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Diffstat (limited to 'sound/x86/intel_hdmi_audio.c')
| -rw-r--r-- | sound/x86/intel_hdmi_audio.c | 1955 |
1 files changed, 1955 insertions, 0 deletions
diff --git a/sound/x86/intel_hdmi_audio.c b/sound/x86/intel_hdmi_audio.c new file mode 100644 index 000000000..3841336dc --- /dev/null +++ b/sound/x86/intel_hdmi_audio.c @@ -0,0 +1,1955 @@ +/* + * intel_hdmi_audio.c - Intel HDMI audio driver + * + * Copyright (C) 2016 Intel Corp + * Authors: Sailaja Bandarupalli <sailaja.bandarupalli@intel.com> + * Ramesh Babu K V <ramesh.babu@intel.com> + * Vaibhav Agarwal <vaibhav.agarwal@intel.com> + * Jerome Anand <jerome.anand@intel.com> + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * ALSA driver for Intel HDMI audio + */ + +#include <linux/types.h> +#include <linux/platform_device.h> +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/interrupt.h> +#include <linux/pm_runtime.h> +#include <linux/dma-mapping.h> +#include <linux/delay.h> +#include <asm/set_memory.h> +#include <sound/core.h> +#include <sound/asoundef.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/initval.h> +#include <sound/control.h> +#include <sound/jack.h> +#include <drm/drm_edid.h> +#include <drm/intel_lpe_audio.h> +#include "intel_hdmi_audio.h" + +#define for_each_pipe(card_ctx, pipe) \ + for ((pipe) = 0; (pipe) < (card_ctx)->num_pipes; (pipe)++) +#define for_each_port(card_ctx, port) \ + for ((port) = 0; (port) < (card_ctx)->num_ports; (port)++) + +/*standard module options for ALSA. This module supports only one card*/ +static int hdmi_card_index = SNDRV_DEFAULT_IDX1; +static char *hdmi_card_id = SNDRV_DEFAULT_STR1; +static bool single_port; + +module_param_named(index, hdmi_card_index, int, 0444); +MODULE_PARM_DESC(index, + "Index value for INTEL Intel HDMI Audio controller."); +module_param_named(id, hdmi_card_id, charp, 0444); +MODULE_PARM_DESC(id, + "ID string for INTEL Intel HDMI Audio controller."); +module_param(single_port, bool, 0444); +MODULE_PARM_DESC(single_port, + "Single-port mode (for compatibility)"); + +/* + * ELD SA bits in the CEA Speaker Allocation data block + */ +static const int eld_speaker_allocation_bits[] = { + [0] = FL | FR, + [1] = LFE, + [2] = FC, + [3] = RL | RR, + [4] = RC, + [5] = FLC | FRC, + [6] = RLC | RRC, + /* the following are not defined in ELD yet */ + [7] = 0, +}; + +/* + * This is an ordered list! + * + * The preceding ones have better chances to be selected by + * hdmi_channel_allocation(). + */ +static struct cea_channel_speaker_allocation channel_allocations[] = { +/* channel: 7 6 5 4 3 2 1 0 */ +{ .ca_index = 0x00, .speakers = { 0, 0, 0, 0, 0, 0, FR, FL } }, + /* 2.1 */ +{ .ca_index = 0x01, .speakers = { 0, 0, 0, 0, 0, LFE, FR, FL } }, + /* Dolby Surround */ +{ .ca_index = 0x02, .speakers = { 0, 0, 0, 0, FC, 0, FR, FL } }, + /* surround40 */ +{ .ca_index = 0x08, .speakers = { 0, 0, RR, RL, 0, 0, FR, FL } }, + /* surround41 */ +{ .ca_index = 0x09, .speakers = { 0, 0, RR, RL, 0, LFE, FR, FL } }, + /* surround50 */ +{ .ca_index = 0x0a, .speakers = { 0, 0, RR, RL, FC, 0, FR, FL } }, + /* surround51 */ +{ .ca_index = 0x0b, .speakers = { 0, 0, RR, RL, FC, LFE, FR, FL } }, + /* 6.1 */ +{ .ca_index = 0x0f, .speakers = { 0, RC, RR, RL, FC, LFE, FR, FL } }, + /* surround71 */ +{ .ca_index = 0x13, .speakers = { RRC, RLC, RR, RL, FC, LFE, FR, FL } }, + +{ .ca_index = 0x03, .speakers = { 0, 0, 0, 0, FC, LFE, FR, FL } }, +{ .ca_index = 0x04, .speakers = { 0, 0, 0, RC, 0, 0, FR, FL } }, +{ .ca_index = 0x05, .speakers = { 0, 0, 0, RC, 0, LFE, FR, FL } }, +{ .ca_index = 0x06, .speakers = { 0, 0, 0, RC, FC, 0, FR, FL } }, +{ .ca_index = 0x07, .speakers = { 0, 0, 0, RC, FC, LFE, FR, FL } }, +{ .ca_index = 0x0c, .speakers = { 0, RC, RR, RL, 0, 0, FR, FL } }, +{ .ca_index = 0x0d, .speakers = { 0, RC, RR, RL, 0, LFE, FR, FL } }, +{ .ca_index = 0x0e, .speakers = { 0, RC, RR, RL, FC, 0, FR, FL } }, +{ .ca_index = 0x10, .speakers = { RRC, RLC, RR, RL, 0, 0, FR, FL } }, +{ .ca_index = 0x11, .speakers = { RRC, RLC, RR, RL, 0, LFE, FR, FL } }, +{ .ca_index = 0x12, .speakers = { RRC, RLC, RR, RL, FC, 0, FR, FL } }, +{ .ca_index = 0x14, .speakers = { FRC, FLC, 0, 0, 0, 0, FR, FL } }, +{ .ca_index = 0x15, .speakers = { FRC, FLC, 0, 0, 0, LFE, FR, FL } }, +{ .ca_index = 0x16, .speakers = { FRC, FLC, 0, 0, FC, 0, FR, FL } }, +{ .ca_index = 0x17, .speakers = { FRC, FLC, 0, 0, FC, LFE, FR, FL } }, +{ .ca_index = 0x18, .speakers = { FRC, FLC, 0, RC, 0, 0, FR, FL } }, +{ .ca_index = 0x19, .speakers = { FRC, FLC, 0, RC, 0, LFE, FR, FL } }, +{ .ca_index = 0x1a, .speakers = { FRC, FLC, 0, RC, FC, 0, FR, FL } }, +{ .ca_index = 0x1b, .speakers = { FRC, FLC, 0, RC, FC, LFE, FR, FL } }, +{ .ca_index = 0x1c, .speakers = { FRC, FLC, RR, RL, 0, 0, FR, FL } }, +{ .ca_index = 0x1d, .speakers = { FRC, FLC, RR, RL, 0, LFE, FR, FL } }, +{ .ca_index = 0x1e, .speakers = { FRC, FLC, RR, RL, FC, 0, FR, FL } }, +{ .ca_index = 0x1f, .speakers = { FRC, FLC, RR, RL, FC, LFE, FR, FL } }, +}; + +static const struct channel_map_table map_tables[] = { + { SNDRV_CHMAP_FL, 0x00, FL }, + { SNDRV_CHMAP_FR, 0x01, FR }, + { SNDRV_CHMAP_RL, 0x04, RL }, + { SNDRV_CHMAP_RR, 0x05, RR }, + { SNDRV_CHMAP_LFE, 0x02, LFE }, + { SNDRV_CHMAP_FC, 0x03, FC }, + { SNDRV_CHMAP_RLC, 0x06, RLC }, + { SNDRV_CHMAP_RRC, 0x07, RRC }, + {} /* terminator */ +}; + +/* hardware capability structure */ +static const struct snd_pcm_hardware had_pcm_hardware = { + .info = (SNDRV_PCM_INFO_INTERLEAVED | + SNDRV_PCM_INFO_MMAP | + SNDRV_PCM_INFO_MMAP_VALID | + SNDRV_PCM_INFO_NO_PERIOD_WAKEUP), + .formats = (SNDRV_PCM_FMTBIT_S16_LE | + SNDRV_PCM_FMTBIT_S24_LE | + SNDRV_PCM_FMTBIT_S32_LE), + .rates = SNDRV_PCM_RATE_32000 | + SNDRV_PCM_RATE_44100 | + SNDRV_PCM_RATE_48000 | + SNDRV_PCM_RATE_88200 | + SNDRV_PCM_RATE_96000 | + SNDRV_PCM_RATE_176400 | + SNDRV_PCM_RATE_192000, + .rate_min = HAD_MIN_RATE, + .rate_max = HAD_MAX_RATE, + .channels_min = HAD_MIN_CHANNEL, + .channels_max = HAD_MAX_CHANNEL, + .buffer_bytes_max = HAD_MAX_BUFFER, + .period_bytes_min = HAD_MIN_PERIOD_BYTES, + .period_bytes_max = HAD_MAX_PERIOD_BYTES, + .periods_min = HAD_MIN_PERIODS, + .periods_max = HAD_MAX_PERIODS, + .fifo_size = HAD_FIFO_SIZE, +}; + +/* Get the active PCM substream; + * Call had_substream_put() for unreferecing. + * Don't call this inside had_spinlock, as it takes by itself + */ +static struct snd_pcm_substream * +had_substream_get(struct snd_intelhad *intelhaddata) +{ + struct snd_pcm_substream *substream; + unsigned long flags; + + spin_lock_irqsave(&intelhaddata->had_spinlock, flags); + substream = intelhaddata->stream_info.substream; + if (substream) + intelhaddata->stream_info.substream_refcount++; + spin_unlock_irqrestore(&intelhaddata->had_spinlock, flags); + return substream; +} + +/* Unref the active PCM substream; + * Don't call this inside had_spinlock, as it takes by itself + */ +static void had_substream_put(struct snd_intelhad *intelhaddata) +{ + unsigned long flags; + + spin_lock_irqsave(&intelhaddata->had_spinlock, flags); + intelhaddata->stream_info.substream_refcount--; + spin_unlock_irqrestore(&intelhaddata->had_spinlock, flags); +} + +static u32 had_config_offset(int pipe) +{ + switch (pipe) { + default: + case 0: + return AUDIO_HDMI_CONFIG_A; + case 1: + return AUDIO_HDMI_CONFIG_B; + case 2: + return AUDIO_HDMI_CONFIG_C; + } +} + +/* Register access functions */ +static u32 had_read_register_raw(struct snd_intelhad_card *card_ctx, + int pipe, u32 reg) +{ + return ioread32(card_ctx->mmio_start + had_config_offset(pipe) + reg); +} + +static void had_write_register_raw(struct snd_intelhad_card *card_ctx, + int pipe, u32 reg, u32 val) +{ + iowrite32(val, card_ctx->mmio_start + had_config_offset(pipe) + reg); +} + +static void had_read_register(struct snd_intelhad *ctx, u32 reg, u32 *val) +{ + if (!ctx->connected) + *val = 0; + else + *val = had_read_register_raw(ctx->card_ctx, ctx->pipe, reg); +} + +static void had_write_register(struct snd_intelhad *ctx, u32 reg, u32 val) +{ + if (ctx->connected) + had_write_register_raw(ctx->card_ctx, ctx->pipe, reg, val); +} + +/* + * enable / disable audio configuration + * + * The normal read/modify should not directly be used on VLV2 for + * updating AUD_CONFIG register. + * This is because: + * Bit6 of AUD_CONFIG register is writeonly due to a silicon bug on VLV2 + * HDMI IP. As a result a read-modify of AUD_CONFIG regiter will always + * clear bit6. AUD_CONFIG[6:4] represents the "channels" field of the + * register. This field should be 1xy binary for configuration with 6 or + * more channels. Read-modify of AUD_CONFIG (Eg. for enabling audio) + * causes the "channels" field to be updated as 0xy binary resulting in + * bad audio. The fix is to always write the AUD_CONFIG[6:4] with + * appropriate value when doing read-modify of AUD_CONFIG register. + */ +static void had_enable_audio(struct snd_intelhad *intelhaddata, + bool enable) +{ + /* update the cached value */ + intelhaddata->aud_config.regx.aud_en = enable; + had_write_register(intelhaddata, AUD_CONFIG, + intelhaddata->aud_config.regval); +} + +/* forcibly ACKs to both BUFFER_DONE and BUFFER_UNDERRUN interrupts */ +static void had_ack_irqs(struct snd_intelhad *ctx) +{ + u32 status_reg; + + if (!ctx->connected) + return; + had_read_register(ctx, AUD_HDMI_STATUS, &status_reg); + status_reg |= HDMI_AUDIO_BUFFER_DONE | HDMI_AUDIO_UNDERRUN; + had_write_register(ctx, AUD_HDMI_STATUS, status_reg); + had_read_register(ctx, AUD_HDMI_STATUS, &status_reg); +} + +/* Reset buffer pointers */ +static void had_reset_audio(struct snd_intelhad *intelhaddata) +{ + had_write_register(intelhaddata, AUD_HDMI_STATUS, + AUD_HDMI_STATUSG_MASK_FUNCRST); + had_write_register(intelhaddata, AUD_HDMI_STATUS, 0); +} + +/* + * initialize audio channel status registers + * This function is called in the prepare callback + */ +static int had_prog_status_reg(struct snd_pcm_substream *substream, + struct snd_intelhad *intelhaddata) +{ + union aud_ch_status_0 ch_stat0 = {.regval = 0}; + union aud_ch_status_1 ch_stat1 = {.regval = 0}; + + ch_stat0.regx.lpcm_id = (intelhaddata->aes_bits & + IEC958_AES0_NONAUDIO) >> 1; + ch_stat0.regx.clk_acc = (intelhaddata->aes_bits & + IEC958_AES3_CON_CLOCK) >> 4; + + switch (substream->runtime->rate) { + case AUD_SAMPLE_RATE_32: + ch_stat0.regx.samp_freq = CH_STATUS_MAP_32KHZ; + break; + + case AUD_SAMPLE_RATE_44_1: + ch_stat0.regx.samp_freq = CH_STATUS_MAP_44KHZ; + break; + case AUD_SAMPLE_RATE_48: + ch_stat0.regx.samp_freq = CH_STATUS_MAP_48KHZ; + break; + case AUD_SAMPLE_RATE_88_2: + ch_stat0.regx.samp_freq = CH_STATUS_MAP_88KHZ; + break; + case AUD_SAMPLE_RATE_96: + ch_stat0.regx.samp_freq = CH_STATUS_MAP_96KHZ; + break; + case AUD_SAMPLE_RATE_176_4: + ch_stat0.regx.samp_freq = CH_STATUS_MAP_176KHZ; + break; + case AUD_SAMPLE_RATE_192: + ch_stat0.regx.samp_freq = CH_STATUS_MAP_192KHZ; + break; + + default: + /* control should never come here */ + return -EINVAL; + } + + had_write_register(intelhaddata, + AUD_CH_STATUS_0, ch_stat0.regval); + + switch (substream->runtime->format) { + case SNDRV_PCM_FORMAT_S16_LE: + ch_stat1.regx.max_wrd_len = MAX_SMPL_WIDTH_20; + ch_stat1.regx.wrd_len = SMPL_WIDTH_16BITS; + break; + case SNDRV_PCM_FORMAT_S24_LE: + case SNDRV_PCM_FORMAT_S32_LE: + ch_stat1.regx.max_wrd_len = MAX_SMPL_WIDTH_24; + ch_stat1.regx.wrd_len = SMPL_WIDTH_24BITS; + break; + default: + return -EINVAL; + } + + had_write_register(intelhaddata, + AUD_CH_STATUS_1, ch_stat1.regval); + return 0; +} + +/* + * function to initialize audio + * registers and buffer confgiuration registers + * This function is called in the prepare callback + */ +static int had_init_audio_ctrl(struct snd_pcm_substream *substream, + struct snd_intelhad *intelhaddata) +{ + union aud_cfg cfg_val = {.regval = 0}; + union aud_buf_config buf_cfg = {.regval = 0}; + u8 channels; + + had_prog_status_reg(substream, intelhaddata); + + buf_cfg.regx.audio_fifo_watermark = FIFO_THRESHOLD; + buf_cfg.regx.dma_fifo_watermark = DMA_FIFO_THRESHOLD; + buf_cfg.regx.aud_delay = 0; + had_write_register(intelhaddata, AUD_BUF_CONFIG, buf_cfg.regval); + + channels = substream->runtime->channels; + cfg_val.regx.num_ch = channels - 2; + if (channels <= 2) + cfg_val.regx.layout = LAYOUT0; + else + cfg_val.regx.layout = LAYOUT1; + + if (substream->runtime->format == SNDRV_PCM_FORMAT_S16_LE) + cfg_val.regx.packet_mode = 1; + + if (substream->runtime->format == SNDRV_PCM_FORMAT_S32_LE) + cfg_val.regx.left_align = 1; + + cfg_val.regx.val_bit = 1; + + /* fix up the DP bits */ + if (intelhaddata->dp_output) { + cfg_val.regx.dp_modei = 1; + cfg_val.regx.set = 1; + } + + had_write_register(intelhaddata, AUD_CONFIG, cfg_val.regval); + intelhaddata->aud_config = cfg_val; + return 0; +} + +/* + * Compute derived values in channel_allocations[]. + */ +static void init_channel_allocations(void) +{ + int i, j; + struct cea_channel_speaker_allocation *p; + + for (i = 0; i < ARRAY_SIZE(channel_allocations); i++) { + p = channel_allocations + i; + p->channels = 0; + p->spk_mask = 0; + for (j = 0; j < ARRAY_SIZE(p->speakers); j++) + if (p->speakers[j]) { + p->channels++; + p->spk_mask |= p->speakers[j]; + } + } +} + +/* + * The transformation takes two steps: + * + * eld->spk_alloc => (eld_speaker_allocation_bits[]) => spk_mask + * spk_mask => (channel_allocations[]) => ai->CA + * + * TODO: it could select the wrong CA from multiple candidates. + */ +static int had_channel_allocation(struct snd_intelhad *intelhaddata, + int channels) +{ + int i; + int ca = 0; + int spk_mask = 0; + + /* + * CA defaults to 0 for basic stereo audio + */ + if (channels <= 2) + return 0; + + /* + * expand ELD's speaker allocation mask + * + * ELD tells the speaker mask in a compact(paired) form, + * expand ELD's notions to match the ones used by Audio InfoFrame. + */ + + for (i = 0; i < ARRAY_SIZE(eld_speaker_allocation_bits); i++) { + if (intelhaddata->eld[DRM_ELD_SPEAKER] & (1 << i)) + spk_mask |= eld_speaker_allocation_bits[i]; + } + + /* search for the first working match in the CA table */ + for (i = 0; i < ARRAY_SIZE(channel_allocations); i++) { + if (channels == channel_allocations[i].channels && + (spk_mask & channel_allocations[i].spk_mask) == + channel_allocations[i].spk_mask) { + ca = channel_allocations[i].ca_index; + break; + } + } + + dev_dbg(intelhaddata->dev, "select CA 0x%x for %d\n", ca, channels); + + return ca; +} + +/* from speaker bit mask to ALSA API channel position */ +static int spk_to_chmap(int spk) +{ + const struct channel_map_table *t = map_tables; + + for (; t->map; t++) { + if (t->spk_mask == spk) + return t->map; + } + return 0; +} + +static void had_build_channel_allocation_map(struct snd_intelhad *intelhaddata) +{ + int i, c; + int spk_mask = 0; + struct snd_pcm_chmap_elem *chmap; + u8 eld_high, eld_high_mask = 0xF0; + u8 high_msb; + + kfree(intelhaddata->chmap->chmap); + intelhaddata->chmap->chmap = NULL; + + chmap = kzalloc(sizeof(*chmap), GFP_KERNEL); + if (!chmap) + return; + + dev_dbg(intelhaddata->dev, "eld speaker = %x\n", + intelhaddata->eld[DRM_ELD_SPEAKER]); + + /* WA: Fix the max channel supported to 8 */ + + /* + * Sink may support more than 8 channels, if eld_high has more than + * one bit set. SOC supports max 8 channels. + * Refer eld_speaker_allocation_bits, for sink speaker allocation + */ + + /* if 0x2F < eld < 0x4F fall back to 0x2f, else fall back to 0x4F */ + eld_high = intelhaddata->eld[DRM_ELD_SPEAKER] & eld_high_mask; + if ((eld_high & (eld_high-1)) && (eld_high > 0x1F)) { + /* eld_high & (eld_high-1): if more than 1 bit set */ + /* 0x1F: 7 channels */ + for (i = 1; i < 4; i++) { + high_msb = eld_high & (0x80 >> i); + if (high_msb) { + intelhaddata->eld[DRM_ELD_SPEAKER] &= + high_msb | 0xF; + break; + } + } + } + + for (i = 0; i < ARRAY_SIZE(eld_speaker_allocation_bits); i++) { + if (intelhaddata->eld[DRM_ELD_SPEAKER] & (1 << i)) + spk_mask |= eld_speaker_allocation_bits[i]; + } + + for (i = 0; i < ARRAY_SIZE(channel_allocations); i++) { + if (spk_mask == channel_allocations[i].spk_mask) { + for (c = 0; c < channel_allocations[i].channels; c++) { + chmap->map[c] = spk_to_chmap( + channel_allocations[i].speakers[ + (MAX_SPEAKERS - 1) - c]); + } + chmap->channels = channel_allocations[i].channels; + intelhaddata->chmap->chmap = chmap; + break; + } + } + if (i >= ARRAY_SIZE(channel_allocations)) + kfree(chmap); +} + +/* + * ALSA API channel-map control callbacks + */ +static int had_chmap_ctl_info(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_info *uinfo) +{ + uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; + uinfo->count = HAD_MAX_CHANNEL; + uinfo->value.integer.min = 0; + uinfo->value.integer.max = SNDRV_CHMAP_LAST; + return 0; +} + +static int had_chmap_ctl_get(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol); + struct snd_intelhad *intelhaddata = info->private_data; + int i; + const struct snd_pcm_chmap_elem *chmap; + + memset(ucontrol->value.integer.value, 0, + sizeof(long) * HAD_MAX_CHANNEL); + mutex_lock(&intelhaddata->mutex); + if (!intelhaddata->chmap->chmap) { + mutex_unlock(&intelhaddata->mutex); + return 0; + } + + chmap = intelhaddata->chmap->chmap; + for (i = 0; i < chmap->channels; i++) + ucontrol->value.integer.value[i] = chmap->map[i]; + mutex_unlock(&intelhaddata->mutex); + + return 0; +} + +static int had_register_chmap_ctls(struct snd_intelhad *intelhaddata, + struct snd_pcm *pcm) +{ + int err; + + err = snd_pcm_add_chmap_ctls(pcm, SNDRV_PCM_STREAM_PLAYBACK, + NULL, 0, (unsigned long)intelhaddata, + &intelhaddata->chmap); + if (err < 0) + return err; + + intelhaddata->chmap->private_data = intelhaddata; + intelhaddata->chmap->kctl->info = had_chmap_ctl_info; + intelhaddata->chmap->kctl->get = had_chmap_ctl_get; + intelhaddata->chmap->chmap = NULL; + return 0; +} + +/* + * Initialize Data Island Packets registers + * This function is called in the prepare callback + */ +static void had_prog_dip(struct snd_pcm_substream *substream, + struct snd_intelhad *intelhaddata) +{ + int i; + union aud_ctrl_st ctrl_state = {.regval = 0}; + union aud_info_frame2 frame2 = {.regval = 0}; + union aud_info_frame3 frame3 = {.regval = 0}; + u8 checksum = 0; + u32 info_frame; + int channels; + int ca; + + channels = substream->runtime->channels; + + had_write_register(intelhaddata, AUD_CNTL_ST, ctrl_state.regval); + + ca = had_channel_allocation(intelhaddata, channels); + if (intelhaddata->dp_output) { + info_frame = DP_INFO_FRAME_WORD1; + frame2.regval = (substream->runtime->channels - 1) | (ca << 24); + } else { + info_frame = HDMI_INFO_FRAME_WORD1; + frame2.regx.chnl_cnt = substream->runtime->channels - 1; + frame3.regx.chnl_alloc = ca; + + /* Calculte the byte wide checksum for all valid DIP words */ + for (i = 0; i < BYTES_PER_WORD; i++) + checksum += (info_frame >> (i * 8)) & 0xff; + for (i = 0; i < BYTES_PER_WORD; i++) + checksum += (frame2.regval >> (i * 8)) & 0xff; + for (i = 0; i < BYTES_PER_WORD; i++) + checksum += (frame3.regval >> (i * 8)) & 0xff; + + frame2.regx.chksum = -(checksum); + } + + had_write_register(intelhaddata, AUD_HDMIW_INFOFR, info_frame); + had_write_register(intelhaddata, AUD_HDMIW_INFOFR, frame2.regval); + had_write_register(intelhaddata, AUD_HDMIW_INFOFR, frame3.regval); + + /* program remaining DIP words with zero */ + for (i = 0; i < HAD_MAX_DIP_WORDS-VALID_DIP_WORDS; i++) + had_write_register(intelhaddata, AUD_HDMIW_INFOFR, 0x0); + + ctrl_state.regx.dip_freq = 1; + ctrl_state.regx.dip_en_sta = 1; + had_write_register(intelhaddata, AUD_CNTL_ST, ctrl_state.regval); +} + +static int had_calculate_maud_value(u32 aud_samp_freq, u32 link_rate) +{ + u32 maud_val; + + /* Select maud according to DP 1.2 spec */ + if (link_rate == DP_2_7_GHZ) { + switch (aud_samp_freq) { + case AUD_SAMPLE_RATE_32: + maud_val = AUD_SAMPLE_RATE_32_DP_2_7_MAUD_VAL; + break; + + case AUD_SAMPLE_RATE_44_1: + maud_val = AUD_SAMPLE_RATE_44_1_DP_2_7_MAUD_VAL; + break; + + case AUD_SAMPLE_RATE_48: + maud_val = AUD_SAMPLE_RATE_48_DP_2_7_MAUD_VAL; + break; + + case AUD_SAMPLE_RATE_88_2: + maud_val = AUD_SAMPLE_RATE_88_2_DP_2_7_MAUD_VAL; + break; + + case AUD_SAMPLE_RATE_96: + maud_val = AUD_SAMPLE_RATE_96_DP_2_7_MAUD_VAL; + break; + + case AUD_SAMPLE_RATE_176_4: + maud_val = AUD_SAMPLE_RATE_176_4_DP_2_7_MAUD_VAL; + break; + + case HAD_MAX_RATE: + maud_val = HAD_MAX_RATE_DP_2_7_MAUD_VAL; + break; + + default: + maud_val = -EINVAL; + break; + } + } else if (link_rate == DP_1_62_GHZ) { + switch (aud_samp_freq) { + case AUD_SAMPLE_RATE_32: + maud_val = AUD_SAMPLE_RATE_32_DP_1_62_MAUD_VAL; + break; + + case AUD_SAMPLE_RATE_44_1: + maud_val = AUD_SAMPLE_RATE_44_1_DP_1_62_MAUD_VAL; + break; + + case AUD_SAMPLE_RATE_48: + maud_val = AUD_SAMPLE_RATE_48_DP_1_62_MAUD_VAL; + break; + + case AUD_SAMPLE_RATE_88_2: + maud_val = AUD_SAMPLE_RATE_88_2_DP_1_62_MAUD_VAL; + break; + + case AUD_SAMPLE_RATE_96: + maud_val = AUD_SAMPLE_RATE_96_DP_1_62_MAUD_VAL; + break; + + case AUD_SAMPLE_RATE_176_4: + maud_val = AUD_SAMPLE_RATE_176_4_DP_1_62_MAUD_VAL; + break; + + case HAD_MAX_RATE: + maud_val = HAD_MAX_RATE_DP_1_62_MAUD_VAL; + break; + + default: + maud_val = -EINVAL; + break; + } + } else + maud_val = -EINVAL; + + return maud_val; +} + +/* + * Program HDMI audio CTS value + * + * @aud_samp_freq: sampling frequency of audio data + * @tmds: sampling frequency of the display data + * @link_rate: DP link rate + * @n_param: N value, depends on aud_samp_freq + * @intelhaddata: substream private data + * + * Program CTS register based on the audio and display sampling frequency + */ +static void had_prog_cts(u32 aud_samp_freq, u32 tmds, u32 link_rate, + u32 n_param, struct snd_intelhad *intelhaddata) +{ + u32 cts_val; + u64 dividend, divisor; + + if (intelhaddata->dp_output) { + /* Substitute cts_val with Maud according to DP 1.2 spec*/ + cts_val = had_calculate_maud_value(aud_samp_freq, link_rate); + } else { + /* Calculate CTS according to HDMI 1.3a spec*/ + dividend = (u64)tmds * n_param*1000; + divisor = 128 * aud_samp_freq; + cts_val = div64_u64(dividend, divisor); + } + dev_dbg(intelhaddata->dev, "TMDS value=%d, N value=%d, CTS Value=%d\n", + tmds, n_param, cts_val); + had_write_register(intelhaddata, AUD_HDMI_CTS, (BIT(24) | cts_val)); +} + +static int had_calculate_n_value(u32 aud_samp_freq) +{ + int n_val; + + /* Select N according to HDMI 1.3a spec*/ + switch (aud_samp_freq) { + case AUD_SAMPLE_RATE_32: + n_val = 4096; + break; + + case AUD_SAMPLE_RATE_44_1: + n_val = 6272; + break; + + case AUD_SAMPLE_RATE_48: + n_val = 6144; + break; + + case AUD_SAMPLE_RATE_88_2: + n_val = 12544; + break; + + case AUD_SAMPLE_RATE_96: + n_val = 12288; + break; + + case AUD_SAMPLE_RATE_176_4: + n_val = 25088; + break; + + case HAD_MAX_RATE: + n_val = 24576; + break; + + default: + n_val = -EINVAL; + break; + } + return n_val; +} + +/* + * Program HDMI audio N value + * + * @aud_samp_freq: sampling frequency of audio data + * @n_param: N value, depends on aud_samp_freq + * @intelhaddata: substream private data + * + * This function is called in the prepare callback. + * It programs based on the audio and display sampling frequency + */ +static int had_prog_n(u32 aud_samp_freq, u32 *n_param, + struct snd_intelhad *intelhaddata) +{ + int n_val; + + if (intelhaddata->dp_output) { + /* + * According to DP specs, Maud and Naud values hold + * a relationship, which is stated as: + * Maud/Naud = 512 * fs / f_LS_Clk + * where, fs is the sampling frequency of the audio stream + * and Naud is 32768 for Async clock. + */ + + n_val = DP_NAUD_VAL; + } else + n_val = had_calculate_n_value(aud_samp_freq); + + if (n_val < 0) + return n_val; + + had_write_register(intelhaddata, AUD_N_ENABLE, (BIT(24) | n_val)); + *n_param = n_val; + return 0; +} + +/* + * PCM ring buffer handling + * + * The hardware provides a ring buffer with the fixed 4 buffer descriptors + * (BDs). The driver maps these 4 BDs onto the PCM ring buffer. The mapping + * moves at each period elapsed. The below illustrates how it works: + * + * At time=0 + * PCM | 0 | 1 | 2 | 3 | 4 | 5 | .... |n-1| + * BD | 0 | 1 | 2 | 3 | + * + * At time=1 (period elapsed) + * PCM | 0 | 1 | 2 | 3 | 4 | 5 | .... |n-1| + * BD | 1 | 2 | 3 | 0 | + * + * At time=2 (second period elapsed) + * PCM | 0 | 1 | 2 | 3 | 4 | 5 | .... |n-1| + * BD | 2 | 3 | 0 | 1 | + * + * The bd_head field points to the index of the BD to be read. It's also the + * position to be filled at next. The pcm_head and the pcm_filled fields + * point to the indices of the current position and of the next position to + * be filled, respectively. For PCM buffer there are both _head and _filled + * because they may be difference when nperiods > 4. For example, in the + * example above at t=1, bd_head=1 and pcm_head=1 while pcm_filled=5: + * + * pcm_head (=1) --v v-- pcm_filled (=5) + * PCM | 0 | 1 | 2 | 3 | 4 | 5 | .... |n-1| + * BD | 1 | 2 | 3 | 0 | + * bd_head (=1) --^ ^-- next to fill (= bd_head) + * + * For nperiods < 4, the remaining BDs out of 4 are marked as invalid, so that + * the hardware skips those BDs in the loop. + * + * An exceptional setup is the case with nperiods=1. Since we have to update + * BDs after finishing one BD processing, we'd need at least two BDs, where + * both BDs point to the same content, the same address, the same size of the + * whole PCM buffer. + */ + +#define AUD_BUF_ADDR(x) (AUD_BUF_A_ADDR + (x) * HAD_REG_WIDTH) +#define AUD_BUF_LEN(x) (AUD_BUF_A_LENGTH + (x) * HAD_REG_WIDTH) + +/* Set up a buffer descriptor at the "filled" position */ +static void had_prog_bd(struct snd_pcm_substream *substream, + struct snd_intelhad *intelhaddata) +{ + int idx = intelhaddata->bd_head; + int ofs = intelhaddata->pcmbuf_filled * intelhaddata->period_bytes; + u32 addr = substream->runtime->dma_addr + ofs; + + addr |= AUD_BUF_VALID; + if (!substream->runtime->no_period_wakeup) + addr |= AUD_BUF_INTR_EN; + had_write_register(intelhaddata, AUD_BUF_ADDR(idx), addr); + had_write_register(intelhaddata, AUD_BUF_LEN(idx), + intelhaddata->period_bytes); + + /* advance the indices to the next */ + intelhaddata->bd_head++; + intelhaddata->bd_head %= intelhaddata->num_bds; + intelhaddata->pcmbuf_filled++; + intelhaddata->pcmbuf_filled %= substream->runtime->periods; +} + +/* invalidate a buffer descriptor with the given index */ +static void had_invalidate_bd(struct snd_intelhad *intelhaddata, + int idx) +{ + had_write_register(intelhaddata, AUD_BUF_ADDR(idx), 0); + had_write_register(intelhaddata, AUD_BUF_LEN(idx), 0); +} + +/* Initial programming of ring buffer */ +static void had_init_ringbuf(struct snd_pcm_substream *substream, + struct snd_intelhad *intelhaddata) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + int i, num_periods; + + num_periods = runtime->periods; + intelhaddata->num_bds = min(num_periods, HAD_NUM_OF_RING_BUFS); + /* set the minimum 2 BDs for num_periods=1 */ + intelhaddata->num_bds = max(intelhaddata->num_bds, 2U); + intelhaddata->period_bytes = + frames_to_bytes(runtime, runtime->period_size); + WARN_ON(intelhaddata->period_bytes & 0x3f); + + intelhaddata->bd_head = 0; + intelhaddata->pcmbuf_head = 0; + intelhaddata->pcmbuf_filled = 0; + + for (i = 0; i < HAD_NUM_OF_RING_BUFS; i++) { + if (i < intelhaddata->num_bds) + had_prog_bd(substream, intelhaddata); + else /* invalidate the rest */ + had_invalidate_bd(intelhaddata, i); + } + + intelhaddata->bd_head = 0; /* reset at head again before starting */ +} + +/* process a bd, advance to the next */ +static void had_advance_ringbuf(struct snd_pcm_substream *substream, + struct snd_intelhad *intelhaddata) +{ + int num_periods = substream->runtime->periods; + + /* reprogram the next buffer */ + had_prog_bd(substream, intelhaddata); + + /* proceed to next */ + intelhaddata->pcmbuf_head++; + intelhaddata->pcmbuf_head %= num_periods; +} + +/* process the current BD(s); + * returns the current PCM buffer byte position, or -EPIPE for underrun. + */ +static int had_process_ringbuf(struct snd_pcm_substream *substream, + struct snd_intelhad *intelhaddata) +{ + int len, processed; + unsigned long flags; + + processed = 0; + spin_lock_irqsave(&intelhaddata->had_spinlock, flags); + for (;;) { + /* get the remaining bytes on the buffer */ + had_read_register(intelhaddata, + AUD_BUF_LEN(intelhaddata->bd_head), + &len); + if (len < 0 || len > intelhaddata->period_bytes) { + dev_dbg(intelhaddata->dev, "Invalid buf length %d\n", + len); + len = -EPIPE; + goto out; + } + + if (len > 0) /* OK, this is the current buffer */ + break; + + /* len=0 => already empty, check the next buffer */ + if (++processed >= intelhaddata->num_bds) { + len = -EPIPE; /* all empty? - report underrun */ + goto out; + } + had_advance_ringbuf(substream, intelhaddata); + } + + len = intelhaddata->period_bytes - len; + len += intelhaddata->period_bytes * intelhaddata->pcmbuf_head; + out: + spin_unlock_irqrestore(&intelhaddata->had_spinlock, flags); + return len; +} + +/* called from irq handler */ +static void had_process_buffer_done(struct snd_intelhad *intelhaddata) +{ + struct snd_pcm_substream *substream; + + substream = had_substream_get(intelhaddata); + if (!substream) + return; /* no stream? - bail out */ + + if (!intelhaddata->connected) { + snd_pcm_stop_xrun(substream); + goto out; /* disconnected? - bail out */ + } + + /* process or stop the stream */ + if (had_process_ringbuf(substream, intelhaddata) < 0) + snd_pcm_stop_xrun(substream); + else + snd_pcm_period_elapsed(substream); + + out: + had_substream_put(intelhaddata); +} + +/* + * The interrupt status 'sticky' bits might not be cleared by + * setting '1' to that bit once... + */ +static void wait_clear_underrun_bit(struct snd_intelhad *intelhaddata) +{ + int i; + u32 val; + + for (i = 0; i < 100; i++) { + /* clear bit30, 31 AUD_HDMI_STATUS */ + had_read_register(intelhaddata, AUD_HDMI_STATUS, &val); + if (!(val & AUD_HDMI_STATUS_MASK_UNDERRUN)) + return; + udelay(100); + cond_resched(); + had_write_register(intelhaddata, AUD_HDMI_STATUS, val); + } + dev_err(intelhaddata->dev, "Unable to clear UNDERRUN bits\n"); +} + +/* Perform some reset procedure but only when need_reset is set; + * this is called from prepare or hw_free callbacks once after trigger STOP + * or underrun has been processed in order to settle down the h/w state. + */ +static void had_do_reset(struct snd_intelhad *intelhaddata) +{ + if (!intelhaddata->need_reset || !intelhaddata->connected) + return; + + /* Reset buffer pointers */ + had_reset_audio(intelhaddata); + wait_clear_underrun_bit(intelhaddata); + intelhaddata->need_reset = false; +} + +/* called from irq handler */ +static void had_process_buffer_underrun(struct snd_intelhad *intelhaddata) +{ + struct snd_pcm_substream *substream; + + /* Report UNDERRUN error to above layers */ + substream = had_substream_get(intelhaddata); + if (substream) { + snd_pcm_stop_xrun(substream); + had_substream_put(intelhaddata); + } + intelhaddata->need_reset = true; +} + +/* + * ALSA PCM open callback + */ +static int had_pcm_open(struct snd_pcm_substream *substream) +{ + struct snd_intelhad *intelhaddata; + struct snd_pcm_runtime *runtime; + int retval; + + intelhaddata = snd_pcm_substream_chip(substream); + runtime = substream->runtime; + + pm_runtime_get_sync(intelhaddata->dev); + + /* set the runtime hw parameter with local snd_pcm_hardware struct */ + runtime->hw = had_pcm_hardware; + + retval = snd_pcm_hw_constraint_integer(runtime, + SNDRV_PCM_HW_PARAM_PERIODS); + if (retval < 0) + goto error; + + /* Make sure, that the period size is always aligned + * 64byte boundary + */ + retval = snd_pcm_hw_constraint_step(substream->runtime, 0, + SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 64); + if (retval < 0) + goto error; + + retval = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24); + if (retval < 0) + goto error; + + /* expose PCM substream */ + spin_lock_irq(&intelhaddata->had_spinlock); + intelhaddata->stream_info.substream = substream; + intelhaddata->stream_info.substream_refcount++; + spin_unlock_irq(&intelhaddata->had_spinlock); + + return retval; + error: + pm_runtime_mark_last_busy(intelhaddata->dev); + pm_runtime_put_autosuspend(intelhaddata->dev); + return retval; +} + +/* + * ALSA PCM close callback + */ +static int had_pcm_close(struct snd_pcm_substream *substream) +{ + struct snd_intelhad *intelhaddata; + + intelhaddata = snd_pcm_substream_chip(substream); + + /* unreference and sync with the pending PCM accesses */ + spin_lock_irq(&intelhaddata->had_spinlock); + intelhaddata->stream_info.substream = NULL; + intelhaddata->stream_info.substream_refcount--; + while (intelhaddata->stream_info.substream_refcount > 0) { + spin_unlock_irq(&intelhaddata->had_spinlock); + cpu_relax(); + spin_lock_irq(&intelhaddata->had_spinlock); + } + spin_unlock_irq(&intelhaddata->had_spinlock); + + pm_runtime_mark_last_busy(intelhaddata->dev); + pm_runtime_put_autosuspend(intelhaddata->dev); + return 0; +} + +/* + * ALSA PCM hw_params callback + */ +static int had_pcm_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *hw_params) +{ + struct snd_intelhad *intelhaddata; + unsigned long addr; + int pages, buf_size, retval; + + intelhaddata = snd_pcm_substream_chip(substream); + buf_size = params_buffer_bytes(hw_params); + retval = snd_pcm_lib_malloc_pages(substream, buf_size); + if (retval < 0) + return retval; + dev_dbg(intelhaddata->dev, "%s:allocated memory = %d\n", + __func__, buf_size); + /* mark the pages as uncached region */ + addr = (unsigned long) substream->runtime->dma_area; + pages = (substream->runtime->dma_bytes + PAGE_SIZE - 1) / PAGE_SIZE; + retval = set_memory_uc(addr, pages); + if (retval) { + dev_err(intelhaddata->dev, "set_memory_uc failed.Error:%d\n", + retval); + return retval; + } + memset(substream->runtime->dma_area, 0, buf_size); + + return retval; +} + +/* + * ALSA PCM hw_free callback + */ +static int had_pcm_hw_free(struct snd_pcm_substream *substream) +{ + struct snd_intelhad *intelhaddata; + unsigned long addr; + u32 pages; + + intelhaddata = snd_pcm_substream_chip(substream); + had_do_reset(intelhaddata); + + /* mark back the pages as cached/writeback region before the free */ + if (substream->runtime->dma_area != NULL) { + addr = (unsigned long) substream->runtime->dma_area; + pages = (substream->runtime->dma_bytes + PAGE_SIZE - 1) / + PAGE_SIZE; + set_memory_wb(addr, pages); + return snd_pcm_lib_free_pages(substream); + } + return 0; +} + +/* + * ALSA PCM trigger callback + */ +static int had_pcm_trigger(struct snd_pcm_substream *substream, int cmd) +{ + int retval = 0; + struct snd_intelhad *intelhaddata; + + intelhaddata = snd_pcm_substream_chip(substream); + + spin_lock(&intelhaddata->had_spinlock); + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: + case SNDRV_PCM_TRIGGER_RESUME: + /* Enable Audio */ + had_ack_irqs(intelhaddata); /* FIXME: do we need this? */ + had_enable_audio(intelhaddata, true); + break; + + case SNDRV_PCM_TRIGGER_STOP: + case SNDRV_PCM_TRIGGER_PAUSE_PUSH: + /* Disable Audio */ + had_enable_audio(intelhaddata, false); + intelhaddata->need_reset = true; + break; + + default: + retval = -EINVAL; + } + spin_unlock(&intelhaddata->had_spinlock); + return retval; +} + +/* + * ALSA PCM prepare callback + */ +static int had_pcm_prepare(struct snd_pcm_substream *substream) +{ + int retval; + u32 disp_samp_freq, n_param; + u32 link_rate = 0; + struct snd_intelhad *intelhaddata; + struct snd_pcm_runtime *runtime; + + intelhaddata = snd_pcm_substream_chip(substream); + runtime = substream->runtime; + + dev_dbg(intelhaddata->dev, "period_size=%d\n", + (int)frames_to_bytes(runtime, runtime->period_size)); + dev_dbg(intelhaddata->dev, "periods=%d\n", runtime->periods); + dev_dbg(intelhaddata->dev, "buffer_size=%d\n", + (int)snd_pcm_lib_buffer_bytes(substream)); + dev_dbg(intelhaddata->dev, "rate=%d\n", runtime->rate); + dev_dbg(intelhaddata->dev, "channels=%d\n", runtime->channels); + + had_do_reset(intelhaddata); + + /* Get N value in KHz */ + disp_samp_freq = intelhaddata->tmds_clock_speed; + + retval = had_prog_n(substream->runtime->rate, &n_param, intelhaddata); + if (retval) { + dev_err(intelhaddata->dev, + "programming N value failed %#x\n", retval); + goto prep_end; + } + + if (intelhaddata->dp_output) + link_rate = intelhaddata->link_rate; + + had_prog_cts(substream->runtime->rate, disp_samp_freq, link_rate, + n_param, intelhaddata); + + had_prog_dip(substream, intelhaddata); + + retval = had_init_audio_ctrl(substream, intelhaddata); + + /* Prog buffer address */ + had_init_ringbuf(substream, intelhaddata); + + /* + * Program channel mapping in following order: + * FL, FR, C, LFE, RL, RR + */ + + had_write_register(intelhaddata, AUD_BUF_CH_SWAP, SWAP_LFE_CENTER); + +prep_end: + return retval; +} + +/* + * ALSA PCM pointer callback + */ +static snd_pcm_uframes_t had_pcm_pointer(struct snd_pcm_substream *substream) +{ + struct snd_intelhad *intelhaddata; + int len; + + intelhaddata = snd_pcm_substream_chip(substream); + + if (!intelhaddata->connected) + return SNDRV_PCM_POS_XRUN; + + len = had_process_ringbuf(substream, intelhaddata); + if (len < 0) + return SNDRV_PCM_POS_XRUN; + len = bytes_to_frames(substream->runtime, len); + /* wrapping may happen when periods=1 */ + len %= substream->runtime->buffer_size; + return len; +} + +/* + * ALSA PCM mmap callback + */ +static int had_pcm_mmap(struct snd_pcm_substream *substream, + struct vm_area_struct *vma) +{ + vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); + return remap_pfn_range(vma, vma->vm_start, + substream->runtime->dma_addr >> PAGE_SHIFT, + vma->vm_end - vma->vm_start, vma->vm_page_prot); +} + +/* + * ALSA PCM ops + */ +static const struct snd_pcm_ops had_pcm_ops = { + .open = had_pcm_open, + .close = had_pcm_close, + .ioctl = snd_pcm_lib_ioctl, + .hw_params = had_pcm_hw_params, + .hw_free = had_pcm_hw_free, + .prepare = had_pcm_prepare, + .trigger = had_pcm_trigger, + .pointer = had_pcm_pointer, + .mmap = had_pcm_mmap, +}; + +/* process mode change of the running stream; called in mutex */ +static int had_process_mode_change(struct snd_intelhad *intelhaddata) +{ + struct snd_pcm_substream *substream; + int retval = 0; + u32 disp_samp_freq, n_param; + u32 link_rate = 0; + + substream = had_substream_get(intelhaddata); + if (!substream) + return 0; + + /* Disable Audio */ + had_enable_audio(intelhaddata, false); + + /* Update CTS value */ + disp_samp_freq = intelhaddata->tmds_clock_speed; + + retval = had_prog_n(substream->runtime->rate, &n_param, intelhaddata); + if (retval) { + dev_err(intelhaddata->dev, + "programming N value failed %#x\n", retval); + goto out; + } + + if (intelhaddata->dp_output) + link_rate = intelhaddata->link_rate; + + had_prog_cts(substream->runtime->rate, disp_samp_freq, link_rate, + n_param, intelhaddata); + + /* Enable Audio */ + had_enable_audio(intelhaddata, true); + +out: + had_substream_put(intelhaddata); + return retval; +} + +/* process hot plug, called from wq with mutex locked */ +static void had_process_hot_plug(struct snd_intelhad *intelhaddata) +{ + struct snd_pcm_substream *substream; + + spin_lock_irq(&intelhaddata->had_spinlock); + if (intelhaddata->connected) { + dev_dbg(intelhaddata->dev, "Device already connected\n"); + spin_unlock_irq(&intelhaddata->had_spinlock); + return; + } + + /* Disable Audio */ + had_enable_audio(intelhaddata, false); + + intelhaddata->connected = true; + dev_dbg(intelhaddata->dev, + "%s @ %d:DEBUG PLUG/UNPLUG : HAD_DRV_CONNECTED\n", + __func__, __LINE__); + spin_unlock_irq(&intelhaddata->had_spinlock); + + had_build_channel_allocation_map(intelhaddata); + + /* Report to above ALSA layer */ + substream = had_substream_get(intelhaddata); + if (substream) { + snd_pcm_stop_xrun(substream); + had_substream_put(intelhaddata); + } + + snd_jack_report(intelhaddata->jack, SND_JACK_AVOUT); +} + +/* process hot unplug, called from wq with mutex locked */ +static void had_process_hot_unplug(struct snd_intelhad *intelhaddata) +{ + struct snd_pcm_substream *substream; + + spin_lock_irq(&intelhaddata->had_spinlock); + if (!intelhaddata->connected) { + dev_dbg(intelhaddata->dev, "Device already disconnected\n"); + spin_unlock_irq(&intelhaddata->had_spinlock); + return; + + } + + /* Disable Audio */ + had_enable_audio(intelhaddata, false); + + intelhaddata->connected = false; + dev_dbg(intelhaddata->dev, + "%s @ %d:DEBUG PLUG/UNPLUG : HAD_DRV_DISCONNECTED\n", + __func__, __LINE__); + spin_unlock_irq(&intelhaddata->had_spinlock); + + kfree(intelhaddata->chmap->chmap); + intelhaddata->chmap->chmap = NULL; + + /* Report to above ALSA layer */ + substream = had_substream_get(intelhaddata); + if (substream) { + snd_pcm_stop_xrun(substream); + had_substream_put(intelhaddata); + } + + snd_jack_report(intelhaddata->jack, 0); +} + +/* + * ALSA iec958 and ELD controls + */ + +static int had_iec958_info(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_info *uinfo) +{ + uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958; + uinfo->count = 1; + return 0; +} + +static int had_iec958_get(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct snd_intelhad *intelhaddata = snd_kcontrol_chip(kcontrol); + + mutex_lock(&intelhaddata->mutex); + ucontrol->value.iec958.status[0] = (intelhaddata->aes_bits >> 0) & 0xff; + ucontrol->value.iec958.status[1] = (intelhaddata->aes_bits >> 8) & 0xff; + ucontrol->value.iec958.status[2] = + (intelhaddata->aes_bits >> 16) & 0xff; + ucontrol->value.iec958.status[3] = + (intelhaddata->aes_bits >> 24) & 0xff; + mutex_unlock(&intelhaddata->mutex); + return 0; +} + +static int had_iec958_mask_get(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + ucontrol->value.iec958.status[0] = 0xff; + ucontrol->value.iec958.status[1] = 0xff; + ucontrol->value.iec958.status[2] = 0xff; + ucontrol->value.iec958.status[3] = 0xff; + return 0; +} + +static int had_iec958_put(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + unsigned int val; + struct snd_intelhad *intelhaddata = snd_kcontrol_chip(kcontrol); + int changed = 0; + + val = (ucontrol->value.iec958.status[0] << 0) | + (ucontrol->value.iec958.status[1] << 8) | + (ucontrol->value.iec958.status[2] << 16) | + (ucontrol->value.iec958.status[3] << 24); + mutex_lock(&intelhaddata->mutex); + if (intelhaddata->aes_bits != val) { + intelhaddata->aes_bits = val; + changed = 1; + } + mutex_unlock(&intelhaddata->mutex); + return changed; +} + +static int had_ctl_eld_info(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_info *uinfo) +{ + uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES; + uinfo->count = HDMI_MAX_ELD_BYTES; + return 0; +} + +static int had_ctl_eld_get(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct snd_intelhad *intelhaddata = snd_kcontrol_chip(kcontrol); + + mutex_lock(&intelhaddata->mutex); + memcpy(ucontrol->value.bytes.data, intelhaddata->eld, + HDMI_MAX_ELD_BYTES); + mutex_unlock(&intelhaddata->mutex); + return 0; +} + +static const struct snd_kcontrol_new had_controls[] = { + { + .access = SNDRV_CTL_ELEM_ACCESS_READ, + .iface = SNDRV_CTL_ELEM_IFACE_PCM, + .name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, MASK), + .info = had_iec958_info, /* shared */ + .get = had_iec958_mask_get, + }, + { + .iface = SNDRV_CTL_ELEM_IFACE_PCM, + .name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, DEFAULT), + .info = had_iec958_info, + .get = had_iec958_get, + .put = had_iec958_put, + }, + { + .access = (SNDRV_CTL_ELEM_ACCESS_READ | + SNDRV_CTL_ELEM_ACCESS_VOLATILE), + .iface = SNDRV_CTL_ELEM_IFACE_PCM, + .name = "ELD", + .info = had_ctl_eld_info, + .get = had_ctl_eld_get, + }, +}; + +/* + * audio interrupt handler + */ +static irqreturn_t display_pipe_interrupt_handler(int irq, void *dev_id) +{ + struct snd_intelhad_card *card_ctx = dev_id; + u32 audio_stat[3] = {}; + int pipe, port; + + for_each_pipe(card_ctx, pipe) { + /* use raw register access to ack IRQs even while disconnected */ + audio_stat[pipe] = had_read_register_raw(card_ctx, pipe, + AUD_HDMI_STATUS) & + (HDMI_AUDIO_UNDERRUN | HDMI_AUDIO_BUFFER_DONE); + + if (audio_stat[pipe]) + had_write_register_raw(card_ctx, pipe, + AUD_HDMI_STATUS, audio_stat[pipe]); + } + + for_each_port(card_ctx, port) { + struct snd_intelhad *ctx = &card_ctx->pcm_ctx[port]; + int pipe = ctx->pipe; + + if (pipe < 0) + continue; + + if (audio_stat[pipe] & HDMI_AUDIO_BUFFER_DONE) + had_process_buffer_done(ctx); + if (audio_stat[pipe] & HDMI_AUDIO_UNDERRUN) + had_process_buffer_underrun(ctx); + } + + return IRQ_HANDLED; +} + +/* + * monitor plug/unplug notification from i915; just kick off the work + */ +static void notify_audio_lpe(struct platform_device *pdev, int port) +{ + struct snd_intelhad_card *card_ctx = platform_get_drvdata(pdev); + struct snd_intelhad *ctx; + + ctx = &card_ctx->pcm_ctx[single_port ? 0 : port]; + if (single_port) + ctx->port = port; + + schedule_work(&ctx->hdmi_audio_wq); +} + +/* the work to handle monitor hot plug/unplug */ +static void had_audio_wq(struct work_struct *work) +{ + struct snd_intelhad *ctx = + container_of(work, struct snd_intelhad, hdmi_audio_wq); + struct intel_hdmi_lpe_audio_pdata *pdata = ctx->dev->platform_data; + struct intel_hdmi_lpe_audio_port_pdata *ppdata = &pdata->port[ctx->port]; + + pm_runtime_get_sync(ctx->dev); + mutex_lock(&ctx->mutex); + if (ppdata->pipe < 0) { + dev_dbg(ctx->dev, "%s: Event: HAD_NOTIFY_HOT_UNPLUG : port = %d\n", + __func__, ctx->port); + + memset(ctx->eld, 0, sizeof(ctx->eld)); /* clear the old ELD */ + + ctx->dp_output = false; + ctx->tmds_clock_speed = 0; + ctx->link_rate = 0; + + /* Shut down the stream */ + had_process_hot_unplug(ctx); + + ctx->pipe = -1; + } else { + dev_dbg(ctx->dev, "%s: HAD_NOTIFY_ELD : port = %d, tmds = %d\n", + __func__, ctx->port, ppdata->ls_clock); + + memcpy(ctx->eld, ppdata->eld, sizeof(ctx->eld)); + + ctx->dp_output = ppdata->dp_output; + if (ctx->dp_output) { + ctx->tmds_clock_speed = 0; + ctx->link_rate = ppdata->ls_clock; + } else { + ctx->tmds_clock_speed = ppdata->ls_clock; + ctx->link_rate = 0; + } + + /* + * Shut down the stream before we change + * the pipe assignment for this pcm device + */ + had_process_hot_plug(ctx); + + ctx->pipe = ppdata->pipe; + + /* Restart the stream if necessary */ + had_process_mode_change(ctx); + } + + mutex_unlock(&ctx->mutex); + pm_runtime_mark_last_busy(ctx->dev); + pm_runtime_put_autosuspend(ctx->dev); +} + +/* + * Jack interface + */ +static int had_create_jack(struct snd_intelhad *ctx, + struct snd_pcm *pcm) +{ + char hdmi_str[32]; + int err; + + snprintf(hdmi_str, sizeof(hdmi_str), + "HDMI/DP,pcm=%d", pcm->device); + + err = snd_jack_new(ctx->card_ctx->card, hdmi_str, + SND_JACK_AVOUT, &ctx->jack, + true, false); + if (err < 0) + return err; + ctx->jack->private_data = ctx; + return 0; +} + +/* + * PM callbacks + */ + +static int hdmi_lpe_audio_runtime_suspend(struct device *dev) +{ + struct snd_intelhad_card *card_ctx = dev_get_drvdata(dev); + int port; + + for_each_port(card_ctx, port) { + struct snd_intelhad *ctx = &card_ctx->pcm_ctx[port]; + struct snd_pcm_substream *substream; + + substream = had_substream_get(ctx); + if (substream) { + snd_pcm_suspend(substream); + had_substream_put(ctx); + } + } + + return 0; +} + +static int __maybe_unused hdmi_lpe_audio_suspend(struct device *dev) +{ + struct snd_intelhad_card *card_ctx = dev_get_drvdata(dev); + int err; + + err = hdmi_lpe_audio_runtime_suspend(dev); + if (!err) + snd_power_change_state(card_ctx->card, SNDRV_CTL_POWER_D3hot); + return err; +} + +static int hdmi_lpe_audio_runtime_resume(struct device *dev) +{ + pm_runtime_mark_last_busy(dev); + return 0; +} + +static int __maybe_unused hdmi_lpe_audio_resume(struct device *dev) +{ + struct snd_intelhad_card *card_ctx = dev_get_drvdata(dev); + + hdmi_lpe_audio_runtime_resume(dev); + snd_power_change_state(card_ctx->card, SNDRV_CTL_POWER_D0); + return 0; +} + +/* release resources */ +static void hdmi_lpe_audio_free(struct snd_card *card) +{ + struct snd_intelhad_card *card_ctx = card->private_data; + struct intel_hdmi_lpe_audio_pdata *pdata = card_ctx->dev->platform_data; + int port; + + spin_lock_irq(&pdata->lpe_audio_slock); + pdata->notify_audio_lpe = NULL; + spin_unlock_irq(&pdata->lpe_audio_slock); + + for_each_port(card_ctx, port) { + struct snd_intelhad *ctx = &card_ctx->pcm_ctx[port]; + + cancel_work_sync(&ctx->hdmi_audio_wq); + } + + if (card_ctx->mmio_start) + iounmap(card_ctx->mmio_start); + if (card_ctx->irq >= 0) + free_irq(card_ctx->irq, card_ctx); +} + +/* + * hdmi_lpe_audio_probe - start bridge with i915 + * + * This function is called when the i915 driver creates the + * hdmi-lpe-audio platform device. + */ +static int hdmi_lpe_audio_probe(struct platform_device *pdev) +{ + struct snd_card *card; + struct snd_intelhad_card *card_ctx; + struct snd_intelhad *ctx; + struct snd_pcm *pcm; + struct intel_hdmi_lpe_audio_pdata *pdata; + int irq; + struct resource *res_mmio; + int port, ret; + + pdata = pdev->dev.platform_data; + if (!pdata) { + dev_err(&pdev->dev, "%s: quit: pdata not allocated by i915!!\n", __func__); + return -EINVAL; + } + + /* get resources */ + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_err(&pdev->dev, "Could not get irq resource: %d\n", irq); + return irq; + } + + res_mmio = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res_mmio) { + dev_err(&pdev->dev, "Could not get IO_MEM resources\n"); + return -ENXIO; + } + + /* create a card instance with ALSA framework */ + ret = snd_card_new(&pdev->dev, hdmi_card_index, hdmi_card_id, + THIS_MODULE, sizeof(*card_ctx), &card); + if (ret) + return ret; + + card_ctx = card->private_data; + card_ctx->dev = &pdev->dev; + card_ctx->card = card; + strcpy(card->driver, INTEL_HAD); + strcpy(card->shortname, "Intel HDMI/DP LPE Audio"); + strcpy(card->longname, "Intel HDMI/DP LPE Audio"); + + card_ctx->irq = -1; + + card->private_free = hdmi_lpe_audio_free; + + platform_set_drvdata(pdev, card_ctx); + + card_ctx->num_pipes = pdata->num_pipes; + card_ctx->num_ports = single_port ? 1 : pdata->num_ports; + + for_each_port(card_ctx, port) { + ctx = &card_ctx->pcm_ctx[port]; + ctx->card_ctx = card_ctx; + ctx->dev = card_ctx->dev; + ctx->port = single_port ? -1 : port; + ctx->pipe = -1; + + spin_lock_init(&ctx->had_spinlock); + mutex_init(&ctx->mutex); + INIT_WORK(&ctx->hdmi_audio_wq, had_audio_wq); + } + + dev_dbg(&pdev->dev, "%s: mmio_start = 0x%x, mmio_end = 0x%x\n", + __func__, (unsigned int)res_mmio->start, + (unsigned int)res_mmio->end); + + card_ctx->mmio_start = ioremap_nocache(res_mmio->start, + (size_t)(resource_size(res_mmio))); + if (!card_ctx->mmio_start) { + dev_err(&pdev->dev, "Could not get ioremap\n"); + ret = -EACCES; + goto err; + } + + /* setup interrupt handler */ + ret = request_irq(irq, display_pipe_interrupt_handler, 0, + pdev->name, card_ctx); + if (ret < 0) { + dev_err(&pdev->dev, "request_irq failed\n"); + goto err; + } + + card_ctx->irq = irq; + + /* only 32bit addressable */ + dma_set_mask(&pdev->dev, DMA_BIT_MASK(32)); + dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32)); + + init_channel_allocations(); + + card_ctx->num_pipes = pdata->num_pipes; + card_ctx->num_ports = single_port ? 1 : pdata->num_ports; + + for_each_port(card_ctx, port) { + int i; + + ctx = &card_ctx->pcm_ctx[port]; + ret = snd_pcm_new(card, INTEL_HAD, port, MAX_PB_STREAMS, + MAX_CAP_STREAMS, &pcm); + if (ret) + goto err; + + /* setup private data which can be retrieved when required */ + pcm->private_data = ctx; + pcm->info_flags = 0; + strlcpy(pcm->name, card->shortname, strlen(card->shortname)); + /* setup the ops for playabck */ + snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &had_pcm_ops); + + /* allocate dma pages; + * try to allocate 600k buffer as default which is large enough + */ + snd_pcm_lib_preallocate_pages_for_all(pcm, + SNDRV_DMA_TYPE_DEV, NULL, + HAD_DEFAULT_BUFFER, HAD_MAX_BUFFER); + + /* create controls */ + for (i = 0; i < ARRAY_SIZE(had_controls); i++) { + struct snd_kcontrol *kctl; + + kctl = snd_ctl_new1(&had_controls[i], ctx); + if (!kctl) { + ret = -ENOMEM; + goto err; + } + + kctl->id.device = pcm->device; + + ret = snd_ctl_add(card, kctl); + if (ret < 0) + goto err; + } + + /* Register channel map controls */ + ret = had_register_chmap_ctls(ctx, pcm); + if (ret < 0) + goto err; + + ret = had_create_jack(ctx, pcm); + if (ret < 0) + goto err; + } + + ret = snd_card_register(card); + if (ret) + goto err; + + spin_lock_irq(&pdata->lpe_audio_slock); + pdata->notify_audio_lpe = notify_audio_lpe; + spin_unlock_irq(&pdata->lpe_audio_slock); + + pm_runtime_use_autosuspend(&pdev->dev); + pm_runtime_mark_last_busy(&pdev->dev); + + dev_dbg(&pdev->dev, "%s: handle pending notification\n", __func__); + for_each_port(card_ctx, port) { + struct snd_intelhad *ctx = &card_ctx->pcm_ctx[port]; + + schedule_work(&ctx->hdmi_audio_wq); + } + + return 0; + +err: + snd_card_free(card); + return ret; +} + +/* + * hdmi_lpe_audio_remove - stop bridge with i915 + * + * This function is called when the platform device is destroyed. + */ +static int hdmi_lpe_audio_remove(struct platform_device *pdev) +{ + struct snd_intelhad_card *card_ctx = platform_get_drvdata(pdev); + + snd_card_free(card_ctx->card); + return 0; +} + +static const struct dev_pm_ops hdmi_lpe_audio_pm = { + SET_SYSTEM_SLEEP_PM_OPS(hdmi_lpe_audio_suspend, hdmi_lpe_audio_resume) + SET_RUNTIME_PM_OPS(hdmi_lpe_audio_runtime_suspend, + hdmi_lpe_audio_runtime_resume, NULL) +}; + +static struct platform_driver hdmi_lpe_audio_driver = { + .driver = { + .name = "hdmi-lpe-audio", + .pm = &hdmi_lpe_audio_pm, + }, + .probe = hdmi_lpe_audio_probe, + .remove = hdmi_lpe_audio_remove, +}; + +module_platform_driver(hdmi_lpe_audio_driver); +MODULE_ALIAS("platform:hdmi_lpe_audio"); + +MODULE_AUTHOR("Sailaja Bandarupalli <sailaja.bandarupalli@intel.com>"); +MODULE_AUTHOR("Ramesh Babu K V <ramesh.babu@intel.com>"); +MODULE_AUTHOR("Vaibhav Agarwal <vaibhav.agarwal@intel.com>"); +MODULE_AUTHOR("Jerome Anand <jerome.anand@intel.com>"); +MODULE_DESCRIPTION("Intel HDMI Audio driver"); +MODULE_LICENSE("GPL v2"); +MODULE_SUPPORTED_DEVICE("{Intel,Intel_HAD}"); |