Commit 18a1053f authored by Shimoda, Yoshihiro's avatar Shimoda, Yoshihiro Committed by Vinod Koul
Browse files

sudmac: add support for SUDMAC 



Some Renesas USB modules have SUDMAC. This patch supports it using
the shdma-base driver.

Signed-off-by: default avatarYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: default avatarGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: default avatarKuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent 189b4ee8

drivers/dma/sh/Kconfig

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Original line number Diff line number Diff line
@@ -16,3 +16,9 @@ config SH_DMAE 
	depends on SH_DMAE_BASE

	help

	  Enable support for the Renesas SuperH DMA controllers.



config SUDMAC

	tristate "Renesas SUDMAC support"

	depends on SH_DMAE_BASE

	help

	  Enable support for the Renesas SUDMAC controllers.

drivers/dma/sh/Makefile

+1 −0
Original line number Diff line number Diff line 
obj-$(CONFIG_SH_DMAE_BASE) += shdma-base.o

obj-$(CONFIG_SH_DMAE) += shdma.o

obj-$(CONFIG_SUDMAC) += sudmac.o

drivers/dma/sh/sudmac.c

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/*

 * Renesas SUDMAC support

 *

 * Copyright (C) 2013 Renesas Solutions Corp.

 *

 * based on 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 version 2 of the GNU General Public License as

 * published by the Free Software Foundation.

 */



#include <linux/init.h>

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/interrupt.h>

#include <linux/dmaengine.h>

#include <linux/platform_device.h>

#include <linux/sudmac.h>



struct sudmac_chan {

	struct shdma_chan shdma_chan;

	void __iomem *base;

	char dev_id[16];	/* unique name per DMAC of channel */



	u32 offset;		/* for CFG, BA, BBC, CA, CBC, DEN */

	u32 cfg;

	u32 dint_end_bit;

};



struct sudmac_device {

	struct shdma_dev shdma_dev;

	struct sudmac_pdata *pdata;

	void __iomem *chan_reg;

};



struct sudmac_regs {

	u32 base_addr;

	u32 base_byte_count;

};



struct sudmac_desc {

	struct sudmac_regs hw;

	struct shdma_desc shdma_desc;

};



#define to_chan(schan) container_of(schan, struct sudmac_chan, shdma_chan)

#define to_desc(sdesc) container_of(sdesc, struct sudmac_desc, shdma_desc)

#define to_sdev(sc) container_of(sc->shdma_chan.dma_chan.device, \

				 struct sudmac_device, shdma_dev.dma_dev)



/* SUDMAC register */

#define SUDMAC_CH0CFG		0x00

#define SUDMAC_CH0BA		0x10

#define SUDMAC_CH0BBC		0x18

#define SUDMAC_CH0CA		0x20

#define SUDMAC_CH0CBC		0x28

#define SUDMAC_CH0DEN		0x30

#define SUDMAC_DSTSCLR		0x38

#define SUDMAC_DBUFCTRL		0x3C

#define SUDMAC_DINTCTRL		0x40

#define SUDMAC_DINTSTS		0x44

#define SUDMAC_DINTSTSCLR	0x48

#define SUDMAC_CH0SHCTRL	0x50



/* Definitions for the sudmac_channel.config */

#define SUDMAC_SENDBUFM	0x1000 /* b12: Transmit Buffer Mode */

#define SUDMAC_RCVENDM	0x0100 /* b8: Receive Data Transfer End Mode */

#define SUDMAC_LBA_WAIT	0x0030 /* b5-4: Local Bus Access Wait */



/* Definitions for the sudmac_channel.dint_end_bit */

#define SUDMAC_CH1ENDE	0x0002 /* b1: Ch1 DMA Transfer End Int Enable */

#define SUDMAC_CH0ENDE	0x0001 /* b0: Ch0 DMA Transfer End Int Enable */



#define SUDMAC_DRV_NAME "sudmac"



static void sudmac_writel(struct sudmac_chan *sc, u32 data, u32 reg)

{

	iowrite32(data, sc->base + reg);

}



static u32 sudmac_readl(struct sudmac_chan *sc, u32 reg)

{

	return ioread32(sc->base + reg);

}



static bool sudmac_is_busy(struct sudmac_chan *sc)

{

	u32 den = sudmac_readl(sc, SUDMAC_CH0DEN + sc->offset);



	if (den)

		return true; /* working */



	return false; /* waiting */

}



static void sudmac_set_reg(struct sudmac_chan *sc, struct sudmac_regs *hw,

			   struct shdma_desc *sdesc)

{

	sudmac_writel(sc, sc->cfg, SUDMAC_CH0CFG + sc->offset);

	sudmac_writel(sc, hw->base_addr, SUDMAC_CH0BA + sc->offset);

	sudmac_writel(sc, hw->base_byte_count, SUDMAC_CH0BBC + sc->offset);

}



static void sudmac_start(struct sudmac_chan *sc)

{

	u32 dintctrl = sudmac_readl(sc, SUDMAC_DINTCTRL);



	sudmac_writel(sc, dintctrl | sc->dint_end_bit, SUDMAC_DINTCTRL);

	sudmac_writel(sc, 1, SUDMAC_CH0DEN + sc->offset);

}



static void sudmac_start_xfer(struct shdma_chan *schan,

			      struct shdma_desc *sdesc)

{

	struct sudmac_chan *sc = to_chan(schan);

	struct sudmac_desc *sd = to_desc(sdesc);



	sudmac_set_reg(sc, &sd->hw, sdesc);

	sudmac_start(sc);

}



static bool sudmac_channel_busy(struct shdma_chan *schan)

{

	struct sudmac_chan *sc = to_chan(schan);



	return sudmac_is_busy(sc);

}



static void sudmac_setup_xfer(struct shdma_chan *schan, int slave_id)

{

}



static const struct sudmac_slave_config *sudmac_find_slave(

	struct sudmac_chan *sc, int slave_id)

{

	struct sudmac_device *sdev = to_sdev(sc);

	struct sudmac_pdata *pdata = sdev->pdata;

	const struct sudmac_slave_config *cfg;

	int i;



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

		if (cfg->slave_id == slave_id)

			return cfg;



	return NULL;

}



static int sudmac_set_slave(struct shdma_chan *schan, int slave_id, bool try)

{

	struct sudmac_chan *sc = to_chan(schan);

	const struct sudmac_slave_config *cfg = sudmac_find_slave(sc, slave_id);



	if (!cfg)

		return -ENODEV;



	return 0;

}



static inline void sudmac_dma_halt(struct sudmac_chan *sc)

{

	u32 dintctrl = sudmac_readl(sc, SUDMAC_DINTCTRL);



	sudmac_writel(sc, 0, SUDMAC_CH0DEN + sc->offset);

	sudmac_writel(sc, dintctrl & ~sc->dint_end_bit, SUDMAC_DINTCTRL);

	sudmac_writel(sc, sc->dint_end_bit, SUDMAC_DINTSTSCLR);

}



static int sudmac_desc_setup(struct shdma_chan *schan,

			     struct shdma_desc *sdesc,

			     dma_addr_t src, dma_addr_t dst, size_t *len)

{

	struct sudmac_chan *sc = to_chan(schan);

	struct sudmac_desc *sd = to_desc(sdesc);



	dev_dbg(sc->shdma_chan.dev, "%s: src=%x, dst=%x, len=%d\n",

		__func__, src, dst, *len);



	if (*len > schan->max_xfer_len)

		*len = schan->max_xfer_len;



	if (dst)

		sd->hw.base_addr = dst;

	else if (src)

		sd->hw.base_addr = src;

	sd->hw.base_byte_count = *len;



	return 0;

}



static void sudmac_halt(struct shdma_chan *schan)

{

	struct sudmac_chan *sc = to_chan(schan);



	sudmac_dma_halt(sc);

}



static bool sudmac_chan_irq(struct shdma_chan *schan, int irq)

{

	struct sudmac_chan *sc = to_chan(schan);

	u32 dintsts = sudmac_readl(sc, SUDMAC_DINTSTS);



	if (!(dintsts & sc->dint_end_bit))

		return false;



	/* DMA stop */

	sudmac_dma_halt(sc);



	return true;

}



static size_t sudmac_get_partial(struct shdma_chan *schan,

				 struct shdma_desc *sdesc)

{

	struct sudmac_chan *sc = to_chan(schan);

	struct sudmac_desc *sd = to_desc(sdesc);

	u32 current_byte_count = sudmac_readl(sc, SUDMAC_CH0CBC + sc->offset);



	return sd->hw.base_byte_count - current_byte_count;

}



static bool sudmac_desc_completed(struct shdma_chan *schan,

				  struct shdma_desc *sdesc)

{

	struct sudmac_chan *sc = to_chan(schan);

	struct sudmac_desc *sd = to_desc(sdesc);

	u32 current_addr = sudmac_readl(sc, SUDMAC_CH0CA + sc->offset);



	return sd->hw.base_addr + sd->hw.base_byte_count == current_addr;

}



static int sudmac_chan_probe(struct sudmac_device *su_dev, int id, int irq,

			     unsigned long flags)

{

	struct shdma_dev *sdev = &su_dev->shdma_dev;

	struct platform_device *pdev = to_platform_device(sdev->dma_dev.dev);

	struct sudmac_chan *sc;

	struct shdma_chan *schan;

	int err;



	sc = devm_kzalloc(&pdev->dev, sizeof(struct sudmac_chan), GFP_KERNEL);

	if (!sc) {

		dev_err(sdev->dma_dev.dev,

			"No free memory for allocating dma channels!\n");

		return -ENOMEM;

	}



	schan = &sc->shdma_chan;

	schan->max_xfer_len = 64 * 1024 * 1024 - 1;



	shdma_chan_probe(sdev, schan, id);



	sc->base = su_dev->chan_reg;



	/* get platform_data */

	sc->offset = su_dev->pdata->channel->offset;

	if (su_dev->pdata->channel->config & SUDMAC_TX_BUFFER_MODE)

		sc->cfg |= SUDMAC_SENDBUFM;

	if (su_dev->pdata->channel->config & SUDMAC_RX_END_MODE)

		sc->cfg |= SUDMAC_RCVENDM;

	sc->cfg |= (su_dev->pdata->channel->wait << 4) & SUDMAC_LBA_WAIT;



	if (su_dev->pdata->channel->dint_end_bit & SUDMAC_DMA_BIT_CH0)

		sc->dint_end_bit |= SUDMAC_CH0ENDE;

	if (su_dev->pdata->channel->dint_end_bit & SUDMAC_DMA_BIT_CH1)

		sc->dint_end_bit |= SUDMAC_CH1ENDE;



	/* set up channel irq */

	if (pdev->id >= 0)

		snprintf(sc->dev_id, sizeof(sc->dev_id), "sudmac%d.%d",

			 pdev->id, id);

	else

		snprintf(sc->dev_id, sizeof(sc->dev_id), "sudmac%d", id);



	err = shdma_request_irq(schan, irq, flags, sc->dev_id);

	if (err) {

		dev_err(sdev->dma_dev.dev,

			"DMA channel %d request_irq failed %d\n", id, err);

		goto err_no_irq;

	}



	return 0;



err_no_irq:

	/* remove from dmaengine device node */

	shdma_chan_remove(schan);

	return err;

}



static void sudmac_chan_remove(struct sudmac_device *su_dev)

{

	struct dma_device *dma_dev = &su_dev->shdma_dev.dma_dev;

	struct shdma_chan *schan;

	int i;



	shdma_for_each_chan(schan, &su_dev->shdma_dev, i) {

		struct sudmac_chan *sc = to_chan(schan);



		BUG_ON(!schan);



		shdma_free_irq(&sc->shdma_chan);

		shdma_chan_remove(schan);

	}

	dma_dev->chancnt = 0;

}



static dma_addr_t sudmac_slave_addr(struct shdma_chan *schan)

{

	/* SUDMAC doesn't need the address */

	return 0;

}



static struct shdma_desc *sudmac_embedded_desc(void *buf, int i)

{

	return &((struct sudmac_desc *)buf)[i].shdma_desc;

}



static const struct shdma_ops sudmac_shdma_ops = {

	.desc_completed = sudmac_desc_completed,

	.halt_channel = sudmac_halt,

	.channel_busy = sudmac_channel_busy,

	.slave_addr = sudmac_slave_addr,

	.desc_setup = sudmac_desc_setup,

	.set_slave = sudmac_set_slave,

	.setup_xfer = sudmac_setup_xfer,

	.start_xfer = sudmac_start_xfer,

	.embedded_desc = sudmac_embedded_desc,

	.chan_irq = sudmac_chan_irq,

	.get_partial = sudmac_get_partial,

};



static int sudmac_probe(struct platform_device *pdev)

{

	struct sudmac_pdata *pdata = pdev->dev.platform_data;

	int err, i;

	struct sudmac_device *su_dev;

	struct dma_device *dma_dev;

	struct resource *chan, *irq_res;



	/* get platform data */

	if (!pdata)

		return -ENODEV;



	chan = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);

	if (!chan || !irq_res)

		return -ENODEV;



	err = -ENOMEM;

	su_dev = devm_kzalloc(&pdev->dev, sizeof(struct sudmac_device),

			      GFP_KERNEL);

	if (!su_dev) {

		dev_err(&pdev->dev, "Not enough memory\n");

		return err;

	}



	dma_dev = &su_dev->shdma_dev.dma_dev;



	su_dev->chan_reg = devm_request_and_ioremap(&pdev->dev, chan);

	if (!su_dev->chan_reg)

		return err;



	dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);



	su_dev->shdma_dev.ops = &sudmac_shdma_ops;

	su_dev->shdma_dev.desc_size = sizeof(struct sudmac_desc);

	err = shdma_init(&pdev->dev, &su_dev->shdma_dev, pdata->channel_num);

	if (err < 0)

		return err;



	/* platform data */

	su_dev->pdata = pdev->dev.platform_data;



	platform_set_drvdata(pdev, su_dev);



	/* Create DMA Channel */

	for (i = 0; i < pdata->channel_num; i++) {

		err = sudmac_chan_probe(su_dev, i, irq_res->start, IRQF_SHARED);

		if (err)

			goto chan_probe_err;

	}



	err = dma_async_device_register(&su_dev->shdma_dev.dma_dev);

	if (err < 0)

		goto chan_probe_err;



	return err;



chan_probe_err:

	sudmac_chan_remove(su_dev);



	platform_set_drvdata(pdev, NULL);

	shdma_cleanup(&su_dev->shdma_dev);



	return err;

}



static int sudmac_remove(struct platform_device *pdev)

{

	struct sudmac_device *su_dev = platform_get_drvdata(pdev);

	struct dma_device *dma_dev = &su_dev->shdma_dev.dma_dev;



	dma_async_device_unregister(dma_dev);

	sudmac_chan_remove(su_dev);

	shdma_cleanup(&su_dev->shdma_dev);

	platform_set_drvdata(pdev, NULL);



	return 0;

}



static struct platform_driver sudmac_driver = {

	.driver		= {

		.owner	= THIS_MODULE,

		.name	= SUDMAC_DRV_NAME,

	},

	.probe		= sudmac_probe,

	.remove		= sudmac_remove,

};

module_platform_driver(sudmac_driver);



MODULE_AUTHOR("Yoshihiro Shimoda");

MODULE_DESCRIPTION("Renesas SUDMAC driver");

MODULE_LICENSE("GPL v2");

MODULE_ALIAS("platform:" SUDMAC_DRV_NAME);

include/linux/sudmac.h

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Original line number Diff line number Diff line 
/*

 * Header for the SUDMAC driver

 *

 * Copyright (C) 2013 Renesas Solutions Corp.

 *

 * This is free software; you can redistribute it and/or modify

 * it under the terms of version 2 of the GNU General Public License as

 * published by the Free Software Foundation.

 */

#ifndef SUDMAC_H

#define SUDMAC_H



#include <linux/dmaengine.h>

#include <linux/shdma-base.h>

#include <linux/types.h>



/* Used by slave DMA clients to request DMA to/from a specific peripheral */

struct sudmac_slave {

	struct shdma_slave	shdma_slave;	/* Set by the platform */

};



/*

 * Supplied by platforms to specify, how a DMA channel has to be configured for

 * a certain peripheral

 */

struct sudmac_slave_config {

	int		slave_id;

};



struct sudmac_channel {

	unsigned long	offset;

	unsigned long	config;

	unsigned long	wait;		/* The configuable range is 0 to 3 */

	unsigned long	dint_end_bit;

};



struct sudmac_pdata {

	const struct sudmac_slave_config *slave;

	int slave_num;

	const struct sudmac_channel *channel;

	int channel_num;

};



/* Definitions for the sudmac_channel.config */

#define SUDMAC_TX_BUFFER_MODE	BIT(0)

#define SUDMAC_RX_END_MODE	BIT(1)



/* Definitions for the sudmac_channel.dint_end_bit */

#define SUDMAC_DMA_BIT_CH0	BIT(0)

#define SUDMAC_DMA_BIT_CH1	BIT(1)



#endif

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