If Coherence Manager were not set in the beginning, u-boot-spl would sometimes fail to boot to u-boot proper.
Enable CM and I/D cache at the same time in harts_early_init
Signed-off-by: Leo Yu-Chi Liang ycliang@andestech.com --- arch/riscv/cpu/ax25/cpu.c | 42 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+)
diff --git a/arch/riscv/cpu/ax25/cpu.c b/arch/riscv/cpu/ax25/cpu.c index f092600e14..c4c2de2ef0 100644 --- a/arch/riscv/cpu/ax25/cpu.c +++ b/arch/riscv/cpu/ax25/cpu.c @@ -9,6 +9,22 @@ #include <cpu_func.h> #include <irq_func.h> #include <asm/cache.h> +#include <asm/csr.h> + +#define CSR_MCACHE_CTL 0x7ca +#define CSR_MMISC_CTL 0x7d0 +#define CSR_MARCHID 0xf12 + +#define V5_MCACHE_CTL_IC_EN_OFFSET 0 +#define V5_MCACHE_CTL_DC_EN_OFFSET 1 +#define V5_MCACHE_CTL_DC_COHEN_OFFSET 19 +#define V5_MCACHE_CTL_DC_COHSTA_OFFSET 20 + +#define V5_MCACHE_CTL_IC_EN BIT(V5_MCACHE_CTL_IC_EN_OFFSET) +#define V5_MCACHE_CTL_DC_EN BIT(V5_MCACHE_CTL_DC_EN_OFFSET) +#define V5_MCACHE_CTL_DC_COHEN_EN BIT(V5_MCACHE_CTL_DC_COHEN_OFFSET) +#define V5_MCACHE_CTL_DC_COHSTA_EN BIT(V5_MCACHE_CTL_DC_COHSTA_OFFSET) +
/* * cleanup_before_linux() is called just before we call linux @@ -27,3 +43,29 @@ int cleanup_before_linux(void)
return 0; } + +void harts_early_init(void) +{ + if (CONFIG_IS_ENABLED(RISCV_MMODE)) { + unsigned long long mcache_ctl_val = csr_read(CSR_MCACHE_CTL); + + if (!(mcache_ctl_val & V5_MCACHE_CTL_DC_COHEN_EN)) + mcache_ctl_val |= V5_MCACHE_CTL_DC_COHEN_EN; + if (!(mcache_ctl_val & V5_MCACHE_CTL_IC_EN)) + mcache_ctl_val |= V5_MCACHE_CTL_IC_EN; + if (!(mcache_ctl_val & V5_MCACHE_CTL_DC_EN)) + mcache_ctl_val |= V5_MCACHE_CTL_DC_EN; + csr_write(CSR_MCACHE_CTL, mcache_ctl_val); + + /* + * Check DC_COHEN_EN, if cannot write to mcache_ctl, + * we assume this bitmap not support L2 CM + */ + mcache_ctl_val = csr_read(CSR_MCACHE_CTL); + if ((mcache_ctl_val & V5_MCACHE_CTL_DC_COHEN_EN)) { + /* Wait for DC_COHSTA bit be set */ + while (!(mcache_ctl_val & V5_MCACHE_CTL_DC_COHSTA_EN)) + mcache_ctl_val = csr_read(CSR_MCACHE_CTL); + } + } +}