1 /* $NetBSD: tegra_drm_fb.c,v 1.6 2017/12/26 14:54:52 jmcneill Exp $ */ 2 3 /*- 4 * Copyright (c) 2015 Jared D. McNeill <jmcneill@invisible.ca> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: tegra_drm_fb.c,v 1.6 2017/12/26 14:54:52 jmcneill Exp $"); 31 32 #include <drm/drmP.h> 33 #include <drm/drm_crtc.h> 34 #include <drm/drm_fb_helper.h> 35 #include <drm/drm_crtc_helper.h> 36 37 #include <arm/nvidia/tegra_drm.h> 38 39 static int tegra_fb_init(struct drm_device *, struct drm_framebuffer *, 40 struct drm_fb_helper_surface_size *); 41 42 static int tegra_fb_probe(struct drm_fb_helper *, 43 struct drm_fb_helper_surface_size *); 44 45 static struct drm_fb_helper_funcs tegra_fb_helper_funcs = { 46 .fb_probe = tegra_fb_probe 47 }; 48 49 int 50 tegra_drm_fb_init(struct drm_device *ddev) 51 { 52 struct tegra_fbdev *fbdev; 53 int error; 54 55 fbdev = kmem_zalloc(sizeof(*fbdev), KM_SLEEP); 56 fbdev->helper.funcs = &tegra_fb_helper_funcs; 57 58 error = drm_fb_helper_init(ddev, &fbdev->helper, 2, 1); 59 if (error) { 60 kmem_free(fbdev, sizeof(*fbdev)); 61 return error; 62 } 63 64 /* 65 * This might seem silly, but it saves us from having to allocate 66 * enough memory for the largest possible framebuffer (around 35MB). 67 * 68 * Allocate the fb_helper's framebuffer here but don't initialize 69 * it yet. The fb helper won't configure a CRTC unless this field is 70 * set, and we don't know the preferred size at this time. 71 * 72 * The fb_probe callback will eventually be called with the preferred 73 * surface size, so defer allocating the buffer object until then. 74 */ 75 fbdev->helper.fb = 76 kmem_zalloc(sizeof(struct tegra_framebuffer), KM_SLEEP); 77 78 drm_fb_helper_single_add_all_connectors(&fbdev->helper); 79 80 drm_helper_disable_unused_functions(ddev); 81 82 drm_fb_helper_initial_config(&fbdev->helper, 32); 83 84 return 0; 85 } 86 87 static int 88 tegra_fb_probe(struct drm_fb_helper *helper, 89 struct drm_fb_helper_surface_size *sizes) 90 { 91 struct tegra_drm_softc * const sc = tegra_drm_private(helper->dev); 92 struct drm_device *ddev = helper->dev; 93 struct tegra_drmfb_attach_args tfa; 94 95 if (tegra_fb_init(ddev, helper->fb, sizes) != 0) { 96 DRM_ERROR("failed to initialize framebuffer\n"); 97 return -ENOMEM; 98 } 99 100 memset(&tfa, 0, sizeof(tfa)); 101 tfa.tfa_drm_dev = ddev; 102 tfa.tfa_fb_helper = helper; 103 tfa.tfa_fb_sizes = *sizes; 104 tfa.tfa_fb_bst = sc->sc_bst; 105 tfa.tfa_fb_dmat = sc->sc_dmat; 106 tfa.tfa_fb_linebytes = helper->fb->pitches[0]; 107 108 helper->fbdev = config_found_ia(ddev->dev, "tegrafbbus", &tfa, NULL); 109 if (helper->fbdev == NULL) { 110 DRM_ERROR("unable to attach tegrafb\n"); 111 return -ENXIO; 112 } 113 114 return 0; 115 } 116 117 static int 118 tegra_fb_init(struct drm_device *ddev, struct drm_framebuffer *fb, 119 struct drm_fb_helper_surface_size *sizes) 120 { 121 struct tegra_framebuffer *tegra_fb = to_tegra_framebuffer(fb); 122 const u_int width = sizes->surface_width; 123 const u_int height = sizes->surface_height; 124 const u_int pitch = width * (32 / 8); 125 126 const size_t size = roundup(height * pitch, PAGE_SIZE); 127 128 tegra_fb->obj = drm_gem_cma_create(ddev, size); 129 if (tegra_fb->obj == NULL) 130 return -ENOMEM; 131 132 fb->pitches[0] = pitch; 133 fb->offsets[0] = 0; 134 fb->width = width; 135 fb->height = height; 136 fb->pixel_format = DRM_FORMAT_XRGB8888; 137 drm_fb_get_bpp_depth(fb->pixel_format, &fb->depth, 138 &fb->bits_per_pixel); 139 tegra_drm_framebuffer_init(ddev, tegra_fb); 140 141 return 0; 142 } 143