--- /dev/null
+/* exynos_drm_fbdev.c
+ *
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd.
+ * Authors:
+ * Inki Dae <inki.dae@samsung.com>
+ * Joonyoung Shim <jy0922.shim@samsung.com>
+ * Seung-Woo Kim <sw0312.kim@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <drm/drmP.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/exynos_drm.h>
+
+#include "exynos_drm_drv.h"
+#include "exynos_drm_fb.h"
+#include "exynos_drm_fbdev.h"
+#include "exynos_drm_gem.h"
+#include "exynos_drm_iommu.h"
+
+#define MAX_CONNECTOR 4
+#define PREFERRED_BPP 32
+
+#define to_exynos_fbdev(x) container_of(x, struct exynos_drm_fbdev,\
+ drm_fb_helper)
+
+struct exynos_drm_fbdev {
+ struct drm_fb_helper drm_fb_helper;
+ struct exynos_drm_gem_obj *exynos_gem_obj;
+};
+
+static int exynos_drm_fb_mmap(struct fb_info *info,
+ struct vm_area_struct *vma)
+{
+ struct drm_fb_helper *helper = info->par;
+ struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
+ struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
+ struct exynos_drm_gem_buf *buffer = exynos_gem_obj->buffer;
+ unsigned long vm_size;
+ int ret;
+
+ vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
+
+ vm_size = vma->vm_end - vma->vm_start;
+
+ if (vm_size > buffer->size)
+ return -EINVAL;
+
+ ret = dma_mmap_attrs(helper->dev->dev, vma, buffer->pages,
+ buffer->dma_addr, buffer->size, &buffer->dma_attrs);
+ if (ret < 0) {
+ DRM_ERROR("failed to mmap.\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static struct fb_ops exynos_drm_fb_ops = {
+ .owner = THIS_MODULE,
+ .fb_mmap = exynos_drm_fb_mmap,
+ .fb_fillrect = cfb_fillrect,
+ .fb_copyarea = cfb_copyarea,
+ .fb_imageblit = cfb_imageblit,
+ .fb_check_var = drm_fb_helper_check_var,
+ .fb_set_par = drm_fb_helper_set_par,
+ .fb_blank = drm_fb_helper_blank,
+ .fb_pan_display = drm_fb_helper_pan_display,
+ .fb_setcmap = drm_fb_helper_setcmap,
+};
+
+static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
+ struct drm_fb_helper_surface_size *sizes,
+ struct drm_framebuffer *fb)
+{
+ struct fb_info *fbi = helper->fbdev;
+ struct exynos_drm_gem_buf *buffer;
+ unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
+ unsigned int nr_pages;
+ unsigned long offset;
+
+ drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
+ drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
+
+ /* RGB formats use only one buffer */
+ buffer = exynos_drm_fb_buffer(fb, 0);
+ if (!buffer) {
+ DRM_DEBUG_KMS("buffer is null.\n");
+ return -EFAULT;
+ }
+
+ nr_pages = buffer->size >> PAGE_SHIFT;
+
+ buffer->kvaddr = (void __iomem *) vmap(buffer->pages,
+ nr_pages, VM_MAP,
+ pgprot_writecombine(PAGE_KERNEL));
+ if (!buffer->kvaddr) {
+ DRM_ERROR("failed to map pages to kernel space.\n");
+ return -EIO;
+ }
+
+ /* buffer count to framebuffer always is 1 at booting time. */
+ exynos_drm_fb_set_buf_cnt(fb, 1);
+
+ offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
+ offset += fbi->var.yoffset * fb->pitches[0];
+
+ fbi->screen_base = buffer->kvaddr + offset;
+ fbi->screen_size = size;
+ fbi->fix.smem_len = size;
+
+ return 0;
+}
+
+static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
+ struct drm_fb_helper_surface_size *sizes)
+{
+ struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
+ struct exynos_drm_gem_obj *exynos_gem_obj;
+ struct drm_device *dev = helper->dev;
+ struct fb_info *fbi;
+ struct drm_mode_fb_cmd2 mode_cmd = { 0 };
+ struct platform_device *pdev = dev->platformdev;
+ unsigned long size;
+ int ret;
+
+ DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
+ sizes->surface_width, sizes->surface_height,
+ sizes->surface_bpp);
+
+ mode_cmd.width = sizes->surface_width;
+ mode_cmd.height = sizes->surface_height;
+ mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
+ mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
+ sizes->surface_depth);
+
+ mutex_lock(&dev->struct_mutex);
+
+ fbi = framebuffer_alloc(0, &pdev->dev);
+ if (!fbi) {
+ DRM_ERROR("failed to allocate fb info.\n");
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ size = mode_cmd.pitches[0] * mode_cmd.height;
+
+ exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
+ /*
+ * If physically contiguous memory allocation fails and if IOMMU is
+ * supported then try to get buffer from non physically contiguous
+ * memory area.
+ */
+ if (IS_ERR(exynos_gem_obj) && is_drm_iommu_supported(dev)) {
+ dev_warn(&pdev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
+ exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
+ size);
+ }
+
+ if (IS_ERR(exynos_gem_obj)) {
+ ret = PTR_ERR(exynos_gem_obj);
+ goto err_release_framebuffer;
+ }
+
+ exynos_fbdev->exynos_gem_obj = exynos_gem_obj;
+
+ helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd,
+ &exynos_gem_obj->base);
+ if (IS_ERR(helper->fb)) {
+ DRM_ERROR("failed to create drm framebuffer.\n");
+ ret = PTR_ERR(helper->fb);
+ goto err_destroy_gem;
+ }
+
+ helper->fbdev = fbi;
+
+ fbi->par = helper;
+ fbi->flags = FBINFO_FLAG_DEFAULT;
+ fbi->fbops = &exynos_drm_fb_ops;
+
+ ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
+ if (ret) {
+ DRM_ERROR("failed to allocate cmap.\n");
+ goto err_destroy_framebuffer;
+ }
+
+ ret = exynos_drm_fbdev_update(helper, sizes, helper->fb);
+ if (ret < 0)
+ goto err_dealloc_cmap;
+
+ mutex_unlock(&dev->struct_mutex);
+ return ret;
+
+err_dealloc_cmap:
+ fb_dealloc_cmap(&fbi->cmap);
+err_destroy_framebuffer:
+ drm_framebuffer_cleanup(helper->fb);
+err_destroy_gem:
+ exynos_drm_gem_destroy(exynos_gem_obj);
+err_release_framebuffer:
+ framebuffer_release(fbi);
+
+/*
+ * if failed, all resources allocated above would be released by
+ * drm_mode_config_cleanup() when drm_load() had been called prior
+ * to any specific driver such as fimd or hdmi driver.
+ */
+out:
+ mutex_unlock(&dev->struct_mutex);
+ return ret;
+}
+
+static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
+ .fb_probe = exynos_drm_fbdev_create,
+};
+
+static bool exynos_drm_fbdev_is_anything_connected(struct drm_device *dev)
+{
+ struct drm_connector *connector;
+ bool ret = false;
+
+ mutex_lock(&dev->mode_config.mutex);
+ list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+ if (connector->status != connector_status_connected)
+ continue;
+
+ ret = true;
+ break;
+ }
+ mutex_unlock(&dev->mode_config.mutex);
+
+ return ret;
+}
+
+int exynos_drm_fbdev_init(struct drm_device *dev)
+{
+ struct exynos_drm_fbdev *fbdev;
+ struct exynos_drm_private *private = dev->dev_private;
+ struct drm_fb_helper *helper;
+ unsigned int num_crtc;
+ int ret;
+
+ if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
+ return 0;
+
+ if (!exynos_drm_fbdev_is_anything_connected(dev))
+ return 0;
+
+ fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
+ if (!fbdev)
+ return -ENOMEM;
+
+ private->fb_helper = helper = &fbdev->drm_fb_helper;
+
+ drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs);
+
+ num_crtc = dev->mode_config.num_crtc;
+
+ ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
+ if (ret < 0) {
+ DRM_ERROR("failed to initialize drm fb helper.\n");
+ goto err_init;
+ }
+
+ ret = drm_fb_helper_single_add_all_connectors(helper);
+ if (ret < 0) {
+ DRM_ERROR("failed to register drm_fb_helper_connector.\n");
+ goto err_setup;
+
+ }
+
+ /* disable all the possible outputs/crtcs before entering KMS mode */
+ drm_helper_disable_unused_functions(dev);
+
+ ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
+ if (ret < 0) {
+ DRM_ERROR("failed to set up hw configuration.\n");
+ goto err_setup;
+ }
+
+ return 0;
+
+err_setup:
+ drm_fb_helper_fini(helper);
+
+err_init:
+ private->fb_helper = NULL;
+ kfree(fbdev);
+
+ return ret;
+}
+
+static void exynos_drm_fbdev_destroy(struct drm_device *dev,
+ struct drm_fb_helper *fb_helper)
+{
+ struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
+ struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
+ struct drm_framebuffer *fb;
+
+ if (exynos_gem_obj->buffer->kvaddr)
+ vunmap(exynos_gem_obj->buffer->kvaddr);
+
+ /* release drm framebuffer and real buffer */
+ if (fb_helper->fb && fb_helper->fb->funcs) {
+ fb = fb_helper->fb;
+ if (fb) {
+ drm_framebuffer_unregister_private(fb);
+ drm_framebuffer_remove(fb);
+ }
+ }
+
+ /* release linux framebuffer */
+ if (fb_helper->fbdev) {
+ struct fb_info *info;
+ int ret;
+
+ info = fb_helper->fbdev;
+ ret = unregister_framebuffer(info);
+ if (ret < 0)
+ DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
+
+ if (info->cmap.len)
+ fb_dealloc_cmap(&info->cmap);
+
+ framebuffer_release(info);
+ }
+
+ drm_fb_helper_fini(fb_helper);
+}
+
+void exynos_drm_fbdev_fini(struct drm_device *dev)
+{
+ struct exynos_drm_private *private = dev->dev_private;
+ struct exynos_drm_fbdev *fbdev;
+
+ if (!private || !private->fb_helper)
+ return;
+
+ fbdev = to_exynos_fbdev(private->fb_helper);
+
+ exynos_drm_fbdev_destroy(dev, private->fb_helper);
+ kfree(fbdev);
+ private->fb_helper = NULL;
+}
+
+void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
+{
+ struct exynos_drm_private *private = dev->dev_private;
+
+ if (!private || !private->fb_helper)
+ return;
+
+ drm_fb_helper_restore_fbdev_mode_unlocked(private->fb_helper);
+}
Code Review / kvmfornfv.git / blobdiff