/* * ALSA PCM interface for the TI DAVINCI processor * * Author: Vladimir Barinov, * Copyright: (C) 2007 MontaVista Software, Inc., * added SRAM ping/pong (C) 2008 Troy Kisky * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "davinci-pcm.h" #ifdef DEBUG static void print_buf_info(int slot, char *name) { struct edmacc_param p; if (slot < 0) return; edma_read_slot(slot, &p); printk(KERN_DEBUG "%s: 0x%x, opt=%x, src=%x, a_b_cnt=%x dst=%x\n", name, slot, p.opt, p.src, p.a_b_cnt, p.dst); printk(KERN_DEBUG " src_dst_bidx=%x link_bcntrld=%x src_dst_cidx=%x ccnt=%x\n", p.src_dst_bidx, p.link_bcntrld, p.src_dst_cidx, p.ccnt); } #else static void print_buf_info(int slot, char *name) { } #endif static struct snd_pcm_hardware pcm_hardware_playback = { .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME), .formats = (SNDRV_PCM_FMTBIT_S16_LE), .rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_KNOT), .rate_min = 8000, .rate_max = 96000, .channels_min = 2, .channels_max = 2, .buffer_bytes_max = 128 * 1024, .period_bytes_min = 32, .period_bytes_max = 8 * 1024, .periods_min = 16, .periods_max = 255, .fifo_size = 0, }; static struct snd_pcm_hardware pcm_hardware_capture = { .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_PAUSE), .formats = (SNDRV_PCM_FMTBIT_S16_LE), .rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_KNOT), .rate_min = 8000, .rate_max = 96000, .channels_min = 2, .channels_max = 2, .buffer_bytes_max = 128 * 1024, .period_bytes_min = 32, .period_bytes_max = 8 * 1024, .periods_min = 16, .periods_max = 255, .fifo_size = 0, }; /* * How ping/pong works.... * * Playback: * ram_params - copys 2*ping_size from start of SDRAM to iram, * links to ram_link2 * ram_link2 - copys rest of SDRAM to iram in ping_size units, * links to ram_link * ram_link - copys entire SDRAM to iram in ping_size uints, * links to self * * asp_params - same as asp_link[0] * asp_link[0] - copys from lower half of iram to asp port * links to asp_link[1], triggers iram copy event on completion * asp_link[1] - copys from upper half of iram to asp port * links to asp_link[0], triggers iram copy event on completion * triggers interrupt only needed to let upper SOC levels update position * in stream on completion * * When playback is started: * ram_params started * asp_params started * * Capture: * ram_params - same as ram_link, * links to ram_link * ram_link - same as playback * links to self * * asp_params - same as playback * asp_link[0] - same as playback * asp_link[1] - same as playback * * When capture is started: * asp_params started */ struct davinci_runtime_data { spinlock_t lock; int period; /* current DMA period */ int asp_channel; /* Master DMA channel */ int asp_link[2]; /* asp parameter link channel, ping/pong */ struct davinci_pcm_dma_params *params; /* DMA params */ int ram_channel; int ram_link; int ram_link2; struct edmacc_param asp_params; struct edmacc_param ram_params; }; /* * Not used with ping/pong */ static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream) { struct davinci_runtime_data *prtd = substream->runtime->private_data; struct snd_pcm_runtime *runtime = substream->runtime; int link = prtd->asp_link[0]; unsigned int period_size; unsigned int dma_offset; dma_addr_t dma_pos; dma_addr_t src, dst; unsigned short src_bidx, dst_bidx; unsigned short src_cidx, dst_cidx; unsigned int data_type; unsigned short acnt; unsigned int count; unsigned int fifo_level; period_size = snd_pcm_lib_period_bytes(substream); dma_offset = prtd->period * period_size; dma_pos = runtime->dma_addr + dma_offset; fifo_level = prtd->params->fifo_level; pr_debug("davinci_pcm: audio_set_dma_params_play channel = %d " "dma_ptr = %x period_size=%x\n", link, dma_pos, period_size); data_type = prtd->params->data_type; count = period_size / data_type; if (fifo_level) count /= fifo_level; if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { src = dma_pos; dst = prtd->params->dma_addr; src_bidx = data_type; dst_bidx = 0; src_cidx = data_type * fifo_level; dst_cidx = 0; } else { src = prtd->params->dma_addr; dst = dma_pos; src_bidx = 0; dst_bidx = data_type; src_cidx = 0; dst_cidx = data_type * fifo_level; } acnt = prtd->params->acnt; edma_set_src(link, src, INCR, W8BIT); edma_set_dest(link, dst, INCR, W8BIT); edma_set_src_index(link, src_bidx, src_cidx); edma_set_dest_index(link, dst_bidx, dst_cidx); if (!fifo_level) edma_set_transfer_params(link, acnt, count, 1, 0, ASYNC); else edma_set_transfer_params(link, acnt, fifo_level, count, fifo_level, ABSYNC); prtd->period++; if (unlikely(prtd->period >= runtime->periods)) prtd->period = 0; } static void davinci_pcm_dma_irq(unsigned link, u16 ch_status, void *data) { struct snd_pcm_substream *substream = data; struct davinci_runtime_data *prtd = substream->runtime->private_data; print_buf_info(prtd->ram_channel, "i ram_channel"); pr_debug("davinci_pcm: link=%d, status=0x%x\n", link, ch_status); if (unlikely(ch_status != DMA_COMPLETE)) return; if (snd_pcm_running(substream)) { if (prtd->ram_channel < 0) { /* No ping/pong must fix up link dma data*/ spin_lock(&prtd->lock); davinci_pcm_enqueue_dma(substream); spin_unlock(&prtd->lock); } snd_pcm_period_elapsed(substream); } } static int allocate_sram(struct snd_pcm_substream *substream, unsigned size, struct snd_pcm_hardware *ppcm) { struct snd_dma_buffer *buf = &substream->dma_buffer; struct snd_dma_buffer *iram_dma = NULL; dma_addr_t iram_phys = 0; void *iram_virt = NULL; if (buf->private_data || !size) return 0; ppcm->period_bytes_max = size; iram_virt = sram_alloc(size, &iram_phys); if (!iram_virt) goto exit1; iram_dma = kzalloc(sizeof(*iram_dma), GFP_KERNEL); if (!iram_dma) goto exit2; iram_dma->area = iram_virt; iram_dma->addr = iram_phys; memset(iram_dma->area, 0, size); iram_dma->bytes = size; buf->private_data = iram_dma; return 0; exit2: if (iram_virt) sram_free(iram_virt, size); exit1: return -ENOMEM; } /* * Only used with ping/pong. * This is called after runtime->dma_addr, period_bytes and data_type are valid */ static int ping_pong_dma_setup(struct snd_pcm_substream *substream) { unsigned short ram_src_cidx, ram_dst_cidx; struct snd_pcm_runtime *runtime = substream->runtime; struct davinci_runtime_data *prtd = runtime->private_data; struct snd_dma_buffer *iram_dma = (struct snd_dma_buffer *)substream->dma_buffer.private_data; struct davinci_pcm_dma_params *params = prtd->params; unsigned int data_type = params->data_type; unsigned int acnt = params->acnt; /* divide by 2 for ping/pong */ unsigned int ping_size = snd_pcm_lib_period_bytes(substream) >> 1; int link = prtd->asp_link[1]; unsigned int fifo_level = prtd->params->fifo_level; unsigned int count; if ((data_type == 0) || (data_type > 4)) { printk(KERN_ERR "%s: data_type=%i\n", __func__, data_type); return -EINVAL; } if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { dma_addr_t asp_src_pong = iram_dma->addr + ping_size; ram_src_cidx = ping_size; ram_dst_cidx = -ping_size; edma_set_src(link, asp_src_pong, INCR, W8BIT); link = prtd->asp_link[0]; edma_set_src_index(link, data_type, data_type * fifo_level); link = prtd->asp_link[1]; edma_set_src_index(link, data_type, data_type * fifo_level); link = prtd->ram_link; edma_set_src(link, runtime->dma_addr, INCR, W32BIT); } else { dma_addr_t asp_dst_pong = iram_dma->addr + ping_size; ram_src_cidx = -ping_size; ram_dst_cidx = ping_size; edma_set_dest(link, asp_dst_pong, INCR, W8BIT); link = prtd->asp_link[0]; edma_set_dest_index(link, data_type, data_type * fifo_level); link = prtd->asp_link[1]; edma_set_dest_index(link, data_type, data_type * fifo_level); link = prtd->ram_link; edma_set_dest(link, runtime->dma_addr, INCR, W32BIT); } if (!fifo_level) { count = ping_size / data_type; edma_set_transfer_params(prtd->asp_link[0], acnt, count, 1, 0, ASYNC); edma_set_transfer_params(prtd->asp_link[1], acnt, count, 1, 0, ASYNC); } else { count = ping_size / (data_type * fifo_level); edma_set_transfer_params(prtd->asp_link[0], acnt, fifo_level, count, fifo_level, ABSYNC); edma_set_transfer_params(prtd->asp_link[1], acnt, fifo_level, count, fifo_level, ABSYNC); } link = prtd->ram_link; edma_set_src_index(link, ping_size, ram_src_cidx); edma_set_dest_index(link, ping_size, ram_dst_cidx); edma_set_transfer_params(link, ping_size, 2, runtime->periods, 2, ASYNC); /* init master params */ edma_read_slot(prtd->asp_link[0], &prtd->asp_params); edma_read_slot(prtd->ram_link, &prtd->ram_params); if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { struct edmacc_param p_ram; /* Copy entire iram buffer before playback started */ prtd->ram_params.a_b_cnt = (1 << 16) | (ping_size << 1); /* 0 dst_bidx */ prtd->ram_params.src_dst_bidx = (ping_size << 1); /* 0 dst_cidx */ prtd->ram_params.src_dst_cidx = (ping_size << 1); prtd->ram_params.ccnt = 1; /* Skip 1st period */ edma_read_slot(prtd->ram_link, &p_ram); p_ram.src += (ping_size << 1); p_ram.ccnt -= 1; edma_write_slot(prtd->ram_link2, &p_ram); /* * When 1st started, ram -> iram dma channel will fill the * entire iram. Then, whenever a ping/pong asp buffer finishes, * 1/2 iram will be filled. */ prtd->ram_params.link_bcntrld = EDMA_CHAN_SLOT(prtd->ram_link2) << 5; } return 0; } /* 1 asp tx or rx channel using 2 parameter channels * 1 ram to/from iram channel using 1 parameter channel * * Playback * ram copy channel kicks off first, * 1st ram copy of entire iram buffer completion kicks off asp channel * asp tcc always kicks off ram copy of 1/2 iram buffer * * Record * asp channel starts, tcc kicks off ram copy */ static int request_ping_pong(struct snd_pcm_substream *substream, struct davinci_runtime_data *prtd, struct snd_dma_buffer *iram_dma) { dma_addr_t asp_src_ping; dma_addr_t asp_dst_ping; int link; struct davinci_pcm_dma_params *params = prtd->params; /* Request ram master channel */ link = prtd->ram_channel = edma_alloc_channel(EDMA_CHANNEL_ANY, davinci_pcm_dma_irq, substream, prtd->params->ram_chan_q); if (link < 0) goto exit1; /* Request ram link channel */ link = prtd->ram_link = edma_alloc_slot( EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY); if (link < 0) goto exit2; link = prtd->asp_link[1] = edma_alloc_slot( EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY); if (link < 0) goto exit3; prtd->ram_link2 = -1; if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { link = prtd->ram_link2 = edma_alloc_slot( EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY); if (link < 0) goto exit4; } /* circle ping-pong buffers */ edma_link(prtd->asp_link[0], prtd->asp_link[1]); edma_link(prtd->asp_link[1], prtd->asp_link[0]); /* circle ram buffers */ edma_link(prtd->ram_link, prtd->ram_link); if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { asp_src_ping = iram_dma->addr; asp_dst_ping = params->dma_addr; /* fifo */ } else { asp_src_ping = params->dma_addr; /* fifo */ asp_dst_ping = iram_dma->addr; } /* ping */ link = prtd->asp_link[0]; edma_set_src(link, asp_src_ping, INCR, W16BIT); edma_set_dest(link, asp_dst_ping, INCR, W16BIT); edma_set_src_index(link, 0, 0); edma_set_dest_index(link, 0, 0); edma_read_slot(link, &prtd->asp_params); prtd->asp_params.opt &= ~(TCCMODE | EDMA_TCC(0x3f) | TCINTEN); prtd->asp_params.opt |= TCCHEN | EDMA_TCC(prtd->ram_channel & 0x3f); edma_write_slot(link, &prtd->asp_params); /* pong */ link = prtd->asp_link[1]; edma_set_src(link, asp_src_ping, INCR, W16BIT); edma_set_dest(link, asp_dst_ping, INCR, W16BIT); edma_set_src_index(link, 0, 0); edma_set_dest_index(link, 0, 0); edma_read_slot(link, &prtd->asp_params); prtd->asp_params.opt &= ~(TCCMODE | EDMA_TCC(0x3f)); /* interrupt after every pong completion */ prtd->asp_params.opt |= TCINTEN | TCCHEN | EDMA_TCC(EDMA_CHAN_SLOT(prtd->ram_channel)); edma_write_slot(link, &prtd->asp_params); /* ram */ link = prtd->ram_link; edma_set_src(link, iram_dma->addr, INCR, W32BIT); edma_set_dest(link, iram_dma->addr, INCR, W32BIT); pr_debug("%s: audio dma channels/slots in use for ram:%u %u %u," "for asp:%u %u %u\n", __func__, prtd->ram_channel, prtd->ram_link, prtd->ram_link2, prtd->asp_channel, prtd->asp_link[0], prtd->asp_link[1]); return 0; exit4: edma_free_channel(prtd->asp_link[1]); prtd->asp_link[1] = -1; exit3: edma_free_channel(prtd->ram_link); prtd->ram_link = -1; exit2: edma_free_channel(prtd->ram_channel); prtd->ram_channel = -1; exit1: return link; } static int davinci_pcm_dma_request(struct snd_pcm_substream *substream) { struct snd_dma_buffer *iram_dma; struct davinci_runtime_data *prtd = substream->runtime->private_data; struct davinci_pcm_dma_params *params = prtd->params; int link; if (!params) return -ENODEV; /* Request asp master DMA channel */ link = prtd->asp_channel = edma_alloc_channel(params->channel, davinci_pcm_dma_irq, substream, prtd->params->asp_chan_q); if (link < 0) goto exit1; /* Request asp link channels */ link = prtd->asp_link[0] = edma_alloc_slot( EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY); if (link < 0) goto exit2; iram_dma = (struct snd_dma_buffer *)substream->dma_buffer.private_data; if (iram_dma) { if (request_ping_pong(substream, prtd, iram_dma) == 0) return 0; printk(KERN_WARNING "%s: dma channel allocation failed," "not using sram\n", __func__); } /* Issue transfer completion IRQ when the channel completes a * transfer, then always reload from the same slot (by a kind * of loopback link). The completion IRQ handler will update * the reload slot with a new buffer. * * REVISIT save p_ram here after setting up everything except * the buffer and its length (ccnt) ... use it as a template * so davinci_pcm_enqueue_dma() takes less time in IRQ. */ edma_read_slot(link, &prtd->asp_params); prtd->asp_params.opt |= TCINTEN | EDMA_TCC(EDMA_CHAN_SLOT(prtd->asp_channel)); prtd->asp_params.link_bcntrld = EDMA_CHAN_SLOT(link) << 5; edma_write_slot(link, &prtd->asp_params); return 0; exit2: edma_free_channel(prtd->asp_channel); prtd->asp_channel = -1; exit1: return link; } static int davinci_pcm_trigger(struct snd_pcm_substream *substream, int cmd) { struct davinci_runtime_data *prtd = substream->runtime->private_data; int ret = 0; spin_lock(&prtd->lock); switch (cmd) { case SNDRV_PCM_TRIGGER_START: case SNDRV_PCM_TRIGGER_RESUME: case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: edma_resume(prtd->asp_channel); break; case SNDRV_PCM_TRIGGER_STOP: case SNDRV_PCM_TRIGGER_SUSPEND: case SNDRV_PCM_TRIGGER_PAUSE_PUSH: edma_pause(prtd->asp_channel); break; default: ret = -EINVAL; break; } spin_unlock(&prtd->lock); return ret; } static int davinci_pcm_prepare(struct snd_pcm_substream *substream) { struct davinci_runtime_data *prtd = substream->runtime->private_data; if (prtd->ram_channel >= 0) { int ret = ping_pong_dma_setup(substream); if (ret < 0) return ret; edma_write_slot(prtd->ram_channel, &prtd->ram_params); edma_write_slot(prtd->asp_channel, &prtd->asp_params); print_buf_info(prtd->ram_channel, "ram_channel"); print_buf_info(prtd->ram_link, "ram_link"); print_buf_info(prtd->ram_link2, "ram_link2"); print_buf_info(prtd->asp_channel, "asp_channel"); print_buf_info(prtd->asp_link[0], "asp_link[0]"); print_buf_info(prtd->asp_link[1], "asp_link[1]"); if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { /* copy 1st iram buffer */ edma_start(prtd->ram_channel); } edma_start(prtd->asp_channel); return 0; } prtd->period = 0; davinci_pcm_enqueue_dma(substream); /* Copy self-linked parameter RAM entry into master channel */ edma_read_slot(prtd->asp_link[0], &prtd->asp_params); edma_write_slot(prtd->asp_channel, &prtd->asp_params); davinci_pcm_enqueue_dma(substream); edma_start(prtd->asp_channel); return 0; } static snd_pcm_uframes_t davinci_pcm_pointer(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; struct davinci_runtime_data *prtd = runtime->private_data; unsigned int offset; int asp_count; dma_addr_t asp_src, asp_dst; spin_lock(&prtd->lock); if (prtd->ram_channel >= 0) { int ram_count; int mod_ram; dma_addr_t ram_src, ram_dst; unsigned int period_size = snd_pcm_lib_period_bytes(substream); if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { /* reading ram before asp should be safe * as long as the asp transfers less than a ping size * of bytes between the 2 reads */ edma_get_position(prtd->ram_channel, &ram_src, &ram_dst); edma_get_position(prtd->asp_channel, &asp_src, &asp_dst); asp_count = asp_src - prtd->asp_params.src; ram_count = ram_src - prtd->ram_params.src; mod_ram = ram_count % period_size; mod_ram -= asp_count; if (mod_ram < 0) mod_ram += period_size; else if (mod_ram == 0) { if (snd_pcm_running(substream)) mod_ram += period_size; } ram_count -= mod_ram; if (ram_count < 0) ram_count += period_size * runtime->periods; } else { edma_get_position(prtd->ram_channel, &ram_src, &ram_dst); ram_count = ram_dst - prtd->ram_params.dst; } asp_count = ram_count; } else { edma_get_position(prtd->asp_channel, &asp_src, &asp_dst); if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) asp_count = asp_src - runtime->dma_addr; else asp_count = asp_dst - runtime->dma_addr; } spin_unlock(&prtd->lock); offset = bytes_to_frames(runtime, asp_count); if (offset >= runtime->buffer_size) offset = 0; return offset; } static int davinci_pcm_open(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; struct davinci_runtime_data *prtd; struct snd_pcm_hardware *ppcm; int ret = 0; struct snd_soc_pcm_runtime *rtd = substream->private_data; struct davinci_pcm_dma_params *pa; struct davinci_pcm_dma_params *params; pa = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); if (!pa) return -ENODEV; params = &pa[substream->stream]; ppcm = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? &pcm_hardware_playback : &pcm_hardware_capture; allocate_sram(substream, params->sram_size, ppcm); snd_soc_set_runtime_hwparams(substream, ppcm); /* ensure that buffer size is a multiple of period size */ ret = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); if (ret < 0) return ret; prtd = kzalloc(sizeof(struct davinci_runtime_data), GFP_KERNEL); if (prtd == NULL) return -ENOMEM; spin_lock_init(&prtd->lock); prtd->params = params; prtd->asp_channel = -1; prtd->asp_link[0] = prtd->asp_link[1] = -1; prtd->ram_channel = -1; prtd->ram_link = -1; prtd->ram_link2 = -1; runtime->private_data = prtd; ret = davinci_pcm_dma_request(substream); if (ret) { printk(KERN_ERR "davinci_pcm: Failed to get dma channels\n"); kfree(prtd); } return ret; } static int davinci_pcm_close(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; struct davinci_runtime_data *prtd = runtime->private_data; if (prtd->ram_channel >= 0) edma_stop(prtd->ram_channel); if (prtd->asp_channel >= 0) edma_stop(prtd->asp_channel); if (prtd->asp_link[0] >= 0) edma_unlink(prtd->asp_link[0]); if (prtd->asp_link[1] >= 0) edma_unlink(prtd->asp_link[1]); if (prtd->ram_link >= 0) edma_unlink(prtd->ram_link); if (prtd->asp_link[0] >= 0) edma_free_slot(prtd->asp_link[0]); if (prtd->asp_link[1] >= 0) edma_free_slot(prtd->asp_link[1]); if (prtd->asp_channel >= 0) edma_free_channel(prtd->asp_channel); if (prtd->ram_link >= 0) edma_free_slot(prtd->ram_link); if (prtd->ram_link2 >= 0) edma_free_slot(prtd->ram_link2); if (prtd->ram_channel >= 0) edma_free_channel(prtd->ram_channel); kfree(prtd); return 0; } static int davinci_pcm_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *hw_params) { return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params)); } static int davinci_pcm_hw_free(struct snd_pcm_substream *substream) { return snd_pcm_lib_free_pages(substream); } static int davinci_pcm_mmap(struct snd_pcm_substream *substream, struct vm_area_struct *vma) { struct snd_pcm_runtime *runtime = substream->runtime; return dma_mmap_writecombine(substream->pcm->card->dev, vma, runtime->dma_area, runtime->dma_addr, runtime->dma_bytes); } static struct snd_pcm_ops davinci_pcm_ops = { .open = davinci_pcm_open, .close = davinci_pcm_close, .ioctl = snd_pcm_lib_ioctl, .hw_params = davinci_pcm_hw_params, .hw_free = davinci_pcm_hw_free, .prepare = davinci_pcm_prepare, .trigger = davinci_pcm_trigger, .pointer = davinci_pcm_pointer, .mmap = davinci_pcm_mmap, }; static int davinci_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream, size_t size) { struct snd_pcm_substream *substream = pcm->streams[stream].substream; struct snd_dma_buffer *buf = &substream->dma_buffer; buf->dev.type = SNDRV_DMA_TYPE_DEV; buf->dev.dev = pcm->card->dev; buf->private_data = NULL; buf->area = dma_alloc_writecombine(pcm->card->dev, size, &buf->addr, GFP_KERNEL); pr_debug("davinci_pcm: preallocate_dma_buffer: area=%p, addr=%p, " "size=%d\n", (void *) buf->area, (void *) buf->addr, size); if (!buf->area) return -ENOMEM; buf->bytes = size; return 0; } static void davinci_pcm_free(struct snd_pcm *pcm) { struct snd_pcm_substream *substream; struct snd_dma_buffer *buf; int stream; for (stream = 0; stream < 2; stream++) { struct snd_dma_buffer *iram_dma; substream = pcm->streams[stream].substream; if (!substream) continue; buf = &substream->dma_buffer; if (!buf->area) continue; dma_free_writecombine(pcm->card->dev, buf->bytes, buf->area, buf->addr); buf->area = NULL; iram_dma = buf->private_data; if (iram_dma) { sram_free(iram_dma->area, iram_dma->bytes); kfree(iram_dma); } } } static u64 davinci_pcm_dmamask = 0xffffffff; static int davinci_pcm_new(struct snd_card *card, struct snd_soc_dai *dai, struct snd_pcm *pcm) { int ret; if (!card->dev->dma_mask) card->dev->dma_mask = &davinci_pcm_dmamask; if (!card->dev->coherent_dma_mask) card->dev->coherent_dma_mask = 0xffffffff; if (dai->driver->playback.channels_min) { ret = davinci_pcm_preallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK, pcm_hardware_playback.buffer_bytes_max); if (ret) return ret; } if (dai->driver->capture.channels_min) { ret = davinci_pcm_preallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_CAPTURE, pcm_hardware_capture.buffer_bytes_max); if (ret) return ret; } return 0; } static struct snd_soc_platform_driver davinci_soc_platform = { .ops = &davinci_pcm_ops, .pcm_new = davinci_pcm_new, .pcm_free = davinci_pcm_free, }; static int __devinit davinci_soc_platform_probe(struct platform_device *pdev) { return snd_soc_register_platform(&pdev->dev, &davinci_soc_platform); } static int __devexit davinci_soc_platform_remove(struct platform_device *pdev) { snd_soc_unregister_platform(&pdev->dev); return 0; } static struct platform_driver davinci_pcm_driver = { .driver = { .name = "davinci-pcm-audio", .owner = THIS_MODULE, }, .probe = davinci_soc_platform_probe, .remove = __devexit_p(davinci_soc_platform_remove), }; static int __init snd_davinci_pcm_init(void) { return platform_driver_register(&davinci_pcm_driver); } module_init(snd_davinci_pcm_init); static void __exit snd_davinci_pcm_exit(void) { platform_driver_unregister(&davinci_pcm_driver); } module_exit(snd_davinci_pcm_exit); MODULE_AUTHOR("Vladimir Barinov"); MODULE_DESCRIPTION("TI DAVINCI PCM DMA module"); MODULE_LICENSE("GPL");