arch/alpha/kernel/console.c

   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 <asm/vga.h>
  13 #include <asm/machvec.h>
  14
  15 #ifdef CONFIG_VGA_HOSE
  16
  17 /*
  18  * Externally-visible vga hose bases
  19  */
  20 unsigned long __vga_hose_io_base = 0;   /* base for default hose */
  21 unsigned long __vga_hose_mem_base = 0;  /* base for default hose */
  22
  23 static struct pci_controller * __init
  24 default_vga_hose_select(struct pci_controller *h1, struct pci_controller *h2)
  25 {
  26         if (h2->index < h1->index)
  27                 return h2;
  28
  29         return h1;
  30 }
  31
  32 void __init
  33 set_vga_hose(struct pci_controller *hose)
  34 {
  35         if (hose) {
  36                 __vga_hose_io_base = hose->io_space->start;
  37                 __vga_hose_mem_base = hose->mem_space->start;
  38         }
  39 }
  40
  41 void __init
  42 locate_and_init_vga(void *(*sel_func)(void *, void *))
  43 {
  44         struct pci_controller *hose = NULL;
  45         struct pci_dev *dev = NULL;
  46
  47         if (!sel_func) sel_func = (void *)default_vga_hose_select;
  48
  49         for(dev=NULL; (dev=pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, dev));) {
  50                 if (!hose) hose = dev->sysdata;
  51                 else hose = sel_func(hose, dev->sysdata);
  52         }
  53
  54         /* Did we already inititialize the correct one? */
  55         if (conswitchp == &vga_con &&
  56             __vga_hose_io_base == hose->io_space->start &&
  57             __vga_hose_mem_base == hose->mem_space->start)
  58                 return;
  59
  60         /* Set the VGA hose and init the new console */
  61         set_vga_hose(hose);
  62         take_over_console(&vga_con, 0, MAX_NR_CONSOLES-1, 1);
  63 }
  64
  65 #endif