1 /* $NetBSD: tegra_drm_fb.c,v 1.7 2018/09/24 09:25:14 skrll 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 1.7 2018/09/24 09:25:14 skrll 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 57 drm_fb_helper_prepare(ddev, &fbdev->helper, &tegra_fb_helper_funcs); 58 59 error = drm_fb_helper_init(ddev, &fbdev->helper, 2, 1); 60 if (error) { 61 kmem_free(fbdev, sizeof(*fbdev)); 62 return error; 63 } 64 65 /* 66 * This might seem silly, but it saves us from having to allocate 67 * enough memory for the largest possible framebuffer (around 35MB). 68 * 69 * Allocate the fb_helper's framebuffer here but don't initialize 70 * it yet. The fb helper won't configure a CRTC unless this field is 71 * set, and we don't know the preferred size at this time. 72 * 73 * The fb_probe callback will eventually be called with the preferred 74 * surface size, so defer allocating the buffer object until then. 75 */ 76 fbdev->helper.fb = 77 kmem_zalloc(sizeof(struct tegra_framebuffer), KM_SLEEP); 78 79 drm_fb_helper_single_add_all_connectors(&fbdev->helper); 80 81 drm_helper_disable_unused_functions(ddev); 82 83 drm_fb_helper_initial_config(&fbdev->helper, 32); 84 85 return 0; 86 } 87 88 static int 89 tegra_fb_probe(struct drm_fb_helper *helper, 90 struct drm_fb_helper_surface_size *sizes) 91 { 92 struct tegra_drm_softc * const sc = tegra_drm_private(helper->dev); 93 struct drm_device *ddev = helper->dev; 94 struct tegra_drmfb_attach_args tfa; 95 96 if (tegra_fb_init(ddev, helper->fb, sizes) != 0) { 97 DRM_ERROR("failed to initialize framebuffer\n"); 98 return -ENOMEM; 99 } 100 101 memset(&tfa, 0, sizeof(tfa)); 102 tfa.tfa_drm_dev = ddev; 103 tfa.tfa_fb_helper = helper; 104 tfa.tfa_fb_sizes = *sizes; 105 tfa.tfa_fb_bst = sc->sc_bst; 106 tfa.tfa_fb_dmat = sc->sc_dmat; 107 tfa.tfa_fb_linebytes = helper->fb->pitches[0]; 108 109 helper->fbdev = config_found_ia(ddev->dev, "tegrafbbus", &tfa, NULL); 110 if (helper->fbdev == NULL) { 111 DRM_ERROR("unable to attach tegrafb\n"); 112 return -ENXIO; 113 } 114 115 return 0; 116 } 117 118 static int 119 tegra_fb_init(struct drm_device *ddev, struct drm_framebuffer *fb, 120 struct drm_fb_helper_surface_size *sizes) 121 { 122 struct tegra_framebuffer *tegra_fb = to_tegra_framebuffer(fb); 123 const u_int width = sizes->surface_width; 124 const u_int height = sizes->surface_height; 125 const u_int pitch = width * (32 / 8); 126 127 const size_t size = roundup(height * pitch, PAGE_SIZE); 128 129 tegra_fb->obj = drm_gem_cma_create(ddev, size); 130 if (tegra_fb->obj == NULL) 131 return -ENOMEM; 132 133 fb->pitches[0] = pitch; 134 fb->offsets[0] = 0; 135 fb->width = width; 136 fb->height = height; 137 fb->pixel_format = DRM_FORMAT_XRGB8888; 138 drm_fb_get_bpp_depth(fb->pixel_format, &fb->depth, 139 &fb->bits_per_pixel); 140 tegra_drm_framebuffer_init(ddev, tegra_fb); 141 142 return 0; 143 } 144