sh: Prevent 64-bit pgprot clobbering across ioremap implementations.

Presently 'flags' gets passed around a lot between the various ioremap
helpers and implementations, which is only 32-bits. In the X2TLB case
we use 64-bit pgprots which presently results in the upper 32bits being
chopped off (which handily include our read/write/exec permissions).

As such, we convert everything internally to using pgprot_t directly and
simply convert over with pgprot_val() where needed. With this in place,
transparent fixmap utilization for early ioremap works as expected.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/boards/board-sh7785lcr.c

@@ -21,6 +21,7 @@
 #include <linux/i2c-algo-pca.h>
 #include <linux/usb/r8a66597.h>
 #include <linux/irq.h>
+#include <linux/io.h>
 #include <linux/clk.h>
 #include <linux/errno.h>
 #include <mach/sh7785lcr.h>
@@ -332,15 +333,14 @@ static void __init sh7785lcr_setup(char **cmdline_p)
 	pm_power_off = sh7785lcr_power_off;
 
 	/* sm501 DRAM configuration */
-	sm501_reg = ioremap_fixed(SM107_REG_ADDR, SM501_DRAM_CONTROL,
-				  PAGE_KERNEL);
+	sm501_reg = ioremap_nocache(SM107_REG_ADDR, SM501_DRAM_CONTROL);
 	if (!sm501_reg) {
 		printk(KERN_ERR "%s: ioremap error.\n", __func__);
 		return;
 	}
 
 	writel(0x000307c2, sm501_reg + SM501_DRAM_CONTROL);
-	iounmap_fixed(sm501_reg);
+	iounmap(sm501_reg);
 }
 
 /* Return the board specific boot mode pin configuration */

arch/sh/boards/mach-landisk/setup.c

@@ -63,7 +63,7 @@ static int __init landisk_devices_setup(void)
 	/* open I/O area window */
 	paddrbase = virt_to_phys((void *)PA_AREA5_IO);
 	prot = PAGE_KERNEL_PCC(1, _PAGE_PCC_IO16);
-	cf_ide_base = p3_ioremap(paddrbase, PAGE_SIZE, prot.pgprot);
+	cf_ide_base = p3_ioremap(paddrbase, PAGE_SIZE, prot);
 	if (!cf_ide_base) {
 		printk("allocate_cf_area : can't open CF I/O window!\n");
 		return -ENOMEM;

arch/sh/boards/mach-lboxre2/setup.c

@@ -57,7 +57,7 @@ static int __init lboxre2_devices_setup(void)
 	paddrbase = virt_to_phys((void*)PA_AREA5_IO);
 	psize = PAGE_SIZE;
 	prot = PAGE_KERNEL_PCC( 1 , _PAGE_PCC_IO16);
-	cf0_io_base = (u32)p3_ioremap(paddrbase, psize, prot.pgprot);
+	cf0_io_base = (u32)p3_ioremap(paddrbase, psize, prot);
 	if (!cf0_io_base) {
 		printk(KERN_ERR "%s : can't open CF I/O window!\n" , __func__ );
 		return -ENOMEM;

arch/sh/boards/mach-sh03/setup.c

@@ -82,7 +82,7 @@ static int __init sh03_devices_setup(void)
 	/* open I/O area window */
 	paddrbase = virt_to_phys((void *)PA_AREA5_IO);
 	prot = PAGE_KERNEL_PCC(1, _PAGE_PCC_IO16);
-	cf_ide_base = p3_ioremap(paddrbase, PAGE_SIZE, prot.pgprot);
+	cf_ide_base = p3_ioremap(paddrbase, PAGE_SIZE, prot);
 	if (!cf_ide_base) {
 		printk("allocate_cf_area : can't open CF I/O window!\n");
 		return -ENOMEM;

arch/sh/include/asm/io.h

@@ -235,7 +235,7 @@ unsigned long long poke_real_address_q(unsigned long long addr,
  */
 #ifdef CONFIG_MMU
 void __iomem *__ioremap_caller(unsigned long offset, unsigned long size,
-			       unsigned long flags, void *caller);
+			       pgprot_t prot, void *caller);
 void __iounmap(void __iomem *addr);
 
 #ifdef CONFIG_IOREMAP_FIXED
@@ -254,13 +254,13 @@ static inline int iounmap_fixed(void __iomem *addr) { return -EINVAL; }
 #endif
 
 static inline void __iomem *
-__ioremap(unsigned long offset, unsigned long size, unsigned long flags)
+__ioremap(unsigned long offset, unsigned long size, pgprot_t prot)
 {
-	return __ioremap_caller(offset, size, flags, __builtin_return_address(0));
+	return __ioremap_caller(offset, size, prot, __builtin_return_address(0));
 }
 
 static inline void __iomem *
-__ioremap_29bit(unsigned long offset, unsigned long size, unsigned long flags)
+__ioremap_29bit(unsigned long offset, unsigned long size, pgprot_t prot)
 {
 #ifdef CONFIG_29BIT
 	unsigned long last_addr = offset + size - 1;
@@ -272,7 +272,7 @@ __ioremap_29bit(unsigned long offset, unsigned long size, unsigned long flags)
 	 * mapping must be done by the PMB or by using page tables.
 	 */
 	if (likely(PXSEG(offset) < P3SEG && PXSEG(last_addr) < P3SEG)) {
-		if (unlikely(flags & _PAGE_CACHABLE))
+		if (unlikely(pgprot_val(prot) & _PAGE_CACHABLE))
 			return (void __iomem *)P1SEGADDR(offset);
 
 		return (void __iomem *)P2SEGADDR(offset);
@@ -287,7 +287,7 @@ __ioremap_29bit(unsigned long offset, unsigned long size, unsigned long flags)
 }
 
 static inline void __iomem *
-__ioremap_mode(unsigned long offset, unsigned long size, unsigned long flags)
+__ioremap_mode(unsigned long offset, unsigned long size, pgprot_t prot)
 {
 	void __iomem *ret;
 
@@ -295,30 +295,39 @@ __ioremap_mode(unsigned long offset, unsigned long size, unsigned long flags)
 	if (ret)
 		return ret;
 
-	ret = __ioremap_29bit(offset, size, flags);
+	ret = __ioremap_29bit(offset, size, prot);
 	if (ret)
 		return ret;
 
-	return __ioremap(offset, size, flags);
+	return __ioremap(offset, size, prot);
 }
 #else
-#define __ioremap(offset, size, flags)		((void __iomem *)(offset))
-#define __ioremap_mode(offset, size, flags)	((void __iomem *)(offset))
+#define __ioremap(offset, size, prot)		((void __iomem *)(offset))
+#define __ioremap_mode(offset, size, prot)	((void __iomem *)(offset))
 #define __iounmap(addr)				do { } while (0)
 #endif /* CONFIG_MMU */
 
-#define ioremap(offset, size)				\
-	__ioremap_mode((offset), (size), 0)
-#define ioremap_nocache(offset, size)			\
-	__ioremap_mode((offset), (size), 0)
-#define ioremap_cache(offset, size)			\
-	__ioremap_mode((offset), (size), _PAGE_CACHABLE)
-#define p3_ioremap(offset, size, flags)			\
-	__ioremap((offset), (size), (flags))
-#define ioremap_prot(offset, size, flags)		\
-	__ioremap_mode((offset), (size), (flags))
-#define iounmap(addr)					\
-	__iounmap((addr))
+static inline void __iomem *
+ioremap(unsigned long offset, unsigned long size)
+{
+	return __ioremap_mode(offset, size, PAGE_KERNEL_NOCACHE);
+}
+
+static inline void __iomem *
+ioremap_cache(unsigned long offset, unsigned long size)
+{
+	return __ioremap_mode(offset, size, PAGE_KERNEL);
+}
+
+static inline void __iomem *
+ioremap_prot(resource_size_t offset, unsigned long size, unsigned long flags)
+{
+	return __ioremap_mode(offset, size, __pgprot(flags));
+}
+
+#define ioremap_nocache	ioremap
+#define p3_ioremap	__ioremap
+#define iounmap		__iounmap
 
 #define maybebadio(port) \
 	printk(KERN_ERR "bad PC-like io %s:%u for port 0x%lx at 0x%08x\n", \

arch/sh/mm/ioremap.c

@@ -35,11 +35,10 @@
  */
 void __iomem * __init_refok
 __ioremap_caller(unsigned long phys_addr, unsigned long size,
-		 unsigned long flags, void *caller)
+		 pgprot_t pgprot, void *caller)
 {
 	struct vm_struct *area;
 	unsigned long offset, last_addr, addr, orig_addr;
-	pgprot_t pgprot;
 
 	/* Don't allow wraparound or zero size */
 	last_addr = phys_addr + size - 1;
@@ -69,7 +68,7 @@ __ioremap_caller(unsigned long phys_addr, unsigned long size,
 	 * If we can't yet use the regular approach, go the fixmap route.
 	 */
 	if (!mem_init_done)
-		return ioremap_fixed(phys_addr, size, __pgprot(flags));
+		return ioremap_fixed(phys_addr, size, pgprot);
 
 	/*
 	 * Ok, go for it..
@@ -91,8 +90,9 @@ __ioremap_caller(unsigned long phys_addr, unsigned long size,
 	 * PMB entries are all pre-faulted.
 	 */
 	if (unlikely(phys_addr >= P1SEG)) {
-		unsigned long mapped = pmb_remap(addr, phys_addr, size, flags);
+		unsigned long mapped;
 
+		mapped = pmb_remap(addr, phys_addr, size, pgprot_val(pgprot));
 		if (likely(mapped)) {
 			addr		+= mapped;
 			phys_addr	+= mapped;
@@ -101,7 +101,6 @@ __ioremap_caller(unsigned long phys_addr, unsigned long size,
 	}
 #endif
 
-	pgprot = __pgprot(pgprot_val(PAGE_KERNEL_NOCACHE) | flags);
 	if (likely(size))
 		if (ioremap_page_range(addr, addr + size, phys_addr, pgprot)) {
 			vunmap((void *)orig_addr);