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Bryan Wue190d6b2007-07-17 14:43:44 +08001/*
Mike Frysinger2fb9d6f2008-01-30 16:52:24 +08002 * Blackfin On-Chip MAC Driver
Bryan Wue190d6b2007-07-17 14:43:44 +08003 *
Mike Frysinger2fb9d6f2008-01-30 16:52:24 +08004 * Copyright 2004-2007 Analog Devices Inc.
Bryan Wue190d6b2007-07-17 14:43:44 +08005 *
Mike Frysinger2fb9d6f2008-01-30 16:52:24 +08006 * Enter bugs at http://blackfin.uclinux.org/
Bryan Wue190d6b2007-07-17 14:43:44 +08007 *
Mike Frysinger2fb9d6f2008-01-30 16:52:24 +08008 * Licensed under the GPL-2 or later.
Bryan Wue190d6b2007-07-17 14:43:44 +08009 */
10
11#include <linux/init.h>
12#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/sched.h>
15#include <linux/slab.h>
16#include <linux/delay.h>
17#include <linux/timer.h>
18#include <linux/errno.h>
19#include <linux/irq.h>
20#include <linux/io.h>
21#include <linux/ioport.h>
22#include <linux/crc32.h>
23#include <linux/device.h>
24#include <linux/spinlock.h>
25#include <linux/ethtool.h>
26#include <linux/mii.h>
Bryan Wu4ae5a3a2007-09-19 23:37:36 +080027#include <linux/phy.h>
Bryan Wue190d6b2007-07-17 14:43:44 +080028#include <linux/netdevice.h>
29#include <linux/etherdevice.h>
30#include <linux/skbuff.h>
Bryan Wue190d6b2007-07-17 14:43:44 +080031#include <linux/platform_device.h>
Bryan Wue190d6b2007-07-17 14:43:44 +080032
33#include <asm/dma.h>
34#include <linux/dma-mapping.h>
35
36#include <asm/blackfin.h>
37#include <asm/cacheflush.h>
38#include <asm/portmux.h>
39
40#include "bfin_mac.h"
41
42#define DRV_NAME "bfin_mac"
43#define DRV_VERSION "1.1"
44#define DRV_AUTHOR "Bryan Wu, Luke Yang"
Michael Hennerich6893ff12008-01-30 16:52:25 +080045#define DRV_DESC "Blackfin BF53[67] BF527 on-chip Ethernet MAC driver"
Bryan Wue190d6b2007-07-17 14:43:44 +080046
47MODULE_AUTHOR(DRV_AUTHOR);
48MODULE_LICENSE("GPL");
49MODULE_DESCRIPTION(DRV_DESC);
50
51#if defined(CONFIG_BFIN_MAC_USE_L1)
52# define bfin_mac_alloc(dma_handle, size) l1_data_sram_zalloc(size)
53# define bfin_mac_free(dma_handle, ptr) l1_data_sram_free(ptr)
54#else
55# define bfin_mac_alloc(dma_handle, size) \
56 dma_alloc_coherent(NULL, size, dma_handle, GFP_KERNEL)
57# define bfin_mac_free(dma_handle, ptr) \
58 dma_free_coherent(NULL, sizeof(*ptr), ptr, dma_handle)
59#endif
60
61#define PKT_BUF_SZ 1580
62
63#define MAX_TIMEOUT_CNT 500
64
65/* pointers to maintain transmit list */
66static struct net_dma_desc_tx *tx_list_head;
67static struct net_dma_desc_tx *tx_list_tail;
68static struct net_dma_desc_rx *rx_list_head;
69static struct net_dma_desc_rx *rx_list_tail;
70static struct net_dma_desc_rx *current_rx_ptr;
71static struct net_dma_desc_tx *current_tx_ptr;
72static struct net_dma_desc_tx *tx_desc;
73static struct net_dma_desc_rx *rx_desc;
74
Bryan Wu4ae5a3a2007-09-19 23:37:36 +080075static void bf537mac_disable(void);
76static void bf537mac_enable(void);
77
Bryan Wue190d6b2007-07-17 14:43:44 +080078static void desc_list_free(void)
79{
80 struct net_dma_desc_rx *r;
81 struct net_dma_desc_tx *t;
82 int i;
83#if !defined(CONFIG_BFIN_MAC_USE_L1)
84 dma_addr_t dma_handle = 0;
85#endif
86
87 if (tx_desc) {
88 t = tx_list_head;
89 for (i = 0; i < CONFIG_BFIN_TX_DESC_NUM; i++) {
90 if (t) {
91 if (t->skb) {
92 dev_kfree_skb(t->skb);
93 t->skb = NULL;
94 }
95 t = t->next;
96 }
97 }
98 bfin_mac_free(dma_handle, tx_desc);
99 }
100
101 if (rx_desc) {
102 r = rx_list_head;
103 for (i = 0; i < CONFIG_BFIN_RX_DESC_NUM; i++) {
104 if (r) {
105 if (r->skb) {
106 dev_kfree_skb(r->skb);
107 r->skb = NULL;
108 }
109 r = r->next;
110 }
111 }
112 bfin_mac_free(dma_handle, rx_desc);
113 }
114}
115
116static int desc_list_init(void)
117{
118 int i;
119 struct sk_buff *new_skb;
120#if !defined(CONFIG_BFIN_MAC_USE_L1)
121 /*
122 * This dma_handle is useless in Blackfin dma_alloc_coherent().
123 * The real dma handler is the return value of dma_alloc_coherent().
124 */
125 dma_addr_t dma_handle;
126#endif
127
128 tx_desc = bfin_mac_alloc(&dma_handle,
129 sizeof(struct net_dma_desc_tx) *
130 CONFIG_BFIN_TX_DESC_NUM);
131 if (tx_desc == NULL)
132 goto init_error;
133
134 rx_desc = bfin_mac_alloc(&dma_handle,
135 sizeof(struct net_dma_desc_rx) *
136 CONFIG_BFIN_RX_DESC_NUM);
137 if (rx_desc == NULL)
138 goto init_error;
139
140 /* init tx_list */
141 tx_list_head = tx_list_tail = tx_desc;
142
143 for (i = 0; i < CONFIG_BFIN_TX_DESC_NUM; i++) {
144 struct net_dma_desc_tx *t = tx_desc + i;
145 struct dma_descriptor *a = &(t->desc_a);
146 struct dma_descriptor *b = &(t->desc_b);
147
148 /*
149 * disable DMA
150 * read from memory WNR = 0
151 * wordsize is 32 bits
152 * 6 half words is desc size
153 * large desc flow
154 */
155 a->config = WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE;
156 a->start_addr = (unsigned long)t->packet;
157 a->x_count = 0;
158 a->next_dma_desc = b;
159
160 /*
161 * enabled DMA
162 * write to memory WNR = 1
163 * wordsize is 32 bits
164 * disable interrupt
165 * 6 half words is desc size
166 * large desc flow
167 */
168 b->config = DMAEN | WNR | WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE;
169 b->start_addr = (unsigned long)(&(t->status));
170 b->x_count = 0;
171
172 t->skb = NULL;
173 tx_list_tail->desc_b.next_dma_desc = a;
174 tx_list_tail->next = t;
175 tx_list_tail = t;
176 }
177 tx_list_tail->next = tx_list_head; /* tx_list is a circle */
178 tx_list_tail->desc_b.next_dma_desc = &(tx_list_head->desc_a);
179 current_tx_ptr = tx_list_head;
180
181 /* init rx_list */
182 rx_list_head = rx_list_tail = rx_desc;
183
184 for (i = 0; i < CONFIG_BFIN_RX_DESC_NUM; i++) {
185 struct net_dma_desc_rx *r = rx_desc + i;
186 struct dma_descriptor *a = &(r->desc_a);
187 struct dma_descriptor *b = &(r->desc_b);
188
189 /* allocate a new skb for next time receive */
190 new_skb = dev_alloc_skb(PKT_BUF_SZ + 2);
191 if (!new_skb) {
192 printk(KERN_NOTICE DRV_NAME
193 ": init: low on mem - packet dropped\n");
194 goto init_error;
195 }
196 skb_reserve(new_skb, 2);
197 r->skb = new_skb;
198
199 /*
200 * enabled DMA
201 * write to memory WNR = 1
202 * wordsize is 32 bits
203 * disable interrupt
204 * 6 half words is desc size
205 * large desc flow
206 */
207 a->config = DMAEN | WNR | WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE;
208 /* since RXDWA is enabled */
209 a->start_addr = (unsigned long)new_skb->data - 2;
210 a->x_count = 0;
211 a->next_dma_desc = b;
212
213 /*
214 * enabled DMA
215 * write to memory WNR = 1
216 * wordsize is 32 bits
217 * enable interrupt
218 * 6 half words is desc size
219 * large desc flow
220 */
221 b->config = DMAEN | WNR | WDSIZE_32 | DI_EN |
222 NDSIZE_6 | DMAFLOW_LARGE;
223 b->start_addr = (unsigned long)(&(r->status));
224 b->x_count = 0;
225
226 rx_list_tail->desc_b.next_dma_desc = a;
227 rx_list_tail->next = r;
228 rx_list_tail = r;
229 }
230 rx_list_tail->next = rx_list_head; /* rx_list is a circle */
231 rx_list_tail->desc_b.next_dma_desc = &(rx_list_head->desc_a);
232 current_rx_ptr = rx_list_head;
233
234 return 0;
235
236init_error:
237 desc_list_free();
238 printk(KERN_ERR DRV_NAME ": kmalloc failed\n");
239 return -ENOMEM;
240}
241
242
243/*---PHY CONTROL AND CONFIGURATION-----------------------------------------*/
244
245/* Set FER regs to MUX in Ethernet pins */
246static int setup_pin_mux(int action)
247{
248#if defined(CONFIG_BFIN_MAC_RMII)
249 u16 pin_req[] = P_RMII0;
250#else
251 u16 pin_req[] = P_MII0;
252#endif
253
254 if (action) {
255 if (peripheral_request_list(pin_req, DRV_NAME)) {
256 printk(KERN_ERR DRV_NAME
257 ": Requesting Peripherals failed\n");
258 return -EFAULT;
259 }
260 } else
261 peripheral_free_list(pin_req);
262
263 return 0;
264}
265
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800266/*
267 * MII operations
268 */
Bryan Wue190d6b2007-07-17 14:43:44 +0800269/* Wait until the previous MDC/MDIO transaction has completed */
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800270static void mdio_poll(void)
Bryan Wue190d6b2007-07-17 14:43:44 +0800271{
272 int timeout_cnt = MAX_TIMEOUT_CNT;
273
274 /* poll the STABUSY bit */
275 while ((bfin_read_EMAC_STAADD()) & STABUSY) {
Bryan Wu6db9e462008-01-30 16:52:21 +0800276 udelay(1);
Bryan Wue190d6b2007-07-17 14:43:44 +0800277 if (timeout_cnt-- < 0) {
278 printk(KERN_ERR DRV_NAME
279 ": wait MDC/MDIO transaction to complete timeout\n");
280 break;
281 }
282 }
283}
284
285/* Read an off-chip register in a PHY through the MDC/MDIO port */
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800286static int mdiobus_read(struct mii_bus *bus, int phy_addr, int regnum)
Bryan Wue190d6b2007-07-17 14:43:44 +0800287{
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800288 mdio_poll();
Bryan Wue190d6b2007-07-17 14:43:44 +0800289
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800290 /* read mode */
291 bfin_write_EMAC_STAADD(SET_PHYAD((u16) phy_addr) |
292 SET_REGAD((u16) regnum) |
293 STABUSY);
294
295 mdio_poll();
296
297 return (int) bfin_read_EMAC_STADAT();
Bryan Wue190d6b2007-07-17 14:43:44 +0800298}
299
300/* Write an off-chip register in a PHY through the MDC/MDIO port */
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800301static int mdiobus_write(struct mii_bus *bus, int phy_addr, int regnum,
302 u16 value)
Bryan Wue190d6b2007-07-17 14:43:44 +0800303{
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800304 mdio_poll();
305
306 bfin_write_EMAC_STADAT((u32) value);
Bryan Wue190d6b2007-07-17 14:43:44 +0800307
308 /* write mode */
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800309 bfin_write_EMAC_STAADD(SET_PHYAD((u16) phy_addr) |
310 SET_REGAD((u16) regnum) |
Bryan Wue190d6b2007-07-17 14:43:44 +0800311 STAOP |
312 STABUSY);
313
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800314 mdio_poll();
315
316 return 0;
Bryan Wue190d6b2007-07-17 14:43:44 +0800317}
318
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800319static int mdiobus_reset(struct mii_bus *bus)
Bryan Wue190d6b2007-07-17 14:43:44 +0800320{
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800321 return 0;
Bryan Wue190d6b2007-07-17 14:43:44 +0800322}
323
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800324static void bf537_adjust_link(struct net_device *dev)
Bryan Wue190d6b2007-07-17 14:43:44 +0800325{
Bryan Wue190d6b2007-07-17 14:43:44 +0800326 struct bf537mac_local *lp = netdev_priv(dev);
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800327 struct phy_device *phydev = lp->phydev;
328 unsigned long flags;
329 int new_state = 0;
Bryan Wue190d6b2007-07-17 14:43:44 +0800330
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800331 spin_lock_irqsave(&lp->lock, flags);
332 if (phydev->link) {
333 /* Now we make sure that we can be in full duplex mode.
334 * If not, we operate in half-duplex mode. */
335 if (phydev->duplex != lp->old_duplex) {
336 u32 opmode = bfin_read_EMAC_OPMODE();
337 new_state = 1;
Bryan Wue190d6b2007-07-17 14:43:44 +0800338
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800339 if (phydev->duplex)
340 opmode |= FDMODE;
341 else
342 opmode &= ~(FDMODE);
Bryan Wue190d6b2007-07-17 14:43:44 +0800343
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800344 bfin_write_EMAC_OPMODE(opmode);
345 lp->old_duplex = phydev->duplex;
346 }
Bryan Wue190d6b2007-07-17 14:43:44 +0800347
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800348 if (phydev->speed != lp->old_speed) {
349#if defined(CONFIG_BFIN_MAC_RMII)
350 u32 opmode = bfin_read_EMAC_OPMODE();
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800351 switch (phydev->speed) {
352 case 10:
353 opmode |= RMII_10;
354 break;
355 case 100:
356 opmode &= ~(RMII_10);
357 break;
358 default:
359 printk(KERN_WARNING
360 "%s: Ack! Speed (%d) is not 10/100!\n",
361 DRV_NAME, phydev->speed);
362 break;
363 }
364 bfin_write_EMAC_OPMODE(opmode);
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800365#endif
Bryan Wue190d6b2007-07-17 14:43:44 +0800366
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800367 new_state = 1;
368 lp->old_speed = phydev->speed;
369 }
Bryan Wue190d6b2007-07-17 14:43:44 +0800370
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800371 if (!lp->old_link) {
372 new_state = 1;
373 lp->old_link = 1;
374 netif_schedule(dev);
375 }
376 } else if (lp->old_link) {
377 new_state = 1;
378 lp->old_link = 0;
379 lp->old_speed = 0;
380 lp->old_duplex = -1;
Bryan Wue190d6b2007-07-17 14:43:44 +0800381 }
382
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800383 if (new_state) {
384 u32 opmode = bfin_read_EMAC_OPMODE();
385 phy_print_status(phydev);
386 pr_debug("EMAC_OPMODE = 0x%08x\n", opmode);
Bryan Wue190d6b2007-07-17 14:43:44 +0800387 }
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800388
389 spin_unlock_irqrestore(&lp->lock, flags);
390}
391
Bryan Wu7cc8f382008-01-30 16:52:22 +0800392/* MDC = 2.5 MHz */
393#define MDC_CLK 2500000
394
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800395static int mii_probe(struct net_device *dev)
396{
397 struct bf537mac_local *lp = netdev_priv(dev);
398 struct phy_device *phydev = NULL;
399 unsigned short sysctl;
400 int i;
Bryan Wu7cc8f382008-01-30 16:52:22 +0800401 u32 sclk, mdc_div;
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800402
403 /* Enable PHY output early */
404 if (!(bfin_read_VR_CTL() & PHYCLKOE))
405 bfin_write_VR_CTL(bfin_read_VR_CTL() | PHYCLKOE);
406
Bryan Wu7cc8f382008-01-30 16:52:22 +0800407 sclk = get_sclk();
408 mdc_div = ((sclk / MDC_CLK) / 2) - 1;
409
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800410 sysctl = bfin_read_EMAC_SYSCTL();
Bryan Wu7cc8f382008-01-30 16:52:22 +0800411 sysctl |= SET_MDCDIV(mdc_div);
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800412 bfin_write_EMAC_SYSCTL(sysctl);
413
414 /* search for connect PHY device */
415 for (i = 0; i < PHY_MAX_ADDR; i++) {
416 struct phy_device *const tmp_phydev = lp->mii_bus.phy_map[i];
417
418 if (!tmp_phydev)
419 continue; /* no PHY here... */
420
421 phydev = tmp_phydev;
422 break; /* found it */
423 }
424
425 /* now we are supposed to have a proper phydev, to attach to... */
426 if (!phydev) {
427 printk(KERN_INFO "%s: Don't found any phy device at all\n",
428 dev->name);
429 return -ENODEV;
430 }
431
432#if defined(CONFIG_BFIN_MAC_RMII)
433 phydev = phy_connect(dev, phydev->dev.bus_id, &bf537_adjust_link, 0,
434 PHY_INTERFACE_MODE_RMII);
435#else
436 phydev = phy_connect(dev, phydev->dev.bus_id, &bf537_adjust_link, 0,
437 PHY_INTERFACE_MODE_MII);
438#endif
439
440 if (IS_ERR(phydev)) {
441 printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
442 return PTR_ERR(phydev);
443 }
444
445 /* mask with MAC supported features */
446 phydev->supported &= (SUPPORTED_10baseT_Half
447 | SUPPORTED_10baseT_Full
448 | SUPPORTED_100baseT_Half
449 | SUPPORTED_100baseT_Full
450 | SUPPORTED_Autoneg
451 | SUPPORTED_Pause | SUPPORTED_Asym_Pause
452 | SUPPORTED_MII
453 | SUPPORTED_TP);
454
455 phydev->advertising = phydev->supported;
456
457 lp->old_link = 0;
458 lp->old_speed = 0;
459 lp->old_duplex = -1;
460 lp->phydev = phydev;
461
462 printk(KERN_INFO "%s: attached PHY driver [%s] "
Bryan Wu7cc8f382008-01-30 16:52:22 +0800463 "(mii_bus:phy_addr=%s, irq=%d, mdc_clk=%dHz(mdc_div=%d)"
464 "@sclk=%dMHz)\n",
465 DRV_NAME, phydev->drv->name, phydev->dev.bus_id, phydev->irq,
466 MDC_CLK, mdc_div, sclk/1000000);
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800467
468 return 0;
Bryan Wue190d6b2007-07-17 14:43:44 +0800469}
470
471/**************************************************************************/
472void setup_system_regs(struct net_device *dev)
473{
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800474 unsigned short sysctl;
Bryan Wue190d6b2007-07-17 14:43:44 +0800475
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800476 /*
477 * Odd word alignment for Receive Frame DMA word
478 * Configure checksum support and rcve frame word alignment
479 */
480 sysctl = bfin_read_EMAC_SYSCTL();
Bryan Wue190d6b2007-07-17 14:43:44 +0800481#if defined(BFIN_MAC_CSUM_OFFLOAD)
482 sysctl |= RXDWA | RXCKS;
483#else
484 sysctl |= RXDWA;
485#endif
486 bfin_write_EMAC_SYSCTL(sysctl);
Bryan Wue190d6b2007-07-17 14:43:44 +0800487
488 bfin_write_EMAC_MMC_CTL(RSTC | CROLL);
489
490 /* Initialize the TX DMA channel registers */
491 bfin_write_DMA2_X_COUNT(0);
492 bfin_write_DMA2_X_MODIFY(4);
493 bfin_write_DMA2_Y_COUNT(0);
494 bfin_write_DMA2_Y_MODIFY(0);
495
496 /* Initialize the RX DMA channel registers */
497 bfin_write_DMA1_X_COUNT(0);
498 bfin_write_DMA1_X_MODIFY(4);
499 bfin_write_DMA1_Y_COUNT(0);
500 bfin_write_DMA1_Y_MODIFY(0);
501}
502
Alex Landau73f83182007-09-19 23:14:18 +0800503static void setup_mac_addr(u8 *mac_addr)
Bryan Wue190d6b2007-07-17 14:43:44 +0800504{
505 u32 addr_low = le32_to_cpu(*(__le32 *) & mac_addr[0]);
506 u16 addr_hi = le16_to_cpu(*(__le16 *) & mac_addr[4]);
507
508 /* this depends on a little-endian machine */
509 bfin_write_EMAC_ADDRLO(addr_low);
510 bfin_write_EMAC_ADDRHI(addr_hi);
511}
512
Alex Landau73f83182007-09-19 23:14:18 +0800513static int bf537mac_set_mac_address(struct net_device *dev, void *p)
514{
515 struct sockaddr *addr = p;
516 if (netif_running(dev))
517 return -EBUSY;
518 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
519 setup_mac_addr(dev->dev_addr);
520 return 0;
521}
522
Bryan Wue190d6b2007-07-17 14:43:44 +0800523static void adjust_tx_list(void)
524{
525 int timeout_cnt = MAX_TIMEOUT_CNT;
526
527 if (tx_list_head->status.status_word != 0
528 && current_tx_ptr != tx_list_head) {
529 goto adjust_head; /* released something, just return; */
530 }
531
532 /*
533 * if nothing released, check wait condition
534 * current's next can not be the head,
535 * otherwise the dma will not stop as we want
536 */
537 if (current_tx_ptr->next->next == tx_list_head) {
538 while (tx_list_head->status.status_word == 0) {
Bryan Wu6db9e462008-01-30 16:52:21 +0800539 mdelay(1);
Bryan Wue190d6b2007-07-17 14:43:44 +0800540 if (tx_list_head->status.status_word != 0
541 || !(bfin_read_DMA2_IRQ_STATUS() & 0x08)) {
542 goto adjust_head;
543 }
544 if (timeout_cnt-- < 0) {
545 printk(KERN_ERR DRV_NAME
546 ": wait for adjust tx list head timeout\n");
547 break;
548 }
549 }
550 if (tx_list_head->status.status_word != 0) {
551 goto adjust_head;
552 }
553 }
554
555 return;
556
557adjust_head:
558 do {
559 tx_list_head->desc_a.config &= ~DMAEN;
560 tx_list_head->status.status_word = 0;
561 if (tx_list_head->skb) {
562 dev_kfree_skb(tx_list_head->skb);
563 tx_list_head->skb = NULL;
564 } else {
565 printk(KERN_ERR DRV_NAME
566 ": no sk_buff in a transmitted frame!\n");
567 }
568 tx_list_head = tx_list_head->next;
569 } while (tx_list_head->status.status_word != 0
570 && current_tx_ptr != tx_list_head);
571 return;
572
573}
574
575static int bf537mac_hard_start_xmit(struct sk_buff *skb,
576 struct net_device *dev)
577{
578 struct bf537mac_local *lp = netdev_priv(dev);
579 unsigned int data;
580
581 current_tx_ptr->skb = skb;
582
583 /*
584 * Is skb->data always 16-bit aligned?
585 * Do we need to memcpy((char *)(tail->packet + 2), skb->data, len)?
586 */
587 if ((((unsigned int)(skb->data)) & 0x02) == 2) {
588 /* move skb->data to current_tx_ptr payload */
589 data = (unsigned int)(skb->data) - 2;
590 *((unsigned short *)data) = (unsigned short)(skb->len);
591 current_tx_ptr->desc_a.start_addr = (unsigned long)data;
592 /* this is important! */
593 blackfin_dcache_flush_range(data, (data + (skb->len)) + 2);
594
595 } else {
596 *((unsigned short *)(current_tx_ptr->packet)) =
597 (unsigned short)(skb->len);
598 memcpy((char *)(current_tx_ptr->packet + 2), skb->data,
599 (skb->len));
600 current_tx_ptr->desc_a.start_addr =
601 (unsigned long)current_tx_ptr->packet;
602 if (current_tx_ptr->status.status_word != 0)
603 current_tx_ptr->status.status_word = 0;
604 blackfin_dcache_flush_range((unsigned int)current_tx_ptr->
605 packet,
606 (unsigned int)(current_tx_ptr->
607 packet + skb->len) +
608 2);
609 }
610
611 /* enable this packet's dma */
612 current_tx_ptr->desc_a.config |= DMAEN;
613
614 /* tx dma is running, just return */
615 if (bfin_read_DMA2_IRQ_STATUS() & 0x08)
616 goto out;
617
618 /* tx dma is not running */
619 bfin_write_DMA2_NEXT_DESC_PTR(&(current_tx_ptr->desc_a));
620 /* dma enabled, read from memory, size is 6 */
621 bfin_write_DMA2_CONFIG(current_tx_ptr->desc_a.config);
622 /* Turn on the EMAC tx */
623 bfin_write_EMAC_OPMODE(bfin_read_EMAC_OPMODE() | TE);
624
625out:
626 adjust_tx_list();
627 current_tx_ptr = current_tx_ptr->next;
628 dev->trans_start = jiffies;
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700629 dev->stats.tx_packets++;
630 dev->stats.tx_bytes += (skb->len);
Bryan Wue190d6b2007-07-17 14:43:44 +0800631 return 0;
632}
633
634static void bf537mac_rx(struct net_device *dev)
635{
636 struct sk_buff *skb, *new_skb;
637 struct bf537mac_local *lp = netdev_priv(dev);
638 unsigned short len;
639
640 /* allocate a new skb for next time receive */
641 skb = current_rx_ptr->skb;
642 new_skb = dev_alloc_skb(PKT_BUF_SZ + 2);
643 if (!new_skb) {
644 printk(KERN_NOTICE DRV_NAME
645 ": rx: low on mem - packet dropped\n");
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700646 dev->stats.rx_dropped++;
Bryan Wue190d6b2007-07-17 14:43:44 +0800647 goto out;
648 }
649 /* reserve 2 bytes for RXDWA padding */
650 skb_reserve(new_skb, 2);
651 current_rx_ptr->skb = new_skb;
652 current_rx_ptr->desc_a.start_addr = (unsigned long)new_skb->data - 2;
653
654 len = (unsigned short)((current_rx_ptr->status.status_word) & RX_FRLEN);
655 skb_put(skb, len);
656 blackfin_dcache_invalidate_range((unsigned long)skb->head,
657 (unsigned long)skb->tail);
658
659 dev->last_rx = jiffies;
660 skb->dev = dev;
661 skb->protocol = eth_type_trans(skb, dev);
662#if defined(BFIN_MAC_CSUM_OFFLOAD)
663 skb->csum = current_rx_ptr->status.ip_payload_csum;
Vitja Makarov00ff49a2007-11-23 17:55:51 +0800664 skb->ip_summed = CHECKSUM_COMPLETE;
Bryan Wue190d6b2007-07-17 14:43:44 +0800665#endif
666
667 netif_rx(skb);
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700668 dev->stats.rx_packets++;
669 dev->stats.rx_bytes += len;
Bryan Wue190d6b2007-07-17 14:43:44 +0800670 current_rx_ptr->status.status_word = 0x00000000;
671 current_rx_ptr = current_rx_ptr->next;
672
673out:
674 return;
675}
676
677/* interrupt routine to handle rx and error signal */
678static irqreturn_t bf537mac_interrupt(int irq, void *dev_id)
679{
680 struct net_device *dev = dev_id;
681 int number = 0;
682
683get_one_packet:
684 if (current_rx_ptr->status.status_word == 0) {
685 /* no more new packet received */
686 if (number == 0) {
687 if (current_rx_ptr->next->status.status_word != 0) {
688 current_rx_ptr = current_rx_ptr->next;
689 goto real_rx;
690 }
691 }
692 bfin_write_DMA1_IRQ_STATUS(bfin_read_DMA1_IRQ_STATUS() |
693 DMA_DONE | DMA_ERR);
694 return IRQ_HANDLED;
695 }
696
697real_rx:
698 bf537mac_rx(dev);
699 number++;
700 goto get_one_packet;
701}
702
703#ifdef CONFIG_NET_POLL_CONTROLLER
704static void bf537mac_poll(struct net_device *dev)
705{
706 disable_irq(IRQ_MAC_RX);
707 bf537mac_interrupt(IRQ_MAC_RX, dev);
708 enable_irq(IRQ_MAC_RX);
709}
710#endif /* CONFIG_NET_POLL_CONTROLLER */
711
Bryan Wu496a34c2007-09-19 23:37:14 +0800712static void bf537mac_disable(void)
Bryan Wue190d6b2007-07-17 14:43:44 +0800713{
714 unsigned int opmode;
715
716 opmode = bfin_read_EMAC_OPMODE();
717 opmode &= (~RE);
718 opmode &= (~TE);
719 /* Turn off the EMAC */
720 bfin_write_EMAC_OPMODE(opmode);
721}
722
723/*
724 * Enable Interrupts, Receive, and Transmit
725 */
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800726static void bf537mac_enable(void)
Bryan Wue190d6b2007-07-17 14:43:44 +0800727{
728 u32 opmode;
729
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800730 pr_debug("%s: %s\n", DRV_NAME, __FUNCTION__);
Bryan Wue190d6b2007-07-17 14:43:44 +0800731
732 /* Set RX DMA */
733 bfin_write_DMA1_NEXT_DESC_PTR(&(rx_list_head->desc_a));
734 bfin_write_DMA1_CONFIG(rx_list_head->desc_a.config);
735
736 /* Wait MII done */
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800737 mdio_poll();
Bryan Wue190d6b2007-07-17 14:43:44 +0800738
739 /* We enable only RX here */
740 /* ASTP : Enable Automatic Pad Stripping
741 PR : Promiscuous Mode for test
742 PSF : Receive frames with total length less than 64 bytes.
743 FDMODE : Full Duplex Mode
744 LB : Internal Loopback for test
745 RE : Receiver Enable */
746 opmode = bfin_read_EMAC_OPMODE();
747 if (opmode & FDMODE)
748 opmode |= PSF;
749 else
750 opmode |= DRO | DC | PSF;
751 opmode |= RE;
752
753#if defined(CONFIG_BFIN_MAC_RMII)
754 opmode |= RMII; /* For Now only 100MBit are supported */
Michael Hennerich6893ff12008-01-30 16:52:25 +0800755#if (defined(CONFIG_BF537) || defined(CONFIG_BF536)) && CONFIG_BF_REV_0_2
Bryan Wue190d6b2007-07-17 14:43:44 +0800756 opmode |= TE;
757#endif
758#endif
759 /* Turn on the EMAC rx */
760 bfin_write_EMAC_OPMODE(opmode);
Bryan Wue190d6b2007-07-17 14:43:44 +0800761}
762
763/* Our watchdog timed out. Called by the networking layer */
764static void bf537mac_timeout(struct net_device *dev)
765{
766 pr_debug("%s: %s\n", dev->name, __FUNCTION__);
767
Bryan Wu496a34c2007-09-19 23:37:14 +0800768 bf537mac_disable();
Bryan Wue190d6b2007-07-17 14:43:44 +0800769
770 /* reset tx queue */
771 tx_list_tail = tx_list_head->next;
772
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800773 bf537mac_enable();
Bryan Wue190d6b2007-07-17 14:43:44 +0800774
775 /* We can accept TX packets again */
776 dev->trans_start = jiffies;
777 netif_wake_queue(dev);
778}
779
Aidan Williams775919b2008-01-30 16:52:23 +0800780static void bf537mac_multicast_hash(struct net_device *dev)
781{
782 u32 emac_hashhi, emac_hashlo;
783 struct dev_mc_list *dmi = dev->mc_list;
784 char *addrs;
785 int i;
786 u32 crc;
787
788 emac_hashhi = emac_hashlo = 0;
789
790 for (i = 0; i < dev->mc_count; i++) {
791 addrs = dmi->dmi_addr;
792 dmi = dmi->next;
793
794 /* skip non-multicast addresses */
795 if (!(*addrs & 1))
796 continue;
797
798 crc = ether_crc(ETH_ALEN, addrs);
799 crc >>= 26;
800
801 if (crc & 0x20)
802 emac_hashhi |= 1 << (crc & 0x1f);
803 else
804 emac_hashlo |= 1 << (crc & 0x1f);
805 }
806
807 bfin_write_EMAC_HASHHI(emac_hashhi);
808 bfin_write_EMAC_HASHLO(emac_hashlo);
809
810 return;
811}
812
Bryan Wue190d6b2007-07-17 14:43:44 +0800813/*
Bryan Wue190d6b2007-07-17 14:43:44 +0800814 * This routine will, depending on the values passed to it,
815 * either make it accept multicast packets, go into
816 * promiscuous mode (for TCPDUMP and cousins) or accept
817 * a select set of multicast packets
818 */
819static void bf537mac_set_multicast_list(struct net_device *dev)
820{
821 u32 sysctl;
822
823 if (dev->flags & IFF_PROMISC) {
824 printk(KERN_INFO "%s: set to promisc mode\n", dev->name);
825 sysctl = bfin_read_EMAC_OPMODE();
826 sysctl |= RAF;
827 bfin_write_EMAC_OPMODE(sysctl);
Aidan Williams775919b2008-01-30 16:52:23 +0800828 } else if (dev->flags & IFF_ALLMULTI) {
Bryan Wue190d6b2007-07-17 14:43:44 +0800829 /* accept all multicast */
830 sysctl = bfin_read_EMAC_OPMODE();
831 sysctl |= PAM;
832 bfin_write_EMAC_OPMODE(sysctl);
Aidan Williams775919b2008-01-30 16:52:23 +0800833 } else if (dev->mc_count) {
834 /* set up multicast hash table */
835 sysctl = bfin_read_EMAC_OPMODE();
836 sysctl |= HM;
837 bfin_write_EMAC_OPMODE(sysctl);
838 bf537mac_multicast_hash(dev);
Bryan Wue190d6b2007-07-17 14:43:44 +0800839 } else {
840 /* clear promisc or multicast mode */
841 sysctl = bfin_read_EMAC_OPMODE();
842 sysctl &= ~(RAF | PAM);
843 bfin_write_EMAC_OPMODE(sysctl);
844 }
845}
846
847/*
848 * this puts the device in an inactive state
849 */
850static void bf537mac_shutdown(struct net_device *dev)
851{
852 /* Turn off the EMAC */
853 bfin_write_EMAC_OPMODE(0x00000000);
854 /* Turn off the EMAC RX DMA */
855 bfin_write_DMA1_CONFIG(0x0000);
856 bfin_write_DMA2_CONFIG(0x0000);
857}
858
859/*
860 * Open and Initialize the interface
861 *
862 * Set up everything, reset the card, etc..
863 */
864static int bf537mac_open(struct net_device *dev)
865{
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800866 struct bf537mac_local *lp = netdev_priv(dev);
Michael Hennerich4af4b842007-07-25 14:09:54 +0800867 int retval;
Bryan Wue190d6b2007-07-17 14:43:44 +0800868 pr_debug("%s: %s\n", dev->name, __FUNCTION__);
869
870 /*
871 * Check that the address is valid. If its not, refuse
872 * to bring the device up. The user must specify an
873 * address using ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx
874 */
875 if (!is_valid_ether_addr(dev->dev_addr)) {
876 printk(KERN_WARNING DRV_NAME ": no valid ethernet hw addr\n");
877 return -EINVAL;
878 }
879
880 /* initial rx and tx list */
Michael Hennerich4af4b842007-07-25 14:09:54 +0800881 retval = desc_list_init();
882
883 if (retval)
884 return retval;
Bryan Wue190d6b2007-07-17 14:43:44 +0800885
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800886 phy_start(lp->phydev);
Bryan Wue190d6b2007-07-17 14:43:44 +0800887 setup_system_regs(dev);
Bryan Wu496a34c2007-09-19 23:37:14 +0800888 bf537mac_disable();
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800889 bf537mac_enable();
Bryan Wue190d6b2007-07-17 14:43:44 +0800890
891 pr_debug("hardware init finished\n");
892 netif_start_queue(dev);
893 netif_carrier_on(dev);
894
895 return 0;
896}
897
898/*
899 *
900 * this makes the board clean up everything that it can
901 * and not talk to the outside world. Caused by
902 * an 'ifconfig ethX down'
903 */
904static int bf537mac_close(struct net_device *dev)
905{
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800906 struct bf537mac_local *lp = netdev_priv(dev);
Bryan Wue190d6b2007-07-17 14:43:44 +0800907 pr_debug("%s: %s\n", dev->name, __FUNCTION__);
908
909 netif_stop_queue(dev);
910 netif_carrier_off(dev);
911
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800912 phy_stop(lp->phydev);
913
Bryan Wue190d6b2007-07-17 14:43:44 +0800914 /* clear everything */
915 bf537mac_shutdown(dev);
916
917 /* free the rx/tx buffers */
918 desc_list_free();
919
920 return 0;
921}
922
923static int __init bf537mac_probe(struct net_device *dev)
924{
925 struct bf537mac_local *lp = netdev_priv(dev);
926 int retval;
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800927 int i;
Bryan Wue190d6b2007-07-17 14:43:44 +0800928
929 /* Grab the MAC address in the MAC */
930 *(__le32 *) (&(dev->dev_addr[0])) = cpu_to_le32(bfin_read_EMAC_ADDRLO());
931 *(__le16 *) (&(dev->dev_addr[4])) = cpu_to_le16((u16) bfin_read_EMAC_ADDRHI());
932
933 /* probe mac */
934 /*todo: how to proble? which is revision_register */
935 bfin_write_EMAC_ADDRLO(0x12345678);
936 if (bfin_read_EMAC_ADDRLO() != 0x12345678) {
937 pr_debug("can't detect bf537 mac!\n");
938 retval = -ENODEV;
939 goto err_out;
940 }
941
942 /* set the GPIO pins to Ethernet mode */
943 retval = setup_pin_mux(1);
Bryan Wue190d6b2007-07-17 14:43:44 +0800944 if (retval)
945 return retval;
946
947 /*Is it valid? (Did bootloader initialize it?) */
948 if (!is_valid_ether_addr(dev->dev_addr)) {
949 /* Grab the MAC from the board somehow - this is done in the
950 arch/blackfin/mach-bf537/boards/eth_mac.c */
Mike Frysinger9862cc52007-11-15 21:21:20 +0800951 bfin_get_ether_addr(dev->dev_addr);
Bryan Wue190d6b2007-07-17 14:43:44 +0800952 }
953
954 /* If still not valid, get a random one */
955 if (!is_valid_ether_addr(dev->dev_addr)) {
956 random_ether_addr(dev->dev_addr);
957 }
958
959 setup_mac_addr(dev->dev_addr);
960
Bryan Wu4ae5a3a2007-09-19 23:37:36 +0800961 /* MDIO bus initial */
962 lp->mii_bus.priv = dev;
963 lp->mii_bus.read = mdiobus_read;
964 lp->mii_bus.write = mdiobus_write;
965 lp->mii_bus.reset = mdiobus_reset;
966 lp->mii_bus.name = "bfin_mac_mdio";
967 lp->mii_bus.id = 0;
968 lp->mii_bus.irq = kmalloc(sizeof(int)*PHY_MAX_ADDR, GFP_KERNEL);
969 for (i = 0; i < PHY_MAX_ADDR; ++i)
970 lp->mii_bus.irq[i] = PHY_POLL;
971
972 mdiobus_register(&lp->mii_bus);
973
974 retval = mii_probe(dev);
975 if (retval)
976 return retval;
977
Bryan Wue190d6b2007-07-17 14:43:44 +0800978 /* Fill in the fields of the device structure with ethernet values. */
979 ether_setup(dev);
980
981 dev->open = bf537mac_open;
982 dev->stop = bf537mac_close;
983 dev->hard_start_xmit = bf537mac_hard_start_xmit;
Alex Landau73f83182007-09-19 23:14:18 +0800984 dev->set_mac_address = bf537mac_set_mac_address;
Bryan Wue190d6b2007-07-17 14:43:44 +0800985 dev->tx_timeout = bf537mac_timeout;
Bryan Wue190d6b2007-07-17 14:43:44 +0800986 dev->set_multicast_list = bf537mac_set_multicast_list;
987#ifdef CONFIG_NET_POLL_CONTROLLER
988 dev->poll_controller = bf537mac_poll;
989#endif
990
Bryan Wue190d6b2007-07-17 14:43:44 +0800991 spin_lock_init(&lp->lock);
992
993 /* now, enable interrupts */
994 /* register irq handler */
995 if (request_irq
996 (IRQ_MAC_RX, bf537mac_interrupt, IRQF_DISABLED | IRQF_SHARED,
Michael Hennerich6893ff12008-01-30 16:52:25 +0800997 "EMAC_RX", dev)) {
Bryan Wue190d6b2007-07-17 14:43:44 +0800998 printk(KERN_WARNING DRV_NAME
999 ": Unable to attach BlackFin MAC RX interrupt\n");
1000 return -EBUSY;
1001 }
1002
Bryan Wue190d6b2007-07-17 14:43:44 +08001003
1004 retval = register_netdev(dev);
1005 if (retval == 0) {
1006 /* now, print out the card info, in a short format.. */
1007 printk(KERN_INFO "%s: Version %s, %s\n",
1008 DRV_NAME, DRV_VERSION, DRV_DESC);
1009 }
1010
1011err_out:
1012 return retval;
1013}
1014
1015static int bfin_mac_probe(struct platform_device *pdev)
1016{
1017 struct net_device *ndev;
1018
1019 ndev = alloc_etherdev(sizeof(struct bf537mac_local));
1020 if (!ndev) {
1021 printk(KERN_WARNING DRV_NAME ": could not allocate device\n");
1022 return -ENOMEM;
1023 }
1024
Bryan Wue190d6b2007-07-17 14:43:44 +08001025 SET_NETDEV_DEV(ndev, &pdev->dev);
1026
1027 platform_set_drvdata(pdev, ndev);
1028
1029 if (bf537mac_probe(ndev) != 0) {
1030 platform_set_drvdata(pdev, NULL);
1031 free_netdev(ndev);
1032 printk(KERN_WARNING DRV_NAME ": not found\n");
1033 return -ENODEV;
1034 }
1035
1036 return 0;
1037}
1038
1039static int bfin_mac_remove(struct platform_device *pdev)
1040{
1041 struct net_device *ndev = platform_get_drvdata(pdev);
1042
1043 platform_set_drvdata(pdev, NULL);
1044
1045 unregister_netdev(ndev);
1046
1047 free_irq(IRQ_MAC_RX, ndev);
1048
1049 free_netdev(ndev);
1050
1051 setup_pin_mux(0);
1052
1053 return 0;
1054}
1055
Bryan Wu496a34c2007-09-19 23:37:14 +08001056#ifdef CONFIG_PM
1057static int bfin_mac_suspend(struct platform_device *pdev, pm_message_t mesg)
Bryan Wue190d6b2007-07-17 14:43:44 +08001058{
Bryan Wu496a34c2007-09-19 23:37:14 +08001059 struct net_device *net_dev = platform_get_drvdata(pdev);
1060
1061 if (netif_running(net_dev))
1062 bf537mac_close(net_dev);
1063
Bryan Wue190d6b2007-07-17 14:43:44 +08001064 return 0;
1065}
1066
1067static int bfin_mac_resume(struct platform_device *pdev)
1068{
Bryan Wu496a34c2007-09-19 23:37:14 +08001069 struct net_device *net_dev = platform_get_drvdata(pdev);
1070
1071 if (netif_running(net_dev))
1072 bf537mac_open(net_dev);
1073
Bryan Wue190d6b2007-07-17 14:43:44 +08001074 return 0;
1075}
Bryan Wu496a34c2007-09-19 23:37:14 +08001076#else
1077#define bfin_mac_suspend NULL
1078#define bfin_mac_resume NULL
1079#endif /* CONFIG_PM */
Bryan Wue190d6b2007-07-17 14:43:44 +08001080
1081static struct platform_driver bfin_mac_driver = {
1082 .probe = bfin_mac_probe,
1083 .remove = bfin_mac_remove,
1084 .resume = bfin_mac_resume,
1085 .suspend = bfin_mac_suspend,
1086 .driver = {
1087 .name = DRV_NAME,
1088 },
1089};
1090
1091static int __init bfin_mac_init(void)
1092{
1093 return platform_driver_register(&bfin_mac_driver);
1094}
1095
1096module_init(bfin_mac_init);
1097
1098static void __exit bfin_mac_cleanup(void)
1099{
1100 platform_driver_unregister(&bfin_mac_driver);
1101}
1102
1103module_exit(bfin_mac_cleanup);