vga_pci.c revision 1.8
1 /* $NetBSD: vga_pci.c,v 1.8 2001/11/13 07:48:49 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1995, 1996 Carnegie-Mellon University. 5 * All rights reserved. 6 * 7 * Author: Chris G. Demetriou 8 * 9 * Permission to use, copy, modify and distribute this software and 10 * its documentation is hereby granted, provided that both the copyright 11 * notice and this permission notice appear in all copies of the 12 * software, derivative works or modified versions, and any portions 13 * thereof, and that both notices appear in supporting documentation. 14 * 15 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 16 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 17 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 18 * 19 * Carnegie Mellon requests users of this software to return to 20 * 21 * Software Distribution Coordinator or Software.Distribution (at) CS.CMU.EDU 22 * School of Computer Science 23 * Carnegie Mellon University 24 * Pittsburgh PA 15213-3890 25 * 26 * any improvements or extensions that they make and grant Carnegie the 27 * rights to redistribute these changes. 28 */ 29 30 #include <sys/cdefs.h> 31 __KERNEL_RCSID(0, "$NetBSD: vga_pci.c,v 1.8 2001/11/13 07:48:49 lukem Exp $"); 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/kernel.h> 36 #include <sys/device.h> 37 #include <sys/malloc.h> 38 39 #include <dev/pci/pcireg.h> 40 #include <dev/pci/pcivar.h> 41 #include <dev/pci/pcidevs.h> 42 #include <dev/pci/pciio.h> 43 44 #include <dev/ic/mc6845reg.h> 45 #include <dev/ic/pcdisplayvar.h> 46 #include <dev/ic/vgareg.h> 47 #include <dev/ic/vgavar.h> 48 #include <dev/pci/vga_pcivar.h> 49 50 #include <dev/isa/isareg.h> /* For legacy VGA address ranges */ 51 52 #include <dev/wscons/wsconsio.h> 53 #include <dev/wscons/wsdisplayvar.h> 54 55 #define NBARS 6 /* number of PCI BARs */ 56 57 struct vga_bar { 58 bus_addr_t vb_base; 59 bus_size_t vb_size; 60 pcireg_t vb_type; 61 int vb_flags; 62 }; 63 64 struct vga_pci_softc { 65 struct vga_softc sc_vga; 66 67 pci_chipset_tag_t sc_pc; 68 pcitag_t sc_pcitag; 69 70 struct vga_bar sc_bars[NBARS]; 71 struct vga_bar sc_rom; 72 }; 73 74 int vga_pci_match __P((struct device *, struct cfdata *, void *)); 75 void vga_pci_attach __P((struct device *, struct device *, void *)); 76 77 struct cfattach vga_pci_ca = { 78 sizeof(struct vga_pci_softc), vga_pci_match, vga_pci_attach, 79 }; 80 81 int vga_pci_ioctl(void *, u_long, caddr_t, int, struct proc *); 82 paddr_t vga_pci_mmap(void *, off_t, int); 83 84 const struct vga_funcs vga_pci_funcs = { 85 vga_pci_ioctl, 86 vga_pci_mmap, 87 }; 88 89 int 90 vga_pci_match(parent, match, aux) 91 struct device *parent; 92 struct cfdata *match; 93 void *aux; 94 { 95 struct pci_attach_args *pa = aux; 96 int potential; 97 98 potential = 0; 99 100 /* 101 * If it's prehistoric/vga or display/vga, we might match. 102 * For the console device, this is jut a sanity check. 103 */ 104 if (PCI_CLASS(pa->pa_class) == PCI_CLASS_PREHISTORIC && 105 PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_PREHISTORIC_VGA) 106 potential = 1; 107 if (PCI_CLASS(pa->pa_class) == PCI_CLASS_DISPLAY && 108 PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_DISPLAY_VGA) 109 potential = 1; 110 111 if (!potential) 112 return (0); 113 114 /* check whether it is disabled by firmware */ 115 if ((pci_conf_read(pa->pa_pc, pa->pa_tag, PCI_COMMAND_STATUS_REG) 116 & (PCI_COMMAND_IO_ENABLE | PCI_COMMAND_MEM_ENABLE)) 117 != (PCI_COMMAND_IO_ENABLE | PCI_COMMAND_MEM_ENABLE)) 118 return (0); 119 120 /* If it's the console, we have a winner! */ 121 if (vga_is_console(pa->pa_iot, WSDISPLAY_TYPE_PCIVGA)) 122 return (1); 123 124 /* 125 * If we might match, make sure that the card actually looks OK. 126 */ 127 if (!vga_common_probe(pa->pa_iot, pa->pa_memt)) 128 return (0); 129 130 return (1); 131 } 132 133 void 134 vga_pci_attach(parent, self, aux) 135 struct device *parent, *self; 136 void *aux; 137 { 138 struct vga_pci_softc *psc = (void *) self; 139 struct vga_softc *sc = &psc->sc_vga; 140 struct pci_attach_args *pa = aux; 141 char devinfo[256]; 142 int bar, reg; 143 144 psc->sc_pc = pa->pa_pc; 145 psc->sc_pcitag = pa->pa_tag; 146 147 pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo); 148 printf(": %s (rev. 0x%02x)\n", devinfo, 149 PCI_REVISION(pa->pa_class)); 150 151 /* 152 * Gather info about all the BARs. These are used to allow 153 * the X server to map the VGA device. 154 */ 155 for (bar = 0; bar < NBARS; bar++) { 156 reg = PCI_MAPREG_START + (bar * 4); 157 psc->sc_bars[bar].vb_type = pci_mapreg_type(psc->sc_pc, 158 psc->sc_pcitag, reg); 159 if (PCI_MAPREG_TYPE(psc->sc_bars[bar].vb_type) == 160 PCI_MAPREG_TYPE_IO) { 161 /* Don't bother fetching I/O BARs. */ 162 continue; 163 } 164 if (PCI_MAPREG_MEM_TYPE(psc->sc_bars[bar].vb_type) == 165 PCI_MAPREG_MEM_TYPE_64BIT) { 166 /* XXX */ 167 printf("%s: WARNING: ignoring 64-bit BAR @ 0x%02x\n", 168 sc->sc_dev.dv_xname, reg); 169 continue; 170 } 171 /* Ignore errors (unimplemented BARs). */ 172 (void) pci_mapreg_info(psc->sc_pc, psc->sc_pcitag, reg, 173 psc->sc_bars[bar].vb_type, 174 &psc->sc_bars[bar].vb_base, 175 &psc->sc_bars[bar].vb_size, 176 &psc->sc_bars[bar].vb_flags); 177 } 178 179 /* XXX Expansion ROM? */ 180 181 vga_common_attach(sc, pa->pa_iot, pa->pa_memt, WSDISPLAY_TYPE_PCIVGA, 182 &vga_pci_funcs); 183 } 184 185 int 186 vga_pci_cnattach(iot, memt, pc, bus, device, function) 187 bus_space_tag_t iot, memt; 188 pci_chipset_tag_t pc; 189 int bus, device, function; 190 { 191 return (vga_cnattach(iot, memt, WSDISPLAY_TYPE_PCIVGA, 0)); 192 } 193 194 int 195 vga_pci_ioctl(void *v, u_long cmd, caddr_t data, int flag, struct proc *p) 196 { 197 struct vga_config *vc = v; 198 struct vga_pci_softc *psc = (void *) vc->softc; 199 200 switch (cmd) { 201 /* PCI config read/write passthrough. */ 202 case PCI_IOC_CFGREAD: 203 case PCI_IOC_CFGWRITE: 204 return (pci_devioctl(psc->sc_pc, psc->sc_pcitag, 205 cmd, data, flag, p)); 206 207 default: 208 return (ENOTTY); 209 } 210 } 211 212 paddr_t 213 vga_pci_mmap(void *v, off_t offset, int prot) 214 { 215 struct vga_config *vc = v; 216 struct vga_pci_softc *psc = (void *) vc->softc; 217 struct vga_bar *vb; 218 int bar; 219 220 for (bar = 0; bar < NBARS; bar++) { 221 vb = &psc->sc_bars[bar]; 222 if (vb->vb_size == 0) 223 continue; 224 if (offset >= vb->vb_base && 225 offset < (vb->vb_base + vb->vb_size)) { 226 /* XXX This the right thing to do with flags? */ 227 return (bus_space_mmap(vc->hdl.vh_memt, vb->vb_base, 228 (offset - vb->vb_base), prot, vb->vb_flags)); 229 } 230 } 231 232 /* XXX Expansion ROM? */ 233 234 /* 235 * Allow mmap access to the legacy ISA hole. This is where 236 * the legacy video BIOS will be located, and also where 237 * the legacy VGA display buffer is located. 238 * 239 * XXX Security implications, here? 240 */ 241 if (offset >= IOM_BEGIN && offset < IOM_END) 242 return (bus_space_mmap(vc->hdl.vh_memt, IOM_BEGIN, 243 (offset - IOM_BEGIN), prot, 0)); 244 245 /* Range not found. */ 246 return (-1); 247 } 248
Indexes created Mon Sep 22 21:09:42 GMT 2025