--- /dev/null
+/*
+ * AMD ALSA SoC PCM Driver for ACP 2.x
+ *
+ * Copyright 2014-2015 Advanced Micro Devices, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ */
+
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/sizes.h>
+
+#include <sound/soc.h>
+
+#include "acp.h"
+
+#define PLAYBACK_MIN_NUM_PERIODS 2
+#define PLAYBACK_MAX_NUM_PERIODS 2
+#define PLAYBACK_MAX_PERIOD_SIZE 16384
+#define PLAYBACK_MIN_PERIOD_SIZE 1024
+#define CAPTURE_MIN_NUM_PERIODS 2
+#define CAPTURE_MAX_NUM_PERIODS 2
+#define CAPTURE_MAX_PERIOD_SIZE 16384
+#define CAPTURE_MIN_PERIOD_SIZE 1024
+
+#define MAX_BUFFER (PLAYBACK_MAX_PERIOD_SIZE * PLAYBACK_MAX_NUM_PERIODS)
+#define MIN_BUFFER MAX_BUFFER
+
+static const struct snd_pcm_hardware acp_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_BATCH |
+ SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME,
+ .formats = SNDRV_PCM_FMTBIT_S16_LE |
+ SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE,
+ .channels_min = 1,
+ .channels_max = 8,
+ .rates = SNDRV_PCM_RATE_8000_96000,
+ .rate_min = 8000,
+ .rate_max = 96000,
+ .buffer_bytes_max = PLAYBACK_MAX_NUM_PERIODS * PLAYBACK_MAX_PERIOD_SIZE,
+ .period_bytes_min = PLAYBACK_MIN_PERIOD_SIZE,
+ .period_bytes_max = PLAYBACK_MAX_PERIOD_SIZE,
+ .periods_min = PLAYBACK_MIN_NUM_PERIODS,
+ .periods_max = PLAYBACK_MAX_NUM_PERIODS,
+};
+
+static const struct snd_pcm_hardware acp_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_BATCH |
+ SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME,
+ .formats = SNDRV_PCM_FMTBIT_S16_LE |
+ SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE,
+ .channels_min = 1,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_8000_48000,
+ .rate_min = 8000,
+ .rate_max = 48000,
+ .buffer_bytes_max = CAPTURE_MAX_NUM_PERIODS * CAPTURE_MAX_PERIOD_SIZE,
+ .period_bytes_min = CAPTURE_MIN_PERIOD_SIZE,
+ .period_bytes_max = CAPTURE_MAX_PERIOD_SIZE,
+ .periods_min = CAPTURE_MIN_NUM_PERIODS,
+ .periods_max = CAPTURE_MAX_NUM_PERIODS,
+};
+
+struct audio_drv_data {
+ struct snd_pcm_substream *play_stream;
+ struct snd_pcm_substream *capture_stream;
+ void __iomem *acp_mmio;
+};
+
+static u32 acp_reg_read(void __iomem *acp_mmio, u32 reg)
+{
+ return readl(acp_mmio + (reg * 4));
+}
+
+static void acp_reg_write(u32 val, void __iomem *acp_mmio, u32 reg)
+{
+ writel(val, acp_mmio + (reg * 4));
+}
+
+/* Configure a given dma channel parameters - enable/disble,
+ * number of descriptors, priority
+ */
+static void config_acp_dma_channel(void __iomem *acp_mmio, u8 ch_num,
+ u16 dscr_strt_idx, u16 num_dscrs,
+ enum acp_dma_priority_level priority_level)
+{
+ u32 dma_ctrl;
+
+ /* disable the channel run field */
+ dma_ctrl = acp_reg_read(acp_mmio, mmACP_DMA_CNTL_0 + ch_num);
+ dma_ctrl &= ~ACP_DMA_CNTL_0__DMAChRun_MASK;
+ acp_reg_write(dma_ctrl, acp_mmio, mmACP_DMA_CNTL_0 + ch_num);
+
+ /* program a DMA channel with first descriptor to be processed. */
+ acp_reg_write((ACP_DMA_DSCR_STRT_IDX_0__DMAChDscrStrtIdx_MASK
+ & dscr_strt_idx),
+ acp_mmio, mmACP_DMA_DSCR_STRT_IDX_0 + ch_num);
+
+ /* program a DMA channel with the number of descriptors to be
+ * processed in the transfer
+ */
+ acp_reg_write(ACP_DMA_DSCR_CNT_0__DMAChDscrCnt_MASK & num_dscrs,
+ acp_mmio, mmACP_DMA_DSCR_CNT_0 + ch_num);
+
+ /* set DMA channel priority */
+ acp_reg_write(priority_level, acp_mmio, mmACP_DMA_PRIO_0 + ch_num);
+}
+
+/* Initialize a dma descriptor in SRAM based on descritor information passed */
+static void config_dma_descriptor_in_sram(void __iomem *acp_mmio,
+ u16 descr_idx,
+ acp_dma_dscr_transfer_t *descr_info)
+{
+ u32 sram_offset;
+
+ sram_offset = (descr_idx * sizeof(acp_dma_dscr_transfer_t));
+
+ /* program the source base address. */
+ acp_reg_write(sram_offset, acp_mmio, mmACP_SRBM_Targ_Idx_Addr);
+ acp_reg_write(descr_info->src, acp_mmio, mmACP_SRBM_Targ_Idx_Data);
+ /* program the destination base address. */
+ acp_reg_write(sram_offset + 4, acp_mmio, mmACP_SRBM_Targ_Idx_Addr);
+ acp_reg_write(descr_info->dest, acp_mmio, mmACP_SRBM_Targ_Idx_Data);
+
+ /* program the number of bytes to be transferred for this descriptor. */
+ acp_reg_write(sram_offset + 8, acp_mmio, mmACP_SRBM_Targ_Idx_Addr);
+ acp_reg_write(descr_info->xfer_val, acp_mmio, mmACP_SRBM_Targ_Idx_Data);
+}
+
+/* Initialize the DMA descriptor information for transfer between
+ * system memory <-> ACP SRAM
+ */
+static void set_acp_sysmem_dma_descriptors(void __iomem *acp_mmio,
+ u32 size, int direction,
+ u32 pte_offset)
+{
+ u16 i;
+ u16 dma_dscr_idx = PLAYBACK_START_DMA_DESCR_CH12;
+ acp_dma_dscr_transfer_t dmadscr[NUM_DSCRS_PER_CHANNEL];
+
+ for (i = 0; i < NUM_DSCRS_PER_CHANNEL; i++) {
+ dmadscr[i].xfer_val = 0;
+ if (direction == SNDRV_PCM_STREAM_PLAYBACK) {
+ dma_dscr_idx = PLAYBACK_START_DMA_DESCR_CH12 + i;
+ dmadscr[i].dest = ACP_SHARED_RAM_BANK_1_ADDRESS +
+ (size / 2) - (i * (size/2));
+ dmadscr[i].src = ACP_INTERNAL_APERTURE_WINDOW_0_ADDRESS
+ + (pte_offset * SZ_4K) + (i * (size/2));
+ dmadscr[i].xfer_val |=
+ (ACP_DMA_ATTRIBUTES_DAGB_ONION_TO_SHAREDMEM << 16) |
+ (size / 2);
+ } else {
+ dma_dscr_idx = CAPTURE_START_DMA_DESCR_CH14 + i;
+ dmadscr[i].src = ACP_SHARED_RAM_BANK_5_ADDRESS +
+ (i * (size/2));
+ dmadscr[i].dest = ACP_INTERNAL_APERTURE_WINDOW_0_ADDRESS
+ + (pte_offset * SZ_4K) +
+ (i * (size/2));
+ dmadscr[i].xfer_val |=
+ BIT(22) |
+ (ACP_DMA_ATTRIBUTES_SHAREDMEM_TO_DAGB_ONION << 16) |
+ (size / 2);
+ }
+ config_dma_descriptor_in_sram(acp_mmio, dma_dscr_idx,
+ &dmadscr[i]);
+ }
+ if (direction == SNDRV_PCM_STREAM_PLAYBACK)
+ config_acp_dma_channel(acp_mmio, SYSRAM_TO_ACP_CH_NUM,
+ PLAYBACK_START_DMA_DESCR_CH12,
+ NUM_DSCRS_PER_CHANNEL,
+ ACP_DMA_PRIORITY_LEVEL_NORMAL);
+ else
+ config_acp_dma_channel(acp_mmio, ACP_TO_SYSRAM_CH_NUM,
+ CAPTURE_START_DMA_DESCR_CH14,
+ NUM_DSCRS_PER_CHANNEL,
+ ACP_DMA_PRIORITY_LEVEL_NORMAL);
+}
+
+/* Initialize the DMA descriptor information for transfer between
+ * ACP SRAM <-> I2S
+ */
+static void set_acp_to_i2s_dma_descriptors(void __iomem *acp_mmio,
+ u32 size, int direction)
+{
+
+ u16 i;
+ u16 dma_dscr_idx = PLAYBACK_START_DMA_DESCR_CH13;
+ acp_dma_dscr_transfer_t dmadscr[NUM_DSCRS_PER_CHANNEL];
+
+ for (i = 0; i < NUM_DSCRS_PER_CHANNEL; i++) {
+ dmadscr[i].xfer_val = 0;
+ if (direction == SNDRV_PCM_STREAM_PLAYBACK) {
+ dma_dscr_idx = PLAYBACK_START_DMA_DESCR_CH13 + i;
+ dmadscr[i].src = ACP_SHARED_RAM_BANK_1_ADDRESS +
+ (i * (size/2));
+ /* dmadscr[i].dest is unused by hardware. */
+ dmadscr[i].dest = 0;
+ dmadscr[i].xfer_val |= BIT(22) | (TO_ACP_I2S_1 << 16) |
+ (size / 2);
+ } else {
+ dma_dscr_idx = CAPTURE_START_DMA_DESCR_CH15 + i;
+ /* dmadscr[i].src is unused by hardware. */
+ dmadscr[i].src = 0;
+ dmadscr[i].dest = ACP_SHARED_RAM_BANK_5_ADDRESS +
+ (i * (size / 2));
+ dmadscr[i].xfer_val |= BIT(22) |
+ (FROM_ACP_I2S_1 << 16) | (size / 2);
+ }
+ config_dma_descriptor_in_sram(acp_mmio, dma_dscr_idx,
+ &dmadscr[i]);
+ }
+ /* Configure the DMA channel with the above descriptore */
+ if (direction == SNDRV_PCM_STREAM_PLAYBACK)
+ config_acp_dma_channel(acp_mmio, ACP_TO_I2S_DMA_CH_NUM,
+ PLAYBACK_START_DMA_DESCR_CH13,
+ NUM_DSCRS_PER_CHANNEL,
+ ACP_DMA_PRIORITY_LEVEL_NORMAL);
+ else
+ config_acp_dma_channel(acp_mmio, I2S_TO_ACP_DMA_CH_NUM,
+ CAPTURE_START_DMA_DESCR_CH15,
+ NUM_DSCRS_PER_CHANNEL,
+ ACP_DMA_PRIORITY_LEVEL_NORMAL);
+}
+
+/* Create page table entries in ACP SRAM for the allocated memory */
+static void acp_pte_config(void __iomem *acp_mmio, struct page *pg,
+ u16 num_of_pages, u32 pte_offset)
+{
+ u16 page_idx;
+ u64 addr;
+ u32 low;
+ u32 high;
+ u32 offset;
+
+ offset = ACP_DAGB_GRP_SRBM_SRAM_BASE_OFFSET + (pte_offset * 8);
+ for (page_idx = 0; page_idx < (num_of_pages); page_idx++) {
+ /* Load the low address of page int ACP SRAM through SRBM */
+ acp_reg_write((offset + (page_idx * 8)),
+ acp_mmio, mmACP_SRBM_Targ_Idx_Addr);
+ addr = page_to_phys(pg);
+
+ low = lower_32_bits(addr);
+ high = upper_32_bits(addr);
+
+ acp_reg_write(low, acp_mmio, mmACP_SRBM_Targ_Idx_Data);
+
+ /* Load the High address of page int ACP SRAM through SRBM */
+ acp_reg_write((offset + (page_idx * 8) + 4),
+ acp_mmio, mmACP_SRBM_Targ_Idx_Addr);
+
+ /* page enable in ACP */
+ high |= BIT(31);
+ acp_reg_write(high, acp_mmio, mmACP_SRBM_Targ_Idx_Data);
+
+ /* Move to next physically contiguos page */
+ pg++;
+ }
+}
+
+static void config_acp_dma(void __iomem *acp_mmio,
+ struct audio_substream_data *audio_config)
+{
+ u32 pte_offset;
+
+ if (audio_config->direction == SNDRV_PCM_STREAM_PLAYBACK)
+ pte_offset = ACP_PLAYBACK_PTE_OFFSET;
+ else
+ pte_offset = ACP_CAPTURE_PTE_OFFSET;
+
+ acp_pte_config(acp_mmio, audio_config->pg, audio_config->num_of_pages,
+ pte_offset);
+
+ /* Configure System memory <-> ACP SRAM DMA descriptors */
+ set_acp_sysmem_dma_descriptors(acp_mmio, audio_config->size,
+ audio_config->direction, pte_offset);
+
+ /* Configure ACP SRAM <-> I2S DMA descriptors */
+ set_acp_to_i2s_dma_descriptors(acp_mmio, audio_config->size,
+ audio_config->direction);
+}
+
+/* Start a given DMA channel transfer */
+static void acp_dma_start(void __iomem *acp_mmio,
+ u16 ch_num, bool is_circular)
+{
+ u32 dma_ctrl;
+
+ /* read the dma control register and disable the channel run field */
+ dma_ctrl = acp_reg_read(acp_mmio, mmACP_DMA_CNTL_0 + ch_num);
+
+ /* Invalidating the DAGB cache */
+ acp_reg_write(1, acp_mmio, mmACP_DAGB_ATU_CTRL);
+
+ /* configure the DMA channel and start the DMA transfer
+ * set dmachrun bit to start the transfer and enable the
+ * interrupt on completion of the dma transfer
+ */
+ dma_ctrl |= ACP_DMA_CNTL_0__DMAChRun_MASK;
+
+ switch (ch_num) {
+ case ACP_TO_I2S_DMA_CH_NUM:
+ case ACP_TO_SYSRAM_CH_NUM:
+ case I2S_TO_ACP_DMA_CH_NUM:
+ dma_ctrl |= ACP_DMA_CNTL_0__DMAChIOCEn_MASK;
+ break;
+ default:
+ dma_ctrl &= ~ACP_DMA_CNTL_0__DMAChIOCEn_MASK;
+ break;
+ }
+
+ /* enable for ACP SRAM to/from I2S DMA channel */
+ if (is_circular == true)
+ dma_ctrl |= ACP_DMA_CNTL_0__Circular_DMA_En_MASK;
+ else
+ dma_ctrl &= ~ACP_DMA_CNTL_0__Circular_DMA_En_MASK;
+
+ acp_reg_write(dma_ctrl, acp_mmio, mmACP_DMA_CNTL_0 + ch_num);
+}
+
+/* Stop a given DMA channel transfer */
+static int acp_dma_stop(void __iomem *acp_mmio, u8 ch_num)
+{
+ u32 dma_ctrl;
+ u32 dma_ch_sts;
+ u32 count = ACP_DMA_RESET_TIME;
+
+ dma_ctrl = acp_reg_read(acp_mmio, mmACP_DMA_CNTL_0 + ch_num);
+
+ /* clear the dma control register fields before writing zero
+ * in reset bit
+ */
+ dma_ctrl &= ~ACP_DMA_CNTL_0__DMAChRun_MASK;
+ dma_ctrl &= ~ACP_DMA_CNTL_0__DMAChIOCEn_MASK;
+
+ acp_reg_write(dma_ctrl, acp_mmio, mmACP_DMA_CNTL_0 + ch_num);
+ dma_ch_sts = acp_reg_read(acp_mmio, mmACP_DMA_CH_STS);
+
+ if (dma_ch_sts & BIT(ch_num)) {
+ /* set the reset bit for this channel to stop the dma
+ * transfer
+ */
+ dma_ctrl |= ACP_DMA_CNTL_0__DMAChRst_MASK;
+ acp_reg_write(dma_ctrl, acp_mmio, mmACP_DMA_CNTL_0 + ch_num);
+ }
+
+ /* check the channel status bit for some time and return the status */
+ while (true) {
+ dma_ch_sts = acp_reg_read(acp_mmio, mmACP_DMA_CH_STS);
+ if (!(dma_ch_sts & BIT(ch_num))) {
+ /* clear the reset flag after successfully stopping
+ * the dma transfer and break from the loop
+ */
+ 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");
projects / cascardo / linux.git / commitdiff