1/* 2 * Copyright (C) 2013 Red Hat 3 * Author: Rob Clark <robdclark@gmail.com> 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 as published by 7 * the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 * 14 * You should have received a copy of the GNU General Public License along with 15 * this program. If not, see <http://www.gnu.org/licenses/>. 16 */ 17 18#include "msm_drv.h" 19 20#include "drm_crtc.h" 21#include "drm_fb_helper.h" 22#include "msm_gem.h" 23 24extern int msm_gem_mmap_obj(struct drm_gem_object *obj, 25 struct vm_area_struct *vma); 26static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma); 27 28/* 29 * fbdev funcs, to implement legacy fbdev interface on top of drm driver 30 */ 31 32#define to_msm_fbdev(x) container_of(x, struct msm_fbdev, base) 33 34struct msm_fbdev { 35 struct drm_fb_helper base; 36 struct drm_framebuffer *fb; 37 struct drm_gem_object *bo; 38}; 39 40static struct fb_ops msm_fb_ops = { 41 .owner = THIS_MODULE, 42 43 /* Note: to properly handle manual update displays, we wrap the 44 * basic fbdev ops which write to the framebuffer 45 */ 46 .fb_read = fb_sys_read, 47 .fb_write = fb_sys_write, 48 .fb_fillrect = sys_fillrect, 49 .fb_copyarea = sys_copyarea, 50 .fb_imageblit = sys_imageblit, 51 .fb_mmap = msm_fbdev_mmap, 52 53 .fb_check_var = drm_fb_helper_check_var, 54 .fb_set_par = drm_fb_helper_set_par, 55 .fb_pan_display = drm_fb_helper_pan_display, 56 .fb_blank = drm_fb_helper_blank, 57 .fb_setcmap = drm_fb_helper_setcmap, 58}; 59 60static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma) 61{ 62 struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par; 63 struct msm_fbdev *fbdev = to_msm_fbdev(helper); 64 struct drm_gem_object *drm_obj = fbdev->bo; 65 struct drm_device *dev = helper->dev; 66 int ret = 0; 67 68 if (drm_device_is_unplugged(dev)) 69 return -ENODEV; 70 71 mutex_lock(&dev->struct_mutex); 72 73 ret = drm_gem_mmap_obj(drm_obj, drm_obj->size, vma); 74 75 mutex_unlock(&dev->struct_mutex); 76 77 if (ret) { 78 pr_err("%s:drm_gem_mmap_obj fail\n", __func__); 79 return ret; 80 } 81 82 return msm_gem_mmap_obj(drm_obj, vma); 83} 84 85static int msm_fbdev_create(struct drm_fb_helper *helper, 86 struct drm_fb_helper_surface_size *sizes) 87{ 88 struct msm_fbdev *fbdev = to_msm_fbdev(helper); 89 struct drm_device *dev = helper->dev; 90 struct drm_framebuffer *fb = NULL; 91 struct fb_info *fbi = NULL; 92 struct drm_mode_fb_cmd2 mode_cmd = {0}; 93 uint32_t paddr; 94 int ret, size; 95 96 sizes->surface_bpp = 32; 97 sizes->surface_depth = 24; 98 99 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width, 100 sizes->surface_height, sizes->surface_bpp, 101 sizes->fb_width, sizes->fb_height); 102 103 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 104 sizes->surface_depth); 105 106 mode_cmd.width = sizes->surface_width; 107 mode_cmd.height = sizes->surface_height; 108 109 mode_cmd.pitches[0] = align_pitch( 110 mode_cmd.width, sizes->surface_bpp); 111 112 /* allocate backing bo */ 113 size = mode_cmd.pitches[0] * mode_cmd.height; 114 DBG("allocating %d bytes for fb %d", size, dev->primary->index); 115 mutex_lock(&dev->struct_mutex); 116 fbdev->bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC); 117 mutex_unlock(&dev->struct_mutex); 118 if (IS_ERR(fbdev->bo)) { 119 ret = PTR_ERR(fbdev->bo); 120 fbdev->bo = NULL; 121 dev_err(dev->dev, "failed to allocate buffer object: %d\n", ret); 122 goto fail; 123 } 124 125 fb = msm_framebuffer_init(dev, &mode_cmd, &fbdev->bo); 126 if (IS_ERR(fb)) { 127 dev_err(dev->dev, "failed to allocate fb\n"); 128 /* note: if fb creation failed, we can't rely on fb destroy 129 * to unref the bo: 130 */ 131 drm_gem_object_unreference(fbdev->bo); 132 ret = PTR_ERR(fb); 133 goto fail; 134 } 135 136 mutex_lock(&dev->struct_mutex); 137 138 /* 139 * NOTE: if we can be guaranteed to be able to map buffer 140 * in panic (ie. lock-safe, etc) we could avoid pinning the 141 * buffer now: 142 */ 143 ret = msm_gem_get_iova_locked(fbdev->bo, 0, &paddr); 144 if (ret) { 145 dev_err(dev->dev, "failed to get buffer obj iova: %d\n", ret); 146 goto fail_unlock; 147 } 148 149 fbi = framebuffer_alloc(0, dev->dev); 150 if (!fbi) { 151 dev_err(dev->dev, "failed to allocate fb info\n"); 152 ret = -ENOMEM; 153 goto fail_unlock; 154 } 155 156 DBG("fbi=%p, dev=%p", fbi, dev); 157 158 fbdev->fb = fb; 159 helper->fb = fb; 160 helper->fbdev = fbi; 161 162 fbi->par = helper; 163 fbi->flags = FBINFO_DEFAULT; 164 fbi->fbops = &msm_fb_ops; 165 166 strcpy(fbi->fix.id, "msm"); 167 168 ret = fb_alloc_cmap(&fbi->cmap, 256, 0); 169 if (ret) { 170 ret = -ENOMEM; 171 goto fail_unlock; 172 } 173 174 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth); 175 drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height); 176 177 dev->mode_config.fb_base = paddr; 178 179 fbi->screen_base = msm_gem_vaddr_locked(fbdev->bo); 180 fbi->screen_size = fbdev->bo->size; 181 fbi->fix.smem_start = paddr; 182 fbi->fix.smem_len = fbdev->bo->size; 183 184 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres); 185 DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height); 186 187 mutex_unlock(&dev->struct_mutex); 188 189 return 0; 190 191fail_unlock: 192 mutex_unlock(&dev->struct_mutex); 193fail: 194 195 if (ret) { 196 if (fbi) 197 framebuffer_release(fbi); 198 if (fb) { 199 drm_framebuffer_unregister_private(fb); 200 drm_framebuffer_remove(fb); 201 } 202 } 203 204 return ret; 205} 206 207static void msm_crtc_fb_gamma_set(struct drm_crtc *crtc, 208 u16 red, u16 green, u16 blue, int regno) 209{ 210 DBG("fbdev: set gamma"); 211} 212 213static void msm_crtc_fb_gamma_get(struct drm_crtc *crtc, 214 u16 *red, u16 *green, u16 *blue, int regno) 215{ 216 DBG("fbdev: get gamma"); 217} 218 219static const struct drm_fb_helper_funcs msm_fb_helper_funcs = { 220 .gamma_set = msm_crtc_fb_gamma_set, 221 .gamma_get = msm_crtc_fb_gamma_get, 222 .fb_probe = msm_fbdev_create, 223}; 224 225/* initialize fbdev helper */ 226struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev) 227{ 228 struct msm_drm_private *priv = dev->dev_private; 229 struct msm_fbdev *fbdev = NULL; 230 struct drm_fb_helper *helper; 231 int ret; 232 233 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 234 if (!fbdev) 235 goto fail; 236 237 helper = &fbdev->base; 238 239 drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs); 240 241 ret = drm_fb_helper_init(dev, helper, 242 priv->num_crtcs, priv->num_connectors); 243 if (ret) { 244 dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret); 245 goto fail; 246 } 247 248 drm_fb_helper_single_add_all_connectors(helper); 249 250 /* disable all the possible outputs/crtcs before entering KMS mode */ 251 drm_helper_disable_unused_functions(dev); 252 253 drm_fb_helper_initial_config(helper, 32); 254 255 priv->fbdev = helper; 256 257 return helper; 258 259fail: 260 kfree(fbdev); 261 return NULL; 262} 263 264void msm_fbdev_free(struct drm_device *dev) 265{ 266 struct msm_drm_private *priv = dev->dev_private; 267 struct drm_fb_helper *helper = priv->fbdev; 268 struct msm_fbdev *fbdev; 269 struct fb_info *fbi; 270 271 DBG(); 272 273 fbi = helper->fbdev; 274 275 /* only cleanup framebuffer if it is present */ 276 if (fbi) { 277 unregister_framebuffer(fbi); 278 framebuffer_release(fbi); 279 } 280 281 drm_fb_helper_fini(helper); 282 283 fbdev = to_msm_fbdev(priv->fbdev); 284 285 /* this will free the backing object */ 286 if (fbdev->fb) { 287 drm_framebuffer_unregister_private(fbdev->fb); 288 drm_framebuffer_remove(fbdev->fb); 289 } 290 291 kfree(fbdev); 292 293 priv->fbdev = NULL; 294} 295