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