[PATCH] riscv: andes_plic.c: use modified IPI scheme

[PATCH] riscv: andes_plic.c: use modified IPI scheme

[Yu Chien Peter Lin]

The IPI scheme in OpenSBI has been updated to support 8-core AE350
platform, the plicsw configuration needs to be modified accordingly.

Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com>
---
 arch/riscv/lib/andes_plic.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/riscv/lib/andes_plic.c b/arch/riscv/lib/andes_plic.c
index 5e113ee8c9..9fe2568a16 100644
--- a/arch/riscv/lib/andes_plic.c
+++ b/arch/riscv/lib/andes_plic.c
@@ -27,17 +27,18 @@
 /* claim register */
 #define CLAIM_REG(base, hart)	((ulong)(base) + 0x200004 + (hart) * 0x1000)
 
-#define ENABLE_HART_IPI         (0x80808080)
-#define SEND_IPI_TO_HART(hart)  (0x80 >> (hart))
+#define ENABLE_HART_IPI         (0x01010101)
+#define SEND_IPI_TO_HART(hart)  (0x1 << (hart))
 
 DECLARE_GLOBAL_DATA_PTR;
 
-static int enable_ipi(int hart)
+int enable_ipi(int hart)
 {
 	unsigned int en;
 
-	en = ENABLE_HART_IPI >> hart;
+	en = ENABLE_HART_IPI << hart;
 	writel(en, (void __iomem *)ENABLE_REG(gd->arch.plic, hart));
+	writel(en, (void __iomem *)ENABLE_REG(gd->arch.plic + 0x4, hart));
 
 	return 0;
 }
-- 
2.34.1

Re: [PATCH] riscv: andes_plic.c: use modified IPI scheme

[Rick Chen]

> From: Peter Yu-Chien Lin(林宇謙) <peterlin@andestech.com>
> Sent: Friday, October 14, 2022 3:00 PM
> To: u-boot@lists.denx.de
> Cc: Leo Yu-Chi Liang(梁育齊) <ycliang@andestech.com>; Rick Jian-Zhi Chen(陳建志) <rick@andestech.com>; Peter Yu-Chien Lin(林宇謙) <peterlin@andestech.com>
> Subject: [PATCH] riscv: andes_plic.c: use modified IPI scheme
>
> The IPI scheme in OpenSBI has been updated to support 8-core AE350 platform, the plicsw configuration needs to be modified accordingly.
>
> Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com>
> ---
>  arch/riscv/lib/andes_plic.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)

Reviewed-by: Rick Chen <rick@andestech.com>