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>
20 #include "exynos_drm_drv.h"
21 #include "exynos_drm_fb.h"
22 #include "exynos_drm_gem.h"
23 #include "exynos_drm_iommu.h"
25 #define MAX_CONNECTOR 4
26 #define PREFERRED_BPP 32
28 #define to_exynos_fbdev(x) container_of(x, struct exynos_drm_fbdev,\
31 struct exynos_drm_fbdev {
32 struct drm_fb_helper drm_fb_helper;
33 struct exynos_drm_gem_obj *exynos_gem_obj;
36 static int exynos_drm_fb_mmap(struct fb_info *info,
37 struct vm_area_struct *vma)
39 struct drm_fb_helper *helper = info->par;
40 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
41 struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
42 struct exynos_drm_gem_buf *buffer = exynos_gem_obj->buffer;
43 unsigned long vm_size;
46 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
48 vm_size = vma->vm_end - vma->vm_start;
50 if (vm_size > buffer->size)
53 ret = dma_mmap_attrs(helper->dev->dev, vma, buffer->pages,
54 buffer->dma_addr, buffer->size, &buffer->dma_attrs);
56 DRM_ERROR("failed to mmap.\n");
63 static struct fb_ops exynos_drm_fb_ops = {
65 .fb_mmap = exynos_drm_fb_mmap,
66 .fb_fillrect = cfb_fillrect,
67 .fb_copyarea = cfb_copyarea,
68 .fb_imageblit = cfb_imageblit,
69 .fb_check_var = drm_fb_helper_check_var,
70 .fb_set_par = drm_fb_helper_set_par,
71 .fb_blank = drm_fb_helper_blank,
72 .fb_pan_display = drm_fb_helper_pan_display,
73 .fb_setcmap = drm_fb_helper_setcmap,
76 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
77 struct drm_framebuffer *fb)
79 struct fb_info *fbi = helper->fbdev;
80 struct drm_device *dev = helper->dev;
81 struct exynos_drm_gem_buf *buffer;
82 unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
85 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
86 drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);
88 /* RGB formats use only one buffer */
89 buffer = exynos_drm_fb_buffer(fb, 0);
91 DRM_LOG_KMS("buffer is null.\n");
95 /* map pages with kernel virtual space. */
96 if (!buffer->kvaddr) {
97 if (is_drm_iommu_supported(dev)) {
98 unsigned int nr_pages = buffer->size >> PAGE_SHIFT;
100 buffer->kvaddr = vmap(buffer->pages, nr_pages, VM_MAP,
101 pgprot_writecombine(PAGE_KERNEL));
103 phys_addr_t dma_addr = buffer->dma_addr;
105 buffer->kvaddr = phys_to_virt(dma_addr);
107 buffer->kvaddr = (void __iomem *)NULL;
109 if (!buffer->kvaddr) {
110 DRM_ERROR("failed to map pages to kernel space.\n");
115 /* buffer count to framebuffer always is 1 at booting time. */
116 exynos_drm_fb_set_buf_cnt(fb, 1);
118 offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
119 offset += fbi->var.yoffset * fb->pitches[0];
121 dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr;
122 fbi->screen_base = buffer->kvaddr + offset;
123 if (is_drm_iommu_supported(dev))
124 fbi->fix.smem_start = (unsigned long)
125 (page_to_phys(sg_page(buffer->sgt->sgl)) + offset);
127 fbi->fix.smem_start = (unsigned long)buffer->dma_addr;
129 fbi->screen_size = size;
130 fbi->fix.smem_len = size;
135 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
136 struct drm_fb_helper_surface_size *sizes)
138 struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
139 struct exynos_drm_gem_obj *exynos_gem_obj;
140 struct drm_device *dev = helper->dev;
142 struct drm_mode_fb_cmd2 mode_cmd = { 0 };
143 struct platform_device *pdev = dev->platformdev;
147 DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
148 sizes->surface_width, sizes->surface_height,
151 mode_cmd.width = sizes->surface_width;
152 mode_cmd.height = sizes->surface_height;
153 mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
154 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
155 sizes->surface_depth);
157 mutex_lock(&dev->struct_mutex);
159 fbi = framebuffer_alloc(0, &pdev->dev);
161 DRM_ERROR("failed to allocate fb info.\n");
166 size = mode_cmd.pitches[0] * mode_cmd.height;
168 /* 0 means to allocate physically continuous memory */
169 exynos_gem_obj = exynos_drm_gem_create(dev, 0, size);
170 if (IS_ERR(exynos_gem_obj)) {
171 ret = PTR_ERR(exynos_gem_obj);
172 goto err_release_framebuffer;
175 exynos_fbdev->exynos_gem_obj = exynos_gem_obj;
177 helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd,
178 &exynos_gem_obj->base);
179 if (IS_ERR(helper->fb)) {
180 DRM_ERROR("failed to create drm framebuffer.\n");
181 ret = PTR_ERR(helper->fb);
182 goto err_destroy_gem;
188 fbi->flags = FBINFO_FLAG_DEFAULT;
189 fbi->fbops = &exynos_drm_fb_ops;
191 ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
193 DRM_ERROR("failed to allocate cmap.\n");
194 goto err_destroy_framebuffer;
197 ret = exynos_drm_fbdev_update(helper, helper->fb);
199 goto err_dealloc_cmap;
201 mutex_unlock(&dev->struct_mutex);
205 fb_dealloc_cmap(&fbi->cmap);
206 err_destroy_framebuffer:
207 drm_framebuffer_cleanup(helper->fb);
209 exynos_drm_gem_destroy(exynos_gem_obj);
210 err_release_framebuffer:
211 framebuffer_release(fbi);
214 * if failed, all resources allocated above would be released by
215 * drm_mode_config_cleanup() when drm_load() had been called prior
216 * to any specific driver such as fimd or hdmi driver.
219 mutex_unlock(&dev->struct_mutex);
223 static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
224 .fb_probe = exynos_drm_fbdev_create,
227 int exynos_drm_fbdev_init(struct drm_device *dev)
229 struct exynos_drm_fbdev *fbdev;
230 struct exynos_drm_private *private = dev->dev_private;
231 struct drm_fb_helper *helper;
232 unsigned int num_crtc;
235 if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
238 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
240 DRM_ERROR("failed to allocate drm fbdev.\n");
244 private->fb_helper = helper = &fbdev->drm_fb_helper;
245 helper->funcs = &exynos_drm_fb_helper_funcs;
247 num_crtc = dev->mode_config.num_crtc;
249 ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
251 DRM_ERROR("failed to initialize drm fb helper.\n");
255 ret = drm_fb_helper_single_add_all_connectors(helper);
257 DRM_ERROR("failed to register drm_fb_helper_connector.\n");
262 /* disable all the possible outputs/crtcs before entering KMS mode */
263 drm_helper_disable_unused_functions(dev);
265 ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
267 DRM_ERROR("failed to set up hw configuration.\n");
274 drm_fb_helper_fini(helper);
277 private->fb_helper = NULL;
283 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
284 struct drm_fb_helper *fb_helper)
286 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
287 struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
288 struct drm_framebuffer *fb;
290 if (is_drm_iommu_supported(dev) && exynos_gem_obj->buffer->kvaddr)
291 vunmap(exynos_gem_obj->buffer->kvaddr);
293 /* release drm framebuffer and real buffer */
294 if (fb_helper->fb && fb_helper->fb->funcs) {
297 drm_framebuffer_unregister_private(fb);
298 drm_framebuffer_remove(fb);
302 /* release linux framebuffer */
303 if (fb_helper->fbdev) {
304 struct fb_info *info;
307 info = fb_helper->fbdev;
308 ret = unregister_framebuffer(info);
310 DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
313 fb_dealloc_cmap(&info->cmap);
315 framebuffer_release(info);
318 drm_fb_helper_fini(fb_helper);
321 void exynos_drm_fbdev_fini(struct drm_device *dev)
323 struct exynos_drm_private *private = dev->dev_private;
324 struct exynos_drm_fbdev *fbdev;
326 if (!private || !private->fb_helper)
329 fbdev = to_exynos_fbdev(private->fb_helper);
331 if (fbdev->exynos_gem_obj)
332 exynos_drm_gem_destroy(fbdev->exynos_gem_obj);
334 exynos_drm_fbdev_destroy(dev, private->fb_helper);
336 private->fb_helper = NULL;
339 void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
341 struct exynos_drm_private *private = dev->dev_private;
343 if (!private || !private->fb_helper)
346 drm_modeset_lock_all(dev);
347 drm_fb_helper_restore_fbdev_mode(private->fb_helper);
348 drm_modeset_unlock_all(dev);