};

static void snd_ps3_free_irq(void)
{
        free_irq(the_card.irq_no, &the_card);
        ps3_irq_plug_destroy(the_card.irq_no);
}

static void snd_ps3_audio_set_base_addr(uint64_t ioaddr_start)
{
        uint64_t val;
        int ret;

        val = (ioaddr_start & (0x0fUL << 32)) >> (32 - 20) |
                (0x03UL << 24) |
                (0x0fUL << 12) |
                (PS3_AUDIO_IOID);

        ret = lv1_gpu_attribute(0x100, 0x007, val, 0, 0);
        if (ret)
                pr_info("%s: gpu_attribute failed %d\n", __func__,
                        ret);
}

static int __init snd_ps3_driver_probe(struct ps3_system_bus_device *dev)
{
        int ret;
        u64 lpar_addr, lpar_size;

        BUG_ON(!firmware_has_feature(FW_FEATURE_PS3_LV1));
        BUG_ON(dev->match_id != PS3_MATCH_ID_SOUND);

        the_card.ps3_dev = dev;

        ret = ps3_open_hv_device(dev);

        if (ret)
                return -ENXIO;

        /* setup MMIO */
        ret = lv1_gpu_device_map(2, &lpar_addr, &lpar_size);
        if (ret) {
                pr_info("%s: device map 2 failed %d\n", __func__, ret);
                goto clean_open;
        }
        ps3_mmio_region_init(dev, dev->m_region, lpar_addr, lpar_size,
                PAGE_SHIFT);

        ret = snd_ps3_map_mmio();
        if (ret)
                goto clean_dev_map;

        /* setup DMA area */
        ps3_dma_region_init(dev, dev->d_region,
                            PAGE_SHIFT, /* use system page size */
                            0, /* dma type; not used */
                            NULL,
                            _ALIGN_UP(SND_PS3_DMA_REGION_SIZE, PAGE_SIZE));
        dev->d_region->ioid = PS3_AUDIO_IOID;

        ret = ps3_dma_region_create(dev->d_region);
        if (ret) {
                pr_info("%s: region_create\n", __func__);
                goto clean_mmio;
        }

        snd_ps3_audio_set_base_addr(dev->d_region->bus_addr);

        /* CONFIG_SND_PS3_DEFAULT_START_DELAY */
        the_card.start_delay = snd_ps3_start_delay;

        /* irq */
        if (snd_ps3_allocate_irq()) {
                ret = -ENXIO;
                goto clean_dma_region;
        }

        /* create card instance */
        the_card.card = snd_card_new(index, id, THIS_MODULE, 0);
        if (!the_card.card) {
                ret = -ENXIO;
                goto clean_irq;
        }

        strcpy(the_card.card->driver, "PS3");
        strcpy(the_card.card->shortname, "PS3");
        strcpy(the_card.card->longname, "PS3 sound");
        /* create PCM devices instance */
        /* NOTE:this driver works assuming pcm:substream = 1:1 */
        ret = snd_pcm_new(the_card.card,
                          "SPDIF",
                          0, /* instance index, will be stored pcm.device*/
                          1, /* output substream */
                          0, /* input substream */
                          &(the_card.pcm));
        if (ret)
                goto clean_card;

        the_card.pcm->private_data = &the_card;
        strcpy(the_card.pcm->name, "SPDIF");

        /* set pcm ops */
        snd_pcm_set_ops(the_card.pcm, SNDRV_PCM_STREAM_PLAYBACK,
                        &snd_ps3_pcm_spdif_ops);

        the_card.pcm->info_flags = SNDRV_PCM_INFO_NONINTERLEAVED;
        /* pre-alloc PCM DMA buffer*/
        ret = snd_pcm_lib_preallocate_pages_for_all(the_card.pcm,
                                        SNDRV_DMA_TYPE_DEV,
                                        &dev->core,
                                        SND_PS3_PCM_PREALLOC_SIZE,
                                        SND_PS3_PCM_PREALLOC_SIZE);
        if (ret < 0) {
                pr_info("%s: prealloc failed\n", __func__);
                goto clean_card;
        }

        /*
         * allocate null buffer
         * its size should be lager than PS3_AUDIO_FIFO_STAGE_SIZE * 2
         * PAGE_SIZE is enogh
         */
        if (!(the_card.null_buffer_start_vaddr =
              dma_alloc_coherent(&the_card.ps3_dev->core,
                                 PAGE_SIZE,
                                 &the_card.null_buffer_start_dma_addr,
                                 GFP_KERNEL))) {
                pr_info("%s: nullbuffer alloc failed\n", __func__);
                goto clean_preallocate;
        }
        pr_debug("%s: null vaddr=%p dma=%#lx\n", __func__,
                 the_card.null_buffer_start_vaddr,
                 the_card.null_buffer_start_dma_addr);
        /* set default sample rate/word width */
        snd_ps3_init_avsetting(&the_card);

        /* register the card */
        snd_card_set_dev(the_card.card, &dev->core);
        ret = snd_card_register(the_card.card);
        if (ret < 0)
                goto clean_dma_map;

        pr_info("%s started. start_delay=%dms\n",
                the_card.card->longname, the_card.start_delay);
        return 0;

clean_dma_map:
        dma_free_coherent(&the_card.ps3_dev->core,
                          PAGE_SIZE,
                          the_card.null_buffer_start_vaddr,
                          the_card.null_buffer_start_dma_addr);
clean_preallocate:
        snd_pcm_lib_preallocate_free_for_all(the_card.pcm);
clean_card:
        snd_card_free(the_card.card);
clean_irq:
        snd_ps3_free_irq();
clean_dma_region:
        ps3_dma_region_free(dev->d_region);
clean_mmio:
        snd_ps3_unmap_mmio();
clean_dev_map:
        lv1_gpu_device_unmap(2);
clean_open:
        ps3_close_hv_device(dev);
        /*
         * there is no destructor function to pcm.
         * midlayer automatically releases if the card removed
         */
        return ret;
}; /* snd_ps3_probe */

/* called when module removal */
static int snd_ps3_driver_remove(struct ps3_system_bus_device *dev)
{
        int ret;
        pr_info("%s:start id=%d\n", __func__,  dev->match_id);
        if (dev->match_id != PS3_MATCH_ID_SOUND)
                return -ENXIO;

        /*
         * ctl and preallocate buffer will be freed in
         * snd_card_free
         */
        ret = snd_card_free(the_card.card);
        if (ret)
                pr_info("%s: ctl freecard=%d\n", __func__, ret);

        dma_free_coherent(&dev->core,
                          PAGE_SIZE,
                          the_card.null_buffer_start_vaddr,
                          the_card.null_buffer_start_dma_addr);

        ps3_dma_region_free(dev->d_region);

        snd_ps3_free_irq();
        snd_ps3_unmap_mmio();

        lv1_gpu_device_unmap(2);
        ps3_close_hv_device(dev);
        pr_info("%s:end id=%d\n", __func__, dev->match_id);
        return 0;
} /* snd_ps3_remove */

static struct ps3_system_bus_driver snd_ps3_bus_driver_info = {
        .match_id = PS3_MATCH_ID_SOUND,
        .probe = snd_ps3_driver_probe,
        .remove = snd_ps3_driver_remove,
        .shutdown = snd_ps3_driver_remove,
        .core = {
                .name = SND_PS3_DRIVER_NAME,
                .owner = THIS_MODULE,
        },
};


/*
 * Interrupt handler
 */
static irqreturn_t snd_ps3_interrupt(int irq, void *dev_id)
{

        uint32_t port_intr;
        int underflow_occured = 0;
        struct snd_ps3_card_info *card = dev_id;

        if (!card->running) {
                update_reg(PS3_AUDIO_AX_IS, 0);
                update_reg(PS3_AUDIO_INTR_0, 0);
                return IRQ_HANDLED;
        }

        port_intr = read_reg(PS3_AUDIO_AX_IS);
        /*
         *serial buffer empty detected (every 4 times),
         *program next dma and kick it
         */
        if (port_intr & PS3_AUDIO_AX_IE_ASOBEIE(0)) {
                write_reg(PS3_AUDIO_AX_IS, PS3_AUDIO_AX_IE_ASOBEIE(0));
                if (port_intr & PS3_AUDIO_AX_IE_ASOBUIE(0)) {
                        write_reg(PS3_AUDIO_AX_IS, port_intr);
                        underflow_occured = 1;
                }
                if (card->silent) {
                        /* we are still in silent time */
                        snd_ps3_program_dma(card,
                                (underflow_occured) ?
                                SND_PS3_DMA_FILLTYPE_SILENT_FIRSTFILL :
                                SND_PS3_DMA_FILLTYPE_SILENT_RUNNING);
                        snd_ps3_kick_dma(card);
                        card->silent --;
                } else {
                        snd_ps3_program_dma(card,
                                (underflow_occured) ?
                                SND_PS3_DMA_FILLTYPE_FIRSTFILL :
                                SND_PS3_DMA_FILLTYPE_RUNNING);
                        snd_ps3_kick_dma(card);
                        snd_pcm_period_elapsed(card->substream);
                }
        } else if (port_intr & PS3_AUDIO_AX_IE_ASOBUIE(0)) {
                write_reg(PS3_AUDIO_AX_IS, PS3_AUDIO_AX_IE_ASOBUIE(0));
                /*
                 * serial out underflow, but buffer empty not detected.
                 * in this case, fill fifo with 0 to recover.  After
                 * filling dummy data, serial automatically start to
                 * consume them and then will generate normal buffer
                 * empty interrupts.
                 * If both buffer underflow and buffer empty are occured,
                 * it is better to do nomal data transfer than empty one
                 */
                snd_ps3_program_dma(card,
                                    SND_PS3_DMA_FILLTYPE_SILENT_FIRSTFILL);
                snd_ps3_kick_dma(card);
                snd_ps3_program_dma(card,
                                    SND_PS3_DMA_FILLTYPE_SILENT_FIRSTFILL);
                snd_ps3_kick_dma(card);
        }
        /* clear interrupt cause */
        return IRQ_HANDLED;
};

/*
 * module/subsystem initialize/terminate
 */
static int __init snd_ps3_init(void)
{
        int ret;

        if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
                return -ENXIO;

        memset(&the_card, 0, sizeof(the_card));
        spin_lock_init(&the_card.dma_lock);

        /* register systembus DRIVER, this calls our probe() func */
        ret = ps3_system_bus_driver_register(&snd_ps3_bus_driver_info);

        return ret;
}

static void __exit snd_ps3_exit(void)
{
        ps3_system_bus_driver_unregister(&snd_ps3_bus_driver_info);
}

MODULE_ALIAS(PS3_MODULE_ALIAS_SOUND);

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