Initial commit.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

1 files changed, 109 insertions, 0 deletions

diff --git a/include/sbi/riscv_io.h b/include/sbi/riscv_io.h
new file mode 100644
index 0000000..08f1a2f
--- /dev/null
+++ b/include/sbi/riscv_io.h
@@ -0,0 +1,109 @@
+/*
+ * Copyright (c) 2018 Western Digital Corporation or its affiliates.
+ *
+ * Authors:
+ *   Anup Patel <anup.patel@wdc.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#ifndef __RISCV_IO_H__
+#define __RISCV_IO_H__
+
+#include <sbi/riscv_barrier.h>
+#include <sbi/sbi_types.h>
+
+static inline void __raw_writeb(u8 val, volatile void *addr)
+{
+	asm volatile("sb %0, 0(%1)" : : "r" (val), "r" (addr));
+}
+
+static inline void __raw_writew(u16 val, volatile void *addr)
+{
+	asm volatile("sh %0, 0(%1)" : : "r" (val), "r" (addr));
+}
+
+static inline void __raw_writel(u32 val, volatile void *addr)
+{
+	asm volatile("sw %0, 0(%1)" : : "r" (val), "r" (addr));
+}
+
+#if __riscv_xlen != 32
+static inline void __raw_writeq(u64 val, volatile void *addr)
+{
+	asm volatile("sd %0, 0(%1)" : : "r" (val), "r" (addr));
+}
+#endif
+
+static inline u8 __raw_readb(const volatile void *addr)
+{
+	u8 val;
+
+	asm volatile("lb %0, 0(%1)" : "=r" (val) : "r" (addr));
+	return val;
+}
+
+static inline u16 __raw_readw(const volatile void *addr)
+{
+	u16 val;
+
+	asm volatile("lh %0, 0(%1)" : "=r" (val) : "r" (addr));
+	return val;
+}
+
+static inline u32 __raw_readl(const volatile void *addr)
+{
+	u32 val;
+
+	asm volatile("lw %0, 0(%1)" : "=r" (val) : "r" (addr));
+	return val;
+}
+
+#if __riscv_xlen != 32
+static inline u64 __raw_readq(const volatile void *addr)
+{
+	u64 val;
+
+	asm volatile("ld %0, 0(%1)" : "=r" (val) : "r" (addr));
+	return val;
+}
+#endif
+
+/* FIXME: These are now the same as asm-generic */
+#define __io_rbr()		do {} while (0)
+#define __io_rar()		do {} while (0)
+#define __io_rbw()		do {} while (0)
+#define __io_raw()		do {} while (0)
+
+#define readb_relaxed(c)	({ u8  __v; __io_rbr(); __v = __raw_readb(c); __io_rar(); __v; })
+#define readw_relaxed(c)	({ u16 __v; __io_rbr(); __v = __raw_readw(c); __io_rar(); __v; })
+#define readl_relaxed(c)	({ u32 __v; __io_rbr(); __v = __raw_readl(c); __io_rar(); __v; })
+
+#define writeb_relaxed(v,c)	({ __io_rbw(); __raw_writeb((v),(c)); __io_raw(); })
+#define writew_relaxed(v,c)	({ __io_rbw(); __raw_writew((v),(c)); __io_raw(); })
+#define writel_relaxed(v,c)	({ __io_rbw(); __raw_writel((v),(c)); __io_raw(); })
+
+#if __riscv_xlen != 32
+#define readq_relaxed(c)	({ u64 __v; __io_rbr(); __v = __raw_readq(c); __io_rar(); __v; })
+#define writeq_relaxed(v,c)	({ __io_rbw(); __raw_writeq((v),(c)); __io_raw(); })
+#endif
+
+#define __io_br()	do {} while (0)
+#define __io_ar()	__asm__ __volatile__ ("fence i,r" : : : "memory");
+#define __io_bw()	__asm__ __volatile__ ("fence w,o" : : : "memory");
+#define __io_aw()	do {} while (0)
+
+#define readb(c)	({ u8  __v; __io_br(); __v = __raw_readb(c); __io_ar(); __v; })
+#define readw(c)	({ u16 __v; __io_br(); __v = __raw_readw(c); __io_ar(); __v; })
+#define readl(c)	({ u32 __v; __io_br(); __v = __raw_readl(c); __io_ar(); __v; })
+
+#define writeb(v,c)	({ __io_bw(); __raw_writeb((v),(c)); __io_aw(); })
+#define writew(v,c)	({ __io_bw(); __raw_writew((v),(c)); __io_aw(); })
+#define writel(v,c)	({ __io_bw(); __raw_writel((v),(c)); __io_aw(); })
+
+#if __riscv_xlen != 32
+#define readq(c)	({ u64 __v; __io_br(); __v = __raw_readq(c); __io_ar(); __v; })
+#define writeq(v,c)	({ __io_bw(); __raw_writeq((v),(c)); __io_aw(); })
+#endif
+
+#endif