1 /*
2 * PXA168 ethernet driver.
3 * Most of the code is derived from mv643xx ethernet driver.
4 *
5 * Copyright (C) 2010 Marvell International Ltd.
6 * Sachin Sanap <ssanap@marvell.com>
7 * Zhangfei Gao <zgao6@marvell.com>
8 * Philip Rakity <prakity@marvell.com>
9 * Mark Brown <markb@marvell.com>
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version 2
14 * of the License, or (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, see <http://www.gnu.org/licenses/>.
23 */
24
25 #include <linux/bitops.h>
26 #include <linux/clk.h>
27 #include <linux/delay.h>
28 #include <linux/dma-mapping.h>
29 #include <linux/etherdevice.h>
30 #include <linux/ethtool.h>
31 #include <linux/in.h>
32 #include <linux/interrupt.h>
33 #include <linux/io.h>
34 #include <linux/ip.h>
35 #include <linux/kernel.h>
36 #include <linux/module.h>
37 #include <linux/of.h>
38 #include <linux/of_net.h>
39 #include <linux/phy.h>
40 #include <linux/platform_device.h>
41 #include <linux/pxa168_eth.h>
42 #include <linux/tcp.h>
43 #include <linux/types.h>
44 #include <linux/udp.h>
45 #include <linux/workqueue.h>
46
47 #include <asm/pgtable.h>
48 #include <asm/cacheflush.h>
49
50 #define DRIVER_NAME "pxa168-eth"
51 #define DRIVER_VERSION "0.3"
52
53 /*
54 * Registers
55 */
56
57 #define PHY_ADDRESS 0x0000
58 #define SMI 0x0010
59 #define PORT_CONFIG 0x0400
60 #define PORT_CONFIG_EXT 0x0408
61 #define PORT_COMMAND 0x0410
62 #define PORT_STATUS 0x0418
63 #define HTPR 0x0428
64 #define MAC_ADDR_LOW 0x0430
65 #define MAC_ADDR_HIGH 0x0438
66 #define SDMA_CONFIG 0x0440
67 #define SDMA_CMD 0x0448
68 #define INT_CAUSE 0x0450
69 #define INT_W_CLEAR 0x0454
70 #define INT_MASK 0x0458
71 #define ETH_F_RX_DESC_0 0x0480
72 #define ETH_C_RX_DESC_0 0x04A0
73 #define ETH_C_TX_DESC_1 0x04E4
74
75 /* smi register */
76 #define SMI_BUSY (1 << 28) /* 0 - Write, 1 - Read */
77 #define SMI_R_VALID (1 << 27) /* 0 - Write, 1 - Read */
78 #define SMI_OP_W (0 << 26) /* Write operation */
79 #define SMI_OP_R (1 << 26) /* Read operation */
80
81 #define PHY_WAIT_ITERATIONS 10
82
83 #define PXA168_ETH_PHY_ADDR_DEFAULT 0
84 /* RX & TX descriptor command */
85 #define BUF_OWNED_BY_DMA (1 << 31)
86
87 /* RX descriptor status */
88 #define RX_EN_INT (1 << 23)
89 #define RX_FIRST_DESC (1 << 17)
90 #define RX_LAST_DESC (1 << 16)
91 #define RX_ERROR (1 << 15)
92
93 /* TX descriptor command */
94 #define TX_EN_INT (1 << 23)
95 #define TX_GEN_CRC (1 << 22)
96 #define TX_ZERO_PADDING (1 << 18)
97 #define TX_FIRST_DESC (1 << 17)
98 #define TX_LAST_DESC (1 << 16)
99 #define TX_ERROR (1 << 15)
100
101 /* SDMA_CMD */
102 #define SDMA_CMD_AT (1 << 31)
103 #define SDMA_CMD_TXDL (1 << 24)
104 #define SDMA_CMD_TXDH (1 << 23)
105 #define SDMA_CMD_AR (1 << 15)
106 #define SDMA_CMD_ERD (1 << 7)
107
108 /* Bit definitions of the Port Config Reg */
109 #define PCR_DUPLEX_FULL (1 << 15)
110 #define PCR_HS (1 << 12)
111 #define PCR_EN (1 << 7)
112 #define PCR_PM (1 << 0)
113
114 /* Bit definitions of the Port Config Extend Reg */
115 #define PCXR_2BSM (1 << 28)
116 #define PCXR_DSCP_EN (1 << 21)
117 #define PCXR_RMII_EN (1 << 20)
118 #define PCXR_AN_SPEED_DIS (1 << 19)
119 #define PCXR_SPEED_100 (1 << 18)
120 #define PCXR_MFL_1518 (0 << 14)
121 #define PCXR_MFL_1536 (1 << 14)
122 #define PCXR_MFL_2048 (2 << 14)
123 #define PCXR_MFL_64K (3 << 14)
124 #define PCXR_FLOWCTL_DIS (1 << 12)
125 #define PCXR_FLP (1 << 11)
126 #define PCXR_AN_FLOWCTL_DIS (1 << 10)
127 #define PCXR_AN_DUPLEX_DIS (1 << 9)
128 #define PCXR_PRIO_TX_OFF 3
129 #define PCXR_TX_HIGH_PRI (7 << PCXR_PRIO_TX_OFF)
130
131 /* Bit definitions of the SDMA Config Reg */
132 #define SDCR_BSZ_OFF 12
133 #define SDCR_BSZ8 (3 << SDCR_BSZ_OFF)
134 #define SDCR_BSZ4 (2 << SDCR_BSZ_OFF)
135 #define SDCR_BSZ2 (1 << SDCR_BSZ_OFF)
136 #define SDCR_BSZ1 (0 << SDCR_BSZ_OFF)
137 #define SDCR_BLMR (1 << 6)
138 #define SDCR_BLMT (1 << 7)
139 #define SDCR_RIFB (1 << 9)
140 #define SDCR_RC_OFF 2
141 #define SDCR_RC_MAX_RETRANS (0xf << SDCR_RC_OFF)
142
143 /*
144 * Bit definitions of the Interrupt Cause Reg
145 * and Interrupt MASK Reg is the same
146 */
147 #define ICR_RXBUF (1 << 0)
148 #define ICR_TXBUF_H (1 << 2)
149 #define ICR_TXBUF_L (1 << 3)
150 #define ICR_TXEND_H (1 << 6)
151 #define ICR_TXEND_L (1 << 7)
152 #define ICR_RXERR (1 << 8)
153 #define ICR_TXERR_H (1 << 10)
154 #define ICR_TXERR_L (1 << 11)
155 #define ICR_TX_UDR (1 << 13)
156 #define ICR_MII_CH (1 << 28)
157
158 #define ALL_INTS (ICR_TXBUF_H | ICR_TXBUF_L | ICR_TX_UDR |\
159 ICR_TXERR_H | ICR_TXERR_L |\
160 ICR_TXEND_H | ICR_TXEND_L |\
161 ICR_RXBUF | ICR_RXERR | ICR_MII_CH)
162
163 #define ETH_HW_IP_ALIGN 2 /* hw aligns IP header */
164
165 #define NUM_RX_DESCS 64
166 #define NUM_TX_DESCS 64
167
168 #define HASH_ADD 0
169 #define HASH_DELETE 1
170 #define HASH_ADDR_TABLE_SIZE 0x4000 /* 16K (1/2K address - PCR_HS == 1) */
171 #define HOP_NUMBER 12
172
173 /* Bit definitions for Port status */
174 #define PORT_SPEED_100 (1 << 0)
175 #define FULL_DUPLEX (1 << 1)
176 #define FLOW_CONTROL_DISABLED (1 << 2)
177 #define LINK_UP (1 << 3)
178
179 /* Bit definitions for work to be done */
180 #define WORK_TX_DONE (1 << 1)
181
182 /*
183 * Misc definitions.
184 */
185 #define SKB_DMA_REALIGN ((PAGE_SIZE - NET_SKB_PAD) % SMP_CACHE_BYTES)
186
187 struct rx_desc {
188 u32 cmd_sts; /* Descriptor command status */
189 u16 byte_cnt; /* Descriptor buffer byte count */
190 u16 buf_size; /* Buffer size */
191 u32 buf_ptr; /* Descriptor buffer pointer */
192 u32 next_desc_ptr; /* Next descriptor pointer */
193 };
194
195 struct tx_desc {
196 u32 cmd_sts; /* Command/status field */
197 u16 reserved;
198 u16 byte_cnt; /* buffer byte count */
199 u32 buf_ptr; /* pointer to buffer for this descriptor */
200 u32 next_desc_ptr; /* Pointer to next descriptor */
201 };
202
203 struct pxa168_eth_private {
204 int port_num; /* User Ethernet port number */
205 int phy_addr;
206 int phy_speed;
207 int phy_duplex;
208 phy_interface_t phy_intf;
209
210 int rx_resource_err; /* Rx ring resource error flag */
211
212 /* Next available and first returning Rx resource */
213 int rx_curr_desc_q, rx_used_desc_q;
214
215 /* Next available and first returning Tx resource */
216 int tx_curr_desc_q, tx_used_desc_q;
217
218 struct rx_desc *p_rx_desc_area;
219 dma_addr_t rx_desc_dma;
220 int rx_desc_area_size;
221 struct sk_buff **rx_skb;
222
223 struct tx_desc *p_tx_desc_area;
224 dma_addr_t tx_desc_dma;
225 int tx_desc_area_size;
226 struct sk_buff **tx_skb;
227
228 struct work_struct tx_timeout_task;
229
230 struct net_device *dev;
231 struct napi_struct napi;
232 u8 work_todo;
233 int skb_size;
234
235 /* Size of Tx Ring per queue */
236 int tx_ring_size;
237 /* Number of tx descriptors in use */
238 int tx_desc_count;
239 /* Size of Rx Ring per queue */
240 int rx_ring_size;
241 /* Number of rx descriptors in use */
242 int rx_desc_count;
243
244 /*
245 * Used in case RX Ring is empty, which can occur when
246 * system does not have resources (skb's)
247 */
248 struct timer_list timeout;
249 struct mii_bus *smi_bus;
250
251 /* clock */
252 struct clk *clk;
253 struct pxa168_eth_platform_data *pd;
254 /*
255 * Ethernet controller base address.
256 */
257 void __iomem *base;
258
259 /* Pointer to the hardware address filter table */
260 void *htpr;
261 dma_addr_t htpr_dma;
262 };
263
264 struct addr_table_entry {
265 __le32 lo;
266 __le32 hi;
267 };
268
269 /* Bit fields of a Hash Table Entry */
270 enum hash_table_entry {
271 HASH_ENTRY_VALID = 1,
272 SKIP = 2,
273 HASH_ENTRY_RECEIVE_DISCARD = 4,
274 HASH_ENTRY_RECEIVE_DISCARD_BIT = 2
275 };
276
277 static int pxa168_init_hw(struct pxa168_eth_private *pep);
278 static int pxa168_init_phy(struct net_device *dev);
279 static void eth_port_reset(struct net_device *dev);
280 static void eth_port_start(struct net_device *dev);
281 static int pxa168_eth_open(struct net_device *dev);
282 static int pxa168_eth_stop(struct net_device *dev);
283
rdl(struct pxa168_eth_private * pep,int offset)284 static inline u32 rdl(struct pxa168_eth_private *pep, int offset)
285 {
286 return readl_relaxed(pep->base + offset);
287 }
288
wrl(struct pxa168_eth_private * pep,int offset,u32 data)289 static inline void wrl(struct pxa168_eth_private *pep, int offset, u32 data)
290 {
291 writel_relaxed(data, pep->base + offset);
292 }
293
abort_dma(struct pxa168_eth_private * pep)294 static void abort_dma(struct pxa168_eth_private *pep)
295 {
296 int delay;
297 int max_retries = 40;
298
299 do {
300 wrl(pep, SDMA_CMD, SDMA_CMD_AR | SDMA_CMD_AT);
301 udelay(100);
302
303 delay = 10;
304 while ((rdl(pep, SDMA_CMD) & (SDMA_CMD_AR | SDMA_CMD_AT))
305 && delay-- > 0) {
306 udelay(10);
307 }
308 } while (max_retries-- > 0 && delay <= 0);
309
310 if (max_retries <= 0)
311 netdev_err(pep->dev, "%s : DMA Stuck\n", __func__);
312 }
313
rxq_refill(struct net_device * dev)314 static void rxq_refill(struct net_device *dev)
315 {
316 struct pxa168_eth_private *pep = netdev_priv(dev);
317 struct sk_buff *skb;
318 struct rx_desc *p_used_rx_desc;
319 int used_rx_desc;
320
321 while (pep->rx_desc_count < pep->rx_ring_size) {
322 int size;
323
324 skb = netdev_alloc_skb(dev, pep->skb_size);
325 if (!skb)
326 break;
327 if (SKB_DMA_REALIGN)
328 skb_reserve(skb, SKB_DMA_REALIGN);
329 pep->rx_desc_count++;
330 /* Get 'used' Rx descriptor */
331 used_rx_desc = pep->rx_used_desc_q;
332 p_used_rx_desc = &pep->p_rx_desc_area[used_rx_desc];
333 size = skb_end_pointer(skb) - skb->data;
334 p_used_rx_desc->buf_ptr = dma_map_single(NULL,
335 skb->data,
336 size,
337 DMA_FROM_DEVICE);
338 p_used_rx_desc->buf_size = size;
339 pep->rx_skb[used_rx_desc] = skb;
340
341 /* Return the descriptor to DMA ownership */
342 dma_wmb();
343 p_used_rx_desc->cmd_sts = BUF_OWNED_BY_DMA | RX_EN_INT;
344 dma_wmb();
345
346 /* Move the used descriptor pointer to the next descriptor */
347 pep->rx_used_desc_q = (used_rx_desc + 1) % pep->rx_ring_size;
348
349 /* Any Rx return cancels the Rx resource error status */
350 pep->rx_resource_err = 0;
351
352 skb_reserve(skb, ETH_HW_IP_ALIGN);
353 }
354
355 /*
356 * If RX ring is empty of SKB, set a timer to try allocating
357 * again at a later time.
358 */
359 if (pep->rx_desc_count == 0) {
360 pep->timeout.expires = jiffies + (HZ / 10);
361 add_timer(&pep->timeout);
362 }
363 }
364
rxq_refill_timer_wrapper(struct timer_list * t)365 static inline void rxq_refill_timer_wrapper(struct timer_list *t)
366 {
367 struct pxa168_eth_private *pep = from_timer(pep, t, timeout);
368 napi_schedule(&pep->napi);
369 }
370
flip_8_bits(u8 x)371 static inline u8 flip_8_bits(u8 x)
372 {
373 return (((x) & 0x01) << 3) | (((x) & 0x02) << 1)
374 | (((x) & 0x04) >> 1) | (((x) & 0x08) >> 3)
375 | (((x) & 0x10) << 3) | (((x) & 0x20) << 1)
376 | (((x) & 0x40) >> 1) | (((x) & 0x80) >> 3);
377 }
378
nibble_swap_every_byte(unsigned char * mac_addr)379 static void nibble_swap_every_byte(unsigned char *mac_addr)
380 {
381 int i;
382 for (i = 0; i < ETH_ALEN; i++) {
383 mac_addr[i] = ((mac_addr[i] & 0x0f) << 4) |
384 ((mac_addr[i] & 0xf0) >> 4);
385 }
386 }
387
inverse_every_nibble(unsigned char * mac_addr)388 static void inverse_every_nibble(unsigned char *mac_addr)
389 {
390 int i;
391 for (i = 0; i < ETH_ALEN; i++)
392 mac_addr[i] = flip_8_bits(mac_addr[i]);
393 }
394
395 /*
396 * ----------------------------------------------------------------------------
397 * This function will calculate the hash function of the address.
398 * Inputs
399 * mac_addr_orig - MAC address.
400 * Outputs
401 * return the calculated entry.
402 */
hash_function(unsigned char * mac_addr_orig)403 static u32 hash_function(unsigned char *mac_addr_orig)
404 {
405 u32 hash_result;
406 u32 addr0;
407 u32 addr1;
408 u32 addr2;
409 u32 addr3;
410 unsigned char mac_addr[ETH_ALEN];
411
412 /* Make a copy of MAC address since we are going to performe bit
413 * operations on it
414 */
415 memcpy(mac_addr, mac_addr_orig, ETH_ALEN);
416
417 nibble_swap_every_byte(mac_addr);
418 inverse_every_nibble(mac_addr);
419
420 addr0 = (mac_addr[5] >> 2) & 0x3f;
421 addr1 = (mac_addr[5] & 0x03) | (((mac_addr[4] & 0x7f)) << 2);
422 addr2 = ((mac_addr[4] & 0x80) >> 7) | mac_addr[3] << 1;
423 addr3 = (mac_addr[2] & 0xff) | ((mac_addr[1] & 1) << 8);
424
425 hash_result = (addr0 << 9) | (addr1 ^ addr2 ^ addr3);
426 hash_result = hash_result & 0x07ff;
427 return hash_result;
428 }
429
430 /*
431 * ----------------------------------------------------------------------------
432 * This function will add/del an entry to the address table.
433 * Inputs
434 * pep - ETHERNET .
435 * mac_addr - MAC address.
436 * skip - if 1, skip this address.Used in case of deleting an entry which is a
437 * part of chain in the hash table.We can't just delete the entry since
438 * that will break the chain.We need to defragment the tables time to
439 * time.
440 * rd - 0 Discard packet upon match.
441 * - 1 Receive packet upon match.
442 * Outputs
443 * address table entry is added/deleted.
444 * 0 if success.
445 * -ENOSPC if table full
446 */
add_del_hash_entry(struct pxa168_eth_private * pep,unsigned char * mac_addr,u32 rd,u32 skip,int del)447 static int add_del_hash_entry(struct pxa168_eth_private *pep,
448 unsigned char *mac_addr,
449 u32 rd, u32 skip, int del)
450 {
451 struct addr_table_entry *entry, *start;
452 u32 new_high;
453 u32 new_low;
454 u32 i;
455
456 new_low = (((mac_addr[1] >> 4) & 0xf) << 15)
457 | (((mac_addr[1] >> 0) & 0xf) << 11)
458 | (((mac_addr[0] >> 4) & 0xf) << 7)
459 | (((mac_addr[0] >> 0) & 0xf) << 3)
460 | (((mac_addr[3] >> 4) & 0x1) << 31)
461 | (((mac_addr[3] >> 0) & 0xf) << 27)
462 | (((mac_addr[2] >> 4) & 0xf) << 23)
463 | (((mac_addr[2] >> 0) & 0xf) << 19)
464 | (skip << SKIP) | (rd << HASH_ENTRY_RECEIVE_DISCARD_BIT)
465 | HASH_ENTRY_VALID;
466
467 new_high = (((mac_addr[5] >> 4) & 0xf) << 15)
468 | (((mac_addr[5] >> 0) & 0xf) << 11)
469 | (((mac_addr[4] >> 4) & 0xf) << 7)
470 | (((mac_addr[4] >> 0) & 0xf) << 3)
471 | (((mac_addr[3] >> 5) & 0x7) << 0);
472
473 /*
474 * Pick the appropriate table, start scanning for free/reusable
475 * entries at the index obtained by hashing the specified MAC address
476 */
477 start = pep->htpr;
478 entry = start + hash_function(mac_addr);
479 for (i = 0; i < HOP_NUMBER; i++) {
480 if (!(le32_to_cpu(entry->lo) & HASH_ENTRY_VALID)) {
481 break;
482 } else {
483 /* if same address put in same position */
484 if (((le32_to_cpu(entry->lo) & 0xfffffff8) ==
485 (new_low & 0xfffffff8)) &&
486 (le32_to_cpu(entry->hi) == new_high)) {
487 break;
488 }
489 }
490 if (entry == start + 0x7ff)
491 entry = start;
492 else
493 entry++;
494 }
495
496 if (((le32_to_cpu(entry->lo) & 0xfffffff8) != (new_low & 0xfffffff8)) &&
497 (le32_to_cpu(entry->hi) != new_high) && del)
498 return 0;
499
500 if (i == HOP_NUMBER) {
501 if (!del) {
502 netdev_info(pep->dev,
503 "%s: table section is full, need to "
504 "move to 16kB implementation?\n",
505 __FILE__);
506 return -ENOSPC;
507 } else
508 return 0;
509 }
510
511 /*
512 * Update the selected entry
513 */
514 if (del) {
515 entry->hi = 0;
516 entry->lo = 0;
517 } else {
518 entry->hi = cpu_to_le32(new_high);
519 entry->lo = cpu_to_le32(new_low);
520 }
521
522 return 0;
523 }
524
525 /*
526 * ----------------------------------------------------------------------------
527 * Create an addressTable entry from MAC address info
528 * found in the specifed net_device struct
529 *
530 * Input : pointer to ethernet interface network device structure
531 * Output : N/A
532 */
update_hash_table_mac_address(struct pxa168_eth_private * pep,unsigned char * oaddr,unsigned char * addr)533 static void update_hash_table_mac_address(struct pxa168_eth_private *pep,
534 unsigned char *oaddr,
535 unsigned char *addr)
536 {
537 /* Delete old entry */
538 if (oaddr)
539 add_del_hash_entry(pep, oaddr, 1, 0, HASH_DELETE);
540 /* Add new entry */
541 add_del_hash_entry(pep, addr, 1, 0, HASH_ADD);
542 }
543
init_hash_table(struct pxa168_eth_private * pep)544 static int init_hash_table(struct pxa168_eth_private *pep)
545 {
546 /*
547 * Hardware expects CPU to build a hash table based on a predefined
548 * hash function and populate it based on hardware address. The
549 * location of the hash table is identified by 32-bit pointer stored
550 * in HTPR internal register. Two possible sizes exists for the hash
551 * table 8kB (256kB of DRAM required (4 x 64 kB banks)) and 1/2kB
552 * (16kB of DRAM required (4 x 4 kB banks)).We currently only support
553 * 1/2kB.
554 */
555 /* TODO: Add support for 8kB hash table and alternative hash
556 * function.Driver can dynamically switch to them if the 1/2kB hash
557 * table is full.
558 */
559 if (!pep->htpr) {
560 pep->htpr = dma_zalloc_coherent(pep->dev->dev.parent,
561 HASH_ADDR_TABLE_SIZE,
562 &pep->htpr_dma, GFP_KERNEL);
563 if (!pep->htpr)
564 return -ENOMEM;
565 } else {
566 memset(pep->htpr, 0, HASH_ADDR_TABLE_SIZE);
567 }
568 wrl(pep, HTPR, pep->htpr_dma);
569 return 0;
570 }
571
pxa168_eth_set_rx_mode(struct net_device * dev)572 static void pxa168_eth_set_rx_mode(struct net_device *dev)
573 {
574 struct pxa168_eth_private *pep = netdev_priv(dev);
575 struct netdev_hw_addr *ha;
576 u32 val;
577
578 val = rdl(pep, PORT_CONFIG);
579 if (dev->flags & IFF_PROMISC)
580 val |= PCR_PM;
581 else
582 val &= ~PCR_PM;
583 wrl(pep, PORT_CONFIG, val);
584
585 /*
586 * Remove the old list of MAC address and add dev->addr
587 * and multicast address.
588 */
589 memset(pep->htpr, 0, HASH_ADDR_TABLE_SIZE);
590 update_hash_table_mac_address(pep, NULL, dev->dev_addr);
591
592 netdev_for_each_mc_addr(ha, dev)
593 update_hash_table_mac_address(pep, NULL, ha->addr);
594 }
595
pxa168_eth_get_mac_address(struct net_device * dev,unsigned char * addr)596 static void pxa168_eth_get_mac_address(struct net_device *dev,
597 unsigned char *addr)
598 {
599 struct pxa168_eth_private *pep = netdev_priv(dev);
600 unsigned int mac_h = rdl(pep, MAC_ADDR_HIGH);
601 unsigned int mac_l = rdl(pep, MAC_ADDR_LOW);
602
603 addr[0] = (mac_h >> 24) & 0xff;
604 addr[1] = (mac_h >> 16) & 0xff;
605 addr[2] = (mac_h >> 8) & 0xff;
606 addr[3] = mac_h & 0xff;
607 addr[4] = (mac_l >> 8) & 0xff;
608 addr[5] = mac_l & 0xff;
609 }
610
pxa168_eth_set_mac_address(struct net_device * dev,void * addr)611 static int pxa168_eth_set_mac_address(struct net_device *dev, void *addr)
612 {
613 struct sockaddr *sa = addr;
614 struct pxa168_eth_private *pep = netdev_priv(dev);
615 unsigned char oldMac[ETH_ALEN];
616 u32 mac_h, mac_l;
617
618 if (!is_valid_ether_addr(sa->sa_data))
619 return -EADDRNOTAVAIL;
620 memcpy(oldMac, dev->dev_addr, ETH_ALEN);
621 memcpy(dev->dev_addr, sa->sa_data, ETH_ALEN);
622
623 mac_h = dev->dev_addr[0] << 24;
624 mac_h |= dev->dev_addr[1] << 16;
625 mac_h |= dev->dev_addr[2] << 8;
626 mac_h |= dev->dev_addr[3];
627 mac_l = dev->dev_addr[4] << 8;
628 mac_l |= dev->dev_addr[5];
629 wrl(pep, MAC_ADDR_HIGH, mac_h);
630 wrl(pep, MAC_ADDR_LOW, mac_l);
631
632 netif_addr_lock_bh(dev);
633 update_hash_table_mac_address(pep, oldMac, dev->dev_addr);
634 netif_addr_unlock_bh(dev);
635 return 0;
636 }
637
eth_port_start(struct net_device * dev)638 static void eth_port_start(struct net_device *dev)
639 {
640 unsigned int val = 0;
641 struct pxa168_eth_private *pep = netdev_priv(dev);
642 int tx_curr_desc, rx_curr_desc;
643
644 phy_start(dev->phydev);
645
646 /* Assignment of Tx CTRP of given queue */
647 tx_curr_desc = pep->tx_curr_desc_q;
648 wrl(pep, ETH_C_TX_DESC_1,
649 (u32) (pep->tx_desc_dma + tx_curr_desc * sizeof(struct tx_desc)));
650
651 /* Assignment of Rx CRDP of given queue */
652 rx_curr_desc = pep->rx_curr_desc_q;
653 wrl(pep, ETH_C_RX_DESC_0,
654 (u32) (pep->rx_desc_dma + rx_curr_desc * sizeof(struct rx_desc)));
655
656 wrl(pep, ETH_F_RX_DESC_0,
657 (u32) (pep->rx_desc_dma + rx_curr_desc * sizeof(struct rx_desc)));
658
659 /* Clear all interrupts */
660 wrl(pep, INT_CAUSE, 0);
661
662 /* Enable all interrupts for receive, transmit and error. */
663 wrl(pep, INT_MASK, ALL_INTS);
664
665 val = rdl(pep, PORT_CONFIG);
666 val |= PCR_EN;
667 wrl(pep, PORT_CONFIG, val);
668
669 /* Start RX DMA engine */
670 val = rdl(pep, SDMA_CMD);
671 val |= SDMA_CMD_ERD;
672 wrl(pep, SDMA_CMD, val);
673 }
674
eth_port_reset(struct net_device * dev)675 static void eth_port_reset(struct net_device *dev)
676 {
677 struct pxa168_eth_private *pep = netdev_priv(dev);
678 unsigned int val = 0;
679
680 /* Stop all interrupts for receive, transmit and error. */
681 wrl(pep, INT_MASK, 0);
682
683 /* Clear all interrupts */
684 wrl(pep, INT_CAUSE, 0);
685
686 /* Stop RX DMA */
687 val = rdl(pep, SDMA_CMD);
688 val &= ~SDMA_CMD_ERD; /* abort dma command */
689
690 /* Abort any transmit and receive operations and put DMA
691 * in idle state.
692 */
693 abort_dma(pep);
694
695 /* Disable port */
696 val = rdl(pep, PORT_CONFIG);
697 val &= ~PCR_EN;
698 wrl(pep, PORT_CONFIG, val);
699
700 phy_stop(dev->phydev);
701 }
702
703 /*
704 * txq_reclaim - Free the tx desc data for completed descriptors
705 * If force is non-zero, frees uncompleted descriptors as well
706 */
txq_reclaim(struct net_device * dev,int force)707 static int txq_reclaim(struct net_device *dev, int force)
708 {
709 struct pxa168_eth_private *pep = netdev_priv(dev);
710 struct tx_desc *desc;
711 u32 cmd_sts;
712 struct sk_buff *skb;
713 int tx_index;
714 dma_addr_t addr;
715 int count;
716 int released = 0;
717
718 netif_tx_lock(dev);
719
720 pep->work_todo &= ~WORK_TX_DONE;
721 while (pep->tx_desc_count > 0) {
722 tx_index = pep->tx_used_desc_q;
723 desc = &pep->p_tx_desc_area[tx_index];
724 cmd_sts = desc->cmd_sts;
725 if (!force && (cmd_sts & BUF_OWNED_BY_DMA)) {
726 if (released > 0) {
727 goto txq_reclaim_end;
728 } else {
729 released = -1;
730 goto txq_reclaim_end;
731 }
732 }
733 pep->tx_used_desc_q = (tx_index + 1) % pep->tx_ring_size;
734 pep->tx_desc_count--;
735 addr = desc->buf_ptr;
736 count = desc->byte_cnt;
737 skb = pep->tx_skb[tx_index];
738 if (skb)
739 pep->tx_skb[tx_index] = NULL;
740
741 if (cmd_sts & TX_ERROR) {
742 if (net_ratelimit())
743 netdev_err(dev, "Error in TX\n");
744 dev->stats.tx_errors++;
745 }
746 dma_unmap_single(NULL, addr, count, DMA_TO_DEVICE);
747 if (skb)
748 dev_kfree_skb_irq(skb);
749 released++;
750 }
751 txq_reclaim_end:
752 netif_tx_unlock(dev);
753 return released;
754 }
755
pxa168_eth_tx_timeout(struct net_device * dev)756 static void pxa168_eth_tx_timeout(struct net_device *dev)
757 {
758 struct pxa168_eth_private *pep = netdev_priv(dev);
759
760 netdev_info(dev, "TX timeout desc_count %d\n", pep->tx_desc_count);
761
762 schedule_work(&pep->tx_timeout_task);
763 }
764
pxa168_eth_tx_timeout_task(struct work_struct * work)765 static void pxa168_eth_tx_timeout_task(struct work_struct *work)
766 {
767 struct pxa168_eth_private *pep = container_of(work,
768 struct pxa168_eth_private,
769 tx_timeout_task);
770 struct net_device *dev = pep->dev;
771 pxa168_eth_stop(dev);
772 pxa168_eth_open(dev);
773 }
774
rxq_process(struct net_device * dev,int budget)775 static int rxq_process(struct net_device *dev, int budget)
776 {
777 struct pxa168_eth_private *pep = netdev_priv(dev);
778 struct net_device_stats *stats = &dev->stats;
779 unsigned int received_packets = 0;
780 struct sk_buff *skb;
781
782 while (budget-- > 0) {
783 int rx_next_curr_desc, rx_curr_desc, rx_used_desc;
784 struct rx_desc *rx_desc;
785 unsigned int cmd_sts;
786
787 /* Do not process Rx ring in case of Rx ring resource error */
788 if (pep->rx_resource_err)
789 break;
790 rx_curr_desc = pep->rx_curr_desc_q;
791 rx_used_desc = pep->rx_used_desc_q;
792 rx_desc = &pep->p_rx_desc_area[rx_curr_desc];
793 cmd_sts = rx_desc->cmd_sts;
794 dma_rmb();
795 if (cmd_sts & (BUF_OWNED_BY_DMA))
796 break;
797 skb = pep->rx_skb[rx_curr_desc];
798 pep->rx_skb[rx_curr_desc] = NULL;
799
800 rx_next_curr_desc = (rx_curr_desc + 1) % pep->rx_ring_size;
801 pep->rx_curr_desc_q = rx_next_curr_desc;
802
803 /* Rx descriptors exhausted. */
804 /* Set the Rx ring resource error flag */
805 if (rx_next_curr_desc == rx_used_desc)
806 pep->rx_resource_err = 1;
807 pep->rx_desc_count--;
808 dma_unmap_single(NULL, rx_desc->buf_ptr,
809 rx_desc->buf_size,
810 DMA_FROM_DEVICE);
811 received_packets++;
812 /*
813 * Update statistics.
814 * Note byte count includes 4 byte CRC count
815 */
816 stats->rx_packets++;
817 stats->rx_bytes += rx_desc->byte_cnt;
818 /*
819 * In case received a packet without first / last bits on OR
820 * the error summary bit is on, the packets needs to be droped.
821 */
822 if (((cmd_sts & (RX_FIRST_DESC | RX_LAST_DESC)) !=
823 (RX_FIRST_DESC | RX_LAST_DESC))
824 || (cmd_sts & RX_ERROR)) {
825
826 stats->rx_dropped++;
827 if ((cmd_sts & (RX_FIRST_DESC | RX_LAST_DESC)) !=
828 (RX_FIRST_DESC | RX_LAST_DESC)) {
829 if (net_ratelimit())
830 netdev_err(dev,
831 "Rx pkt on multiple desc\n");
832 }
833 if (cmd_sts & RX_ERROR)
834 stats->rx_errors++;
835 dev_kfree_skb_irq(skb);
836 } else {
837 /*
838 * The -4 is for the CRC in the trailer of the
839 * received packet
840 */
841 skb_put(skb, rx_desc->byte_cnt - 4);
842 skb->protocol = eth_type_trans(skb, dev);
843 netif_receive_skb(skb);
844 }
845 }
846 /* Fill RX ring with skb's */
847 rxq_refill(dev);
848 return received_packets;
849 }
850
pxa168_eth_collect_events(struct pxa168_eth_private * pep,struct net_device * dev)851 static int pxa168_eth_collect_events(struct pxa168_eth_private *pep,
852 struct net_device *dev)
853 {
854 u32 icr;
855 int ret = 0;
856
857 icr = rdl(pep, INT_CAUSE);
858 if (icr == 0)
859 return IRQ_NONE;
860
861 wrl(pep, INT_CAUSE, ~icr);
862 if (icr & (ICR_TXBUF_H | ICR_TXBUF_L)) {
863 pep->work_todo |= WORK_TX_DONE;
864 ret = 1;
865 }
866 if (icr & ICR_RXBUF)
867 ret = 1;
868 return ret;
869 }
870
pxa168_eth_int_handler(int irq,void * dev_id)871 static irqreturn_t pxa168_eth_int_handler(int irq, void *dev_id)
872 {
873 struct net_device *dev = (struct net_device *)dev_id;
874 struct pxa168_eth_private *pep = netdev_priv(dev);
875
876 if (unlikely(!pxa168_eth_collect_events(pep, dev)))
877 return IRQ_NONE;
878 /* Disable interrupts */
879 wrl(pep, INT_MASK, 0);
880 napi_schedule(&pep->napi);
881 return IRQ_HANDLED;
882 }
883
pxa168_eth_recalc_skb_size(struct pxa168_eth_private * pep)884 static void pxa168_eth_recalc_skb_size(struct pxa168_eth_private *pep)
885 {
886 int skb_size;
887
888 /*
889 * Reserve 2+14 bytes for an ethernet header (the hardware
890 * automatically prepends 2 bytes of dummy data to each
891 * received packet), 16 bytes for up to four VLAN tags, and
892 * 4 bytes for the trailing FCS -- 36 bytes total.
893 */
894 skb_size = pep->dev->mtu + 36;
895
896 /*
897 * Make sure that the skb size is a multiple of 8 bytes, as
898 * the lower three bits of the receive descriptor's buffer
899 * size field are ignored by the hardware.
900 */
901 pep->skb_size = (skb_size + 7) & ~7;
902
903 /*
904 * If NET_SKB_PAD is smaller than a cache line,
905 * netdev_alloc_skb() will cause skb->data to be misaligned
906 * to a cache line boundary. If this is the case, include
907 * some extra space to allow re-aligning the data area.
908 */
909 pep->skb_size += SKB_DMA_REALIGN;
910
911 }
912
set_port_config_ext(struct pxa168_eth_private * pep)913 static int set_port_config_ext(struct pxa168_eth_private *pep)
914 {
915 int skb_size;
916
917 pxa168_eth_recalc_skb_size(pep);
918 if (pep->skb_size <= 1518)
919 skb_size = PCXR_MFL_1518;
920 else if (pep->skb_size <= 1536)
921 skb_size = PCXR_MFL_1536;
922 else if (pep->skb_size <= 2048)
923 skb_size = PCXR_MFL_2048;
924 else
925 skb_size = PCXR_MFL_64K;
926
927 /* Extended Port Configuration */
928 wrl(pep, PORT_CONFIG_EXT,
929 PCXR_AN_SPEED_DIS | /* Disable HW AN */
930 PCXR_AN_DUPLEX_DIS |
931 PCXR_AN_FLOWCTL_DIS |
932 PCXR_2BSM | /* Two byte prefix aligns IP hdr */
933 PCXR_DSCP_EN | /* Enable DSCP in IP */
934 skb_size | PCXR_FLP | /* do not force link pass */
935 PCXR_TX_HIGH_PRI); /* Transmit - high priority queue */
936
937 return 0;
938 }
939
pxa168_eth_adjust_link(struct net_device * dev)940 static void pxa168_eth_adjust_link(struct net_device *dev)
941 {
942 struct pxa168_eth_private *pep = netdev_priv(dev);
943 struct phy_device *phy = dev->phydev;
944 u32 cfg, cfg_o = rdl(pep, PORT_CONFIG);
945 u32 cfgext, cfgext_o = rdl(pep, PORT_CONFIG_EXT);
946
947 cfg = cfg_o & ~PCR_DUPLEX_FULL;
948 cfgext = cfgext_o & ~(PCXR_SPEED_100 | PCXR_FLOWCTL_DIS | PCXR_RMII_EN);
949
950 if (phy->interface == PHY_INTERFACE_MODE_RMII)
951 cfgext |= PCXR_RMII_EN;
952 if (phy->speed == SPEED_100)
953 cfgext |= PCXR_SPEED_100;
954 if (phy->duplex)
955 cfg |= PCR_DUPLEX_FULL;
956 if (!phy->pause)
957 cfgext |= PCXR_FLOWCTL_DIS;
958
959 /* Bail out if there has nothing changed */
960 if (cfg == cfg_o && cfgext == cfgext_o)
961 return;
962
963 wrl(pep, PORT_CONFIG, cfg);
964 wrl(pep, PORT_CONFIG_EXT, cfgext);
965
966 phy_print_status(phy);
967 }
968
pxa168_init_phy(struct net_device * dev)969 static int pxa168_init_phy(struct net_device *dev)
970 {
971 struct pxa168_eth_private *pep = netdev_priv(dev);
972 struct ethtool_link_ksettings cmd;
973 struct phy_device *phy = NULL;
974 int err;
975
976 if (dev->phydev)
977 return 0;
978
979 phy = mdiobus_scan(pep->smi_bus, pep->phy_addr);
980 if (IS_ERR(phy))
981 return PTR_ERR(phy);
982
983 err = phy_connect_direct(dev, phy, pxa168_eth_adjust_link,
984 pep->phy_intf);
985 if (err)
986 return err;
987
988 cmd.base.phy_address = pep->phy_addr;
989 cmd.base.speed = pep->phy_speed;
990 cmd.base.duplex = pep->phy_duplex;
991 ethtool_convert_legacy_u32_to_link_mode(cmd.link_modes.advertising,
992 PHY_BASIC_FEATURES);
993 cmd.base.autoneg = AUTONEG_ENABLE;
994
995 if (cmd.base.speed != 0)
996 cmd.base.autoneg = AUTONEG_DISABLE;
997
998 return phy_ethtool_set_link_ksettings(dev, &cmd);
999 }
1000
pxa168_init_hw(struct pxa168_eth_private * pep)1001 static int pxa168_init_hw(struct pxa168_eth_private *pep)
1002 {
1003 int err = 0;
1004
1005 /* Disable interrupts */
1006 wrl(pep, INT_MASK, 0);
1007 wrl(pep, INT_CAUSE, 0);
1008 /* Write to ICR to clear interrupts. */
1009 wrl(pep, INT_W_CLEAR, 0);
1010 /* Abort any transmit and receive operations and put DMA
1011 * in idle state.
1012 */
1013 abort_dma(pep);
1014 /* Initialize address hash table */
1015 err = init_hash_table(pep);
1016 if (err)
1017 return err;
1018 /* SDMA configuration */
1019 wrl(pep, SDMA_CONFIG, SDCR_BSZ8 | /* Burst size = 32 bytes */
1020 SDCR_RIFB | /* Rx interrupt on frame */
1021 SDCR_BLMT | /* Little endian transmit */
1022 SDCR_BLMR | /* Little endian receive */
1023 SDCR_RC_MAX_RETRANS); /* Max retransmit count */
1024 /* Port Configuration */
1025 wrl(pep, PORT_CONFIG, PCR_HS); /* Hash size is 1/2kb */
1026 set_port_config_ext(pep);
1027
1028 return err;
1029 }
1030
rxq_init(struct net_device * dev)1031 static int rxq_init(struct net_device *dev)
1032 {
1033 struct pxa168_eth_private *pep = netdev_priv(dev);
1034 struct rx_desc *p_rx_desc;
1035 int size = 0, i = 0;
1036 int rx_desc_num = pep->rx_ring_size;
1037
1038 /* Allocate RX skb rings */
1039 pep->rx_skb = kcalloc(rx_desc_num, sizeof(*pep->rx_skb), GFP_KERNEL);
1040 if (!pep->rx_skb)
1041 return -ENOMEM;
1042
1043 /* Allocate RX ring */
1044 pep->rx_desc_count = 0;
1045 size = pep->rx_ring_size * sizeof(struct rx_desc);
1046 pep->rx_desc_area_size = size;
1047 pep->p_rx_desc_area = dma_zalloc_coherent(pep->dev->dev.parent, size,
1048 &pep->rx_desc_dma,
1049 GFP_KERNEL);
1050 if (!pep->p_rx_desc_area)
1051 goto out;
1052
1053 /* initialize the next_desc_ptr links in the Rx descriptors ring */
1054 p_rx_desc = pep->p_rx_desc_area;
1055 for (i = 0; i < rx_desc_num; i++) {
1056 p_rx_desc[i].next_desc_ptr = pep->rx_desc_dma +
1057 ((i + 1) % rx_desc_num) * sizeof(struct rx_desc);
1058 }
1059 /* Save Rx desc pointer to driver struct. */
1060 pep->rx_curr_desc_q = 0;
1061 pep->rx_used_desc_q = 0;
1062 pep->rx_desc_area_size = rx_desc_num * sizeof(struct rx_desc);
1063 return 0;
1064 out:
1065 kfree(pep->rx_skb);
1066 return -ENOMEM;
1067 }
1068
rxq_deinit(struct net_device * dev)1069 static void rxq_deinit(struct net_device *dev)
1070 {
1071 struct pxa168_eth_private *pep = netdev_priv(dev);
1072 int curr;
1073
1074 /* Free preallocated skb's on RX rings */
1075 for (curr = 0; pep->rx_desc_count && curr < pep->rx_ring_size; curr++) {
1076 if (pep->rx_skb[curr]) {
1077 dev_kfree_skb(pep->rx_skb[curr]);
1078 pep->rx_desc_count--;
1079 }
1080 }
1081 if (pep->rx_desc_count)
1082 netdev_err(dev, "Error in freeing Rx Ring. %d skb's still\n",
1083 pep->rx_desc_count);
1084 /* Free RX ring */
1085 if (pep->p_rx_desc_area)
1086 dma_free_coherent(pep->dev->dev.parent, pep->rx_desc_area_size,
1087 pep->p_rx_desc_area, pep->rx_desc_dma);
1088 kfree(pep->rx_skb);
1089 }
1090
txq_init(struct net_device * dev)1091 static int txq_init(struct net_device *dev)
1092 {
1093 struct pxa168_eth_private *pep = netdev_priv(dev);
1094 struct tx_desc *p_tx_desc;
1095 int size = 0, i = 0;
1096 int tx_desc_num = pep->tx_ring_size;
1097
1098 pep->tx_skb = kcalloc(tx_desc_num, sizeof(*pep->tx_skb), GFP_KERNEL);
1099 if (!pep->tx_skb)
1100 return -ENOMEM;
1101
1102 /* Allocate TX ring */
1103 pep->tx_desc_count = 0;
1104 size = pep->tx_ring_size * sizeof(struct tx_desc);
1105 pep->tx_desc_area_size = size;
1106 pep->p_tx_desc_area = dma_zalloc_coherent(pep->dev->dev.parent, size,
1107 &pep->tx_desc_dma,
1108 GFP_KERNEL);
1109 if (!pep->p_tx_desc_area)
1110 goto out;
1111 /* Initialize the next_desc_ptr links in the Tx descriptors ring */
1112 p_tx_desc = pep->p_tx_desc_area;
1113 for (i = 0; i < tx_desc_num; i++) {
1114 p_tx_desc[i].next_desc_ptr = pep->tx_desc_dma +
1115 ((i + 1) % tx_desc_num) * sizeof(struct tx_desc);
1116 }
1117 pep->tx_curr_desc_q = 0;
1118 pep->tx_used_desc_q = 0;
1119 pep->tx_desc_area_size = tx_desc_num * sizeof(struct tx_desc);
1120 return 0;
1121 out:
1122 kfree(pep->tx_skb);
1123 return -ENOMEM;
1124 }
1125
txq_deinit(struct net_device * dev)1126 static void txq_deinit(struct net_device *dev)
1127 {
1128 struct pxa168_eth_private *pep = netdev_priv(dev);
1129
1130 /* Free outstanding skb's on TX ring */
1131 txq_reclaim(dev, 1);
1132 BUG_ON(pep->tx_used_desc_q != pep->tx_curr_desc_q);
1133 /* Free TX ring */
1134 if (pep->p_tx_desc_area)
1135 dma_free_coherent(pep->dev->dev.parent, pep->tx_desc_area_size,
1136 pep->p_tx_desc_area, pep->tx_desc_dma);
1137 kfree(pep->tx_skb);
1138 }
1139
pxa168_eth_open(struct net_device * dev)1140 static int pxa168_eth_open(struct net_device *dev)
1141 {
1142 struct pxa168_eth_private *pep = netdev_priv(dev);
1143 int err;
1144
1145 err = pxa168_init_phy(dev);
1146 if (err)
1147 return err;
1148
1149 err = request_irq(dev->irq, pxa168_eth_int_handler, 0, dev->name, dev);
1150 if (err) {
1151 dev_err(&dev->dev, "can't assign irq\n");
1152 return -EAGAIN;
1153 }
1154 pep->rx_resource_err = 0;
1155 err = rxq_init(dev);
1156 if (err != 0)
1157 goto out_free_irq;
1158 err = txq_init(dev);
1159 if (err != 0)
1160 goto out_free_rx_skb;
1161 pep->rx_used_desc_q = 0;
1162 pep->rx_curr_desc_q = 0;
1163
1164 /* Fill RX ring with skb's */
1165 rxq_refill(dev);
1166 pep->rx_used_desc_q = 0;
1167 pep->rx_curr_desc_q = 0;
1168 netif_carrier_off(dev);
1169 napi_enable(&pep->napi);
1170 eth_port_start(dev);
1171 return 0;
1172 out_free_rx_skb:
1173 rxq_deinit(dev);
1174 out_free_irq:
1175 free_irq(dev->irq, dev);
1176 return err;
1177 }
1178
pxa168_eth_stop(struct net_device * dev)1179 static int pxa168_eth_stop(struct net_device *dev)
1180 {
1181 struct pxa168_eth_private *pep = netdev_priv(dev);
1182 eth_port_reset(dev);
1183
1184 /* Disable interrupts */
1185 wrl(pep, INT_MASK, 0);
1186 wrl(pep, INT_CAUSE, 0);
1187 /* Write to ICR to clear interrupts. */
1188 wrl(pep, INT_W_CLEAR, 0);
1189 napi_disable(&pep->napi);
1190 del_timer_sync(&pep->timeout);
1191 netif_carrier_off(dev);
1192 free_irq(dev->irq, dev);
1193 rxq_deinit(dev);
1194 txq_deinit(dev);
1195
1196 return 0;
1197 }
1198
pxa168_eth_change_mtu(struct net_device * dev,int mtu)1199 static int pxa168_eth_change_mtu(struct net_device *dev, int mtu)
1200 {
1201 int retval;
1202 struct pxa168_eth_private *pep = netdev_priv(dev);
1203
1204 dev->mtu = mtu;
1205 retval = set_port_config_ext(pep);
1206
1207 if (!netif_running(dev))
1208 return 0;
1209
1210 /*
1211 * Stop and then re-open the interface. This will allocate RX
1212 * skbs of the new MTU.
1213 * There is a possible danger that the open will not succeed,
1214 * due to memory being full.
1215 */
1216 pxa168_eth_stop(dev);
1217 if (pxa168_eth_open(dev)) {
1218 dev_err(&dev->dev,
1219 "fatal error on re-opening device after MTU change\n");
1220 }
1221
1222 return 0;
1223 }
1224
eth_alloc_tx_desc_index(struct pxa168_eth_private * pep)1225 static int eth_alloc_tx_desc_index(struct pxa168_eth_private *pep)
1226 {
1227 int tx_desc_curr;
1228
1229 tx_desc_curr = pep->tx_curr_desc_q;
1230 pep->tx_curr_desc_q = (tx_desc_curr + 1) % pep->tx_ring_size;
1231 BUG_ON(pep->tx_curr_desc_q == pep->tx_used_desc_q);
1232 pep->tx_desc_count++;
1233
1234 return tx_desc_curr;
1235 }
1236
pxa168_rx_poll(struct napi_struct * napi,int budget)1237 static int pxa168_rx_poll(struct napi_struct *napi, int budget)
1238 {
1239 struct pxa168_eth_private *pep =
1240 container_of(napi, struct pxa168_eth_private, napi);
1241 struct net_device *dev = pep->dev;
1242 int work_done = 0;
1243
1244 /*
1245 * We call txq_reclaim every time since in NAPI interupts are disabled
1246 * and due to this we miss the TX_DONE interrupt,which is not updated in
1247 * interrupt status register.
1248 */
1249 txq_reclaim(dev, 0);
1250 if (netif_queue_stopped(dev)
1251 && pep->tx_ring_size - pep->tx_desc_count > 1) {
1252 netif_wake_queue(dev);
1253 }
1254 work_done = rxq_process(dev, budget);
1255 if (work_done < budget) {
1256 napi_complete_done(napi, work_done);
1257 wrl(pep, INT_MASK, ALL_INTS);
1258 }
1259
1260 return work_done;
1261 }
1262
pxa168_eth_start_xmit(struct sk_buff * skb,struct net_device * dev)1263 static int pxa168_eth_start_xmit(struct sk_buff *skb, struct net_device *dev)
1264 {
1265 struct pxa168_eth_private *pep = netdev_priv(dev);
1266 struct net_device_stats *stats = &dev->stats;
1267 struct tx_desc *desc;
1268 int tx_index;
1269 int length;
1270
1271 tx_index = eth_alloc_tx_desc_index(pep);
1272 desc = &pep->p_tx_desc_area[tx_index];
1273 length = skb->len;
1274 pep->tx_skb[tx_index] = skb;
1275 desc->byte_cnt = length;
1276 desc->buf_ptr = dma_map_single(NULL, skb->data, length, DMA_TO_DEVICE);
1277
1278 skb_tx_timestamp(skb);
1279
1280 dma_wmb();
1281 desc->cmd_sts = BUF_OWNED_BY_DMA | TX_GEN_CRC | TX_FIRST_DESC |
1282 TX_ZERO_PADDING | TX_LAST_DESC | TX_EN_INT;
1283 wmb();
1284 wrl(pep, SDMA_CMD, SDMA_CMD_TXDH | SDMA_CMD_ERD);
1285
1286 stats->tx_bytes += length;
1287 stats->tx_packets++;
1288 netif_trans_update(dev);
1289 if (pep->tx_ring_size - pep->tx_desc_count <= 1) {
1290 /* We handled the current skb, but now we are out of space.*/
1291 netif_stop_queue(dev);
1292 }
1293
1294 return NETDEV_TX_OK;
1295 }
1296
smi_wait_ready(struct pxa168_eth_private * pep)1297 static int smi_wait_ready(struct pxa168_eth_private *pep)
1298 {
1299 int i = 0;
1300
1301 /* wait for the SMI register to become available */
1302 for (i = 0; rdl(pep, SMI) & SMI_BUSY; i++) {
1303 if (i == PHY_WAIT_ITERATIONS)
1304 return -ETIMEDOUT;
1305 msleep(10);
1306 }
1307
1308 return 0;
1309 }
1310
pxa168_smi_read(struct mii_bus * bus,int phy_addr,int regnum)1311 static int pxa168_smi_read(struct mii_bus *bus, int phy_addr, int regnum)
1312 {
1313 struct pxa168_eth_private *pep = bus->priv;
1314 int i = 0;
1315 int val;
1316
1317 if (smi_wait_ready(pep)) {
1318 netdev_warn(pep->dev, "pxa168_eth: SMI bus busy timeout\n");
1319 return -ETIMEDOUT;
1320 }
1321 wrl(pep, SMI, (phy_addr << 16) | (regnum << 21) | SMI_OP_R);
1322 /* now wait for the data to be valid */
1323 for (i = 0; !((val = rdl(pep, SMI)) & SMI_R_VALID); i++) {
1324 if (i == PHY_WAIT_ITERATIONS) {
1325 netdev_warn(pep->dev,
1326 "pxa168_eth: SMI bus read not valid\n");
1327 return -ENODEV;
1328 }
1329 msleep(10);
1330 }
1331
1332 return val & 0xffff;
1333 }
1334
pxa168_smi_write(struct mii_bus * bus,int phy_addr,int regnum,u16 value)1335 static int pxa168_smi_write(struct mii_bus *bus, int phy_addr, int regnum,
1336 u16 value)
1337 {
1338 struct pxa168_eth_private *pep = bus->priv;
1339
1340 if (smi_wait_ready(pep)) {
1341 netdev_warn(pep->dev, "pxa168_eth: SMI bus busy timeout\n");
1342 return -ETIMEDOUT;
1343 }
1344
1345 wrl(pep, SMI, (phy_addr << 16) | (regnum << 21) |
1346 SMI_OP_W | (value & 0xffff));
1347
1348 if (smi_wait_ready(pep)) {
1349 netdev_err(pep->dev, "pxa168_eth: SMI bus busy timeout\n");
1350 return -ETIMEDOUT;
1351 }
1352
1353 return 0;
1354 }
1355
pxa168_eth_do_ioctl(struct net_device * dev,struct ifreq * ifr,int cmd)1356 static int pxa168_eth_do_ioctl(struct net_device *dev, struct ifreq *ifr,
1357 int cmd)
1358 {
1359 if (dev->phydev)
1360 return phy_mii_ioctl(dev->phydev, ifr, cmd);
1361
1362 return -EOPNOTSUPP;
1363 }
1364
1365 #ifdef CONFIG_NET_POLL_CONTROLLER
pxa168_eth_netpoll(struct net_device * dev)1366 static void pxa168_eth_netpoll(struct net_device *dev)
1367 {
1368 disable_irq(dev->irq);
1369 pxa168_eth_int_handler(dev->irq, dev);
1370 enable_irq(dev->irq);
1371 }
1372 #endif
1373
pxa168_get_drvinfo(struct net_device * dev,struct ethtool_drvinfo * info)1374 static void pxa168_get_drvinfo(struct net_device *dev,
1375 struct ethtool_drvinfo *info)
1376 {
1377 strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver));
1378 strlcpy(info->version, DRIVER_VERSION, sizeof(info->version));
1379 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
1380 strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
1381 }
1382
1383 static const struct ethtool_ops pxa168_ethtool_ops = {
1384 .get_drvinfo = pxa168_get_drvinfo,
1385 .nway_reset = phy_ethtool_nway_reset,
1386 .get_link = ethtool_op_get_link,
1387 .get_ts_info = ethtool_op_get_ts_info,
1388 .get_link_ksettings = phy_ethtool_get_link_ksettings,
1389 .set_link_ksettings = phy_ethtool_set_link_ksettings,
1390 };
1391
1392 static const struct net_device_ops pxa168_eth_netdev_ops = {
1393 .ndo_open = pxa168_eth_open,
1394 .ndo_stop = pxa168_eth_stop,
1395 .ndo_start_xmit = pxa168_eth_start_xmit,
1396 .ndo_set_rx_mode = pxa168_eth_set_rx_mode,
1397 .ndo_set_mac_address = pxa168_eth_set_mac_address,
1398 .ndo_validate_addr = eth_validate_addr,
1399 .ndo_do_ioctl = pxa168_eth_do_ioctl,
1400 .ndo_change_mtu = pxa168_eth_change_mtu,
1401 .ndo_tx_timeout = pxa168_eth_tx_timeout,
1402 #ifdef CONFIG_NET_POLL_CONTROLLER
1403 .ndo_poll_controller = pxa168_eth_netpoll,
1404 #endif
1405 };
1406
pxa168_eth_probe(struct platform_device * pdev)1407 static int pxa168_eth_probe(struct platform_device *pdev)
1408 {
1409 struct pxa168_eth_private *pep = NULL;
1410 struct net_device *dev = NULL;
1411 struct resource *res;
1412 struct clk *clk;
1413 struct device_node *np;
1414 const unsigned char *mac_addr = NULL;
1415 int err;
1416
1417 printk(KERN_NOTICE "PXA168 10/100 Ethernet Driver\n");
1418
1419 clk = devm_clk_get(&pdev->dev, NULL);
1420 if (IS_ERR(clk)) {
1421 dev_err(&pdev->dev, "Fast Ethernet failed to get clock\n");
1422 return -ENODEV;
1423 }
1424 clk_prepare_enable(clk);
1425
1426 dev = alloc_etherdev(sizeof(struct pxa168_eth_private));
1427 if (!dev) {
1428 err = -ENOMEM;
1429 goto err_clk;
1430 }
1431
1432 platform_set_drvdata(pdev, dev);
1433 pep = netdev_priv(dev);
1434 pep->dev = dev;
1435 pep->clk = clk;
1436
1437 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1438 pep->base = devm_ioremap_resource(&pdev->dev, res);
1439 if (IS_ERR(pep->base)) {
1440 err = -ENOMEM;
1441 goto err_netdev;
1442 }
1443
1444 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1445 BUG_ON(!res);
1446 dev->irq = res->start;
1447 dev->netdev_ops = &pxa168_eth_netdev_ops;
1448 dev->watchdog_timeo = 2 * HZ;
1449 dev->base_addr = 0;
1450 dev->ethtool_ops = &pxa168_ethtool_ops;
1451
1452 /* MTU range: 68 - 9500 */
1453 dev->min_mtu = ETH_MIN_MTU;
1454 dev->max_mtu = 9500;
1455
1456 INIT_WORK(&pep->tx_timeout_task, pxa168_eth_tx_timeout_task);
1457
1458 if (pdev->dev.of_node)
1459 mac_addr = of_get_mac_address(pdev->dev.of_node);
1460
1461 if (mac_addr && is_valid_ether_addr(mac_addr)) {
1462 ether_addr_copy(dev->dev_addr, mac_addr);
1463 } else {
1464 /* try reading the mac address, if set by the bootloader */
1465 pxa168_eth_get_mac_address(dev, dev->dev_addr);
1466 if (!is_valid_ether_addr(dev->dev_addr)) {
1467 dev_info(&pdev->dev, "Using random mac address\n");
1468 eth_hw_addr_random(dev);
1469 }
1470 }
1471
1472 pep->rx_ring_size = NUM_RX_DESCS;
1473 pep->tx_ring_size = NUM_TX_DESCS;
1474
1475 pep->pd = dev_get_platdata(&pdev->dev);
1476 if (pep->pd) {
1477 if (pep->pd->rx_queue_size)
1478 pep->rx_ring_size = pep->pd->rx_queue_size;
1479
1480 if (pep->pd->tx_queue_size)
1481 pep->tx_ring_size = pep->pd->tx_queue_size;
1482
1483 pep->port_num = pep->pd->port_number;
1484 pep->phy_addr = pep->pd->phy_addr;
1485 pep->phy_speed = pep->pd->speed;
1486 pep->phy_duplex = pep->pd->duplex;
1487 pep->phy_intf = pep->pd->intf;
1488
1489 if (pep->pd->init)
1490 pep->pd->init();
1491 } else if (pdev->dev.of_node) {
1492 of_property_read_u32(pdev->dev.of_node, "port-id",
1493 &pep->port_num);
1494
1495 np = of_parse_phandle(pdev->dev.of_node, "phy-handle", 0);
1496 if (!np) {
1497 dev_err(&pdev->dev, "missing phy-handle\n");
1498 err = -EINVAL;
1499 goto err_netdev;
1500 }
1501 of_property_read_u32(np, "reg", &pep->phy_addr);
1502 pep->phy_intf = of_get_phy_mode(pdev->dev.of_node);
1503 of_node_put(np);
1504 }
1505
1506 /* Hardware supports only 3 ports */
1507 BUG_ON(pep->port_num > 2);
1508 netif_napi_add(dev, &pep->napi, pxa168_rx_poll, pep->rx_ring_size);
1509
1510 memset(&pep->timeout, 0, sizeof(struct timer_list));
1511 timer_setup(&pep->timeout, rxq_refill_timer_wrapper, 0);
1512
1513 pep->smi_bus = mdiobus_alloc();
1514 if (!pep->smi_bus) {
1515 err = -ENOMEM;
1516 goto err_netdev;
1517 }
1518 pep->smi_bus->priv = pep;
1519 pep->smi_bus->name = "pxa168_eth smi";
1520 pep->smi_bus->read = pxa168_smi_read;
1521 pep->smi_bus->write = pxa168_smi_write;
1522 snprintf(pep->smi_bus->id, MII_BUS_ID_SIZE, "%s-%d",
1523 pdev->name, pdev->id);
1524 pep->smi_bus->parent = &pdev->dev;
1525 pep->smi_bus->phy_mask = 0xffffffff;
1526 err = mdiobus_register(pep->smi_bus);
1527 if (err)
1528 goto err_free_mdio;
1529
1530 SET_NETDEV_DEV(dev, &pdev->dev);
1531 pxa168_init_hw(pep);
1532 err = register_netdev(dev);
1533 if (err)
1534 goto err_mdiobus;
1535 return 0;
1536
1537 err_mdiobus:
1538 mdiobus_unregister(pep->smi_bus);
1539 err_free_mdio:
1540 mdiobus_free(pep->smi_bus);
1541 err_netdev:
1542 free_netdev(dev);
1543 err_clk:
1544 clk_disable_unprepare(clk);
1545 return err;
1546 }
1547
pxa168_eth_remove(struct platform_device * pdev)1548 static int pxa168_eth_remove(struct platform_device *pdev)
1549 {
1550 struct net_device *dev = platform_get_drvdata(pdev);
1551 struct pxa168_eth_private *pep = netdev_priv(dev);
1552
1553 if (pep->htpr) {
1554 dma_free_coherent(pep->dev->dev.parent, HASH_ADDR_TABLE_SIZE,
1555 pep->htpr, pep->htpr_dma);
1556 pep->htpr = NULL;
1557 }
1558 if (dev->phydev)
1559 phy_disconnect(dev->phydev);
1560 if (pep->clk) {
1561 clk_disable_unprepare(pep->clk);
1562 }
1563
1564 mdiobus_unregister(pep->smi_bus);
1565 mdiobus_free(pep->smi_bus);
1566 unregister_netdev(dev);
1567 cancel_work_sync(&pep->tx_timeout_task);
1568 free_netdev(dev);
1569 return 0;
1570 }
1571
pxa168_eth_shutdown(struct platform_device * pdev)1572 static void pxa168_eth_shutdown(struct platform_device *pdev)
1573 {
1574 struct net_device *dev = platform_get_drvdata(pdev);
1575 eth_port_reset(dev);
1576 }
1577
1578 #ifdef CONFIG_PM
pxa168_eth_resume(struct platform_device * pdev)1579 static int pxa168_eth_resume(struct platform_device *pdev)
1580 {
1581 return -ENOSYS;
1582 }
1583
pxa168_eth_suspend(struct platform_device * pdev,pm_message_t state)1584 static int pxa168_eth_suspend(struct platform_device *pdev, pm_message_t state)
1585 {
1586 return -ENOSYS;
1587 }
1588
1589 #else
1590 #define pxa168_eth_resume NULL
1591 #define pxa168_eth_suspend NULL
1592 #endif
1593
1594 static const struct of_device_id pxa168_eth_of_match[] = {
1595 { .compatible = "marvell,pxa168-eth" },
1596 { },
1597 };
1598 MODULE_DEVICE_TABLE(of, pxa168_eth_of_match);
1599
1600 static struct platform_driver pxa168_eth_driver = {
1601 .probe = pxa168_eth_probe,
1602 .remove = pxa168_eth_remove,
1603 .shutdown = pxa168_eth_shutdown,
1604 .resume = pxa168_eth_resume,
1605 .suspend = pxa168_eth_suspend,
1606 .driver = {
1607 .name = DRIVER_NAME,
1608 .of_match_table = of_match_ptr(pxa168_eth_of_match),
1609 },
1610 };
1611
1612 module_platform_driver(pxa168_eth_driver);
1613
1614 MODULE_LICENSE("GPL");
1615 MODULE_DESCRIPTION("Ethernet driver for Marvell PXA168");
1616 MODULE_ALIAS("platform:pxa168_eth");
1617
