1 /* 2 * Copyright (C) 2012 Russell King 3 * Written from the i915 driver. 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 */ 9 #include <linux/errno.h> 10 #include <linux/fb.h> 11 #include <linux/kernel.h> 12 #include <linux/module.h> 13 14 #include <drm/drmP.h> 15 #include <drm/drm_fb_helper.h> 16 #include "armada_crtc.h" 17 #include "armada_drm.h" 18 #include "armada_fb.h" 19 #include "armada_gem.h" 20 21 static /*const*/ struct fb_ops armada_fb_ops = { 22 .owner = THIS_MODULE, 23 .fb_check_var = drm_fb_helper_check_var, 24 .fb_set_par = drm_fb_helper_set_par, 25 .fb_fillrect = drm_fb_helper_cfb_fillrect, 26 .fb_copyarea = drm_fb_helper_cfb_copyarea, 27 .fb_imageblit = drm_fb_helper_cfb_imageblit, 28 .fb_pan_display = drm_fb_helper_pan_display, 29 .fb_blank = drm_fb_helper_blank, 30 .fb_setcmap = drm_fb_helper_setcmap, 31 .fb_debug_enter = drm_fb_helper_debug_enter, 32 .fb_debug_leave = drm_fb_helper_debug_leave, 33 }; 34 35 static int armada_fb_create(struct drm_fb_helper *fbh, 36 struct drm_fb_helper_surface_size *sizes) 37 { 38 struct drm_device *dev = fbh->dev; 39 struct drm_mode_fb_cmd2 mode; 40 struct armada_framebuffer *dfb; 41 struct armada_gem_object *obj; 42 struct fb_info *info; 43 int size, ret; 44 void *ptr; 45 46 memset(&mode, 0, sizeof(mode)); 47 mode.width = sizes->surface_width; 48 mode.height = sizes->surface_height; 49 mode.pitches[0] = armada_pitch(mode.width, sizes->surface_bpp); 50 mode.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 51 sizes->surface_depth); 52 53 size = mode.pitches[0] * mode.height; 54 obj = armada_gem_alloc_private_object(dev, size); 55 if (!obj) { 56 DRM_ERROR("failed to allocate fb memory\n"); 57 return -ENOMEM; 58 } 59 60 ret = armada_gem_linear_back(dev, obj); 61 if (ret) { 62 drm_gem_object_unreference_unlocked(&obj->obj); 63 return ret; 64 } 65 66 ptr = armada_gem_map_object(dev, obj); 67 if (!ptr) { 68 drm_gem_object_unreference_unlocked(&obj->obj); 69 return -ENOMEM; 70 } 71 72 dfb = armada_framebuffer_create(dev, &mode, obj); 73 74 /* 75 * A reference is now held by the framebuffer object if 76 * successful, otherwise this drops the ref for the error path. 77 */ 78 drm_gem_object_unreference_unlocked(&obj->obj); 79 80 if (IS_ERR(dfb)) 81 return PTR_ERR(dfb); 82 83 info = drm_fb_helper_alloc_fbi(fbh); 84 if (IS_ERR(info)) { 85 ret = PTR_ERR(info); 86 goto err_fballoc; 87 } 88 89 strlcpy(info->fix.id, "armada-drmfb", sizeof(info->fix.id)); 90 info->par = fbh; 91 info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT; 92 info->fbops = &armada_fb_ops; 93 info->fix.smem_start = obj->phys_addr; 94 info->fix.smem_len = obj->obj.size; 95 info->screen_size = obj->obj.size; 96 info->screen_base = ptr; 97 fbh->fb = &dfb->fb; 98 99 drm_fb_helper_fill_fix(info, dfb->fb.pitches[0], dfb->fb.depth); 100 drm_fb_helper_fill_var(info, fbh, sizes->fb_width, sizes->fb_height); 101 102 DRM_DEBUG_KMS("allocated %dx%d %dbpp fb: 0x%08llx\n", 103 dfb->fb.width, dfb->fb.height, dfb->fb.bits_per_pixel, 104 (unsigned long long)obj->phys_addr); 105 106 return 0; 107 108 err_fballoc: 109 dfb->fb.funcs->destroy(&dfb->fb); 110 return ret; 111 } 112 113 static int armada_fb_probe(struct drm_fb_helper *fbh, 114 struct drm_fb_helper_surface_size *sizes) 115 { 116 int ret = 0; 117 118 if (!fbh->fb) { 119 ret = armada_fb_create(fbh, sizes); 120 if (ret == 0) 121 ret = 1; 122 } 123 return ret; 124 } 125 126 static const struct drm_fb_helper_funcs armada_fb_helper_funcs = { 127 .gamma_set = armada_drm_crtc_gamma_set, 128 .gamma_get = armada_drm_crtc_gamma_get, 129 .fb_probe = armada_fb_probe, 130 }; 131 132 int armada_fbdev_init(struct drm_device *dev) 133 { 134 struct armada_private *priv = dev->dev_private; 135 struct drm_fb_helper *fbh; 136 int ret; 137 138 fbh = devm_kzalloc(dev->dev, sizeof(*fbh), GFP_KERNEL); 139 if (!fbh) 140 return -ENOMEM; 141 142 priv->fbdev = fbh; 143 144 drm_fb_helper_prepare(dev, fbh, &armada_fb_helper_funcs); 145 146 ret = drm_fb_helper_init(dev, fbh, 1, 1); 147 if (ret) { 148 DRM_ERROR("failed to initialize drm fb helper\n"); 149 goto err_fb_helper; 150 } 151 152 ret = drm_fb_helper_single_add_all_connectors(fbh); 153 if (ret) { 154 DRM_ERROR("failed to add fb connectors\n"); 155 goto err_fb_setup; 156 } 157 158 ret = drm_fb_helper_initial_config(fbh, 32); 159 if (ret) { 160 DRM_ERROR("failed to set initial config\n"); 161 goto err_fb_setup; 162 } 163 164 return 0; 165 err_fb_setup: 166 drm_fb_helper_release_fbi(fbh); 167 drm_fb_helper_fini(fbh); 168 err_fb_helper: 169 priv->fbdev = NULL; 170 return ret; 171 } 172 173 void armada_fbdev_lastclose(struct drm_device *dev) 174 { 175 struct armada_private *priv = dev->dev_private; 176 177 if (priv->fbdev) 178 drm_fb_helper_restore_fbdev_mode_unlocked(priv->fbdev); 179 } 180 181 void armada_fbdev_fini(struct drm_device *dev) 182 { 183 struct armada_private *priv = dev->dev_private; 184 struct drm_fb_helper *fbh = priv->fbdev; 185 186 if (fbh) { 187 drm_fb_helper_unregister_fbi(fbh); 188 drm_fb_helper_release_fbi(fbh); 189 190 drm_fb_helper_fini(fbh); 191 192 if (fbh->fb) 193 fbh->fb->funcs->destroy(fbh->fb); 194 195 priv->fbdev = NULL; 196 } 197 } 198