drm/bochs: new driver
DRM driver for (virtual) vga cards using the bochs dispi
interface, such as the qemu standard vga (qemu -vga std).
Don't bother supporting anything but 32bpp for now, even
though the virtual hardware is able to do that.
Known issue: mmap(/dev/fb0) doesn't work.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/bochs/bochs_fbdev.c b/drivers/gpu/drm/bochs/bochs_fbdev.c
new file mode 100644
index 0000000..4da5206
--- /dev/null
+++ b/drivers/gpu/drm/bochs/bochs_fbdev.c
@@ -0,0 +1,215 @@
+/*
+ * 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 "bochs.h"
+
+/* ---------------------------------------------------------------------- */
+
+static struct fb_ops bochsfb_ops = {
+ .owner = THIS_MODULE,
+ .fb_check_var = drm_fb_helper_check_var,
+ .fb_set_par = drm_fb_helper_set_par,
+ .fb_fillrect = sys_fillrect,
+ .fb_copyarea = sys_copyarea,
+ .fb_imageblit = sys_imageblit,
+ .fb_pan_display = drm_fb_helper_pan_display,
+ .fb_blank = drm_fb_helper_blank,
+ .fb_setcmap = drm_fb_helper_setcmap,
+};
+
+static int bochsfb_create_object(struct bochs_device *bochs,
+ struct drm_mode_fb_cmd2 *mode_cmd,
+ struct drm_gem_object **gobj_p)
+{
+ struct drm_device *dev = bochs->dev;
+ struct drm_gem_object *gobj;
+ u32 size;
+ int ret = 0;
+
+ size = mode_cmd->pitches[0] * mode_cmd->height;
+ ret = bochs_gem_create(dev, size, true, &gobj);
+ if (ret)
+ return ret;
+
+ *gobj_p = gobj;
+ return ret;
+}
+
+static int bochsfb_create(struct drm_fb_helper *helper,
+ struct drm_fb_helper_surface_size *sizes)
+{
+ struct bochs_device *bochs =
+ container_of(helper, struct bochs_device, fb.helper);
+ struct drm_device *dev = bochs->dev;
+ struct fb_info *info;
+ struct drm_framebuffer *fb;
+ struct drm_mode_fb_cmd2 mode_cmd;
+ struct device *device = &dev->pdev->dev;
+ struct drm_gem_object *gobj = NULL;
+ struct bochs_bo *bo = NULL;
+ int size, ret;
+
+ if (sizes->surface_bpp != 32)
+ return -EINVAL;
+
+ mode_cmd.width = sizes->surface_width;
+ mode_cmd.height = sizes->surface_height;
+ mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
+ mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
+ sizes->surface_depth);
+ size = mode_cmd.pitches[0] * mode_cmd.height;
+
+ /* alloc, pin & map bo */
+ ret = bochsfb_create_object(bochs, &mode_cmd, &gobj);
+ if (ret) {
+ DRM_ERROR("failed to create fbcon backing object %d\n", ret);
+ return ret;
+ }
+
+ bo = gem_to_bochs_bo(gobj);
+
+ ret = ttm_bo_reserve(&bo->bo, true, false, false, 0);
+ if (ret)
+ return ret;
+
+ ret = bochs_bo_pin(bo, TTM_PL_FLAG_VRAM, NULL);
+ if (ret) {
+ DRM_ERROR("failed to pin fbcon\n");
+ ttm_bo_unreserve(&bo->bo);
+ return ret;
+ }
+
+ ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages,
+ &bo->kmap);
+ if (ret) {
+ DRM_ERROR("failed to kmap fbcon\n");
+ ttm_bo_unreserve(&bo->bo);
+ return ret;
+ }
+
+ ttm_bo_unreserve(&bo->bo);
+
+ /* init fb device */
+ info = framebuffer_alloc(0, device);
+ if (info == NULL)
+ return -ENOMEM;
+
+ info->par = &bochs->fb.helper;
+
+ ret = bochs_framebuffer_init(bochs->dev, &bochs->fb.gfb, &mode_cmd, gobj);
+ if (ret)
+ return ret;
+
+ bochs->fb.size = size;
+
+ /* setup helper */
+ fb = &bochs->fb.gfb.base;
+ bochs->fb.helper.fb = fb;
+ bochs->fb.helper.fbdev = info;
+
+ strcpy(info->fix.id, "bochsdrmfb");
+
+ info->flags = FBINFO_DEFAULT;
+ info->fbops = &bochsfb_ops;
+
+ drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
+ drm_fb_helper_fill_var(info, &bochs->fb.helper, sizes->fb_width,
+ sizes->fb_height);
+
+ info->screen_base = bo->kmap.virtual;
+ info->screen_size = size;
+
+#if 0
+ /* FIXME: get this right for mmap(/dev/fb0) */
+ info->fix.smem_start = bochs_bo_mmap_offset(bo);
+ info->fix.smem_len = size;
+#endif
+
+ ret = fb_alloc_cmap(&info->cmap, 256, 0);
+ if (ret) {
+ DRM_ERROR("%s: can't allocate color map\n", info->fix.id);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static int bochs_fbdev_destroy(struct bochs_device *bochs)
+{
+ struct bochs_framebuffer *gfb = &bochs->fb.gfb;
+ struct fb_info *info;
+
+ DRM_DEBUG_DRIVER("\n");
+
+ if (bochs->fb.helper.fbdev) {
+ info = bochs->fb.helper.fbdev;
+
+ unregister_framebuffer(info);
+ if (info->cmap.len)
+ fb_dealloc_cmap(&info->cmap);
+ framebuffer_release(info);
+ }
+
+ if (gfb->obj) {
+ drm_gem_object_unreference_unlocked(gfb->obj);
+ gfb->obj = NULL;
+ }
+
+ drm_fb_helper_fini(&bochs->fb.helper);
+ drm_framebuffer_unregister_private(&gfb->base);
+ drm_framebuffer_cleanup(&gfb->base);
+
+ return 0;
+}
+
+void bochs_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
+ u16 blue, int regno)
+{
+}
+
+void bochs_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
+ u16 *blue, int regno)
+{
+ *red = regno;
+ *green = regno;
+ *blue = regno;
+}
+
+static struct drm_fb_helper_funcs bochs_fb_helper_funcs = {
+ .gamma_set = bochs_fb_gamma_set,
+ .gamma_get = bochs_fb_gamma_get,
+ .fb_probe = bochsfb_create,
+};
+
+int bochs_fbdev_init(struct bochs_device *bochs)
+{
+ int ret;
+
+ bochs->fb.helper.funcs = &bochs_fb_helper_funcs;
+ spin_lock_init(&bochs->fb.dirty_lock);
+
+ ret = drm_fb_helper_init(bochs->dev, &bochs->fb.helper,
+ 1, 1);
+ if (ret)
+ return ret;
+
+ drm_fb_helper_single_add_all_connectors(&bochs->fb.helper);
+ drm_helper_disable_unused_functions(bochs->dev);
+ drm_fb_helper_initial_config(&bochs->fb.helper, 32);
+
+ bochs->fb.initialized = true;
+ return 0;
+}
+
+void bochs_fbdev_fini(struct bochs_device *bochs)
+{
+ if (!bochs->fb.initialized)
+ return;
+
+ bochs_fbdev_destroy(bochs);
+ bochs->fb.initialized = false;
+}