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