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      1 /* $NetBSD: tegra_drm_fb.c,v 1.10 2021/12/19 12:44:14 riastradh Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2015 Jared D. McNeill <jmcneill (at) 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 1.10 2021/12/19 12:44:14 riastradh Exp $");
     31 
     32 #include <drm/drm_crtc.h>
     33 #include <drm/drm_crtc_helper.h>
     34 #include <drm/drm_drv.h>
     35 #include <drm/drm_fb_helper.h>
     36 #include <drm/drm_fourcc.h>
     37 
     38 #include <arm/nvidia/tegra_drm.h>
     39 
     40 static int	tegra_fb_init(struct drm_device *, struct drm_framebuffer *,
     41 		    struct drm_fb_helper_surface_size *);
     42 
     43 static int	tegra_fb_probe(struct drm_fb_helper *,
     44 		    struct drm_fb_helper_surface_size *);
     45 
     46 static struct drm_fb_helper_funcs tegra_fb_helper_funcs = {
     47 	.fb_probe = tegra_fb_probe
     48 };
     49 
     50 int
     51 tegra_drm_fb_init(struct drm_device *ddev)
     52 {
     53 	struct tegra_fbdev *fbdev;
     54 	int error;
     55 
     56 	fbdev = kmem_zalloc(sizeof(*fbdev), KM_SLEEP);
     57 
     58 	drm_fb_helper_prepare(ddev, &fbdev->helper, &tegra_fb_helper_funcs);
     59 
     60 	error = drm_fb_helper_init(ddev, &fbdev->helper, 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 
     80 	drm_fb_helper_single_add_all_connectors(&fbdev->helper);
     81 
     82 	drm_helper_disable_unused_functions(ddev);
     83 
     84 	drm_fb_helper_initial_config(&fbdev->helper, 32);
     85 
     86 	return 0;
     87 }
     88 
     89 static int
     90 tegra_fb_probe(struct drm_fb_helper *helper,
     91     struct drm_fb_helper_surface_size *sizes)
     92 {
     93 	struct tegra_drm_softc * const sc = tegra_drm_private(helper->dev);
     94 	struct drm_device *ddev = helper->dev;
     95 	struct tegra_drmfb_attach_args tfa;
     96 
     97 	if (tegra_fb_init(ddev, helper->fb, sizes) != 0) {
     98 		DRM_ERROR("failed to initialize framebuffer\n");
     99 		return -ENOMEM;
    100 	}
    101 
    102 	memset(&tfa, 0, sizeof(tfa));
    103 	tfa.tfa_drm_dev = ddev;
    104 	tfa.tfa_fb_helper = helper;
    105 	tfa.tfa_fb_sizes = *sizes;
    106 	tfa.tfa_fb_bst = sc->sc_bst;
    107 	tfa.tfa_fb_dmat = sc->sc_dmat;
    108 	tfa.tfa_fb_linebytes = helper->fb->pitches[0];
    109 
    110 	helper->fbdev = config_found(ddev->dev, &tfa, NULL,
    111 	    CFARGS(.iattr = "tegrafbbus"));
    112 	if (helper->fbdev == NULL) {
    113 		DRM_ERROR("unable to attach tegrafb\n");
    114 		return -ENXIO;
    115 	}
    116 
    117 	return 0;
    118 }
    119 
    120 static int
    121 tegra_fb_init(struct drm_device *ddev, struct drm_framebuffer *fb,
    122     struct drm_fb_helper_surface_size *sizes)
    123 {
    124 	struct tegra_framebuffer *tegra_fb = to_tegra_framebuffer(fb);
    125 	const u_int width = sizes->surface_width;
    126 	const u_int height = sizes->surface_height;
    127 	const u_int pitch = width * (32 / 8);
    128 
    129 	const size_t size = roundup(height * pitch, PAGE_SIZE);
    130 
    131 	tegra_fb->obj = drm_gem_cma_create(ddev, size);
    132 	if (tegra_fb->obj == NULL)
    133 		return -ENOMEM;
    134 
    135 	fb->pitches[0] = pitch;
    136 	fb->offsets[0] = 0;
    137 	fb->width = width;
    138 	fb->height = height;
    139 	fb->modifier = 0;
    140 	fb->flags = 0;
    141 	fb->format = drm_format_info(DRM_FORMAT_XRGB8888); /* XXX endian? */
    142 	fb->dev = ddev;
    143 	tegra_drm_framebuffer_init(ddev, tegra_fb);
    144 
    145 	return 0;
    146 }
    147