1 files changed, 288 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 000000000000..b2da19b60f4e
--- /dev/null
+++ b/sound/hda/ext/hdac_ext_controller.c
@@ -0,0 +1,288 @@
+/*
+ *  hdac-ext-controller.c - HD-audio extended controller functions.
+ *
+ *  Copyright (C) 2014-2015 Intel Corp
+ *  Author: Jeeja KP <jeeja.kp@intel.com>
+ *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  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_link_free_all- free hdac extended link objects
+ *
+ * @ebus: HD-audio ext core bus
+ */
+
+void snd_hdac_link_free_all(struct hdac_ext_bus *ebus)
+{
+        struct hdac_ext_link *l;
+
+        while (!list_empty(&ebus->hlink_list)) {
+                l = list_first_entry(&ebus->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
+ * @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);