6016a363f6
In struct device_node, the phandle is named 'linux_phandle' for PowerPC and MicroBlaze, and 'node' for SPARC. There is no good reason for the difference, it is just an artifact of the code diverging over a couple of years. This patch renames both to simply .phandle. Note: the .node also existed in PowerPC/MicroBlaze, but the only user seems to be arch/powerpc/platforms/powermac/pfunc_core.c. It doesn't look like the assignment between .linux_phandle and .node is significantly different enough to warrant the separate code paths unless ibm,phandle properties actually appear in Apple device trees. I think it is safe to eliminate the old .node property and use phandle everywhere. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: David S. Miller <davem@davemloft.net> Tested-by: Wolfram Sang <w.sang@pengutronix.de> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
431 lines
11 KiB
C
431 lines
11 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/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/module.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/lmb.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/system.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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/* export that to outside world */
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struct device_node *of_chosen;
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#define early_init_dt_scan_drconf_memory(node) 0
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static int __init early_init_dt_scan_cpus(unsigned long node,
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const char *uname, int depth,
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void *data)
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{
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static int logical_cpuid;
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char *type = of_get_flat_dt_prop(node, "device_type", NULL);
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const u32 *intserv;
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int i, nthreads;
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int found = 0;
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/* We are scanning "cpu" nodes only */
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if (type == NULL || strcmp(type, "cpu") != 0)
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return 0;
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/* Get physical cpuid */
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intserv = of_get_flat_dt_prop(node, "reg", NULL);
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nthreads = 1;
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/*
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* Now see if any of these threads match our boot cpu.
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* NOTE: This must match the parsing done in smp_setup_cpu_maps.
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*/
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for (i = 0; i < nthreads; i++) {
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/*
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* version 2 of the kexec param format adds the phys cpuid of
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* booted proc.
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*/
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if (initial_boot_params && initial_boot_params->version >= 2) {
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if (intserv[i] ==
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initial_boot_params->boot_cpuid_phys) {
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found = 1;
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break;
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}
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} else {
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/*
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* Check if it's the boot-cpu, set it's hw index now,
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* unfortunately this format did not support booting
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* off secondary threads.
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*/
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if (of_get_flat_dt_prop(node,
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"linux,boot-cpu", NULL) != NULL) {
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found = 1;
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break;
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}
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}
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#ifdef CONFIG_SMP
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/* logical cpu id is always 0 on UP kernels */
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logical_cpuid++;
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#endif
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}
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if (found) {
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pr_debug("boot cpu: logical %d physical %d\n", logical_cpuid,
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intserv[i]);
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boot_cpuid = logical_cpuid;
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}
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return 0;
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}
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void __init early_init_dt_scan_chosen_arch(unsigned long node)
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{
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/* No Microblaze specific code here */
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}
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static int __init early_init_dt_scan_memory(unsigned long node,
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const char *uname, int depth, void *data)
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{
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char *type = of_get_flat_dt_prop(node, "device_type", NULL);
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__be32 *reg, *endp;
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unsigned long l;
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/* Look for the ibm,dynamic-reconfiguration-memory node */
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/* if (depth == 1 &&
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strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0)
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return early_init_dt_scan_drconf_memory(node);
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*/
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/* We are scanning "memory" nodes only */
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if (type == NULL) {
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/*
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* The longtrail doesn't have a device_type on the
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* /memory node, so look for the node called /memory@0.
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*/
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if (depth != 1 || strcmp(uname, "memory@0") != 0)
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return 0;
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} else if (strcmp(type, "memory") != 0)
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return 0;
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reg = (__be32 *)of_get_flat_dt_prop(node, "linux,usable-memory", &l);
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if (reg == NULL)
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reg = (__be32 *)of_get_flat_dt_prop(node, "reg", &l);
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if (reg == NULL)
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return 0;
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endp = reg + (l / sizeof(__be32));
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pr_debug("memory scan node %s, reg size %ld, data: %x %x %x %x,\n",
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uname, l, reg[0], reg[1], reg[2], reg[3]);
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while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
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u64 base, size;
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base = dt_mem_next_cell(dt_root_addr_cells, ®);
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size = dt_mem_next_cell(dt_root_size_cells, ®);
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if (size == 0)
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continue;
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pr_debug(" - %llx , %llx\n", (unsigned long long)base,
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(unsigned long long)size);
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lmb_add(base, size);
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}
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return 0;
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}
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#ifdef CONFIG_PHYP_DUMP
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/**
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* phyp_dump_calculate_reserve_size() - reserve variable boot area 5% or arg
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*
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* Function to find the largest size we need to reserve
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* during early boot process.
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*
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* It either looks for boot param and returns that OR
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* returns larger of 256 or 5% rounded down to multiples of 256MB.
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*
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*/
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static inline unsigned long phyp_dump_calculate_reserve_size(void)
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{
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unsigned long tmp;
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if (phyp_dump_info->reserve_bootvar)
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return phyp_dump_info->reserve_bootvar;
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/* divide by 20 to get 5% of value */
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tmp = lmb_end_of_DRAM();
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do_div(tmp, 20);
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/* round it down in multiples of 256 */
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tmp = tmp & ~0x0FFFFFFFUL;
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return (tmp > PHYP_DUMP_RMR_END ? tmp : PHYP_DUMP_RMR_END);
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}
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/**
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* phyp_dump_reserve_mem() - reserve all not-yet-dumped mmemory
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*
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* This routine may reserve memory regions in the kernel only
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* if the system is supported and a dump was taken in last
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* boot instance or if the hardware is supported and the
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* scratch area needs to be setup. In other instances it returns
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* without reserving anything. The memory in case of dump being
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* active is freed when the dump is collected (by userland tools).
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*/
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static void __init phyp_dump_reserve_mem(void)
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{
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unsigned long base, size;
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unsigned long variable_reserve_size;
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if (!phyp_dump_info->phyp_dump_configured) {
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printk(KERN_ERR "Phyp-dump not supported on this hardware\n");
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return;
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}
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if (!phyp_dump_info->phyp_dump_at_boot) {
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printk(KERN_INFO "Phyp-dump disabled at boot time\n");
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return;
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}
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variable_reserve_size = phyp_dump_calculate_reserve_size();
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if (phyp_dump_info->phyp_dump_is_active) {
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/* Reserve *everything* above RMR.Area freed by userland tools*/
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base = variable_reserve_size;
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size = lmb_end_of_DRAM() - base;
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/* XXX crashed_ram_end is wrong, since it may be beyond
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* the memory_limit, it will need to be adjusted. */
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lmb_reserve(base, size);
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phyp_dump_info->init_reserve_start = base;
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phyp_dump_info->init_reserve_size = size;
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} else {
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size = phyp_dump_info->cpu_state_size +
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phyp_dump_info->hpte_region_size +
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variable_reserve_size;
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base = lmb_end_of_DRAM() - size;
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lmb_reserve(base, size);
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phyp_dump_info->init_reserve_start = base;
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phyp_dump_info->init_reserve_size = size;
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}
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}
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#else
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static inline void __init phyp_dump_reserve_mem(void) {}
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#endif /* CONFIG_PHYP_DUMP && CONFIG_PPC_RTAS */
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#ifdef CONFIG_EARLY_PRINTK
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/* MS this is Microblaze specifig function */
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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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unsigned long l;
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char *p;
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int *addr;
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pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
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/* find all serial nodes */
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if (strncmp(uname, "serial", 6) != 0)
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return 0;
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early_init_dt_check_for_initrd(node);
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/* find compatible node with uartlite */
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p = of_get_flat_dt_prop(node, "compatible", &l);
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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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return 0;
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addr = of_get_flat_dt_prop(node, "reg", &l);
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return *addr; /* return address */
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}
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/* this function is looking for early uartlite console - Microblaze specific */
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int __init early_uartlite_console(void)
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{
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return of_scan_flat_dt(early_init_dt_scan_serial, NULL);
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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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/* Setup flat device-tree pointer */
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initial_boot_params = params;
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#ifdef CONFIG_PHYP_DUMP
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/* scan tree to see if dump occured during last boot */
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of_scan_flat_dt(early_init_dt_scan_phyp_dump, NULL);
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#endif
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/* Retrieve various informations from the /chosen node of the
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* device-tree, including the platform type, initrd location and
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* size, TCE reserve, and more ...
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*/
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of_scan_flat_dt(early_init_dt_scan_chosen, NULL);
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/* Scan memory nodes and rebuild LMBs */
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lmb_init();
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of_scan_flat_dt(early_init_dt_scan_root, NULL);
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of_scan_flat_dt(early_init_dt_scan_memory, NULL);
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/* Save command line for /proc/cmdline and then parse parameters */
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strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
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parse_early_param();
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lmb_analyze();
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pr_debug("Phys. mem: %lx\n", (unsigned long) lmb_phys_mem_size());
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pr_debug("Scanning CPUs ...\n");
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/* Retreive CPU related informations from the flat tree
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* (altivec support, boot CPU ID, ...)
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*/
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of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
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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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/**
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* of_find_node_by_phandle - Find a node given a phandle
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* @handle: phandle of the node to find
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*
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* Returns a node pointer with refcount incremented, use
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* of_node_put() on it when done.
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*/
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struct device_node *of_find_node_by_phandle(phandle handle)
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{
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struct device_node *np;
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read_lock(&devtree_lock);
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for (np = allnodes; np != NULL; np = np->allnext)
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if (np->phandle == handle)
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break;
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of_node_get(np);
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read_unlock(&devtree_lock);
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return np;
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}
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EXPORT_SYMBOL(of_find_node_by_phandle);
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/*
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* Plug a device node into the tree and global list.
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*/
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void of_attach_node(struct device_node *np)
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{
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unsigned long flags;
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write_lock_irqsave(&devtree_lock, flags);
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np->sibling = np->parent->child;
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np->allnext = allnodes;
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np->parent->child = np;
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allnodes = np;
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write_unlock_irqrestore(&devtree_lock, flags);
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}
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/*
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* "Unplug" a node from the device tree. The caller must hold
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* a reference to the node. The memory associated with the node
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* is not freed until its refcount goes to zero.
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*/
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void of_detach_node(struct device_node *np)
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{
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struct device_node *parent;
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unsigned long flags;
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write_lock_irqsave(&devtree_lock, flags);
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parent = np->parent;
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if (!parent)
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goto out_unlock;
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if (allnodes == np)
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allnodes = np->allnext;
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else {
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struct device_node *prev;
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for (prev = allnodes;
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prev->allnext != np;
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prev = prev->allnext)
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;
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prev->allnext = np->allnext;
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}
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if (parent->child == np)
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parent->child = np->sibling;
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else {
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struct device_node *prevsib;
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for (prevsib = np->parent->child;
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prevsib->sibling != np;
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prevsib = prevsib->sibling)
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;
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prevsib->sibling = np->sibling;
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}
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of_node_set_flag(np, OF_DETACHED);
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out_unlock:
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write_unlock_irqrestore(&devtree_lock, flags);
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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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