1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
4 * Copyright (C) 2011, Maarten ter Huurne <maarten@treewalker.org>
8 #include <linux/init.h>
10 #include <linux/irqchip.h>
11 #include <linux/kernel.h>
12 #include <linux/libfdt.h>
13 #include <linux/of_fdt.h>
15 #include <asm/bootinfo.h>
18 #include <asm/mach-jz4740/base.h>
23 #define JZ4740_EMC_SDRAM_CTRL 0x80
25 static void __init jz4740_detect_mem(void)
27 void __iomem *jz_emc_base;
28 u32 ctrl, bus, bank, rows, cols;
31 jz_emc_base = ioremap(JZ4740_EMC_BASE_ADDR, 0x100);
32 ctrl = readl(jz_emc_base + JZ4740_EMC_SDRAM_CTRL);
33 bus = 2 - ((ctrl >> 31) & 1);
34 bank = 1 + ((ctrl >> 19) & 1);
35 cols = 8 + ((ctrl >> 26) & 7);
36 rows = 11 + ((ctrl >> 20) & 3);
38 "SDRAM preconfigured: bus:%u bank:%u rows:%u cols:%u\n",
39 bus, bank, rows, cols);
42 size = 1 << (bus + bank + cols + rows);
43 add_memory_region(0, size, BOOT_MEM_RAM);
46 static unsigned long __init get_board_mach_type(const void *fdt)
48 if (!fdt_node_check_compatible(fdt, 0, "ingenic,jz4780"))
49 return MACH_INGENIC_JZ4780;
50 if (!fdt_node_check_compatible(fdt, 0, "ingenic,jz4770"))
51 return MACH_INGENIC_JZ4770;
53 return MACH_INGENIC_JZ4740;
56 void __init plat_mem_setup(void)
63 if (__dtb_start != __dtb_end)
66 dtb = (void *)fw_passed_dtb;
70 offset = fdt_path_offset(dtb, "/memory");
74 mips_machtype = get_board_mach_type(dtb);
77 void __init device_tree_init(void)
79 if (!initial_boot_params)
82 unflatten_and_copy_device_tree();
85 const char *get_system_type(void)
87 switch (mips_machtype) {
88 case MACH_INGENIC_JZ4780:
90 case MACH_INGENIC_JZ4770:
97 void __init arch_init_irq(void)