115 lines
2.8 KiB
C
115 lines
2.8 KiB
C
/*
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* Device tree support
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*
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* Copyright (C) 2013, 2015 Altera Corporation
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* Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
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*
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* Based on MIPS support for CONFIG_OF device tree support
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*
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* Copyright (C) 2010 Cisco Systems Inc. <dediao@cisco.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/bootmem.h>
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#include <linux/of.h>
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#include <linux/of_fdt.h>
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#include <linux/io.h>
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#include <asm/prom.h>
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#include <asm/sections.h>
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void __init early_init_dt_add_memory_arch(u64 base, u64 size)
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{
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u64 kernel_start = (u64)virt_to_phys(_text);
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if (!memory_size &&
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(kernel_start >= base) && (kernel_start < (base + size)))
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memory_size = size;
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}
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void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
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{
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return alloc_bootmem_align(size, align);
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}
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void __init early_init_devtree(void *params)
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{
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__be32 *dtb = (u32 *)__dtb_start;
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#if defined(CONFIG_NIOS2_DTB_AT_PHYS_ADDR)
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if (be32_to_cpup((__be32 *)CONFIG_NIOS2_DTB_PHYS_ADDR) ==
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OF_DT_HEADER) {
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params = (void *)CONFIG_NIOS2_DTB_PHYS_ADDR;
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early_init_dt_scan(params);
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return;
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}
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#endif
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if (be32_to_cpu((__be32) *dtb) == OF_DT_HEADER)
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params = (void *)__dtb_start;
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early_init_dt_scan(params);
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}
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#ifdef CONFIG_EARLY_PRINTK
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static int __init early_init_dt_scan_serial(unsigned long node,
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const char *uname, int depth, void *data)
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{
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u64 *addr64 = (u64 *) data;
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const char *p;
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/* only consider serial nodes */
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if (strncmp(uname, "serial", 6) != 0)
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return 0;
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p = of_get_flat_dt_prop(node, "compatible", NULL);
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if (!p)
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return 0;
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/*
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* We found an altera_jtaguart but it wasn't configured for console, so
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* skip it.
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*/
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#ifndef CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE
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if (strncmp(p, "altr,juart", 10) == 0)
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return 0;
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#endif
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/*
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* Same for altera_uart.
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*/
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#ifndef CONFIG_SERIAL_ALTERA_UART_CONSOLE
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if (strncmp(p, "altr,uart", 9) == 0)
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return 0;
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#endif
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*addr64 = of_flat_dt_translate_address(node);
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return *addr64 == OF_BAD_ADDR ? 0 : 1;
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}
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unsigned long __init of_early_console(void)
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{
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u64 base = 0;
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if (of_scan_flat_dt(early_init_dt_scan_serial, &base))
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return (u32)ioremap(base, 32);
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else
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return 0;
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}
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#endif /* CONFIG_EARLY_PRINTK */
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