risc-v/k230: add big core support

Previously NuttX runs on little core of K230, this patch allows NuttX to
run on the big core as well.

Within folder `arch/risc-v/src/k230`:

- Changes:

    - CMakeLists.txt      add k230_hart.c to sources list
    - Make.defs           add k230_hart.c to sources list
    - chip.h              add inclusion to k230_hart.h etc
    - k230_irq.c          move sbi_late_init() to k230_hart.c
    - k230_start.c        add support to run on big core
    - hardware/:
      - k230_memorymap.h  add T-Head C908 specific CSR

- Additions:

    - k230_hart.c         sbi_late_init w/ hart initialization
    - k230_hart.h         header file

Signed-off-by: Yanfeng Liu <yfliu2008@qq.com>

arch/risc-v/src/k230/CMakeLists.txt

@@ -26,6 +26,7 @@ list(
   k230_start.c
   k230_irq_dispatch.c
   k230_irq.c
+  k230_hart.c
   k230_timerisr.c
   k230_allocateheap.c)
 

arch/risc-v/src/k230/Make.defs

@@ -24,7 +24,7 @@ CHIP_ASRCS += k230_head.S
 
 # Specify our C code within this directory to be included
 CHIP_CSRCS  = k230_start.c k230_irq_dispatch.c k230_irq.c
-CHIP_CSRCS += k230_timerisr.c k230_allocateheap.c
+CHIP_CSRCS += k230_timerisr.c k230_allocateheap.c k230_hart.c
 
 ifeq ($(CONFIG_BUILD_KERNEL),y)
 CHIP_CSRCS += k230_mm_init.c

arch/risc-v/src/k230/chip.h

@@ -30,9 +30,11 @@
 #include <arch/k230/chip.h>
 
 #include "k230_memorymap.h"
+#include "k230_hart.h"
 
 #include "hardware/k230_memorymap.h"
 #include "hardware/k230_plic.h"
+#include "hardware/k230_clint.h"
 
 #include "riscv_internal.h"
 #include "riscv_percpu.h"

arch/risc-v/src/k230/hardware/k230_memorymap.h

@@ -25,9 +25,21 @@
  * Pre-processor Definitions
  ****************************************************************************/
 
-/* Register Base Address ****************************************************/
+/* PLIC/CLINT Base Address **************************************************/
 
 #define K230_PLIC_BASE    0xF00000000
 #define K230_CLINT_BASE   (K230_PLIC_BASE + 0x04000000)
 
+/* T-Head c908 specific CSR */
+
+#define CSR_MCOR         0x7c2
+#define CSR_MHCR         0x7c1
+#define CSR_MCCR2        0x7c3
+#define CSR_MHINT        0x7c5
+#define CSR_MXSTATUS     0x7c0
+#define CSR_MRMR         0x7c6
+#define CSR_MRVBR        0x7c7
+#define CSR_MSMPR        0x7f3
+#define CSR_PLIC_BASE    0xfc1
+
 #endif /* __ARCH_RISCV_SRC_K230_HARDWARE_K230_MEMORYMAP_H */

arch/risc-v/src/k230/k230_hart.c

@@ -0,0 +1,91 @@
+/****************************************************************************
+ * arch/risc-v/src/k230/k230_hart.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdio.h>
+#include <assert.h>
+#include <debug.h>
+
+#include <nuttx/arch.h>
+#include <nuttx/irq.h>
+
+#include "riscv_internal.h"
+#include "chip.h"
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+#if !defined(CONFIG_BUILD_KERNEL) || defined(CONFIG_NUTTSBI)
+
+/****************************************************************************
+ * Name: hart_has_vec_ext()
+ * Description: returns Non-zero if CPU has vector extension
+ ****************************************************************************/
+
+int hart_has_vec_ext(void)
+{
+  #define MISA_VECTOR_BIT   ('V'-'A')
+  #define MISA_VECOTR_MASK  ( 1 << MISA_VECTOR_BIT )
+
+  return (READ_CSR(CSR_MISA) & MISA_VECOTR_MASK);
+}
+
+/****************************************************************************
+ * Name: k230_hart_init()
+ * Description: K230 M-mode HART initialization
+ ****************************************************************************/
+
+void k230_hart_init(void)
+{
+  if (hart_has_vec_ext())
+    {
+      WRITE_CSR(CSR_MHCR,  0x11ff);
+      WRITE_CSR(CSR_MCOR,  0x70013);
+      WRITE_CSR(CSR_MSMPR, 0x1);
+      WRITE_CSR(CSR_MCCR2, 0xe0410009);
+      WRITE_CSR(CSR_MHINT, 0x16e30c);
+    }
+
+  /* turn off MAEE to have standard PTE format */
+
+  WRITE_CSR(CSR_MXSTATUS, 0x438000);
+}
+#endif /* !defined(CONFIG_BUILD_KERNEL) || defined(CONFIG_NUTTSBI) */
+
+#ifdef CONFIG_NUTTSBI
+/****************************************************************************
+ * Name: sbi_late_initialize runs in M-mode
+ ****************************************************************************/
+
+void sbi_late_initialize(void)
+{
+  /* delegate K230 plic enable to S-mode */
+
+  *((volatile uint32_t *)K230_PLIC_CTRL) = 1;
+  k230_hart_init();
+}
+#endif

arch/risc-v/src/k230/k230_hart.h

@@ -0,0 +1,40 @@
+/****************************************************************************
+ * arch/risc-v/src/k230/k230_hart.h
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+#ifndef __ARCH_RISCV_SRC_K230_K230_HART_H
+#define __ARCH_RISCV_SRC_K230_K230_HART_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public functions
+ ****************************************************************************/
+
+#ifndef __ASSEMBLY__
+#if !defined(CONFIG_BUILD_KERNEL) || defined(CONFIG_NUTTSBI)
+
+int  hart_has_vec_ext(void);         /* checks for vector extension */
+void k230_hart_init(void);           /* M-mode initialization */
+
+#endif /* !defined(CONFIG_BUILD_KERNEL) || defined(CONFIG_NUTTSBI) */
+#endif /* __ASSEMBLY__ */
+#endif /* __ARCH_RISCV_SRC_K230_K230_HART_H */

arch/risc-v/src/k230/k230_irq.c

@@ -41,19 +41,6 @@
  * Public Functions
  ****************************************************************************/
 
-#ifdef CONFIG_NUTTSBI
-/****************************************************************************
- * Name: sbi_late_initialize  runs in M-mode
- ****************************************************************************/
-
-void sbi_late_initialize(void)
-{
-  /* delegate K230 plic enable to S-mode */
-
-  *((volatile uint32_t *)K230_PLIC_CTRL) = 1;
-}
-#endif
-
 /****************************************************************************
  * Name: up_irqinitialize
  ****************************************************************************/

arch/risc-v/src/k230/k230_start.c

@@ -129,6 +129,10 @@ void k230_start(int mhartid, const char *dtb)
 #endif
     }
 
+#ifndef CONFIG_BUILD_KERNEL
+    k230_hart_init();
+#endif
+
   /* Disable MMU */
 
   WRITE_CSR(satp, 0x0);