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/*
* Procedures for creating, accessing and interpreting the device tree.
*
* Paul Mackerras August 1996.
* Copyright (C) 1996-2005 Paul Mackerras.
*
* Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
* {engebret|bergner}@us.ibm.com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <stdarg.h>
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/threads.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/stringify.h>
#include <linux/delay.h>
#include <linux/initrd.h>
#include <linux/bitops.h>
#include <linux/kexec.h>
#include <linux/debugfs.h>
#include <linux/irq.h>
#include <linux/memblock.h>
#include <asm/prom.h>
#include <asm/page.h>
#include <asm/processor.h>
#include <asm/irq.h>
#include <linux/io.h>
#include <asm/mmu.h>
#include <asm/pgtable.h>
#include <asm/sections.h>
#include <asm/pci-bridge.h>
#ifdef CONFIG_EARLY_PRINTK
static char *stdout;
static int __init early_init_dt_scan_chosen_serial(unsigned long node,
const char *uname, int depth, void *data)
{
unsigned long l;
char *p;
pr_debug("%s: depth: %d, uname: %s\n", __func__, depth, uname);
if (depth == 1 && (strcmp(uname, "chosen") == 0 ||
strcmp(uname, "chosen@0") == 0)) {
p = of_get_flat_dt_prop(node, "linux,stdout-path", &l);
if (p != NULL && l > 0)
stdout = p; /* store pointer to stdout-path */
}
if (stdout && strstr(stdout, uname)) {
p = of_get_flat_dt_prop(node, "compatible", &l);
pr_debug("Compatible string: %s\n", p);
if ((strncmp(p, "xlnx,xps-uart16550", 18) == 0) ||
(strncmp(p, "xlnx,axi-uart16550", 18) == 0)) {
unsigned int addr;
*(u32 *)data = UART16550;
addr = *(u32 *)of_get_flat_dt_prop(node, "reg", &l);
addr += *(u32 *)of_get_flat_dt_prop(node,
"reg-offset", &l);
/* clear register offset */
return be32_to_cpu(addr) & ~3;
}
if ((strncmp(p, "xlnx,xps-uartlite", 17) == 0) ||
(strncmp(p, "xlnx,opb-uartlite", 17) == 0) ||
(strncmp(p, "xlnx,axi-uartlite", 17) == 0) ||
(strncmp(p, "xlnx,mdm", 8) == 0)) {
unsigned int *addrp;
*(u32 *)data = UARTLITE;
addrp = of_get_flat_dt_prop(node, "reg", &l);
return be32_to_cpup(addrp); /* return address */
}
}
return 0;
}
/* this function is looking for early console - Microblaze specific */
int __init of_early_console(void *version)
{
return of_scan_flat_dt(early_init_dt_scan_chosen_serial, version);
}
#endif
void __init early_init_devtree(void *params)
{
pr_debug(" -> early_init_devtree(%p)\n", params);
early_init_dt_scan(params);
if (!strlen(boot_command_line))
strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
parse_early_param();
memblock_allow_resize();
pr_debug("Phys. mem: %lx\n", (unsigned long) memblock_phys_mem_size());
pr_debug(" <- early_init_devtree()\n");
}
#ifdef CONFIG_BLK_DEV_INITRD
void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
{
initrd_start = (unsigned long)__va(start);
initrd_end = (unsigned long)__va(end);
initrd_below_start_ok = 1;
}
#endif
/*******
*
* New implementation of the OF "find" APIs, return a refcounted
* object, call of_node_put() when done. The device tree and list
* are protected by a rw_lock.
*
* Note that property management will need some locking as well,
* this isn't dealt with yet.
*
*******/
#if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
static struct debugfs_blob_wrapper flat_dt_blob;
static int __init export_flat_device_tree(void)
{
struct dentry *d;
flat_dt_blob.data = initial_boot_params;
flat_dt_blob.size = initial_boot_params->totalsize;
d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
of_debugfs_root, &flat_dt_blob);
if (!d)
return 1;
return 0;
}
device_initcall(export_flat_device_tree);
#endif
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