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) 2004-2007, 2012 Freescale Semiconductor, Inc.
7  * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
8  */
9 
10 #include <common.h>
11 #include <asm/immap.h>
12 #include <asm/io.h>
13 
14 DECLARE_GLOBAL_DATA_PTR;
15 
16 int checkboard(void)
17 {
18 	puts("Board: ");
19 	puts("Freescale M52277 EVB\n");
20 	return 0;
21 };
22 
23 int dram_init(void)
24 {
25 	u32 dramsize;
26 
27 #ifdef CONFIG_CF_SBF
28 	/*
29 	 * Serial Boot: The dram is already initialized in start.S
30 	 * only require to return DRAM size
31 	 */
32 	dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
33 #else
34 	sdramc_t *sdram = (sdramc_t *)(MMAP_SDRAM);
35 	gpio_t *gpio = (gpio_t *)(MMAP_GPIO);
36 	u32 i;
37 
38 	dramsize = CONFIG_SYS_SDRAM_SIZE * 0x100000;
39 
40 	for (i = 0x13; i < 0x20; i++) {
41 		if (dramsize == (1 << i))
42 			break;
43 	}
44 	i--;
45 
46 	out_8(&gpio->mscr_sdram, CONFIG_SYS_SDRAM_DRV_STRENGTH);
47 
48 	out_be32(&sdram->sdcs0, CONFIG_SYS_SDRAM_BASE | i);
49 
50 	out_be32(&sdram->sdcfg1, CONFIG_SYS_SDRAM_CFG1);
51 	out_be32(&sdram->sdcfg2, CONFIG_SYS_SDRAM_CFG2);
52 
53 	/* Issue PALL */
54 	out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 2);
55 	__asm__("nop");
56 
57 	/* Issue LEMR */
58 	out_be32(&sdram->sdmr, CONFIG_SYS_SDRAM_MODE);
59 	__asm__("nop");
60 	out_be32(&sdram->sdmr, CONFIG_SYS_SDRAM_EMOD);
61 	__asm__("nop");
62 
63 	udelay(1000);
64 
65 	/* Issue PALL */
66 	out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 2);
67 	__asm__("nop");
68 
69 	/* Perform two refresh cycles */
70 	out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 4);
71 	__asm__("nop");
72 	out_be32(&sdram->sdcr, CONFIG_SYS_SDRAM_CTRL | 4);
73 	__asm__("nop");
74 
75 	out_be32(&sdram->sdcr,
76 		(CONFIG_SYS_SDRAM_CTRL & ~0x80000000) | 0x10000c00);
77 
78 	udelay(100);
79 #endif
80 	gd->ram_size = dramsize;
81 
82 	return 0;
83 };
84 
85 int testdram(void)
86 {
87 	/* TODO: XXX XXX XXX */
88 	printf("DRAM test not implemented!\n");
89 
90 	return (0);
91 }
92