Commit 7de87320 authored by Fabrizio Castro's avatar Fabrizio Castro Committed by Vinod Koul
Browse files

dmaengine: sh: rz-dmac: Add RZ/V2H(P) support 



The DMAC IP found on the Renesas RZ/V2H(P) family of SoCs is
similar to the version found on the Renesas RZ/G2L family of
SoCs, but there are some differences:
* It only uses one register area
* It only uses one clock
* It only uses one reset
* Instead of using MID/IRD it uses REQ No
* It is connected to the Interrupt Control Unit (ICU)
* On the RZ/G2L there is only 1 DMAC, on the RZ/V2H(P) there are 5

Add specific support for the Renesas RZ/V2H(P) family of SoC by
tackling the aforementioned differences.

Signed-off-by: default avatarFabrizio Castro <fabrizio.castro.jz@renesas.com>
Reviewed-by: default avatarLad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20250423143422.3747702-6-fabrizio.castro.jz@renesas.com


Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent 056a8aac

drivers/dma/sh/rz-dmac.c

+74 −7
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ 
#include <linux/dmaengine.h>

#include <linux/interrupt.h>

#include <linux/iopoll.h>

#include <linux/irqchip/irq-renesas-rzv2h.h>

#include <linux/list.h>

#include <linux/module.h>

#include <linux/of.h>
@@ -89,8 +90,14 @@ struct rz_dmac_chan { 


#define to_rz_dmac_chan(c)	container_of(c, struct rz_dmac_chan, vc.chan)



struct rz_dmac_icu {

	struct platform_device *pdev;

	u8 dmac_index;

};



struct rz_dmac {

	struct dma_device engine;

	struct rz_dmac_icu icu;

	struct device *dev;

	struct reset_control *rstc;

	void __iomem *base;
@@ -99,6 +106,8 @@ struct rz_dmac { 
	unsigned int n_channels;

	struct rz_dmac_chan *channels;



	bool has_icu;



	DECLARE_BITMAP(modules, 1024);

};
@@ -167,6 +176,9 @@ struct rz_dmac { 
#define RZ_DMAC_MAX_CHANNELS		16

#define DMAC_NR_LMDESC			64



/* RZ/V2H ICU related */

#define RZV2H_MAX_DMAC_INDEX		4



/*

 * -----------------------------------------------------------------------------

 * Device access
@@ -324,7 +336,13 @@ static void rz_dmac_prepare_desc_for_memcpy(struct rz_dmac_chan *channel) 
	lmdesc->chext = 0;

	lmdesc->header = HEADER_LV;



	if (dmac->has_icu) {

		rzv2h_icu_register_dma_req(dmac->icu.pdev, dmac->icu.dmac_index,

					   channel->index,

					   RZV2H_ICU_DMAC_REQ_NO_DEFAULT);

	} else {

		rz_dmac_set_dmars_register(dmac, channel->index, 0);

	}



	channel->chcfg = chcfg;

	channel->chctrl = CHCTRL_STG | CHCTRL_SETEN;
@@ -375,7 +393,13 @@ static void rz_dmac_prepare_descs_for_slave_sg(struct rz_dmac_chan *channel) 


	channel->lmdesc.tail = lmdesc;



	if (dmac->has_icu) {

		rzv2h_icu_register_dma_req(dmac->icu.pdev, dmac->icu.dmac_index,

					   channel->index, channel->mid_rid);

	} else {

		rz_dmac_set_dmars_register(dmac, channel->index, channel->mid_rid);

	}



	channel->chctrl = CHCTRL_SETEN;

}
@@ -647,8 +671,14 @@ static void rz_dmac_device_synchronize(struct dma_chan *chan) 
	if (ret < 0)

		dev_warn(dmac->dev, "DMA Timeout");



	if (dmac->has_icu) {

		rzv2h_icu_register_dma_req(dmac->icu.pdev, dmac->icu.dmac_index,

					   channel->index,

					   RZV2H_ICU_DMAC_REQ_NO_DEFAULT);

	} else {

		rz_dmac_set_dmars_register(dmac, channel->index, 0);

	}

}



/*

 * -----------------------------------------------------------------------------
@@ -824,6 +854,38 @@ static int rz_dmac_chan_probe(struct rz_dmac *dmac, 
	return 0;

}



static int rz_dmac_parse_of_icu(struct device *dev, struct rz_dmac *dmac)

{

	struct device_node *np = dev->of_node;

	struct of_phandle_args args;

	uint32_t dmac_index;

	int ret;



	ret = of_parse_phandle_with_fixed_args(np, "renesas,icu", 1, 0, &args);

	if (ret == -ENOENT)

		return 0;

	if (ret)

		return ret;



	dmac->has_icu = true;



	dmac->icu.pdev = of_find_device_by_node(args.np);

	of_node_put(args.np);

	if (!dmac->icu.pdev) {

		dev_err(dev, "ICU device not found.\n");

		return -ENODEV;

	}



	dmac_index = args.args[0];

	if (dmac_index > RZV2H_MAX_DMAC_INDEX) {

		dev_err(dev, "DMAC index %u invalid.\n", dmac_index);

		return -EINVAL;

	}

	dmac->icu.dmac_index = dmac_index;



	return 0;

}



static int rz_dmac_parse_of(struct device *dev, struct rz_dmac *dmac)

{

	struct device_node *np = dev->of_node;
@@ -840,7 +902,7 @@ static int rz_dmac_parse_of(struct device *dev, struct rz_dmac *dmac) 
		return -EINVAL;

	}



	return 0;

	return rz_dmac_parse_of_icu(dev, dmac);

}



static int rz_dmac_probe(struct platform_device *pdev)
@@ -874,9 +936,11 @@ static int rz_dmac_probe(struct platform_device *pdev) 
	if (IS_ERR(dmac->base))

		return PTR_ERR(dmac->base);



	if (!dmac->has_icu) {

		dmac->ext_base = devm_platform_ioremap_resource(pdev, 1);

		if (IS_ERR(dmac->ext_base))

			return PTR_ERR(dmac->ext_base);

	}



	/* Register interrupt handler for error */

	irq = platform_get_irq_byname(pdev, irqname);
@@ -991,9 +1055,12 @@ static void rz_dmac_remove(struct platform_device *pdev) 
	reset_control_assert(dmac->rstc);

	pm_runtime_put(&pdev->dev);

	pm_runtime_disable(&pdev->dev);



	platform_device_put(dmac->icu.pdev);

}



static const struct of_device_id of_rz_dmac_match[] = {

	{ .compatible = "renesas,r9a09g057-dmac", },

	{ .compatible = "renesas,rz-dmac", },

	{ /* Sentinel */ }

};