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@@ -23,6 +23,7 @@
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#ifdef __KERNEL__
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#include <linux/types.h>
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+#include <linux/kernel.h>
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#include <asm/byteorder.h>
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#include <asm/memory.h>
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#include <asm/barriers.h>
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@@ -315,9 +316,105 @@ extern void _memset_io(unsigned long, int, size_t);
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extern void __readwrite_bug(const char *fn);
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+/* Optimized copy functions to read from/write to IO sapce */
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+#ifdef CONFIG_ARM64
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+/*
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+ * Copy data from IO memory space to "real" memory space.
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+ */
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+static inline
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+void __memcpy_fromio(void *to, const volatile void __iomem *from, size_t count)
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+{
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+ while (count && !IS_ALIGNED((unsigned long)from, 8)) {
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+ *(u8 *)to = __raw_readb(from);
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+ from++;
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+ to++;
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+ count--;
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+ }
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+
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+ while (count >= 8) {
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+ *(u64 *)to = __raw_readq(from);
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+ from += 8;
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+ to += 8;
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+ count -= 8;
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+ }
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+
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+ while (count) {
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+ *(u8 *)to = __raw_readb(from);
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+ from++;
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+ to++;
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+ count--;
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+ }
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+}
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+
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+/*
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+ * Copy data from "real" memory space to IO memory space.
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+ */
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+static inline
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+void __memcpy_toio(volatile void __iomem *to, const void *from, size_t count)
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+{
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+ while (count && !IS_ALIGNED((unsigned long)to, 8)) {
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+ __raw_writeb(*(u8 *)from, to);
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+ from++;
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+ to++;
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+ count--;
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+ }
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+
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+ while (count >= 8) {
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+ __raw_writeq(*(u64 *)from, to);
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+ from += 8;
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+ to += 8;
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+ count -= 8;
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+ }
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+
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+ while (count) {
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+ __raw_writeb(*(u8 *)from, to);
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+ from++;
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+ to++;
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+ count--;
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+ }
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+}
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+
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+/*
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+ * "memset" on IO memory space.
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+ */
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+static inline
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+void __memset_io(volatile void __iomem *dst, int c, size_t count)
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+{
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+ u64 qc = (u8)c;
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+
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+ qc |= qc << 8;
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+ qc |= qc << 16;
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+ qc |= qc << 32;
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+
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+ while (count && !IS_ALIGNED((unsigned long)dst, 8)) {
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+ __raw_writeb(c, dst);
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+ dst++;
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+ count--;
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+ }
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+
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+ while (count >= 8) {
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+ __raw_writeq(qc, dst);
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+ dst += 8;
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+ count -= 8;
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+ }
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+
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+ while (count) {
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+ __raw_writeb(c, dst);
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+ dst++;
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+ count--;
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+ }
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+}
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+#endif /* CONFIG_ARM64 */
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+
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+#ifdef CONFIG_ARM64
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+#define memset_io(a, b, c) __memset_io((a), (b), (c))
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+#define memcpy_fromio(a, b, c) __memcpy_fromio((a), (b), (c))
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+#define memcpy_toio(a, b, c) __memcpy_toio((a), (b), (c))
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+#else
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#define memset_io(a, b, c) memset((void *)(a), (b), (c))
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#define memcpy_fromio(a, b, c) memcpy((a), (void *)(b), (c))
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#define memcpy_toio(a, b, c) memcpy((void *)(a), (b), (c))
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+#endif
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/*
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* If this architecture has ISA IO, then define the isa_read/isa_write
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