The indriect CSR requires multiple instructions to read/write CSR. Add a few helper functions for ease of usage. Signed-off-by: Atish Patra <atishp@xxxxxxxxxxxx> --- arch/riscv/include/asm/csr_ind.h | 42 ++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 arch/riscv/include/asm/csr_ind.h diff --git a/arch/riscv/include/asm/csr_ind.h b/arch/riscv/include/asm/csr_ind.h new file mode 100644 index 000000000000..9611c221eb6f --- /dev/null +++ b/arch/riscv/include/asm/csr_ind.h @@ -0,0 +1,42 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2024 Rivos Inc. + */ + +#ifndef _ASM_RISCV_CSR_IND_H +#define _ASM_RISCV_CSR_IND_H + +#include <asm/csr.h> + +#define csr_ind_read(iregcsr, iselbase, iseloff) ({ \ + unsigned long value = 0; \ + unsigned long flags; \ + local_irq_save(flags); \ + csr_write(CSR_ISELECT, iselbase + iseloff); \ + value = csr_read(iregcsr); \ + local_irq_restore(flags); \ + value; \ +}) + +#define csr_ind_write(iregcsr, iselbase, iseloff, value) ({ \ + unsigned long flags; \ + local_irq_save(flags); \ + csr_write(CSR_ISELECT, iselbase + iseloff); \ + csr_write(iregcsr, value); \ + local_irq_restore(flags); \ +}) + +#define csr_ind_warl(iregcsr, iselbase, iseloff, warl_val) ({ \ + unsigned long old_val = 0, value = 0; \ + unsigned long flags; \ + local_irq_save(flags); \ + csr_write(CSR_ISELECT, iselbase + iseloff); \ + old_val = csr_read(iregcsr); \ + csr_write(iregcsr, value); \ + value = csr_read(iregcsr); \ + csr_write(iregcsr, old_val); \ + local_irq_restore(flags); \ + value; \ +}) + +#endif -- 2.34.1