HDA driver support for Phytium desktop

(cherry picked from commit 61b278c01b)
Signed-off-by: Alex Shi <alexsshi@tencent.com>

include/sound/hdaudio.h

@@ -343,6 +343,7 @@ struct hdac_bus {
 
 	int poll_count;
 
+	bool cmd_resend:1;              /* command resend */
 	int bdl_pos_adj;		/* BDL position adjustment */
 
 	/* locks */

sound/hda/hdac_controller.c

@@ -142,6 +142,9 @@ int snd_hdac_bus_send_cmd(struct hdac_bus *bus, unsigned int val)
 {
 	unsigned int addr = azx_command_addr(val);
 	unsigned int wp, rp;
+	unsigned long timeout;
+	unsigned int rirb_wp;
+	int i = 0;
 
 	spin_lock_irq(&bus->reg_lock);
 
@@ -168,6 +171,41 @@ int snd_hdac_bus_send_cmd(struct hdac_bus *bus, unsigned int val)
 	bus->corb.buf[wp] = cpu_to_le32(val);
 	snd_hdac_chip_writew(bus, CORBWP, wp);
 
+	if (bus->cmd_resend) {
+		timeout = jiffies + msecs_to_jiffies(1000);
+		udelay(80);
+		rirb_wp = snd_hdac_chip_readw(bus, RIRBWP);
+		while (rirb_wp == bus->rirb.wp) {
+			udelay(80);
+			rirb_wp = snd_hdac_chip_readw(bus, RIRBWP);
+			if (rirb_wp != bus->rirb.wp)
+				break;
+			if (i > 5)
+				break;
+			if (time_after(jiffies, timeout))
+				break;
+
+			/* add command to corb */
+			wp = snd_hdac_chip_readw(bus, CORBWP);
+			if (wp == 0xffff) {
+				/* something wrong, controller likely turned to D3 */
+				spin_unlock_irq(&bus->reg_lock);
+				return -EIO;
+			}
+			wp++;
+			wp %= AZX_MAX_CORB_ENTRIES;
+
+			rp = snd_hdac_chip_readw(bus, CORBRP);
+			if (wp == rp) {
+				/* oops, it's full */
+				spin_unlock_irq(&bus->reg_lock);
+				return -EAGAIN;
+			}
+			bus->corb.buf[wp] = cpu_to_le32(val);
+			snd_hdac_chip_writew(bus, CORBWP, wp);
+			i++;
+		}
+	}
 	spin_unlock_irq(&bus->reg_lock);
 
 	return 0;

sound/hda/hdac_stream.c

@@ -87,7 +87,11 @@ void snd_hdac_stream_start(struct hdac_stream *azx_dev, bool fresh_start)
 
 	trace_snd_hdac_stream_start(bus, azx_dev);
 
+#ifdef CONFIG_SND_HDA_PHYTIUM
+	azx_dev->start_wallclk = snd_hdac_chip_readl(bus, WALLCLK) / 15;
+#else
 	azx_dev->start_wallclk = snd_hdac_chip_readl(bus, WALLCLK);
+#endif
 	if (!fresh_start)
 		azx_dev->start_wallclk -= azx_dev->period_wallclk;
 
@@ -514,7 +518,11 @@ static u64 azx_cc_read(const struct cyclecounter *cc)
 {
 	struct hdac_stream *azx_dev = container_of(cc, struct hdac_stream, cc);
 
+#ifdef CONFIG_SND_HDA_PHYTIUM
+	return snd_hdac_chip_readl(azx_dev->bus, WALLCLK) / 25;
+#else
 	return snd_hdac_chip_readl(azx_dev->bus, WALLCLK);
+#endif
 }
 
 static void azx_timecounter_init(struct hdac_stream *azx_dev,

sound/pci/hda/Kconfig

@@ -23,6 +23,23 @@ config SND_HDA_INTEL
 	  To compile this driver as a module, choose M here: the module
 	  will be called snd-hda-intel.
 
+config SND_HDA_PHYTIUM
+	tristate "PHYTIUM HD Audio"
+	depends on SOUND
+	select SND_HDA
+	select SND_HDA_ALIGNED_MMIO
+	help
+	  Say Y here to support the HDA controller present in PHYTIUM
+	  SoCs
+
+	  This options enables support for the HD Audio controller
+	  present in some PHYTIUM SoCs, used to communicate audio
+	  to the "High Definition Audio" codec.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called snd-hda-phytium.
+
+
 config SND_HDA_INTEL_DETECT_DMIC
 	bool "DMIC detection and probe abort"
 	depends on SND_HDA_INTEL

sound/pci/hda/Makefile

@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0
 snd-hda-intel-objs := hda_intel.o
+snd-hda-phytium-objs := hda_phytium.o
 snd-hda-tegra-objs := hda_tegra.o
 
 snd-hda-codec-y := hda_bind.o hda_codec.o hda_jack.o hda_auto_parser.o hda_sysfs.o
@@ -47,4 +48,5 @@ obj-$(CONFIG_SND_HDA_CODEC_HDMI) += snd-hda-codec-hdmi.o
 # otherwise the codec patches won't be hooked before the PCI probe
 # when built in kernel
 obj-$(CONFIG_SND_HDA_INTEL) += snd-hda-intel.o
+obj-$(CONFIG_SND_HDA_PHYTIUM) += snd-hda-phytium.o
 obj-$(CONFIG_SND_HDA_TEGRA) += snd-hda-tegra.o

sound/pci/hda/hda_controller.c

@@ -17,6 +17,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/slab.h>
 
+#include "hda_phytium.h"
 #ifdef CONFIG_X86
 /* for art-tsc conversion */
 #include <asm/tsc.h>
@@ -160,6 +161,8 @@ static int azx_pcm_prepare(struct snd_pcm_substream *substream)
 		snd_hda_spdif_out_of_nid(apcm->codec, hinfo->nid);
 	unsigned short ctls = spdif ? spdif->ctls : 0;
 
+	struct hda_ft *hda = container_of(chip, struct hda_ft, chip);
+	hda->substream = substream;
 	trace_azx_pcm_prepare(chip, azx_dev);
 	dsp_lock(azx_dev);
 	if (dsp_is_locked(azx_dev)) {

sound/pci/hda/hda_phytium.h

@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Implementation of primary ALSA driver code base for Phytium HD Audio.
+ *
+ * Copyright(c) 2018-2022, Phytium Technology Co., Ltd.
+ */
+#ifndef __SOUND_HDA_PHYTIUM_H__
+#define __SOUND_HDA_PHYTIUM_H__
+#include "hda_controller.h"
+struct hda_ft {
+	struct azx chip;
+	struct snd_pcm_substream *substream;
+	struct device *dev;
+	void __iomem *regs;
+	/* for pending irqs */
+	struct work_struct irq_pending_work;
+	/* sync probing */
+	struct completion probe_wait;
+	struct work_struct probe_work;
+	/* card list (for power_save trigger) */
+	struct list_head list;
+	/* extra flags */
+	unsigned int irq_pending_warned:1;
+	unsigned int probe_continued:1;
+};
+#endif