source: SVN/rincon/u-boot/board/freescale/mpc8315erdb/sdram.c @ 55

Last change on this file since 55 was 55, checked in by Tim Harvey, 22 months ago

rincon: added latest u-boot source

restored form server backup

Signed-off-by: Tim Harvey <tharvey@…>

File size: 3.2 KB
Line 
1/*
2 * Copyright (C) 2007 Freescale Semiconductor, Inc.
3 *
4 * Authors: Nick.Spence@freescale.com
5 *          Wilson.Lo@freescale.com
6 *          scottwood@freescale.com
7 *
8 * See file CREDITS for list of people who contributed to this
9 * project.
10 *
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.
15 *
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.
20 *
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,
24 * MA 02111-1307 USA
25 */
26
27#include <common.h>
28#include <mpc83xx.h>
29#include <spd_sdram.h>
30
31#include <asm/bitops.h>
32#include <asm/io.h>
33
34#include <asm/processor.h>
35
36DECLARE_GLOBAL_DATA_PTR;
37
38static void resume_from_sleep(void)
39{
40        u32 magic = *(u32 *)0;
41
42        typedef void (*func_t)(void);
43        func_t resume = *(func_t *)4;
44
45        if (magic == 0xf5153ae5)
46                resume();
47
48        gd->flags &= ~GD_FLG_SILENT;
49        puts("\nResume from sleep failed: bad magic word\n");
50}
51
52/* Fixed sdram init -- doesn't use serial presence detect.
53 *
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.
56 */
57static long fixed_sdram(void)
58{
59        volatile immap_t *im = (volatile immap_t *)CFG_IMMR;
60        u32 msize = CFG_DDR_SIZE * 1024 * 1024;
61        u32 msize_log2 = __ilog2(msize);
62
63        im->sysconf.ddrlaw[0].bar = CFG_DDR_SDRAM_BASE >> 12;
64        im->sysconf.ddrlaw[0].ar = LBLAWAR_EN | (msize_log2 - 1);
65        im->sysconf.ddrcdr = CFG_DDRCDR_VALUE;
66
67        /*
68         * Erratum DDR3 requires a 50ms delay after clearing DDRCDR[DDR_cfg],
69         * or the DDR2 controller may fail to initialize correctly.
70         */
71        udelay(50000);
72
73        im->ddr.csbnds[0].csbnds = (msize - 1) >> 24;
74        im->ddr.cs_config[0] = CFG_DDR_CS0_CONFIG;
75
76        /* Currently we use only one CS, so disable the other bank. */
77        im->ddr.cs_config[1] = 0;
78
79        im->ddr.sdram_clk_cntl = CFG_DDR_SDRAM_CLK_CNTL;
80        im->ddr.timing_cfg_3 = CFG_DDR_TIMING_3;
81        im->ddr.timing_cfg_1 = CFG_DDR_TIMING_1;
82        im->ddr.timing_cfg_2 = CFG_DDR_TIMING_2;
83        im->ddr.timing_cfg_0 = CFG_DDR_TIMING_0;
84
85        if (im->pmc.pmccr1 & PMCCR1_POWER_OFF)
86                im->ddr.sdram_cfg = CFG_DDR_SDRAM_CFG | SDRAM_CFG_BI;
87        else
88                im->ddr.sdram_cfg = CFG_DDR_SDRAM_CFG;
89
90        im->ddr.sdram_cfg2 = CFG_DDR_SDRAM_CFG2;
91        im->ddr.sdram_mode = CFG_DDR_MODE;
92        im->ddr.sdram_mode2 = CFG_DDR_MODE2;
93
94        im->ddr.sdram_interval = CFG_DDR_INTERVAL;
95        sync();
96
97        /* enable DDR controller */
98        im->ddr.sdram_cfg |= SDRAM_CFG_MEM_EN;
99        sync();
100
101        return msize;
102}
103
104phys_size_t initdram(int board_type)
105{
106        volatile immap_t *im = (volatile immap_t *)CFG_IMMR;
107        u32 msize;
108
109        if ((im->sysconf.immrbar & IMMRBAR_BASE_ADDR) != (u32)im)
110                return -1;
111
112        /* DDR SDRAM */
113        msize = fixed_sdram();
114
115        if (im->pmc.pmccr1 & PMCCR1_POWER_OFF)
116                resume_from_sleep();
117
118        /* return total bus SDRAM size(bytes)  -- DDR */
119        return msize;
120}
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