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377 lines
8.5 KiB
377 lines
8.5 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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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 <[email protected]> |
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* Scott Wood <[email protected]> |
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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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#include "of.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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else |
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naddr = be32_to_cpu(naddr); |
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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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else |
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nsize = be32_to_cpu(nsize); |
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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++] = cpu_to_be32(start >> 32); |
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memreg[i++] = cpu_to_be32(start & 0xffffffff); |
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if (nsize == 2) |
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memreg[i++] = cpu_to_be32(size >> 32); |
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memreg[i++] = cpu_to_be32(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", be32_to_cpu(memreg[0])); |
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for (i = 1; i < (naddr + nsize); i++) |
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printf(" 0x%x", be32_to_cpu(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_to_be32(cpu)); |
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setprop_val(devp, "timebase-frequency", cpu_to_be32(tb)); |
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if (bus > 0) |
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setprop_val(devp, "bus-frequency", cpu_to_be32(bus)); |
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} |
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timebase_period_ns = 1000000000 / tb; |
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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", cpu_to_be32(freq)); |
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} |
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} |
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void dt_fixup_mac_address_by_alias(const char *alias, const u8 *addr) |
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{ |
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void *devp = find_node_by_alias(alias); |
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if (devp) { |
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printf("%s: local-mac-address <-" |
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" %02x:%02x:%02x:%02x:%02x:%02x\n\r", alias, |
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addr[0], addr[1], addr[2], |
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addr[3], addr[4], addr[5]); |
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setprop(devp, "local-mac-address", addr, 6); |
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} |
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} |
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void dt_fixup_mac_address(u32 index, const u8 *addr) |
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{ |
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void *devp = find_node_by_prop_value(NULL, "linux,network-index", |
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(void*)&index, sizeof(index)); |
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if (devp) { |
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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], |
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addr[3], addr[4], addr[5]); |
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setprop(devp, "local-mac-address", addr, 6); |
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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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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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dt_fixup_mac_address(index++, addr); |
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va_end(ap); |
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} |
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#define MAX_ADDR_CELLS 4 |
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void dt_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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else |
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*naddr = be32_to_cpu(*naddr); |
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if (getprop(node, "#size-cells", nsize, 4) != 4) |
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*nsize = 1; |
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else |
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*nsize = be32_to_cpu(*nsize); |
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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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int pad = MAX_ADDR_CELLS - naddr; |
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memset(dest, 0, pad * 4); |
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memcpy(dest + pad, 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 = MAX_ADDR_CELLS - 1; i >= 0; 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, int naddr) |
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{ |
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int i, carry = 0; |
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for (i = MAX_ADDR_CELLS - 1; i >= MAX_ADDR_CELLS - naddr; i--) { |
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u64 tmp = (u64)be32_to_cpu(reg[i]) + be32_to_cpu(add[i]) + carry; |
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carry = tmp >> 32; |
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reg[i] = cpu_to_be32((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 (be32_to_cpu(reg[i]) < be32_to_cpu(range[i])) |
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return 0; |
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if (be32_to_cpu(reg[i]) > be32_to_cpu(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 = be32_to_cpu(range[i]) + be32_to_cpu(rangesize[i]); |
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if (be32_to_cpu(reg[i]) < end) |
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break; |
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if (be32_to_cpu(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, nregaddr); |
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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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static u32 prop_buf[MAX_PROP_LEN / 4]; |
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static int dt_xlate(void *node, int res, int reglen, 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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void *parent; |
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u64 ret_addr, ret_size; |
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u32 naddr, nsize, prev_naddr, prev_nsize; |
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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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dt_get_reg_format(parent, &naddr, &nsize); |
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if (nsize > 2) |
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return 0; |
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offset = (naddr + nsize) * res; |
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if (reglen < offset + naddr + nsize || |
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MAX_PROP_LEN < (offset + naddr + nsize) * 4) |
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return 0; |
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copy_val(last_addr, prop_buf + offset, naddr); |
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ret_size = be32_to_cpu(prop_buf[offset + naddr]); |
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if (nsize == 2) { |
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ret_size <<= 32; |
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ret_size |= be32_to_cpu(prop_buf[offset + naddr + 1]); |
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} |
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for (;;) { |
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prev_naddr = naddr; |
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prev_nsize = nsize; |
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node = parent; |
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parent = get_parent(node); |
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if (!parent) |
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break; |
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dt_get_reg_format(parent, &naddr, &nsize); |
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buflen = getprop(node, "ranges", prop_buf, |
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sizeof(prop_buf)); |
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if (buflen == 0) |
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continue; |
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if (buflen < 0 || buflen > sizeof(prop_buf)) |
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return 0; |
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offset = find_range(last_addr, prop_buf, prev_naddr, |
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naddr, prev_nsize, buflen / 4); |
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if (offset < 0) |
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return 0; |
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copy_val(this_addr, prop_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, prop_buf + offset + prev_naddr, naddr); |
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if (!add_reg(last_addr, this_addr, naddr)) |
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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 = ((u64)be32_to_cpu(last_addr[2]) << 32) | be32_to_cpu(last_addr[3]); |
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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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int dt_xlate_reg(void *node, int res, unsigned long *addr, unsigned long *size) |
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{ |
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int reglen; |
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reglen = getprop(node, "reg", prop_buf, sizeof(prop_buf)) / 4; |
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return dt_xlate(node, res, reglen, addr, size); |
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} |
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int dt_xlate_addr(void *node, u32 *buf, int buflen, unsigned long *xlated_addr) |
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{ |
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if (buflen > sizeof(prop_buf)) |
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return 0; |
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memcpy(prop_buf, buf, buflen); |
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return dt_xlate(node, 0, buflen / 4, xlated_addr, NULL); |
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} |
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int dt_is_compatible(void *node, const char *compat) |
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{ |
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char *buf = (char *)prop_buf; |
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int len, pos; |
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len = getprop(node, "compatible", buf, MAX_PROP_LEN); |
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if (len < 0) |
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return 0; |
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for (pos = 0; pos < len; pos++) { |
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if (!strcmp(buf + pos, compat)) |
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return 1; |
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pos += strnlen(&buf[pos], len - pos); |
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} |
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return 0; |
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} |
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int dt_get_virtual_reg(void *node, void **addr, int nres) |
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{ |
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unsigned long xaddr; |
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int n, i; |
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n = getprop(node, "virtual-reg", addr, nres * 4); |
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if (n > 0) { |
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for (i = 0; i < n/4; i ++) |
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((u32 *)addr)[i] = be32_to_cpu(((u32 *)addr)[i]); |
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return n / 4; |
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} |
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for (n = 0; n < nres; n++) { |
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if (!dt_xlate_reg(node, n, &xaddr, NULL)) |
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break; |
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addr[n] = (void *)xaddr; |
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} |
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return n; |
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} |
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