025a22151c
This code replaces earlier and incomplete handling of graphics on non-zero PCI domains (aka hoses or peer PCI buses). An option (CONFIG_VGA_HOSE) is set TRUE if configuring a GENERIC kernel, or a kernel for MARVEL, TITAN, or TSUNAMI machines, as these are the machines whose SRM consoles are capable of configuring and handling graphics options on non-zero hoses. All other machines have the option set FALSE. A routine, "find_console_vga_hose()", is used to find the graphics device which the machine's firmware believes is the console device, and it sets a global (pci_vga_hose) for later use in managing access to the device. This is called in "init_arch" on TITAN and TSUNAMI machines; MARVEL machines use a custom version of this routine because of extra complexity. A routine, "locate_and_init_vga()", is used to find the graphics device and set a global (pci_vga_hose) for later use in managing access to the device, in the case where "find_console_vga_hose" has failed. Various adjustments are made to the ioremap and ioportmap routines for detecting and translating "legacy" VGA register and memory references to the real PCI domain. [akpm@linux-foundation.org: don't statically init bss] [akpm@linux-foundation.org: build fix] Signed-off-by: Jay Estabrook <jay.estabrook@hp.com> Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Richard Henderson <rth@twiddle.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
91 lines
2 KiB
C
91 lines
2 KiB
C
/*
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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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take_over_console(&vga_con, 0, MAX_NR_CONSOLES-1, 1);
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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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