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 */
23 static 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
skl_nhlt_init(struct device * dev)28 void *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
skl_nhlt_free(void * addr)51 void skl_nhlt_free(void *addr)
52 {
53 memunmap(addr);
54 }
55
skl_get_specific_cfg(struct device * dev,struct nhlt_fmt * fmt,u8 no_ch,u32 rate,u16 bps)56 static 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
dump_config(struct device * dev,u32 instance_id,u8 linktype,u8 s_fmt,u8 num_channels,u32 s_rate,u8 dirn,u16 bps)85 static 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
skl_check_ep_match(struct device * dev,struct nhlt_endpoint * epnt,u32 instance_id,u8 link_type,u8 dirn)94 static 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
108 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)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