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335 lines
9.3 KiB
335 lines
9.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// |
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// SH7760 ("camelot") DMABRG audio DMA unit support |
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// |
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// Copyright (C) 2007 Manuel Lauss <[email protected]> |
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// |
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// The SH7760 DMABRG provides 4 dma channels (2x rec, 2x play), which |
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// trigger an interrupt when one half of the programmed transfer size |
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// has been xmitted. |
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// |
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// FIXME: little-endian only for now |
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#include <linux/module.h> |
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#include <linux/gfp.h> |
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#include <linux/init.h> |
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#include <linux/platform_device.h> |
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#include <linux/dma-mapping.h> |
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#include <sound/core.h> |
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#include <sound/pcm.h> |
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#include <sound/pcm_params.h> |
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#include <sound/soc.h> |
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#include <asm/dmabrg.h> |
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/* registers and bits */ |
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#define BRGATXSAR 0x00 |
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#define BRGARXDAR 0x04 |
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#define BRGATXTCR 0x08 |
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#define BRGARXTCR 0x0C |
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#define BRGACR 0x10 |
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#define BRGATXTCNT 0x14 |
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#define BRGARXTCNT 0x18 |
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#define ACR_RAR (1 << 18) |
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#define ACR_RDS (1 << 17) |
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#define ACR_RDE (1 << 16) |
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#define ACR_TAR (1 << 2) |
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#define ACR_TDS (1 << 1) |
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#define ACR_TDE (1 << 0) |
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/* receiver/transmitter data alignment */ |
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#define ACR_RAM_NONE (0 << 24) |
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#define ACR_RAM_4BYTE (1 << 24) |
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#define ACR_RAM_2WORD (2 << 24) |
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#define ACR_TAM_NONE (0 << 8) |
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#define ACR_TAM_4BYTE (1 << 8) |
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#define ACR_TAM_2WORD (2 << 8) |
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struct camelot_pcm { |
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unsigned long mmio; /* DMABRG audio channel control reg MMIO */ |
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unsigned int txid; /* ID of first DMABRG IRQ for this unit */ |
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struct snd_pcm_substream *tx_ss; |
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unsigned long tx_period_size; |
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unsigned int tx_period; |
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struct snd_pcm_substream *rx_ss; |
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unsigned long rx_period_size; |
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unsigned int rx_period; |
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} cam_pcm_data[2] = { |
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{ |
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.mmio = 0xFE3C0040, |
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.txid = DMABRGIRQ_A0TXF, |
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}, |
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{ |
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.mmio = 0xFE3C0060, |
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.txid = DMABRGIRQ_A1TXF, |
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}, |
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}; |
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#define BRGREG(x) (*(unsigned long *)(cam->mmio + (x))) |
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/* |
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* set a minimum of 16kb per period, to avoid interrupt-"storm" and |
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* resulting skipping. In general, the bigger the minimum size, the |
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* better for overall system performance. (The SH7760 is a puny CPU |
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* with a slow SDRAM interface and poor internal bus bandwidth, |
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* *especially* when the LCDC is active). The minimum for the DMAC |
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* is 8 bytes; 16kbytes are enough to get skip-free playback of a |
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* 44kHz/16bit/stereo MP3 on a lightly loaded system, and maintain |
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* reasonable responsiveness in MPlayer. |
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*/ |
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#define DMABRG_PERIOD_MIN 16 * 1024 |
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#define DMABRG_PERIOD_MAX 0x03fffffc |
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#define DMABRG_PREALLOC_BUFFER 32 * 1024 |
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#define DMABRG_PREALLOC_BUFFER_MAX 32 * 1024 |
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static const struct snd_pcm_hardware camelot_pcm_hardware = { |
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.info = (SNDRV_PCM_INFO_MMAP | |
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SNDRV_PCM_INFO_INTERLEAVED | |
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SNDRV_PCM_INFO_BLOCK_TRANSFER | |
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SNDRV_PCM_INFO_MMAP_VALID | |
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SNDRV_PCM_INFO_BATCH), |
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.buffer_bytes_max = DMABRG_PERIOD_MAX, |
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.period_bytes_min = DMABRG_PERIOD_MIN, |
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.period_bytes_max = DMABRG_PERIOD_MAX / 2, |
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.periods_min = 2, |
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.periods_max = 2, |
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.fifo_size = 128, |
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}; |
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static void camelot_txdma(void *data) |
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{ |
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struct camelot_pcm *cam = data; |
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cam->tx_period ^= 1; |
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snd_pcm_period_elapsed(cam->tx_ss); |
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} |
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static void camelot_rxdma(void *data) |
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{ |
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struct camelot_pcm *cam = data; |
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cam->rx_period ^= 1; |
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snd_pcm_period_elapsed(cam->rx_ss); |
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} |
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static int camelot_pcm_open(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream) |
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{ |
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); |
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struct camelot_pcm *cam = &cam_pcm_data[asoc_rtd_to_cpu(rtd, 0)->id]; |
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int recv = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0:1; |
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int ret, dmairq; |
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snd_soc_set_runtime_hwparams(substream, &camelot_pcm_hardware); |
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/* DMABRG buffer half/full events */ |
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dmairq = (recv) ? cam->txid + 2 : cam->txid; |
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if (recv) { |
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cam->rx_ss = substream; |
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ret = dmabrg_request_irq(dmairq, camelot_rxdma, cam); |
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if (unlikely(ret)) { |
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pr_debug("audio unit %d irqs already taken!\n", |
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asoc_rtd_to_cpu(rtd, 0)->id); |
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return -EBUSY; |
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} |
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(void)dmabrg_request_irq(dmairq + 1,camelot_rxdma, cam); |
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} else { |
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cam->tx_ss = substream; |
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ret = dmabrg_request_irq(dmairq, camelot_txdma, cam); |
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if (unlikely(ret)) { |
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pr_debug("audio unit %d irqs already taken!\n", |
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asoc_rtd_to_cpu(rtd, 0)->id); |
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return -EBUSY; |
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} |
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(void)dmabrg_request_irq(dmairq + 1, camelot_txdma, cam); |
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} |
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return 0; |
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} |
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static int camelot_pcm_close(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream) |
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{ |
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); |
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struct camelot_pcm *cam = &cam_pcm_data[asoc_rtd_to_cpu(rtd, 0)->id]; |
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int recv = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0:1; |
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int dmairq; |
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dmairq = (recv) ? cam->txid + 2 : cam->txid; |
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if (recv) |
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cam->rx_ss = NULL; |
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else |
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cam->tx_ss = NULL; |
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dmabrg_free_irq(dmairq + 1); |
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dmabrg_free_irq(dmairq); |
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return 0; |
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} |
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static int camelot_hw_params(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream, |
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struct snd_pcm_hw_params *hw_params) |
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{ |
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); |
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struct camelot_pcm *cam = &cam_pcm_data[asoc_rtd_to_cpu(rtd, 0)->id]; |
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int recv = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0:1; |
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int ret; |
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if (recv) { |
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cam->rx_period_size = params_period_bytes(hw_params); |
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cam->rx_period = 0; |
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} else { |
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cam->tx_period_size = params_period_bytes(hw_params); |
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cam->tx_period = 0; |
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} |
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return 0; |
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} |
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static int camelot_prepare(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream) |
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{ |
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struct snd_pcm_runtime *runtime = substream->runtime; |
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); |
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struct camelot_pcm *cam = &cam_pcm_data[asoc_rtd_to_cpu(rtd, 0)->id]; |
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pr_debug("PCM data: addr 0x%08lx len %d\n", |
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(u32)runtime->dma_addr, runtime->dma_bytes); |
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |
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BRGREG(BRGATXSAR) = (unsigned long)runtime->dma_area; |
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BRGREG(BRGATXTCR) = runtime->dma_bytes; |
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} else { |
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BRGREG(BRGARXDAR) = (unsigned long)runtime->dma_area; |
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BRGREG(BRGARXTCR) = runtime->dma_bytes; |
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} |
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return 0; |
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} |
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static inline void dmabrg_play_dma_start(struct camelot_pcm *cam) |
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{ |
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unsigned long acr = BRGREG(BRGACR) & ~(ACR_TDS | ACR_RDS); |
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/* start DMABRG engine: XFER start, auto-addr-reload */ |
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BRGREG(BRGACR) = acr | ACR_TDE | ACR_TAR | ACR_TAM_2WORD; |
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} |
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static inline void dmabrg_play_dma_stop(struct camelot_pcm *cam) |
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{ |
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unsigned long acr = BRGREG(BRGACR) & ~(ACR_TDS | ACR_RDS); |
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/* forcibly terminate data transmission */ |
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BRGREG(BRGACR) = acr | ACR_TDS; |
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} |
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static inline void dmabrg_rec_dma_start(struct camelot_pcm *cam) |
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{ |
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unsigned long acr = BRGREG(BRGACR) & ~(ACR_TDS | ACR_RDS); |
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/* start DMABRG engine: recv start, auto-reload */ |
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BRGREG(BRGACR) = acr | ACR_RDE | ACR_RAR | ACR_RAM_2WORD; |
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} |
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static inline void dmabrg_rec_dma_stop(struct camelot_pcm *cam) |
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{ |
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unsigned long acr = BRGREG(BRGACR) & ~(ACR_TDS | ACR_RDS); |
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/* forcibly terminate data receiver */ |
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BRGREG(BRGACR) = acr | ACR_RDS; |
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} |
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static int camelot_trigger(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream, int cmd) |
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{ |
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); |
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struct camelot_pcm *cam = &cam_pcm_data[asoc_rtd_to_cpu(rtd, 0)->id]; |
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int recv = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0:1; |
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switch (cmd) { |
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case SNDRV_PCM_TRIGGER_START: |
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if (recv) |
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dmabrg_rec_dma_start(cam); |
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else |
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dmabrg_play_dma_start(cam); |
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break; |
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case SNDRV_PCM_TRIGGER_STOP: |
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if (recv) |
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dmabrg_rec_dma_stop(cam); |
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else |
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dmabrg_play_dma_stop(cam); |
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break; |
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default: |
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return -EINVAL; |
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} |
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return 0; |
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} |
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static snd_pcm_uframes_t camelot_pos(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream) |
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{ |
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struct snd_pcm_runtime *runtime = substream->runtime; |
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); |
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struct camelot_pcm *cam = &cam_pcm_data[asoc_rtd_to_cpu(rtd, 0)->id]; |
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int recv = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0:1; |
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unsigned long pos; |
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/* cannot use the DMABRG pointer register: under load, by the |
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* time ALSA comes around to read the register, it is already |
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* far ahead (or worse, already done with the fragment) of the |
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* position at the time the IRQ was triggered, which results in |
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* fast-playback sound in my test application (ScummVM) |
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*/ |
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if (recv) |
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pos = cam->rx_period ? cam->rx_period_size : 0; |
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else |
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pos = cam->tx_period ? cam->tx_period_size : 0; |
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return bytes_to_frames(runtime, pos); |
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} |
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static int camelot_pcm_new(struct snd_soc_component *component, |
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struct snd_soc_pcm_runtime *rtd) |
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{ |
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struct snd_pcm *pcm = rtd->pcm; |
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/* dont use SNDRV_DMA_TYPE_DEV, since it will oops the SH kernel |
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* in MMAP mode (i.e. aplay -M) |
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*/ |
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snd_pcm_set_managed_buffer_all(pcm, |
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SNDRV_DMA_TYPE_CONTINUOUS, |
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NULL, |
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DMABRG_PREALLOC_BUFFER, DMABRG_PREALLOC_BUFFER_MAX); |
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return 0; |
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} |
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static const struct snd_soc_component_driver sh7760_soc_component = { |
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.open = camelot_pcm_open, |
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.close = camelot_pcm_close, |
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.hw_params = camelot_hw_params, |
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.prepare = camelot_prepare, |
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.trigger = camelot_trigger, |
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.pointer = camelot_pos, |
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.pcm_construct = camelot_pcm_new, |
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}; |
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static int sh7760_soc_platform_probe(struct platform_device *pdev) |
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{ |
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return devm_snd_soc_register_component(&pdev->dev, &sh7760_soc_component, |
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NULL, 0); |
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} |
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static struct platform_driver sh7760_pcm_driver = { |
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.driver = { |
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.name = "sh7760-pcm-audio", |
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}, |
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.probe = sh7760_soc_platform_probe, |
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}; |
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module_platform_driver(sh7760_pcm_driver); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_DESCRIPTION("SH7760 Audio DMA (DMABRG) driver"); |
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MODULE_AUTHOR("Manuel Lauss <[email protected]>");
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