1 files changed, 108 insertions, 0 deletions
diff --git a/nor_flash.c b/nor_flash.c
new file mode 100644
index 0000000..3083735
--- /dev/null
+++ b/nor_flash.c
@@ -0,0 +1,108 @@
+/*
+    Nios-sim - one simple NIOSII simulator only for personal interest and fun.
+    Copyright (C) 2010  chysun2000@gmail.com
+
+    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; either version 2 of the License, or
+    (at your option) any later version.
+
+    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.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "public.h"
+#include "niosii.h"
+#include "io_device.h"
+#include "nor_flash.h"
+
+static struct nor_flash_core_hw hw;
+
+static void flash_init(struct io_device * self)
+{
+	memset(&hw, 0x00, sizeof(struct nor_flash_core_hw));
+	self->priv_data = &hw;
+	
+	hw.phys_base_addr = NOR_FLASH_BASE_ADDR;
+	hw.size = NOR_FLASH_SIZE;
+	hw.status = STATUS_READ;
+	hw.mem_base_addr = (unsigned char *)malloc(hw.size);
+	
+	printf("NOR Flash Module: PHYS:0x%08X at %p size:0x%08X\n",
+			hw.phys_base_addr, hw.mem_base_addr, hw.size);
+}
+
+static int32_t flash_is_belong(uint32_t address)
+{
+	int32_t ret_val = ADDR_IS_NOT_DEV;
+	
+	if (address >= hw.phys_base_addr && address <(hw.phys_base_addr + hw.size)){
+		ret_val = ADDR_IS_DEV;
+	}
+	return ret_val;
+}
+
+/* only support 8bit access */
+static uint32_t flash_read(struct io_device * self, uint32_t addr, uint32_t data_len)
+{
+	uint32_t ret_val = 0;
+	uint8_t * data = (uint8_t *)hw.mem_base_addr;
+	
+	if(data_len == (hw.bus_width / 8)){
+		ret_val = (uint32_t)(data[addr - hw.phys_base_addr]);
+		printf("%s->%x:%x\n",__func__,addr,ret_val);
+	}
+	return ret_val;
+}
+
+static int32_t judge_special_addr(uint32_t addr)
+{
+	int32_t ret_val = SIM_TRUE;
+	return ret_val;
+}
+
+static void handle_special_operation(uint32_t addr, uint32_t data)
+{
+	
+}
+
+static void flash_write(struct io_device * self, uint32_t addr, uint32_t data, 
+						uint32_t data_len)
+{
+	uint8_t * data_buf = (uint8_t *)hw.mem_base_addr;
+	
+	/* judge whether the address is the special address */
+	if (judge_special_addr(addr) == SIM_TRUE){
+		handle_special_operation(addr, data);
+	} else {
+		if (hw.status == STATUS_CHIP_ERASE || hw.status == STATUS_SECTION_ERASE){
+			if (data_len == (hw.bus_width/8)){
+				data_buf[(addr - hw.phys_base_addr)] = (uint8_t)(data & 0xFF);
+			}
+		}
+	}
+}
+
+struct io_device nor_flash_core = {
+	.name = "NOR Flash Core",
+	.init = flash_init,
+	.is_belong = flash_is_belong,
+	.read_data = flash_read,
+	.write_data = flash_write,
+	.has_irq = NULL,
+	.simulate = NULL,
+	.irq_enable_mask = 0,
+};
+
+uint8_t * nor_flash_mem_addr(void)
+{
+	return hw.mem_base_addr;
+}
+
+