1// SPDX-License-Identifier: GPL-2.0
2/*
3 *	linux/arch/alpha/kernel/console.c
4 *
5 * Architecture-specific specific support for VGA device on
6 * non-0 I/O hose
7 */
8
9#include <linux/pci.h>
10#include <linux/init.h>
11#include <linux/tty.h>
12#include <linux/console.h>
13#include <linux/vt.h>
14#include <asm/vga.h>
15#include <asm/machvec.h>
16
17#include "pci_impl.h"
18
19#ifdef CONFIG_VGA_HOSE
20
21struct pci_controller *pci_vga_hose;
22static struct resource alpha_vga = {
23	.name	= "alpha-vga+",
24	.flags	= IORESOURCE_IO,
25	.start	= 0x3C0,
26	.end	= 0x3DF
27};
28
29static struct pci_controller * __init
30default_vga_hose_select(struct pci_controller *h1, struct pci_controller *h2)
31{
32	if (h2->index < h1->index)
33		return h2;
34
35	return h1;
36}
37
38void __init
39locate_and_init_vga(void *(*sel_func)(void *, void *))
40{
41	struct pci_controller *hose = NULL;
42	struct pci_dev *dev = NULL;
43
44	/* Default the select function */
45	if (!sel_func) sel_func = (void *)default_vga_hose_select;
46
47	/* Find the console VGA device */
48	for(dev=NULL; (dev=pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, dev));) {
49		if (!hose)
50			hose = dev->sysdata;
51		else
52			hose = sel_func(hose, dev->sysdata);
53	}
54
55	/* Did we already initialize the correct one? Is there one? */
56	if (!hose || (conswitchp == &vga_con && pci_vga_hose == hose))
57		return;
58
59	/* Create a new VGA ioport resource WRT the hose it is on. */
60	alpha_vga.start += hose->io_space->start;
61	alpha_vga.end += hose->io_space->start;
62	request_resource(hose->io_space, &alpha_vga);
63
64	/* Set the VGA hose and init the new console. */
65	pci_vga_hose = hose;
66	console_lock();
67	do_take_over_console(&vga_con, 0, MAX_NR_CONSOLES-1, 1);
68	console_unlock();
69}
70
71void __init
72find_console_vga_hose(void)
73{
74	u64 *pu64 = (u64 *)((u64)hwrpb + hwrpb->ctbt_offset);
75
76	if (pu64[7] == 3) {	/* TERM_TYPE == graphics */
77		struct pci_controller *hose;
78		int h = (pu64[30] >> 24) & 0xff;	/* console hose # */
79
80		/*
81		 * Our hose numbering DOES match the console's, so find
82		 * the right one...
83		 */
84		for (hose = hose_head; hose; hose = hose->next) {
85			if (hose->index == h) break;
86		}
87
88		if (hose) {
89			printk("Console graphics on hose %d\n", h);
90			pci_vga_hose = hose;
91		}
92	}
93}
94
95#endif
96