1 /*
2  * (C) Copyright 2000-2003
3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4  *
5  * Copyright (C) 2004-2008, 2012 Freescale Semiconductor, Inc.
6  * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
7  *
8  * SPDX-License-Identifier:	GPL-2.0+
9  */
10 
11 #include <common.h>
12 #include <spi.h>
13 #include <asm/immap.h>
14 #include <asm/io.h>
15 
16 DECLARE_GLOBAL_DATA_PTR;
17 
18 int checkboard(void)
19 {
20 	/*
21 	 * need to to:
22 	 * Check serial flash size. if 2mb evb, else 8mb demo
23 	 */
24 	puts("Board: ");
25 	puts("Freescale M54451 EVB\n");
26 	return 0;
27 };
28 
29 int dram_init(void)
30 {
31 	u32 dramsize;
32 #ifdef CONFIG_CF_SBF
33 	/*
34 	 * Serial Boot: The dram is already initialized in start.S
35 	 * only require to return DRAM size
36 	 */
37 	dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
38 #else
39 	sdramc_t *sdram = (sdramc_t *)(MMAP_SDRAM);
40 	gpio_t *gpio = (gpio_t *)(MMAP_GPIO);
41 	u32 i;
42 
43 	dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
44 
45 	if ((in_be32(&sdram->sdcfg1) == CONFIG_SYS_SDRAM_CFG1) &&
46 	    (in_be32(&sdram->sdcfg2) == CONFIG_SYS_SDRAM_CFG2))
47 		return dramsize;
48 
49 	for (i = 0x13; i < 0x20; i++) {
50 		if (dramsize == (1 << i))
51 			break;
52 	}
53 	i--;
54 
55 	out_8(&gpio->mscr_sdram, CONFIG_SYS_SDRAM_DRV_STRENGTH);
56 
57 	out_be32(&sdram->sdcs0, CONFIG_SYS_SDRAM_BASE | i);
58 
59 	out_be32(&sdram->sdcfg1, CONFIG_SYS_SDRAM_CFG1);
60 	out_be32(&sdram->sdcfg2, CONFIG_SYS_SDRAM_CFG2);
61 
62 	udelay(200);
63 
64 	/* Issue PALL */
65 	out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 2);
66 	__asm__("nop");
67 
68 	/* Perform two refresh cycles */
69 	out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 4);
70 	__asm__("nop");
71 	out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 4);
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_MODE);
78 	__asm__("nop");
79 
80 	out_be32(&sdram->sdcr,
81 		(CONFIG_SYS_SDRAM_CTRL & ~0x80000000) | 0x10000000);
82 
83 	udelay(100);
84 #endif
85 	gd->ram_size = dramsize;
86 
87 	return 0;
88 };
89 
90 int testdram(void)
91 {
92 	/* TODO: XXX XXX XXX */
93 	printf("DRAM test not implemented!\n");
94 
95 	return (0);
96 }
97