csky: Use va_pa_offset instead of phys_offset

The name of phys_offset is so common for global export and it may
conflict with some local name. So change phys_offset to va_pa_offset
which also used by riscv.

Also use __pa() and __va() instead of using phys_offset directly.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Arnd Bergmann <arnd@arndb.de>

arch/csky/abiv1/inc/abi/ckmmu.h

@@ -85,11 +85,11 @@ static inline void tlb_invalid_indexed(void)
 
 static inline void setup_pgd(unsigned long pgd, bool kernel)
 {
-	cpwcr("cpcr29", pgd);
+	cpwcr("cpcr29", pgd | BIT(0));
 }
 
 static inline unsigned long get_pgd(void)
 {
-	return cprcr("cpcr29");
+	return cprcr("cpcr29") & ~BIT(0);
 }
 #endif /* __ASM_CSKY_CKMMUV1_H */

arch/csky/abiv2/inc/abi/ckmmu.h

@@ -90,18 +90,16 @@ static inline void tlb_invalid_indexed(void)
 	mtcr("cr<8, 15>", 0x02000000);
 }
 
-/* setup hardrefil pgd */
-static inline unsigned long get_pgd(void)
-{
-	return mfcr("cr<29, 15>");
-}
-
 static inline void setup_pgd(unsigned long pgd, bool kernel)
 {
 	if (kernel)
-		mtcr("cr<28, 15>", pgd);
+		mtcr("cr<28, 15>", pgd | BIT(0));
 	else
-		mtcr("cr<29, 15>", pgd);
+		mtcr("cr<29, 15>", pgd | BIT(0));
 }
 
+static inline unsigned long get_pgd(void)
+{
+	return mfcr("cr<29, 15>") & ~BIT(0);
+}
 #endif /* __ASM_CSKY_CKMMUV2_H */

arch/csky/include/asm/mmu_context.h

@@ -14,23 +14,10 @@
 #include <linux/sched.h>
 #include <abi/ckmmu.h>
 
-static inline void tlbmiss_handler_setup_pgd(unsigned long pgd, bool kernel)
-{
-	pgd -= PAGE_OFFSET;
-	pgd += phys_offset;
-	pgd |= 1;
-	setup_pgd(pgd, kernel);
-}
-
 #define TLBMISS_HANDLER_SETUP_PGD(pgd) \
-	tlbmiss_handler_setup_pgd((unsigned long)pgd, 0)
+	setup_pgd(__pa(pgd), false)
 #define TLBMISS_HANDLER_SETUP_PGD_KERNEL(pgd) \
-	tlbmiss_handler_setup_pgd((unsigned long)pgd, 1)
-
-static inline unsigned long tlb_get_pgd(void)
-{
-	return ((get_pgd() - phys_offset) & ~1) + PAGE_OFFSET;
-}
+	setup_pgd(__pa(pgd), true)
 
 #define cpu_context(cpu, mm)	((mm)->context.asid[cpu])
 #define cpu_asid(cpu, mm)	(cpu_context((cpu), (mm)) & ASID_MASK)

arch/csky/include/asm/page.h

@@ -72,13 +72,13 @@ typedef struct page *pgtable_t;
 #define __pgd(x)	((pgd_t) { (x) })
 #define __pgprot(x)	((pgprot_t) { (x) })
 
-extern unsigned long phys_offset;
+extern unsigned long va_pa_offset;
 
-#define ARCH_PFN_OFFSET	PFN_DOWN(phys_offset + PHYS_OFFSET_OFFSET)
+#define ARCH_PFN_OFFSET	PFN_DOWN(va_pa_offset + PHYS_OFFSET_OFFSET)
+
+#define __pa(x)		 ((unsigned long)(x) - PAGE_OFFSET + va_pa_offset)
+#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - va_pa_offset))
 
-#define __pa(x)		((unsigned long)(x) - PAGE_OFFSET + phys_offset)
-#define __va(x)		((void *)((unsigned long)(x) + PAGE_OFFSET - \
-				  phys_offset))
 #define __pa_symbol(x)	__pa(RELOC_HIDE((unsigned long)(x), 0))
 
 #define MAP_NR(x)	PFN_DOWN((unsigned long)(x) - PAGE_OFFSET - \

arch/csky/kernel/entry.S

@@ -40,7 +40,7 @@ ENTRY(csky_\name)
 	WR_MCIR	a2
 #endif
 	bclri   r6, 0
-	lrw	a2, phys_offset
+	lrw	a2, va_pa_offset
 	ld.w	a2, (a2, 0)
 	subu	r6, a2
 	bseti	r6, 31
@@ -51,7 +51,7 @@ ENTRY(csky_\name)
 	addu    r6, a2
 	ldw     r6, (r6)
 
-	lrw	a2, phys_offset
+	lrw	a2, va_pa_offset
 	ld.w	a2, (a2, 0)
 	subu	r6, a2
 	bseti	r6, 31

arch/csky/kernel/setup.c

@@ -142,8 +142,8 @@ void __init setup_arch(char **cmdline_p)
 #endif
 }
 
-unsigned long phys_offset;
-EXPORT_SYMBOL(phys_offset);
+unsigned long va_pa_offset;
+EXPORT_SYMBOL(va_pa_offset);
 
 asmlinkage __visible void __init csky_start(unsigned int unused,
 					    void *dtb_start)
@@ -151,7 +151,7 @@ asmlinkage __visible void __init csky_start(unsigned int unused,
 	/* Clean up bss section */
 	memset(__bss_start, 0, __bss_stop - __bss_start);
 
-	phys_offset = read_mmu_msa0() & ~(SSEG_SIZE - 1);
+	va_pa_offset = read_mmu_msa0() & ~(SSEG_SIZE - 1);
 
 	pre_trap_init();
 	pre_mmu_init();

arch/csky/mm/fault.c

@@ -81,7 +81,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
 
 		unsigned long pgd_base;
 
-		pgd_base = tlb_get_pgd();
+		pgd_base = __va(get_pgd());
 		pgd = (pgd_t *)pgd_base + offset;
 		pgd_k = init_mm.pgd + offset;