Commit 26bd43a7 authored by james qian wang (Arm Technology China)'s avatar james qian wang (Arm Technology China) Committed by Liviu Dudau
Browse files

drm/komeda: Build komeda to be a platform module 



Implement a simple wrapper for platform module to build komeda to module,
Also add a very simple D71 layer code to show how to discover a product.
Komeda driver direct bind the product ENTRY function xxx_identity to DT
compatible name like:

d71_product = {
	.product_id = MALIDP_D71_PRODUCT_ID,
	.identify = d71_identify,
},

const struct of_device_id komeda_of_match[] = {
	{ .compatible = "arm,mali-d71", .data = &d71_product, },
	{},
};

Then when linux found a matched DT node and call driver to probe, we can
easily get the of data, and call into the product to do the identify:

komeda_bind()
{
    ...
    product = of_device_get_match_data(dev);

    product->identify();
    ...
}

Changes in v4:
- Replaced kzalloc with devm_kzalloc

Changes in v3:
- Fixed style problem found by checkpatch.pl --strict.

Signed-off-by: default avatarJames Qian Wang (Arm Technology China) <james.qian.wang@arm.com>
Acked-by: default avatarLiviu Dudau <liviu.dudau@arm.com>
Signed-off-by: default avatarLiviu Dudau <liviu.dudau@arm.com>
parent df766e4a

drivers/gpu/drm/arm/display/include/malidp_io.h

0 → 100644
+42 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

/*

 * (C) COPYRIGHT 2018 ARM Limited. All rights reserved.

 * Author: James.Qian.Wang <james.qian.wang@arm.com>

 *

 */

#ifndef _MALIDP_IO_H_

#define _MALIDP_IO_H_



#include <linux/io.h>



static inline u32

malidp_read32(u32 __iomem *base, u32 offset)

{

	return readl((base + (offset >> 2)));

}



static inline void

malidp_write32(u32 __iomem *base, u32 offset, u32 v)

{

	writel(v, (base + (offset >> 2)));

}



static inline void

malidp_write32_mask(u32 __iomem *base, u32 offset, u32 m, u32 v)

{

	u32 tmp = malidp_read32(base, offset);



	tmp &= (~m);

	malidp_write32(base, offset, v | tmp);

}



static inline void

malidp_write_group(u32 __iomem *base, u32 offset, int num, const u32 *values)

{

	int i;



	for (i = 0; i < num; i++)

		malidp_write32(base, offset + i * 4, values[i]);

}



#endif /*_MALIDP_IO_H_*/

drivers/gpu/drm/arm/display/komeda/Makefile

+5 −1
Original line number Diff line number Diff line
@@ -5,7 +5,11 @@ ccflags-y := \ 
	-I$(src)



komeda-y := \

	komeda_drv.o \

	komeda_dev.o \

	komeda_pipeline.o \

	komeda_pipeline.o



komeda-y += \

	d71/d71_dev.o



obj-$(CONFIG_DRM_KOMEDA) += komeda.o

drivers/gpu/drm/arm/display/komeda/d71/d71_dev.c

0 → 100644
+33 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/*

 * (C) COPYRIGHT 2018 ARM Limited. All rights reserved.

 * Author: James.Qian.Wang <james.qian.wang@arm.com>

 *

 */

#include "malidp_io.h"

#include "komeda_dev.h"



static int d71_enum_resources(struct komeda_dev *mdev)

{

	/* TODO add enum resources */

	return -1;

}



static struct komeda_dev_funcs d71_chip_funcs = {

	.enum_resources	= d71_enum_resources,

	.cleanup	= NULL,

};



#define GLB_ARCH_ID		0x000

#define GLB_CORE_ID		0x004

#define GLB_CORE_INFO		0x008



struct komeda_dev_funcs *

d71_identify(u32 __iomem *reg_base, struct komeda_chip_info *chip)

{

	chip->arch_id	= malidp_read32(reg_base, GLB_ARCH_ID);

	chip->core_id	= malidp_read32(reg_base, GLB_CORE_ID);

	chip->core_info	= malidp_read32(reg_base, GLB_CORE_INFO);



	return &d71_chip_funcs;

}

drivers/gpu/drm/arm/display/komeda/komeda_dev.h

+3 −0
Original line number Diff line number Diff line
@@ -92,6 +92,9 @@ komeda_product_match(struct komeda_dev *mdev, u32 target) 
	return MALIDP_CORE_ID_PRODUCT_ID(mdev->chip.core_id) == target;

}



struct komeda_dev_funcs *

d71_identify(u32 __iomem *reg, struct komeda_chip_info *chip);



struct komeda_dev *komeda_dev_create(struct device *dev);

void komeda_dev_destroy(struct komeda_dev *mdev);

drivers/gpu/drm/arm/display/komeda/komeda_drv.c

0 → 100644
+132 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/*

 * (C) COPYRIGHT 2018 ARM Limited. All rights reserved.

 * Author: James.Qian.Wang <james.qian.wang@arm.com>

 *

 */

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/platform_device.h>

#include <linux/component.h>

#include <drm/drm_of.h>

#include "komeda_dev.h"



struct komeda_drv {

	struct komeda_dev *mdev;

};



static void komeda_unbind(struct device *dev)

{

	struct komeda_drv *mdrv = dev_get_drvdata(dev);



	if (!mdrv)

		return;



	komeda_dev_destroy(mdrv->mdev);



	dev_set_drvdata(dev, NULL);

	devm_kfree(dev, mdrv);

}



static int komeda_bind(struct device *dev)

{

	struct komeda_drv *mdrv;

	int err;



	mdrv = devm_kzalloc(dev, sizeof(*mdrv), GFP_KERNEL);

	if (!mdrv)

		return -ENOMEM;



	mdrv->mdev = komeda_dev_create(dev);

	if (IS_ERR(mdrv->mdev)) {

		err = PTR_ERR(mdrv->mdev);

		goto free_mdrv;

	}



	dev_set_drvdata(dev, mdrv);



	return 0;



free_mdrv:

	devm_kfree(dev, mdrv);

	return err;

}



static const struct component_master_ops komeda_master_ops = {

	.bind	= komeda_bind,

	.unbind	= komeda_unbind,

};



static int compare_of(struct device *dev, void *data)

{

	return dev->of_node == data;

}



static void komeda_add_slave(struct device *master,

			     struct component_match **match,

			     struct device_node *np, int port)

{

	struct device_node *remote;



	remote = of_graph_get_remote_node(np, port, 0);

	if (remote) {

		drm_of_component_match_add(master, match, compare_of, remote);

		of_node_put(remote);

	}

}



static int komeda_platform_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct component_match *match = NULL;

	struct device_node *child;



	if (!dev->of_node)

		return -ENODEV;



	for_each_available_child_of_node(dev->of_node, child) {

		if (of_node_cmp(child->name, "pipeline") != 0)

			continue;



		/* add connector */

		komeda_add_slave(dev, &match, child, KOMEDA_OF_PORT_OUTPUT);

	}



	return component_master_add_with_match(dev, &komeda_master_ops, match);

}



static int komeda_platform_remove(struct platform_device *pdev)

{

	component_master_del(&pdev->dev, &komeda_master_ops);

	return 0;

}



static const struct komeda_product_data komeda_products[] = {

	[MALI_D71] = {

		.product_id = MALIDP_D71_PRODUCT_ID,

		.identify = d71_identify,

	},

};



const struct of_device_id komeda_of_match[] = {

	{ .compatible = "arm,mali-d71", .data = &komeda_products[MALI_D71], },

	{},

};



MODULE_DEVICE_TABLE(of, komeda_of_match);



static struct platform_driver komeda_platform_driver = {

	.probe	= komeda_platform_probe,

	.remove	= komeda_platform_remove,

	.driver	= {

		.name = "komeda",

		.of_match_table	= komeda_of_match,

		.pm = NULL,

	},

};



module_platform_driver(komeda_platform_driver);



MODULE_AUTHOR("James.Qian.Wang <james.qian.wang@arm.com>");

MODULE_DESCRIPTION("Komeda KMS driver");

MODULE_LICENSE("GPL v2");

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