1/*
2 *  skl-nhlt.c - Intel SKL Platform NHLT parsing
3 *
4 *  Copyright (C) 2015 Intel Corp
5 *  Author: Sanjiv Kumar <sanjiv.kumar@intel.com>
6 *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7 *
8 *  This program is free software; you can redistribute it and/or modify
9 *  it under the terms of the GNU General Public License as published by
10 *  the Free Software Foundation; version 2 of the License.
11 *
12 *  This program is distributed in the hope that it will be useful, but
13 *  WITHOUT ANY WARRANTY; without even the implied warranty of
14 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 *  General Public License for more details.
16 *
17 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
18 *
19 */
20#include "skl.h"
21
22/* Unique identification for getting NHLT blobs */
23static u8 OSC_UUID[16] = {0x6E, 0x88, 0x9F, 0xA6, 0xEB, 0x6C, 0x94, 0x45,
24				0xA4, 0x1F, 0x7B, 0x5D, 0xCE, 0x24, 0xC5, 0x53};
25
26#define DSDT_NHLT_PATH "\\_SB.PCI0.HDAS"
27
28void *skl_nhlt_init(struct device *dev)
29{
30	acpi_handle handle;
31	union acpi_object *obj;
32	struct nhlt_resource_desc  *nhlt_ptr = NULL;
33
34	if (ACPI_FAILURE(acpi_get_handle(NULL, DSDT_NHLT_PATH, &handle))) {
35		dev_err(dev, "Requested NHLT device not found\n");
36		return NULL;
37	}
38
39	obj = acpi_evaluate_dsm(handle, OSC_UUID, 1, 1, NULL);
40	if (obj && obj->type == ACPI_TYPE_BUFFER) {
41		nhlt_ptr = (struct nhlt_resource_desc  *)obj->buffer.pointer;
42
43		return memremap(nhlt_ptr->min_addr, nhlt_ptr->length,
44				MEMREMAP_WB);
45	}
46
47	dev_err(dev, "device specific method to extract NHLT blob failed\n");
48	return NULL;
49}
50
51void skl_nhlt_free(void *addr)
52{
53	memunmap(addr);
54}
55
56static struct nhlt_specific_cfg *skl_get_specific_cfg(
57		struct device *dev, struct nhlt_fmt *fmt,
58		u8 no_ch, u32 rate, u16 bps)
59{
60	struct nhlt_specific_cfg *sp_config;
61	struct wav_fmt *wfmt;
62	struct nhlt_fmt_cfg *fmt_config = fmt->fmt_config;
63	int i;
64
65	dev_dbg(dev, "Format count =%d\n", fmt->fmt_count);
66
67	for (i = 0; i < fmt->fmt_count; i++) {
68		wfmt = &fmt_config->fmt_ext.fmt;
69		dev_dbg(dev, "ch=%d fmt=%d s_rate=%d\n", wfmt->channels,
70			 wfmt->bits_per_sample, wfmt->samples_per_sec);
71		if (wfmt->channels == no_ch && wfmt->samples_per_sec == rate &&
72					wfmt->bits_per_sample == bps) {
73			sp_config = &fmt_config->config;
74
75			return sp_config;
76		}
77
78		fmt_config = (struct nhlt_fmt_cfg *)(fmt_config->config.caps +
79						fmt_config->config.size);
80	}
81
82	return NULL;
83}
84
85static void dump_config(struct device *dev, u32 instance_id, u8 linktype,
86		u8 s_fmt, u8 num_channels, u32 s_rate, u8 dirn, u16 bps)
87{
88	dev_dbg(dev, "Input configuration\n");
89	dev_dbg(dev, "ch=%d fmt=%d s_rate=%d\n", num_channels, s_fmt, s_rate);
90	dev_dbg(dev, "vbus_id=%d link_type=%d\n", instance_id, linktype);
91	dev_dbg(dev, "bits_per_sample=%d\n", bps);
92}
93
94static bool skl_check_ep_match(struct device *dev, struct nhlt_endpoint *epnt,
95				u32 instance_id, u8 link_type, u8 dirn)
96{
97	dev_dbg(dev, "vbus_id=%d link_type=%d dir=%d\n",
98		epnt->virtual_bus_id, epnt->linktype, epnt->direction);
99
100	if ((epnt->virtual_bus_id == instance_id) &&
101			(epnt->linktype == link_type) &&
102			(epnt->direction == dirn))
103		return true;
104	else
105		return false;
106}
107
108struct nhlt_specific_cfg
109*skl_get_ep_blob(struct skl *skl, u32 instance, u8 link_type,
110			u8 s_fmt, u8 num_ch, u32 s_rate, u8 dirn)
111{
112	struct nhlt_fmt *fmt;
113	struct nhlt_endpoint *epnt;
114	struct hdac_bus *bus = ebus_to_hbus(&skl->ebus);
115	struct device *dev = bus->dev;
116	struct nhlt_specific_cfg *sp_config;
117	struct nhlt_acpi_table *nhlt = (struct nhlt_acpi_table *)skl->nhlt;
118	u16 bps = num_ch * s_fmt;
119	u8 j;
120
121	dump_config(dev, instance, link_type, s_fmt, num_ch, s_rate, dirn, bps);
122
123	epnt = (struct nhlt_endpoint *)nhlt->desc;
124
125	dev_dbg(dev, "endpoint count =%d\n", nhlt->endpoint_count);
126
127	for (j = 0; j < nhlt->endpoint_count; j++) {
128		if (skl_check_ep_match(dev, epnt, instance, link_type, dirn)) {
129			fmt = (struct nhlt_fmt *)(epnt->config.caps +
130						 epnt->config.size);
131			sp_config = skl_get_specific_cfg(dev, fmt, num_ch, s_rate, bps);
132			if (sp_config)
133				return sp_config;
134		}
135
136		epnt = (struct nhlt_endpoint *)((u8 *)epnt + epnt->length);
137	}
138
139	return NULL;
140}
141