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/*
* 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;
}
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