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

source code of linux/arch/alpha/kernel/console.c