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>

9 files changed, 155 insertions, 94 deletions

diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index 770f717bd250..905e86408aaa 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -481,6 +481,15 @@ config ALPHA_BROKEN_IRQ_MASK
         depends on ALPHA_GENERIC || ALPHA_PC164
         default y
 
+config VGA_HOSE
+        bool
+        depends on ALPHA_GENERIC || ALPHA_TITAN || ALPHA_MARVEL || ALPHA_TSUNAMI
+        default y
+        help
+          Support VGA on an arbitrary hose; needed for several platforms
+          which always have multiple hoses, and whose consoles support it.
+
+
 config ALPHA_SRM
         bool "Use SRM as bootloader" if ALPHA_CABRIOLET || ALPHA_AVANTI_CH || ALPHA_EB64P || ALPHA_PC164 || ALPHA_TAKARA || ALPHA_EB164 || ALPHA_ALCOR || ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_NAUTILUS || ALPHA_NONAME
         default y if ALPHA_JENSEN || ALPHA_MIKASA || ALPHA_SABLE || ALPHA_LYNX || ALPHA_NORITAKE || ALPHA_DP264 || ALPHA_RAWHIDE || ALPHA_EIGER || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_SHARK || ALPHA_MARVEL
@@ -644,6 +653,13 @@ source "arch/alpha/oprofile/Kconfig"
 
 source "arch/alpha/Kconfig.debug"
 
+# DUMMY_CONSOLE may be defined in drivers/video/console/Kconfig
+# but we also need it if VGA_HOSE is set
+config DUMMY_CONSOLE
+        bool
+        depends on VGA_HOSE
+        default y
+
 source "security/Kconfig"
 
 source "crypto/Kconfig"
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
diff --git a/arch/alpha/kernel/core_marvel.c b/arch/alpha/kernel/core_marvel.c
index 7f6a98455e74..f10d2eddd2c3 100644
--- a/arch/alpha/kernel/core_marvel.c
+++ b/arch/alpha/kernel/core_marvel.c
@@ -25,6 +25,7 @@
 #include <asm/pgalloc.h>
 #include <asm/tlbflush.h>
 #include <asm/rtc.h>
+#include <asm/vga.h>
 
 #include "proto.h"
 #include "pci_impl.h"
@@ -367,9 +368,8 @@ marvel_io7_present(gct6_node *node)
 }
 
 static void __init
-marvel_init_vga_hose(void)
+marvel_find_console_vga_hose(void)
 {
-#ifdef CONFIG_VGA_HOSE
         u64 *pu64 = (u64 *)((u64)hwrpb + hwrpb->ctbt_offset);
 
         if (pu64[7] == 3) {     /* TERM_TYPE == graphics */
@@ -403,7 +403,6 @@ marvel_init_vga_hose(void)
                         pci_vga_hose = hose;
                 }
         }
-#endif /* CONFIG_VGA_HOSE */
 }
 
 gct6_search_struct gct_wanted_node_list[] = {
@@ -459,7 +458,7 @@ marvel_init_arch(void)
                 marvel_init_io7(io7);
 
         /* Check for graphic console location (if any).  */
-        marvel_init_vga_hose();
+        marvel_find_console_vga_hose();
 }
 
 void
@@ -684,9 +683,6 @@ __marvel_rtc_io(u8 b, unsigned long addr, int write)
 /*
  * IO map support.
  */
-
-#define __marvel_is_mem_vga(a)  (((a) >= 0xa0000) && ((a) <= 0xc0000))
-
 void __iomem *
 marvel_ioremap(unsigned long addr, unsigned long size)
 {
@@ -698,13 +694,9 @@ marvel_ioremap(unsigned long addr, unsigned long size)
         unsigned long pfn;
 
         /*
-         * Adjust the addr.
+         * Adjust the address.
          */ 
-#ifdef CONFIG_VGA_HOSE
-        if (pci_vga_hose && __marvel_is_mem_vga(addr)) {
-                addr += pci_vga_hose->mem_space->start;
-        }
-#endif
+        FIXUP_MEMADDR_VGA(addr);
 
         /*
          * Find the hose.
@@ -781,7 +773,9 @@ marvel_ioremap(unsigned long addr, unsigned long size)
                 return (void __iomem *) vaddr;
         }
 
-        return NULL;
+        /* Assume it was already a reasonable address */
+        vaddr = baddr + hose->mem_space->start;
+        return (void __iomem *) vaddr;
 }
 
 void
@@ -803,21 +797,12 @@ marvel_is_mmio(const volatile void __iomem *xaddr)
                 return (addr & 0xFF000000UL) == 0;
 }
 
-#define __marvel_is_port_vga(a) \
-  (((a) >= 0x3b0) && ((a) < 0x3e0) && ((a) != 0x3b3) && ((a) != 0x3d3))
 #define __marvel_is_port_kbd(a) (((a) == 0x60) || ((a) == 0x64))
 #define __marvel_is_port_rtc(a) (((a) == 0x70) || ((a) == 0x71))
 
 void __iomem *marvel_ioportmap (unsigned long addr)
 {
-        if (__marvel_is_port_rtc (addr) || __marvel_is_port_kbd(addr))
-                ;
-#ifdef CONFIG_VGA_HOSE
-        else if (__marvel_is_port_vga (addr) && pci_vga_hose)
-                addr += pci_vga_hose->io_space->start;
-#endif
-        else
-                return NULL;
+        FIXUP_IOADDR_VGA(addr);
         return (void __iomem *)addr;
 }
 
@@ -829,8 +814,14 @@ marvel_ioread8(void __iomem *xaddr)
                 return 0;
         else if (__marvel_is_port_rtc(addr))
                 return __marvel_rtc_io(0, addr, 0);
-        else
+        else if (marvel_is_ioaddr(addr))
                 return __kernel_ldbu(*(vucp)addr);
+        else
+                /* this should catch other legacy addresses
+                   that would normally fail on MARVEL,
+                   because there really is nothing there...
+                */
+                return ~0;
 }
 
 void
@@ -841,7 +832,7 @@ marvel_iowrite8(u8 b, void __iomem *xaddr)
                 return;
         else if (__marvel_is_port_rtc(addr)) 
                 __marvel_rtc_io(b, addr, 1);
-        else
+        else if (marvel_is_ioaddr(addr))
                 __kernel_stb(b, *(vucp)addr);
 }
 
diff --git a/arch/alpha/kernel/core_titan.c b/arch/alpha/kernel/core_titan.c
index 3662fef7db9a..819326627b96 100644
--- a/arch/alpha/kernel/core_titan.c
+++ b/arch/alpha/kernel/core_titan.c
@@ -21,6 +21,7 @@
 #include <asm/smp.h>
 #include <asm/pgalloc.h>
 #include <asm/tlbflush.h>
+#include <asm/vga.h>
 
 #include "proto.h"
 #include "pci_impl.h"
@@ -35,6 +36,11 @@ struct
 } saved_config[4] __attribute__((common));
 
 /*
+ * Is PChip 1 present? No need to query it more than once.
+ */
+static int titan_pchip1_present;
+
+/*
  * BIOS32-style PCI interface:
  */
 
@@ -344,43 +350,17 @@ titan_init_one_pachip_port(titan_pachip_port *port, int index)
 static void __init
 titan_init_pachips(titan_pachip *pachip0, titan_pachip *pachip1)
 {
-        int pchip1_present = TITAN_cchip->csc.csr & 1L<<14;
+        titan_pchip1_present = TITAN_cchip->csc.csr & 1L<<14;
 
         /* Init the ports in hose order... */
         titan_init_one_pachip_port(&pachip0->g_port, 0);        /* hose 0 */
-        if (pchip1_present)
+        if (titan_pchip1_present)
                 titan_init_one_pachip_port(&pachip1->g_port, 1);/* hose 1 */
         titan_init_one_pachip_port(&pachip0->a_port, 2);        /* hose 2 */
-        if (pchip1_present)
+        if (titan_pchip1_present)
                 titan_init_one_pachip_port(&pachip1->a_port, 3);/* hose 3 */
 }
 
-static void __init
-titan_init_vga_hose(void)
-{
-#ifdef CONFIG_VGA_HOSE
-        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 matches the console's, so just 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", hose->index);
-                        pci_vga_hose = hose;
-                }
-        }
-#endif /* CONFIG_VGA_HOSE */
-}
-
 void __init
 titan_init_arch(void)
 {
@@ -406,6 +386,7 @@ titan_init_arch(void)
 
         /* With multiple PCI busses, we play with I/O as physical addrs.  */
         ioport_resource.end = ~0UL;
+        iomem_resource.end = ~0UL;
 
         /* PCI DMA Direct Mapping is 1GB at 2GB.  */
         __direct_map_base = 0x80000000;
@@ -415,7 +396,7 @@ titan_init_arch(void)
         titan_init_pachips(TITAN_pachip0, TITAN_pachip1);
 
         /* Check for graphic console location (if any).  */
-        titan_init_vga_hose();
+        find_console_vga_hose();
 }
 
 static void
@@ -441,9 +422,7 @@ titan_kill_one_pachip_port(titan_pachip_port *port, int index)
 static void
 titan_kill_pachips(titan_pachip *pachip0, titan_pachip *pachip1)
 {
-        int pchip1_present = TITAN_cchip->csc.csr & 1L<<14;
-
-        if (pchip1_present) {
+        if (titan_pchip1_present) {
                 titan_kill_one_pachip_port(&pachip1->g_port, 1);
                 titan_kill_one_pachip_port(&pachip1->a_port, 3);
         }
@@ -463,6 +442,14 @@ titan_kill_arch(int mode)
  */
 
 void __iomem *
+titan_ioportmap(unsigned long addr)
+{
+        FIXUP_IOADDR_VGA(addr);
+        return (void __iomem *)(addr + TITAN_IO_BIAS);
+}
+
+
+void __iomem *
 titan_ioremap(unsigned long addr, unsigned long size)
 {
         int h = (addr & TITAN_HOSE_MASK) >> TITAN_HOSE_SHIFT;
@@ -475,14 +462,12 @@ titan_ioremap(unsigned long addr, unsigned long size)
         unsigned long pfn;
 
         /*
-         * Adjust the addr.
+         * Adjust the address and hose, if necessary.
          */ 
-#ifdef CONFIG_VGA_HOSE
-        if (pci_vga_hose && __titan_is_mem_vga(addr)) {
+        if (pci_vga_hose && __is_mem_vga(addr)) {
                 h = pci_vga_hose->index;
                 addr += pci_vga_hose->mem_space->start;
         }
-#endif
 
         /*
          * Find the hose.
@@ -521,8 +506,10 @@ titan_ioremap(unsigned long addr, unsigned long size)
                  * Map it
                  */
                 area = get_vm_area(size, VM_IOREMAP);
-                if (!area)
+                if (!area) {
+                        printk("ioremap failed... no vm_area...\n");
                         return NULL;
+                }
 
                 ptes = hose->sg_pci->ptes;
                 for (vaddr = (unsigned long)area->addr; 
@@ -539,7 +526,7 @@ titan_ioremap(unsigned long addr, unsigned long size)
                         if (__alpha_remap_area_pages(vaddr,
                                                      pfn << PAGE_SHIFT, 
                                                      PAGE_SIZE, 0)) {
-                                printk("FAILED to map...\n");
+                                printk("FAILED to remap_area_pages...\n");
                                 vfree(area->addr);
                                 return NULL;
                         }
@@ -551,7 +538,8 @@ titan_ioremap(unsigned long addr, unsigned long size)
                 return (void __iomem *) vaddr;
         }
 
-        return NULL;
+        /* Assume a legacy (read: VGA) address, and return appropriately. */
+        return (void __iomem *)(addr + TITAN_MEM_BIAS);
 }
 
 void
@@ -574,6 +562,7 @@ titan_is_mmio(const volatile void __iomem *xaddr)
 }
 
 #ifndef CONFIG_ALPHA_GENERIC
+EXPORT_SYMBOL(titan_ioportmap);
 EXPORT_SYMBOL(titan_ioremap);
 EXPORT_SYMBOL(titan_iounmap);
 EXPORT_SYMBOL(titan_is_mmio);
@@ -750,6 +739,7 @@ titan_agp_info(void)
         if (titan_query_agp(port))
                 hosenum = 2;
         if (hosenum < 0 && 
+            titan_pchip1_present &&
             titan_query_agp(port = &TITAN_pachip1->a_port)) 
                 hosenum = 3;
         
diff --git a/arch/alpha/kernel/core_tsunami.c b/arch/alpha/kernel/core_tsunami.c
index ce623c6e55e1..ef91e09590d4 100644
--- a/arch/alpha/kernel/core_tsunami.c
+++ b/arch/alpha/kernel/core_tsunami.c
@@ -19,6 +19,7 @@
 
 #include <asm/ptrace.h>
 #include <asm/smp.h>
+#include <asm/vga.h>
 
 #include "proto.h"
 #include "pci_impl.h"
@@ -349,6 +350,26 @@ tsunami_init_one_pchip(tsunami_pchip *pchip, int index)
         tsunami_pci_tbi(hose, 0, -1);
 }
 
+
+void __iomem *
+tsunami_ioportmap(unsigned long addr)
+{
+        FIXUP_IOADDR_VGA(addr);
+        return (void __iomem *)(addr + TSUNAMI_IO_BIAS);
+}
+
+void __iomem *
+tsunami_ioremap(unsigned long addr, unsigned long size)
+{
+        FIXUP_MEMADDR_VGA(addr);
+        return (void __iomem *)(addr + TSUNAMI_MEM_BIAS);
+}
+
+#ifndef CONFIG_ALPHA_GENERIC
+EXPORT_SYMBOL(tsunami_ioportmap);
+EXPORT_SYMBOL(tsunami_ioremap);
+#endif
+
 void __init
 tsunami_init_arch(void)
 {
@@ -393,6 +414,9 @@ tsunami_init_arch(void)
         tsunami_init_one_pchip(TSUNAMI_pchip0, 0);
         if (TSUNAMI_cchip->csc.csr & 1L<<14)
                 tsunami_init_one_pchip(TSUNAMI_pchip1, 1);
+
+        /* Check for graphic console location (if any).  */
+        find_console_vga_hose();
 }
 
 static void
diff --git a/arch/alpha/kernel/proto.h b/arch/alpha/kernel/proto.h
index 95912ecc65e1..708d5ca87782 100644
--- a/arch/alpha/kernel/proto.h
+++ b/arch/alpha/kernel/proto.h
@@ -108,6 +108,15 @@ extern int wildfire_cpuid_to_nid(int);
 extern unsigned long wildfire_node_mem_start(int);
 extern unsigned long wildfire_node_mem_size(int);
 
+/* console.c */
+#ifdef CONFIG_VGA_HOSE
+extern void find_console_vga_hose(void);
+extern void locate_and_init_vga(void *(*)(void *, void *));
+#else
+static inline void find_console_vga_hose(void) { }
+static inline void locate_and_init_vga(void *(*sel_func)(void *, void *)) { }
+#endif
+
 /* setup.c */
 extern unsigned long srm_hae;
 extern int boot_cpuid;
diff --git a/arch/alpha/kernel/sys_dp264.c b/arch/alpha/kernel/sys_dp264.c
index 85d2f933dd07..c71b0fd7a61f 100644
--- a/arch/alpha/kernel/sys_dp264.c
+++ b/arch/alpha/kernel/sys_dp264.c
@@ -543,6 +543,7 @@ dp264_init_pci(void)
 {
         common_init_pci();
         SMC669_Init(0);
+        locate_and_init_vga(NULL);
 }
 
 static void __init
@@ -551,6 +552,14 @@ monet_init_pci(void)
         common_init_pci();
         SMC669_Init(1);
         es1888_init();
+        locate_and_init_vga(NULL);
+}
+
+static void __init
+clipper_init_pci(void)
+{
+        common_init_pci();
+        locate_and_init_vga(NULL);
 }
 
 static void __init
@@ -655,7 +664,7 @@ struct alpha_machine_vector clipper_mv __initmv = {
         .init_arch              = tsunami_init_arch,
         .init_irq               = clipper_init_irq,
         .init_rtc               = common_init_rtc,
-        .init_pci               = common_init_pci,
+        .init_pci               = clipper_init_pci,
         .kill_arch              = tsunami_kill_arch,
         .pci_map_irq            = clipper_map_irq,
         .pci_swizzle            = common_swizzle,
diff --git a/arch/alpha/kernel/sys_marvel.c b/arch/alpha/kernel/sys_marvel.c
index e349f03b830e..0bcb968cb60a 100644
--- a/arch/alpha/kernel/sys_marvel.c
+++ b/arch/alpha/kernel/sys_marvel.c
@@ -22,6 +22,7 @@
 #include <asm/core_marvel.h>
 #include <asm/hwrpb.h>
 #include <asm/tlbflush.h>
+#include <asm/vga.h>
 
 #include "proto.h"
 #include "err_impl.h"
@@ -412,10 +413,7 @@ marvel_init_pci(void)
 
         pci_probe_only = 1;
         common_init_pci();
-
-#ifdef CONFIG_VGA_HOSE
         locate_and_init_vga(NULL);
-#endif
 
         /* Clear any io7 errors.  */
         for (io7 = NULL; (io7 = marvel_next_io7(io7)) != NULL; ) 
diff --git a/arch/alpha/kernel/sys_titan.c b/arch/alpha/kernel/sys_titan.c
index f009b7bc0943..1d3c1398c428 100644
--- a/arch/alpha/kernel/sys_titan.c
+++ b/arch/alpha/kernel/sys_titan.c
@@ -331,9 +331,7 @@ titan_init_pci(void)
         pci_probe_only = 1;
         common_init_pci();
         SMC669_Init(0);
-#ifdef CONFIG_VGA_HOSE
         locate_and_init_vga(NULL);
-#endif
 }