+++ /dev/null
-/*
- * ALSA PCM interface for the TI DAVINCI processor
- *
- * Author: Vladimir Barinov, <vbarinov@embeddedalley.com>
- * Copyright: (C) 2007 MontaVista Software, Inc., <source@mvista.com>
- * added SRAM ping/pong (C) 2008 Troy Kisky <troy.kisky@boundarydevices.com>
- *
- * 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 <linux/module.h>
-#include <linux/init.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/dma-mapping.h>
-#include <linux/kernel.h>
-#include <linux/genalloc.h>
-#include <linux/platform_data/edma.h>
-
-#include <sound/core.h>
-#include <sound/pcm.h>
-#include <sound/pcm_params.h>
-#include <sound/soc.h>
-
-#include <asm/dma.h>
-
-#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|
- SNDRV_PCM_INFO_BATCH),
- .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 |
- SNDRV_PCM_INFO_BATCH),
- .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;
-};
-
-static void davinci_pcm_period_elapsed(struct snd_pcm_substream *substream)
-{
- struct davinci_runtime_data *prtd = substream->runtime->private_data;
- struct snd_pcm_runtime *runtime = substream->runtime;
-
- prtd->period++;
- if (unlikely(prtd->period >= runtime->periods))
- prtd->period = 0;
-}
-
-static void davinci_pcm_period_reset(struct snd_pcm_substream *substream)
-{
- struct davinci_runtime_data *prtd = substream->runtime->private_data;
-
- prtd->period = 0;
-}
-/*
- * 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;
- 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", prtd->asp_link[0], 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 = 4;
- 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(prtd->asp_link[0], src, INCR, W8BIT);
- edma_set_dest(prtd->asp_link[0], dst, INCR, W8BIT);
-
- edma_set_src_index(prtd->asp_link[0], src_bidx, src_cidx);
- edma_set_dest_index(prtd->asp_link[0], dst_bidx, dst_cidx);
-
- if (!fifo_level)
- edma_set_transfer_params(prtd->asp_link[0], acnt, count, 1, 0,
- ASYNC);
- else
- edma_set_transfer_params(prtd->asp_link[0], acnt,
- fifo_level,
- count, fifo_level,
- ABSYNC);
-}
-
-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 != EDMA_DMA_COMPLETE))
- return;
-
- if (snd_pcm_running(substream)) {
- spin_lock(&prtd->lock);
- if (prtd->ram_channel < 0) {
- /* No ping/pong must fix up link dma data*/
- davinci_pcm_enqueue_dma(substream);
- }
- davinci_pcm_period_elapsed(substream);
- spin_unlock(&prtd->lock);
- snd_pcm_period_elapsed(substream);
- }
-}
-
-#ifdef CONFIG_GENERIC_ALLOCATOR
-static int allocate_sram(struct snd_pcm_substream *substream,
- struct gen_pool *sram_pool, 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 = gen_pool_dma_alloc(sram_pool, 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)
- gen_pool_free(sram_pool, (unsigned)iram_virt, size);
-exit1:
- return -ENOMEM;
-}
-
-static void davinci_free_sram(struct snd_pcm_substream *substream,
- struct snd_dma_buffer *iram_dma)
-{
- struct davinci_runtime_data *prtd = substream->runtime->private_data;
- struct gen_pool *sram_pool = prtd->params->sram_pool;
-
- gen_pool_free(sram_pool, (unsigned) iram_dma->area, iram_dma->bytes);
-}
-#else
-static int allocate_sram(struct snd_pcm_substream *substream,
- struct gen_pool *sram_pool, unsigned size,
- struct snd_pcm_hardware *ppcm)
-{
- return 0;
-}
-
-static void davinci_free_sram(struct snd_pcm_substream *substream,
- struct snd_dma_buffer *iram_dma)
-{
-}
-#endif
-
-/*
- * 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;
- 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(prtd->asp_link[1], asp_src_pong, INCR, W8BIT);
-
- edma_set_src_index(prtd->asp_link[0], data_type,
- data_type * fifo_level);
- edma_set_src_index(prtd->asp_link[1], data_type,
- data_type * fifo_level);
-
- edma_set_src(prtd->ram_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(prtd->asp_link[1], asp_dst_pong, INCR, W8BIT);
-
- edma_set_dest_index(prtd->asp_link[0], data_type,
- data_type * fifo_level);
- edma_set_dest_index(prtd->asp_link[1], data_type,
- data_type * fifo_level);
-
- edma_set_dest(prtd->ram_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);
- }
-
- edma_set_src_index(prtd->ram_link, ping_size, ram_src_cidx);
- edma_set_dest_index(prtd->ram_link, ping_size, ram_dst_cidx);
- edma_set_transfer_params(prtd->ram_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 ret;
- struct davinci_pcm_dma_params *params = prtd->params;
-
- /* Request ram master channel */
- ret = prtd->ram_channel = edma_alloc_channel(EDMA_CHANNEL_ANY,
- davinci_pcm_dma_irq, substream,
- prtd->params->ram_chan_q);
- if (ret < 0)
- goto exit1;
-
- /* Request ram link channel */
- ret = prtd->ram_link = edma_alloc_slot(
- EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY);
- if (ret < 0)
- goto exit2;
-
- ret = prtd->asp_link[1] = edma_alloc_slot(
- EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
- if (ret < 0)
- goto exit3;
-
- prtd->ram_link2 = -1;
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
- ret = prtd->ram_link2 = edma_alloc_slot(
- EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY);
- if (ret < 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 */
- edma_set_src(prtd->asp_link[0], asp_src_ping, INCR, W16BIT);
- edma_set_dest(prtd->asp_link[0], asp_dst_ping, INCR, W16BIT);
- edma_set_src_index(prtd->asp_link[0], 0, 0);
- edma_set_dest_index(prtd->asp_link[0], 0, 0);
-
- edma_read_slot(prtd->asp_link[0], &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(prtd->asp_link[0], &prtd->asp_params);
-
- /* pong */
- edma_set_src(prtd->asp_link[1], asp_src_ping, INCR, W16BIT);
- edma_set_dest(prtd->asp_link[1], asp_dst_ping, INCR, W16BIT);
- edma_set_src_index(prtd->asp_link[1], 0, 0);
- edma_set_dest_index(prtd->asp_link[1], 0, 0);
-
- edma_read_slot(prtd->asp_link[1], &prtd->asp_params);
- prtd->asp_params.opt &= ~(TCCMODE | EDMA_TCC(0x3f));
- /* interrupt after every pong completion */
- prtd->asp_params.opt |= TCINTEN | TCCHEN |
- EDMA_TCC(prtd->ram_channel & 0x3f);
- edma_write_slot(prtd->asp_link[1], &prtd->asp_params);
-
- /* ram */
- edma_set_src(prtd->ram_link, iram_dma->addr, INCR, W32BIT);
- edma_set_dest(prtd->ram_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 ret;
-}
-
-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 ret;
-
- if (!params)
- return -ENODEV;
-
- /* Request asp master DMA channel */
- ret = prtd->asp_channel = edma_alloc_channel(params->channel,
- davinci_pcm_dma_irq, substream,
- prtd->params->asp_chan_q);
- if (ret < 0)
- goto exit1;
-
- /* Request asp link channels */
- ret = prtd->asp_link[0] = edma_alloc_slot(
- EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
- if (ret < 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(prtd->asp_link[0], &prtd->asp_params);
- prtd->asp_params.opt |= TCINTEN |
- EDMA_TCC(EDMA_CHAN_SLOT(prtd->asp_channel));
- prtd->asp_params.link_bcntrld = EDMA_CHAN_SLOT(prtd->asp_link[0]) << 5;
- edma_write_slot(prtd->asp_link[0], &prtd->asp_params);
- return 0;
-exit2:
- edma_free_channel(prtd->asp_channel);
- prtd->asp_channel = -1;
-exit1:
- return ret;
-}
-
-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:
- edma_start(prtd->asp_channel);
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
- prtd->ram_channel >= 0) {
- /* copy 1st iram buffer */
- edma_start(prtd->ram_channel);
- }
- break;
- 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;
-
- davinci_pcm_period_reset(substream);
- 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]");
-
- /*
- * There is a phase offset of 2 periods between the position
- * used by dma setup and the position reported in the pointer
- * function.
- *
- * The phase offset, when not using ping-pong buffers, is due to
- * the two consecutive calls to davinci_pcm_enqueue_dma() below.
- *
- * Whereas here, with ping-pong buffers, the phase is due to
- * there being an entire buffer transfer complete before the
- * first dma completion event triggers davinci_pcm_dma_irq().
- */
- davinci_pcm_period_elapsed(substream);
- davinci_pcm_period_elapsed(substream);
-
- return 0;
- }
- davinci_pcm_enqueue_dma(substream);
- davinci_pcm_period_elapsed(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);
- davinci_pcm_period_elapsed(substream);
-
- 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;
- unsigned int period_size = snd_pcm_lib_period_bytes(substream);
-
- /*
- * There is a phase offset of 2 periods between the position used by dma
- * setup and the position reported in the pointer function. Either +2 in
- * the dma setup or -2 here in the pointer function (with wrapping,
- * both) accounts for this offset -- choose the latter since it makes
- * the first-time setup clearer.
- */
- spin_lock(&prtd->lock);
- asp_count = prtd->period - 2;
- spin_unlock(&prtd->lock);
-
- if (asp_count < 0)
- asp_count += runtime->periods;
- asp_count *= period_size;
-
- 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_pool, 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) {
- davinci_free_sram(substream, iram_dma);
- kfree(iram_dma);
- }
- }
-}
-
-static int davinci_pcm_new(struct snd_soc_pcm_runtime *rtd)
-{
- struct snd_card *card = rtd->card->snd_card;
- struct snd_pcm *pcm = rtd->pcm;
- int ret;
-
- ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
- if (ret)
- return ret;
-
- if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
- ret = davinci_pcm_preallocate_dma_buffer(pcm,
- SNDRV_PCM_STREAM_PLAYBACK,
- pcm_hardware_playback.buffer_bytes_max);
- if (ret)
- return ret;
- }
-
- if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
- 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,
-};
-
-int davinci_soc_platform_register(struct device *dev)
-{
- return devm_snd_soc_register_platform(dev, &davinci_soc_platform);
-}
-EXPORT_SYMBOL_GPL(davinci_soc_platform_register);
-
-MODULE_AUTHOR("Vladimir Barinov");
-MODULE_DESCRIPTION("TI DAVINCI PCM DMA module");
-MODULE_LICENSE("GPL");
projects / GitHub / LineageOS / android_kernel_motorola_exynos9610.git / commitdiff