148 lines
3.8 KiB
C
148 lines
3.8 KiB
C
/*
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* Procedures for creating, accessing and interpreting the device tree.
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*
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* Paul Mackerras August 1996.
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* Copyright (C) 1996-2005 Paul Mackerras.
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*
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* Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
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* {engebret|bergner}@us.ibm.com
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <stdarg.h>
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#include <linux/export.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/threads.h>
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#include <linux/spinlock.h>
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#include <linux/types.h>
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#include <linux/pci.h>
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#include <linux/stringify.h>
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#include <linux/delay.h>
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#include <linux/initrd.h>
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#include <linux/bitops.h>
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#include <linux/kexec.h>
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#include <linux/debugfs.h>
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#include <linux/irq.h>
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#include <linux/memblock.h>
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#include <linux/of_fdt.h>
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#include <asm/prom.h>
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#include <asm/page.h>
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#include <asm/processor.h>
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#include <asm/irq.h>
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#include <linux/io.h>
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#include <asm/mmu.h>
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#include <asm/pgtable.h>
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#include <asm/sections.h>
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#include <asm/pci-bridge.h>
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#ifdef CONFIG_EARLY_PRINTK
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static char *stdout;
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static int __init early_init_dt_scan_chosen_serial(unsigned long node,
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const char *uname, int depth, void *data)
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{
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unsigned long l;
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char *p;
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pr_debug("%s: depth: %d, uname: %s\n", __func__, depth, uname);
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if (depth == 1 && (strcmp(uname, "chosen") == 0 ||
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strcmp(uname, "chosen@0") == 0)) {
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p = of_get_flat_dt_prop(node, "linux,stdout-path", &l);
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if (p != NULL && l > 0)
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stdout = p; /* store pointer to stdout-path */
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}
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if (stdout && strstr(stdout, uname)) {
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p = of_get_flat_dt_prop(node, "compatible", &l);
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pr_debug("Compatible string: %s\n", p);
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if ((strncmp(p, "xlnx,xps-uart16550", 18) == 0) ||
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(strncmp(p, "xlnx,axi-uart16550", 18) == 0)) {
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unsigned int addr;
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*(u32 *)data = UART16550;
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addr = *(u32 *)of_get_flat_dt_prop(node, "reg", &l);
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addr += *(u32 *)of_get_flat_dt_prop(node,
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"reg-offset", &l);
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/* clear register offset */
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return be32_to_cpu(addr) & ~3;
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}
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if ((strncmp(p, "xlnx,xps-uartlite", 17) == 0) ||
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(strncmp(p, "xlnx,opb-uartlite", 17) == 0) ||
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(strncmp(p, "xlnx,axi-uartlite", 17) == 0) ||
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(strncmp(p, "xlnx,mdm", 8) == 0)) {
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unsigned int *addrp;
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*(u32 *)data = UARTLITE;
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addrp = of_get_flat_dt_prop(node, "reg", &l);
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return be32_to_cpup(addrp); /* return address */
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}
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}
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return 0;
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}
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/* this function is looking for early console - Microblaze specific */
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int __init of_early_console(void *version)
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{
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return of_scan_flat_dt(early_init_dt_scan_chosen_serial, version);
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}
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#endif
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void __init early_init_devtree(void *params)
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{
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pr_debug(" -> early_init_devtree(%p)\n", params);
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early_init_dt_scan(params);
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if (!strlen(boot_command_line))
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strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
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parse_early_param();
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memblock_allow_resize();
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pr_debug("Phys. mem: %lx\n", (unsigned long) memblock_phys_mem_size());
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pr_debug(" <- early_init_devtree()\n");
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}
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/*******
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*
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* New implementation of the OF "find" APIs, return a refcounted
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* object, call of_node_put() when done. The device tree and list
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* are protected by a rw_lock.
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*
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* Note that property management will need some locking as well,
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* this isn't dealt with yet.
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*
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*******/
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#if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
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static struct debugfs_blob_wrapper flat_dt_blob;
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static int __init export_flat_device_tree(void)
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{
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struct dentry *d;
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flat_dt_blob.data = initial_boot_params;
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flat_dt_blob.size = initial_boot_params->totalsize;
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d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
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of_debugfs_root, &flat_dt_blob);
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if (!d)
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return 1;
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return 0;
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}
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device_initcall(export_flat_device_tree);
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#endif
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