1 files changed, 69 insertions, 0 deletions
diff --git a/roms/u-boot/arch/arm/include/asm/imx-common/regs-common.h b/roms/u-boot/arch/arm/include/asm/imx-common/regs-common.h
new file mode 100644
index 00000000..e54a220f
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+++ b/roms/u-boot/arch/arm/include/asm/imx-common/regs-common.h
@@ -0,0 +1,69 @@
+/*
+ * Freescale i.MXS Register Accessors
+ *
+ * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
+ * on behalf of DENX Software Engineering GmbH
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __MXS_REGS_COMMON_H__
+#define __MXS_REGS_COMMON_H__
+
+/*
+ * The i.MXS has interesting feature when it comes to register access. There
+ * are four kinds of access to one particular register. Those are:
+ *
+ * 1) Common read/write access. To use this mode, just write to the address of
+ *    the register.
+ * 2) Set bits only access. To set bits, write which bits you want to set to the
+ *    address of the register + 0x4.
+ * 3) Clear bits only access. To clear bits, write which bits you want to clear
+ *    to the address of the register + 0x8.
+ * 4) Toggle bits only access. To toggle bits, write which bits you want to
+ *    toggle to the address of the register + 0xc.
+ *
+ * IMPORTANT NOTE: Not all registers support accesses 2-4! Also, not all bits
+ * can be set/cleared by pure write as in access type 1, some need to be
+ * explicitly set/cleared by using access type 2-3.
+ *
+ * The following macros and structures allow the user to either access the
+ * register in all aforementioned modes (by accessing reg_name, reg_name_set,
+ * reg_name_clr, reg_name_tog) or pass the register structure further into
+ * various functions with correct type information (by accessing reg_name_reg).
+ *
+ */
+
+#define	__mxs_reg_8(name)		\
+	uint8_t	name[4];		\
+	uint8_t	name##_set[4];		\
+	uint8_t	name##_clr[4];		\
+	uint8_t	name##_tog[4];		\
+
+#define	__mxs_reg_32(name)		\
+	uint32_t name;			\
+	uint32_t name##_set;		\
+	uint32_t name##_clr;		\
+	uint32_t name##_tog;
+
+struct mxs_register_8 {
+	__mxs_reg_8(reg)
+};
+
+struct mxs_register_32 {
+	__mxs_reg_32(reg)
+};
+
+#define	mxs_reg_8(name)				\
+	union {						\
+		struct { __mxs_reg_8(name) };		\
+		struct mxs_register_8 name##_reg;	\
+	};
+
+#define	mxs_reg_32(name)				\
+	union {						\
+		struct { __mxs_reg_32(name) };		\
+		struct mxs_register_32 name##_reg;	\
+	};
+
+#endif	/* __MXS_REGS_COMMON_H__ */