kernel/2.6.29.6-aldebaran-rt/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 <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
  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
  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
  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