root/arch/alpha/kernel/console.c

DEFINITIONS

1. default_vga_hose_select
2. locate_and_init_vga
3. find_console_vga_hose

   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