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arch/mips/jz4740/setup.c
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/* * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de> |
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* Copyright (C) 2011, Maarten ter Huurne <maarten@treewalker.org> |
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* JZ4740 setup code * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 675 Mass Ave, Cambridge, MA 02139, USA. * */ #include <linux/init.h> |
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#include <linux/io.h> |
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#include <linux/kernel.h> |
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#include <asm/bootinfo.h> #include <asm/mach-jz4740/base.h> |
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#include "reset.h" |
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#define JZ4740_EMC_SDRAM_CTRL 0x80 static void __init jz4740_detect_mem(void) { void __iomem *jz_emc_base; u32 ctrl, bus, bank, rows, cols; phys_t size; jz_emc_base = ioremap(JZ4740_EMC_BASE_ADDR, 0x100); ctrl = readl(jz_emc_base + JZ4740_EMC_SDRAM_CTRL); bus = 2 - ((ctrl >> 31) & 1); bank = 1 + ((ctrl >> 19) & 1); cols = 8 + ((ctrl >> 26) & 7); rows = 11 + ((ctrl >> 20) & 3); printk(KERN_DEBUG "SDRAM preconfigured: bus:%u bank:%u rows:%u cols:%u ", bus, bank, rows, cols); iounmap(jz_emc_base); size = 1 << (bus + bank + cols + rows); add_memory_region(0, size, BOOT_MEM_RAM); } |
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void __init plat_mem_setup(void) { jz4740_reset_init(); |
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jz4740_detect_mem(); |
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} const char *get_system_type(void) { return "JZ4740"; } |