mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
88 lines
2.4 KiB
88 lines
2.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
// |
|
// Freescale ALSA SoC Machine driver utility |
|
// |
|
// Author: Timur Tabi <[email protected]> |
|
// |
|
// Copyright 2010 Freescale Semiconductor, Inc. |
|
|
|
#include <linux/module.h> |
|
#include <linux/of_address.h> |
|
#include <sound/soc.h> |
|
|
|
#include "fsl_utils.h" |
|
|
|
/** |
|
* fsl_asoc_get_dma_channel - determine the dma channel for a SSI node |
|
* |
|
* @ssi_np: pointer to the SSI device tree node |
|
* @name: name of the phandle pointing to the dma channel |
|
* @dai: ASoC DAI link pointer to be filled with platform_name |
|
* @dma_channel_id: dma channel id to be returned |
|
* @dma_id: dma id to be returned |
|
* |
|
* This function determines the dma and channel id for given SSI node. It |
|
* also discovers the platform_name for the ASoC DAI link. |
|
*/ |
|
int fsl_asoc_get_dma_channel(struct device_node *ssi_np, |
|
const char *name, |
|
struct snd_soc_dai_link *dai, |
|
unsigned int *dma_channel_id, |
|
unsigned int *dma_id) |
|
{ |
|
struct resource res; |
|
struct device_node *dma_channel_np, *dma_np; |
|
const __be32 *iprop; |
|
int ret; |
|
|
|
dma_channel_np = of_parse_phandle(ssi_np, name, 0); |
|
if (!dma_channel_np) |
|
return -EINVAL; |
|
|
|
if (!of_device_is_compatible(dma_channel_np, "fsl,ssi-dma-channel")) { |
|
of_node_put(dma_channel_np); |
|
return -EINVAL; |
|
} |
|
|
|
/* Determine the dev_name for the device_node. This code mimics the |
|
* behavior of of_device_make_bus_id(). We need this because ASoC uses |
|
* the dev_name() of the device to match the platform (DMA) device with |
|
* the CPU (SSI) device. It's all ugly and hackish, but it works (for |
|
* now). |
|
* |
|
* dai->platform name should already point to an allocated buffer. |
|
*/ |
|
ret = of_address_to_resource(dma_channel_np, 0, &res); |
|
if (ret) { |
|
of_node_put(dma_channel_np); |
|
return ret; |
|
} |
|
snprintf((char *)dai->platforms->name, DAI_NAME_SIZE, "%llx.%pOFn", |
|
(unsigned long long) res.start, dma_channel_np); |
|
|
|
iprop = of_get_property(dma_channel_np, "cell-index", NULL); |
|
if (!iprop) { |
|
of_node_put(dma_channel_np); |
|
return -EINVAL; |
|
} |
|
*dma_channel_id = be32_to_cpup(iprop); |
|
|
|
dma_np = of_get_parent(dma_channel_np); |
|
iprop = of_get_property(dma_np, "cell-index", NULL); |
|
if (!iprop) { |
|
of_node_put(dma_np); |
|
of_node_put(dma_channel_np); |
|
return -EINVAL; |
|
} |
|
*dma_id = be32_to_cpup(iprop); |
|
|
|
of_node_put(dma_np); |
|
of_node_put(dma_channel_np); |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL(fsl_asoc_get_dma_channel); |
|
|
|
MODULE_AUTHOR("Timur Tabi <[email protected]>"); |
|
MODULE_DESCRIPTION("Freescale ASoC utility code"); |
|
MODULE_LICENSE("GPL v2");
|
|
|