/* $NetBSD: vga_ofbus.c,v 1.18 2023/12/20 15:34:45 thorpej Exp $ */
/*
* Copyright (c) 1995, 1996 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Chris G. Demetriou
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or
[email protected]
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: vga_ofbus.c,v 1.18 2023/12/20 15:34:45 thorpej Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/proc.h>
#include <sys/kauth.h>
#include <dev/isa/isavar.h>
#include <dev/ic/mc6845reg.h>
#include <dev/ic/pcdisplayvar.h>
#include <dev/ic/vgareg.h>
#include <dev/ic/vgavar.h>
#include <dev/wscons/wsconsio.h>
#include <dev/wscons/wsdisplayvar.h>
#include <dev/ofw/openfirm.h>
#include <shark/ofw/vga_ofbusvar.h>
struct vga_ofbus_softc {
struct vga_softc sc_vga;
int sc_phandle;
};
#if (NIGSFB_OFBUS > 0) || (NVGA_OFBUS > 0)
extern int console_ihandle;
#endif
int vga_ofbus_match (device_t, cfdata_t, void *);
void vga_ofbus_attach (device_t, device_t, void *);
CFATTACH_DECL_NEW(vga_ofbus, sizeof(struct vga_ofbus_softc),
vga_ofbus_match, vga_ofbus_attach, NULL, NULL);
static const struct device_compatible_entry compat_data[] = {
{ .compat = "pnpPNP,900" },
DEVICE_COMPAT_EOL
};
static int vga_ofbus_ioctl(void *, u_long, void *, int, struct lwp *);
static paddr_t vga_ofbus_mmap(void *, off_t, int);
static const struct vga_funcs vga_ofbus_funcs = {
vga_ofbus_ioctl,
vga_ofbus_mmap
};
static uint32_t vga_reg[12];
extern paddr_t isa_io_physaddr, isa_mem_physaddr;
int
vga_ofbus_match(device_t parent, cfdata_t match, void *aux)
{
struct ofbus_attach_args *oba = aux;
if (!of_compatible_match(oba->oba_phandle, compat_data))
return (0);
if (!vga_is_console(&isa_io_bs_tag, WSDISPLAY_TYPE_ISAVGA) &&
!vga_common_probe(&isa_io_bs_tag, &isa_mem_bs_tag))
return (0);
return (2); /* more than generic pcdisplay */
}
void
vga_ofbus_attach(device_t parent, device_t self, void *aux)
{
struct vga_ofbus_softc *osc = device_private(self);
struct vga_softc *sc = &osc->sc_vga;
struct ofbus_attach_args *oba = aux;
int vga_handle, i;
sc->sc_dev = self;
aprint_normal("\n");
osc->sc_phandle = oba->oba_phandle;
vga_handle = OF_finddevice("/vlbus/display");
OF_getprop(vga_handle, "reg", vga_reg, sizeof(vga_reg));
/* for some idiotic reason we get this in the wrong byte order */
for (i = 0; i < 12; i++) {
vga_reg[i] = be32toh(vga_reg[i]);
aprint_debug_dev(self, "vga_reg[%2d] = 0x%08x\n",
i, vga_reg[i]);
}
vga_common_attach(sc, &isa_io_bs_tag, &isa_mem_bs_tag,
WSDISPLAY_TYPE_ISAVGA, 0, &vga_ofbus_funcs);
if (vga_reg[10] > 0) {
aprint_normal_dev(self, "aperture at 0x%08x\n", vga_reg[10]);
}
}
int
vga_ofbus_cnattach(bus_space_tag_t iot, bus_space_tag_t memt)
{
int chosen_phandle;
int stdout_ihandle, stdout_phandle, ret;
char buf[128];
stdout_phandle = 0;
/*
* Find out whether the firmware's chosen stdout is
* a display. If so, use the existing ihandle so the firmware
* doesn't become Unhappy. If not, just open it.
*/
if ((chosen_phandle = OF_finddevice("/chosen")) == -1 ||
OF_getprop(chosen_phandle, "stdout", &stdout_ihandle,
sizeof(stdout_ihandle)) != sizeof(stdout_ihandle)) {
return ENXIO;
}
stdout_ihandle = of_decode_int((unsigned char *)&stdout_ihandle);
if ((stdout_phandle = OF_instance_to_package(stdout_ihandle)) == -1 ||
OF_getprop(stdout_phandle, "device_type", buf, sizeof(buf)) <= 0) {
return ENXIO;
}
if (strcmp(buf, "display") != 0) {
/* The display is not stdout device. */
return ENXIO;
}
if (OF_call_method("text-mode3", stdout_ihandle, 0, 0) != 0) {
printf("vga_ofbus_match: text-mode3 method invocation on VGA "
"screen device failed\n");
}
ret = vga_cnattach(iot, memt, WSDISPLAY_TYPE_ISAVGA, 1);
#if (NIGSFB_OFBUS > 0) || (NVGA_OFBUS > 0)
if (ret == 0)
console_ihandle = stdout_ihandle;
#endif
return ret;
}
static int
vga_ofbus_ioctl(void *cookie, u_long cmd, void *data, int flag, struct lwp *l)
{
/* we should catch WSDISPLAYIO_SMODE here */
return 0;
}
static paddr_t
vga_ofbus_mmap(void *cookie, off_t offset, int prot)
{
/* only the superuser may mmap IO and aperture */
if (curlwp != NULL) {
if (kauth_authorize_machdep(kauth_cred_get(),
KAUTH_MACHDEP_UNMANAGEDMEM, NULL, NULL, NULL, NULL) != 0) {
return -1;
}
}
/*
* XXX
* we should really use bus_space_mmap here but for some reason
* the ISA tags contain kernel virtual addresses and translating them
* back to physical addresses doesn't really work
*/
/* access to IO ports */
if ((offset >= PCI_MAGIC_IO_RANGE) &&
(offset < (PCI_MAGIC_IO_RANGE + 0x10000))) {
paddr_t pa;
pa = isa_io_physaddr + offset - PCI_MAGIC_IO_RANGE;
return arm_btop(pa);
}
/* legacy VGA aperture */
if ((offset >= 0xa0000) && (offset < 0xc0000)) {
return arm_btop(isa_mem_physaddr + offset);
}
/* SVGA aperture, we get the address from OpenFirmware */
if (vga_reg[10] == 0)
return -1;
if ((offset >= vga_reg[10]) &&
(offset < (vga_reg[10] + vga_reg[11]))) {
return arm_btop(isa_mem_physaddr + offset);
}
return -1;
}
