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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / net / ethernet / xilinx / ll_temac_main.c
blobf21addb1db95e89768eb431d4c634bb3e195b1d8
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 random_ether_addr(ndev->dev_addr);
331
332 /* set up unicast MAC address filter set its mac address */
333 mutex_lock(&lp->indirect_mutex);
334 temac_indirect_out32(lp, XTE_UAW0_OFFSET,
335 (ndev->dev_addr[0]) |
336 (ndev->dev_addr[1] << 8) |
337 (ndev->dev_addr[2] << 16) |
338 (ndev->dev_addr[3] << 24));
339 /* There are reserved bits in EUAW1
340 * so don't affect them Set MAC bits [47:32] in EUAW1 */
341 temac_indirect_out32(lp, XTE_UAW1_OFFSET,
342 (ndev->dev_addr[4] & 0x000000ff) |
343 (ndev->dev_addr[5] << 8));
344 mutex_unlock(&lp->indirect_mutex);
345
346 return 0;
347 }
348
349 static int netdev_set_mac_address(struct net_device *ndev, void *p)
350 {
351 struct sockaddr *addr = p;
352
353 return temac_set_mac_address(ndev, addr->sa_data);
354 }
355
356 static void temac_set_multicast_list(struct net_device *ndev)
357 {
358 struct temac_local *lp = netdev_priv(ndev);
359 u32 multi_addr_msw, multi_addr_lsw, val;
360 int i;
361
362 mutex_lock(&lp->indirect_mutex);
363 if (ndev->flags & (IFF_ALLMULTI | IFF_PROMISC) ||
364 netdev_mc_count(ndev) > MULTICAST_CAM_TABLE_NUM) {
365 /*
366 * We must make the kernel realise we had to move
367 * into promisc mode or we start all out war on
368 * the cable. If it was a promisc request the
369 * flag is already set. If not we assert it.
370 */
371 ndev->flags |= IFF_PROMISC;
372 temac_indirect_out32(lp, XTE_AFM_OFFSET, XTE_AFM_EPPRM_MASK);
373 dev_info(&ndev->dev, "Promiscuous mode enabled.\n");
374 } else if (!netdev_mc_empty(ndev)) {
375 struct netdev_hw_addr *ha;
376
377 i = 0;
378 netdev_for_each_mc_addr(ha, ndev) {
379 if (i >= MULTICAST_CAM_TABLE_NUM)
380 break;
381 multi_addr_msw = ((ha->addr[3] << 24) |
382 (ha->addr[2] << 16) |
383 (ha->addr[1] << 8) |
384 (ha->addr[0]));
385 temac_indirect_out32(lp, XTE_MAW0_OFFSET,
386 multi_addr_msw);
387 multi_addr_lsw = ((ha->addr[5] << 8) |
388 (ha->addr[4]) | (i << 16));
389 temac_indirect_out32(lp, XTE_MAW1_OFFSET,
390 multi_addr_lsw);
391 i++;
392 }
393 } else {
394 val = temac_indirect_in32(lp, XTE_AFM_OFFSET);
395 temac_indirect_out32(lp, XTE_AFM_OFFSET,
396 val & ~XTE_AFM_EPPRM_MASK);
397 temac_indirect_out32(lp, XTE_MAW0_OFFSET, 0);
398 temac_indirect_out32(lp, XTE_MAW1_OFFSET, 0);
399 dev_info(&ndev->dev, "Promiscuous mode disabled.\n");
400 }
401 mutex_unlock(&lp->indirect_mutex);
402 }
403
404 struct temac_option {
405 int flg;
406 u32 opt;
407 u32 reg;
408 u32 m_or;
409 u32 m_and;
410 } temac_options[] = {
411 /* Turn on jumbo packet support for both Rx and Tx */
412 {
413 .opt = XTE_OPTION_JUMBO,
414 .reg = XTE_TXC_OFFSET,
415 .m_or = XTE_TXC_TXJMBO_MASK,
416 },
417 {
418 .opt = XTE_OPTION_JUMBO,
419 .reg = XTE_RXC1_OFFSET,
420 .m_or =XTE_RXC1_RXJMBO_MASK,
421 },
422 /* Turn on VLAN packet support for both Rx and Tx */
423 {
424 .opt = XTE_OPTION_VLAN,
425 .reg = XTE_TXC_OFFSET,
426 .m_or =XTE_TXC_TXVLAN_MASK,
427 },
428 {
429 .opt = XTE_OPTION_VLAN,
430 .reg = XTE_RXC1_OFFSET,
431 .m_or =XTE_RXC1_RXVLAN_MASK,
432 },
433 /* Turn on FCS stripping on receive packets */
434 {
435 .opt = XTE_OPTION_FCS_STRIP,
436 .reg = XTE_RXC1_OFFSET,
437 .m_or =XTE_RXC1_RXFCS_MASK,
438 },
439 /* Turn on FCS insertion on transmit packets */
440 {
441 .opt = XTE_OPTION_FCS_INSERT,
442 .reg = XTE_TXC_OFFSET,
443 .m_or =XTE_TXC_TXFCS_MASK,
444 },
445 /* Turn on length/type field checking on receive packets */
446 {
447 .opt = XTE_OPTION_LENTYPE_ERR,
448 .reg = XTE_RXC1_OFFSET,
449 .m_or =XTE_RXC1_RXLT_MASK,
450 },
451 /* Turn on flow control */
452 {
453 .opt = XTE_OPTION_FLOW_CONTROL,
454 .reg = XTE_FCC_OFFSET,
455 .m_or =XTE_FCC_RXFLO_MASK,
456 },
457 /* Turn on flow control */
458 {
459 .opt = XTE_OPTION_FLOW_CONTROL,
460 .reg = XTE_FCC_OFFSET,
461 .m_or =XTE_FCC_TXFLO_MASK,
462 },
463 /* Turn on promiscuous frame filtering (all frames are received ) */
464 {
465 .opt = XTE_OPTION_PROMISC,
466 .reg = XTE_AFM_OFFSET,
467 .m_or =XTE_AFM_EPPRM_MASK,
468 },
469 /* Enable transmitter if not already enabled */
470 {
471 .opt = XTE_OPTION_TXEN,
472 .reg = XTE_TXC_OFFSET,
473 .m_or =XTE_TXC_TXEN_MASK,
474 },
475 /* Enable receiver? */
476 {
477 .opt = XTE_OPTION_RXEN,
478 .reg = XTE_RXC1_OFFSET,
479 .m_or =XTE_RXC1_RXEN_MASK,
480 },
481 {}
482 };
483
484 /**
485 * temac_setoptions
486 */
487 static u32 temac_setoptions(struct net_device *ndev, u32 options)
488 {
489 struct temac_local *lp = netdev_priv(ndev);
490 struct temac_option *tp = &temac_options[0];
491 int reg;
492
493 mutex_lock(&lp->indirect_mutex);
494 while (tp->opt) {
495 reg = temac_indirect_in32(lp, tp->reg) & ~tp->m_or;
496 if (options & tp->opt)
497 reg |= tp->m_or;
498 temac_indirect_out32(lp, tp->reg, reg);
499 tp++;
500 }
501 lp->options |= options;
502 mutex_unlock(&lp->indirect_mutex);
503
504 return 0;
505 }
506
507 /* Initialize temac */
508 static void temac_device_reset(struct net_device *ndev)
509 {
510 struct temac_local *lp = netdev_priv(ndev);
511 u32 timeout;
512 u32 val;
513
514 /* Perform a software reset */
515
516 /* 0x300 host enable bit ? */
517 /* reset PHY through control register ?:1 */
518
519 dev_dbg(&ndev->dev, "%s()\n", __func__);
520
521 mutex_lock(&lp->indirect_mutex);
522 /* Reset the receiver and wait for it to finish reset */
523 temac_indirect_out32(lp, XTE_RXC1_OFFSET, XTE_RXC1_RXRST_MASK);
524 timeout = 1000;
525 while (temac_indirect_in32(lp, XTE_RXC1_OFFSET) & XTE_RXC1_RXRST_MASK) {
526 udelay(1);
527 if (--timeout == 0) {
528 dev_err(&ndev->dev,
529 "temac_device_reset RX reset timeout!!\n");
530 break;
531 }
532 }
533
534 /* Reset the transmitter and wait for it to finish reset */
535 temac_indirect_out32(lp, XTE_TXC_OFFSET, XTE_TXC_TXRST_MASK);
536 timeout = 1000;
537 while (temac_indirect_in32(lp, XTE_TXC_OFFSET) & XTE_TXC_TXRST_MASK) {
538 udelay(1);
539 if (--timeout == 0) {
540 dev_err(&ndev->dev,
541 "temac_device_reset TX reset timeout!!\n");
542 break;
543 }
544 }
545
546 /* Disable the receiver */
547 val = temac_indirect_in32(lp, XTE_RXC1_OFFSET);
548 temac_indirect_out32(lp, XTE_RXC1_OFFSET, val & ~XTE_RXC1_RXEN_MASK);
549
550 /* Reset Local Link (DMA) */
551 lp->dma_out(lp, DMA_CONTROL_REG, DMA_CONTROL_RST);
552 timeout = 1000;
553 while (lp->dma_in(lp, DMA_CONTROL_REG) & DMA_CONTROL_RST) {
554 udelay(1);
555 if (--timeout == 0) {
556 dev_err(&ndev->dev,
557 "temac_device_reset DMA reset timeout!!\n");
558 break;
559 }
560 }
561 lp->dma_out(lp, DMA_CONTROL_REG, DMA_TAIL_ENABLE);
562
563 if (temac_dma_bd_init(ndev)) {
564 dev_err(&ndev->dev,
565 "temac_device_reset descriptor allocation failed\n");
566 }
567
568 temac_indirect_out32(lp, XTE_RXC0_OFFSET, 0);
569 temac_indirect_out32(lp, XTE_RXC1_OFFSET, 0);
570 temac_indirect_out32(lp, XTE_TXC_OFFSET, 0);
571 temac_indirect_out32(lp, XTE_FCC_OFFSET, XTE_FCC_RXFLO_MASK);
572
573 mutex_unlock(&lp->indirect_mutex);
574
575 /* Sync default options with HW
576 * but leave receiver and transmitter disabled. */
577 temac_setoptions(ndev,
578 lp->options & ~(XTE_OPTION_TXEN | XTE_OPTION_RXEN));
579
580 temac_set_mac_address(ndev, NULL);
581
582 /* Set address filter table */
583 temac_set_multicast_list(ndev);
584 if (temac_setoptions(ndev, lp->options))
585 dev_err(&ndev->dev, "Error setting TEMAC options\n");
586
587 /* Init Driver variable */
588 ndev->trans_start = jiffies; /* prevent tx timeout */
589 }
590
591 void temac_adjust_link(struct net_device *ndev)
592 {
593 struct temac_local *lp = netdev_priv(ndev);
594 struct phy_device *phy = lp->phy_dev;
595 u32 mii_speed;
596 int link_state;
597
598 /* hash together the state values to decide if something has changed */
599 link_state = phy->speed | (phy->duplex << 1) | phy->link;
600
601 mutex_lock(&lp->indirect_mutex);
602 if (lp->last_link != link_state) {
603 mii_speed = temac_indirect_in32(lp, XTE_EMCFG_OFFSET);
604 mii_speed &= ~XTE_EMCFG_LINKSPD_MASK;
605
606 switch (phy->speed) {
607 case SPEED_1000: mii_speed |= XTE_EMCFG_LINKSPD_1000; break;
608 case SPEED_100: mii_speed |= XTE_EMCFG_LINKSPD_100; break;
609 case SPEED_10: mii_speed |= XTE_EMCFG_LINKSPD_10; break;
610 }
611
612 /* Write new speed setting out to TEMAC */
613 temac_indirect_out32(lp, XTE_EMCFG_OFFSET, mii_speed);
614 lp->last_link = link_state;
615 phy_print_status(phy);
616 }
617 mutex_unlock(&lp->indirect_mutex);
618 }
619
620 static void temac_start_xmit_done(struct net_device *ndev)
621 {
622 struct temac_local *lp = netdev_priv(ndev);
623 struct cdmac_bd *cur_p;
624 unsigned int stat = 0;
625
626 cur_p = &lp->tx_bd_v[lp->tx_bd_ci];
627 stat = cur_p->app0;
628
629 while (stat & STS_CTRL_APP0_CMPLT) {
630 dma_unmap_single(ndev->dev.parent, cur_p->phys, cur_p->len,
631 DMA_TO_DEVICE);
632 if (cur_p->app4)
633 dev_kfree_skb_irq((struct sk_buff *)cur_p->app4);
634 cur_p->app0 = 0;
635 cur_p->app1 = 0;
636 cur_p->app2 = 0;
637 cur_p->app3 = 0;
638 cur_p->app4 = 0;
639
640 ndev->stats.tx_packets++;
641 ndev->stats.tx_bytes += cur_p->len;
642
643 lp->tx_bd_ci++;
644 if (lp->tx_bd_ci >= TX_BD_NUM)
645 lp->tx_bd_ci = 0;
646
647 cur_p = &lp->tx_bd_v[lp->tx_bd_ci];
648 stat = cur_p->app0;
649 }
650
651 netif_wake_queue(ndev);
652 }
653
654 static inline int temac_check_tx_bd_space(struct temac_local *lp, int num_frag)
655 {
656 struct cdmac_bd *cur_p;
657 int tail;
658
659 tail = lp->tx_bd_tail;
660 cur_p = &lp->tx_bd_v[tail];
661
662 do {
663 if (cur_p->app0)
664 return NETDEV_TX_BUSY;
665
666 tail++;
667 if (tail >= TX_BD_NUM)
668 tail = 0;
669
670 cur_p = &lp->tx_bd_v[tail];
671 num_frag--;
672 } while (num_frag >= 0);
673
674 return 0;
675 }
676
677 static int temac_start_xmit(struct sk_buff *skb, struct net_device *ndev)
678 {
679 struct temac_local *lp = netdev_priv(ndev);
680 struct cdmac_bd *cur_p;
681 dma_addr_t start_p, tail_p;
682 int ii;
683 unsigned long num_frag;
684 skb_frag_t *frag;
685
686 num_frag = skb_shinfo(skb)->nr_frags;
687 frag = &skb_shinfo(skb)->frags[0];
688 start_p = lp->tx_bd_p + sizeof(*lp->tx_bd_v) * lp->tx_bd_tail;
689 cur_p = &lp->tx_bd_v[lp->tx_bd_tail];
690
691 if (temac_check_tx_bd_space(lp, num_frag)) {
692 if (!netif_queue_stopped(ndev)) {
693 netif_stop_queue(ndev);
694 return NETDEV_TX_BUSY;
695 }
696 return NETDEV_TX_BUSY;
697 }
698
699 cur_p->app0 = 0;
700 if (skb->ip_summed == CHECKSUM_PARTIAL) {
701 unsigned int csum_start_off = skb_checksum_start_offset(skb);
702 unsigned int csum_index_off = csum_start_off + skb->csum_offset;
703
704 cur_p->app0 |= 1; /* TX Checksum Enabled */
705 cur_p->app1 = (csum_start_off << 16) | csum_index_off;
706 cur_p->app2 = 0; /* initial checksum seed */
707 }
708
709 cur_p->app0 |= STS_CTRL_APP0_SOP;
710 cur_p->len = skb_headlen(skb);
711 cur_p->phys = dma_map_single(ndev->dev.parent, skb->data, skb->len,
712 DMA_TO_DEVICE);
713 cur_p->app4 = (unsigned long)skb;
714
715 for (ii = 0; ii < num_frag; ii++) {
716 lp->tx_bd_tail++;
717 if (lp->tx_bd_tail >= TX_BD_NUM)
718 lp->tx_bd_tail = 0;
719
720 cur_p = &lp->tx_bd_v[lp->tx_bd_tail];
721 cur_p->phys = dma_map_single(ndev->dev.parent,
722 skb_frag_address(frag),
723 skb_frag_size(frag), DMA_TO_DEVICE);
724 cur_p->len = skb_frag_size(frag);
725 cur_p->app0 = 0;
726 frag++;
727 }
728 cur_p->app0 |= STS_CTRL_APP0_EOP;
729
730 tail_p = lp->tx_bd_p + sizeof(*lp->tx_bd_v) * lp->tx_bd_tail;
731 lp->tx_bd_tail++;
732 if (lp->tx_bd_tail >= TX_BD_NUM)
733 lp->tx_bd_tail = 0;
734
735 skb_tx_timestamp(skb);
736
737 /* Kick off the transfer */
738 lp->dma_out(lp, TX_TAILDESC_PTR, tail_p); /* DMA start */
739
740 return NETDEV_TX_OK;
741 }
742
743
744 static void ll_temac_recv(struct net_device *ndev)
745 {
746 struct temac_local *lp = netdev_priv(ndev);
747 struct sk_buff *skb, *new_skb;
748 unsigned int bdstat;
749 struct cdmac_bd *cur_p;
750 dma_addr_t tail_p;
751 int length;
752 unsigned long flags;
753
754 spin_lock_irqsave(&lp->rx_lock, flags);
755
756 tail_p = lp->rx_bd_p + sizeof(*lp->rx_bd_v) * lp->rx_bd_ci;
757 cur_p = &lp->rx_bd_v[lp->rx_bd_ci];
758
759 bdstat = cur_p->app0;
760 while ((bdstat & STS_CTRL_APP0_CMPLT)) {
761
762 skb = lp->rx_skb[lp->rx_bd_ci];
763 length = cur_p->app4 & 0x3FFF;
764
765 dma_unmap_single(ndev->dev.parent, cur_p->phys, length,
766 DMA_FROM_DEVICE);
767
768 skb_put(skb, length);
769 skb->dev = ndev;
770 skb->protocol = eth_type_trans(skb, ndev);
771 skb_checksum_none_assert(skb);
772
773 /* if we're doing rx csum offload, set it up */
774 if (((lp->temac_features & TEMAC_FEATURE_RX_CSUM) != 0) &&
775 (skb->protocol == __constant_htons(ETH_P_IP)) &&
776 (skb->len > 64)) {
777
778 skb->csum = cur_p->app3 & 0xFFFF;
779 skb->ip_summed = CHECKSUM_COMPLETE;
780 }
781
782 if (!skb_defer_rx_timestamp(skb))
783 netif_rx(skb);
784
785 ndev->stats.rx_packets++;
786 ndev->stats.rx_bytes += length;
787
788 new_skb = netdev_alloc_skb_ip_align(ndev,
789 XTE_MAX_JUMBO_FRAME_SIZE);
790
791 if (new_skb == 0) {
792 dev_err(&ndev->dev, "no memory for new sk_buff\n");
793 spin_unlock_irqrestore(&lp->rx_lock, flags);
794 return;
795 }
796
797 cur_p->app0 = STS_CTRL_APP0_IRQONEND;
798 cur_p->phys = dma_map_single(ndev->dev.parent, new_skb->data,
799 XTE_MAX_JUMBO_FRAME_SIZE,
800 DMA_FROM_DEVICE);
801 cur_p->len = XTE_MAX_JUMBO_FRAME_SIZE;
802 lp->rx_skb[lp->rx_bd_ci] = new_skb;
803
804 lp->rx_bd_ci++;
805 if (lp->rx_bd_ci >= RX_BD_NUM)
806 lp->rx_bd_ci = 0;
807
808 cur_p = &lp->rx_bd_v[lp->rx_bd_ci];
809 bdstat = cur_p->app0;
810 }
811 lp->dma_out(lp, RX_TAILDESC_PTR, tail_p);
812
813 spin_unlock_irqrestore(&lp->rx_lock, flags);
814 }
815
816 static irqreturn_t ll_temac_tx_irq(int irq, void *_ndev)
817 {
818 struct net_device *ndev = _ndev;
819 struct temac_local *lp = netdev_priv(ndev);
820 unsigned int status;
821
822 status = lp->dma_in(lp, TX_IRQ_REG);
823 lp->dma_out(lp, TX_IRQ_REG, status);
824
825 if (status & (IRQ_COAL | IRQ_DLY))
826 temac_start_xmit_done(lp->ndev);
827 if (status & 0x080)
828 dev_err(&ndev->dev, "DMA error 0x%x\n", status);
829
830 return IRQ_HANDLED;
831 }
832
833 static irqreturn_t ll_temac_rx_irq(int irq, void *_ndev)
834 {
835 struct net_device *ndev = _ndev;
836 struct temac_local *lp = netdev_priv(ndev);
837 unsigned int status;
838
839 /* Read and clear the status registers */
840 status = lp->dma_in(lp, RX_IRQ_REG);
841 lp->dma_out(lp, RX_IRQ_REG, status);
842
843 if (status & (IRQ_COAL | IRQ_DLY))
844 ll_temac_recv(lp->ndev);
845
846 return IRQ_HANDLED;
847 }
848
849 static int temac_open(struct net_device *ndev)
850 {
851 struct temac_local *lp = netdev_priv(ndev);
852 int rc;
853
854 dev_dbg(&ndev->dev, "temac_open()\n");
855
856 if (lp->phy_node) {
857 lp->phy_dev = of_phy_connect(lp->ndev, lp->phy_node,
858 temac_adjust_link, 0, 0);
859 if (!lp->phy_dev) {
860 dev_err(lp->dev, "of_phy_connect() failed\n");
861 return -ENODEV;
862 }
863
864 phy_start(lp->phy_dev);
865 }
866
867 temac_device_reset(ndev);
868
869 rc = request_irq(lp->tx_irq, ll_temac_tx_irq, 0, ndev->name, ndev);
870 if (rc)
871 goto err_tx_irq;
872 rc = request_irq(lp->rx_irq, ll_temac_rx_irq, 0, ndev->name, ndev);
873 if (rc)
874 goto err_rx_irq;
875
876 return 0;
877
878 err_rx_irq:
879 free_irq(lp->tx_irq, ndev);
880 err_tx_irq:
881 if (lp->phy_dev)
882 phy_disconnect(lp->phy_dev);
883 lp->phy_dev = NULL;
884 dev_err(lp->dev, "request_irq() failed\n");
885 return rc;
886 }
887
888 static int temac_stop(struct net_device *ndev)
889 {
890 struct temac_local *lp = netdev_priv(ndev);
891
892 dev_dbg(&ndev->dev, "temac_close()\n");
893
894 free_irq(lp->tx_irq, ndev);
895 free_irq(lp->rx_irq, ndev);
896
897 if (lp->phy_dev)
898 phy_disconnect(lp->phy_dev);
899 lp->phy_dev = NULL;
900
901 temac_dma_bd_release(ndev);
902
903 return 0;
904 }
905
906 #ifdef CONFIG_NET_POLL_CONTROLLER
907 static void
908 temac_poll_controller(struct net_device *ndev)
909 {
910 struct temac_local *lp = netdev_priv(ndev);
911
912 disable_irq(lp->tx_irq);
913 disable_irq(lp->rx_irq);
914
915 ll_temac_rx_irq(lp->tx_irq, ndev);
916 ll_temac_tx_irq(lp->rx_irq, ndev);
917
918 enable_irq(lp->tx_irq);
919 enable_irq(lp->rx_irq);
920 }
921 #endif
922
923 static int temac_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd)
924 {
925 struct temac_local *lp = netdev_priv(ndev);
926
927 if (!netif_running(ndev))
928 return -EINVAL;
929
930 if (!lp->phy_dev)
931 return -EINVAL;
932
933 return phy_mii_ioctl(lp->phy_dev, rq, cmd);
934 }
935
936 static const struct net_device_ops temac_netdev_ops = {
937 .ndo_open = temac_open,
938 .ndo_stop = temac_stop,
939 .ndo_start_xmit = temac_start_xmit,
940 .ndo_set_mac_address = netdev_set_mac_address,
941 .ndo_validate_addr = eth_validate_addr,
942 .ndo_do_ioctl = temac_ioctl,
943 #ifdef CONFIG_NET_POLL_CONTROLLER
944 .ndo_poll_controller = temac_poll_controller,
945 #endif
946 };
947
948 /* ---------------------------------------------------------------------
949 * SYSFS device attributes
950 */
951 static ssize_t temac_show_llink_regs(struct device *dev,
952 struct device_attribute *attr, char *buf)
953 {
954 struct net_device *ndev = dev_get_drvdata(dev);
955 struct temac_local *lp = netdev_priv(ndev);
956 int i, len = 0;
957
958 for (i = 0; i < 0x11; i++)
959 len += sprintf(buf + len, "%.8x%s", lp->dma_in(lp, i),
960 (i % 8) == 7 ? "\n" : " ");
961 len += sprintf(buf + len, "\n");
962
963 return len;
964 }
965
966 static DEVICE_ATTR(llink_regs, 0440, temac_show_llink_regs, NULL);
967
968 static struct attribute *temac_device_attrs[] = {
969 &dev_attr_llink_regs.attr,
970 NULL,
971 };
972
973 static const struct attribute_group temac_attr_group = {
974 .attrs = temac_device_attrs,
975 };
976
977 /* ethtool support */
978 static int temac_get_settings(struct net_device *ndev, struct ethtool_cmd *cmd)
979 {
980 struct temac_local *lp = netdev_priv(ndev);
981 return phy_ethtool_gset(lp->phy_dev, cmd);
982 }
983
984 static int temac_set_settings(struct net_device *ndev, struct ethtool_cmd *cmd)
985 {
986 struct temac_local *lp = netdev_priv(ndev);
987 return phy_ethtool_sset(lp->phy_dev, cmd);
988 }
989
990 static int temac_nway_reset(struct net_device *ndev)
991 {
992 struct temac_local *lp = netdev_priv(ndev);
993 return phy_start_aneg(lp->phy_dev);
994 }
995
996 static const struct ethtool_ops temac_ethtool_ops = {
997 .get_settings = temac_get_settings,
998 .set_settings = temac_set_settings,
999 .nway_reset = temac_nway_reset,
1000 .get_link = ethtool_op_get_link,
1001 };
1002
1003 static int __devinit temac_of_probe(struct platform_device *op)
1004 {
1005 struct device_node *np;
1006 struct temac_local *lp;
1007 struct net_device *ndev;
1008 const void *addr;
1009 __be32 *p;
1010 int size, rc = 0;
1011
1012 /* Init network device structure */
1013 ndev = alloc_etherdev(sizeof(*lp));
1014 if (!ndev) {
1015 dev_err(&op->dev, "could not allocate device.\n");
1016 return -ENOMEM;
1017 }
1018 ether_setup(ndev);
1019 dev_set_drvdata(&op->dev, ndev);
1020 SET_NETDEV_DEV(ndev, &op->dev);
1021 ndev->flags &= ~IFF_MULTICAST; /* clear multicast */
1022 ndev->features = NETIF_F_SG | NETIF_F_FRAGLIST;
1023 ndev->netdev_ops = &temac_netdev_ops;
1024 ndev->ethtool_ops = &temac_ethtool_ops;
1025 #if 0
1026 ndev->features |= NETIF_F_IP_CSUM; /* Can checksum TCP/UDP over IPv4. */
1027 ndev->features |= NETIF_F_HW_CSUM; /* Can checksum all the packets. */
1028 ndev->features |= NETIF_F_IPV6_CSUM; /* Can checksum IPV6 TCP/UDP */
1029 ndev->features |= NETIF_F_HIGHDMA; /* Can DMA to high memory. */
1030 ndev->features |= NETIF_F_HW_VLAN_TX; /* Transmit VLAN hw accel */
1031 ndev->features |= NETIF_F_HW_VLAN_RX; /* Receive VLAN hw acceleration */
1032 ndev->features |= NETIF_F_HW_VLAN_FILTER; /* Receive VLAN filtering */
1033 ndev->features |= NETIF_F_VLAN_CHALLENGED; /* cannot handle VLAN pkts */
1034 ndev->features |= NETIF_F_GSO; /* Enable software GSO. */
1035 ndev->features |= NETIF_F_MULTI_QUEUE; /* Has multiple TX/RX queues */
1036 ndev->features |= NETIF_F_LRO; /* large receive offload */
1037 #endif
1038
1039 /* setup temac private info structure */
1040 lp = netdev_priv(ndev);
1041 lp->ndev = ndev;
1042 lp->dev = &op->dev;
1043 lp->options = XTE_OPTION_DEFAULTS;
1044 spin_lock_init(&lp->rx_lock);
1045 mutex_init(&lp->indirect_mutex);
1046
1047 /* map device registers */
1048 lp->regs = of_iomap(op->dev.of_node, 0);
1049 if (!lp->regs) {
1050 dev_err(&op->dev, "could not map temac regs.\n");
1051 goto nodev;
1052 }
1053
1054 /* Setup checksum offload, but default to off if not specified */
1055 lp->temac_features = 0;
1056 p = (__be32 *)of_get_property(op->dev.of_node, "xlnx,txcsum", NULL);
1057 if (p && be32_to_cpu(*p)) {
1058 lp->temac_features |= TEMAC_FEATURE_TX_CSUM;
1059 /* Can checksum TCP/UDP over IPv4. */
1060 ndev->features |= NETIF_F_IP_CSUM;
1061 }
1062 p = (__be32 *)of_get_property(op->dev.of_node, "xlnx,rxcsum", NULL);
1063 if (p && be32_to_cpu(*p))
1064 lp->temac_features |= TEMAC_FEATURE_RX_CSUM;
1065
1066 /* Find the DMA node, map the DMA registers, and decode the DMA IRQs */
1067 np = of_parse_phandle(op->dev.of_node, "llink-connected", 0);
1068 if (!np) {
1069 dev_err(&op->dev, "could not find DMA node\n");
1070 goto err_iounmap;
1071 }
1072
1073 /* Setup the DMA register accesses, could be DCR or memory mapped */
1074 if (temac_dcr_setup(lp, op, np)) {
1075
1076 /* no DCR in the device tree, try non-DCR */
1077 lp->sdma_regs = of_iomap(np, 0);
1078 if (lp->sdma_regs) {
1079 lp->dma_in = temac_dma_in32;
1080 lp->dma_out = temac_dma_out32;
1081 dev_dbg(&op->dev, "MEM base: %p\n", lp->sdma_regs);
1082 } else {
1083 dev_err(&op->dev, "unable to map DMA registers\n");
1084 of_node_put(np);
1085 goto err_iounmap;
1086 }
1087 }
1088
1089 lp->rx_irq = irq_of_parse_and_map(np, 0);
1090 lp->tx_irq = irq_of_parse_and_map(np, 1);
1091
1092 of_node_put(np); /* Finished with the DMA node; drop the reference */
1093
1094 if (!lp->rx_irq || !lp->tx_irq) {
1095 dev_err(&op->dev, "could not determine irqs\n");
1096 rc = -ENOMEM;
1097 goto err_iounmap_2;
1098 }
1099
1100
1101 /* Retrieve the MAC address */
1102 addr = of_get_property(op->dev.of_node, "local-mac-address", &size);
1103 if ((!addr) || (size != 6)) {
1104 dev_err(&op->dev, "could not find MAC address\n");
1105 rc = -ENODEV;
1106 goto err_iounmap_2;
1107 }
1108 temac_set_mac_address(ndev, (void *)addr);
1109
1110 rc = temac_mdio_setup(lp, op->dev.of_node);
1111 if (rc)
1112 dev_warn(&op->dev, "error registering MDIO bus\n");
1113
1114 lp->phy_node = of_parse_phandle(op->dev.of_node, "phy-handle", 0);
1115 if (lp->phy_node)
1116 dev_dbg(lp->dev, "using PHY node %s (%p)\n", np->full_name, np);
1117
1118 /* Add the device attributes */
1119 rc = sysfs_create_group(&lp->dev->kobj, &temac_attr_group);
1120 if (rc) {
1121 dev_err(lp->dev, "Error creating sysfs files\n");
1122 goto err_iounmap_2;
1123 }
1124
1125 rc = register_netdev(lp->ndev);
1126 if (rc) {
1127 dev_err(lp->dev, "register_netdev() error (%i)\n", rc);
1128 goto err_register_ndev;
1129 }
1130
1131 return 0;
1132
1133 err_register_ndev:
1134 sysfs_remove_group(&lp->dev->kobj, &temac_attr_group);
1135 err_iounmap_2:
1136 if (lp->sdma_regs)
1137 iounmap(lp->sdma_regs);
1138 err_iounmap:
1139 iounmap(lp->regs);
1140 nodev:
1141 free_netdev(ndev);
1142 ndev = NULL;
1143 return rc;
1144 }
1145
1146 static int __devexit temac_of_remove(struct platform_device *op)
1147 {
1148 struct net_device *ndev = dev_get_drvdata(&op->dev);
1149 struct temac_local *lp = netdev_priv(ndev);
1150
1151 temac_mdio_teardown(lp);
1152 unregister_netdev(ndev);
1153 sysfs_remove_group(&lp->dev->kobj, &temac_attr_group);
1154 if (lp->phy_node)
1155 of_node_put(lp->phy_node);
1156 lp->phy_node = NULL;
1157 dev_set_drvdata(&op->dev, NULL);
1158 iounmap(lp->regs);
1159 if (lp->sdma_regs)
1160 iounmap(lp->sdma_regs);
1161 free_netdev(ndev);
1162 return 0;
1163 }
1164
1165 static struct of_device_id temac_of_match[] __devinitdata = {
1166 { .compatible = "xlnx,xps-ll-temac-1.01.b", },
1167 { .compatible = "xlnx,xps-ll-temac-2.00.a", },
1168 { .compatible = "xlnx,xps-ll-temac-2.02.a", },
1169 { .compatible = "xlnx,xps-ll-temac-2.03.a", },
1170 {},
1171 };
1172 MODULE_DEVICE_TABLE(of, temac_of_match);
1173
1174 static struct platform_driver temac_of_driver = {
1175 .probe = temac_of_probe,
1176 .remove = __devexit_p(temac_of_remove),
1177 .driver = {
1178 .owner = THIS_MODULE,
1179 .name = "xilinx_temac",
1180 .of_match_table = temac_of_match,
1181 },
1182 };
1183
1184 module_platform_driver(temac_of_driver);
1185
1186 MODULE_DESCRIPTION("Xilinx LL_TEMAC Ethernet driver");
1187 MODULE_AUTHOR("Yoshio Kashiwagi");
1188 MODULE_LICENSE("GPL");