[IA64-SGI] pcdp: add PCDP pci interface support
Mark Maule [Mon, 25 Apr 2005 20:51:00 +0000 (13:51 -0700)]
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>

arch/ia64/kernel/setup.c
drivers/firmware/pcdp.c
drivers/firmware/pcdp.h
include/asm-ia64/vga.h

index d14692e..2693e15 100644 (file)
@@ -72,6 +72,8 @@ DEFINE_PER_CPU(unsigned long, ia64_phys_stacked_size_p8);
 unsigned long ia64_cycles_per_usec;
 struct ia64_boot_param *ia64_boot_param;
 struct screen_info screen_info;
+unsigned long vga_console_iobase;
+unsigned long vga_console_membase;
 
 unsigned long ia64_max_cacheline_size;
 unsigned long ia64_iobase;     /* virtual address for I/O accesses */
@@ -273,23 +275,25 @@ io_port_init (void)
 static inline int __init
 early_console_setup (char *cmdline)
 {
+       int earlycons = 0;
+
 #ifdef CONFIG_SERIAL_SGI_L1_CONSOLE
        {
                extern int sn_serial_console_early_setup(void);
                if (!sn_serial_console_early_setup())
-                       return 0;
+                       earlycons++;
        }
 #endif
 #ifdef CONFIG_EFI_PCDP
        if (!efi_setup_pcdp_console(cmdline))
-               return 0;
+               earlycons++;
 #endif
 #ifdef CONFIG_SERIAL_8250_CONSOLE
        if (!early_serial_console_init(cmdline))
-               return 0;
+               earlycons++;
 #endif
 
-       return -1;
+       return (earlycons) ? 0 : -1;
 }
 
 static inline void
index 839b44a..53c95c0 100644 (file)
@@ -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);
                        }
                }
        }
index 1dc7c88..e72cc47 100644 (file)
@@ -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));
index 1f446d6..bc3349f 100644 (file)
  * videoram directly without any black magic.
  */
 
-#define VGA_MAP_MEM(x) ((unsigned long) ioremap((x), 0))
+extern unsigned long vga_console_iobase;
+extern unsigned long vga_console_membase;
+
+#define VGA_MAP_MEM(x) ((unsigned long) ioremap(vga_console_membase + (x), 0))
 
 #define vga_readb(x)   (*(x))
 #define vga_writeb(x,y)        (*(y) = (x))