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Adding support for MOXA ART SoC. Testing port of linux-2.6.32.60-moxart.
[linux-3.6.7-moxart.git] / drivers / net / ethernet / xilinx / ll_temac_main.c
blobf8e351880119674c0c10b270a45fdf47469dd702
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->protocol = eth_type_trans(skb, ndev);
772 skb_checksum_none_assert(skb);
773
774 /* if we're doing rx csum offload, set it up */
775 if (((lp->temac_features & TEMAC_FEATURE_RX_CSUM) != 0) &&
776 (skb->protocol == __constant_htons(ETH_P_IP)) &&
777 (skb->len > 64)) {
778
779 skb->csum = cur_p->app3 & 0xFFFF;
780 skb->ip_summed = CHECKSUM_COMPLETE;
781 }
782
783 if (!skb_defer_rx_timestamp(skb))
784 netif_rx(skb);
785
786 ndev->stats.rx_packets++;
787 ndev->stats.rx_bytes += length;
788
789 new_skb = netdev_alloc_skb_ip_align(ndev,
790 XTE_MAX_JUMBO_FRAME_SIZE);
791
792 if (new_skb == 0) {
793 dev_err(&ndev->dev, "no memory for new sk_buff\n");
794 spin_unlock_irqrestore(&lp->rx_lock, flags);
795 return;
796 }
797
798 cur_p->app0 = STS_CTRL_APP0_IRQONEND;
799 cur_p->phys = dma_map_single(ndev->dev.parent, new_skb->data,
800 XTE_MAX_JUMBO_FRAME_SIZE,
801 DMA_FROM_DEVICE);
802 cur_p->len = XTE_MAX_JUMBO_FRAME_SIZE;
803 lp->rx_skb[lp->rx_bd_ci] = new_skb;
804
805 lp->rx_bd_ci++;
806 if (lp->rx_bd_ci >= RX_BD_NUM)
807 lp->rx_bd_ci = 0;
808
809 cur_p = &lp->rx_bd_v[lp->rx_bd_ci];
810 bdstat = cur_p->app0;
811 }
812 lp->dma_out(lp, RX_TAILDESC_PTR, tail_p);
813
814 spin_unlock_irqrestore(&lp->rx_lock, flags);
815 }
816
817 static irqreturn_t ll_temac_tx_irq(int irq, void *_ndev)
818 {
819 struct net_device *ndev = _ndev;
820 struct temac_local *lp = netdev_priv(ndev);
821 unsigned int status;
822
823 status = lp->dma_in(lp, TX_IRQ_REG);
824 lp->dma_out(lp, TX_IRQ_REG, status);
825
826 if (status & (IRQ_COAL | IRQ_DLY))
827 temac_start_xmit_done(lp->ndev);
828 if (status & 0x080)
829 dev_err(&ndev->dev, "DMA error 0x%x\n", status);
830
831 return IRQ_HANDLED;
832 }
833
834 static irqreturn_t ll_temac_rx_irq(int irq, void *_ndev)
835 {
836 struct net_device *ndev = _ndev;
837 struct temac_local *lp = netdev_priv(ndev);
838 unsigned int status;
839
840 /* Read and clear the status registers */
841 status = lp->dma_in(lp, RX_IRQ_REG);
842 lp->dma_out(lp, RX_IRQ_REG, status);
843
844 if (status & (IRQ_COAL | IRQ_DLY))
845 ll_temac_recv(lp->ndev);
846
847 return IRQ_HANDLED;
848 }
849
850 static int temac_open(struct net_device *ndev)
851 {
852 struct temac_local *lp = netdev_priv(ndev);
853 int rc;
854
855 dev_dbg(&ndev->dev, "temac_open()\n");
856
857 if (lp->phy_node) {
858 lp->phy_dev = of_phy_connect(lp->ndev, lp->phy_node,
859 temac_adjust_link, 0, 0);
860 if (!lp->phy_dev) {
861 dev_err(lp->dev, "of_phy_connect() failed\n");
862 return -ENODEV;
863 }
864
865 phy_start(lp->phy_dev);
866 }
867
868 temac_device_reset(ndev);
869
870 rc = request_irq(lp->tx_irq, ll_temac_tx_irq, 0, ndev->name, ndev);
871 if (rc)
872 goto err_tx_irq;
873 rc = request_irq(lp->rx_irq, ll_temac_rx_irq, 0, ndev->name, ndev);
874 if (rc)
875 goto err_rx_irq;
876
877 return 0;
878
879 err_rx_irq:
880 free_irq(lp->tx_irq, ndev);
881 err_tx_irq:
882 if (lp->phy_dev)
883 phy_disconnect(lp->phy_dev);
884 lp->phy_dev = NULL;
885 dev_err(lp->dev, "request_irq() failed\n");
886 return rc;
887 }
888
889 static int temac_stop(struct net_device *ndev)
890 {
891 struct temac_local *lp = netdev_priv(ndev);
892
893 dev_dbg(&ndev->dev, "temac_close()\n");
894
895 free_irq(lp->tx_irq, ndev);
896 free_irq(lp->rx_irq, ndev);
897
898 if (lp->phy_dev)
899 phy_disconnect(lp->phy_dev);
900 lp->phy_dev = NULL;
901
902 temac_dma_bd_release(ndev);
903
904 return 0;
905 }
906
907 #ifdef CONFIG_NET_POLL_CONTROLLER
908 static void
909 temac_poll_controller(struct net_device *ndev)
910 {
911 struct temac_local *lp = netdev_priv(ndev);
912
913 disable_irq(lp->tx_irq);
914 disable_irq(lp->rx_irq);
915
916 ll_temac_rx_irq(lp->tx_irq, ndev);
917 ll_temac_tx_irq(lp->rx_irq, ndev);
918
919 enable_irq(lp->tx_irq);
920 enable_irq(lp->rx_irq);
921 }
922 #endif
923
924 static int temac_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd)
925 {
926 struct temac_local *lp = netdev_priv(ndev);
927
928 if (!netif_running(ndev))
929 return -EINVAL;
930
931 if (!lp->phy_dev)
932 return -EINVAL;
933
934 return phy_mii_ioctl(lp->phy_dev, rq, cmd);
935 }
936
937 static const struct net_device_ops temac_netdev_ops = {
938 .ndo_open = temac_open,
939 .ndo_stop = temac_stop,
940 .ndo_start_xmit = temac_start_xmit,
941 .ndo_set_mac_address = netdev_set_mac_address,
942 .ndo_validate_addr = eth_validate_addr,
943 .ndo_do_ioctl = temac_ioctl,
944 #ifdef CONFIG_NET_POLL_CONTROLLER
945 .ndo_poll_controller = temac_poll_controller,
946 #endif
947 };
948
949 /* ---------------------------------------------------------------------
950 * SYSFS device attributes
951 */
952 static ssize_t temac_show_llink_regs(struct device *dev,
953 struct device_attribute *attr, char *buf)
954 {
955 struct net_device *ndev = dev_get_drvdata(dev);
956 struct temac_local *lp = netdev_priv(ndev);
957 int i, len = 0;
958
959 for (i = 0; i < 0x11; i++)
960 len += sprintf(buf + len, "%.8x%s", lp->dma_in(lp, i),
961 (i % 8) == 7 ? "\n" : " ");
962 len += sprintf(buf + len, "\n");
963
964 return len;
965 }
966
967 static DEVICE_ATTR(llink_regs, 0440, temac_show_llink_regs, NULL);
968
969 static struct attribute *temac_device_attrs[] = {
970 &dev_attr_llink_regs.attr,
971 NULL,
972 };
973
974 static const struct attribute_group temac_attr_group = {
975 .attrs = temac_device_attrs,
976 };
977
978 /* ethtool support */
979 static int temac_get_settings(struct net_device *ndev, struct ethtool_cmd *cmd)
980 {
981 struct temac_local *lp = netdev_priv(ndev);
982 return phy_ethtool_gset(lp->phy_dev, cmd);
983 }
984
985 static int temac_set_settings(struct net_device *ndev, struct ethtool_cmd *cmd)
986 {
987 struct temac_local *lp = netdev_priv(ndev);
988 return phy_ethtool_sset(lp->phy_dev, cmd);
989 }
990
991 static int temac_nway_reset(struct net_device *ndev)
992 {
993 struct temac_local *lp = netdev_priv(ndev);
994 return phy_start_aneg(lp->phy_dev);
995 }
996
997 static const struct ethtool_ops temac_ethtool_ops = {
998 .get_settings = temac_get_settings,
999 .set_settings = temac_set_settings,
1000 .nway_reset = temac_nway_reset,
1001 .get_link = ethtool_op_get_link,
1002 .get_ts_info = ethtool_op_get_ts_info,
1003 };
1004
1005 static int __devinit temac_of_probe(struct platform_device *op)
1006 {
1007 struct device_node *np;
1008 struct temac_local *lp;
1009 struct net_device *ndev;
1010 const void *addr;
1011 __be32 *p;
1012 int size, rc = 0;
1013
1014 /* Init network device structure */
1015 ndev = alloc_etherdev(sizeof(*lp));
1016 if (!ndev)
1017 return -ENOMEM;
1018
1019 ether_setup(ndev);
1020 dev_set_drvdata(&op->dev, ndev);
1021 SET_NETDEV_DEV(ndev, &op->dev);
1022 ndev->flags &= ~IFF_MULTICAST; /* clear multicast */
1023 ndev->features = NETIF_F_SG | NETIF_F_FRAGLIST;
1024 ndev->netdev_ops = &temac_netdev_ops;
1025 ndev->ethtool_ops = &temac_ethtool_ops;
1026 #if 0
1027 ndev->features |= NETIF_F_IP_CSUM; /* Can checksum TCP/UDP over IPv4. */
1028 ndev->features |= NETIF_F_HW_CSUM; /* Can checksum all the packets. */
1029 ndev->features |= NETIF_F_IPV6_CSUM; /* Can checksum IPV6 TCP/UDP */
1030 ndev->features |= NETIF_F_HIGHDMA; /* Can DMA to high memory. */
1031 ndev->features |= NETIF_F_HW_VLAN_TX; /* Transmit VLAN hw accel */
1032 ndev->features |= NETIF_F_HW_VLAN_RX; /* Receive VLAN hw acceleration */
1033 ndev->features |= NETIF_F_HW_VLAN_FILTER; /* Receive VLAN filtering */
1034 ndev->features |= NETIF_F_VLAN_CHALLENGED; /* cannot handle VLAN pkts */
1035 ndev->features |= NETIF_F_GSO; /* Enable software GSO. */
1036 ndev->features |= NETIF_F_MULTI_QUEUE; /* Has multiple TX/RX queues */
1037 ndev->features |= NETIF_F_LRO; /* large receive offload */
1038 #endif
1039
1040 /* setup temac private info structure */
1041 lp = netdev_priv(ndev);
1042 lp->ndev = ndev;
1043 lp->dev = &op->dev;
1044 lp->options = XTE_OPTION_DEFAULTS;
1045 spin_lock_init(&lp->rx_lock);
1046 mutex_init(&lp->indirect_mutex);
1047
1048 /* map device registers */
1049 lp->regs = of_iomap(op->dev.of_node, 0);
1050 if (!lp->regs) {
1051 dev_err(&op->dev, "could not map temac regs.\n");
1052 goto nodev;
1053 }
1054
1055 /* Setup checksum offload, but default to off if not specified */
1056 lp->temac_features = 0;
1057 p = (__be32 *)of_get_property(op->dev.of_node, "xlnx,txcsum", NULL);
1058 if (p && be32_to_cpu(*p)) {
1059 lp->temac_features |= TEMAC_FEATURE_TX_CSUM;
1060 /* Can checksum TCP/UDP over IPv4. */
1061 ndev->features |= NETIF_F_IP_CSUM;
1062 }
1063 p = (__be32 *)of_get_property(op->dev.of_node, "xlnx,rxcsum", NULL);
1064 if (p && be32_to_cpu(*p))
1065 lp->temac_features |= TEMAC_FEATURE_RX_CSUM;
1066
1067 /* Find the DMA node, map the DMA registers, and decode the DMA IRQs */
1068 np = of_parse_phandle(op->dev.of_node, "llink-connected", 0);
1069 if (!np) {
1070 dev_err(&op->dev, "could not find DMA node\n");
1071 goto err_iounmap;
1072 }
1073
1074 /* Setup the DMA register accesses, could be DCR or memory mapped */
1075 if (temac_dcr_setup(lp, op, np)) {
1076
1077 /* no DCR in the device tree, try non-DCR */
1078 lp->sdma_regs = of_iomap(np, 0);
1079 if (lp->sdma_regs) {
1080 lp->dma_in = temac_dma_in32;
1081 lp->dma_out = temac_dma_out32;
1082 dev_dbg(&op->dev, "MEM base: %p\n", lp->sdma_regs);
1083 } else {
1084 dev_err(&op->dev, "unable to map DMA registers\n");
1085 of_node_put(np);
1086 goto err_iounmap;
1087 }
1088 }
1089
1090 lp->rx_irq = irq_of_parse_and_map(np, 0);
1091 lp->tx_irq = irq_of_parse_and_map(np, 1);
1092
1093 of_node_put(np); /* Finished with the DMA node; drop the reference */
1094
1095 if (!lp->rx_irq || !lp->tx_irq) {
1096 dev_err(&op->dev, "could not determine irqs\n");
1097 rc = -ENOMEM;
1098 goto err_iounmap_2;
1099 }
1100
1101
1102 /* Retrieve the MAC address */
1103 addr = of_get_property(op->dev.of_node, "local-mac-address", &size);
1104 if ((!addr) || (size != 6)) {
1105 dev_err(&op->dev, "could not find MAC address\n");
1106 rc = -ENODEV;
1107 goto err_iounmap_2;
1108 }
1109 temac_set_mac_address(ndev, (void *)addr);
1110
1111 rc = temac_mdio_setup(lp, op->dev.of_node);
1112 if (rc)
1113 dev_warn(&op->dev, "error registering MDIO bus\n");
1114
1115 lp->phy_node = of_parse_phandle(op->dev.of_node, "phy-handle", 0);
1116 if (lp->phy_node)
1117 dev_dbg(lp->dev, "using PHY node %s (%p)\n", np->full_name, np);
1118
1119 /* Add the device attributes */
1120 rc = sysfs_create_group(&lp->dev->kobj, &temac_attr_group);
1121 if (rc) {
1122 dev_err(lp->dev, "Error creating sysfs files\n");
1123 goto err_iounmap_2;
1124 }
1125
1126 rc = register_netdev(lp->ndev);
1127 if (rc) {
1128 dev_err(lp->dev, "register_netdev() error (%i)\n", rc);
1129 goto err_register_ndev;
1130 }
1131
1132 return 0;
1133
1134 err_register_ndev:
1135 sysfs_remove_group(&lp->dev->kobj, &temac_attr_group);
1136 err_iounmap_2:
1137 if (lp->sdma_regs)
1138 iounmap(lp->sdma_regs);
1139 err_iounmap:
1140 iounmap(lp->regs);
1141 nodev:
1142 free_netdev(ndev);
1143 ndev = NULL;
1144 return rc;
1145 }
1146
1147 static int __devexit temac_of_remove(struct platform_device *op)
1148 {
1149 struct net_device *ndev = dev_get_drvdata(&op->dev);
1150 struct temac_local *lp = netdev_priv(ndev);
1151
1152 temac_mdio_teardown(lp);
1153 unregister_netdev(ndev);
1154 sysfs_remove_group(&lp->dev->kobj, &temac_attr_group);
1155 if (lp->phy_node)
1156 of_node_put(lp->phy_node);
1157 lp->phy_node = NULL;
1158 dev_set_drvdata(&op->dev, NULL);
1159 iounmap(lp->regs);
1160 if (lp->sdma_regs)
1161 iounmap(lp->sdma_regs);
1162 free_netdev(ndev);
1163 return 0;
1164 }
1165
1166 static struct of_device_id temac_of_match[] __devinitdata = {
1167 { .compatible = "xlnx,xps-ll-temac-1.01.b", },
1168 { .compatible = "xlnx,xps-ll-temac-2.00.a", },
1169 { .compatible = "xlnx,xps-ll-temac-2.02.a", },
1170 { .compatible = "xlnx,xps-ll-temac-2.03.a", },
1171 {},
1172 };
1173 MODULE_DEVICE_TABLE(of, temac_of_match);
1174
1175 static struct platform_driver temac_of_driver = {
1176 .probe = temac_of_probe,
1177 .remove = __devexit_p(temac_of_remove),
1178 .driver = {
1179 .owner = THIS_MODULE,
1180 .name = "xilinx_temac",
1181 .of_match_table = temac_of_match,
1182 },
1183 };
1184
1185 module_platform_driver(temac_of_driver);
1186
1187 MODULE_DESCRIPTION("Xilinx LL_TEMAC Ethernet driver");
1188 MODULE_AUTHOR("Yoshio Kashiwagi");
1189 MODULE_LICENSE("GPL");
Linux ARM platform port for MOXA ART SoC