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 #include <net/gro.h>
44 
45 #include "gemini.h"
46 
47 #define DRV_NAME		"gmac-gemini"
48 
49 #define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK)
50 static int debug = -1;
51 module_param(debug, int, 0);
52 MODULE_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 TX_MAX_FRAGS			16
73 #define TX_QUEUE_NUM			1	/* max: 6 */
74 #define RX_MAX_ALLOC_ORDER		2
75 
76 #define GMAC0_IRQ0_2 (GMAC0_TXDERR_INT_BIT | GMAC0_TXPERR_INT_BIT | \
77 		      GMAC0_RXDERR_INT_BIT | GMAC0_RXPERR_INT_BIT)
78 #define GMAC0_IRQ0_TXQ0_INTS (GMAC0_SWTQ00_EOF_INT_BIT | \
79 			      GMAC0_SWTQ00_FIN_INT_BIT)
80 #define GMAC0_IRQ4_8 (GMAC0_MIB_INT_BIT | GMAC0_RX_OVERRUN_INT_BIT)
81 
82 #define GMAC_OFFLOAD_FEATURES (NETIF_F_SG | NETIF_F_IP_CSUM | \
83 			       NETIF_F_IPV6_CSUM | NETIF_F_RXCSUM | \
84 			       NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6)
85 
86 /**
87  * struct gmac_queue_page - page buffer per-page info
88  * @page: the page struct
89  * @mapping: the dma address handle
90  */
91 struct gmac_queue_page {
92 	struct page *page;
93 	dma_addr_t mapping;
94 };
95 
96 struct gmac_txq {
97 	struct gmac_txdesc *ring;
98 	struct sk_buff	**skb;
99 	unsigned int	cptr;
100 	unsigned int	noirq_packets;
101 };
102 
103 struct gemini_ethernet;
104 
105 struct gemini_ethernet_port {
106 	u8 id; /* 0 or 1 */
107 
108 	struct gemini_ethernet *geth;
109 	struct net_device *netdev;
110 	struct device *dev;
111 	void __iomem *dma_base;
112 	void __iomem *gmac_base;
113 	struct clk *pclk;
114 	struct reset_control *reset;
115 	int irq;
116 	__le32 mac_addr[3];
117 
118 	void __iomem		*rxq_rwptr;
119 	struct gmac_rxdesc	*rxq_ring;
120 	unsigned int		rxq_order;
121 
122 	struct napi_struct	napi;
123 	struct hrtimer		rx_coalesce_timer;
124 	unsigned int		rx_coalesce_nsecs;
125 	unsigned int		freeq_refill;
126 	struct gmac_txq		txq[TX_QUEUE_NUM];
127 	unsigned int		txq_order;
128 	unsigned int		irq_every_tx_packets;
129 
130 	dma_addr_t		rxq_dma_base;
131 	dma_addr_t		txq_dma_base;
132 
133 	unsigned int		msg_enable;
134 	spinlock_t		config_lock; /* Locks config register */
135 
136 	struct u64_stats_sync	tx_stats_syncp;
137 	struct u64_stats_sync	rx_stats_syncp;
138 	struct u64_stats_sync	ir_stats_syncp;
139 
140 	struct rtnl_link_stats64 stats;
141 	u64			hw_stats[RX_STATS_NUM];
142 	u64			rx_stats[RX_STATUS_NUM];
143 	u64			rx_csum_stats[RX_CHKSUM_NUM];
144 	u64			rx_napi_exits;
145 	u64			tx_frag_stats[TX_MAX_FRAGS];
146 	u64			tx_frags_linearized;
147 	u64			tx_hw_csummed;
148 };
149 
150 struct gemini_ethernet {
151 	struct device *dev;
152 	void __iomem *base;
153 	struct gemini_ethernet_port *port0;
154 	struct gemini_ethernet_port *port1;
155 	bool initialized;
156 
157 	spinlock_t	irq_lock; /* Locks IRQ-related registers */
158 	unsigned int	freeq_order;
159 	unsigned int	freeq_frag_order;
160 	struct gmac_rxdesc *freeq_ring;
161 	dma_addr_t	freeq_dma_base;
162 	struct gmac_queue_page	*freeq_pages;
163 	unsigned int	num_freeq_pages;
164 	spinlock_t	freeq_lock; /* Locks queue from reentrance */
165 };
166 
167 #define GMAC_STATS_NUM	( \
168 	RX_STATS_NUM + RX_STATUS_NUM + RX_CHKSUM_NUM + 1 + \
169 	TX_MAX_FRAGS + 2)
170 
171 static const char gmac_stats_strings[GMAC_STATS_NUM][ETH_GSTRING_LEN] = {
172 	"GMAC_IN_DISCARDS",
173 	"GMAC_IN_ERRORS",
174 	"GMAC_IN_MCAST",
175 	"GMAC_IN_BCAST",
176 	"GMAC_IN_MAC1",
177 	"GMAC_IN_MAC2",
178 	"RX_STATUS_GOOD_FRAME",
179 	"RX_STATUS_TOO_LONG_GOOD_CRC",
180 	"RX_STATUS_RUNT_FRAME",
181 	"RX_STATUS_SFD_NOT_FOUND",
182 	"RX_STATUS_CRC_ERROR",
183 	"RX_STATUS_TOO_LONG_BAD_CRC",
184 	"RX_STATUS_ALIGNMENT_ERROR",
185 	"RX_STATUS_TOO_LONG_BAD_ALIGN",
186 	"RX_STATUS_RX_ERR",
187 	"RX_STATUS_DA_FILTERED",
188 	"RX_STATUS_BUFFER_FULL",
189 	"RX_STATUS_11",
190 	"RX_STATUS_12",
191 	"RX_STATUS_13",
192 	"RX_STATUS_14",
193 	"RX_STATUS_15",
194 	"RX_CHKSUM_IP_UDP_TCP_OK",
195 	"RX_CHKSUM_IP_OK_ONLY",
196 	"RX_CHKSUM_NONE",
197 	"RX_CHKSUM_3",
198 	"RX_CHKSUM_IP_ERR_UNKNOWN",
199 	"RX_CHKSUM_IP_ERR",
200 	"RX_CHKSUM_TCP_UDP_ERR",
201 	"RX_CHKSUM_7",
202 	"RX_NAPI_EXITS",
203 	"TX_FRAGS[1]",
204 	"TX_FRAGS[2]",
205 	"TX_FRAGS[3]",
206 	"TX_FRAGS[4]",
207 	"TX_FRAGS[5]",
208 	"TX_FRAGS[6]",
209 	"TX_FRAGS[7]",
210 	"TX_FRAGS[8]",
211 	"TX_FRAGS[9]",
212 	"TX_FRAGS[10]",
213 	"TX_FRAGS[11]",
214 	"TX_FRAGS[12]",
215 	"TX_FRAGS[13]",
216 	"TX_FRAGS[14]",
217 	"TX_FRAGS[15]",
218 	"TX_FRAGS[16+]",
219 	"TX_FRAGS_LINEARIZED",
220 	"TX_HW_CSUMMED",
221 };
222 
223 static void gmac_dump_dma_state(struct net_device *netdev);
224 
gmac_update_config0_reg(struct net_device * netdev,u32 val,u32 vmask)225 static void gmac_update_config0_reg(struct net_device *netdev,
226 				    u32 val, u32 vmask)
227 {
228 	struct gemini_ethernet_port *port = netdev_priv(netdev);
229 	unsigned long flags;
230 	u32 reg;
231 
232 	spin_lock_irqsave(&port->config_lock, flags);
233 
234 	reg = readl(port->gmac_base + GMAC_CONFIG0);
235 	reg = (reg & ~vmask) | val;
236 	writel(reg, port->gmac_base + GMAC_CONFIG0);
237 
238 	spin_unlock_irqrestore(&port->config_lock, flags);
239 }
240 
gmac_enable_tx_rx(struct net_device * netdev)241 static void gmac_enable_tx_rx(struct net_device *netdev)
242 {
243 	struct gemini_ethernet_port *port = netdev_priv(netdev);
244 	unsigned long flags;
245 	u32 reg;
246 
247 	spin_lock_irqsave(&port->config_lock, flags);
248 
249 	reg = readl(port->gmac_base + GMAC_CONFIG0);
250 	reg &= ~CONFIG0_TX_RX_DISABLE;
251 	writel(reg, port->gmac_base + GMAC_CONFIG0);
252 
253 	spin_unlock_irqrestore(&port->config_lock, flags);
254 }
255 
gmac_disable_tx_rx(struct net_device * netdev)256 static void gmac_disable_tx_rx(struct net_device *netdev)
257 {
258 	struct gemini_ethernet_port *port = netdev_priv(netdev);
259 	unsigned long flags;
260 	u32 val;
261 
262 	spin_lock_irqsave(&port->config_lock, flags);
263 
264 	val = readl(port->gmac_base + GMAC_CONFIG0);
265 	val |= CONFIG0_TX_RX_DISABLE;
266 	writel(val, port->gmac_base + GMAC_CONFIG0);
267 
268 	spin_unlock_irqrestore(&port->config_lock, flags);
269 
270 	mdelay(10);	/* let GMAC consume packet */
271 }
272 
gmac_set_flow_control(struct net_device * netdev,bool tx,bool rx)273 static void gmac_set_flow_control(struct net_device *netdev, bool tx, bool rx)
274 {
275 	struct gemini_ethernet_port *port = netdev_priv(netdev);
276 	unsigned long flags;
277 	u32 val;
278 
279 	spin_lock_irqsave(&port->config_lock, flags);
280 
281 	val = readl(port->gmac_base + GMAC_CONFIG0);
282 	val &= ~CONFIG0_FLOW_CTL;
283 	if (tx)
284 		val |= CONFIG0_FLOW_TX;
285 	if (rx)
286 		val |= CONFIG0_FLOW_RX;
287 	writel(val, port->gmac_base + GMAC_CONFIG0);
288 
289 	spin_unlock_irqrestore(&port->config_lock, flags);
290 }
291 
gmac_adjust_link(struct net_device * netdev)292 static void gmac_adjust_link(struct net_device *netdev)
293 {
294 	struct gemini_ethernet_port *port = netdev_priv(netdev);
295 	struct phy_device *phydev = netdev->phydev;
296 	union gmac_status status, old_status;
297 	bool pause_tx = false;
298 	bool pause_rx = false;
299 
300 	status.bits32 = readl(port->gmac_base + GMAC_STATUS);
301 	old_status.bits32 = status.bits32;
302 	status.bits.link = phydev->link;
303 	status.bits.duplex = phydev->duplex;
304 
305 	switch (phydev->speed) {
306 	case 1000:
307 		status.bits.speed = GMAC_SPEED_1000;
308 		if (phy_interface_mode_is_rgmii(phydev->interface))
309 			status.bits.mii_rmii = GMAC_PHY_RGMII_1000;
310 		netdev_dbg(netdev, "connect %s to RGMII @ 1Gbit\n",
311 			   phydev_name(phydev));
312 		break;
313 	case 100:
314 		status.bits.speed = GMAC_SPEED_100;
315 		if (phy_interface_mode_is_rgmii(phydev->interface))
316 			status.bits.mii_rmii = GMAC_PHY_RGMII_100_10;
317 		netdev_dbg(netdev, "connect %s to RGMII @ 100 Mbit\n",
318 			   phydev_name(phydev));
319 		break;
320 	case 10:
321 		status.bits.speed = GMAC_SPEED_10;
322 		if (phy_interface_mode_is_rgmii(phydev->interface))
323 			status.bits.mii_rmii = GMAC_PHY_RGMII_100_10;
324 		netdev_dbg(netdev, "connect %s to RGMII @ 10 Mbit\n",
325 			   phydev_name(phydev));
326 		break;
327 	default:
328 		netdev_warn(netdev, "Unsupported PHY speed (%d) on %s\n",
329 			    phydev->speed, phydev_name(phydev));
330 	}
331 
332 	if (phydev->duplex == DUPLEX_FULL) {
333 		phy_get_pause(phydev, &pause_tx, &pause_rx);
334 		netdev_dbg(netdev, "set negotiated pause params pause TX = %s, pause RX = %s\n",
335 			   pause_tx ? "ON" : "OFF", pause_rx ? "ON" : "OFF");
336 	}
337 
338 	gmac_set_flow_control(netdev, pause_tx, pause_rx);
339 
340 	if (old_status.bits32 == status.bits32)
341 		return;
342 
343 	if (netif_msg_link(port)) {
344 		phy_print_status(phydev);
345 		netdev_info(netdev, "link flow control: %s\n",
346 			    phydev->pause
347 			    ? (phydev->asym_pause ? "tx" : "both")
348 			    : (phydev->asym_pause ? "rx" : "none")
349 		);
350 	}
351 
352 	gmac_disable_tx_rx(netdev);
353 	writel(status.bits32, port->gmac_base + GMAC_STATUS);
354 	gmac_enable_tx_rx(netdev);
355 }
356 
gmac_setup_phy(struct net_device * netdev)357 static int gmac_setup_phy(struct net_device *netdev)
358 {
359 	struct gemini_ethernet_port *port = netdev_priv(netdev);
360 	union gmac_status status = { .bits32 = 0 };
361 	struct device *dev = port->dev;
362 	struct phy_device *phy;
363 
364 	phy = of_phy_get_and_connect(netdev,
365 				     dev->of_node,
366 				     gmac_adjust_link);
367 	if (!phy)
368 		return -ENODEV;
369 	netdev->phydev = phy;
370 
371 	phy_set_max_speed(phy, SPEED_1000);
372 	phy_support_asym_pause(phy);
373 
374 	/* set PHY interface type */
375 	switch (phy->interface) {
376 	case PHY_INTERFACE_MODE_MII:
377 		netdev_dbg(netdev,
378 			   "MII: set GMAC0 to GMII mode, GMAC1 disabled\n");
379 		status.bits.mii_rmii = GMAC_PHY_MII;
380 		break;
381 	case PHY_INTERFACE_MODE_GMII:
382 		netdev_dbg(netdev,
383 			   "GMII: set GMAC0 to GMII mode, GMAC1 disabled\n");
384 		status.bits.mii_rmii = GMAC_PHY_GMII;
385 		break;
386 	case PHY_INTERFACE_MODE_RGMII:
387 	case PHY_INTERFACE_MODE_RGMII_ID:
388 	case PHY_INTERFACE_MODE_RGMII_TXID:
389 	case PHY_INTERFACE_MODE_RGMII_RXID:
390 		netdev_dbg(netdev,
391 			   "RGMII: set GMAC0 and GMAC1 to MII/RGMII mode\n");
392 		status.bits.mii_rmii = GMAC_PHY_RGMII_100_10;
393 		break;
394 	default:
395 		netdev_err(netdev, "Unsupported MII interface\n");
396 		phy_disconnect(phy);
397 		netdev->phydev = NULL;
398 		return -EINVAL;
399 	}
400 	writel(status.bits32, port->gmac_base + GMAC_STATUS);
401 
402 	if (netif_msg_link(port))
403 		phy_attached_info(phy);
404 
405 	return 0;
406 }
407 
408 /* The maximum frame length is not logically enumerated in the
409  * hardware, so we do a table lookup to find the applicable max
410  * frame length.
411  */
412 struct gmac_max_framelen {
413 	unsigned int max_l3_len;
414 	u8 val;
415 };
416 
417 static const struct gmac_max_framelen gmac_maxlens[] = {
418 	{
419 		.max_l3_len = 1518,
420 		.val = CONFIG0_MAXLEN_1518,
421 	},
422 	{
423 		.max_l3_len = 1522,
424 		.val = CONFIG0_MAXLEN_1522,
425 	},
426 	{
427 		.max_l3_len = 1536,
428 		.val = CONFIG0_MAXLEN_1536,
429 	},
430 	{
431 		.max_l3_len = 1548,
432 		.val = CONFIG0_MAXLEN_1548,
433 	},
434 	{
435 		.max_l3_len = 9212,
436 		.val = CONFIG0_MAXLEN_9k,
437 	},
438 	{
439 		.max_l3_len = 10236,
440 		.val = CONFIG0_MAXLEN_10k,
441 	},
442 };
443 
gmac_pick_rx_max_len(unsigned int max_l3_len)444 static int gmac_pick_rx_max_len(unsigned int max_l3_len)
445 {
446 	const struct gmac_max_framelen *maxlen;
447 	int maxtot;
448 	int i;
449 
450 	maxtot = max_l3_len + ETH_HLEN + VLAN_HLEN;
451 
452 	for (i = 0; i < ARRAY_SIZE(gmac_maxlens); i++) {
453 		maxlen = &gmac_maxlens[i];
454 		if (maxtot <= maxlen->max_l3_len)
455 			return maxlen->val;
456 	}
457 
458 	return -1;
459 }
460 
gmac_init(struct net_device * netdev)461 static int gmac_init(struct net_device *netdev)
462 {
463 	struct gemini_ethernet_port *port = netdev_priv(netdev);
464 	union gmac_config0 config0 = { .bits = {
465 		.dis_tx = 1,
466 		.dis_rx = 1,
467 		.ipv4_rx_chksum = 1,
468 		.ipv6_rx_chksum = 1,
469 		.rx_err_detect = 1,
470 		.rgmm_edge = 1,
471 		.port0_chk_hwq = 1,
472 		.port1_chk_hwq = 1,
473 		.port0_chk_toeq = 1,
474 		.port1_chk_toeq = 1,
475 		.port0_chk_classq = 1,
476 		.port1_chk_classq = 1,
477 	} };
478 	union gmac_ahb_weight ahb_weight = { .bits = {
479 		.rx_weight = 1,
480 		.tx_weight = 1,
481 		.hash_weight = 1,
482 		.pre_req = 0x1f,
483 		.tq_dv_threshold = 0,
484 	} };
485 	union gmac_tx_wcr0 hw_weigh = { .bits = {
486 		.hw_tq3 = 1,
487 		.hw_tq2 = 1,
488 		.hw_tq1 = 1,
489 		.hw_tq0 = 1,
490 	} };
491 	union gmac_tx_wcr1 sw_weigh = { .bits = {
492 		.sw_tq5 = 1,
493 		.sw_tq4 = 1,
494 		.sw_tq3 = 1,
495 		.sw_tq2 = 1,
496 		.sw_tq1 = 1,
497 		.sw_tq0 = 1,
498 	} };
499 	union gmac_config1 config1 = { .bits = {
500 		.set_threshold = 16,
501 		.rel_threshold = 24,
502 	} };
503 	union gmac_config2 config2 = { .bits = {
504 		.set_threshold = 16,
505 		.rel_threshold = 32,
506 	} };
507 	union gmac_config3 config3 = { .bits = {
508 		.set_threshold = 0,
509 		.rel_threshold = 0,
510 	} };
511 	union gmac_config0 tmp;
512 
513 	config0.bits.max_len = gmac_pick_rx_max_len(netdev->mtu);
514 	tmp.bits32 = readl(port->gmac_base + GMAC_CONFIG0);
515 	config0.bits.reserved = tmp.bits.reserved;
516 	writel(config0.bits32, port->gmac_base + GMAC_CONFIG0);
517 	writel(config1.bits32, port->gmac_base + GMAC_CONFIG1);
518 	writel(config2.bits32, port->gmac_base + GMAC_CONFIG2);
519 	writel(config3.bits32, port->gmac_base + GMAC_CONFIG3);
520 
521 	readl(port->dma_base + GMAC_AHB_WEIGHT_REG);
522 	writel(ahb_weight.bits32, port->dma_base + GMAC_AHB_WEIGHT_REG);
523 
524 	writel(hw_weigh.bits32,
525 	       port->dma_base + GMAC_TX_WEIGHTING_CTRL_0_REG);
526 	writel(sw_weigh.bits32,
527 	       port->dma_base + GMAC_TX_WEIGHTING_CTRL_1_REG);
528 
529 	port->rxq_order = DEFAULT_GMAC_RXQ_ORDER;
530 	port->txq_order = DEFAULT_GMAC_TXQ_ORDER;
531 	port->rx_coalesce_nsecs = DEFAULT_RX_COALESCE_NSECS;
532 
533 	/* Mark every quarter of the queue a packet for interrupt
534 	 * in order to be able to wake up the queue if it was stopped
535 	 */
536 	port->irq_every_tx_packets = 1 << (port->txq_order - 2);
537 
538 	return 0;
539 }
540 
gmac_setup_txqs(struct net_device * netdev)541 static int gmac_setup_txqs(struct net_device *netdev)
542 {
543 	struct gemini_ethernet_port *port = netdev_priv(netdev);
544 	unsigned int n_txq = netdev->num_tx_queues;
545 	struct gemini_ethernet *geth = port->geth;
546 	size_t entries = 1 << port->txq_order;
547 	struct gmac_txq *txq = port->txq;
548 	struct gmac_txdesc *desc_ring;
549 	size_t len = n_txq * entries;
550 	struct sk_buff **skb_tab;
551 	void __iomem *rwptr_reg;
552 	unsigned int r;
553 	int i;
554 
555 	rwptr_reg = port->dma_base + GMAC_SW_TX_QUEUE0_PTR_REG;
556 
557 	skb_tab = kcalloc(len, sizeof(*skb_tab), GFP_KERNEL);
558 	if (!skb_tab)
559 		return -ENOMEM;
560 
561 	desc_ring = dma_alloc_coherent(geth->dev, len * sizeof(*desc_ring),
562 				       &port->txq_dma_base, GFP_KERNEL);
563 
564 	if (!desc_ring) {
565 		kfree(skb_tab);
566 		return -ENOMEM;
567 	}
568 
569 	if (port->txq_dma_base & ~DMA_Q_BASE_MASK) {
570 		dev_warn(geth->dev, "TX queue base is not aligned\n");
571 		dma_free_coherent(geth->dev, len * sizeof(*desc_ring),
572 				  desc_ring, port->txq_dma_base);
573 		kfree(skb_tab);
574 		return -ENOMEM;
575 	}
576 
577 	writel(port->txq_dma_base | port->txq_order,
578 	       port->dma_base + GMAC_SW_TX_QUEUE_BASE_REG);
579 
580 	for (i = 0; i < n_txq; i++) {
581 		txq->ring = desc_ring;
582 		txq->skb = skb_tab;
583 		txq->noirq_packets = 0;
584 
585 		r = readw(rwptr_reg);
586 		rwptr_reg += 2;
587 		writew(r, rwptr_reg);
588 		rwptr_reg += 2;
589 		txq->cptr = r;
590 
591 		txq++;
592 		desc_ring += entries;
593 		skb_tab += entries;
594 	}
595 
596 	return 0;
597 }
598 
gmac_clean_txq(struct net_device * netdev,struct gmac_txq * txq,unsigned int r)599 static void gmac_clean_txq(struct net_device *netdev, struct gmac_txq *txq,
600 			   unsigned int r)
601 {
602 	struct gemini_ethernet_port *port = netdev_priv(netdev);
603 	unsigned int m = (1 << port->txq_order) - 1;
604 	struct gemini_ethernet *geth = port->geth;
605 	unsigned int c = txq->cptr;
606 	union gmac_txdesc_0 word0;
607 	union gmac_txdesc_1 word1;
608 	unsigned int hwchksum = 0;
609 	unsigned long bytes = 0;
610 	struct gmac_txdesc *txd;
611 	unsigned short nfrags;
612 	unsigned int errs = 0;
613 	unsigned int pkts = 0;
614 	unsigned int word3;
615 	dma_addr_t mapping;
616 
617 	if (c == r)
618 		return;
619 
620 	while (c != r) {
621 		txd = txq->ring + c;
622 		word0 = txd->word0;
623 		word1 = txd->word1;
624 		mapping = txd->word2.buf_adr;
625 		word3 = txd->word3.bits32;
626 
627 		dma_unmap_single(geth->dev, mapping,
628 				 word0.bits.buffer_size, DMA_TO_DEVICE);
629 
630 		if (word3 & EOF_BIT)
631 			dev_kfree_skb(txq->skb[c]);
632 
633 		c++;
634 		c &= m;
635 
636 		if (!(word3 & SOF_BIT))
637 			continue;
638 
639 		if (!word0.bits.status_tx_ok) {
640 			errs++;
641 			continue;
642 		}
643 
644 		pkts++;
645 		bytes += txd->word1.bits.byte_count;
646 
647 		if (word1.bits32 & TSS_CHECKUM_ENABLE)
648 			hwchksum++;
649 
650 		nfrags = word0.bits.desc_count - 1;
651 		if (nfrags) {
652 			if (nfrags >= TX_MAX_FRAGS)
653 				nfrags = TX_MAX_FRAGS - 1;
654 
655 			u64_stats_update_begin(&port->tx_stats_syncp);
656 			port->tx_frag_stats[nfrags]++;
657 			u64_stats_update_end(&port->tx_stats_syncp);
658 		}
659 	}
660 
661 	u64_stats_update_begin(&port->ir_stats_syncp);
662 	port->stats.tx_errors += errs;
663 	port->stats.tx_packets += pkts;
664 	port->stats.tx_bytes += bytes;
665 	port->tx_hw_csummed += hwchksum;
666 	u64_stats_update_end(&port->ir_stats_syncp);
667 
668 	txq->cptr = c;
669 }
670 
gmac_cleanup_txqs(struct net_device * netdev)671 static void gmac_cleanup_txqs(struct net_device *netdev)
672 {
673 	struct gemini_ethernet_port *port = netdev_priv(netdev);
674 	unsigned int n_txq = netdev->num_tx_queues;
675 	struct gemini_ethernet *geth = port->geth;
676 	void __iomem *rwptr_reg;
677 	unsigned int r, i;
678 
679 	rwptr_reg = port->dma_base + GMAC_SW_TX_QUEUE0_PTR_REG;
680 
681 	for (i = 0; i < n_txq; i++) {
682 		r = readw(rwptr_reg);
683 		rwptr_reg += 2;
684 		writew(r, rwptr_reg);
685 		rwptr_reg += 2;
686 
687 		gmac_clean_txq(netdev, port->txq + i, r);
688 	}
689 	writel(0, port->dma_base + GMAC_SW_TX_QUEUE_BASE_REG);
690 
691 	kfree(port->txq->skb);
692 	dma_free_coherent(geth->dev,
693 			  n_txq * sizeof(*port->txq->ring) << port->txq_order,
694 			  port->txq->ring, port->txq_dma_base);
695 }
696 
gmac_setup_rxq(struct net_device * netdev)697 static int gmac_setup_rxq(struct net_device *netdev)
698 {
699 	struct gemini_ethernet_port *port = netdev_priv(netdev);
700 	struct gemini_ethernet *geth = port->geth;
701 	struct nontoe_qhdr __iomem *qhdr;
702 
703 	qhdr = geth->base + TOE_DEFAULT_Q_HDR_BASE(netdev->dev_id);
704 	port->rxq_rwptr = &qhdr->word1;
705 
706 	/* Remap a slew of memory to use for the RX queue */
707 	port->rxq_ring = dma_alloc_coherent(geth->dev,
708 				sizeof(*port->rxq_ring) << port->rxq_order,
709 				&port->rxq_dma_base, GFP_KERNEL);
710 	if (!port->rxq_ring)
711 		return -ENOMEM;
712 	if (port->rxq_dma_base & ~NONTOE_QHDR0_BASE_MASK) {
713 		dev_warn(geth->dev, "RX queue base is not aligned\n");
714 		return -ENOMEM;
715 	}
716 
717 	writel(port->rxq_dma_base | port->rxq_order, &qhdr->word0);
718 	writel(0, port->rxq_rwptr);
719 	return 0;
720 }
721 
722 static struct gmac_queue_page *
gmac_get_queue_page(struct gemini_ethernet * geth,struct gemini_ethernet_port * port,dma_addr_t addr)723 gmac_get_queue_page(struct gemini_ethernet *geth,
724 		    struct gemini_ethernet_port *port,
725 		    dma_addr_t addr)
726 {
727 	struct gmac_queue_page *gpage;
728 	dma_addr_t mapping;
729 	int i;
730 
731 	/* Only look for even pages */
732 	mapping = addr & PAGE_MASK;
733 
734 	if (!geth->freeq_pages) {
735 		dev_err(geth->dev, "try to get page with no page list\n");
736 		return NULL;
737 	}
738 
739 	/* Look up a ring buffer page from virtual mapping */
740 	for (i = 0; i < geth->num_freeq_pages; i++) {
741 		gpage = &geth->freeq_pages[i];
742 		if (gpage->mapping == mapping)
743 			return gpage;
744 	}
745 
746 	return NULL;
747 }
748 
gmac_cleanup_rxq(struct net_device * netdev)749 static void gmac_cleanup_rxq(struct net_device *netdev)
750 {
751 	struct gemini_ethernet_port *port = netdev_priv(netdev);
752 	struct gemini_ethernet *geth = port->geth;
753 	struct gmac_rxdesc *rxd = port->rxq_ring;
754 	static struct gmac_queue_page *gpage;
755 	struct nontoe_qhdr __iomem *qhdr;
756 	void __iomem *dma_reg;
757 	void __iomem *ptr_reg;
758 	dma_addr_t mapping;
759 	union dma_rwptr rw;
760 	unsigned int r, w;
761 
762 	qhdr = geth->base +
763 		TOE_DEFAULT_Q_HDR_BASE(netdev->dev_id);
764 	dma_reg = &qhdr->word0;
765 	ptr_reg = &qhdr->word1;
766 
767 	rw.bits32 = readl(ptr_reg);
768 	r = rw.bits.rptr;
769 	w = rw.bits.wptr;
770 	writew(r, ptr_reg + 2);
771 
772 	writel(0, dma_reg);
773 
774 	/* Loop from read pointer to write pointer of the RX queue
775 	 * and free up all pages by the queue.
776 	 */
777 	while (r != w) {
778 		mapping = rxd[r].word2.buf_adr;
779 		r++;
780 		r &= ((1 << port->rxq_order) - 1);
781 
782 		if (!mapping)
783 			continue;
784 
785 		/* Freeq pointers are one page off */
786 		gpage = gmac_get_queue_page(geth, port, mapping + PAGE_SIZE);
787 		if (!gpage) {
788 			dev_err(geth->dev, "could not find page\n");
789 			continue;
790 		}
791 		/* Release the RX queue reference to the page */
792 		put_page(gpage->page);
793 	}
794 
795 	dma_free_coherent(geth->dev, sizeof(*port->rxq_ring) << port->rxq_order,
796 			  port->rxq_ring, port->rxq_dma_base);
797 }
798 
geth_freeq_alloc_map_page(struct gemini_ethernet * geth,int pn)799 static struct page *geth_freeq_alloc_map_page(struct gemini_ethernet *geth,
800 					      int pn)
801 {
802 	struct gmac_rxdesc *freeq_entry;
803 	struct gmac_queue_page *gpage;
804 	unsigned int fpp_order;
805 	unsigned int frag_len;
806 	dma_addr_t mapping;
807 	struct page *page;
808 	int i;
809 
810 	/* First allocate and DMA map a single page */
811 	page = alloc_page(GFP_ATOMIC);
812 	if (!page)
813 		return NULL;
814 
815 	mapping = dma_map_single(geth->dev, page_address(page),
816 				 PAGE_SIZE, DMA_FROM_DEVICE);
817 	if (dma_mapping_error(geth->dev, mapping)) {
818 		put_page(page);
819 		return NULL;
820 	}
821 
822 	/* The assign the page mapping (physical address) to the buffer address
823 	 * in the hardware queue. PAGE_SHIFT on ARM is 12 (1 page is 4096 bytes,
824 	 * 4k), and the default RX frag order is 11 (fragments are up 20 2048
825 	 * bytes, 2k) so fpp_order (fragments per page order) is default 1. Thus
826 	 * each page normally needs two entries in the queue.
827 	 */
828 	frag_len = 1 << geth->freeq_frag_order; /* Usually 2048 */
829 	fpp_order = PAGE_SHIFT - geth->freeq_frag_order;
830 	freeq_entry = geth->freeq_ring + (pn << fpp_order);
831 	dev_dbg(geth->dev, "allocate page %d fragment length %d fragments per page %d, freeq entry %p\n",
832 		 pn, frag_len, (1 << fpp_order), freeq_entry);
833 	for (i = (1 << fpp_order); i > 0; i--) {
834 		freeq_entry->word2.buf_adr = mapping;
835 		freeq_entry++;
836 		mapping += frag_len;
837 	}
838 
839 	/* If the freeq entry already has a page mapped, then unmap it. */
840 	gpage = &geth->freeq_pages[pn];
841 	if (gpage->page) {
842 		mapping = geth->freeq_ring[pn << fpp_order].word2.buf_adr;
843 		dma_unmap_single(geth->dev, mapping, frag_len, DMA_FROM_DEVICE);
844 		/* This should be the last reference to the page so it gets
845 		 * released
846 		 */
847 		put_page(gpage->page);
848 	}
849 
850 	/* Then put our new mapping into the page table */
851 	dev_dbg(geth->dev, "page %d, DMA addr: %08x, page %p\n",
852 		pn, (unsigned int)mapping, page);
853 	gpage->mapping = mapping;
854 	gpage->page = page;
855 
856 	return page;
857 }
858 
859 /**
860  * geth_fill_freeq() - Fill the freeq with empty fragments to use
861  * @geth: the ethernet adapter
862  * @refill: whether to reset the queue by filling in all freeq entries or
863  * just refill it, usually the interrupt to refill the queue happens when
864  * the queue is half empty.
865  */
geth_fill_freeq(struct gemini_ethernet * geth,bool refill)866 static unsigned int geth_fill_freeq(struct gemini_ethernet *geth, bool refill)
867 {
868 	unsigned int fpp_order = PAGE_SHIFT - geth->freeq_frag_order;
869 	unsigned int count = 0;
870 	unsigned int pn, epn;
871 	unsigned long flags;
872 	union dma_rwptr rw;
873 	unsigned int m_pn;
874 
875 	/* Mask for page */
876 	m_pn = (1 << (geth->freeq_order - fpp_order)) - 1;
877 
878 	spin_lock_irqsave(&geth->freeq_lock, flags);
879 
880 	rw.bits32 = readl(geth->base + GLOBAL_SWFQ_RWPTR_REG);
881 	pn = (refill ? rw.bits.wptr : rw.bits.rptr) >> fpp_order;
882 	epn = (rw.bits.rptr >> fpp_order) - 1;
883 	epn &= m_pn;
884 
885 	/* Loop over the freeq ring buffer entries */
886 	while (pn != epn) {
887 		struct gmac_queue_page *gpage;
888 		struct page *page;
889 
890 		gpage = &geth->freeq_pages[pn];
891 		page = gpage->page;
892 
893 		dev_dbg(geth->dev, "fill entry %d page ref count %d add %d refs\n",
894 			pn, page_ref_count(page), 1 << fpp_order);
895 
896 		if (page_ref_count(page) > 1) {
897 			unsigned int fl = (pn - epn) & m_pn;
898 
899 			if (fl > 64 >> fpp_order)
900 				break;
901 
902 			page = geth_freeq_alloc_map_page(geth, pn);
903 			if (!page)
904 				break;
905 		}
906 
907 		/* Add one reference per fragment in the page */
908 		page_ref_add(page, 1 << fpp_order);
909 		count += 1 << fpp_order;
910 		pn++;
911 		pn &= m_pn;
912 	}
913 
914 	writew(pn << fpp_order, geth->base + GLOBAL_SWFQ_RWPTR_REG + 2);
915 
916 	spin_unlock_irqrestore(&geth->freeq_lock, flags);
917 
918 	return count;
919 }
920 
geth_setup_freeq(struct gemini_ethernet * geth)921 static int geth_setup_freeq(struct gemini_ethernet *geth)
922 {
923 	unsigned int fpp_order = PAGE_SHIFT - geth->freeq_frag_order;
924 	unsigned int frag_len = 1 << geth->freeq_frag_order;
925 	unsigned int len = 1 << geth->freeq_order;
926 	unsigned int pages = len >> fpp_order;
927 	union queue_threshold qt;
928 	union dma_skb_size skbsz;
929 	unsigned int filled;
930 	unsigned int pn;
931 
932 	geth->freeq_ring = dma_alloc_coherent(geth->dev,
933 		sizeof(*geth->freeq_ring) << geth->freeq_order,
934 		&geth->freeq_dma_base, GFP_KERNEL);
935 	if (!geth->freeq_ring)
936 		return -ENOMEM;
937 	if (geth->freeq_dma_base & ~DMA_Q_BASE_MASK) {
938 		dev_warn(geth->dev, "queue ring base is not aligned\n");
939 		goto err_freeq;
940 	}
941 
942 	/* Allocate a mapping to page look-up index */
943 	geth->freeq_pages = kcalloc(pages, sizeof(*geth->freeq_pages),
944 				    GFP_KERNEL);
945 	if (!geth->freeq_pages)
946 		goto err_freeq;
947 	geth->num_freeq_pages = pages;
948 
949 	dev_info(geth->dev, "allocate %d pages for queue\n", pages);
950 	for (pn = 0; pn < pages; pn++)
951 		if (!geth_freeq_alloc_map_page(geth, pn))
952 			goto err_freeq_alloc;
953 
954 	filled = geth_fill_freeq(geth, false);
955 	if (!filled)
956 		goto err_freeq_alloc;
957 
958 	qt.bits32 = readl(geth->base + GLOBAL_QUEUE_THRESHOLD_REG);
959 	qt.bits.swfq_empty = 32;
960 	writel(qt.bits32, geth->base + GLOBAL_QUEUE_THRESHOLD_REG);
961 
962 	skbsz.bits.sw_skb_size = 1 << geth->freeq_frag_order;
963 	writel(skbsz.bits32, geth->base + GLOBAL_DMA_SKB_SIZE_REG);
964 	writel(geth->freeq_dma_base | geth->freeq_order,
965 	       geth->base + GLOBAL_SW_FREEQ_BASE_SIZE_REG);
966 
967 	return 0;
968 
969 err_freeq_alloc:
970 	while (pn > 0) {
971 		struct gmac_queue_page *gpage;
972 		dma_addr_t mapping;
973 
974 		--pn;
975 		mapping = geth->freeq_ring[pn << fpp_order].word2.buf_adr;
976 		dma_unmap_single(geth->dev, mapping, frag_len, DMA_FROM_DEVICE);
977 		gpage = &geth->freeq_pages[pn];
978 		put_page(gpage->page);
979 	}
980 
981 	kfree(geth->freeq_pages);
982 err_freeq:
983 	dma_free_coherent(geth->dev,
984 			  sizeof(*geth->freeq_ring) << geth->freeq_order,
985 			  geth->freeq_ring, geth->freeq_dma_base);
986 	geth->freeq_ring = NULL;
987 	return -ENOMEM;
988 }
989 
990 /**
991  * geth_cleanup_freeq() - cleanup the DMA mappings and free the queue
992  * @geth: the Gemini global ethernet state
993  */
geth_cleanup_freeq(struct gemini_ethernet * geth)994 static void geth_cleanup_freeq(struct gemini_ethernet *geth)
995 {
996 	unsigned int fpp_order = PAGE_SHIFT - geth->freeq_frag_order;
997 	unsigned int frag_len = 1 << geth->freeq_frag_order;
998 	unsigned int len = 1 << geth->freeq_order;
999 	unsigned int pages = len >> fpp_order;
1000 	unsigned int pn;
1001 
1002 	writew(readw(geth->base + GLOBAL_SWFQ_RWPTR_REG),
1003 	       geth->base + GLOBAL_SWFQ_RWPTR_REG + 2);
1004 	writel(0, geth->base + GLOBAL_SW_FREEQ_BASE_SIZE_REG);
1005 
1006 	for (pn = 0; pn < pages; pn++) {
1007 		struct gmac_queue_page *gpage;
1008 		dma_addr_t mapping;
1009 
1010 		mapping = geth->freeq_ring[pn << fpp_order].word2.buf_adr;
1011 		dma_unmap_single(geth->dev, mapping, frag_len, DMA_FROM_DEVICE);
1012 
1013 		gpage = &geth->freeq_pages[pn];
1014 		while (page_ref_count(gpage->page) > 0)
1015 			put_page(gpage->page);
1016 	}
1017 
1018 	kfree(geth->freeq_pages);
1019 
1020 	dma_free_coherent(geth->dev,
1021 			  sizeof(*geth->freeq_ring) << geth->freeq_order,
1022 			  geth->freeq_ring, geth->freeq_dma_base);
1023 }
1024 
1025 /**
1026  * geth_resize_freeq() - resize the software queue depth
1027  * @port: the port requesting the change
1028  *
1029  * This gets called at least once during probe() so the device queue gets
1030  * "resized" from the hardware defaults. Since both ports/net devices share
1031  * the same hardware queue, some synchronization between the ports is
1032  * needed.
1033  */
geth_resize_freeq(struct gemini_ethernet_port * port)1034 static int geth_resize_freeq(struct gemini_ethernet_port *port)
1035 {
1036 	struct gemini_ethernet *geth = port->geth;
1037 	struct net_device *netdev = port->netdev;
1038 	struct gemini_ethernet_port *other_port;
1039 	struct net_device *other_netdev;
1040 	unsigned int new_size = 0;
1041 	unsigned int new_order;
1042 	unsigned long flags;
1043 	u32 en;
1044 	int ret;
1045 
1046 	if (netdev->dev_id == 0)
1047 		other_netdev = geth->port1->netdev;
1048 	else
1049 		other_netdev = geth->port0->netdev;
1050 
1051 	if (other_netdev && netif_running(other_netdev))
1052 		return -EBUSY;
1053 
1054 	new_size = 1 << (port->rxq_order + 1);
1055 	netdev_dbg(netdev, "port %d size: %d order %d\n",
1056 		   netdev->dev_id,
1057 		   new_size,
1058 		   port->rxq_order);
1059 	if (other_netdev) {
1060 		other_port = netdev_priv(other_netdev);
1061 		new_size += 1 << (other_port->rxq_order + 1);
1062 		netdev_dbg(other_netdev, "port %d size: %d order %d\n",
1063 			   other_netdev->dev_id,
1064 			   (1 << (other_port->rxq_order + 1)),
1065 			   other_port->rxq_order);
1066 	}
1067 
1068 	new_order = min(15, ilog2(new_size - 1) + 1);
1069 	dev_dbg(geth->dev, "set shared queue to size %d order %d\n",
1070 		new_size, new_order);
1071 	if (geth->freeq_order == new_order)
1072 		return 0;
1073 
1074 	spin_lock_irqsave(&geth->irq_lock, flags);
1075 
1076 	/* Disable the software queue IRQs */
1077 	en = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
1078 	en &= ~SWFQ_EMPTY_INT_BIT;
1079 	writel(en, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
1080 	spin_unlock_irqrestore(&geth->irq_lock, flags);
1081 
1082 	/* Drop the old queue */
1083 	if (geth->freeq_ring)
1084 		geth_cleanup_freeq(geth);
1085 
1086 	/* Allocate a new queue with the desired order */
1087 	geth->freeq_order = new_order;
1088 	ret = geth_setup_freeq(geth);
1089 
1090 	/* Restart the interrupts - NOTE if this is the first resize
1091 	 * after probe(), this is where the interrupts get turned on
1092 	 * in the first place.
1093 	 */
1094 	spin_lock_irqsave(&geth->irq_lock, flags);
1095 	en |= SWFQ_EMPTY_INT_BIT;
1096 	writel(en, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
1097 	spin_unlock_irqrestore(&geth->irq_lock, flags);
1098 
1099 	return ret;
1100 }
1101 
gmac_tx_irq_enable(struct net_device * netdev,unsigned int txq,int en)1102 static void gmac_tx_irq_enable(struct net_device *netdev,
1103 			       unsigned int txq, int en)
1104 {
1105 	struct gemini_ethernet_port *port = netdev_priv(netdev);
1106 	struct gemini_ethernet *geth = port->geth;
1107 	unsigned long flags;
1108 	u32 val, mask;
1109 
1110 	netdev_dbg(netdev, "%s device %d\n", __func__, netdev->dev_id);
1111 
1112 	spin_lock_irqsave(&geth->irq_lock, flags);
1113 
1114 	mask = GMAC0_IRQ0_TXQ0_INTS << (6 * netdev->dev_id + txq);
1115 
1116 	if (en)
1117 		writel(mask, geth->base + GLOBAL_INTERRUPT_STATUS_0_REG);
1118 
1119 	val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
1120 	val = en ? val | mask : val & ~mask;
1121 	writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
1122 
1123 	spin_unlock_irqrestore(&geth->irq_lock, flags);
1124 }
1125 
gmac_tx_irq(struct net_device * netdev,unsigned int txq_num)1126 static void gmac_tx_irq(struct net_device *netdev, unsigned int txq_num)
1127 {
1128 	struct netdev_queue *ntxq = netdev_get_tx_queue(netdev, txq_num);
1129 
1130 	gmac_tx_irq_enable(netdev, txq_num, 0);
1131 	netif_tx_wake_queue(ntxq);
1132 }
1133 
gmac_map_tx_bufs(struct net_device * netdev,struct sk_buff * skb,struct gmac_txq * txq,unsigned short * desc)1134 static int gmac_map_tx_bufs(struct net_device *netdev, struct sk_buff *skb,
1135 			    struct gmac_txq *txq, unsigned short *desc)
1136 {
1137 	struct gemini_ethernet_port *port = netdev_priv(netdev);
1138 	struct skb_shared_info *skb_si =  skb_shinfo(skb);
1139 	unsigned short m = (1 << port->txq_order) - 1;
1140 	short frag, last_frag = skb_si->nr_frags - 1;
1141 	struct gemini_ethernet *geth = port->geth;
1142 	unsigned int word1, word3, buflen;
1143 	unsigned short w = *desc;
1144 	struct gmac_txdesc *txd;
1145 	skb_frag_t *skb_frag;
1146 	dma_addr_t mapping;
1147 	void *buffer;
1148 	u16 mss;
1149 	int ret;
1150 
1151 	word1 = skb->len;
1152 	word3 = SOF_BIT;
1153 
1154 	mss = skb_shinfo(skb)->gso_size;
1155 	if (mss) {
1156 		/* This means we are dealing with TCP and skb->len is the
1157 		 * sum total of all the segments. The TSO will deal with
1158 		 * chopping this up for us.
1159 		 */
1160 		/* The accelerator needs the full frame size here */
1161 		mss += skb_tcp_all_headers(skb);
1162 		netdev_dbg(netdev, "segment offloading mss = %04x len=%04x\n",
1163 			   mss, skb->len);
1164 		word1 |= TSS_MTU_ENABLE_BIT;
1165 		word3 |= mss;
1166 	} else if (skb->len >= ETH_FRAME_LEN) {
1167 		/* Hardware offloaded checksumming isn't working on frames
1168 		 * bigger than 1514 bytes. A hypothesis about this is that the
1169 		 * checksum buffer is only 1518 bytes, so when the frames get
1170 		 * bigger they get truncated, or the last few bytes get
1171 		 * overwritten by the FCS.
1172 		 *
1173 		 * Just use software checksumming and bypass on bigger frames.
1174 		 */
1175 		if (skb->ip_summed == CHECKSUM_PARTIAL) {
1176 			ret = skb_checksum_help(skb);
1177 			if (ret)
1178 				return ret;
1179 		}
1180 		word1 |= TSS_BYPASS_BIT;
1181 	}
1182 
1183 	if (skb->ip_summed == CHECKSUM_PARTIAL) {
1184 		int tcp = 0;
1185 
1186 		/* We do not switch off the checksumming on non TCP/UDP
1187 		 * frames: as is shown from tests, the checksumming engine
1188 		 * is smart enough to see that a frame is not actually TCP
1189 		 * or UDP and then just pass it through without any changes
1190 		 * to the frame.
1191 		 */
1192 		if (skb->protocol == htons(ETH_P_IP)) {
1193 			word1 |= TSS_IP_CHKSUM_BIT;
1194 			tcp = ip_hdr(skb)->protocol == IPPROTO_TCP;
1195 		} else { /* IPv6 */
1196 			word1 |= TSS_IPV6_ENABLE_BIT;
1197 			tcp = ipv6_hdr(skb)->nexthdr == IPPROTO_TCP;
1198 		}
1199 
1200 		word1 |= tcp ? TSS_TCP_CHKSUM_BIT : TSS_UDP_CHKSUM_BIT;
1201 	}
1202 
1203 	frag = -1;
1204 	while (frag <= last_frag) {
1205 		if (frag == -1) {
1206 			buffer = skb->data;
1207 			buflen = skb_headlen(skb);
1208 		} else {
1209 			skb_frag = skb_si->frags + frag;
1210 			buffer = skb_frag_address(skb_frag);
1211 			buflen = skb_frag_size(skb_frag);
1212 		}
1213 
1214 		if (frag == last_frag) {
1215 			word3 |= EOF_BIT;
1216 			txq->skb[w] = skb;
1217 		}
1218 
1219 		mapping = dma_map_single(geth->dev, buffer, buflen,
1220 					 DMA_TO_DEVICE);
1221 		if (dma_mapping_error(geth->dev, mapping))
1222 			goto map_error;
1223 
1224 		txd = txq->ring + w;
1225 		txd->word0.bits32 = buflen;
1226 		txd->word1.bits32 = word1;
1227 		txd->word2.buf_adr = mapping;
1228 		txd->word3.bits32 = word3;
1229 
1230 		word3 &= MTU_SIZE_BIT_MASK;
1231 		w++;
1232 		w &= m;
1233 		frag++;
1234 	}
1235 
1236 	*desc = w;
1237 	return 0;
1238 
1239 map_error:
1240 	while (w != *desc) {
1241 		w--;
1242 		w &= m;
1243 
1244 		dma_unmap_page(geth->dev, txq->ring[w].word2.buf_adr,
1245 			       txq->ring[w].word0.bits.buffer_size,
1246 			       DMA_TO_DEVICE);
1247 	}
1248 	return -ENOMEM;
1249 }
1250 
gmac_start_xmit(struct sk_buff * skb,struct net_device * netdev)1251 static netdev_tx_t gmac_start_xmit(struct sk_buff *skb,
1252 				   struct net_device *netdev)
1253 {
1254 	struct gemini_ethernet_port *port = netdev_priv(netdev);
1255 	unsigned short m = (1 << port->txq_order) - 1;
1256 	struct netdev_queue *ntxq;
1257 	unsigned short r, w, d;
1258 	void __iomem *ptr_reg;
1259 	struct gmac_txq *txq;
1260 	int txq_num, nfrags;
1261 	union dma_rwptr rw;
1262 
1263 	if (skb->len >= 0x10000)
1264 		goto out_drop_free;
1265 
1266 	txq_num = skb_get_queue_mapping(skb);
1267 	ptr_reg = port->dma_base + GMAC_SW_TX_QUEUE_PTR_REG(txq_num);
1268 	txq = &port->txq[txq_num];
1269 	ntxq = netdev_get_tx_queue(netdev, txq_num);
1270 	nfrags = skb_shinfo(skb)->nr_frags;
1271 
1272 	rw.bits32 = readl(ptr_reg);
1273 	r = rw.bits.rptr;
1274 	w = rw.bits.wptr;
1275 
1276 	d = txq->cptr - w - 1;
1277 	d &= m;
1278 
1279 	if (d < nfrags + 2) {
1280 		gmac_clean_txq(netdev, txq, r);
1281 		d = txq->cptr - w - 1;
1282 		d &= m;
1283 
1284 		if (d < nfrags + 2) {
1285 			netif_tx_stop_queue(ntxq);
1286 
1287 			d = txq->cptr + nfrags + 16;
1288 			d &= m;
1289 			txq->ring[d].word3.bits.eofie = 1;
1290 			gmac_tx_irq_enable(netdev, txq_num, 1);
1291 
1292 			u64_stats_update_begin(&port->tx_stats_syncp);
1293 			netdev->stats.tx_fifo_errors++;
1294 			u64_stats_update_end(&port->tx_stats_syncp);
1295 			return NETDEV_TX_BUSY;
1296 		}
1297 	}
1298 
1299 	if (gmac_map_tx_bufs(netdev, skb, txq, &w)) {
1300 		if (skb_linearize(skb))
1301 			goto out_drop;
1302 
1303 		u64_stats_update_begin(&port->tx_stats_syncp);
1304 		port->tx_frags_linearized++;
1305 		u64_stats_update_end(&port->tx_stats_syncp);
1306 
1307 		if (gmac_map_tx_bufs(netdev, skb, txq, &w))
1308 			goto out_drop_free;
1309 	}
1310 
1311 	writew(w, ptr_reg + 2);
1312 
1313 	gmac_clean_txq(netdev, txq, r);
1314 	return NETDEV_TX_OK;
1315 
1316 out_drop_free:
1317 	dev_kfree_skb(skb);
1318 out_drop:
1319 	u64_stats_update_begin(&port->tx_stats_syncp);
1320 	port->stats.tx_dropped++;
1321 	u64_stats_update_end(&port->tx_stats_syncp);
1322 	return NETDEV_TX_OK;
1323 }
1324 
gmac_tx_timeout(struct net_device * netdev,unsigned int txqueue)1325 static void gmac_tx_timeout(struct net_device *netdev, unsigned int txqueue)
1326 {
1327 	netdev_err(netdev, "Tx timeout\n");
1328 	gmac_dump_dma_state(netdev);
1329 }
1330 
gmac_enable_irq(struct net_device * netdev,int enable)1331 static void gmac_enable_irq(struct net_device *netdev, int enable)
1332 {
1333 	struct gemini_ethernet_port *port = netdev_priv(netdev);
1334 	struct gemini_ethernet *geth = port->geth;
1335 	unsigned long flags;
1336 	u32 val, mask;
1337 
1338 	netdev_dbg(netdev, "%s device %d %s\n", __func__,
1339 		   netdev->dev_id, enable ? "enable" : "disable");
1340 	spin_lock_irqsave(&geth->irq_lock, flags);
1341 
1342 	mask = GMAC0_IRQ0_2 << (netdev->dev_id * 2);
1343 	val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
1344 	val = enable ? (val | mask) : (val & ~mask);
1345 	writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
1346 
1347 	mask = DEFAULT_Q0_INT_BIT << netdev->dev_id;
1348 	val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG);
1349 	val = enable ? (val | mask) : (val & ~mask);
1350 	writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG);
1351 
1352 	mask = GMAC0_IRQ4_8 << (netdev->dev_id * 8);
1353 	val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
1354 	val = enable ? (val | mask) : (val & ~mask);
1355 	writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
1356 
1357 	spin_unlock_irqrestore(&geth->irq_lock, flags);
1358 }
1359 
gmac_enable_rx_irq(struct net_device * netdev,int enable)1360 static void gmac_enable_rx_irq(struct net_device *netdev, int enable)
1361 {
1362 	struct gemini_ethernet_port *port = netdev_priv(netdev);
1363 	struct gemini_ethernet *geth = port->geth;
1364 	unsigned long flags;
1365 	u32 val, mask;
1366 
1367 	netdev_dbg(netdev, "%s device %d %s\n", __func__, netdev->dev_id,
1368 		   enable ? "enable" : "disable");
1369 	spin_lock_irqsave(&geth->irq_lock, flags);
1370 	mask = DEFAULT_Q0_INT_BIT << netdev->dev_id;
1371 
1372 	val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG);
1373 	val = enable ? (val | mask) : (val & ~mask);
1374 	writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG);
1375 
1376 	spin_unlock_irqrestore(&geth->irq_lock, flags);
1377 }
1378 
gmac_skb_if_good_frame(struct gemini_ethernet_port * port,union gmac_rxdesc_0 word0,unsigned int frame_len)1379 static struct sk_buff *gmac_skb_if_good_frame(struct gemini_ethernet_port *port,
1380 					      union gmac_rxdesc_0 word0,
1381 					      unsigned int frame_len)
1382 {
1383 	unsigned int rx_csum = word0.bits.chksum_status;
1384 	unsigned int rx_status = word0.bits.status;
1385 	struct sk_buff *skb = NULL;
1386 
1387 	port->rx_stats[rx_status]++;
1388 	port->rx_csum_stats[rx_csum]++;
1389 
1390 	if (word0.bits.derr || word0.bits.perr ||
1391 	    rx_status || frame_len < ETH_ZLEN ||
1392 	    rx_csum >= RX_CHKSUM_IP_ERR_UNKNOWN) {
1393 		port->stats.rx_errors++;
1394 
1395 		if (frame_len < ETH_ZLEN || RX_ERROR_LENGTH(rx_status))
1396 			port->stats.rx_length_errors++;
1397 		if (RX_ERROR_OVER(rx_status))
1398 			port->stats.rx_over_errors++;
1399 		if (RX_ERROR_CRC(rx_status))
1400 			port->stats.rx_crc_errors++;
1401 		if (RX_ERROR_FRAME(rx_status))
1402 			port->stats.rx_frame_errors++;
1403 		return NULL;
1404 	}
1405 
1406 	skb = napi_get_frags(&port->napi);
1407 	if (!skb)
1408 		goto update_exit;
1409 
1410 	if (rx_csum == RX_CHKSUM_IP_UDP_TCP_OK)
1411 		skb->ip_summed = CHECKSUM_UNNECESSARY;
1412 
1413 update_exit:
1414 	port->stats.rx_bytes += frame_len;
1415 	port->stats.rx_packets++;
1416 	return skb;
1417 }
1418 
gmac_rx(struct net_device * netdev,unsigned int budget)1419 static unsigned int gmac_rx(struct net_device *netdev, unsigned int budget)
1420 {
1421 	struct gemini_ethernet_port *port = netdev_priv(netdev);
1422 	unsigned short m = (1 << port->rxq_order) - 1;
1423 	struct gemini_ethernet *geth = port->geth;
1424 	void __iomem *ptr_reg = port->rxq_rwptr;
1425 	unsigned int frame_len, frag_len;
1426 	struct gmac_rxdesc *rx = NULL;
1427 	struct gmac_queue_page *gpage;
1428 	static struct sk_buff *skb;
1429 	union gmac_rxdesc_0 word0;
1430 	union gmac_rxdesc_1 word1;
1431 	union gmac_rxdesc_3 word3;
1432 	struct page *page = NULL;
1433 	unsigned int page_offs;
1434 	unsigned long flags;
1435 	unsigned short r, w;
1436 	union dma_rwptr rw;
1437 	dma_addr_t mapping;
1438 	int frag_nr = 0;
1439 
1440 	spin_lock_irqsave(&geth->irq_lock, flags);
1441 	rw.bits32 = readl(ptr_reg);
1442 	/* Reset interrupt as all packages until here are taken into account */
1443 	writel(DEFAULT_Q0_INT_BIT << netdev->dev_id,
1444 	       geth->base + GLOBAL_INTERRUPT_STATUS_1_REG);
1445 	spin_unlock_irqrestore(&geth->irq_lock, flags);
1446 
1447 	r = rw.bits.rptr;
1448 	w = rw.bits.wptr;
1449 
1450 	while (budget && w != r) {
1451 		rx = port->rxq_ring + r;
1452 		word0 = rx->word0;
1453 		word1 = rx->word1;
1454 		mapping = rx->word2.buf_adr;
1455 		word3 = rx->word3;
1456 
1457 		r++;
1458 		r &= m;
1459 
1460 		frag_len = word0.bits.buffer_size;
1461 		frame_len = word1.bits.byte_count;
1462 		page_offs = mapping & ~PAGE_MASK;
1463 
1464 		if (!mapping) {
1465 			netdev_err(netdev,
1466 				   "rxq[%u]: HW BUG: zero DMA desc\n", r);
1467 			goto err_drop;
1468 		}
1469 
1470 		/* Freeq pointers are one page off */
1471 		gpage = gmac_get_queue_page(geth, port, mapping + PAGE_SIZE);
1472 		if (!gpage) {
1473 			dev_err(geth->dev, "could not find mapping\n");
1474 			continue;
1475 		}
1476 		page = gpage->page;
1477 
1478 		if (word3.bits32 & SOF_BIT) {
1479 			if (skb) {
1480 				napi_free_frags(&port->napi);
1481 				port->stats.rx_dropped++;
1482 			}
1483 
1484 			skb = gmac_skb_if_good_frame(port, word0, frame_len);
1485 			if (!skb)
1486 				goto err_drop;
1487 
1488 			page_offs += NET_IP_ALIGN;
1489 			frag_len -= NET_IP_ALIGN;
1490 			frag_nr = 0;
1491 
1492 		} else if (!skb) {
1493 			put_page(page);
1494 			continue;
1495 		}
1496 
1497 		if (word3.bits32 & EOF_BIT)
1498 			frag_len = frame_len - skb->len;
1499 
1500 		/* append page frag to skb */
1501 		if (frag_nr == MAX_SKB_FRAGS)
1502 			goto err_drop;
1503 
1504 		if (frag_len == 0)
1505 			netdev_err(netdev, "Received fragment with len = 0\n");
1506 
1507 		skb_fill_page_desc(skb, frag_nr, page, page_offs, frag_len);
1508 		skb->len += frag_len;
1509 		skb->data_len += frag_len;
1510 		skb->truesize += frag_len;
1511 		frag_nr++;
1512 
1513 		if (word3.bits32 & EOF_BIT) {
1514 			napi_gro_frags(&port->napi);
1515 			skb = NULL;
1516 			--budget;
1517 		}
1518 		continue;
1519 
1520 err_drop:
1521 		if (skb) {
1522 			napi_free_frags(&port->napi);
1523 			skb = NULL;
1524 		}
1525 
1526 		if (mapping)
1527 			put_page(page);
1528 
1529 		port->stats.rx_dropped++;
1530 	}
1531 
1532 	writew(r, ptr_reg);
1533 	return budget;
1534 }
1535 
gmac_napi_poll(struct napi_struct * napi,int budget)1536 static int gmac_napi_poll(struct napi_struct *napi, int budget)
1537 {
1538 	struct gemini_ethernet_port *port = netdev_priv(napi->dev);
1539 	struct gemini_ethernet *geth = port->geth;
1540 	unsigned int freeq_threshold;
1541 	unsigned int received;
1542 
1543 	freeq_threshold = 1 << (geth->freeq_order - 1);
1544 	u64_stats_update_begin(&port->rx_stats_syncp);
1545 
1546 	received = gmac_rx(napi->dev, budget);
1547 	if (received < budget) {
1548 		napi_gro_flush(napi, false);
1549 		napi_complete_done(napi, received);
1550 		gmac_enable_rx_irq(napi->dev, 1);
1551 		++port->rx_napi_exits;
1552 	}
1553 
1554 	port->freeq_refill += (budget - received);
1555 	if (port->freeq_refill > freeq_threshold) {
1556 		port->freeq_refill -= freeq_threshold;
1557 		geth_fill_freeq(geth, true);
1558 	}
1559 
1560 	u64_stats_update_end(&port->rx_stats_syncp);
1561 	return received;
1562 }
1563 
gmac_dump_dma_state(struct net_device * netdev)1564 static void gmac_dump_dma_state(struct net_device *netdev)
1565 {
1566 	struct gemini_ethernet_port *port = netdev_priv(netdev);
1567 	struct gemini_ethernet *geth = port->geth;
1568 	void __iomem *ptr_reg;
1569 	u32 reg[5];
1570 
1571 	/* Interrupt status */
1572 	reg[0] = readl(geth->base + GLOBAL_INTERRUPT_STATUS_0_REG);
1573 	reg[1] = readl(geth->base + GLOBAL_INTERRUPT_STATUS_1_REG);
1574 	reg[2] = readl(geth->base + GLOBAL_INTERRUPT_STATUS_2_REG);
1575 	reg[3] = readl(geth->base + GLOBAL_INTERRUPT_STATUS_3_REG);
1576 	reg[4] = readl(geth->base + GLOBAL_INTERRUPT_STATUS_4_REG);
1577 	netdev_err(netdev, "IRQ status: 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x\n",
1578 		   reg[0], reg[1], reg[2], reg[3], reg[4]);
1579 
1580 	/* Interrupt enable */
1581 	reg[0] = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
1582 	reg[1] = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_1_REG);
1583 	reg[2] = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_2_REG);
1584 	reg[3] = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_3_REG);
1585 	reg[4] = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_4_REG);
1586 	netdev_err(netdev, "IRQ enable: 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x\n",
1587 		   reg[0], reg[1], reg[2], reg[3], reg[4]);
1588 
1589 	/* RX DMA status */
1590 	reg[0] = readl(port->dma_base + GMAC_DMA_RX_FIRST_DESC_REG);
1591 	reg[1] = readl(port->dma_base + GMAC_DMA_RX_CURR_DESC_REG);
1592 	reg[2] = GET_RPTR(port->rxq_rwptr);
1593 	reg[3] = GET_WPTR(port->rxq_rwptr);
1594 	netdev_err(netdev, "RX DMA regs: 0x%08x 0x%08x, ptr: %u %u\n",
1595 		   reg[0], reg[1], reg[2], reg[3]);
1596 
1597 	reg[0] = readl(port->dma_base + GMAC_DMA_RX_DESC_WORD0_REG);
1598 	reg[1] = readl(port->dma_base + GMAC_DMA_RX_DESC_WORD1_REG);
1599 	reg[2] = readl(port->dma_base + GMAC_DMA_RX_DESC_WORD2_REG);
1600 	reg[3] = readl(port->dma_base + GMAC_DMA_RX_DESC_WORD3_REG);
1601 	netdev_err(netdev, "RX DMA descriptor: 0x%08x 0x%08x 0x%08x 0x%08x\n",
1602 		   reg[0], reg[1], reg[2], reg[3]);
1603 
1604 	/* TX DMA status */
1605 	ptr_reg = port->dma_base + GMAC_SW_TX_QUEUE0_PTR_REG;
1606 
1607 	reg[0] = readl(port->dma_base + GMAC_DMA_TX_FIRST_DESC_REG);
1608 	reg[1] = readl(port->dma_base + GMAC_DMA_TX_CURR_DESC_REG);
1609 	reg[2] = GET_RPTR(ptr_reg);
1610 	reg[3] = GET_WPTR(ptr_reg);
1611 	netdev_err(netdev, "TX DMA regs: 0x%08x 0x%08x, ptr: %u %u\n",
1612 		   reg[0], reg[1], reg[2], reg[3]);
1613 
1614 	reg[0] = readl(port->dma_base + GMAC_DMA_TX_DESC_WORD0_REG);
1615 	reg[1] = readl(port->dma_base + GMAC_DMA_TX_DESC_WORD1_REG);
1616 	reg[2] = readl(port->dma_base + GMAC_DMA_TX_DESC_WORD2_REG);
1617 	reg[3] = readl(port->dma_base + GMAC_DMA_TX_DESC_WORD3_REG);
1618 	netdev_err(netdev, "TX DMA descriptor: 0x%08x 0x%08x 0x%08x 0x%08x\n",
1619 		   reg[0], reg[1], reg[2], reg[3]);
1620 
1621 	/* FREE queues status */
1622 	ptr_reg = geth->base + GLOBAL_SWFQ_RWPTR_REG;
1623 
1624 	reg[0] = GET_RPTR(ptr_reg);
1625 	reg[1] = GET_WPTR(ptr_reg);
1626 
1627 	ptr_reg = geth->base + GLOBAL_HWFQ_RWPTR_REG;
1628 
1629 	reg[2] = GET_RPTR(ptr_reg);
1630 	reg[3] = GET_WPTR(ptr_reg);
1631 	netdev_err(netdev, "FQ SW ptr: %u %u, HW ptr: %u %u\n",
1632 		   reg[0], reg[1], reg[2], reg[3]);
1633 }
1634 
gmac_update_hw_stats(struct net_device * netdev)1635 static void gmac_update_hw_stats(struct net_device *netdev)
1636 {
1637 	struct gemini_ethernet_port *port = netdev_priv(netdev);
1638 	unsigned int rx_discards, rx_mcast, rx_bcast;
1639 	struct gemini_ethernet *geth = port->geth;
1640 	unsigned long flags;
1641 
1642 	spin_lock_irqsave(&geth->irq_lock, flags);
1643 	u64_stats_update_begin(&port->ir_stats_syncp);
1644 
1645 	rx_discards = readl(port->gmac_base + GMAC_IN_DISCARDS);
1646 	port->hw_stats[0] += rx_discards;
1647 	port->hw_stats[1] += readl(port->gmac_base + GMAC_IN_ERRORS);
1648 	rx_mcast = readl(port->gmac_base + GMAC_IN_MCAST);
1649 	port->hw_stats[2] += rx_mcast;
1650 	rx_bcast = readl(port->gmac_base + GMAC_IN_BCAST);
1651 	port->hw_stats[3] += rx_bcast;
1652 	port->hw_stats[4] += readl(port->gmac_base + GMAC_IN_MAC1);
1653 	port->hw_stats[5] += readl(port->gmac_base + GMAC_IN_MAC2);
1654 
1655 	port->stats.rx_missed_errors += rx_discards;
1656 	port->stats.multicast += rx_mcast;
1657 	port->stats.multicast += rx_bcast;
1658 
1659 	writel(GMAC0_MIB_INT_BIT << (netdev->dev_id * 8),
1660 	       geth->base + GLOBAL_INTERRUPT_STATUS_4_REG);
1661 
1662 	u64_stats_update_end(&port->ir_stats_syncp);
1663 	spin_unlock_irqrestore(&geth->irq_lock, flags);
1664 }
1665 
1666 /**
1667  * gmac_get_intr_flags() - get interrupt status flags for a port from
1668  * @netdev: the net device for the port to get flags from
1669  * @i: the interrupt status register 0..4
1670  */
gmac_get_intr_flags(struct net_device * netdev,int i)1671 static u32 gmac_get_intr_flags(struct net_device *netdev, int i)
1672 {
1673 	struct gemini_ethernet_port *port = netdev_priv(netdev);
1674 	struct gemini_ethernet *geth = port->geth;
1675 	void __iomem *irqif_reg, *irqen_reg;
1676 	unsigned int offs, val;
1677 
1678 	/* Calculate the offset using the stride of the status registers */
1679 	offs = i * (GLOBAL_INTERRUPT_STATUS_1_REG -
1680 		    GLOBAL_INTERRUPT_STATUS_0_REG);
1681 
1682 	irqif_reg = geth->base + GLOBAL_INTERRUPT_STATUS_0_REG + offs;
1683 	irqen_reg = geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG + offs;
1684 
1685 	val = readl(irqif_reg) & readl(irqen_reg);
1686 	return val;
1687 }
1688 
gmac_coalesce_delay_expired(struct hrtimer * timer)1689 static enum hrtimer_restart gmac_coalesce_delay_expired(struct hrtimer *timer)
1690 {
1691 	struct gemini_ethernet_port *port =
1692 		container_of(timer, struct gemini_ethernet_port,
1693 			     rx_coalesce_timer);
1694 
1695 	napi_schedule(&port->napi);
1696 	return HRTIMER_NORESTART;
1697 }
1698 
gmac_irq(int irq,void * data)1699 static irqreturn_t gmac_irq(int irq, void *data)
1700 {
1701 	struct gemini_ethernet_port *port;
1702 	struct net_device *netdev = data;
1703 	struct gemini_ethernet *geth;
1704 	u32 val, orr = 0;
1705 
1706 	port = netdev_priv(netdev);
1707 	geth = port->geth;
1708 
1709 	val = gmac_get_intr_flags(netdev, 0);
1710 	orr |= val;
1711 
1712 	if (val & (GMAC0_IRQ0_2 << (netdev->dev_id * 2))) {
1713 		/* Oh, crap */
1714 		netdev_err(netdev, "hw failure/sw bug\n");
1715 		gmac_dump_dma_state(netdev);
1716 
1717 		/* don't know how to recover, just reduce losses */
1718 		gmac_enable_irq(netdev, 0);
1719 		return IRQ_HANDLED;
1720 	}
1721 
1722 	if (val & (GMAC0_IRQ0_TXQ0_INTS << (netdev->dev_id * 6)))
1723 		gmac_tx_irq(netdev, 0);
1724 
1725 	val = gmac_get_intr_flags(netdev, 1);
1726 	orr |= val;
1727 
1728 	if (val & (DEFAULT_Q0_INT_BIT << netdev->dev_id)) {
1729 		gmac_enable_rx_irq(netdev, 0);
1730 
1731 		if (!port->rx_coalesce_nsecs) {
1732 			napi_schedule(&port->napi);
1733 		} else {
1734 			ktime_t ktime;
1735 
1736 			ktime = ktime_set(0, port->rx_coalesce_nsecs);
1737 			hrtimer_start(&port->rx_coalesce_timer, ktime,
1738 				      HRTIMER_MODE_REL);
1739 		}
1740 	}
1741 
1742 	val = gmac_get_intr_flags(netdev, 4);
1743 	orr |= val;
1744 
1745 	if (val & (GMAC0_MIB_INT_BIT << (netdev->dev_id * 8)))
1746 		gmac_update_hw_stats(netdev);
1747 
1748 	if (val & (GMAC0_RX_OVERRUN_INT_BIT << (netdev->dev_id * 8))) {
1749 		spin_lock(&geth->irq_lock);
1750 		writel(GMAC0_RXDERR_INT_BIT << (netdev->dev_id * 8),
1751 		       geth->base + GLOBAL_INTERRUPT_STATUS_4_REG);
1752 		u64_stats_update_begin(&port->ir_stats_syncp);
1753 		++port->stats.rx_fifo_errors;
1754 		u64_stats_update_end(&port->ir_stats_syncp);
1755 		spin_unlock(&geth->irq_lock);
1756 	}
1757 
1758 	return orr ? IRQ_HANDLED : IRQ_NONE;
1759 }
1760 
gmac_start_dma(struct gemini_ethernet_port * port)1761 static void gmac_start_dma(struct gemini_ethernet_port *port)
1762 {
1763 	void __iomem *dma_ctrl_reg = port->dma_base + GMAC_DMA_CTRL_REG;
1764 	union gmac_dma_ctrl dma_ctrl;
1765 
1766 	dma_ctrl.bits32 = readl(dma_ctrl_reg);
1767 	dma_ctrl.bits.rd_enable = 1;
1768 	dma_ctrl.bits.td_enable = 1;
1769 	dma_ctrl.bits.loopback = 0;
1770 	dma_ctrl.bits.drop_small_ack = 0;
1771 	dma_ctrl.bits.rd_insert_bytes = NET_IP_ALIGN;
1772 	dma_ctrl.bits.rd_prot = HPROT_DATA_CACHE | HPROT_PRIVILIGED;
1773 	dma_ctrl.bits.rd_burst_size = HBURST_INCR8;
1774 	dma_ctrl.bits.rd_bus = HSIZE_8;
1775 	dma_ctrl.bits.td_prot = HPROT_DATA_CACHE;
1776 	dma_ctrl.bits.td_burst_size = HBURST_INCR8;
1777 	dma_ctrl.bits.td_bus = HSIZE_8;
1778 
1779 	writel(dma_ctrl.bits32, dma_ctrl_reg);
1780 }
1781 
gmac_stop_dma(struct gemini_ethernet_port * port)1782 static void gmac_stop_dma(struct gemini_ethernet_port *port)
1783 {
1784 	void __iomem *dma_ctrl_reg = port->dma_base + GMAC_DMA_CTRL_REG;
1785 	union gmac_dma_ctrl dma_ctrl;
1786 
1787 	dma_ctrl.bits32 = readl(dma_ctrl_reg);
1788 	dma_ctrl.bits.rd_enable = 0;
1789 	dma_ctrl.bits.td_enable = 0;
1790 	writel(dma_ctrl.bits32, dma_ctrl_reg);
1791 }
1792 
gmac_open(struct net_device * netdev)1793 static int gmac_open(struct net_device *netdev)
1794 {
1795 	struct gemini_ethernet_port *port = netdev_priv(netdev);
1796 	int err;
1797 
1798 	err = request_irq(netdev->irq, gmac_irq,
1799 			  IRQF_SHARED, netdev->name, netdev);
1800 	if (err) {
1801 		netdev_err(netdev, "no IRQ\n");
1802 		return err;
1803 	}
1804 
1805 	netif_carrier_off(netdev);
1806 	phy_start(netdev->phydev);
1807 
1808 	err = geth_resize_freeq(port);
1809 	/* It's fine if it's just busy, the other port has set up
1810 	 * the freeq in that case.
1811 	 */
1812 	if (err && (err != -EBUSY)) {
1813 		netdev_err(netdev, "could not resize freeq\n");
1814 		goto err_stop_phy;
1815 	}
1816 
1817 	err = gmac_setup_rxq(netdev);
1818 	if (err) {
1819 		netdev_err(netdev, "could not setup RXQ\n");
1820 		goto err_stop_phy;
1821 	}
1822 
1823 	err = gmac_setup_txqs(netdev);
1824 	if (err) {
1825 		netdev_err(netdev, "could not setup TXQs\n");
1826 		gmac_cleanup_rxq(netdev);
1827 		goto err_stop_phy;
1828 	}
1829 
1830 	napi_enable(&port->napi);
1831 
1832 	gmac_start_dma(port);
1833 	gmac_enable_irq(netdev, 1);
1834 	gmac_enable_tx_rx(netdev);
1835 	netif_tx_start_all_queues(netdev);
1836 
1837 	hrtimer_setup(&port->rx_coalesce_timer, &gmac_coalesce_delay_expired, CLOCK_MONOTONIC,
1838 		      HRTIMER_MODE_REL);
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 
gmac_stop(struct net_device * netdev)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 
gmac_set_rx_mode(struct net_device * netdev)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 
gmac_write_mac_address(struct net_device * netdev)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 
gmac_set_mac_address(struct net_device * netdev,void * addr)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 
gmac_clear_hw_stats(struct net_device * netdev)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 
gmac_get_stats64(struct net_device * netdev,struct rtnl_link_stats64 * stats)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 
gmac_change_mtu(struct net_device * netdev,int new_mtu)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 
gmac_set_features(struct net_device * netdev,netdev_features_t features)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 
gmac_get_sset_count(struct net_device * netdev,int sset)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 
gmac_get_strings(struct net_device * netdev,u32 stringset,u8 * data)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 
gmac_get_ethtool_stats(struct net_device * netdev,struct ethtool_stats * estats,u64 * values)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 
gmac_get_ksettings(struct net_device * netdev,struct ethtool_link_ksettings * cmd)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 
gmac_set_ksettings(struct net_device * netdev,const struct ethtool_link_ksettings * cmd)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 
gmac_nway_reset(struct net_device * netdev)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 
gmac_get_pauseparam(struct net_device * netdev,struct ethtool_pauseparam * pparam)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 
gmac_set_pauseparam(struct net_device * netdev,struct ethtool_pauseparam * pparam)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 
gmac_get_ringparam(struct net_device * netdev,struct ethtool_ringparam * rp,struct kernel_ethtool_ringparam * kernel_rp,struct netlink_ext_ack * extack)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 
gmac_set_ringparam(struct net_device * netdev,struct ethtool_ringparam * rp,struct kernel_ethtool_ringparam * kernel_rp,struct netlink_ext_ack * extack)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 
gmac_get_coalesce(struct net_device * netdev,struct ethtool_coalesce * ecmd,struct kernel_ethtool_coalesce * kernel_coal,struct netlink_ext_ack * extack)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 
gmac_set_coalesce(struct net_device * netdev,struct ethtool_coalesce * ecmd,struct kernel_ethtool_coalesce * kernel_coal,struct netlink_ext_ack * extack)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 
gmac_get_msglevel(struct net_device * netdev)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 
gmac_set_msglevel(struct net_device * netdev,u32 level)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 
gmac_get_drvinfo(struct net_device * netdev,struct ethtool_drvinfo * info)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 
gemini_port_irq_thread(int irq,void * data)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 
gemini_port_irq(int irq,void * data)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 
gemini_port_remove(struct gemini_ethernet_port * port)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 
gemini_ethernet_init(struct gemini_ethernet * geth)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 
gemini_port_save_mac_addr(struct gemini_ethernet_port * port)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 
gemini_ethernet_port_probe(struct platform_device * pdev)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 
gemini_ethernet_port_remove(struct platform_device * pdev)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 
gemini_ethernet_probe(struct platform_device * pdev)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 
gemini_ethernet_remove(struct platform_device * pdev)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 
gemini_ethernet_module_init(void)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 
gemini_ethernet_module_exit(void)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);
2672