[RFC 34/37] ASoC: Intel: avs: PCI driver implementation

[Cezary Rojewski <cezary.rojewski@intel.com>]

HDAudio bus is a PCI device. Add all functions necessary to probe such
device along with its removal sequence. Behaviour is similar to existing
solutions: sound/pci/hda and sound/soc/intel/skylake.

Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
---
 sound/soc/intel/Kconfig         |   3 +-
 sound/soc/intel/avs/avs.h       |   1 +
 sound/soc/intel/avs/core.c      | 499 ++++++++++++++++++++++++++++++++
 sound/soc/intel/avs/dsp.c       |   3 -
 sound/soc/intel/avs/registers.h |   1 +
 5 files changed, 503 insertions(+), 4 deletions(-)

diff --git a/sound/soc/intel/Kconfig b/sound/soc/intel/Kconfig
index 8c059e2a5a36..bb73a1a4eb79 100644
--- a/sound/soc/intel/Kconfig
+++ b/sound/soc/intel/Kconfig
@@ -217,9 +217,10 @@ config SND_SOC_INTEL_AVS
 	default n
 	select SND_SOC_ACPI
 	select SND_SOC_TOPOLOGY
+	select SND_HDA
 	select SND_HDA_EXT_CORE
 	select SND_HDA_DSP_LOADER
-	select SND_INTEL_NHLT
+	select SND_INTEL_DSP_CONFIG
 	select WANT_DEV_COREDUMP
 	help
 	  Enable support for Intel(R) cAVS 1.5 platforms with DSP
diff --git a/sound/soc/intel/avs/avs.h b/sound/soc/intel/avs/avs.h
index 653cdecf9d83..c2ed107d194d 100644
--- a/sound/soc/intel/avs/avs.h
+++ b/sound/soc/intel/avs/avs.h
@@ -112,6 +112,7 @@ struct avs_dev {
 	char **lib_names;
 
 	struct completion fw_ready;
+	struct work_struct probe_work;
 
 	struct nhlt_acpi_table *nhlt;
 	struct list_head comp_list;
diff --git a/sound/soc/intel/avs/core.c b/sound/soc/intel/avs/core.c
index b240ef3bde4e..85f28c4ffd63 100644
--- a/sound/soc/intel/avs/core.c
+++ b/sound/soc/intel/avs/core.c
@@ -14,9 +14,17 @@
 // foundation of this driver
 //
 
+#include <linux/module.h>
 #include <linux/pci.h>
+#include <sound/hda_codec.h>
+#include <sound/hda_i915.h>
+#include <sound/hda_register.h>
 #include <sound/hdaudio.h>
+#include <sound/hdaudio_ext.h>
+#include <sound/intel-dsp-config.h>
+#include <sound/intel-nhlt.h>
 #include "avs.h"
+#include "cldma.h"
 
 static void
 avs_hda_update_config_dword(struct hdac_bus *bus, u32 reg, u32 mask, u32 value)
@@ -60,3 +68,494 @@ void avs_hda_l1sen_enable(struct avs_dev *adev, bool enable)
 	value = enable ? AZX_VS_EM2_L1SEN : 0;
 	snd_hdac_chip_updatel(&adev->base.core, VS_EM2, AZX_VS_EM2_L1SEN, value);
 }
+
+static int avs_hdac_bus_init_streams(struct hdac_bus *bus)
+{
+	unsigned int gcap;
+	unsigned int cp_streams, pb_streams;
+
+	gcap = snd_hdac_chip_readw(bus, GCAP);
+	cp_streams = (gcap >> 8) & 0x0F;
+	pb_streams = (gcap >> 12) & 0x0F;
+	bus->num_streams = cp_streams + pb_streams;
+
+	snd_hdac_ext_stream_init_all(bus, 0, cp_streams,
+				     SNDRV_PCM_STREAM_CAPTURE);
+	snd_hdac_ext_stream_init_all(bus, cp_streams, pb_streams,
+				     SNDRV_PCM_STREAM_PLAYBACK);
+
+	return snd_hdac_bus_alloc_stream_pages(bus);
+}
+
+static bool avs_hdac_bus_init_chip(struct hdac_bus *bus, bool full_reset)
+{
+	struct hdac_ext_link *hlink;
+	bool ret;
+
+	avs_hdac_clock_gating_enable(bus, false);
+	ret = snd_hdac_bus_init_chip(bus, full_reset);
+
+	/* Reset stream-to-link mapping */
+	list_for_each_entry(hlink, &bus->hlink_list, list)
+		writel(0, hlink->ml_addr + AZX_REG_ML_LOSIDV);
+
+	avs_hdac_clock_gating_enable(bus, true);
+
+	/* Set DUM bit to address incorrect position reporting for capture
+	 * streams. In order to do so, CTRL needs to be out of reset state
+	 */
+	snd_hdac_chip_updatel(bus, VS_EM2, AZX_VS_EM2_DUM, AZX_VS_EM2_DUM);
+
+	return ret;
+}
+
+static int probe_codec(struct hdac_bus *bus, int addr)
+{
+	struct hda_codec *codec;
+	unsigned int cmd = (addr << 28) | (AC_NODE_ROOT << 20) |
+		(AC_VERB_PARAMETERS << 8) | AC_PAR_VENDOR_ID;
+	unsigned int res = -1;
+	int ret;
+
+	mutex_lock(&bus->cmd_mutex);
+	snd_hdac_bus_send_cmd(bus, cmd);
+	snd_hdac_bus_get_response(bus, addr, &res);
+	mutex_unlock(&bus->cmd_mutex);
+	if (res == -1)
+		return -EIO;
+
+	dev_dbg(bus->dev, "codec #%d probed OK: 0x%x\n", addr, res);
+
+	codec = snd_hda_codec_device_init(to_hda_bus(bus), addr, "hdaudioB%dD%d",
+					  bus->idx, addr);
+	if (IS_ERR(codec)) {
+		dev_err(bus->dev, "init codec failed: %ld\n", PTR_ERR(codec));
+		return PTR_ERR(codec);
+	}
+	/*
+	 * Allow avs_core suspend by forcing suspended state on all
+	 * of its codec child devices. Component interested in
+	 * dealing with hda codecs directly takes pm responsibilities
+	 */
+	pm_runtime_set_suspended(hda_codec_dev(codec));
+
+	/* configure effectively creates new ASoC component */
+	ret = snd_hda_codec_configure(codec);
+	if (ret < 0) {
+		dev_err(bus->dev, "failed to config codec %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void avs_hdac_bus_probe_codecs(struct hdac_bus *bus)
+{
+	int c;
+
+	/* First try to probe all given codec slots */
+	for (c = 0; c < HDA_MAX_CODECS; c++) {
+		if (!(bus->codec_mask & BIT(c)))
+			continue;
+
+		if (!probe_codec(bus, c))
+			/* success, continue probing */
+			continue;
+
+		/*
+		 * Some BIOSen give you wrong codec addresses
+		 * that don't exist
+		 */
+		dev_warn(bus->dev,
+			 "Codec #%d probe error; disabling it...\n", c);
+		bus->codec_mask &= ~BIT(c);
+		/*
+		 * More badly, accessing to a non-existing
+		 * codec often screws up the controller bus,
+		 * and disturbs the further communications.
+		 * Thus if an error occurs during probing,
+		 * better to reset the controller bus to get
+		 * back to the sanity state.
+		 */
+		snd_hdac_bus_stop_chip(bus);
+		avs_hdac_bus_init_chip(bus, true);
+	}
+}
+
+static void avs_hda_probe_work(struct work_struct *work)
+{
+	struct avs_dev *adev =
+		container_of(work, struct avs_dev, probe_work);
+	struct hdac_bus *bus = &adev->base.core;
+	struct hdac_ext_link *hlink;
+	int ret;
+
+	ret = snd_hdac_i915_init(bus);
+	if (ret < 0)
+		dev_info(bus->dev, "i915 init unsuccessful: %d\n", ret);
+
+	snd_hdac_display_power(bus, HDA_CODEC_IDX_CONTROLLER, true);
+	avs_hdac_bus_init_chip(bus, true);
+	avs_hdac_bus_probe_codecs(bus);
+	snd_hdac_display_power(bus, HDA_CODEC_IDX_CONTROLLER, false);
+
+	/* with all codecs probed, links can be powered down */
+	list_for_each_entry(hlink, &bus->hlink_list, list)
+		snd_hdac_ext_bus_link_put(bus, hlink);
+
+	snd_hdac_ext_bus_ppcap_enable(bus, true);
+	snd_hdac_ext_bus_ppcap_int_enable(bus, true);
+
+	ret = avs_dsp_first_boot_firmware(adev);
+	if (ret < 0)
+		return;
+
+	adev->nhlt = intel_nhlt_init(adev->dev);
+	if (!adev->nhlt)
+		dev_info(bus->dev, "platform has no NHLT\n");
+
+	avs_register_all_boards(adev);
+
+	/* configure PM */
+	pm_runtime_set_autosuspend_delay(bus->dev, 2000);
+	pm_runtime_use_autosuspend(bus->dev);
+	pm_runtime_mark_last_busy(bus->dev);
+	pm_runtime_put_autosuspend(bus->dev);
+	pm_runtime_allow(bus->dev);
+}
+
+static void hdac_stream_update_pos(struct hdac_stream *stream, u64 buffer_size)
+{
+	u64 prev_pos, pos, num_bytes;
+
+	div64_u64_rem(stream->curr_pos, buffer_size, &prev_pos);
+	pos = snd_hdac_stream_get_pos_posbuf(stream);
+
+	if (pos < prev_pos)
+		num_bytes = (buffer_size - prev_pos) +  pos;
+	else
+		num_bytes = pos - prev_pos;
+
+	stream->curr_pos += num_bytes;
+}
+
+/* called from IRQ */
+static void hdac_update_stream(struct hdac_bus *bus, struct hdac_stream *stream)
+{
+	if (stream->substream) {
+		snd_pcm_period_elapsed(stream->substream);
+	} else if (stream->cstream) {
+		u64 buffer_size = stream->cstream->runtime->buffer_size;
+
+		hdac_stream_update_pos(stream, buffer_size);
+		snd_compr_fragment_elapsed(stream->cstream);
+	}
+}
+
+static irqreturn_t hdac_bus_irq_handler(int irq, void *context)
+{
+	struct hdac_bus *bus = context;
+	u32 status;
+	u32 mask, int_enable;
+	int ret = IRQ_NONE;
+
+	if (!pm_runtime_active(bus->dev))
+		return ret;
+
+	spin_lock(&bus->reg_lock);
+
+	status = snd_hdac_chip_readl(bus, INTSTS);
+	if (status == 0 || status == UINT_MAX) {
+		spin_unlock(&bus->reg_lock);
+		return ret;
+	}
+
+	/* clear rirb int */
+	status = snd_hdac_chip_readb(bus, RIRBSTS);
+	if (status & RIRB_INT_MASK) {
+		if (status & RIRB_INT_RESPONSE)
+			snd_hdac_bus_update_rirb(bus);
+		snd_hdac_chip_writeb(bus, RIRBSTS, RIRB_INT_MASK);
+	}
+
+	mask = (0x1 << bus->num_streams) - 1;
+
+	status = snd_hdac_chip_readl(bus, INTSTS);
+	status &= mask;
+	if (status) {
+		/* Disable stream interrupts; Re-enable in bottom half */
+		int_enable = snd_hdac_chip_readl(bus, INTCTL);
+		snd_hdac_chip_writel(bus, INTCTL, (int_enable & (~mask)));
+		ret = IRQ_WAKE_THREAD;
+	} else
+		ret = IRQ_HANDLED;
+
+	spin_unlock(&bus->reg_lock);
+	return ret;
+}
+
+static irqreturn_t hdac_bus_irq_thread(int irq, void *context)
+{
+	struct hdac_bus *bus = context;
+	u32 status;
+	u32 int_enable;
+	u32 mask;
+	unsigned long flags;
+
+	status = snd_hdac_chip_readl(bus, INTSTS);
+
+	snd_hdac_bus_handle_stream_irq(bus, status, hdac_update_stream);
+
+	/* Re-enable stream interrupts */
+	mask = (0x1 << bus->num_streams) - 1;
+	spin_lock_irqsave(&bus->reg_lock, flags);
+	int_enable = snd_hdac_chip_readl(bus, INTCTL);
+	snd_hdac_chip_writel(bus, INTCTL, (int_enable | mask));
+	spin_unlock_irqrestore(&bus->reg_lock, flags);
+
+	return IRQ_HANDLED;
+}
+
+static int avs_hdac_acquire_irq(struct avs_dev *adev)
+{
+	struct hdac_bus *bus = &adev->base.core;
+	struct pci_dev *pci = to_pci_dev(bus->dev);
+	int ret;
+
+	/* request one and check that we only got one interrupt */
+	ret = pci_alloc_irq_vectors(pci, 1, 1, PCI_IRQ_MSI | PCI_IRQ_LEGACY);
+	if (ret != 1) {
+		dev_err(adev->dev, "Failed to allocate IRQ vector: %d\n", ret);
+		return ret;
+	}
+
+	ret = pci_request_irq(pci, 0, hdac_bus_irq_handler, hdac_bus_irq_thread,
+			      bus, KBUILD_MODNAME);
+	if (ret < 0) {
+		dev_err(adev->dev, "Failed to request stream IRQ handler: %d\n", ret);
+		goto free_vector;
+	}
+
+	ret = pci_request_irq(pci, 0, avs_dsp_irq_handler, avs_dsp_irq_thread,
+			      adev, KBUILD_MODNAME);
+	if (ret < 0) {
+		dev_err(adev->dev, "Failed to request IPC IRQ handler: %d\n", ret);
+		goto free_stream_irq;
+	}
+
+	return 0;
+
+free_stream_irq:
+	pci_free_irq(pci, 0, bus);
+free_vector:
+	pci_free_irq_vectors(pci);
+	return ret;
+}
+
+static int avs_bus_init(struct avs_dev *adev, struct pci_dev *pci,
+			const struct pci_device_id *id)
+{
+	struct hda_bus *bus = &adev->base;
+	struct avs_ipc *ipc;
+	struct device *dev = &pci->dev;
+	int ret;
+
+	ret = snd_hdac_ext_bus_init(&bus->core, dev, NULL, NULL);
+	if (ret < 0)
+		return ret;
+
+	bus->core.use_posbuf = 1;
+	bus->core.bdl_pos_adj = 0;
+	bus->core.sync_write = 1;
+	bus->pci = pci;
+	bus->mixer_assigned = -1;
+	mutex_init(&bus->prepare_mutex);
+
+	ipc = devm_kzalloc(dev, sizeof(*ipc), GFP_KERNEL);
+	if (!ipc)
+		return -ENOMEM;
+	ret = avs_ipc_init(ipc, dev);
+	if (ret < 0)
+		return ret;
+
+	adev->dev = dev;
+	adev->spec = (const struct avs_spec *)id->driver_data;
+	adev->ipc = ipc;
+	INIT_WORK(&adev->probe_work, avs_hda_probe_work);
+	INIT_LIST_HEAD(&adev->comp_list);
+	INIT_LIST_HEAD(&adev->path_list);
+	INIT_LIST_HEAD(&adev->fw_list);
+	init_completion(&adev->fw_ready);
+	spin_lock_init(&adev->path_list_lock);
+	mutex_init(&adev->modres_mutex);
+	mutex_init(&adev->comp_list_mutex);
+	mutex_init(&adev->path_mutex);
+
+	return 0;
+}
+
+static int avs_pci_probe(struct pci_dev *pci, const struct pci_device_id *id)
+{
+	struct hdac_bus *bus;
+	struct avs_dev *adev;
+	struct device *dev = &pci->dev;
+	int ret;
+
+	ret = snd_intel_dsp_driver_probe(pci);
+	if (ret != SND_INTEL_DSP_DRIVER_ANY && ret != SND_INTEL_DSP_DRIVER_SST)
+		return -ENODEV;
+
+	ret = pcim_enable_device(pci);
+	if (ret < 0)
+		return ret;
+
+	adev = devm_kzalloc(dev, sizeof(*adev), GFP_KERNEL);
+	if (!adev)
+		return -ENOMEM;
+	ret = avs_bus_init(adev, pci, id);
+	if (ret < 0) {
+		dev_err(dev, "failed to init avs bus: %d\n", ret);
+		return ret;
+	}
+
+	ret = pci_request_regions(pci, "AVS HDAudio");
+	if (ret < 0)
+		return ret;
+
+	bus = &adev->base.core;
+	bus->addr = pci_resource_start(pci, 0);
+	bus->remap_addr = pci_ioremap_bar(pci, 0);
+	if (!bus->remap_addr) {
+		dev_err(bus->dev, "ioremap error\n");
+		ret = -ENXIO;
+		goto err_remap_bar0;
+	}
+
+	adev->adsp_ba = pci_ioremap_bar(pci, 4);
+	if (!adev->adsp_ba) {
+		dev_err(bus->dev, "ioremap error\n");
+		ret = -ENXIO;
+		goto err_remap_bar4;
+	}
+
+	snd_hdac_bus_parse_capabilities(bus);
+	if (bus->mlcap)
+		snd_hdac_ext_bus_get_ml_capabilities(bus);
+
+	if (!dma_set_mask(dev, DMA_BIT_MASK(64))) {
+		dma_set_coherent_mask(dev, DMA_BIT_MASK(64));
+	} else {
+		dma_set_mask(dev, DMA_BIT_MASK(32));
+		dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
+	}
+
+	ret = avs_hdac_bus_init_streams(bus);
+	if (ret < 0) {
+		dev_err(dev, "failed to init streams: %d\n", ret);
+		goto err_init_streams;
+	}
+
+	ret = avs_hdac_acquire_irq(adev);
+	if (ret < 0) {
+		dev_err(bus->dev, "failed to acquire irq: %d\n", ret);
+		goto err_acquire_irq;
+	}
+
+	pci_set_master(pci);
+	pci_set_drvdata(pci, bus);
+	device_disable_async_suspend(dev);
+
+	schedule_work(&adev->probe_work);
+
+	return 0;
+
+err_acquire_irq:
+	snd_hdac_bus_free_stream_pages(bus);
+	snd_hdac_stream_free_all(bus);
+err_init_streams:
+	iounmap(adev->adsp_ba);
+err_remap_bar4:
+	iounmap(bus->remap_addr);
+err_remap_bar0:
+	pci_release_regions(pci);
+	return ret;
+}
+
+static void avs_pci_remove(struct pci_dev *pci)
+{
+	struct hdac_device *hdev, *save;
+	struct hdac_bus *bus = pci_get_drvdata(pci);
+	struct avs_dev *adev = hdac_to_avs(bus);
+
+	cancel_work_sync(&adev->probe_work);
+	avs_ipc_block(adev->ipc);
+
+	avs_unregister_all_boards(adev);
+
+	if (adev->nhlt)
+		intel_nhlt_free(adev->nhlt);
+
+	if (avs_platattr_test(adev, CLDMA))
+		hda_cldma_free(&code_loader);
+
+	snd_hdac_ext_stop_streams(bus);
+	avs_dsp_op(adev, int_control, false);
+	snd_hdac_ext_bus_ppcap_int_enable(bus, false);
+
+	/* it is safe to remove all codecs from the system now */
+	list_for_each_entry_safe(hdev, save, &bus->codec_list, list)
+		snd_hda_codec_unregister(hdac_to_hda_codec(hdev));
+
+	snd_hdac_bus_free_stream_pages(bus);
+	snd_hdac_stream_free_all(bus);
+	/* reverse ml_capabilities */
+	snd_hdac_link_free_all(bus);
+	snd_hdac_ext_bus_exit(bus);
+
+	if (adev->hw_cfg.dsp_cores)
+		avs_dsp_core_disable(adev, GENMASK(adev->hw_cfg.dsp_cores - 1, 0));
+	snd_hdac_ext_bus_ppcap_enable(bus, false);
+
+	/* snd_hdac_ext_stop_streams does that already? */
+	snd_hdac_bus_stop_chip(bus);
+	snd_hdac_display_power(bus, HDA_CODEC_IDX_CONTROLLER, false);
+	if (bus->audio_component)
+		snd_hdac_i915_exit(bus);
+
+	avs_module_info_free(adev);
+	pci_free_irq(pci, 0, adev);
+	pci_free_irq(pci, 0, bus);
+	pci_free_irq_vectors(pci);
+	iounmap(bus->remap_addr);
+	iounmap(adev->adsp_ba);
+	pci_release_regions(pci);
+
+	/* should not need FW anymore */
+	avs_release_firmwares(adev);
+
+#ifdef CONFIG_PM
+	/* pm_runtime_forbid() can rpm_resume() which we don't want */
+	if (pci->dev.power.runtime_auto)
+		pm_runtime_get_noresume(&pci->dev);
+#endif
+}
+
+static const struct pci_device_id avs_ids[] = {
+	{ 0 }
+};
+MODULE_DEVICE_TABLE(pci, avs_ids);
+
+static struct pci_driver avs_pci_driver = {
+	.name = KBUILD_MODNAME,
+	.id_table = avs_ids,
+	.probe = avs_pci_probe,
+	.remove = avs_pci_remove,
+	.driver = {
+	},
+};
+module_pci_driver(avs_pci_driver);
+
+MODULE_AUTHOR("Cezary Rojewski <cezary.rojewski@intel.com>");
+MODULE_AUTHOR("Amadeusz Slawinski <amadeuszx.slawinski@linux.intel.com>");
+MODULE_DESCRIPTION("Intel cAVS sound driver");
+MODULE_LICENSE("GPL v2");
diff --git a/sound/soc/intel/avs/dsp.c b/sound/soc/intel/avs/dsp.c
index 5174175e9238..9e20062adf05 100644
--- a/sound/soc/intel/avs/dsp.c
+++ b/sound/soc/intel/avs/dsp.c
@@ -6,7 +6,6 @@
 //          Amadeusz Slawinski <amadeuszx.slawinski@linux.intel.com>
 //
 
-#include <linux/module.h>
 #include <sound/hdaudio_ext.h>
 #include "avs.h"
 #include "registers.h"
@@ -325,5 +324,3 @@ int avs_dsp_delete_pipeline(struct avs_dev *adev, u8 instance_id)
 	ida_free(&adev->ppl_ida, instance_id);
 	return ret;
 }
-
-MODULE_LICENSE("GPL v2");
diff --git a/sound/soc/intel/avs/registers.h b/sound/soc/intel/avs/registers.h
index 369c55c62f81..3b6b251663b5 100644
--- a/sound/soc/intel/avs/registers.h
+++ b/sound/soc/intel/avs/registers.h
@@ -14,6 +14,7 @@
 #define AZX_PGCTL_LSRMD_MASK		BIT(4)
 #define AZX_CGCTL_MISCBDCGE_MASK	BIT(6)
 #define AZX_VS_EM2_L1SEN		BIT(13)
+#define AZX_VS_EM2_DUM			BIT(23)
 
 /* Intel HD Audio General DSP Registers */
 #define AVS_ADSP_GEN_BASE		0x0
-- 
2.25.1