[POWERPC] Change rheap functions to use ulongs instead of pointers

The rheap allocation functions return a pointer, but the actual value is based
on how the heap was initialized, and so it can be anything, e.g. an offset
into a buffer.  A ulong is a better representation of the value returned by
the allocation functions.

This patch changes all of the relevant rheap functions to use a unsigned long
integers instead of a pointer.  In case of an error, the value returned is
a negative error code that has been cast to an unsigned long.  The caller can
use the IS_ERR_VALUE() macro to check for this.

All code which calls the rheap functions is updated accordingly.  Macros
IS_MURAM_ERR() and IS_DPERR(), have been deleted in favor of IS_ERR_VALUE().

Also added error checking to rh_attach_region().

Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

3 files changed, 18 insertions, 28 deletions

diff --git a/include/asm-ppc/commproc.h b/include/asm-ppc/commproc.h
index 4f99df1..3972487 100644
--- a/include/asm-ppc/commproc.h
+++ b/include/asm-ppc/commproc.h
@@ -63,20 +63,15 @@
 #define CPM_DATAONLY_SIZE	((uint)0x0700)
 #define CPM_DP_NOSPACE		((uint)0x7fffffff)
 
-static inline long IS_DPERR(const uint offset)
-{
-	return (uint)offset > (uint)-1000L;
-}
-
 /* Export the base address of the communication processor registers
  * and dual port ram.
  */
 extern	cpm8xx_t	*cpmp;		/* Pointer to comm processor */
-extern uint cpm_dpalloc(uint size, uint align);
-extern int cpm_dpfree(uint offset);
-extern uint cpm_dpalloc_fixed(uint offset, uint size, uint align);
+extern unsigned long cpm_dpalloc(uint size, uint align);
+extern int cpm_dpfree(unsigned long offset);
+extern unsigned long cpm_dpalloc_fixed(unsigned long offset, uint size, uint align);
 extern void cpm_dpdump(void);
-extern void *cpm_dpram_addr(uint offset);
+extern void *cpm_dpram_addr(unsigned long offset);
 extern uint cpm_dpram_phys(u8* addr);
 extern void cpm_setbrg(uint brg, uint rate);
 
diff --git a/include/asm-ppc/cpm2.h b/include/asm-ppc/cpm2.h
index 220cc2d..12a2860 100644
--- a/include/asm-ppc/cpm2.h
+++ b/include/asm-ppc/cpm2.h
@@ -104,21 +104,16 @@
  */
 #define NUM_CPM_HOST_PAGES	2
 
-static inline long IS_DPERR(const uint offset)
-{
-	return (uint)offset > (uint)-1000L;
-}
-
 /* Export the base address of the communication processor registers
  * and dual port ram.
  */
 extern		cpm_cpm2_t	*cpmp;	 /* Pointer to comm processor */
 
-extern uint cpm_dpalloc(uint size, uint align);
-extern int cpm_dpfree(uint offset);
-extern uint cpm_dpalloc_fixed(uint offset, uint size, uint align);
+extern unsigned long cpm_dpalloc(uint size, uint align);
+extern int cpm_dpfree(unsigned long offset);
+extern unsigned long cpm_dpalloc_fixed(unsigned long offset, uint size, uint align);
 extern void cpm_dpdump(void);
-extern void *cpm_dpram_addr(uint offset);
+extern void *cpm_dpram_addr(unsigned long offset);
 extern void cpm_setbrg(uint brg, uint rate);
 extern void cpm2_fastbrg(uint brg, uint rate, int div16);
 extern void cpm2_reset(void);
diff --git a/include/asm-ppc/rheap.h b/include/asm-ppc/rheap.h
index 39a10d8..1723817 100644
--- a/include/asm-ppc/rheap.h
+++ b/include/asm-ppc/rheap.h
@@ -18,7 +18,7 @@
 
 typedef struct _rh_block {
 	struct list_head list;
-	void *start;
+	unsigned long start;
 	int size;
 	const char *owner;
 } rh_block_t;
@@ -37,8 +37,8 @@ typedef struct _rh_info {
 #define RHIF_STATIC_INFO	0x1
 #define RHIF_STATIC_BLOCK	0x2
 
-typedef struct rh_stats_t {
-	void *start;
+typedef struct _rh_stats {
+	unsigned long start;
 	int size;
 	const char *owner;
 } rh_stats_t;
@@ -57,24 +57,24 @@ extern void rh_init(rh_info_t * info, unsigned int alignment, int max_blocks,
 		    rh_block_t * block);
 
 /* Attach a free region to manage */
-extern int rh_attach_region(rh_info_t * info, void *start, int size);
+extern int rh_attach_region(rh_info_t * info, unsigned long start, int size);
 
 /* Detach a free region */
-extern void *rh_detach_region(rh_info_t * info, void *start, int size);
+extern unsigned long rh_detach_region(rh_info_t * info, unsigned long start, int size);
 
 /* Allocate the given size from the remote heap (with alignment) */
-extern void *rh_alloc_align(rh_info_t * info, int size, int alignment,
+extern unsigned long rh_alloc_align(rh_info_t * info, int size, int alignment,
 		const char *owner);
 
 /* Allocate the given size from the remote heap */
-extern void *rh_alloc(rh_info_t * info, int size, const char *owner);
+extern unsigned long rh_alloc(rh_info_t * info, int size, const char *owner);
 
 /* Allocate the given size from the given address */
-extern void *rh_alloc_fixed(rh_info_t * info, void *start, int size,
+extern unsigned long rh_alloc_fixed(rh_info_t * info, unsigned long start, int size,
 			    const char *owner);
 
 /* Free the allocated area */
-extern int rh_free(rh_info_t * info, void *start);
+extern int rh_free(rh_info_t * info, unsigned long start);
 
 /* Get stats for debugging purposes */
 extern int rh_get_stats(rh_info_t * info, int what, int max_stats,
@@ -84,6 +84,6 @@ extern int rh_get_stats(rh_info_t * info, int what, int max_stats,
 extern void rh_dump(rh_info_t * info);
 
 /* Set owner of taken block */
-extern int rh_set_owner(rh_info_t * info, void *start, const char *owner);
+extern int rh_set_owner(rh_info_t * info, unsigned long start, const char *owner);
 
 #endif				/* __ASM_PPC_RHEAP_H__ */