1/* $NetBSD: drmfb_pci.c,v 1.5 2021/12/19 10:37:32 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 1.5 2021/12/19 10:37:32 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 <linux/pci.h> 66 67#include <drm/drm_device.h> 68#include <drm/drm_fb_helper.h> 69 70#include <drm/drmfb.h> 71#include <drm/drmfb_pci.h> 72 73/* 74 * drmfb_pci_mmap: Implementation of drmfb_params::dp_mmap. Don't use 75 * this for dp_mmapfb -- how to get at the framebuffer is device- 76 * specific. 77 */ 78paddr_t 79drmfb_pci_mmap(struct drmfb_softc *sc, off_t offset, int prot) 80{ 81 struct drm_device *const dev = sc->sc_da.da_fb_helper->dev; 82 const struct pci_attach_args *const pa = &dev->pdev->pd_pa; 83 unsigned i; 84 85 for (i = 0; PCI_BAR(i) <= PCI_MAPREG_ROM; i++) { 86 pcireg_t type; 87 bus_addr_t addr; 88 bus_size_t size; 89 int flags; 90 91 /* Interrogate the BAR. */ 92 if (!pci_mapreg_probe(pa->pa_pc, pa->pa_tag, PCI_BAR(i), 93 &type)) 94 continue; 95 if (PCI_MAPREG_TYPE(type) != PCI_MAPREG_TYPE_MEM) 96 continue; 97 if (pci_mapreg_info(pa->pa_pc, pa->pa_tag, PCI_BAR(i), type, 98 &addr, &size, &flags)) 99 continue; 100 101 /* Try to map it if it's in range. */ 102 if ((addr <= offset) && (offset < (addr + size))) 103 return bus_space_mmap(pa->pa_memt, addr, 104 (offset - addr), prot, flags); 105 106 /* Skip a slot if this was a 64-bit BAR. */ 107 if ((PCI_MAPREG_TYPE(type) == PCI_MAPREG_TYPE_MEM) && 108 (PCI_MAPREG_MEM_TYPE(type) == PCI_MAPREG_MEM_TYPE_64BIT)) 109 i += 1; 110 } 111 112 /* Failure! */ 113 return -1; 114} 115 116/* 117 * drmfb_pci_ioctl: Implementation of drmfb_params::dp_ioctl. Provides: 118 * 119 * - WSDISPLAY_GET_BUSID 120 * - WSDISPLAY_GTYPE 121 * 122 * Additionally allows access to PCI registers. 123 * 124 * XXX Do we need to provide access to PCI registers? I can't find 125 * anything that uses this functionality, and as is it is very 126 * dangerous. 127 */ 128int 129drmfb_pci_ioctl(struct drmfb_softc *sc, unsigned long cmd, void *data, 130 int flag, struct lwp *l) 131{ 132 struct drm_device *const dev = sc->sc_da.da_fb_helper->dev; 133 struct pci_attach_args *const pa = &dev->pdev->pd_pa; 134 135 switch (cmd) { 136 /* PCI config read/write passthrough. */ 137 case PCI_IOC_CFGREAD: 138 case PCI_IOC_CFGWRITE: 139 return pci_devioctl(pa->pa_pc, pa->pa_tag, cmd, data, flag, l); 140 141 /* PCI-specific wsdisplay ioctls. */ 142 case WSDISPLAYIO_GET_BUSID: 143 return wsdisplayio_busid_pci(dev->dev, pa->pa_pc, pa->pa_tag, 144 data); 145 case WSDISPLAYIO_GTYPE: 146 *(unsigned int *)data = WSDISPLAY_TYPE_PCIVGA; 147 return 0; 148 149 default: 150 return EPASSTHROUGH; 151 } 152} 153 154bool 155drmfb_pci_is_vga_console(struct drm_device *dev) 156{ 157 158#if NVGA > 0 159 return vga_is_console(dev->pdev->pd_pa.pa_iot, -1); 160#else 161 return false; 162#endif 163} 164