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