1 files changed, 372 insertions, 0 deletions

diff --git a/drivers/gpu/drm/tegra/fb.c b/drivers/gpu/drm/tegra/fb.c
new file mode 100644
index 000000000000..1fd4e196b934
--- /dev/null
+++ b/drivers/gpu/drm/tegra/fb.c
@@ -0,0 +1,372 @@
+/*
+ * Copyright (C) 2012-2013 Avionic Design GmbH
+ * Copyright (C) 2012 NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Based on the KMS/FB CMA helpers
+ *   Copyright (C) 2012 Analog Device Inc.
+ *
+ * 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.
+ */
+
+#include "drm.h"
+#include "gem.h"
+
+static inline struct tegra_fb *to_tegra_fb(struct drm_framebuffer *fb)
+{
+        return container_of(fb, struct tegra_fb, base);
+}
+
+static inline struct tegra_fbdev *to_tegra_fbdev(struct drm_fb_helper *helper)
+{
+        return container_of(helper, struct tegra_fbdev, base);
+}
+
+struct tegra_bo *tegra_fb_get_plane(struct drm_framebuffer *framebuffer,
+                                    unsigned int index)
+{
+        struct tegra_fb *fb = to_tegra_fb(framebuffer);
+
+        if (index >= drm_format_num_planes(framebuffer->pixel_format))
+                return NULL;
+
+        return fb->planes[index];
+}
+
+static void tegra_fb_destroy(struct drm_framebuffer *framebuffer)
+{
+        struct tegra_fb *fb = to_tegra_fb(framebuffer);
+        unsigned int i;
+
+        for (i = 0; i < fb->num_planes; i++) {
+                struct tegra_bo *bo = fb->planes[i];
+
+                if (bo)
+                        drm_gem_object_unreference_unlocked(&bo->gem);
+        }
+
+        drm_framebuffer_cleanup(framebuffer);
+        kfree(fb->planes);
+        kfree(fb);
+}
+
+static int tegra_fb_create_handle(struct drm_framebuffer *framebuffer,
+                                  struct drm_file *file, unsigned int *handle)
+{
+        struct tegra_fb *fb = to_tegra_fb(framebuffer);
+
+        return drm_gem_handle_create(file, &fb->planes[0]->gem, handle);
+}
+
+static struct drm_framebuffer_funcs tegra_fb_funcs = {
+        .destroy = tegra_fb_destroy,
+        .create_handle = tegra_fb_create_handle,
+};
+
+static struct tegra_fb *tegra_fb_alloc(struct drm_device *drm,
+                                       struct drm_mode_fb_cmd2 *mode_cmd,
+                                       struct tegra_bo **planes,
+                                       unsigned int num_planes)
+{
+        struct tegra_fb *fb;
+        unsigned int i;
+        int err;
+
+        fb = kzalloc(sizeof(*fb), GFP_KERNEL);
+        if (!fb)
+                return ERR_PTR(-ENOMEM);
+
+        fb->planes = kzalloc(num_planes * sizeof(*planes), GFP_KERNEL);
+        if (!fb->planes)
+                return ERR_PTR(-ENOMEM);
+
+        fb->num_planes = num_planes;
+
+        drm_helper_mode_fill_fb_struct(&fb->base, mode_cmd);
+
+        for (i = 0; i < fb->num_planes; i++)
+                fb->planes[i] = planes[i];
+
+        err = drm_framebuffer_init(drm, &fb->base, &tegra_fb_funcs);
+        if (err < 0) {
+                dev_err(drm->dev, "failed to initialize framebuffer: %d\n",
+                        err);
+                kfree(fb->planes);
+                kfree(fb);
+                return ERR_PTR(err);
+        }
+
+        return fb;
+}
+
+static struct drm_framebuffer *tegra_fb_create(struct drm_device *drm,
+                                               struct drm_file *file,
+                                               struct drm_mode_fb_cmd2 *cmd)
+{
+        unsigned int hsub, vsub, i;
+        struct tegra_bo *planes[4];
+        struct drm_gem_object *gem;
+        struct tegra_fb *fb;
+        int err;
+
+        hsub = drm_format_horz_chroma_subsampling(cmd->pixel_format);
+        vsub = drm_format_vert_chroma_subsampling(cmd->pixel_format);
+
+        for (i = 0; i < drm_format_num_planes(cmd->pixel_format); i++) {
+                unsigned int width = cmd->width / (i ? hsub : 1);
+                unsigned int height = cmd->height / (i ? vsub : 1);
+                unsigned int size, bpp;
+
+                gem = drm_gem_object_lookup(drm, file, cmd->handles[i]);
+                if (!gem) {
+                        err = -ENXIO;
+                        goto unreference;
+                }
+
+                bpp = drm_format_plane_cpp(cmd->pixel_format, i);
+
+                size = (height - 1) * cmd->pitches[i] +
+                       width * bpp + cmd->offsets[i];
+
+                if (gem->size < size) {
+                        err = -EINVAL;
+                        goto unreference;
+                }
+
+                planes[i] = to_tegra_bo(gem);
+        }
+
+        fb = tegra_fb_alloc(drm, cmd, planes, i);
+        if (IS_ERR(fb)) {
+                err = PTR_ERR(fb);
+                goto unreference;
+        }
+
+        return &fb->base;
+
+unreference:
+        while (i--)
+                drm_gem_object_unreference_unlocked(&planes[i]->gem);
+
+        return ERR_PTR(err);
+}
+
+static struct fb_ops tegra_fb_ops = {
+        .owner = THIS_MODULE,
+        .fb_fillrect = sys_fillrect,
+        .fb_copyarea = sys_copyarea,
+        .fb_imageblit = sys_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 tegra_fbdev_probe(struct drm_fb_helper *helper,
+                             struct drm_fb_helper_surface_size *sizes)
+{
+        struct tegra_fbdev *fbdev = to_tegra_fbdev(helper);
+        struct drm_device *drm = helper->dev;
+        struct drm_mode_fb_cmd2 cmd = { 0 };
+        unsigned int bytes_per_pixel;
+        struct drm_framebuffer *fb;
+        unsigned long offset;
+        struct fb_info *info;
+        struct tegra_bo *bo;
+        size_t size;
+        int err;
+
+        bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
+
+        cmd.width = sizes->surface_width;
+        cmd.height = sizes->surface_height;
+        cmd.pitches[0] = sizes->surface_width * bytes_per_pixel;
+        cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
+                                                     sizes->surface_depth);
+
+        size = cmd.pitches[0] * cmd.height;
+
+        bo = tegra_bo_create(drm, size);
+        if (IS_ERR(bo))
+                return PTR_ERR(bo);
+
+        info = framebuffer_alloc(0, drm->dev);
+        if (!info) {
+                dev_err(drm->dev, "failed to allocate framebuffer info\n");
+                tegra_bo_free_object(&bo->gem);
+                return -ENOMEM;
+        }
+
+        fbdev->fb = tegra_fb_alloc(drm, &cmd, &bo, 1);
+        if (IS_ERR(fbdev->fb)) {
+                dev_err(drm->dev, "failed to allocate DRM framebuffer\n");
+                err = PTR_ERR(fbdev->fb);
+                goto release;
+        }
+
+        fb = &fbdev->fb->base;
+        helper->fb = fb;
+        helper->fbdev = info;
+
+        info->par = helper;
+        info->flags = FBINFO_FLAG_DEFAULT;
+        info->fbops = &tegra_fb_ops;
+
+        err = fb_alloc_cmap(&info->cmap, 256, 0);
+        if (err < 0) {
+                dev_err(drm->dev, "failed to allocate color map: %d\n", err);
+                goto destroy;
+        }
+
+        drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
+        drm_fb_helper_fill_var(info, helper, fb->width, fb->height);
+
+        offset = info->var.xoffset * bytes_per_pixel +
+                 info->var.yoffset * fb->pitches[0];
+
+        drm->mode_config.fb_base = (resource_size_t)bo->paddr;
+        info->screen_base = bo->vaddr + offset;
+        info->screen_size = size;
+        info->fix.smem_start = (unsigned long)(bo->paddr + offset);
+        info->fix.smem_len = size;
+
+        return 0;
+
+destroy:
+        drm_framebuffer_unregister_private(fb);
+        tegra_fb_destroy(fb);
+release:
+        framebuffer_release(info);
+        return err;
+}
+
+static struct drm_fb_helper_funcs tegra_fb_helper_funcs = {
+        .fb_probe = tegra_fbdev_probe,
+};
+
+static struct tegra_fbdev *tegra_fbdev_create(struct drm_device *drm,
+                                              unsigned int preferred_bpp,
+                                              unsigned int num_crtc,
+                                              unsigned int max_connectors)
+{
+        struct drm_fb_helper *helper;
+        struct tegra_fbdev *fbdev;
+        int err;
+
+        fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
+        if (!fbdev) {
+                dev_err(drm->dev, "failed to allocate DRM fbdev\n");
+                return ERR_PTR(-ENOMEM);
+        }
+
+        fbdev->base.funcs = &tegra_fb_helper_funcs;
+        helper = &fbdev->base;
+
+        err = drm_fb_helper_init(drm, &fbdev->base, num_crtc, max_connectors);
+        if (err < 0) {
+                dev_err(drm->dev, "failed to initialize DRM FB helper\n");
+                goto free;
+        }
+
+        err = drm_fb_helper_single_add_all_connectors(&fbdev->base);
+        if (err < 0) {
+                dev_err(drm->dev, "failed to add connectors\n");
+                goto fini;
+        }
+
+        drm_helper_disable_unused_functions(drm);
+
+        err = drm_fb_helper_initial_config(&fbdev->base, preferred_bpp);
+        if (err < 0) {
+                dev_err(drm->dev, "failed to set initial configuration\n");
+                goto fini;
+        }
+
+        return fbdev;
+
+fini:
+        drm_fb_helper_fini(&fbdev->base);
+free:
+        kfree(fbdev);
+        return ERR_PTR(err);
+}
+
+static void tegra_fbdev_free(struct tegra_fbdev *fbdev)
+{
+        struct fb_info *info = fbdev->base.fbdev;
+
+        if (info) {
+                int err;
+
+                err = unregister_framebuffer(info);
+                if (err < 0)
+                        DRM_DEBUG_KMS("failed to unregister framebuffer\n");
+
+                if (info->cmap.len)
+                        fb_dealloc_cmap(&info->cmap);
+
+                framebuffer_release(info);
+        }
+
+        if (fbdev->fb) {
+                drm_framebuffer_unregister_private(&fbdev->fb->base);
+                tegra_fb_destroy(&fbdev->fb->base);
+        }
+
+        drm_fb_helper_fini(&fbdev->base);
+        kfree(fbdev);
+}
+
+static void tegra_fb_output_poll_changed(struct drm_device *drm)
+{
+        struct tegra_drm *tegra = drm->dev_private;
+
+        if (tegra->fbdev)
+                drm_fb_helper_hotplug_event(&tegra->fbdev->base);
+}
+
+static const struct drm_mode_config_funcs tegra_drm_mode_funcs = {
+        .fb_create = tegra_fb_create,
+        .output_poll_changed = tegra_fb_output_poll_changed,
+};
+
+int tegra_drm_fb_init(struct drm_device *drm)
+{
+        struct tegra_drm *tegra = drm->dev_private;
+        struct tegra_fbdev *fbdev;
+
+        drm->mode_config.min_width = 0;
+        drm->mode_config.min_height = 0;
+
+        drm->mode_config.max_width = 4096;
+        drm->mode_config.max_height = 4096;
+
+        drm->mode_config.funcs = &tegra_drm_mode_funcs;
+
+        fbdev = tegra_fbdev_create(drm, 32, drm->mode_config.num_crtc,
+                                   drm->mode_config.num_connector);
+        if (IS_ERR(fbdev))
+                return PTR_ERR(fbdev);
+
+        tegra->fbdev = fbdev;
+
+        return 0;
+}
+
+void tegra_drm_fb_exit(struct drm_device *drm)
+{
+        struct tegra_drm *tegra = drm->dev_private;
+
+        tegra_fbdev_free(tegra->fbdev);
+}
+
+void tegra_fbdev_restore_mode(struct tegra_fbdev *fbdev)
+{
+        if (fbdev) {
+                drm_modeset_lock_all(fbdev->base.dev);
+                drm_fb_helper_restore_fbdev_mode(&fbdev->base);
+                drm_modeset_unlock_all(fbdev->base.dev);
+        }
+}