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

   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
  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
  51 void skl_nhlt_free(void *addr)
  52 {
  53         memunmap(addr);
  54 }
  55
  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
  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
  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
 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 }