| Ramesh Babu | 6eee872 | 2016-05-30 17:42:55 +0530 | [diff] [blame] | 1 | /* |
| 2 | * skl-sst-utils.c - SKL sst utils functions |
| 3 | * |
| 4 | * Copyright (C) 2016 Intel Corp |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as version 2, as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, but |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * General Public License for more details. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/firmware.h> |
| 17 | #include "skl-sst-dsp.h" |
| 18 | |
| 19 | /* FW Extended Manifest Header id = $AE1 */ |
| 20 | #define SKL_EXT_MANIFEST_HEADER_MAGIC 0x31454124 |
| 21 | |
| 22 | struct skl_ext_manifest_hdr { |
| 23 | u32 id; |
| 24 | u32 len; |
| 25 | u16 version_major; |
| 26 | u16 version_minor; |
| 27 | u32 entries; |
| 28 | }; |
| 29 | |
| 30 | /* |
| 31 | * some firmware binary contains some extended manifest. This needs |
| 32 | * to be stripped in that case before we load and use that image. |
| 33 | * |
| 34 | * So check for magic header, if found strip the header |
| 35 | */ |
| 36 | int skl_dsp_strip_extended_manifest(struct firmware *fw) |
| 37 | { |
| 38 | struct skl_ext_manifest_hdr *hdr; |
| 39 | |
| 40 | /* check if fw file is greater than header we are looking */ |
| 41 | if (fw->size < sizeof(hdr)) { |
| 42 | pr_err("%s: Firmware file small, no hdr\n", __func__); |
| 43 | return -EINVAL; |
| 44 | } |
| 45 | |
| 46 | hdr = (struct skl_ext_manifest_hdr *)fw->data; |
| 47 | |
| 48 | if (hdr->id == SKL_EXT_MANIFEST_HEADER_MAGIC) { |
| 49 | fw->size -= hdr->len; |
| 50 | fw->data += hdr->len; |
| 51 | } |
| 52 | |
| 53 | return 0; |
| 54 | } |