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
22 struct pci_controller *pci_vga_hose;
23 static struct resource alpha_vga = {
24 .name = "alpha-vga+",
25 .flags = IORESOURCE_IO,
26 .start = 0x3C0,
27 .end = 0x3DF
28 };
29
30 static struct pci_controller * __init
31 default_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
39 void __init
40 locate_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
72 void __init
73 find_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
97
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