327 lines
7.1 KiB
C
327 lines
7.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* OLPC-specific OFW device tree support code.
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*
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* Paul Mackerras August 1996.
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* Copyright (C) 1996-2005 Paul Mackerras.
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*
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* Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
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* {engebret|bergner}@us.ibm.com
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*
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* Adapted for sparc by David S. Miller davem@davemloft.net
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* Adapted for x86/OLPC by Andres Salomon <dilinger@queued.net>
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*/
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#include <linux/kernel.h>
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#include <linux/memblock.h>
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#include <linux/of.h>
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#include <linux/of_pdt.h>
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#include <asm/olpc.h>
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#include <asm/olpc_ofw.h>
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static phandle __init olpc_dt_getsibling(phandle node)
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{
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const void *args[] = { (void *)node };
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void *res[] = { &node };
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if ((s32)node == -1)
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return 0;
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if (olpc_ofw("peer", args, res) || (s32)node == -1)
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return 0;
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return node;
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}
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static phandle __init olpc_dt_getchild(phandle node)
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{
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const void *args[] = { (void *)node };
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void *res[] = { &node };
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if ((s32)node == -1)
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return 0;
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if (olpc_ofw("child", args, res) || (s32)node == -1) {
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pr_err("PROM: %s: fetching child failed!\n", __func__);
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return 0;
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}
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return node;
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}
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static int __init olpc_dt_getproplen(phandle node, const char *prop)
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{
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const void *args[] = { (void *)node, prop };
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int len;
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void *res[] = { &len };
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if ((s32)node == -1)
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return -1;
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if (olpc_ofw("getproplen", args, res)) {
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pr_err("PROM: %s: getproplen failed!\n", __func__);
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return -1;
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}
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return len;
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}
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static int __init olpc_dt_getproperty(phandle node, const char *prop,
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char *buf, int bufsize)
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{
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int plen;
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plen = olpc_dt_getproplen(node, prop);
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if (plen > bufsize || plen < 1) {
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return -1;
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} else {
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const void *args[] = { (void *)node, prop, buf, (void *)plen };
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void *res[] = { &plen };
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if (olpc_ofw("getprop", args, res)) {
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pr_err("PROM: %s: getprop failed!\n", __func__);
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return -1;
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}
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}
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return plen;
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}
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static int __init olpc_dt_nextprop(phandle node, char *prev, char *buf)
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{
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const void *args[] = { (void *)node, prev, buf };
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int success;
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void *res[] = { &success };
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buf[0] = '\0';
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if ((s32)node == -1)
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return -1;
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if (olpc_ofw("nextprop", args, res) || success != 1)
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return -1;
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return 0;
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}
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static int __init olpc_dt_pkg2path(phandle node, char *buf,
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const int buflen, int *len)
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{
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const void *args[] = { (void *)node, buf, (void *)buflen };
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void *res[] = { len };
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if ((s32)node == -1)
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return -1;
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if (olpc_ofw("package-to-path", args, res) || *len < 1)
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return -1;
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return 0;
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}
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static unsigned int prom_early_allocated __initdata;
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void * __init prom_early_alloc(unsigned long size)
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{
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static u8 *mem;
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static size_t free_mem;
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void *res;
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if (free_mem < size) {
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const size_t chunk_size = max(PAGE_SIZE, size);
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/*
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* To mimimize the number of allocations, grab at least
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* PAGE_SIZE of memory (that's an arbitrary choice that's
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* fast enough on the platforms we care about while minimizing
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* wasted bootmem) and hand off chunks of it to callers.
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*/
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res = memblock_alloc(chunk_size, SMP_CACHE_BYTES);
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if (!res)
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panic("%s: Failed to allocate %zu bytes\n", __func__,
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chunk_size);
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BUG_ON(!res);
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prom_early_allocated += chunk_size;
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memset(res, 0, chunk_size);
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free_mem = chunk_size;
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mem = res;
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}
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/* allocate from the local cache */
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free_mem -= size;
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res = mem;
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mem += size;
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return res;
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}
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static struct of_pdt_ops prom_olpc_ops __initdata = {
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.nextprop = olpc_dt_nextprop,
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.getproplen = olpc_dt_getproplen,
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.getproperty = olpc_dt_getproperty,
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.getchild = olpc_dt_getchild,
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.getsibling = olpc_dt_getsibling,
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.pkg2path = olpc_dt_pkg2path,
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};
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static phandle __init olpc_dt_finddevice(const char *path)
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{
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phandle node;
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const void *args[] = { path };
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void *res[] = { &node };
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if (olpc_ofw("finddevice", args, res)) {
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pr_err("olpc_dt: finddevice failed!\n");
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return 0;
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}
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if ((s32) node == -1)
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return 0;
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return node;
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}
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static int __init olpc_dt_interpret(const char *words)
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{
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int result;
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const void *args[] = { words };
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void *res[] = { &result };
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if (olpc_ofw("interpret", args, res)) {
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pr_err("olpc_dt: interpret failed!\n");
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return -1;
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}
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return result;
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}
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/*
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* Extract board revision directly from OFW device tree.
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* We can't use olpc_platform_info because that hasn't been set up yet.
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*/
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static u32 __init olpc_dt_get_board_revision(void)
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{
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phandle node;
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__be32 rev;
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int r;
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node = olpc_dt_finddevice("/");
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if (!node)
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return 0;
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r = olpc_dt_getproperty(node, "board-revision-int",
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(char *) &rev, sizeof(rev));
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if (r < 0)
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return 0;
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return be32_to_cpu(rev);
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}
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int olpc_dt_compatible_match(phandle node, const char *compat)
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{
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char buf[64], *p;
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int plen, len;
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plen = olpc_dt_getproperty(node, "compatible", buf, sizeof(buf));
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if (plen <= 0)
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return 0;
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len = strlen(compat);
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for (p = buf; p < buf + plen; p += strlen(p) + 1) {
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if (strcmp(p, compat) == 0)
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return 1;
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}
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return 0;
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}
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void __init olpc_dt_fixup(void)
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{
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phandle node;
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u32 board_rev;
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node = olpc_dt_finddevice("/battery@0");
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if (!node)
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return;
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board_rev = olpc_dt_get_board_revision();
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if (!board_rev)
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return;
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if (board_rev >= olpc_board_pre(0xd0)) {
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/* XO-1.5 */
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if (olpc_dt_compatible_match(node, "olpc,xo1.5-battery"))
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return;
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/* Add olpc,xo1.5-battery compatible marker to battery node */
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olpc_dt_interpret("\" /battery@0\" find-device");
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olpc_dt_interpret(" \" olpc,xo1.5-battery\" +compatible");
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olpc_dt_interpret("device-end");
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if (olpc_dt_compatible_match(node, "olpc,xo1-battery")) {
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/*
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* If we have a olpc,xo1-battery compatible, then we're
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* running a new enough firmware that already has
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* the dcon node.
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*/
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return;
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}
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/* Add dcon device */
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olpc_dt_interpret("\" /pci/display@1\" find-device");
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olpc_dt_interpret(" new-device");
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olpc_dt_interpret(" \" dcon\" device-name");
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olpc_dt_interpret(" \" olpc,xo1-dcon\" +compatible");
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olpc_dt_interpret(" finish-device");
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olpc_dt_interpret("device-end");
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} else {
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/* XO-1 */
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if (olpc_dt_compatible_match(node, "olpc,xo1-battery")) {
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/*
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* If we have a olpc,xo1-battery compatible, then we're
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* running a new enough firmware that already has
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* the dcon and RTC nodes.
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*/
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return;
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}
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/* Add dcon device, mark RTC as olpc,xo1-rtc */
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olpc_dt_interpret("\" /pci/display@1,1\" find-device");
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olpc_dt_interpret(" new-device");
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olpc_dt_interpret(" \" dcon\" device-name");
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olpc_dt_interpret(" \" olpc,xo1-dcon\" +compatible");
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olpc_dt_interpret(" finish-device");
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olpc_dt_interpret("device-end");
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olpc_dt_interpret("\" /rtc\" find-device");
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olpc_dt_interpret(" \" olpc,xo1-rtc\" +compatible");
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olpc_dt_interpret("device-end");
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}
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/* Add olpc,xo1-battery compatible marker to battery node */
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olpc_dt_interpret("\" /battery@0\" find-device");
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olpc_dt_interpret(" \" olpc,xo1-battery\" +compatible");
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olpc_dt_interpret("device-end");
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}
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void __init olpc_dt_build_devicetree(void)
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{
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phandle root;
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if (!olpc_ofw_is_installed())
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return;
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olpc_dt_fixup();
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root = olpc_dt_getsibling(0);
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if (!root) {
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pr_err("PROM: unable to get root node from OFW!\n");
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return;
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}
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of_pdt_build_devicetree(root, &prom_olpc_ops);
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pr_info("PROM DT: Built device tree with %u bytes of memory.\n",
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prom_early_allocated);
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}
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