console.c

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