Release 4.11 drivers/gpu/drm/arm/hdlcd_drv.c

Directory: drivers/gpu/drm/arm
/*
 * Copyright (C) 2013-2015 ARM Limited
 * Author: Liviu Dudau <Liviu.Dudau@arm.com>
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 *
 *  ARM HDLCD Driver
 */

#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/clk.h>
#include <linux/component.h>
#include <linux/list.h>
#include <linux/of_graph.h>
#include <linux/of_reserved_mem.h>
#include <linux/pm_runtime.h>

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

#include "hdlcd_drv.h"
#include "hdlcd_regs.h"



static int hdlcd_load(struct drm_device *drm, unsigned long flags)
{
	struct hdlcd_drm_private *hdlcd = drm->dev_private;
	struct platform_device *pdev = to_platform_device(drm->dev);
	struct resource *res;
	u32 version;
	int ret;

	hdlcd->clk = devm_clk_get(drm->dev, "pxlclk");
	if (IS_ERR(hdlcd->clk))
		return PTR_ERR(hdlcd->clk);

#ifdef CONFIG_DEBUG_FS
	atomic_set(&hdlcd->buffer_underrun_count, 0);
	atomic_set(&hdlcd->bus_error_count, 0);
	atomic_set(&hdlcd->vsync_count, 0);
	atomic_set(&hdlcd->dma_end_count, 0);
#endif

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	hdlcd->mmio = devm_ioremap_resource(drm->dev, res);
	if (IS_ERR(hdlcd->mmio)) {
		DRM_ERROR("failed to map control registers area\n");
		ret = PTR_ERR(hdlcd->mmio);
		hdlcd->mmio = NULL;
		return ret;
	}

	version = hdlcd_read(hdlcd, HDLCD_REG_VERSION);
	if ((version & HDLCD_PRODUCT_MASK) != HDLCD_PRODUCT_ID) {
		DRM_ERROR("unknown product id: 0x%x\n", version);
		return -EINVAL;
	}
	DRM_INFO("found ARM HDLCD version r%dp%d\n",
		(version & HDLCD_VERSION_MAJOR_MASK) >> 8,
		version & HDLCD_VERSION_MINOR_MASK);

	/* Get the optional framebuffer memory resource */
	ret = of_reserved_mem_device_init(drm->dev);
	if (ret && ret != -ENODEV)
		return ret;

	ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32));
	if (ret)
		goto setup_fail;

	ret = hdlcd_setup_crtc(drm);
	if (ret < 0) {
		DRM_ERROR("failed to create crtc\n");
		goto setup_fail;
	}

	ret = drm_irq_install(drm, platform_get_irq(pdev, 0));
	if (ret < 0) {
		DRM_ERROR("failed to install IRQ handler\n");
		goto irq_fail;
	}

	return 0;

irq_fail:
	drm_crtc_cleanup(&hdlcd->crtc);
setup_fail:
	of_reserved_mem_device_release(drm->dev);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Liviu Dudau 330 94.29% 1 33.33%
Dan Carpenter 10 2.86% 1 33.33%
Alexey Brodkin 10 2.86% 1 33.33%
Total 350 100.00% 3 100.00%



static void hdlcd_fb_output_poll_changed(struct drm_device *drm)
{
	struct hdlcd_drm_private *hdlcd = drm->dev_private;

	drm_fbdev_cma_hotplug_event(hdlcd->fbdev);
}

Contributors
Person Tokens Prop Commits CommitProp
Liviu Dudau 27 100.00% 1 100.00%
Total 27 100.00% 1 100.00%


static const struct drm_mode_config_funcs hdlcd_mode_config_funcs = {
	.fb_create = drm_fb_cma_create,
	.output_poll_changed = hdlcd_fb_output_poll_changed,
	.atomic_check = drm_atomic_helper_check,
	.atomic_commit = drm_atomic_helper_commit,
};



static void hdlcd_setup_mode_config(struct drm_device *drm)
{
	drm_mode_config_init(drm);
	drm->mode_config.min_width = 0;
	drm->mode_config.min_height = 0;
	drm->mode_config.max_width = HDLCD_MAX_XRES;
	drm->mode_config.max_height = HDLCD_MAX_YRES;
	drm->mode_config.funcs = &hdlcd_mode_config_funcs;
}

Contributors
Person Tokens Prop Commits CommitProp
Liviu Dudau 57 100.00% 1 100.00%
Total 57 100.00% 1 100.00%



static void hdlcd_lastclose(struct drm_device *drm)
{
	struct hdlcd_drm_private *hdlcd = drm->dev_private;

	drm_fbdev_cma_restore_mode(hdlcd->fbdev);
}

Contributors
Person Tokens Prop Commits CommitProp
Liviu Dudau 27 100.00% 1 100.00%
Total 27 100.00% 1 100.00%



static irqreturn_t hdlcd_irq(int irq, void *arg)
{
	struct drm_device *drm = arg;
	struct hdlcd_drm_private *hdlcd = drm->dev_private;
	unsigned long irq_status;

	irq_status = hdlcd_read(hdlcd, HDLCD_REG_INT_STATUS);

#ifdef CONFIG_DEBUG_FS
	if (irq_status & HDLCD_INTERRUPT_UNDERRUN)
		atomic_inc(&hdlcd->buffer_underrun_count);

	if (irq_status & HDLCD_INTERRUPT_DMA_END)
		atomic_inc(&hdlcd->dma_end_count);

	if (irq_status & HDLCD_INTERRUPT_BUS_ERROR)
		atomic_inc(&hdlcd->bus_error_count);

	if (irq_status & HDLCD_INTERRUPT_VSYNC)
		atomic_inc(&hdlcd->vsync_count);

#endif
	if (irq_status & HDLCD_INTERRUPT_VSYNC)
		drm_crtc_handle_vblank(&hdlcd->crtc);

	/* acknowledge interrupt(s) */
	hdlcd_write(hdlcd, HDLCD_REG_INT_CLEAR, irq_status);

	return IRQ_HANDLED;
}

Contributors
Person Tokens Prop Commits CommitProp
Liviu Dudau 130 100.00% 1 100.00%
Total 130 100.00% 1 100.00%



static void hdlcd_irq_preinstall(struct drm_device *drm)
{
	struct hdlcd_drm_private *hdlcd = drm->dev_private;
	/* Ensure interrupts are disabled */
	hdlcd_write(hdlcd, HDLCD_REG_INT_MASK, 0);
	hdlcd_write(hdlcd, HDLCD_REG_INT_CLEAR, ~0);
}

Contributors
Person Tokens Prop Commits CommitProp
Liviu Dudau 40 100.00% 1 100.00%
Total 40 100.00% 1 100.00%



static int hdlcd_irq_postinstall(struct drm_device *drm)
{
#ifdef CONFIG_DEBUG_FS
	struct hdlcd_drm_private *hdlcd = drm->dev_private;
	unsigned long irq_mask = hdlcd_read(hdlcd, HDLCD_REG_INT_MASK);

	/* enable debug interrupts */
	irq_mask |= HDLCD_DEBUG_INT_MASK;

	hdlcd_write(hdlcd, HDLCD_REG_INT_MASK, irq_mask);
#endif
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Liviu Dudau 53 100.00% 1 100.00%
Total 53 100.00% 1 100.00%



static void hdlcd_irq_uninstall(struct drm_device *drm)
{
	struct hdlcd_drm_private *hdlcd = drm->dev_private;
	/* disable all the interrupts that we might have enabled */
	unsigned long irq_mask = hdlcd_read(hdlcd, HDLCD_REG_INT_MASK);

#ifdef CONFIG_DEBUG_FS
	/* disable debug interrupts */
	irq_mask &= ~HDLCD_DEBUG_INT_MASK;
#endif

	/* disable vsync interrupts */
	irq_mask &= ~HDLCD_INTERRUPT_VSYNC;

	hdlcd_write(hdlcd, HDLCD_REG_INT_MASK, irq_mask);
}

Contributors
Person Tokens Prop Commits CommitProp
Liviu Dudau 58 100.00% 1 100.00%
Total 58 100.00% 1 100.00%



static int hdlcd_enable_vblank(struct drm_device *drm, unsigned int crtc)
{
	struct hdlcd_drm_private *hdlcd = drm->dev_private;
	unsigned int mask = hdlcd_read(hdlcd, HDLCD_REG_INT_MASK);

	hdlcd_write(hdlcd, HDLCD_REG_INT_MASK, mask | HDLCD_INTERRUPT_VSYNC);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Liviu Dudau 49 100.00% 1 100.00%
Total 49 100.00% 1 100.00%



static void hdlcd_disable_vblank(struct drm_device *drm, unsigned int crtc)
{
	struct hdlcd_drm_private *hdlcd = drm->dev_private;
	unsigned int mask = hdlcd_read(hdlcd, HDLCD_REG_INT_MASK);

	hdlcd_write(hdlcd, HDLCD_REG_INT_MASK, mask & ~HDLCD_INTERRUPT_VSYNC);
}

Contributors
Person Tokens Prop Commits CommitProp
Liviu Dudau 47 100.00% 1 100.00%
Total 47 100.00% 1 100.00%

#ifdef CONFIG_DEBUG_FS


static int hdlcd_show_underrun_count(struct seq_file *m, void *arg)
{
	struct drm_info_node *node = (struct drm_info_node *)m->private;
	struct drm_device *drm = node->minor->dev;
	struct hdlcd_drm_private *hdlcd = drm->dev_private;

	seq_printf(m, "underrun : %d\n", atomic_read(&hdlcd->buffer_underrun_count));
	seq_printf(m, "dma_end  : %d\n", atomic_read(&hdlcd->dma_end_count));
	seq_printf(m, "bus_error: %d\n", atomic_read(&hdlcd->bus_error_count));
	seq_printf(m, "vsync    : %d\n", atomic_read(&hdlcd->vsync_count));
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Liviu Dudau 112 100.00% 1 100.00%
Total 112 100.00% 1 100.00%



static int hdlcd_show_pxlclock(struct seq_file *m, void *arg)
{
	struct drm_info_node *node = (struct drm_info_node *)m->private;
	struct drm_device *drm = node->minor->dev;
	struct hdlcd_drm_private *hdlcd = drm->dev_private;
	unsigned long clkrate = clk_get_rate(hdlcd->clk);
	unsigned long mode_clock = hdlcd->crtc.mode.crtc_clock * 1000;

	seq_printf(m, "hw  : %lu\n", clkrate);
	seq_printf(m, "mode: %lu\n", mode_clock);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Liviu Dudau 95 100.00% 1 100.00%
Total 95 100.00% 1 100.00%


static struct drm_info_list hdlcd_debugfs_list[] = {
	{ "interrupt_count", hdlcd_show_underrun_count, 0 },
	{ "clocks", hdlcd_show_pxlclock, 0 },
	{ "fb", drm_fb_cma_debugfs_show, 0 },
};



static int hdlcd_debugfs_init(struct drm_minor *minor)
{
	return drm_debugfs_create_files(hdlcd_debugfs_list,
		ARRAY_SIZE(hdlcd_debugfs_list),	minor->debugfs_root, minor);
}
Contributors
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Liviu Dudau 28 100.00% 1 100.00%
Total 28 100.00% 1 100.00%

#endif


static const struct file_operations fops = {
	.owner		= THIS_MODULE,
	.open		= drm_open,
	.release	= drm_release,
	.unlocked_ioctl	= drm_ioctl,
	.compat_ioctl	= drm_compat_ioctl,
	.poll		= drm_poll,
	.read		= drm_read,
	.llseek		= noop_llseek,
	.mmap		= drm_gem_cma_mmap,
};


static struct drm_driver hdlcd_driver = {
	.driver_features = DRIVER_HAVE_IRQ | DRIVER_GEM |
			   DRIVER_MODESET | DRIVER_PRIME |
			   DRIVER_ATOMIC,
	.lastclose = hdlcd_lastclose,
	.irq_handler = hdlcd_irq,
	.irq_preinstall = hdlcd_irq_preinstall,
	.irq_postinstall = hdlcd_irq_postinstall,
	.irq_uninstall = hdlcd_irq_uninstall,
	.get_vblank_counter = drm_vblank_no_hw_counter,
	.enable_vblank = hdlcd_enable_vblank,
	.disable_vblank = hdlcd_disable_vblank,
	.gem_free_object_unlocked = drm_gem_cma_free_object,
	.gem_vm_ops = &drm_gem_cma_vm_ops,
	.dumb_create = drm_gem_cma_dumb_create,
	.dumb_map_offset = drm_gem_cma_dumb_map_offset,
	.dumb_destroy = drm_gem_dumb_destroy,
	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
	.gem_prime_export = drm_gem_prime_export,
	.gem_prime_import = drm_gem_prime_import,
	.gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
	.gem_prime_vmap = drm_gem_cma_prime_vmap,
	.gem_prime_vunmap = drm_gem_cma_prime_vunmap,
	.gem_prime_mmap = drm_gem_cma_prime_mmap,
#ifdef CONFIG_DEBUG_FS
	.debugfs_init = hdlcd_debugfs_init,
#endif
	.fops = &fops,
	.name = "hdlcd",
	.desc = "ARM HDLCD Controller DRM",
	.date = "20151021",
	.major = 1,
	.minor = 0,
};



static int hdlcd_drm_bind(struct device *dev)
{
	struct drm_device *drm;
	struct hdlcd_drm_private *hdlcd;
	int ret;

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

	drm = drm_dev_alloc(&hdlcd_driver, dev);
	if (IS_ERR(drm))
		return PTR_ERR(drm);

	drm->dev_private = hdlcd;
	dev_set_drvdata(dev, drm);

	hdlcd_setup_mode_config(drm);
	ret = hdlcd_load(drm, 0);
	if (ret)
		goto err_free;

	ret = component_bind_all(dev, drm);
	if (ret) {
		DRM_ERROR("Failed to bind all components\n");
		goto err_unload;
	}

	ret = pm_runtime_set_active(dev);
	if (ret)
		goto err_pm_active;

	pm_runtime_enable(dev);

	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
	if (ret < 0) {
		DRM_ERROR("failed to initialise vblank\n");
		goto err_vblank;
	}

	drm_mode_config_reset(drm);
	drm_kms_helper_poll_init(drm);

	hdlcd->fbdev = drm_fbdev_cma_init(drm, 32,
					  drm->mode_config.num_connector);

	if (IS_ERR(hdlcd->fbdev)) {
		ret = PTR_ERR(hdlcd->fbdev);
		hdlcd->fbdev = NULL;
		goto err_fbdev;
	}

	ret = drm_dev_register(drm, 0);
	if (ret)
		goto err_register;

	return 0;

err_register:
	if (hdlcd->fbdev) {
		drm_fbdev_cma_fini(hdlcd->fbdev);
		hdlcd->fbdev = NULL;
	}
err_fbdev:
	drm_kms_helper_poll_fini(drm);
	drm_vblank_cleanup(drm);
err_vblank:
	pm_runtime_disable(drm->dev);
err_pm_active:
	component_unbind_all(dev, drm);
err_unload:
	drm_irq_uninstall(drm);
	of_reserved_mem_device_release(drm->dev);
err_free:
	drm_mode_config_cleanup(drm);
	dev_set_drvdata(dev, NULL);
	drm_dev_unref(drm);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Liviu Dudau 288 84.71% 2 40.00%
Brian Starkey 40 11.76% 1 20.00%
Tom Gundersen 7 2.06% 1 20.00%
Robin Murphy 5 1.47% 1 20.00%
Total 340 100.00% 5 100.00%



static void hdlcd_drm_unbind(struct device *dev)
{
	struct drm_device *drm = dev_get_drvdata(dev);
	struct hdlcd_drm_private *hdlcd = drm->dev_private;

	drm_dev_unregister(drm);
	if (hdlcd->fbdev) {
		drm_fbdev_cma_fini(hdlcd->fbdev);
		hdlcd->fbdev = NULL;
	}
	drm_kms_helper_poll_fini(drm);
	component_unbind_all(dev, drm);
	drm_vblank_cleanup(drm);
	pm_runtime_get_sync(drm->dev);
	drm_irq_uninstall(drm);
	pm_runtime_put_sync(drm->dev);
	pm_runtime_disable(drm->dev);
	of_reserved_mem_device_release(drm->dev);
	drm_mode_config_cleanup(drm);
	drm_dev_unref(drm);
	drm->dev_private = NULL;
	dev_set_drvdata(dev, NULL);
}

Contributors
Person Tokens Prop Commits CommitProp
Liviu Dudau 124 96.12% 1 50.00%
Brian Starkey 5 3.88% 1 50.00%
Total 129 100.00% 2 100.00%


static const struct component_master_ops hdlcd_master_ops = {
	.bind		= hdlcd_drm_bind,
	.unbind		= hdlcd_drm_unbind,
};



static int compare_dev(struct device *dev, void *data)
{
	return dev->of_node == data;
}

Contributors
Person Tokens Prop Commits CommitProp
Liviu Dudau 22 100.00% 1 100.00%
Total 22 100.00% 1 100.00%



static int hdlcd_probe(struct platform_device *pdev)
{
	struct device_node *port, *ep;
	struct component_match *match = NULL;

	if (!pdev->dev.of_node)
		return -ENODEV;

	/* there is only one output port inside each device, find it */
	ep = of_graph_get_next_endpoint(pdev->dev.of_node, NULL);
	if (!ep)
		return -ENODEV;

	if (!of_device_is_available(ep)) {
		of_node_put(ep);
		return -ENODEV;
	}

	/* add the remote encoder port as component */
	port = of_graph_get_remote_port_parent(ep);
	of_node_put(ep);
	if (!port || !of_device_is_available(port)) {
		of_node_put(port);
		return -EAGAIN;
	}

	drm_of_component_match_add(&pdev->dev, &match, compare_dev, port);
	of_node_put(port);

	return component_master_add_with_match(&pdev->dev, &hdlcd_master_ops,
					       match);
}

Contributors
Person Tokens Prop Commits CommitProp
Liviu Dudau 144 96.00% 1 50.00%
Russell King 6 4.00% 1 50.00%
Total 150 100.00% 2 100.00%



static int hdlcd_remove(struct platform_device *pdev)
{
	component_master_del(&pdev->dev, &hdlcd_master_ops);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Liviu Dudau 25 100.00% 1 100.00%
Total 25 100.00% 1 100.00%


static const struct of_device_id  hdlcd_of_match[] = {
	{ .compatible	= "arm,hdlcd" },
	{},
};
MODULE_DEVICE_TABLE(of, hdlcd_of_match);



static int __maybe_unused hdlcd_pm_suspend(struct device *dev)
{
	struct drm_device *drm = dev_get_drvdata(dev);
	struct hdlcd_drm_private *hdlcd = drm ? drm->dev_private : NULL;

	if (!hdlcd)
		return 0;

	drm_kms_helper_poll_disable(drm);

	hdlcd->state = drm_atomic_helper_suspend(drm);
	if (IS_ERR(hdlcd->state)) {
		drm_kms_helper_poll_enable(drm);
		return PTR_ERR(hdlcd->state);
	}

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Liviu Dudau 84 100.00% 2 100.00%
Total 84 100.00% 2 100.00%



static int __maybe_unused hdlcd_pm_resume(struct device *dev)
{
	struct drm_device *drm = dev_get_drvdata(dev);
	struct hdlcd_drm_private *hdlcd = drm ? drm->dev_private : NULL;

	if (!hdlcd)
		return 0;

	drm_atomic_helper_resume(drm, hdlcd->state);
	drm_kms_helper_poll_enable(drm);
	pm_runtime_set_active(dev);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Liviu Dudau 65 100.00% 2 100.00%
Total 65 100.00% 2 100.00%

static SIMPLE_DEV_PM_OPS(hdlcd_pm_ops, hdlcd_pm_suspend, hdlcd_pm_resume);


static struct platform_driver hdlcd_platform_driver = {
	.probe		= hdlcd_probe,
	.remove		= hdlcd_remove,
	.driver	= {
		.name = "hdlcd",
		.pm = &hdlcd_pm_ops,
		.of_match_table	= hdlcd_of_match,
        },
};


module_platform_driver(hdlcd_platform_driver);

MODULE_AUTHOR("Liviu Dudau");
MODULE_DESCRIPTION("ARM HDLCD DRM driver");
MODULE_LICENSE("GPL v2");
Overall Contributors
Person Tokens Prop Commits CommitProp
Liviu Dudau 2259 96.37% 3 27.27%
Brian Starkey 45 1.92% 1 9.09%
Dan Carpenter 10 0.43% 1 9.09%
Alexey Brodkin 10 0.43% 1 9.09%
Tom Gundersen 7 0.30% 1 9.09%
Russell King 6 0.26% 1 9.09%
Robin Murphy 5 0.21% 1 9.09%
Daniel Vetter 2 0.09% 2 18.18%
Total 2344 100.00% 11 100.00%
Directory: drivers/gpu/drm/arm

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.
Person	Tokens	Prop	Commits	CommitProp
Liviu Dudau	330	94.29%	1	33.33%
Dan Carpenter	10	2.86%	1	33.33%
Alexey Brodkin	10	2.86%	1	33.33%
Total	350	100.00%	3	100.00%
cregit-Linux how code gets into the kernel

Release 4.11 drivers/gpu/drm/arm/hdlcd_drv.c

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