1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2012 Russell King 4 * Written from the i915 driver. 5 */ 6 7 #include <linux/errno.h> 8 #include <linux/fb.h> 9 #include <linux/kernel.h> 10 #include <linux/module.h> 11 12 #include <drm/drm_crtc_helper.h> 13 #include <drm/drm_drv.h> 14 #include <drm/drm_fb_helper.h> 15 #include <drm/drm_fourcc.h> 16 #include <drm/drm_print.h> 17 18 #include "armada_crtc.h" 19 #include "armada_drm.h" 20 #include "armada_fb.h" 21 #include "armada_gem.h" 22 23 static void armada_fbdev_fb_destroy(struct fb_info *info) 24 { 25 struct drm_fb_helper *fbh = info->par; 26 27 drm_fb_helper_fini(fbh); 28 29 fbh->fb->funcs->destroy(fbh->fb); 30 31 drm_client_release(&fbh->client); 32 } 33 34 static const struct fb_ops armada_fb_ops = { 35 .owner = THIS_MODULE, 36 FB_DEFAULT_IOMEM_OPS, 37 DRM_FB_HELPER_DEFAULT_OPS, 38 .fb_destroy = armada_fbdev_fb_destroy, 39 }; 40 41 static const struct drm_fb_helper_funcs armada_fbdev_helper_funcs; 42 43 int armada_fbdev_driver_fbdev_probe(struct drm_fb_helper *fbh, 44 struct drm_fb_helper_surface_size *sizes) 45 { 46 struct drm_device *dev = fbh->dev; 47 struct drm_mode_fb_cmd2 mode; 48 struct armada_framebuffer *dfb; 49 struct armada_gem_object *obj; 50 struct fb_info *info; 51 int size, ret; 52 void *ptr; 53 54 memset(&mode, 0, sizeof(mode)); 55 mode.width = sizes->surface_width; 56 mode.height = sizes->surface_height; 57 mode.pitches[0] = armada_pitch(mode.width, sizes->surface_bpp); 58 mode.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 59 sizes->surface_depth); 60 61 size = mode.pitches[0] * mode.height; 62 obj = armada_gem_alloc_private_object(dev, size); 63 if (!obj) { 64 DRM_ERROR("failed to allocate fb memory\n"); 65 return -ENOMEM; 66 } 67 68 ret = armada_gem_linear_back(dev, obj); 69 if (ret) { 70 drm_gem_object_put(&obj->obj); 71 return ret; 72 } 73 74 ptr = armada_gem_map_object(dev, obj); 75 if (!ptr) { 76 drm_gem_object_put(&obj->obj); 77 return -ENOMEM; 78 } 79 80 dfb = armada_framebuffer_create(dev, 81 drm_get_format_info(dev, mode.pixel_format, 82 mode.modifier[0]), 83 &mode, obj); 84 85 /* 86 * A reference is now held by the framebuffer object if 87 * successful, otherwise this drops the ref for the error path. 88 */ 89 drm_gem_object_put(&obj->obj); 90 91 if (IS_ERR(dfb)) 92 return PTR_ERR(dfb); 93 94 info = drm_fb_helper_alloc_info(fbh); 95 if (IS_ERR(info)) { 96 ret = PTR_ERR(info); 97 goto err_fballoc; 98 } 99 100 info->fbops = &armada_fb_ops; 101 info->fix.smem_start = obj->phys_addr; 102 info->fix.smem_len = obj->obj.size; 103 info->screen_size = obj->obj.size; 104 info->screen_base = ptr; 105 fbh->funcs = &armada_fbdev_helper_funcs; 106 fbh->fb = &dfb->fb; 107 108 drm_fb_helper_fill_info(info, fbh, sizes); 109 110 DRM_DEBUG_KMS("allocated %dx%d %dbpp fb: 0x%08llx\n", 111 dfb->fb.width, dfb->fb.height, dfb->fb.format->cpp[0] * 8, 112 (unsigned long long)obj->phys_addr); 113 114 return 0; 115 116 err_fballoc: 117 dfb->fb.funcs->destroy(&dfb->fb); 118 return ret; 119 } 120