ALPHA: support graphics on non-zero PCI domains

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>

1 files changed, 48 insertions, 22 deletions

diff --git a/arch/alpha/kernel/console.c b/arch/alpha/kernel/console.c
index f313b34939bb..da711e37fc97 100644
--- a/arch/alpha/kernel/console.c
+++ b/arch/alpha/kernel/console.c
@@ -9,16 +9,20 @@
 #include <linux/init.h>
 #include <linux/tty.h>
 #include <linux/console.h>
+#include <linux/vt.h>
 #include <asm/vga.h>
 #include <asm/machvec.h>
 
+#include "pci_impl.h"
+
 #ifdef CONFIG_VGA_HOSE
 
-/*
- * Externally-visible vga hose bases
- */
-unsigned long __vga_hose_io_base = 0;   /* base for default hose */
-unsigned long __vga_hose_mem_base = 0;  /* base for default hose */
+struct pci_controller *pci_vga_hose;
+static struct resource alpha_vga = {
+        .name   = "alpha-vga+",
+        .start  = 0x3C0,
+        .end    = 0x3DF
+};
 
 static struct pci_controller * __init 
 default_vga_hose_select(struct pci_controller *h1, struct pci_controller *h2)
@@ -30,36 +34,58 @@ default_vga_hose_select(struct pci_controller *h1, struct pci_controller *h2)
 }
 
 void __init 
-set_vga_hose(struct pci_controller *hose)
-{
-        if (hose) {
-                __vga_hose_io_base = hose->io_space->start;
-                __vga_hose_mem_base = hose->mem_space->start;
-        }
-}
-
-void __init 
 locate_and_init_vga(void *(*sel_func)(void *, void *))
 {
         struct pci_controller *hose = NULL;
         struct pci_dev *dev = NULL;
 
+        /* Default the select function */
         if (!sel_func) sel_func = (void *)default_vga_hose_select;
 
+        /* Find the console VGA device */
         for(dev=NULL; (dev=pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, dev));) {
-                if (!hose) hose = dev->sysdata;
-                else hose = sel_func(hose, dev->sysdata);
+                if (!hose)
+                        hose = dev->sysdata;
+                else
+                        hose = sel_func(hose, dev->sysdata);
         }
 
-        /* Did we already inititialize the correct one? */
-        if (conswitchp == &vga_con &&
-            __vga_hose_io_base == hose->io_space->start &&
-            __vga_hose_mem_base == hose->mem_space->start)
+        /* Did we already initialize the correct one? Is there one? */
+        if (!hose || (conswitchp == &vga_con && pci_vga_hose == hose))
                 return;
 
-        /* Set the VGA hose and init the new console */
-        set_vga_hose(hose);
+        /* Create a new VGA ioport resource WRT the hose it is on. */
+        alpha_vga.start += hose->io_space->start;
+        alpha_vga.end += hose->io_space->start;
+        request_resource(hose->io_space, &alpha_vga);
+
+        /* Set the VGA hose and init the new console. */
+        pci_vga_hose = hose;
         take_over_console(&vga_con, 0, MAX_NR_CONSOLES-1, 1);
 }
 
+void __init
+find_console_vga_hose(void)
+{
+        u64 *pu64 = (u64 *)((u64)hwrpb + hwrpb->ctbt_offset);
+
+        if (pu64[7] == 3) {     /* TERM_TYPE == graphics */
+                struct pci_controller *hose;
+                int h = (pu64[30] >> 24) & 0xff;        /* console hose # */
+
+                /*
+                 * Our hose numbering DOES match the console's, so find
+                 * the right one...
+                 */
+                for (hose = hose_head; hose; hose = hose->next) {
+                        if (hose->index == h) break;
+                }
+
+                if (hose) {
+                        printk("Console graphics on hose %d\n", h);
+                        pci_vga_hose = hose;
+                }
+        }
+}
+
 #endif