1 /* $NetBSD: tegra_drm_fb.c,v 1.3 2015/11/16 21:14:33 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 1.3 2015/11/16 21:14:33 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 if (fbdev == NULL) 57 return -ENOMEM; 58 fbdev->helper.funcs = &tegra_fb_helper_funcs; 59 60 error = drm_fb_helper_init(ddev, &fbdev->helper, 2, 1); 61 if (error) { 62 kmem_free(fbdev, sizeof(*fbdev)); 63 return error; 64 } 65 66 /* 67 * This might seem silly, but it saves us from having to allocate 68 * enough memory for the largest possible framebuffer (around 35MB). 69 * 70 * Allocate the fb_helper's framebuffer here but don't initialize 71 * it yet. The fb helper won't configure a CRTC unless this field is 72 * set, and we don't know the preferred size at this time. 73 * 74 * The fb_probe callback will eventually be called with the preferred 75 * surface size, so defer allocating the buffer object until then. 76 */ 77 fbdev->helper.fb = 78 kmem_zalloc(sizeof(struct tegra_framebuffer), KM_SLEEP); 79 if (fbdev->helper.fb == NULL) { 80 DRM_ERROR("failed to create framebuffer\n"); 81 } 82 83 drm_fb_helper_single_add_all_connectors(&fbdev->helper); 84 85 drm_helper_disable_unused_functions(ddev); 86 87 drm_fb_helper_initial_config(&fbdev->helper, 32); 88 89 return 0; 90 } 91 92 static int 93 tegra_fb_probe(struct drm_fb_helper *helper, 94 struct drm_fb_helper_surface_size *sizes) 95 { 96 struct tegra_drm_softc * const sc = tegra_drm_private(helper->dev); 97 struct drm_device *ddev = helper->dev; 98 struct tegra_drmfb_attach_args tfa; 99 100 if (tegra_fb_init(ddev, helper->fb, sizes) != 0) { 101 DRM_ERROR("failed to initialize framebuffer\n"); 102 return -ENOMEM; 103 } 104 105 memset(&tfa, 0, sizeof(tfa)); 106 tfa.tfa_drm_dev = ddev; 107 tfa.tfa_fb_helper = helper; 108 tfa.tfa_fb_sizes = *sizes; 109 tfa.tfa_fb_bst = sc->sc_bst; 110 tfa.tfa_fb_dmat = sc->sc_dmat; 111 112 helper->fbdev = config_found_ia(ddev->dev, "tegrafbbus", &tfa, NULL); 113 if (helper->fbdev == NULL) { 114 DRM_ERROR("unable to attach tegrafb\n"); 115 return -ENXIO; 116 } 117 118 return 0; 119 } 120 121 static int 122 tegra_fb_init(struct drm_device *ddev, struct drm_framebuffer *fb, 123 struct drm_fb_helper_surface_size *sizes) 124 { 125 struct tegra_framebuffer *tegra_fb = to_tegra_framebuffer(fb); 126 const u_int width = sizes->surface_width; 127 const u_int height = sizes->surface_height; 128 const u_int pitch = width * (32 / 8); 129 130 const size_t size = roundup(height * pitch, PAGE_SIZE); 131 132 tegra_fb->obj = tegra_drm_obj_alloc(ddev, size); 133 if (tegra_fb->obj == NULL) 134 return -ENOMEM; 135 136 fb->pitches[0] = pitch; 137 fb->offsets[0] = 0; 138 fb->width = width; 139 fb->height = height; 140 fb->pixel_format = DRM_FORMAT_XRGB8888; 141 drm_fb_get_bpp_depth(fb->pixel_format, &fb->depth, 142 &fb->bits_per_pixel); 143 tegra_drm_framebuffer_init(ddev, tegra_fb); 144 145 return 0; 146 } 147