1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2000-2003
4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5  *
6  * Copyright (C) 2004-2008, 2012 Freescale Semiconductor, Inc.
7  * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
8  */
9 
10 #include <common.h>
11 #include <spi.h>
12 #include <asm/immap.h>
13 #include <asm/io.h>
14 
15 DECLARE_GLOBAL_DATA_PTR;
16 
17 int checkboard(void)
18 {
19 	/*
20 	 * need to to:
21 	 * Check serial flash size. if 2mb evb, else 8mb demo
22 	 */
23 	puts("Board: ");
24 	puts("Freescale M54451 EVB\n");
25 	return 0;
26 };
27 
28 int dram_init(void)
29 {
30 	u32 dramsize;
31 #ifdef CONFIG_CF_SBF
32 	/*
33 	 * Serial Boot: The dram is already initialized in start.S
34 	 * only require to return DRAM size
35 	 */
36 	dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
37 #else
38 	sdramc_t *sdram = (sdramc_t *)(MMAP_SDRAM);
39 	gpio_t *gpio = (gpio_t *)(MMAP_GPIO);
40 	u32 i;
41 
42 	dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
43 
44 	if ((in_be32(&sdram->sdcfg1) == CONFIG_SYS_SDRAM_CFG1) &&
45 	    (in_be32(&sdram->sdcfg2) == CONFIG_SYS_SDRAM_CFG2))
46 		return dramsize;
47 
48 	for (i = 0x13; i < 0x20; i++) {
49 		if (dramsize == (1 << i))
50 			break;
51 	}
52 	i--;
53 
54 	out_8(&gpio->mscr_sdram, CONFIG_SYS_SDRAM_DRV_STRENGTH);
55 
56 	out_be32(&sdram->sdcs0, CONFIG_SYS_SDRAM_BASE | i);
57 
58 	out_be32(&sdram->sdcfg1, CONFIG_SYS_SDRAM_CFG1);
59 	out_be32(&sdram->sdcfg2, CONFIG_SYS_SDRAM_CFG2);
60 
61 	udelay(200);
62 
63 	/* Issue PALL */
64 	out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 2);
65 	__asm__("nop");
66 
67 	/* Perform two refresh cycles */
68 	out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 4);
69 	__asm__("nop");
70 	out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 4);
71 	__asm__("nop");
72 
73 	/* Issue LEMR */
74 	out_be32(&sdram->sdmr, CONFIG_SYS_SDRAM_MODE);
75 	__asm__("nop");
76 	out_be32(&sdram->sdmr, CONFIG_SYS_SDRAM_MODE);
77 	__asm__("nop");
78 
79 	out_be32(&sdram->sdcr,
80 		(CONFIG_SYS_SDRAM_CTRL & ~0x80000000) | 0x10000000);
81 
82 	udelay(100);
83 #endif
84 	gd->ram_size = dramsize;
85 
86 	return 0;
87 };
88 
89 int testdram(void)
90 {
91 	/* TODO: XXX XXX XXX */
92 	printf("DRAM test not implemented!\n");
93 
94 	return (0);
95 }
96