915 lines
26 KiB
C
915 lines
26 KiB
C
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/*
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* AMD ALSA SoC PCM Driver for ACP 2.x
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*
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* Copyright 2014-2015 Advanced Micro Devices, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/sizes.h>
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#include <sound/soc.h>
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#include "acp.h"
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#define PLAYBACK_MIN_NUM_PERIODS 2
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#define PLAYBACK_MAX_NUM_PERIODS 2
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#define PLAYBACK_MAX_PERIOD_SIZE 16384
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#define PLAYBACK_MIN_PERIOD_SIZE 1024
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#define CAPTURE_MIN_NUM_PERIODS 2
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#define CAPTURE_MAX_NUM_PERIODS 2
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#define CAPTURE_MAX_PERIOD_SIZE 16384
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#define CAPTURE_MIN_PERIOD_SIZE 1024
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#define MAX_BUFFER (PLAYBACK_MAX_PERIOD_SIZE * PLAYBACK_MAX_NUM_PERIODS)
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#define MIN_BUFFER MAX_BUFFER
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static const struct snd_pcm_hardware acp_pcm_hardware_playback = {
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.info = SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_BATCH |
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SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME,
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.formats = SNDRV_PCM_FMTBIT_S16_LE |
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SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE,
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.channels_min = 1,
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.channels_max = 8,
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.rates = SNDRV_PCM_RATE_8000_96000,
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.rate_min = 8000,
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.rate_max = 96000,
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.buffer_bytes_max = PLAYBACK_MAX_NUM_PERIODS * PLAYBACK_MAX_PERIOD_SIZE,
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.period_bytes_min = PLAYBACK_MIN_PERIOD_SIZE,
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.period_bytes_max = PLAYBACK_MAX_PERIOD_SIZE,
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.periods_min = PLAYBACK_MIN_NUM_PERIODS,
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.periods_max = PLAYBACK_MAX_NUM_PERIODS,
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};
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static const struct snd_pcm_hardware acp_pcm_hardware_capture = {
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.info = SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_BATCH |
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SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME,
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.formats = SNDRV_PCM_FMTBIT_S16_LE |
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SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE,
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.channels_min = 1,
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.channels_max = 2,
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.rates = SNDRV_PCM_RATE_8000_48000,
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.rate_min = 8000,
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.rate_max = 48000,
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.buffer_bytes_max = CAPTURE_MAX_NUM_PERIODS * CAPTURE_MAX_PERIOD_SIZE,
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.period_bytes_min = CAPTURE_MIN_PERIOD_SIZE,
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.period_bytes_max = CAPTURE_MAX_PERIOD_SIZE,
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.periods_min = CAPTURE_MIN_NUM_PERIODS,
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.periods_max = CAPTURE_MAX_NUM_PERIODS,
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};
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struct audio_drv_data {
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struct snd_pcm_substream *play_stream;
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struct snd_pcm_substream *capture_stream;
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void __iomem *acp_mmio;
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};
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static u32 acp_reg_read(void __iomem *acp_mmio, u32 reg)
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{
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return readl(acp_mmio + (reg * 4));
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}
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static void acp_reg_write(u32 val, void __iomem *acp_mmio, u32 reg)
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{
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writel(val, acp_mmio + (reg * 4));
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}
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/* Configure a given dma channel parameters - enable/disble,
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* number of descriptors, priority
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*/
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static void config_acp_dma_channel(void __iomem *acp_mmio, u8 ch_num,
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u16 dscr_strt_idx, u16 num_dscrs,
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enum acp_dma_priority_level priority_level)
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{
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u32 dma_ctrl;
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/* disable the channel run field */
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dma_ctrl = acp_reg_read(acp_mmio, mmACP_DMA_CNTL_0 + ch_num);
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dma_ctrl &= ~ACP_DMA_CNTL_0__DMAChRun_MASK;
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acp_reg_write(dma_ctrl, acp_mmio, mmACP_DMA_CNTL_0 + ch_num);
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/* program a DMA channel with first descriptor to be processed. */
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acp_reg_write((ACP_DMA_DSCR_STRT_IDX_0__DMAChDscrStrtIdx_MASK
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& dscr_strt_idx),
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acp_mmio, mmACP_DMA_DSCR_STRT_IDX_0 + ch_num);
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/* program a DMA channel with the number of descriptors to be
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* processed in the transfer
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*/
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acp_reg_write(ACP_DMA_DSCR_CNT_0__DMAChDscrCnt_MASK & num_dscrs,
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acp_mmio, mmACP_DMA_DSCR_CNT_0 + ch_num);
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/* set DMA channel priority */
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acp_reg_write(priority_level, acp_mmio, mmACP_DMA_PRIO_0 + ch_num);
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}
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/* Initialize a dma descriptor in SRAM based on descritor information passed */
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static void config_dma_descriptor_in_sram(void __iomem *acp_mmio,
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u16 descr_idx,
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acp_dma_dscr_transfer_t *descr_info)
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{
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u32 sram_offset;
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sram_offset = (descr_idx * sizeof(acp_dma_dscr_transfer_t));
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/* program the source base address. */
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acp_reg_write(sram_offset, acp_mmio, mmACP_SRBM_Targ_Idx_Addr);
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acp_reg_write(descr_info->src, acp_mmio, mmACP_SRBM_Targ_Idx_Data);
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/* program the destination base address. */
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acp_reg_write(sram_offset + 4, acp_mmio, mmACP_SRBM_Targ_Idx_Addr);
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acp_reg_write(descr_info->dest, acp_mmio, mmACP_SRBM_Targ_Idx_Data);
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/* program the number of bytes to be transferred for this descriptor. */
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acp_reg_write(sram_offset + 8, acp_mmio, mmACP_SRBM_Targ_Idx_Addr);
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acp_reg_write(descr_info->xfer_val, acp_mmio, mmACP_SRBM_Targ_Idx_Data);
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}
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/* Initialize the DMA descriptor information for transfer between
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* system memory <-> ACP SRAM
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*/
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static void set_acp_sysmem_dma_descriptors(void __iomem *acp_mmio,
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u32 size, int direction,
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u32 pte_offset)
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{
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u16 i;
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u16 dma_dscr_idx = PLAYBACK_START_DMA_DESCR_CH12;
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acp_dma_dscr_transfer_t dmadscr[NUM_DSCRS_PER_CHANNEL];
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for (i = 0; i < NUM_DSCRS_PER_CHANNEL; i++) {
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dmadscr[i].xfer_val = 0;
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if (direction == SNDRV_PCM_STREAM_PLAYBACK) {
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dma_dscr_idx = PLAYBACK_START_DMA_DESCR_CH12 + i;
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dmadscr[i].dest = ACP_SHARED_RAM_BANK_1_ADDRESS +
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(size / 2) - (i * (size/2));
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dmadscr[i].src = ACP_INTERNAL_APERTURE_WINDOW_0_ADDRESS
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+ (pte_offset * SZ_4K) + (i * (size/2));
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dmadscr[i].xfer_val |=
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(ACP_DMA_ATTRIBUTES_DAGB_ONION_TO_SHAREDMEM << 16) |
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(size / 2);
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} else {
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dma_dscr_idx = CAPTURE_START_DMA_DESCR_CH14 + i;
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dmadscr[i].src = ACP_SHARED_RAM_BANK_5_ADDRESS +
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(i * (size/2));
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dmadscr[i].dest = ACP_INTERNAL_APERTURE_WINDOW_0_ADDRESS
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+ (pte_offset * SZ_4K) +
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(i * (size/2));
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dmadscr[i].xfer_val |=
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BIT(22) |
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(ACP_DMA_ATTRIBUTES_SHAREDMEM_TO_DAGB_ONION << 16) |
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(size / 2);
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}
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config_dma_descriptor_in_sram(acp_mmio, dma_dscr_idx,
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&dmadscr[i]);
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}
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if (direction == SNDRV_PCM_STREAM_PLAYBACK)
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config_acp_dma_channel(acp_mmio, SYSRAM_TO_ACP_CH_NUM,
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PLAYBACK_START_DMA_DESCR_CH12,
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NUM_DSCRS_PER_CHANNEL,
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ACP_DMA_PRIORITY_LEVEL_NORMAL);
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else
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config_acp_dma_channel(acp_mmio, ACP_TO_SYSRAM_CH_NUM,
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CAPTURE_START_DMA_DESCR_CH14,
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NUM_DSCRS_PER_CHANNEL,
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ACP_DMA_PRIORITY_LEVEL_NORMAL);
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}
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/* Initialize the DMA descriptor information for transfer between
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* ACP SRAM <-> I2S
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*/
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static void set_acp_to_i2s_dma_descriptors(void __iomem *acp_mmio,
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u32 size, int direction)
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{
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u16 i;
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u16 dma_dscr_idx = PLAYBACK_START_DMA_DESCR_CH13;
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acp_dma_dscr_transfer_t dmadscr[NUM_DSCRS_PER_CHANNEL];
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for (i = 0; i < NUM_DSCRS_PER_CHANNEL; i++) {
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dmadscr[i].xfer_val = 0;
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if (direction == SNDRV_PCM_STREAM_PLAYBACK) {
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dma_dscr_idx = PLAYBACK_START_DMA_DESCR_CH13 + i;
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dmadscr[i].src = ACP_SHARED_RAM_BANK_1_ADDRESS +
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(i * (size/2));
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/* dmadscr[i].dest is unused by hardware. */
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dmadscr[i].dest = 0;
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dmadscr[i].xfer_val |= BIT(22) | (TO_ACP_I2S_1 << 16) |
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(size / 2);
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} else {
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dma_dscr_idx = CAPTURE_START_DMA_DESCR_CH15 + i;
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/* dmadscr[i].src is unused by hardware. */
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dmadscr[i].src = 0;
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dmadscr[i].dest = ACP_SHARED_RAM_BANK_5_ADDRESS +
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(i * (size / 2));
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dmadscr[i].xfer_val |= BIT(22) |
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(FROM_ACP_I2S_1 << 16) | (size / 2);
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}
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config_dma_descriptor_in_sram(acp_mmio, dma_dscr_idx,
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&dmadscr[i]);
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}
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/* Configure the DMA channel with the above descriptore */
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if (direction == SNDRV_PCM_STREAM_PLAYBACK)
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config_acp_dma_channel(acp_mmio, ACP_TO_I2S_DMA_CH_NUM,
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PLAYBACK_START_DMA_DESCR_CH13,
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NUM_DSCRS_PER_CHANNEL,
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ACP_DMA_PRIORITY_LEVEL_NORMAL);
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else
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config_acp_dma_channel(acp_mmio, I2S_TO_ACP_DMA_CH_NUM,
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CAPTURE_START_DMA_DESCR_CH15,
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NUM_DSCRS_PER_CHANNEL,
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ACP_DMA_PRIORITY_LEVEL_NORMAL);
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}
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/* Create page table entries in ACP SRAM for the allocated memory */
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static void acp_pte_config(void __iomem *acp_mmio, struct page *pg,
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u16 num_of_pages, u32 pte_offset)
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{
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u16 page_idx;
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u64 addr;
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u32 low;
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u32 high;
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u32 offset;
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offset = ACP_DAGB_GRP_SRBM_SRAM_BASE_OFFSET + (pte_offset * 8);
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for (page_idx = 0; page_idx < (num_of_pages); page_idx++) {
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/* Load the low address of page int ACP SRAM through SRBM */
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acp_reg_write((offset + (page_idx * 8)),
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acp_mmio, mmACP_SRBM_Targ_Idx_Addr);
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addr = page_to_phys(pg);
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low = lower_32_bits(addr);
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high = upper_32_bits(addr);
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acp_reg_write(low, acp_mmio, mmACP_SRBM_Targ_Idx_Data);
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/* Load the High address of page int ACP SRAM through SRBM */
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acp_reg_write((offset + (page_idx * 8) + 4),
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acp_mmio, mmACP_SRBM_Targ_Idx_Addr);
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/* page enable in ACP */
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high |= BIT(31);
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acp_reg_write(high, acp_mmio, mmACP_SRBM_Targ_Idx_Data);
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/* Move to next physically contiguos page */
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pg++;
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}
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}
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static void config_acp_dma(void __iomem *acp_mmio,
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struct audio_substream_data *audio_config)
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{
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u32 pte_offset;
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if (audio_config->direction == SNDRV_PCM_STREAM_PLAYBACK)
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pte_offset = ACP_PLAYBACK_PTE_OFFSET;
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else
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pte_offset = ACP_CAPTURE_PTE_OFFSET;
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acp_pte_config(acp_mmio, audio_config->pg, audio_config->num_of_pages,
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pte_offset);
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/* Configure System memory <-> ACP SRAM DMA descriptors */
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set_acp_sysmem_dma_descriptors(acp_mmio, audio_config->size,
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audio_config->direction, pte_offset);
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/* Configure ACP SRAM <-> I2S DMA descriptors */
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set_acp_to_i2s_dma_descriptors(acp_mmio, audio_config->size,
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audio_config->direction);
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}
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/* Start a given DMA channel transfer */
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static void acp_dma_start(void __iomem *acp_mmio,
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u16 ch_num, bool is_circular)
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{
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u32 dma_ctrl;
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/* read the dma control register and disable the channel run field */
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dma_ctrl = acp_reg_read(acp_mmio, mmACP_DMA_CNTL_0 + ch_num);
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/* Invalidating the DAGB cache */
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acp_reg_write(1, acp_mmio, mmACP_DAGB_ATU_CTRL);
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/* configure the DMA channel and start the DMA transfer
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* set dmachrun bit to start the transfer and enable the
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* interrupt on completion of the dma transfer
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*/
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dma_ctrl |= ACP_DMA_CNTL_0__DMAChRun_MASK;
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switch (ch_num) {
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case ACP_TO_I2S_DMA_CH_NUM:
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case ACP_TO_SYSRAM_CH_NUM:
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case I2S_TO_ACP_DMA_CH_NUM:
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dma_ctrl |= ACP_DMA_CNTL_0__DMAChIOCEn_MASK;
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break;
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default:
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dma_ctrl &= ~ACP_DMA_CNTL_0__DMAChIOCEn_MASK;
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break;
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}
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/* enable for ACP SRAM to/from I2S DMA channel */
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if (is_circular == true)
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dma_ctrl |= ACP_DMA_CNTL_0__Circular_DMA_En_MASK;
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else
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dma_ctrl &= ~ACP_DMA_CNTL_0__Circular_DMA_En_MASK;
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acp_reg_write(dma_ctrl, acp_mmio, mmACP_DMA_CNTL_0 + ch_num);
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}
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/* Stop a given DMA channel transfer */
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static int acp_dma_stop(void __iomem *acp_mmio, u8 ch_num)
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{
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u32 dma_ctrl;
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u32 dma_ch_sts;
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u32 count = ACP_DMA_RESET_TIME;
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dma_ctrl = acp_reg_read(acp_mmio, mmACP_DMA_CNTL_0 + ch_num);
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/* clear the dma control register fields before writing zero
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* in reset bit
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*/
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dma_ctrl &= ~ACP_DMA_CNTL_0__DMAChRun_MASK;
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dma_ctrl &= ~ACP_DMA_CNTL_0__DMAChIOCEn_MASK;
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acp_reg_write(dma_ctrl, acp_mmio, mmACP_DMA_CNTL_0 + ch_num);
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dma_ch_sts = acp_reg_read(acp_mmio, mmACP_DMA_CH_STS);
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if (dma_ch_sts & BIT(ch_num)) {
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/* set the reset bit for this channel to stop the dma
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* transfer
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*/
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dma_ctrl |= ACP_DMA_CNTL_0__DMAChRst_MASK;
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acp_reg_write(dma_ctrl, acp_mmio, mmACP_DMA_CNTL_0 + ch_num);
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}
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/* check the channel status bit for some time and return the status */
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while (true) {
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dma_ch_sts = acp_reg_read(acp_mmio, mmACP_DMA_CH_STS);
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if (!(dma_ch_sts & BIT(ch_num))) {
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/* clear the reset flag after successfully stopping
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* the dma transfer and break from the loop
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*/
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||
|
dma_ctrl &= ~ACP_DMA_CNTL_0__DMAChRst_MASK;
|
||
|
|
||
|
acp_reg_write(dma_ctrl, acp_mmio, mmACP_DMA_CNTL_0
|
||
|
+ ch_num);
|
||
|
break;
|
||
|
}
|
||
|
if (--count == 0) {
|
||
|
pr_err("Failed to stop ACP DMA channel : %d\n", ch_num);
|
||
|
return -ETIMEDOUT;
|
||
|
}
|
||
|
udelay(100);
|
||
|
}
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/* Initialize and bring ACP hardware to default state. */
|
||
|
static int acp_init(void __iomem *acp_mmio)
|
||
|
{
|
||
|
u32 val, count, sram_pte_offset;
|
||
|
|
||
|
/* Assert Soft reset of ACP */
|
||
|
val = acp_reg_read(acp_mmio, mmACP_SOFT_RESET);
|
||
|
|
||
|
val |= ACP_SOFT_RESET__SoftResetAud_MASK;
|
||
|
acp_reg_write(val, acp_mmio, mmACP_SOFT_RESET);
|
||
|
|
||
|
count = ACP_SOFT_RESET_DONE_TIME_OUT_VALUE;
|
||
|
while (true) {
|
||
|
val = acp_reg_read(acp_mmio, mmACP_SOFT_RESET);
|
||
|
if (ACP_SOFT_RESET__SoftResetAudDone_MASK ==
|
||
|
(val & ACP_SOFT_RESET__SoftResetAudDone_MASK))
|
||
|
break;
|
||
|
if (--count == 0) {
|
||
|
pr_err("Failed to reset ACP\n");
|
||
|
return -ETIMEDOUT;
|
||
|
}
|
||
|
udelay(100);
|
||
|
}
|
||
|
|
||
|
/* Enable clock to ACP and wait until the clock is enabled */
|
||
|
val = acp_reg_read(acp_mmio, mmACP_CONTROL);
|
||
|
val = val | ACP_CONTROL__ClkEn_MASK;
|
||
|
acp_reg_write(val, acp_mmio, mmACP_CONTROL);
|
||
|
|
||
|
count = ACP_CLOCK_EN_TIME_OUT_VALUE;
|
||
|
|
||
|
while (true) {
|
||
|
val = acp_reg_read(acp_mmio, mmACP_STATUS);
|
||
|
if (val & (u32) 0x1)
|
||
|
break;
|
||
|
if (--count == 0) {
|
||
|
pr_err("Failed to reset ACP\n");
|
||
|
return -ETIMEDOUT;
|
||
|
}
|
||
|
udelay(100);
|
||
|
}
|
||
|
|
||
|
/* Deassert the SOFT RESET flags */
|
||
|
val = acp_reg_read(acp_mmio, mmACP_SOFT_RESET);
|
||
|
val &= ~ACP_SOFT_RESET__SoftResetAud_MASK;
|
||
|
acp_reg_write(val, acp_mmio, mmACP_SOFT_RESET);
|
||
|
|
||
|
/* initiailize Onion control DAGB register */
|
||
|
acp_reg_write(ACP_ONION_CNTL_DEFAULT, acp_mmio,
|
||
|
mmACP_AXI2DAGB_ONION_CNTL);
|
||
|
|
||
|
/* initiailize Garlic control DAGB registers */
|
||
|
acp_reg_write(ACP_GARLIC_CNTL_DEFAULT, acp_mmio,
|
||
|
mmACP_AXI2DAGB_GARLIC_CNTL);
|
||
|
|
||
|
sram_pte_offset = ACP_DAGB_GRP_SRAM_BASE_ADDRESS |
|
||
|
ACP_DAGB_BASE_ADDR_GRP_1__AXI2DAGBSnoopSel_MASK |
|
||
|
ACP_DAGB_BASE_ADDR_GRP_1__AXI2DAGBTargetMemSel_MASK |
|
||
|
ACP_DAGB_BASE_ADDR_GRP_1__AXI2DAGBGrpEnable_MASK;
|
||
|
acp_reg_write(sram_pte_offset, acp_mmio, mmACP_DAGB_BASE_ADDR_GRP_1);
|
||
|
acp_reg_write(ACP_PAGE_SIZE_4K_ENABLE, acp_mmio,
|
||
|
mmACP_DAGB_PAGE_SIZE_GRP_1);
|
||
|
|
||
|
acp_reg_write(ACP_SRAM_BASE_ADDRESS, acp_mmio,
|
||
|
mmACP_DMA_DESC_BASE_ADDR);
|
||
|
|
||
|
/* Num of descriptiors in SRAM 0x4, means 256 descriptors;(64 * 4) */
|
||
|
acp_reg_write(0x4, acp_mmio, mmACP_DMA_DESC_MAX_NUM_DSCR);
|
||
|
acp_reg_write(ACP_EXTERNAL_INTR_CNTL__DMAIOCMask_MASK,
|
||
|
acp_mmio, mmACP_EXTERNAL_INTR_CNTL);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/* Deintialize ACP */
|
||
|
static int acp_deinit(void __iomem *acp_mmio)
|
||
|
{
|
||
|
u32 val;
|
||
|
u32 count;
|
||
|
|
||
|
/* Assert Soft reset of ACP */
|
||
|
val = acp_reg_read(acp_mmio, mmACP_SOFT_RESET);
|
||
|
|
||
|
val |= ACP_SOFT_RESET__SoftResetAud_MASK;
|
||
|
acp_reg_write(val, acp_mmio, mmACP_SOFT_RESET);
|
||
|
|
||
|
count = ACP_SOFT_RESET_DONE_TIME_OUT_VALUE;
|
||
|
while (true) {
|
||
|
val = acp_reg_read(acp_mmio, mmACP_SOFT_RESET);
|
||
|
if (ACP_SOFT_RESET__SoftResetAudDone_MASK ==
|
||
|
(val & ACP_SOFT_RESET__SoftResetAudDone_MASK))
|
||
|
break;
|
||
|
if (--count == 0) {
|
||
|
pr_err("Failed to reset ACP\n");
|
||
|
return -ETIMEDOUT;
|
||
|
}
|
||
|
udelay(100);
|
||
|
}
|
||
|
/** Disable ACP clock */
|
||
|
val = acp_reg_read(acp_mmio, mmACP_CONTROL);
|
||
|
val &= ~ACP_CONTROL__ClkEn_MASK;
|
||
|
acp_reg_write(val, acp_mmio, mmACP_CONTROL);
|
||
|
|
||
|
count = ACP_CLOCK_EN_TIME_OUT_VALUE;
|
||
|
|
||
|
while (true) {
|
||
|
val = acp_reg_read(acp_mmio, mmACP_STATUS);
|
||
|
if (!(val & (u32) 0x1))
|
||
|
break;
|
||
|
if (--count == 0) {
|
||
|
pr_err("Failed to reset ACP\n");
|
||
|
return -ETIMEDOUT;
|
||
|
}
|
||
|
udelay(100);
|
||
|
}
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/* ACP DMA irq handler routine for playback, capture usecases */
|
||
|
static irqreturn_t dma_irq_handler(int irq, void *arg)
|
||
|
{
|
||
|
u16 dscr_idx;
|
||
|
u32 intr_flag, ext_intr_status;
|
||
|
struct audio_drv_data *irq_data;
|
||
|
void __iomem *acp_mmio;
|
||
|
struct device *dev = arg;
|
||
|
bool valid_irq = false;
|
||
|
|
||
|
irq_data = dev_get_drvdata(dev);
|
||
|
acp_mmio = irq_data->acp_mmio;
|
||
|
|
||
|
ext_intr_status = acp_reg_read(acp_mmio, mmACP_EXTERNAL_INTR_STAT);
|
||
|
intr_flag = (((ext_intr_status &
|
||
|
ACP_EXTERNAL_INTR_STAT__DMAIOCStat_MASK) >>
|
||
|
ACP_EXTERNAL_INTR_STAT__DMAIOCStat__SHIFT));
|
||
|
|
||
|
if ((intr_flag & BIT(ACP_TO_I2S_DMA_CH_NUM)) != 0) {
|
||
|
valid_irq = true;
|
||
|
if (acp_reg_read(acp_mmio, mmACP_DMA_CUR_DSCR_13) ==
|
||
|
PLAYBACK_START_DMA_DESCR_CH13)
|
||
|
dscr_idx = PLAYBACK_START_DMA_DESCR_CH12;
|
||
|
else
|
||
|
dscr_idx = PLAYBACK_END_DMA_DESCR_CH12;
|
||
|
config_acp_dma_channel(acp_mmio, SYSRAM_TO_ACP_CH_NUM, dscr_idx,
|
||
|
1, 0);
|
||
|
acp_dma_start(acp_mmio, SYSRAM_TO_ACP_CH_NUM, false);
|
||
|
|
||
|
snd_pcm_period_elapsed(irq_data->play_stream);
|
||
|
|
||
|
acp_reg_write((intr_flag & BIT(ACP_TO_I2S_DMA_CH_NUM)) << 16,
|
||
|
acp_mmio, mmACP_EXTERNAL_INTR_STAT);
|
||
|
}
|
||
|
|
||
|
if ((intr_flag & BIT(I2S_TO_ACP_DMA_CH_NUM)) != 0) {
|
||
|
valid_irq = true;
|
||
|
if (acp_reg_read(acp_mmio, mmACP_DMA_CUR_DSCR_15) ==
|
||
|
CAPTURE_START_DMA_DESCR_CH15)
|
||
|
dscr_idx = CAPTURE_END_DMA_DESCR_CH14;
|
||
|
else
|
||
|
dscr_idx = CAPTURE_START_DMA_DESCR_CH14;
|
||
|
config_acp_dma_channel(acp_mmio, ACP_TO_SYSRAM_CH_NUM, dscr_idx,
|
||
|
1, 0);
|
||
|
acp_dma_start(acp_mmio, ACP_TO_SYSRAM_CH_NUM, false);
|
||
|
|
||
|
acp_reg_write((intr_flag & BIT(I2S_TO_ACP_DMA_CH_NUM)) << 16,
|
||
|
acp_mmio, mmACP_EXTERNAL_INTR_STAT);
|
||
|
}
|
||
|
|
||
|
if ((intr_flag & BIT(ACP_TO_SYSRAM_CH_NUM)) != 0) {
|
||
|
valid_irq = true;
|
||
|
snd_pcm_period_elapsed(irq_data->capture_stream);
|
||
|
acp_reg_write((intr_flag & BIT(ACP_TO_SYSRAM_CH_NUM)) << 16,
|
||
|
acp_mmio, mmACP_EXTERNAL_INTR_STAT);
|
||
|
}
|
||
|
|
||
|
if (valid_irq)
|
||
|
return IRQ_HANDLED;
|
||
|
else
|
||
|
return IRQ_NONE;
|
||
|
}
|
||
|
|
||
|
static int acp_dma_open(struct snd_pcm_substream *substream)
|
||
|
{
|
||
|
int ret = 0;
|
||
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
||
|
struct snd_soc_pcm_runtime *prtd = substream->private_data;
|
||
|
struct audio_drv_data *intr_data = dev_get_drvdata(prtd->platform->dev);
|
||
|
|
||
|
struct audio_substream_data *adata =
|
||
|
kzalloc(sizeof(struct audio_substream_data), GFP_KERNEL);
|
||
|
if (adata == NULL)
|
||
|
return -ENOMEM;
|
||
|
|
||
|
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
|
||
|
runtime->hw = acp_pcm_hardware_playback;
|
||
|
else
|
||
|
runtime->hw = acp_pcm_hardware_capture;
|
||
|
|
||
|
ret = snd_pcm_hw_constraint_integer(runtime,
|
||
|
SNDRV_PCM_HW_PARAM_PERIODS);
|
||
|
if (ret < 0) {
|
||
|
dev_err(prtd->platform->dev, "set integer constraint failed\n");
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
adata->acp_mmio = intr_data->acp_mmio;
|
||
|
runtime->private_data = adata;
|
||
|
|
||
|
/* Enable ACP irq, when neither playback or capture streams are
|
||
|
* active by the time when a new stream is being opened.
|
||
|
* This enablement is not required for another stream, if current
|
||
|
* stream is not closed
|
||
|
*/
|
||
|
if (!intr_data->play_stream && !intr_data->capture_stream)
|
||
|
acp_reg_write(1, adata->acp_mmio, mmACP_EXTERNAL_INTR_ENB);
|
||
|
|
||
|
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
|
||
|
intr_data->play_stream = substream;
|
||
|
else
|
||
|
intr_data->capture_stream = substream;
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int acp_dma_hw_params(struct snd_pcm_substream *substream,
|
||
|
struct snd_pcm_hw_params *params)
|
||
|
{
|
||
|
int status;
|
||
|
uint64_t size;
|
||
|
struct snd_dma_buffer *dma_buffer;
|
||
|
struct page *pg;
|
||
|
struct snd_pcm_runtime *runtime;
|
||
|
struct audio_substream_data *rtd;
|
||
|
|
||
|
dma_buffer = &substream->dma_buffer;
|
||
|
|
||
|
runtime = substream->runtime;
|
||
|
rtd = runtime->private_data;
|
||
|
|
||
|
if (WARN_ON(!rtd))
|
||
|
return -EINVAL;
|
||
|
|
||
|
size = params_buffer_bytes(params);
|
||
|
status = snd_pcm_lib_malloc_pages(substream, size);
|
||
|
if (status < 0)
|
||
|
return status;
|
||
|
|
||
|
memset(substream->runtime->dma_area, 0, params_buffer_bytes(params));
|
||
|
pg = virt_to_page(substream->dma_buffer.area);
|
||
|
|
||
|
if (pg != NULL) {
|
||
|
/* Save for runtime private data */
|
||
|
rtd->pg = pg;
|
||
|
rtd->order = get_order(size);
|
||
|
|
||
|
/* Fill the page table entries in ACP SRAM */
|
||
|
rtd->pg = pg;
|
||
|
rtd->size = size;
|
||
|
rtd->num_of_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
|
||
|
rtd->direction = substream->stream;
|
||
|
|
||
|
config_acp_dma(rtd->acp_mmio, rtd);
|
||
|
status = 0;
|
||
|
} else {
|
||
|
status = -ENOMEM;
|
||
|
}
|
||
|
return status;
|
||
|
}
|
||
|
|
||
|
static int acp_dma_hw_free(struct snd_pcm_substream *substream)
|
||
|
{
|
||
|
return snd_pcm_lib_free_pages(substream);
|
||
|
}
|
||
|
|
||
|
static snd_pcm_uframes_t acp_dma_pointer(struct snd_pcm_substream *substream)
|
||
|
{
|
||
|
u16 dscr;
|
||
|
u32 mul, dma_config, period_bytes;
|
||
|
u32 pos = 0;
|
||
|
|
||
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
||
|
struct audio_substream_data *rtd = runtime->private_data;
|
||
|
|
||
|
period_bytes = frames_to_bytes(runtime, runtime->period_size);
|
||
|
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
|
||
|
dscr = acp_reg_read(rtd->acp_mmio, mmACP_DMA_CUR_DSCR_13);
|
||
|
|
||
|
if (dscr == PLAYBACK_START_DMA_DESCR_CH13)
|
||
|
mul = 0;
|
||
|
else
|
||
|
mul = 1;
|
||
|
pos = (mul * period_bytes);
|
||
|
} else {
|
||
|
dma_config = acp_reg_read(rtd->acp_mmio, mmACP_DMA_CNTL_14);
|
||
|
if (dma_config != 0) {
|
||
|
dscr = acp_reg_read(rtd->acp_mmio,
|
||
|
mmACP_DMA_CUR_DSCR_14);
|
||
|
if (dscr == CAPTURE_START_DMA_DESCR_CH14)
|
||
|
mul = 1;
|
||
|
else
|
||
|
mul = 2;
|
||
|
pos = (mul * period_bytes);
|
||
|
}
|
||
|
|
||
|
if (pos >= (2 * period_bytes))
|
||
|
pos = 0;
|
||
|
|
||
|
}
|
||
|
return bytes_to_frames(runtime, pos);
|
||
|
}
|
||
|
|
||
|
static int acp_dma_mmap(struct snd_pcm_substream *substream,
|
||
|
struct vm_area_struct *vma)
|
||
|
{
|
||
|
return snd_pcm_lib_default_mmap(substream, vma);
|
||
|
}
|
||
|
|
||
|
static int acp_dma_prepare(struct snd_pcm_substream *substream)
|
||
|
{
|
||
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
||
|
struct audio_substream_data *rtd = runtime->private_data;
|
||
|
|
||
|
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
|
||
|
config_acp_dma_channel(rtd->acp_mmio, SYSRAM_TO_ACP_CH_NUM,
|
||
|
PLAYBACK_START_DMA_DESCR_CH12,
|
||
|
NUM_DSCRS_PER_CHANNEL, 0);
|
||
|
config_acp_dma_channel(rtd->acp_mmio, ACP_TO_I2S_DMA_CH_NUM,
|
||
|
PLAYBACK_START_DMA_DESCR_CH13,
|
||
|
NUM_DSCRS_PER_CHANNEL, 0);
|
||
|
/* Fill ACP SRAM (2 periods) with zeros from System RAM
|
||
|
* which is zero-ed in hw_params
|
||
|
*/
|
||
|
acp_dma_start(rtd->acp_mmio, SYSRAM_TO_ACP_CH_NUM, false);
|
||
|
|
||
|
/* ACP SRAM (2 periods of buffer size) is intially filled with
|
||
|
* zeros. Before rendering starts, 2nd half of SRAM will be
|
||
|
* filled with valid audio data DMA'ed from first half of system
|
||
|
* RAM and 1st half of SRAM will be filled with Zeros. This is
|
||
|
* the initial scenario when redering starts from SRAM. Later
|
||
|
* on, 2nd half of system memory will be DMA'ed to 1st half of
|
||
|
* SRAM, 1st half of system memory will be DMA'ed to 2nd half of
|
||
|
* SRAM in ping-pong way till rendering stops.
|
||
|
*/
|
||
|
config_acp_dma_channel(rtd->acp_mmio, SYSRAM_TO_ACP_CH_NUM,
|
||
|
PLAYBACK_START_DMA_DESCR_CH12,
|
||
|
1, 0);
|
||
|
} else {
|
||
|
config_acp_dma_channel(rtd->acp_mmio, ACP_TO_SYSRAM_CH_NUM,
|
||
|
CAPTURE_START_DMA_DESCR_CH14,
|
||
|
NUM_DSCRS_PER_CHANNEL, 0);
|
||
|
config_acp_dma_channel(rtd->acp_mmio, I2S_TO_ACP_DMA_CH_NUM,
|
||
|
CAPTURE_START_DMA_DESCR_CH15,
|
||
|
NUM_DSCRS_PER_CHANNEL, 0);
|
||
|
}
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int acp_dma_trigger(struct snd_pcm_substream *substream, int cmd)
|
||
|
{
|
||
|
int ret;
|
||
|
u32 loops = 1000;
|
||
|
|
||
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
||
|
struct snd_soc_pcm_runtime *prtd = substream->private_data;
|
||
|
struct audio_substream_data *rtd = runtime->private_data;
|
||
|
|
||
|
if (!rtd)
|
||
|
return -EINVAL;
|
||
|
switch (cmd) {
|
||
|
case SNDRV_PCM_TRIGGER_START:
|
||
|
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
|
||
|
case SNDRV_PCM_TRIGGER_RESUME:
|
||
|
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
|
||
|
acp_dma_start(rtd->acp_mmio,
|
||
|
SYSRAM_TO_ACP_CH_NUM, false);
|
||
|
while (acp_reg_read(rtd->acp_mmio, mmACP_DMA_CH_STS) &
|
||
|
BIT(SYSRAM_TO_ACP_CH_NUM)) {
|
||
|
if (!loops--) {
|
||
|
dev_err(prtd->platform->dev,
|
||
|
"acp dma start timeout\n");
|
||
|
return -ETIMEDOUT;
|
||
|
}
|
||
|
cpu_relax();
|
||
|
}
|
||
|
|
||
|
acp_dma_start(rtd->acp_mmio,
|
||
|
ACP_TO_I2S_DMA_CH_NUM, true);
|
||
|
|
||
|
} else {
|
||
|
acp_dma_start(rtd->acp_mmio,
|
||
|
I2S_TO_ACP_DMA_CH_NUM, true);
|
||
|
}
|
||
|
ret = 0;
|
||
|
break;
|
||
|
case SNDRV_PCM_TRIGGER_STOP:
|
||
|
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
|
||
|
case SNDRV_PCM_TRIGGER_SUSPEND:
|
||
|
/* Need to stop only circular DMA channels :
|
||
|
* ACP_TO_I2S_DMA_CH_NUM / I2S_TO_ACP_DMA_CH_NUM. Non-circular
|
||
|
* channels will stopped automatically after its transfer
|
||
|
* completes : SYSRAM_TO_ACP_CH_NUM / ACP_TO_SYSRAM_CH_NUM
|
||
|
*/
|
||
|
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
|
||
|
ret = acp_dma_stop(rtd->acp_mmio,
|
||
|
ACP_TO_I2S_DMA_CH_NUM);
|
||
|
else
|
||
|
ret = acp_dma_stop(rtd->acp_mmio,
|
||
|
I2S_TO_ACP_DMA_CH_NUM);
|
||
|
break;
|
||
|
default:
|
||
|
ret = -EINVAL;
|
||
|
|
||
|
}
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static int acp_dma_new(struct snd_soc_pcm_runtime *rtd)
|
||
|
{
|
||
|
return snd_pcm_lib_preallocate_pages_for_all(rtd->pcm,
|
||
|
SNDRV_DMA_TYPE_DEV,
|
||
|
NULL, MIN_BUFFER,
|
||
|
MAX_BUFFER);
|
||
|
}
|
||
|
|
||
|
static int acp_dma_close(struct snd_pcm_substream *substream)
|
||
|
{
|
||
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
||
|
struct audio_substream_data *rtd = runtime->private_data;
|
||
|
struct snd_soc_pcm_runtime *prtd = substream->private_data;
|
||
|
struct audio_drv_data *adata = dev_get_drvdata(prtd->platform->dev);
|
||
|
|
||
|
kfree(rtd);
|
||
|
|
||
|
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
|
||
|
adata->play_stream = NULL;
|
||
|
else
|
||
|
adata->capture_stream = NULL;
|
||
|
|
||
|
/* Disable ACP irq, when the current stream is being closed and
|
||
|
* another stream is also not active.
|
||
|
*/
|
||
|
if (!adata->play_stream && !adata->capture_stream)
|
||
|
acp_reg_write(0, adata->acp_mmio, mmACP_EXTERNAL_INTR_ENB);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static struct snd_pcm_ops acp_dma_ops = {
|
||
|
.open = acp_dma_open,
|
||
|
.close = acp_dma_close,
|
||
|
.ioctl = snd_pcm_lib_ioctl,
|
||
|
.hw_params = acp_dma_hw_params,
|
||
|
.hw_free = acp_dma_hw_free,
|
||
|
.trigger = acp_dma_trigger,
|
||
|
.pointer = acp_dma_pointer,
|
||
|
.mmap = acp_dma_mmap,
|
||
|
.prepare = acp_dma_prepare,
|
||
|
};
|
||
|
|
||
|
static struct snd_soc_platform_driver acp_asoc_platform = {
|
||
|
.ops = &acp_dma_ops,
|
||
|
.pcm_new = acp_dma_new,
|
||
|
};
|
||
|
|
||
|
static int acp_audio_probe(struct platform_device *pdev)
|
||
|
{
|
||
|
int status;
|
||
|
struct audio_drv_data *audio_drv_data;
|
||
|
struct resource *res;
|
||
|
|
||
|
audio_drv_data = devm_kzalloc(&pdev->dev, sizeof(struct audio_drv_data),
|
||
|
GFP_KERNEL);
|
||
|
if (audio_drv_data == NULL)
|
||
|
return -ENOMEM;
|
||
|
|
||
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||
|
audio_drv_data->acp_mmio = devm_ioremap_resource(&pdev->dev, res);
|
||
|
|
||
|
/* The following members gets populated in device 'open'
|
||
|
* function. Till then interrupts are disabled in 'acp_init'
|
||
|
* and device doesn't generate any interrupts.
|
||
|
*/
|
||
|
|
||
|
audio_drv_data->play_stream = NULL;
|
||
|
audio_drv_data->capture_stream = NULL;
|
||
|
|
||
|
res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
|
||
|
if (!res) {
|
||
|
dev_err(&pdev->dev, "IORESOURCE_IRQ FAILED\n");
|
||
|
return -ENODEV;
|
||
|
}
|
||
|
|
||
|
status = devm_request_irq(&pdev->dev, res->start, dma_irq_handler,
|
||
|
0, "ACP_IRQ", &pdev->dev);
|
||
|
if (status) {
|
||
|
dev_err(&pdev->dev, "ACP IRQ request failed\n");
|
||
|
return status;
|
||
|
}
|
||
|
|
||
|
dev_set_drvdata(&pdev->dev, audio_drv_data);
|
||
|
|
||
|
/* Initialize the ACP */
|
||
|
acp_init(audio_drv_data->acp_mmio);
|
||
|
|
||
|
status = snd_soc_register_platform(&pdev->dev, &acp_asoc_platform);
|
||
|
if (status != 0) {
|
||
|
dev_err(&pdev->dev, "Fail to register ALSA platform device\n");
|
||
|
return status;
|
||
|
}
|
||
|
|
||
|
return status;
|
||
|
}
|
||
|
|
||
|
static int acp_audio_remove(struct platform_device *pdev)
|
||
|
{
|
||
|
struct audio_drv_data *adata = dev_get_drvdata(&pdev->dev);
|
||
|
|
||
|
acp_deinit(adata->acp_mmio);
|
||
|
snd_soc_unregister_platform(&pdev->dev);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static struct platform_driver acp_dma_driver = {
|
||
|
.probe = acp_audio_probe,
|
||
|
.remove = acp_audio_remove,
|
||
|
.driver = {
|
||
|
.name = "acp_audio_dma",
|
||
|
},
|
||
|
};
|
||
|
|
||
|
module_platform_driver(acp_dma_driver);
|
||
|
|
||
|
MODULE_AUTHOR("Maruthi.Bayyavarapu@amd.com");
|
||
|
MODULE_DESCRIPTION("AMD ACP PCM Driver");
|
||
|
MODULE_LICENSE("GPL v2");
|
||
|
MODULE_ALIAS("platform:acp-dma-audio");
|