i2c: improve i2c architecture, add sifive i2c driver

kernel/arch/riscv64/src/sbi.rs

@@ -1,3 +1,4 @@
+use device_api::{ResetDevice, device::Device};
 use yggdrasil_abi::{error::Error, primitive_enum};
 
 const EXT_HSM: u64 = 0x48534D;
@@ -6,6 +7,7 @@ const EXT_DBCN: u64 = 0x4442434E;
 const EXT_SPI: u64 = 0x735049;
 const EXT_SYSTEM_SHUTDOWN: u64 = 0x53525354;
 const EXT_SYSTEM_SHUTDOWN_LEGACY: u64 = 0x08;
+const EXT_SYSTEM_RESET: u64 = 0x53525354;
 
 primitive_enum! {
     pub enum Status: i64 {
@@ -52,6 +54,20 @@ impl From<i64> for SbiError {
     }
 }
 
+pub struct SbiResetMethod;
+
+impl Device for SbiResetMethod {
+    fn display_name(&self) -> &str {
+        "SBI reset"
+    }
+}
+
+impl ResetDevice for SbiResetMethod {
+    unsafe fn reset(&self) -> ! {
+        sbi_system_reset()
+    }
+}
+
 #[allow(clippy::too_many_arguments)]
 #[inline(always)]
 unsafe fn sbi_do_call(
@@ -107,6 +123,11 @@ pub fn sbi_set_timer(next_event: u64) {
     unsafe { sbi_do_call(EXT_TIME, 0x00, next_event, 0, 0, 0, 0, 0) }.ok();
 }
 
+pub fn sbi_system_reset() -> ! {
+    unsafe { sbi_do_call(EXT_SYSTEM_RESET, 0x00, 0x01, 0x00, 0, 0, 0, 0) }.ok();
+    unreachable!()
+}
+
 pub fn sbi_system_shutdown() -> ! {
     unsafe { sbi_do_call(EXT_SYSTEM_SHUTDOWN, 0x00, 0, 0, 0, 0, 0, 0) }.ok();
     unsafe { sbi_do_call(EXT_SYSTEM_SHUTDOWN_LEGACY, 0x00, 0, 0, 0, 0, 0, 0) }.ok();