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authorAlbert Herranz <albert_herranz@yahoo.es>2009-12-12 06:31:54 +0000
committerGrant Likely <grant.likely@secretlab.ca>2009-12-12 22:24:32 -0700
commitc5df7f775148723de39274537a886e9502eef336 (patch)
tree548acbcef58b1d60308f7e7cd894d514583895a2
parentde32400dd26e743c5d500aa42d8d6818b79edb73 (diff)
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powerpc: allow ioremap within reserved memory regions
Add a flag to let a platform ioremap memory regions marked as reserved. This flag will be used later by the Nintendo Wii support code to allow ioremapping the I/O region sitting between MEM1 and MEM2 and marked as reserved RAM in the patch "wii: use both mem1 and mem2 as ram". This will no longer be needed when proper discontig memory support for 32-bit PowerPC is added to the kernel. Signed-off-by: Albert Herranz <albert_herranz@yahoo.es> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
-rw-r--r--arch/powerpc/mm/init_32.c5
-rw-r--r--arch/powerpc/mm/mmu_decl.h1
-rw-r--r--arch/powerpc/mm/pgtable_32.c4
-rw-r--r--include/linux/lmb.h1
-rw-r--r--lib/lmb.c7
5 files changed, 16 insertions, 2 deletions
diff --git a/arch/powerpc/mm/init_32.c b/arch/powerpc/mm/init_32.c
index 703c7c2e0d9..4ec900af332 100644
--- a/arch/powerpc/mm/init_32.c
+++ b/arch/powerpc/mm/init_32.c
@@ -82,6 +82,11 @@ extern struct task_struct *current_set[NR_CPUS];
int __map_without_bats;
int __map_without_ltlbs;
+/*
+ * This tells the system to allow ioremapping memory marked as reserved.
+ */
+int __allow_ioremap_reserved;
+
/* max amount of low RAM to map in */
unsigned long __max_low_memory = MAX_LOW_MEM;
diff --git a/arch/powerpc/mm/mmu_decl.h b/arch/powerpc/mm/mmu_decl.h
index 9aa39fe74f8..34dacc32250 100644
--- a/arch/powerpc/mm/mmu_decl.h
+++ b/arch/powerpc/mm/mmu_decl.h
@@ -115,6 +115,7 @@ extern void settlbcam(int index, unsigned long virt, phys_addr_t phys,
extern void invalidate_tlbcam_entry(int index);
extern int __map_without_bats;
+extern int __allow_ioremap_reserved;
extern unsigned long ioremap_base;
extern unsigned int rtas_data, rtas_size;
diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index b55bbe87acb..177e4038b43 100644
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c
@@ -26,6 +26,7 @@
#include <linux/vmalloc.h>
#include <linux/init.h>
#include <linux/highmem.h>
+#include <linux/lmb.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
@@ -191,7 +192,8 @@ __ioremap_caller(phys_addr_t addr, unsigned long size, unsigned long flags,
* Don't allow anybody to remap normal RAM that we're using.
* mem_init() sets high_memory so only do the check after that.
*/
- if (mem_init_done && (p < virt_to_phys(high_memory))) {
+ if (mem_init_done && (p < virt_to_phys(high_memory)) &&
+ !(__allow_ioremap_reserved && lmb_is_region_reserved(p, size))) {
printk("__ioremap(): phys addr 0x%llx is RAM lr %p\n",
(unsigned long long)p, __builtin_return_address(0));
return NULL;
diff --git a/include/linux/lmb.h b/include/linux/lmb.h
index 2442e3f3d03..ef82b8fcbdd 100644
--- a/include/linux/lmb.h
+++ b/include/linux/lmb.h
@@ -54,6 +54,7 @@ extern u64 __init lmb_phys_mem_size(void);
extern u64 lmb_end_of_DRAM(void);
extern void __init lmb_enforce_memory_limit(u64 memory_limit);
extern int __init lmb_is_reserved(u64 addr);
+extern int lmb_is_region_reserved(u64 base, u64 size);
extern int lmb_find(struct lmb_property *res);
extern void lmb_dump_all(void);
diff --git a/lib/lmb.c b/lib/lmb.c
index 0343c05609f..9cee17142b2 100644
--- a/lib/lmb.c
+++ b/lib/lmb.c
@@ -263,7 +263,7 @@ long __init lmb_reserve(u64 base, u64 size)
return lmb_add_region(_rgn, base, size);
}
-long __init lmb_overlaps_region(struct lmb_region *rgn, u64 base, u64 size)
+long lmb_overlaps_region(struct lmb_region *rgn, u64 base, u64 size)
{
unsigned long i;
@@ -493,6 +493,11 @@ int __init lmb_is_reserved(u64 addr)
return 0;
}
+int lmb_is_region_reserved(u64 base, u64 size)
+{
+ return lmb_overlaps_region(&lmb.reserved, base, size);
+}
+
/*
* Given a <base, len>, find which memory regions belong to this range.
* Adjust the request and return a contiguous chunk.