1 /*
2  * (C) Copyright 2000-2003
3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4  *
5  * Copyright (C) 2004-2008 Freescale Semiconductor, Inc.
6  * TsiChung Liew (Tsi-Chung.Liew@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 <spi.h>
29 #include <asm/immap.h>
30 
31 DECLARE_GLOBAL_DATA_PTR;
32 
33 int checkboard(void)
34 {
35 	/*
36 	 * need to to:
37 	 * Check serial flash size. if 2mb evb, else 8mb demo
38 	 */
39 	puts("Board: ");
40 	puts("Freescale M54451 EVB\n");
41 	return 0;
42 };
43 
44 phys_size_t initdram(int board_type)
45 {
46 	u32 dramsize;
47 #ifdef CONFIG_CF_SBF
48 	/*
49 	 * Serial Boot: The dram is already initialized in start.S
50 	 * only require to return DRAM size
51 	 */
52 	dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
53 #else
54 	volatile sdramc_t *sdram = (volatile sdramc_t *)(MMAP_SDRAM);
55 	volatile gpio_t *gpio = (volatile gpio_t *)(MMAP_GPIO);
56 	u32 i;
57 
58 	dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
59 
60 	if ((sdram->sdcfg1 == CONFIG_SYS_SDRAM_CFG1) &&
61 	    (sdram->sdcfg2 == CONFIG_SYS_SDRAM_CFG2))
62 		return dramsize;
63 
64 	for (i = 0x13; i < 0x20; i++) {
65 		if (dramsize == (1 << i))
66 			break;
67 	}
68 	i--;
69 
70 	gpio->mscr_sdram = CONFIG_SYS_SDRAM_DRV_STRENGTH;
71 
72 	sdram->sdcs0 = (CONFIG_SYS_SDRAM_BASE | i);
73 
74 	sdram->sdcfg1 = CONFIG_SYS_SDRAM_CFG1;
75 	sdram->sdcfg2 = CONFIG_SYS_SDRAM_CFG2;
76 
77 	udelay(200);
78 
79 	/* Issue PALL */
80 	sdram->sdcr = CONFIG_SYS_SDRAM_CTRL | 2;
81 	__asm__("nop");
82 
83 	/* Perform two refresh cycles */
84 	sdram->sdcr = CONFIG_SYS_SDRAM_CTRL | 4;
85 	__asm__("nop");
86 	sdram->sdcr = CONFIG_SYS_SDRAM_CTRL | 4;
87 	__asm__("nop");
88 
89 	/* Issue LEMR */
90 	sdram->sdmr = CONFIG_SYS_SDRAM_MODE;
91 	__asm__("nop");
92 	sdram->sdmr = CONFIG_SYS_SDRAM_EMOD;
93 	__asm__("nop");
94 
95 	sdram->sdcr = (CONFIG_SYS_SDRAM_CTRL & ~0x80000000) | 0x10000000;
96 
97 	udelay(100);
98 #endif
99 	return (dramsize);
100 };
101 
102 int testdram(void)
103 {
104 	/* TODO: XXX XXX XXX */
105 	printf("DRAM test not implemented!\n");
106 
107 	return (0);
108 }
109