1 /*
2  * (C) Copyright 2000-2003
3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4  *
5  * Copyright (C) 2004-2007 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 <asm/immap.h>
29 
30 DECLARE_GLOBAL_DATA_PTR;
31 
32 int checkboard(void)
33 {
34 	puts("Board: ");
35 	puts("Freescale M52277 EVB\n");
36 	return 0;
37 };
38 
39 phys_size_t initdram(int board_type)
40 {
41 	u32 dramsize;
42 
43 #ifdef CONFIG_CF_SBF
44 	/*
45 	 * Serial Boot: The dram is already initialized in start.S
46 	 * only require to return DRAM size
47 	 */
48 	dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
49 #else
50 	volatile sdramc_t *sdram = (volatile sdramc_t *)(MMAP_SDRAM);
51 	volatile gpio_t *gpio = (volatile gpio_t *)(MMAP_GPIO);
52 	u32 i;
53 
54 	dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
55 
56 	for (i = 0x13; i < 0x20; i++) {
57 		if (dramsize == (1 << i))
58 			break;
59 	}
60 	i--;
61 
62 	gpio->mscr_sdram = CONFIG_SYS_SDRAM_DRV_STRENGTH;
63 
64 	sdram->sdcs0 = (CONFIG_SYS_SDRAM_BASE | i);
65 
66 	sdram->sdcfg1 = CONFIG_SYS_SDRAM_CFG1;
67 	sdram->sdcfg2 = CONFIG_SYS_SDRAM_CFG2;
68 
69 	/* Issue PALL */
70 	sdram->sdcr = CONFIG_SYS_SDRAM_CTRL | 2;
71 	__asm__("nop");
72 
73 	/* Issue LEMR */
74 	sdram->sdmr = CONFIG_SYS_SDRAM_MODE;
75 	__asm__("nop");
76 	sdram->sdmr = CONFIG_SYS_SDRAM_EMOD;
77 	__asm__("nop");
78 
79 	udelay(1000);
80 
81 	/* Issue PALL */
82 	sdram->sdcr = CONFIG_SYS_SDRAM_CTRL | 2;
83 	__asm__("nop");
84 
85 	/* Perform two refresh cycles */
86 	sdram->sdcr = CONFIG_SYS_SDRAM_CTRL | 4;
87 	__asm__("nop");
88 	sdram->sdcr = CONFIG_SYS_SDRAM_CTRL | 4;
89 	__asm__("nop");
90 
91 	sdram->sdcr = (CONFIG_SYS_SDRAM_CTRL & ~0x80000000) | 0x10000C00;
92 
93 	udelay(100);
94 #endif
95 	return (dramsize);
96 };
97 
98 int testdram(void)
99 {
100 	/* TODO: XXX XXX XXX */
101 	printf("DRAM test not implemented!\n");
102 
103 	return (0);
104 }
105