/*
 * pxa-ssp.c  --  ALSA Soc Audio Layer
 *
 * Copyright 2005,2008 Wolfson Microelectronics PLC.
 * Author: Liam Girdwood
 *         Mark Brown <broonie@opensource.wolfsonmicro.com>
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 * TODO:
 *  o Test network mode for > 16bit sample size
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/pxa2xx_ssp.h>
#include <linux/of.h>
#include <linux/dmaengine.h>

#include <asm/irq.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/initval.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/pxa2xx-lib.h>
#include <sound/dmaengine_pcm.h>

#include "../../arm/pxa2xx-pcm.h"
#include "pxa-ssp.h"

/*
 * SSP audio private data
 */
struct ssp_priv {
	struct ssp_device *ssp;
	unsigned int sysclk;
	int dai_fmt;
#ifdef CONFIG_PM
	uint32_t	cr0;
	uint32_t	cr1;
	uint32_t	to;
	uint32_t	psp;
#endif
};

static void dump_registers(struct ssp_device *ssp)
{
	dev_dbg(&ssp->pdev->dev, "SSCR0 0x%08x SSCR1 0x%08x SSTO 0x%08x\n",
		 pxa_ssp_read_reg(ssp, SSCR0), pxa_ssp_read_reg(ssp, SSCR1),
		 pxa_ssp_read_reg(ssp, SSTO));

	dev_dbg(&ssp->pdev->dev, "SSPSP 0x%08x SSSR 0x%08x SSACD 0x%08x\n",
		 pxa_ssp_read_reg(ssp, SSPSP), pxa_ssp_read_reg(ssp, SSSR),
		 pxa_ssp_read_reg(ssp, SSACD));
}

static void pxa_ssp_enable(struct ssp_device *ssp)
{
	uint32_t sscr0;

	sscr0 = __raw_readl(ssp->mmio_base + SSCR0) | SSCR0_SSE;
	__raw_writel(sscr0, ssp->mmio_base + SSCR0);
}

static void pxa_ssp_disable(struct ssp_device *ssp)
{
	uint32_t sscr0;

	sscr0 = __raw_readl(ssp->mmio_base + SSCR0) & ~SSCR0_SSE;
	__raw_writel(sscr0, ssp->mmio_base + SSCR0);
}

static void pxa_ssp_set_dma_params(struct ssp_device *ssp, int width4,
			int out, struct snd_dmaengine_dai_dma_data *dma)
{
	dma->addr_width = width4 ? DMA_SLAVE_BUSWIDTH_4_BYTES :
				   DMA_SLAVE_BUSWIDTH_2_BYTES;
	dma->maxburst = 16;
	dma->addr = ssp->phys_base + SSDR;
}

static int pxa_ssp_startup(struct snd_pcm_substream *substream,
			   struct snd_soc_dai *cpu_dai)
{
	struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
	struct ssp_device *ssp = priv->ssp;
	struct snd_dmaengine_dai_dma_data *dma;
	int ret = 0;

	if (!cpu_dai->active) {
		clk_prepare_enable(ssp->clk);
		pxa_ssp_disable(ssp);
	}

	dma = kzalloc(sizeof(struct snd_dmaengine_dai_dma_data), GFP_KERNEL);
	if (!dma)
		return -ENOMEM;

	dma->filter_data = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
				&ssp->drcmr_tx : &ssp->drcmr_rx;

	snd_soc_dai_set_dma_data(cpu_dai, substream, dma);

	return ret;
}

static void pxa_ssp_shutdown(struct snd_pcm_substream *substream,
			     struct snd_soc_dai *cpu_dai)
{
	struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
	struct ssp_device *ssp = priv->ssp;

	if (!cpu_dai->active) {
		pxa_ssp_disable(ssp);
		clk_disable_unprepare(ssp->clk);
	}

	kfree(snd_soc_dai_get_dma_data(cpu_dai, substream));
	snd_soc_dai_set_dma_data(cpu_dai, substream, NULL);
}

#ifdef CONFIG_PM

static int pxa_ssp_suspend(struct snd_soc_dai *cpu_dai)
{
	struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
	struct ssp_device *ssp = priv->ssp;

	if (!cpu_dai->active)
		clk_prepare_enable(ssp->clk);

	priv->cr0 = __raw_readl(ssp->mmio_base + SSCR0);
	priv->cr1 = __raw_readl(ssp->mmio_base + SSCR1);
	priv->to  = __raw_readl(ssp->mmio_base + SSTO);
	priv->psp = __raw_readl(ssp->mmio_base + SSPSP);

	pxa_ssp_disable(ssp);
	clk_disable_unprepare(ssp->clk);
	return 0;
}

static int pxa_ssp_resume(struct snd_soc_dai *cpu_dai)
{
	struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
	struct ssp_device *ssp = priv->ssp;
	uint32_t sssr = SSSR_ROR | SSSR_TUR | SSSR_BCE;

	clk_prepare_enable(ssp->clk);

	__raw_writel(sssr, ssp->mmio_base + SSSR);
	__raw_writel(priv->cr0 & ~SSCR0_SSE, ssp->mmio_base + SSCR0);
	__raw_writel(priv->cr1, ssp->mmio_base + SSCR1);
	__raw_writel(priv->to,  ssp->mmio_base + SSTO);
	__raw_writel(priv->psp, ssp->mmio_base + SSPSP);

	if (cpu_dai->active)
		pxa_ssp_enable(ssp);
	else
		clk_disable_unprepare(ssp->clk);

	return 0;
}

#else
#define pxa_ssp_suspend	NULL
#define pxa_ssp_resume	NULL
#endif

/**
 * ssp_set_clkdiv - set SSP clock divider
 * @div: serial clock rate divider
 */
static void pxa_ssp_set_scr(struct ssp_device *ssp, u32 div)
{
	u32 sscr0 = pxa_ssp_read_reg(ssp, SSCR0);

	if (ssp->type == PXA25x_SSP) {
		sscr0 &= ~0x0000ff00;
		sscr0 |= ((div - 2)/2) << 8; /* 2..512 */
	} else {
		sscr0 &= ~0x000fff00;
		sscr0 |= (div - 1) << 8;     /* 1..4096 */
	}
	pxa_ssp_write_reg(ssp, SSCR0, sscr0);
}

/**
 * pxa_ssp_get_clkdiv - get SSP clock divider
 */
static u32 pxa_ssp_get_scr(struct ssp_device *ssp)
{
	u32 sscr0 = pxa_ssp_read_reg(ssp, SSCR0);
	u32 div;

	if (ssp->type == PXA25x_SSP)
		div = ((sscr0 >> 8) & 0xff) * 2 + 2;
	else
		div = ((sscr0 >> 8) & 0xfff) + 1;
	return div;
}

/*
 * Set the SSP ports SYSCLK.
 */
static int pxa_ssp_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
	int clk_id, unsigned int freq, int dir)
{
	struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
	struct ssp_device *ssp = priv->ssp;
	int val;

	u32 sscr0 = pxa_ssp_read_reg(ssp, SSCR0) &
		~(SSCR0_ECS |  SSCR0_NCS | SSCR0_MOD | SSCR0_ACS);

	dev_dbg(&ssp->pdev->dev,
		"pxa_ssp_set_dai_sysclk id: %d, clk_id %d, freq %u\n",
		cpu_dai->id, clk_id, freq);

	switch (clk_id) {
	case PXA_SSP_CLK_NET_PLL:
		sscr0 |= SSCR0_MOD;
		break;
	case PXA_SSP_CLK_PLL:
		/* Internal PLL is fixed */
		if (ssp->type == PXA25x_SSP)
			priv->sysclk = 1843200;
		else
			priv->sysclk = 13000000;
		break;
	case PXA_SSP_CLK_EXT:
		priv->sysclk = freq;
		sscr0 |= SSCR0_ECS;
		break;
	case PXA_SSP_CLK_NET:
		priv->sysclk = freq;
		sscr0 |= SSCR0_NCS | SSCR0_MOD;
		break;
	case PXA_S<style>
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</style><div class="highlight"><pre><span></span><span class="c1"># Copyright (c) 2016-2017 Intel Corporation</span>
<span class="c1">#</span>
<span class="c1"># Licensed under the Apache License, Version 2.0 (the &quot;License&quot;);</span>
<span class="c1"># you may not use this file except in compliance with the License.</span>
<span class="c1"># You may obtain a copy of the License at</span>
<span class="c1">#</span>
<span class="c1">#      http://www.apache.org/licenses/LICENSE-2.0</span>
<span class="c1">#</span>
<span class="c1"># Unless required by applicable law or agreed to in writing, software</span>
<span class="c1"># distributed under the License is distributed on an &quot;AS IS&quot; BASIS,</span>
<span class="c1"># WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
<span class="c1"># See the License for the specific language governing permissions and</span>
<span class="c1"># limitations under the License.</span>

<span class="k">[PIPELINE0]</span>
<span class="na">type</span> <span class="o">=</span> <span class="s">MASTER</span>
<span class="na">core</span> <span class="o">=</span> <span class="s">0</span>
<span class="k">[PIPELINE1]</span>
<span class="na">type</span> <span class="o">=</span>  <span class="s">ARPICMP</span>
<span class="na">core</span> <span class="o">=</span> <span class="s">1</span>
<span class="na">pktq_in</span>  <span class="o">=</span> <span class="s">SWQ4</span>
<span class="na">pktq_out</span> <span class="o">=</span> <span class="s">TXQ0.0 TXQ1.0 TXQ2.0 TXQ3.0</span>
<span class="na">pktq_in_prv</span> <span class="o">=</span>  <span class="s">RXQ0.0</span>
<span class="na">prv_to_pub_map</span> <span class="o">=</span> <span class="s">(0,1)</span>
<span class="k">[PIPELINE2]</span>
<span class="na">type</span> <span class="o">=</span> <span class="s">TXRX</span>
<span class="na">core</span> <span class="o">=</span> <span class="s">2</span>
<span class="na">pipeline_txrx_type</span> <span class="o">=</span> <span class="s">RXRX</span>
<span class="na">dest_if_offset</span> <span class="o">=</span> <span class="s">176</span>
<span class="na">pktq_in</span>  <span class="o">=</span> <span class="s">RXQ0.0 RXQ1.0 RXQ2.0 RXQ3.0</span>
<span class="na">pktq_out</span> <span class="o">=</span> <span class="s">SWQ0   SWQ1   SWQ2   SWQ3   SWQ4</span>
<span class="k">[PIPELINE3]</span>
<span class="na">type</span> <span class="o">=</span> <span class="s">LOADB</span>
<span class="na">core</span> <span class="o">=</span> <span class="s">3</span>
<span class="na">pktq_in</span>  <span class="o">=</span> <span class="s">SWQ0 SWQ1 SWQ2 SWQ3</span>
<span class="na">pktq_out</span> <span class="o">=</span> <span class="s">SWQ4 SWQ5 SWQ6 SWQ7 SWQ8 SWQ9 SWQ10 SWQ11</span>
<span class="na">outport_offset</span> <span class="o">=</span> <span class="s">136</span>
<span class="na">n_vnf_threads</span> <span class="o">=</span> <span class="s">2</span>
<span class="na">n_lb_tuples</span> <span class="o">=</span> <span class="s">5</span>
<span class="na">loadb_debug</span> <span class="o">=</span> <span class="s">0</span>
<span class="na">lib_arp_debug</span> <span class="o">=</span> <span class="s">0</span>
<span class="k">[PIPELINE4]</span>
<span class="na">type</span> <span class="o">=</span> <span class="s">VFW</span>
<span class="na">core</span> <span class="o">=</span> <span class="s">4</span>
<span class="na">pktq_in</span>  <span class="o">=</span> <span class="s">SWQ2 SWQ3</span>
<span class="na">pktq_out</span> <span class="o">=</span> <span class="s">SWQ4 SWQ5</span>
<span class="na">n_rules</span> <span class="o">=</span> <span class="s">10</span>
<span class="na">prv_que_handler</span> <span class="o">=</span> <span class="s">(0)</span>
<span class="na">n_flows</span> <span class="o">=</span> <span class="s">2000000</span>
<span class="na">traffic_type</span> <span class="o">=</span> <span class="s">4</span>
<span class="na">pkt_type</span> <span class="o">=</span> <span class="s">ipv4</span>
<span class="na">tcp_be_liberal</span> <span class="o">=</span> <span class="s">0</span>
<span class="k">[PIPELINE5]</span>
<span class="na">type</span> <span class="o">=</span> <span class="s">TXRX</span>
<span class="na">core</span> <span class="o">=</span> <span class="s">5</span>
<span class="na">pipeline_txrx_type</span> <span class="o">=</span> <span class="s">TXTX</span>
<span class="na">dest_if_offset</span> <span class="o">=</span> <span class="s">176</span>
<span class="na">pktq_in</span>  <span class="o">=</span> <span class="s">SWQ8 SWQ9 SWQ10 SWQ11 SWQ12 SWQ13</span>
<span class="na">pktq_out</span> <span class="o">=</span> <span class="s">TXQ0.0 TXQ1.0 TXQ0.1 TXQ1.1 TXQ0.2 TXQ1.2</span>
</pre></div>
</code></pre></td></tr></table>
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