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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#define DRV_VERSION "1.0"
48
49#define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK)
50static int debug = -1;
51module_param(debug, int, 0);
52MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
53
54#define HSIZE_8 0x00
55#define HSIZE_16 0x01
56#define HSIZE_32 0x02
57
58#define HBURST_SINGLE 0x00
59#define HBURST_INCR 0x01
60#define HBURST_INCR4 0x02
61#define HBURST_INCR8 0x03
62
63#define HPROT_DATA_CACHE BIT(0)
64#define HPROT_PRIVILIGED BIT(1)
65#define HPROT_BUFFERABLE BIT(2)
66#define HPROT_CACHABLE BIT(3)
67
68#define DEFAULT_RX_COALESCE_NSECS 0
69#define DEFAULT_GMAC_RXQ_ORDER 9
70#define DEFAULT_GMAC_TXQ_ORDER 8
71#define DEFAULT_RX_BUF_ORDER 11
72#define DEFAULT_NAPI_WEIGHT 64
73#define TX_MAX_FRAGS 16
74#define TX_QUEUE_NUM 1 /* max: 6 */
75#define RX_MAX_ALLOC_ORDER 2
76
77#define GMAC0_IRQ0_2 (GMAC0_TXDERR_INT_BIT | GMAC0_TXPERR_INT_BIT | \
78 GMAC0_RXDERR_INT_BIT | GMAC0_RXPERR_INT_BIT)
79#define GMAC0_IRQ0_TXQ0_INTS (GMAC0_SWTQ00_EOF_INT_BIT | \
80 GMAC0_SWTQ00_FIN_INT_BIT)
81#define GMAC0_IRQ4_8 (GMAC0_MIB_INT_BIT | GMAC0_RX_OVERRUN_INT_BIT)
82
83#define GMAC_OFFLOAD_FEATURES (NETIF_F_SG | NETIF_F_IP_CSUM | \
84 NETIF_F_IPV6_CSUM | NETIF_F_RXCSUM | \
85 NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6)
86
87/**
88 * struct gmac_queue_page - page buffer per-page info
89 */
90struct gmac_queue_page {
91 struct page *page;
92 dma_addr_t mapping;
93};
94
95struct gmac_txq {
96 struct gmac_txdesc *ring;
97 struct sk_buff **skb;
98 unsigned int cptr;
99 unsigned int noirq_packets;
100};
101
102struct gemini_ethernet;
103
104struct 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
149struct 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
170static 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
222static void gmac_dump_dma_state(struct net_device *netdev);
223
224static 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
240static 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
255static 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
272static 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
291static void gmac_speed_set(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 int pause_tx = 0;
297 int pause_rx = 0;
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 (phydev->interface == PHY_INTERFACE_MODE_RGMII)
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 (phydev->interface == PHY_INTERFACE_MODE_RGMII)
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 (phydev->interface == PHY_INTERFACE_MODE_RGMII)
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 u16 lcladv = phy_read(phydev, MII_ADVERTISE);
333 u16 rmtadv = phy_read(phydev, MII_LPA);
334 u8 cap = mii_resolve_flowctrl_fdx(lcladv, rmtadv);
335
336 if (cap & FLOW_CTRL_RX)
337 pause_rx = 1;
338 if (cap & FLOW_CTRL_TX)
339 pause_tx = 1;
340 }
341
342 gmac_set_flow_control(netdev, pause_tx, pause_rx);
343
344 if (old_status.bits32 == status.bits32)
345 return;
346
347 if (netif_msg_link(port)) {
348 phy_print_status(phydev);
349 netdev_info(netdev, "link flow control: %s\n",
350 phydev->pause
351 ? (phydev->asym_pause ? "tx" : "both")
352 : (phydev->asym_pause ? "rx" : "none")
353 );
354 }
355
356 gmac_disable_tx_rx(netdev);
357 writel(status.bits32, port->gmac_base + GMAC_STATUS);
358 gmac_enable_tx_rx(netdev);
359}
360
361static int gmac_setup_phy(struct net_device *netdev)
362{
363 struct gemini_ethernet_port *port = netdev_priv(netdev);
364 union gmac_status status = { .bits32 = 0 };
365 struct device *dev = port->dev;
366 struct phy_device *phy;
367
368 phy = of_phy_get_and_connect(netdev,
369 dev->of_node,
370 gmac_speed_set);
371 if (!phy)
372 return -ENODEV;
373 netdev->phydev = phy;
374
375 phy_set_max_speed(phy, SPEED_1000);
376 phy_support_asym_pause(phy);
377
378 /* set PHY interface type */
379 switch (phy->interface) {
380 case PHY_INTERFACE_MODE_MII:
381 netdev_dbg(netdev,
382 "MII: set GMAC0 to GMII mode, GMAC1 disabled\n");
383 status.bits.mii_rmii = GMAC_PHY_MII;
384 break;
385 case PHY_INTERFACE_MODE_GMII:
386 netdev_dbg(netdev,
387 "GMII: set GMAC0 to GMII mode, GMAC1 disabled\n");
388 status.bits.mii_rmii = GMAC_PHY_GMII;
389 break;
390 case PHY_INTERFACE_MODE_RGMII:
391 netdev_dbg(netdev,
392 "RGMII: set GMAC0 and GMAC1 to MII/RGMII mode\n");
393 status.bits.mii_rmii = GMAC_PHY_RGMII_100_10;
394 break;
395 default:
396 netdev_err(netdev, "Unsupported MII interface\n");
397 phy_disconnect(phy);
398 netdev->phydev = NULL;
399 return -EINVAL;
400 }
401 writel(status.bits32, port->gmac_base + GMAC_STATUS);
402
403 if (netif_msg_link(port))
404 phy_attached_info(phy);
405
406 return 0;
407}
408
409/* The maximum frame length is not logically enumerated in the
410 * hardware, so we do a table lookup to find the applicable max
411 * frame length.
412 */
413struct gmac_max_framelen {
414 unsigned int max_l3_len;
415 u8 val;
416};
417
418static const struct gmac_max_framelen gmac_maxlens[] = {
419 {
420 .max_l3_len = 1518,
421 .val = CONFIG0_MAXLEN_1518,
422 },
423 {
424 .max_l3_len = 1522,
425 .val = CONFIG0_MAXLEN_1522,
426 },
427 {
428 .max_l3_len = 1536,
429 .val = CONFIG0_MAXLEN_1536,
430 },
431 {
432 .max_l3_len = 1542,
433 .val = CONFIG0_MAXLEN_1542,
434 },
435 {
436 .max_l3_len = 9212,
437 .val = CONFIG0_MAXLEN_9k,
438 },
439 {
440 .max_l3_len = 10236,
441 .val = CONFIG0_MAXLEN_10k,
442 },
443};
444
445static int gmac_pick_rx_max_len(unsigned int max_l3_len)
446{
447 const struct gmac_max_framelen *maxlen;
448 int maxtot;
449 int i;
450
451 maxtot = max_l3_len + ETH_HLEN + VLAN_HLEN;
452
453 for (i = 0; i < ARRAY_SIZE(gmac_maxlens); i++) {
454 maxlen = &gmac_maxlens[i];
455 if (maxtot <= maxlen->max_l3_len)
456 return maxlen->val;
457 }
458
459 return -1;
460}
461
462static int gmac_init(struct net_device *netdev)
463{
464 struct gemini_ethernet_port *port = netdev_priv(netdev);
465 union gmac_config0 config0 = { .bits = {
466 .dis_tx = 1,
467 .dis_rx = 1,
468 .ipv4_rx_chksum = 1,
469 .ipv6_rx_chksum = 1,
470 .rx_err_detect = 1,
471 .rgmm_edge = 1,
472 .port0_chk_hwq = 1,
473 .port1_chk_hwq = 1,
474 .port0_chk_toeq = 1,
475 .port1_chk_toeq = 1,
476 .port0_chk_classq = 1,
477 .port1_chk_classq = 1,
478 } };
479 union gmac_ahb_weight ahb_weight = { .bits = {
480 .rx_weight = 1,
481 .tx_weight = 1,
482 .hash_weight = 1,
483 .pre_req = 0x1f,
484 .tq_dv_threshold = 0,
485 } };
486 union gmac_tx_wcr0 hw_weigh = { .bits = {
487 .hw_tq3 = 1,
488 .hw_tq2 = 1,
489 .hw_tq1 = 1,
490 .hw_tq0 = 1,
491 } };
492 union gmac_tx_wcr1 sw_weigh = { .bits = {
493 .sw_tq5 = 1,
494 .sw_tq4 = 1,
495 .sw_tq3 = 1,
496 .sw_tq2 = 1,
497 .sw_tq1 = 1,
498 .sw_tq0 = 1,
499 } };
500 union gmac_config1 config1 = { .bits = {
501 .set_threshold = 16,
502 .rel_threshold = 24,
503 } };
504 union gmac_config2 config2 = { .bits = {
505 .set_threshold = 16,
506 .rel_threshold = 32,
507 } };
508 union gmac_config3 config3 = { .bits = {
509 .set_threshold = 0,
510 .rel_threshold = 0,
511 } };
512 union gmac_config0 tmp;
513 u32 val;
514
515 config0.bits.max_len = gmac_pick_rx_max_len(netdev->mtu);
516 tmp.bits32 = readl(port->gmac_base + GMAC_CONFIG0);
517 config0.bits.reserved = tmp.bits.reserved;
518 writel(config0.bits32, port->gmac_base + GMAC_CONFIG0);
519 writel(config1.bits32, port->gmac_base + GMAC_CONFIG1);
520 writel(config2.bits32, port->gmac_base + GMAC_CONFIG2);
521 writel(config3.bits32, port->gmac_base + GMAC_CONFIG3);
522
523 val = readl(port->dma_base + GMAC_AHB_WEIGHT_REG);
524 writel(ahb_weight.bits32, port->dma_base + GMAC_AHB_WEIGHT_REG);
525
526 writel(hw_weigh.bits32,
527 port->dma_base + GMAC_TX_WEIGHTING_CTRL_0_REG);
528 writel(sw_weigh.bits32,
529 port->dma_base + GMAC_TX_WEIGHTING_CTRL_1_REG);
530
531 port->rxq_order = DEFAULT_GMAC_RXQ_ORDER;
532 port->txq_order = DEFAULT_GMAC_TXQ_ORDER;
533 port->rx_coalesce_nsecs = DEFAULT_RX_COALESCE_NSECS;
534
535 /* Mark every quarter of the queue a packet for interrupt
536 * in order to be able to wake up the queue if it was stopped
537 */
538 port->irq_every_tx_packets = 1 << (port->txq_order - 2);
539
540 return 0;
541}
542
543static void gmac_uninit(struct net_device *netdev)
544{
545 if (netdev->phydev)
546 phy_disconnect(netdev->phydev);
547}
548
549static int gmac_setup_txqs(struct net_device *netdev)
550{
551 struct gemini_ethernet_port *port = netdev_priv(netdev);
552 unsigned int n_txq = netdev->num_tx_queues;
553 struct gemini_ethernet *geth = port->geth;
554 size_t entries = 1 << port->txq_order;
555 struct gmac_txq *txq = port->txq;
556 struct gmac_txdesc *desc_ring;
557 size_t len = n_txq * entries;
558 struct sk_buff **skb_tab;
559 void __iomem *rwptr_reg;
560 unsigned int r;
561 int i;
562
563 rwptr_reg = port->dma_base + GMAC_SW_TX_QUEUE0_PTR_REG;
564
565 skb_tab = kcalloc(len, sizeof(*skb_tab), GFP_KERNEL);
566 if (!skb_tab)
567 return -ENOMEM;
568
569 desc_ring = dma_alloc_coherent(geth->dev, len * sizeof(*desc_ring),
570 &port->txq_dma_base, GFP_KERNEL);
571
572 if (!desc_ring) {
573 kfree(skb_tab);
574 return -ENOMEM;
575 }
576
577 if (port->txq_dma_base & ~DMA_Q_BASE_MASK) {
578 dev_warn(geth->dev, "TX queue base is not aligned\n");
579 kfree(skb_tab);
580 return -ENOMEM;
581 }
582
583 writel(port->txq_dma_base | port->txq_order,
584 port->dma_base + GMAC_SW_TX_QUEUE_BASE_REG);
585
586 for (i = 0; i < n_txq; i++) {
587 txq->ring = desc_ring;
588 txq->skb = skb_tab;
589 txq->noirq_packets = 0;
590
591 r = readw(rwptr_reg);
592 rwptr_reg += 2;
593 writew(r, rwptr_reg);
594 rwptr_reg += 2;
595 txq->cptr = r;
596
597 txq++;
598 desc_ring += entries;
599 skb_tab += entries;
600 }
601
602 return 0;
603}
604
605static void gmac_clean_txq(struct net_device *netdev, struct gmac_txq *txq,
606 unsigned int r)
607{
608 struct gemini_ethernet_port *port = netdev_priv(netdev);
609 unsigned int m = (1 << port->txq_order) - 1;
610 struct gemini_ethernet *geth = port->geth;
611 unsigned int c = txq->cptr;
612 union gmac_txdesc_0 word0;
613 union gmac_txdesc_1 word1;
614 unsigned int hwchksum = 0;
615 unsigned long bytes = 0;
616 struct gmac_txdesc *txd;
617 unsigned short nfrags;
618 unsigned int errs = 0;
619 unsigned int pkts = 0;
620 unsigned int word3;
621 dma_addr_t mapping;
622
623 if (c == r)
624 return;
625
626 while (c != r) {
627 txd = txq->ring + c;
628 word0 = txd->word0;
629 word1 = txd->word1;
630 mapping = txd->word2.buf_adr;
631 word3 = txd->word3.bits32;
632
633 dma_unmap_single(geth->dev, mapping,
634 word0.bits.buffer_size, DMA_TO_DEVICE);
635
636 if (word3 & EOF_BIT)
637 dev_kfree_skb(txq->skb[c]);
638
639 c++;
640 c &= m;
641
642 if (!(word3 & SOF_BIT))
643 continue;
644
645 if (!word0.bits.status_tx_ok) {
646 errs++;
647 continue;
648 }
649
650 pkts++;
651 bytes += txd->word1.bits.byte_count;
652
653 if (word1.bits32 & TSS_CHECKUM_ENABLE)
654 hwchksum++;
655
656 nfrags = word0.bits.desc_count - 1;
657 if (nfrags) {
658 if (nfrags >= TX_MAX_FRAGS)
659 nfrags = TX_MAX_FRAGS - 1;
660
661 u64_stats_update_begin(&port->tx_stats_syncp);
662 port->tx_frag_stats[nfrags]++;
663 u64_stats_update_end(&port->tx_stats_syncp);
664 }
665 }
666
667 u64_stats_update_begin(&port->ir_stats_syncp);
668 port->stats.tx_errors += errs;
669 port->stats.tx_packets += pkts;
670 port->stats.tx_bytes += bytes;
671 port->tx_hw_csummed += hwchksum;
672 u64_stats_update_end(&port->ir_stats_syncp);
673
674 txq->cptr = c;
675}
676
677static void gmac_cleanup_txqs(struct net_device *netdev)
678{
679 struct gemini_ethernet_port *port = netdev_priv(netdev);
680 unsigned int n_txq = netdev->num_tx_queues;
681 struct gemini_ethernet *geth = port->geth;
682 void __iomem *rwptr_reg;
683 unsigned int r, i;
684
685 rwptr_reg = port->dma_base + GMAC_SW_TX_QUEUE0_PTR_REG;
686
687 for (i = 0; i < n_txq; i++) {
688 r = readw(rwptr_reg);
689 rwptr_reg += 2;
690 writew(r, rwptr_reg);
691 rwptr_reg += 2;
692
693 gmac_clean_txq(netdev, port->txq + i, r);
694 }
695 writel(0, port->dma_base + GMAC_SW_TX_QUEUE_BASE_REG);
696
697 kfree(port->txq->skb);
698 dma_free_coherent(geth->dev,
699 n_txq * sizeof(*port->txq->ring) << port->txq_order,
700 port->txq->ring, port->txq_dma_base);
701}
702
703static int gmac_setup_rxq(struct net_device *netdev)
704{
705 struct gemini_ethernet_port *port = netdev_priv(netdev);
706 struct gemini_ethernet *geth = port->geth;
707 struct nontoe_qhdr __iomem *qhdr;
708
709 qhdr = geth->base + TOE_DEFAULT_Q_HDR_BASE(netdev->dev_id);
710 port->rxq_rwptr = &qhdr->word1;
711
712 /* Remap a slew of memory to use for the RX queue */
713 port->rxq_ring = dma_alloc_coherent(geth->dev,
714 sizeof(*port->rxq_ring) << port->rxq_order,
715 &port->rxq_dma_base, GFP_KERNEL);
716 if (!port->rxq_ring)
717 return -ENOMEM;
718 if (port->rxq_dma_base & ~NONTOE_QHDR0_BASE_MASK) {
719 dev_warn(geth->dev, "RX queue base is not aligned\n");
720 return -ENOMEM;
721 }
722
723 writel(port->rxq_dma_base | port->rxq_order, &qhdr->word0);
724 writel(0, port->rxq_rwptr);
725 return 0;
726}
727
728static struct gmac_queue_page *
729gmac_get_queue_page(struct gemini_ethernet *geth,
730 struct gemini_ethernet_port *port,
731 dma_addr_t addr)
732{
733 struct gmac_queue_page *gpage;
734 dma_addr_t mapping;
735 int i;
736
737 /* Only look for even pages */
738 mapping = addr & PAGE_MASK;
739
740 if (!geth->freeq_pages) {
741 dev_err(geth->dev, "try to get page with no page list\n");
742 return NULL;
743 }
744
745 /* Look up a ring buffer page from virtual mapping */
746 for (i = 0; i < geth->num_freeq_pages; i++) {
747 gpage = &geth->freeq_pages[i];
748 if (gpage->mapping == mapping)
749 return gpage;
750 }
751
752 return NULL;
753}
754
755static void gmac_cleanup_rxq(struct net_device *netdev)
756{
757 struct gemini_ethernet_port *port = netdev_priv(netdev);
758 struct gemini_ethernet *geth = port->geth;
759 struct gmac_rxdesc *rxd = port->rxq_ring;
760 static struct gmac_queue_page *gpage;
761 struct nontoe_qhdr __iomem *qhdr;
762 void __iomem *dma_reg;
763 void __iomem *ptr_reg;
764 dma_addr_t mapping;
765 union dma_rwptr rw;
766 unsigned int r, w;
767
768 qhdr = geth->base +
769 TOE_DEFAULT_Q_HDR_BASE(netdev->dev_id);
770 dma_reg = &qhdr->word0;
771 ptr_reg = &qhdr->word1;
772
773 rw.bits32 = readl(ptr_reg);
774 r = rw.bits.rptr;
775 w = rw.bits.wptr;
776 writew(r, ptr_reg + 2);
777
778 writel(0, dma_reg);
779
780 /* Loop from read pointer to write pointer of the RX queue
781 * and free up all pages by the queue.
782 */
783 while (r != w) {
784 mapping = rxd[r].word2.buf_adr;
785 r++;
786 r &= ((1 << port->rxq_order) - 1);
787
788 if (!mapping)
789 continue;
790
791 /* Freeq pointers are one page off */
792 gpage = gmac_get_queue_page(geth, port, mapping + PAGE_SIZE);
793 if (!gpage) {
794 dev_err(geth->dev, "could not find page\n");
795 continue;
796 }
797 /* Release the RX queue reference to the page */
798 put_page(gpage->page);
799 }
800
801 dma_free_coherent(geth->dev, sizeof(*port->rxq_ring) << port->rxq_order,
802 port->rxq_ring, port->rxq_dma_base);
803}
804
805static struct page *geth_freeq_alloc_map_page(struct gemini_ethernet *geth,
806 int pn)
807{
808 struct gmac_rxdesc *freeq_entry;
809 struct gmac_queue_page *gpage;
810 unsigned int fpp_order;
811 unsigned int frag_len;
812 dma_addr_t mapping;
813 struct page *page;
814 int i;
815
816 /* First allocate and DMA map a single page */
817 page = alloc_page(GFP_ATOMIC);
818 if (!page)
819 return NULL;
820
821 mapping = dma_map_single(geth->dev, page_address(page),
822 PAGE_SIZE, DMA_FROM_DEVICE);
823 if (dma_mapping_error(geth->dev, mapping)) {
824 put_page(page);
825 return NULL;
826 }
827
828 /* The assign the page mapping (physical address) to the buffer address
829 * in the hardware queue. PAGE_SHIFT on ARM is 12 (1 page is 4096 bytes,
830 * 4k), and the default RX frag order is 11 (fragments are up 20 2048
831 * bytes, 2k) so fpp_order (fragments per page order) is default 1. Thus
832 * each page normally needs two entries in the queue.
833 */
834 frag_len = 1 << geth->freeq_frag_order; /* Usually 2048 */
835 fpp_order = PAGE_SHIFT - geth->freeq_frag_order;
836 freeq_entry = geth->freeq_ring + (pn << fpp_order);
837 dev_dbg(geth->dev, "allocate page %d fragment length %d fragments per page %d, freeq entry %p\n",
838 pn, frag_len, (1 << fpp_order), freeq_entry);
839 for (i = (1 << fpp_order); i > 0; i--) {
840 freeq_entry->word2.buf_adr = mapping;
841 freeq_entry++;
842 mapping += frag_len;
843 }
844
845 /* If the freeq entry already has a page mapped, then unmap it. */
846 gpage = &geth->freeq_pages[pn];
847 if (gpage->page) {
848 mapping = geth->freeq_ring[pn << fpp_order].word2.buf_adr;
849 dma_unmap_single(geth->dev, mapping, frag_len, DMA_FROM_DEVICE);
850 /* This should be the last reference to the page so it gets
851 * released
852 */
853 put_page(gpage->page);
854 }
855
856 /* Then put our new mapping into the page table */
857 dev_dbg(geth->dev, "page %d, DMA addr: %08x, page %p\n",
858 pn, (unsigned int)mapping, page);
859 gpage->mapping = mapping;
860 gpage->page = page;
861
862 return page;
863}
864
865/**
866 * geth_fill_freeq() - Fill the freeq with empty fragments to use
867 * @geth: the ethernet adapter
868 * @refill: whether to reset the queue by filling in all freeq entries or
869 * just refill it, usually the interrupt to refill the queue happens when
870 * the queue is half empty.
871 */
872static unsigned int geth_fill_freeq(struct gemini_ethernet *geth, bool refill)
873{
874 unsigned int fpp_order = PAGE_SHIFT - geth->freeq_frag_order;
875 unsigned int count = 0;
876 unsigned int pn, epn;
877 unsigned long flags;
878 union dma_rwptr rw;
879 unsigned int m_pn;
880
881 /* Mask for page */
882 m_pn = (1 << (geth->freeq_order - fpp_order)) - 1;
883
884 spin_lock_irqsave(&geth->freeq_lock, flags);
885
886 rw.bits32 = readl(geth->base + GLOBAL_SWFQ_RWPTR_REG);
887 pn = (refill ? rw.bits.wptr : rw.bits.rptr) >> fpp_order;
888 epn = (rw.bits.rptr >> fpp_order) - 1;
889 epn &= m_pn;
890
891 /* Loop over the freeq ring buffer entries */
892 while (pn != epn) {
893 struct gmac_queue_page *gpage;
894 struct page *page;
895
896 gpage = &geth->freeq_pages[pn];
897 page = gpage->page;
898
899 dev_dbg(geth->dev, "fill entry %d page ref count %d add %d refs\n",
900 pn, page_ref_count(page), 1 << fpp_order);
901
902 if (page_ref_count(page) > 1) {
903 unsigned int fl = (pn - epn) & m_pn;
904
905 if (fl > 64 >> fpp_order)
906 break;
907
908 page = geth_freeq_alloc_map_page(geth, pn);
909 if (!page)
910 break;
911 }
912
913 /* Add one reference per fragment in the page */
914 page_ref_add(page, 1 << fpp_order);
915 count += 1 << fpp_order;
916 pn++;
917 pn &= m_pn;
918 }
919
920 writew(pn << fpp_order, geth->base + GLOBAL_SWFQ_RWPTR_REG + 2);
921
922 spin_unlock_irqrestore(&geth->freeq_lock, flags);
923
924 return count;
925}
926
927static int geth_setup_freeq(struct gemini_ethernet *geth)
928{
929 unsigned int fpp_order = PAGE_SHIFT - geth->freeq_frag_order;
930 unsigned int frag_len = 1 << geth->freeq_frag_order;
931 unsigned int len = 1 << geth->freeq_order;
932 unsigned int pages = len >> fpp_order;
933 union queue_threshold qt;
934 union dma_skb_size skbsz;
935 unsigned int filled;
936 unsigned int pn;
937
938 geth->freeq_ring = dma_alloc_coherent(geth->dev,
939 sizeof(*geth->freeq_ring) << geth->freeq_order,
940 &geth->freeq_dma_base, GFP_KERNEL);
941 if (!geth->freeq_ring)
942 return -ENOMEM;
943 if (geth->freeq_dma_base & ~DMA_Q_BASE_MASK) {
944 dev_warn(geth->dev, "queue ring base is not aligned\n");
945 goto err_freeq;
946 }
947
948 /* Allocate a mapping to page look-up index */
949 geth->freeq_pages = kcalloc(pages, sizeof(*geth->freeq_pages),
950 GFP_KERNEL);
951 if (!geth->freeq_pages)
952 goto err_freeq;
953 geth->num_freeq_pages = pages;
954
955 dev_info(geth->dev, "allocate %d pages for queue\n", pages);
956 for (pn = 0; pn < pages; pn++)
957 if (!geth_freeq_alloc_map_page(geth, pn))
958 goto err_freeq_alloc;
959
960 filled = geth_fill_freeq(geth, false);
961 if (!filled)
962 goto err_freeq_alloc;
963
964 qt.bits32 = readl(geth->base + GLOBAL_QUEUE_THRESHOLD_REG);
965 qt.bits.swfq_empty = 32;
966 writel(qt.bits32, geth->base + GLOBAL_QUEUE_THRESHOLD_REG);
967
968 skbsz.bits.sw_skb_size = 1 << geth->freeq_frag_order;
969 writel(skbsz.bits32, geth->base + GLOBAL_DMA_SKB_SIZE_REG);
970 writel(geth->freeq_dma_base | geth->freeq_order,
971 geth->base + GLOBAL_SW_FREEQ_BASE_SIZE_REG);
972
973 return 0;
974
975err_freeq_alloc:
976 while (pn > 0) {
977 struct gmac_queue_page *gpage;
978 dma_addr_t mapping;
979
980 --pn;
981 mapping = geth->freeq_ring[pn << fpp_order].word2.buf_adr;
982 dma_unmap_single(geth->dev, mapping, frag_len, DMA_FROM_DEVICE);
983 gpage = &geth->freeq_pages[pn];
984 put_page(gpage->page);
985 }
986
987 kfree(geth->freeq_pages);
988err_freeq:
989 dma_free_coherent(geth->dev,
990 sizeof(*geth->freeq_ring) << geth->freeq_order,
991 geth->freeq_ring, geth->freeq_dma_base);
992 geth->freeq_ring = NULL;
993 return -ENOMEM;
994}
995
996/**
997 * geth_cleanup_freeq() - cleanup the DMA mappings and free the queue
998 * @geth: the Gemini global ethernet state
999 */
1000static void geth_cleanup_freeq(struct gemini_ethernet *geth)
1001{
1002 unsigned int fpp_order = PAGE_SHIFT - geth->freeq_frag_order;
1003 unsigned int frag_len = 1 << geth->freeq_frag_order;
1004 unsigned int len = 1 << geth->freeq_order;
1005 unsigned int pages = len >> fpp_order;
1006 unsigned int pn;
1007
1008 writew(readw(geth->base + GLOBAL_SWFQ_RWPTR_REG),
1009 geth->base + GLOBAL_SWFQ_RWPTR_REG + 2);
1010 writel(0, geth->base + GLOBAL_SW_FREEQ_BASE_SIZE_REG);
1011
1012 for (pn = 0; pn < pages; pn++) {
1013 struct gmac_queue_page *gpage;
1014 dma_addr_t mapping;
1015
1016 mapping = geth->freeq_ring[pn << fpp_order].word2.buf_adr;
1017 dma_unmap_single(geth->dev, mapping, frag_len, DMA_FROM_DEVICE);
1018
1019 gpage = &geth->freeq_pages[pn];
1020 while (page_ref_count(gpage->page) > 0)
1021 put_page(gpage->page);
1022 }
1023
1024 kfree(geth->freeq_pages);
1025
1026 dma_free_coherent(geth->dev,
1027 sizeof(*geth->freeq_ring) << geth->freeq_order,
1028 geth->freeq_ring, geth->freeq_dma_base);
1029}
1030
1031/**
1032 * geth_resize_freeq() - resize the software queue depth
1033 * @port: the port requesting the change
1034 *
1035 * This gets called at least once during probe() so the device queue gets
1036 * "resized" from the hardware defaults. Since both ports/net devices share
1037 * the same hardware queue, some synchronization between the ports is
1038 * needed.
1039 */
1040static int geth_resize_freeq(struct gemini_ethernet_port *port)
1041{
1042 struct gemini_ethernet *geth = port->geth;
1043 struct net_device *netdev = port->netdev;
1044 struct gemini_ethernet_port *other_port;
1045 struct net_device *other_netdev;
1046 unsigned int new_size = 0;
1047 unsigned int new_order;
1048 unsigned long flags;
1049 u32 en;
1050 int ret;
1051
1052 if (netdev->dev_id == 0)
1053 other_netdev = geth->port1->netdev;
1054 else
1055 other_netdev = geth->port0->netdev;
1056
1057 if (other_netdev && netif_running(other_netdev))
1058 return -EBUSY;
1059
1060 new_size = 1 << (port->rxq_order + 1);
1061 netdev_dbg(netdev, "port %d size: %d order %d\n",
1062 netdev->dev_id,
1063 new_size,
1064 port->rxq_order);
1065 if (other_netdev) {
1066 other_port = netdev_priv(other_netdev);
1067 new_size += 1 << (other_port->rxq_order + 1);
1068 netdev_dbg(other_netdev, "port %d size: %d order %d\n",
1069 other_netdev->dev_id,
1070 (1 << (other_port->rxq_order + 1)),
1071 other_port->rxq_order);
1072 }
1073
1074 new_order = min(15, ilog2(new_size - 1) + 1);
1075 dev_dbg(geth->dev, "set shared queue to size %d order %d\n",
1076 new_size, new_order);
1077 if (geth->freeq_order == new_order)
1078 return 0;
1079
1080 spin_lock_irqsave(&geth->irq_lock, flags);
1081
1082 /* Disable the software queue IRQs */
1083 en = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
1084 en &= ~SWFQ_EMPTY_INT_BIT;
1085 writel(en, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
1086 spin_unlock_irqrestore(&geth->irq_lock, flags);
1087
1088 /* Drop the old queue */
1089 if (geth->freeq_ring)
1090 geth_cleanup_freeq(geth);
1091
1092 /* Allocate a new queue with the desired order */
1093 geth->freeq_order = new_order;
1094 ret = geth_setup_freeq(geth);
1095
1096 /* Restart the interrupts - NOTE if this is the first resize
1097 * after probe(), this is where the interrupts get turned on
1098 * in the first place.
1099 */
1100 spin_lock_irqsave(&geth->irq_lock, flags);
1101 en |= SWFQ_EMPTY_INT_BIT;
1102 writel(en, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
1103 spin_unlock_irqrestore(&geth->irq_lock, flags);
1104
1105 return ret;
1106}
1107
1108static void gmac_tx_irq_enable(struct net_device *netdev,
1109 unsigned int txq, int en)
1110{
1111 struct gemini_ethernet_port *port = netdev_priv(netdev);
1112 struct gemini_ethernet *geth = port->geth;
1113 u32 val, mask;
1114
1115 netdev_dbg(netdev, "%s device %d\n", __func__, netdev->dev_id);
1116
1117 mask = GMAC0_IRQ0_TXQ0_INTS << (6 * netdev->dev_id + txq);
1118
1119 if (en)
1120 writel(mask, geth->base + GLOBAL_INTERRUPT_STATUS_0_REG);
1121
1122 val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
1123 val = en ? val | mask : val & ~mask;
1124 writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
1125}
1126
1127static void gmac_tx_irq(struct net_device *netdev, unsigned int txq_num)
1128{
1129 struct netdev_queue *ntxq = netdev_get_tx_queue(netdev, txq_num);
1130
1131 gmac_tx_irq_enable(netdev, txq_num, 0);
1132 netif_tx_wake_queue(ntxq);
1133}
1134
1135static int gmac_map_tx_bufs(struct net_device *netdev, struct sk_buff *skb,
1136 struct gmac_txq *txq, unsigned short *desc)
1137{
1138 struct gemini_ethernet_port *port = netdev_priv(netdev);
1139 struct skb_shared_info *skb_si = skb_shinfo(skb);
1140 unsigned short m = (1 << port->txq_order) - 1;
1141 short frag, last_frag = skb_si->nr_frags - 1;
1142 struct gemini_ethernet *geth = port->geth;
1143 unsigned int word1, word3, buflen;
1144 unsigned short w = *desc;
1145 struct gmac_txdesc *txd;
1146 skb_frag_t *skb_frag;
1147 dma_addr_t mapping;
1148 unsigned short mtu;
1149 void *buffer;
1150
1151 mtu = ETH_HLEN;
1152 mtu += netdev->mtu;
1153 if (skb->protocol == htons(ETH_P_8021Q))
1154 mtu += VLAN_HLEN;
1155
1156 word1 = skb->len;
1157 word3 = SOF_BIT;
1158
1159 if (word1 > mtu) {
1160 word1 |= TSS_MTU_ENABLE_BIT;
1161 word3 |= mtu;
1162 }
1163
1164 if (skb->ip_summed != CHECKSUM_NONE) {
1165 int tcp = 0;
1166
1167 if (skb->protocol == htons(ETH_P_IP)) {
1168 word1 |= TSS_IP_CHKSUM_BIT;
1169 tcp = ip_hdr(skb)->protocol == IPPROTO_TCP;
1170 } else { /* IPv6 */
1171 word1 |= TSS_IPV6_ENABLE_BIT;
1172 tcp = ipv6_hdr(skb)->nexthdr == IPPROTO_TCP;
1173 }
1174
1175 word1 |= tcp ? TSS_TCP_CHKSUM_BIT : TSS_UDP_CHKSUM_BIT;
1176 }
1177
1178 frag = -1;
1179 while (frag <= last_frag) {
1180 if (frag == -1) {
1181 buffer = skb->data;
1182 buflen = skb_headlen(skb);
1183 } else {
1184 skb_frag = skb_si->frags + frag;
1185 buffer = skb_frag_address(skb_frag);
1186 buflen = skb_frag_size(skb_frag);
1187 }
1188
1189 if (frag == last_frag) {
1190 word3 |= EOF_BIT;
1191 txq->skb[w] = skb;
1192 }
1193
1194 mapping = dma_map_single(geth->dev, buffer, buflen,
1195 DMA_TO_DEVICE);
1196 if (dma_mapping_error(geth->dev, mapping))
1197 goto map_error;
1198
1199 txd = txq->ring + w;
1200 txd->word0.bits32 = buflen;
1201 txd->word1.bits32 = word1;
1202 txd->word2.buf_adr = mapping;
1203 txd->word3.bits32 = word3;
1204
1205 word3 &= MTU_SIZE_BIT_MASK;
1206 w++;
1207 w &= m;
1208 frag++;
1209 }
1210
1211 *desc = w;
1212 return 0;
1213
1214map_error:
1215 while (w != *desc) {
1216 w--;
1217 w &= m;
1218
1219 dma_unmap_page(geth->dev, txq->ring[w].word2.buf_adr,
1220 txq->ring[w].word0.bits.buffer_size,
1221 DMA_TO_DEVICE);
1222 }
1223 return -ENOMEM;
1224}
1225
1226static int gmac_start_xmit(struct sk_buff *skb, struct net_device *netdev)
1227{
1228 struct gemini_ethernet_port *port = netdev_priv(netdev);
1229 unsigned short m = (1 << port->txq_order) - 1;
1230 struct netdev_queue *ntxq;
1231 unsigned short r, w, d;
1232 void __iomem *ptr_reg;
1233 struct gmac_txq *txq;
1234 int txq_num, nfrags;
1235 union dma_rwptr rw;
1236
1237 if (skb->len >= 0x10000)
1238 goto out_drop_free;
1239
1240 txq_num = skb_get_queue_mapping(skb);
1241 ptr_reg = port->dma_base + GMAC_SW_TX_QUEUE_PTR_REG(txq_num);
1242 txq = &port->txq[txq_num];
1243 ntxq = netdev_get_tx_queue(netdev, txq_num);
1244 nfrags = skb_shinfo(skb)->nr_frags;
1245
1246 rw.bits32 = readl(ptr_reg);
1247 r = rw.bits.rptr;
1248 w = rw.bits.wptr;
1249
1250 d = txq->cptr - w - 1;
1251 d &= m;
1252
1253 if (d < nfrags + 2) {
1254 gmac_clean_txq(netdev, txq, r);
1255 d = txq->cptr - w - 1;
1256 d &= m;
1257
1258 if (d < nfrags + 2) {
1259 netif_tx_stop_queue(ntxq);
1260
1261 d = txq->cptr + nfrags + 16;
1262 d &= m;
1263 txq->ring[d].word3.bits.eofie = 1;
1264 gmac_tx_irq_enable(netdev, txq_num, 1);
1265
1266 u64_stats_update_begin(&port->tx_stats_syncp);
1267 netdev->stats.tx_fifo_errors++;
1268 u64_stats_update_end(&port->tx_stats_syncp);
1269 return NETDEV_TX_BUSY;
1270 }
1271 }
1272
1273 if (gmac_map_tx_bufs(netdev, skb, txq, &w)) {
1274 if (skb_linearize(skb))
1275 goto out_drop;
1276
1277 u64_stats_update_begin(&port->tx_stats_syncp);
1278 port->tx_frags_linearized++;
1279 u64_stats_update_end(&port->tx_stats_syncp);
1280
1281 if (gmac_map_tx_bufs(netdev, skb, txq, &w))
1282 goto out_drop_free;
1283 }
1284
1285 writew(w, ptr_reg + 2);
1286
1287 gmac_clean_txq(netdev, txq, r);
1288 return NETDEV_TX_OK;
1289
1290out_drop_free:
1291 dev_kfree_skb(skb);
1292out_drop:
1293 u64_stats_update_begin(&port->tx_stats_syncp);
1294 port->stats.tx_dropped++;
1295 u64_stats_update_end(&port->tx_stats_syncp);
1296 return NETDEV_TX_OK;
1297}
1298
1299static void gmac_tx_timeout(struct net_device *netdev)
1300{
1301 netdev_err(netdev, "Tx timeout\n");
1302 gmac_dump_dma_state(netdev);
1303}
1304
1305static void gmac_enable_irq(struct net_device *netdev, int enable)
1306{
1307 struct gemini_ethernet_port *port = netdev_priv(netdev);
1308 struct gemini_ethernet *geth = port->geth;
1309 unsigned long flags;
1310 u32 val, mask;
1311
1312 netdev_dbg(netdev, "%s device %d %s\n", __func__,
1313 netdev->dev_id, enable ? "enable" : "disable");
1314 spin_lock_irqsave(&geth->irq_lock, flags);
1315
1316 mask = GMAC0_IRQ0_2 << (netdev->dev_id * 2);
1317 val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
1318 val = enable ? (val | mask) : (val & ~mask);
1319 writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
1320
1321 mask = DEFAULT_Q0_INT_BIT << netdev->dev_id;
1322 val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG);
1323 val = enable ? (val | mask) : (val & ~mask);
1324 writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG);
1325
1326 mask = GMAC0_IRQ4_8 << (netdev->dev_id * 8);
1327 val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
1328 val = enable ? (val | mask) : (val & ~mask);
1329 writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
1330
1331 spin_unlock_irqrestore(&geth->irq_lock, flags);
1332}
1333
1334static void gmac_enable_rx_irq(struct net_device *netdev, int enable)
1335{
1336 struct gemini_ethernet_port *port = netdev_priv(netdev);
1337 struct gemini_ethernet *geth = port->geth;
1338 unsigned long flags;
1339 u32 val, mask;
1340
1341 netdev_dbg(netdev, "%s device %d %s\n", __func__, netdev->dev_id,
1342 enable ? "enable" : "disable");
1343 spin_lock_irqsave(&geth->irq_lock, flags);
1344 mask = DEFAULT_Q0_INT_BIT << netdev->dev_id;
1345
1346 val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG);
1347 val = enable ? (val | mask) : (val & ~mask);
1348 writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG);
1349
1350 spin_unlock_irqrestore(&geth->irq_lock, flags);
1351}
1352
1353static struct sk_buff *gmac_skb_if_good_frame(struct gemini_ethernet_port *port,
1354 union gmac_rxdesc_0 word0,
1355 unsigned int frame_len)
1356{
1357 unsigned int rx_csum = word0.bits.chksum_status;
1358 unsigned int rx_status = word0.bits.status;
1359 struct sk_buff *skb = NULL;
1360
1361 port->rx_stats[rx_status]++;
1362 port->rx_csum_stats[rx_csum]++;
1363
1364 if (word0.bits.derr || word0.bits.perr ||
1365 rx_status || frame_len < ETH_ZLEN ||
1366 rx_csum >= RX_CHKSUM_IP_ERR_UNKNOWN) {
1367 port->stats.rx_errors++;
1368
1369 if (frame_len < ETH_ZLEN || RX_ERROR_LENGTH(rx_status))
1370 port->stats.rx_length_errors++;
1371 if (RX_ERROR_OVER(rx_status))
1372 port->stats.rx_over_errors++;
1373 if (RX_ERROR_CRC(rx_status))
1374 port->stats.rx_crc_errors++;
1375 if (RX_ERROR_FRAME(rx_status))
1376 port->stats.rx_frame_errors++;
1377 return NULL;
1378 }
1379
1380 skb = napi_get_frags(&port->napi);
1381 if (!skb)
1382 goto update_exit;
1383
1384 if (rx_csum == RX_CHKSUM_IP_UDP_TCP_OK)
1385 skb->ip_summed = CHECKSUM_UNNECESSARY;
1386
1387update_exit:
1388 port->stats.rx_bytes += frame_len;
1389 port->stats.rx_packets++;
1390 return skb;
1391}
1392
1393static unsigned int gmac_rx(struct net_device *netdev, unsigned int budget)
1394{
1395 struct gemini_ethernet_port *port = netdev_priv(netdev);
1396 unsigned short m = (1 << port->rxq_order) - 1;
1397 struct gemini_ethernet *geth = port->geth;
1398 void __iomem *ptr_reg = port->rxq_rwptr;
1399 unsigned int frame_len, frag_len;
1400 struct gmac_rxdesc *rx = NULL;
1401 struct gmac_queue_page *gpage;
1402 static struct sk_buff *skb;
1403 union gmac_rxdesc_0 word0;
1404 union gmac_rxdesc_1 word1;
1405 union gmac_rxdesc_3 word3;
1406 struct page *page = NULL;
1407 unsigned int page_offs;
1408 unsigned short r, w;
1409 union dma_rwptr rw;
1410 dma_addr_t mapping;
1411 int frag_nr = 0;
1412
1413 rw.bits32 = readl(ptr_reg);
1414 /* Reset interrupt as all packages until here are taken into account */
1415 writel(DEFAULT_Q0_INT_BIT << netdev->dev_id,
1416 geth->base + GLOBAL_INTERRUPT_STATUS_1_REG);
1417 r = rw.bits.rptr;
1418 w = rw.bits.wptr;
1419
1420 while (budget && w != r) {
1421 rx = port->rxq_ring + r;
1422 word0 = rx->word0;
1423 word1 = rx->word1;
1424 mapping = rx->word2.buf_adr;
1425 word3 = rx->word3;
1426
1427 r++;
1428 r &= m;
1429
1430 frag_len = word0.bits.buffer_size;
1431 frame_len = word1.bits.byte_count;
1432 page_offs = mapping & ~PAGE_MASK;
1433
1434 if (!mapping) {
1435 netdev_err(netdev,
1436 "rxq[%u]: HW BUG: zero DMA desc\n", r);
1437 goto err_drop;
1438 }
1439
1440 /* Freeq pointers are one page off */
1441 gpage = gmac_get_queue_page(geth, port, mapping + PAGE_SIZE);
1442 if (!gpage) {
1443 dev_err(geth->dev, "could not find mapping\n");
1444 continue;
1445 }
1446 page = gpage->page;
1447
1448 if (word3.bits32 & SOF_BIT) {
1449 if (skb) {
1450 napi_free_frags(&port->napi);
1451 port->stats.rx_dropped++;
1452 }
1453
1454 skb = gmac_skb_if_good_frame(port, word0, frame_len);
1455 if (!skb)
1456 goto err_drop;
1457
1458 page_offs += NET_IP_ALIGN;
1459 frag_len -= NET_IP_ALIGN;
1460 frag_nr = 0;
1461
1462 } else if (!skb) {
1463 put_page(page);
1464 continue;
1465 }
1466
1467 if (word3.bits32 & EOF_BIT)
1468 frag_len = frame_len - skb->len;
1469
1470 /* append page frag to skb */
1471 if (frag_nr == MAX_SKB_FRAGS)
1472 goto err_drop;
1473
1474 if (frag_len == 0)
1475 netdev_err(netdev, "Received fragment with len = 0\n");
1476
1477 skb_fill_page_desc(skb, frag_nr, page, page_offs, frag_len);
1478 skb->len += frag_len;
1479 skb->data_len += frag_len;
1480 skb->truesize += frag_len;
1481 frag_nr++;
1482
1483 if (word3.bits32 & EOF_BIT) {
1484 napi_gro_frags(&port->napi);
1485 skb = NULL;
1486 --budget;
1487 }
1488 continue;
1489
1490err_drop:
1491 if (skb) {
1492 napi_free_frags(&port->napi);
1493 skb = NULL;
1494 }
1495
1496 if (mapping)
1497 put_page(page);
1498
1499 port->stats.rx_dropped++;
1500 }
1501
1502 writew(r, ptr_reg);
1503 return budget;
1504}
1505
1506static int gmac_napi_poll(struct napi_struct *napi, int budget)
1507{
1508 struct gemini_ethernet_port *port = netdev_priv(napi->dev);
1509 struct gemini_ethernet *geth = port->geth;
1510 unsigned int freeq_threshold;
1511 unsigned int received;
1512
1513 freeq_threshold = 1 << (geth->freeq_order - 1);
1514 u64_stats_update_begin(&port->rx_stats_syncp);
1515
1516 received = gmac_rx(napi->dev, budget);
1517 if (received < budget) {
1518 napi_gro_flush(napi, false);
1519 napi_complete_done(napi, received);
1520 gmac_enable_rx_irq(napi->dev, 1);
1521 ++port->rx_napi_exits;
1522 }
1523
1524 port->freeq_refill += (budget - received);
1525 if (port->freeq_refill > freeq_threshold) {
1526 port->freeq_refill -= freeq_threshold;
1527 geth_fill_freeq(geth, true);
1528 }
1529
1530 u64_stats_update_end(&port->rx_stats_syncp);
1531 return received;
1532}
1533
1534static void gmac_dump_dma_state(struct net_device *netdev)
1535{
1536 struct gemini_ethernet_port *port = netdev_priv(netdev);
1537 struct gemini_ethernet *geth = port->geth;
1538 void __iomem *ptr_reg;
1539 u32 reg[5];
1540
1541 /* Interrupt status */
1542 reg[0] = readl(geth->base + GLOBAL_INTERRUPT_STATUS_0_REG);
1543 reg[1] = readl(geth->base + GLOBAL_INTERRUPT_STATUS_1_REG);
1544 reg[2] = readl(geth->base + GLOBAL_INTERRUPT_STATUS_2_REG);
1545 reg[3] = readl(geth->base + GLOBAL_INTERRUPT_STATUS_3_REG);
1546 reg[4] = readl(geth->base + GLOBAL_INTERRUPT_STATUS_4_REG);
1547 netdev_err(netdev, "IRQ status: 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x\n",
1548 reg[0], reg[1], reg[2], reg[3], reg[4]);
1549
1550 /* Interrupt enable */
1551 reg[0] = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
1552 reg[1] = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG);
1553 reg[2] = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_2_REG);
1554 reg[3] = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_3_REG);
1555 reg[4] = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
1556 netdev_err(netdev, "IRQ enable: 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x\n",
1557 reg[0], reg[1], reg[2], reg[3], reg[4]);
1558
1559 /* RX DMA status */
1560 reg[0] = readl(port->dma_base + GMAC_DMA_RX_FIRST_DESC_REG);
1561 reg[1] = readl(port->dma_base + GMAC_DMA_RX_CURR_DESC_REG);
1562 reg[2] = GET_RPTR(port->rxq_rwptr);
1563 reg[3] = GET_WPTR(port->rxq_rwptr);
1564 netdev_err(netdev, "RX DMA regs: 0x%08x 0x%08x, ptr: %u %u\n",
1565 reg[0], reg[1], reg[2], reg[3]);
1566
1567 reg[0] = readl(port->dma_base + GMAC_DMA_RX_DESC_WORD0_REG);
1568 reg[1] = readl(port->dma_base + GMAC_DMA_RX_DESC_WORD1_REG);
1569 reg[2] = readl(port->dma_base + GMAC_DMA_RX_DESC_WORD2_REG);
1570 reg[3] = readl(port->dma_base + GMAC_DMA_RX_DESC_WORD3_REG);
1571 netdev_err(netdev, "RX DMA descriptor: 0x%08x 0x%08x 0x%08x 0x%08x\n",
1572 reg[0], reg[1], reg[2], reg[3]);
1573
1574 /* TX DMA status */
1575 ptr_reg = port->dma_base + GMAC_SW_TX_QUEUE0_PTR_REG;
1576
1577 reg[0] = readl(port->dma_base + GMAC_DMA_TX_FIRST_DESC_REG);
1578 reg[1] = readl(port->dma_base + GMAC_DMA_TX_CURR_DESC_REG);
1579 reg[2] = GET_RPTR(ptr_reg);
1580 reg[3] = GET_WPTR(ptr_reg);
1581 netdev_err(netdev, "TX DMA regs: 0x%08x 0x%08x, ptr: %u %u\n",
1582 reg[0], reg[1], reg[2], reg[3]);
1583
1584 reg[0] = readl(port->dma_base + GMAC_DMA_TX_DESC_WORD0_REG);
1585 reg[1] = readl(port->dma_base + GMAC_DMA_TX_DESC_WORD1_REG);
1586 reg[2] = readl(port->dma_base + GMAC_DMA_TX_DESC_WORD2_REG);
1587 reg[3] = readl(port->dma_base + GMAC_DMA_TX_DESC_WORD3_REG);
1588 netdev_err(netdev, "TX DMA descriptor: 0x%08x 0x%08x 0x%08x 0x%08x\n",
1589 reg[0], reg[1], reg[2], reg[3]);
1590
1591 /* FREE queues status */
1592 ptr_reg = geth->base + GLOBAL_SWFQ_RWPTR_REG;
1593
1594 reg[0] = GET_RPTR(ptr_reg);
1595 reg[1] = GET_WPTR(ptr_reg);
1596
1597 ptr_reg = geth->base + GLOBAL_HWFQ_RWPTR_REG;
1598
1599 reg[2] = GET_RPTR(ptr_reg);
1600 reg[3] = GET_WPTR(ptr_reg);
1601 netdev_err(netdev, "FQ SW ptr: %u %u, HW ptr: %u %u\n",
1602 reg[0], reg[1], reg[2], reg[3]);
1603}
1604
1605static void gmac_update_hw_stats(struct net_device *netdev)
1606{
1607 struct gemini_ethernet_port *port = netdev_priv(netdev);
1608 unsigned int rx_discards, rx_mcast, rx_bcast;
1609 struct gemini_ethernet *geth = port->geth;
1610 unsigned long flags;
1611
1612 spin_lock_irqsave(&geth->irq_lock, flags);
1613 u64_stats_update_begin(&port->ir_stats_syncp);
1614
1615 rx_discards = readl(port->gmac_base + GMAC_IN_DISCARDS);
1616 port->hw_stats[0] += rx_discards;
1617 port->hw_stats[1] += readl(port->gmac_base + GMAC_IN_ERRORS);
1618 rx_mcast = readl(port->gmac_base + GMAC_IN_MCAST);
1619 port->hw_stats[2] += rx_mcast;
1620 rx_bcast = readl(port->gmac_base + GMAC_IN_BCAST);
1621 port->hw_stats[3] += rx_bcast;
1622 port->hw_stats[4] += readl(port->gmac_base + GMAC_IN_MAC1);
1623 port->hw_stats[5] += readl(port->gmac_base + GMAC_IN_MAC2);
1624
1625 port->stats.rx_missed_errors += rx_discards;
1626 port->stats.multicast += rx_mcast;
1627 port->stats.multicast += rx_bcast;
1628
1629 writel(GMAC0_MIB_INT_BIT << (netdev->dev_id * 8),
1630 geth->base + GLOBAL_INTERRUPT_STATUS_4_REG);
1631
1632 u64_stats_update_end(&port->ir_stats_syncp);
1633 spin_unlock_irqrestore(&geth->irq_lock, flags);
1634}
1635
1636/**
1637 * gmac_get_intr_flags() - get interrupt status flags for a port from
1638 * @netdev: the net device for the port to get flags from
1639 * @i: the interrupt status register 0..4
1640 */
1641static u32 gmac_get_intr_flags(struct net_device *netdev, int i)
1642{
1643 struct gemini_ethernet_port *port = netdev_priv(netdev);
1644 struct gemini_ethernet *geth = port->geth;
1645 void __iomem *irqif_reg, *irqen_reg;
1646 unsigned int offs, val;
1647
1648 /* Calculate the offset using the stride of the status registers */
1649 offs = i * (GLOBAL_INTERRUPT_STATUS_1_REG -
1650 GLOBAL_INTERRUPT_STATUS_0_REG);
1651
1652 irqif_reg = geth->base + GLOBAL_INTERRUPT_STATUS_0_REG + offs;
1653 irqen_reg = geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG + offs;
1654
1655 val = readl(irqif_reg) & readl(irqen_reg);
1656 return val;
1657}
1658
1659static enum hrtimer_restart gmac_coalesce_delay_expired(struct hrtimer *timer)
1660{
1661 struct gemini_ethernet_port *port =
1662 container_of(timer, struct gemini_ethernet_port,
1663 rx_coalesce_timer);
1664
1665 napi_schedule(&port->napi);
1666 return HRTIMER_NORESTART;
1667}
1668
1669static irqreturn_t gmac_irq(int irq, void *data)
1670{
1671 struct gemini_ethernet_port *port;
1672 struct net_device *netdev = data;
1673 struct gemini_ethernet *geth;
1674 u32 val, orr = 0;
1675
1676 port = netdev_priv(netdev);
1677 geth = port->geth;
1678
1679 val = gmac_get_intr_flags(netdev, 0);
1680 orr |= val;
1681
1682 if (val & (GMAC0_IRQ0_2 << (netdev->dev_id * 2))) {
1683 /* Oh, crap */
1684 netdev_err(netdev, "hw failure/sw bug\n");
1685 gmac_dump_dma_state(netdev);
1686
1687 /* don't know how to recover, just reduce losses */
1688 gmac_enable_irq(netdev, 0);
1689 return IRQ_HANDLED;
1690 }
1691
1692 if (val & (GMAC0_IRQ0_TXQ0_INTS << (netdev->dev_id * 6)))
1693 gmac_tx_irq(netdev, 0);
1694
1695 val = gmac_get_intr_flags(netdev, 1);
1696 orr |= val;
1697
1698 if (val & (DEFAULT_Q0_INT_BIT << netdev->dev_id)) {
1699 gmac_enable_rx_irq(netdev, 0);
1700
1701 if (!port->rx_coalesce_nsecs) {
1702 napi_schedule(&port->napi);
1703 } else {
1704 ktime_t ktime;
1705
1706 ktime = ktime_set(0, port->rx_coalesce_nsecs);
1707 hrtimer_start(&port->rx_coalesce_timer, ktime,
1708 HRTIMER_MODE_REL);
1709 }
1710 }
1711
1712 val = gmac_get_intr_flags(netdev, 4);
1713 orr |= val;
1714
1715 if (val & (GMAC0_MIB_INT_BIT << (netdev->dev_id * 8)))
1716 gmac_update_hw_stats(netdev);
1717
1718 if (val & (GMAC0_RX_OVERRUN_INT_BIT << (netdev->dev_id * 8))) {
1719 writel(GMAC0_RXDERR_INT_BIT << (netdev->dev_id * 8),
1720 geth->base + GLOBAL_INTERRUPT_STATUS_4_REG);
1721
1722 spin_lock(&geth->irq_lock);
1723 u64_stats_update_begin(&port->ir_stats_syncp);
1724 ++port->stats.rx_fifo_errors;
1725 u64_stats_update_end(&port->ir_stats_syncp);
1726 spin_unlock(&geth->irq_lock);
1727 }
1728
1729 return orr ? IRQ_HANDLED : IRQ_NONE;
1730}
1731
1732static void gmac_start_dma(struct gemini_ethernet_port *port)
1733{
1734 void __iomem *dma_ctrl_reg = port->dma_base + GMAC_DMA_CTRL_REG;
1735 union gmac_dma_ctrl dma_ctrl;
1736
1737 dma_ctrl.bits32 = readl(dma_ctrl_reg);
1738 dma_ctrl.bits.rd_enable = 1;
1739 dma_ctrl.bits.td_enable = 1;
1740 dma_ctrl.bits.loopback = 0;
1741 dma_ctrl.bits.drop_small_ack = 0;
1742 dma_ctrl.bits.rd_insert_bytes = NET_IP_ALIGN;
1743 dma_ctrl.bits.rd_prot = HPROT_DATA_CACHE | HPROT_PRIVILIGED;
1744 dma_ctrl.bits.rd_burst_size = HBURST_INCR8;
1745 dma_ctrl.bits.rd_bus = HSIZE_8;
1746 dma_ctrl.bits.td_prot = HPROT_DATA_CACHE;
1747 dma_ctrl.bits.td_burst_size = HBURST_INCR8;
1748 dma_ctrl.bits.td_bus = HSIZE_8;
1749
1750 writel(dma_ctrl.bits32, dma_ctrl_reg);
1751}
1752
1753static void gmac_stop_dma(struct gemini_ethernet_port *port)
1754{
1755 void __iomem *dma_ctrl_reg = port->dma_base + GMAC_DMA_CTRL_REG;
1756 union gmac_dma_ctrl dma_ctrl;
1757
1758 dma_ctrl.bits32 = readl(dma_ctrl_reg);
1759 dma_ctrl.bits.rd_enable = 0;
1760 dma_ctrl.bits.td_enable = 0;
1761 writel(dma_ctrl.bits32, dma_ctrl_reg);
1762}
1763
1764static int gmac_open(struct net_device *netdev)
1765{
1766 struct gemini_ethernet_port *port = netdev_priv(netdev);
1767 int err;
1768
1769 if (!netdev->phydev) {
1770 err = gmac_setup_phy(netdev);
1771 if (err) {
1772 netif_err(port, ifup, netdev,
1773 "PHY init failed: %d\n", err);
1774 return err;
1775 }
1776 }
1777
1778 err = request_irq(netdev->irq, gmac_irq,
1779 IRQF_SHARED, netdev->name, netdev);
1780 if (err) {
1781 netdev_err(netdev, "no IRQ\n");
1782 return err;
1783 }
1784
1785 netif_carrier_off(netdev);
1786 phy_start(netdev->phydev);
1787
1788 err = geth_resize_freeq(port);
1789 /* It's fine if it's just busy, the other port has set up
1790 * the freeq in that case.
1791 */
1792 if (err && (err != -EBUSY)) {
1793 netdev_err(netdev, "could not resize freeq\n");
1794 goto err_stop_phy;
1795 }
1796
1797 err = gmac_setup_rxq(netdev);
1798 if (err) {
1799 netdev_err(netdev, "could not setup RXQ\n");
1800 goto err_stop_phy;
1801 }
1802
1803 err = gmac_setup_txqs(netdev);
1804 if (err) {
1805 netdev_err(netdev, "could not setup TXQs\n");
1806 gmac_cleanup_rxq(netdev);
1807 goto err_stop_phy;
1808 }
1809
1810 napi_enable(&port->napi);
1811
1812 gmac_start_dma(port);
1813 gmac_enable_irq(netdev, 1);
1814 gmac_enable_tx_rx(netdev);
1815 netif_tx_start_all_queues(netdev);
1816
1817 hrtimer_init(&port->rx_coalesce_timer, CLOCK_MONOTONIC,
1818 HRTIMER_MODE_REL);
1819 port->rx_coalesce_timer.function = &gmac_coalesce_delay_expired;
1820
1821 netdev_dbg(netdev, "opened\n");
1822
1823 return 0;
1824
1825err_stop_phy:
1826 phy_stop(netdev->phydev);
1827 free_irq(netdev->irq, netdev);
1828 return err;
1829}
1830
1831static int gmac_stop(struct net_device *netdev)
1832{
1833 struct gemini_ethernet_port *port = netdev_priv(netdev);
1834
1835 hrtimer_cancel(&port->rx_coalesce_timer);
1836 netif_tx_stop_all_queues(netdev);
1837 gmac_disable_tx_rx(netdev);
1838 gmac_stop_dma(port);
1839 napi_disable(&port->napi);
1840
1841 gmac_enable_irq(netdev, 0);
1842 gmac_cleanup_rxq(netdev);
1843 gmac_cleanup_txqs(netdev);
1844
1845 phy_stop(netdev->phydev);
1846 free_irq(netdev->irq, netdev);
1847
1848 gmac_update_hw_stats(netdev);
1849 return 0;
1850}
1851
1852static void gmac_set_rx_mode(struct net_device *netdev)
1853{
1854 struct gemini_ethernet_port *port = netdev_priv(netdev);
1855 union gmac_rx_fltr filter = { .bits = {
1856 .broadcast = 1,
1857 .multicast = 1,
1858 .unicast = 1,
1859 } };
1860 struct netdev_hw_addr *ha;
1861 unsigned int bit_nr;
1862 u32 mc_filter[2];
1863
1864 mc_filter[1] = 0;
1865 mc_filter[0] = 0;
1866
1867 if (netdev->flags & IFF_PROMISC) {
1868 filter.bits.error = 1;
1869 filter.bits.promiscuous = 1;
1870 mc_filter[1] = ~0;
1871 mc_filter[0] = ~0;
1872 } else if (netdev->flags & IFF_ALLMULTI) {
1873 mc_filter[1] = ~0;
1874 mc_filter[0] = ~0;
1875 } else {
1876 netdev_for_each_mc_addr(ha, netdev) {
1877 bit_nr = ~crc32_le(~0, ha->addr, ETH_ALEN) & 0x3f;
1878 mc_filter[bit_nr >> 5] |= 1 << (bit_nr & 0x1f);
1879 }
1880 }
1881
1882 writel(mc_filter[0], port->gmac_base + GMAC_MCAST_FIL0);
1883 writel(mc_filter[1], port->gmac_base + GMAC_MCAST_FIL1);
1884 writel(filter.bits32, port->gmac_base + GMAC_RX_FLTR);
1885}
1886
1887static void gmac_write_mac_address(struct net_device *netdev)
1888{
1889 struct gemini_ethernet_port *port = netdev_priv(netdev);
1890 __le32 addr[3];
1891
1892 memset(addr, 0, sizeof(addr));
1893 memcpy(addr, netdev->dev_addr, ETH_ALEN);
1894
1895 writel(le32_to_cpu(addr[0]), port->gmac_base + GMAC_STA_ADD0);
1896 writel(le32_to_cpu(addr[1]), port->gmac_base + GMAC_STA_ADD1);
1897 writel(le32_to_cpu(addr[2]), port->gmac_base + GMAC_STA_ADD2);
1898}
1899
1900static int gmac_set_mac_address(struct net_device *netdev, void *addr)
1901{
1902 struct sockaddr *sa = addr;
1903
1904 memcpy(netdev->dev_addr, sa->sa_data, ETH_ALEN);
1905 gmac_write_mac_address(netdev);
1906
1907 return 0;
1908}
1909
1910static void gmac_clear_hw_stats(struct net_device *netdev)
1911{
1912 struct gemini_ethernet_port *port = netdev_priv(netdev);
1913
1914 readl(port->gmac_base + GMAC_IN_DISCARDS);
1915 readl(port->gmac_base + GMAC_IN_ERRORS);
1916 readl(port->gmac_base + GMAC_IN_MCAST);
1917 readl(port->gmac_base + GMAC_IN_BCAST);
1918 readl(port->gmac_base + GMAC_IN_MAC1);
1919 readl(port->gmac_base + GMAC_IN_MAC2);
1920}
1921
1922static void gmac_get_stats64(struct net_device *netdev,
1923 struct rtnl_link_stats64 *stats)
1924{
1925 struct gemini_ethernet_port *port = netdev_priv(netdev);
1926 unsigned int start;
1927
1928 gmac_update_hw_stats(netdev);
1929
1930 /* Racing with RX NAPI */
1931 do {
1932 start = u64_stats_fetch_begin(&port->rx_stats_syncp);
1933
1934 stats->rx_packets = port->stats.rx_packets;
1935 stats->rx_bytes = port->stats.rx_bytes;
1936 stats->rx_errors = port->stats.rx_errors;
1937 stats->rx_dropped = port->stats.rx_dropped;
1938
1939 stats->rx_length_errors = port->stats.rx_length_errors;
1940 stats->rx_over_errors = port->stats.rx_over_errors;
1941 stats->rx_crc_errors = port->stats.rx_crc_errors;
1942 stats->rx_frame_errors = port->stats.rx_frame_errors;
1943
1944 } while (u64_stats_fetch_retry(&port->rx_stats_syncp, start));
1945
1946 /* Racing with MIB and TX completion interrupts */
1947 do {
1948 start = u64_stats_fetch_begin(&port->ir_stats_syncp);
1949
1950 stats->tx_errors = port->stats.tx_errors;
1951 stats->tx_packets = port->stats.tx_packets;
1952 stats->tx_bytes = port->stats.tx_bytes;
1953
1954 stats->multicast = port->stats.multicast;
1955 stats->rx_missed_errors = port->stats.rx_missed_errors;
1956 stats->rx_fifo_errors = port->stats.rx_fifo_errors;
1957
1958 } while (u64_stats_fetch_retry(&port->ir_stats_syncp, start));
1959
1960 /* Racing with hard_start_xmit */
1961 do {
1962 start = u64_stats_fetch_begin(&port->tx_stats_syncp);
1963
1964 stats->tx_dropped = port->stats.tx_dropped;
1965
1966 } while (u64_stats_fetch_retry(&port->tx_stats_syncp, start));
1967
1968 stats->rx_dropped += stats->rx_missed_errors;
1969}
1970
1971static int gmac_change_mtu(struct net_device *netdev, int new_mtu)
1972{
1973 int max_len = gmac_pick_rx_max_len(new_mtu);
1974
1975 if (max_len < 0)
1976 return -EINVAL;
1977
1978 gmac_disable_tx_rx(netdev);
1979
1980 netdev->mtu = new_mtu;
1981 gmac_update_config0_reg(netdev, max_len << CONFIG0_MAXLEN_SHIFT,
1982 CONFIG0_MAXLEN_MASK);
1983
1984 netdev_update_features(netdev);
1985
1986 gmac_enable_tx_rx(netdev);
1987
1988 return 0;
1989}
1990
1991static netdev_features_t gmac_fix_features(struct net_device *netdev,
1992 netdev_features_t features)
1993{
1994 if (netdev->mtu + ETH_HLEN + VLAN_HLEN > MTU_SIZE_BIT_MASK)
1995 features &= ~GMAC_OFFLOAD_FEATURES;
1996
1997 return features;
1998}
1999
2000static int gmac_set_features(struct net_device *netdev,
2001 netdev_features_t features)
2002{
2003 struct gemini_ethernet_port *port = netdev_priv(netdev);
2004 int enable = features & NETIF_F_RXCSUM;
2005 unsigned long flags;
2006 u32 reg;
2007
2008 spin_lock_irqsave(&port->config_lock, flags);
2009
2010 reg = readl(port->gmac_base + GMAC_CONFIG0);
2011 reg = enable ? reg | CONFIG0_RX_CHKSUM : reg & ~CONFIG0_RX_CHKSUM;
2012 writel(reg, port->gmac_base + GMAC_CONFIG0);
2013
2014 spin_unlock_irqrestore(&port->config_lock, flags);
2015 return 0;
2016}
2017
2018static int gmac_get_sset_count(struct net_device *netdev, int sset)
2019{
2020 return sset == ETH_SS_STATS ? GMAC_STATS_NUM : 0;
2021}
2022
2023static void gmac_get_strings(struct net_device *netdev, u32 stringset, u8 *data)
2024{
2025 if (stringset != ETH_SS_STATS)
2026 return;
2027
2028 memcpy(data, gmac_stats_strings, sizeof(gmac_stats_strings));
2029}
2030
2031static void gmac_get_ethtool_stats(struct net_device *netdev,
2032 struct ethtool_stats *estats, u64 *values)
2033{
2034 struct gemini_ethernet_port *port = netdev_priv(netdev);
2035 unsigned int start;
2036 u64 *p;
2037 int i;
2038
2039 gmac_update_hw_stats(netdev);
2040
2041 /* Racing with MIB interrupt */
2042 do {
2043 p = values;
2044 start = u64_stats_fetch_begin(&port->ir_stats_syncp);
2045
2046 for (i = 0; i < RX_STATS_NUM; i++)
2047 *p++ = port->hw_stats[i];
2048
2049 } while (u64_stats_fetch_retry(&port->ir_stats_syncp, start));
2050 values = p;
2051
2052 /* Racing with RX NAPI */
2053 do {
2054 p = values;
2055 start = u64_stats_fetch_begin(&port->rx_stats_syncp);
2056
2057 for (i = 0; i < RX_STATUS_NUM; i++)
2058 *p++ = port->rx_stats[i];
2059 for (i = 0; i < RX_CHKSUM_NUM; i++)
2060 *p++ = port->rx_csum_stats[i];
2061 *p++ = port->rx_napi_exits;
2062
2063 } while (u64_stats_fetch_retry(&port->rx_stats_syncp, start));
2064 values = p;
2065
2066 /* Racing with TX start_xmit */
2067 do {
2068 p = values;
2069 start = u64_stats_fetch_begin(&port->tx_stats_syncp);
2070
2071 for (i = 0; i < TX_MAX_FRAGS; i++) {
2072 *values++ = port->tx_frag_stats[i];
2073 port->tx_frag_stats[i] = 0;
2074 }
2075 *values++ = port->tx_frags_linearized;
2076 *values++ = port->tx_hw_csummed;
2077
2078 } while (u64_stats_fetch_retry(&port->tx_stats_syncp, start));
2079}
2080
2081static int gmac_get_ksettings(struct net_device *netdev,
2082 struct ethtool_link_ksettings *cmd)
2083{
2084 if (!netdev->phydev)
2085 return -ENXIO;
2086 phy_ethtool_ksettings_get(netdev->phydev, cmd);
2087
2088 return 0;
2089}
2090
2091static int gmac_set_ksettings(struct net_device *netdev,
2092 const struct ethtool_link_ksettings *cmd)
2093{
2094 if (!netdev->phydev)
2095 return -ENXIO;
2096 return phy_ethtool_ksettings_set(netdev->phydev, cmd);
2097}
2098
2099static int gmac_nway_reset(struct net_device *netdev)
2100{
2101 if (!netdev->phydev)
2102 return -ENXIO;
2103 return phy_start_aneg(netdev->phydev);
2104}
2105
2106static void gmac_get_pauseparam(struct net_device *netdev,
2107 struct ethtool_pauseparam *pparam)
2108{
2109 struct gemini_ethernet_port *port = netdev_priv(netdev);
2110 union gmac_config0 config0;
2111
2112 config0.bits32 = readl(port->gmac_base + GMAC_CONFIG0);
2113
2114 pparam->rx_pause = config0.bits.rx_fc_en;
2115 pparam->tx_pause = config0.bits.tx_fc_en;
2116 pparam->autoneg = true;
2117}
2118
2119static void gmac_get_ringparam(struct net_device *netdev,
2120 struct ethtool_ringparam *rp)
2121{
2122 struct gemini_ethernet_port *port = netdev_priv(netdev);
2123 union gmac_config0 config0;
2124
2125 config0.bits32 = readl(port->gmac_base + GMAC_CONFIG0);
2126
2127 rp->rx_max_pending = 1 << 15;
2128 rp->rx_mini_max_pending = 0;
2129 rp->rx_jumbo_max_pending = 0;
2130 rp->tx_max_pending = 1 << 15;
2131
2132 rp->rx_pending = 1 << port->rxq_order;
2133 rp->rx_mini_pending = 0;
2134 rp->rx_jumbo_pending = 0;
2135 rp->tx_pending = 1 << port->txq_order;
2136}
2137
2138static int gmac_set_ringparam(struct net_device *netdev,
2139 struct ethtool_ringparam *rp)
2140{
2141 struct gemini_ethernet_port *port = netdev_priv(netdev);
2142 int err = 0;
2143
2144 if (netif_running(netdev))
2145 return -EBUSY;
2146
2147 if (rp->rx_pending) {
2148 port->rxq_order = min(15, ilog2(rp->rx_pending - 1) + 1);
2149 err = geth_resize_freeq(port);
2150 }
2151 if (rp->tx_pending) {
2152 port->txq_order = min(15, ilog2(rp->tx_pending - 1) + 1);
2153 port->irq_every_tx_packets = 1 << (port->txq_order - 2);
2154 }
2155
2156 return err;
2157}
2158
2159static int gmac_get_coalesce(struct net_device *netdev,
2160 struct ethtool_coalesce *ecmd)
2161{
2162 struct gemini_ethernet_port *port = netdev_priv(netdev);
2163
2164 ecmd->rx_max_coalesced_frames = 1;
2165 ecmd->tx_max_coalesced_frames = port->irq_every_tx_packets;
2166 ecmd->rx_coalesce_usecs = port->rx_coalesce_nsecs / 1000;
2167
2168 return 0;
2169}
2170
2171static int gmac_set_coalesce(struct net_device *netdev,
2172 struct ethtool_coalesce *ecmd)
2173{
2174 struct gemini_ethernet_port *port = netdev_priv(netdev);
2175
2176 if (ecmd->tx_max_coalesced_frames < 1)
2177 return -EINVAL;
2178 if (ecmd->tx_max_coalesced_frames >= 1 << port->txq_order)
2179 return -EINVAL;
2180
2181 port->irq_every_tx_packets = ecmd->tx_max_coalesced_frames;
2182 port->rx_coalesce_nsecs = ecmd->rx_coalesce_usecs * 1000;
2183
2184 return 0;
2185}
2186
2187static u32 gmac_get_msglevel(struct net_device *netdev)
2188{
2189 struct gemini_ethernet_port *port = netdev_priv(netdev);
2190
2191 return port->msg_enable;
2192}
2193
2194static void gmac_set_msglevel(struct net_device *netdev, u32 level)
2195{
2196 struct gemini_ethernet_port *port = netdev_priv(netdev);
2197
2198 port->msg_enable = level;
2199}
2200
2201static void gmac_get_drvinfo(struct net_device *netdev,
2202 struct ethtool_drvinfo *info)
2203{
2204 strcpy(info->driver, DRV_NAME);
2205 strcpy(info->version, DRV_VERSION);
2206 strcpy(info->bus_info, netdev->dev_id ? "1" : "0");
2207}
2208
2209static const struct net_device_ops gmac_351x_ops = {
2210 .ndo_init = gmac_init,
2211 .ndo_uninit = gmac_uninit,
2212 .ndo_open = gmac_open,
2213 .ndo_stop = gmac_stop,
2214 .ndo_start_xmit = gmac_start_xmit,
2215 .ndo_tx_timeout = gmac_tx_timeout,
2216 .ndo_set_rx_mode = gmac_set_rx_mode,
2217 .ndo_set_mac_address = gmac_set_mac_address,
2218 .ndo_get_stats64 = gmac_get_stats64,
2219 .ndo_change_mtu = gmac_change_mtu,
2220 .ndo_fix_features = gmac_fix_features,
2221 .ndo_set_features = gmac_set_features,
2222};
2223
2224static const struct ethtool_ops gmac_351x_ethtool_ops = {
2225 .get_sset_count = gmac_get_sset_count,
2226 .get_strings = gmac_get_strings,
2227 .get_ethtool_stats = gmac_get_ethtool_stats,
2228 .get_link = ethtool_op_get_link,
2229 .get_link_ksettings = gmac_get_ksettings,
2230 .set_link_ksettings = gmac_set_ksettings,
2231 .nway_reset = gmac_nway_reset,
2232 .get_pauseparam = gmac_get_pauseparam,
2233 .get_ringparam = gmac_get_ringparam,
2234 .set_ringparam = gmac_set_ringparam,
2235 .get_coalesce = gmac_get_coalesce,
2236 .set_coalesce = gmac_set_coalesce,
2237 .get_msglevel = gmac_get_msglevel,
2238 .set_msglevel = gmac_set_msglevel,
2239 .get_drvinfo = gmac_get_drvinfo,
2240};
2241
2242static irqreturn_t gemini_port_irq_thread(int irq, void *data)
2243{
2244 unsigned long irqmask = SWFQ_EMPTY_INT_BIT;
2245 struct gemini_ethernet_port *port = data;
2246 struct gemini_ethernet *geth;
2247 unsigned long flags;
2248
2249 geth = port->geth;
2250 /* The queue is half empty so refill it */
2251 geth_fill_freeq(geth, true);
2252
2253 spin_lock_irqsave(&geth->irq_lock, flags);
2254 /* ACK queue interrupt */
2255 writel(irqmask, geth->base + GLOBAL_INTERRUPT_STATUS_4_REG);
2256 /* Enable queue interrupt again */
2257 irqmask |= readl(geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
2258 writel(irqmask, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
2259 spin_unlock_irqrestore(&geth->irq_lock, flags);
2260
2261 return IRQ_HANDLED;
2262}
2263
2264static irqreturn_t gemini_port_irq(int irq, void *data)
2265{
2266 struct gemini_ethernet_port *port = data;
2267 struct gemini_ethernet *geth;
2268 irqreturn_t ret = IRQ_NONE;
2269 u32 val, en;
2270
2271 geth = port->geth;
2272 spin_lock(&geth->irq_lock);
2273
2274 val = readl(geth->base + GLOBAL_INTERRUPT_STATUS_4_REG);
2275 en = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
2276
2277 if (val & en & SWFQ_EMPTY_INT_BIT) {
2278 /* Disable the queue empty interrupt while we work on
2279 * processing the queue. Also disable overrun interrupts
2280 * as there is not much we can do about it here.
2281 */
2282 en &= ~(SWFQ_EMPTY_INT_BIT | GMAC0_RX_OVERRUN_INT_BIT
2283 | GMAC1_RX_OVERRUN_INT_BIT);
2284 writel(en, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
2285 ret = IRQ_WAKE_THREAD;
2286 }
2287
2288 spin_unlock(&geth->irq_lock);
2289
2290 return ret;
2291}
2292
2293static void gemini_port_remove(struct gemini_ethernet_port *port)
2294{
2295 if (port->netdev)
2296 unregister_netdev(port->netdev);
2297 clk_disable_unprepare(port->pclk);
2298 geth_cleanup_freeq(port->geth);
2299}
2300
2301static void gemini_ethernet_init(struct gemini_ethernet *geth)
2302{
2303 /* Only do this once both ports are online */
2304 if (geth->initialized)
2305 return;
2306 if (geth->port0 && geth->port1)
2307 geth->initialized = true;
2308 else
2309 return;
2310
2311 writel(0, geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
2312 writel(0, geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG);
2313 writel(0, geth->base + GLOBAL_INTERRUPT_ENABLE_2_REG);
2314 writel(0, geth->base + GLOBAL_INTERRUPT_ENABLE_3_REG);
2315 writel(0, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
2316
2317 /* Interrupt config:
2318 *
2319 * GMAC0 intr bits ------> int0 ----> eth0
2320 * GMAC1 intr bits ------> int1 ----> eth1
2321 * TOE intr -------------> int1 ----> eth1
2322 * Classification Intr --> int0 ----> eth0
2323 * Default Q0 -----------> int0 ----> eth0
2324 * Default Q1 -----------> int1 ----> eth1
2325 * FreeQ intr -----------> int1 ----> eth1
2326 */
2327 writel(0xCCFC0FC0, geth->base + GLOBAL_INTERRUPT_SELECT_0_REG);
2328 writel(0x00F00002, geth->base + GLOBAL_INTERRUPT_SELECT_1_REG);
2329 writel(0xFFFFFFFF, geth->base + GLOBAL_INTERRUPT_SELECT_2_REG);
2330 writel(0xFFFFFFFF, geth->base + GLOBAL_INTERRUPT_SELECT_3_REG);
2331 writel(0xFF000003, geth->base + GLOBAL_INTERRUPT_SELECT_4_REG);
2332
2333 /* edge-triggered interrupts packed to level-triggered one... */
2334 writel(~0, geth->base + GLOBAL_INTERRUPT_STATUS_0_REG);
2335 writel(~0, geth->base + GLOBAL_INTERRUPT_STATUS_1_REG);
2336 writel(~0, geth->base + GLOBAL_INTERRUPT_STATUS_2_REG);
2337 writel(~0, geth->base + GLOBAL_INTERRUPT_STATUS_3_REG);
2338 writel(~0, geth->base + GLOBAL_INTERRUPT_STATUS_4_REG);
2339
2340 /* Set up queue */
2341 writel(0, geth->base + GLOBAL_SW_FREEQ_BASE_SIZE_REG);
2342 writel(0, geth->base + GLOBAL_HW_FREEQ_BASE_SIZE_REG);
2343 writel(0, geth->base + GLOBAL_SWFQ_RWPTR_REG);
2344 writel(0, geth->base + GLOBAL_HWFQ_RWPTR_REG);
2345
2346 geth->freeq_frag_order = DEFAULT_RX_BUF_ORDER;
2347 /* This makes the queue resize on probe() so that we
2348 * set up and enable the queue IRQ. FIXME: fragile.
2349 */
2350 geth->freeq_order = 1;
2351}
2352
2353static void gemini_port_save_mac_addr(struct gemini_ethernet_port *port)
2354{
2355 port->mac_addr[0] =
2356 cpu_to_le32(readl(port->gmac_base + GMAC_STA_ADD0));
2357 port->mac_addr[1] =
2358 cpu_to_le32(readl(port->gmac_base + GMAC_STA_ADD1));
2359 port->mac_addr[2] =
2360 cpu_to_le32(readl(port->gmac_base + GMAC_STA_ADD2));
2361}
2362
2363static int gemini_ethernet_port_probe(struct platform_device *pdev)
2364{
2365 char *port_names[2] = { "ethernet0", "ethernet1" };
2366 struct gemini_ethernet_port *port;
2367 struct device *dev = &pdev->dev;
2368 struct gemini_ethernet *geth;
2369 struct net_device *netdev;
2370 struct resource *gmacres;
2371 struct resource *dmares;
2372 struct device *parent;
2373 unsigned int id;
2374 int irq;
2375 int ret;
2376
2377 parent = dev->parent;
2378 geth = dev_get_drvdata(parent);
2379
2380 if (!strcmp(dev_name(dev), "60008000.ethernet-port"))
2381 id = 0;
2382 else if (!strcmp(dev_name(dev), "6000c000.ethernet-port"))
2383 id = 1;
2384 else
2385 return -ENODEV;
2386
2387 dev_info(dev, "probe %s ID %d\n", dev_name(dev), id);
2388
2389 netdev = alloc_etherdev_mq(sizeof(*port), TX_QUEUE_NUM);
2390 if (!netdev) {
2391 dev_err(dev, "Can't allocate ethernet device #%d\n", id);
2392 return -ENOMEM;
2393 }
2394
2395 port = netdev_priv(netdev);
2396 SET_NETDEV_DEV(netdev, dev);
2397 port->netdev = netdev;
2398 port->id = id;
2399 port->geth = geth;
2400 port->dev = dev;
2401 port->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
2402
2403 /* DMA memory */
2404 dmares = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2405 if (!dmares) {
2406 dev_err(dev, "no DMA resource\n");
2407 return -ENODEV;
2408 }
2409 port->dma_base = devm_ioremap_resource(dev, dmares);
2410 if (IS_ERR(port->dma_base))
2411 return PTR_ERR(port->dma_base);
2412
2413 /* GMAC config memory */
2414 gmacres = platform_get_resource(pdev, IORESOURCE_MEM, 1);
2415 if (!gmacres) {
2416 dev_err(dev, "no GMAC resource\n");
2417 return -ENODEV;
2418 }
2419 port->gmac_base = devm_ioremap_resource(dev, gmacres);
2420 if (IS_ERR(port->gmac_base))
2421 return PTR_ERR(port->gmac_base);
2422
2423 /* Interrupt */
2424 irq = platform_get_irq(pdev, 0);
2425 if (irq <= 0)
2426 return irq ? irq : -ENODEV;
2427 port->irq = irq;
2428
2429 /* Clock the port */
2430 port->pclk = devm_clk_get(dev, "PCLK");
2431 if (IS_ERR(port->pclk)) {
2432 dev_err(dev, "no PCLK\n");
2433 return PTR_ERR(port->pclk);
2434 }
2435 ret = clk_prepare_enable(port->pclk);
2436 if (ret)
2437 return ret;
2438
2439 /* Maybe there is a nice ethernet address we should use */
2440 gemini_port_save_mac_addr(port);
2441
2442 /* Reset the port */
2443 port->reset = devm_reset_control_get_exclusive(dev, NULL);
2444 if (IS_ERR(port->reset)) {
2445 dev_err(dev, "no reset\n");
2446 return PTR_ERR(port->reset);
2447 }
2448 reset_control_reset(port->reset);
2449 usleep_range(100, 500);
2450
2451 /* Assign pointer in the main state container */
2452 if (!id)
2453 geth->port0 = port;
2454 else
2455 geth->port1 = port;
2456
2457 /* This will just be done once both ports are up and reset */
2458 gemini_ethernet_init(geth);
2459
2460 platform_set_drvdata(pdev, port);
2461
2462 /* Set up and register the netdev */
2463 netdev->dev_id = port->id;
2464 netdev->irq = irq;
2465 netdev->netdev_ops = &gmac_351x_ops;
2466 netdev->ethtool_ops = &gmac_351x_ethtool_ops;
2467
2468 spin_lock_init(&port->config_lock);
2469 gmac_clear_hw_stats(netdev);
2470
2471 netdev->hw_features = GMAC_OFFLOAD_FEATURES;
2472 netdev->features |= GMAC_OFFLOAD_FEATURES | NETIF_F_GRO;
2473 /* We can handle jumbo frames up to 10236 bytes so, let's accept
2474 * payloads of 10236 bytes minus VLAN and ethernet header
2475 */
2476 netdev->min_mtu = ETH_MIN_MTU;
2477 netdev->max_mtu = 10236 - VLAN_ETH_HLEN;
2478
2479 port->freeq_refill = 0;
2480 netif_napi_add(netdev, &port->napi, gmac_napi_poll,
2481 DEFAULT_NAPI_WEIGHT);
2482
2483 if (is_valid_ether_addr((void *)port->mac_addr)) {
2484 memcpy(netdev->dev_addr, port->mac_addr, ETH_ALEN);
2485 } else {
2486 dev_dbg(dev, "ethernet address 0x%08x%08x%08x invalid\n",
2487 port->mac_addr[0], port->mac_addr[1],
2488 port->mac_addr[2]);
2489 dev_info(dev, "using a random ethernet address\n");
2490 eth_random_addr(netdev->dev_addr);
2491 }
2492 gmac_write_mac_address(netdev);
2493
2494 ret = devm_request_threaded_irq(port->dev,
2495 port->irq,
2496 gemini_port_irq,
2497 gemini_port_irq_thread,
2498 IRQF_SHARED,
2499 port_names[port->id],
2500 port);
2501 if (ret)
2502 return ret;
2503
2504 ret = register_netdev(netdev);
2505 if (!ret) {
2506 netdev_info(netdev,
2507 "irq %d, DMA @ 0x%pap, GMAC @ 0x%pap\n",
2508 port->irq, &dmares->start,
2509 &gmacres->start);
2510 ret = gmac_setup_phy(netdev);
2511 if (ret)
2512 netdev_info(netdev,
2513 "PHY init failed, deferring to ifup time\n");
2514 return 0;
2515 }
2516
2517 port->netdev = NULL;
2518 free_netdev(netdev);
2519 return ret;
2520}
2521
2522static int gemini_ethernet_port_remove(struct platform_device *pdev)
2523{
2524 struct gemini_ethernet_port *port = platform_get_drvdata(pdev);
2525
2526 gemini_port_remove(port);
2527 free_netdev(port->netdev);
2528 return 0;
2529}
2530
2531static const struct of_device_id gemini_ethernet_port_of_match[] = {
2532 {
2533 .compatible = "cortina,gemini-ethernet-port",
2534 },
2535 {},
2536};
2537MODULE_DEVICE_TABLE(of, gemini_ethernet_port_of_match);
2538
2539static struct platform_driver gemini_ethernet_port_driver = {
2540 .driver = {
2541 .name = "gemini-ethernet-port",
2542 .of_match_table = of_match_ptr(gemini_ethernet_port_of_match),
2543 },
2544 .probe = gemini_ethernet_port_probe,
2545 .remove = gemini_ethernet_port_remove,
2546};
2547
2548static int gemini_ethernet_probe(struct platform_device *pdev)
2549{
2550 struct device *dev = &pdev->dev;
2551 struct gemini_ethernet *geth;
2552 unsigned int retry = 5;
2553 struct resource *res;
2554 u32 val;
2555
2556 /* Global registers */
2557 geth = devm_kzalloc(dev, sizeof(*geth), GFP_KERNEL);
2558 if (!geth)
2559 return -ENOMEM;
2560 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2561 if (!res)
2562 return -ENODEV;
2563 geth->base = devm_ioremap_resource(dev, res);
2564 if (IS_ERR(geth->base))
2565 return PTR_ERR(geth->base);
2566 geth->dev = dev;
2567
2568 /* Wait for ports to stabilize */
2569 do {
2570 udelay(2);
2571 val = readl(geth->base + GLOBAL_TOE_VERSION_REG);
2572 barrier();
2573 } while (!val && --retry);
2574 if (!retry) {
2575 dev_err(dev, "failed to reset ethernet\n");
2576 return -EIO;
2577 }
2578 dev_info(dev, "Ethernet device ID: 0x%03x, revision 0x%01x\n",
2579 (val >> 4) & 0xFFFU, val & 0xFU);
2580
2581 spin_lock_init(&geth->irq_lock);
2582 spin_lock_init(&geth->freeq_lock);
2583
2584 /* The children will use this */
2585 platform_set_drvdata(pdev, geth);
2586
2587 /* Spawn child devices for the two ports */
2588 return devm_of_platform_populate(dev);
2589}
2590
2591static int gemini_ethernet_remove(struct platform_device *pdev)
2592{
2593 struct gemini_ethernet *geth = platform_get_drvdata(pdev);
2594
2595 geth_cleanup_freeq(geth);
2596 geth->initialized = false;
2597
2598 return 0;
2599}
2600
2601static const struct of_device_id gemini_ethernet_of_match[] = {
2602 {
2603 .compatible = "cortina,gemini-ethernet",
2604 },
2605 {},
2606};
2607MODULE_DEVICE_TABLE(of, gemini_ethernet_of_match);
2608
2609static struct platform_driver gemini_ethernet_driver = {
2610 .driver = {
2611 .name = DRV_NAME,
2612 .of_match_table = of_match_ptr(gemini_ethernet_of_match),
2613 },
2614 .probe = gemini_ethernet_probe,
2615 .remove = gemini_ethernet_remove,
2616};
2617
2618static int __init gemini_ethernet_module_init(void)
2619{
2620 int ret;
2621
2622 ret = platform_driver_register(&gemini_ethernet_port_driver);
2623 if (ret)
2624 return ret;
2625
2626 ret = platform_driver_register(&gemini_ethernet_driver);
2627 if (ret) {
2628 platform_driver_unregister(&gemini_ethernet_port_driver);
2629 return ret;
2630 }
2631
2632 return 0;
2633}
2634module_init(gemini_ethernet_module_init);
2635
2636static void __exit gemini_ethernet_module_exit(void)
2637{
2638 platform_driver_unregister(&gemini_ethernet_driver);
2639 platform_driver_unregister(&gemini_ethernet_port_driver);
2640}
2641module_exit(gemini_ethernet_module_exit);
2642
2643MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
2644MODULE_DESCRIPTION("StorLink SL351x (Gemini) ethernet driver");
2645MODULE_LICENSE("GPL");
2646MODULE_ALIAS("platform:" DRV_NAME);