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Project/Src/rt-thread/libcpu/mips/loongson_1c/sdram_cfg.h

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+
+#ifndef __OPENLOONGSON_SDRAM_CFG_H
+#define __OPENLOONGSON_SDRAM_CFG_H
+
+
+//#define	SD_FREQ	(6 * PLL_M) / (2 * SDRAM_PARAM_DIV_NUM)
+#define	SD_FREQ	(((APB_CLK / 4) * (PLL_MULT / CPU_DIV)) / SDRAM_PARAM_DIV_NUM)
+
+ 
+/* 颗粒行数 */
+#define	ROW_1K		0x7
+#define	ROW_2K		0x0
+#define	ROW_4K		0x1
+#define	ROW_8K		0x2
+#define	ROW_16K		0x3
+/* 颗粒列数 */
+#define	COL_256		0x7
+#define	COL_512		0x0
+#define	COL_1K		0x1
+#define	COL_2K		0x2
+#define	COL_4K		0x3
+/* 颗粒位宽 */
+#define	WIDTH_8		0x0
+#define	WIDTH_16	0x1
+#define	WIDTH_32	0x2
+
+#define	TRCD		3
+#define	TCL			3
+#define	TRP			3
+#define	TRFC		8
+#define	TRAS		6
+#define	TREF		0x818
+#define	TWR			2
+
+#define	DEF_SEL		0x1
+#define	DEF_SEL_N	0x0
+#define	HANG_UP		0x1
+#define	HANG_UP_N	0x0
+#define	CFG_VALID	0x1
+
+
+#if 0
+// 白菜板8MB
+/*
+    以型号为IS42S16400的SDRAM为例，
+    物理参数为，
+    容量：8MB
+    位宽：16位
+    列宽：8位，即2的8次方，即256
+    行宽：12位，即2的12次方，即4K
+
+    所以，
+    颗粒的位宽=WIDTH_16
+    颗粒的列数=COL_256
+    颗粒的行数=ROW_4K
+
+    再结合宏SD_PARA0和芯片手册中寄存器SD_CONFIG，相信一看就能明白
+    替换宏SD_PARA0中的行宽、列宽和位宽
+*/
+#define SDRAM_WIDTH         (WIDTH_16)
+#define SDRAM_COL           (COL_256)
+#define SDRAM_ROW           (ROW_4K)
+
+#else
+
+// 智龙32MByte
+#define SDRAM_WIDTH         (WIDTH_16)
+#define SDRAM_COL           (COL_512)
+#define SDRAM_ROW           (ROW_8K)
+
+#endif
+
+#define	SD_PARA0	(0x7f<<25 | \
+					(TRAS << 21) | \
+					(TRFC << 17) | (TRP << 14) | (TCL << 11) | \
+					(TRCD << 8) | (SDRAM_WIDTH << 6) | (SDRAM_COL << 3) | \
+					SDRAM_ROW)
+
+#define	SD_PARA1	((HANG_UP_N << 8) | (DEF_SEL_N << 7) | (TWR << 5) | (TREF >> 7))
+
+#define	SD_PARA1_EN	((CFG_VALID << 9) | (HANG_UP_N << 8) | \
+					(DEF_SEL_N << 7) | (TWR << 5) | (TREF >> 7))
+
+
+#endif