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drm/nouveau: consume the return of large GSP message
[drm/drm-misc.git] / drivers / net / ethernet / cortina / gemini.c
blob991e3839858b5284a4c4c6cce97150878893df05
1 // SPDX-License-Identifier: GPL-2.0
2 /* Ethernet device driver for Cortina Systems Gemini SoC
3 * Also known as the StorLink SL3512 and SL3516 (SL351x) or Lepus
4 * Net Engine and Gigabit Ethernet MAC (GMAC)
5 * This hardware contains a TCP Offload Engine (TOE) but currently the
6 * driver does not make use of it.
7 *
8 * Authors:
9 * Linus Walleij <linus.walleij@linaro.org>
10 * Tobias Waldvogel <tobias.waldvogel@gmail.com> (OpenWRT)
11 * Michał Mirosław <mirq-linux@rere.qmqm.pl>
12 * Paulius Zaleckas <paulius.zaleckas@gmail.com>
13 * Giuseppe De Robertis <Giuseppe.DeRobertis@ba.infn.it>
14 * Gary Chen & Ch Hsu Storlink Semiconductor
15 */
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/module.h>
19 #include <linux/platform_device.h>
20 #include <linux/spinlock.h>
21 #include <linux/slab.h>
22 #include <linux/dma-mapping.h>
23 #include <linux/cache.h>
24 #include <linux/interrupt.h>
25 #include <linux/reset.h>
26 #include <linux/clk.h>
27 #include <linux/of.h>
28 #include <linux/of_mdio.h>
29 #include <linux/of_net.h>
30 #include <linux/of_platform.h>
31 #include <linux/etherdevice.h>
32 #include <linux/if_vlan.h>
33 #include <linux/skbuff.h>
34 #include <linux/phy.h>
35 #include <linux/crc32.h>
36 #include <linux/ethtool.h>
37 #include <linux/tcp.h>
38 #include <linux/u64_stats_sync.h>
39
40 #include <linux/in.h>
41 #include <linux/ip.h>
42 #include <linux/ipv6.h>
43
44 #include "gemini.h"
45
46 #define DRV_NAME "gmac-gemini"
47
48 #define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK)
49 static int debug = -1;
50 module_param(debug, int, 0);
51 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
52
53 #define HSIZE_8 0x00
54 #define HSIZE_16 0x01
55 #define HSIZE_32 0x02
56
57 #define HBURST_SINGLE 0x00
58 #define HBURST_INCR 0x01
59 #define HBURST_INCR4 0x02
60 #define HBURST_INCR8 0x03
61
62 #define HPROT_DATA_CACHE BIT(0)
63 #define HPROT_PRIVILIGED BIT(1)
64 #define HPROT_BUFFERABLE BIT(2)
65 #define HPROT_CACHABLE BIT(3)
66
67 #define DEFAULT_RX_COALESCE_NSECS 0
68 #define DEFAULT_GMAC_RXQ_ORDER 9
69 #define DEFAULT_GMAC_TXQ_ORDER 8
70 #define DEFAULT_RX_BUF_ORDER 11
71 #define TX_MAX_FRAGS 16
72 #define TX_QUEUE_NUM 1 /* max: 6 */
73 #define RX_MAX_ALLOC_ORDER 2
74
75 #define GMAC0_IRQ0_2 (GMAC0_TXDERR_INT_BIT | GMAC0_TXPERR_INT_BIT | \
76 GMAC0_RXDERR_INT_BIT | GMAC0_RXPERR_INT_BIT)
77 #define GMAC0_IRQ0_TXQ0_INTS (GMAC0_SWTQ00_EOF_INT_BIT | \
78 GMAC0_SWTQ00_FIN_INT_BIT)
79 #define GMAC0_IRQ4_8 (GMAC0_MIB_INT_BIT | GMAC0_RX_OVERRUN_INT_BIT)
80
81 #define GMAC_OFFLOAD_FEATURES (NETIF_F_SG | NETIF_F_IP_CSUM | \
82 NETIF_F_IPV6_CSUM | NETIF_F_RXCSUM | \
83 NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6)
84
85 /**
86 * struct gmac_queue_page - page buffer per-page info
87 * @page: the page struct
88 * @mapping: the dma address handle
89 */
90 struct gmac_queue_page {
91 struct page *page;
92 dma_addr_t mapping;
93 };
94
95 struct gmac_txq {
96 struct gmac_txdesc *ring;
97 struct sk_buff **skb;
98 unsigned int cptr;
99 unsigned int noirq_packets;
100 };
101
102 struct gemini_ethernet;
103
104 struct gemini_ethernet_port {
105 u8 id; /* 0 or 1 */
106
107 struct gemini_ethernet *geth;
108 struct net_device *netdev;
109 struct device *dev;
110 void __iomem *dma_base;
111 void __iomem *gmac_base;
112 struct clk *pclk;
113 struct reset_control *reset;
114 int irq;
115 __le32 mac_addr[3];
116
117 void __iomem *rxq_rwptr;
118 struct gmac_rxdesc *rxq_ring;
119 unsigned int rxq_order;
120
121 struct napi_struct napi;
122 struct hrtimer rx_coalesce_timer;
123 unsigned int rx_coalesce_nsecs;
124 unsigned int freeq_refill;
125 struct gmac_txq txq[TX_QUEUE_NUM];
126 unsigned int txq_order;
127 unsigned int irq_every_tx_packets;
128
129 dma_addr_t rxq_dma_base;
130 dma_addr_t txq_dma_base;
131
132 unsigned int msg_enable;
133 spinlock_t config_lock; /* Locks config register */
134
135 struct u64_stats_sync tx_stats_syncp;
136 struct u64_stats_sync rx_stats_syncp;
137 struct u64_stats_sync ir_stats_syncp;
138
139 struct rtnl_link_stats64 stats;
140 u64 hw_stats[RX_STATS_NUM];
141 u64 rx_stats[RX_STATUS_NUM];
142 u64 rx_csum_stats[RX_CHKSUM_NUM];
143 u64 rx_napi_exits;
144 u64 tx_frag_stats[TX_MAX_FRAGS];
145 u64 tx_frags_linearized;
146 u64 tx_hw_csummed;
147 };
148
149 struct gemini_ethernet {
150 struct device *dev;
151 void __iomem *base;
152 struct gemini_ethernet_port *port0;
153 struct gemini_ethernet_port *port1;
154 bool initialized;
155
156 spinlock_t irq_lock; /* Locks IRQ-related registers */
157 unsigned int freeq_order;
158 unsigned int freeq_frag_order;
159 struct gmac_rxdesc *freeq_ring;
160 dma_addr_t freeq_dma_base;
161 struct gmac_queue_page *freeq_pages;
162 unsigned int num_freeq_pages;
163 spinlock_t freeq_lock; /* Locks queue from reentrance */
164 };
165
166 #define GMAC_STATS_NUM ( \
167 RX_STATS_NUM + RX_STATUS_NUM + RX_CHKSUM_NUM + 1 + \
168 TX_MAX_FRAGS + 2)
169
170 static const char gmac_stats_strings[GMAC_STATS_NUM][ETH_GSTRING_LEN] = {
171 "GMAC_IN_DISCARDS",
172 "GMAC_IN_ERRORS",
173 "GMAC_IN_MCAST",
174 "GMAC_IN_BCAST",
175 "GMAC_IN_MAC1",
176 "GMAC_IN_MAC2",
177 "RX_STATUS_GOOD_FRAME",
178 "RX_STATUS_TOO_LONG_GOOD_CRC",
179 "RX_STATUS_RUNT_FRAME",
180 "RX_STATUS_SFD_NOT_FOUND",
181 "RX_STATUS_CRC_ERROR",
182 "RX_STATUS_TOO_LONG_BAD_CRC",
183 "RX_STATUS_ALIGNMENT_ERROR",
184 "RX_STATUS_TOO_LONG_BAD_ALIGN",
185 "RX_STATUS_RX_ERR",
186 "RX_STATUS_DA_FILTERED",
187 "RX_STATUS_BUFFER_FULL",
188 "RX_STATUS_11",
189 "RX_STATUS_12",
190 "RX_STATUS_13",
191 "RX_STATUS_14",
192 "RX_STATUS_15",
193 "RX_CHKSUM_IP_UDP_TCP_OK",
194 "RX_CHKSUM_IP_OK_ONLY",
195 "RX_CHKSUM_NONE",
196 "RX_CHKSUM_3",
197 "RX_CHKSUM_IP_ERR_UNKNOWN",
198 "RX_CHKSUM_IP_ERR",
199 "RX_CHKSUM_TCP_UDP_ERR",
200 "RX_CHKSUM_7",
201 "RX_NAPI_EXITS",
202 "TX_FRAGS[1]",
203 "TX_FRAGS[2]",
204 "TX_FRAGS[3]",
205 "TX_FRAGS[4]",
206 "TX_FRAGS[5]",
207 "TX_FRAGS[6]",
208 "TX_FRAGS[7]",
209 "TX_FRAGS[8]",
210 "TX_FRAGS[9]",
211 "TX_FRAGS[10]",
212 "TX_FRAGS[11]",
213 "TX_FRAGS[12]",
214 "TX_FRAGS[13]",
215 "TX_FRAGS[14]",
216 "TX_FRAGS[15]",
217 "TX_FRAGS[16+]",
218 "TX_FRAGS_LINEARIZED",
219 "TX_HW_CSUMMED",
220 };
221
222 static void gmac_dump_dma_state(struct net_device *netdev);
223
224 static void gmac_update_config0_reg(struct net_device *netdev,
225 u32 val, u32 vmask)
226 {
227 struct gemini_ethernet_port *port = netdev_priv(netdev);
228 unsigned long flags;
229 u32 reg;
230
231 spin_lock_irqsave(&port->config_lock, flags);
232
233 reg = readl(port->gmac_base + GMAC_CONFIG0);
234 reg = (reg & ~vmask) | val;
235 writel(reg, port->gmac_base + GMAC_CONFIG0);
236
237 spin_unlock_irqrestore(&port->config_lock, flags);
238 }
239
240 static void gmac_enable_tx_rx(struct net_device *netdev)
241 {
242 struct gemini_ethernet_port *port = netdev_priv(netdev);
243 unsigned long flags;
244 u32 reg;
245
246 spin_lock_irqsave(&port->config_lock, flags);
247
248 reg = readl(port->gmac_base + GMAC_CONFIG0);
249 reg &= ~CONFIG0_TX_RX_DISABLE;
250 writel(reg, port->gmac_base + GMAC_CONFIG0);
251
252 spin_unlock_irqrestore(&port->config_lock, flags);
253 }
254
255 static void gmac_disable_tx_rx(struct net_device *netdev)
256 {
257 struct gemini_ethernet_port *port = netdev_priv(netdev);
258 unsigned long flags;
259 u32 val;
260
261 spin_lock_irqsave(&port->config_lock, flags);
262
263 val = readl(port->gmac_base + GMAC_CONFIG0);
264 val |= CONFIG0_TX_RX_DISABLE;
265 writel(val, port->gmac_base + GMAC_CONFIG0);
266
267 spin_unlock_irqrestore(&port->config_lock, flags);
268
269 mdelay(10); /* let GMAC consume packet */
270 }
271
272 static void gmac_set_flow_control(struct net_device *netdev, bool tx, bool rx)
273 {
274 struct gemini_ethernet_port *port = netdev_priv(netdev);
275 unsigned long flags;
276 u32 val;
277
278 spin_lock_irqsave(&port->config_lock, flags);
279
280 val = readl(port->gmac_base + GMAC_CONFIG0);
281 val &= ~CONFIG0_FLOW_CTL;
282 if (tx)
283 val |= CONFIG0_FLOW_TX;
284 if (rx)
285 val |= CONFIG0_FLOW_RX;
286 writel(val, port->gmac_base + GMAC_CONFIG0);
287
288 spin_unlock_irqrestore(&port->config_lock, flags);
289 }
290
291 static void gmac_adjust_link(struct net_device *netdev)
292 {
293 struct gemini_ethernet_port *port = netdev_priv(netdev);
294 struct phy_device *phydev = netdev->phydev;
295 union gmac_status status, old_status;
296 bool pause_tx = false;
297 bool pause_rx = false;
298
299 status.bits32 = readl(port->gmac_base + GMAC_STATUS);
300 old_status.bits32 = status.bits32;
301 status.bits.link = phydev->link;
302 status.bits.duplex = phydev->duplex;
303
304 switch (phydev->speed) {
305 case 1000:
306 status.bits.speed = GMAC_SPEED_1000;
307 if (phy_interface_mode_is_rgmii(phydev->interface))
308 status.bits.mii_rmii = GMAC_PHY_RGMII_1000;
309 netdev_dbg(netdev, "connect %s to RGMII @ 1Gbit\n",
310 phydev_name(phydev));
311 break;
312 case 100:
313 status.bits.speed = GMAC_SPEED_100;
314 if (phy_interface_mode_is_rgmii(phydev->interface))
315 status.bits.mii_rmii = GMAC_PHY_RGMII_100_10;
316 netdev_dbg(netdev, "connect %s to RGMII @ 100 Mbit\n",
317 phydev_name(phydev));
318 break;
319 case 10:
320 status.bits.speed = GMAC_SPEED_10;
321 if (phy_interface_mode_is_rgmii(phydev->interface))
322 status.bits.mii_rmii = GMAC_PHY_RGMII_100_10;
323 netdev_dbg(netdev, "connect %s to RGMII @ 10 Mbit\n",
324 phydev_name(phydev));
325 break;
326 default:
327 netdev_warn(netdev, "Unsupported PHY speed (%d) on %s\n",
328 phydev->speed, phydev_name(phydev));
329 }
330
331 if (phydev->duplex == DUPLEX_FULL) {
332 phy_get_pause(phydev, &pause_tx, &pause_rx);
333 netdev_dbg(netdev, "set negotiated pause params pause TX = %s, pause RX = %s\n",
334 pause_tx ? "ON" : "OFF", pause_rx ? "ON" : "OFF");
335 }
336
337 gmac_set_flow_control(netdev, pause_tx, pause_rx);
338
339 if (old_status.bits32 == status.bits32)
340 return;
341
342 if (netif_msg_link(port)) {
343 phy_print_status(phydev);
344 netdev_info(netdev, "link flow control: %s\n",
345 phydev->pause
346 ? (phydev->asym_pause ? "tx" : "both")
347 : (phydev->asym_pause ? "rx" : "none")
348 );
349 }
350
351 gmac_disable_tx_rx(netdev);
352 writel(status.bits32, port->gmac_base + GMAC_STATUS);
353 gmac_enable_tx_rx(netdev);
354 }
355
356 static int gmac_setup_phy(struct net_device *netdev)
357 {
358 struct gemini_ethernet_port *port = netdev_priv(netdev);
359 union gmac_status status = { .bits32 = 0 };
360 struct device *dev = port->dev;
361 struct phy_device *phy;
362
363 phy = of_phy_get_and_connect(netdev,
364 dev->of_node,
365 gmac_adjust_link);
366 if (!phy)
367 return -ENODEV;
368 netdev->phydev = phy;
369
370 phy_set_max_speed(phy, SPEED_1000);
371 phy_support_asym_pause(phy);
372
373 /* set PHY interface type */
374 switch (phy->interface) {
375 case PHY_INTERFACE_MODE_MII:
376 netdev_dbg(netdev,
377 "MII: set GMAC0 to GMII mode, GMAC1 disabled\n");
378 status.bits.mii_rmii = GMAC_PHY_MII;
379 break;
380 case PHY_INTERFACE_MODE_GMII:
381 netdev_dbg(netdev,
382 "GMII: set GMAC0 to GMII mode, GMAC1 disabled\n");
383 status.bits.mii_rmii = GMAC_PHY_GMII;
384 break;
385 case PHY_INTERFACE_MODE_RGMII:
386 case PHY_INTERFACE_MODE_RGMII_ID:
387 case PHY_INTERFACE_MODE_RGMII_TXID:
388 case PHY_INTERFACE_MODE_RGMII_RXID:
389 netdev_dbg(netdev,
390 "RGMII: set GMAC0 and GMAC1 to MII/RGMII mode\n");
391 status.bits.mii_rmii = GMAC_PHY_RGMII_100_10;
392 break;
393 default:
394 netdev_err(netdev, "Unsupported MII interface\n");
395 phy_disconnect(phy);
396 netdev->phydev = NULL;
397 return -EINVAL;
398 }
399 writel(status.bits32, port->gmac_base + GMAC_STATUS);
400
401 if (netif_msg_link(port))
402 phy_attached_info(phy);
403
404 return 0;
405 }
406
407 /* The maximum frame length is not logically enumerated in the
408 * hardware, so we do a table lookup to find the applicable max
409 * frame length.
410 */
411 struct gmac_max_framelen {
412 unsigned int max_l3_len;
413 u8 val;
414 };
415
416 static const struct gmac_max_framelen gmac_maxlens[] = {
417 {
418 .max_l3_len = 1518,
419 .val = CONFIG0_MAXLEN_1518,
420 },
421 {
422 .max_l3_len = 1522,
423 .val = CONFIG0_MAXLEN_1522,
424 },
425 {
426 .max_l3_len = 1536,
427 .val = CONFIG0_MAXLEN_1536,
428 },
429 {
430 .max_l3_len = 1548,
431 .val = CONFIG0_MAXLEN_1548,
432 },
433 {
434 .max_l3_len = 9212,
435 .val = CONFIG0_MAXLEN_9k,
436 },
437 {
438 .max_l3_len = 10236,
439 .val = CONFIG0_MAXLEN_10k,
440 },
441 };
442
443 static int gmac_pick_rx_max_len(unsigned int max_l3_len)
444 {
445 const struct gmac_max_framelen *maxlen;
446 int maxtot;
447 int i;
448
449 maxtot = max_l3_len + ETH_HLEN + VLAN_HLEN;
450
451 for (i = 0; i < ARRAY_SIZE(gmac_maxlens); i++) {
452 maxlen = &gmac_maxlens[i];
453 if (maxtot <= maxlen->max_l3_len)
454 return maxlen->val;
455 }
456
457 return -1;
458 }
459
460 static int gmac_init(struct net_device *netdev)
461 {
462 struct gemini_ethernet_port *port = netdev_priv(netdev);
463 union gmac_config0 config0 = { .bits = {
464 .dis_tx = 1,
465 .dis_rx = 1,
466 .ipv4_rx_chksum = 1,
467 .ipv6_rx_chksum = 1,
468 .rx_err_detect = 1,
469 .rgmm_edge = 1,
470 .port0_chk_hwq = 1,
471 .port1_chk_hwq = 1,
472 .port0_chk_toeq = 1,
473 .port1_chk_toeq = 1,
474 .port0_chk_classq = 1,
475 .port1_chk_classq = 1,
476 } };
477 union gmac_ahb_weight ahb_weight = { .bits = {
478 .rx_weight = 1,
479 .tx_weight = 1,
480 .hash_weight = 1,
481 .pre_req = 0x1f,
482 .tq_dv_threshold = 0,
483 } };
484 union gmac_tx_wcr0 hw_weigh = { .bits = {
485 .hw_tq3 = 1,
486 .hw_tq2 = 1,
487 .hw_tq1 = 1,
488 .hw_tq0 = 1,
489 } };
490 union gmac_tx_wcr1 sw_weigh = { .bits = {
491 .sw_tq5 = 1,
492 .sw_tq4 = 1,
493 .sw_tq3 = 1,
494 .sw_tq2 = 1,
495 .sw_tq1 = 1,
496 .sw_tq0 = 1,
497 } };
498 union gmac_config1 config1 = { .bits = {
499 .set_threshold = 16,
500 .rel_threshold = 24,
501 } };
502 union gmac_config2 config2 = { .bits = {
503 .set_threshold = 16,
504 .rel_threshold = 32,
505 } };
506 union gmac_config3 config3 = { .bits = {
507 .set_threshold = 0,
508 .rel_threshold = 0,
509 } };
510 union gmac_config0 tmp;
511
512 config0.bits.max_len = gmac_pick_rx_max_len(netdev->mtu);
513 tmp.bits32 = readl(port->gmac_base + GMAC_CONFIG0);
514 config0.bits.reserved = tmp.bits.reserved;
515 writel(config0.bits32, port->gmac_base + GMAC_CONFIG0);
516 writel(config1.bits32, port->gmac_base + GMAC_CONFIG1);
517 writel(config2.bits32, port->gmac_base + GMAC_CONFIG2);
518 writel(config3.bits32, port->gmac_base + GMAC_CONFIG3);
519
520 readl(port->dma_base + GMAC_AHB_WEIGHT_REG);
521 writel(ahb_weight.bits32, port->dma_base + GMAC_AHB_WEIGHT_REG);
522
523 writel(hw_weigh.bits32,
524 port->dma_base + GMAC_TX_WEIGHTING_CTRL_0_REG);
525 writel(sw_weigh.bits32,
526 port->dma_base + GMAC_TX_WEIGHTING_CTRL_1_REG);
527
528 port->rxq_order = DEFAULT_GMAC_RXQ_ORDER;
529 port->txq_order = DEFAULT_GMAC_TXQ_ORDER;
530 port->rx_coalesce_nsecs = DEFAULT_RX_COALESCE_NSECS;
531
532 /* Mark every quarter of the queue a packet for interrupt
533 * in order to be able to wake up the queue if it was stopped
534 */
535 port->irq_every_tx_packets = 1 << (port->txq_order - 2);
536
537 return 0;
538 }
539
540 static int gmac_setup_txqs(struct net_device *netdev)
541 {
542 struct gemini_ethernet_port *port = netdev_priv(netdev);
543 unsigned int n_txq = netdev->num_tx_queues;
544 struct gemini_ethernet *geth = port->geth;
545 size_t entries = 1 << port->txq_order;
546 struct gmac_txq *txq = port->txq;
547 struct gmac_txdesc *desc_ring;
548 size_t len = n_txq * entries;
549 struct sk_buff **skb_tab;
550 void __iomem *rwptr_reg;
551 unsigned int r;
552 int i;
553
554 rwptr_reg = port->dma_base + GMAC_SW_TX_QUEUE0_PTR_REG;
555
556 skb_tab = kcalloc(len, sizeof(*skb_tab), GFP_KERNEL);
557 if (!skb_tab)
558 return -ENOMEM;
559
560 desc_ring = dma_alloc_coherent(geth->dev, len * sizeof(*desc_ring),
561 &port->txq_dma_base, GFP_KERNEL);
562
563 if (!desc_ring) {
564 kfree(skb_tab);
565 return -ENOMEM;
566 }
567
568 if (port->txq_dma_base & ~DMA_Q_BASE_MASK) {
569 dev_warn(geth->dev, "TX queue base is not aligned\n");
570 dma_free_coherent(geth->dev, len * sizeof(*desc_ring),
571 desc_ring, port->txq_dma_base);
572 kfree(skb_tab);
573 return -ENOMEM;
574 }
575
576 writel(port->txq_dma_base | port->txq_order,
577 port->dma_base + GMAC_SW_TX_QUEUE_BASE_REG);
578
579 for (i = 0; i < n_txq; i++) {
580 txq->ring = desc_ring;
581 txq->skb = skb_tab;
582 txq->noirq_packets = 0;
583
584 r = readw(rwptr_reg);
585 rwptr_reg += 2;
586 writew(r, rwptr_reg);
587 rwptr_reg += 2;
588 txq->cptr = r;
589
590 txq++;
591 desc_ring += entries;
592 skb_tab += entries;
593 }
594
595 return 0;
596 }
597
598 static void gmac_clean_txq(struct net_device *netdev, struct gmac_txq *txq,
599 unsigned int r)
600 {
601 struct gemini_ethernet_port *port = netdev_priv(netdev);
602 unsigned int m = (1 << port->txq_order) - 1;
603 struct gemini_ethernet *geth = port->geth;
604 unsigned int c = txq->cptr;
605 union gmac_txdesc_0 word0;
606 union gmac_txdesc_1 word1;
607 unsigned int hwchksum = 0;
608 unsigned long bytes = 0;
609 struct gmac_txdesc *txd;
610 unsigned short nfrags;
611 unsigned int errs = 0;
612 unsigned int pkts = 0;
613 unsigned int word3;
614 dma_addr_t mapping;
615
616 if (c == r)
617 return;
618
619 while (c != r) {
620 txd = txq->ring + c;
621 word0 = txd->word0;
622 word1 = txd->word1;
623 mapping = txd->word2.buf_adr;
624 word3 = txd->word3.bits32;
625
626 dma_unmap_single(geth->dev, mapping,
627 word0.bits.buffer_size, DMA_TO_DEVICE);
628
629 if (word3 & EOF_BIT)
630 dev_kfree_skb(txq->skb[c]);
631
632 c++;
633 c &= m;
634
635 if (!(word3 & SOF_BIT))
636 continue;
637
638 if (!word0.bits.status_tx_ok) {
639 errs++;
640 continue;
641 }
642
643 pkts++;
644 bytes += txd->word1.bits.byte_count;
645
646 if (word1.bits32 & TSS_CHECKUM_ENABLE)
647 hwchksum++;
648
649 nfrags = word0.bits.desc_count - 1;
650 if (nfrags) {
651 if (nfrags >= TX_MAX_FRAGS)
652 nfrags = TX_MAX_FRAGS - 1;
653
654 u64_stats_update_begin(&port->tx_stats_syncp);
655 port->tx_frag_stats[nfrags]++;
656 u64_stats_update_end(&port->tx_stats_syncp);
657 }
658 }
659
660 u64_stats_update_begin(&port->ir_stats_syncp);
661 port->stats.tx_errors += errs;
662 port->stats.tx_packets += pkts;
663 port->stats.tx_bytes += bytes;
664 port->tx_hw_csummed += hwchksum;
665 u64_stats_update_end(&port->ir_stats_syncp);
666
667 txq->cptr = c;
668 }
669
670 static void gmac_cleanup_txqs(struct net_device *netdev)
671 {
672 struct gemini_ethernet_port *port = netdev_priv(netdev);
673 unsigned int n_txq = netdev->num_tx_queues;
674 struct gemini_ethernet *geth = port->geth;
675 void __iomem *rwptr_reg;
676 unsigned int r, i;
677
678 rwptr_reg = port->dma_base + GMAC_SW_TX_QUEUE0_PTR_REG;
679
680 for (i = 0; i < n_txq; i++) {
681 r = readw(rwptr_reg);
682 rwptr_reg += 2;
683 writew(r, rwptr_reg);
684 rwptr_reg += 2;
685
686 gmac_clean_txq(netdev, port->txq + i, r);
687 }
688 writel(0, port->dma_base + GMAC_SW_TX_QUEUE_BASE_REG);
689
690 kfree(port->txq->skb);
691 dma_free_coherent(geth->dev,
692 n_txq * sizeof(*port->txq->ring) << port->txq_order,
693 port->txq->ring, port->txq_dma_base);
694 }
695
696 static int gmac_setup_rxq(struct net_device *netdev)
697 {
698 struct gemini_ethernet_port *port = netdev_priv(netdev);
699 struct gemini_ethernet *geth = port->geth;
700 struct nontoe_qhdr __iomem *qhdr;
701
702 qhdr = geth->base + TOE_DEFAULT_Q_HDR_BASE(netdev->dev_id);
703 port->rxq_rwptr = &qhdr->word1;
704
705 /* Remap a slew of memory to use for the RX queue */
706 port->rxq_ring = dma_alloc_coherent(geth->dev,
707 sizeof(*port->rxq_ring) << port->rxq_order,
708 &port->rxq_dma_base, GFP_KERNEL);
709 if (!port->rxq_ring)
710 return -ENOMEM;
711 if (port->rxq_dma_base & ~NONTOE_QHDR0_BASE_MASK) {
712 dev_warn(geth->dev, "RX queue base is not aligned\n");
713 return -ENOMEM;
714 }
715
716 writel(port->rxq_dma_base | port->rxq_order, &qhdr->word0);
717 writel(0, port->rxq_rwptr);
718 return 0;
719 }
720
721 static struct gmac_queue_page *
722 gmac_get_queue_page(struct gemini_ethernet *geth,
723 struct gemini_ethernet_port *port,
724 dma_addr_t addr)
725 {
726 struct gmac_queue_page *gpage;
727 dma_addr_t mapping;
728 int i;
729
730 /* Only look for even pages */
731 mapping = addr & PAGE_MASK;
732
733 if (!geth->freeq_pages) {
734 dev_err(geth->dev, "try to get page with no page list\n");
735 return NULL;
736 }
737
738 /* Look up a ring buffer page from virtual mapping */
739 for (i = 0; i < geth->num_freeq_pages; i++) {
740 gpage = &geth->freeq_pages[i];
741 if (gpage->mapping == mapping)
742 return gpage;
743 }
744
745 return NULL;
746 }
747
748 static void gmac_cleanup_rxq(struct net_device *netdev)
749 {
750 struct gemini_ethernet_port *port = netdev_priv(netdev);
751 struct gemini_ethernet *geth = port->geth;
752 struct gmac_rxdesc *rxd = port->rxq_ring;
753 static struct gmac_queue_page *gpage;
754 struct nontoe_qhdr __iomem *qhdr;
755 void __iomem *dma_reg;
756 void __iomem *ptr_reg;
757 dma_addr_t mapping;
758 union dma_rwptr rw;
759 unsigned int r, w;
760
761 qhdr = geth->base +
762 TOE_DEFAULT_Q_HDR_BASE(netdev->dev_id);
763 dma_reg = &qhdr->word0;
764 ptr_reg = &qhdr->word1;
765
766 rw.bits32 = readl(ptr_reg);
767 r = rw.bits.rptr;
768 w = rw.bits.wptr;
769 writew(r, ptr_reg + 2);
770
771 writel(0, dma_reg);
772
773 /* Loop from read pointer to write pointer of the RX queue
774 * and free up all pages by the queue.
775 */
776 while (r != w) {
777 mapping = rxd[r].word2.buf_adr;
778 r++;
779 r &= ((1 << port->rxq_order) - 1);
780
781 if (!mapping)
782 continue;
783
784 /* Freeq pointers are one page off */
785 gpage = gmac_get_queue_page(geth, port, mapping + PAGE_SIZE);
786 if (!gpage) {
787 dev_err(geth->dev, "could not find page\n");
788 continue;
789 }
790 /* Release the RX queue reference to the page */
791 put_page(gpage->page);
792 }
793
794 dma_free_coherent(geth->dev, sizeof(*port->rxq_ring) << port->rxq_order,
795 port->rxq_ring, port->rxq_dma_base);
796 }
797
798 static struct page *geth_freeq_alloc_map_page(struct gemini_ethernet *geth,
799 int pn)
800 {
801 struct gmac_rxdesc *freeq_entry;
802 struct gmac_queue_page *gpage;
803 unsigned int fpp_order;
804 unsigned int frag_len;
805 dma_addr_t mapping;
806 struct page *page;
807 int i;
808
809 /* First allocate and DMA map a single page */
810 page = alloc_page(GFP_ATOMIC);
811 if (!page)
812 return NULL;
813
814 mapping = dma_map_single(geth->dev, page_address(page),
815 PAGE_SIZE, DMA_FROM_DEVICE);
816 if (dma_mapping_error(geth->dev, mapping)) {
817 put_page(page);
818 return NULL;
819 }
820
821 /* The assign the page mapping (physical address) to the buffer address
822 * in the hardware queue. PAGE_SHIFT on ARM is 12 (1 page is 4096 bytes,
823 * 4k), and the default RX frag order is 11 (fragments are up 20 2048
824 * bytes, 2k) so fpp_order (fragments per page order) is default 1. Thus
825 * each page normally needs two entries in the queue.
826 */
827 frag_len = 1 << geth->freeq_frag_order; /* Usually 2048 */
828 fpp_order = PAGE_SHIFT - geth->freeq_frag_order;
829 freeq_entry = geth->freeq_ring + (pn << fpp_order);
830 dev_dbg(geth->dev, "allocate page %d fragment length %d fragments per page %d, freeq entry %p\n",
831 pn, frag_len, (1 << fpp_order), freeq_entry);
832 for (i = (1 << fpp_order); i > 0; i--) {
833 freeq_entry->word2.buf_adr = mapping;
834 freeq_entry++;
835 mapping += frag_len;
836 }
837
838 /* If the freeq entry already has a page mapped, then unmap it. */
839 gpage = &geth->freeq_pages[pn];
840 if (gpage->page) {
841 mapping = geth->freeq_ring[pn << fpp_order].word2.buf_adr;
842 dma_unmap_single(geth->dev, mapping, frag_len, DMA_FROM_DEVICE);
843 /* This should be the last reference to the page so it gets
844 * released
845 */
846 put_page(gpage->page);
847 }
848
849 /* Then put our new mapping into the page table */
850 dev_dbg(geth->dev, "page %d, DMA addr: %08x, page %p\n",
851 pn, (unsigned int)mapping, page);
852 gpage->mapping = mapping;
853 gpage->page = page;
854
855 return page;
856 }
857
858 /**
859 * geth_fill_freeq() - Fill the freeq with empty fragments to use
860 * @geth: the ethernet adapter
861 * @refill: whether to reset the queue by filling in all freeq entries or
862 * just refill it, usually the interrupt to refill the queue happens when
863 * the queue is half empty.
864 */
865 static unsigned int geth_fill_freeq(struct gemini_ethernet *geth, bool refill)
866 {
867 unsigned int fpp_order = PAGE_SHIFT - geth->freeq_frag_order;
868 unsigned int count = 0;
869 unsigned int pn, epn;
870 unsigned long flags;
871 union dma_rwptr rw;
872 unsigned int m_pn;
873
874 /* Mask for page */
875 m_pn = (1 << (geth->freeq_order - fpp_order)) - 1;
876
877 spin_lock_irqsave(&geth->freeq_lock, flags);
878
879 rw.bits32 = readl(geth->base + GLOBAL_SWFQ_RWPTR_REG);
880 pn = (refill ? rw.bits.wptr : rw.bits.rptr) >> fpp_order;
881 epn = (rw.bits.rptr >> fpp_order) - 1;
882 epn &= m_pn;
883
884 /* Loop over the freeq ring buffer entries */
885 while (pn != epn) {
886 struct gmac_queue_page *gpage;
887 struct page *page;
888
889 gpage = &geth->freeq_pages[pn];
890 page = gpage->page;
891
892 dev_dbg(geth->dev, "fill entry %d page ref count %d add %d refs\n",
893 pn, page_ref_count(page), 1 << fpp_order);
894
895 if (page_ref_count(page) > 1) {
896 unsigned int fl = (pn - epn) & m_pn;
897
898 if (fl > 64 >> fpp_order)
899 break;
900
901 page = geth_freeq_alloc_map_page(geth, pn);
902 if (!page)
903 break;
904 }
905
906 /* Add one reference per fragment in the page */
907 page_ref_add(page, 1 << fpp_order);
908 count += 1 << fpp_order;
909 pn++;
910 pn &= m_pn;
911 }
912
913 writew(pn << fpp_order, geth->base + GLOBAL_SWFQ_RWPTR_REG + 2);
914
915 spin_unlock_irqrestore(&geth->freeq_lock, flags);
916
917 return count;
918 }
919
920 static int geth_setup_freeq(struct gemini_ethernet *geth)
921 {
922 unsigned int fpp_order = PAGE_SHIFT - geth->freeq_frag_order;
923 unsigned int frag_len = 1 << geth->freeq_frag_order;
924 unsigned int len = 1 << geth->freeq_order;
925 unsigned int pages = len >> fpp_order;
926 union queue_threshold qt;
927 union dma_skb_size skbsz;
928 unsigned int filled;
929 unsigned int pn;
930
931 geth->freeq_ring = dma_alloc_coherent(geth->dev,
932 sizeof(*geth->freeq_ring) << geth->freeq_order,
933 &geth->freeq_dma_base, GFP_KERNEL);
934 if (!geth->freeq_ring)
935 return -ENOMEM;
936 if (geth->freeq_dma_base & ~DMA_Q_BASE_MASK) {
937 dev_warn(geth->dev, "queue ring base is not aligned\n");
938 goto err_freeq;
939 }
940
941 /* Allocate a mapping to page look-up index */
942 geth->freeq_pages = kcalloc(pages, sizeof(*geth->freeq_pages),
943 GFP_KERNEL);
944 if (!geth->freeq_pages)
945 goto err_freeq;
946 geth->num_freeq_pages = pages;
947
948 dev_info(geth->dev, "allocate %d pages for queue\n", pages);
949 for (pn = 0; pn < pages; pn++)
950 if (!geth_freeq_alloc_map_page(geth, pn))
951 goto err_freeq_alloc;
952
953 filled = geth_fill_freeq(geth, false);
954 if (!filled)
955 goto err_freeq_alloc;
956
957 qt.bits32 = readl(geth->base + GLOBAL_QUEUE_THRESHOLD_REG);
958 qt.bits.swfq_empty = 32;
959 writel(qt.bits32, geth->base + GLOBAL_QUEUE_THRESHOLD_REG);
960
961 skbsz.bits.sw_skb_size = 1 << geth->freeq_frag_order;
962 writel(skbsz.bits32, geth->base + GLOBAL_DMA_SKB_SIZE_REG);
963 writel(geth->freeq_dma_base | geth->freeq_order,
964 geth->base + GLOBAL_SW_FREEQ_BASE_SIZE_REG);
965
966 return 0;
967
968 err_freeq_alloc:
969 while (pn > 0) {
970 struct gmac_queue_page *gpage;
971 dma_addr_t mapping;
972
973 --pn;
974 mapping = geth->freeq_ring[pn << fpp_order].word2.buf_adr;
975 dma_unmap_single(geth->dev, mapping, frag_len, DMA_FROM_DEVICE);
976 gpage = &geth->freeq_pages[pn];
977 put_page(gpage->page);
978 }
979
980 kfree(geth->freeq_pages);
981 err_freeq:
982 dma_free_coherent(geth->dev,
983 sizeof(*geth->freeq_ring) << geth->freeq_order,
984 geth->freeq_ring, geth->freeq_dma_base);
985 geth->freeq_ring = NULL;
986 return -ENOMEM;
987 }
988
989 /**
990 * geth_cleanup_freeq() - cleanup the DMA mappings and free the queue
991 * @geth: the Gemini global ethernet state
992 */
993 static void geth_cleanup_freeq(struct gemini_ethernet *geth)
994 {
995 unsigned int fpp_order = PAGE_SHIFT - geth->freeq_frag_order;
996 unsigned int frag_len = 1 << geth->freeq_frag_order;
997 unsigned int len = 1 << geth->freeq_order;
998 unsigned int pages = len >> fpp_order;
999 unsigned int pn;
1000
1001 writew(readw(geth->base + GLOBAL_SWFQ_RWPTR_REG),
1002 geth->base + GLOBAL_SWFQ_RWPTR_REG + 2);
1003 writel(0, geth->base + GLOBAL_SW_FREEQ_BASE_SIZE_REG);
1004
1005 for (pn = 0; pn < pages; pn++) {
1006 struct gmac_queue_page *gpage;
1007 dma_addr_t mapping;
1008
1009 mapping = geth->freeq_ring[pn << fpp_order].word2.buf_adr;
1010 dma_unmap_single(geth->dev, mapping, frag_len, DMA_FROM_DEVICE);
1011
1012 gpage = &geth->freeq_pages[pn];
1013 while (page_ref_count(gpage->page) > 0)
1014 put_page(gpage->page);
1015 }
1016
1017 kfree(geth->freeq_pages);
1018
1019 dma_free_coherent(geth->dev,
1020 sizeof(*geth->freeq_ring) << geth->freeq_order,
1021 geth->freeq_ring, geth->freeq_dma_base);
1022 }
1023
1024 /**
1025 * geth_resize_freeq() - resize the software queue depth
1026 * @port: the port requesting the change
1027 *
1028 * This gets called at least once during probe() so the device queue gets
1029 * "resized" from the hardware defaults. Since both ports/net devices share
1030 * the same hardware queue, some synchronization between the ports is
1031 * needed.
1032 */
1033 static int geth_resize_freeq(struct gemini_ethernet_port *port)
1034 {
1035 struct gemini_ethernet *geth = port->geth;
1036 struct net_device *netdev = port->netdev;
1037 struct gemini_ethernet_port *other_port;
1038 struct net_device *other_netdev;
1039 unsigned int new_size = 0;
1040 unsigned int new_order;
1041 unsigned long flags;
1042 u32 en;
1043 int ret;
1044
1045 if (netdev->dev_id == 0)
1046 other_netdev = geth->port1->netdev;
1047 else
1048 other_netdev = geth->port0->netdev;
1049
1050 if (other_netdev && netif_running(other_netdev))
1051 return -EBUSY;
1052
1053 new_size = 1 << (port->rxq_order + 1);
1054 netdev_dbg(netdev, "port %d size: %d order %d\n",
1055 netdev->dev_id,
1056 new_size,
1057 port->rxq_order);
1058 if (other_netdev) {
1059 other_port = netdev_priv(other_netdev);
1060 new_size += 1 << (other_port->rxq_order + 1);
1061 netdev_dbg(other_netdev, "port %d size: %d order %d\n",
1062 other_netdev->dev_id,
1063 (1 << (other_port->rxq_order + 1)),
1064 other_port->rxq_order);
1065 }
1066
1067 new_order = min(15, ilog2(new_size - 1) + 1);
1068 dev_dbg(geth->dev, "set shared queue to size %d order %d\n",
1069 new_size, new_order);
1070 if (geth->freeq_order == new_order)
1071 return 0;
1072
1073 spin_lock_irqsave(&geth->irq_lock, flags);
1074
1075 /* Disable the software queue IRQs */
1076 en = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
1077 en &= ~SWFQ_EMPTY_INT_BIT;
1078 writel(en, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
1079 spin_unlock_irqrestore(&geth->irq_lock, flags);
1080
1081 /* Drop the old queue */
1082 if (geth->freeq_ring)
1083 geth_cleanup_freeq(geth);
1084
1085 /* Allocate a new queue with the desired order */
1086 geth->freeq_order = new_order;
1087 ret = geth_setup_freeq(geth);
1088
1089 /* Restart the interrupts - NOTE if this is the first resize
1090 * after probe(), this is where the interrupts get turned on
1091 * in the first place.
1092 */
1093 spin_lock_irqsave(&geth->irq_lock, flags);
1094 en |= SWFQ_EMPTY_INT_BIT;
1095 writel(en, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
1096 spin_unlock_irqrestore(&geth->irq_lock, flags);
1097
1098 return ret;
1099 }
1100
1101 static void gmac_tx_irq_enable(struct net_device *netdev,
1102 unsigned int txq, int en)
1103 {
1104 struct gemini_ethernet_port *port = netdev_priv(netdev);
1105 struct gemini_ethernet *geth = port->geth;
1106 unsigned long flags;
1107 u32 val, mask;
1108
1109 netdev_dbg(netdev, "%s device %d\n", __func__, netdev->dev_id);
1110
1111 spin_lock_irqsave(&geth->irq_lock, flags);
1112
1113 mask = GMAC0_IRQ0_TXQ0_INTS << (6 * netdev->dev_id + txq);
1114
1115 if (en)
1116 writel(mask, geth->base + GLOBAL_INTERRUPT_STATUS_0_REG);
1117
1118 val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
1119 val = en ? val | mask : val & ~mask;
1120 writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
1121
1122 spin_unlock_irqrestore(&geth->irq_lock, flags);
1123 }
1124
1125 static void gmac_tx_irq(struct net_device *netdev, unsigned int txq_num)
1126 {
1127 struct netdev_queue *ntxq = netdev_get_tx_queue(netdev, txq_num);
1128
1129 gmac_tx_irq_enable(netdev, txq_num, 0);
1130 netif_tx_wake_queue(ntxq);
1131 }
1132
1133 static int gmac_map_tx_bufs(struct net_device *netdev, struct sk_buff *skb,
1134 struct gmac_txq *txq, unsigned short *desc)
1135 {
1136 struct gemini_ethernet_port *port = netdev_priv(netdev);
1137 struct skb_shared_info *skb_si = skb_shinfo(skb);
1138 unsigned short m = (1 << port->txq_order) - 1;
1139 short frag, last_frag = skb_si->nr_frags - 1;
1140 struct gemini_ethernet *geth = port->geth;
1141 unsigned int word1, word3, buflen;
1142 unsigned short w = *desc;
1143 struct gmac_txdesc *txd;
1144 skb_frag_t *skb_frag;
1145 dma_addr_t mapping;
1146 void *buffer;
1147 u16 mss;
1148 int ret;
1149
1150 word1 = skb->len;
1151 word3 = SOF_BIT;
1152
1153 mss = skb_shinfo(skb)->gso_size;
1154 if (mss) {
1155 /* This means we are dealing with TCP and skb->len is the
1156 * sum total of all the segments. The TSO will deal with
1157 * chopping this up for us.
1158 */
1159 /* The accelerator needs the full frame size here */
1160 mss += skb_tcp_all_headers(skb);
1161 netdev_dbg(netdev, "segment offloading mss = %04x len=%04x\n",
1162 mss, skb->len);
1163 word1 |= TSS_MTU_ENABLE_BIT;
1164 word3 |= mss;
1165 } else if (skb->len >= ETH_FRAME_LEN) {
1166 /* Hardware offloaded checksumming isn't working on frames
1167 * bigger than 1514 bytes. A hypothesis about this is that the
1168 * checksum buffer is only 1518 bytes, so when the frames get
1169 * bigger they get truncated, or the last few bytes get
1170 * overwritten by the FCS.
1171 *
1172 * Just use software checksumming and bypass on bigger frames.
1173 */
1174 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1175 ret = skb_checksum_help(skb);
1176 if (ret)
1177 return ret;
1178 }
1179 word1 |= TSS_BYPASS_BIT;
1180 }
1181
1182 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1183 int tcp = 0;
1184
1185 /* We do not switch off the checksumming on non TCP/UDP
1186 * frames: as is shown from tests, the checksumming engine
1187 * is smart enough to see that a frame is not actually TCP
1188 * or UDP and then just pass it through without any changes
1189 * to the frame.
1190 */
1191 if (skb->protocol == htons(ETH_P_IP)) {
1192 word1 |= TSS_IP_CHKSUM_BIT;
1193 tcp = ip_hdr(skb)->protocol == IPPROTO_TCP;
1194 } else { /* IPv6 */
1195 word1 |= TSS_IPV6_ENABLE_BIT;
1196 tcp = ipv6_hdr(skb)->nexthdr == IPPROTO_TCP;
1197 }
1198
1199 word1 |= tcp ? TSS_TCP_CHKSUM_BIT : TSS_UDP_CHKSUM_BIT;
1200 }
1201
1202 frag = -1;
1203 while (frag <= last_frag) {
1204 if (frag == -1) {
1205 buffer = skb->data;
1206 buflen = skb_headlen(skb);
1207 } else {
1208 skb_frag = skb_si->frags + frag;
1209 buffer = skb_frag_address(skb_frag);
1210 buflen = skb_frag_size(skb_frag);
1211 }
1212
1213 if (frag == last_frag) {
1214 word3 |= EOF_BIT;
1215 txq->skb[w] = skb;
1216 }
1217
1218 mapping = dma_map_single(geth->dev, buffer, buflen,
1219 DMA_TO_DEVICE);
1220 if (dma_mapping_error(geth->dev, mapping))
1221 goto map_error;
1222
1223 txd = txq->ring + w;
1224 txd->word0.bits32 = buflen;
1225 txd->word1.bits32 = word1;
1226 txd->word2.buf_adr = mapping;
1227 txd->word3.bits32 = word3;
1228
1229 word3 &= MTU_SIZE_BIT_MASK;
1230 w++;
1231 w &= m;
1232 frag++;
1233 }
1234
1235 *desc = w;
1236 return 0;
1237
1238 map_error:
1239 while (w != *desc) {
1240 w--;
1241 w &= m;
1242
1243 dma_unmap_page(geth->dev, txq->ring[w].word2.buf_adr,
1244 txq->ring[w].word0.bits.buffer_size,
1245 DMA_TO_DEVICE);
1246 }
1247 return -ENOMEM;
1248 }
1249
1250 static netdev_tx_t gmac_start_xmit(struct sk_buff *skb,
1251 struct net_device *netdev)
1252 {
1253 struct gemini_ethernet_port *port = netdev_priv(netdev);
1254 unsigned short m = (1 << port->txq_order) - 1;
1255 struct netdev_queue *ntxq;
1256 unsigned short r, w, d;
1257 void __iomem *ptr_reg;
1258 struct gmac_txq *txq;
1259 int txq_num, nfrags;
1260 union dma_rwptr rw;
1261
1262 if (skb->len >= 0x10000)
1263 goto out_drop_free;
1264
1265 txq_num = skb_get_queue_mapping(skb);
1266 ptr_reg = port->dma_base + GMAC_SW_TX_QUEUE_PTR_REG(txq_num);
1267 txq = &port->txq[txq_num];
1268 ntxq = netdev_get_tx_queue(netdev, txq_num);
1269 nfrags = skb_shinfo(skb)->nr_frags;
1270
1271 rw.bits32 = readl(ptr_reg);
1272 r = rw.bits.rptr;
1273 w = rw.bits.wptr;
1274
1275 d = txq->cptr - w - 1;
1276 d &= m;
1277
1278 if (d < nfrags + 2) {
1279 gmac_clean_txq(netdev, txq, r);
1280 d = txq->cptr - w - 1;
1281 d &= m;
1282
1283 if (d < nfrags + 2) {
1284 netif_tx_stop_queue(ntxq);
1285
1286 d = txq->cptr + nfrags + 16;
1287 d &= m;
1288 txq->ring[d].word3.bits.eofie = 1;
1289 gmac_tx_irq_enable(netdev, txq_num, 1);
1290
1291 u64_stats_update_begin(&port->tx_stats_syncp);
1292 netdev->stats.tx_fifo_errors++;
1293 u64_stats_update_end(&port->tx_stats_syncp);
1294 return NETDEV_TX_BUSY;
1295 }
1296 }
1297
1298 if (gmac_map_tx_bufs(netdev, skb, txq, &w)) {
1299 if (skb_linearize(skb))
1300 goto out_drop;
1301
1302 u64_stats_update_begin(&port->tx_stats_syncp);
1303 port->tx_frags_linearized++;
1304 u64_stats_update_end(&port->tx_stats_syncp);
1305
1306 if (gmac_map_tx_bufs(netdev, skb, txq, &w))
1307 goto out_drop_free;
1308 }
1309
1310 writew(w, ptr_reg + 2);
1311
1312 gmac_clean_txq(netdev, txq, r);
1313 return NETDEV_TX_OK;
1314
1315 out_drop_free:
1316 dev_kfree_skb(skb);
1317 out_drop:
1318 u64_stats_update_begin(&port->tx_stats_syncp);
1319 port->stats.tx_dropped++;
1320 u64_stats_update_end(&port->tx_stats_syncp);
1321 return NETDEV_TX_OK;
1322 }
1323
1324 static void gmac_tx_timeout(struct net_device *netdev, unsigned int txqueue)
1325 {
1326 netdev_err(netdev, "Tx timeout\n");
1327 gmac_dump_dma_state(netdev);
1328 }
1329
1330 static void gmac_enable_irq(struct net_device *netdev, int enable)
1331 {
1332 struct gemini_ethernet_port *port = netdev_priv(netdev);
1333 struct gemini_ethernet *geth = port->geth;
1334 unsigned long flags;
1335 u32 val, mask;
1336
1337 netdev_dbg(netdev, "%s device %d %s\n", __func__,
1338 netdev->dev_id, enable ? "enable" : "disable");
1339 spin_lock_irqsave(&geth->irq_lock, flags);
1340
1341 mask = GMAC0_IRQ0_2 << (netdev->dev_id * 2);
1342 val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
1343 val = enable ? (val | mask) : (val & ~mask);
1344 writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
1345
1346 mask = DEFAULT_Q0_INT_BIT << netdev->dev_id;
1347 val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG);
1348 val = enable ? (val | mask) : (val & ~mask);
1349 writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG);
1350
1351 mask = GMAC0_IRQ4_8 << (netdev->dev_id * 8);
1352 val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
1353 val = enable ? (val | mask) : (val & ~mask);
1354 writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
1355
1356 spin_unlock_irqrestore(&geth->irq_lock, flags);
1357 }
1358
1359 static void gmac_enable_rx_irq(struct net_device *netdev, int enable)
1360 {
1361 struct gemini_ethernet_port *port = netdev_priv(netdev);
1362 struct gemini_ethernet *geth = port->geth;
1363 unsigned long flags;
1364 u32 val, mask;
1365
1366 netdev_dbg(netdev, "%s device %d %s\n", __func__, netdev->dev_id,
1367 enable ? "enable" : "disable");
1368 spin_lock_irqsave(&geth->irq_lock, flags);
1369 mask = DEFAULT_Q0_INT_BIT << netdev->dev_id;
1370
1371 val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG);
1372 val = enable ? (val | mask) : (val & ~mask);
1373 writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG);
1374
1375 spin_unlock_irqrestore(&geth->irq_lock, flags);
1376 }
1377
1378 static struct sk_buff *gmac_skb_if_good_frame(struct gemini_ethernet_port *port,
1379 union gmac_rxdesc_0 word0,
1380 unsigned int frame_len)
1381 {
1382 unsigned int rx_csum = word0.bits.chksum_status;
1383 unsigned int rx_status = word0.bits.status;
1384 struct sk_buff *skb = NULL;
1385
1386 port->rx_stats[rx_status]++;
1387 port->rx_csum_stats[rx_csum]++;
1388
1389 if (word0.bits.derr || word0.bits.perr ||
1390 rx_status || frame_len < ETH_ZLEN ||
1391 rx_csum >= RX_CHKSUM_IP_ERR_UNKNOWN) {
1392 port->stats.rx_errors++;
1393
1394 if (frame_len < ETH_ZLEN || RX_ERROR_LENGTH(rx_status))
1395 port->stats.rx_length_errors++;
1396 if (RX_ERROR_OVER(rx_status))
1397 port->stats.rx_over_errors++;
1398 if (RX_ERROR_CRC(rx_status))
1399 port->stats.rx_crc_errors++;
1400 if (RX_ERROR_FRAME(rx_status))
1401 port->stats.rx_frame_errors++;
1402 return NULL;
1403 }
1404
1405 skb = napi_get_frags(&port->napi);
1406 if (!skb)
1407 goto update_exit;
1408
1409 if (rx_csum == RX_CHKSUM_IP_UDP_TCP_OK)
1410 skb->ip_summed = CHECKSUM_UNNECESSARY;
1411
1412 update_exit:
1413 port->stats.rx_bytes += frame_len;
1414 port->stats.rx_packets++;
1415 return skb;
1416 }
1417
1418 static unsigned int gmac_rx(struct net_device *netdev, unsigned int budget)
1419 {
1420 struct gemini_ethernet_port *port = netdev_priv(netdev);
1421 unsigned short m = (1 << port->rxq_order) - 1;
1422 struct gemini_ethernet *geth = port->geth;
1423 void __iomem *ptr_reg = port->rxq_rwptr;
1424 unsigned int frame_len, frag_len;
1425 struct gmac_rxdesc *rx = NULL;
1426 struct gmac_queue_page *gpage;
1427 static struct sk_buff *skb;
1428 union gmac_rxdesc_0 word0;
1429 union gmac_rxdesc_1 word1;
1430 union gmac_rxdesc_3 word3;
1431 struct page *page = NULL;
1432 unsigned int page_offs;
1433 unsigned long flags;
1434 unsigned short r, w;
1435 union dma_rwptr rw;
1436 dma_addr_t mapping;
1437 int frag_nr = 0;
1438
1439 spin_lock_irqsave(&geth->irq_lock, flags);
1440 rw.bits32 = readl(ptr_reg);
1441 /* Reset interrupt as all packages until here are taken into account */
1442 writel(DEFAULT_Q0_INT_BIT << netdev->dev_id,
1443 geth->base + GLOBAL_INTERRUPT_STATUS_1_REG);
1444 spin_unlock_irqrestore(&geth->irq_lock, flags);
1445
1446 r = rw.bits.rptr;
1447 w = rw.bits.wptr;
1448
1449 while (budget && w != r) {
1450 rx = port->rxq_ring + r;
1451 word0 = rx->word0;
1452 word1 = rx->word1;
1453 mapping = rx->word2.buf_adr;
1454 word3 = rx->word3;
1455
1456 r++;
1457 r &= m;
1458
1459 frag_len = word0.bits.buffer_size;
1460 frame_len = word1.bits.byte_count;
1461 page_offs = mapping & ~PAGE_MASK;
1462
1463 if (!mapping) {
1464 netdev_err(netdev,
1465 "rxq[%u]: HW BUG: zero DMA desc\n", r);
1466 goto err_drop;
1467 }
1468
1469 /* Freeq pointers are one page off */
1470 gpage = gmac_get_queue_page(geth, port, mapping + PAGE_SIZE);
1471 if (!gpage) {
1472 dev_err(geth->dev, "could not find mapping\n");
1473 continue;
1474 }
1475 page = gpage->page;
1476
1477 if (word3.bits32 & SOF_BIT) {
1478 if (skb) {
1479 napi_free_frags(&port->napi);
1480 port->stats.rx_dropped++;
1481 }
1482
1483 skb = gmac_skb_if_good_frame(port, word0, frame_len);
1484 if (!skb)
1485 goto err_drop;
1486
1487 page_offs += NET_IP_ALIGN;
1488 frag_len -= NET_IP_ALIGN;
1489 frag_nr = 0;
1490
1491 } else if (!skb) {
1492 put_page(page);
1493 continue;
1494 }
1495
1496 if (word3.bits32 & EOF_BIT)
1497 frag_len = frame_len - skb->len;
1498
1499 /* append page frag to skb */
1500 if (frag_nr == MAX_SKB_FRAGS)
1501 goto err_drop;
1502
1503 if (frag_len == 0)
1504 netdev_err(netdev, "Received fragment with len = 0\n");
1505
1506 skb_fill_page_desc(skb, frag_nr, page, page_offs, frag_len);
1507 skb->len += frag_len;
1508 skb->data_len += frag_len;
1509 skb->truesize += frag_len;
1510 frag_nr++;
1511
1512 if (word3.bits32 & EOF_BIT) {
1513 napi_gro_frags(&port->napi);
1514 skb = NULL;
1515 --budget;
1516 }
1517 continue;
1518
1519 err_drop:
1520 if (skb) {
1521 napi_free_frags(&port->napi);
1522 skb = NULL;
1523 }
1524
1525 if (mapping)
1526 put_page(page);
1527
1528 port->stats.rx_dropped++;
1529 }
1530
1531 writew(r, ptr_reg);
1532 return budget;
1533 }
1534
1535 static int gmac_napi_poll(struct napi_struct *napi, int budget)
1536 {
1537 struct gemini_ethernet_port *port = netdev_priv(napi->dev);
1538 struct gemini_ethernet *geth = port->geth;
1539 unsigned int freeq_threshold;
1540 unsigned int received;
1541
1542 freeq_threshold = 1 << (geth->freeq_order - 1);
1543 u64_stats_update_begin(&port->rx_stats_syncp);
1544
1545 received = gmac_rx(napi->dev, budget);
1546 if (received < budget) {
1547 napi_gro_flush(napi, false);
1548 napi_complete_done(napi, received);
1549 gmac_enable_rx_irq(napi->dev, 1);
1550 ++port->rx_napi_exits;
1551 }
1552
1553 port->freeq_refill += (budget - received);
1554 if (port->freeq_refill > freeq_threshold) {
1555 port->freeq_refill -= freeq_threshold;
1556 geth_fill_freeq(geth, true);
1557 }
1558
1559 u64_stats_update_end(&port->rx_stats_syncp);
1560 return received;
1561 }
1562
1563 static void gmac_dump_dma_state(struct net_device *netdev)
1564 {
1565 struct gemini_ethernet_port *port = netdev_priv(netdev);
1566 struct gemini_ethernet *geth = port->geth;
1567 void __iomem *ptr_reg;
1568 u32 reg[5];
1569
1570 /* Interrupt status */
1571 reg[0] = readl(geth->base + GLOBAL_INTERRUPT_STATUS_0_REG);
1572 reg[1] = readl(geth->base + GLOBAL_INTERRUPT_STATUS_1_REG);
1573 reg[2] = readl(geth->base + GLOBAL_INTERRUPT_STATUS_2_REG);
1574 reg[3] = readl(geth->base + GLOBAL_INTERRUPT_STATUS_3_REG);
1575 reg[4] = readl(geth->base + GLOBAL_INTERRUPT_STATUS_4_REG);
1576 netdev_err(netdev, "IRQ status: 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x\n",
1577 reg[0], reg[1], reg[2], reg[3], reg[4]);
1578
1579 /* Interrupt enable */
1580 reg[0] = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
1581 reg[1] = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG);
1582 reg[2] = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_2_REG);
1583 reg[3] = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_3_REG);
1584 reg[4] = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
1585 netdev_err(netdev, "IRQ enable: 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x\n",
1586 reg[0], reg[1], reg[2], reg[3], reg[4]);
1587
1588 /* RX DMA status */
1589 reg[0] = readl(port->dma_base + GMAC_DMA_RX_FIRST_DESC_REG);
1590 reg[1] = readl(port->dma_base + GMAC_DMA_RX_CURR_DESC_REG);
1591 reg[2] = GET_RPTR(port->rxq_rwptr);
1592 reg[3] = GET_WPTR(port->rxq_rwptr);
1593 netdev_err(netdev, "RX DMA regs: 0x%08x 0x%08x, ptr: %u %u\n",
1594 reg[0], reg[1], reg[2], reg[3]);
1595
1596 reg[0] = readl(port->dma_base + GMAC_DMA_RX_DESC_WORD0_REG);
1597 reg[1] = readl(port->dma_base + GMAC_DMA_RX_DESC_WORD1_REG);
1598 reg[2] = readl(port->dma_base + GMAC_DMA_RX_DESC_WORD2_REG);
1599 reg[3] = readl(port->dma_base + GMAC_DMA_RX_DESC_WORD3_REG);
1600 netdev_err(netdev, "RX DMA descriptor: 0x%08x 0x%08x 0x%08x 0x%08x\n",
1601 reg[0], reg[1], reg[2], reg[3]);
1602
1603 /* TX DMA status */
1604 ptr_reg = port->dma_base + GMAC_SW_TX_QUEUE0_PTR_REG;
1605
1606 reg[0] = readl(port->dma_base + GMAC_DMA_TX_FIRST_DESC_REG);
1607 reg[1] = readl(port->dma_base + GMAC_DMA_TX_CURR_DESC_REG);
1608 reg[2] = GET_RPTR(ptr_reg);
1609 reg[3] = GET_WPTR(ptr_reg);
1610 netdev_err(netdev, "TX DMA regs: 0x%08x 0x%08x, ptr: %u %u\n",
1611 reg[0], reg[1], reg[2], reg[3]);
1612
1613 reg[0] = readl(port->dma_base + GMAC_DMA_TX_DESC_WORD0_REG);
1614 reg[1] = readl(port->dma_base + GMAC_DMA_TX_DESC_WORD1_REG);
1615 reg[2] = readl(port->dma_base + GMAC_DMA_TX_DESC_WORD2_REG);
1616 reg[3] = readl(port->dma_base + GMAC_DMA_TX_DESC_WORD3_REG);
1617 netdev_err(netdev, "TX DMA descriptor: 0x%08x 0x%08x 0x%08x 0x%08x\n",
1618 reg[0], reg[1], reg[2], reg[3]);
1619
1620 /* FREE queues status */
1621 ptr_reg = geth->base + GLOBAL_SWFQ_RWPTR_REG;
1622
1623 reg[0] = GET_RPTR(ptr_reg);
1624 reg[1] = GET_WPTR(ptr_reg);
1625
1626 ptr_reg = geth->base + GLOBAL_HWFQ_RWPTR_REG;
1627
1628 reg[2] = GET_RPTR(ptr_reg);
1629 reg[3] = GET_WPTR(ptr_reg);
1630 netdev_err(netdev, "FQ SW ptr: %u %u, HW ptr: %u %u\n",
1631 reg[0], reg[1], reg[2], reg[3]);
1632 }
1633
1634 static void gmac_update_hw_stats(struct net_device *netdev)
1635 {
1636 struct gemini_ethernet_port *port = netdev_priv(netdev);
1637 unsigned int rx_discards, rx_mcast, rx_bcast;
1638 struct gemini_ethernet *geth = port->geth;
1639 unsigned long flags;
1640
1641 spin_lock_irqsave(&geth->irq_lock, flags);
1642 u64_stats_update_begin(&port->ir_stats_syncp);
1643
1644 rx_discards = readl(port->gmac_base + GMAC_IN_DISCARDS);
1645 port->hw_stats[0] += rx_discards;
1646 port->hw_stats[1] += readl(port->gmac_base + GMAC_IN_ERRORS);
1647 rx_mcast = readl(port->gmac_base + GMAC_IN_MCAST);
1648 port->hw_stats[2] += rx_mcast;
1649 rx_bcast = readl(port->gmac_base + GMAC_IN_BCAST);
1650 port->hw_stats[3] += rx_bcast;
1651 port->hw_stats[4] += readl(port->gmac_base + GMAC_IN_MAC1);
1652 port->hw_stats[5] += readl(port->gmac_base + GMAC_IN_MAC2);
1653
1654 port->stats.rx_missed_errors += rx_discards;
1655 port->stats.multicast += rx_mcast;
1656 port->stats.multicast += rx_bcast;
1657
1658 writel(GMAC0_MIB_INT_BIT << (netdev->dev_id * 8),
1659 geth->base + GLOBAL_INTERRUPT_STATUS_4_REG);
1660
1661 u64_stats_update_end(&port->ir_stats_syncp);
1662 spin_unlock_irqrestore(&geth->irq_lock, flags);
1663 }
1664
1665 /**
1666 * gmac_get_intr_flags() - get interrupt status flags for a port from
1667 * @netdev: the net device for the port to get flags from
1668 * @i: the interrupt status register 0..4
1669 */
1670 static u32 gmac_get_intr_flags(struct net_device *netdev, int i)
1671 {
1672 struct gemini_ethernet_port *port = netdev_priv(netdev);
1673 struct gemini_ethernet *geth = port->geth;
1674 void __iomem *irqif_reg, *irqen_reg;
1675 unsigned int offs, val;
1676
1677 /* Calculate the offset using the stride of the status registers */
1678 offs = i * (GLOBAL_INTERRUPT_STATUS_1_REG -
1679 GLOBAL_INTERRUPT_STATUS_0_REG);
1680
1681 irqif_reg = geth->base + GLOBAL_INTERRUPT_STATUS_0_REG + offs;
1682 irqen_reg = geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG + offs;
1683
1684 val = readl(irqif_reg) & readl(irqen_reg);
1685 return val;
1686 }
1687
1688 static enum hrtimer_restart gmac_coalesce_delay_expired(struct hrtimer *timer)
1689 {
1690 struct gemini_ethernet_port *port =
1691 container_of(timer, struct gemini_ethernet_port,
1692 rx_coalesce_timer);
1693
1694 napi_schedule(&port->napi);
1695 return HRTIMER_NORESTART;
1696 }
1697
1698 static irqreturn_t gmac_irq(int irq, void *data)
1699 {
1700 struct gemini_ethernet_port *port;
1701 struct net_device *netdev = data;
1702 struct gemini_ethernet *geth;
1703 u32 val, orr = 0;
1704
1705 port = netdev_priv(netdev);
1706 geth = port->geth;
1707
1708 val = gmac_get_intr_flags(netdev, 0);
1709 orr |= val;
1710
1711 if (val & (GMAC0_IRQ0_2 << (netdev->dev_id * 2))) {
1712 /* Oh, crap */
1713 netdev_err(netdev, "hw failure/sw bug\n");
1714 gmac_dump_dma_state(netdev);
1715
1716 /* don't know how to recover, just reduce losses */
1717 gmac_enable_irq(netdev, 0);
1718 return IRQ_HANDLED;
1719 }
1720
1721 if (val & (GMAC0_IRQ0_TXQ0_INTS << (netdev->dev_id * 6)))
1722 gmac_tx_irq(netdev, 0);
1723
1724 val = gmac_get_intr_flags(netdev, 1);
1725 orr |= val;
1726
1727 if (val & (DEFAULT_Q0_INT_BIT << netdev->dev_id)) {
1728 gmac_enable_rx_irq(netdev, 0);
1729
1730 if (!port->rx_coalesce_nsecs) {
1731 napi_schedule(&port->napi);
1732 } else {
1733 ktime_t ktime;
1734
1735 ktime = ktime_set(0, port->rx_coalesce_nsecs);
1736 hrtimer_start(&port->rx_coalesce_timer, ktime,
1737 HRTIMER_MODE_REL);
1738 }
1739 }
1740
1741 val = gmac_get_intr_flags(netdev, 4);
1742 orr |= val;
1743
1744 if (val & (GMAC0_MIB_INT_BIT << (netdev->dev_id * 8)))
1745 gmac_update_hw_stats(netdev);
1746
1747 if (val & (GMAC0_RX_OVERRUN_INT_BIT << (netdev->dev_id * 8))) {
1748 spin_lock(&geth->irq_lock);
1749 writel(GMAC0_RXDERR_INT_BIT << (netdev->dev_id * 8),
1750 geth->base + GLOBAL_INTERRUPT_STATUS_4_REG);
1751 u64_stats_update_begin(&port->ir_stats_syncp);
1752 ++port->stats.rx_fifo_errors;
1753 u64_stats_update_end(&port->ir_stats_syncp);
1754 spin_unlock(&geth->irq_lock);
1755 }
1756
1757 return orr ? IRQ_HANDLED : IRQ_NONE;
1758 }
1759
1760 static void gmac_start_dma(struct gemini_ethernet_port *port)
1761 {
1762 void __iomem *dma_ctrl_reg = port->dma_base + GMAC_DMA_CTRL_REG;
1763 union gmac_dma_ctrl dma_ctrl;
1764
1765 dma_ctrl.bits32 = readl(dma_ctrl_reg);
1766 dma_ctrl.bits.rd_enable = 1;
1767 dma_ctrl.bits.td_enable = 1;
1768 dma_ctrl.bits.loopback = 0;
1769 dma_ctrl.bits.drop_small_ack = 0;
1770 dma_ctrl.bits.rd_insert_bytes = NET_IP_ALIGN;
1771 dma_ctrl.bits.rd_prot = HPROT_DATA_CACHE | HPROT_PRIVILIGED;
1772 dma_ctrl.bits.rd_burst_size = HBURST_INCR8;
1773 dma_ctrl.bits.rd_bus = HSIZE_8;
1774 dma_ctrl.bits.td_prot = HPROT_DATA_CACHE;
1775 dma_ctrl.bits.td_burst_size = HBURST_INCR8;
1776 dma_ctrl.bits.td_bus = HSIZE_8;
1777
1778 writel(dma_ctrl.bits32, dma_ctrl_reg);
1779 }
1780
1781 static void gmac_stop_dma(struct gemini_ethernet_port *port)
1782 {
1783 void __iomem *dma_ctrl_reg = port->dma_base + GMAC_DMA_CTRL_REG;
1784 union gmac_dma_ctrl dma_ctrl;
1785
1786 dma_ctrl.bits32 = readl(dma_ctrl_reg);
1787 dma_ctrl.bits.rd_enable = 0;
1788 dma_ctrl.bits.td_enable = 0;
1789 writel(dma_ctrl.bits32, dma_ctrl_reg);
1790 }
1791
1792 static int gmac_open(struct net_device *netdev)
1793 {
1794 struct gemini_ethernet_port *port = netdev_priv(netdev);
1795 int err;
1796
1797 err = request_irq(netdev->irq, gmac_irq,
1798 IRQF_SHARED, netdev->name, netdev);
1799 if (err) {
1800 netdev_err(netdev, "no IRQ\n");
1801 return err;
1802 }
1803
1804 netif_carrier_off(netdev);
1805 phy_start(netdev->phydev);
1806
1807 err = geth_resize_freeq(port);
1808 /* It's fine if it's just busy, the other port has set up
1809 * the freeq in that case.
1810 */
1811 if (err && (err != -EBUSY)) {
1812 netdev_err(netdev, "could not resize freeq\n");
1813 goto err_stop_phy;
1814 }
1815
1816 err = gmac_setup_rxq(netdev);
1817 if (err) {
1818 netdev_err(netdev, "could not setup RXQ\n");
1819 goto err_stop_phy;
1820 }
1821
1822 err = gmac_setup_txqs(netdev);
1823 if (err) {
1824 netdev_err(netdev, "could not setup TXQs\n");
1825 gmac_cleanup_rxq(netdev);
1826 goto err_stop_phy;
1827 }
1828
1829 napi_enable(&port->napi);
1830
1831 gmac_start_dma(port);
1832 gmac_enable_irq(netdev, 1);
1833 gmac_enable_tx_rx(netdev);
1834 netif_tx_start_all_queues(netdev);
1835
1836 hrtimer_init(&port->rx_coalesce_timer, CLOCK_MONOTONIC,
1837 HRTIMER_MODE_REL);
1838 port->rx_coalesce_timer.function = &gmac_coalesce_delay_expired;
1839
1840 netdev_dbg(netdev, "opened\n");
1841
1842 return 0;
1843
1844 err_stop_phy:
1845 phy_stop(netdev->phydev);
1846 free_irq(netdev->irq, netdev);
1847 return err;
1848 }
1849
1850 static int gmac_stop(struct net_device *netdev)
1851 {
1852 struct gemini_ethernet_port *port = netdev_priv(netdev);
1853
1854 hrtimer_cancel(&port->rx_coalesce_timer);
1855 netif_tx_stop_all_queues(netdev);
1856 gmac_disable_tx_rx(netdev);
1857 gmac_stop_dma(port);
1858 napi_disable(&port->napi);
1859
1860 gmac_enable_irq(netdev, 0);
1861 gmac_cleanup_rxq(netdev);
1862 gmac_cleanup_txqs(netdev);
1863
1864 phy_stop(netdev->phydev);
1865 free_irq(netdev->irq, netdev);
1866
1867 gmac_update_hw_stats(netdev);
1868 return 0;
1869 }
1870
1871 static void gmac_set_rx_mode(struct net_device *netdev)
1872 {
1873 struct gemini_ethernet_port *port = netdev_priv(netdev);
1874 union gmac_rx_fltr filter = { .bits = {
1875 .broadcast = 1,
1876 .multicast = 1,
1877 .unicast = 1,
1878 } };
1879 struct netdev_hw_addr *ha;
1880 unsigned int bit_nr;
1881 u32 mc_filter[2];
1882
1883 mc_filter[1] = 0;
1884 mc_filter[0] = 0;
1885
1886 if (netdev->flags & IFF_PROMISC) {
1887 filter.bits.error = 1;
1888 filter.bits.promiscuous = 1;
1889 mc_filter[1] = ~0;
1890 mc_filter[0] = ~0;
1891 } else if (netdev->flags & IFF_ALLMULTI) {
1892 mc_filter[1] = ~0;
1893 mc_filter[0] = ~0;
1894 } else {
1895 netdev_for_each_mc_addr(ha, netdev) {
1896 bit_nr = ~crc32_le(~0, ha->addr, ETH_ALEN) & 0x3f;
1897 mc_filter[bit_nr >> 5] |= 1 << (bit_nr & 0x1f);
1898 }
1899 }
1900
1901 writel(mc_filter[0], port->gmac_base + GMAC_MCAST_FIL0);
1902 writel(mc_filter[1], port->gmac_base + GMAC_MCAST_FIL1);
1903 writel(filter.bits32, port->gmac_base + GMAC_RX_FLTR);
1904 }
1905
1906 static void gmac_write_mac_address(struct net_device *netdev)
1907 {
1908 struct gemini_ethernet_port *port = netdev_priv(netdev);
1909 __le32 addr[3];
1910
1911 memset(addr, 0, sizeof(addr));
1912 memcpy(addr, netdev->dev_addr, ETH_ALEN);
1913
1914 writel(le32_to_cpu(addr[0]), port->gmac_base + GMAC_STA_ADD0);
1915 writel(le32_to_cpu(addr[1]), port->gmac_base + GMAC_STA_ADD1);
1916 writel(le32_to_cpu(addr[2]), port->gmac_base + GMAC_STA_ADD2);
1917 }
1918
1919 static int gmac_set_mac_address(struct net_device *netdev, void *addr)
1920 {
1921 struct sockaddr *sa = addr;
1922
1923 eth_hw_addr_set(netdev, sa->sa_data);
1924 gmac_write_mac_address(netdev);
1925
1926 return 0;
1927 }
1928
1929 static void gmac_clear_hw_stats(struct net_device *netdev)
1930 {
1931 struct gemini_ethernet_port *port = netdev_priv(netdev);
1932
1933 readl(port->gmac_base + GMAC_IN_DISCARDS);
1934 readl(port->gmac_base + GMAC_IN_ERRORS);
1935 readl(port->gmac_base + GMAC_IN_MCAST);
1936 readl(port->gmac_base + GMAC_IN_BCAST);
1937 readl(port->gmac_base + GMAC_IN_MAC1);
1938 readl(port->gmac_base + GMAC_IN_MAC2);
1939 }
1940
1941 static void gmac_get_stats64(struct net_device *netdev,
1942 struct rtnl_link_stats64 *stats)
1943 {
1944 struct gemini_ethernet_port *port = netdev_priv(netdev);
1945 unsigned int start;
1946
1947 gmac_update_hw_stats(netdev);
1948
1949 /* Racing with RX NAPI */
1950 do {
1951 start = u64_stats_fetch_begin(&port->rx_stats_syncp);
1952
1953 stats->rx_packets = port->stats.rx_packets;
1954 stats->rx_bytes = port->stats.rx_bytes;
1955 stats->rx_errors = port->stats.rx_errors;
1956 stats->rx_dropped = port->stats.rx_dropped;
1957
1958 stats->rx_length_errors = port->stats.rx_length_errors;
1959 stats->rx_over_errors = port->stats.rx_over_errors;
1960 stats->rx_crc_errors = port->stats.rx_crc_errors;
1961 stats->rx_frame_errors = port->stats.rx_frame_errors;
1962
1963 } while (u64_stats_fetch_retry(&port->rx_stats_syncp, start));
1964
1965 /* Racing with MIB and TX completion interrupts */
1966 do {
1967 start = u64_stats_fetch_begin(&port->ir_stats_syncp);
1968
1969 stats->tx_errors = port->stats.tx_errors;
1970 stats->tx_packets = port->stats.tx_packets;
1971 stats->tx_bytes = port->stats.tx_bytes;
1972
1973 stats->multicast = port->stats.multicast;
1974 stats->rx_missed_errors = port->stats.rx_missed_errors;
1975 stats->rx_fifo_errors = port->stats.rx_fifo_errors;
1976
1977 } while (u64_stats_fetch_retry(&port->ir_stats_syncp, start));
1978
1979 /* Racing with hard_start_xmit */
1980 do {
1981 start = u64_stats_fetch_begin(&port->tx_stats_syncp);
1982
1983 stats->tx_dropped = port->stats.tx_dropped;
1984
1985 } while (u64_stats_fetch_retry(&port->tx_stats_syncp, start));
1986
1987 stats->rx_dropped += stats->rx_missed_errors;
1988 }
1989
1990 static int gmac_change_mtu(struct net_device *netdev, int new_mtu)
1991 {
1992 int max_len = gmac_pick_rx_max_len(new_mtu);
1993
1994 if (max_len < 0)
1995 return -EINVAL;
1996
1997 gmac_disable_tx_rx(netdev);
1998
1999 WRITE_ONCE(netdev->mtu, new_mtu);
2000 gmac_update_config0_reg(netdev, max_len << CONFIG0_MAXLEN_SHIFT,
2001 CONFIG0_MAXLEN_MASK);
2002
2003 netdev_update_features(netdev);
2004
2005 gmac_enable_tx_rx(netdev);
2006
2007 return 0;
2008 }
2009
2010 static int gmac_set_features(struct net_device *netdev,
2011 netdev_features_t features)
2012 {
2013 struct gemini_ethernet_port *port = netdev_priv(netdev);
2014 int enable = features & NETIF_F_RXCSUM;
2015 unsigned long flags;
2016 u32 reg;
2017
2018 spin_lock_irqsave(&port->config_lock, flags);
2019
2020 reg = readl(port->gmac_base + GMAC_CONFIG0);
2021 reg = enable ? reg | CONFIG0_RX_CHKSUM : reg & ~CONFIG0_RX_CHKSUM;
2022 writel(reg, port->gmac_base + GMAC_CONFIG0);
2023
2024 spin_unlock_irqrestore(&port->config_lock, flags);
2025 return 0;
2026 }
2027
2028 static int gmac_get_sset_count(struct net_device *netdev, int sset)
2029 {
2030 return sset == ETH_SS_STATS ? GMAC_STATS_NUM : 0;
2031 }
2032
2033 static void gmac_get_strings(struct net_device *netdev, u32 stringset, u8 *data)
2034 {
2035 if (stringset != ETH_SS_STATS)
2036 return;
2037
2038 memcpy(data, gmac_stats_strings, sizeof(gmac_stats_strings));
2039 }
2040
2041 static void gmac_get_ethtool_stats(struct net_device *netdev,
2042 struct ethtool_stats *estats, u64 *values)
2043 {
2044 struct gemini_ethernet_port *port = netdev_priv(netdev);
2045 unsigned int start;
2046 u64 *p;
2047 int i;
2048
2049 gmac_update_hw_stats(netdev);
2050
2051 /* Racing with MIB interrupt */
2052 do {
2053 p = values;
2054 start = u64_stats_fetch_begin(&port->ir_stats_syncp);
2055
2056 for (i = 0; i < RX_STATS_NUM; i++)
2057 *p++ = port->hw_stats[i];
2058
2059 } while (u64_stats_fetch_retry(&port->ir_stats_syncp, start));
2060 values = p;
2061
2062 /* Racing with RX NAPI */
2063 do {
2064 p = values;
2065 start = u64_stats_fetch_begin(&port->rx_stats_syncp);
2066
2067 for (i = 0; i < RX_STATUS_NUM; i++)
2068 *p++ = port->rx_stats[i];
2069 for (i = 0; i < RX_CHKSUM_NUM; i++)
2070 *p++ = port->rx_csum_stats[i];
2071 *p++ = port->rx_napi_exits;
2072
2073 } while (u64_stats_fetch_retry(&port->rx_stats_syncp, start));
2074 values = p;
2075
2076 /* Racing with TX start_xmit */
2077 do {
2078 p = values;
2079 start = u64_stats_fetch_begin(&port->tx_stats_syncp);
2080
2081 for (i = 0; i < TX_MAX_FRAGS; i++) {
2082 *values++ = port->tx_frag_stats[i];
2083 port->tx_frag_stats[i] = 0;
2084 }
2085 *values++ = port->tx_frags_linearized;
2086 *values++ = port->tx_hw_csummed;
2087
2088 } while (u64_stats_fetch_retry(&port->tx_stats_syncp, start));
2089 }
2090
2091 static int gmac_get_ksettings(struct net_device *netdev,
2092 struct ethtool_link_ksettings *cmd)
2093 {
2094 if (!netdev->phydev)
2095 return -ENXIO;
2096 phy_ethtool_ksettings_get(netdev->phydev, cmd);
2097
2098 return 0;
2099 }
2100
2101 static int gmac_set_ksettings(struct net_device *netdev,
2102 const struct ethtool_link_ksettings *cmd)
2103 {
2104 if (!netdev->phydev)
2105 return -ENXIO;
2106 return phy_ethtool_ksettings_set(netdev->phydev, cmd);
2107 }
2108
2109 static int gmac_nway_reset(struct net_device *netdev)
2110 {
2111 if (!netdev->phydev)
2112 return -ENXIO;
2113 return phy_start_aneg(netdev->phydev);
2114 }
2115
2116 static void gmac_get_pauseparam(struct net_device *netdev,
2117 struct ethtool_pauseparam *pparam)
2118 {
2119 struct gemini_ethernet_port *port = netdev_priv(netdev);
2120 union gmac_config0 config0;
2121
2122 config0.bits32 = readl(port->gmac_base + GMAC_CONFIG0);
2123
2124 pparam->rx_pause = config0.bits.rx_fc_en;
2125 pparam->tx_pause = config0.bits.tx_fc_en;
2126 pparam->autoneg = true;
2127 }
2128
2129 static int gmac_set_pauseparam(struct net_device *netdev,
2130 struct ethtool_pauseparam *pparam)
2131 {
2132 struct phy_device *phydev = netdev->phydev;
2133
2134 if (!pparam->autoneg)
2135 return -EOPNOTSUPP;
2136
2137 phy_set_asym_pause(phydev, pparam->rx_pause, pparam->tx_pause);
2138
2139 return 0;
2140 }
2141
2142 static void gmac_get_ringparam(struct net_device *netdev,
2143 struct ethtool_ringparam *rp,
2144 struct kernel_ethtool_ringparam *kernel_rp,
2145 struct netlink_ext_ack *extack)
2146 {
2147 struct gemini_ethernet_port *port = netdev_priv(netdev);
2148
2149 readl(port->gmac_base + GMAC_CONFIG0);
2150
2151 rp->rx_max_pending = 1 << 15;
2152 rp->rx_mini_max_pending = 0;
2153 rp->rx_jumbo_max_pending = 0;
2154 rp->tx_max_pending = 1 << 15;
2155
2156 rp->rx_pending = 1 << port->rxq_order;
2157 rp->rx_mini_pending = 0;
2158 rp->rx_jumbo_pending = 0;
2159 rp->tx_pending = 1 << port->txq_order;
2160 }
2161
2162 static int gmac_set_ringparam(struct net_device *netdev,
2163 struct ethtool_ringparam *rp,
2164 struct kernel_ethtool_ringparam *kernel_rp,
2165 struct netlink_ext_ack *extack)
2166 {
2167 struct gemini_ethernet_port *port = netdev_priv(netdev);
2168 int err = 0;
2169
2170 if (netif_running(netdev))
2171 return -EBUSY;
2172
2173 if (rp->rx_pending) {
2174 port->rxq_order = min(15, ilog2(rp->rx_pending - 1) + 1);
2175 err = geth_resize_freeq(port);
2176 }
2177 if (rp->tx_pending) {
2178 port->txq_order = min(15, ilog2(rp->tx_pending - 1) + 1);
2179 port->irq_every_tx_packets = 1 << (port->txq_order - 2);
2180 }
2181
2182 return err;
2183 }
2184
2185 static int gmac_get_coalesce(struct net_device *netdev,
2186 struct ethtool_coalesce *ecmd,
2187 struct kernel_ethtool_coalesce *kernel_coal,
2188 struct netlink_ext_ack *extack)
2189 {
2190 struct gemini_ethernet_port *port = netdev_priv(netdev);
2191
2192 ecmd->rx_max_coalesced_frames = 1;
2193 ecmd->tx_max_coalesced_frames = port->irq_every_tx_packets;
2194 ecmd->rx_coalesce_usecs = port->rx_coalesce_nsecs / 1000;
2195
2196 return 0;
2197 }
2198
2199 static int gmac_set_coalesce(struct net_device *netdev,
2200 struct ethtool_coalesce *ecmd,
2201 struct kernel_ethtool_coalesce *kernel_coal,
2202 struct netlink_ext_ack *extack)
2203 {
2204 struct gemini_ethernet_port *port = netdev_priv(netdev);
2205
2206 if (ecmd->tx_max_coalesced_frames < 1)
2207 return -EINVAL;
2208 if (ecmd->tx_max_coalesced_frames >= 1 << port->txq_order)
2209 return -EINVAL;
2210
2211 port->irq_every_tx_packets = ecmd->tx_max_coalesced_frames;
2212 port->rx_coalesce_nsecs = ecmd->rx_coalesce_usecs * 1000;
2213
2214 return 0;
2215 }
2216
2217 static u32 gmac_get_msglevel(struct net_device *netdev)
2218 {
2219 struct gemini_ethernet_port *port = netdev_priv(netdev);
2220
2221 return port->msg_enable;
2222 }
2223
2224 static void gmac_set_msglevel(struct net_device *netdev, u32 level)
2225 {
2226 struct gemini_ethernet_port *port = netdev_priv(netdev);
2227
2228 port->msg_enable = level;
2229 }
2230
2231 static void gmac_get_drvinfo(struct net_device *netdev,
2232 struct ethtool_drvinfo *info)
2233 {
2234 strcpy(info->driver, DRV_NAME);
2235 strcpy(info->bus_info, netdev->dev_id ? "1" : "0");
2236 }
2237
2238 static const struct net_device_ops gmac_351x_ops = {
2239 .ndo_init = gmac_init,
2240 .ndo_open = gmac_open,
2241 .ndo_stop = gmac_stop,
2242 .ndo_start_xmit = gmac_start_xmit,
2243 .ndo_tx_timeout = gmac_tx_timeout,
2244 .ndo_set_rx_mode = gmac_set_rx_mode,
2245 .ndo_set_mac_address = gmac_set_mac_address,
2246 .ndo_get_stats64 = gmac_get_stats64,
2247 .ndo_change_mtu = gmac_change_mtu,
2248 .ndo_set_features = gmac_set_features,
2249 };
2250
2251 static const struct ethtool_ops gmac_351x_ethtool_ops = {
2252 .supported_coalesce_params = ETHTOOL_COALESCE_RX_USECS |
2253 ETHTOOL_COALESCE_MAX_FRAMES,
2254 .get_sset_count = gmac_get_sset_count,
2255 .get_strings = gmac_get_strings,
2256 .get_ethtool_stats = gmac_get_ethtool_stats,
2257 .get_link = ethtool_op_get_link,
2258 .get_link_ksettings = gmac_get_ksettings,
2259 .set_link_ksettings = gmac_set_ksettings,
2260 .nway_reset = gmac_nway_reset,
2261 .get_pauseparam = gmac_get_pauseparam,
2262 .set_pauseparam = gmac_set_pauseparam,
2263 .get_ringparam = gmac_get_ringparam,
2264 .set_ringparam = gmac_set_ringparam,
2265 .get_coalesce = gmac_get_coalesce,
2266 .set_coalesce = gmac_set_coalesce,
2267 .get_msglevel = gmac_get_msglevel,
2268 .set_msglevel = gmac_set_msglevel,
2269 .get_drvinfo = gmac_get_drvinfo,
2270 };
2271
2272 static irqreturn_t gemini_port_irq_thread(int irq, void *data)
2273 {
2274 unsigned long irqmask = SWFQ_EMPTY_INT_BIT;
2275 struct gemini_ethernet_port *port = data;
2276 struct gemini_ethernet *geth;
2277 unsigned long flags;
2278
2279 geth = port->geth;
2280 /* The queue is half empty so refill it */
2281 geth_fill_freeq(geth, true);
2282
2283 spin_lock_irqsave(&geth->irq_lock, flags);
2284 /* ACK queue interrupt */
2285 writel(irqmask, geth->base + GLOBAL_INTERRUPT_STATUS_4_REG);
2286 /* Enable queue interrupt again */
2287 irqmask |= readl(geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
2288 writel(irqmask, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
2289 spin_unlock_irqrestore(&geth->irq_lock, flags);
2290
2291 return IRQ_HANDLED;
2292 }
2293
2294 static irqreturn_t gemini_port_irq(int irq, void *data)
2295 {
2296 struct gemini_ethernet_port *port = data;
2297 struct gemini_ethernet *geth;
2298 irqreturn_t ret = IRQ_NONE;
2299 u32 val, en;
2300
2301 geth = port->geth;
2302 spin_lock(&geth->irq_lock);
2303
2304 val = readl(geth->base + GLOBAL_INTERRUPT_STATUS_4_REG);
2305 en = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
2306
2307 if (val & en & SWFQ_EMPTY_INT_BIT) {
2308 /* Disable the queue empty interrupt while we work on
2309 * processing the queue. Also disable overrun interrupts
2310 * as there is not much we can do about it here.
2311 */
2312 en &= ~(SWFQ_EMPTY_INT_BIT | GMAC0_RX_OVERRUN_INT_BIT
2313 | GMAC1_RX_OVERRUN_INT_BIT);
2314 writel(en, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
2315 ret = IRQ_WAKE_THREAD;
2316 }
2317
2318 spin_unlock(&geth->irq_lock);
2319
2320 return ret;
2321 }
2322
2323 static void gemini_port_remove(struct gemini_ethernet_port *port)
2324 {
2325 if (port->netdev) {
2326 phy_disconnect(port->netdev->phydev);
2327 unregister_netdev(port->netdev);
2328 }
2329 clk_disable_unprepare(port->pclk);
2330 geth_cleanup_freeq(port->geth);
2331 }
2332
2333 static void gemini_ethernet_init(struct gemini_ethernet *geth)
2334 {
2335 /* Only do this once both ports are online */
2336 if (geth->initialized)
2337 return;
2338 if (geth->port0 && geth->port1)
2339 geth->initialized = true;
2340 else
2341 return;
2342
2343 writel(0, geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
2344 writel(0, geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG);
2345 writel(0, geth->base + GLOBAL_INTERRUPT_ENABLE_2_REG);
2346 writel(0, geth->base + GLOBAL_INTERRUPT_ENABLE_3_REG);
2347 writel(0, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
2348
2349 /* Interrupt config:
2350 *
2351 * GMAC0 intr bits ------> int0 ----> eth0
2352 * GMAC1 intr bits ------> int1 ----> eth1
2353 * TOE intr -------------> int1 ----> eth1
2354 * Classification Intr --> int0 ----> eth0
2355 * Default Q0 -----------> int0 ----> eth0
2356 * Default Q1 -----------> int1 ----> eth1
2357 * FreeQ intr -----------> int1 ----> eth1
2358 */
2359 writel(0xCCFC0FC0, geth->base + GLOBAL_INTERRUPT_SELECT_0_REG);
2360 writel(0x00F00002, geth->base + GLOBAL_INTERRUPT_SELECT_1_REG);
2361 writel(0xFFFFFFFF, geth->base + GLOBAL_INTERRUPT_SELECT_2_REG);
2362 writel(0xFFFFFFFF, geth->base + GLOBAL_INTERRUPT_SELECT_3_REG);
2363 writel(0xFF000003, geth->base + GLOBAL_INTERRUPT_SELECT_4_REG);
2364
2365 /* edge-triggered interrupts packed to level-triggered one... */
2366 writel(~0, geth->base + GLOBAL_INTERRUPT_STATUS_0_REG);
2367 writel(~0, geth->base + GLOBAL_INTERRUPT_STATUS_1_REG);
2368 writel(~0, geth->base + GLOBAL_INTERRUPT_STATUS_2_REG);
2369 writel(~0, geth->base + GLOBAL_INTERRUPT_STATUS_3_REG);
2370 writel(~0, geth->base + GLOBAL_INTERRUPT_STATUS_4_REG);
2371
2372 /* Set up queue */
2373 writel(0, geth->base + GLOBAL_SW_FREEQ_BASE_SIZE_REG);
2374 writel(0, geth->base + GLOBAL_HW_FREEQ_BASE_SIZE_REG);
2375 writel(0, geth->base + GLOBAL_SWFQ_RWPTR_REG);
2376 writel(0, geth->base + GLOBAL_HWFQ_RWPTR_REG);
2377
2378 geth->freeq_frag_order = DEFAULT_RX_BUF_ORDER;
2379 /* This makes the queue resize on probe() so that we
2380 * set up and enable the queue IRQ. FIXME: fragile.
2381 */
2382 geth->freeq_order = 1;
2383 }
2384
2385 static void gemini_port_save_mac_addr(struct gemini_ethernet_port *port)
2386 {
2387 port->mac_addr[0] =
2388 cpu_to_le32(readl(port->gmac_base + GMAC_STA_ADD0));
2389 port->mac_addr[1] =
2390 cpu_to_le32(readl(port->gmac_base + GMAC_STA_ADD1));
2391 port->mac_addr[2] =
2392 cpu_to_le32(readl(port->gmac_base + GMAC_STA_ADD2));
2393 }
2394
2395 static int gemini_ethernet_port_probe(struct platform_device *pdev)
2396 {
2397 char *port_names[2] = { "ethernet0", "ethernet1" };
2398 struct device_node *np = pdev->dev.of_node;
2399 struct gemini_ethernet_port *port;
2400 struct device *dev = &pdev->dev;
2401 struct gemini_ethernet *geth;
2402 struct net_device *netdev;
2403 struct device *parent;
2404 u8 mac[ETH_ALEN];
2405 unsigned int id;
2406 int irq;
2407 int ret;
2408
2409 parent = dev->parent;
2410 geth = dev_get_drvdata(parent);
2411
2412 if (!strcmp(dev_name(dev), "60008000.ethernet-port"))
2413 id = 0;
2414 else if (!strcmp(dev_name(dev), "6000c000.ethernet-port"))
2415 id = 1;
2416 else
2417 return -ENODEV;
2418
2419 dev_info(dev, "probe %s ID %d\n", dev_name(dev), id);
2420
2421 netdev = devm_alloc_etherdev_mqs(dev, sizeof(*port), TX_QUEUE_NUM, TX_QUEUE_NUM);
2422 if (!netdev) {
2423 dev_err(dev, "Can't allocate ethernet device #%d\n", id);
2424 return -ENOMEM;
2425 }
2426
2427 port = netdev_priv(netdev);
2428 SET_NETDEV_DEV(netdev, dev);
2429 port->netdev = netdev;
2430 port->id = id;
2431 port->geth = geth;
2432 port->dev = dev;
2433 port->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
2434
2435 /* DMA memory */
2436 port->dma_base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
2437 if (IS_ERR(port->dma_base)) {
2438 dev_err(dev, "get DMA address failed\n");
2439 return PTR_ERR(port->dma_base);
2440 }
2441
2442 /* GMAC config memory */
2443 port->gmac_base = devm_platform_get_and_ioremap_resource(pdev, 1, NULL);
2444 if (IS_ERR(port->gmac_base)) {
2445 dev_err(dev, "get GMAC address failed\n");
2446 return PTR_ERR(port->gmac_base);
2447 }
2448
2449 /* Interrupt */
2450 irq = platform_get_irq(pdev, 0);
2451 if (irq < 0)
2452 return irq;
2453 port->irq = irq;
2454
2455 /* Clock the port */
2456 port->pclk = devm_clk_get(dev, "PCLK");
2457 if (IS_ERR(port->pclk)) {
2458 dev_err(dev, "no PCLK\n");
2459 return PTR_ERR(port->pclk);
2460 }
2461 ret = clk_prepare_enable(port->pclk);
2462 if (ret)
2463 return ret;
2464
2465 /* Maybe there is a nice ethernet address we should use */
2466 gemini_port_save_mac_addr(port);
2467
2468 /* Reset the port */
2469 port->reset = devm_reset_control_get_exclusive(dev, NULL);
2470 if (IS_ERR(port->reset)) {
2471 dev_err(dev, "no reset\n");
2472 ret = PTR_ERR(port->reset);
2473 goto unprepare;
2474 }
2475 reset_control_reset(port->reset);
2476 usleep_range(100, 500);
2477
2478 /* Assign pointer in the main state container */
2479 if (!id)
2480 geth->port0 = port;
2481 else
2482 geth->port1 = port;
2483
2484 /* This will just be done once both ports are up and reset */
2485 gemini_ethernet_init(geth);
2486
2487 platform_set_drvdata(pdev, port);
2488
2489 /* Set up and register the netdev */
2490 netdev->dev_id = port->id;
2491 netdev->irq = irq;
2492 netdev->netdev_ops = &gmac_351x_ops;
2493 netdev->ethtool_ops = &gmac_351x_ethtool_ops;
2494
2495 spin_lock_init(&port->config_lock);
2496 gmac_clear_hw_stats(netdev);
2497
2498 netdev->hw_features = GMAC_OFFLOAD_FEATURES;
2499 netdev->features |= GMAC_OFFLOAD_FEATURES | NETIF_F_GRO;
2500 /* We can receive jumbo frames up to 10236 bytes but only
2501 * transmit 2047 bytes so, let's accept payloads of 2047
2502 * bytes minus VLAN and ethernet header
2503 */
2504 netdev->min_mtu = ETH_MIN_MTU;
2505 netdev->max_mtu = MTU_SIZE_BIT_MASK - VLAN_ETH_HLEN;
2506
2507 port->freeq_refill = 0;
2508 netif_napi_add(netdev, &port->napi, gmac_napi_poll);
2509
2510 ret = of_get_mac_address(np, mac);
2511 if (!ret) {
2512 dev_info(dev, "Setting macaddr from DT %pM\n", mac);
2513 memcpy(port->mac_addr, mac, ETH_ALEN);
2514 }
2515
2516 if (is_valid_ether_addr((void *)port->mac_addr)) {
2517 eth_hw_addr_set(netdev, (u8 *)port->mac_addr);
2518 } else {
2519 dev_dbg(dev, "ethernet address 0x%08x%08x%08x invalid\n",
2520 port->mac_addr[0], port->mac_addr[1],
2521 port->mac_addr[2]);
2522 dev_info(dev, "using a random ethernet address\n");
2523 eth_hw_addr_random(netdev);
2524 }
2525 gmac_write_mac_address(netdev);
2526
2527 ret = devm_request_threaded_irq(port->dev,
2528 port->irq,
2529 gemini_port_irq,
2530 gemini_port_irq_thread,
2531 IRQF_SHARED,
2532 port_names[port->id],
2533 port);
2534 if (ret)
2535 goto unprepare;
2536
2537 ret = gmac_setup_phy(netdev);
2538 if (ret) {
2539 netdev_err(netdev,
2540 "PHY init failed\n");
2541 goto unprepare;
2542 }
2543
2544 ret = register_netdev(netdev);
2545 if (ret)
2546 goto unprepare;
2547
2548 return 0;
2549
2550 unprepare:
2551 clk_disable_unprepare(port->pclk);
2552 return ret;
2553 }
2554
2555 static void gemini_ethernet_port_remove(struct platform_device *pdev)
2556 {
2557 struct gemini_ethernet_port *port = platform_get_drvdata(pdev);
2558
2559 gemini_port_remove(port);
2560 }
2561
2562 static const struct of_device_id gemini_ethernet_port_of_match[] = {
2563 {
2564 .compatible = "cortina,gemini-ethernet-port",
2565 },
2566 {},
2567 };
2568 MODULE_DEVICE_TABLE(of, gemini_ethernet_port_of_match);
2569
2570 static struct platform_driver gemini_ethernet_port_driver = {
2571 .driver = {
2572 .name = "gemini-ethernet-port",
2573 .of_match_table = gemini_ethernet_port_of_match,
2574 },
2575 .probe = gemini_ethernet_port_probe,
2576 .remove = gemini_ethernet_port_remove,
2577 };
2578
2579 static int gemini_ethernet_probe(struct platform_device *pdev)
2580 {
2581 struct device *dev = &pdev->dev;
2582 struct gemini_ethernet *geth;
2583 unsigned int retry = 5;
2584 u32 val;
2585
2586 /* Global registers */
2587 geth = devm_kzalloc(dev, sizeof(*geth), GFP_KERNEL);
2588 if (!geth)
2589 return -ENOMEM;
2590 geth->base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
2591 if (IS_ERR(geth->base))
2592 return PTR_ERR(geth->base);
2593 geth->dev = dev;
2594
2595 /* Wait for ports to stabilize */
2596 do {
2597 udelay(2);
2598 val = readl(geth->base + GLOBAL_TOE_VERSION_REG);
2599 barrier();
2600 } while (!val && --retry);
2601 if (!retry) {
2602 dev_err(dev, "failed to reset ethernet\n");
2603 return -EIO;
2604 }
2605 dev_info(dev, "Ethernet device ID: 0x%03x, revision 0x%01x\n",
2606 (val >> 4) & 0xFFFU, val & 0xFU);
2607
2608 spin_lock_init(&geth->irq_lock);
2609 spin_lock_init(&geth->freeq_lock);
2610
2611 /* The children will use this */
2612 platform_set_drvdata(pdev, geth);
2613
2614 /* Spawn child devices for the two ports */
2615 return devm_of_platform_populate(dev);
2616 }
2617
2618 static void gemini_ethernet_remove(struct platform_device *pdev)
2619 {
2620 struct gemini_ethernet *geth = platform_get_drvdata(pdev);
2621
2622 geth_cleanup_freeq(geth);
2623 geth->initialized = false;
2624 }
2625
2626 static const struct of_device_id gemini_ethernet_of_match[] = {
2627 {
2628 .compatible = "cortina,gemini-ethernet",
2629 },
2630 {},
2631 };
2632 MODULE_DEVICE_TABLE(of, gemini_ethernet_of_match);
2633
2634 static struct platform_driver gemini_ethernet_driver = {
2635 .driver = {
2636 .name = DRV_NAME,
2637 .of_match_table = gemini_ethernet_of_match,
2638 },
2639 .probe = gemini_ethernet_probe,
2640 .remove = gemini_ethernet_remove,
2641 };
2642
2643 static int __init gemini_ethernet_module_init(void)
2644 {
2645 int ret;
2646
2647 ret = platform_driver_register(&gemini_ethernet_port_driver);
2648 if (ret)
2649 return ret;
2650
2651 ret = platform_driver_register(&gemini_ethernet_driver);
2652 if (ret) {
2653 platform_driver_unregister(&gemini_ethernet_port_driver);
2654 return ret;
2655 }
2656
2657 return 0;
2658 }
2659 module_init(gemini_ethernet_module_init);
2660
2661 static void __exit gemini_ethernet_module_exit(void)
2662 {
2663 platform_driver_unregister(&gemini_ethernet_driver);
2664 platform_driver_unregister(&gemini_ethernet_port_driver);
2665 }
2666 module_exit(gemini_ethernet_module_exit);
2667
2668 MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
2669 MODULE_DESCRIPTION("StorLink SL351x (Gemini) ethernet driver");
2670 MODULE_LICENSE("GPL");
2671 MODULE_ALIAS("platform:" DRV_NAME);
Kernel DRM miscellaneous fixes and cross-tree changes