ARM: Add fixed PCI i/o mapping

This adds a fixed virtual mapping for PCI i/o addresses. The mapping is
located at the last 2MB of vmalloc region (0xfee00000-0xff000000). 2MB
is used to align with PMD size, but IO_SPACE_LIMIT is 1MB. The space
is reserved after .map_io and can be mapped at any time later with
pci_ioremap_io. Platforms which need early i/o mapping (e.g. for vga
console) can call pci_map_io_early in their .map_io function.

This has changed completely from the 1st implementation which only
supported creating the static mapping at .map_io.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Cc: Russell King <linux@arm.linux.org.uk>
Acked-by: Nicolas Pitre <nico@linaro.org>

1 files changed, 43 insertions, 11 deletions

diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index cf4528d51774..714a7fd99ca3 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -31,6 +31,7 @@
 
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
+#include <asm/mach/pci.h>
 
 #include "mm.h"
 
@@ -216,7 +217,7 @@ static struct mem_type mem_types[] = {
                 .prot_l1        = PMD_TYPE_TABLE,
                 .prot_sect      = PROT_SECT_DEVICE | PMD_SECT_WB,
                 .domain         = DOMAIN_IO,
-        },      
+        },
         [MT_DEVICE_WC] = {      /* ioremap_wc */
                 .prot_pte       = PROT_PTE_DEVICE | L_PTE_MT_DEV_WC,
                 .prot_l1        = PMD_TYPE_TABLE,
@@ -783,14 +784,27 @@ void __init iotable_init(struct map_desc *io_desc, int nr)
                 create_mapping(md);
                 vm->addr = (void *)(md->virtual & PAGE_MASK);
                 vm->size = PAGE_ALIGN(md->length + (md->virtual & ~PAGE_MASK));
-                vm->phys_addr = __pfn_to_phys(md->pfn); 
-                vm->flags = VM_IOREMAP | VM_ARM_STATIC_MAPPING; 
+                vm->phys_addr = __pfn_to_phys(md->pfn);
+                vm->flags = VM_IOREMAP | VM_ARM_STATIC_MAPPING;
                 vm->flags |= VM_ARM_MTYPE(md->type);
                 vm->caller = iotable_init;
                 vm_area_add_early(vm++);
         }
 }
 
+void __init vm_reserve_area_early(unsigned long addr, unsigned long size,
+                                  void *caller)
+{
+        struct vm_struct *vm;
+
+        vm = early_alloc_aligned(sizeof(*vm), __alignof__(*vm));
+        vm->addr = (void *)addr;
+        vm->size = size;
+        vm->flags = VM_IOREMAP | VM_ARM_STATIC_MAPPING;
+        vm->caller = caller;
+        vm_area_add_early(vm);
+}
+
 #ifndef CONFIG_ARM_LPAE
 
 /*
@@ -808,14 +822,7 @@ void __init iotable_init(struct map_desc *io_desc, int nr)
 
 static void __init pmd_empty_section_gap(unsigned long addr)
 {
-        struct vm_struct *vm;
-
-        vm = early_alloc_aligned(sizeof(*vm), __alignof__(*vm));
-        vm->addr = (void *)addr;
-        vm->size = SECTION_SIZE;
-        vm->flags = VM_IOREMAP | VM_ARM_STATIC_MAPPING;
-        vm->caller = pmd_empty_section_gap;
-        vm_area_add_early(vm);
+        vm_reserve_area_early(addr, SECTION_SIZE, pmd_empty_section_gap);
 }
 
 static void __init fill_pmd_gaps(void)
@@ -864,6 +871,28 @@ static void __init fill_pmd_gaps(void)
 #define fill_pmd_gaps() do { } while (0)
 #endif
 
+#if defined(CONFIG_PCI) && !defined(CONFIG_NEED_MACH_IO_H)
+static void __init pci_reserve_io(void)
+{
+        struct vm_struct *vm;
+        unsigned long addr;
+
+        /* we're still single threaded hence no lock needed here */
+        for (vm = vmlist; vm; vm = vm->next) {
+                if (!(vm->flags & VM_ARM_STATIC_MAPPING))
+                        continue;
+                addr = (unsigned long)vm->addr;
+                addr &= ~(SZ_2M - 1);
+                if (addr == PCI_IO_VIRT_BASE)
+                        return;
+
+        }
+        vm_reserve_area_early(PCI_IO_VIRT_BASE, SZ_2M, pci_reserve_io);
+}
+#else
+#define pci_reserve_io() do { } while (0)
+#endif
+
 static void * __initdata vmalloc_min =
         (void *)(VMALLOC_END - (240 << 20) - VMALLOC_OFFSET);
 
@@ -1147,6 +1176,9 @@ static void __init devicemaps_init(struct machine_desc *mdesc)
                 mdesc->map_io();
         fill_pmd_gaps();
 
+        /* Reserve fixed i/o space in VMALLOC region */
+        pci_reserve_io();
+
         /*
          * Finally flush the caches and tlb to ensure that we're in a
          * consistent state wrt the writebuffer.  This also ensures that