6e1af384f1
dt_xlate_reg() uses the ranges properties of a node's parentage to find the absolute physical address of the node's registers. The ns16550 driver uses this when no virtual-reg property is found. Signed-off-by: Scott Wood <scottwood@freescale.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
290 lines
6.5 KiB
C
290 lines
6.5 KiB
C
/*
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* devtree.c - convenience functions for device tree manipulation
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* Copyright 2007 David Gibson, IBM Corporation.
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* Copyright (c) 2007 Freescale Semiconductor, Inc.
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*
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* Authors: David Gibson <david@gibson.dropbear.id.au>
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* Scott Wood <scottwood@freescale.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 <stddef.h>
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#include "types.h"
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#include "string.h"
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#include "stdio.h"
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#include "ops.h"
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void dt_fixup_memory(u64 start, u64 size)
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{
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void *root, *memory;
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int naddr, nsize, i;
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u32 memreg[4];
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root = finddevice("/");
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if (getprop(root, "#address-cells", &naddr, sizeof(naddr)) < 0)
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naddr = 2;
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if (naddr < 1 || naddr > 2)
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fatal("Can't cope with #address-cells == %d in /\n\r", naddr);
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if (getprop(root, "#size-cells", &nsize, sizeof(nsize)) < 0)
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nsize = 1;
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if (nsize < 1 || nsize > 2)
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fatal("Can't cope with #size-cells == %d in /\n\r", nsize);
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i = 0;
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if (naddr == 2)
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memreg[i++] = start >> 32;
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memreg[i++] = start & 0xffffffff;
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if (nsize == 2)
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memreg[i++] = size >> 32;
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memreg[i++] = size & 0xffffffff;
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memory = finddevice("/memory");
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if (! memory) {
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memory = create_node(NULL, "memory");
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setprop_str(memory, "device_type", "memory");
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}
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printf("Memory <- <0x%x", memreg[0]);
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for (i = 1; i < (naddr + nsize); i++)
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printf(" 0x%x", memreg[i]);
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printf("> (%ldMB)\n\r", (unsigned long)(size >> 20));
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setprop(memory, "reg", memreg, (naddr + nsize)*sizeof(u32));
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}
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#define MHZ(x) ((x + 500000) / 1000000)
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void dt_fixup_cpu_clocks(u32 cpu, u32 tb, u32 bus)
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{
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void *devp = NULL;
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printf("CPU clock-frequency <- 0x%x (%dMHz)\n\r", cpu, MHZ(cpu));
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printf("CPU timebase-frequency <- 0x%x (%dMHz)\n\r", tb, MHZ(tb));
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if (bus > 0)
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printf("CPU bus-frequency <- 0x%x (%dMHz)\n\r", bus, MHZ(bus));
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while ((devp = find_node_by_devtype(devp, "cpu"))) {
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setprop_val(devp, "clock-frequency", cpu);
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setprop_val(devp, "timebase-frequency", tb);
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if (bus > 0)
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setprop_val(devp, "bus-frequency", bus);
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}
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}
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void dt_fixup_clock(const char *path, u32 freq)
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{
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void *devp = finddevice(path);
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if (devp) {
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printf("%s: clock-frequency <- %x (%dMHz)\n\r", path, freq, MHZ(freq));
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setprop_val(devp, "clock-frequency", freq);
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}
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}
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void __dt_fixup_mac_addresses(u32 startindex, ...)
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{
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va_list ap;
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u32 index = startindex;
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void *devp;
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const u8 *addr;
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va_start(ap, startindex);
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while ((addr = va_arg(ap, const u8 *))) {
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devp = find_node_by_prop_value(NULL, "linux,network-index",
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(void*)&index, sizeof(index));
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printf("ENET%d: local-mac-address <-"
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" %02x:%02x:%02x:%02x:%02x:%02x\n\r", index,
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addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
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if (devp)
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setprop(devp, "local-mac-address", addr, 6);
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index++;
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}
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va_end(ap);
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}
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#define MAX_ADDR_CELLS 4
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#define MAX_RANGES 8
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static void get_reg_format(void *node, u32 *naddr, u32 *nsize)
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{
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if (getprop(node, "#address-cells", naddr, 4) != 4)
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*naddr = 2;
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if (getprop(node, "#size-cells", nsize, 4) != 4)
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*nsize = 1;
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}
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static void copy_val(u32 *dest, u32 *src, int naddr)
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{
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memset(dest, 0, (MAX_ADDR_CELLS - naddr) * 4);
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memcpy(dest, src, naddr * 4);
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}
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static int sub_reg(u32 *reg, u32 *sub)
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{
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int i, borrow = 0;
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for (i = 0; i < MAX_ADDR_CELLS; i++) {
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int prev_borrow = borrow;
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borrow = reg[i] < sub[i] + prev_borrow;
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reg[i] -= sub[i] + prev_borrow;
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}
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return !borrow;
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}
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static int add_reg(u32 *reg, u32 *add)
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{
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int i, carry = 0;
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for (i = 0; i < MAX_ADDR_CELLS; i++) {
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u64 tmp = (u64)reg[i] + add[i] + carry;
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carry = tmp >> 32;
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reg[i] = (u32)tmp;
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}
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return !carry;
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}
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/* It is assumed that if the first byte of reg fits in a
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* range, then the whole reg block fits.
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*/
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static int compare_reg(u32 *reg, u32 *range, u32 *rangesize)
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{
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int i;
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u32 end;
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for (i = 0; i < MAX_ADDR_CELLS; i++) {
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if (reg[i] < range[i])
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return 0;
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if (reg[i] > range[i])
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break;
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}
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for (i = 0; i < MAX_ADDR_CELLS; i++) {
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end = range[i] + rangesize[i];
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if (reg[i] < end)
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break;
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if (reg[i] > end)
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return 0;
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}
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return reg[i] != end;
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}
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/* reg must be MAX_ADDR_CELLS */
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static int find_range(u32 *reg, u32 *ranges, int nregaddr,
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int naddr, int nsize, int buflen)
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{
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int nrange = nregaddr + naddr + nsize;
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int i;
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for (i = 0; i + nrange <= buflen; i += nrange) {
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u32 range_addr[MAX_ADDR_CELLS];
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u32 range_size[MAX_ADDR_CELLS];
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copy_val(range_addr, ranges + i, naddr);
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copy_val(range_size, ranges + i + nregaddr + naddr, nsize);
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if (compare_reg(reg, range_addr, range_size))
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return i;
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}
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return -1;
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}
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/* Currently only generic buses without special encodings are supported.
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* In particular, PCI is not supported. Also, only the beginning of the
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* reg block is tracked; size is ignored except in ranges.
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*/
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int dt_xlate_reg(void *node, int res, unsigned long *addr,
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unsigned long *size)
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{
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u32 last_addr[MAX_ADDR_CELLS];
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u32 this_addr[MAX_ADDR_CELLS];
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u32 buf[MAX_ADDR_CELLS * MAX_RANGES * 3];
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void *parent;
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u64 ret_addr, ret_size;
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u32 naddr, nsize, prev_naddr;
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int buflen, offset;
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parent = get_parent(node);
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if (!parent)
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return 0;
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get_reg_format(parent, &naddr, &nsize);
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if (nsize > 2)
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return 0;
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buflen = getprop(node, "reg", buf, sizeof(buf)) / 4;
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offset = (naddr + nsize) * res;
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if (buflen < offset + naddr + nsize)
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return 0;
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copy_val(last_addr, buf + offset, naddr);
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ret_size = buf[offset + naddr];
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if (nsize == 2) {
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ret_size <<= 32;
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ret_size |= buf[offset + naddr + 1];
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}
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while ((node = get_parent(node))) {
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prev_naddr = naddr;
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get_reg_format(node, &naddr, &nsize);
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buflen = getprop(node, "ranges", buf, sizeof(buf));
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if (buflen < 0)
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continue;
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if (buflen > sizeof(buf))
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return 0;
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offset = find_range(last_addr, buf, prev_naddr,
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naddr, nsize, buflen / 4);
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if (offset < 0)
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return 0;
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copy_val(this_addr, buf + offset, prev_naddr);
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if (!sub_reg(last_addr, this_addr))
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return 0;
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copy_val(this_addr, buf + offset + prev_naddr, naddr);
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if (!add_reg(last_addr, this_addr))
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return 0;
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}
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if (naddr > 2)
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return 0;
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ret_addr = last_addr[0];
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if (naddr == 2) {
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ret_addr <<= 32;
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ret_addr |= last_addr[1];
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}
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if (sizeof(void *) == 4 &&
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(ret_addr >= 0x100000000ULL || ret_size > 0x100000000ULL ||
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ret_addr + ret_size > 0x100000000ULL))
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return 0;
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*addr = ret_addr;
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if (size)
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*size = ret_size;
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return 1;
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}
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