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-rw-r--r--arch/powerpc/kernel/io.c206
1 files changed, 206 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/io.c b/arch/powerpc/kernel/io.c
new file mode 100644
index 000000000..2f29b7d43
--- /dev/null
+++ b/arch/powerpc/kernel/io.c
@@ -0,0 +1,206 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * I/O string operations
+ * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
+ * Copyright (C) 2006 IBM Corporation
+ *
+ * Largely rewritten by Cort Dougan (cort@cs.nmt.edu)
+ * and Paul Mackerras.
+ *
+ * Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com)
+ * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com)
+ *
+ * Rewritten in C by Stephen Rothwell.
+ */
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/compiler.h>
+#include <linux/export.h>
+
+#include <asm/io.h>
+#include <asm/firmware.h>
+#include <asm/bug.h>
+
+/* See definition in io.h */
+bool isa_io_special;
+
+void _insb(const volatile u8 __iomem *port, void *buf, long count)
+{
+ u8 *tbuf = buf;
+ u8 tmp;
+
+ if (unlikely(count <= 0))
+ return;
+ asm volatile("sync");
+ do {
+ tmp = *port;
+ eieio();
+ *tbuf++ = tmp;
+ } while (--count != 0);
+ asm volatile("twi 0,%0,0; isync" : : "r" (tmp));
+}
+EXPORT_SYMBOL(_insb);
+
+void _outsb(volatile u8 __iomem *port, const void *buf, long count)
+{
+ const u8 *tbuf = buf;
+
+ if (unlikely(count <= 0))
+ return;
+ asm volatile("sync");
+ do {
+ *port = *tbuf++;
+ } while (--count != 0);
+ asm volatile("sync");
+}
+EXPORT_SYMBOL(_outsb);
+
+void _insw_ns(const volatile u16 __iomem *port, void *buf, long count)
+{
+ u16 *tbuf = buf;
+ u16 tmp;
+
+ if (unlikely(count <= 0))
+ return;
+ asm volatile("sync");
+ do {
+ tmp = *port;
+ eieio();
+ *tbuf++ = tmp;
+ } while (--count != 0);
+ asm volatile("twi 0,%0,0; isync" : : "r" (tmp));
+}
+EXPORT_SYMBOL(_insw_ns);
+
+void _outsw_ns(volatile u16 __iomem *port, const void *buf, long count)
+{
+ const u16 *tbuf = buf;
+
+ if (unlikely(count <= 0))
+ return;
+ asm volatile("sync");
+ do {
+ *port = *tbuf++;
+ } while (--count != 0);
+ asm volatile("sync");
+}
+EXPORT_SYMBOL(_outsw_ns);
+
+void _insl_ns(const volatile u32 __iomem *port, void *buf, long count)
+{
+ u32 *tbuf = buf;
+ u32 tmp;
+
+ if (unlikely(count <= 0))
+ return;
+ asm volatile("sync");
+ do {
+ tmp = *port;
+ eieio();
+ *tbuf++ = tmp;
+ } while (--count != 0);
+ asm volatile("twi 0,%0,0; isync" : : "r" (tmp));
+}
+EXPORT_SYMBOL(_insl_ns);
+
+void _outsl_ns(volatile u32 __iomem *port, const void *buf, long count)
+{
+ const u32 *tbuf = buf;
+
+ if (unlikely(count <= 0))
+ return;
+ asm volatile("sync");
+ do {
+ *port = *tbuf++;
+ } while (--count != 0);
+ asm volatile("sync");
+}
+EXPORT_SYMBOL(_outsl_ns);
+
+#define IO_CHECK_ALIGN(v,a) ((((unsigned long)(v)) & ((a) - 1)) == 0)
+
+notrace void
+_memset_io(volatile void __iomem *addr, int c, unsigned long n)
+{
+ void *p = (void __force *)addr;
+ u32 lc = c;
+ lc |= lc << 8;
+ lc |= lc << 16;
+
+ __asm__ __volatile__ ("sync" : : : "memory");
+ while(n && !IO_CHECK_ALIGN(p, 4)) {
+ *((volatile u8 *)p) = c;
+ p++;
+ n--;
+ }
+ while(n >= 4) {
+ *((volatile u32 *)p) = lc;
+ p += 4;
+ n -= 4;
+ }
+ while(n) {
+ *((volatile u8 *)p) = c;
+ p++;
+ n--;
+ }
+ __asm__ __volatile__ ("sync" : : : "memory");
+}
+EXPORT_SYMBOL(_memset_io);
+
+void _memcpy_fromio(void *dest, const volatile void __iomem *src,
+ unsigned long n)
+{
+ void *vsrc = (void __force *) src;
+
+ __asm__ __volatile__ ("sync" : : : "memory");
+ while(n && (!IO_CHECK_ALIGN(vsrc, 4) || !IO_CHECK_ALIGN(dest, 4))) {
+ *((u8 *)dest) = *((volatile u8 *)vsrc);
+ eieio();
+ vsrc++;
+ dest++;
+ n--;
+ }
+ while(n >= 4) {
+ *((u32 *)dest) = *((volatile u32 *)vsrc);
+ eieio();
+ vsrc += 4;
+ dest += 4;
+ n -= 4;
+ }
+ while(n) {
+ *((u8 *)dest) = *((volatile u8 *)vsrc);
+ eieio();
+ vsrc++;
+ dest++;
+ n--;
+ }
+ __asm__ __volatile__ ("sync" : : : "memory");
+}
+EXPORT_SYMBOL(_memcpy_fromio);
+
+void _memcpy_toio(volatile void __iomem *dest, const void *src, unsigned long n)
+{
+ void *vdest = (void __force *) dest;
+
+ __asm__ __volatile__ ("sync" : : : "memory");
+ while(n && (!IO_CHECK_ALIGN(vdest, 4) || !IO_CHECK_ALIGN(src, 4))) {
+ *((volatile u8 *)vdest) = *((u8 *)src);
+ src++;
+ vdest++;
+ n--;
+ }
+ while(n >= 4) {
+ *((volatile u32 *)vdest) = *((volatile u32 *)src);
+ src += 4;
+ vdest += 4;
+ n-=4;
+ }
+ while(n) {
+ *((volatile u8 *)vdest) = *((u8 *)src);
+ src++;
+ vdest++;
+ n--;
+ }
+ __asm__ __volatile__ ("sync" : : : "memory");
+}
+EXPORT_SYMBOL(_memcpy_toio);