[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>

2 files changed, 50 insertions, 7 deletions

diff --git a/drivers/firmware/pcdp.c b/drivers/firmware/pcdp.c
index 839b44a7e08b..53c95c0bbf46 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);
                         }
                 }
         }
diff --git a/drivers/firmware/pcdp.h b/drivers/firmware/pcdp.h
index 1dc7c88b7b4d..e72cc47de33b 100644
--- a/drivers/firmware/pcdp.h
+++ b/drivers/firmware/pcdp.h
@@ -52,11 +52,34 @@ struct pcdp_uart {
         u32                             clock_rate;
         u8                              pci_prog_intfc;
         u8                              flags;
-};
+} __attribute__((packed));
+
+#define PCDP_IF_PCI     1
+
+/* pcdp_if_pci.trans */
+#define PCDP_PCI_TRANS_IOPORT   0x02
+#define PCDP_PCI_TRANS_MMIO     0x01
+
+struct pcdp_if_pci {
+        u8                      interconnect;
+        u8                      reserved;
+        u16                     length;
+        u8                      segment;
+        u8                      bus;
+        u8                      dev;
+        u8                      fun;
+        u16                     dev_id;
+        u16                     vendor_id;
+        u32                     acpi_interrupt;
+        u64                     mmio_tra;
+        u64                     ioport_tra;
+        u8                      flags;
+        u8                      trans;
+} __attribute__((packed));
 
 struct pcdp_vga {
         u8                      count;          /* address space descriptors */
-};
+} __attribute__((packed));
 
 /* pcdp_device.flags */
 #define PCDP_PRIMARY_CONSOLE    1
@@ -66,7 +89,9 @@ struct pcdp_device {
         u8                      flags;
         u16                     length;
         u16                     efi_index;
-};
+        /* next data is pcdp_if_pci or pcdp_if_acpi (not yet supported) */
+        /* next data is device specific type (currently only pcdp_vga) */
+} __attribute__((packed));
 
 struct pcdp {
         u8                      signature[4];
@@ -81,4 +106,4 @@ struct pcdp {
         u32                     num_uarts;
         struct pcdp_uart        uart[0];        /* actual size is num_uarts */
         /* remainder of table is pcdp_device structures */
-};
+} __attribute__((packed));