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27fbaa9702
This patch adds a library of useful device tree manipulation functions to the zImage library, for use by platform code. These functions are based on the hooks already in dt_ops, so they're not dependent on a particular device tree implementation. This patch also slightly streamlines the code in main.c using these new functions. This is a consolidation of my work in this area with Scott Wood's patches to a very similar end. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
112 lines
2.9 KiB
C
112 lines
2.9 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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