/* $NetBSD: pci_milan.c,v 1.17 2023/01/06 10:28:28 tsutsui Exp $ */
/*-
* Copyright (c) 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Leo Weppelman.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pci_milan.c,v 1.17 2023/01/06 10:28:28 tsutsui Exp $");
#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dev/isa/isavar.h> /* isa_intr_{dis}establish */
#include <dev/isa/isareg.h> /* isa_intr_{dis}establish */
#include <sys/bswap.h>
#include <machine/isa_machdep.h> /* isa_intr_{dis}establish */
#include <atari/pci/pci_vga.h>
#include <atari/dev/grf_etreg.h>
int
pci_bus_maxdevs(pci_chipset_tag_t pc, int busno)
{
return 6;
}
/*
* These are defined in locore.s:
*/
pcireg_t milan_pci_confread(pcitag_t);
void milan_pci_confwrite(uint32_t, pcireg_t);
extern uint32_t plx_status;
pcireg_t
pci_conf_read(pci_chipset_tag_t pc, pcitag_t tag, int reg)
{
uint32_t data;
if ((uint32_t)reg >= PCI_CONF_SIZE)
return 0xffffffff;
data = bswap32(milan_pci_confread(tag | reg));
if ((plx_status & 0xf9000000) != 0) {
/*
* Access error, assume nothing there...
*/
data = 0xffffffff;
}
return data;
}
void
pci_conf_write(pci_chipset_tag_t pc, pcitag_t tag, int reg, pcireg_t data)
{
if ((uint32_t)reg >= PCI_CONF_SIZE)
return;
milan_pci_confwrite(tag | reg, bswap32(data));
}
int
pci_intr_setattr(pci_chipset_tag_t pc, pci_intr_handle_t *ih, int attr,
uint64_t data)
{
switch (attr) {
case PCI_INTR_MPSAFE:
return 0;
default:
return ENODEV;
}
}
void *
pci_intr_establish(pci_chipset_tag_t pc, pci_intr_handle_t ih, int level,
int (*ih_fun)(void *), void *ih_arg)
{
if (ih == 0 || ih >= 16 || ih == 2)
panic("pci_intr_establish: bogus handle 0x%x", ih);
return isa_intr_establish(NULL, ih, IST_LEVEL, level, ih_fun, ih_arg);
}
void
pci_intr_disestablish(pci_chipset_tag_t pc, void *cookie)
{
isa_intr_disestablish(NULL, cookie);
}
/*
* VGA related stuff...
*
* It looks like the Milan BIOS is initializing the VGA card in a reasonably
* standard text mode. However, the screen mode is 640*480 instead of 640*400.
* Since wscons does not handle the right by default, the card is reprogrammed
* to 640*400 using only 'standard' VGA registers (I hope!). So this ought to
* work on cards other than the S3Trio card I have tested it on.
*/
static const uint8_t crt_tab[] = {
/* taken from vga_crtc[] in sys/dev/ic/vga_subr.c */
0x5f, /* 00: horizontal total */
0x4f, /* 01: horizontal display-enable end */
0x50, /* 02: start horizontal blanking */
0x82, /* 03: display skew control / end horizontal blanking */
0x55, /* 04: start horizontal retrace pulse */
0x81, /* 05: horizontal retrace delay / end horizontal retrace */
0xbf, /* 06: vertical total */
0x1f, /* 07: overflow register */
0x00, /* 08: preset row scan */
0x4f, /* 09: overflow / maximum scan line */
0x0d, /* 0A: cursor off / cursor start */
0x0e, /* 0B: cursor skew / cursor end */
0x00, /* 0C: start regenerative buffer address high */
0x00, /* 0D: start regenerative buffer address low */
0x00, /* 0E: cursor location high */
0x00, /* 0F: cursor location low */
0x9c, /* 10: vertical retrace start */
0x8e, /* 11: vertical interrupt / vertical retrace end */
0x8f, /* 12: vertical display enable end */
0x28, /* 13: logical line width */
0x00, /* 14: underline location */
0x96, /* 15: start vertical blanking */
0xb9, /* 16: end vertical blanking */
0xa3, /* 17: CRT mode control */
0xff /* 18: line compare */
};
/*
* XXX: Why are we repeating this everywhere! (Leo)
*/
#define PCI_LINMEMBASE 0x0e000000
void
milan_vga_init(pci_chipset_tag_t pc, pcitag_t tag, int id,
volatile uint8_t *ba, uint8_t *fb)
{
uint32_t csr;
int i;
/* Turn on the card */
pci_conf_write(pc, tag, PCI_MAPREG_START, PCI_LINMEMBASE);
csr = pci_conf_read(pc, tag, PCI_COMMAND_STATUS_REG);
csr |= (PCI_COMMAND_MEM_ENABLE|PCI_COMMAND_IO_ENABLE);
csr |= PCI_COMMAND_MASTER_ENABLE;
pci_conf_write(pc, tag, PCI_COMMAND_STATUS_REG, csr);
/*
* Make sure we're allowed to write all crt-registers and reload them.
*/
WCrt(ba, CRT_ID_END_VER_RETR, (RCrt(ba, CRT_ID_END_VER_RETR) & 0x7f));
for (i = 0; i < 0x18; i++)
WCrt(ba, i, crt_tab[i]);
/*
* The Milan has a white border... make it black
*/
WAttr(ba, 0x11, 0|0x20);
}
