path: root/drivers/gpu/drm/msm/msm_drv.c

/*
 * Copyright (C) 2013 Red Hat
 * Author: Rob Clark <robdclark@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "msm_drv.h"
#include "msm_gpu.h"
#include "msm_kms.h"

static void msm_fb_output_poll_changed(struct drm_device *dev)
{
	struct msm_drm_private *priv = dev->dev_private;
	if (priv->fbdev)
		drm_fb_helper_hotplug_event(priv->fbdev);
}

static const struct drm_mode_config_funcs mode_config_funcs = {
	.fb_create = msm_framebuffer_create,
	.output_poll_changed = msm_fb_output_poll_changed,
};

int msm_register_mmu(struct drm_device *dev, struct msm_mmu *mmu)
{
	struct msm_drm_private *priv = dev->dev_private;
	int idx = priv->num_mmus++;

	if (WARN_ON(idx >= ARRAY_SIZE(priv->mmus)))
		return -EINVAL;

	priv->mmus[idx] = mmu;

	return idx;
}

#ifdef CONFIG_DRM_MSM_REGISTER_LOGGING
static bool reglog = false;
MODULE_PARM_DESC(reglog, "Enable register read/write logging");
module_param(reglog, bool, 0600);
#else
#define reglog 0
#endif

static char *vram;
MODULE_PARM_DESC(vram, "Configure VRAM size (for devices without IOMMU/GPUMMU");
module_param(vram, charp, 0);

/*
 * Util/helpers:
 */

void __iomem *msm_ioremap(struct platform_device *pdev, const char *name,
		const char *dbgname)
{
	struct resource *res;
	unsigned long size;
	void __iomem *ptr;

	if (name)
		res = platform_get_resource_byname(pdev, IORESOURCE_MEM, name);
	else
		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	if (!res) {
		dev_err(&pdev->dev, "failed to get memory resource: %s\n", name);
		return ERR_PTR(-EINVAL);
	}

	size = resource_size(res);

	ptr = devm_ioremap_nocache(&pdev->dev, res->start, size);
	if (!ptr) {
		dev_err(&pdev->dev, "failed to ioremap: %s\n", name);
		return ERR_PTR(-ENOMEM);
	}

	if (reglog)
		printk(KERN_DEBUG "IO:region %s %08x %08lx\n", dbgname, (u32)ptr, size);

	return ptr;
}

void msm_writel(u32 data, void __iomem *addr)
{
	if (reglog)
		printk(KERN_DEBUG "IO:W %08x %08x\n", (u32)addr, data);
	writel(data, addr);
}

u32 msm_readl(const void __iomem *addr)
{
	u32 val = readl(addr);
	if (reglog)
		printk(KERN_ERR "IO:R %08x %08x\n", (u32)addr, val);
	return val;
}

/*
 * DRM operations:
 */

static int msm_unload(struct drm_device *dev)
{
	struct msm_drm_private *priv = dev->dev_private;
	struct msm_kms *kms = priv->kms;
	struct msm_gpu *gpu = priv->gpu;

	drm_kms_helper_poll_fini(dev);
	drm_mode_config_cleanup(dev);
	drm_vblank_cleanup(dev);

	pm_runtime_get_sync(dev->dev);
	drm_irq_uninstall(dev);
	pm_runtime_put_sync(dev->dev);

	flush_workqueue(priv->wq);
	destroy_workqueue(priv->wq);

	if (kms) {
		pm_runtime_disable(dev->dev);
		kms->funcs->destroy(kms);
	}

	if (gpu) {
		mutex_lock(&dev->struct_mutex);
		gpu->funcs->pm_suspend(gpu);
		gpu->funcs->destroy(gpu);
		mutex_unlock(&dev->struct_mutex);
	}

	if (priv->vram.paddr) {
		DEFINE_DMA_ATTRS(attrs);
		dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &attrs);
		drm_mm_takedown(&priv->vram.mm);
		dma_free_attrs(dev->dev,