u-boot/net/eth-uclass.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2001-2015
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
* Joe Hershberger, National Instruments
*/
#include <common.h>
#include <bootstage.h>
#include <dm.h>
#include <env.h>
#include <log.h>
#include <net.h>
#include <dm/device-internal.h>
#include <dm/uclass-internal.h>
#include <net/pcap.h>
#include "eth_internal.h"
#include <eth_phy.h>
DECLARE_GLOBAL_DATA_PTR;
/**
* struct eth_device_priv - private structure for each Ethernet device
*
* @state: The state of the Ethernet MAC driver (defined by enum eth_state_t)
*/
struct eth_device_priv {
enum eth_state_t state;
};
/**
* struct eth_uclass_priv - The structure attached to the uclass itself
*
* @current: The Ethernet device that the network functions are using
*/
struct eth_uclass_priv {
struct udevice *current;
};
/* eth_errno - This stores the most recent failure code from DM functions */
static int eth_errno;
static struct eth_uclass_priv *eth_get_uclass_priv(void)
{
struct uclass *uc;
int ret;
ret = uclass_get(UCLASS_ETH, &uc);
if (ret)
return NULL;
assert(uc);
return uc->priv;
}
void eth_set_current_to_next(void)
{
struct eth_uclass_priv *uc_priv;
uc_priv = eth_get_uclass_priv();
if (uc_priv->current)
uclass_next_device(&uc_priv->current);
if (!uc_priv->current)
uclass_first_device(UCLASS_ETH, &uc_priv->current);
}
/*
* Typically this will simply return the active device.
* In the case where the most recent active device was unset, this will attempt
* to return the first device. If that device doesn't exist or fails to probe,
* this function will return NULL.
*/
struct udevice *eth_get_dev(void)
{
struct eth_uclass_priv *uc_priv;
uc_priv = eth_get_uclass_priv();
if (!uc_priv->current)
eth_errno = uclass_first_device(UCLASS_ETH,
&uc_priv->current);
return uc_priv->current;
}
/*
* Typically this will just store a device pointer.
* In case it was not probed, we will attempt to do so.
* dev may be NULL to unset the active device.
*/
void eth_set_dev(struct udevice *dev)
{
if (dev && !device_active(dev)) {
eth_errno = device_probe(dev);
if (eth_errno)
dev = NULL;
}
eth_get_uclass_priv()->current = dev;
}
/*
* Find the udevice that either has the name passed in as devname or has an
* alias named devname.
*/
struct udevice *eth_get_dev_by_name(const char *devname)
{
int seq = -1;
char *endp = NULL;
const char *startp = NULL;
struct udevice *it;
struct uclass *uc;
int len = strlen("eth");
int ret;
/* Must be longer than 3 to be an alias */
if (!strncmp(devname, "eth", len) && strlen(devname) > len) {
startp = devname + len;
seq = simple_strtoul(startp, &endp, 10);
}
ret = uclass_get(UCLASS_ETH, &uc);
if (ret)
return NULL;
uclass_foreach_dev(it, uc) {
/*
* We need the seq to be valid, so try to probe it.
* If the probe fails, the seq will not match since it will be
* -1 instead of what we are looking for.
* We don't care about errors from probe here. Either they won't
* match an alias or it will match a literal name and we'll pick
* up the error when we try to probe again in eth_set_dev().
*/
if (device_probe(it))
continue;
/* Check for the name or the sequence number to match */
if (strcmp(it->name, devname) == 0 ||
(endp > startp && it->seq == seq))
return it;
}
return NULL;
}
unsigned char *eth_get_ethaddr(void)
{
struct eth_pdata *pdata;
if (eth_get_dev()) {
pdata = eth_get_dev()->platdata;
return pdata->enetaddr;
}
return NULL;
}
/* Set active state without calling start on the driver */
int eth_init_state_only(void)
{
struct udevice *current;
struct eth_device_priv *priv;
current = eth_get_dev();
if (!current || !device_active(current))
return -EINVAL;
priv = current->uclass_priv;
priv->state = ETH_STATE_ACTIVE;
return 0;
}
/* Set passive state without calling stop on the driver */
void eth_halt_state_only(void)
{
struct udevice *current;
struct eth_device_priv *priv;
current = eth_get_dev();
if (!current || !device_active(current))
return;
priv = current->uclass_priv;
priv->state = ETH_STATE_PASSIVE;
}
int eth_get_dev_index(void)
{
if (eth_get_dev())
return eth_get_dev()->seq;
return -1;
}
static int eth_write_hwaddr(struct udevice *dev)
{
struct eth_pdata *pdata;
int ret = 0;
if (!dev || !device_active(dev))
return -EINVAL;
/* seq is valid since the device is active */
if (eth_get_ops(dev)->write_hwaddr && !eth_mac_skip(dev->seq)) {
pdata = dev->platdata;
if (!is_valid_ethaddr(pdata->enetaddr)) {
printf("\nError: %s address %pM illegal value\n",
dev->name, pdata->enetaddr);
return -EINVAL;
}
/*
* Drivers are allowed to decide not to implement this at
* run-time. E.g. Some devices may use it and some may not.
*/
ret = eth_get_ops(dev)->write_hwaddr(dev);
if (ret == -ENOSYS)
ret = 0;
if (ret)
printf("\nWarning: %s failed to set MAC address\n",
dev->name);
}
return ret;
}
static int on_ethaddr(const char *name, const char *value, enum env_op op,
int flags)
{
int index;
int retval;
struct udevice *dev;
/* look for an index after "eth" */
index = simple_strtoul(name + 3, NULL, 10);
retval = uclass_find_device_by_seq(UCLASS_ETH, index, false, &dev);
if (!retval) {
struct eth_pdata *pdata = dev->platdata;
switch (op) {
case env_op_create:
case env_op_overwrite:
string_to_enetaddr(value, pdata->enetaddr);
eth_write_hwaddr(dev);
break;
case env_op_delete:
memset(pdata->enetaddr, 0, ARP_HLEN);
}
}
return 0;
}
U_BOOT_ENV_CALLBACK(ethaddr, on_ethaddr);
int eth_init(void)
{
char *ethact = env_get("ethact");
char *ethrotate = env_get("ethrotate");
struct udevice *current = NULL;
struct udevice *old_current;
int ret = -ENODEV;
/*
* When 'ethrotate' variable is set to 'no' and 'ethact' variable
* is already set to an ethernet device, we should stick to 'ethact'.
*/
if ((ethrotate != NULL) && (strcmp(ethrotate, "no") == 0)) {
if (ethact) {
current = eth_get_dev_by_name(ethact);
if (!current)
return -EINVAL;
}
}
if (!current) {
current = eth_get_dev();
if (!current) {
printf("No ethernet found.\n");
return -ENODEV;
}
}
old_current = current;
do {
if (current) {
debug("Trying %s\n", current->name);
if (device_active(current)) {
ret = eth_get_ops(current)->start(current);
if (ret >= 0) {
struct eth_device_priv *priv =
current->uclass_priv;
priv->state = ETH_STATE_ACTIVE;
return 0;
}
} else {
ret = eth_errno;
}
debug("FAIL\n");
} else {
debug("PROBE FAIL\n");
}
/*
* If ethrotate is enabled, this will change "current",
* otherwise we will drop out of this while loop immediately
*/
eth_try_another(0);
/* This will ensure the new "current" attempted to probe */
current = eth_get_dev();
} while (old_current != current);
return ret;
}
void eth_halt(void)
{
struct udevice *current;
struct eth_device_priv *priv;
current = eth_get_dev();
if (!current || !eth_is_active(current))
return;
eth_get_ops(current)->stop(current);
priv = current->uclass_priv;
if (priv)
priv->state = ETH_STATE_PASSIVE;
}
int eth_is_active(struct udevice *dev)
{
struct eth_device_priv *priv;
if (!dev || !device_active(dev))
return 0;
priv = dev_get_uclass_priv(dev);
return priv->state == ETH_STATE_ACTIVE;
}
int eth_send(void *packet, int length)
{
struct udevice *current;
int ret;
current = eth_get_dev();
if (!current)
return -ENODEV;
if (!eth_is_active(current))
return -EINVAL;
ret = eth_get_ops(current)->send(current, packet, length);
if (ret < 0) {
/* We cannot completely return the error at present */
debug("%s: send() returned error %d\n", __func__, ret);
}
#if defined(CONFIG_CMD_PCAP)
if (ret >= 0)
pcap_post(packet, length, true);
#endif
return ret;
}
int eth_rx(void)
{
struct udevice *current;
uchar *packet;
int flags;
int ret;
int i;
current = eth_get_dev();
if (!current)
return -ENODEV;
if (!eth_is_active(current))
return -EINVAL;
/* Process up to 32 packets at one time */
flags = ETH_RECV_CHECK_DEVICE;
for (i = 0; i < 32; i++) {
ret = eth_get_ops(current)->recv(current, flags, &packet);
flags = 0;
if (ret > 0)
net_process_received_packet(packet, ret);
if (ret >= 0 && eth_get_ops(current)->free_pkt)
eth_get_ops(current)->free_pkt(current, packet, ret);
if (ret <= 0)
break;
}
if (ret == -EAGAIN)
ret = 0;
if (ret < 0) {
/* We cannot completely return the error at present */
debug("%s: recv() returned error %d\n", __func__, ret);
}
return ret;
}
int eth_initialize(void)
{
int num_devices = 0;
struct udevice *dev;
eth_common_init();
/*
* Devices need to write the hwaddr even if not started so that Linux
* will have access to the hwaddr that u-boot stored for the device.
* This is accomplished by attempting to probe each device and calling
* their write_hwaddr() operation.
*/
uclass_first_device_check(UCLASS_ETH, &dev);
if (!dev) {
printf("No ethernet found.\n");
bootstage_error(BOOTSTAGE_ID_NET_ETH_START);
} else {
char *ethprime = env_get("ethprime");
struct udevice *prime_dev = NULL;
if (ethprime)
prime_dev = eth_get_dev_by_name(ethprime);
if (prime_dev) {
eth_set_dev(prime_dev);
eth_current_changed();
} else {
eth_set_dev(NULL);
}
bootstage_mark(BOOTSTAGE_ID_NET_ETH_INIT);
do {
if (dev->seq != -1) {
if (num_devices)
printf(", ");
printf("eth%d: %s", dev->seq, dev->name);
if (ethprime && dev == prime_dev)
printf(" [PRIME]");
}
eth_write_hwaddr(dev);
if (dev->seq != -1)
num_devices++;
uclass_next_device_check(&dev);
} while (dev);
if (!num_devices)
printf("No ethernet found.\n");
putc('\n');
}
return num_devices;
}
static int eth_post_bind(struct udevice *dev)
{
if (strchr(dev->name, ' ')) {
printf("\nError: eth device name \"%s\" has a space!\n",
dev->name);
return -EINVAL;
}
#ifdef CONFIG_DM_ETH_PHY
eth_phy_binds_nodes(dev);
#endif
return 0;
}
static int eth_pre_unbind(struct udevice *dev)
{
/* Don't hang onto a pointer that is going away */
if (dev == eth_get_uclass_priv()->current)
eth_set_dev(NULL);
return 0;
}
static bool eth_dev_get_mac_address(struct udevice *dev, u8 mac[ARP_HLEN])
{
#if IS_ENABLED(CONFIG_OF_CONTROL)
const uint8_t *p;
p = dev_read_u8_array_ptr(dev, "mac-address", ARP_HLEN);
if (!p)
p = dev_read_u8_array_ptr(dev, "local-mac-address", ARP_HLEN);
if (!p)
return false;
memcpy(mac, p, ARP_HLEN);
return true;
#else
return false;
#endif
}
static int eth_post_probe(struct udevice *dev)
{
struct eth_device_priv *priv = dev->uclass_priv;
struct eth_pdata *pdata = dev->platdata;
unsigned char env_enetaddr[ARP_HLEN];
char *source = "DT";
#if defined(CONFIG_NEEDS_MANUAL_RELOC)
struct eth_ops *ops = eth_get_ops(dev);
static int reloc_done;
if (!reloc_done) {
if (ops->start)
ops->start += gd->reloc_off;
if (ops->send)
ops->send += gd->reloc_off;
if (ops->recv)
ops->recv += gd->reloc_off;
if (ops->free_pkt)
ops->free_pkt += gd->reloc_off;
if (ops->stop)
ops->stop += gd->reloc_off;
if (ops->mcast)
ops->mcast += gd->reloc_off;
if (ops->write_hwaddr)
ops->write_hwaddr += gd->reloc_off;
if (ops->read_rom_hwaddr)
ops->read_rom_hwaddr += gd->reloc_off;
reloc_done++;
}
#endif
priv->state = ETH_STATE_INIT;
/* Check if the device has a valid MAC address in device tree */
if (!eth_dev_get_mac_address(dev, pdata->enetaddr) ||
!is_valid_ethaddr(pdata->enetaddr)) {
source = "ROM";
/* Check if the device has a MAC address in ROM */
if (eth_get_ops(dev)->read_rom_hwaddr)
eth_get_ops(dev)->read_rom_hwaddr(dev);
}
eth_env_get_enetaddr_by_index("eth", dev->seq, env_enetaddr);
if (!is_zero_ethaddr(env_enetaddr)) {
if (!is_zero_ethaddr(pdata->enetaddr) &&
memcmp(pdata->enetaddr, env_enetaddr, ARP_HLEN)) {
printf("\nWarning: %s MAC addresses don't match:\n",
dev->name);
printf("Address in %s is\t\t%pM\n",
source, pdata->enetaddr);
printf("Address in environment is\t%pM\n",
env_enetaddr);
}
/* Override the ROM MAC address */
memcpy(pdata->enetaddr, env_enetaddr, ARP_HLEN);
} else if (is_valid_ethaddr(pdata->enetaddr)) {
eth_env_set_enetaddr_by_index("eth", dev->seq, pdata->enetaddr);
} else if (is_zero_ethaddr(pdata->enetaddr) ||
!is_valid_ethaddr(pdata->enetaddr)) {
#ifdef CONFIG_NET_RANDOM_ETHADDR
net_random_ethaddr(pdata->enetaddr);
printf("\nWarning: %s (eth%d) using random MAC address - %pM\n",
dev->name, dev->seq, pdata->enetaddr);
#else
printf("\nError: %s address not set.\n",
dev->name);
return -EINVAL;
#endif
}
eth_write_hwaddr(dev);
return 0;
}
static int eth_pre_remove(struct udevice *dev)
{
struct eth_pdata *pdata = dev->platdata;
eth_get_ops(dev)->stop(dev);
/* clear the MAC address */
memset(pdata->enetaddr, 0, ARP_HLEN);
return 0;
}
UCLASS_DRIVER(eth) = {
.name = "eth",
.id = UCLASS_ETH,
.post_bind = eth_post_bind,
.pre_unbind = eth_pre_unbind,
.post_probe = eth_post_probe,
.pre_remove = eth_pre_remove,
.priv_auto_alloc_size = sizeof(struct eth_uclass_priv),
.per_device_auto_alloc_size = sizeof(struct eth_device_priv),
.flags = DM_UC_FLAG_SEQ_ALIAS,
};