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mac80211: fix race condition caused by late addBA response
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / net / ll_temac_main.c
blob728fe414147a25688d8b96327448a9c5e1a90233
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 }
118
119 /**
120 * temac_dma_in32 - Memory mapped DMA read, this function expects a
121 * register input that is based on DCR word addresses which
122 * are then converted to memory mapped byte addresses
123 */
124 static u32 temac_dma_in32(struct temac_local *lp, int reg)
125 {
126 return in_be32((u32 *)(lp->sdma_regs + (reg << 2)));
127 }
128
129 /**
130 * temac_dma_out32 - Memory mapped DMA read, this function expects a
131 * register input that is based on DCR word addresses which
132 * are then converted to memory mapped byte addresses
133 */
134 static void temac_dma_out32(struct temac_local *lp, int reg, u32 value)
135 {
136 out_be32((u32 *)(lp->sdma_regs + (reg << 2)), value);
137 }
138
139 /* DMA register access functions can be DCR based or memory mapped.
140 * The PowerPC 440 is DCR based, the PowerPC 405 and MicroBlaze are both
141 * memory mapped.
142 */
143 #ifdef CONFIG_PPC_DCR
144
145 /**
146 * temac_dma_dcr_in32 - DCR based DMA read
147 */
148 static u32 temac_dma_dcr_in(struct temac_local *lp, int reg)
149 {
150 return dcr_read(lp->sdma_dcrs, reg);
151 }
152
153 /**
154 * temac_dma_dcr_out32 - DCR based DMA write
155 */
156 static void temac_dma_dcr_out(struct temac_local *lp, int reg, u32 value)
157 {
158 dcr_write(lp->sdma_dcrs, reg, value);
159 }
160
161 /**
162 * temac_dcr_setup - If the DMA is DCR based, then setup the address and
163 * I/O functions
164 */
165 static int temac_dcr_setup(struct temac_local *lp, struct platform_device *op,
166 struct device_node *np)
167 {
168 unsigned int dcrs;
169
170 /* setup the dcr address mapping if it's in the device tree */
171
172 dcrs = dcr_resource_start(np, 0);
173 if (dcrs != 0) {
174 lp->sdma_dcrs = dcr_map(np, dcrs, dcr_resource_len(np, 0));
175 lp->dma_in = temac_dma_dcr_in;
176 lp->dma_out = temac_dma_dcr_out;
177 dev_dbg(&op->dev, "DCR base: %x\n", dcrs);
178 return 0;
179 }
180 /* no DCR in the device tree, indicate a failure */
181 return -1;
182 }
183
184 #else
185
186 /*
187 * temac_dcr_setup - This is a stub for when DCR is not supported,
188 * such as with MicroBlaze
189 */
190 static int temac_dcr_setup(struct temac_local *lp, struct platform_device *op,
191 struct device_node *np)
192 {
193 return -1;
194 }
195
196 #endif
197
198 /**
199 * * temac_dma_bd_release - Release buffer descriptor rings
200 */
201 static void temac_dma_bd_release(struct net_device *ndev)
202 {
203 struct temac_local *lp = netdev_priv(ndev);
204 int i;
205
206 for (i = 0; i < RX_BD_NUM; i++) {
207 if (!lp->rx_skb[i])
208 break;
209 else {
210 dma_unmap_single(ndev->dev.parent, lp->rx_bd_v[i].phys,
211 XTE_MAX_JUMBO_FRAME_SIZE, DMA_FROM_DEVICE);
212 dev_kfree_skb(lp->rx_skb[i]);
213 }
214 }
215 if (lp->rx_bd_v)
216 dma_free_coherent(ndev->dev.parent,
217 sizeof(*lp->rx_bd_v) * RX_BD_NUM,
218 lp->rx_bd_v, lp->rx_bd_p);
219 if (lp->tx_bd_v)
220 dma_free_coherent(ndev->dev.parent,
221 sizeof(*lp->tx_bd_v) * TX_BD_NUM,
222 lp->tx_bd_v, lp->tx_bd_p);
223 if (lp->rx_skb)
224 kfree(lp->rx_skb);
225 }
226
227 /**
228 * temac_dma_bd_init - Setup buffer descriptor rings
229 */
230 static int temac_dma_bd_init(struct net_device *ndev)
231 {
232 struct temac_local *lp = netdev_priv(ndev);
233 struct sk_buff *skb;
234 int i;
235
236 lp->rx_skb = kzalloc(sizeof(*lp->rx_skb) * RX_BD_NUM, GFP_KERNEL);
237 if (!lp->rx_skb) {
238 dev_err(&ndev->dev,
239 "can't allocate memory for DMA RX buffer\n");
240 goto out;
241 }
242 /* allocate the tx and rx ring buffer descriptors. */
243 /* returns a virtual address and a physical address. */
244 lp->tx_bd_v = dma_alloc_coherent(ndev->dev.parent,
245 sizeof(*lp->tx_bd_v) * TX_BD_NUM,
246 &lp->tx_bd_p, GFP_KERNEL);
247 if (!lp->tx_bd_v) {
248 dev_err(&ndev->dev,
249 "unable to allocate DMA TX buffer descriptors");
250 goto out;
251 }
252 lp->rx_bd_v = dma_alloc_coherent(ndev->dev.parent,
253 sizeof(*lp->rx_bd_v) * RX_BD_NUM,
254 &lp->rx_bd_p, GFP_KERNEL);
255 if (!lp->rx_bd_v) {
256 dev_err(&ndev->dev,
257 "unable to allocate DMA RX buffer descriptors");
258 goto out;
259 }
260
261 memset(lp->tx_bd_v, 0, sizeof(*lp->tx_bd_v) * TX_BD_NUM);
262 for (i = 0; i < TX_BD_NUM; i++) {
263 lp->tx_bd_v[i].next = lp->tx_bd_p +
264 sizeof(*lp->tx_bd_v) * ((i + 1) % TX_BD_NUM);
265 }
266
267 memset(lp->rx_bd_v, 0, sizeof(*lp->rx_bd_v) * RX_BD_NUM);
268 for (i = 0; i < RX_BD_NUM; i++) {
269 lp->rx_bd_v[i].next = lp->rx_bd_p +
270 sizeof(*lp->rx_bd_v) * ((i + 1) % RX_BD_NUM);
271
272 skb = netdev_alloc_skb_ip_align(ndev,
273 XTE_MAX_JUMBO_FRAME_SIZE);
274
275 if (skb == 0) {
276 dev_err(&ndev->dev, "alloc_skb error %d\n", i);
277 goto out;
278 }
279 lp->rx_skb[i] = skb;
280 /* returns physical address of skb->data */
281 lp->rx_bd_v[i].phys = dma_map_single(ndev->dev.parent,
282 skb->data,
283 XTE_MAX_JUMBO_FRAME_SIZE,
284 DMA_FROM_DEVICE);
285 lp->rx_bd_v[i].len = XTE_MAX_JUMBO_FRAME_SIZE;
286 lp->rx_bd_v[i].app0 = STS_CTRL_APP0_IRQONEND;
287 }
288
289 lp->dma_out(lp, TX_CHNL_CTRL, 0x10220400 |
290 CHNL_CTRL_IRQ_EN |
291 CHNL_CTRL_IRQ_DLY_EN |
292 CHNL_CTRL_IRQ_COAL_EN);
293 /* 0x10220483 */
294 /* 0x00100483 */
295 lp->dma_out(lp, RX_CHNL_CTRL, 0xff070000 |
296 CHNL_CTRL_IRQ_EN |
297 CHNL_CTRL_IRQ_DLY_EN |
298 CHNL_CTRL_IRQ_COAL_EN |
299 CHNL_CTRL_IRQ_IOE);
300 /* 0xff010283 */
301
302 lp->dma_out(lp, RX_CURDESC_PTR, lp->rx_bd_p);
303 lp->dma_out(lp, RX_TAILDESC_PTR,
304 lp->rx_bd_p + (sizeof(*lp->rx_bd_v) * (RX_BD_NUM - 1)));
305 lp->dma_out(lp, TX_CURDESC_PTR, lp->tx_bd_p);
306
307 return 0;
308
309 out:
310 temac_dma_bd_release(ndev);
311 return -ENOMEM;
312 }
313
314 /* ---------------------------------------------------------------------
315 * net_device_ops
316 */
317
318 static int temac_set_mac_address(struct net_device *ndev, void *address)
319 {
320 struct temac_local *lp = netdev_priv(ndev);
321
322 if (address)
323 memcpy(ndev->dev_addr, address, ETH_ALEN);
324
325 if (!is_valid_ether_addr(ndev->dev_addr))
326 random_ether_addr(ndev->dev_addr);
327
328 /* set up unicast MAC address filter set its mac address */
329 mutex_lock(&lp->indirect_mutex);
330 temac_indirect_out32(lp, XTE_UAW0_OFFSET,
331 (ndev->dev_addr[0]) |
332 (ndev->dev_addr[1] << 8) |
333 (ndev->dev_addr[2] << 16) |
334 (ndev->dev_addr[3] << 24));
335 /* There are reserved bits in EUAW1
336 * so don't affect them Set MAC bits [47:32] in EUAW1 */
337 temac_indirect_out32(lp, XTE_UAW1_OFFSET,
338 (ndev->dev_addr[4] & 0x000000ff) |
339 (ndev->dev_addr[5] << 8));
340 mutex_unlock(&lp->indirect_mutex);
341
342 return 0;
343 }
344
345 static int netdev_set_mac_address(struct net_device *ndev, void *p)
346 {
347 struct sockaddr *addr = p;
348
349 return temac_set_mac_address(ndev, addr->sa_data);
350 }
351
352 static void temac_set_multicast_list(struct net_device *ndev)
353 {
354 struct temac_local *lp = netdev_priv(ndev);
355 u32 multi_addr_msw, multi_addr_lsw, val;
356 int i;
357
358 mutex_lock(&lp->indirect_mutex);
359 if (ndev->flags & (IFF_ALLMULTI | IFF_PROMISC) ||
360 netdev_mc_count(ndev) > MULTICAST_CAM_TABLE_NUM) {
361 /*
362 * We must make the kernel realise we had to move
363 * into promisc mode or we start all out war on
364 * the cable. If it was a promisc request the
365 * flag is already set. If not we assert it.
366 */
367 ndev->flags |= IFF_PROMISC;
368 temac_indirect_out32(lp, XTE_AFM_OFFSET, XTE_AFM_EPPRM_MASK);
369 dev_info(&ndev->dev, "Promiscuous mode enabled.\n");
370 } else if (!netdev_mc_empty(ndev)) {
371 struct netdev_hw_addr *ha;
372
373 i = 0;
374 netdev_for_each_mc_addr(ha, ndev) {
375 if (i >= MULTICAST_CAM_TABLE_NUM)
376 break;
377 multi_addr_msw = ((ha->addr[3] << 24) |
378 (ha->addr[2] << 16) |
379 (ha->addr[1] << 8) |
380 (ha->addr[0]));
381 temac_indirect_out32(lp, XTE_MAW0_OFFSET,
382 multi_addr_msw);
383 multi_addr_lsw = ((ha->addr[5] << 8) |
384 (ha->addr[4]) | (i << 16));
385 temac_indirect_out32(lp, XTE_MAW1_OFFSET,
386 multi_addr_lsw);
387 i++;
388 }
389 } else {
390 val = temac_indirect_in32(lp, XTE_AFM_OFFSET);
391 temac_indirect_out32(lp, XTE_AFM_OFFSET,
392 val & ~XTE_AFM_EPPRM_MASK);
393 temac_indirect_out32(lp, XTE_MAW0_OFFSET, 0);
394 temac_indirect_out32(lp, XTE_MAW1_OFFSET, 0);
395 dev_info(&ndev->dev, "Promiscuous mode disabled.\n");
396 }
397 mutex_unlock(&lp->indirect_mutex);
398 }
399
400 struct temac_option {
401 int flg;
402 u32 opt;
403 u32 reg;
404 u32 m_or;
405 u32 m_and;
406 } temac_options[] = {
407 /* Turn on jumbo packet support for both Rx and Tx */
408 {
409 .opt = XTE_OPTION_JUMBO,
410 .reg = XTE_TXC_OFFSET,
411 .m_or = XTE_TXC_TXJMBO_MASK,
412 },
413 {
414 .opt = XTE_OPTION_JUMBO,
415 .reg = XTE_RXC1_OFFSET,
416 .m_or =XTE_RXC1_RXJMBO_MASK,
417 },
418 /* Turn on VLAN packet support for both Rx and Tx */
419 {
420 .opt = XTE_OPTION_VLAN,
421 .reg = XTE_TXC_OFFSET,
422 .m_or =XTE_TXC_TXVLAN_MASK,
423 },
424 {
425 .opt = XTE_OPTION_VLAN,
426 .reg = XTE_RXC1_OFFSET,
427 .m_or =XTE_RXC1_RXVLAN_MASK,
428 },
429 /* Turn on FCS stripping on receive packets */
430 {
431 .opt = XTE_OPTION_FCS_STRIP,
432 .reg = XTE_RXC1_OFFSET,
433 .m_or =XTE_RXC1_RXFCS_MASK,
434 },
435 /* Turn on FCS insertion on transmit packets */
436 {
437 .opt = XTE_OPTION_FCS_INSERT,
438 .reg = XTE_TXC_OFFSET,
439 .m_or =XTE_TXC_TXFCS_MASK,
440 },
441 /* Turn on length/type field checking on receive packets */
442 {
443 .opt = XTE_OPTION_LENTYPE_ERR,
444 .reg = XTE_RXC1_OFFSET,
445 .m_or =XTE_RXC1_RXLT_MASK,
446 },
447 /* Turn on flow control */
448 {
449 .opt = XTE_OPTION_FLOW_CONTROL,
450 .reg = XTE_FCC_OFFSET,
451 .m_or =XTE_FCC_RXFLO_MASK,
452 },
453 /* Turn on flow control */
454 {
455 .opt = XTE_OPTION_FLOW_CONTROL,
456 .reg = XTE_FCC_OFFSET,
457 .m_or =XTE_FCC_TXFLO_MASK,
458 },
459 /* Turn on promiscuous frame filtering (all frames are received ) */
460 {
461 .opt = XTE_OPTION_PROMISC,
462 .reg = XTE_AFM_OFFSET,
463 .m_or =XTE_AFM_EPPRM_MASK,
464 },
465 /* Enable transmitter if not already enabled */
466 {
467 .opt = XTE_OPTION_TXEN,
468 .reg = XTE_TXC_OFFSET,
469 .m_or =XTE_TXC_TXEN_MASK,
470 },
471 /* Enable receiver? */
472 {
473 .opt = XTE_OPTION_RXEN,
474 .reg = XTE_RXC1_OFFSET,
475 .m_or =XTE_RXC1_RXEN_MASK,
476 },
477 {}
478 };
479
480 /**
481 * temac_setoptions
482 */
483 static u32 temac_setoptions(struct net_device *ndev, u32 options)
484 {
485 struct temac_local *lp = netdev_priv(ndev);
486 struct temac_option *tp = &temac_options[0];
487 int reg;
488
489 mutex_lock(&lp->indirect_mutex);
490 while (tp->opt) {
491 reg = temac_indirect_in32(lp, tp->reg) & ~tp->m_or;
492 if (options & tp->opt)
493 reg |= tp->m_or;
494 temac_indirect_out32(lp, tp->reg, reg);
495 tp++;
496 }
497 lp->options |= options;
498 mutex_unlock(&lp->indirect_mutex);
499
500 return 0;
501 }
502
503 /* Initialize temac */
504 static void temac_device_reset(struct net_device *ndev)
505 {
506 struct temac_local *lp = netdev_priv(ndev);
507 u32 timeout;
508 u32 val;
509
510 /* Perform a software reset */
511
512 /* 0x300 host enable bit ? */
513 /* reset PHY through control register ?:1 */
514
515 dev_dbg(&ndev->dev, "%s()\n", __func__);
516
517 mutex_lock(&lp->indirect_mutex);
518 /* Reset the receiver and wait for it to finish reset */
519 temac_indirect_out32(lp, XTE_RXC1_OFFSET, XTE_RXC1_RXRST_MASK);
520 timeout = 1000;
521 while (temac_indirect_in32(lp, XTE_RXC1_OFFSET) & XTE_RXC1_RXRST_MASK) {
522 udelay(1);
523 if (--timeout == 0) {
524 dev_err(&ndev->dev,
525 "temac_device_reset RX reset timeout!!\n");
526 break;
527 }
528 }
529
530 /* Reset the transmitter and wait for it to finish reset */
531 temac_indirect_out32(lp, XTE_TXC_OFFSET, XTE_TXC_TXRST_MASK);
532 timeout = 1000;
533 while (temac_indirect_in32(lp, XTE_TXC_OFFSET) & XTE_TXC_TXRST_MASK) {
534 udelay(1);
535 if (--timeout == 0) {
536 dev_err(&ndev->dev,
537 "temac_device_reset TX reset timeout!!\n");
538 break;
539 }
540 }
541
542 /* Disable the receiver */
543 val = temac_indirect_in32(lp, XTE_RXC1_OFFSET);
544 temac_indirect_out32(lp, XTE_RXC1_OFFSET, val & ~XTE_RXC1_RXEN_MASK);
545
546 /* Reset Local Link (DMA) */
547 lp->dma_out(lp, DMA_CONTROL_REG, DMA_CONTROL_RST);
548 timeout = 1000;
549 while (lp->dma_in(lp, DMA_CONTROL_REG) & DMA_CONTROL_RST) {
550 udelay(1);
551 if (--timeout == 0) {
552 dev_err(&ndev->dev,
553 "temac_device_reset DMA reset timeout!!\n");
554 break;
555 }
556 }
557 lp->dma_out(lp, DMA_CONTROL_REG, DMA_TAIL_ENABLE);
558
559 if (temac_dma_bd_init(ndev)) {
560 dev_err(&ndev->dev,
561 "temac_device_reset descriptor allocation failed\n");
562 }
563
564 temac_indirect_out32(lp, XTE_RXC0_OFFSET, 0);
565 temac_indirect_out32(lp, XTE_RXC1_OFFSET, 0);
566 temac_indirect_out32(lp, XTE_TXC_OFFSET, 0);
567 temac_indirect_out32(lp, XTE_FCC_OFFSET, XTE_FCC_RXFLO_MASK);
568
569 mutex_unlock(&lp->indirect_mutex);
570
571 /* Sync default options with HW
572 * but leave receiver and transmitter disabled. */
573 temac_setoptions(ndev,
574 lp->options & ~(XTE_OPTION_TXEN | XTE_OPTION_RXEN));
575
576 temac_set_mac_address(ndev, NULL);
577
578 /* Set address filter table */
579 temac_set_multicast_list(ndev);
580 if (temac_setoptions(ndev, lp->options))
581 dev_err(&ndev->dev, "Error setting TEMAC options\n");
582
583 /* Init Driver variable */
584 ndev->trans_start = jiffies; /* prevent tx timeout */
585 }
586
587 void temac_adjust_link(struct net_device *ndev)
588 {
589 struct temac_local *lp = netdev_priv(ndev);
590 struct phy_device *phy = lp->phy_dev;
591 u32 mii_speed;
592 int link_state;
593
594 /* hash together the state values to decide if something has changed */
595 link_state = phy->speed | (phy->duplex << 1) | phy->link;
596
597 mutex_lock(&lp->indirect_mutex);
598 if (lp->last_link != link_state) {
599 mii_speed = temac_indirect_in32(lp, XTE_EMCFG_OFFSET);
600 mii_speed &= ~XTE_EMCFG_LINKSPD_MASK;
601
602 switch (phy->speed) {
603 case SPEED_1000: mii_speed |= XTE_EMCFG_LINKSPD_1000; break;
604 case SPEED_100: mii_speed |= XTE_EMCFG_LINKSPD_100; break;
605 case SPEED_10: mii_speed |= XTE_EMCFG_LINKSPD_10; break;
606 }
607
608 /* Write new speed setting out to TEMAC */
609 temac_indirect_out32(lp, XTE_EMCFG_OFFSET, mii_speed);
610 lp->last_link = link_state;
611 phy_print_status(phy);
612 }
613 mutex_unlock(&lp->indirect_mutex);
614 }
615
616 static void temac_start_xmit_done(struct net_device *ndev)
617 {
618 struct temac_local *lp = netdev_priv(ndev);
619 struct cdmac_bd *cur_p;
620 unsigned int stat = 0;
621
622 cur_p = &lp->tx_bd_v[lp->tx_bd_ci];
623 stat = cur_p->app0;
624
625 while (stat & STS_CTRL_APP0_CMPLT) {
626 dma_unmap_single(ndev->dev.parent, cur_p->phys, cur_p->len,
627 DMA_TO_DEVICE);
628 if (cur_p->app4)
629 dev_kfree_skb_irq((struct sk_buff *)cur_p->app4);
630 cur_p->app0 = 0;
631 cur_p->app1 = 0;
632 cur_p->app2 = 0;
633 cur_p->app3 = 0;
634 cur_p->app4 = 0;
635
636 ndev->stats.tx_packets++;
637 ndev->stats.tx_bytes += cur_p->len;
638
639 lp->tx_bd_ci++;
640 if (lp->tx_bd_ci >= TX_BD_NUM)
641 lp->tx_bd_ci = 0;
642
643 cur_p = &lp->tx_bd_v[lp->tx_bd_ci];
644 stat = cur_p->app0;
645 }
646
647 netif_wake_queue(ndev);
648 }
649
650 static inline int temac_check_tx_bd_space(struct temac_local *lp, int num_frag)
651 {
652 struct cdmac_bd *cur_p;
653 int tail;
654
655 tail = lp->tx_bd_tail;
656 cur_p = &lp->tx_bd_v[tail];
657
658 do {
659 if (cur_p->app0)
660 return NETDEV_TX_BUSY;
661
662 tail++;
663 if (tail >= TX_BD_NUM)
664 tail = 0;
665
666 cur_p = &lp->tx_bd_v[tail];
667 num_frag--;
668 } while (num_frag >= 0);
669
670 return 0;
671 }
672
673 static int temac_start_xmit(struct sk_buff *skb, struct net_device *ndev)
674 {
675 struct temac_local *lp = netdev_priv(ndev);
676 struct cdmac_bd *cur_p;
677 dma_addr_t start_p, tail_p;
678 int ii;
679 unsigned long num_frag;
680 skb_frag_t *frag;
681
682 num_frag = skb_shinfo(skb)->nr_frags;
683 frag = &skb_shinfo(skb)->frags[0];
684 start_p = lp->tx_bd_p + sizeof(*lp->tx_bd_v) * lp->tx_bd_tail;
685 cur_p = &lp->tx_bd_v[lp->tx_bd_tail];
686
687 if (temac_check_tx_bd_space(lp, num_frag)) {
688 if (!netif_queue_stopped(ndev)) {
689 netif_stop_queue(ndev);
690 return NETDEV_TX_BUSY;
691 }
692 return NETDEV_TX_BUSY;
693 }
694
695 cur_p->app0 = 0;
696 if (skb->ip_summed == CHECKSUM_PARTIAL) {
697 unsigned int csum_start_off = skb_checksum_start_offset(skb);
698 unsigned int csum_index_off = csum_start_off + skb->csum_offset;
699
700 cur_p->app0 |= 1; /* TX Checksum Enabled */
701 cur_p->app1 = (csum_start_off << 16) | csum_index_off;
702 cur_p->app2 = 0; /* initial checksum seed */
703 }
704
705 cur_p->app0 |= STS_CTRL_APP0_SOP;
706 cur_p->len = skb_headlen(skb);
707 cur_p->phys = dma_map_single(ndev->dev.parent, skb->data, skb->len,
708 DMA_TO_DEVICE);
709 cur_p->app4 = (unsigned long)skb;
710
711 for (ii = 0; ii < num_frag; ii++) {
712 lp->tx_bd_tail++;
713 if (lp->tx_bd_tail >= TX_BD_NUM)
714 lp->tx_bd_tail = 0;
715
716 cur_p = &lp->tx_bd_v[lp->tx_bd_tail];
717 cur_p->phys = dma_map_single(ndev->dev.parent,
718 (void *)page_address(frag->page) +
719 frag->page_offset,
720 frag->size, DMA_TO_DEVICE);
721 cur_p->len = frag->size;
722 cur_p->app0 = 0;
723 frag++;
724 }
725 cur_p->app0 |= STS_CTRL_APP0_EOP;
726
727 tail_p = lp->tx_bd_p + sizeof(*lp->tx_bd_v) * lp->tx_bd_tail;
728 lp->tx_bd_tail++;
729 if (lp->tx_bd_tail >= TX_BD_NUM)
730 lp->tx_bd_tail = 0;
731
732 skb_tx_timestamp(skb);
733
734 /* Kick off the transfer */
735 lp->dma_out(lp, TX_TAILDESC_PTR, tail_p); /* DMA start */
736
737 return NETDEV_TX_OK;
738 }
739
740
741 static void ll_temac_recv(struct net_device *ndev)
742 {
743 struct temac_local *lp = netdev_priv(ndev);
744 struct sk_buff *skb, *new_skb;
745 unsigned int bdstat;
746 struct cdmac_bd *cur_p;
747 dma_addr_t tail_p;
748 int length;
749 unsigned long flags;
750
751 spin_lock_irqsave(&lp->rx_lock, flags);
752
753 tail_p = lp->rx_bd_p + sizeof(*lp->rx_bd_v) * lp->rx_bd_ci;
754 cur_p = &lp->rx_bd_v[lp->rx_bd_ci];
755
756 bdstat = cur_p->app0;
757 while ((bdstat & STS_CTRL_APP0_CMPLT)) {
758
759 skb = lp->rx_skb[lp->rx_bd_ci];
760 length = cur_p->app4 & 0x3FFF;
761
762 dma_unmap_single(ndev->dev.parent, cur_p->phys, length,
763 DMA_FROM_DEVICE);
764
765 skb_put(skb, length);
766 skb->dev = ndev;
767 skb->protocol = eth_type_trans(skb, ndev);
768 skb_checksum_none_assert(skb);
769
770 /* if we're doing rx csum offload, set it up */
771 if (((lp->temac_features & TEMAC_FEATURE_RX_CSUM) != 0) &&
772 (skb->protocol == __constant_htons(ETH_P_IP)) &&
773 (skb->len > 64)) {
774
775 skb->csum = cur_p->app3 & 0xFFFF;
776 skb->ip_summed = CHECKSUM_COMPLETE;
777 }
778
779 if (!skb_defer_rx_timestamp(skb))
780 netif_rx(skb);
781
782 ndev->stats.rx_packets++;
783 ndev->stats.rx_bytes += length;
784
785 new_skb = netdev_alloc_skb_ip_align(ndev,
786 XTE_MAX_JUMBO_FRAME_SIZE);
787
788 if (new_skb == 0) {
789 dev_err(&ndev->dev, "no memory for new sk_buff\n");
790 spin_unlock_irqrestore(&lp->rx_lock, flags);
791 return;
792 }
793
794 cur_p->app0 = STS_CTRL_APP0_IRQONEND;
795 cur_p->phys = dma_map_single(ndev->dev.parent, new_skb->data,
796 XTE_MAX_JUMBO_FRAME_SIZE,
797 DMA_FROM_DEVICE);
798 cur_p->len = XTE_MAX_JUMBO_FRAME_SIZE;
799 lp->rx_skb[lp->rx_bd_ci] = new_skb;
800
801 lp->rx_bd_ci++;
802 if (lp->rx_bd_ci >= RX_BD_NUM)
803 lp->rx_bd_ci = 0;
804
805 cur_p = &lp->rx_bd_v[lp->rx_bd_ci];
806 bdstat = cur_p->app0;
807 }
808 lp->dma_out(lp, RX_TAILDESC_PTR, tail_p);
809
810 spin_unlock_irqrestore(&lp->rx_lock, flags);
811 }
812
813 static irqreturn_t ll_temac_tx_irq(int irq, void *_ndev)
814 {
815 struct net_device *ndev = _ndev;
816 struct temac_local *lp = netdev_priv(ndev);
817 unsigned int status;
818
819 status = lp->dma_in(lp, TX_IRQ_REG);
820 lp->dma_out(lp, TX_IRQ_REG, status);
821
822 if (status & (IRQ_COAL | IRQ_DLY))
823 temac_start_xmit_done(lp->ndev);
824 if (status & 0x080)
825 dev_err(&ndev->dev, "DMA error 0x%x\n", status);
826
827 return IRQ_HANDLED;
828 }
829
830 static irqreturn_t ll_temac_rx_irq(int irq, void *_ndev)
831 {
832 struct net_device *ndev = _ndev;
833 struct temac_local *lp = netdev_priv(ndev);
834 unsigned int status;
835
836 /* Read and clear the status registers */
837 status = lp->dma_in(lp, RX_IRQ_REG);
838 lp->dma_out(lp, RX_IRQ_REG, status);
839
840 if (status & (IRQ_COAL | IRQ_DLY))
841 ll_temac_recv(lp->ndev);
842
843 return IRQ_HANDLED;
844 }
845
846 static int temac_open(struct net_device *ndev)
847 {
848 struct temac_local *lp = netdev_priv(ndev);
849 int rc;
850
851 dev_dbg(&ndev->dev, "temac_open()\n");
852
853 if (lp->phy_node) {
854 lp->phy_dev = of_phy_connect(lp->ndev, lp->phy_node,
855 temac_adjust_link, 0, 0);
856 if (!lp->phy_dev) {
857 dev_err(lp->dev, "of_phy_connect() failed\n");
858 return -ENODEV;
859 }
860
861 phy_start(lp->phy_dev);
862 }
863
864 rc = request_irq(lp->tx_irq, ll_temac_tx_irq, 0, ndev->name, ndev);
865 if (rc)
866 goto err_tx_irq;
867 rc = request_irq(lp->rx_irq, ll_temac_rx_irq, 0, ndev->name, ndev);
868 if (rc)
869 goto err_rx_irq;
870
871 temac_device_reset(ndev);
872 return 0;
873
874 err_rx_irq:
875 free_irq(lp->tx_irq, ndev);
876 err_tx_irq:
877 if (lp->phy_dev)
878 phy_disconnect(lp->phy_dev);
879 lp->phy_dev = NULL;
880 dev_err(lp->dev, "request_irq() failed\n");
881 return rc;
882 }
883
884 static int temac_stop(struct net_device *ndev)
885 {
886 struct temac_local *lp = netdev_priv(ndev);
887
888 dev_dbg(&ndev->dev, "temac_close()\n");
889
890 free_irq(lp->tx_irq, ndev);
891 free_irq(lp->rx_irq, ndev);
892
893 if (lp->phy_dev)
894 phy_disconnect(lp->phy_dev);
895 lp->phy_dev = NULL;
896
897 temac_dma_bd_release(ndev);
898
899 return 0;
900 }
901
902 #ifdef CONFIG_NET_POLL_CONTROLLER
903 static void
904 temac_poll_controller(struct net_device *ndev)
905 {
906 struct temac_local *lp = netdev_priv(ndev);
907
908 disable_irq(lp->tx_irq);
909 disable_irq(lp->rx_irq);
910
911 ll_temac_rx_irq(lp->tx_irq, ndev);
912 ll_temac_tx_irq(lp->rx_irq, ndev);
913
914 enable_irq(lp->tx_irq);
915 enable_irq(lp->rx_irq);
916 }
917 #endif
918
919 static const struct net_device_ops temac_netdev_ops = {
920 .ndo_open = temac_open,
921 .ndo_stop = temac_stop,
922 .ndo_start_xmit = temac_start_xmit,
923 .ndo_set_mac_address = netdev_set_mac_address,
924 .ndo_validate_addr = eth_validate_addr,
925 //.ndo_set_multicast_list = temac_set_multicast_list,
926 #ifdef CONFIG_NET_POLL_CONTROLLER
927 .ndo_poll_controller = temac_poll_controller,
928 #endif
929 };
930
931 /* ---------------------------------------------------------------------
932 * SYSFS device attributes
933 */
934 static ssize_t temac_show_llink_regs(struct device *dev,
935 struct device_attribute *attr, char *buf)
936 {
937 struct net_device *ndev = dev_get_drvdata(dev);
938 struct temac_local *lp = netdev_priv(ndev);
939 int i, len = 0;
940
941 for (i = 0; i < 0x11; i++)
942 len += sprintf(buf + len, "%.8x%s", lp->dma_in(lp, i),
943 (i % 8) == 7 ? "\n" : " ");
944 len += sprintf(buf + len, "\n");
945
946 return len;
947 }
948
949 static DEVICE_ATTR(llink_regs, 0440, temac_show_llink_regs, NULL);
950
951 static struct attribute *temac_device_attrs[] = {
952 &dev_attr_llink_regs.attr,
953 NULL,
954 };
955
956 static const struct attribute_group temac_attr_group = {
957 .attrs = temac_device_attrs,
958 };
959
960 static int __devinit temac_of_probe(struct platform_device *op)
961 {
962 struct device_node *np;
963 struct temac_local *lp;
964 struct net_device *ndev;
965 const void *addr;
966 __be32 *p;
967 int size, rc = 0;
968
969 /* Init network device structure */
970 ndev = alloc_etherdev(sizeof(*lp));
971 if (!ndev) {
972 dev_err(&op->dev, "could not allocate device.\n");
973 return -ENOMEM;
974 }
975 ether_setup(ndev);
976 dev_set_drvdata(&op->dev, ndev);
977 SET_NETDEV_DEV(ndev, &op->dev);
978 ndev->flags &= ~IFF_MULTICAST; /* clear multicast */
979 ndev->features = NETIF_F_SG | NETIF_F_FRAGLIST;
980 ndev->netdev_ops = &temac_netdev_ops;
981 #if 0
982 ndev->features |= NETIF_F_IP_CSUM; /* Can checksum TCP/UDP over IPv4. */
983 ndev->features |= NETIF_F_HW_CSUM; /* Can checksum all the packets. */
984 ndev->features |= NETIF_F_IPV6_CSUM; /* Can checksum IPV6 TCP/UDP */
985 ndev->features |= NETIF_F_HIGHDMA; /* Can DMA to high memory. */
986 ndev->features |= NETIF_F_HW_VLAN_TX; /* Transmit VLAN hw accel */
987 ndev->features |= NETIF_F_HW_VLAN_RX; /* Receive VLAN hw acceleration */
988 ndev->features |= NETIF_F_HW_VLAN_FILTER; /* Receive VLAN filtering */
989 ndev->features |= NETIF_F_VLAN_CHALLENGED; /* cannot handle VLAN pkts */
990 ndev->features |= NETIF_F_GSO; /* Enable software GSO. */
991 ndev->features |= NETIF_F_MULTI_QUEUE; /* Has multiple TX/RX queues */
992 ndev->features |= NETIF_F_LRO; /* large receive offload */
993 #endif
994
995 /* setup temac private info structure */
996 lp = netdev_priv(ndev);
997 lp->ndev = ndev;
998 lp->dev = &op->dev;
999 lp->options = XTE_OPTION_DEFAULTS;
1000 spin_lock_init(&lp->rx_lock);
1001 mutex_init(&lp->indirect_mutex);
1002
1003 /* map device registers */
1004 lp->regs = of_iomap(op->dev.of_node, 0);
1005 if (!lp->regs) {
1006 dev_err(&op->dev, "could not map temac regs.\n");
1007 goto nodev;
1008 }
1009
1010 /* Setup checksum offload, but default to off if not specified */
1011 lp->temac_features = 0;
1012 p = (__be32 *)of_get_property(op->dev.of_node, "xlnx,txcsum", NULL);
1013 if (p && be32_to_cpu(*p)) {
1014 lp->temac_features |= TEMAC_FEATURE_TX_CSUM;
1015 /* Can checksum TCP/UDP over IPv4. */
1016 ndev->features |= NETIF_F_IP_CSUM;
1017 }
1018 p = (__be32 *)of_get_property(op->dev.of_node, "xlnx,rxcsum", NULL);
1019 if (p && be32_to_cpu(*p))
1020 lp->temac_features |= TEMAC_FEATURE_RX_CSUM;
1021
1022 /* Find the DMA node, map the DMA registers, and decode the DMA IRQs */
1023 np = of_parse_phandle(op->dev.of_node, "llink-connected", 0);
1024 if (!np) {
1025 dev_err(&op->dev, "could not find DMA node\n");
1026 goto err_iounmap;
1027 }
1028
1029 /* Setup the DMA register accesses, could be DCR or memory mapped */
1030 if (temac_dcr_setup(lp, op, np)) {
1031
1032 /* no DCR in the device tree, try non-DCR */
1033 lp->sdma_regs = of_iomap(np, 0);
1034 if (lp->sdma_regs) {
1035 lp->dma_in = temac_dma_in32;
1036 lp->dma_out = temac_dma_out32;
1037 dev_dbg(&op->dev, "MEM base: %p\n", lp->sdma_regs);
1038 } else {
1039 dev_err(&op->dev, "unable to map DMA registers\n");
1040 of_node_put(np);
1041 goto err_iounmap;
1042 }
1043 }
1044
1045 lp->rx_irq = irq_of_parse_and_map(np, 0);
1046 lp->tx_irq = irq_of_parse_and_map(np, 1);
1047
1048 of_node_put(np); /* Finished with the DMA node; drop the reference */
1049
1050 if ((lp->rx_irq == NO_IRQ) || (lp->tx_irq == NO_IRQ)) {
1051 dev_err(&op->dev, "could not determine irqs\n");
1052 rc = -ENOMEM;
1053 goto err_iounmap_2;
1054 }
1055
1056
1057 /* Retrieve the MAC address */
1058 addr = of_get_property(op->dev.of_node, "local-mac-address", &size);
1059 if ((!addr) || (size != 6)) {
1060 dev_err(&op->dev, "could not find MAC address\n");
1061 rc = -ENODEV;
1062 goto err_iounmap_2;
1063 }
1064 temac_set_mac_address(ndev, (void *)addr);
1065
1066 rc = temac_mdio_setup(lp, op->dev.of_node);
1067 if (rc)
1068 dev_warn(&op->dev, "error registering MDIO bus\n");
1069
1070 lp->phy_node = of_parse_phandle(op->dev.of_node, "phy-handle", 0);
1071 if (lp->phy_node)
1072 dev_dbg(lp->dev, "using PHY node %s (%p)\n", np->full_name, np);
1073
1074 /* Add the device attributes */
1075 rc = sysfs_create_group(&lp->dev->kobj, &temac_attr_group);
1076 if (rc) {
1077 dev_err(lp->dev, "Error creating sysfs files\n");
1078 goto err_iounmap_2;
1079 }
1080
1081 rc = register_netdev(lp->ndev);
1082 if (rc) {
1083 dev_err(lp->dev, "register_netdev() error (%i)\n", rc);
1084 goto err_register_ndev;
1085 }
1086
1087 return 0;
1088
1089 err_register_ndev:
1090 sysfs_remove_group(&lp->dev->kobj, &temac_attr_group);
1091 err_iounmap_2:
1092 if (lp->sdma_regs)
1093 iounmap(lp->sdma_regs);
1094 err_iounmap:
1095 iounmap(lp->regs);
1096 nodev:
1097 free_netdev(ndev);
1098 ndev = NULL;
1099 return rc;
1100 }
1101
1102 static int __devexit temac_of_remove(struct platform_device *op)
1103 {
1104 struct net_device *ndev = dev_get_drvdata(&op->dev);
1105 struct temac_local *lp = netdev_priv(ndev);
1106
1107 temac_mdio_teardown(lp);
1108 unregister_netdev(ndev);
1109 sysfs_remove_group(&lp->dev->kobj, &temac_attr_group);
1110 if (lp->phy_node)
1111 of_node_put(lp->phy_node);
1112 lp->phy_node = NULL;
1113 dev_set_drvdata(&op->dev, NULL);
1114 iounmap(lp->regs);
1115 if (lp->sdma_regs)
1116 iounmap(lp->sdma_regs);
1117 free_netdev(ndev);
1118 return 0;
1119 }
1120
1121 static struct of_device_id temac_of_match[] __devinitdata = {
1122 { .compatible = "xlnx,xps-ll-temac-1.01.b", },
1123 { .compatible = "xlnx,xps-ll-temac-2.00.a", },
1124 { .compatible = "xlnx,xps-ll-temac-2.02.a", },
1125 { .compatible = "xlnx,xps-ll-temac-2.03.a", },
1126 {},
1127 };
1128 MODULE_DEVICE_TABLE(of, temac_of_match);
1129
1130 static struct platform_driver temac_of_driver = {
1131 .probe = temac_of_probe,
1132 .remove = __devexit_p(temac_of_remove),
1133 .driver = {
1134 .owner = THIS_MODULE,
1135 .name = "xilinx_temac",
1136 .of_match_table = temac_of_match,
1137 },
1138 };
1139
1140 static int __init temac_init(void)
1141 {
1142 return platform_driver_register(&temac_of_driver);
1143 }
1144 module_init(temac_init);
1145
1146 static void __exit temac_exit(void)
1147 {
1148 platform_driver_unregister(&temac_of_driver);
1149 }
1150 module_exit(temac_exit);
1151
1152 MODULE_DESCRIPTION("Xilinx LL_TEMAC Ethernet driver");
1153 MODULE_AUTHOR("Yoshio Kashiwagi");
1154 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree