1 files changed, 140 insertions, 0 deletions
diff --git a/sound/soc/intel/skylake/skl-nhlt.c b/sound/soc/intel/skylake/skl-nhlt.c
new file mode 100644
index 000000000..13036b19d
--- /dev/null
+++ b/sound/soc/intel/skylake/skl-nhlt.c
@@ -0,0 +1,140 @@
+/*
+ *  skl-nhlt.c - Intel SKL Platform NHLT parsing
+ *
+ *  Copyright (C) 2015 Intel Corp
+ *  Author: Sanjiv Kumar <sanjiv.kumar@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 "skl.h"
+
+/* Unique identification for getting NHLT blobs */
+static u8 OSC_UUID[16] = {0x6E, 0x88, 0x9F, 0xA6, 0xEB, 0x6C, 0x94, 0x45,
+				0xA4, 0x1F, 0x7B, 0x5D, 0xCE, 0x24, 0xC5, 0x53};
+
+#define DSDT_NHLT_PATH "\\_SB.PCI0.HDAS"
+
+void __iomem *skl_nhlt_init(struct device *dev)
+{
+	acpi_handle handle;
+	union acpi_object *obj;
+	struct nhlt_resource_desc  *nhlt_ptr = NULL;
+
+	if (ACPI_FAILURE(acpi_get_handle(NULL, DSDT_NHLT_PATH, &handle))) {
+		dev_err(dev, "Requested NHLT device not found\n");
+		return NULL;
+	}
+
+	obj = acpi_evaluate_dsm(handle, OSC_UUID, 1, 1, NULL);
+	if (obj && obj->type == ACPI_TYPE_BUFFER) {
+		nhlt_ptr = (struct nhlt_resource_desc  *)obj->buffer.pointer;
+
+		return ioremap_cache(nhlt_ptr->min_addr, nhlt_ptr->length);
+	}
+
+	dev_err(dev, "device specific method to extract NHLT blob failed\n");
+	return NULL;
+}
+
+void skl_nhlt_free(void __iomem *addr)
+{
+	iounmap(addr);
+	addr = NULL;
+}
+
+static struct nhlt_specific_cfg *skl_get_specific_cfg(
+		struct device *dev, struct nhlt_fmt *fmt,
+		u8 no_ch, u32 rate, u16 bps)
+{
+	struct nhlt_specific_cfg *sp_config;
+	struct wav_fmt *wfmt;
+	struct nhlt_fmt_cfg *fmt_config = fmt->fmt_config;
+	int i;
+
+	dev_dbg(dev, "Format count =%d\n", fmt->fmt_count);
+
+	for (i = 0; i < fmt->fmt_count; i++) {
+		wfmt = &fmt_config->fmt_ext.fmt;
+		dev_dbg(dev, "ch=%d fmt=%d s_rate=%d\n", wfmt->channels,
+			 wfmt->bits_per_sample, wfmt->samples_per_sec);
+		if (wfmt->channels == no_ch && wfmt->samples_per_sec == rate &&
+					wfmt->bits_per_sample == bps) {
+			sp_config = &fmt_config->config;
+
+			return sp_config;
+		}
+
+		fmt_config = (struct nhlt_fmt_cfg *)(fmt_config->config.caps +
+						fmt_config->config.size);
+	}
+
+	return NULL;
+}
+
+static void dump_config(struct device *dev, u32 instance_id, u8 linktype,
+		u8 s_fmt, u8 num_channels, u32 s_rate, u8 dirn, u16 bps)
+{
+	dev_dbg(dev, "Input configuration\n");
+	dev_dbg(dev, "ch=%d fmt=%d s_rate=%d\n", num_channels, s_fmt, s_rate);
+	dev_dbg(dev, "vbus_id=%d link_type=%d\n", instance_id, linktype);
+	dev_dbg(dev, "bits_per_sample=%d\n", bps);
+}
+
+static bool skl_check_ep_match(struct device *dev, struct nhlt_endpoint *epnt,
+				u32 instance_id, u8 link_type, u8 dirn)
+{
+	dev_dbg(dev, "vbus_id=%d link_type=%d dir=%d\n",
+		epnt->virtual_bus_id, epnt->linktype, epnt->direction);
+
+	if ((epnt->virtual_bus_id == instance_id) &&
+			(epnt->linktype == link_type) &&
+			(epnt->direction == dirn))
+		return true;
+	else
+		return false;
+}
+
+struct nhlt_specific_cfg
+*skl_get_ep_blob(struct skl *skl, u32 instance, u8 link_type,
+			u8 s_fmt, u8 num_ch, u32 s_rate, u8 dirn)
+{
+	struct nhlt_fmt *fmt;
+	struct nhlt_endpoint *epnt;
+	struct hdac_bus *bus = ebus_to_hbus(&skl->ebus);
+	struct device *dev = bus->dev;
+	struct nhlt_specific_cfg *sp_config;
+	struct nhlt_acpi_table *nhlt = (struct nhlt_acpi_table *)skl->nhlt;
+	u16 bps = num_ch * s_fmt;
+	u8 j;
+
+	dump_config(dev, instance, link_type, s_fmt, num_ch, s_rate, dirn, bps);
+
+	epnt = (struct nhlt_endpoint *)nhlt->desc;
+
+	dev_dbg(dev, "endpoint count =%d\n", nhlt->endpoint_count);
+
+	for (j = 0; j < nhlt->endpoint_count; j++) {
+		if (skl_check_ep_match(dev, epnt, instance, link_type, dirn)) {
+			fmt = (struct nhlt_fmt *)(epnt->config.caps +
+						 epnt->config.size);
+			sp_config = skl_get_specific_cfg(dev, fmt, num_ch, s_rate, bps);
+			if (sp_config)
+				return sp_config;
+		}
+
+		epnt = (struct nhlt_endpoint *)((u8 *)epnt + epnt->length);
+	}
+
+	return NULL;
+}