GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/arch/riscv/cpu/ax25/Kconfig

@@ -0,0 +1,24 @@
+config RISCV_NDS
+	bool
+	select ARCH_EARLY_INIT_R
+	imply CPU
+	imply CPU_RISCV
+	imply RISCV_TIMER
+	imply ANDES_PLIC if (RISCV_MMODE || SPL_RISCV_MMODE)
+	imply ANDES_PLMT if (RISCV_MMODE || SPL_RISCV_MMODE)
+	imply SPL_CPU_SUPPORT
+	imply SPL_OPENSBI
+	imply SPL_LOAD_FIT
+	help
+	  Run U-Boot on AndeStar V5 platforms and use some specific features
+	  which are provided by Andes Technology AndeStar V5 families.
+
+if RISCV_NDS
+
+config RISCV_NDS_CACHE
+	bool "AndeStar V5 families specific cache support"
+	depends on RISCV_MMODE || SPL_RISCV_MMODE
+	help
+	  Provide Andes Technology AndeStar V5 families specific cache support.
+
+endif

source/bootloader/u-boot-2020.01/arch/riscv/cpu/ax25/Makefile

@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright (C) 2017 Andes Technology Corporation
+# Rick Chen, Andes Technology Corporation <rick@andestech.com>
+
+obj-y	:= cpu.o
+obj-y	+= cache.o

source/bootloader/u-boot-2020.01/arch/riscv/cpu/ax25/cache.c

@@ -0,0 +1,171 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2017 Andes Technology Corporation
+ * Rick Chen, Andes Technology Corporation <rick@andestech.com>
+ */
+
+#include <common.h>
+#include <cpu_func.h>
+#include <dm.h>
+#include <dm/uclass-internal.h>
+#include <cache.h>
+#include <asm/csr.h>
+
+#ifdef CONFIG_RISCV_NDS_CACHE
+#if CONFIG_IS_ENABLED(RISCV_MMODE) || CONFIG_IS_ENABLED(SPL_RISCV_MMODE)
+/* mcctlcommand */
+#define CCTL_REG_MCCTLCOMMAND_NUM	0x7cc
+
+/* D-cache operation */
+#define CCTL_L1D_WBINVAL_ALL	6
+#endif
+#endif
+
+#ifdef CONFIG_V5L2_CACHE
+static void _cache_enable(void)
+{
+	struct udevice *dev = NULL;
+
+	uclass_find_first_device(UCLASS_CACHE, &dev);
+
+	if (dev)
+		cache_enable(dev);
+}
+
+static void _cache_disable(void)
+{
+	struct udevice *dev = NULL;
+
+	uclass_find_first_device(UCLASS_CACHE, &dev);
+
+	if (dev)
+		cache_disable(dev);
+}
+#endif
+
+void flush_dcache_all(void)
+{
+#if !CONFIG_IS_ENABLED(SYS_ICACHE_OFF)
+#ifdef CONFIG_RISCV_NDS_CACHE
+#if CONFIG_IS_ENABLED(RISCV_MMODE) || CONFIG_IS_ENABLED(SPL_RISCV_MMODE)
+	csr_write(CCTL_REG_MCCTLCOMMAND_NUM, CCTL_L1D_WBINVAL_ALL);
+#endif
+#endif
+#endif
+}
+
+void flush_dcache_range(unsigned long start, unsigned long end)
+{
+	flush_dcache_all();
+}
+
+void invalidate_dcache_range(unsigned long start, unsigned long end)
+{
+	flush_dcache_all();
+}
+
+void icache_enable(void)
+{
+#if !CONFIG_IS_ENABLED(SYS_ICACHE_OFF)
+#ifdef CONFIG_RISCV_NDS_CACHE
+#if CONFIG_IS_ENABLED(RISCV_MMODE) || CONFIG_IS_ENABLED(SPL_RISCV_MMODE)
+	asm volatile (
+		"csrr t1, mcache_ctl\n\t"
+		"ori t0, t1, 0x1\n\t"
+		"csrw mcache_ctl, t0\n\t"
+	);
+#endif
+#endif
+#endif
+}
+
+void icache_disable(void)
+{
+#if !CONFIG_IS_ENABLED(SYS_ICACHE_OFF)
+#ifdef CONFIG_RISCV_NDS_CACHE
+#if CONFIG_IS_ENABLED(RISCV_MMODE) || CONFIG_IS_ENABLED(SPL_RISCV_MMODE)
+	asm volatile (
+		"fence.i\n\t"
+		"csrr t1, mcache_ctl\n\t"
+		"andi t0, t1, ~0x1\n\t"
+		"csrw mcache_ctl, t0\n\t"
+	);
+#endif
+#endif
+#endif
+}
+
+void dcache_enable(void)
+{
+#if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF)
+#ifdef CONFIG_RISCV_NDS_CACHE
+#if CONFIG_IS_ENABLED(RISCV_MMODE) || CONFIG_IS_ENABLED(SPL_RISCV_MMODE)
+	asm volatile (
+		"csrr t1, mcache_ctl\n\t"
+		"ori t0, t1, 0x2\n\t"
+		"csrw mcache_ctl, t0\n\t"
+	);
+#endif
+#ifdef CONFIG_V5L2_CACHE
+	_cache_enable();
+#endif
+#endif
+#endif
+}
+
+void dcache_disable(void)
+{
+#if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF)
+#ifdef CONFIG_RISCV_NDS_CACHE
+#if CONFIG_IS_ENABLED(RISCV_MMODE) || CONFIG_IS_ENABLED(SPL_RISCV_MMODE)
+	csr_write(CCTL_REG_MCCTLCOMMAND_NUM, CCTL_L1D_WBINVAL_ALL);
+	asm volatile (
+		"csrr t1, mcache_ctl\n\t"
+		"andi t0, t1, ~0x2\n\t"
+		"csrw mcache_ctl, t0\n\t"
+	);
+#endif
+#ifdef CONFIG_V5L2_CACHE
+	_cache_disable();
+#endif
+#endif
+#endif
+}
+
+int icache_status(void)
+{
+	int ret = 0;
+
+#ifdef CONFIG_RISCV_NDS_CACHE
+#if CONFIG_IS_ENABLED(RISCV_MMODE) || CONFIG_IS_ENABLED(SPL_RISCV_MMODE)
+	asm volatile (
+		"csrr t1, mcache_ctl\n\t"
+		"andi	%0, t1, 0x01\n\t"
+		: "=r" (ret)
+		:
+		: "memory"
+	);
+#endif
+#endif
+
+	return ret;
+}
+
+int dcache_status(void)
+{
+	int ret = 0;
+
+#ifdef CONFIG_RISCV_NDS_CACHE
+#if CONFIG_IS_ENABLED(RISCV_MMODE) || CONFIG_IS_ENABLED(SPL_RISCV_MMODE)
+	asm volatile (
+		"csrr t1, mcache_ctl\n\t"
+		"andi	%0, t1, 0x02\n\t"
+		: "=r" (ret)
+		:
+		: "memory"
+	);
+#endif
+#endif
+
+	return ret;
+}

source/bootloader/u-boot-2020.01/arch/riscv/cpu/ax25/cpu.c

@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2017 Andes Technology Corporation
+ * Rick Chen, Andes Technology Corporation <rick@andestech.com>
+ */
+
+/* CPU specific code */
+#include <common.h>
+#include <cpu_func.h>
+#include <irq_func.h>
+#include <asm/cache.h>
+
+/*
+ * cleanup_before_linux() is called just before we call linux
+ * it prepares the processor for linux
+ *
+ * we disable interrupt and caches.
+ */
+int cleanup_before_linux(void)
+{
+	disable_interrupts();
+
+	/* turn off I/D-cache */
+	cache_flush();
+	icache_disable();
+	dcache_disable();
+
+	return 0;
+}