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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi...
[deliverable/linux.git] / drivers / net / ethernet / xilinx / ll_temac_main.c
1 /*
2 * Driver for Xilinx TEMAC Ethernet device
3 *
4 * Copyright (c) 2008 Nissin Systems Co., Ltd., Yoshio Kashiwagi
5 * Copyright (c) 2005-2008 DLA Systems, David H. Lynch Jr. <dhlii@dlasys.net>
6 * Copyright (c) 2008-2009 Secret Lab Technologies Ltd.
7 *
8 * This is a driver for the Xilinx ll_temac ipcore which is often used
9 * in the Virtex and Spartan series of chips.
10 *
11 * Notes:
12 * - The ll_temac hardware uses indirect access for many of the TEMAC
13 * registers, include the MDIO bus. However, indirect access to MDIO
14 * registers take considerably more clock cycles than to TEMAC registers.
15 * MDIO accesses are long, so threads doing them should probably sleep
16 * rather than busywait. However, since only one indirect access can be
17 * in progress at any given time, that means that *all* indirect accesses
18 * could end up sleeping (to wait for an MDIO access to complete).
19 * Fortunately none of the indirect accesses are on the 'hot' path for tx
20 * or rx, so this should be okay.
21 *
22 * TODO:
23 * - Factor out locallink DMA code into separate driver
24 * - Fix multicast assignment.
25 * - Fix support for hardware checksumming.
26 * - Testing. Lots and lots of testing.
27 *
28 */
29
30 #include <linux/delay.h>
31 #include <linux/etherdevice.h>
32 #include <linux/init.h>
33 #include <linux/mii.h>
34 #include <linux/module.h>
35 #include <linux/mutex.h>
36 #include <linux/netdevice.h>
37 #include <linux/of.h>
38 #include <linux/of_device.h>
39 #include <linux/of_mdio.h>
40 #include <linux/of_platform.h>
41 #include <linux/of_address.h>
42 #include <linux/skbuff.h>
43 #include <linux/spinlock.h>
44 #include <linux/tcp.h> /* needed for sizeof(tcphdr) */
45 #include <linux/udp.h> /* needed for sizeof(udphdr) */
46 #include <linux/phy.h>
47 #include <linux/in.h>
48 #include <linux/io.h>
49 #include <linux/ip.h>
50 #include <linux/slab.h>
51 #include <linux/interrupt.h>
52 #include <linux/dma-mapping.h>
53
54 #include "ll_temac.h"
55
56 #define TX_BD_NUM 64
57 #define RX_BD_NUM 128
58
59 /* ---------------------------------------------------------------------
60 * Low level register access functions
61 */
62
63 u32 temac_ior(struct temac_local *lp, int offset)
64 {
65 return in_be32((u32 *)(lp->regs + offset));
66 }
67
68 void temac_iow(struct temac_local *lp, int offset, u32 value)
69 {
70 out_be32((u32 *) (lp->regs + offset), value);
71 }
72
73 int temac_indirect_busywait(struct temac_local *lp)
74 {
75 long end = jiffies + 2;
76
77 while (!(temac_ior(lp, XTE_RDY0_OFFSET) & XTE_RDY0_HARD_ACS_RDY_MASK)) {
78 if (end - jiffies <= 0) {
79 WARN_ON(1);
80 return -ETIMEDOUT;
81 }
82 msleep(1);
83 }
84 return 0;
85 }
86
87 /**
88 * temac_indirect_in32
89 *
90 * lp->indirect_mutex must be held when calling this function
91 */
92 u32 temac_indirect_in32(struct temac_local *lp, int reg)
93 {
94 u32 val;
95
96 if (temac_indirect_busywait(lp))
97 return -ETIMEDOUT;
98 temac_iow(lp, XTE_CTL0_OFFSET, reg);
99 if (temac_indirect_busywait(lp))
100 return -ETIMEDOUT;
101 val = temac_ior(lp, XTE_LSW0_OFFSET);
102
103 return val;
104 }
105
106 /**
107 * temac_indirect_out32
108 *
109 * lp->indirect_mutex must be held when calling this function
110 */
111 void temac_indirect_out32(struct temac_local *lp, int reg, u32 value)
112 {
113 if (temac_indirect_busywait(lp))
114 return;
115 temac_iow(lp, XTE_LSW0_OFFSET, value);
116 temac_iow(lp, XTE_CTL0_OFFSET, CNTLREG_WRITE_ENABLE_MASK | reg);
117 temac_indirect_busywait(lp);
118 }
119
120 /**
121 * temac_dma_in32 - Memory mapped DMA read, this function expects a
122 * register input that is based on DCR word addresses which
123 * are then converted to memory mapped byte addresses
124 */
125 static u32 temac_dma_in32(struct temac_local *lp, int reg)
126 {
127 return in_be32((u32 *)(lp->sdma_regs + (reg << 2)));
128 }
129
130 /**
131 * temac_dma_out32 - Memory mapped DMA read, this function expects a
132 * register input that is based on DCR word addresses which
133 * are then converted to memory mapped byte addresses
134 */
135 static void temac_dma_out32(struct temac_local *lp, int reg, u32 value)
136 {
137 out_be32((u32 *)(lp->sdma_regs + (reg << 2)), value);
138 }
139
140 /* DMA register access functions can be DCR based or memory mapped.
141 * The PowerPC 440 is DCR based, the PowerPC 405 and MicroBlaze are both
142 * memory mapped.
143 */
144 #ifdef CONFIG_PPC_DCR
145
146 /**
147 * temac_dma_dcr_in32 - DCR based DMA read
148 */
149 static u32 temac_dma_dcr_in(struct temac_local *lp, int reg)
150 {
151 return dcr_read(lp->sdma_dcrs, reg);
152 }
153
154 /**
155 * temac_dma_dcr_out32 - DCR based DMA write
156 */
157 static void temac_dma_dcr_out(struct temac_local *lp, int reg, u32 value)
158 {
159 dcr_write(lp->sdma_dcrs, reg, value);
160 }
161
162 /**
163 * temac_dcr_setup - If the DMA is DCR based, then setup the address and
164 * I/O functions
165 */
166 static int temac_dcr_setup(struct temac_local *lp, struct platform_device *op,
167 struct device_node *np)
168 {
169 unsigned int dcrs;
170
171 /* setup the dcr address mapping if it's in the device tree */
172
173 dcrs = dcr_resource_start(np, 0);
174 if (dcrs != 0) {
175 lp->sdma_dcrs = dcr_map(np, dcrs, dcr_resource_len(np, 0));
176 lp->dma_in = temac_dma_dcr_in;
177 lp->dma_out = temac_dma_dcr_out;
178 dev_dbg(&op->dev, "DCR base: %x\n", dcrs);
179 return 0;
180 }
181 /* no DCR in the device tree, indicate a failure */
182 return -1;
183 }
184
185 #else
186
187 /*
188 * temac_dcr_setup - This is a stub for when DCR is not supported,
189 * such as with MicroBlaze
190 */
191 static int temac_dcr_setup(struct temac_local *lp, struct platform_device *op,
192 struct device_node *np)
193 {
194 return -1;
195 }
196
197 #endif
198
199 /**
200 * * temac_dma_bd_release - Release buffer descriptor rings
201 */
202 static void temac_dma_bd_release(struct net_device *ndev)
203 {
204 struct temac_local *lp = netdev_priv(ndev);
205 int i;
206
207 /* Reset Local Link (DMA) */
208 lp->dma_out(lp, DMA_CONTROL_REG, DMA_CONTROL_RST);
209
210 for (i = 0; i < RX_BD_NUM; i++) {
211 if (!lp->rx_skb[i])
212 break;
213 else {
214 dma_unmap_single(ndev->dev.parent, lp->rx_bd_v[i].phys,
215 XTE_MAX_JUMBO_FRAME_SIZE, DMA_FROM_DEVICE);
216 dev_kfree_skb(lp->rx_skb[i]);
217 }
218 }
219 if (lp->rx_bd_v)
220 dma_free_coherent(ndev->dev.parent,
221 sizeof(*lp->rx_bd_v) * RX_BD_NUM,
222 lp->rx_bd_v, lp->rx_bd_p);
223 if (lp->tx_bd_v)
224 dma_free_coherent(ndev->dev.parent,
225 sizeof(*lp->tx_bd_v) * TX_BD_NUM,
226 lp->tx_bd_v, lp->tx_bd_p);
227 if (lp->rx_skb)
228 kfree(lp->rx_skb);
229 }
230
231 /**
232 * temac_dma_bd_init - Setup buffer descriptor rings
233 */
234 static int temac_dma_bd_init(struct net_device *ndev)
235 {
236 struct temac_local *lp = netdev_priv(ndev);
237 struct sk_buff *skb;
238 int i;
239
240 lp->rx_skb = kcalloc(RX_BD_NUM, sizeof(*lp->rx_skb), GFP_KERNEL);
241 if (!lp->rx_skb) {
242 dev_err(&ndev->dev,
243 "can't allocate memory for DMA RX buffer\n");
244 goto out;
245 }
246 /* allocate the tx and rx ring buffer descriptors. */
247 /* returns a virtual address and a physical address. */
248 lp->tx_bd_v = dma_alloc_coherent(ndev->dev.parent,
249 sizeof(*lp->tx_bd_v) * TX_BD_NUM,
250 &lp->tx_bd_p, GFP_KERNEL);
251 if (!lp->tx_bd_v) {
252 dev_err(&ndev->dev,
253 "unable to allocate DMA TX buffer descriptors");
254 goto out;
255 }
256 lp->rx_bd_v = dma_alloc_coherent(ndev->dev.parent,
257 sizeof(*lp->rx_bd_v) * RX_BD_NUM,
258 &lp->rx_bd_p, GFP_KERNEL);
259 if (!lp->rx_bd_v) {
260 dev_err(&ndev->dev,
261 "unable to allocate DMA RX buffer descriptors");
262 goto out;
263 }
264
265 memset(lp->tx_bd_v, 0, sizeof(*lp->tx_bd_v) * TX_BD_NUM);
266 for (i = 0; i < TX_BD_NUM; i++) {
267 lp->tx_bd_v[i].next = lp->tx_bd_p +
268 sizeof(*lp->tx_bd_v) * ((i + 1) % TX_BD_NUM);
269 }
270
271 memset(lp->rx_bd_v, 0, sizeof(*lp->rx_bd_v) * RX_BD_NUM);
272 for (i = 0; i < RX_BD_NUM; i++) {
273 lp->rx_bd_v[i].next = lp->rx_bd_p +
274 sizeof(*lp->rx_bd_v) * ((i + 1) % RX_BD_NUM);
275
276 skb = netdev_alloc_skb_ip_align(ndev,
277 XTE_MAX_JUMBO_FRAME_SIZE);
278
279 if (skb == 0) {
280 dev_err(&ndev->dev, "alloc_skb error %d\n", i);
281 goto out;
282 }
283 lp->rx_skb[i] = skb;
284 /* returns physical address of skb->data */
285 lp->rx_bd_v[i].phys = dma_map_single(ndev->dev.parent,
286 skb->data,
287 XTE_MAX_JUMBO_FRAME_SIZE,
288 DMA_FROM_DEVICE);
289 lp->rx_bd_v[i].len = XTE_MAX_JUMBO_FRAME_SIZE;
290 lp->rx_bd_v[i].app0 = STS_CTRL_APP0_IRQONEND;
291 }
292
293 lp->dma_out(lp, TX_CHNL_CTRL, 0x10220400 |
294 CHNL_CTRL_IRQ_EN |
295 CHNL_CTRL_IRQ_DLY_EN |
296 CHNL_CTRL_IRQ_COAL_EN);
297 /* 0x10220483 */
298 /* 0x00100483 */
299 lp->dma_out(lp, RX_CHNL_CTRL, 0xff070000 |
300 CHNL_CTRL_IRQ_EN |
301 CHNL_CTRL_IRQ_DLY_EN |
302 CHNL_CTRL_IRQ_COAL_EN |
303 CHNL_CTRL_IRQ_IOE);
304 /* 0xff010283 */
305
306 lp->dma_out(lp, RX_CURDESC_PTR, lp->rx_bd_p);
307 lp->dma_out(lp, RX_TAILDESC_PTR,
308 lp->rx_bd_p + (sizeof(*lp->rx_bd_v) * (RX_BD_NUM - 1)));
309 lp->dma_out(lp, TX_CURDESC_PTR, lp->tx_bd_p);
310
311 return 0;
312
313 out:
314 temac_dma_bd_release(ndev);
315 return -ENOMEM;
316 }
317
318 /* ---------------------------------------------------------------------
319 * net_device_ops
320 */
321
322 static int temac_set_mac_address(struct net_device *ndev, void *address)
323 {
324 struct temac_local *lp = netdev_priv(ndev);
325
326 if (address)
327 memcpy(ndev->dev_addr, address, ETH_ALEN);
328
329 if (!is_valid_ether_addr(ndev->dev_addr))
330 eth_hw_addr_random(ndev);
331 else
332 ndev->addr_assign_type &= ~NET_ADDR_RANDOM;
333
334 /* set up unicast MAC address filter set its mac address */
335 mutex_lock(&lp->indirect_mutex);
336 temac_indirect_out32(lp, XTE_UAW0_OFFSET,
337 (ndev->dev_addr[0]) |
338 (ndev->dev_addr[1] << 8) |
339 (ndev->dev_addr[2] << 16) |
340 (ndev->dev_addr[3] << 24));
341 /* There are reserved bits in EUAW1
342 * so don't affect them Set MAC bits [47:32] in EUAW1 */
343 temac_indirect_out32(lp, XTE_UAW1_OFFSET,
344 (ndev->dev_addr[4] & 0x000000ff) |
345 (ndev->dev_addr[5] << 8));
346 mutex_unlock(&lp->indirect_mutex);
347
348 return 0;
349 }
350
351 static int netdev_set_mac_address(struct net_device *ndev, void *p)
352 {
353 struct sockaddr *addr = p;
354
355 return temac_set_mac_address(ndev, addr->sa_data);
356 }
357
358 static void temac_set_multicast_list(struct net_device *ndev)
359 {
360 struct temac_local *lp = netdev_priv(ndev);
361 u32 multi_addr_msw, multi_addr_lsw, val;
362 int i;
363
364 mutex_lock(&lp->indirect_mutex);
365 if (ndev->flags & (IFF_ALLMULTI | IFF_PROMISC) ||
366 netdev_mc_count(ndev) > MULTICAST_CAM_TABLE_NUM) {
367 /*
368 * We must make the kernel realise we had to move
369 * into promisc mode or we start all out war on
370 * the cable. If it was a promisc request the
371 * flag is already set. If not we assert it.
372 */
373 ndev->flags |= IFF_PROMISC;
374 temac_indirect_out32(lp, XTE_AFM_OFFSET, XTE_AFM_EPPRM_MASK);
375 dev_info(&ndev->dev, "Promiscuous mode enabled.\n");
376 } else if (!netdev_mc_empty(ndev)) {
377 struct netdev_hw_addr *ha;
378
379 i = 0;
380 netdev_for_each_mc_addr(ha, ndev) {
381 if (i >= MULTICAST_CAM_TABLE_NUM)
382 break;
383 multi_addr_msw = ((ha->addr[3] << 24) |
384 (ha->addr[2] << 16) |
385 (ha->addr[1] << 8) |
386 (ha->addr[0]));
387 temac_indirect_out32(lp, XTE_MAW0_OFFSET,
388 multi_addr_msw);
389 multi_addr_lsw = ((ha->addr[5] << 8) |
390 (ha->addr[4]) | (i << 16));
391 temac_indirect_out32(lp, XTE_MAW1_OFFSET,
392 multi_addr_lsw);
393 i++;
394 }
395 } else {
396 val = temac_indirect_in32(lp, XTE_AFM_OFFSET);
397 temac_indirect_out32(lp, XTE_AFM_OFFSET,
398 val & ~XTE_AFM_EPPRM_MASK);
399 temac_indirect_out32(lp, XTE_MAW0_OFFSET, 0);
400 temac_indirect_out32(lp, XTE_MAW1_OFFSET, 0);
401 dev_info(&ndev->dev, "Promiscuous mode disabled.\n");
402 }
403 mutex_unlock(&lp->indirect_mutex);
404 }
405
406 struct temac_option {
407 int flg;
408 u32 opt;
409 u32 reg;
410 u32 m_or;
411 u32 m_and;
412 } temac_options[] = {
413 /* Turn on jumbo packet support for both Rx and Tx */
414 {
415 .opt = XTE_OPTION_JUMBO,
416 .reg = XTE_TXC_OFFSET,
417 .m_or = XTE_TXC_TXJMBO_MASK,
418 },
419 {
420 .opt = XTE_OPTION_JUMBO,
421 .reg = XTE_RXC1_OFFSET,
422 .m_or =XTE_RXC1_RXJMBO_MASK,
423 },
424 /* Turn on VLAN packet support for both Rx and Tx */
425 {
426 .opt = XTE_OPTION_VLAN,
427 .reg = XTE_TXC_OFFSET,
428 .m_or =XTE_TXC_TXVLAN_MASK,
429 },
430 {
431 .opt = XTE_OPTION_VLAN,
432 .reg = XTE_RXC1_OFFSET,
433 .m_or =XTE_RXC1_RXVLAN_MASK,
434 },
435 /* Turn on FCS stripping on receive packets */
436 {
437 .opt = XTE_OPTION_FCS_STRIP,
438 .reg = XTE_RXC1_OFFSET,
439 .m_or =XTE_RXC1_RXFCS_MASK,
440 },
441 /* Turn on FCS insertion on transmit packets */
442 {
443 .opt = XTE_OPTION_FCS_INSERT,
444 .reg = XTE_TXC_OFFSET,
445 .m_or =XTE_TXC_TXFCS_MASK,
446 },
447 /* Turn on length/type field checking on receive packets */
448 {
449 .opt = XTE_OPTION_LENTYPE_ERR,
450 .reg = XTE_RXC1_OFFSET,
451 .m_or =XTE_RXC1_RXLT_MASK,
452 },
453 /* Turn on flow control */
454 {
455 .opt = XTE_OPTION_FLOW_CONTROL,
456 .reg = XTE_FCC_OFFSET,
457 .m_or =XTE_FCC_RXFLO_MASK,
458 },
459 /* Turn on flow control */
460 {
461 .opt = XTE_OPTION_FLOW_CONTROL,
462 .reg = XTE_FCC_OFFSET,
463 .m_or =XTE_FCC_TXFLO_MASK,
464 },
465 /* Turn on promiscuous frame filtering (all frames are received ) */
466 {
467 .opt = XTE_OPTION_PROMISC,
468 .reg = XTE_AFM_OFFSET,
469 .m_or =XTE_AFM_EPPRM_MASK,
470 },
471 /* Enable transmitter if not already enabled */
472 {
473 .opt = XTE_OPTION_TXEN,
474 .reg = XTE_TXC_OFFSET,
475 .m_or =XTE_TXC_TXEN_MASK,
476 },
477 /* Enable receiver? */
478 {
479 .opt = XTE_OPTION_RXEN,
480 .reg = XTE_RXC1_OFFSET,
481 .m_or =XTE_RXC1_RXEN_MASK,
482 },
483 {}
484 };
485
486 /**
487 * temac_setoptions
488 */
489 static u32 temac_setoptions(struct net_device *ndev, u32 options)
490 {
491 struct temac_local *lp = netdev_priv(ndev);
492 struct temac_option *tp = &temac_options[0];
493 int reg;
494
495 mutex_lock(&lp->indirect_mutex);
496 while (tp->opt) {
497 reg = temac_indirect_in32(lp, tp->reg) & ~tp->m_or;
498 if (options & tp->opt)
499 reg |= tp->m_or;
500 temac_indirect_out32(lp, tp->reg, reg);
501 tp++;
502 }
503 lp->options |= options;
504 mutex_unlock(&lp->indirect_mutex);
505
506 return 0;
507 }
508
509 /* Initialize temac */
510 static void temac_device_reset(struct net_device *ndev)
511 {
512 struct temac_local *lp = netdev_priv(ndev);
513 u32 timeout;
514 u32 val;
515
516 /* Perform a software reset */
517
518 /* 0x300 host enable bit ? */
519 /* reset PHY through control register ?:1 */
520
521 dev_dbg(&ndev->dev, "%s()\n", __func__);
522
523 mutex_lock(&lp->indirect_mutex);
524 /* Reset the receiver and wait for it to finish reset */
525 temac_indirect_out32(lp, XTE_RXC1_OFFSET, XTE_RXC1_RXRST_MASK);
526 timeout = 1000;
527 while (temac_indirect_in32(lp, XTE_RXC1_OFFSET) & XTE_RXC1_RXRST_MASK) {
528 udelay(1);
529 if (--timeout == 0) {
530 dev_err(&ndev->dev,
531 "temac_device_reset RX reset timeout!!\n");
532 break;
533 }
534 }
535
536 /* Reset the transmitter and wait for it to finish reset */
537 temac_indirect_out32(lp, XTE_TXC_OFFSET, XTE_TXC_TXRST_MASK);
538 timeout = 1000;
539 while (temac_indirect_in32(lp, XTE_TXC_OFFSET) & XTE_TXC_TXRST_MASK) {
540 udelay(1);
541 if (--timeout == 0) {
542 dev_err(&ndev->dev,
543 "temac_device_reset TX reset timeout!!\n");
544 break;
545 }
546 }
547
548 /* Disable the receiver */
549 val = temac_indirect_in32(lp, XTE_RXC1_OFFSET);
550 temac_indirect_out32(lp, XTE_RXC1_OFFSET, val & ~XTE_RXC1_RXEN_MASK);
551
552 /* Reset Local Link (DMA) */
553 lp->dma_out(lp, DMA_CONTROL_REG, DMA_CONTROL_RST);
554 timeout = 1000;
555 while (lp->dma_in(lp, DMA_CONTROL_REG) & DMA_CONTROL_RST) {
556 udelay(1);
557 if (--timeout == 0) {
558 dev_err(&ndev->dev,
559 "temac_device_reset DMA reset timeout!!\n");
560 break;
561 }
562 }
563 lp->dma_out(lp, DMA_CONTROL_REG, DMA_TAIL_ENABLE);
564
565 if (temac_dma_bd_init(ndev)) {
566 dev_err(&ndev->dev,
567 "temac_device_reset descriptor allocation failed\n");
568 }
569
570 temac_indirect_out32(lp, XTE_RXC0_OFFSET, 0);
571 temac_indirect_out32(lp, XTE_RXC1_OFFSET, 0);
572 temac_indirect_out32(lp, XTE_TXC_OFFSET, 0);
573 temac_indirect_out32(lp, XTE_FCC_OFFSET, XTE_FCC_RXFLO_MASK);
574
575 mutex_unlock(&lp->indirect_mutex);
576
577 /* Sync default options with HW
578 * but leave receiver and transmitter disabled. */
579 temac_setoptions(ndev,
580 lp->options & ~(XTE_OPTION_TXEN | XTE_OPTION_RXEN));
581
582 temac_set_mac_address(ndev, NULL);
583
584 /* Set address filter table */
585 temac_set_multicast_list(ndev);
586 if (temac_setoptions(ndev, lp->options))
587 dev_err(&ndev->dev, "Error setting TEMAC options\n");
588
589 /* Init Driver variable */
590 ndev->trans_start = jiffies; /* prevent tx timeout */
591 }
592
593 void temac_adjust_link(struct net_device *ndev)
594 {
595 struct temac_local *lp = netdev_priv(ndev);
596 struct phy_device *phy = lp->phy_dev;
597 u32 mii_speed;
598 int link_state;
599
600 /* hash together the state values to decide if something has changed */
601 link_state = phy->speed | (phy->duplex << 1) | phy->link;
602
603 mutex_lock(&lp->indirect_mutex);
604 if (lp->last_link != link_state) {
605 mii_speed = temac_indirect_in32(lp, XTE_EMCFG_OFFSET);
606 mii_speed &= ~XTE_EMCFG_LINKSPD_MASK;
607
608 switch (phy->speed) {
609 case SPEED_1000: mii_speed |= XTE_EMCFG_LINKSPD_1000; break;
610 case SPEED_100: mii_speed |= XTE_EMCFG_LINKSPD_100; break;
611 case SPEED_10: mii_speed |= XTE_EMCFG_LINKSPD_10; break;
612 }
613
614 /* Write new speed setting out to TEMAC */
615 temac_indirect_out32(lp, XTE_EMCFG_OFFSET, mii_speed);
616 lp->last_link = link_state;
617 phy_print_status(phy);
618 }
619 mutex_unlock(&lp->indirect_mutex);
620 }
621
622 static void temac_start_xmit_done(struct net_device *ndev)
623 {
624 struct temac_local *lp = netdev_priv(ndev);
625 struct cdmac_bd *cur_p;
626 unsigned int stat = 0;
627
628 cur_p = &lp->tx_bd_v[lp->tx_bd_ci];
629 stat = cur_p->app0;
630
631 while (stat & STS_CTRL_APP0_CMPLT) {
632 dma_unmap_single(ndev->dev.parent, cur_p->phys, cur_p->len,
633 DMA_TO_DEVICE);
634 if (cur_p->app4)
635 dev_kfree_skb_irq((struct sk_buff *)cur_p->app4);
636 cur_p->app0 = 0;
637 cur_p->app1 = 0;
638 cur_p->app2 = 0;
639 cur_p->app3 = 0;
640 cur_p->app4 = 0;
641
642 ndev->stats.tx_packets++;
643 ndev->stats.tx_bytes += cur_p->len;
644
645 lp->tx_bd_ci++;
646 if (lp->tx_bd_ci >= TX_BD_NUM)
647 lp->tx_bd_ci = 0;
648
649 cur_p = &lp->tx_bd_v[lp->tx_bd_ci];
650 stat = cur_p->app0;
651 }
652
653 netif_wake_queue(ndev);
654 }
655
656 static inline int temac_check_tx_bd_space(struct temac_local *lp, int num_frag)
657 {
658 struct cdmac_bd *cur_p;
659 int tail;
660
661 tail = lp->tx_bd_tail;
662 cur_p = &lp->tx_bd_v[tail];
663
664 do {
665 if (cur_p->app0)
666 return NETDEV_TX_BUSY;
667
668 tail++;
669 if (tail >= TX_BD_NUM)
670 tail = 0;
671
672 cur_p = &lp->tx_bd_v[tail];
673 num_frag--;
674 } while (num_frag >= 0);
675
676 return 0;
677 }
678
679 static int temac_start_xmit(struct sk_buff *skb, struct net_device *ndev)
680 {
681 struct temac_local *lp = netdev_priv(ndev);
682 struct cdmac_bd *cur_p;
683 dma_addr_t start_p, tail_p;
684 int ii;
685 unsigned long num_frag;
686 skb_frag_t *frag;
687
688 num_frag = skb_shinfo(skb)->nr_frags;
689 frag = &skb_shinfo(skb)->frags[0];
690 start_p = lp->tx_bd_p + sizeof(*lp->tx_bd_v) * lp->tx_bd_tail;
691 cur_p = &lp->tx_bd_v[lp->tx_bd_tail];
692
693 if (temac_check_tx_bd_space(lp, num_frag)) {
694 if (!netif_queue_stopped(ndev)) {
695 netif_stop_queue(ndev);
696 return NETDEV_TX_BUSY;
697 }
698 return NETDEV_TX_BUSY;
699 }
700
701 cur_p->app0 = 0;
702 if (skb->ip_summed == CHECKSUM_PARTIAL) {
703 unsigned int csum_start_off = skb_checksum_start_offset(skb);
704 unsigned int csum_index_off = csum_start_off + skb->csum_offset;
705
706 cur_p->app0 |= 1; /* TX Checksum Enabled */
707 cur_p->app1 = (csum_start_off << 16) | csum_index_off;
708 cur_p->app2 = 0; /* initial checksum seed */
709 }
710
711 cur_p->app0 |= STS_CTRL_APP0_SOP;
712 cur_p->len = skb_headlen(skb);
713 cur_p->phys = dma_map_single(ndev->dev.parent, skb->data, skb->len,
714 DMA_TO_DEVICE);
715 cur_p->app4 = (unsigned long)skb;
716
717 for (ii = 0; ii < num_frag; ii++) {
718 lp->tx_bd_tail++;
719 if (lp->tx_bd_tail >= TX_BD_NUM)
720 lp->tx_bd_tail = 0;
721
722 cur_p = &lp->tx_bd_v[lp->tx_bd_tail];
723 cur_p->phys = dma_map_single(ndev->dev.parent,
724 skb_frag_address(frag),
725 skb_frag_size(frag), DMA_TO_DEVICE);
726 cur_p->len = skb_frag_size(frag);
727 cur_p->app0 = 0;
728 frag++;
729 }
730 cur_p->app0 |= STS_CTRL_APP0_EOP;
731
732 tail_p = lp->tx_bd_p + sizeof(*lp->tx_bd_v) * lp->tx_bd_tail;
733 lp->tx_bd_tail++;
734 if (lp->tx_bd_tail >= TX_BD_NUM)
735 lp->tx_bd_tail = 0;
736
737 skb_tx_timestamp(skb);
738
739 /* Kick off the transfer */
740 lp->dma_out(lp, TX_TAILDESC_PTR, tail_p); /* DMA start */
741
742 return NETDEV_TX_OK;
743 }
744
745
746 static void ll_temac_recv(struct net_device *ndev)
747 {
748 struct temac_local *lp = netdev_priv(ndev);
749 struct sk_buff *skb, *new_skb;
750 unsigned int bdstat;
751 struct cdmac_bd *cur_p;
752 dma_addr_t tail_p;
753 int length;
754 unsigned long flags;
755
756 spin_lock_irqsave(&lp->rx_lock, flags);
757
758 tail_p = lp->rx_bd_p + sizeof(*lp->rx_bd_v) * lp->rx_bd_ci;
759 cur_p = &lp->rx_bd_v[lp->rx_bd_ci];
760
761 bdstat = cur_p->app0;
762 while ((bdstat & STS_CTRL_APP0_CMPLT)) {
763
764 skb = lp->rx_skb[lp->rx_bd_ci];
765 length = cur_p->app4 & 0x3FFF;
766
767 dma_unmap_single(ndev->dev.parent, cur_p->phys, length,
768 DMA_FROM_DEVICE);
769
770 skb_put(skb, length);
771 skb->dev = ndev;
772 skb->protocol = eth_type_trans(skb, ndev);
773 skb_checksum_none_assert(skb);
774
775 /* if we're doing rx csum offload, set it up */
776 if (((lp->temac_features & TEMAC_FEATURE_RX_CSUM) != 0) &&
777 (skb->protocol == __constant_htons(ETH_P_IP)) &&
778 (skb->len > 64)) {
779
780 skb->csum = cur_p->app3 & 0xFFFF;
781 skb->ip_summed = CHECKSUM_COMPLETE;
782 }
783
784 if (!skb_defer_rx_timestamp(skb))
785 netif_rx(skb);
786
787 ndev->stats.rx_packets++;
788 ndev->stats.rx_bytes += length;
789
790 new_skb = netdev_alloc_skb_ip_align(ndev,
791 XTE_MAX_JUMBO_FRAME_SIZE);
792
793 if (new_skb == 0) {
794 dev_err(&ndev->dev, "no memory for new sk_buff\n");
795 spin_unlock_irqrestore(&lp->rx_lock, flags);
796 return;
797 }
798
799 cur_p->app0 = STS_CTRL_APP0_IRQONEND;
800 cur_p->phys = dma_map_single(ndev->dev.parent, new_skb->data,
801 XTE_MAX_JUMBO_FRAME_SIZE,
802 DMA_FROM_DEVICE);
803 cur_p->len = XTE_MAX_JUMBO_FRAME_SIZE;
804 lp->rx_skb[lp->rx_bd_ci] = new_skb;
805
806 lp->rx_bd_ci++;
807 if (lp->rx_bd_ci >= RX_BD_NUM)
808 lp->rx_bd_ci = 0;
809
810 cur_p = &lp->rx_bd_v[lp->rx_bd_ci];
811 bdstat = cur_p->app0;
812 }
813 lp->dma_out(lp, RX_TAILDESC_PTR, tail_p);
814
815 spin_unlock_irqrestore(&lp->rx_lock, flags);
816 }
817
818 static irqreturn_t ll_temac_tx_irq(int irq, void *_ndev)
819 {
820 struct net_device *ndev = _ndev;
821 struct temac_local *lp = netdev_priv(ndev);
822 unsigned int status;
823
824 status = lp->dma_in(lp, TX_IRQ_REG);
825 lp->dma_out(lp, TX_IRQ_REG, status);
826
827 if (status & (IRQ_COAL | IRQ_DLY))
828 temac_start_xmit_done(lp->ndev);
829 if (status & 0x080)
830 dev_err(&ndev->dev, "DMA error 0x%x\n", status);
831
832 return IRQ_HANDLED;
833 }
834
835 static irqreturn_t ll_temac_rx_irq(int irq, void *_ndev)
836 {
837 struct net_device *ndev = _ndev;
838 struct temac_local *lp = netdev_priv(ndev);
839 unsigned int status;
840
841 /* Read and clear the status registers */
842 status = lp->dma_in(lp, RX_IRQ_REG);
843 lp->dma_out(lp, RX_IRQ_REG, status);
844
845 if (status & (IRQ_COAL | IRQ_DLY))
846 ll_temac_recv(lp->ndev);
847
848 return IRQ_HANDLED;
849 }
850
851 static int temac_open(struct net_device *ndev)
852 {
853 struct temac_local *lp = netdev_priv(ndev);
854 int rc;
855
856 dev_dbg(&ndev->dev, "temac_open()\n");
857
858 if (lp->phy_node) {
859 lp->phy_dev = of_phy_connect(lp->ndev, lp->phy_node,
860 temac_adjust_link, 0, 0);
861 if (!lp->phy_dev) {
862 dev_err(lp->dev, "of_phy_connect() failed\n");
863 return -ENODEV;
864 }
865
866 phy_start(lp->phy_dev);
867 }
868
869 temac_device_reset(ndev);
870
871 rc = request_irq(lp->tx_irq, ll_temac_tx_irq, 0, ndev->name, ndev);
872 if (rc)
873 goto err_tx_irq;
874 rc = request_irq(lp->rx_irq, ll_temac_rx_irq, 0, ndev->name, ndev);
875 if (rc)
876 goto err_rx_irq;
877
878 return 0;
879
880 err_rx_irq:
881 free_irq(lp->tx_irq, ndev);
882 err_tx_irq:
883 if (lp->phy_dev)
884 phy_disconnect(lp->phy_dev);
885 lp->phy_dev = NULL;
886 dev_err(lp->dev, "request_irq() failed\n");
887 return rc;
888 }
889
890 static int temac_stop(struct net_device *ndev)
891 {
892 struct temac_local *lp = netdev_priv(ndev);
893
894 dev_dbg(&ndev->dev, "temac_close()\n");
895
896 free_irq(lp->tx_irq, ndev);
897 free_irq(lp->rx_irq, ndev);
898
899 if (lp->phy_dev)
900 phy_disconnect(lp->phy_dev);
901 lp->phy_dev = NULL;
902
903 temac_dma_bd_release(ndev);
904
905 return 0;
906 }
907
908 #ifdef CONFIG_NET_POLL_CONTROLLER
909 static void
910 temac_poll_controller(struct net_device *ndev)
911 {
912 struct temac_local *lp = netdev_priv(ndev);
913
914 disable_irq(lp->tx_irq);
915 disable_irq(lp->rx_irq);
916
917 ll_temac_rx_irq(lp->tx_irq, ndev);
918 ll_temac_tx_irq(lp->rx_irq, ndev);
919
920 enable_irq(lp->tx_irq);
921 enable_irq(lp->rx_irq);
922 }
923 #endif
924
925 static int temac_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd)
926 {
927 struct temac_local *lp = netdev_priv(ndev);
928
929 if (!netif_running(ndev))
930 return -EINVAL;
931
932 if (!lp->phy_dev)
933 return -EINVAL;
934
935 return phy_mii_ioctl(lp->phy_dev, rq, cmd);
936 }
937
938 static const struct net_device_ops temac_netdev_ops = {
939 .ndo_open = temac_open,
940 .ndo_stop = temac_stop,
941 .ndo_start_xmit = temac_start_xmit,
942 .ndo_set_mac_address = netdev_set_mac_address,
943 .ndo_validate_addr = eth_validate_addr,
944 .ndo_do_ioctl = temac_ioctl,
945 #ifdef CONFIG_NET_POLL_CONTROLLER
946 .ndo_poll_controller = temac_poll_controller,
947 #endif
948 };
949
950 /* ---------------------------------------------------------------------
951 * SYSFS device attributes
952 */
953 static ssize_t temac_show_llink_regs(struct device *dev,
954 struct device_attribute *attr, char *buf)
955 {
956 struct net_device *ndev = dev_get_drvdata(dev);
957 struct temac_local *lp = netdev_priv(ndev);
958 int i, len = 0;
959
960 for (i = 0; i < 0x11; i++)
961 len += sprintf(buf + len, "%.8x%s", lp->dma_in(lp, i),
962 (i % 8) == 7 ? "\n" : " ");
963 len += sprintf(buf + len, "\n");
964
965 return len;
966 }
967
968 static DEVICE_ATTR(llink_regs, 0440, temac_show_llink_regs, NULL);
969
970 static struct attribute *temac_device_attrs[] = {
971 &dev_attr_llink_regs.attr,
972 NULL,
973 };
974
975 static const struct attribute_group temac_attr_group = {
976 .attrs = temac_device_attrs,
977 };
978
979 /* ethtool support */
980 static int temac_get_settings(struct net_device *ndev, struct ethtool_cmd *cmd)
981 {
982 struct temac_local *lp = netdev_priv(ndev);
983 return phy_ethtool_gset(lp->phy_dev, cmd);
984 }
985
986 static int temac_set_settings(struct net_device *ndev, struct ethtool_cmd *cmd)
987 {
988 struct temac_local *lp = netdev_priv(ndev);
989 return phy_ethtool_sset(lp->phy_dev, cmd);
990 }
991
992 static int temac_nway_reset(struct net_device *ndev)
993 {
994 struct temac_local *lp = netdev_priv(ndev);
995 return phy_start_aneg(lp->phy_dev);
996 }
997
998 static const struct ethtool_ops temac_ethtool_ops = {
999 .get_settings = temac_get_settings,
1000 .set_settings = temac_set_settings,
1001 .nway_reset = temac_nway_reset,
1002 .get_link = ethtool_op_get_link,
1003 .get_ts_info = ethtool_op_get_ts_info,
1004 };
1005
1006 static int __devinit temac_of_probe(struct platform_device *op)
1007 {
1008 struct device_node *np;
1009 struct temac_local *lp;
1010 struct net_device *ndev;
1011 const void *addr;
1012 __be32 *p;
1013 int size, rc = 0;
1014
1015 /* Init network device structure */
1016 ndev = alloc_etherdev(sizeof(*lp));
1017 if (!ndev)
1018 return -ENOMEM;
1019
1020 ether_setup(ndev);
1021 dev_set_drvdata(&op->dev, ndev);
1022 SET_NETDEV_DEV(ndev, &op->dev);
1023 ndev->flags &= ~IFF_MULTICAST; /* clear multicast */
1024 ndev->features = NETIF_F_SG | NETIF_F_FRAGLIST;
1025 ndev->netdev_ops = &temac_netdev_ops;
1026 ndev->ethtool_ops = &temac_ethtool_ops;
1027 #if 0
1028 ndev->features |= NETIF_F_IP_CSUM; /* Can checksum TCP/UDP over IPv4. */
1029 ndev->features |= NETIF_F_HW_CSUM; /* Can checksum all the packets. */
1030 ndev->features |= NETIF_F_IPV6_CSUM; /* Can checksum IPV6 TCP/UDP */
1031 ndev->features |= NETIF_F_HIGHDMA; /* Can DMA to high memory. */
1032 ndev->features |= NETIF_F_HW_VLAN_TX; /* Transmit VLAN hw accel */
1033 ndev->features |= NETIF_F_HW_VLAN_RX; /* Receive VLAN hw acceleration */
1034 ndev->features |= NETIF_F_HW_VLAN_FILTER; /* Receive VLAN filtering */
1035 ndev->features |= NETIF_F_VLAN_CHALLENGED; /* cannot handle VLAN pkts */
1036 ndev->features |= NETIF_F_GSO; /* Enable software GSO. */
1037 ndev->features |= NETIF_F_MULTI_QUEUE; /* Has multiple TX/RX queues */
1038 ndev->features |= NETIF_F_LRO; /* large receive offload */
1039 #endif
1040
1041 /* setup temac private info structure */
1042 lp = netdev_priv(ndev);
1043 lp->ndev = ndev;
1044 lp->dev = &op->dev;
1045 lp->options = XTE_OPTION_DEFAULTS;
1046 spin_lock_init(&lp->rx_lock);
1047 mutex_init(&lp->indirect_mutex);
1048
1049 /* map device registers */
1050 lp->regs = of_iomap(op->dev.of_node, 0);
1051 if (!lp->regs) {
1052 dev_err(&op->dev, "could not map temac regs.\n");
1053 goto nodev;
1054 }
1055
1056 /* Setup checksum offload, but default to off if not specified */
1057 lp->temac_features = 0;
1058 p = (__be32 *)of_get_property(op->dev.of_node, "xlnx,txcsum", NULL);
1059 if (p && be32_to_cpu(*p)) {
1060 lp->temac_features |= TEMAC_FEATURE_TX_CSUM;
1061 /* Can checksum TCP/UDP over IPv4. */
1062 ndev->features |= NETIF_F_IP_CSUM;
1063 }
1064 p = (__be32 *)of_get_property(op->dev.of_node, "xlnx,rxcsum", NULL);
1065 if (p && be32_to_cpu(*p))
1066 lp->temac_features |= TEMAC_FEATURE_RX_CSUM;
1067
1068 /* Find the DMA node, map the DMA registers, and decode the DMA IRQs */
1069 np = of_parse_phandle(op->dev.of_node, "llink-connected", 0);
1070 if (!np) {
1071 dev_err(&op->dev, "could not find DMA node\n");
1072 goto err_iounmap;
1073 }
1074
1075 /* Setup the DMA register accesses, could be DCR or memory mapped */
1076 if (temac_dcr_setup(lp, op, np)) {
1077
1078 /* no DCR in the device tree, try non-DCR */
1079 lp->sdma_regs = of_iomap(np, 0);
1080 if (lp->sdma_regs) {
1081 lp->dma_in = temac_dma_in32;
1082 lp->dma_out = temac_dma_out32;
1083 dev_dbg(&op->dev, "MEM base: %p\n", lp->sdma_regs);
1084 } else {
1085 dev_err(&op->dev, "unable to map DMA registers\n");
1086 of_node_put(np);
1087 goto err_iounmap;
1088 }
1089 }
1090
1091 lp->rx_irq = irq_of_parse_and_map(np, 0);
1092 lp->tx_irq = irq_of_parse_and_map(np, 1);
1093
1094 of_node_put(np); /* Finished with the DMA node; drop the reference */
1095
1096 if (!lp->rx_irq || !lp->tx_irq) {
1097 dev_err(&op->dev, "could not determine irqs\n");
1098 rc = -ENOMEM;
1099 goto err_iounmap_2;
1100 }
1101
1102
1103 /* Retrieve the MAC address */
1104 addr = of_get_property(op->dev.of_node, "local-mac-address", &size);
1105 if ((!addr) || (size != 6)) {
1106 dev_err(&op->dev, "could not find MAC address\n");
1107 rc = -ENODEV;
1108 goto err_iounmap_2;
1109 }
1110 temac_set_mac_address(ndev, (void *)addr);
1111
1112 rc = temac_mdio_setup(lp, op->dev.of_node);
1113 if (rc)
1114 dev_warn(&op->dev, "error registering MDIO bus\n");
1115
1116 lp->phy_node = of_parse_phandle(op->dev.of_node, "phy-handle", 0);
1117 if (lp->phy_node)
1118 dev_dbg(lp->dev, "using PHY node %s (%p)\n", np->full_name, np);
1119
1120 /* Add the device attributes */
1121 rc = sysfs_create_group(&lp->dev->kobj, &temac_attr_group);
1122 if (rc) {
1123 dev_err(lp->dev, "Error creating sysfs files\n");
1124 goto err_iounmap_2;
1125 }
1126
1127 rc = register_netdev(lp->ndev);
1128 if (rc) {
1129 dev_err(lp->dev, "register_netdev() error (%i)\n", rc);
1130 goto err_register_ndev;
1131 }
1132
1133 return 0;
1134
1135 err_register_ndev:
1136 sysfs_remove_group(&lp->dev->kobj, &temac_attr_group);
1137 err_iounmap_2:
1138 if (lp->sdma_regs)
1139 iounmap(lp->sdma_regs);
1140 err_iounmap:
1141 iounmap(lp->regs);
1142 nodev:
1143 free_netdev(ndev);
1144 ndev = NULL;
1145 return rc;
1146 }
1147
1148 static int __devexit temac_of_remove(struct platform_device *op)
1149 {
1150 struct net_device *ndev = dev_get_drvdata(&op->dev);
1151 struct temac_local *lp = netdev_priv(ndev);
1152
1153 temac_mdio_teardown(lp);
1154 unregister_netdev(ndev);
1155 sysfs_remove_group(&lp->dev->kobj, &temac_attr_group);
1156 if (lp->phy_node)
1157 of_node_put(lp->phy_node);
1158 lp->phy_node = NULL;
1159 dev_set_drvdata(&op->dev, NULL);
1160 iounmap(lp->regs);
1161 if (lp->sdma_regs)
1162 iounmap(lp->sdma_regs);
1163 free_netdev(ndev);
1164 return 0;
1165 }
1166
1167 static struct of_device_id temac_of_match[] __devinitdata = {
1168 { .compatible = "xlnx,xps-ll-temac-1.01.b", },
1169 { .compatible = "xlnx,xps-ll-temac-2.00.a", },
1170 { .compatible = "xlnx,xps-ll-temac-2.02.a", },
1171 { .compatible = "xlnx,xps-ll-temac-2.03.a", },
1172 {},
1173 };
1174 MODULE_DEVICE_TABLE(of, temac_of_match);
1175
1176 static struct platform_driver temac_of_driver = {
1177 .probe = temac_of_probe,
1178 .remove = __devexit_p(temac_of_remove),
1179 .driver = {
1180 .owner = THIS_MODULE,
1181 .name = "xilinx_temac",
1182 .of_match_table = temac_of_match,
1183 },
1184 };
1185
1186 module_platform_driver(temac_of_driver);
1187
1188 MODULE_DESCRIPTION("Xilinx LL_TEMAC Ethernet driver");
1189 MODULE_AUTHOR("Yoshio Kashiwagi");
1190 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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