diff options
| author | Rick Chen <rick@andestech.com> | 2018-11-07 09:34:06 +0800 |
|---|---|---|
| committer | Andes <uboot@andestech.com> | 2018-11-26 13:58:01 +0800 |
| commit | 52923c6db7f00e0197ec894c8c1bb8a7681974bb (patch) | |
| tree | 903fe89d39120e2cfaf553f8cdfe0aeb2b5b106c /arch/riscv/cpu/ax25/cache.c | |
| parent | bae2d72507abe8e17bdac30027c8748d22721024 (diff) | |
riscv: cache: Implement i/dcache [status, enable, disable]
AndeStar RISC-V(V5) provide mcache_ctl register which
can configure I/D cache as enabled or disabled.
This CSR will be encapsulated by CONFIG_RISCV_NDS.
If you want to configure cache on AndeStar V5
AE350 platform. YOu can enable [*] AndeStar V5 ISA support
by make menuconfig.
This approach also provide the expansion when the
vender specific features are going to join in.
Signed-off-by: Rick Chen <rick@andestech.com>
Cc: Greentime Hu <greentime@andestech.com>
Diffstat (limited to 'arch/riscv/cpu/ax25/cache.c')
| -rw-r--r-- | arch/riscv/cpu/ax25/cache.c | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/arch/riscv/cpu/ax25/cache.c b/arch/riscv/cpu/ax25/cache.c new file mode 100644 index 0000000000..6600ac2fac --- /dev/null +++ b/arch/riscv/cpu/ax25/cache.c @@ -0,0 +1,95 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2017 Andes Technology Corporation + * Rick Chen, Andes Technology Corporation <rick@andestech.com> + */ + +#include <common.h> + +void icache_enable(void) +{ +#ifndef CONFIG_SYS_ICACHE_OFF +#ifdef CONFIG_RISCV_NDS + asm volatile ( + "csrr t1, mcache_ctl\n\t" + "ori t0, t1, 0x1\n\t" + "csrw mcache_ctl, t0\n\t" + ); +#endif +#endif +} + +void icache_disable(void) +{ +#ifndef CONFIG_SYS_ICACHE_OFF +#ifdef CONFIG_RISCV_NDS + asm volatile ( + "fence.i\n\t" + "csrr t1, mcache_ctl\n\t" + "andi t0, t1, ~0x1\n\t" + "csrw mcache_ctl, t0\n\t" + ); +#endif +#endif +} + +void dcache_enable(void) +{ +#ifndef CONFIG_SYS_DCACHE_OFF +#ifdef CONFIG_RISCV_NDS + asm volatile ( + "csrr t1, mcache_ctl\n\t" + "ori t0, t1, 0x2\n\t" + "csrw mcache_ctl, t0\n\t" + ); +#endif +#endif +} + +void dcache_disable(void) +{ +#ifndef CONFIG_SYS_DCACHE_OFF +#ifdef CONFIG_RISCV_NDS + asm volatile ( + "fence\n\t" + "csrr t1, mcache_ctl\n\t" + "andi t0, t1, ~0x2\n\t" + "csrw mcache_ctl, t0\n\t" + ); +#endif +#endif +} + +int icache_status(void) +{ + int ret = 0; + +#ifdef CONFIG_RISCV_NDS + asm volatile ( + "csrr t1, mcache_ctl\n\t" + "andi %0, t1, 0x01\n\t" + : "=r" (ret) + : + : "memory" + ); +#endif + + return ret; +} + +int dcache_status(void) +{ + int ret = 0; + +#ifdef CONFIG_RISCV_NDS + asm volatile ( + "csrr t1, mcache_ctl\n\t" + "andi %0, t1, 0x02\n\t" + : "=r" (ret) + : + : "memory" + ); +#endif + + return ret; +} |