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