Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * 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>

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version

 * 2 of the License, or (at your option) any later version.

 */

#include <stdarg.h>

#include <stddef.h>

#include "types.h"

#include "string.h"

#include "stdio.h"

#include "ops.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;

        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;

        if (nsize < 1 || nsize > 2)

                fatal("Can't cope with #size-cells == %d in /\n\r", nsize);

        i = 0;

        if (naddr == 2)

                memreg[i++] = start >> 32;

        memreg[i++] = start & 0xffffffff;

        if (nsize == 2)

                memreg[i++] = size >> 32;

        memreg[i++] = size & 0xffffffff;

        memory = finddevice("/memory");

        if (! memory) {

                memory = create_node(NULL, "memory");

                setprop_str(memory, "device_type", "memory");

        }

        printf("Memory <- <0x%x", memreg[0]);

        for (i = 1; i < (naddr + nsize); i++)

                printf(" 0x%x", 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);

                setprop_val(devp, "timebase-frequency", tb);

                if (bus > 0)

                        setprop_val(devp, "bus-frequency", 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", freq);

        }

}

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;

        if (getprop(node, "#size-cells", nsize, 4) != 4)

                *nsize = 1;

}

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)reg[i] + add[i] + carry;

                carry = tmp >> 32;

                reg[i] = (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 (reg[i] < range[i])

                        return 0;

                if (reg[i] > range[i])

                        break;

        }

        for (i = 0; i < MAX_ADDR_CELLS; i++) {

                end = range[i] + rangesize[i];

                if (reg[i] < end)

                        break;

                if (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, naddr);

                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 = prop_buf[offset + naddr];

        if (nsize == 2) {

                ret_size <<= 32;

                ret_size |= 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)last_addr[2] << 32) | 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;

}