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tegra_fb.c revision 1.1 
      1 /* $NetBSD: tegra_fb.c,v 1.1 2015/11/09 23:05:58 jmcneill 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_fb.c,v 1.1 2015/11/09 23:05:58 jmcneill Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/bus.h>
     34 #include <sys/device.h>
     35 
     36 #include <drm/drmP.h>
     37 #include <drm/drmfb.h>
     38 
     39 #include <arm/nvidia/tegra_var.h>
     40 #include <arm/nvidia/tegra_drm.h>
     41 
     42 static int	tegra_fb_match(device_t, cfdata_t, void *);
     43 static void	tegra_fb_attach(device_t, device_t, void *);
     44 
     45 static bool	tegra_fb_shutdown(device_t, int);
     46 
     47 struct tegra_fb_softc {
     48 	struct drmfb_softc	sc_drmfb;
     49 	device_t		sc_dev;
     50 	struct tegra_drm_softc	*sc_drm;
     51 	struct tegra_drmfb_attach_args sc_tfa;
     52 };
     53 
     54 static paddr_t	tegra_fb_mmapfb(struct drmfb_softc *, off_t, int);
     55 static int	tegra_fb_ioctl(struct drmfb_softc *, u_long, void *, int,
     56 			       lwp_t *);
     57 
     58 
     59 static const struct drmfb_params tegrafb_drmfb_params = {
     60 	.dp_mmapfb = tegra_fb_mmapfb,
     61 	.dp_ioctl = tegra_fb_ioctl,
     62 
     63 };
     64 
     65 CFATTACH_DECL_NEW(tegra_fb, sizeof(struct tegra_fb_softc),
     66 	tegra_fb_match, tegra_fb_attach, NULL, NULL);
     67 
     68 static int
     69 tegra_fb_match(device_t parent, cfdata_t cf, void *aux)
     70 {
     71 	return 1;
     72 }
     73 
     74 static void
     75 tegra_fb_attach(device_t parent, device_t self, void *aux)
     76 {
     77 	struct tegra_fb_softc * const sc = device_private(self);
     78 	struct tegra_drm_softc * const drmsc = device_private(parent);
     79 	struct tegra_drmfb_attach_args * const tfa = aux;
     80 	struct drmfb_attach_args da;
     81 	int error;
     82 
     83 	sc->sc_dev = self;
     84 	sc->sc_drm = drmsc;
     85 	sc->sc_tfa = *tfa;
     86 
     87 	aprint_naive("\n");
     88 	aprint_normal("\n");
     89 
     90 	da.da_dev = self;
     91 	da.da_fb_helper = tfa->tfa_fb_helper;
     92 	da.da_fb_sizes = &tfa->tfa_fb_sizes;
     93 	da.da_fb_vaddr = drmsc->sc_dmap;
     94 	da.da_params = &tegrafb_drmfb_params;
     95 
     96 	error = drmfb_attach(&sc->sc_drmfb, &da);
     97 	if (error) {
     98 		aprint_error_dev(self, "failed to attach drmfb: %d\n", error);
     99 		return;
    100 	}
    101 
    102 	pmf_device_register1(self, NULL, NULL, tegra_fb_shutdown);
    103 }
    104 
    105 static bool
    106 tegra_fb_shutdown(device_t self, int flags)
    107 {
    108 	struct tegra_fb_softc * const sc = device_private(self);
    109 
    110 	return drmfb_shutdown(&sc->sc_drmfb, flags);
    111 }
    112 
    113 static paddr_t
    114 tegra_fb_mmapfb(struct drmfb_softc *sc, off_t off, int prot)
    115 {
    116 	struct tegra_fb_softc * const tfb_sc = (struct tegra_fb_softc *)sc;
    117 
    118 	KASSERT(off >= 0);
    119 	KASSERT(off < tfb_sc->sc_drm->sc_dmasize);
    120 
    121 	return bus_dmamem_mmap(tfb_sc->sc_drm->sc_dmat,
    122 	    tfb_sc->sc_drm->sc_dmasegs, 1, off, prot, BUS_DMA_PREFETCHABLE);
    123 }
    124 
    125 static int
    126 tegra_fb_ioctl(struct drmfb_softc *sc, u_long cmd, void *data, int flag,
    127     lwp_t *l)
    128 {
    129 	struct wsdisplayio_bus_id *busid;
    130 	struct wsdisplayio_fbinfo *fbi;
    131 	struct rasops_info *ri = &sc->sc_genfb.vd.active->scr_ri;
    132 	int error;
    133 
    134 	switch (cmd) {
    135 	case WSDISPLAYIO_GET_BUSID:
    136 		busid = data;
    137 		busid->bus_type = WSDISPLAYIO_BUS_SOC;
    138 		return 0;
    139 	case WSDISPLAYIO_GTYPE:
    140 		*(u_int *)data = WSDISPLAY_TYPE_TEGRA;
    141 		return 0;
    142 	case WSDISPLAYIO_GET_FBINFO:
    143 		fbi = data;
    144 		error = wsdisplayio_get_fbinfo(ri, fbi);
    145 		fbi->fbi_flags |= WSFB_VRAM_IS_RAM;
    146 		return error;
    147 	default:
    148 		return EPASSTHROUGH;
    149 	}
    150 }
    151