1 files changed, 334 insertions, 0 deletions
diff --git a/sound/hda/ext/hdac_ext_controller.c b/sound/hda/ext/hdac_ext_controller.c
new file mode 100644
index 000000000..b0c0ef824
--- /dev/null
+++ b/sound/hda/ext/hdac_ext_controller.c
@@ -0,0 +1,334 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  hdac-ext-controller.c - HD-audio extended controller functions.
+ *
+ *  Copyright (C) 2014-2015 Intel Corp
+ *  Author: Jeeja KP <jeeja.kp@intel.com>
+ *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <sound/hda_register.h>
+#include <sound/hdaudio_ext.h>
+
+/*
+ * maximum HDAC capablities we should parse to avoid endless looping:
+ * currently we have 4 extended caps, so this is future proof for now.
+ * extend when this limit is seen meeting in real HW
+ */
+#define HDAC_MAX_CAPS 10
+
+/*
+ * processing pipe helpers - these helpers are useful for dealing with HDA
+ * new capability of processing pipelines
+ */
+
+/**
+ * snd_hdac_ext_bus_ppcap_enable - enable/disable processing pipe capability
+ * @bus: the pointer to HDAC bus object
+ * @enable: flag to turn on/off the capability
+ */
+void snd_hdac_ext_bus_ppcap_enable(struct hdac_bus *bus, bool enable)
+{
+
+	if (!bus->ppcap) {
+		dev_err(bus->dev, "Address of PP capability is NULL");
+		return;
+	}
+
+	if (enable)
+		snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL,
+				 AZX_PPCTL_GPROCEN, AZX_PPCTL_GPROCEN);
+	else
+		snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL,
+				 AZX_PPCTL_GPROCEN, 0);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_ppcap_enable);
+
+/**
+ * snd_hdac_ext_bus_ppcap_int_enable - ppcap interrupt enable/disable
+ * @bus: the pointer to HDAC bus object
+ * @enable: flag to enable/disable interrupt
+ */
+void snd_hdac_ext_bus_ppcap_int_enable(struct hdac_bus *bus, bool enable)
+{
+
+	if (!bus->ppcap) {
+		dev_err(bus->dev, "Address of PP capability is NULL\n");
+		return;
+	}
+
+	if (enable)
+		snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL,
+				 AZX_PPCTL_PIE, AZX_PPCTL_PIE);
+	else
+		snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL,
+				 AZX_PPCTL_PIE, 0);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_ppcap_int_enable);
+
+/*
+ * Multilink helpers - these helpers are useful for dealing with HDA
+ * new multilink capability
+ */
+
+/**
+ * snd_hdac_ext_bus_get_ml_capabilities - get multilink capability
+ * @bus: the pointer to HDAC bus object
+ *
+ * This will parse all links and read the mlink capabilities and add them
+ * in hlink_list of extended hdac bus
+ * Note: this will be freed on bus exit by driver
+ */
+int snd_hdac_ext_bus_get_ml_capabilities(struct hdac_bus *bus)
+{
+	int idx;
+	u32 link_count;
+	struct hdac_ext_link *hlink;
+
+	link_count = readl(bus->mlcap + AZX_REG_ML_MLCD) + 1;
+
+	dev_dbg(bus->dev, "In %s Link count: %d\n", __func__, link_count);
+
+	for (idx = 0; idx < link_count; idx++) {
+		hlink  = kzalloc(sizeof(*hlink), GFP_KERNEL);
+		if (!hlink)
+			return -ENOMEM;
+		hlink->index = idx;
+		hlink->bus = bus;
+		hlink->ml_addr = bus->mlcap + AZX_ML_BASE +
+					(AZX_ML_INTERVAL * idx);
+		hlink->lcaps  = readl(hlink->ml_addr + AZX_REG_ML_LCAP);
+		hlink->lsdiid = readw(hlink->ml_addr + AZX_REG_ML_LSDIID);
+
+		/* since link in On, update the ref */
+		hlink->ref_count = 1;
+
+		list_add_tail(&hlink->list, &bus->hlink_list);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_ml_capabilities);
+
+/**
+ * snd_hdac_link_free_all- free hdac extended link objects
+ *
+ * @bus: the pointer to HDAC bus object
+ */
+
+void snd_hdac_link_free_all(struct hdac_bus *bus)
+{
+	struct hdac_ext_link *l;
+
+	while (!list_empty(&bus->hlink_list)) {
+		l = list_first_entry(&bus->hlink_list, struct hdac_ext_link, list);
+		list_del(&l->list);
+		kfree(l);
+	}
+}
+EXPORT_SYMBOL_GPL(snd_hdac_link_free_all);
+
+/**
+ * snd_hdac_ext_bus_get_link_index - get link based on codec name
+ * @bus: the pointer to HDAC bus object
+ * @codec_name: codec name
+ */
+struct hdac_ext_link *snd_hdac_ext_bus_get_link(struct hdac_bus *bus,
+						 const char *codec_name)
+{
+	int i;
+	struct hdac_ext_link *hlink = NULL;
+	int bus_idx, addr;
+
+	if (sscanf(codec_name, "ehdaudio%dD%d", &bus_idx, &addr) != 2)
+		return NULL;
+	if (bus->idx != bus_idx)
+		return NULL;
+	if (addr < 0 || addr > 31)
+		return NULL;
+
+	list_for_each_entry(hlink, &bus->hlink_list, list) {
+		for (i = 0; i < HDA_MAX_CODECS; i++) {
+			if (hlink->lsdiid & (0x1 << addr))
+				return hlink;
+		}
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_link);
+
+static int check_hdac_link_power_active(struct hdac_ext_link *link, bool enable)
+{
+	int timeout;
+	u32 val;
+	int mask = (1 << AZX_MLCTL_CPA_SHIFT);
+
+	udelay(3);
+	timeout = 150;
+
+	do {
+		val = readl(link->ml_addr + AZX_REG_ML_LCTL);
+		if (enable) {
+			if (((val & mask) >> AZX_MLCTL_CPA_SHIFT))
+				return 0;
+		} else {
+			if (!((val & mask) >> AZX_MLCTL_CPA_SHIFT))
+				return 0;
+		}
+		udelay(3);
+	} while (--timeout);
+
+	return -EIO;
+}
+
+/**
+ * snd_hdac_ext_bus_link_power_up -power up hda link
+ * @link: HD-audio extended link
+ */
+int snd_hdac_ext_bus_link_power_up(struct hdac_ext_link *link)
+{
+	snd_hdac_updatel(link->ml_addr, AZX_REG_ML_LCTL,
+			 AZX_MLCTL_SPA, AZX_MLCTL_SPA);
+
+	return check_hdac_link_power_active(link, true);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_up);
+
+/**
+ * snd_hdac_ext_bus_link_power_down -power down hda link
+ * @link: HD-audio extended link
+ */
+int snd_hdac_ext_bus_link_power_down(struct hdac_ext_link *link)
+{
+	snd_hdac_updatel(link->ml_addr, AZX_REG_ML_LCTL, AZX_MLCTL_SPA, 0);
+
+	return check_hdac_link_power_active(link, false);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down);
+
+/**
+ * snd_hdac_ext_bus_link_power_up_all -power up all hda link
+ * @bus: the pointer to HDAC bus object
+ */
+int snd_hdac_ext_bus_link_power_up_all(struct hdac_bus *bus)
+{
+	struct hdac_ext_link *hlink = NULL;
+	int ret;
+
+	list_for_each_entry(hlink, &bus->hlink_list, list) {
+		snd_hdac_updatel(hlink->ml_addr, AZX_REG_ML_LCTL,
+				 AZX_MLCTL_SPA, AZX_MLCTL_SPA);
+		ret = check_hdac_link_power_active(hlink, true);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_up_all);
+
+/**
+ * snd_hdac_ext_bus_link_power_down_all -power down all hda link
+ * @bus: the pointer to HDAC bus object
+ */
+int snd_hdac_ext_bus_link_power_down_all(struct hdac_bus *bus)
+{
+	struct hdac_ext_link *hlink = NULL;
+	int ret;
+
+	list_for_each_entry(hlink, &bus->hlink_list, list) {
+		snd_hdac_updatel(hlink->ml_addr, AZX_REG_ML_LCTL,
+				 AZX_MLCTL_SPA, 0);
+		ret = check_hdac_link_power_active(hlink, false);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down_all);
+
+int snd_hdac_ext_bus_link_get(struct hdac_bus *bus,
+				struct hdac_ext_link *link)
+{
+	unsigned long codec_mask;
+	int ret = 0;
+
+	mutex_lock(&bus->lock);
+
+	/*
+	 * if we move from 0 to 1, count will be 1 so power up this link
+	 * as well, also check the dma status and trigger that
+	 */
+	if (++link->ref_count == 1) {
+		if (!bus->cmd_dma_state) {
+			snd_hdac_bus_init_cmd_io(bus);
+			bus->cmd_dma_state = true;
+		}
+
+		ret = snd_hdac_ext_bus_link_power_up(link);
+
+		/*
+		 * clear the register to invalidate all the output streams
+		 */
+		snd_hdac_updatew(link->ml_addr, AZX_REG_ML_LOSIDV,
+				 ML_LOSIDV_STREAM_MASK, 0);
+		/*
+		 *  wait for 521usec for codec to report status
+		 *  HDA spec section 4.3 - Codec Discovery
+		 */
+		udelay(521);
+		codec_mask = snd_hdac_chip_readw(bus, STATESTS);
+		dev_dbg(bus->dev, "codec_mask = 0x%lx\n", codec_mask);
+		snd_hdac_chip_writew(bus, STATESTS, codec_mask);
+		if (!bus->codec_mask)
+			bus->codec_mask = codec_mask;
+	}
+
+	mutex_unlock(&bus->lock);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_get);
+
+int snd_hdac_ext_bus_link_put(struct hdac_bus *bus,
+				struct hdac_ext_link *link)
+{
+	int ret = 0;
+	struct hdac_ext_link *hlink;
+	bool link_up = false;
+
+	mutex_lock(&bus->lock);
+
+	/*
+	 * if we move from 1 to 0, count will be 0
+	 * so power down this link as well
+	 */
+	if (--link->ref_count == 0) {
+		ret = snd_hdac_ext_bus_link_power_down(link);
+
+		/*
+		 * now check if all links are off, if so turn off
+		 * cmd dma as well
+		 */
+		list_for_each_entry(hlink, &bus->hlink_list, list) {
+			if (hlink->ref_count) {
+				link_up = true;
+				break;
+			}
+		}
+
+		if (!link_up) {
+			snd_hdac_bus_stop_cmd_io(bus);
+			bus->cmd_dma_state = false;
+		}
+	}
+
+	mutex_unlock(&bus->lock);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_put);