ALSA: hdac_ext: add hdac extended controller

The controller needs to support the new capabilities and allow
reading, parsing and initializing of these capabilities, so this patch
does it

Signed-off-by: Jeeja KP <[e-mail]>
Signed-off-by: Vinod Koul <[e-mail]>
Signed-off-by: Takashi Iwai <[e-mail]>

include/sound/hdaudio_ext.h

···
 void snd_hdac_ext_bus_ppcap_enable(struct hdac_ext_bus *chip, bool enable);
 void snd_hdac_ext_bus_ppcap_int_enable(struct hdac_ext_bus *chip, bool enable);
 
+void snd_hdac_ext_stream_spbcap_enable(struct hdac_ext_bus *chip,
+				 bool enable, int index);
+
+int snd_hdac_ext_bus_get_ml_capabilities(struct hdac_ext_bus *bus);
+int snd_hdac_ext_bus_map_codec_to_link(struct hdac_ext_bus *bus, int addr);
+struct hdac_ext_link *snd_hdac_ext_bus_get_link(struct hdac_ext_bus *bus,
+						const char *codec_name);
+
+enum hdac_ext_stream_type {
+	HDAC_EXT_STREAM_TYPE_COUPLED = 0,
+	HDAC_EXT_STREAM_TYPE_HOST,
+	HDAC_EXT_STREAM_TYPE_LINK
+};
+
+struct hdac_ext_link {
+	struct hdac_bus *bus;
+	int index;
+	void __iomem *ml_addr; /* link output stream reg pointer */
+	u32 lcaps;   /* link capablities */
+	u16 lsdiid;  /* link sdi identifier */
+	struct list_head list;
+};
+
+int snd_hdac_ext_bus_link_power_up(struct hdac_ext_link *link);
+int snd_hdac_ext_bus_link_power_down(struct hdac_ext_link *link);
+void snd_hdac_ext_link_set_stream_id(struct hdac_ext_link *link,
+				 int stream);
+void snd_hdac_ext_link_clear_stream_id(struct hdac_ext_link *link,
+				 int stream);
+
+/* update register macro */
+#define snd_hdac_updatel(addr, reg, mask, val)		\
+	writel(((readl(addr + reg) & ~(mask)) | (val)), \
+		addr + reg)
+
 #endif /* __SOUND_HDAUDIO_EXT_H */

sound/hda/ext/Makefile

···
-snd-hda-ext-core-objs := hdac_ext_bus.o
+snd-hda-ext-core-objs := hdac_ext_bus.o hdac_ext_controller.o
 
 obj-$(CONFIG_SND_HDA_EXT_CORE) += snd-hda-ext-core.o

sound/hda/ext/hdac_ext_controller.c

···
+/*
+ *  hdac-ext-controller.c - HD-audio extended controller functions.
+ *
+ *  Copyright (C) 2014-2015 Intel Corp
+ *  Author: Jeeja KP <[e-mail]>
+ *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  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.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#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
+
+/**
+ * snd_hdac_ext_bus_parse_capabilities - parse capablity structure
+ * @ebus: the pointer to extended bus object
+ *
+ * Returns 0 if successful, or a negative error code.
+ */
+int snd_hdac_ext_bus_parse_capabilities(struct hdac_ext_bus *ebus)
+{
+	unsigned int cur_cap;
+	unsigned int offset;
+	struct hdac_bus *bus = &ebus->bus;
+	unsigned int counter = 0;
+
+	offset = snd_hdac_chip_readl(bus, LLCH);
+
+	if (offset < 0)
+		return -EIO;
+
+	/* Lets walk the linked capabilities list */
+	do {
+		cur_cap = _snd_hdac_chip_read(l, bus, offset);
+
+		if (cur_cap < 0)
+			return -EIO;
+
+		dev_dbg(bus->dev, "Capability version: 0x%x\n",
+				((cur_cap & AZX_CAP_HDR_VER_MASK) >> AZX_CAP_HDR_VER_OFF));
+
+		dev_dbg(bus->dev, "HDA capability ID: 0x%x\n",
+				(cur_cap & AZX_CAP_HDR_ID_MASK) >> AZX_CAP_HDR_ID_OFF);
+
+		switch ((cur_cap & AZX_CAP_HDR_ID_MASK) >> AZX_CAP_HDR_ID_OFF) {
+		case AZX_ML_CAP_ID:
+			dev_dbg(bus->dev, "Found ML capability\n");
+			ebus->mlcap = bus->remap_addr + offset;
+			break;
+
+		case AZX_GTS_CAP_ID:
+			dev_dbg(bus->dev, "Found GTS capability offset=%x\n", offset);
+			ebus->gtscap = bus->remap_addr + offset;
+			break;
+
+		case AZX_PP_CAP_ID:
+			/* PP capability found, the Audio DSP is present */
+			dev_dbg(bus->dev, "Found PP capability offset=%x\n", offset);
+			ebus->ppcap = bus->remap_addr + offset;
+			break;
+
+		case AZX_SPB_CAP_ID:
+			/* SPIB capability found, handler function */
+			dev_dbg(bus->dev, "Found SPB capability\n");
+			ebus->spbcap = bus->remap_addr + offset;
+			break;
+
+		default:
+			dev_dbg(bus->dev, "Unknown capability %d\n", cur_cap);
+			break;
+		}
+
+		counter++;
+
+		if (counter > HDAC_MAX_CAPS) {
+			dev_err(bus->dev, "We exceeded HDAC Ext capablities!!!\n");
+			break;
+		}
+
+		/* read the offset of next capabiity */
+		offset = cur_cap & AZX_CAP_HDR_NXT_PTR_MASK;
+
+	} while (offset);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_parse_capabilities);
+
+/*
+ * 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
+ * @ebus: HD-audio extended core bus
+ * @enable: flag to turn on/off the capability
+ */
+void snd_hdac_ext_bus_ppcap_enable(struct hdac_ext_bus *ebus, bool enable)
+{
+	struct hdac_bus *bus = &ebus->bus;
+
+	if (!ebus->ppcap) {
+		dev_err(bus->dev, "Address of PP capability is NULL");
+		return;
+	}
+
+	if (enable)
+		snd_hdac_updatel(ebus->ppcap, AZX_REG_PP_PPCTL, 0, AZX_PPCTL_GPROCEN);
+	else
+		snd_hdac_updatel(ebus->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
+ * @ebus: HD-audio extended core bus
+ * @enable: flag to enable/disable interrupt
+ */
+void snd_hdac_ext_bus_ppcap_int_enable(struct hdac_ext_bus *ebus, bool enable)
+{
+	struct hdac_bus *bus = &ebus->bus;
+
+	if (!ebus->ppcap) {
+		dev_err(bus->dev, "Address of PP capability is NULL\n");
+		return;
+	}
+
+	if (enable)
+		snd_hdac_updatel(ebus->ppcap, AZX_REG_PP_PPCTL, 0, AZX_PPCTL_PIE);
+	else
+		snd_hdac_updatel(ebus->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
+ * @ebus: HD-audio extended core bus
+ *
+ * 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_ext_bus *ebus)
+{
+	int idx;
+	u32 link_count;
+	struct hdac_ext_link *hlink;
+	struct hdac_bus *bus = &ebus->bus;
+
+	link_count = readl(ebus->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 = ebus->mlcap + AZX_ML_BASE +
+					(AZX_ML_INTERVAL * idx);
+		hlink->lcaps  = snd_hdac_chip_readl(bus, ML_LCAP);
+		hlink->lsdiid = snd_hdac_chip_readw(bus, ML_LSDIID);
+
+		list_add_tail(&hlink->list, &ebus->hlink_list);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_ml_capabilities);
+
+/**
+ * snd_hdac_ext_bus_get_link_index - get link based on codec name
+ * @ebus: HD-audio extended core bus
+ * @codec_name: codec name
+ */
+struct hdac_ext_link *snd_hdac_ext_bus_get_link(struct hdac_ext_bus *ebus,
+						 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 (ebus->idx != bus_idx)
+		return NULL;
+
+	list_for_each_entry(hlink, &ebus->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);
+
+	udelay(3);
+	timeout = 50;
+
+	do {
+		val = snd_hdac_chip_readl(link->bus, ML_LCTL);
+		if (enable) {
+			if (((val & mask) >> AZX_MLCTL_CPA))
+				return 0;
+		} else {
+			if (!((val & mask) >> AZX_MLCTL_CPA))
+				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_chip_updatel(link->bus, ML_LCTL, 0, 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_chip_updatel(link->bus, ML_LCTL, AZX_MLCTL_SPA, 0);
+
+	return check_hdac_link_power_active(link, false);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down);