[POWERPC] bootwrapper: Add PlanetCore firmware support

This is a library that board code can use to extract information from the
PlanetCore configuration keys.  PlanetCore is used on various boards from
Embedded Planet.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/boot/planetcore.c

@@ -0,0 +1,166 @@
+/*
+ * PlanetCore configuration data support functions
+ *
+ * Author: Scott Wood <scottwood@freescale.com>
+ *
+ * Copyright (c) 2007 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#include "stdio.h"
+#include "stdlib.h"
+#include "ops.h"
+#include "planetcore.h"
+#include "io.h"
+
+/* PlanetCore passes information to the OS in the form of
+ * a table of key=value strings, separated by newlines.
+ *
+ * The list is terminated by an empty string (i.e. two
+ * consecutive newlines).
+ *
+ * To make it easier to parse, we first convert all the
+ * newlines into null bytes.
+ */
+
+void planetcore_prepare_table(char *table)
+{
+	do {
+		if (*table == '\n')
+			*table = 0;
+
+		table++;
+	} while (*(table - 1) || *table != '\n');
+
+	*table = 0;
+}
+
+const char *planetcore_get_key(const char *table, const char *key)
+{
+	int keylen = strlen(key);
+
+	do {
+		if (!strncmp(table, key, keylen) && table[keylen] == '=')
+			return table + keylen + 1;
+
+		table += strlen(table) + 1;
+	} while (strlen(table) != 0);
+
+	return NULL;
+}
+
+int planetcore_get_decimal(const char *table, const char *key, u64 *val)
+{
+	const char *str = planetcore_get_key(table, key);
+	if (!str)
+		return 0;
+
+	*val = strtoull(str, NULL, 10);
+	return 1;
+}
+
+int planetcore_get_hex(const char *table, const char *key, u64 *val)
+{
+	const char *str = planetcore_get_key(table, key);
+	if (!str)
+		return 0;
+
+	*val = strtoull(str, NULL, 16);
+	return 1;
+}
+
+static u64 mac_table[4] = {
+	0x000000000000,
+	0x000000800000,
+	0x000000400000,
+	0x000000c00000,
+};
+
+void planetcore_set_mac_addrs(const char *table)
+{
+	u8 addr[4][6];
+	u64 int_addr;
+	u32 i;
+	int j;
+
+	if (!planetcore_get_hex(table, PLANETCORE_KEY_MAC_ADDR, &int_addr))
+		return;
+
+	for (i = 0; i < 4; i++) {
+		u64 this_dev_addr = (int_addr & ~0x000000c00000) |
+		                    mac_table[i];
+
+		for (j = 5; j >= 0; j--) {
+			addr[i][j] = this_dev_addr & 0xff;
+			this_dev_addr >>= 8;
+		}
+
+		dt_fixup_mac_address(i, addr[i]);
+	}
+}
+
+static char prop_buf[MAX_PROP_LEN];
+
+void planetcore_set_stdout_path(const char *table)
+{
+	char *path;
+	const char *label;
+	void *node, *chosen;
+
+	label = planetcore_get_key(table, PLANETCORE_KEY_SERIAL_PORT);
+	if (!label)
+		return;
+
+	node = find_node_by_prop_value_str(NULL, "linux,planetcore-label",
+	                                   label);
+	if (!node)
+		return;
+
+	path = get_path(node, prop_buf, MAX_PROP_LEN);
+	if (!path)
+		return;
+
+	chosen = finddevice("/chosen");
+	if (!chosen)
+		chosen = create_node(NULL, "chosen");
+	if (!chosen)
+		return;
+
+	setprop_str(chosen, "linux,stdout-path", path);
+}
+
+void planetcore_set_serial_speed(const char *table)
+{
+	void *chosen, *stdout;
+	u64 baud;
+	u32 baud32;
+	int len;
+
+	chosen = finddevice("/chosen");
+	if (!chosen)
+		return;
+
+	len = getprop(chosen, "linux,stdout-path", prop_buf, MAX_PROP_LEN);
+	if (len <= 0)
+		return;
+
+	stdout = finddevice(prop_buf);
+	if (!stdout) {
+		printf("planetcore_set_serial_speed: "
+		       "Bad /chosen/linux,stdout-path.\r\n");
+
+		return;
+	}
+
+	if (!planetcore_get_decimal(table, PLANETCORE_KEY_SERIAL_BAUD,
+	                            &baud)) {
+		printf("planetcore_set_serial_speed: No SB tag.\r\n");
+		return;
+	}
+
+	baud32 = baud;
+	setprop(stdout, "current-speed", &baud32, 4);
+}