Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * devtree.c - convenience functions for device tree manipulation
 * Copyright 2007 David Gibson, IBM Corporation.
 * Copyright (c) 2007 Freescale Semiconductor, Inc.
 *
 * Authors: David Gibson <david@gibson.dropbear.id.au>
 *	    Scott Wood <scottwood@freescale.com>
 */
#include <stdarg.h>
#include <stddef.h>
#include "types.h"
#include "string.h"
#include "stdio.h"
#include "ops.h"
#include "of.h"
 
void dt_fixup_memory(u64 start, u64 size)
{
<------>void *root, *memory;
<------>int naddr, nsize, i;
<------>u32 memreg[4];
 
<------>root = finddevice("/");
<------>if (getprop(root, "#address-cells", &naddr, sizeof(naddr)) < 0)
<------><------>naddr = 2;
<------>else
<------><------>naddr = be32_to_cpu(naddr);
<------>if (naddr < 1 || naddr > 2)
<------><------>fatal("Can't cope with #address-cells == %d in /\n\r", naddr);
 
<------>if (getprop(root, "#size-cells", &nsize, sizeof(nsize)) < 0)
<------><------>nsize = 1;
<------>else
<------><------>nsize = be32_to_cpu(nsize);
<------>if (nsize < 1 || nsize > 2)
<------><------>fatal("Can't cope with #size-cells == %d in /\n\r", nsize);
 
<------>i = 0;
<------>if (naddr == 2)
<------><------>memreg[i++] = cpu_to_be32(start >> 32);
<------>memreg[i++] = cpu_to_be32(start & 0xffffffff);
<------>if (nsize == 2)
<------><------>memreg[i++] = cpu_to_be32(size >> 32);
<------>memreg[i++] = cpu_to_be32(size & 0xffffffff);
 
<------>memory = finddevice("/memory");
<------>if (! memory) {
<------><------>memory = create_node(NULL, "memory");
<------><------>setprop_str(memory, "device_type", "memory");
<------>}
 
<------>printf("Memory <- <0x%x", be32_to_cpu(memreg[0]));
<------>for (i = 1; i < (naddr + nsize); i++)
<------><------>printf(" 0x%x", be32_to_cpu(memreg[i]));
<------>printf("> (%ldMB)\n\r", (unsigned long)(size >> 20));
 
<------>setprop(memory, "reg", memreg, (naddr + nsize)*sizeof(u32));
}
 
#define MHZ(x)	((x + 500000) / 1000000)
 
void dt_fixup_cpu_clocks(u32 cpu, u32 tb, u32 bus)
{
<------>void *devp = NULL;
 
<------>printf("CPU clock-frequency <- 0x%x (%dMHz)\n\r", cpu, MHZ(cpu));
<------>printf("CPU timebase-frequency <- 0x%x (%dMHz)\n\r", tb, MHZ(tb));
<------>if (bus > 0)
<------><------>printf("CPU bus-frequency <- 0x%x (%dMHz)\n\r", bus, MHZ(bus));
 
<------>while ((devp = find_node_by_devtype(devp, "cpu"))) {
<------><------>setprop_val(devp, "clock-frequency", cpu_to_be32(cpu));
<------><------>setprop_val(devp, "timebase-frequency", cpu_to_be32(tb));
<------><------>if (bus > 0)
<------><------><------>setprop_val(devp, "bus-frequency", cpu_to_be32(bus));
<------>}
 
<------>timebase_period_ns = 1000000000 / tb;
}
 
void dt_fixup_clock(const char *path, u32 freq)
{
<------>void *devp = finddevice(path);
 
<------>if (devp) {
<------><------>printf("%s: clock-frequency <- %x (%dMHz)\n\r", path, freq, MHZ(freq));
<------><------>setprop_val(devp, "clock-frequency", cpu_to_be32(freq));
<------>}
}
 
void dt_fixup_mac_address_by_alias(const char *alias, const u8 *addr)
{
<------>void *devp = find_node_by_alias(alias);
 
<------>if (devp) {
<------><------>printf("%s: local-mac-address <-"
<------><------>       " %02x:%02x:%02x:%02x:%02x:%02x\n\r", alias,
<------><------>       addr[0], addr[1], addr[2],
<------><------>       addr[3], addr[4], addr[5]);
 
<------><------>setprop(devp, "local-mac-address", addr, 6);
<------>}
}
 
void dt_fixup_mac_address(u32 index, const u8 *addr)
{
<------>void *devp = find_node_by_prop_value(NULL, "linux,network-index",
<------>                                     (void*)&index, sizeof(index));
 
<------>if (devp) {
<------><------>printf("ENET%d: local-mac-address <-"
<------><------>       " %02x:%02x:%02x:%02x:%02x:%02x\n\r", index,
<------><------>       addr[0], addr[1], addr[2],
<------><------>       addr[3], addr[4], addr[5]);
 
<------><------>setprop(devp, "local-mac-address", addr, 6);
<------>}
}
 
void __dt_fixup_mac_addresses(u32 startindex, ...)
{
<------>va_list ap;
<------>u32 index = startindex;
<------>const u8 *addr;
 
<------>va_start(ap, startindex);
 
<------>while ((addr = va_arg(ap, const u8 *)))
<------><------>dt_fixup_mac_address(index++, addr);
 
<------>va_end(ap);
}
 
#define MAX_ADDR_CELLS 4
 
void dt_get_reg_format(void *node, u32 *naddr, u32 *nsize)
{
<------>if (getprop(node, "#address-cells", naddr, 4) != 4)
<------><------>*naddr = 2;
<------>else
<------><------>*naddr = be32_to_cpu(*naddr);
<------>if (getprop(node, "#size-cells", nsize, 4) != 4)
<------><------>*nsize = 1;
<------>else
<------><------>*nsize = be32_to_cpu(*nsize);
}
 
static void copy_val(u32 *dest, u32 *src, int naddr)
{
<------>int pad = MAX_ADDR_CELLS - naddr;
 
<------>memset(dest, 0, pad * 4);
<------>memcpy(dest + pad, src, naddr * 4);
}
 
static int sub_reg(u32 *reg, u32 *sub)
{
<------>int i, borrow = 0;
 
<------>for (i = MAX_ADDR_CELLS - 1; i >= 0; i--) {
<------><------>int prev_borrow = borrow;
<------><------>borrow = reg[i] < sub[i] + prev_borrow;
<------><------>reg[i] -= sub[i] + prev_borrow;
<------>}
 
<------>return !borrow;
}
 
static int add_reg(u32 *reg, u32 *add, int naddr)
{
<------>int i, carry = 0;
 
<------>for (i = MAX_ADDR_CELLS - 1; i >= MAX_ADDR_CELLS - naddr; i--) {
<------><------>u64 tmp = (u64)be32_to_cpu(reg[i]) + be32_to_cpu(add[i]) + carry;
<------><------>carry = tmp >> 32;
<------><------>reg[i] = cpu_to_be32((u32)tmp);
<------>}
 
<------>return !carry;
}
 
/* It is assumed that if the first byte of reg fits in a
 * range, then the whole reg block fits.
 */
static int compare_reg(u32 *reg, u32 *range, u32 *rangesize)
{
<------>int i;
<------>u32 end;
 
<------>for (i = 0; i < MAX_ADDR_CELLS; i++) {
<------><------>if (be32_to_cpu(reg[i]) < be32_to_cpu(range[i]))
<------><------><------>return 0;
<------><------>if (be32_to_cpu(reg[i]) > be32_to_cpu(range[i]))
<------><------><------>break;
<------>}
 
<------>for (i = 0; i < MAX_ADDR_CELLS; i++) {
<------><------>end = be32_to_cpu(range[i]) + be32_to_cpu(rangesize[i]);
 
<------><------>if (be32_to_cpu(reg[i]) < end)
<------><------><------>break;
<------><------>if (be32_to_cpu(reg[i]) > end)
<------><------><------>return 0;
<------>}
 
<------>return reg[i] != end;
}
 
/* reg must be MAX_ADDR_CELLS */
static int find_range(u32 *reg, u32 *ranges, int nregaddr,
                      int naddr, int nsize, int buflen)
{
<------>int nrange = nregaddr + naddr + nsize;
<------>int i;
 
<------>for (i = 0; i + nrange <= buflen; i += nrange) {
<------><------>u32 range_addr[MAX_ADDR_CELLS];
<------><------>u32 range_size[MAX_ADDR_CELLS];
 
<------><------>copy_val(range_addr, ranges + i, nregaddr);
<------><------>copy_val(range_size, ranges + i + nregaddr + naddr, nsize);
 
<------><------>if (compare_reg(reg, range_addr, range_size))
<------><------><------>return i;
<------>}
 
<------>return -1;
}
 
/* Currently only generic buses without special encodings are supported.
 * In particular, PCI is not supported.  Also, only the beginning of the
 * reg block is tracked; size is ignored except in ranges.
 */
static u32 prop_buf[MAX_PROP_LEN / 4];
 
static int dt_xlate(void *node, int res, int reglen, unsigned long *addr,
<------><------>unsigned long *size)
{
<------>u32 last_addr[MAX_ADDR_CELLS];
<------>u32 this_addr[MAX_ADDR_CELLS];
<------>void *parent;
<------>u64 ret_addr, ret_size;
<------>u32 naddr, nsize, prev_naddr, prev_nsize;
<------>int buflen, offset;
 
<------>parent = get_parent(node);
<------>if (!parent)
<------><------>return 0;
 
<------>dt_get_reg_format(parent, &naddr, &nsize);
<------>if (nsize > 2)
<------><------>return 0;
 
<------>offset = (naddr + nsize) * res;
 
<------>if (reglen < offset + naddr + nsize ||
<------>    MAX_PROP_LEN < (offset + naddr + nsize) * 4)
<------><------>return 0;
 
<------>copy_val(last_addr, prop_buf + offset, naddr);
 
<------>ret_size = be32_to_cpu(prop_buf[offset + naddr]);
<------>if (nsize == 2) {
<------><------>ret_size <<= 32;
<------><------>ret_size |= be32_to_cpu(prop_buf[offset + naddr + 1]);
<------>}
 
<------>for (;;) {
<------><------>prev_naddr = naddr;
<------><------>prev_nsize = nsize;
<------><------>node = parent;
 
<------><------>parent = get_parent(node);
<------><------>if (!parent)
<------><------><------>break;
 
<------><------>dt_get_reg_format(parent, &naddr, &nsize);
 
<------><------>buflen = getprop(node, "ranges", prop_buf,
<------><------><------><------>sizeof(prop_buf));
<------><------>if (buflen == 0)
<------><------><------>continue;
<------><------>if (buflen < 0 || buflen > sizeof(prop_buf))
<------><------><------>return 0;
 
<------><------>offset = find_range(last_addr, prop_buf, prev_naddr,
<------><------>                    naddr, prev_nsize, buflen / 4);
<------><------>if (offset < 0)
<------><------><------>return 0;
 
<------><------>copy_val(this_addr, prop_buf + offset, prev_naddr);
 
<------><------>if (!sub_reg(last_addr, this_addr))
<------><------><------>return 0;
 
<------><------>copy_val(this_addr, prop_buf + offset + prev_naddr, naddr);
 
<------><------>if (!add_reg(last_addr, this_addr, naddr))
<------><------><------>return 0;
<------>}
 
<------>if (naddr > 2)
<------><------>return 0;
 
<------>ret_addr = ((u64)be32_to_cpu(last_addr[2]) << 32) | be32_to_cpu(last_addr[3]);
<------>if (sizeof(void *) == 4 &&
<------>    (ret_addr >= 0x100000000ULL || ret_size > 0x100000000ULL ||
<------>     ret_addr + ret_size > 0x100000000ULL))
<------><------>return 0;
 
<------>*addr = ret_addr;
<------>if (size)
<------><------>*size = ret_size;
 
<------>return 1;
}
 
int dt_xlate_reg(void *node, int res, unsigned long *addr, unsigned long *size)
{
<------>int reglen;
 
<------>reglen = getprop(node, "reg", prop_buf, sizeof(prop_buf)) / 4;
<------>return dt_xlate(node, res, reglen, addr, size);
}
 
int dt_xlate_addr(void *node, u32 *buf, int buflen, unsigned long *xlated_addr)
{
 
<------>if (buflen > sizeof(prop_buf))
<------><------>return 0;
 
<------>memcpy(prop_buf, buf, buflen);
<------>return dt_xlate(node, 0, buflen / 4, xlated_addr, NULL);
}
 
int dt_is_compatible(void *node, const char *compat)
{
<------>char *buf = (char *)prop_buf;
<------>int len, pos;
 
<------>len = getprop(node, "compatible", buf, MAX_PROP_LEN);
<------>if (len < 0)
<------><------>return 0;
 
<------>for (pos = 0; pos < len; pos++) {
<------><------>if (!strcmp(buf + pos, compat))
<------><------><------>return 1;
 
<------><------>pos += strnlen(&buf[pos], len - pos);
<------>}
 
<------>return 0;
}
 
int dt_get_virtual_reg(void *node, void **addr, int nres)
{
<------>unsigned long xaddr;
<------>int n, i;
 
<------>n = getprop(node, "virtual-reg", addr, nres * 4);
<------>if (n > 0) {
<------><------>for (i = 0; i < n/4; i ++)
<------><------><------>((u32 *)addr)[i] = be32_to_cpu(((u32 *)addr)[i]);
<------><------>return n / 4;
<------>}
 
<------>for (n = 0; n < nres; n++) {
<------><------>if (!dt_xlate_reg(node, n, &xaddr, NULL))
<------><------><------>break;
 
<------><------>addr[n] = (void *)xaddr;
<------>}
 
<------>return n;
}