1 /* $NetBSD: vga_pci.c,v 1.33 2007/08/26 19:52:06 martin 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@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 1.33 2007/08/26 19:52:06 martin 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 static int vga_pci_match(struct device *, struct cfdata *, void *); 75 static void vga_pci_attach(struct device *, struct device *, void *); 76 static int vga_pci_lookup_quirks(struct pci_attach_args *); 77 78 CFATTACH_DECL(vga_pci, sizeof(struct vga_pci_softc), 79 vga_pci_match, vga_pci_attach, NULL, NULL); 80 81 static int vga_pci_ioctl(void *, u_long, void *, int, struct lwp *); 82 static paddr_t vga_pci_mmap(void *, off_t, int); 83 84 static const struct vga_funcs vga_pci_funcs = { 85 vga_pci_ioctl, 86 vga_pci_mmap, 87 }; 88 89 static const struct { 90 int id; 91 int quirks; 92 } vga_pci_quirks[] = { 93 {PCI_ID_CODE(PCI_VENDOR_SILMOTION, PCI_PRODUCT_SILMOTION_SM712), 94 VGA_QUIRK_NOFASTSCROLL}, 95 }; 96 97 static const struct { 98 int vid; 99 int quirks; 100 } vga_pci_vquirks[] = { 101 {PCI_VENDOR_ATI, VGA_QUIRK_ONEFONT}, 102 }; 103 104 static int 105 vga_pci_lookup_quirks(struct pci_attach_args *pa) 106 { 107 int i; 108 109 for (i = 0; i < sizeof(vga_pci_quirks) / sizeof (vga_pci_quirks[0]); 110 i++) { 111 if (vga_pci_quirks[i].id == pa->pa_id) 112 return (vga_pci_quirks[i].quirks); 113 } 114 for (i = 0; i < sizeof(vga_pci_vquirks) / sizeof (vga_pci_vquirks[0]); 115 i++) { 116 if (vga_pci_vquirks[i].vid == PCI_VENDOR(pa->pa_id)) 117 return (vga_pci_vquirks[i].quirks); 118 } 119 return (0); 120 } 121 122 static int 123 vga_pci_match(struct device *parent, struct cfdata *match, 124 void *aux) 125 { 126 struct pci_attach_args *pa = aux; 127 int potential; 128 129 potential = 0; 130 131 /* 132 * If it's prehistoric/vga or display/vga, we might match. 133 * For the console device, this is just a sanity check. 134 */ 135 if (PCI_CLASS(pa->pa_class) == PCI_CLASS_PREHISTORIC && 136 PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_PREHISTORIC_VGA) 137 potential = 1; 138 if (PCI_CLASS(pa->pa_class) == PCI_CLASS_DISPLAY && 139 PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_DISPLAY_VGA) 140 potential = 1; 141 142 if (!potential) 143 return (0); 144 145 /* check whether it is disabled by firmware */ 146 if ((pci_conf_read(pa->pa_pc, pa->pa_tag, PCI_COMMAND_STATUS_REG) 147 & (PCI_COMMAND_IO_ENABLE | PCI_COMMAND_MEM_ENABLE)) 148 != (PCI_COMMAND_IO_ENABLE | PCI_COMMAND_MEM_ENABLE)) 149 return (0); 150 151 /* If it's the console, we have a winner! */ 152 if (vga_is_console(pa->pa_iot, WSDISPLAY_TYPE_PCIVGA)) 153 return (1); 154 155 /* 156 * If we might match, make sure that the card actually looks OK. 157 */ 158 if (!vga_common_probe(pa->pa_iot, pa->pa_memt)) 159 return (0); 160 161 return (1); 162 } 163 164 static void 165 vga_pci_attach(struct device *parent, struct device *self, void *aux) 166 { 167 struct vga_pci_softc *psc = (void *) self; 168 struct vga_softc *sc = &psc->sc_vga; 169 struct pci_attach_args *pa = aux; 170 char devinfo[256]; 171 int bar, reg; 172 173 psc->sc_pc = pa->pa_pc; 174 psc->sc_pcitag = pa->pa_tag; 175 176 pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo, sizeof(devinfo)); 177 printf(": %s (rev. 0x%02x)\n", devinfo, 178 PCI_REVISION(pa->pa_class)); 179 180 /* 181 * Gather info about all the BARs. These are used to allow 182 * the X server to map the VGA device. 183 */ 184 for (bar = 0; bar < NBARS; bar++) { 185 reg = PCI_MAPREG_START + (bar * 4); 186 if (!pci_mapreg_probe(psc->sc_pc, psc->sc_pcitag, reg, 187 &psc->sc_bars[bar].vb_type)) { 188 /* there is no valid mapping register */ 189 continue; 190 } 191 if (PCI_MAPREG_TYPE(psc->sc_bars[bar].vb_type) == 192 PCI_MAPREG_TYPE_IO) { 193 /* Don't bother fetching I/O BARs. */ 194 continue; 195 } 196 #ifndef __LP64__ 197 if (PCI_MAPREG_MEM_TYPE(psc->sc_bars[bar].vb_type) == 198 PCI_MAPREG_MEM_TYPE_64BIT) { 199 /* XXX */ 200 printf("%s: WARNING: ignoring 64-bit BAR @ 0x%02x\n", 201 sc->sc_dev.dv_xname, reg); 202 bar++; 203 continue; 204 } 205 #endif 206 if (pci_mapreg_info(psc->sc_pc, psc->sc_pcitag, reg, 207 psc->sc_bars[bar].vb_type, 208 &psc->sc_bars[bar].vb_base, 209 &psc->sc_bars[bar].vb_size, 210 &psc->sc_bars[bar].vb_flags)) 211 printf("%s: WARNING: strange BAR @ 0x%02x\n", 212 sc->sc_dev.dv_xname, reg); 213 } 214 215 /* XXX Expansion ROM? */ 216 217 vga_common_attach(sc, pa->pa_iot, pa->pa_memt, WSDISPLAY_TYPE_PCIVGA, 218 vga_pci_lookup_quirks(pa), &vga_pci_funcs); 219 220 config_found_ia(self, "drm", aux, vga_drm_print); 221 } 222 223 int 224 vga_pci_cnattach(bus_space_tag_t iot, bus_space_tag_t memt, 225 pci_chipset_tag_t pc, int bus, int device, 226 int function) 227 { 228 229 return (vga_cnattach(iot, memt, WSDISPLAY_TYPE_PCIVGA, 0)); 230 } 231 232 int 233 vga_drm_print(void *aux, const char *pnp) 234 { 235 if (pnp) 236 aprint_normal("direct rendering for %s", pnp); 237 return (UNSUPP); 238 } 239 240 241 static int 242 vga_pci_ioctl(void *v, u_long cmd, void *data, int flag, struct lwp *l) 243 { 244 struct vga_config *vc = v; 245 struct vga_pci_softc *psc = (void *) vc->softc; 246 247 switch (cmd) { 248 /* PCI config read/write passthrough. */ 249 case PCI_IOC_CFGREAD: 250 case PCI_IOC_CFGWRITE: 251 return (pci_devioctl(psc->sc_pc, psc->sc_pcitag, 252 cmd, data, flag, l)); 253 254 default: 255 return (EPASSTHROUGH); 256 } 257 } 258 259 static paddr_t 260 vga_pci_mmap(void *v, off_t offset, int prot) 261 { 262 struct vga_config *vc = v; 263 struct vga_pci_softc *psc = (void *) vc->softc; 264 struct vga_bar *vb; 265 int bar; 266 267 for (bar = 0; bar < NBARS; bar++) { 268 vb = &psc->sc_bars[bar]; 269 if (vb->vb_size == 0) 270 continue; 271 if (offset >= vb->vb_base && 272 offset < (vb->vb_base + vb->vb_size)) { 273 /* XXX This the right thing to do with flags? */ 274 return (bus_space_mmap(vc->hdl.vh_memt, vb->vb_base, 275 (offset - vb->vb_base), prot, vb->vb_flags)); 276 } 277 } 278 279 /* XXX Expansion ROM? */ 280 281 /* 282 * Allow mmap access to the legacy ISA hole. This is where 283 * the legacy video BIOS will be located, and also where 284 * the legacy VGA display buffer is located. 285 * 286 * XXX Security implications, here? 287 */ 288 if (offset >= IOM_BEGIN && offset < IOM_END) 289 return (bus_space_mmap(vc->hdl.vh_memt, IOM_BEGIN, 290 (offset - IOM_BEGIN), prot, 0)); 291 292 /* Range not found. */ 293 return (-1); 294 } 295