3 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
5 * Inki Dae <inki.dae@samsung.com>
6 * Joonyoung Shim <jy0922.shim@samsung.com>
7 * Seung-Woo Kim <sw0312.kim@samsung.com>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
16 #include <drm/drm_crtc.h>
17 #include <drm/drm_fb_helper.h>
18 #include <drm/drm_crtc_helper.h>
19 #include <drm/exynos_drm.h>
21 #include "exynos_drm_drv.h"
22 #include "exynos_drm_fb.h"
23 #include "exynos_drm_fbdev.h"
24 #include "exynos_drm_gem.h"
25 #include "exynos_drm_iommu.h"
27 #define MAX_CONNECTOR 4
28 #define PREFERRED_BPP 32
30 #define to_exynos_fbdev(x) container_of(x, struct exynos_drm_fbdev,\
33 struct exynos_drm_fbdev {
34 struct drm_fb_helper drm_fb_helper;
35 struct exynos_drm_gem_obj *exynos_gem_obj;
38 static int exynos_drm_fb_mmap(struct fb_info *info,
39 struct vm_area_struct *vma)
41 struct drm_fb_helper *helper = info->par;
42 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
43 struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
44 struct exynos_drm_gem_buf *buffer = exynos_gem_obj->buffer;
45 unsigned long vm_size;
48 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
50 vm_size = vma->vm_end - vma->vm_start;
52 if (vm_size > buffer->size)
55 ret = dma_mmap_attrs(helper->dev->dev, vma, buffer->pages,
56 buffer->dma_addr, buffer->size, &buffer->dma_attrs);
58 DRM_ERROR("failed to mmap.\n");
65 static struct fb_ops exynos_drm_fb_ops = {
67 .fb_mmap = exynos_drm_fb_mmap,
68 .fb_fillrect = cfb_fillrect,
69 .fb_copyarea = cfb_copyarea,
70 .fb_imageblit = cfb_imageblit,
71 .fb_check_var = drm_fb_helper_check_var,
72 .fb_set_par = drm_fb_helper_set_par,
73 .fb_blank = drm_fb_helper_blank,
74 .fb_pan_display = drm_fb_helper_pan_display,
75 .fb_setcmap = drm_fb_helper_setcmap,
78 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
79 struct drm_framebuffer *fb)
81 struct fb_info *fbi = helper->fbdev;
82 struct drm_device *dev = helper->dev;
83 struct exynos_drm_gem_buf *buffer;
84 unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
87 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
88 drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);
90 /* RGB formats use only one buffer */
91 buffer = exynos_drm_fb_buffer(fb, 0);
93 DRM_DEBUG_KMS("buffer is null.\n");
97 /* map pages with kernel virtual space. */
98 if (!buffer->kvaddr) {
99 if (is_drm_iommu_supported(dev)) {
100 unsigned int nr_pages = buffer->size >> PAGE_SHIFT;
102 buffer->kvaddr = (void __iomem *) vmap(buffer->pages,
104 pgprot_writecombine(PAGE_KERNEL));
106 phys_addr_t dma_addr = buffer->dma_addr;
108 buffer->kvaddr = (void __iomem *)phys_to_virt(dma_addr);
110 buffer->kvaddr = (void __iomem *)NULL;
112 if (!buffer->kvaddr) {
113 DRM_ERROR("failed to map pages to kernel space.\n");
118 /* buffer count to framebuffer always is 1 at booting time. */
119 exynos_drm_fb_set_buf_cnt(fb, 1);
121 offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
122 offset += fbi->var.yoffset * fb->pitches[0];
124 fbi->screen_base = buffer->kvaddr + offset;
125 fbi->screen_size = size;
130 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
131 struct drm_fb_helper_surface_size *sizes)
133 struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
134 struct exynos_drm_gem_obj *exynos_gem_obj;
135 struct drm_device *dev = helper->dev;
137 struct drm_mode_fb_cmd2 mode_cmd = { 0 };
138 struct platform_device *pdev = dev->platformdev;
142 DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
143 sizes->surface_width, sizes->surface_height,
146 mode_cmd.width = sizes->surface_width;
147 mode_cmd.height = sizes->surface_height;
148 mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
149 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
150 sizes->surface_depth);
152 mutex_lock(&dev->struct_mutex);
154 fbi = framebuffer_alloc(0, &pdev->dev);
156 DRM_ERROR("failed to allocate fb info.\n");
161 size = mode_cmd.pitches[0] * mode_cmd.height;
163 exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
165 * If physically contiguous memory allocation fails and if IOMMU is
166 * supported then try to get buffer from non physically contiguous
169 if (IS_ERR(exynos_gem_obj) && is_drm_iommu_supported(dev)) {
170 dev_warn(&pdev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
171 exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
175 if (IS_ERR(exynos_gem_obj)) {
176 ret = PTR_ERR(exynos_gem_obj);
177 goto err_release_framebuffer;
180 exynos_fbdev->exynos_gem_obj = exynos_gem_obj;
182 helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd,
183 &exynos_gem_obj->base);
184 if (IS_ERR(helper->fb)) {
185 DRM_ERROR("failed to create drm framebuffer.\n");
186 ret = PTR_ERR(helper->fb);
187 goto err_destroy_gem;
193 fbi->flags = FBINFO_FLAG_DEFAULT;
194 fbi->fbops = &exynos_drm_fb_ops;
196 ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
198 DRM_ERROR("failed to allocate cmap.\n");
199 goto err_destroy_framebuffer;
202 ret = exynos_drm_fbdev_update(helper, helper->fb);
204 goto err_dealloc_cmap;
206 mutex_unlock(&dev->struct_mutex);
210 fb_dealloc_cmap(&fbi->cmap);
211 err_destroy_framebuffer:
212 drm_framebuffer_cleanup(helper->fb);
214 exynos_drm_gem_destroy(exynos_gem_obj);
215 err_release_framebuffer:
216 framebuffer_release(fbi);
219 * if failed, all resources allocated above would be released by
220 * drm_mode_config_cleanup() when drm_load() had been called prior
221 * to any specific driver such as fimd or hdmi driver.
224 mutex_unlock(&dev->struct_mutex);
228 static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
229 .fb_probe = exynos_drm_fbdev_create,
232 static bool exynos_drm_fbdev_is_anything_connected(struct drm_device *dev)
234 struct drm_connector *connector;
237 mutex_lock(&dev->mode_config.mutex);
238 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
239 if (connector->status != connector_status_connected)
245 mutex_unlock(&dev->mode_config.mutex);
250 int exynos_drm_fbdev_init(struct drm_device *dev)
252 struct exynos_drm_fbdev *fbdev;
253 struct exynos_drm_private *private = dev->dev_private;
254 struct drm_fb_helper *helper;
255 unsigned int num_crtc;
258 if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
261 if (!exynos_drm_fbdev_is_anything_connected(dev))
264 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
268 private->fb_helper = helper = &fbdev->drm_fb_helper;
269 helper->funcs = &exynos_drm_fb_helper_funcs;
271 num_crtc = dev->mode_config.num_crtc;
273 ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
275 DRM_ERROR("failed to initialize drm fb helper.\n");
279 ret = drm_fb_helper_single_add_all_connectors(helper);
281 DRM_ERROR("failed to register drm_fb_helper_connector.\n");
286 /* disable all the possible outputs/crtcs before entering KMS mode */
287 drm_helper_disable_unused_functions(dev);
289 ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
291 DRM_ERROR("failed to set up hw configuration.\n");
298 drm_fb_helper_fini(helper);
301 private->fb_helper = NULL;
307 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
308 struct drm_fb_helper *fb_helper)
310 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
311 struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
312 struct drm_framebuffer *fb;
314 if (is_drm_iommu_supported(dev) && exynos_gem_obj->buffer->kvaddr)
315 vunmap(exynos_gem_obj->buffer->kvaddr);
317 /* release drm framebuffer and real buffer */
318 if (fb_helper->fb && fb_helper->fb->funcs) {
321 drm_framebuffer_unregister_private(fb);
322 drm_framebuffer_remove(fb);
326 /* release linux framebuffer */
327 if (fb_helper->fbdev) {
328 struct fb_info *info;
331 info = fb_helper->fbdev;
332 ret = unregister_framebuffer(info);
334 DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
337 fb_dealloc_cmap(&info->cmap);
339 framebuffer_release(info);
342 drm_fb_helper_fini(fb_helper);
345 void exynos_drm_fbdev_fini(struct drm_device *dev)
347 struct exynos_drm_private *private = dev->dev_private;
348 struct exynos_drm_fbdev *fbdev;
350 if (!private || !private->fb_helper)
353 fbdev = to_exynos_fbdev(private->fb_helper);
355 if (fbdev->exynos_gem_obj)
356 exynos_drm_gem_destroy(fbdev->exynos_gem_obj);
358 exynos_drm_fbdev_destroy(dev, private->fb_helper);
360 private->fb_helper = NULL;
363 void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
365 struct exynos_drm_private *private = dev->dev_private;
367 if (!private || !private->fb_helper)
370 drm_modeset_lock_all(dev);
371 drm_fb_helper_restore_fbdev_mode(private->fb_helper);
372 drm_modeset_unlock_all(dev);