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- /* SPDX-License-Identifier: GPL-2.0+ */
- /*
- * Freescale i.MXS Register Accessors
- *
- * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
- * on behalf of DENX Software Engineering GmbH
- */
- #ifndef __MXS_REGS_COMMON_H__
- #define __MXS_REGS_COMMON_H__
- #include <linux/types.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__ */
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