drivers/gpu/drm/pl111/pl111_drv.c - linux - Git at Google

 /*
  * (C) COPYRIGHT 2012-2013 ARM Limited. All rights reserved.
  *
  * Parts of this file were based on sources as follows:
  *
  * Copyright (c) 2006-2008 Intel Corporation
  * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
  * Copyright (C) 2011 Texas Instruments
  *
  * This program is free software and is provided to you under the terms of the
  * GNU General Public License version 2 as published by the Free Software
  * Foundation, and any use by you of this program is subject to the terms of
  * such GNU licence.
  *
  */

 /**
  * DOC: ARM PrimeCell PL111 CLCD Driver
  *
  * The PL111 is a simple LCD controller that can support TFT and STN
  * displays.  This driver exposes a standard KMS interface for them.
  *
  * This driver uses the same Device Tree binding as the fbdev CLCD
  * driver.  While the fbdev driver supports panels that may be
  * connected to the CLCD internally to the CLCD driver, in DRM the
  * panels get split out to drivers/gpu/drm/panels/.  This means that,
  * in converting from using fbdev to using DRM, you also need to write
  * a panel driver (which may be as simple as an entry in
  * panel-simple.c).
  *
  * The driver currently doesn't expose the cursor.  The DRM API for
  * cursors requires support for 64x64 ARGB8888 cursor images, while
  * the hardware can only support 64x64 monochrome with masking
  * cursors.  While one could imagine trying to hack something together
  * to look at the ARGB8888 and program reasonable in monochrome, we
  * just don't expose the cursor at all instead, and leave cursor
  * support to the X11 software cursor layer.
  *
  * TODO:
  *
  * - Fix race between setting plane base address and getting IRQ for
  *   vsync firing the pageflip completion.
  *
  * - Expose the correct set of formats we can support based on the
  *   "arm,pl11x,tft-r0g0b0-pads" DT property.
  *
  * - Use the "max-memory-bandwidth" DT property to filter the
  *   supported formats.
  *
  * - Read back hardware state at boot to skip reprogramming the
  *   hardware when doing a no-op modeset.
  *
  * - Use the CLKSEL bit to support switching between the two external
  *   clock parents.
  */

 #include <linux/amba/bus.h>
 #include <linux/amba/clcd-regs.h>
 #include <linux/version.h>
 #include <linux/shmem_fs.h>
 #include <linux/dma-buf.h>
 #include <linux/module.h>
 #include <linux/slab.h>

 #include <drm/drmP.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_gem_cma_helper.h>
 #include <drm/drm_fb_cma_helper.h>

 #include "pl111_drm.h"

 #define DRIVER_DESC      "DRM module for PL111"

 static struct drm_mode_config_funcs mode_config_funcs = {
 	.fb_create = drm_fb_cma_create,
 	.atomic_check = drm_atomic_helper_check,
 	.atomic_commit = drm_atomic_helper_commit,
 };

 static int pl111_modeset_init(struct drm_device *dev)
 {
 	struct drm_mode_config *mode_config;
 	struct pl111_drm_dev_private *priv = dev->dev_private;
 	int ret = 0;

 	drm_mode_config_init(dev);
 	mode_config = &dev->mode_config;
 	mode_config->funcs = &mode_config_funcs;
 	mode_config->min_width = 1;
 	mode_config->max_width = 1024;
 	mode_config->min_height = 1;
 	mode_config->max_height = 768;

 	ret = pl111_connector_init(dev);
 	if (ret) {
 		dev_err(dev->dev, "Failed to create pl111_drm_connector\n");
 		goto out_config;
 	}

 	/* Don't actually attach if we didn't find a drm_panel
 	 * attached to us.  This will allow a kernel to include both
 	 * the fbdev pl111 driver and this one, and choose between
 	 * them based on which subsystem has support for the panel.
 	 */
 	if (!priv->connector.panel) {
 		dev_info(dev->dev,
 			 "Disabling due to lack of DRM panel device.\n");
 		ret = -ENODEV;
 		goto out_config;
 	}

 	ret = pl111_display_init(dev);
 	if (ret != 0) {
 		dev_err(dev->dev, "Failed to init display\n");
 		goto out_config;
 	}

 	ret = drm_vblank_init(dev, 1);
 	if (ret != 0) {
 		dev_err(dev->dev, "Failed to init vblank\n");
 		goto out_config;
 	}

 	drm_mode_config_reset(dev);

 	priv->fbdev = drm_fbdev_cma_init(dev, 32,
 					 dev->mode_config.num_connector);

 	drm_kms_helper_poll_init(dev);

 	goto finish;

 out_config:
 	drm_mode_config_cleanup(dev);
 finish:
 	return ret;
 }

 DEFINE_DRM_GEM_CMA_FOPS(drm_fops);

 static void pl111_lastclose(struct drm_device *dev)
 {
 	struct pl111_drm_dev_private *priv = dev->dev_private;

 	drm_fbdev_cma_restore_mode(priv->fbdev);
 }

 static struct drm_driver pl111_drm_driver = {
 	.driver_features =
 		DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME | DRIVER_ATOMIC,
 	.lastclose = pl111_lastclose,
 	.ioctls = NULL,
 	.fops = &drm_fops,
 	.name = "pl111",
 	.desc = DRIVER_DESC,
 	.date = "20170317",
 	.major = 1,
 	.minor = 0,
 	.patchlevel = 0,
 	.dumb_create = drm_gem_cma_dumb_create,
 	.dumb_destroy = drm_gem_dumb_destroy,
 	.dumb_map_offset = drm_gem_cma_dumb_map_offset,
 	.gem_free_object = drm_gem_cma_free_object,
 	.gem_vm_ops = &drm_gem_cma_vm_ops,

 	.enable_vblank = pl111_enable_vblank,
 	.disable_vblank = pl111_disable_vblank,

 	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 	.gem_prime_import = drm_gem_prime_import,
 	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 	.gem_prime_export = drm_gem_prime_export,
 	.gem_prime_get_sg_table	= drm_gem_cma_prime_get_sg_table,

 #if defined(CONFIG_DEBUG_FS)
 	.debugfs_init = pl111_debugfs_init,
 #endif
 };

 static int pl111_amba_probe(struct amba_device *amba_dev,
 			    const struct amba_id *id)
 {
 	struct device *dev = &amba_dev->dev;
 	struct pl111_drm_dev_private *priv;
 	struct drm_device *drm;
 	int ret;

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

 	drm = drm_dev_alloc(&pl111_drm_driver, dev);
 	if (IS_ERR(drm))
 		return PTR_ERR(drm);
 	amba_set_drvdata(amba_dev, drm);
 	priv->drm = drm;
 	drm->dev_private = priv;

 	priv->regs = devm_ioremap_resource(dev, &amba_dev->res);
 	if (IS_ERR(priv->regs)) {
 		dev_err(dev, "%s failed mmio\n", __func__);
 		return PTR_ERR(priv->regs);
 	}

 	/* turn off interrupts before requesting the irq */
 	writel(0, priv->regs + CLCD_PL111_IENB);

 	ret = devm_request_irq(dev, amba_dev->irq[0], pl111_irq, 0,
 			       "pl111", priv);
 	if (ret != 0) {
 		dev_err(dev, "%s failed irq %d\n", __func__, ret);
 		return ret;
 	}

 	ret = pl111_modeset_init(drm);
 	if (ret != 0)
 		goto dev_unref;

 	ret = drm_dev_register(drm, 0);
 	if (ret < 0)
 		goto dev_unref;

 	return 0;

 dev_unref:
 	drm_dev_unref(drm);
 	return ret;
 }

 static int pl111_amba_remove(struct amba_device *amba_dev)
 {
 	struct drm_device *drm = amba_get_drvdata(amba_dev);
 	struct pl111_drm_dev_private *priv = drm->dev_private;

 	drm_dev_unregister(drm);
 	if (priv->fbdev)
 		drm_fbdev_cma_fini(priv->fbdev);
 	drm_mode_config_cleanup(drm);
 	drm_dev_unref(drm);

 	return 0;
 }

 static struct amba_id pl111_id_table[] = {
 	{
 		.id = 0x00041111,
 		.mask = 0x000fffff,
 	},
 	{0, 0},
 };

 static struct amba_driver pl111_amba_driver __maybe_unused = {
 	.drv = {
 		.name = "drm-clcd-pl111",
 	},
 	.probe = pl111_amba_probe,
 	.remove = pl111_amba_remove,
 	.id_table = pl111_id_table,
 };

 #ifdef CONFIG_ARM_AMBA
 module_amba_driver(pl111_amba_driver);
 #endif

 MODULE_DESCRIPTION(DRIVER_DESC);
 MODULE_AUTHOR("ARM Ltd.");
 MODULE_LICENSE("GPL");
	/*
	* (C) COPYRIGHT 2012-2013 ARM Limited. All rights reserved.
	*
	* Parts of this file were based on sources as follows:
	*
	* Copyright (c) 2006-2008 Intel Corporation
	* Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
	* Copyright (C) 2011 Texas Instruments
	*
	* This program is free software and is provided to you under the terms of the
	* GNU General Public License version 2 as published by the Free Software
	* Foundation, and any use by you of this program is subject to the terms of
	* such GNU licence.
	*
	*/

	/**
	* DOC: ARM PrimeCell PL111 CLCD Driver
	*
	* The PL111 is a simple LCD controller that can support TFT and STN
	* displays. This driver exposes a standard KMS interface for them.
	*
	* This driver uses the same Device Tree binding as the fbdev CLCD
	* driver. While the fbdev driver supports panels that may be
	* connected to the CLCD internally to the CLCD driver, in DRM the
	* panels get split out to drivers/gpu/drm/panels/. This means that,
	* in converting from using fbdev to using DRM, you also need to write
	* a panel driver (which may be as simple as an entry in
	* panel-simple.c).
	*
	* The driver currently doesn't expose the cursor. The DRM API for
	* cursors requires support for 64x64 ARGB8888 cursor images, while
	* the hardware can only support 64x64 monochrome with masking
	* cursors. While one could imagine trying to hack something together
	* to look at the ARGB8888 and program reasonable in monochrome, we
	* just don't expose the cursor at all instead, and leave cursor
	* support to the X11 software cursor layer.
	*
	* TODO:
	*
	* - Fix race between setting plane base address and getting IRQ for
	* vsync firing the pageflip completion.
	*
	* - Expose the correct set of formats we can support based on the
	* "arm,pl11x,tft-r0g0b0-pads" DT property.
	*
	* - Use the "max-memory-bandwidth" DT property to filter the
	* supported formats.
	*
	* - Read back hardware state at boot to skip reprogramming the
	* hardware when doing a no-op modeset.
	*
	* - Use the CLKSEL bit to support switching between the two external
	* clock parents.
	*/

	#include <linux/amba/bus.h>
	#include <linux/amba/clcd-regs.h>
	#include <linux/version.h>
	#include <linux/shmem_fs.h>
	#include <linux/dma-buf.h>
	#include <linux/module.h>
	#include <linux/slab.h>

	#include <drm/drmP.h>
	#include <drm/drm_atomic_helper.h>
	#include <drm/drm_crtc_helper.h>
	#include <drm/drm_gem_cma_helper.h>
	#include <drm/drm_fb_cma_helper.h>

	#include "pl111_drm.h"

	#define DRIVER_DESC "DRM module for PL111"

	static struct drm_mode_config_funcs mode_config_funcs = {
	.fb_create = drm_fb_cma_create,
	.atomic_check = drm_atomic_helper_check,
	.atomic_commit = drm_atomic_helper_commit,
	};

	static int pl111_modeset_init(struct drm_device *dev)
	{
	struct drm_mode_config *mode_config;
	struct pl111_drm_dev_private *priv = dev->dev_private;
	int ret = 0;

	drm_mode_config_init(dev);
	mode_config = &dev->mode_config;
	mode_config->funcs = &mode_config_funcs;
	mode_config->min_width = 1;
	mode_config->max_width = 1024;
	mode_config->min_height = 1;
	mode_config->max_height = 768;

	ret = pl111_connector_init(dev);
	if (ret) {
	dev_err(dev->dev, "Failed to create pl111_drm_connector\n");
	goto out_config;
	}

	/* Don't actually attach if we didn't find a drm_panel
	* attached to us. This will allow a kernel to include both
	* the fbdev pl111 driver and this one, and choose between
	* them based on which subsystem has support for the panel.
	*/
	if (!priv->connector.panel) {
	dev_info(dev->dev,
	"Disabling due to lack of DRM panel device.\n");
	ret = -ENODEV;
	goto out_config;
	}

	ret = pl111_display_init(dev);
	if (ret != 0) {
	dev_err(dev->dev, "Failed to init display\n");
	goto out_config;
	}

	ret = drm_vblank_init(dev, 1);
	if (ret != 0) {
	dev_err(dev->dev, "Failed to init vblank\n");
	goto out_config;
	}

	drm_mode_config_reset(dev);

	priv->fbdev = drm_fbdev_cma_init(dev, 32,
	dev->mode_config.num_connector);

	drm_kms_helper_poll_init(dev);

	goto finish;

	out_config:
	drm_mode_config_cleanup(dev);
	finish:
	return ret;
	}

	DEFINE_DRM_GEM_CMA_FOPS(drm_fops);

	static void pl111_lastclose(struct drm_device *dev)
	{
	struct pl111_drm_dev_private *priv = dev->dev_private;

	drm_fbdev_cma_restore_mode(priv->fbdev);
	}

	static struct drm_driver pl111_drm_driver = {
	.driver_features =
	DRIVER_MODESET \| DRIVER_GEM \| DRIVER_PRIME \| DRIVER_ATOMIC,
	.lastclose = pl111_lastclose,
	.ioctls = NULL,
	.fops = &drm_fops,
	.name = "pl111",
	.desc = DRIVER_DESC,
	.date = "20170317",
	.major = 1,
	.minor = 0,
	.patchlevel = 0,
	.dumb_create = drm_gem_cma_dumb_create,
	.dumb_destroy = drm_gem_dumb_destroy,
	.dumb_map_offset = drm_gem_cma_dumb_map_offset,
	.gem_free_object = drm_gem_cma_free_object,
	.gem_vm_ops = &drm_gem_cma_vm_ops,

	.enable_vblank = pl111_enable_vblank,
	.disable_vblank = pl111_disable_vblank,

	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
	.gem_prime_import = drm_gem_prime_import,
	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
	.gem_prime_export = drm_gem_prime_export,
	.gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,

	#if defined(CONFIG_DEBUG_FS)
	.debugfs_init = pl111_debugfs_init,
	#endif
	};

	static int pl111_amba_probe(struct amba_device *amba_dev,
	const struct amba_id *id)
	{
	struct device *dev = &amba_dev->dev;
	struct pl111_drm_dev_private *priv;
	struct drm_device *drm;
	int ret;

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

	drm = drm_dev_alloc(&pl111_drm_driver, dev);
	if (IS_ERR(drm))
	return PTR_ERR(drm);
	amba_set_drvdata(amba_dev, drm);
	priv->drm = drm;
	drm->dev_private = priv;

	priv->regs = devm_ioremap_resource(dev, &amba_dev->res);
	if (IS_ERR(priv->regs)) {
	dev_err(dev, "%s failed mmio\n", __func__);
	return PTR_ERR(priv->regs);
	}

	/* turn off interrupts before requesting the irq */
	writel(0, priv->regs + CLCD_PL111_IENB);

	ret = devm_request_irq(dev, amba_dev->irq[0], pl111_irq, 0,
	"pl111", priv);
	if (ret != 0) {
	dev_err(dev, "%s failed irq %d\n", __func__, ret);
	return ret;
	}

	ret = pl111_modeset_init(drm);
	if (ret != 0)
	goto dev_unref;

	ret = drm_dev_register(drm, 0);
	if (ret < 0)
	goto dev_unref;

	return 0;

	dev_unref:
	drm_dev_unref(drm);
	return ret;
	}

	static int pl111_amba_remove(struct amba_device *amba_dev)
	{
	struct drm_device *drm = amba_get_drvdata(amba_dev);
	struct pl111_drm_dev_private *priv = drm->dev_private;

	drm_dev_unregister(drm);
	if (priv->fbdev)
	drm_fbdev_cma_fini(priv->fbdev);
	drm_mode_config_cleanup(drm);
	drm_dev_unref(drm);

	return 0;
	}

	static struct amba_id pl111_id_table[] = {
	{
	.id = 0x00041111,
	.mask = 0x000fffff,
	},
	{0, 0},
	};

	static struct amba_driver pl111_amba_driver __maybe_unused = {
	.drv = {
	.name = "drm-clcd-pl111",
	},
	.probe = pl111_amba_probe,
	.remove = pl111_amba_remove,
	.id_table = pl111_id_table,
	};

	#ifdef CONFIG_ARM_AMBA
	module_amba_driver(pl111_amba_driver);
	#endif

	MODULE_DESCRIPTION(DRIVER_DESC);
	MODULE_AUTHOR("ARM Ltd.");
	MODULE_LICENSE("GPL");