shdma: add R-Car Audio DMAC peri peri driver (e43a34e3) · Commits · e / devices / android_kernel_fairphone_FP3

drivers/dma/sh/Kconfig

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		@@ -29,6 +29,12 @@ config RCAR_HPB_DMAE
		help
		Enable support for the Renesas R-Car series DMA controllers.

		config RCAR_AUDMAC_PP
		tristate "Renesas R-Car Audio DMAC Peripheral Peripheral support"
		depends on SH_DMAE_BASE
		help
		Enable support for the Renesas R-Car Audio DMAC Peripheral Peripheral controllers.

		config SHDMA_R8A73A4
		def_bool y
		depends on ARCH_R8A73A4 && SH_DMAE != n

drivers/dma/sh/Makefile

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		@@ -7,3 +7,4 @@ endif
		shdma-objs := $(shdma-y)
		obj-$(CONFIG_SUDMAC) += sudmac.o
		obj-$(CONFIG_RCAR_HPB_DMAE) += rcar-hpbdma.o
		obj-$(CONFIG_RCAR_AUDMAC_PP) += rcar-audmapp.o

drivers/dma/sh/rcar-audmapp.c

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		/*
		* This is for Renesas R-Car Audio-DMAC-peri-peri.
		*
		* Copyright (C) 2014 Renesas Electronics Corporation
		* Copyright (C) 2014 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
		*
		* based on the drivers/dma/sh/shdma.c
		*
		* Copyright (C) 2011-2012 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
		* Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
		* Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
		* Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
		*
		* This 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.
		*
		*/
		#include <linux/delay.h>
		#include <linux/init.h>
		#include <linux/module.h>
		#include <linux/slab.h>
		#include <linux/dmaengine.h>
		#include <linux/platform_data/dma-rcar-audmapp.h>
		#include <linux/platform_device.h>
		#include <linux/shdma-base.h>

		/*
		* DMA register
		*/
		#define PDMASAR 0x00
		#define PDMADAR 0x04
		#define PDMACHCR 0x0c

		/* PDMACHCR */
		#define PDMACHCR_DE (1 << 0)

		#define AUDMAPP_MAX_CHANNELS 29

		/* Default MEMCPY transfer size = 2^2 = 4 bytes */
		#define LOG2_DEFAULT_XFER_SIZE 2
		#define AUDMAPP_SLAVE_NUMBER 256
		#define AUDMAPP_LEN_MAX (16 * 1024 * 1024)

		struct audmapp_chan {
		struct shdma_chan shdma_chan;
		struct audmapp_slave_config *config;
		void __iomem *base;
		};

		struct audmapp_device {
		struct shdma_dev shdma_dev;
		struct audmapp_pdata *pdata;
		struct device *dev;
		void __iomem *chan_reg;
		};

		#define to_chan(chan) container_of(chan, struct audmapp_chan, shdma_chan)
		#define to_dev(chan) container_of(chan->shdma_chan.dma_chan.device, \
		struct audmapp_device, shdma_dev.dma_dev)

		static void audmapp_write(struct audmapp_chan *auchan, u32 data, u32 reg)
		{
		struct audmapp_device *audev = to_dev(auchan);
		struct device *dev = audev->dev;

		dev_dbg(dev, "w %p : %08x\n", auchan->base + reg, data);

		iowrite32(data, auchan->base + reg);
		}

		static u32 audmapp_read(struct audmapp_chan *auchan, u32 reg)
		{
		return ioread32(auchan->base + reg);
		}

		static void audmapp_halt(struct shdma_chan *schan)
		{
		struct audmapp_chan *auchan = to_chan(schan);
		int i;

		audmapp_write(auchan, 0, PDMACHCR);

		for (i = 0; i < 1024; i++) {
		if (0 == audmapp_read(auchan, PDMACHCR))
		return;
		udelay(1);
		}
		}

		static void audmapp_start_xfer(struct shdma_chan *schan,
		struct shdma_desc *sdecs)
		{
		struct audmapp_chan *auchan = to_chan(schan);
		struct audmapp_device *audev = to_dev(auchan);
		struct audmapp_slave_config *cfg = auchan->config;
		struct device *dev = audev->dev;
		u32 chcr = cfg->chcr \| PDMACHCR_DE;

		dev_dbg(dev, "src/dst/chcr = %pad/%pad/%x\n",
		&cfg->src, &cfg->dst, cfg->chcr);

		audmapp_write(auchan, cfg->src, PDMASAR);
		audmapp_write(auchan, cfg->dst, PDMADAR);
		audmapp_write(auchan, chcr, PDMACHCR);
		}

		static struct audmapp_slave_config *
		audmapp_find_slave(struct audmapp_chan *auchan, int slave_id)
		{
		struct audmapp_device *audev = to_dev(auchan);
		struct audmapp_pdata *pdata = audev->pdata;
		struct audmapp_slave_config *cfg;
		int i;

		if (slave_id >= AUDMAPP_SLAVE_NUMBER)
		return NULL;

		for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++)
		if (cfg->slave_id == slave_id)
		return cfg;

		return NULL;
		}

		static int audmapp_set_slave(struct shdma_chan *schan, int slave_id,
		dma_addr_t slave_addr, bool try)
		{
		struct audmapp_chan *auchan = to_chan(schan);
		struct audmapp_slave_config *cfg =
		audmapp_find_slave(auchan, slave_id);

		if (!cfg)
		return -ENODEV;
		if (try)
		return 0;

		auchan->config = cfg;

		return 0;
		}

		static int audmapp_desc_setup(struct shdma_chan *schan,
		struct shdma_desc *sdecs,
		dma_addr_t src, dma_addr_t dst, size_t *len)
		{
		struct audmapp_chan *auchan = to_chan(schan);
		struct audmapp_slave_config *cfg = auchan->config;

		if (!cfg)
		return -ENODEV;

		if (*len > (size_t)AUDMAPP_LEN_MAX)
		*len = (size_t)AUDMAPP_LEN_MAX;

		return 0;
		}

		static void audmapp_setup_xfer(struct shdma_chan *schan,
		int slave_id)
		{
		}

		static dma_addr_t audmapp_slave_addr(struct shdma_chan *schan)
		{
		return 0; /* always fixed address */
		}

		static bool audmapp_channel_busy(struct shdma_chan *schan)
		{
		struct audmapp_chan *auchan = to_chan(schan);
		u32 chcr = audmapp_read(auchan, PDMACHCR);

		return chcr & ~PDMACHCR_DE;
		}

		static bool audmapp_desc_completed(struct shdma_chan *schan,
		struct shdma_desc *sdesc)
		{
		return true;
		}

		static struct shdma_desc audmapp_embedded_desc(void buf, int i)
		{
		return &((struct shdma_desc *)buf)[i];
		}

		static const struct shdma_ops audmapp_shdma_ops = {
		.halt_channel = audmapp_halt,
		.desc_setup = audmapp_desc_setup,
		.set_slave = audmapp_set_slave,
		.start_xfer = audmapp_start_xfer,
		.embedded_desc = audmapp_embedded_desc,
		.setup_xfer = audmapp_setup_xfer,
		.slave_addr = audmapp_slave_addr,
		.channel_busy = audmapp_channel_busy,
		.desc_completed = audmapp_desc_completed,
		};

		static int audmapp_chan_probe(struct platform_device *pdev,
		struct audmapp_device *audev, int id)
		{
		struct shdma_dev *sdev = &audev->shdma_dev;
		struct audmapp_chan *auchan;
		struct shdma_chan *schan;
		struct device *dev = audev->dev;

		auchan = devm_kzalloc(dev, sizeof(*auchan), GFP_KERNEL);
		if (!auchan)
		return -ENOMEM;

		schan = &auchan->shdma_chan;
		schan->max_xfer_len = AUDMAPP_LEN_MAX;

		shdma_chan_probe(sdev, schan, id);

		auchan->base = audev->chan_reg + 0x20 + (0x10 * id);
		dev_dbg(dev, "%02d : %p / %p", id, auchan->base, audev->chan_reg);

		return 0;
		}

		static void audmapp_chan_remove(struct audmapp_device *audev)
		{
		struct dma_device *dma_dev = &audev->shdma_dev.dma_dev;
		struct shdma_chan *schan;
		int i;

		shdma_for_each_chan(schan, &audev->shdma_dev, i) {
		BUG_ON(!schan);
		shdma_chan_remove(schan);
		}
		dma_dev->chancnt = 0;
		}

		static int audmapp_probe(struct platform_device *pdev)
		{
		struct audmapp_pdata *pdata = pdev->dev.platform_data;
		struct audmapp_device *audev;
		struct shdma_dev *sdev;
		struct dma_device *dma_dev;
		struct resource *res;
		int err, i;

		if (!pdata)
		return -ENODEV;

		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

		audev = devm_kzalloc(&pdev->dev, sizeof(*audev), GFP_KERNEL);
		if (!audev)
		return -ENOMEM;

		audev->dev = &pdev->dev;
		audev->pdata = pdata;
		audev->chan_reg = devm_ioremap_resource(&pdev->dev, res);
		if (IS_ERR(audev->chan_reg))
		return PTR_ERR(audev->chan_reg);

		sdev = &audev->shdma_dev;
		sdev->ops = &audmapp_shdma_ops;
		sdev->desc_size = sizeof(struct shdma_desc);

		dma_dev = &sdev->dma_dev;
		dma_dev->copy_align = LOG2_DEFAULT_XFER_SIZE;
		dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);

		err = shdma_init(&pdev->dev, sdev, AUDMAPP_MAX_CHANNELS);
		if (err < 0)
		return err;

		platform_set_drvdata(pdev, audev);

		/* Create DMA Channel */
		for (i = 0; i < AUDMAPP_MAX_CHANNELS; i++) {
		err = audmapp_chan_probe(pdev, audev, i);
		if (err)
		goto chan_probe_err;
		}

		err = dma_async_device_register(dma_dev);
		if (err < 0)
		goto chan_probe_err;

		return err;

		chan_probe_err:
		audmapp_chan_remove(audev);
		shdma_cleanup(sdev);

		return err;
		}

		static int audmapp_remove(struct platform_device *pdev)
		{
		struct audmapp_device *audev = platform_get_drvdata(pdev);
		struct dma_device *dma_dev = &audev->shdma_dev.dma_dev;

		dma_async_device_unregister(dma_dev);

		audmapp_chan_remove(audev);
		shdma_cleanup(&audev->shdma_dev);

		return 0;
		}

		static struct platform_driver audmapp_driver = {
		.probe = audmapp_probe,
		.remove = audmapp_remove,
		.driver = {
		.owner = THIS_MODULE,
		.name = "rcar-audmapp-engine",
		},
		};
		module_platform_driver(audmapp_driver);

		MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
		MODULE_DESCRIPTION("Renesas R-Car Audio DMAC peri-peri driver");
		MODULE_LICENSE("GPL");

include/linux/platform_data/dma-rcar-audmapp.h

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		/*
		* This is for Renesas R-Car Audio-DMAC-peri-peri.
		*
		* Copyright (C) 2014 Renesas Electronics Corporation
		* Copyright (C) 2014 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
		*
		* This file is based on the include/linux/sh_dma.h
		*
		* Header for the new SH dmaengine driver
		*
		* Copyright (C) 2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 as
		* published by the Free Software Foundation.
		*/
		#ifndef SH_AUDMAPP_H
		#define SH_AUDMAPP_H

		#include <linux/dmaengine.h>

		struct audmapp_slave_config {
		int slave_id;
		dma_addr_t src;
		dma_addr_t dst;
		u32 chcr;
		};

		struct audmapp_pdata {
		struct audmapp_slave_config *slave;
		int slave_num;
		};

		#endif /* SH_AUDMAPP_H */