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