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// SPDX-License-Identifier: GPL-2.0
//
// Freescale ALSA SoC Machine driver utility
//
// Author: Timur Tabi <timur@freescale.com>
//
// Copyright 2010 Freescale Semiconductor, Inc.
#include <linux/clk.h>
#include <linux/clk-provider.h>
#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);
/**
* fsl_asoc_get_pll_clocks - get two PLL clock source
*
* @dev: device pointer
* @pll8k_clk: PLL clock pointer for 8kHz
* @pll11k_clk: PLL clock pointer for 11kHz
*
* This function get two PLL clock source
*/
void fsl_asoc_get_pll_clocks(struct device *dev, struct clk **pll8k_clk,
struct clk **pll11k_clk)
{
*pll8k_clk = devm_clk_get(dev, "pll8k");
if (IS_ERR(*pll8k_clk))
*pll8k_clk = NULL;
*pll11k_clk = devm_clk_get(dev, "pll11k");
if (IS_ERR(*pll11k_clk))
*pll11k_clk = NULL;
}
EXPORT_SYMBOL(fsl_asoc_get_pll_clocks);
/**
* fsl_asoc_reparent_pll_clocks - set clock parent if necessary
*
* @dev: device pointer
* @clk: root clock pointer
* @pll8k_clk: PLL clock pointer for 8kHz
* @pll11k_clk: PLL clock pointer for 11kHz
* @ratio: target requency for root clock
*
* This function set root clock parent according to the target ratio
*/
void fsl_asoc_reparent_pll_clocks(struct device *dev, struct clk *clk,
struct clk *pll8k_clk,
struct clk *pll11k_clk, u64 ratio)
{
struct clk *p, *pll = NULL, *npll = NULL;
bool reparent = false;
int ret = 0;
if (!clk || !pll8k_clk || !pll11k_clk)
return;
p = clk;
while (p && pll8k_clk && pll11k_clk) {
struct clk *pp = clk_get_parent(p);
if (clk_is_match(pp, pll8k_clk) ||
clk_is_match(pp, pll11k_clk)) {
pll = pp;
break;
}
p = pp;
}
npll = (do_div(ratio, 8000) ? pll11k_clk : pll8k_clk);
reparent = (pll && !clk_is_match(pll, npll));
if (reparent) {
ret = clk_set_parent(p, npll);
if (ret < 0)
dev_warn(dev, "failed to set parent:%d\n", ret);
}
}
EXPORT_SYMBOL(fsl_asoc_reparent_pll_clocks);
MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
MODULE_DESCRIPTION("Freescale ASoC utility code");
MODULE_LICENSE("GPL v2");
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