staging: sm750fb: Cleanup the type of mmio750

This patch assigns the more appropriate void* type to the mmio750 variable
eliminating an unnecessary volatile qualifier in the process. Additionally it
updates parameter types as necessary where those parameters interact with
mmio750, removes unnecessary casts and updates the type of the
lynx_share->pvReg field which is passed to the ddk750_set_mmio method.

As a consequence, this patch fixes the following sparse warning:-

drivers/staging/sm750fb/ddk750_help.c:12:17: warning: incorrect type in assignment (different address spaces)
Signed-off-by: Lorenzo Stoakes <lstoakes@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/sm750fb/ddk750_chip.h

@@ -5,6 +5,8 @@
 #define SM750LE_REVISION_ID ((unsigned char)0xfe)
 #endif
 
+#include <linux/io.h>
+
 /* This is all the chips recognized by this library */
 typedef enum _logical_chip_type_t
 {
@@ -72,7 +74,7 @@ logical_chip_type_t getChipType(void);
 unsigned int calcPllValue(unsigned int request,pll_value_t *pll);
 unsigned int calcPllValue2(unsigned int,pll_value_t *);
 unsigned int formatPllReg(pll_value_t *pPLL);
-void ddk750_set_mmio(volatile unsigned char *,unsigned short,char);
+void ddk750_set_mmio(void __iomem *,unsigned short,char);
 unsigned int ddk750_getVMSize(void);
 int ddk750_initHw(initchip_param_t *);
 unsigned int getPllValue(clock_type_t clockType, pll_value_t *pPLL);

drivers/staging/sm750fb/ddk750_help.c

@@ -2,12 +2,12 @@
 //#include "ddk750_chip.h"
 #include "ddk750_help.h"
 
-volatile unsigned char __iomem * mmio750 = NULL;
+void __iomem * mmio750 = NULL;
 char revId750 = 0;
 unsigned short devId750 = 0;
 
 /* after driver mapped io registers, use this function first */
-void ddk750_set_mmio(volatile unsigned char * addr,unsigned short devId,char revId)
+void ddk750_set_mmio(void __iomem * addr,unsigned short devId,char revId)
 {
 	mmio750 = addr;
 	devId750 = devId;

drivers/staging/sm750fb/ddk750_help.h

@@ -12,14 +12,14 @@
 #if 0
 /* if 718 big endian turned on,be aware that don't use this driver for general use,only for ppc big-endian */
 #warning "big endian on target cpu and enable nature big endian support of 718 capability !"
-#define PEEK32(addr)  			__raw_readl((void __iomem *)(mmio750)+(addr))
-#define POKE32(addr,data) 		__raw_writel((data),(void __iomem*)(mmio750)+(addr))
+#define PEEK32(addr)  			__raw_readl(mmio750 + addr)
+#define POKE32(addr,data) 		__raw_writel(data, mmio750 + addr)
 #else /* software control endianess */
-#define PEEK32(addr) readl((addr)+mmio750)
-#define POKE32(addr,data) writel((data),(addr)+mmio750)
+#define PEEK32(addr) readl(addr + mmio750)
+#define POKE32(addr,data) writel(data, addr + mmio750)
 #endif
 
-extern volatile unsigned  char __iomem * mmio750;
+extern void __iomem * mmio750;
 extern char revId750;
 extern unsigned short devId750;
 #else

drivers/staging/sm750fb/sm750.h

@@ -63,7 +63,7 @@ struct lynx_share{
 	unsigned long vidreg_start;
 	__u32 vidmem_size;
 	__u32 vidreg_size;
-	volatile unsigned char __iomem * pvReg;
+	void __iomem * pvReg;
 	unsigned char __iomem * pvMem;
 	/* locks*/
 	spinlock_t slock;