device: include devicetree in bootblock stage

Allow bootblock to get access to the static device tree like
other early stages. device_romstage.c was renamed to
device_simple.c to better articulate the usage since it's not
just being used in romstage.

BUG=chrome-os-partner:55357

Change-Id: I3d63d2754c737cc738c09a3e3b3b468362fb78d1
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/15837
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Subrata Banik <subrata.banik@intel.com>
Tested-by: build bot (Jenkins)

src/device/device_simple.c

@@ -0,0 +1,120 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2003-2004 Linux Networx
+ * (Written by Eric Biederman <ebiederman@lnxi.com> for Linux Networx)
+ * Copyright (C) 2003 Greg Watson <jarrah@users.sourceforge.net>
+ * Copyright (C) 2004 Li-Ta Lo <ollie@lanl.gov>
+ * Copyright (C) 2005-2006 Tyan
+ * (Written by Yinghai Lu <yhlu@tyan.com> for Tyan)
+ *
+ * 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; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <device/device.h>
+#include <device/path.h>
+#include <device/pci.h>
+#include <device/resource.h>
+
+/** Linked list of ALL devices */
+ROMSTAGE_CONST struct device * ROMSTAGE_CONST all_devices = &dev_root;
+
+/**
+ * Given a PCI bus and a devfn number, find the device structure.
+ *
+ * @param bus The bus number.
+ * @param devfn A device/function number.
+ * @return Pointer to the device structure (if found), 0 otherwise.
+ */
+ROMSTAGE_CONST struct device *dev_find_slot(unsigned int bus,
+						unsigned int devfn)
+{
+	ROMSTAGE_CONST struct device *dev, *result;
+
+	result = 0;
+	for (dev = all_devices; dev; dev = dev->next) {
+		if ((dev->path.type == DEVICE_PATH_PCI) &&
+		    (dev->bus->secondary == bus) &&
+		    (dev->path.pci.devfn == devfn)) {
+			result = dev;
+			break;
+		}
+	}
+	return result;
+}
+
+/**
+ * Given a device pointer, find the next PCI device.
+ *
+ * @param previous_dev A pointer to a PCI device structure.
+ * @return Pointer to the next device structure (if found), 0 otherwise.
+ */
+ROMSTAGE_CONST struct device *dev_find_next_pci_device(
+		ROMSTAGE_CONST struct device *previous_dev)
+{
+	ROMSTAGE_CONST struct device *dev, *result;
+
+	if (previous_dev == NULL)
+		previous_dev = all_devices;
+
+	result = 0;
+	for (dev = previous_dev->next; dev; dev = dev->next) {
+		if (dev->path.type == DEVICE_PATH_PCI) {
+			result = dev;
+			break;
+		}
+	}
+	return result;
+}
+
+/**
+ * Given an SMBus bus and a device number, find the device structure.
+ *
+ * @param bus The bus number.
+ * @param addr A device number.
+ * @return Pointer to the device structure (if found), 0 otherwise.
+ */
+ROMSTAGE_CONST struct device *dev_find_slot_on_smbus(unsigned int bus,
+							unsigned int addr)
+{
+	ROMSTAGE_CONST struct device *dev, *result;
+
+	result = 0;
+	for (dev = all_devices; dev; dev = dev->next) {
+		if ((dev->path.type == DEVICE_PATH_I2C) &&
+		    (dev->bus->secondary == bus) &&
+		    (dev->path.i2c.device == addr)) {
+			result = dev;
+			break;
+		}
+	}
+	return result;
+}
+
+/**
+ * Given a PnP port and a device number, find the device structure.
+ *
+ * @param port The I/O port.
+ * @param device Logical device number.
+ * @return Pointer to the device structure (if found), 0 otherwise.
+ */
+ROMSTAGE_CONST struct device *dev_find_slot_pnp(u16 port, u16 device)
+{
+	ROMSTAGE_CONST struct device *dev;
+
+	for (dev = all_devices; dev; dev = dev->next) {
+		if ((dev->path.type == DEVICE_PATH_PNP) &&
+		    (dev->path.pnp.port == port) &&
+		    (dev->path.pnp.device == device)) {
+			return dev;
+		}
+	}
+	return 0;
+}