1 /*
2 * linux/arch/alpha/kernel/console.c
3 *
4 * Architecture-specific specific support for VGA device on
5 * non-0 I/O hose
6 */
7
8 #include <linux/pci.h>
9 #include <linux/init.h>
10 #include <linux/tty.h>
11 #include <linux/console.h>
12 #include <linux/vt.h>
13 #include <asm/vga.h>
14 #include <asm/machvec.h>
15
16 #include "pci_impl.h"
17
18 #ifdef CONFIG_VGA_HOSE
19
20 struct pci_controller *pci_vga_hose;
21 static struct resource alpha_vga = {
22 .name = "alpha-vga+",
23 .start = 0x3C0,
24 .end = 0x3DF
25 };
26
27 static struct pci_controller * __init
default_vga_hose_select(struct pci_controller * h1,struct pci_controller * h2)28 default_vga_hose_select(struct pci_controller *h1, struct pci_controller *h2)
29 {
30 if (h2->index < h1->index)
31 return h2;
32
33 return h1;
34 }
35
36 void __init
locate_and_init_vga(void * (* sel_func)(void *,void *))37 locate_and_init_vga(void *(*sel_func)(void *, void *))
38 {
39 struct pci_controller *hose = NULL;
40 struct pci_dev *dev = NULL;
41
42 /* Default the select function */
43 if (!sel_func) sel_func = (void *)default_vga_hose_select;
44
45 /* Find the console VGA device */
46 for(dev=NULL; (dev=pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, dev));) {
47 if (!hose)
48 hose = dev->sysdata;
49 else
50 hose = sel_func(hose, dev->sysdata);
51 }
52
53 /* Did we already initialize the correct one? Is there one? */
54 if (!hose || (conswitchp == &vga_con && pci_vga_hose == hose))
55 return;
56
57 /* Create a new VGA ioport resource WRT the hose it is on. */
58 alpha_vga.start += hose->io_space->start;
59 alpha_vga.end += hose->io_space->start;
60 request_resource(hose->io_space, &alpha_vga);
61
62 /* Set the VGA hose and init the new console. */
63 pci_vga_hose = hose;
64 take_over_console(&vga_con, 0, MAX_NR_CONSOLES-1, 1);
65 }
66
67 void __init
find_console_vga_hose(void)68 find_console_vga_hose(void)
69 {
70 u64 *pu64 = (u64 *)((u64)hwrpb + hwrpb->ctbt_offset);
71
72 if (pu64[7] == 3) { /* TERM_TYPE == graphics */
73 struct pci_controller *hose;
74 int h = (pu64[30] >> 24) & 0xff; /* console hose # */
75
76 /*
77 * Our hose numbering DOES match the console's, so find
78 * the right one...
79 */
80 for (hose = hose_head; hose; hose = hose->next) {
81 if (hose->index == h) break;
82 }
83
84 if (hose) {
85 printk("Console graphics on hose %d\n", h);
86 pci_vga_hose = hose;
87 }
88 }
89 }
90
91 #endif
92