mirror of
https://github.com/torvalds/linux.git
synced 2024-12-30 14:52:05 +00:00
82535314a9
This patch add fsl_asoc_xlate_tdm_slot_mask() support for utils. For the some spcified DAI driver, this will be used to generate the TDM slot TX/RX mask. And the TX/RX mask will use a 0 bit for an active slot as default, and the default active bits are at the LSB of the masks. Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com> Signed-off-by: Mark Brown <broonie@linaro.org>
119 lines
3.3 KiB
C
119 lines
3.3 KiB
C
/**
|
|
* Freescale ALSA SoC Machine driver utility
|
|
*
|
|
* Author: Timur Tabi <timur@freescale.com>
|
|
*
|
|
* Copyright 2010 Freescale Semiconductor, Inc.
|
|
*
|
|
* This file is licensed under the terms of the GNU General Public License
|
|
* version 2. This program is licensed "as is" without any warranty of any
|
|
* kind, whether express or implied.
|
|
*/
|
|
|
|
#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 u32 *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->platform_name, DAI_NAME_SIZE, "%llx.%s",
|
|
(unsigned long long) res.start, dma_channel_np->name);
|
|
|
|
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);
|
|
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);
|
|
|
|
/**
|
|
* fsl_asoc_xlate_tdm_slot_mask - generate TDM slot TX/RX mask.
|
|
*
|
|
* @slots: Number of slots in use.
|
|
* @tx_mask: bitmask representing active TX slots.
|
|
* @rx_mask: bitmask representing active RX slots.
|
|
*
|
|
* This function used to generate the TDM slot TX/RX mask. And the TX/RX
|
|
* mask will use a 0 bit for an active slot as default, and the default
|
|
* active bits are at the LSB of the mask value.
|
|
*/
|
|
int fsl_asoc_xlate_tdm_slot_mask(unsigned int slots,
|
|
unsigned int *tx_mask,
|
|
unsigned int *rx_mask)
|
|
{
|
|
if (!slots)
|
|
return -EINVAL;
|
|
|
|
if (tx_mask)
|
|
*tx_mask = ~((1 << slots) - 1);
|
|
if (rx_mask)
|
|
*rx_mask = ~((1 << slots) - 1);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fsl_asoc_xlate_tdm_slot_mask);
|
|
|
|
MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
|
|
MODULE_DESCRIPTION("Freescale ASoC utility code");
|
|
MODULE_LICENSE("GPL v2");
|