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83d290c5 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
5fb17030 IY |
2 | /* |
3 | * Copyright (C) 2007 Freescale Semiconductor, Inc. | |
4 | * Copyright (C) 2010 Ilya Yanok, Emcraft Systems, yanok@emcraft.com | |
5 | * | |
6 | * Authors: Nick.Spence@freescale.com | |
7 | * Wilson.Lo@freescale.com | |
8 | * scottwood@freescale.com | |
9 | * | |
10 | * This files is mostly identical to the original from | |
11 | * board\freescale\mpc8315erdb\sdram.c | |
5fb17030 IY |
12 | */ |
13 | ||
14 | #include <common.h> | |
15 | #include <mpc83xx.h> | |
16 | ||
17 | #include <asm/bitops.h> | |
18 | #include <asm/io.h> | |
19 | ||
20 | #include <asm/processor.h> | |
21 | ||
22 | DECLARE_GLOBAL_DATA_PTR; | |
23 | ||
5fb17030 IY |
24 | /* Fixed sdram init -- doesn't use serial presence detect. |
25 | * | |
26 | * This is useful for faster booting in configs where the RAM is unlikely | |
27 | * to be changed, or for things like NAND booting where space is tight. | |
28 | */ | |
29 | static long fixed_sdram(void) | |
30 | { | |
31 | immap_t *im = (immap_t *)CONFIG_SYS_IMMR; | |
32 | u32 msize = CONFIG_SYS_DDR_SIZE * 1024 * 1024; | |
33 | u32 msize_log2 = __ilog2(msize); | |
34 | ||
35 | out_be32(&im->sysconf.ddrlaw[0].bar, | |
36 | CONFIG_SYS_DDR_SDRAM_BASE & 0xfffff000); | |
37 | out_be32(&im->sysconf.ddrlaw[0].ar, LBLAWAR_EN | (msize_log2 - 1)); | |
38 | out_be32(&im->sysconf.ddrcdr, CONFIG_SYS_DDRCDR_VALUE); | |
39 | ||
5fb17030 IY |
40 | out_be32(&im->ddr.csbnds[0].csbnds, (msize - 1) >> 24); |
41 | out_be32(&im->ddr.cs_config[0], CONFIG_SYS_DDR_CS0_CONFIG); | |
42 | ||
43 | /* Currently we use only one CS, so disable the other bank. */ | |
44 | out_be32(&im->ddr.cs_config[1], 0); | |
45 | ||
46 | out_be32(&im->ddr.sdram_clk_cntl, CONFIG_SYS_DDR_SDRAM_CLK_CNTL); | |
47 | out_be32(&im->ddr.timing_cfg_3, CONFIG_SYS_DDR_TIMING_3); | |
48 | out_be32(&im->ddr.timing_cfg_1, CONFIG_SYS_DDR_TIMING_1); | |
49 | out_be32(&im->ddr.timing_cfg_2, CONFIG_SYS_DDR_TIMING_2); | |
50 | out_be32(&im->ddr.timing_cfg_0, CONFIG_SYS_DDR_TIMING_0); | |
51 | ||
65ea7589 | 52 | out_be32(&im->ddr.sdram_cfg, CONFIG_SYS_DDR_SDRAM_CFG); |
5fb17030 IY |
53 | out_be32(&im->ddr.sdram_cfg2, CONFIG_SYS_DDR_SDRAM_CFG2); |
54 | out_be32(&im->ddr.sdram_mode, CONFIG_SYS_DDR_MODE); | |
55 | out_be32(&im->ddr.sdram_mode2, CONFIG_SYS_DDR_MODE2); | |
56 | ||
57 | out_be32(&im->ddr.sdram_interval, CONFIG_SYS_DDR_INTERVAL); | |
58 | sync(); | |
59 | ||
60 | /* enable DDR controller */ | |
61 | setbits_be32(&im->ddr.sdram_cfg, SDRAM_CFG_MEM_EN); | |
62 | sync(); | |
63 | ||
64 | return get_ram_size(CONFIG_SYS_DDR_SDRAM_BASE, msize); | |
65 | } | |
66 | ||
f1683aa7 | 67 | int dram_init(void) |
5fb17030 IY |
68 | { |
69 | immap_t *im = (immap_t *)CONFIG_SYS_IMMR; | |
70 | u32 msize; | |
71 | ||
72 | if ((in_be32(&im->sysconf.immrbar) & IMMRBAR_BASE_ADDR) != (u32)im) | |
088454cd | 73 | return -ENXIO; |
5fb17030 IY |
74 | |
75 | /* DDR SDRAM */ | |
76 | msize = fixed_sdram(); | |
77 | ||
5fb17030 | 78 | /* return total bus SDRAM size(bytes) -- DDR */ |
088454cd SG |
79 | gd->ram_size = msize; |
80 | ||
81 | return 0; | |
5fb17030 | 82 | } |