1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright 2019-2021 NXP
8 #include <dm/device_compat.h>
9 #include <dm/device-internal.h>
10 #include <dm/uclass-internal.h>
11 #include <linux/bitmap.h>
14 #define DSA_PORT_CHILD_DRV_NAME "dsa-port"
16 /* per-device internal state structure */
18 struct phy_device *cpu_port_fixed_phy;
19 struct udevice *master_dev;
27 int dsa_set_tagging(struct udevice *dev, ushort headroom, ushort tailroom)
29 struct dsa_priv *priv;
34 if (headroom + tailroom > DSA_MAX_OVR)
37 priv = dev_get_uclass_priv(dev);
40 priv->headroom = headroom;
42 priv->tailroom = tailroom;
47 ofnode dsa_port_get_ofnode(struct udevice *dev, int port)
49 struct dsa_pdata *pdata = dev_get_uclass_plat(dev);
50 struct dsa_port_pdata *port_pdata;
53 if (port == pdata->cpu_port)
54 return pdata->cpu_port_node;
56 for (device_find_first_child(dev, &pdev);
58 device_find_next_child(&pdev)) {
59 port_pdata = dev_get_parent_plat(pdev);
60 if (port_pdata->index == port)
61 return dev_ofnode(pdev);
67 /* returns the DSA master Ethernet device */
68 struct udevice *dsa_get_master(struct udevice *dev)
70 struct dsa_priv *priv;
75 priv = dev_get_uclass_priv(dev);
77 return priv->master_dev;
81 * Start the desired port, the CPU port and the master Eth interface.
82 * TODO: if cascaded we may need to _start ports in other switches too
84 static int dsa_port_start(struct udevice *pdev)
86 struct udevice *dev = dev_get_parent(pdev);
87 struct dsa_priv *priv = dev_get_uclass_priv(dev);
88 struct udevice *master = dsa_get_master(dev);
89 struct dsa_ops *ops = dsa_get_ops(dev);
92 if (ops->port_enable) {
93 struct dsa_port_pdata *port_pdata;
95 port_pdata = dev_get_parent_plat(pdev);
96 err = ops->port_enable(dev, port_pdata->index,
101 err = ops->port_enable(dev, priv->cpu_port,
102 priv->cpu_port_fixed_phy);
107 return eth_get_ops(master)->start(master);
110 /* Stop the desired port, the CPU port and the master Eth interface */
111 static void dsa_port_stop(struct udevice *pdev)
113 struct udevice *dev = dev_get_parent(pdev);
114 struct dsa_priv *priv = dev_get_uclass_priv(dev);
115 struct udevice *master = dsa_get_master(dev);
116 struct dsa_ops *ops = dsa_get_ops(dev);
118 if (ops->port_disable) {
119 struct dsa_port_pdata *port_pdata;
121 port_pdata = dev_get_parent_plat(pdev);
122 ops->port_disable(dev, port_pdata->index, port_pdata->phy);
123 ops->port_disable(dev, priv->cpu_port, priv->cpu_port_fixed_phy);
126 eth_get_ops(master)->stop(master);
130 * Insert a DSA tag and call master Ethernet send on the resulting packet
131 * We copy the frame to a stack buffer where we have reserved headroom and
132 * tailroom space. Headroom and tailroom are set to 0.
134 static int dsa_port_send(struct udevice *pdev, void *packet, int length)
136 struct udevice *dev = dev_get_parent(pdev);
137 struct dsa_priv *priv = dev_get_uclass_priv(dev);
138 int head = priv->headroom, tail = priv->tailroom;
139 struct udevice *master = dsa_get_master(dev);
140 struct dsa_ops *ops = dsa_get_ops(dev);
141 uchar dsa_packet_tmp[PKTSIZE_ALIGN];
142 struct dsa_port_pdata *port_pdata;
145 if (length + head + tail > PKTSIZE_ALIGN)
148 memset(dsa_packet_tmp, 0, head);
149 memset(dsa_packet_tmp + head + length, 0, tail);
150 memcpy(dsa_packet_tmp + head, packet, length);
151 length += head + tail;
152 /* copy back to preserve original buffer alignment */
153 memcpy(packet, dsa_packet_tmp, length);
155 port_pdata = dev_get_parent_plat(pdev);
156 err = ops->xmit(dev, port_pdata->index, packet, length);
160 return eth_get_ops(master)->send(master, packet, length);
163 /* Receive a frame from master Ethernet, process it and pass it on */
164 static int dsa_port_recv(struct udevice *pdev, int flags, uchar **packetp)
166 struct udevice *dev = dev_get_parent(pdev);
167 struct dsa_priv *priv = dev_get_uclass_priv(dev);
168 int head = priv->headroom, tail = priv->tailroom;
169 struct udevice *master = dsa_get_master(dev);
170 struct dsa_ops *ops = dsa_get_ops(dev);
171 struct dsa_port_pdata *port_pdata;
172 int length, port_index, err;
174 length = eth_get_ops(master)->recv(master, flags, packetp);
179 * If we receive frames from a different port or frames that DSA driver
180 * doesn't like we discard them here.
181 * In case of discard we return with no frame and expect to be called
182 * again instead of looping here, so upper layer can deal with timeouts.
184 port_pdata = dev_get_parent_plat(pdev);
185 err = ops->rcv(dev, &port_index, *packetp, length);
186 if (err || port_index != port_pdata->index || (length <= head + tail)) {
187 if (eth_get_ops(master)->free_pkt)
188 eth_get_ops(master)->free_pkt(master, *packetp, length);
193 * We move the pointer over headroom here to avoid a copy. If free_pkt
194 * gets called we move the pointer back before calling master free_pkt.
198 return length - head - tail;
201 static int dsa_port_free_pkt(struct udevice *pdev, uchar *packet, int length)
203 struct udevice *dev = dev_get_parent(pdev);
204 struct udevice *master = dsa_get_master(dev);
205 struct dsa_priv *priv;
207 priv = dev_get_uclass_priv(dev);
208 if (eth_get_ops(master)->free_pkt) {
209 /* return the original pointer and length to master Eth */
210 packet -= priv->headroom;
211 length += priv->headroom - priv->tailroom;
213 return eth_get_ops(master)->free_pkt(master, packet, length);
219 static int dsa_port_of_to_pdata(struct udevice *pdev)
221 struct dsa_port_pdata *port_pdata;
222 struct eth_pdata *eth_pdata;
230 err = ofnode_read_u32(dev_ofnode(pdev), "reg", &index);
234 port_pdata = dev_get_parent_plat(pdev);
235 port_pdata->index = index;
237 label = ofnode_read_string(dev_ofnode(pdev), "label");
239 strlcpy(port_pdata->name, label, DSA_PORT_NAME_LENGTH);
241 eth_pdata = dev_get_plat(pdev);
242 eth_pdata->priv_pdata = port_pdata;
244 dev_dbg(pdev, "port %d node %s\n", port_pdata->index,
245 ofnode_get_name(dev_ofnode(pdev)));
250 static const struct eth_ops dsa_port_ops = {
251 .start = dsa_port_start,
252 .send = dsa_port_send,
253 .recv = dsa_port_recv,
254 .stop = dsa_port_stop,
255 .free_pkt = dsa_port_free_pkt,
259 * Inherit port's hwaddr from the DSA master, unless the port already has a
260 * unique MAC address specified in the environment.
262 static void dsa_port_set_hwaddr(struct udevice *pdev, struct udevice *master)
264 struct eth_pdata *eth_pdata, *master_pdata;
265 unsigned char env_enetaddr[ARP_HLEN];
267 eth_env_get_enetaddr_by_index("eth", dev_seq(pdev), env_enetaddr);
268 if (!is_zero_ethaddr(env_enetaddr)) {
269 /* individual port mac addrs require master to be promisc */
270 struct eth_ops *eth_ops = eth_get_ops(master);
272 if (eth_ops->set_promisc)
273 eth_ops->set_promisc(master, true);
278 master_pdata = dev_get_plat(master);
279 eth_pdata = dev_get_plat(pdev);
280 memcpy(eth_pdata->enetaddr, master_pdata->enetaddr, ARP_HLEN);
281 eth_env_set_enetaddr_by_index("eth", dev_seq(pdev),
282 master_pdata->enetaddr);
285 static int dsa_port_probe(struct udevice *pdev)
287 struct udevice *dev = dev_get_parent(pdev);
288 struct dsa_ops *ops = dsa_get_ops(dev);
289 struct dsa_port_pdata *port_pdata;
290 struct udevice *master;
293 port_pdata = dev_get_parent_plat(pdev);
295 port_pdata->phy = dm_eth_phy_connect(pdev);
296 if (!port_pdata->phy)
299 master = dsa_get_master(dev);
304 * Probe the master device. We depend on the master device for proper
305 * operation and we also need it for MAC inheritance below.
307 * TODO: we assume the master device is always there and doesn't get
308 * removed during runtime.
310 err = device_probe(master);
314 dsa_port_set_hwaddr(pdev, master);
316 if (ops->port_probe) {
317 err = ops->port_probe(dev, port_pdata->index,
326 static int dsa_port_remove(struct udevice *pdev)
328 struct dsa_port_pdata *port_pdata = dev_get_parent_plat(pdev);
330 port_pdata->phy = NULL;
335 U_BOOT_DRIVER(dsa_port) = {
336 .name = DSA_PORT_CHILD_DRV_NAME,
338 .ops = &dsa_port_ops,
339 .probe = dsa_port_probe,
340 .remove = dsa_port_remove,
341 .of_to_plat = dsa_port_of_to_pdata,
342 .plat_auto = sizeof(struct eth_pdata),
346 * This function mostly deals with pulling information out of the device tree
347 * into the pdata structure.
348 * It goes through the list of switch ports, registers an eth device for each
349 * front panel port and identifies the cpu port connected to master eth device.
350 * TODO: support cascaded switches
352 static int dsa_post_bind(struct udevice *dev)
354 struct dsa_pdata *pdata = dev_get_uclass_plat(dev);
355 ofnode node = dev_ofnode(dev), pnode;
356 int i, err, first_err = 0;
358 if (!ofnode_valid(node))
361 pdata->master_node = ofnode_null();
363 node = ofnode_find_subnode(node, "ports");
364 if (!ofnode_valid(node))
365 node = ofnode_find_subnode(node, "ethernet-ports");
366 if (!ofnode_valid(node)) {
367 dev_err(dev, "ports node is missing under DSA device!\n");
371 pdata->num_ports = ofnode_get_child_count(node);
372 if (pdata->num_ports <= 0 || pdata->num_ports > DSA_MAX_PORTS) {
373 dev_err(dev, "invalid number of ports (%d)\n",
378 /* look for the CPU port */
379 ofnode_for_each_subnode(pnode, node) {
382 if (ofnode_read_u32(pnode, "ethernet", ðernet))
385 pdata->master_node = ofnode_get_by_phandle(ethernet);
386 pdata->cpu_port_node = pnode;
390 if (!ofnode_valid(pdata->master_node)) {
391 dev_err(dev, "master eth node missing!\n");
395 if (ofnode_read_u32(pnode, "reg", &pdata->cpu_port)) {
396 dev_err(dev, "CPU port node not valid!\n");
400 dev_dbg(dev, "master node %s on port %d\n",
401 ofnode_get_name(pdata->master_node), pdata->cpu_port);
403 for (i = 0; i < pdata->num_ports; i++) {
404 char name[DSA_PORT_NAME_LENGTH];
405 struct udevice *pdev;
408 * If this is the CPU port don't register it as an ETH device,
409 * we skip it on purpose since I/O to/from it from the CPU
412 if (i == pdata->cpu_port)
416 * Set up default port names. If present, DT port labels
417 * will override the default port names.
419 snprintf(name, DSA_PORT_NAME_LENGTH, "%s@%d", dev->name, i);
421 ofnode_for_each_subnode(pnode, node) {
424 if (ofnode_read_u32(pnode, "reg", ®))
432 * skip registration if port id not found or if the port
433 * is explicitly disabled in DT
435 if (!ofnode_valid(pnode) || !ofnode_is_available(pnode))
438 err = device_bind_driver_to_node(dev, DSA_PORT_CHILD_DRV_NAME,
441 struct dsa_port_pdata *port_pdata;
443 port_pdata = dev_get_parent_plat(pdev);
444 strlcpy(port_pdata->name, name, DSA_PORT_NAME_LENGTH);
445 pdev->name = port_pdata->name;
448 /* try to bind all ports but keep 1st error */
449 if (err && !first_err)
456 dev_dbg(dev, "DSA ports successfully bound\n");
462 * Initialize the uclass per device internal state structure (priv).
463 * TODO: pick up references to other switch devices here, if we're cascaded.
465 static int dsa_pre_probe(struct udevice *dev)
467 struct dsa_pdata *pdata = dev_get_uclass_plat(dev);
468 struct dsa_priv *priv = dev_get_uclass_priv(dev);
469 struct dsa_ops *ops = dsa_get_ops(dev);
472 priv->num_ports = pdata->num_ports;
473 priv->cpu_port = pdata->cpu_port;
474 priv->cpu_port_fixed_phy = fixed_phy_create(pdata->cpu_port_node);
475 if (!priv->cpu_port_fixed_phy) {
476 dev_err(dev, "Failed to register fixed-link for CPU port\n");
480 err = uclass_get_device_by_ofnode(UCLASS_ETH, pdata->master_node,
485 /* Simulate a probing event for the CPU port */
486 if (ops->port_probe) {
487 err = ops->port_probe(dev, priv->cpu_port,
488 priv->cpu_port_fixed_phy);
496 UCLASS_DRIVER(dsa) = {
499 .post_bind = dsa_post_bind,
500 .pre_probe = dsa_pre_probe,
501 .per_device_auto = sizeof(struct dsa_priv),
502 .per_device_plat_auto = sizeof(struct dsa_pdata),
503 .per_child_plat_auto = sizeof(struct dsa_port_pdata),
504 .flags = DM_UC_FLAG_SEQ_ALIAS,