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1 | /* |
2 | * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de> | |
6edde024 | 3 | * Copyright (C) 2011, Maarten ter Huurne <maarten@treewalker.org> |
713233fb LPC |
4 | * JZ4740 setup code |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2 of the License, or (at your | |
9 | * option) any later version. | |
10 | * | |
11 | * You should have received a copy of the GNU General Public License along | |
12 | * with this program; if not, write to the Free Software Foundation, Inc., | |
13 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
14 | * | |
15 | */ | |
16 | ||
17 | #include <linux/init.h> | |
6edde024 | 18 | #include <linux/io.h> |
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19 | #include <linux/kernel.h> |
20 | ||
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21 | #include <asm/bootinfo.h> |
22 | ||
23 | #include <asm/mach-jz4740/base.h> | |
24 | ||
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25 | #include "reset.h" |
26 | ||
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27 | |
28 | #define JZ4740_EMC_SDRAM_CTRL 0x80 | |
29 | ||
30 | ||
31 | static void __init jz4740_detect_mem(void) | |
32 | { | |
33 | void __iomem *jz_emc_base; | |
34 | u32 ctrl, bus, bank, rows, cols; | |
35 | phys_t size; | |
36 | ||
37 | jz_emc_base = ioremap(JZ4740_EMC_BASE_ADDR, 0x100); | |
38 | ctrl = readl(jz_emc_base + JZ4740_EMC_SDRAM_CTRL); | |
39 | bus = 2 - ((ctrl >> 31) & 1); | |
40 | bank = 1 + ((ctrl >> 19) & 1); | |
41 | cols = 8 + ((ctrl >> 26) & 7); | |
42 | rows = 11 + ((ctrl >> 20) & 3); | |
43 | printk(KERN_DEBUG | |
44 | "SDRAM preconfigured: bus:%u bank:%u rows:%u cols:%u\n", | |
45 | bus, bank, rows, cols); | |
46 | iounmap(jz_emc_base); | |
47 | ||
48 | size = 1 << (bus + bank + cols + rows); | |
49 | add_memory_region(0, size, BOOT_MEM_RAM); | |
50 | } | |
51 | ||
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52 | void __init plat_mem_setup(void) |
53 | { | |
54 | jz4740_reset_init(); | |
6edde024 | 55 | jz4740_detect_mem(); |
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56 | } |
57 | ||
58 | const char *get_system_type(void) | |
59 | { | |
60 | return "JZ4740"; | |
61 | } |