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c63e137014
JEDEC spec requires the clocks to be stable before deasserting reset signal for RDIMMs. Clocks start when any chip select is enabled and clock control register is set. This patch also adds the interface to toggle memory reset signal if needed by the boards. Signed-off-by: York Sun <yorksun@freescale.com>
72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
/*
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* Copyright 2013 Freescale Semiconductor, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* Version 2 as published by the Free Software Foundation.
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*/
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#include <common.h>
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#include <asm/mmu.h>
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#include <asm/immap_85xx.h>
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#include <asm/processor.h>
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#include <asm/fsl_ddr_sdram.h>
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#include <asm/fsl_ddr_dimm_params.h>
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#include <asm/io.h>
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#include <asm/fsl_law.h>
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/* Fixed sdram init -- doesn't use serial presence detect. */
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phys_size_t fixed_sdram(void)
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{
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sys_info_t sysinfo;
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char buf[32];
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size_t ddr_size;
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fsl_ddr_cfg_regs_t ddr_cfg_regs = {
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.cs[0].bnds = CONFIG_SYS_DDR_CS0_BNDS,
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.cs[0].config = CONFIG_SYS_DDR_CS0_CONFIG,
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.cs[0].config_2 = CONFIG_SYS_DDR_CS0_CONFIG_2,
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#if CONFIG_CHIP_SELECTS_PER_CTRL > 1
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.cs[1].bnds = CONFIG_SYS_DDR_CS1_BNDS,
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.cs[1].config = CONFIG_SYS_DDR_CS1_CONFIG,
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.cs[1].config_2 = CONFIG_SYS_DDR_CS1_CONFIG_2,
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#endif
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.timing_cfg_3 = CONFIG_SYS_DDR_TIMING_3,
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.timing_cfg_0 = CONFIG_SYS_DDR_TIMING_0,
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.timing_cfg_1 = CONFIG_SYS_DDR_TIMING_1,
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.timing_cfg_2 = CONFIG_SYS_DDR_TIMING_2,
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.ddr_sdram_cfg = CONFIG_SYS_DDR_CONTROL,
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.ddr_sdram_cfg_2 = CONFIG_SYS_DDR_CONTROL_2,
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.ddr_sdram_mode = CONFIG_SYS_DDR_MODE_1,
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.ddr_sdram_mode_2 = CONFIG_SYS_DDR_MODE_2,
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.ddr_sdram_md_cntl = CONFIG_SYS_DDR_MODE_CONTROL,
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.ddr_sdram_interval = CONFIG_SYS_DDR_INTERVAL,
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.ddr_data_init = CONFIG_SYS_DDR_DATA_INIT,
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.ddr_sdram_clk_cntl = CONFIG_SYS_DDR_CLK_CTRL,
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.ddr_init_addr = CONFIG_SYS_DDR_INIT_ADDR,
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.ddr_init_ext_addr = CONFIG_SYS_DDR_INIT_EXT_ADDR,
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.timing_cfg_4 = CONFIG_SYS_DDR_TIMING_4,
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.timing_cfg_5 = CONFIG_SYS_DDR_TIMING_5,
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.ddr_zq_cntl = CONFIG_SYS_DDR_ZQ_CONTROL,
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.ddr_wrlvl_cntl = CONFIG_SYS_DDR_WRLVL_CONTROL,
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.ddr_sr_cntr = CONFIG_SYS_DDR_SR_CNTR,
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.ddr_sdram_rcw_1 = CONFIG_SYS_DDR_RCW_1,
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.ddr_sdram_rcw_2 = CONFIG_SYS_DDR_RCW_2
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};
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get_sys_info(&sysinfo);
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printf("Configuring DDR for %s MT/s data rate\n",
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strmhz(buf, sysinfo.freqDDRBus));
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ddr_size = CONFIG_SYS_SDRAM_SIZE * 1024 * 1024;
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fsl_ddr_set_memctl_regs(&ddr_cfg_regs, 0, 0);
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if (set_ddr_laws(CONFIG_SYS_DDR_SDRAM_BASE,
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ddr_size, LAW_TRGT_IF_DDR_1) < 0) {
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printf("ERROR setting Local Access Windows for DDR\n");
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return 0;
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};
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return ddr_size;
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}
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