2 * Copyright (C) 2007 Freescale Semiconductor, Inc.
4 * Authors: Nick.Spence@freescale.com
5 * Wilson.Lo@freescale.com
6 * scottwood@freescale.com
8 * See file CREDITS for list of people who contributed to this
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License as
13 * published by the Free Software Foundation; either version 2 of
14 * the License, or (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS for A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
29 #include <spd_sdram.h>
31 #include <asm/bitops.h>
34 #include <asm/processor.h>
36 DECLARE_GLOBAL_DATA_PTR;
38 static void resume_from_sleep(void)
40 u32 magic = *(u32 *)0;
42 typedef void (*func_t)(void);
43 func_t resume = *(func_t *)4;
45 if (magic == 0xf5153ae5)
48 gd->flags &= ~GD_FLG_SILENT;
49 puts("\nResume from sleep failed: bad magic word\n");
52 /* Fixed sdram init -- doesn't use serial presence detect.
54 * This is useful for faster booting in configs where the RAM is unlikely
55 * to be changed, or for things like NAND booting where space is tight.
57 static long fixed_sdram(void)
59 volatile immap_t *im = (volatile immap_t *)CONFIG_SYS_IMMR;
60 u32 msize = CONFIG_SYS_DDR_SIZE * 1024 * 1024;
61 u32 msize_log2 = __ilog2(msize);
63 im->sysconf.ddrlaw[0].bar = CONFIG_SYS_DDR_SDRAM_BASE & 0xfffff000;
64 im->sysconf.ddrlaw[0].ar = LBLAWAR_EN | (msize_log2 - 1);
65 im->sysconf.ddrcdr = CONFIG_SYS_DDRCDR_VALUE;
68 * Erratum DDR3 requires a 50ms delay after clearing DDRCDR[DDR_cfg],
69 * or the DDR2 controller may fail to initialize correctly.
73 im->ddr.csbnds[0].csbnds = (msize - 1) >> 24;
74 im->ddr.cs_config[0] = CONFIG_SYS_DDR_CS0_CONFIG;
76 /* Currently we use only one CS, so disable the other bank. */
77 im->ddr.cs_config[1] = 0;
79 im->ddr.sdram_clk_cntl = CONFIG_SYS_DDR_SDRAM_CLK_CNTL;
80 im->ddr.timing_cfg_3 = CONFIG_SYS_DDR_TIMING_3;
81 im->ddr.timing_cfg_1 = CONFIG_SYS_DDR_TIMING_1;
82 im->ddr.timing_cfg_2 = CONFIG_SYS_DDR_TIMING_2;
83 im->ddr.timing_cfg_0 = CONFIG_SYS_DDR_TIMING_0;
85 if (im->pmc.pmccr1 & PMCCR1_POWER_OFF)
86 im->ddr.sdram_cfg = CONFIG_SYS_DDR_SDRAM_CFG | SDRAM_CFG_BI;
88 im->ddr.sdram_cfg = CONFIG_SYS_DDR_SDRAM_CFG;
90 im->ddr.sdram_cfg2 = CONFIG_SYS_DDR_SDRAM_CFG2;
91 im->ddr.sdram_mode = CONFIG_SYS_DDR_MODE;
92 im->ddr.sdram_mode2 = CONFIG_SYS_DDR_MODE2;
94 im->ddr.sdram_interval = CONFIG_SYS_DDR_INTERVAL;
97 /* enable DDR controller */
98 im->ddr.sdram_cfg |= SDRAM_CFG_MEM_EN;
104 phys_size_t initdram(int board_type)
106 volatile immap_t *im = (volatile immap_t *)CONFIG_SYS_IMMR;
109 if ((im->sysconf.immrbar & IMMRBAR_BASE_ADDR) != (u32)im)
113 msize = fixed_sdram();
115 if (im->pmc.pmccr1 & PMCCR1_POWER_OFF)
118 /* return total bus SDRAM size(bytes) -- DDR */