1 /* 2 * Device tree support 3 * 4 * Copyright (C) 2013, 2015 Altera Corporation 5 * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw> 6 * 7 * Based on MIPS support for CONFIG_OF device tree support 8 * 9 * Copyright (C) 2010 Cisco Systems Inc. <dediao@cisco.com> 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * (at your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 * GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program. If not, see <http://www.gnu.org/licenses/>. 23 * 24 */ 25 26 #include <linux/init.h> 27 #include <linux/types.h> 28 #include <linux/bootmem.h> 29 #include <linux/of.h> 30 #include <linux/of_fdt.h> 31 #include <linux/io.h> 32 33 #include <asm/prom.h> 34 #include <asm/sections.h> 35 36 void __init early_init_dt_add_memory_arch(u64 base, u64 size) 37 { 38 u64 kernel_start = (u64)virt_to_phys(_text); 39 40 if (!memory_size && 41 (kernel_start >= base) && (kernel_start < (base + size))) 42 memory_size = size; 43 44 } 45 46 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align) 47 { 48 return alloc_bootmem_align(size, align); 49 } 50 51 void __init early_init_devtree(void *params) 52 { 53 __be32 *dtb = (u32 *)__dtb_start; 54 #if defined(CONFIG_NIOS2_DTB_AT_PHYS_ADDR) 55 if (be32_to_cpup((__be32 *)CONFIG_NIOS2_DTB_PHYS_ADDR) == 56 OF_DT_HEADER) { 57 params = (void *)CONFIG_NIOS2_DTB_PHYS_ADDR; 58 early_init_dt_scan(params); 59 return; 60 } 61 #endif 62 if (be32_to_cpu((__be32) *dtb) == OF_DT_HEADER) 63 params = (void *)__dtb_start; 64 65 early_init_dt_scan(params); 66 } 67 68 #ifdef CONFIG_EARLY_PRINTK 69 static int __init early_init_dt_scan_serial(unsigned long node, 70 const char *uname, int depth, void *data) 71 { 72 u64 *addr64 = (u64 *) data; 73 const char *p; 74 75 /* only consider serial nodes */ 76 if (strncmp(uname, "serial", 6) != 0) 77 return 0; 78 79 p = of_get_flat_dt_prop(node, "compatible", NULL); 80 if (!p) 81 return 0; 82 83 /* 84 * We found an altera_jtaguart but it wasn't configured for console, so 85 * skip it. 86 */ 87 #ifndef CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE 88 if (strncmp(p, "altr,juart", 10) == 0) 89 return 0; 90 #endif 91 92 /* 93 * Same for altera_uart. 94 */ 95 #ifndef CONFIG_SERIAL_ALTERA_UART_CONSOLE 96 if (strncmp(p, "altr,uart", 9) == 0) 97 return 0; 98 #endif 99 100 *addr64 = of_flat_dt_translate_address(node); 101 102 return *addr64 == OF_BAD_ADDR ? 0 : 1; 103 } 104 105 unsigned long __init of_early_console(void) 106 { 107 u64 base = 0; 108 109 if (of_scan_flat_dt(early_init_dt_scan_serial, &base)) 110 return (u32)ioremap(base, 32); 111 else 112 return 0; 113 } 114 #endif /* CONFIG_EARLY_PRINTK */ 115