1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * This file is based on code from OCTEON SDK by Cavium Networks.
4  *
5  * Copyright (c) 2003-2007 Cavium Networks
6  */
7 
8 #include <linux/platform_device.h>
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/netdevice.h>
12 #include <linux/etherdevice.h>
13 #include <linux/phy.h>
14 #include <linux/slab.h>
15 #include <linux/interrupt.h>
16 #include <linux/of_mdio.h>
17 #include <linux/of_net.h>
18 #include <linux/if_ether.h>
19 #include <linux/if_vlan.h>
20 
21 #include <net/dst.h>
22 
23 #include "octeon-ethernet.h"
24 #include "ethernet-defines.h"
25 #include "ethernet-mem.h"
26 #include "ethernet-rx.h"
27 #include "ethernet-tx.h"
28 #include "ethernet-mdio.h"
29 #include "ethernet-util.h"
30 
31 #define OCTEON_MAX_MTU 65392
32 
33 static int num_packet_buffers = 1024;
34 module_param(num_packet_buffers, int, 0444);
35 MODULE_PARM_DESC(num_packet_buffers, "\n"
36 	"\tNumber of packet buffers to allocate and store in the\n"
37 	"\tFPA. By default, 1024 packet buffers are used.\n");
38 
39 static int pow_receive_group = 15;
40 module_param(pow_receive_group, int, 0444);
41 MODULE_PARM_DESC(pow_receive_group, "\n"
42 	"\tPOW group to receive packets from. All ethernet hardware\n"
43 	"\twill be configured to send incoming packets to this POW\n"
44 	"\tgroup. Also any other software can submit packets to this\n"
45 	"\tgroup for the kernel to process.");
46 
47 static int receive_group_order;
48 module_param(receive_group_order, int, 0444);
49 MODULE_PARM_DESC(receive_group_order, "\n"
50 	"\tOrder (0..4) of receive groups to take into use. Ethernet hardware\n"
51 	"\twill be configured to send incoming packets to multiple POW\n"
52 	"\tgroups. pow_receive_group parameter is ignored when multiple\n"
53 	"\tgroups are taken into use and groups are allocated starting\n"
54 	"\tfrom 0. By default, a single group is used.\n");
55 
56 int pow_send_group = -1;
57 module_param(pow_send_group, int, 0644);
58 MODULE_PARM_DESC(pow_send_group, "\n"
59 	"\tPOW group to send packets to other software on. This\n"
60 	"\tcontrols the creation of the virtual device pow0.\n"
61 	"\talways_use_pow also depends on this value.");
62 
63 int always_use_pow;
64 module_param(always_use_pow, int, 0444);
65 MODULE_PARM_DESC(always_use_pow, "\n"
66 	"\tWhen set, always send to the pow group. This will cause\n"
67 	"\tpackets sent to real ethernet devices to be sent to the\n"
68 	"\tPOW group instead of the hardware. Unless some other\n"
69 	"\tapplication changes the config, packets will still be\n"
70 	"\treceived from the low level hardware. Use this option\n"
71 	"\tto allow a CVMX app to intercept all packets from the\n"
72 	"\tlinux kernel. You must specify pow_send_group along with\n"
73 	"\tthis option.");
74 
75 char pow_send_list[128] = "";
76 module_param_string(pow_send_list, pow_send_list, sizeof(pow_send_list), 0444);
77 MODULE_PARM_DESC(pow_send_list, "\n"
78 	"\tComma separated list of ethernet devices that should use the\n"
79 	"\tPOW for transmit instead of the actual ethernet hardware. This\n"
80 	"\tis a per port version of always_use_pow. always_use_pow takes\n"
81 	"\tprecedence over this list. For example, setting this to\n"
82 	"\t\"eth2,spi3,spi7\" would cause these three devices to transmit\n"
83 	"\tusing the pow_send_group.");
84 
85 int rx_napi_weight = 32;
86 module_param(rx_napi_weight, int, 0444);
87 MODULE_PARM_DESC(rx_napi_weight, "The NAPI WEIGHT parameter.");
88 
89 /* Mask indicating which receive groups are in use. */
90 int pow_receive_groups;
91 
92 /*
93  * cvm_oct_poll_queue_stopping - flag to indicate polling should stop.
94  *
95  * Set to one right before cvm_oct_poll_queue is destroyed.
96  */
97 atomic_t cvm_oct_poll_queue_stopping = ATOMIC_INIT(0);
98 
99 /*
100  * Array of every ethernet device owned by this driver indexed by
101  * the ipd input port number.
102  */
103 struct net_device *cvm_oct_device[TOTAL_NUMBER_OF_PORTS];
104 
105 u64 cvm_oct_tx_poll_interval;
106 
107 static void cvm_oct_rx_refill_worker(struct work_struct *work);
108 static DECLARE_DELAYED_WORK(cvm_oct_rx_refill_work, cvm_oct_rx_refill_worker);
109 
cvm_oct_rx_refill_worker(struct work_struct * work)110 static void cvm_oct_rx_refill_worker(struct work_struct *work)
111 {
112 	/*
113 	 * FPA 0 may have been drained, try to refill it if we need
114 	 * more than num_packet_buffers / 2, otherwise normal receive
115 	 * processing will refill it.  If it were drained, no packets
116 	 * could be received so cvm_oct_napi_poll would never be
117 	 * invoked to do the refill.
118 	 */
119 	cvm_oct_rx_refill_pool(num_packet_buffers / 2);
120 
121 	if (!atomic_read(&cvm_oct_poll_queue_stopping))
122 		schedule_delayed_work(&cvm_oct_rx_refill_work, HZ);
123 }
124 
cvm_oct_periodic_worker(struct work_struct * work)125 static void cvm_oct_periodic_worker(struct work_struct *work)
126 {
127 	struct octeon_ethernet *priv = container_of(work,
128 						    struct octeon_ethernet,
129 						    port_periodic_work.work);
130 
131 	if (priv->poll)
132 		priv->poll(cvm_oct_device[priv->port]);
133 
134 	cvm_oct_device[priv->port]->netdev_ops->ndo_get_stats
135 						(cvm_oct_device[priv->port]);
136 
137 	if (!atomic_read(&cvm_oct_poll_queue_stopping))
138 		schedule_delayed_work(&priv->port_periodic_work, HZ);
139 }
140 
cvm_oct_configure_common_hw(void)141 static void cvm_oct_configure_common_hw(void)
142 {
143 	/* Setup the FPA */
144 	cvmx_fpa_enable();
145 	cvm_oct_mem_fill_fpa(CVMX_FPA_PACKET_POOL, CVMX_FPA_PACKET_POOL_SIZE,
146 			     num_packet_buffers);
147 	cvm_oct_mem_fill_fpa(CVMX_FPA_WQE_POOL, CVMX_FPA_WQE_POOL_SIZE,
148 			     num_packet_buffers);
149 	if (CVMX_FPA_OUTPUT_BUFFER_POOL != CVMX_FPA_PACKET_POOL)
150 		cvm_oct_mem_fill_fpa(CVMX_FPA_OUTPUT_BUFFER_POOL,
151 				     CVMX_FPA_OUTPUT_BUFFER_POOL_SIZE, 1024);
152 
153 #ifdef __LITTLE_ENDIAN
154 	{
155 		union cvmx_ipd_ctl_status ipd_ctl_status;
156 
157 		ipd_ctl_status.u64 = cvmx_read_csr(CVMX_IPD_CTL_STATUS);
158 		ipd_ctl_status.s.pkt_lend = 1;
159 		ipd_ctl_status.s.wqe_lend = 1;
160 		cvmx_write_csr(CVMX_IPD_CTL_STATUS, ipd_ctl_status.u64);
161 	}
162 #endif
163 
164 	cvmx_helper_setup_red(num_packet_buffers / 4, num_packet_buffers / 8);
165 }
166 
167 /**
168  * cvm_oct_free_work- Free a work queue entry
169  *
170  * @work_queue_entry: Work queue entry to free
171  *
172  * Returns Zero on success, Negative on failure.
173  */
cvm_oct_free_work(void * work_queue_entry)174 int cvm_oct_free_work(void *work_queue_entry)
175 {
176 	struct cvmx_wqe *work = work_queue_entry;
177 
178 	int segments = work->word2.s.bufs;
179 	union cvmx_buf_ptr segment_ptr = work->packet_ptr;
180 
181 	while (segments--) {
182 		union cvmx_buf_ptr next_ptr = *(union cvmx_buf_ptr *)
183 			cvmx_phys_to_ptr(segment_ptr.s.addr - 8);
184 		if (unlikely(!segment_ptr.s.i))
185 			cvmx_fpa_free(cvm_oct_get_buffer_ptr(segment_ptr),
186 				      segment_ptr.s.pool,
187 				      CVMX_FPA_PACKET_POOL_SIZE / 128);
188 		segment_ptr = next_ptr;
189 	}
190 	cvmx_fpa_free(work, CVMX_FPA_WQE_POOL, 1);
191 
192 	return 0;
193 }
194 EXPORT_SYMBOL(cvm_oct_free_work);
195 
196 /**
197  * cvm_oct_common_get_stats - get the low level ethernet statistics
198  * @dev:    Device to get the statistics from
199  *
200  * Returns Pointer to the statistics
201  */
cvm_oct_common_get_stats(struct net_device * dev)202 static struct net_device_stats *cvm_oct_common_get_stats(struct net_device *dev)
203 {
204 	cvmx_pip_port_status_t rx_status;
205 	cvmx_pko_port_status_t tx_status;
206 	struct octeon_ethernet *priv = netdev_priv(dev);
207 
208 	if (priv->port < CVMX_PIP_NUM_INPUT_PORTS) {
209 		if (octeon_is_simulation()) {
210 			/* The simulator doesn't support statistics */
211 			memset(&rx_status, 0, sizeof(rx_status));
212 			memset(&tx_status, 0, sizeof(tx_status));
213 		} else {
214 			cvmx_pip_get_port_status(priv->port, 1, &rx_status);
215 			cvmx_pko_get_port_status(priv->port, 1, &tx_status);
216 		}
217 
218 		dev->stats.rx_packets += rx_status.inb_packets;
219 		dev->stats.tx_packets += tx_status.packets;
220 		dev->stats.rx_bytes += rx_status.inb_octets;
221 		dev->stats.tx_bytes += tx_status.octets;
222 		dev->stats.multicast += rx_status.multicast_packets;
223 		dev->stats.rx_crc_errors += rx_status.inb_errors;
224 		dev->stats.rx_frame_errors += rx_status.fcs_align_err_packets;
225 		dev->stats.rx_dropped += rx_status.dropped_packets;
226 	}
227 
228 	return &dev->stats;
229 }
230 
231 /**
232  * cvm_oct_common_change_mtu - change the link MTU
233  * @dev:     Device to change
234  * @new_mtu: The new MTU
235  *
236  * Returns Zero on success
237  */
cvm_oct_common_change_mtu(struct net_device * dev,int new_mtu)238 static int cvm_oct_common_change_mtu(struct net_device *dev, int new_mtu)
239 {
240 	struct octeon_ethernet *priv = netdev_priv(dev);
241 	int interface = INTERFACE(priv->port);
242 #if IS_ENABLED(CONFIG_VLAN_8021Q)
243 	int vlan_bytes = VLAN_HLEN;
244 #else
245 	int vlan_bytes = 0;
246 #endif
247 	int mtu_overhead = ETH_HLEN + ETH_FCS_LEN + vlan_bytes;
248 
249 	dev->mtu = new_mtu;
250 
251 	if ((interface < 2) &&
252 	    (cvmx_helper_interface_get_mode(interface) !=
253 		CVMX_HELPER_INTERFACE_MODE_SPI)) {
254 		int index = INDEX(priv->port);
255 		/* Add ethernet header and FCS, and VLAN if configured. */
256 		int max_packet = new_mtu + mtu_overhead;
257 
258 		if (OCTEON_IS_MODEL(OCTEON_CN3XXX) ||
259 		    OCTEON_IS_MODEL(OCTEON_CN58XX)) {
260 			/* Signal errors on packets larger than the MTU */
261 			cvmx_write_csr(CVMX_GMXX_RXX_FRM_MAX(index, interface),
262 				       max_packet);
263 		} else {
264 			/*
265 			 * Set the hardware to truncate packets larger
266 			 * than the MTU and smaller the 64 bytes.
267 			 */
268 			union cvmx_pip_frm_len_chkx frm_len_chk;
269 
270 			frm_len_chk.u64 = 0;
271 			frm_len_chk.s.minlen = VLAN_ETH_ZLEN;
272 			frm_len_chk.s.maxlen = max_packet;
273 			cvmx_write_csr(CVMX_PIP_FRM_LEN_CHKX(interface),
274 				       frm_len_chk.u64);
275 		}
276 		/*
277 		 * Set the hardware to truncate packets larger than
278 		 * the MTU. The jabber register must be set to a
279 		 * multiple of 8 bytes, so round up.
280 		 */
281 		cvmx_write_csr(CVMX_GMXX_RXX_JABBER(index, interface),
282 			       (max_packet + 7) & ~7u);
283 	}
284 	return 0;
285 }
286 
287 /**
288  * cvm_oct_common_set_multicast_list - set the multicast list
289  * @dev:    Device to work on
290  */
cvm_oct_common_set_multicast_list(struct net_device * dev)291 static void cvm_oct_common_set_multicast_list(struct net_device *dev)
292 {
293 	union cvmx_gmxx_prtx_cfg gmx_cfg;
294 	struct octeon_ethernet *priv = netdev_priv(dev);
295 	int interface = INTERFACE(priv->port);
296 
297 	if ((interface < 2) &&
298 	    (cvmx_helper_interface_get_mode(interface) !=
299 		CVMX_HELPER_INTERFACE_MODE_SPI)) {
300 		union cvmx_gmxx_rxx_adr_ctl control;
301 		int index = INDEX(priv->port);
302 
303 		control.u64 = 0;
304 		control.s.bcst = 1;	/* Allow broadcast MAC addresses */
305 
306 		if (!netdev_mc_empty(dev) || (dev->flags & IFF_ALLMULTI) ||
307 		    (dev->flags & IFF_PROMISC))
308 			/* Force accept multicast packets */
309 			control.s.mcst = 2;
310 		else
311 			/* Force reject multicast packets */
312 			control.s.mcst = 1;
313 
314 		if (dev->flags & IFF_PROMISC)
315 			/*
316 			 * Reject matches if promisc. Since CAM is
317 			 * shut off, should accept everything.
318 			 */
319 			control.s.cam_mode = 0;
320 		else
321 			/* Filter packets based on the CAM */
322 			control.s.cam_mode = 1;
323 
324 		gmx_cfg.u64 =
325 		    cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface));
326 		cvmx_write_csr(CVMX_GMXX_PRTX_CFG(index, interface),
327 			       gmx_cfg.u64 & ~1ull);
328 
329 		cvmx_write_csr(CVMX_GMXX_RXX_ADR_CTL(index, interface),
330 			       control.u64);
331 		if (dev->flags & IFF_PROMISC)
332 			cvmx_write_csr(CVMX_GMXX_RXX_ADR_CAM_EN
333 				       (index, interface), 0);
334 		else
335 			cvmx_write_csr(CVMX_GMXX_RXX_ADR_CAM_EN
336 				       (index, interface), 1);
337 
338 		cvmx_write_csr(CVMX_GMXX_PRTX_CFG(index, interface),
339 			       gmx_cfg.u64);
340 	}
341 }
342 
cvm_oct_set_mac_filter(struct net_device * dev)343 static int cvm_oct_set_mac_filter(struct net_device *dev)
344 {
345 	struct octeon_ethernet *priv = netdev_priv(dev);
346 	union cvmx_gmxx_prtx_cfg gmx_cfg;
347 	int interface = INTERFACE(priv->port);
348 
349 	if ((interface < 2) &&
350 	    (cvmx_helper_interface_get_mode(interface) !=
351 		CVMX_HELPER_INTERFACE_MODE_SPI)) {
352 		int i;
353 		const u8 *ptr = dev->dev_addr;
354 		u64 mac = 0;
355 		int index = INDEX(priv->port);
356 
357 		for (i = 0; i < 6; i++)
358 			mac = (mac << 8) | (u64)ptr[i];
359 
360 		gmx_cfg.u64 =
361 		    cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface));
362 		cvmx_write_csr(CVMX_GMXX_PRTX_CFG(index, interface),
363 			       gmx_cfg.u64 & ~1ull);
364 
365 		cvmx_write_csr(CVMX_GMXX_SMACX(index, interface), mac);
366 		cvmx_write_csr(CVMX_GMXX_RXX_ADR_CAM0(index, interface),
367 			       ptr[0]);
368 		cvmx_write_csr(CVMX_GMXX_RXX_ADR_CAM1(index, interface),
369 			       ptr[1]);
370 		cvmx_write_csr(CVMX_GMXX_RXX_ADR_CAM2(index, interface),
371 			       ptr[2]);
372 		cvmx_write_csr(CVMX_GMXX_RXX_ADR_CAM3(index, interface),
373 			       ptr[3]);
374 		cvmx_write_csr(CVMX_GMXX_RXX_ADR_CAM4(index, interface),
375 			       ptr[4]);
376 		cvmx_write_csr(CVMX_GMXX_RXX_ADR_CAM5(index, interface),
377 			       ptr[5]);
378 		cvm_oct_common_set_multicast_list(dev);
379 		cvmx_write_csr(CVMX_GMXX_PRTX_CFG(index, interface),
380 			       gmx_cfg.u64);
381 	}
382 	return 0;
383 }
384 
385 /**
386  * cvm_oct_common_set_mac_address - set the hardware MAC address for a device
387  * @dev:    The device in question.
388  * @addr:   Socket address.
389  *
390  * Returns Zero on success
391  */
cvm_oct_common_set_mac_address(struct net_device * dev,void * addr)392 static int cvm_oct_common_set_mac_address(struct net_device *dev, void *addr)
393 {
394 	int r = eth_mac_addr(dev, addr);
395 
396 	if (r)
397 		return r;
398 	return cvm_oct_set_mac_filter(dev);
399 }
400 
401 /**
402  * cvm_oct_common_init - per network device initialization
403  * @dev:    Device to initialize
404  *
405  * Returns Zero on success
406  */
cvm_oct_common_init(struct net_device * dev)407 int cvm_oct_common_init(struct net_device *dev)
408 {
409 	struct octeon_ethernet *priv = netdev_priv(dev);
410 	int ret;
411 
412 	ret = of_get_ethdev_address(priv->of_node, dev);
413 	if (ret)
414 		eth_hw_addr_random(dev);
415 
416 	/*
417 	 * Force the interface to use the POW send if always_use_pow
418 	 * was specified or it is in the pow send list.
419 	 */
420 	if ((pow_send_group != -1) &&
421 	    (always_use_pow || strstr(pow_send_list, dev->name)))
422 		priv->queue = -1;
423 
424 	if (priv->queue != -1)
425 		dev->features |= NETIF_F_SG | NETIF_F_IP_CSUM;
426 
427 	/* We do our own locking, Linux doesn't need to */
428 	dev->features |= NETIF_F_LLTX;
429 	dev->ethtool_ops = &cvm_oct_ethtool_ops;
430 
431 	cvm_oct_set_mac_filter(dev);
432 	dev_set_mtu(dev, dev->mtu);
433 
434 	/*
435 	 * Zero out stats for port so we won't mistakenly show
436 	 * counters from the bootloader.
437 	 */
438 	memset(dev->netdev_ops->ndo_get_stats(dev), 0,
439 	       sizeof(struct net_device_stats));
440 
441 	if (dev->netdev_ops->ndo_stop)
442 		dev->netdev_ops->ndo_stop(dev);
443 
444 	return 0;
445 }
446 
cvm_oct_common_uninit(struct net_device * dev)447 void cvm_oct_common_uninit(struct net_device *dev)
448 {
449 	if (dev->phydev)
450 		phy_disconnect(dev->phydev);
451 }
452 
cvm_oct_common_open(struct net_device * dev,void (* link_poll)(struct net_device *))453 int cvm_oct_common_open(struct net_device *dev,
454 			void (*link_poll)(struct net_device *))
455 {
456 	union cvmx_gmxx_prtx_cfg gmx_cfg;
457 	struct octeon_ethernet *priv = netdev_priv(dev);
458 	int interface = INTERFACE(priv->port);
459 	int index = INDEX(priv->port);
460 	union cvmx_helper_link_info link_info;
461 	int rv;
462 
463 	rv = cvm_oct_phy_setup_device(dev);
464 	if (rv)
465 		return rv;
466 
467 	gmx_cfg.u64 = cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface));
468 	gmx_cfg.s.en = 1;
469 	if (octeon_has_feature(OCTEON_FEATURE_PKND))
470 		gmx_cfg.s.pknd = priv->port;
471 	cvmx_write_csr(CVMX_GMXX_PRTX_CFG(index, interface), gmx_cfg.u64);
472 
473 	if (octeon_is_simulation())
474 		return 0;
475 
476 	if (dev->phydev) {
477 		int r = phy_read_status(dev->phydev);
478 
479 		if (r == 0 && dev->phydev->link == 0)
480 			netif_carrier_off(dev);
481 		cvm_oct_adjust_link(dev);
482 	} else {
483 		link_info = cvmx_helper_link_get(priv->port);
484 		if (!link_info.s.link_up)
485 			netif_carrier_off(dev);
486 		priv->poll = link_poll;
487 		link_poll(dev);
488 	}
489 
490 	return 0;
491 }
492 
cvm_oct_link_poll(struct net_device * dev)493 void cvm_oct_link_poll(struct net_device *dev)
494 {
495 	struct octeon_ethernet *priv = netdev_priv(dev);
496 	union cvmx_helper_link_info link_info;
497 
498 	link_info = cvmx_helper_link_get(priv->port);
499 	if (link_info.u64 == priv->link_info)
500 		return;
501 
502 	if (cvmx_helper_link_set(priv->port, link_info))
503 		link_info.u64 = priv->link_info;
504 	else
505 		priv->link_info = link_info.u64;
506 
507 	if (link_info.s.link_up) {
508 		if (!netif_carrier_ok(dev))
509 			netif_carrier_on(dev);
510 	} else if (netif_carrier_ok(dev)) {
511 		netif_carrier_off(dev);
512 	}
513 	cvm_oct_note_carrier(priv, link_info);
514 }
515 
cvm_oct_xaui_open(struct net_device * dev)516 static int cvm_oct_xaui_open(struct net_device *dev)
517 {
518 	return cvm_oct_common_open(dev, cvm_oct_link_poll);
519 }
520 
521 static const struct net_device_ops cvm_oct_npi_netdev_ops = {
522 	.ndo_init		= cvm_oct_common_init,
523 	.ndo_uninit		= cvm_oct_common_uninit,
524 	.ndo_start_xmit		= cvm_oct_xmit,
525 	.ndo_set_rx_mode	= cvm_oct_common_set_multicast_list,
526 	.ndo_set_mac_address	= cvm_oct_common_set_mac_address,
527 	.ndo_eth_ioctl		= cvm_oct_ioctl,
528 	.ndo_change_mtu		= cvm_oct_common_change_mtu,
529 	.ndo_get_stats		= cvm_oct_common_get_stats,
530 #ifdef CONFIG_NET_POLL_CONTROLLER
531 	.ndo_poll_controller	= cvm_oct_poll_controller,
532 #endif
533 };
534 
535 static const struct net_device_ops cvm_oct_xaui_netdev_ops = {
536 	.ndo_init		= cvm_oct_common_init,
537 	.ndo_uninit		= cvm_oct_common_uninit,
538 	.ndo_open		= cvm_oct_xaui_open,
539 	.ndo_stop		= cvm_oct_common_stop,
540 	.ndo_start_xmit		= cvm_oct_xmit,
541 	.ndo_set_rx_mode	= cvm_oct_common_set_multicast_list,
542 	.ndo_set_mac_address	= cvm_oct_common_set_mac_address,
543 	.ndo_eth_ioctl		= cvm_oct_ioctl,
544 	.ndo_change_mtu		= cvm_oct_common_change_mtu,
545 	.ndo_get_stats		= cvm_oct_common_get_stats,
546 #ifdef CONFIG_NET_POLL_CONTROLLER
547 	.ndo_poll_controller	= cvm_oct_poll_controller,
548 #endif
549 };
550 
551 static const struct net_device_ops cvm_oct_sgmii_netdev_ops = {
552 	.ndo_init		= cvm_oct_sgmii_init,
553 	.ndo_uninit		= cvm_oct_common_uninit,
554 	.ndo_open		= cvm_oct_sgmii_open,
555 	.ndo_stop		= cvm_oct_common_stop,
556 	.ndo_start_xmit		= cvm_oct_xmit,
557 	.ndo_set_rx_mode	= cvm_oct_common_set_multicast_list,
558 	.ndo_set_mac_address	= cvm_oct_common_set_mac_address,
559 	.ndo_eth_ioctl		= cvm_oct_ioctl,
560 	.ndo_change_mtu		= cvm_oct_common_change_mtu,
561 	.ndo_get_stats		= cvm_oct_common_get_stats,
562 #ifdef CONFIG_NET_POLL_CONTROLLER
563 	.ndo_poll_controller	= cvm_oct_poll_controller,
564 #endif
565 };
566 
567 static const struct net_device_ops cvm_oct_spi_netdev_ops = {
568 	.ndo_init		= cvm_oct_spi_init,
569 	.ndo_uninit		= cvm_oct_spi_uninit,
570 	.ndo_start_xmit		= cvm_oct_xmit,
571 	.ndo_set_rx_mode	= cvm_oct_common_set_multicast_list,
572 	.ndo_set_mac_address	= cvm_oct_common_set_mac_address,
573 	.ndo_eth_ioctl		= cvm_oct_ioctl,
574 	.ndo_change_mtu		= cvm_oct_common_change_mtu,
575 	.ndo_get_stats		= cvm_oct_common_get_stats,
576 #ifdef CONFIG_NET_POLL_CONTROLLER
577 	.ndo_poll_controller	= cvm_oct_poll_controller,
578 #endif
579 };
580 
581 static const struct net_device_ops cvm_oct_rgmii_netdev_ops = {
582 	.ndo_init		= cvm_oct_common_init,
583 	.ndo_uninit		= cvm_oct_common_uninit,
584 	.ndo_open		= cvm_oct_rgmii_open,
585 	.ndo_stop		= cvm_oct_common_stop,
586 	.ndo_start_xmit		= cvm_oct_xmit,
587 	.ndo_set_rx_mode	= cvm_oct_common_set_multicast_list,
588 	.ndo_set_mac_address	= cvm_oct_common_set_mac_address,
589 	.ndo_eth_ioctl		= cvm_oct_ioctl,
590 	.ndo_change_mtu		= cvm_oct_common_change_mtu,
591 	.ndo_get_stats		= cvm_oct_common_get_stats,
592 #ifdef CONFIG_NET_POLL_CONTROLLER
593 	.ndo_poll_controller	= cvm_oct_poll_controller,
594 #endif
595 };
596 
597 static const struct net_device_ops cvm_oct_pow_netdev_ops = {
598 	.ndo_init		= cvm_oct_common_init,
599 	.ndo_start_xmit		= cvm_oct_xmit_pow,
600 	.ndo_set_rx_mode	= cvm_oct_common_set_multicast_list,
601 	.ndo_set_mac_address	= cvm_oct_common_set_mac_address,
602 	.ndo_eth_ioctl		= cvm_oct_ioctl,
603 	.ndo_change_mtu		= cvm_oct_common_change_mtu,
604 	.ndo_get_stats		= cvm_oct_common_get_stats,
605 #ifdef CONFIG_NET_POLL_CONTROLLER
606 	.ndo_poll_controller	= cvm_oct_poll_controller,
607 #endif
608 };
609 
cvm_oct_of_get_child(const struct device_node * parent,int reg_val)610 static struct device_node *cvm_oct_of_get_child
611 				(const struct device_node *parent, int reg_val)
612 {
613 	struct device_node *node;
614 	const __be32 *addr;
615 	int size;
616 
617 	for_each_child_of_node(parent, node) {
618 		addr = of_get_property(node, "reg", &size);
619 		if (addr && (be32_to_cpu(*addr) == reg_val))
620 			break;
621 	}
622 	return node;
623 }
624 
cvm_oct_node_for_port(struct device_node * pip,int interface,int port)625 static struct device_node *cvm_oct_node_for_port(struct device_node *pip,
626 						 int interface, int port)
627 {
628 	struct device_node *ni, *np;
629 
630 	ni = cvm_oct_of_get_child(pip, interface);
631 	if (!ni)
632 		return NULL;
633 
634 	np = cvm_oct_of_get_child(ni, port);
635 	of_node_put(ni);
636 
637 	return np;
638 }
639 
cvm_set_rgmii_delay(struct octeon_ethernet * priv,int iface,int port)640 static void cvm_set_rgmii_delay(struct octeon_ethernet *priv, int iface,
641 				int port)
642 {
643 	struct device_node *np = priv->of_node;
644 	u32 delay_value;
645 	bool rx_delay;
646 	bool tx_delay;
647 
648 	/* By default, both RX/TX delay is enabled in
649 	 * __cvmx_helper_rgmii_enable().
650 	 */
651 	rx_delay = true;
652 	tx_delay = true;
653 
654 	if (!of_property_read_u32(np, "rx-delay", &delay_value)) {
655 		cvmx_write_csr(CVMX_ASXX_RX_CLK_SETX(port, iface), delay_value);
656 		rx_delay = delay_value > 0;
657 	}
658 	if (!of_property_read_u32(np, "tx-delay", &delay_value)) {
659 		cvmx_write_csr(CVMX_ASXX_TX_CLK_SETX(port, iface), delay_value);
660 		tx_delay = delay_value > 0;
661 	}
662 
663 	if (!rx_delay && !tx_delay)
664 		priv->phy_mode = PHY_INTERFACE_MODE_RGMII_ID;
665 	else if (!rx_delay)
666 		priv->phy_mode = PHY_INTERFACE_MODE_RGMII_RXID;
667 	else if (!tx_delay)
668 		priv->phy_mode = PHY_INTERFACE_MODE_RGMII_TXID;
669 	else
670 		priv->phy_mode = PHY_INTERFACE_MODE_RGMII;
671 }
672 
cvm_oct_probe(struct platform_device * pdev)673 static int cvm_oct_probe(struct platform_device *pdev)
674 {
675 	int num_interfaces;
676 	int interface;
677 	int fau = FAU_NUM_PACKET_BUFFERS_TO_FREE;
678 	int qos;
679 	struct device_node *pip;
680 	int mtu_overhead = ETH_HLEN + ETH_FCS_LEN;
681 
682 #if IS_ENABLED(CONFIG_VLAN_8021Q)
683 	mtu_overhead += VLAN_HLEN;
684 #endif
685 
686 	pip = pdev->dev.of_node;
687 	if (!pip) {
688 		pr_err("Error: No 'pip' in /aliases\n");
689 		return -EINVAL;
690 	}
691 
692 	cvm_oct_configure_common_hw();
693 
694 	cvmx_helper_initialize_packet_io_global();
695 
696 	if (receive_group_order) {
697 		if (receive_group_order > 4)
698 			receive_group_order = 4;
699 		pow_receive_groups = (1 << (1 << receive_group_order)) - 1;
700 	} else {
701 		pow_receive_groups = BIT(pow_receive_group);
702 	}
703 
704 	/* Change the input group for all ports before input is enabled */
705 	num_interfaces = cvmx_helper_get_number_of_interfaces();
706 	for (interface = 0; interface < num_interfaces; interface++) {
707 		int num_ports = cvmx_helper_ports_on_interface(interface);
708 		int port;
709 
710 		for (port = cvmx_helper_get_ipd_port(interface, 0);
711 		     port < cvmx_helper_get_ipd_port(interface, num_ports);
712 		     port++) {
713 			union cvmx_pip_prt_tagx pip_prt_tagx;
714 
715 			pip_prt_tagx.u64 =
716 			    cvmx_read_csr(CVMX_PIP_PRT_TAGX(port));
717 
718 			if (receive_group_order) {
719 				int tag_mask;
720 
721 				/* We support only 16 groups at the moment, so
722 				 * always disable the two additional "hidden"
723 				 * tag_mask bits on CN68XX.
724 				 */
725 				if (OCTEON_IS_MODEL(OCTEON_CN68XX))
726 					pip_prt_tagx.u64 |= 0x3ull << 44;
727 
728 				tag_mask = ~((1 << receive_group_order) - 1);
729 				pip_prt_tagx.s.grptagbase	= 0;
730 				pip_prt_tagx.s.grptagmask	= tag_mask;
731 				pip_prt_tagx.s.grptag		= 1;
732 				pip_prt_tagx.s.tag_mode		= 0;
733 				pip_prt_tagx.s.inc_prt_flag	= 1;
734 				pip_prt_tagx.s.ip6_dprt_flag	= 1;
735 				pip_prt_tagx.s.ip4_dprt_flag	= 1;
736 				pip_prt_tagx.s.ip6_sprt_flag	= 1;
737 				pip_prt_tagx.s.ip4_sprt_flag	= 1;
738 				pip_prt_tagx.s.ip6_dst_flag	= 1;
739 				pip_prt_tagx.s.ip4_dst_flag	= 1;
740 				pip_prt_tagx.s.ip6_src_flag	= 1;
741 				pip_prt_tagx.s.ip4_src_flag	= 1;
742 				pip_prt_tagx.s.grp		= 0;
743 			} else {
744 				pip_prt_tagx.s.grptag	= 0;
745 				pip_prt_tagx.s.grp	= pow_receive_group;
746 			}
747 
748 			cvmx_write_csr(CVMX_PIP_PRT_TAGX(port),
749 				       pip_prt_tagx.u64);
750 		}
751 	}
752 
753 	cvmx_helper_ipd_and_packet_input_enable();
754 
755 	memset(cvm_oct_device, 0, sizeof(cvm_oct_device));
756 
757 	/*
758 	 * Initialize the FAU used for counting packet buffers that
759 	 * need to be freed.
760 	 */
761 	cvmx_fau_atomic_write32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0);
762 
763 	/* Initialize the FAU used for counting tx SKBs that need to be freed */
764 	cvmx_fau_atomic_write32(FAU_TOTAL_TX_TO_CLEAN, 0);
765 
766 	if ((pow_send_group != -1)) {
767 		struct net_device *dev;
768 
769 		dev = alloc_etherdev(sizeof(struct octeon_ethernet));
770 		if (dev) {
771 			/* Initialize the device private structure. */
772 			struct octeon_ethernet *priv = netdev_priv(dev);
773 
774 			SET_NETDEV_DEV(dev, &pdev->dev);
775 			dev->netdev_ops = &cvm_oct_pow_netdev_ops;
776 			priv->imode = CVMX_HELPER_INTERFACE_MODE_DISABLED;
777 			priv->port = CVMX_PIP_NUM_INPUT_PORTS;
778 			priv->queue = -1;
779 			strscpy(dev->name, "pow%d", sizeof(dev->name));
780 			for (qos = 0; qos < 16; qos++)
781 				skb_queue_head_init(&priv->tx_free_list[qos]);
782 			dev->min_mtu = VLAN_ETH_ZLEN - mtu_overhead;
783 			dev->max_mtu = OCTEON_MAX_MTU - mtu_overhead;
784 
785 			if (register_netdev(dev) < 0) {
786 				pr_err("Failed to register ethernet device for POW\n");
787 				free_netdev(dev);
788 			} else {
789 				cvm_oct_device[CVMX_PIP_NUM_INPUT_PORTS] = dev;
790 				pr_info("%s: POW send group %d, receive group %d\n",
791 					dev->name, pow_send_group,
792 					pow_receive_group);
793 			}
794 		} else {
795 			pr_err("Failed to allocate ethernet device for POW\n");
796 		}
797 	}
798 
799 	num_interfaces = cvmx_helper_get_number_of_interfaces();
800 	for (interface = 0; interface < num_interfaces; interface++) {
801 		cvmx_helper_interface_mode_t imode =
802 		    cvmx_helper_interface_get_mode(interface);
803 		int num_ports = cvmx_helper_ports_on_interface(interface);
804 		int port;
805 		int port_index;
806 
807 		for (port_index = 0,
808 		     port = cvmx_helper_get_ipd_port(interface, 0);
809 		     port < cvmx_helper_get_ipd_port(interface, num_ports);
810 		     port_index++, port++) {
811 			struct octeon_ethernet *priv;
812 			struct net_device *dev =
813 			    alloc_etherdev(sizeof(struct octeon_ethernet));
814 			if (!dev) {
815 				pr_err("Failed to allocate ethernet device for port %d\n",
816 				       port);
817 				continue;
818 			}
819 
820 			/* Initialize the device private structure. */
821 			SET_NETDEV_DEV(dev, &pdev->dev);
822 			priv = netdev_priv(dev);
823 			priv->netdev = dev;
824 			priv->of_node = cvm_oct_node_for_port(pip, interface,
825 							      port_index);
826 
827 			INIT_DELAYED_WORK(&priv->port_periodic_work,
828 					  cvm_oct_periodic_worker);
829 			priv->imode = imode;
830 			priv->port = port;
831 			priv->queue = cvmx_pko_get_base_queue(priv->port);
832 			priv->fau = fau - cvmx_pko_get_num_queues(port) * 4;
833 			priv->phy_mode = PHY_INTERFACE_MODE_NA;
834 			for (qos = 0; qos < 16; qos++)
835 				skb_queue_head_init(&priv->tx_free_list[qos]);
836 			for (qos = 0; qos < cvmx_pko_get_num_queues(port);
837 			     qos++)
838 				cvmx_fau_atomic_write32(priv->fau + qos * 4, 0);
839 			dev->min_mtu = VLAN_ETH_ZLEN - mtu_overhead;
840 			dev->max_mtu = OCTEON_MAX_MTU - mtu_overhead;
841 
842 			switch (priv->imode) {
843 			/* These types don't support ports to IPD/PKO */
844 			case CVMX_HELPER_INTERFACE_MODE_DISABLED:
845 			case CVMX_HELPER_INTERFACE_MODE_PCIE:
846 			case CVMX_HELPER_INTERFACE_MODE_PICMG:
847 				break;
848 
849 			case CVMX_HELPER_INTERFACE_MODE_NPI:
850 				dev->netdev_ops = &cvm_oct_npi_netdev_ops;
851 				strscpy(dev->name, "npi%d", sizeof(dev->name));
852 				break;
853 
854 			case CVMX_HELPER_INTERFACE_MODE_XAUI:
855 				dev->netdev_ops = &cvm_oct_xaui_netdev_ops;
856 				strscpy(dev->name, "xaui%d", sizeof(dev->name));
857 				break;
858 
859 			case CVMX_HELPER_INTERFACE_MODE_LOOP:
860 				dev->netdev_ops = &cvm_oct_npi_netdev_ops;
861 				strscpy(dev->name, "loop%d", sizeof(dev->name));
862 				break;
863 
864 			case CVMX_HELPER_INTERFACE_MODE_SGMII:
865 				priv->phy_mode = PHY_INTERFACE_MODE_SGMII;
866 				dev->netdev_ops = &cvm_oct_sgmii_netdev_ops;
867 				strscpy(dev->name, "eth%d", sizeof(dev->name));
868 				break;
869 
870 			case CVMX_HELPER_INTERFACE_MODE_SPI:
871 				dev->netdev_ops = &cvm_oct_spi_netdev_ops;
872 				strscpy(dev->name, "spi%d", sizeof(dev->name));
873 				break;
874 
875 			case CVMX_HELPER_INTERFACE_MODE_GMII:
876 				priv->phy_mode = PHY_INTERFACE_MODE_GMII;
877 				dev->netdev_ops = &cvm_oct_rgmii_netdev_ops;
878 				strscpy(dev->name, "eth%d", sizeof(dev->name));
879 				break;
880 
881 			case CVMX_HELPER_INTERFACE_MODE_RGMII:
882 				dev->netdev_ops = &cvm_oct_rgmii_netdev_ops;
883 				strscpy(dev->name, "eth%d", sizeof(dev->name));
884 				cvm_set_rgmii_delay(priv, interface,
885 						    port_index);
886 				break;
887 			}
888 
889 			if (priv->of_node && of_phy_is_fixed_link(priv->of_node)) {
890 				if (of_phy_register_fixed_link(priv->of_node)) {
891 					netdev_err(dev, "Failed to register fixed link for interface %d, port %d\n",
892 						   interface, priv->port);
893 					dev->netdev_ops = NULL;
894 				}
895 			}
896 
897 			if (!dev->netdev_ops) {
898 				free_netdev(dev);
899 			} else if (register_netdev(dev) < 0) {
900 				pr_err("Failed to register ethernet device for interface %d, port %d\n",
901 				       interface, priv->port);
902 				free_netdev(dev);
903 			} else {
904 				cvm_oct_device[priv->port] = dev;
905 				fau -=
906 				    cvmx_pko_get_num_queues(priv->port) *
907 				    sizeof(u32);
908 				schedule_delayed_work(&priv->port_periodic_work,
909 						      HZ);
910 			}
911 		}
912 	}
913 
914 	cvm_oct_tx_initialize();
915 	cvm_oct_rx_initialize();
916 
917 	/*
918 	 * 150 uS: about 10 1500-byte packets at 1GE.
919 	 */
920 	cvm_oct_tx_poll_interval = 150 * (octeon_get_clock_rate() / 1000000);
921 
922 	schedule_delayed_work(&cvm_oct_rx_refill_work, HZ);
923 
924 	return 0;
925 }
926 
cvm_oct_remove(struct platform_device * pdev)927 static int cvm_oct_remove(struct platform_device *pdev)
928 {
929 	int port;
930 
931 	cvmx_ipd_disable();
932 
933 	atomic_inc_return(&cvm_oct_poll_queue_stopping);
934 	cancel_delayed_work_sync(&cvm_oct_rx_refill_work);
935 
936 	cvm_oct_rx_shutdown();
937 	cvm_oct_tx_shutdown();
938 
939 	cvmx_pko_disable();
940 
941 	/* Free the ethernet devices */
942 	for (port = 0; port < TOTAL_NUMBER_OF_PORTS; port++) {
943 		if (cvm_oct_device[port]) {
944 			struct net_device *dev = cvm_oct_device[port];
945 			struct octeon_ethernet *priv = netdev_priv(dev);
946 
947 			cancel_delayed_work_sync(&priv->port_periodic_work);
948 
949 			cvm_oct_tx_shutdown_dev(dev);
950 			unregister_netdev(dev);
951 			free_netdev(dev);
952 			cvm_oct_device[port] = NULL;
953 		}
954 	}
955 
956 	cvmx_pko_shutdown();
957 
958 	cvmx_ipd_free_ptr();
959 
960 	/* Free the HW pools */
961 	cvm_oct_mem_empty_fpa(CVMX_FPA_PACKET_POOL, CVMX_FPA_PACKET_POOL_SIZE,
962 			      num_packet_buffers);
963 	cvm_oct_mem_empty_fpa(CVMX_FPA_WQE_POOL, CVMX_FPA_WQE_POOL_SIZE,
964 			      num_packet_buffers);
965 	if (CVMX_FPA_OUTPUT_BUFFER_POOL != CVMX_FPA_PACKET_POOL)
966 		cvm_oct_mem_empty_fpa(CVMX_FPA_OUTPUT_BUFFER_POOL,
967 				      CVMX_FPA_OUTPUT_BUFFER_POOL_SIZE, 128);
968 	return 0;
969 }
970 
971 static const struct of_device_id cvm_oct_match[] = {
972 	{
973 		.compatible = "cavium,octeon-3860-pip",
974 	},
975 	{},
976 };
977 MODULE_DEVICE_TABLE(of, cvm_oct_match);
978 
979 static struct platform_driver cvm_oct_driver = {
980 	.probe		= cvm_oct_probe,
981 	.remove		= cvm_oct_remove,
982 	.driver		= {
983 		.name	= KBUILD_MODNAME,
984 		.of_match_table = cvm_oct_match,
985 	},
986 };
987 
988 module_platform_driver(cvm_oct_driver);
989 
990 MODULE_SOFTDEP("pre: mdio-cavium");
991 MODULE_LICENSE("GPL");
992 MODULE_AUTHOR("Cavium Networks <support@caviumnetworks.com>");
993 MODULE_DESCRIPTION("Cavium Networks Octeon ethernet driver.");
994