soc/sifive/fu540: add CLINT support

Change-Id: Ibc3a8644dcb83d5697d9d6e551c7682377285116
Signed-off-by: Xiang Wang <wxjstz@126.com>
Reviewed-on: https://review.coreboot.org/28355
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>

src/soc/sifive/fu540/Makefile.inc

@@ -14,7 +14,7 @@
 ifeq ($(CONFIG_SOC_SIFIVE_FU540),y)
 
 bootblock-y += uart.c
-bootblock-y += mtime.c
+bootblock-y += clint.c
 bootblock-y += media.c
 bootblock-y += bootblock.c
 

src/soc/sifive/fu540/clint.c

@@ -0,0 +1,32 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2018 HardenedLinux
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <mcall.h>
+#include <arch/io.h>
+#include <soc/addressmap.h>
+#include <soc/clint.h>
+
+void mtime_init(void)
+{
+	long hart_id = read_csr(mhartid);
+	HLS()->time = (uint64_t *)(FU540_CLINT + 0xbff8);
+	HLS()->timecmp = (uint64_t *)(FU540_CLINT + 0x4000 + 8 * hart_id);
+}
+
+void set_msip(int hartid, int val)
+{
+	long hart_id = read_csr(mhartid);
+	write32((void *)(FU540_CLINT + 4 * hart_id), !!val);
+}

src/soc/sifive/fu540/include/soc/addressmap.h

@@ -15,6 +15,7 @@
 
 #define FU540_MSEL		0x00001000
 #define FU540_DTIM		0x01000000
+#define FU540_CLINT		0x02000000
 #define FU540_L2LIM		0x08000000
 #define FU540_UART0		0x10010000
 #define FU540_UART(x)		(FU540_UART0 + 0x1000 * (x))

src/soc/sifive/fu540/include/soc/clint.h

@@ -13,10 +13,12 @@
  * GNU General Public License for more details.
  */
 
-#include <mcall.h>
+#ifndef __SOC_SIFIVE_FU540_CLINT_H
+#define __SOC_SIFIVE_FU540_CLINT_H
 
-/* FIXME: This is an empty implementation, please improve */
-/* This function is used to initialize HLS()->time/HLS()->timecmp  */
-void mtime_init(void)
-{
-}
+/* This function is used to set MSIP.
+ * It can be used to send an IPI (inter-processor interrupt) to
+ * another hart*/
+void set_msip(int hartid, int val);
+
+#endif