arch/alpha/kernel/console.c

   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         .start  = 0x3C0,
  25         .end    = 0x3DF
  26 };
  27
  28 static struct pci_controller * __init
  29 default_vga_hose_select(struct pci_controller *h1, struct pci_controller *h2)
  30 {
  31         if (h2->index < h1->index)
  32                 return h2;
  33
  34         return h1;
  35 }
  36
  37 void __init
  38 locate_and_init_vga(void *(*sel_func)(void *, void *))
  39 {
  40         struct pci_controller *hose = NULL;
  41         struct pci_dev *dev = NULL;
  42
  43         /* Default the select function */
  44         if (!sel_func) sel_func = (void *)default_vga_hose_select;
  45
  46         /* Find the console VGA device */
  47         for(dev=NULL; (dev=pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, dev));) {
  48                 if (!hose)
  49                         hose = dev->sysdata;
  50                 else
  51                         hose = sel_func(hose, dev->sysdata);
  52         }
  53
  54         /* Did we already initialize the correct one? Is there one? */
  55         if (!hose || (conswitchp == &vga_con && pci_vga_hose == hose))
  56                 return;
  57
  58         /* Create a new VGA ioport resource WRT the hose it is on. */
  59         alpha_vga.start += hose->io_space->start;
  60         alpha_vga.end += hose->io_space->start;
  61         request_resource(hose->io_space, &alpha_vga);
  62
  63         /* Set the VGA hose and init the new console. */
  64         pci_vga_hose = hose;
  65         console_lock();
  66         do_take_over_console(&vga_con, 0, MAX_NR_CONSOLES-1, 1);
  67         console_unlock();
  68 }
  69
  70 void __init
  71 find_console_vga_hose(void)
  72 {
  73         u64 *pu64 = (u64 *)((u64)hwrpb + hwrpb->ctbt_offset);
  74
  75         if (pu64[7] == 3) {     /* TERM_TYPE == graphics */
  76                 struct pci_controller *hose;
  77                 int h = (pu64[30] >> 24) & 0xff;        /* console hose # */
  78
  79                 /*
  80                  * Our hose numbering DOES match the console's, so find
  81                  * the right one...
  82                  */
  83                 for (hose = hose_head; hose; hose = hose->next) {
  84                         if (hose->index == h) break;
  85                 }
  86
  87                 if (hose) {
  88                         printk("Console graphics on hose %d\n", h);
  89                         pci_vga_hose = hose;
  90                 }
  91         }
  92 }
  93
  94 #endif