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vga_pci.c revision 1.16 
      1 /*	$NetBSD: vga_pci.c,v 1.16 2002/07/02 18:17:30 drochner 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 1.16 2002/07/02 18:17:30 drochner 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(struct device *, struct cfdata *, void *);
     75 void	vga_pci_attach(struct device *, struct device *, void *);
     76 static int vga_pci_lookup_quirks(struct pci_attach_args *);
     77 
     78 struct cfattach vga_pci_ca = {
     79 	sizeof(struct vga_pci_softc),
     80 	vga_pci_match,
     81 	vga_pci_attach,
     82 };
     83 
     84 int	vga_pci_ioctl(void *, u_long, caddr_t, int, struct proc *);
     85 paddr_t	vga_pci_mmap(void *, off_t, int);
     86 
     87 const struct vga_funcs vga_pci_funcs = {
     88 	vga_pci_ioctl,
     89 	vga_pci_mmap,
     90 };
     91 
     92 #if 0 /* caught by the more general rule below */
     93 static const struct {
     94 	int id;
     95 	int quirks;
     96 } vga_pci_quirks[] = {
     97 	{PCI_ID_CODE(PCI_VENDOR_ATI, PCI_PRODUCT_ATI_RAGE_XL_AGP),
     98 	 VGA_QUIRK_ONEFONT},
     99 };
    100 #endif
    101 
    102 static const struct {
    103 	int vid;
    104 	int quirks;
    105 } vga_pci_vquirks[] = {
    106 	{PCI_VENDOR_ATI, VGA_QUIRK_ONEFONT},
    107 };
    108 
    109 static int
    110 vga_pci_lookup_quirks(pa)
    111 	struct pci_attach_args *pa;
    112 {
    113 	int i;
    114 
    115 #if 0
    116 	for (i = 0; i < sizeof(vga_pci_quirks) / sizeof (vga_pci_quirks[0]);
    117 	     i++) {
    118 		if (vga_pci_quirks[i].id == pa->pa_id)
    119 			return (vga_pci_quirks[i].quirks);
    120 	}
    121 #endif
    122 	for (i = 0; i < sizeof(vga_pci_vquirks) / sizeof (vga_pci_vquirks[0]);
    123 	     i++) {
    124 		if (vga_pci_vquirks[i].vid == PCI_VENDOR(pa->pa_id))
    125 			return (vga_pci_vquirks[i].quirks);
    126 	}
    127 	return (0);
    128 }
    129 
    130 int
    131 vga_pci_match(struct device *parent, struct cfdata *match, void *aux)
    132 {
    133 	struct pci_attach_args *pa = aux;
    134 	int potential;
    135 
    136 	potential = 0;
    137 
    138 	/*
    139 	 * If it's prehistoric/vga or display/vga, we might match.
    140 	 * For the console device, this is jut a sanity check.
    141 	 */
    142 	if (PCI_CLASS(pa->pa_class) == PCI_CLASS_PREHISTORIC &&
    143 	    PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_PREHISTORIC_VGA)
    144 		potential = 1;
    145 	if (PCI_CLASS(pa->pa_class) == PCI_CLASS_DISPLAY &&
    146 	     PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_DISPLAY_VGA)
    147 		potential = 1;
    148 
    149 	if (!potential)
    150 		return (0);
    151 
    152 	/* check whether it is disabled by firmware */
    153 	if ((pci_conf_read(pa->pa_pc, pa->pa_tag, PCI_COMMAND_STATUS_REG)
    154 	    & (PCI_COMMAND_IO_ENABLE | PCI_COMMAND_MEM_ENABLE))
    155 	    != (PCI_COMMAND_IO_ENABLE | PCI_COMMAND_MEM_ENABLE))
    156 		return (0);
    157 
    158 	/* If it's the console, we have a winner! */
    159 	if (vga_is_console(pa->pa_iot, WSDISPLAY_TYPE_PCIVGA))
    160 		return (1);
    161 
    162 	/*
    163 	 * If we might match, make sure that the card actually looks OK.
    164 	 */
    165 	if (!vga_common_probe(pa->pa_iot, pa->pa_memt))
    166 		return (0);
    167 
    168 	return (1);
    169 }
    170 
    171 void
    172 vga_pci_attach(struct device *parent, struct device *self, void *aux)
    173 {
    174 	struct vga_pci_softc *psc = (void *) self;
    175 	struct vga_softc *sc = &psc->sc_vga;
    176 	struct pci_attach_args *pa = aux;
    177 	char devinfo[256];
    178 	int bar, reg;
    179 
    180 	psc->sc_pc = pa->pa_pc;
    181 	psc->sc_pcitag = pa->pa_tag;
    182 
    183 	pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo);
    184 	printf(": %s (rev. 0x%02x)\n", devinfo,
    185 	    PCI_REVISION(pa->pa_class));
    186 
    187 	/*
    188 	 * Gather info about all the BARs.  These are used to allow
    189 	 * the X server to map the VGA device.
    190 	 */
    191 	for (bar = 0; bar < NBARS; bar++) {
    192 		reg = PCI_MAPREG_START + (bar * 4);
    193 		if (!pci_mapreg_probe(psc->sc_pc, psc->sc_pcitag, reg,
    194 				      &psc->sc_bars[bar].vb_type)) {
    195 			/* there is no valid mapping register */
    196 			continue;
    197 		}
    198 		if (PCI_MAPREG_TYPE(psc->sc_bars[bar].vb_type) ==
    199 		    PCI_MAPREG_TYPE_IO) {
    200 			/* Don't bother fetching I/O BARs. */
    201 			continue;
    202 		}
    203 		if (PCI_MAPREG_MEM_TYPE(psc->sc_bars[bar].vb_type) ==
    204 		    PCI_MAPREG_MEM_TYPE_64BIT) {
    205 			/* XXX */
    206 			printf("%s: WARNING: ignoring 64-bit BAR @ 0x%02x\n",
    207 			    sc->sc_dev.dv_xname, reg);
    208 			bar++;
    209 			continue;
    210 		}
    211 		if (pci_mapreg_info(psc->sc_pc, psc->sc_pcitag, reg,
    212 		     psc->sc_bars[bar].vb_type,
    213 		     &psc->sc_bars[bar].vb_base,
    214 		     &psc->sc_bars[bar].vb_size,
    215 		     &psc->sc_bars[bar].vb_flags))
    216 			printf("%s: WARNING: strange BAR @ 0x%02x\n",
    217 			       sc->sc_dev.dv_xname, reg);
    218 	}
    219 
    220 	/* XXX Expansion ROM? */
    221 
    222 	vga_common_attach(sc, pa->pa_iot, pa->pa_memt, WSDISPLAY_TYPE_PCIVGA,
    223 			  vga_pci_lookup_quirks(pa), &vga_pci_funcs);
    224 }
    225 
    226 int
    227 vga_pci_cnattach(bus_space_tag_t iot, bus_space_tag_t memt,
    228     pci_chipset_tag_t pc, int bus, int device, int function)
    229 {
    230 
    231 	return (vga_cnattach(iot, memt, WSDISPLAY_TYPE_PCIVGA, 0));
    232 }
    233 
    234 int
    235 vga_pci_ioctl(void *v, u_long cmd, caddr_t data, int flag, struct proc *p)
    236 {
    237 	struct vga_config *vc = v;
    238 	struct vga_pci_softc *psc = (void *) vc->softc;
    239 
    240 	switch (cmd) {
    241 	/* PCI config read/write passthrough. */
    242 	case PCI_IOC_CFGREAD:
    243 	case PCI_IOC_CFGWRITE:
    244 		return (pci_devioctl(psc->sc_pc, psc->sc_pcitag,
    245 		    cmd, data, flag, p));
    246 
    247 	default:
    248 		return (EPASSTHROUGH);
    249 	}
    250 }
    251 
    252 paddr_t
    253 vga_pci_mmap(void *v, off_t offset, int prot)
    254 {
    255 	struct vga_config *vc = v;
    256 	struct vga_pci_softc *psc = (void *) vc->softc;
    257 	struct vga_bar *vb;
    258 	int bar;
    259 
    260 	for (bar = 0; bar < NBARS; bar++) {
    261 		vb = &psc->sc_bars[bar];
    262 		if (vb->vb_size == 0)
    263 			continue;
    264 		if (offset >= vb->vb_base &&
    265 		    offset < (vb->vb_base + vb->vb_size)) {
    266 			/* XXX This the right thing to do with flags? */
    267 			return (bus_space_mmap(vc->hdl.vh_memt, vb->vb_base,
    268 			    (offset - vb->vb_base), prot, vb->vb_flags));
    269 		}
    270 	}
    271 
    272 	/* XXX Expansion ROM? */
    273 
    274 	/*
    275 	 * Allow mmap access to the legacy ISA hole.  This is where
    276 	 * the legacy video BIOS will be located, and also where
    277 	 * the legacy VGA display buffer is located.
    278 	 *
    279 	 * XXX Security implications, here?
    280 	 */
    281 	if (offset >= IOM_BEGIN && offset < IOM_END)
    282 		return (bus_space_mmap(vc->hdl.vh_memt, IOM_BEGIN,
    283 		    (offset - IOM_BEGIN), prot, 0));
    284 
    285 	/* Range not found. */
    286 	return (-1);
    287 }
    288