1 /*
2  * (C) Copyright 2000-2003
3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4  *
5  * Copyright (C) 2004-2007, 2012 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 #include <asm/io.h>
30 
31 DECLARE_GLOBAL_DATA_PTR;
32 
33 int checkboard(void)
34 {
35 	puts("Board: ");
36 	puts("Freescale M52277 EVB\n");
37 	return 0;
38 };
39 
40 phys_size_t initdram(int board_type)
41 {
42 	u32 dramsize;
43 
44 #ifdef CONFIG_CF_SBF
45 	/*
46 	 * Serial Boot: The dram is already initialized in start.S
47 	 * only require to return DRAM size
48 	 */
49 	dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
50 #else
51 	sdramc_t *sdram = (sdramc_t *)(MMAP_SDRAM);
52 	gpio_t *gpio = (gpio_t *)(MMAP_GPIO);
53 	u32 i;
54 
55 	dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
56 
57 	for (i = 0x13; i < 0x20; i++) {
58 		if (dramsize == (1 << i))
59 			break;
60 	}
61 	i--;
62 
63 	out_8(&gpio->mscr_sdram, CONFIG_SYS_SDRAM_DRV_STRENGTH);
64 
65 	out_be32(&sdram->sdcs0, CONFIG_SYS_SDRAM_BASE | i);
66 
67 	out_be32(&sdram->sdcfg1, CONFIG_SYS_SDRAM_CFG1);
68 	out_be32(&sdram->sdcfg2, CONFIG_SYS_SDRAM_CFG2);
69 
70 	/* Issue PALL */
71 	out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 2);
72 	__asm__("nop");
73 
74 	/* Issue LEMR */
75 	out_be32(&sdram->sdmr, CONFIG_SYS_SDRAM_MODE);
76 	__asm__("nop");
77 	out_be32(&sdram->sdmr, CONFIG_SYS_SDRAM_EMOD);
78 	__asm__("nop");
79 
80 	udelay(1000);
81 
82 	/* Issue PALL */
83 	out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 2);
84 	__asm__("nop");
85 
86 	/* Perform two refresh cycles */
87 	out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 4);
88 	__asm__("nop");
89 	out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 4);
90 	__asm__("nop");
91 
92 	out_be32(&sdram->sdcr,
93 		(CONFIG_SYS_SDRAM_CTRL & ~0x80000000) | 0x10000c00);
94 
95 	udelay(100);
96 #endif
97 	return (dramsize);
98 };
99 
100 int testdram(void)
101 {
102 	/* TODO: XXX XXX XXX */
103 	printf("DRAM test not implemented!\n");
104 
105 	return (0);
106 }
107