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, 1 insertions, 6 deletions

diff --git a/include/asm-alpha/core_titan.h b/include/asm-alpha/core_titan.h
index a64ccbff7d98..a17f6f33b68e 100644
--- a/include/asm-alpha/core_titan.h
+++ b/include/asm-alpha/core_titan.h
@@ -380,12 +380,7 @@ struct el_PRIVATEER_envdata_mcheck {
 /*
  * Memory functions.  all accesses are done through linear space.
  */
-
-__EXTERN_INLINE void __iomem *titan_ioportmap(unsigned long addr)
-{
-	return (void __iomem *)(addr + TITAN_IO_BIAS);
-}
-
+extern void __iomem *titan_ioportmap(unsigned long addr);
 extern void __iomem *titan_ioremap(unsigned long addr, unsigned long size);
 extern void titan_iounmap(volatile void __iomem *addr);