2 * (C) Copyright 2000-2003
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * Copyright (C) 2005-2008 Arthur Shipkowski (art@videon-central.com)
7 * Copyright (C) 2012 Freescale Semiconductor, Inc. All Rights Reserved.
9 * SPDX-License-Identifier: GPL-2.0+
13 #include <asm/immap.h>
16 #define PERIOD 13 /* system bus period in ns */
17 #define SDRAM_TREFI 7800 /* in ns */
22 puts("Freescale MCF5275 EVB\n");
26 phys_size_t initdram(int board_type)
28 sdramctrl_t *sdp = (sdramctrl_t *)(MMAP_SDRAM);
29 gpio_t *gpio_reg = (gpio_t *)(MMAP_GPIO);
32 out_be16(&gpio_reg->par_sdram, 0x3FF);
34 /* Set up chip select */
35 out_be32(&sdp->sdbar0, CONFIG_SYS_SDRAM_BASE);
36 out_be32(&sdp->sdbmr0, MCF_SDRAMC_SDMRn_BAM_32M | MCF_SDRAMC_SDMRn_V);
39 out_be32(&sdp->sdcfg1, 0x83711630);
40 out_be32(&sdp->sdcfg2, 0x46770000);
43 out_be32(&sdp->sdcr, MCF_SDRAMC_SDCR_MODE_EN | MCF_SDRAMC_SDCR_CKE);
46 setbits_be32(&sdp->sdcr, MCF_SDRAMC_SDCR_IPALL);
48 /* Dummy write to start SDRAM */
49 *((volatile unsigned long *)CONFIG_SYS_SDRAM_BASE) = 0xa5a59696;
52 setbits_be32(&sdp->sdmr,
53 MCF_SDRAMC_SDMR_BNKAD_LEMR | MCF_SDRAMC_SDMR_AD(0x0) |
55 *((volatile unsigned long *)CONFIG_SYS_SDRAM_BASE) = 0xa5a59696;
58 out_be32(&sdp->sdmr, 0x058d0000);
59 *((volatile unsigned long *)CONFIG_SYS_SDRAM_BASE) = 0xa5a59696;
61 /* Stop sending commands */
62 clrbits_be32(&sdp->sdmr, MCF_SDRAMC_SDMR_CMD);
65 setbits_be32(&sdp->sdcr, MCF_SDRAMC_SDCR_IPALL);
66 *((volatile unsigned long *)CONFIG_SYS_SDRAM_BASE) = 0xa5a59696;
68 /* Stop manual precharge, send 2 IREF */
69 clrbits_be32(&sdp->sdcr, MCF_SDRAMC_SDCR_IPALL);
70 setbits_be32(&sdp->sdcr, MCF_SDRAMC_SDCR_IREF);
71 *((volatile unsigned long *)CONFIG_SYS_SDRAM_BASE) = 0xa5a59696;
72 *((volatile unsigned long *)CONFIG_SYS_SDRAM_BASE) = 0xa5a59696;
75 out_be32(&sdp->sdmr, 0x018d0000);
76 *((volatile unsigned long *)CONFIG_SYS_SDRAM_BASE) = 0xa5a59696;
78 /* Stop sending commands */
79 clrbits_be32(&sdp->sdmr, MCF_SDRAMC_SDMR_CMD);
80 clrbits_be32(&sdp->sdcr, MCF_SDRAMC_SDCR_MODE_EN);
82 /* Turn on auto refresh, lock SDMR */
86 | MCF_SDRAMC_SDCR_MUX(1)
87 /* 1 added to round up */
88 | MCF_SDRAMC_SDCR_RCNT((SDRAM_TREFI/(PERIOD*64)) - 1 + 1)
89 | MCF_SDRAMC_SDCR_DQS_OE(0x3));
91 return CONFIG_SYS_SDRAM_SIZE * 1024 * 1024;
96 /* TODO: XXX XXX XXX */
97 printf("DRAM test not implemented!\n");