LXR linux/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
  21struct pci_controller *pci_vga_hose;
  22static struct resource alpha_vga = {
  23        .name   = "alpha-vga+",
  24        .flags  = IORESOURCE_IO,
  25        .start  = 0x3C0,
  26        .end    = 0x3DF
  27};
  28
  29static struct pci_controller * __init 
  30default_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
  38void __init 
  39locate_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
  71void __init
  72find_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
  96