projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 95acd4c7 LFT |
1 | /* |
| 2 | * Device tree support | |
| 3 | * | |
| e8bf5bc7 | 4 | * Copyright (C) 2013, 2015 Altera Corporation |
| 95acd4c7 LFT |
5 | * Copyright (C) 2010 Thomas Chou <[email protected]> |
| 6 | * | |
| 7 | * Based on MIPS support for CONFIG_OF device tree support | |
| 8 | * | |
| 9 | * Copyright (C) 2010 Cisco Systems Inc. <[email protected]> | |
| 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 | ||
| e8bf5bc7 | 33 | #include <asm/prom.h> |
| 95acd4c7 LFT |
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 | } | |
| e8bf5bc7 LFT |
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 = fdt_translate_address((const void *)initial_boot_params, | |
| 101 | node); | |
| 102 | ||
| 103 | return *addr64 == OF_BAD_ADDR ? 0 : 1; | |
| 104 | } | |
| 105 | ||
| 106 | unsigned long __init of_early_console(void) | |
| 107 | { | |
| 108 | u64 base = 0; | |
| 109 | ||
| 110 | if (of_scan_flat_dt(early_init_dt_scan_serial, &base)) | |
| 111 | return (u32)ioremap(base, 32); | |
| 112 | else | |
| 113 | return 0; | |
| 114 | } | |
| 115 | #endif /* CONFIG_EARLY_PRINTK */ |