79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2007 Freescale Semiconductor, Inc.
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* Copyright (C) 2010 Ilya Yanok, Emcraft Systems, yanok@emcraft.com
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*
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* This files is mostly identical to the original from
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* board/freescale/mpc8308rdb/sdram.c
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*/
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#include <common.h>
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#include <mpc83xx.h>
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#include <asm/bitops.h>
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#include <asm/io.h>
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#include <asm/processor.h>
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DECLARE_GLOBAL_DATA_PTR;
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/* Fixed sdram init -- doesn't use serial presence detect.
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*
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* This is useful for faster booting in configs where the RAM is unlikely
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* to be changed, or for things like NAND booting where space is tight.
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*/
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static long fixed_sdram(void)
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{
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immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
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u32 msize = CONFIG_SYS_DDR_SIZE * 1024 * 1024;
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u32 msize_log2 = __ilog2(msize);
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out_be32(&im->sysconf.ddrlaw[0].bar,
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CONFIG_SYS_SDRAM_BASE & 0xfffff000);
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out_be32(&im->sysconf.ddrlaw[0].ar, LBLAWAR_EN | (msize_log2 - 1));
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out_be32(&im->sysconf.ddrcdr, CONFIG_SYS_DDRCDR_VALUE);
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out_be32(&im->ddr.csbnds[0].csbnds, (msize - 1) >> 24);
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out_be32(&im->ddr.cs_config[0], CONFIG_SYS_DDR_CS0_CONFIG);
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/* Currently we use only one CS, so disable the other bank. */
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out_be32(&im->ddr.cs_config[1], 0);
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out_be32(&im->ddr.sdram_clk_cntl, CONFIG_SYS_DDR_SDRAM_CLK_CNTL);
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out_be32(&im->ddr.timing_cfg_3, CONFIG_SYS_DDR_TIMING_3);
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out_be32(&im->ddr.timing_cfg_1, CONFIG_SYS_DDR_TIMING_1);
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out_be32(&im->ddr.timing_cfg_2, CONFIG_SYS_DDR_TIMING_2);
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out_be32(&im->ddr.timing_cfg_0, CONFIG_SYS_DDR_TIMING_0);
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out_be32(&im->ddr.sdram_cfg, CONFIG_SYS_DDR_SDRAM_CFG);
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out_be32(&im->ddr.sdram_cfg2, CONFIG_SYS_DDR_SDRAM_CFG2);
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out_be32(&im->ddr.sdram_mode, CONFIG_SYS_DDR_MODE);
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out_be32(&im->ddr.sdram_mode2, CONFIG_SYS_DDR_MODE2);
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out_be32(&im->ddr.sdram_interval, CONFIG_SYS_DDR_INTERVAL);
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sync();
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/* enable DDR controller */
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setbits_be32(&im->ddr.sdram_cfg, SDRAM_CFG_MEM_EN);
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sync();
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return get_ram_size(CONFIG_SYS_SDRAM_BASE, msize);
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}
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int dram_init(void)
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{
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immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
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u32 msize;
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if ((in_be32(&im->sysconf.immrbar) & IMMRBAR_BASE_ADDR) != (u32)im)
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return -1;
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/* DDR SDRAM */
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msize = fixed_sdram();
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/* set total bus SDRAM size(bytes) -- DDR */
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gd->ram_size = msize;
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return 0;
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}
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