Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
84 lines
2.1 KiB
C
84 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Common LiteX header providing
|
|
* helper functions for accessing CSRs.
|
|
*
|
|
* Copyright (C) 2019-2020 Antmicro <www.antmicro.com>
|
|
*/
|
|
|
|
#ifndef _LINUX_LITEX_H
|
|
#define _LINUX_LITEX_H
|
|
|
|
#include <linux/io.h>
|
|
|
|
static inline void _write_litex_subregister(u32 val, void __iomem *addr)
|
|
{
|
|
writel((u32 __force)cpu_to_le32(val), addr);
|
|
}
|
|
|
|
static inline u32 _read_litex_subregister(void __iomem *addr)
|
|
{
|
|
return le32_to_cpu((__le32 __force)readl(addr));
|
|
}
|
|
|
|
/*
|
|
* LiteX SoC Generator, depending on the configuration, can split a single
|
|
* logical CSR (Control&Status Register) into a series of consecutive physical
|
|
* registers.
|
|
*
|
|
* For example, in the configuration with 8-bit CSR Bus, a 32-bit aligned,
|
|
* 32-bit wide logical CSR will be laid out as four 32-bit physical
|
|
* subregisters, each one containing one byte of meaningful data.
|
|
*
|
|
* For Linux support, upstream LiteX enforces a 32-bit wide CSR bus, which
|
|
* means that only larger-than-32-bit CSRs will be split across multiple
|
|
* subregisters (e.g., a 64-bit CSR will be spread across two consecutive
|
|
* 32-bit subregisters).
|
|
*
|
|
* For details see: https://github.com/enjoy-digital/litex/wiki/CSR-Bus
|
|
*/
|
|
|
|
static inline void litex_write8(void __iomem *reg, u8 val)
|
|
{
|
|
_write_litex_subregister(val, reg);
|
|
}
|
|
|
|
static inline void litex_write16(void __iomem *reg, u16 val)
|
|
{
|
|
_write_litex_subregister(val, reg);
|
|
}
|
|
|
|
static inline void litex_write32(void __iomem *reg, u32 val)
|
|
{
|
|
_write_litex_subregister(val, reg);
|
|
}
|
|
|
|
static inline void litex_write64(void __iomem *reg, u64 val)
|
|
{
|
|
_write_litex_subregister(val >> 32, reg);
|
|
_write_litex_subregister(val, reg + 4);
|
|
}
|
|
|
|
static inline u8 litex_read8(void __iomem *reg)
|
|
{
|
|
return _read_litex_subregister(reg);
|
|
}
|
|
|
|
static inline u16 litex_read16(void __iomem *reg)
|
|
{
|
|
return _read_litex_subregister(reg);
|
|
}
|
|
|
|
static inline u32 litex_read32(void __iomem *reg)
|
|
{
|
|
return _read_litex_subregister(reg);
|
|
}
|
|
|
|
static inline u64 litex_read64(void __iomem *reg)
|
|
{
|
|
return ((u64)_read_litex_subregister(reg) << 32) |
|
|
_read_litex_subregister(reg + 4);
|
|
}
|
|
|
|
#endif /* _LINUX_LITEX_H */
|