sh: Optimized readsl()/writesl() support.

Implement optimized copies of readsl()/writesl().
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/sh/kernel/io.c

@@ -61,6 +61,73 @@ void memset_io(volatile void __iomem *dst, int c, unsigned long count)
 }
 EXPORT_SYMBOL(memset_io);
 
+void __raw_readsl(unsigned long addr, void *datap, int len)
+{
+	u32 *data;
+
+	for (data = datap; (len != 0) && (((u32)data & 0x1f) != 0); len--)
+		*data++ = ctrl_inl(addr);
+
+	if (likely(len >= (0x20 >> 2))) {
+		int tmp2, tmp3, tmp4, tmp5, tmp6;
+
+		__asm__ __volatile__(
+			"1:			\n\t"
+			"mov.l	@%7, r0		\n\t"
+			"mov.l	@%7, %2		\n\t"
+#ifdef CONFIG_CPU_SH4
+			"movca.l r0, @%0	\n\t"
+#else
+			"mov.l	r0, @%0		\n\t"
+#endif
+			"mov.l	@%7, %3		\n\t"
+			"mov.l	@%7, %4		\n\t"
+			"mov.l	@%7, %5		\n\t"
+			"mov.l	@%7, %6		\n\t"
+			"mov.l	@%7, r7		\n\t"
+			"mov.l	@%7, r0		\n\t"
+			"mov.l	%2, @(0x04,%0)	\n\t"
+			"mov	#0x20>>2, %2	\n\t"
+			"mov.l	%3, @(0x08,%0)	\n\t"
+			"sub	%2, %1		\n\t"
+			"mov.l	%4, @(0x0c,%0)	\n\t"
+			"cmp/hi	%1, %2		! T if 32 > len	\n\t"
+			"mov.l	%5, @(0x10,%0)	\n\t"
+			"mov.l	%6, @(0x14,%0)	\n\t"
+			"mov.l	r7, @(0x18,%0)	\n\t"
+			"mov.l	r0, @(0x1c,%0)	\n\t"
+			"bf.s	1b		\n\t"
+			" add	#0x20, %0	\n\t"
+			: "=&r" (data), "=&r" (len),
+			  "=&r" (tmp2), "=&r" (tmp3), "=&r" (tmp4),
+			  "=&r" (tmp5), "=&r" (tmp6)
+			: "r"(addr), "0" (data), "1" (len)
+			: "r0", "r7", "t", "memory");
+	}
+
+	for (; len != 0; len--)
+		*data++ = ctrl_inl(addr);
+}
+EXPORT_SYMBOL(__raw_readsl);
+
+void __raw_writesl(unsigned long addr, const void *data, int len)
+{
+	if (likely(len != 0)) {
+		int tmp1;
+
+		__asm__ __volatile__ (
+			"1:				\n\t"
+			"mov.l	@%0+, %1	\n\t"
+			"dt		%3		\n\t"
+			"bf.s		1b		\n\t"
+			" mov.l	%1, @%4		\n\t"
+			: "=&r" (data), "=&r" (tmp1)
+			: "0" (data), "r" (len), "r"(addr)
+			: "t", "memory");
+	}
+}
+EXPORT_SYMBOL(__raw_writesl);
+
 void __iomem *ioport_map(unsigned long port, unsigned int nr)
 {
 	return sh_mv.mv_ioport_map(port, nr);

include/asm-sh/io.h

@@ -107,6 +107,9 @@
 #define __raw_writew(v, a)	__writew(v, (void __iomem *)(a))
 #define __raw_writel(v, a)	__writel(v, (void __iomem *)(a))
 
+void __raw_writesl(unsigned long addr, const void *data, int longlen);
+void __raw_readsl(unsigned long addr, void *data, int longlen);
+
 /*
  * The platform header files may define some of these macros to use
  * the inlined versions where appropriate.  These macros may also be
@@ -132,6 +135,9 @@
 # define writel(v,a)	({ __raw_writel((v),(a)); mb(); })
 #endif
 
+#define writesl __raw_writesl
+#define readsl  __raw_readsl
+
 #define readb_relaxed(a) readb(a)
 #define readw_relaxed(a) readw(a)
 #define readl_relaxed(a) readl(a)