--- /dev/null
+/*
+ * Copyright (C) 2013 Red Hat
+ * Author: Rob Clark <robdclark@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/hdmi.h>
+#include "hdmi.h"
+
+
+/* Supported HDMI Audio channels */
+#define MSM_HDMI_AUDIO_CHANNEL_2 0
+#define MSM_HDMI_AUDIO_CHANNEL_4 1
+#define MSM_HDMI_AUDIO_CHANNEL_6 2
+#define MSM_HDMI_AUDIO_CHANNEL_8 3
+
+/* maps MSM_HDMI_AUDIO_CHANNEL_n consts used by audio driver to # of channels: */
+static int nchannels[] = { 2, 4, 6, 8 };
+
+/* Supported HDMI Audio sample rates */
+#define MSM_HDMI_SAMPLE_RATE_32KHZ 0
+#define MSM_HDMI_SAMPLE_RATE_44_1KHZ 1
+#define MSM_HDMI_SAMPLE_RATE_48KHZ 2
+#define MSM_HDMI_SAMPLE_RATE_88_2KHZ 3
+#define MSM_HDMI_SAMPLE_RATE_96KHZ 4
+#define MSM_HDMI_SAMPLE_RATE_176_4KHZ 5
+#define MSM_HDMI_SAMPLE_RATE_192KHZ 6
+#define MSM_HDMI_SAMPLE_RATE_MAX 7
+
+
+struct hdmi_msm_audio_acr {
+ uint32_t n; /* N parameter for clock regeneration */
+ uint32_t cts; /* CTS parameter for clock regeneration */
+};
+
+struct hdmi_msm_audio_arcs {
+ unsigned long int pixclock;
+ struct hdmi_msm_audio_acr lut[MSM_HDMI_SAMPLE_RATE_MAX];
+};
+
+#define HDMI_MSM_AUDIO_ARCS(pclk, ...) { (1000 * (pclk)), __VA_ARGS__ }
+
+/* Audio constants lookup table for hdmi_msm_audio_acr_setup */
+/* Valid Pixel-Clock rates: 25.2MHz, 27MHz, 27.03MHz, 74.25MHz, 148.5MHz */
+static const struct hdmi_msm_audio_arcs acr_lut[] = {
+ /* 25.200MHz */
+ HDMI_MSM_AUDIO_ARCS(25200, {
+ {4096, 25200}, {6272, 28000}, {6144, 25200}, {12544, 28000},
+ {12288, 25200}, {25088, 28000}, {24576, 25200} }),
+ /* 27.000MHz */
+ HDMI_MSM_AUDIO_ARCS(27000, {
+ {4096, 27000}, {6272, 30000}, {6144, 27000}, {12544, 30000},
+ {12288, 27000}, {25088, 30000}, {24576, 27000} }),
+ /* 27.027MHz */
+ HDMI_MSM_AUDIO_ARCS(27030, {
+ {4096, 27027}, {6272, 30030}, {6144, 27027}, {12544, 30030},
+ {12288, 27027}, {25088, 30030}, {24576, 27027} }),
+ /* 74.250MHz */
+ HDMI_MSM_AUDIO_ARCS(74250, {
+ {4096, 74250}, {6272, 82500}, {6144, 74250}, {12544, 82500},
+ {12288, 74250}, {25088, 82500}, {24576, 74250} }),
+ /* 148.500MHz */
+ HDMI_MSM_AUDIO_ARCS(148500, {
+ {4096, 148500}, {6272, 165000}, {6144, 148500}, {12544, 165000},
+ {12288, 148500}, {25088, 165000}, {24576, 148500} }),
+};
+
+static const struct hdmi_msm_audio_arcs *get_arcs(unsigned long int pixclock)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(acr_lut); i++) {
+ const struct hdmi_msm_audio_arcs *arcs = &acr_lut[i];
+ if (arcs->pixclock == pixclock)
+ return arcs;
+ }
+
+ return NULL;
+}
+
+int hdmi_audio_update(struct hdmi *hdmi)
+{
+ struct hdmi_audio *audio = &hdmi->audio;
+ struct hdmi_audio_infoframe *info = &audio->infoframe;
+ const struct hdmi_msm_audio_arcs *arcs = NULL;
+ bool enabled = audio->enabled;
+ uint32_t acr_pkt_ctrl, vbi_pkt_ctrl, aud_pkt_ctrl;
+ uint32_t infofrm_ctrl, audio_config;
+
+ DBG("audio: enabled=%d, channels=%d, channel_allocation=0x%x, "
+ "level_shift_value=%d, downmix_inhibit=%d, rate=%d",
+ audio->enabled, info->channels, info->channel_allocation,
+ info->level_shift_value, info->downmix_inhibit, audio->rate);
+ DBG("video: power_on=%d, pixclock=%lu", hdmi->power_on, hdmi->pixclock);
+
+ if (enabled && !(hdmi->power_on && hdmi->pixclock)) {
+ DBG("disabling audio: no video");
+ enabled = false;
+ }
+
+ if (enabled) {
+ arcs = get_arcs(hdmi->pixclock);
+ if (!arcs) {
+ DBG("disabling audio: unsupported pixclock: %lu",
+ hdmi->pixclock);
+ enabled = false;
+ }
+ }
+
+ /* Read first before writing */
+ acr_pkt_ctrl = hdmi_read(hdmi, REG_HDMI_ACR_PKT_CTRL);
+ vbi_pkt_ctrl = hdmi_read(hdmi, REG_HDMI_VBI_PKT_CTRL);
+ aud_pkt_ctrl = hdmi_read(hdmi, REG_HDMI_AUDIO_PKT_CTRL1);
+ infofrm_ctrl = hdmi_read(hdmi, REG_HDMI_INFOFRAME_CTRL0);
+ audio_config = hdmi_read(hdmi, REG_HDMI_AUDIO_CFG);
+
+ /* Clear N/CTS selection bits */
+ acr_pkt_ctrl &= ~HDMI_ACR_PKT_CTRL_SELECT__MASK;
+
+ if (enabled) {
+ uint32_t n, cts, multiplier;
+ enum hdmi_acr_cts select;
+ uint8_t buf[14];
+
+ n = arcs->lut[audio->rate].n;
+ cts = arcs->lut[audio->rate].cts;
+
+ if ((MSM_HDMI_SAMPLE_RATE_192KHZ == audio->rate) ||
+ (MSM_HDMI_SAMPLE_RATE_176_4KHZ == audio->rate)) {
+ multiplier = 4;
+ n >>= 2; /* divide N by 4 and use multiplier */
+ } else if ((MSM_HDMI_SAMPLE_RATE_96KHZ == audio->rate) ||
+ (MSM_HDMI_SAMPLE_RATE_88_2KHZ == audio->rate)) {
+ multiplier = 2;
+ n >>= 1; /* divide N by 2 and use multiplier */
+ } else {
+ multiplier = 1;
+ }
+
+ DBG("n=%u, cts=%u, multiplier=%u", n, cts, multiplier);
+
+ acr_pkt_ctrl |= HDMI_ACR_PKT_CTRL_SOURCE;
+ acr_pkt_ctrl |= HDMI_ACR_PKT_CTRL_AUDIO_PRIORITY;
+ acr_pkt_ctrl |= HDMI_ACR_PKT_CTRL_N_MULTIPLIER(multiplier);
+
+ if ((MSM_HDMI_SAMPLE_RATE_48KHZ == audio->rate) ||
+ (MSM_HDMI_SAMPLE_RATE_96KHZ == audio->rate) ||
+ (MSM_HDMI_SAMPLE_RATE_192KHZ == audio->rate))
+ select = ACR_48;
+ else if ((MSM_HDMI_SAMPLE_RATE_44_1KHZ == audio->rate) ||
+ (MSM_HDMI_SAMPLE_RATE_88_2KHZ == audio->rate) ||
+ (MSM_HDMI_SAMPLE_RATE_176_4KHZ == audio->rate))
+ select = ACR_44;
+ else /* default to 32k */
+ select = ACR_32;
+
+ acr_pkt_ctrl |= HDMI_ACR_PKT_CTRL_SELECT(select);
+
+ hdmi_write(hdmi, REG_HDMI_ACR_0(select - 1),
+ HDMI_ACR_0_CTS(cts));
+ hdmi_write(hdmi, REG_HDMI_ACR_1(select - 1),
+ HDMI_ACR_1_N(n));
+
+ hdmi_write(hdmi, REG_HDMI_AUDIO_PKT_CTRL2,
+ COND(info->channels != 2, HDMI_AUDIO_PKT_CTRL2_LAYOUT) |
+ HDMI_AUDIO_PKT_CTRL2_OVERRIDE);
+
+ acr_pkt_ctrl |= HDMI_ACR_PKT_CTRL_CONT;
+ acr_pkt_ctrl |= HDMI_ACR_PKT_CTRL_SEND;
+
+ /* configure infoframe: */
+ hdmi_audio_infoframe_pack(info, buf, sizeof(buf));
+ hdmi_write(hdmi, REG_HDMI_AUDIO_INFO0,
+ (buf[3] << 0) || (buf[4] << 8) ||
+ (buf[5] << 16) || (buf[6] << 24));
+ hdmi_write(hdmi, REG_HDMI_AUDIO_INFO1,
+ (buf[7] << 0) || (buf[8] << 8));
+
+ hdmi_write(hdmi, REG_HDMI_GC, 0);
+
+ vbi_pkt_ctrl |= HDMI_VBI_PKT_CTRL_GC_ENABLE;
+ vbi_pkt_ctrl |= HDMI_VBI_PKT_CTRL_GC_EVERY_FRAME;
+
+ aud_pkt_ctrl |= HDMI_AUDIO_PKT_CTRL1_AUDIO_SAMPLE_SEND;
+
+ infofrm_ctrl |= HDMI_INFOFRAME_CTRL0_AUDIO_INFO_SEND;
+ infofrm_ctrl |= HDMI_INFOFRAME_CTRL0_AUDIO_INFO_CONT;
+ infofrm_ctrl |= HDMI_INFOFRAME_CTRL0_AUDIO_INFO_SOURCE;
+ infofrm_ctrl |= HDMI_INFOFRAME_CTRL0_AUDIO_INFO_UPDATE;
+
+ audio_config &= ~HDMI_AUDIO_CFG_FIFO_WATERMARK__MASK;
+ audio_config |= HDMI_AUDIO_CFG_FIFO_WATERMARK(4);
+ audio_config |= HDMI_AUDIO_CFG_ENGINE_ENABLE;
+ } else {
+ hdmi_write(hdmi, REG_HDMI_GC, HDMI_GC_MUTE);
+ acr_pkt_ctrl &= ~HDMI_ACR_PKT_CTRL_CONT;
+ acr_pkt_ctrl &= ~HDMI_ACR_PKT_CTRL_SEND;
+ vbi_pkt_ctrl &= ~HDMI_VBI_PKT_CTRL_GC_ENABLE;
+ vbi_pkt_ctrl &= ~HDMI_VBI_PKT_CTRL_GC_EVERY_FRAME;
+ aud_pkt_ctrl &= ~HDMI_AUDIO_PKT_CTRL1_AUDIO_SAMPLE_SEND;
+ infofrm_ctrl &= ~HDMI_INFOFRAME_CTRL0_AUDIO_INFO_SEND;
+ infofrm_ctrl &= ~HDMI_INFOFRAME_CTRL0_AUDIO_INFO_CONT;
+ infofrm_ctrl &= ~HDMI_INFOFRAME_CTRL0_AUDIO_INFO_SOURCE;
+ infofrm_ctrl &= ~HDMI_INFOFRAME_CTRL0_AUDIO_INFO_UPDATE;
+ audio_config &= ~HDMI_AUDIO_CFG_ENGINE_ENABLE;
+ }
+
+ hdmi_write(hdmi, REG_HDMI_ACR_PKT_CTRL, acr_pkt_ctrl);
+ hdmi_write(hdmi, REG_HDMI_VBI_PKT_CTRL, vbi_pkt_ctrl);
+ hdmi_write(hdmi, REG_HDMI_AUDIO_PKT_CTRL1, aud_pkt_ctrl);
+ hdmi_write(hdmi, REG_HDMI_INFOFRAME_CTRL0, infofrm_ctrl);
+
+ hdmi_write(hdmi, REG_HDMI_AUD_INT,
+ COND(enabled, HDMI_AUD_INT_AUD_FIFO_URUN_INT) |
+ COND(enabled, HDMI_AUD_INT_AUD_SAM_DROP_INT));
+
+ hdmi_write(hdmi, REG_HDMI_AUDIO_CFG, audio_config);
+
+
+ DBG("audio %sabled", enabled ? "en" : "dis");
+
+ return 0;
+}
+
+int hdmi_audio_info_setup(struct hdmi *hdmi, bool enabled,
+ uint32_t num_of_channels, uint32_t channel_allocation,
+ uint32_t level_shift, bool down_mix)
+{
+ struct hdmi_audio *audio;
+
+ if (!hdmi)
+ return -ENXIO;
+
+ audio = &hdmi->audio;
+
+ if (num_of_channels >= ARRAY_SIZE(nchannels))
+ return -EINVAL;
+
+ audio->enabled = enabled;
+ audio->infoframe.channels = nchannels[num_of_channels];
+ audio->infoframe.channel_allocation = channel_allocation;
+ audio->infoframe.level_shift_value = level_shift;
+ audio->infoframe.downmix_inhibit = down_mix;
+
+ return hdmi_audio_update(hdmi);
+}
+
+void hdmi_audio_set_sample_rate(struct hdmi *hdmi, int rate)
+{
+ struct hdmi_audio *audio;
+
+ if (!hdmi)
+ return;
+
+ audio = &hdmi->audio;
+
+ if ((rate < 0) || (rate >= MSM_HDMI_SAMPLE_RATE_MAX))
+ return;
+
+ audio->rate = rate;
+ hdmi_audio_update(hdmi);
+}
projects / openwrt / staging / blogic.git / commitdiff