[PATCH v5 4/7] MIPS: Loongson64: Add Loongson-2K1000 early_printk_port

Qing Zhang
2021-03-15T07:51:12Z

Distinguish between Loongson-3A series CPU and Loongson-2K1000 CPU UART0.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Qing Zhang <zhangqing@loongson.cn>
Tested-by: Ming Wang <wangming01@loongson.cn>
---

v4-v5:
- No change

arch/mips/loongson64/init.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/mips/loongson64/init.c b/arch/mips/loongson64/init.c
index ed280b73bf89..d5a1eddb8202 100644
--- a/arch/mips/loongson64/init.c
+++ b/arch/mips/loongson64/init.c
@@ -120,7 +120,10 @@ void __init prom_init(void)
#endif

/* Hardcode to CPU UART 0 */
- setup_8250_early_printk_port(TO_UNCAC(LOONGSON_REG_BASE + 0x1e0), 0, 1024);
+ if ((read_c0_prid() & PRID_IMP_MASK) == PRID_IMP_LOONGSON_64R)
+ setup_8250_early_printk_port(TO_UNCAC(LOONGSON_REG_BASE), 0, 1024);
+ else
+ setup_8250_early_printk_port(TO_UNCAC(LOONGSON_REG_BASE + 0x1e0), 0, 1024);

register_smp_ops(&loongson3_smp_ops);
board_nmi_handler_setup = mips_nmi_setup;
--
2.20.1