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