95 lines
2.1 KiB
C
95 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/alpha/kernel/console.c
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*
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* Architecture-specific specific support for VGA device on
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* non-0 I/O hose
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*/
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#include <linux/pci.h>
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#include <linux/init.h>
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#include <linux/tty.h>
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#include <linux/console.h>
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#include <linux/vt.h>
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#include <asm/vga.h>
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#include <asm/machvec.h>
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#include "pci_impl.h"
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#ifdef CONFIG_VGA_HOSE
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struct pci_controller *pci_vga_hose;
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static struct resource alpha_vga = {
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.name = "alpha-vga+",
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.start = 0x3C0,
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.end = 0x3DF
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};
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static struct pci_controller * __init
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default_vga_hose_select(struct pci_controller *h1, struct pci_controller *h2)
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{
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if (h2->index < h1->index)
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return h2;
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return h1;
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}
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void __init
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locate_and_init_vga(void *(*sel_func)(void *, void *))
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{
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struct pci_controller *hose = NULL;
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struct pci_dev *dev = NULL;
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/* Default the select function */
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if (!sel_func) sel_func = (void *)default_vga_hose_select;
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/* Find the console VGA device */
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for(dev=NULL; (dev=pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, dev));) {
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if (!hose)
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hose = dev->sysdata;
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else
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hose = sel_func(hose, dev->sysdata);
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}
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/* Did we already initialize the correct one? Is there one? */
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if (!hose || (conswitchp == &vga_con && pci_vga_hose == hose))
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return;
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/* Create a new VGA ioport resource WRT the hose it is on. */
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alpha_vga.start += hose->io_space->start;
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alpha_vga.end += hose->io_space->start;
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request_resource(hose->io_space, &alpha_vga);
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/* Set the VGA hose and init the new console. */
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pci_vga_hose = hose;
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console_lock();
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do_take_over_console(&vga_con, 0, MAX_NR_CONSOLES-1, 1);
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console_unlock();
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}
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void __init
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find_console_vga_hose(void)
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{
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u64 *pu64 = (u64 *)((u64)hwrpb + hwrpb->ctbt_offset);
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if (pu64[7] == 3) { /* TERM_TYPE == graphics */
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struct pci_controller *hose;
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int h = (pu64[30] >> 24) & 0xff; /* console hose # */
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/*
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* Our hose numbering DOES match the console's, so find
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* the right one...
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*/
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for (hose = hose_head; hose; hose = hose->next) {
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if (hose->index == h) break;
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}
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if (hose) {
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printk("Console graphics on hose %d\n", h);
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pci_vga_hose = hose;
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}
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}
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}
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#endif
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