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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 }