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
default_vga_hose_select(struct pci_controller * h1,struct pci_controller * h2)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
locate_and_init_vga(void * (* sel_func)(void *,void *))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
find_console_vga_hose(void)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