diff options
Diffstat (limited to 'sound/soc/sh/siu_pcm.c')
-rw-r--r-- | sound/soc/sh/siu_pcm.c | 616 |
1 files changed, 616 insertions, 0 deletions
diff --git a/sound/soc/sh/siu_pcm.c b/sound/soc/sh/siu_pcm.c new file mode 100644 index 000000000000..ba7f8d05d977 --- /dev/null +++ b/sound/soc/sh/siu_pcm.c @@ -0,0 +1,616 @@ +/* + * siu_pcm.c - ALSA driver for Renesas SH7343, SH7722 SIU peripheral. + * + * Copyright (C) 2009-2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de> + * Copyright (C) 2006 Carlos Munoz <carlos@kenati.com> + * + * 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; either version 2 of the License, or + * (at your option) any later version. + * + * 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., 675 Mass Ave, Cambridge, MA 02139, USA. + */ +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +#include <sound/control.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/soc-dai.h> + +#include <asm/dmaengine.h> +#include <asm/siu.h> + +#include "siu.h" + +#define GET_MAX_PERIODS(buf_bytes, period_bytes) \ + ((buf_bytes) / (period_bytes)) +#define PERIOD_OFFSET(buf_addr, period_num, period_bytes) \ + ((buf_addr) + ((period_num) * (period_bytes))) + +#define RWF_STM_RD 0x01 /* Read in progress */ +#define RWF_STM_WT 0x02 /* Write in progress */ + +struct siu_port *siu_ports[SIU_PORT_NUM]; + +/* transfersize is number of u32 dma transfers per period */ +static int siu_pcm_stmwrite_stop(struct siu_port *port_info) +{ + struct siu_info *info = siu_i2s_dai.private_data; + u32 __iomem *base = info->reg; + struct siu_stream *siu_stream = &port_info->playback; + u32 stfifo; + + if (!siu_stream->rw_flg) + return -EPERM; + + /* output FIFO disable */ + stfifo = siu_read32(base + SIU_STFIFO); + siu_write32(base + SIU_STFIFO, stfifo & ~0x0c180c18); + pr_debug("%s: STFIFO %x -> %x\n", __func__, + stfifo, stfifo & ~0x0c180c18); + + /* during stmwrite clear */ + siu_stream->rw_flg = 0; + + return 0; +} + +static int siu_pcm_stmwrite_start(struct siu_port *port_info) +{ + struct siu_stream *siu_stream = &port_info->playback; + + if (siu_stream->rw_flg) + return -EPERM; + + /* Current period in buffer */ + port_info->playback.cur_period = 0; + + /* during stmwrite flag set */ + siu_stream->rw_flg = RWF_STM_WT; + + /* DMA transfer start */ + tasklet_schedule(&siu_stream->tasklet); + + return 0; +} + +static void siu_dma_tx_complete(void *arg) +{ + struct siu_stream *siu_stream = arg; + + if (!siu_stream->rw_flg) + return; + + /* Update completed period count */ + if (++siu_stream->cur_period >= + GET_MAX_PERIODS(siu_stream->buf_bytes, + siu_stream->period_bytes)) + siu_stream->cur_period = 0; + + pr_debug("%s: done period #%d (%u/%u bytes), cookie %d\n", + __func__, siu_stream->cur_period, + siu_stream->cur_period * siu_stream->period_bytes, + siu_stream->buf_bytes, siu_stream->cookie); + + tasklet_schedule(&siu_stream->tasklet); + + /* Notify alsa: a period is done */ + snd_pcm_period_elapsed(siu_stream->substream); +} + +static int siu_pcm_wr_set(struct siu_port *port_info, + dma_addr_t buff, u32 size) +{ + struct siu_info *info = siu_i2s_dai.private_data; + u32 __iomem *base = info->reg; + struct siu_stream *siu_stream = &port_info->playback; + struct snd_pcm_substream *substream = siu_stream->substream; + struct device *dev = substream->pcm->card->dev; + struct dma_async_tx_descriptor *desc; + dma_cookie_t cookie; + struct scatterlist sg; + u32 stfifo; + + sg_init_table(&sg, 1); + sg_set_page(&sg, pfn_to_page(PFN_DOWN(buff)), + size, offset_in_page(buff)); + sg_dma_address(&sg) = buff; + + desc = siu_stream->chan->device->device_prep_slave_sg(siu_stream->chan, + &sg, 1, DMA_TO_DEVICE, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!desc) { + dev_err(dev, "Failed to allocate a dma descriptor\n"); + return -ENOMEM; + } + + desc->callback = siu_dma_tx_complete; + desc->callback_param = siu_stream; + cookie = desc->tx_submit(desc); + if (cookie < 0) { + dev_err(dev, "Failed to submit a dma transfer\n"); + return cookie; + } + + siu_stream->tx_desc = desc; + siu_stream->cookie = cookie; + + dma_async_issue_pending(siu_stream->chan); + + /* only output FIFO enable */ + stfifo = siu_read32(base + SIU_STFIFO); + siu_write32(base + SIU_STFIFO, stfifo | (port_info->stfifo & 0x0c180c18)); + dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__, + stfifo, stfifo | (port_info->stfifo & 0x0c180c18)); + + return 0; +} + +static int siu_pcm_rd_set(struct siu_port *port_info, + dma_addr_t buff, size_t size) +{ + struct siu_info *info = siu_i2s_dai.private_data; + u32 __iomem *base = info->reg; + struct siu_stream *siu_stream = &port_info->capture; + struct snd_pcm_substream *substream = siu_stream->substream; + struct device *dev = substream->pcm->card->dev; + struct dma_async_tx_descriptor *desc; + dma_cookie_t cookie; + struct scatterlist sg; + u32 stfifo; + + dev_dbg(dev, "%s: %u@%llx\n", __func__, size, (unsigned long long)buff); + + sg_init_table(&sg, 1); + sg_set_page(&sg, pfn_to_page(PFN_DOWN(buff)), + size, offset_in_page(buff)); + sg_dma_address(&sg) = buff; + + desc = siu_stream->chan->device->device_prep_slave_sg(siu_stream->chan, + &sg, 1, DMA_FROM_DEVICE, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!desc) { + dev_err(dev, "Failed to allocate dma descriptor\n"); + return -ENOMEM; + } + + desc->callback = siu_dma_tx_complete; + desc->callback_param = siu_stream; + cookie = desc->tx_submit(desc); + if (cookie < 0) { + dev_err(dev, "Failed to submit dma descriptor\n"); + return cookie; + } + + siu_stream->tx_desc = desc; + siu_stream->cookie = cookie; + + dma_async_issue_pending(siu_stream->chan); + + /* only input FIFO enable */ + stfifo = siu_read32(base + SIU_STFIFO); + siu_write32(base + SIU_STFIFO, siu_read32(base + SIU_STFIFO) | + (port_info->stfifo & 0x13071307)); + dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__, + stfifo, stfifo | (port_info->stfifo & 0x13071307)); + + return 0; +} + +static void siu_io_tasklet(unsigned long data) +{ + struct siu_stream *siu_stream = (struct siu_stream *)data; + struct snd_pcm_substream *substream = siu_stream->substream; + struct device *dev = substream->pcm->card->dev; + struct snd_pcm_runtime *rt = substream->runtime; + struct siu_port *port_info = siu_port_info(substream); + + dev_dbg(dev, "%s: flags %x\n", __func__, siu_stream->rw_flg); + + if (!siu_stream->rw_flg) { + dev_dbg(dev, "%s: stream inactive\n", __func__); + return; + } + + if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { + dma_addr_t buff; + size_t count; + u8 *virt; + + buff = (dma_addr_t)PERIOD_OFFSET(rt->dma_addr, + siu_stream->cur_period, + siu_stream->period_bytes); + virt = PERIOD_OFFSET(rt->dma_area, + siu_stream->cur_period, + siu_stream->period_bytes); + count = siu_stream->period_bytes; + + /* DMA transfer start */ + siu_pcm_rd_set(port_info, buff, count); + } else { + siu_pcm_wr_set(port_info, + (dma_addr_t)PERIOD_OFFSET(rt->dma_addr, + siu_stream->cur_period, + siu_stream->period_bytes), + siu_stream->period_bytes); + } +} + +/* Capture */ +static int siu_pcm_stmread_start(struct siu_port *port_info) +{ + struct siu_stream *siu_stream = &port_info->capture; + + if (siu_stream->xfer_cnt > 0x1000000) + return -EINVAL; + if (siu_stream->rw_flg) + return -EPERM; + + /* Current period in buffer */ + siu_stream->cur_period = 0; + + /* during stmread flag set */ + siu_stream->rw_flg = RWF_STM_RD; + + tasklet_schedule(&siu_stream->tasklet); + + return 0; +} + +static int siu_pcm_stmread_stop(struct siu_port *port_info) +{ + struct siu_info *info = siu_i2s_dai.private_data; + u32 __iomem *base = info->reg; + struct siu_stream *siu_stream = &port_info->capture; + struct device *dev = siu_stream->substream->pcm->card->dev; + u32 stfifo; + + if (!siu_stream->rw_flg) + return -EPERM; + + /* input FIFO disable */ + stfifo = siu_read32(base + SIU_STFIFO); + siu_write32(base + SIU_STFIFO, stfifo & ~0x13071307); + dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__, + stfifo, stfifo & ~0x13071307); + + /* during stmread flag clear */ + siu_stream->rw_flg = 0; + + return 0; +} + +static int siu_pcm_hw_params(struct snd_pcm_substream *ss, + struct snd_pcm_hw_params *hw_params) +{ + struct siu_info *info = siu_i2s_dai.private_data; + struct device *dev = ss->pcm->card->dev; + int ret; + + dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id); + + ret = snd_pcm_lib_malloc_pages(ss, params_buffer_bytes(hw_params)); + if (ret < 0) + dev_err(dev, "snd_pcm_lib_malloc_pages() failed\n"); + + return ret; +} + +static int siu_pcm_hw_free(struct snd_pcm_substream *ss) +{ + struct siu_info *info = siu_i2s_dai.private_data; + struct siu_port *port_info = siu_port_info(ss); + struct device *dev = ss->pcm->card->dev; + struct siu_stream *siu_stream; + + if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) + siu_stream = &port_info->playback; + else + siu_stream = &port_info->capture; + + dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id); + + return snd_pcm_lib_free_pages(ss); +} + +static bool filter(struct dma_chan *chan, void *slave) +{ + struct sh_dmae_slave *param = slave; + + pr_debug("%s: slave ID %d\n", __func__, param->slave_id); + + if (unlikely(param->dma_dev != chan->device->dev)) + return false; + + chan->private = param; + return true; +} + +static int siu_pcm_open(struct snd_pcm_substream *ss) +{ + /* Playback / Capture */ + struct siu_info *info = siu_i2s_dai.private_data; + struct siu_port *port_info = siu_port_info(ss); + struct siu_stream *siu_stream; + u32 port = info->port_id; + struct siu_platform *pdata = siu_i2s_dai.dev->platform_data; + struct device *dev = ss->pcm->card->dev; + dma_cap_mask_t mask; + struct sh_dmae_slave *param; + + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + + dev_dbg(dev, "%s, port=%d@%p\n", __func__, port, port_info); + + if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) { + siu_stream = &port_info->playback; + param = &siu_stream->param; + param->slave_id = port ? SHDMA_SLAVE_SIUB_TX : + SHDMA_SLAVE_SIUA_TX; + } else { + siu_stream = &port_info->capture; + param = &siu_stream->param; + param->slave_id = port ? SHDMA_SLAVE_SIUB_RX : + SHDMA_SLAVE_SIUA_RX; + } + + param->dma_dev = pdata->dma_dev; + /* Get DMA channel */ + siu_stream->chan = dma_request_channel(mask, filter, param); + if (!siu_stream->chan) { + dev_err(dev, "DMA channel allocation failed!\n"); + return -EBUSY; + } + + siu_stream->substream = ss; + + return 0; +} + +static int siu_pcm_close(struct snd_pcm_substream *ss) +{ + struct siu_info *info = siu_i2s_dai.private_data; + struct device *dev = ss->pcm->card->dev; + struct siu_port *port_info = siu_port_info(ss); + struct siu_stream *siu_stream; + + dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id); + + if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) + siu_stream = &port_info->playback; + else + siu_stream = &port_info->capture; + + dma_release_channel(siu_stream->chan); + siu_stream->chan = NULL; + + siu_stream->substream = NULL; + + return 0; +} + +static int siu_pcm_prepare(struct snd_pcm_substream *ss) +{ + struct siu_info *info = siu_i2s_dai.private_data; + struct siu_port *port_info = siu_port_info(ss); + struct device *dev = ss->pcm->card->dev; + struct snd_pcm_runtime *rt = ss->runtime; + struct siu_stream *siu_stream; + snd_pcm_sframes_t xfer_cnt; + + if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) + siu_stream = &port_info->playback; + else + siu_stream = &port_info->capture; + + rt = siu_stream->substream->runtime; + + siu_stream->buf_bytes = snd_pcm_lib_buffer_bytes(ss); + siu_stream->period_bytes = snd_pcm_lib_period_bytes(ss); + + dev_dbg(dev, "%s: port=%d, %d channels, period=%u bytes\n", __func__, + info->port_id, rt->channels, siu_stream->period_bytes); + + /* We only support buffers that are multiples of the period */ + if (siu_stream->buf_bytes % siu_stream->period_bytes) { + dev_err(dev, "%s() - buffer=%d not multiple of period=%d\n", + __func__, siu_stream->buf_bytes, + siu_stream->period_bytes); + return -EINVAL; + } + + xfer_cnt = bytes_to_frames(rt, siu_stream->period_bytes); + if (!xfer_cnt || xfer_cnt > 0x1000000) + return -EINVAL; + + siu_stream->format = rt->format; + siu_stream->xfer_cnt = xfer_cnt; + + dev_dbg(dev, "port=%d buf=%lx buf_bytes=%d period_bytes=%d " + "format=%d channels=%d xfer_cnt=%d\n", info->port_id, + (unsigned long)rt->dma_addr, siu_stream->buf_bytes, + siu_stream->period_bytes, + siu_stream->format, rt->channels, (int)xfer_cnt); + + return 0; +} + +static int siu_pcm_trigger(struct snd_pcm_substream *ss, int cmd) +{ + struct siu_info *info = siu_i2s_dai.private_data; + struct device *dev = ss->pcm->card->dev; + struct siu_port *port_info = siu_port_info(ss); + int ret; + + dev_dbg(dev, "%s: port=%d@%p, cmd=%d\n", __func__, + info->port_id, port_info, cmd); + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) + ret = siu_pcm_stmwrite_start(port_info); + else + ret = siu_pcm_stmread_start(port_info); + + if (ret < 0) + dev_warn(dev, "%s: start failed on port=%d\n", + __func__, info->port_id); + + break; + case SNDRV_PCM_TRIGGER_STOP: + if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) + siu_pcm_stmwrite_stop(port_info); + else + siu_pcm_stmread_stop(port_info); + ret = 0; + + break; + default: + dev_err(dev, "%s() unsupported cmd=%d\n", __func__, cmd); + ret = -EINVAL; + } + + return ret; +} + +/* + * So far only resolution of one period is supported, subject to extending the + * dmangine API + */ +static snd_pcm_uframes_t siu_pcm_pointer_dma(struct snd_pcm_substream *ss) +{ + struct device *dev = ss->pcm->card->dev; + struct siu_info *info = siu_i2s_dai.private_data; + u32 __iomem *base = info->reg; + struct siu_port *port_info = siu_port_info(ss); + struct snd_pcm_runtime *rt = ss->runtime; + size_t ptr; + struct siu_stream *siu_stream; + + if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) + siu_stream = &port_info->playback; + else + siu_stream = &port_info->capture; + + /* + * ptr is the offset into the buffer where the dma is currently at. We + * check if the dma buffer has just wrapped. + */ + ptr = PERIOD_OFFSET(rt->dma_addr, + siu_stream->cur_period, + siu_stream->period_bytes) - rt->dma_addr; + + dev_dbg(dev, + "%s: port=%d, events %x, FSTS %x, xferred %u/%u, cookie %d\n", + __func__, info->port_id, siu_read32(base + SIU_EVNTC), + siu_read32(base + SIU_SBFSTS), ptr, siu_stream->buf_bytes, + siu_stream->cookie); + + if (ptr >= siu_stream->buf_bytes) + ptr = 0; + + return bytes_to_frames(ss->runtime, ptr); +} + +static int siu_pcm_new(struct snd_card *card, struct snd_soc_dai *dai, + struct snd_pcm *pcm) +{ + /* card->dev == socdev->dev, see snd_soc_new_pcms() */ + struct siu_info *info = siu_i2s_dai.private_data; + struct platform_device *pdev = to_platform_device(card->dev); + int ret; + int i; + + /* pdev->id selects between SIUA and SIUB */ + if (pdev->id < 0 || pdev->id >= SIU_PORT_NUM) + return -EINVAL; + + info->port_id = pdev->id; + + /* + * While the siu has 2 ports, only one port can be on at a time (only 1 + * SPB). So far all the boards using the siu had only one of the ports + * wired to a codec. To simplify things, we only register one port with + * alsa. In case both ports are needed, it should be changed here + */ + for (i = pdev->id; i < pdev->id + 1; i++) { + struct siu_port **port_info = &siu_ports[i]; + + ret = siu_init_port(i, port_info, card); + if (ret < 0) + return ret; + + ret = snd_pcm_lib_preallocate_pages_for_all(pcm, + SNDRV_DMA_TYPE_DEV, NULL, + SIU_BUFFER_BYTES_MAX, SIU_BUFFER_BYTES_MAX); + if (ret < 0) { + dev_err(card->dev, + "snd_pcm_lib_preallocate_pages_for_all() err=%d", + ret); + goto fail; + } + + (*port_info)->pcm = pcm; + + /* IO tasklets */ + tasklet_init(&(*port_info)->playback.tasklet, siu_io_tasklet, + (unsigned long)&(*port_info)->playback); + tasklet_init(&(*port_info)->capture.tasklet, siu_io_tasklet, + (unsigned long)&(*port_info)->capture); + } + + dev_info(card->dev, "SuperH SIU driver initialized.\n"); + return 0; + +fail: + siu_free_port(siu_ports[pdev->id]); + dev_err(card->dev, "SIU: failed to initialize.\n"); + return ret; +} + +static void siu_pcm_free(struct snd_pcm *pcm) +{ + struct platform_device *pdev = to_platform_device(pcm->card->dev); + struct siu_port *port_info = siu_ports[pdev->id]; + + tasklet_kill(&port_info->capture.tasklet); + tasklet_kill(&port_info->playback.tasklet); + + siu_free_port(port_info); + snd_pcm_lib_preallocate_free_for_all(pcm); + + dev_dbg(pcm->card->dev, "%s\n", __func__); +} + +static struct snd_pcm_ops siu_pcm_ops = { + .open = siu_pcm_open, + .close = siu_pcm_close, + .ioctl = snd_pcm_lib_ioctl, + .hw_params = siu_pcm_hw_params, + .hw_free = siu_pcm_hw_free, + .prepare = siu_pcm_prepare, + .trigger = siu_pcm_trigger, + .pointer = siu_pcm_pointer_dma, +}; + +struct snd_soc_platform siu_platform = { + .name = "siu-audio", + .pcm_ops = &siu_pcm_ops, + .pcm_new = siu_pcm_new, + .pcm_free = siu_pcm_free, +}; +EXPORT_SYMBOL_GPL(siu_platform); |