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