--- /dev/null
+/*
+ * 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);
+
+ /* Lets walk the linked capabilities list */
+ do {
+ cur_cap = _snd_hdac_chip_read(l, bus, offset);
+
+ 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 = readl(hlink->ml_addr + AZX_REG_ML_LCAP);
+ hlink->lsdiid = readw(hlink->ml_addr + AZX_REG_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 = readl(link->ml_addr + AZX_REG_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_updatel(link->ml_addr, AZX_REG_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_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_down_all -power down all hda link
+ * @ebus: HD-audio extended bus
+ */
+int snd_hdac_ext_bus_link_power_down_all(struct hdac_ext_bus *ebus)
+{
+ struct hdac_ext_link *hlink = NULL;
+ int ret;
+
+ list_for_each_entry(hlink, &ebus->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);
Code Review / kvmfornfv.git / blobdiff