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drmfb_pci.c revision 1.4 
      1 /*	$NetBSD: drmfb_pci.c,v 1.4 2021/12/19 10:33:00 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2014 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Taylor R. Campbell.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * drmfb_pci: drmfb hooks for PCI devices.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 __KERNEL_RCSID(0, "$NetBSD: drmfb_pci.c,v 1.4 2021/12/19 10:33:00 riastradh Exp $");
     38 
     39 #ifdef _KERNEL_OPT
     40 #include "vga.h"
     41 #endif
     42 
     43 #include <sys/types.h>
     44 #include <sys/device.h>
     45 #include <sys/errno.h>
     46 #include <sys/systm.h>
     47 
     48 #include <dev/pci/pciio.h>
     49 #include <dev/pci/pcireg.h>
     50 #include <dev/pci/pcivar.h>
     51 #include <dev/pci/wsdisplay_pci.h>
     52 
     53 #if NVGA > 0
     54 /*
     55  * XXX All we really need is vga_is_console from vgavar.h, but the
     56  * header files are missing their own dependencies, so we need to
     57  * explicitly drag in the other crap.
     58  */
     59 #include <dev/ic/mc6845reg.h>
     60 #include <dev/ic/pcdisplayvar.h>
     61 #include <dev/ic/vgareg.h>
     62 #include <dev/ic/vgavar.h>
     63 #endif
     64 
     65 #include <drm/drm_device.h>
     66 #include <drm/drm_fb_helper.h>
     67 
     68 #include <drm/drmfb.h>
     69 #include <drm/drmfb_pci.h>
     70 
     71 /*
     72  * drmfb_pci_mmap: Implementation of drmfb_params::dp_mmap.  Don't use
     73  * this for dp_mmapfb -- how to get at the framebuffer is device-
     74  * specific.
     75  */
     76 paddr_t
     77 drmfb_pci_mmap(struct drmfb_softc *sc, off_t offset, int prot)
     78 {
     79 	struct drm_device *const dev = sc->sc_da.da_fb_helper->dev;
     80 	const struct pci_attach_args *const pa = &dev->pdev->pd_pa;
     81 	unsigned i;
     82 
     83 	for (i = 0; PCI_BAR(i) <= PCI_MAPREG_ROM; i++) {
     84 		pcireg_t type;
     85 		bus_addr_t addr;
     86 		bus_size_t size;
     87 		int flags;
     88 
     89 		/* Interrogate the BAR.  */
     90 		if (!pci_mapreg_probe(pa->pa_pc, pa->pa_tag, PCI_BAR(i),
     91 			&type))
     92 			continue;
     93 		if (PCI_MAPREG_TYPE(type) != PCI_MAPREG_TYPE_MEM)
     94 			continue;
     95 		if (pci_mapreg_info(pa->pa_pc, pa->pa_tag, PCI_BAR(i), type,
     96 			&addr, &size, &flags))
     97 			continue;
     98 
     99 		/* Try to map it if it's in range.  */
    100 		if ((addr <= offset) && (offset < (addr + size)))
    101 			return bus_space_mmap(pa->pa_memt, addr,
    102 			    (offset - addr), prot, flags);
    103 
    104 		/* Skip a slot if this was a 64-bit BAR.  */
    105 		if ((PCI_MAPREG_TYPE(type) == PCI_MAPREG_TYPE_MEM) &&
    106 		    (PCI_MAPREG_MEM_TYPE(type) == PCI_MAPREG_MEM_TYPE_64BIT))
    107 			i += 1;
    108 	}
    109 
    110 	/* Failure!  */
    111 	return -1;
    112 }
    113 
    114 /*
    115  * drmfb_pci_ioctl: Implementation of drmfb_params::dp_ioctl.  Provides:
    116  *
    117  * - WSDISPLAY_GET_BUSID
    118  * - WSDISPLAY_GTYPE
    119  *
    120  * Additionally allows access to PCI registers.
    121  *
    122  * XXX Do we need to provide access to PCI registers?  I can't find
    123  * anything that uses this functionality, and as is it is very
    124  * dangerous.
    125  */
    126 int
    127 drmfb_pci_ioctl(struct drmfb_softc *sc, unsigned long cmd, void *data,
    128     int flag, struct lwp *l)
    129 {
    130 	struct drm_device *const dev = sc->sc_da.da_fb_helper->dev;
    131 	struct pci_attach_args *const pa = &dev->pdev->pd_pa;
    132 
    133 	switch (cmd) {
    134 	/* PCI config read/write passthrough.  */
    135 	case PCI_IOC_CFGREAD:
    136 	case PCI_IOC_CFGWRITE:
    137 		return pci_devioctl(pa->pa_pc, pa->pa_tag, cmd, data, flag, l);
    138 
    139 	/* PCI-specific wsdisplay ioctls.  */
    140 	case WSDISPLAYIO_GET_BUSID:
    141 		return wsdisplayio_busid_pci(dev->dev, pa->pa_pc, pa->pa_tag,
    142 		    data);
    143 	case WSDISPLAYIO_GTYPE:
    144 		*(unsigned int *)data = WSDISPLAY_TYPE_PCIVGA;
    145 		return 0;
    146 
    147 	default:
    148 		return EPASSTHROUGH;
    149 	}
    150 }
    151 
    152 bool
    153 drmfb_pci_is_vga_console(struct drm_device *dev)
    154 {
    155 
    156 #if NVGA > 0
    157 	return vga_is_console(dev->pdev->pd_pa.pa_iot, -1);
    158 #else
    159 	return false;
    160 #endif
    161 }
    162