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https://github.com/brain-hackers/u-boot-brain
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
71 lines
2.0 KiB
C
71 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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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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#ifndef __MXS_REGS_COMMON_H__
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#define __MXS_REGS_COMMON_H__
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#include <linux/types.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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