Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 277 insertions, 0 deletions

diff --git a/arch/m68k/include/asm/cacheflush_mm.h b/arch/m68k/include/asm/cacheflush_mm.h
new file mode 100644
index 000000000..1e2544eca
--- /dev/null
+++ b/arch/m68k/include/asm/cacheflush_mm.h
@@ -0,0 +1,277 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _M68K_CACHEFLUSH_H
+#define _M68K_CACHEFLUSH_H
+
+#include <linux/mm.h>
+#ifdef CONFIG_COLDFIRE
+#include <asm/mcfsim.h>
+#endif
+
+/* cache code */
+#define FLUSH_I_AND_D	(0x00000808)
+#define FLUSH_I		(0x00000008)
+
+#ifndef ICACHE_MAX_ADDR
+#define ICACHE_MAX_ADDR	0
+#define ICACHE_SET_MASK	0
+#define DCACHE_MAX_ADDR	0
+#define DCACHE_SETMASK	0
+#endif
+#ifndef CACHE_MODE
+#define	CACHE_MODE	0
+#define	CACR_ICINVA	0
+#define	CACR_DCINVA	0
+#define	CACR_BCINVA	0
+#endif
+
+/*
+ * ColdFire architecture has no way to clear individual cache lines, so we
+ * are stuck invalidating all the cache entries when we want a clear operation.
+ */
+static inline void clear_cf_icache(unsigned long start, unsigned long end)
+{
+	__asm__ __volatile__ (
+		"movec	%0,%%cacr\n\t"
+		"nop"
+		:
+		: "r" (CACHE_MODE | CACR_ICINVA | CACR_BCINVA));
+}
+
+static inline void clear_cf_dcache(unsigned long start, unsigned long end)
+{
+	__asm__ __volatile__ (
+		"movec	%0,%%cacr\n\t"
+		"nop"
+		:
+		: "r" (CACHE_MODE | CACR_DCINVA));
+}
+
+static inline void clear_cf_bcache(unsigned long start, unsigned long end)
+{
+	__asm__ __volatile__ (
+		"movec	%0,%%cacr\n\t"
+		"nop"
+		:
+		: "r" (CACHE_MODE | CACR_ICINVA | CACR_BCINVA | CACR_DCINVA));
+}
+
+/*
+ * Use the ColdFire cpushl instruction to push (and invalidate) cache lines.
+ * The start and end addresses are cache line numbers not memory addresses.
+ */
+static inline void flush_cf_icache(unsigned long start, unsigned long end)
+{
+	unsigned long set;
+
+	for (set = start; set <= end; set += (0x10 - 3)) {
+		__asm__ __volatile__ (
+			"cpushl %%ic,(%0)\n\t"
+			"addq%.l #1,%0\n\t"
+			"cpushl %%ic,(%0)\n\t"
+			"addq%.l #1,%0\n\t"
+			"cpushl %%ic,(%0)\n\t"
+			"addq%.l #1,%0\n\t"
+			"cpushl %%ic,(%0)"
+			: "=a" (set)
+			: "a" (set));
+	}
+}
+
+static inline void flush_cf_dcache(unsigned long start, unsigned long end)
+{
+	unsigned long set;
+
+	for (set = start; set <= end; set += (0x10 - 3)) {
+		__asm__ __volatile__ (
+			"cpushl %%dc,(%0)\n\t"
+			"addq%.l #1,%0\n\t"
+			"cpushl %%dc,(%0)\n\t"
+			"addq%.l #1,%0\n\t"
+			"cpushl %%dc,(%0)\n\t"
+			"addq%.l #1,%0\n\t"
+			"cpushl %%dc,(%0)"
+			: "=a" (set)
+			: "a" (set));
+	}
+}
+
+static inline void flush_cf_bcache(unsigned long start, unsigned long end)
+{
+	unsigned long set;
+
+	for (set = start; set <= end; set += (0x10 - 3)) {
+		__asm__ __volatile__ (
+			"cpushl %%bc,(%0)\n\t"
+			"addq%.l #1,%0\n\t"
+			"cpushl %%bc,(%0)\n\t"
+			"addq%.l #1,%0\n\t"
+			"cpushl %%bc,(%0)\n\t"
+			"addq%.l #1,%0\n\t"
+			"cpushl %%bc,(%0)"
+			: "=a" (set)
+			: "a" (set));
+	}
+}
+
+/*
+ * Cache handling functions
+ */
+
+static inline void flush_icache(void)
+{
+	if (CPU_IS_COLDFIRE) {
+		flush_cf_icache(0, ICACHE_MAX_ADDR);
+	} else if (CPU_IS_040_OR_060) {
+		asm volatile (	"nop\n"
+			"	.chip	68040\n"
+			"	cpusha	%bc\n"
+			"	.chip	68k");
+	} else {
+		unsigned long tmp;
+		asm volatile (	"movec	%%cacr,%0\n"
+			"	or.w	%1,%0\n"
+			"	movec	%0,%%cacr"
+			: "=&d" (tmp)
+			: "id" (FLUSH_I));
+	}
+}
+
+/*
+ * invalidate the cache for the specified memory range.
+ * It starts at the physical address specified for
+ * the given number of bytes.
+ */
+extern void cache_clear(unsigned long paddr, int len);
+/*
+ * push any dirty cache in the specified memory range.
+ * It starts at the physical address specified for
+ * the given number of bytes.
+ */
+extern void cache_push(unsigned long paddr, int len);
+
+/*
+ * push and invalidate pages in the specified user virtual
+ * memory range.
+ */
+extern void cache_push_v(unsigned long vaddr, int len);
+
+/* This is needed whenever the virtual mapping of the current
+   process changes.  */
+#define __flush_cache_all()					\
+({								\
+	if (CPU_IS_COLDFIRE) {					\
+		flush_cf_dcache(0, DCACHE_MAX_ADDR);		\
+	} else if (CPU_IS_040_OR_060) {				\
+		__asm__ __volatile__("nop\n\t"			\
+				     ".chip 68040\n\t"		\
+				     "cpusha %dc\n\t"		\
+				     ".chip 68k");		\
+	} else {						\
+		unsigned long _tmp;				\
+		__asm__ __volatile__("movec %%cacr,%0\n\t"	\
+				     "orw %1,%0\n\t"		\
+				     "movec %0,%%cacr"		\
+				     : "=&d" (_tmp)		\
+				     : "di" (FLUSH_I_AND_D));	\
+	}							\
+})
+
+#define __flush_cache_030()					\
+({								\
+	if (CPU_IS_020_OR_030) {				\
+		unsigned long _tmp;				\
+		__asm__ __volatile__("movec %%cacr,%0\n\t"	\
+				     "orw %1,%0\n\t"		\
+				     "movec %0,%%cacr"		\
+				     : "=&d" (_tmp)		\
+				     : "di" (FLUSH_I_AND_D));	\
+	}							\
+})
+
+#define flush_cache_all() __flush_cache_all()
+
+#define flush_cache_vmap(start, end)		flush_cache_all()
+#define flush_cache_vunmap(start, end)		flush_cache_all()
+
+static inline void flush_cache_mm(struct mm_struct *mm)
+{
+	if (mm == current->mm)
+		__flush_cache_030();
+}
+
+#define flush_cache_dup_mm(mm)			flush_cache_mm(mm)
+
+/* flush_cache_range/flush_cache_page must be macros to avoid
+   a dependency on linux/mm.h, which includes this file... */
+static inline void flush_cache_range(struct vm_area_struct *vma,
+				     unsigned long start,
+				     unsigned long end)
+{
+	if (vma->vm_mm == current->mm)
+	        __flush_cache_030();
+}
+
+static inline void flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, unsigned long pfn)
+{
+	if (vma->vm_mm == current->mm)
+	        __flush_cache_030();
+}
+
+
+/* Push the page at kernel virtual address and clear the icache */
+/* RZ: use cpush %bc instead of cpush %dc, cinv %ic */
+static inline void __flush_page_to_ram(void *vaddr)
+{
+	if (CPU_IS_COLDFIRE) {
+		unsigned long addr, start, end;
+		addr = ((unsigned long) vaddr) & ~(PAGE_SIZE - 1);
+		start = addr & ICACHE_SET_MASK;
+		end = (addr + PAGE_SIZE - 1) & ICACHE_SET_MASK;
+		if (start > end) {
+			flush_cf_bcache(0, end);
+			end = ICACHE_MAX_ADDR;
+		}
+		flush_cf_bcache(start, end);
+	} else if (CPU_IS_040_OR_060) {
+		__asm__ __volatile__("nop\n\t"
+				     ".chip 68040\n\t"
+				     "cpushp %%bc,(%0)\n\t"
+				     ".chip 68k"
+				     : : "a" (__pa(vaddr)));
+	} else {
+		unsigned long _tmp;
+		__asm__ __volatile__("movec %%cacr,%0\n\t"
+				     "orw %1,%0\n\t"
+				     "movec %0,%%cacr"
+				     : "=&d" (_tmp)
+				     : "di" (FLUSH_I));
+	}
+}
+
+#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
+#define flush_dcache_page(page)		__flush_page_to_ram(page_address(page))
+#define flush_dcache_mmap_lock(mapping)		do { } while (0)
+#define flush_dcache_mmap_unlock(mapping)	do { } while (0)
+#define flush_icache_page(vma, page)	__flush_page_to_ram(page_address(page))
+
+extern void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
+				    unsigned long addr, int len);
+extern void flush_icache_range(unsigned long address, unsigned long endaddr);
+
+static inline void copy_to_user_page(struct vm_area_struct *vma,
+				     struct page *page, unsigned long vaddr,
+				     void *dst, void *src, int len)
+{
+	flush_cache_page(vma, vaddr, page_to_pfn(page));
+	memcpy(dst, src, len);
+	flush_icache_user_range(vma, page, vaddr, len);
+}
+static inline void copy_from_user_page(struct vm_area_struct *vma,
+				       struct page *page, unsigned long vaddr,
+				       void *dst, void *src, int len)
+{
+	flush_cache_page(vma, vaddr, page_to_pfn(page));
+	memcpy(dst, src, len);
+}
+
+#endif /* _M68K_CACHEFLUSH_H */