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(); }
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; }
static void snd_ps3_kick_dma(struct snd_ps3_card_info *card) { update_reg(PS3_AUDIO_KICK(0), PS3_AUDIO_KICK_REQUEST); wmb(); }
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; };
/* * 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; }
static int snd_ps3_program_dma(struct snd_ps3_card_info *card, enum snd_ps3_dma_filltype filltype) { uint32_t dma_addr; int fill_stages, dma_ch, stage; enum snd_ps3_ch ch; uint32_t ch0_kick_event = 0; void *start_vaddr; unsigned long irqsave; int silent = 0; switch (filltype) { case SND_PS3_DMA_FILLTYPE_SILENT_FIRSTFILL: silent = 1; case SND_PS3_DMA_FILLTYPE_FIRSTFILL: ch0_kick_event = PS3_AUDIO_KICK_EVENT_ALWAYS; break; case SND_PS3_DMA_FILLTYPE_SILENT_RUNNING: silent = 1; 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)); 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))); write_reg(PS3_AUDIO_DMASIZE(dma_ch), 0); if (!silent) snd_ps3_bump_buffer(card, ch, PS3_AUDIO_DMAC_BLOCK_SIZE, stage); 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); } } wmb(); spin_unlock_irqrestore(&card->dma_lock, irqsave); return 0; }