diff options
| author | Rick Chen <rick@andestech.com> | 2019-08-28 18:46:11 +0800 |
|---|---|---|
| committer | Andes <uboot@andestech.com> | 2019-09-03 09:31:03 +0800 |
| commit | 61ce84b2cf1a6672c8e402ce8174554b25629692 (patch) | |
| tree | ea53c8fd1dd9bf65bc1d29dd9a0957d060dc1917 | |
| parent | cf6ee112d802bc378172cfa5db3a430509cc82d8 (diff) | |
| download | u-boot-61ce84b2cf1a6672c8e402ce8174554b25629692.tar.gz u-boot-61ce84b2cf1a6672c8e402ce8174554b25629692.tar.xz u-boot-61ce84b2cf1a6672c8e402ce8174554b25629692.zip | |
riscv: cache: use CCTL to flush d-cache
Use CCTL command to do d-cache write back
and invalidate instead of fence.
Signed-off-by: Rick Chen <rick@andestech.com>
Cc: KC Lin <kclin@andestech.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
| -rw-r--r-- | arch/riscv/cpu/ax25/cache.c | 22 |
1 files changed, 13 insertions, 9 deletions
diff --git a/arch/riscv/cpu/ax25/cache.c b/arch/riscv/cpu/ax25/cache.c index 8f5455e519..41de30cc02 100644 --- a/arch/riscv/cpu/ax25/cache.c +++ b/arch/riscv/cpu/ax25/cache.c @@ -8,17 +8,21 @@ #include <dm.h> #include <dm/uclass-internal.h> #include <cache.h> +#include <asm/csr.h> + +#ifdef CONFIG_RISCV_NDS_CACHE +/* mcctlcommand */ +#define CCTL_REG_MCCTLCOMMAND_NUM 0x7cc + +/* D-cache operation */ +#define CCTL_L1D_WBINVAL_ALL 6 +#endif void flush_dcache_all(void) { - /* - * Andes' AX25 does not have a coherence agent. U-Boot must use data - * cache flush and invalidate functions to keep data in the system - * coherent. - * The implementation of the fence instruction in the AX25 flushes the - * data cache and is used for this purpose. - */ - asm volatile ("fence" ::: "memory"); +#ifdef CONFIG_RISCV_NDS_CACHE + csr_write(CCTL_REG_MCCTLCOMMAND_NUM, CCTL_L1D_WBINVAL_ALL); +#endif } void flush_dcache_range(unsigned long start, unsigned long end) @@ -84,8 +88,8 @@ void dcache_disable(void) #ifdef CONFIG_RISCV_NDS_CACHE struct udevice *dev = NULL; + csr_write(CCTL_REG_MCCTLCOMMAND_NUM, CCTL_L1D_WBINVAL_ALL); asm volatile ( - "fence\n\t" "csrr t1, mcache_ctl\n\t" "andi t0, t1, ~0x2\n\t" "csrw mcache_ctl, t0\n\t" |