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Diffstat (limited to 'arch/arm/include/asm/arch-mx28/regs-common.h')
| -rw-r--r-- | arch/arm/include/asm/arch-mx28/regs-common.h | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/arch/arm/include/asm/arch-mx28/regs-common.h b/arch/arm/include/asm/arch-mx28/regs-common.h new file mode 100644 index 0000000000..efe975b4bb --- /dev/null +++ b/arch/arm/include/asm/arch-mx28/regs-common.h @@ -0,0 +1,66 @@ +/* + * Freescale i.MX28 Register Accessors + * + * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com> + * on behalf of DENX Software Engineering GmbH + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#ifndef __MX28_REGS_COMMON_H__ +#define __MX28_REGS_COMMON_H__ + +/* + * The i.MX28 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 __mx28_reg(name) \ + uint32_t name; \ + uint32_t name##_set; \ + uint32_t name##_clr; \ + uint32_t name##_tog; + +struct mx28_register { + __mx28_reg(reg) +}; + +#define mx28_reg(name) \ + union { \ + struct { __mx28_reg(name) }; \ + struct mx28_register name##_reg; \ + }; + +#endif /* __MX28_REGS_COMMON_H__ */ |
