1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Bootdev for ethernet (uses PXE)
4 *
5 * Copyright 2021 Google LLC
6 * Written by Simon Glass <sjg@chromium.org>
7 */
8
9#define LOG_CATEGORY UCLASS_BOOTSTD
10
11#include <common.h>
12#include <bootdev.h>
13#include <bootflow.h>
14#include <command.h>
15#include <bootmeth.h>
16#include <dm.h>
17#include <extlinux.h>
18#include <init.h>
19#include <log.h>
20#include <net.h>
21#include <test/test.h>
22
23static int eth_get_bootflow(struct udevice *dev, struct bootflow_iter *iter,
24			    struct bootflow *bflow)
25{
26	char name[60];
27	int ret;
28
29	/* Must be an Ethernet device */
30	ret = bootflow_iter_check_net(iter);
31	if (ret)
32		return log_msg_ret("net", ret);
33
34	ret = bootmeth_check(bflow->method, iter);
35	if (ret)
36		return log_msg_ret("check", ret);
37
38	/*
39	 * Like extlinux boot, this assumes there is only one Ethernet device.
40	 * In this case, that means that @eth is ignored
41	 */
42
43	snprintf(name, sizeof(name), "%s.%d", dev->name, iter->part);
44	bflow->name = strdup(name);
45	if (!bflow->name)
46		return log_msg_ret("name", -ENOMEM);
47
48	/* See distro_pxe_read_bootflow() for the standard impl of this */
49	log_debug("dhcp complete - reading bootflow with method '%s'\n",
50		  bflow->method->name);
51	ret = bootmeth_read_bootflow(bflow->method, bflow);
52	log_debug("reading bootflow returned %d\n", ret);
53	if (ret)
54		return log_msg_ret("method", ret);
55
56	return 0;
57}
58
59static int eth_bootdev_bind(struct udevice *dev)
60{
61	struct bootdev_uc_plat *ucp = dev_get_uclass_plat(dev);
62
63	ucp->prio = BOOTDEVP_6_NET_BASE;
64
65	return 0;
66}
67
68static int eth_bootdev_hunt(struct bootdev_hunter *info, bool show)
69{
70	int ret;
71
72	if (!test_eth_enabled())
73		return 0;
74
75	/* init PCI first since this is often used to provide Ehternet */
76	if (IS_ENABLED(CONFIG_PCI)) {
77		ret = pci_init();
78		if (ret)
79			log_warning("Failed to init PCI (%dE)\n", ret);
80	}
81
82	/*
83	 * Ethernet devices can also come from USB, but that is a higher
84	 * priority (BOOTDEVP_5_SCAN_SLOW) than ethernet, so it should have been
85	 * enumerated already. If something like 'bootflow scan dhcp' is used
86	 * then the user will need to run 'usb start' first.
87	 */
88	if (IS_ENABLED(CONFIG_CMD_DHCP)) {
89		ret = dhcp_run(0, NULL, false);
90		if (ret)
91			return -EINVAL;
92	}
93
94	return 0;
95}
96
97struct bootdev_ops eth_bootdev_ops = {
98	.get_bootflow	= eth_get_bootflow,
99};
100
101static const struct udevice_id eth_bootdev_ids[] = {
102	{ .compatible = "u-boot,bootdev-eth" },
103	{ }
104};
105
106U_BOOT_DRIVER(eth_bootdev) = {
107	.name		= "eth_bootdev",
108	.id		= UCLASS_BOOTDEV,
109	.ops		= &eth_bootdev_ops,
110	.bind		= eth_bootdev_bind,
111	.of_match	= eth_bootdev_ids,
112};
113
114BOOTDEV_HUNTER(eth_bootdev_hunt) = {
115	.prio		= BOOTDEVP_6_NET_BASE,
116	.uclass		= UCLASS_ETH,
117	.hunt		= eth_bootdev_hunt,
118	.drv		= DM_DRIVER_REF(eth_bootdev),
119};
120