ASoC: Intel: Skylake: Add NHLT support to get BE config

The Non-HD Audio Endpoint Description table contains the link
configuration information for the DSP. This is specific to Non HDA
links only, like I2s and PDM

Skylake driver will use NHLT table to retrieve the configuration based
on the link type, format, channel and rate. This configuration is
passed to DSP FW

Signed-off-by: Jeeja KP <jeeja.kp@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/skylake/skl-nhlt.c

@@ -0,0 +1,141 @@
+/*
+ *  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 <linux/acpi.h>
+#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, u8 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;
+}