[IA64-SGI] pcdp: add PCDP pci interface support

Resend 2 with changes per Bjorn Helgaas comments.  Changes from original:

+ Change globals to vga_console_iobase/vga_console_membase and make them
  unconditional.
+ Address style-related comments.

Patch to extend the PCDP vga setup code to support PCI io/mem translations
for the legacy vga ioport and ram spaces on architectures (e.g. altix) which
need them.

Summary of the changes:

drivers/firmware/pcdp.c
drivers/firmware/pcdp.h
-----------------------
+ add declaration for the spec-defined PCI interface struct (pcdp_if_pci)
  as well as support macros.

+ extend setup_vga_console() to know about pcdp_if_pci and add a couple of
  globals to hold the io and mem translation offsets if present.

arch/ia64/kernel/setup.c
------------------------
+ tweek early_console_setup() to allow multiple early console setup routines
  to be called.

include/asm-ia64/vga.h
----------------------
+ make VGA_MAP_MEM vga_console_membase aware

Signed-off-by: Mark Maule <maule@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 21 insertions, 3 deletions

diff --git a/drivers/firmware/pcdp.c b/drivers/firmware/pcdp.c
index 839b44a7e08..53c95c0bbf4 100644
--- a/drivers/firmware/pcdp.c
+++ b/drivers/firmware/pcdp.c
@@ -16,6 +16,7 @@
 #include <linux/console.h>
 #include <linux/efi.h>
 #include <linux/serial.h>
+#include <asm/vga.h>
 #include "pcdp.h"
 
 static int __init
@@ -40,10 +41,27 @@ setup_serial_console(struct pcdp_uart *uart)
 }
 
 static int __init
-setup_vga_console(struct pcdp_vga *vga)
+setup_vga_console(struct pcdp_device *dev)
 {
 #if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE)
-        if (efi_mem_type(0xA0000) == EFI_CONVENTIONAL_MEMORY) {
+        u8 *if_ptr;
+
+        if_ptr = ((u8 *)dev + sizeof(struct pcdp_device));
+        if (if_ptr[0] == PCDP_IF_PCI) {
+                struct pcdp_if_pci if_pci;
+
+                /* struct copy since ifptr might not be correctly aligned */
+
+                memcpy(&if_pci, if_ptr, sizeof(if_pci));
+
+                if (if_pci.trans & PCDP_PCI_TRANS_IOPORT)
+                        vga_console_iobase = if_pci.ioport_tra;
+
+                if (if_pci.trans & PCDP_PCI_TRANS_MMIO)
+                        vga_console_membase = if_pci.mmio_tra;
+        }
+
+        if (efi_mem_type(vga_console_membase + 0xA0000) == EFI_CONVENTIONAL_MEMORY) {
                 printk(KERN_ERR "PCDP: VGA selected, but frame buffer is not MMIO!\n");
                 return -ENODEV;
         }
@@ -95,7 +113,7 @@ efi_setup_pcdp_console(char *cmdline)
              dev = (struct pcdp_device *) ((u8 *) dev + dev->length)) {
                 if (dev->flags & PCDP_PRIMARY_CONSOLE) {
                         if (dev->type == PCDP_CONSOLE_VGA) {
-                                return setup_vga_console((struct pcdp_vga *) dev);
+                                return setup_vga_console(dev);
                         }
                 }
         }