2 * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
3 * Copyright (C) 2011, Maarten ter Huurne <maarten@treewalker.org>
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.
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.
17 #include <linux/init.h>
19 #include <linux/irqchip.h>
20 #include <linux/kernel.h>
21 #include <linux/libfdt.h>
22 #include <linux/of_fdt.h>
24 #include <asm/bootinfo.h>
27 #include <asm/mach-jz4740/base.h>
32 #define JZ4740_EMC_SDRAM_CTRL 0x80
34 static void __init jz4740_detect_mem(void)
36 void __iomem *jz_emc_base;
37 u32 ctrl, bus, bank, rows, cols;
40 jz_emc_base = ioremap(JZ4740_EMC_BASE_ADDR, 0x100);
41 ctrl = readl(jz_emc_base + JZ4740_EMC_SDRAM_CTRL);
42 bus = 2 - ((ctrl >> 31) & 1);
43 bank = 1 + ((ctrl >> 19) & 1);
44 cols = 8 + ((ctrl >> 26) & 7);
45 rows = 11 + ((ctrl >> 20) & 3);
47 "SDRAM preconfigured: bus:%u bank:%u rows:%u cols:%u\n",
48 bus, bank, rows, cols);
51 size = 1 << (bus + bank + cols + rows);
52 add_memory_region(0, size, BOOT_MEM_RAM);
55 static unsigned long __init get_board_mach_type(const void *fdt)
57 if (!fdt_node_check_compatible(fdt, 0, "ingenic,jz4780"))
58 return MACH_INGENIC_JZ4780;
59 if (!fdt_node_check_compatible(fdt, 0, "ingenic,jz4770"))
60 return MACH_INGENIC_JZ4770;
62 return MACH_INGENIC_JZ4740;
65 void __init plat_mem_setup(void)
72 if (__dtb_start != __dtb_end)
75 dtb = (void *)fw_passed_dtb;
79 offset = fdt_path_offset(dtb, "/memory");
83 mips_machtype = get_board_mach_type(dtb);
86 void __init device_tree_init(void)
88 if (!initial_boot_params)
91 unflatten_and_copy_device_tree();
94 const char *get_system_type(void)
96 switch (mips_machtype) {
97 case MACH_INGENIC_JZ4780:
99 case MACH_INGENIC_JZ4770:
106 void __init arch_init_irq(void)