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ASoC: Intel: Skylake: Add strip extended manifest utility

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Some upcoming platforms like broxton etc have extended manifest
in firmware binary. This is not required to be downloaded to DSP.
So driver needs to strip this before downloading.

Add a utility function to check if a header exists, and remove it
in that case

Signed-off-by: Ramesh Babu <ramesh.babu@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Ramesh Babu 2016-05-30 17:42:55 +05:30 committed by Mark Brown
parent f65cf7d666
commit 6eee87261f
3 changed files with 57 additions and 1 deletions
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2
sound/soc/intel/skylake/Makefile
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@ -5,6 +5,6 @@ obj-$(CONFIG_SND_SOC_INTEL_SKYLAKE) += snd-soc-skl.o
# Skylake IPC Support
snd-soc-skl-ipc-objs := skl-sst-ipc.o skl-sst-dsp.o skl-sst-cldma.o \
skl-sst.o bxt-sst.o
skl-sst.o bxt-sst.o skl-sst-utils.o
obj-$(CONFIG_SND_SOC_INTEL_SKYLAKE) += snd-soc-skl-ipc.o

2
sound/soc/intel/skylake/skl-sst-dsp.h
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@ -175,4 +175,6 @@ int bxt_sst_dsp_init(struct device *dev, void __iomem *mmio_base, int irq,
void skl_sst_dsp_cleanup(struct device *dev, struct skl_sst *ctx);
void bxt_sst_dsp_cleanup(struct device *dev, struct skl_sst *ctx);
int skl_dsp_strip_extended_manifest(struct firmware *fw);
#endif /*__SKL_SST_DSP_H__*/

54
sound/soc/intel/skylake/skl-sst-utils.c Normal file
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@ -0,0 +1,54 @@
/*
* skl-sst-utils.c - SKL sst utils functions
*
* Copyright (C) 2016 Intel Corp
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as version 2, as
* published by the Free Software Foundation.
*
* 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/firmware.h>
#include "skl-sst-dsp.h"
/* FW Extended Manifest Header id = $AE1 */
#define SKL_EXT_MANIFEST_HEADER_MAGIC 0x31454124
struct skl_ext_manifest_hdr {
u32 id;
u32 len;
u16 version_major;
u16 version_minor;
u32 entries;
};
/*
* some firmware binary contains some extended manifest. This needs
* to be stripped in that case before we load and use that image.
*
* So check for magic header, if found strip the header
*/
int skl_dsp_strip_extended_manifest(struct firmware *fw)
{
struct skl_ext_manifest_hdr *hdr;
/* check if fw file is greater than header we are looking */
if (fw->size < sizeof(hdr)) {
pr_err("%s: Firmware file small, no hdr\n", __func__);
return -EINVAL;
}
hdr = (struct skl_ext_manifest_hdr *)fw->data;
if (hdr->id == SKL_EXT_MANIFEST_HEADER_MAGIC) {
fw->size -= hdr->len;
fw->data += hdr->len;
}
return 0;
}