From 3dbff9eecc869bc28ce010cf97d2cfee25c44f3a Mon Sep 17 00:00:00 2001 From: Yao Zi Date: Tue, 13 May 2025 09:04:54 +0000 Subject: riscv: lib: Split out support for T-Head cache management operations Designed before a standard set of cache management operations defined in RISC-V, earlier T-Head cores like C906 and C910 provide CMO through the customized extension XTheadCMO, which has been used in the CV1800B port of U-Boot. This patch splits XTheadCMO-related code into a generic module, allowing SoCs shipping T-Head cores to share the code. Link: https://github.com/XUANTIE-RV/thead-extension-spec Signed-off-by: Yao Zi Reviewed-by: Leo Yu-Chi Liang --- arch/riscv/lib/thead_cmo.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 arch/riscv/lib/thead_cmo.c (limited to 'arch/riscv/lib/thead_cmo.c') diff --git a/arch/riscv/lib/thead_cmo.c b/arch/riscv/lib/thead_cmo.c new file mode 100644 index 00000000000..b8051e29e02 --- /dev/null +++ b/arch/riscv/lib/thead_cmo.c @@ -0,0 +1,45 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (c) 2024, Kongyang Liu + */ + +#include + +/* + * dcache.ipa rs1 (invalidate) + * | 31 - 25 | 24 - 20 | 19 - 15 | 14 - 12 | 11 - 7 | 6 - 0 | + * 0000001 01010 rs1 000 00000 0001011 + * + * dcache.cpa rs1 (clean) + * | 31 - 25 | 24 - 20 | 19 - 15 | 14 - 12 | 11 - 7 | 6 - 0 | + * 0000001 01001 rs1 000 00000 0001011 + * + * dcache.cipa rs1 (clean then invalidate) + * | 31 - 25 | 24 - 20 | 19 - 15 | 14 - 12 | 11 - 7 | 6 - 0 | + * 0000001 01011 rs1 000 00000 0001011 + * + * sync.s + * | 31 - 25 | 24 - 20 | 19 - 15 | 14 - 12 | 11 - 7 | 6 - 0 | + * 0000000 11001 00000 000 00000 0001011 + */ +#define DCACHE_IPA_A0 ".long 0x02a5000b" +#define DCACHE_CPA_A0 ".long 0x0295000b" +#define DCACHE_CIPA_A0 ".long 0x02b5000b" + +#define SYNC_S ".long 0x0190000b" + +void invalidate_dcache_range(unsigned long start, unsigned long end) +{ + register unsigned long i asm("a0") = start & ~(CONFIG_SYS_CACHELINE_SIZE - 1); + for (; i < end; i += CONFIG_SYS_CACHELINE_SIZE) + __asm__ __volatile__(DCACHE_IPA_A0); + __asm__ __volatile__(SYNC_S); +} + +void flush_dcache_range(unsigned long start, unsigned long end) +{ + register unsigned long i asm("a0") = start & ~(CONFIG_SYS_CACHELINE_SIZE - 1); + for (; i < end; i += CONFIG_SYS_CACHELINE_SIZE) + __asm__ __volatile__(DCACHE_CPA_A0); + __asm__ __volatile__(SYNC_S); +} -- cgit v1.2.3