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83 lines
2.1 KiB
83 lines
2.1 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* Common LiteX header providing |
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* helper functions for accessing CSRs. |
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* |
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* Copyright (C) 2019-2020 Antmicro <www.antmicro.com> |
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*/ |
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#ifndef _LINUX_LITEX_H |
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#define _LINUX_LITEX_H |
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#include <linux/io.h> |
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static inline void _write_litex_subregister(u32 val, void __iomem *addr) |
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{ |
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writel((u32 __force)cpu_to_le32(val), addr); |
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} |
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static inline u32 _read_litex_subregister(void __iomem *addr) |
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{ |
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return le32_to_cpu((__le32 __force)readl(addr)); |
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} |
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/* |
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* LiteX SoC Generator, depending on the configuration, can split a single |
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* logical CSR (Control&Status Register) into a series of consecutive physical |
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* registers. |
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* |
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* For example, in the configuration with 8-bit CSR Bus, a 32-bit aligned, |
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* 32-bit wide logical CSR will be laid out as four 32-bit physical |
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* subregisters, each one containing one byte of meaningful data. |
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* |
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* For Linux support, upstream LiteX enforces a 32-bit wide CSR bus, which |
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* means that only larger-than-32-bit CSRs will be split across multiple |
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* subregisters (e.g., a 64-bit CSR will be spread across two consecutive |
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* 32-bit subregisters). |
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* |
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* For details see: https://github.com/enjoy-digital/litex/wiki/CSR-Bus |
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*/ |
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static inline void litex_write8(void __iomem *reg, u8 val) |
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{ |
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_write_litex_subregister(val, reg); |
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} |
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static inline void litex_write16(void __iomem *reg, u16 val) |
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{ |
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_write_litex_subregister(val, reg); |
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} |
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static inline void litex_write32(void __iomem *reg, u32 val) |
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{ |
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_write_litex_subregister(val, reg); |
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} |
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static inline void litex_write64(void __iomem *reg, u64 val) |
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{ |
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_write_litex_subregister(val >> 32, reg); |
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_write_litex_subregister(val, reg + 4); |
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} |
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static inline u8 litex_read8(void __iomem *reg) |
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{ |
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return _read_litex_subregister(reg); |
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} |
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static inline u16 litex_read16(void __iomem *reg) |
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{ |
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return _read_litex_subregister(reg); |
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} |
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static inline u32 litex_read32(void __iomem *reg) |
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{ |
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return _read_litex_subregister(reg); |
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} |
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static inline u64 litex_read64(void __iomem *reg) |
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{ |
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return ((u64)_read_litex_subregister(reg) << 32) | |
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_read_litex_subregister(reg + 4); |
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} |
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#endif /* _LINUX_LITEX_H */
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