riscv: timer: Update the sifive clint timer driver to support aclint
This RISC-V ACLINT specification [1] defines a set of memory mapped
devices which provide inter-processor interrupts (IPI) and timer
functionalities for each HART on a multi-HART RISC-V platform.
The RISC-V ACLINT specification is defined to be backward compatible
with the SiFive CLINT specification, however the device tree binding
is a new one. This change updates the sifive clint timer driver to
support ACLINT mtimer device, using a per-driver data field to hold
the mtimer offset to the base address encoded in the mtimer node.
[1] https://github.com/riscv/riscv-aclint/blob/main/riscv-aclint.adoc
Signed-off-by: Bin Meng <bmeng@tinylab.org>
Reviewed-by: Rick Chen <rick@andestech.com>
diff --git a/include/configs/sifive-unleashed.h b/include/configs/sifive-unleashed.h
index de3a0dc..f208f5e 100644
--- a/include/configs/sifive-unleashed.h
+++ b/include/configs/sifive-unleashed.h
@@ -14,8 +14,8 @@
#define CFG_SYS_SDRAM_BASE 0x80000000
#define RISCV_MMODE_TIMERBASE 0x2000000
+#define RISCV_MMODE_TIMEROFF 0xbff8
#define RISCV_MMODE_TIMER_FREQ 1000000
-
#define RISCV_SMODE_TIMER_FREQ 1000000
/* Environment options */