This patch improves the cache enabling operation in harts_early_init(), also moves the CSR definition to include/asm/arch-andes/csr.h and drops unnecessary i/d-cache disable functions from cleanup_before_linux().

Signed-off-by: Yu Chien Peter Lin peterlin@andestech.com Reviewed-by: Leo Yu-Chi Liang ycliang@andestech.com --- Changes v1 -> v2 * Combine the raised bits of mcache_ctl (suggested by Leo [1]) * Improve the comment

[1] https://patchwork.ozlabs.org/project/uboot/patch/20230119070544.7423-6-peter... --- arch/riscv/cpu/ax25/cpu.c | 45 +++++++------------------ arch/riscv/include/asm/arch-andes/csr.h | 29 ++++++++++++++++ 2 files changed, 41 insertions(+), 33 deletions(-) create mode 100644 arch/riscv/include/asm/arch-andes/csr.h

diff --git a/arch/riscv/cpu/ax25/cpu.c b/arch/riscv/cpu/ax25/cpu.c index c4c2de2ef0..8cc5e224a0 100644 --- a/arch/riscv/cpu/ax25/cpu.c +++ b/arch/riscv/cpu/ax25/cpu.c @@ -1,6 +1,6 @@ // SPDX-License-Identifier: GPL-2.0+ /* - * Copyright (C) 2017 Andes Technology Corporation + * Copyright (C) 2023 Andes Technology Corporation * Rick Chen, Andes Technology Corporation rick@andestech.com */

@@ -10,21 +10,7 @@ #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) - +#include <asm/arch-andes/csr.h>

/* * cleanup_before_linux() is called just before we call linux @@ -36,36 +22,29 @@ int cleanup_before_linux(void) { disable_interrupts();

- /* turn off I/D-cache */ cache_flush(); - icache_disable(); - dcache_disable();

return 0; }

void harts_early_init(void) { + /* Enable I/D-cache in SPL */ if (CONFIG_IS_ENABLED(RISCV_MMODE)) { - unsigned long long mcache_ctl_val = csr_read(CSR_MCACHE_CTL); + unsigned long mcache_ctl_val = csr_read(CSR_MCACHE_CTL); + + mcache_ctl_val |= (MCACHE_CTL_DC_COHEN | MCACHE_CTL_IC_EN | + MCACHE_CTL_DC_EN);

- 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 + * Check mcache_ctl.DC_COHEN, we assume this platform does + * not support CM if the bit is hard-wired 0. */ - 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); + if (csr_read(CSR_MCACHE_CTL) & MCACHE_CTL_DC_COHEN) { + /* Wait for DC_COHSTA bit to be set */ + while (!(csr_read(CSR_MCACHE_CTL) & MCACHE_CTL_DC_COHSTA)); } } } diff --git a/arch/riscv/include/asm/arch-andes/csr.h b/arch/riscv/include/asm/arch-andes/csr.h new file mode 100644 index 0000000000..a03ccd5b3e --- /dev/null +++ b/arch/riscv/include/asm/arch-andes/csr.h @@ -0,0 +1,29 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2023 Andes Technology Corporation + */ + +#ifndef _ASM_ANDES_CSR_H +#define _ASM_ANDES_CSR_H + +#include <asm/asm.h> +#include <linux/const.h> + +#define CSR_MCACHE_CTL 0x7ca +#define CSR_MMISC_CTL 0x7d0 +#define CSR_MARCHID 0xf12 +#define CSR_MCCTLCOMMAND 0x7cc + +#define MCACHE_CTL_IC_EN_OFFSET 0 +#define MCACHE_CTL_DC_EN_OFFSET 1 +#define MCACHE_CTL_DC_COHEN_OFFSET 19 +#define MCACHE_CTL_DC_COHSTA_OFFSET 20 + +#define MCACHE_CTL_IC_EN BIT(MCACHE_CTL_IC_EN_OFFSET) +#define MCACHE_CTL_DC_EN BIT(MCACHE_CTL_DC_EN_OFFSET) +#define MCACHE_CTL_DC_COHEN BIT(MCACHE_CTL_DC_COHEN_OFFSET) +#define MCACHE_CTL_DC_COHSTA BIT(MCACHE_CTL_DC_COHSTA_OFFSET) + +#define CCTL_L1D_WBINVAL_ALL 6 + +#endif /* _ASM_ANDES_CSR_H */