bfin_mac.c 25.4 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49
/*
 * File:	drivers/net/bfin_mac.c
 * Based on:
 * Maintainer:
 * 		Bryan Wu <bryan.wu@analog.com>
 *
 * Original author:
 * 		Luke Yang <luke.yang@analog.com>
 *
 * Created:
 * Description:
 *
 * Modified:
 *		Copyright 2004-2006 Analog Devices Inc.
 *
 * Bugs:	Enter bugs at http://blackfin.uclinux.org/
 *
 * This program is free software ;  you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation ;  either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY ;  without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program ;  see the file COPYING.
 * If not, write to the Free Software Foundation,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/errno.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/crc32.h>
#include <linux/device.h>
#include <linux/spinlock.h>
#include <linux/ethtool.h>
#include <linux/mii.h>
50
#include <linux/phy.h>
51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/platform_device.h>

#include <asm/dma.h>
#include <linux/dma-mapping.h>

#include <asm/blackfin.h>
#include <asm/cacheflush.h>
#include <asm/portmux.h>

#include "bfin_mac.h"

#define DRV_NAME	"bfin_mac"
#define DRV_VERSION	"1.1"
#define DRV_AUTHOR	"Bryan Wu, Luke Yang"
#define DRV_DESC	"Blackfin BF53[67] on-chip Ethernet MAC driver"

MODULE_AUTHOR(DRV_AUTHOR);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION(DRV_DESC);

#if defined(CONFIG_BFIN_MAC_USE_L1)
# define bfin_mac_alloc(dma_handle, size)  l1_data_sram_zalloc(size)
# define bfin_mac_free(dma_handle, ptr)    l1_data_sram_free(ptr)
#else
# define bfin_mac_alloc(dma_handle, size) \
	dma_alloc_coherent(NULL, size, dma_handle, GFP_KERNEL)
# define bfin_mac_free(dma_handle, ptr) \
	dma_free_coherent(NULL, sizeof(*ptr), ptr, dma_handle)
#endif

#define PKT_BUF_SZ 1580

#define MAX_TIMEOUT_CNT	500

/* pointers to maintain transmit list */
static struct net_dma_desc_tx *tx_list_head;
static struct net_dma_desc_tx *tx_list_tail;
static struct net_dma_desc_rx *rx_list_head;
static struct net_dma_desc_rx *rx_list_tail;
static struct net_dma_desc_rx *current_rx_ptr;
static struct net_dma_desc_tx *current_tx_ptr;
static struct net_dma_desc_tx *tx_desc;
static struct net_dma_desc_rx *rx_desc;

98 99 100
static void bf537mac_disable(void);
static void bf537mac_enable(void);

101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288
static void desc_list_free(void)
{
	struct net_dma_desc_rx *r;
	struct net_dma_desc_tx *t;
	int i;
#if !defined(CONFIG_BFIN_MAC_USE_L1)
	dma_addr_t dma_handle = 0;
#endif

	if (tx_desc) {
		t = tx_list_head;
		for (i = 0; i < CONFIG_BFIN_TX_DESC_NUM; i++) {
			if (t) {
				if (t->skb) {
					dev_kfree_skb(t->skb);
					t->skb = NULL;
				}
				t = t->next;
			}
		}
		bfin_mac_free(dma_handle, tx_desc);
	}

	if (rx_desc) {
		r = rx_list_head;
		for (i = 0; i < CONFIG_BFIN_RX_DESC_NUM; i++) {
			if (r) {
				if (r->skb) {
					dev_kfree_skb(r->skb);
					r->skb = NULL;
				}
				r = r->next;
			}
		}
		bfin_mac_free(dma_handle, rx_desc);
	}
}

static int desc_list_init(void)
{
	int i;
	struct sk_buff *new_skb;
#if !defined(CONFIG_BFIN_MAC_USE_L1)
	/*
	 * This dma_handle is useless in Blackfin dma_alloc_coherent().
	 * The real dma handler is the return value of dma_alloc_coherent().
	 */
	dma_addr_t dma_handle;
#endif

	tx_desc = bfin_mac_alloc(&dma_handle,
				sizeof(struct net_dma_desc_tx) *
				CONFIG_BFIN_TX_DESC_NUM);
	if (tx_desc == NULL)
		goto init_error;

	rx_desc = bfin_mac_alloc(&dma_handle,
				sizeof(struct net_dma_desc_rx) *
				CONFIG_BFIN_RX_DESC_NUM);
	if (rx_desc == NULL)
		goto init_error;

	/* init tx_list */
	tx_list_head = tx_list_tail = tx_desc;

	for (i = 0; i < CONFIG_BFIN_TX_DESC_NUM; i++) {
		struct net_dma_desc_tx *t = tx_desc + i;
		struct dma_descriptor *a = &(t->desc_a);
		struct dma_descriptor *b = &(t->desc_b);

		/*
		 * disable DMA
		 * read from memory WNR = 0
		 * wordsize is 32 bits
		 * 6 half words is desc size
		 * large desc flow
		 */
		a->config = WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE;
		a->start_addr = (unsigned long)t->packet;
		a->x_count = 0;
		a->next_dma_desc = b;

		/*
		 * enabled DMA
		 * write to memory WNR = 1
		 * wordsize is 32 bits
		 * disable interrupt
		 * 6 half words is desc size
		 * large desc flow
		 */
		b->config = DMAEN | WNR | WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE;
		b->start_addr = (unsigned long)(&(t->status));
		b->x_count = 0;

		t->skb = NULL;
		tx_list_tail->desc_b.next_dma_desc = a;
		tx_list_tail->next = t;
		tx_list_tail = t;
	}
	tx_list_tail->next = tx_list_head;	/* tx_list is a circle */
	tx_list_tail->desc_b.next_dma_desc = &(tx_list_head->desc_a);
	current_tx_ptr = tx_list_head;

	/* init rx_list */
	rx_list_head = rx_list_tail = rx_desc;

	for (i = 0; i < CONFIG_BFIN_RX_DESC_NUM; i++) {
		struct net_dma_desc_rx *r = rx_desc + i;
		struct dma_descriptor *a = &(r->desc_a);
		struct dma_descriptor *b = &(r->desc_b);

		/* allocate a new skb for next time receive */
		new_skb = dev_alloc_skb(PKT_BUF_SZ + 2);
		if (!new_skb) {
			printk(KERN_NOTICE DRV_NAME
			       ": init: low on mem - packet dropped\n");
			goto init_error;
		}
		skb_reserve(new_skb, 2);
		r->skb = new_skb;

		/*
		 * enabled DMA
		 * write to memory WNR = 1
		 * wordsize is 32 bits
		 * disable interrupt
		 * 6 half words is desc size
		 * large desc flow
		 */
		a->config = DMAEN | WNR | WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE;
		/* since RXDWA is enabled */
		a->start_addr = (unsigned long)new_skb->data - 2;
		a->x_count = 0;
		a->next_dma_desc = b;

		/*
		 * enabled DMA
		 * write to memory WNR = 1
		 * wordsize is 32 bits
		 * enable interrupt
		 * 6 half words is desc size
		 * large desc flow
		 */
		b->config = DMAEN | WNR | WDSIZE_32 | DI_EN |
				NDSIZE_6 | DMAFLOW_LARGE;
		b->start_addr = (unsigned long)(&(r->status));
		b->x_count = 0;

		rx_list_tail->desc_b.next_dma_desc = a;
		rx_list_tail->next = r;
		rx_list_tail = r;
	}
	rx_list_tail->next = rx_list_head;	/* rx_list is a circle */
	rx_list_tail->desc_b.next_dma_desc = &(rx_list_head->desc_a);
	current_rx_ptr = rx_list_head;

	return 0;

init_error:
	desc_list_free();
	printk(KERN_ERR DRV_NAME ": kmalloc failed\n");
	return -ENOMEM;
}


/*---PHY CONTROL AND CONFIGURATION-----------------------------------------*/

/* Set FER regs to MUX in Ethernet pins */
static int setup_pin_mux(int action)
{
#if defined(CONFIG_BFIN_MAC_RMII)
	u16 pin_req[] = P_RMII0;
#else
	u16 pin_req[] = P_MII0;
#endif

	if (action) {
		if (peripheral_request_list(pin_req, DRV_NAME)) {
			printk(KERN_ERR DRV_NAME
			": Requesting Peripherals failed\n");
			return -EFAULT;
		}
	} else
		peripheral_free_list(pin_req);

	return 0;
}

289 290 291
/*
 * MII operations
 */
292
/* Wait until the previous MDC/MDIO transaction has completed */
293
static void mdio_poll(void)
294 295 296 297 298 299 300 301 302 303 304 305 306 307 308
{
	int timeout_cnt = MAX_TIMEOUT_CNT;

	/* poll the STABUSY bit */
	while ((bfin_read_EMAC_STAADD()) & STABUSY) {
		mdelay(10);
		if (timeout_cnt-- < 0) {
			printk(KERN_ERR DRV_NAME
			": wait MDC/MDIO transaction to complete timeout\n");
			break;
		}
	}
}

/* Read an off-chip register in a PHY through the MDC/MDIO port */
309
static int mdiobus_read(struct mii_bus *bus, int phy_addr, int regnum)
310
{
311 312
	mdio_poll();

313
	/* read mode */
314 315
	bfin_write_EMAC_STAADD(SET_PHYAD((u16) phy_addr) |
				SET_REGAD((u16) regnum) |
316 317
				STABUSY);

318 319 320
	mdio_poll();

	return (int) bfin_read_EMAC_STADAT();
321 322 323
}

/* Write an off-chip register in a PHY through the MDC/MDIO port */
324 325
static int mdiobus_write(struct mii_bus *bus, int phy_addr, int regnum,
			 u16 value)
326
{
327 328 329
	mdio_poll();

	bfin_write_EMAC_STADAT((u32) value);
330 331

	/* write mode */
332 333
	bfin_write_EMAC_STAADD(SET_PHYAD((u16) phy_addr) |
				SET_REGAD((u16) regnum) |
334 335 336
				STAOP |
				STABUSY);

337 338 339
	mdio_poll();

	return 0;
340 341
}

342
static int mdiobus_reset(struct mii_bus *bus)
343
{
344
	return 0;
345 346
}

347
static void bf537_adjust_link(struct net_device *dev)
348 349
{
	struct bf537mac_local *lp = netdev_priv(dev);
350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369
	struct phy_device *phydev = lp->phydev;
	unsigned long flags;
	int new_state = 0;

	spin_lock_irqsave(&lp->lock, flags);
	if (phydev->link) {
		/* Now we make sure that we can be in full duplex mode.
		 * If not, we operate in half-duplex mode. */
		if (phydev->duplex != lp->old_duplex) {
			u32 opmode = bfin_read_EMAC_OPMODE();
			new_state = 1;

			if (phydev->duplex)
				opmode |= FDMODE;
			else
				opmode &= ~(FDMODE);

			bfin_write_EMAC_OPMODE(opmode);
			lp->old_duplex = phydev->duplex;
		}
370

371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388
		if (phydev->speed != lp->old_speed) {
#if defined(CONFIG_BFIN_MAC_RMII)
			u32 opmode = bfin_read_EMAC_OPMODE();
			switch (phydev->speed) {
			case 10:
				opmode |= RMII_10;
				break;
			case 100:
				opmode &= ~(RMII_10);
				break;
			default:
				printk(KERN_WARNING
					"%s: Ack!  Speed (%d) is not 10/100!\n",
					DRV_NAME, phydev->speed);
				break;
			}
			bfin_write_EMAC_OPMODE(opmode);
#endif
389

390 391 392
			new_state = 1;
			lp->old_speed = phydev->speed;
		}
393

394 395 396 397 398 399 400 401 402 403
		if (!lp->old_link) {
			new_state = 1;
			lp->old_link = 1;
			netif_schedule(dev);
		}
	} else if (lp->old_link) {
		new_state = 1;
		lp->old_link = 0;
		lp->old_speed = 0;
		lp->old_duplex = -1;
404 405
	}

406 407 408 409
	if (new_state) {
		u32 opmode = bfin_read_EMAC_OPMODE();
		phy_print_status(phydev);
		pr_debug("EMAC_OPMODE = 0x%08x\n", opmode);
410
	}
411 412

	spin_unlock_irqrestore(&lp->lock, flags);
413 414
}

415
static int mii_probe(struct net_device *dev)
416 417
{
	struct bf537mac_local *lp = netdev_priv(dev);
418 419 420
	struct phy_device *phydev = NULL;
	unsigned short sysctl;
	int i;
421

422
	/* Enable PHY output early */
423 424 425 426
	if (!(bfin_read_VR_CTL() & PHYCLKOE))
		bfin_write_VR_CTL(bfin_read_VR_CTL() | PHYCLKOE);

	/* MDC  = 2.5 MHz */
427 428
	sysctl = bfin_read_EMAC_SYSCTL();
	sysctl |= SET_MDCDIV(24);
429 430
	bfin_write_EMAC_SYSCTL(sysctl);

431 432 433
	/* search for connect PHY device */
	for (i = 0; i < PHY_MAX_ADDR; i++) {
		struct phy_device *const tmp_phydev = lp->mii_bus.phy_map[i];
434

435 436
		if (!tmp_phydev)
			continue; /* no PHY here... */
437

438 439 440 441 442 443 444 445 446
		phydev = tmp_phydev;
		break; /* found it */
	}

	/* now we are supposed to have a proper phydev, to attach to... */
	if (!phydev) {
		printk(KERN_INFO "%s: Don't found any phy device at all\n",
			dev->name);
		return -ENODEV;
447 448 449
	}

#if defined(CONFIG_BFIN_MAC_RMII)
450 451 452 453 454
	phydev = phy_connect(dev, phydev->dev.bus_id, &bf537_adjust_link, 0,
			PHY_INTERFACE_MODE_RMII);
#else
	phydev = phy_connect(dev, phydev->dev.bus_id, &bf537_adjust_link, 0,
			PHY_INTERFACE_MODE_MII);
455 456
#endif

457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501
	if (IS_ERR(phydev)) {
		printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
		return PTR_ERR(phydev);
	}

	/* mask with MAC supported features */
	phydev->supported &= (SUPPORTED_10baseT_Half
			      | SUPPORTED_10baseT_Full
			      | SUPPORTED_100baseT_Half
			      | SUPPORTED_100baseT_Full
			      | SUPPORTED_Autoneg
			      | SUPPORTED_Pause | SUPPORTED_Asym_Pause
			      | SUPPORTED_MII
			      | SUPPORTED_TP);

	phydev->advertising = phydev->supported;

	lp->old_link = 0;
	lp->old_speed = 0;
	lp->old_duplex = -1;
	lp->phydev = phydev;

	printk(KERN_INFO "%s: attached PHY driver [%s] "
	       "(mii_bus:phy_addr=%s, irq=%d)\n",
	       DRV_NAME, phydev->drv->name, phydev->dev.bus_id, phydev->irq);

	return 0;
}

/**************************************************************************/
void setup_system_regs(struct net_device *dev)
{
	unsigned short sysctl;

	/*
	 * Odd word alignment for Receive Frame DMA word
	 * Configure checksum support and rcve frame word alignment
	 */
	sysctl = bfin_read_EMAC_SYSCTL();
#if defined(BFIN_MAC_CSUM_OFFLOAD)
	sysctl |= RXDWA | RXCKS;
#else
	sysctl |= RXDWA;
#endif
	bfin_write_EMAC_SYSCTL(sysctl);
502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517

	bfin_write_EMAC_MMC_CTL(RSTC | CROLL);

	/* Initialize the TX DMA channel registers */
	bfin_write_DMA2_X_COUNT(0);
	bfin_write_DMA2_X_MODIFY(4);
	bfin_write_DMA2_Y_COUNT(0);
	bfin_write_DMA2_Y_MODIFY(0);

	/* Initialize the RX DMA channel registers */
	bfin_write_DMA1_X_COUNT(0);
	bfin_write_DMA1_X_MODIFY(4);
	bfin_write_DMA1_Y_COUNT(0);
	bfin_write_DMA1_Y_MODIFY(0);
}

518
static void setup_mac_addr(u8 *mac_addr)
519 520 521 522 523 524 525 526 527
{
	u32 addr_low = le32_to_cpu(*(__le32 *) & mac_addr[0]);
	u16 addr_hi = le16_to_cpu(*(__le16 *) & mac_addr[4]);

	/* this depends on a little-endian machine */
	bfin_write_EMAC_ADDRLO(addr_low);
	bfin_write_EMAC_ADDRHI(addr_hi);
}

528 529 530 531 532 533 534 535 536 537
static int bf537mac_set_mac_address(struct net_device *dev, void *p)
{
	struct sockaddr *addr = p;
	if (netif_running(dev))
		return -EBUSY;
	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
	setup_mac_addr(dev->dev_addr);
	return 0;
}

538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643
static void adjust_tx_list(void)
{
	int timeout_cnt = MAX_TIMEOUT_CNT;

	if (tx_list_head->status.status_word != 0
	    && current_tx_ptr != tx_list_head) {
		goto adjust_head;	/* released something, just return; */
	}

	/*
	 * if nothing released, check wait condition
	 * current's next can not be the head,
	 * otherwise the dma will not stop as we want
	 */
	if (current_tx_ptr->next->next == tx_list_head) {
		while (tx_list_head->status.status_word == 0) {
			mdelay(10);
			if (tx_list_head->status.status_word != 0
			    || !(bfin_read_DMA2_IRQ_STATUS() & 0x08)) {
				goto adjust_head;
			}
			if (timeout_cnt-- < 0) {
				printk(KERN_ERR DRV_NAME
				": wait for adjust tx list head timeout\n");
				break;
			}
		}
		if (tx_list_head->status.status_word != 0) {
			goto adjust_head;
		}
	}

	return;

adjust_head:
	do {
		tx_list_head->desc_a.config &= ~DMAEN;
		tx_list_head->status.status_word = 0;
		if (tx_list_head->skb) {
			dev_kfree_skb(tx_list_head->skb);
			tx_list_head->skb = NULL;
		} else {
			printk(KERN_ERR DRV_NAME
			       ": no sk_buff in a transmitted frame!\n");
		}
		tx_list_head = tx_list_head->next;
	} while (tx_list_head->status.status_word != 0
		 && current_tx_ptr != tx_list_head);
	return;

}

static int bf537mac_hard_start_xmit(struct sk_buff *skb,
				struct net_device *dev)
{
	struct bf537mac_local *lp = netdev_priv(dev);
	unsigned int data;

	current_tx_ptr->skb = skb;

	/*
	 * Is skb->data always 16-bit aligned?
	 * Do we need to memcpy((char *)(tail->packet + 2), skb->data, len)?
	 */
	if ((((unsigned int)(skb->data)) & 0x02) == 2) {
		/* move skb->data to current_tx_ptr payload */
		data = (unsigned int)(skb->data) - 2;
		*((unsigned short *)data) = (unsigned short)(skb->len);
		current_tx_ptr->desc_a.start_addr = (unsigned long)data;
		/* this is important! */
		blackfin_dcache_flush_range(data, (data + (skb->len)) + 2);

	} else {
		*((unsigned short *)(current_tx_ptr->packet)) =
		    (unsigned short)(skb->len);
		memcpy((char *)(current_tx_ptr->packet + 2), skb->data,
		       (skb->len));
		current_tx_ptr->desc_a.start_addr =
		    (unsigned long)current_tx_ptr->packet;
		if (current_tx_ptr->status.status_word != 0)
			current_tx_ptr->status.status_word = 0;
		blackfin_dcache_flush_range((unsigned int)current_tx_ptr->
					    packet,
					    (unsigned int)(current_tx_ptr->
							   packet + skb->len) +
					    2);
	}

	/* enable this packet's dma */
	current_tx_ptr->desc_a.config |= DMAEN;

	/* tx dma is running, just return */
	if (bfin_read_DMA2_IRQ_STATUS() & 0x08)
		goto out;

	/* tx dma is not running */
	bfin_write_DMA2_NEXT_DESC_PTR(&(current_tx_ptr->desc_a));
	/* dma enabled, read from memory, size is 6 */
	bfin_write_DMA2_CONFIG(current_tx_ptr->desc_a.config);
	/* Turn on the EMAC tx */
	bfin_write_EMAC_OPMODE(bfin_read_EMAC_OPMODE() | TE);

out:
	adjust_tx_list();
	current_tx_ptr = current_tx_ptr->next;
	dev->trans_start = jiffies;
644 645
	dev->stats.tx_packets++;
	dev->stats.tx_bytes += (skb->len);
646 647 648 649 650 651 652 653 654 655 656 657 658 659 660
	return 0;
}

static void bf537mac_rx(struct net_device *dev)
{
	struct sk_buff *skb, *new_skb;
	struct bf537mac_local *lp = netdev_priv(dev);
	unsigned short len;

	/* allocate a new skb for next time receive */
	skb = current_rx_ptr->skb;
	new_skb = dev_alloc_skb(PKT_BUF_SZ + 2);
	if (!new_skb) {
		printk(KERN_NOTICE DRV_NAME
		       ": rx: low on mem - packet dropped\n");
661
		dev->stats.rx_dropped++;
662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682
		goto out;
	}
	/* reserve 2 bytes for RXDWA padding */
	skb_reserve(new_skb, 2);
	current_rx_ptr->skb = new_skb;
	current_rx_ptr->desc_a.start_addr = (unsigned long)new_skb->data - 2;

	len = (unsigned short)((current_rx_ptr->status.status_word) & RX_FRLEN);
	skb_put(skb, len);
	blackfin_dcache_invalidate_range((unsigned long)skb->head,
					 (unsigned long)skb->tail);

	dev->last_rx = jiffies;
	skb->dev = dev;
	skb->protocol = eth_type_trans(skb, dev);
#if defined(BFIN_MAC_CSUM_OFFLOAD)
	skb->csum = current_rx_ptr->status.ip_payload_csum;
	skb->ip_summed = CHECKSUM_PARTIAL;
#endif

	netif_rx(skb);
683 684
	dev->stats.rx_packets++;
	dev->stats.rx_bytes += len;
685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726
	current_rx_ptr->status.status_word = 0x00000000;
	current_rx_ptr = current_rx_ptr->next;

out:
	return;
}

/* interrupt routine to handle rx and error signal */
static irqreturn_t bf537mac_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = dev_id;
	int number = 0;

get_one_packet:
	if (current_rx_ptr->status.status_word == 0) {
		/* no more new packet received */
		if (number == 0) {
			if (current_rx_ptr->next->status.status_word != 0) {
				current_rx_ptr = current_rx_ptr->next;
				goto real_rx;
			}
		}
		bfin_write_DMA1_IRQ_STATUS(bfin_read_DMA1_IRQ_STATUS() |
					   DMA_DONE | DMA_ERR);
		return IRQ_HANDLED;
	}

real_rx:
	bf537mac_rx(dev);
	number++;
	goto get_one_packet;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void bf537mac_poll(struct net_device *dev)
{
	disable_irq(IRQ_MAC_RX);
	bf537mac_interrupt(IRQ_MAC_RX, dev);
	enable_irq(IRQ_MAC_RX);
}
#endif				/* CONFIG_NET_POLL_CONTROLLER */

727
static void bf537mac_disable(void)
728 729 730 731 732 733 734 735 736 737 738 739 740
{
	unsigned int opmode;

	opmode = bfin_read_EMAC_OPMODE();
	opmode &= (~RE);
	opmode &= (~TE);
	/* Turn off the EMAC */
	bfin_write_EMAC_OPMODE(opmode);
}

/*
 * Enable Interrupts, Receive, and Transmit
 */
741
static void bf537mac_enable(void)
742 743 744
{
	u32 opmode;

745
	pr_debug("%s: %s\n", DRV_NAME, __FUNCTION__);
746 747 748 749 750 751

	/* Set RX DMA */
	bfin_write_DMA1_NEXT_DESC_PTR(&(rx_list_head->desc_a));
	bfin_write_DMA1_CONFIG(rx_list_head->desc_a.config);

	/* Wait MII done */
752
	mdio_poll();
753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782

	/* We enable only RX here */
	/* ASTP   : Enable Automatic Pad Stripping
	   PR     : Promiscuous Mode for test
	   PSF    : Receive frames with total length less than 64 bytes.
	   FDMODE : Full Duplex Mode
	   LB     : Internal Loopback for test
	   RE     : Receiver Enable */
	opmode = bfin_read_EMAC_OPMODE();
	if (opmode & FDMODE)
		opmode |= PSF;
	else
		opmode |= DRO | DC | PSF;
	opmode |= RE;

#if defined(CONFIG_BFIN_MAC_RMII)
	opmode |= RMII; /* For Now only 100MBit are supported */
#ifdef CONFIG_BF_REV_0_2
	opmode |= TE;
#endif
#endif
	/* Turn on the EMAC rx */
	bfin_write_EMAC_OPMODE(opmode);
}

/* Our watchdog timed out. Called by the networking layer */
static void bf537mac_timeout(struct net_device *dev)
{
	pr_debug("%s: %s\n", dev->name, __FUNCTION__);

783
	bf537mac_disable();
784 785 786 787

	/* reset tx queue */
	tx_list_tail = tx_list_head->next;

788
	bf537mac_enable();
789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841

	/* We can accept TX packets again */
	dev->trans_start = jiffies;
	netif_wake_queue(dev);
}

/*
 * This routine will, depending on the values passed to it,
 * either make it accept multicast packets, go into
 * promiscuous mode (for TCPDUMP and cousins) or accept
 * a select set of multicast packets
 */
static void bf537mac_set_multicast_list(struct net_device *dev)
{
	u32 sysctl;

	if (dev->flags & IFF_PROMISC) {
		printk(KERN_INFO "%s: set to promisc mode\n", dev->name);
		sysctl = bfin_read_EMAC_OPMODE();
		sysctl |= RAF;
		bfin_write_EMAC_OPMODE(sysctl);
	} else if (dev->flags & IFF_ALLMULTI || dev->mc_count) {
		/* accept all multicast */
		sysctl = bfin_read_EMAC_OPMODE();
		sysctl |= PAM;
		bfin_write_EMAC_OPMODE(sysctl);
	} else {
		/* clear promisc or multicast mode */
		sysctl = bfin_read_EMAC_OPMODE();
		sysctl &= ~(RAF | PAM);
		bfin_write_EMAC_OPMODE(sysctl);
	}
}

/*
 * this puts the device in an inactive state
 */
static void bf537mac_shutdown(struct net_device *dev)
{
	/* Turn off the EMAC */
	bfin_write_EMAC_OPMODE(0x00000000);
	/* Turn off the EMAC RX DMA */
	bfin_write_DMA1_CONFIG(0x0000);
	bfin_write_DMA2_CONFIG(0x0000);
}

/*
 * Open and Initialize the interface
 *
 * Set up everything, reset the card, etc..
 */
static int bf537mac_open(struct net_device *dev)
{
842
	struct bf537mac_local *lp = netdev_priv(dev);
843
	int retval;
844 845 846 847 848 849 850 851 852 853 854 855 856
	pr_debug("%s: %s\n", dev->name, __FUNCTION__);

	/*
	 * Check that the address is valid.  If its not, refuse
	 * to bring the device up.  The user must specify an
	 * address using ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx
	 */
	if (!is_valid_ether_addr(dev->dev_addr)) {
		printk(KERN_WARNING DRV_NAME ": no valid ethernet hw addr\n");
		return -EINVAL;
	}

	/* initial rx and tx list */
857 858 859 860
	retval = desc_list_init();

	if (retval)
		return retval;
861

862
	phy_start(lp->phydev);
863
	setup_system_regs(dev);
864
	bf537mac_disable();
865
	bf537mac_enable();
866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881

	pr_debug("hardware init finished\n");
	netif_start_queue(dev);
	netif_carrier_on(dev);

	return 0;
}

/*
 *
 * this makes the board clean up everything that it can
 * and not talk to the outside world.   Caused by
 * an 'ifconfig ethX down'
 */
static int bf537mac_close(struct net_device *dev)
{
882
	struct bf537mac_local *lp = netdev_priv(dev);
883 884 885 886 887
	pr_debug("%s: %s\n", dev->name, __FUNCTION__);

	netif_stop_queue(dev);
	netif_carrier_off(dev);

888 889
	phy_stop(lp->phydev);

890 891 892 893 894 895 896 897 898 899 900 901 902
	/* clear everything */
	bf537mac_shutdown(dev);

	/* free the rx/tx buffers */
	desc_list_free();

	return 0;
}

static int __init bf537mac_probe(struct net_device *dev)
{
	struct bf537mac_local *lp = netdev_priv(dev);
	int retval;
903
	int i;
904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936

	/* Grab the MAC address in the MAC */
	*(__le32 *) (&(dev->dev_addr[0])) = cpu_to_le32(bfin_read_EMAC_ADDRLO());
	*(__le16 *) (&(dev->dev_addr[4])) = cpu_to_le16((u16) bfin_read_EMAC_ADDRHI());

	/* probe mac */
	/*todo: how to proble? which is revision_register */
	bfin_write_EMAC_ADDRLO(0x12345678);
	if (bfin_read_EMAC_ADDRLO() != 0x12345678) {
		pr_debug("can't detect bf537 mac!\n");
		retval = -ENODEV;
		goto err_out;
	}

	/* set the GPIO pins to Ethernet mode */
	retval = setup_pin_mux(1);
	if (retval)
		return retval;

	/*Is it valid? (Did bootloader initialize it?) */
	if (!is_valid_ether_addr(dev->dev_addr)) {
		/* Grab the MAC from the board somehow - this is done in the
		   arch/blackfin/mach-bf537/boards/eth_mac.c */
		get_bf537_ether_addr(dev->dev_addr);
	}

	/* If still not valid, get a random one */
	if (!is_valid_ether_addr(dev->dev_addr)) {
		random_ether_addr(dev->dev_addr);
	}

	setup_mac_addr(dev->dev_addr);

937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953
	/* MDIO bus initial */
	lp->mii_bus.priv = dev;
	lp->mii_bus.read = mdiobus_read;
	lp->mii_bus.write = mdiobus_write;
	lp->mii_bus.reset = mdiobus_reset;
	lp->mii_bus.name = "bfin_mac_mdio";
	lp->mii_bus.id = 0;
	lp->mii_bus.irq = kmalloc(sizeof(int)*PHY_MAX_ADDR, GFP_KERNEL);
	for (i = 0; i < PHY_MAX_ADDR; ++i)
		lp->mii_bus.irq[i] = PHY_POLL;

	mdiobus_register(&lp->mii_bus);

	retval = mii_probe(dev);
	if (retval)
		return retval;

954 955 956 957 958 959
	/* Fill in the fields of the device structure with ethernet values. */
	ether_setup(dev);

	dev->open = bf537mac_open;
	dev->stop = bf537mac_close;
	dev->hard_start_xmit = bf537mac_hard_start_xmit;
960
	dev->set_mac_address = bf537mac_set_mac_address;
961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031
	dev->tx_timeout = bf537mac_timeout;
	dev->set_multicast_list = bf537mac_set_multicast_list;
#ifdef CONFIG_NET_POLL_CONTROLLER
	dev->poll_controller = bf537mac_poll;
#endif

	spin_lock_init(&lp->lock);

	/* now, enable interrupts */
	/* register irq handler */
	if (request_irq
	    (IRQ_MAC_RX, bf537mac_interrupt, IRQF_DISABLED | IRQF_SHARED,
	     "BFIN537_MAC_RX", dev)) {
		printk(KERN_WARNING DRV_NAME
		       ": Unable to attach BlackFin MAC RX interrupt\n");
		return -EBUSY;
	}


	retval = register_netdev(dev);
	if (retval == 0) {
		/* now, print out the card info, in a short format.. */
		printk(KERN_INFO "%s: Version %s, %s\n",
			 DRV_NAME, DRV_VERSION, DRV_DESC);
	}

err_out:
	return retval;
}

static int bfin_mac_probe(struct platform_device *pdev)
{
	struct net_device *ndev;

	ndev = alloc_etherdev(sizeof(struct bf537mac_local));
	if (!ndev) {
		printk(KERN_WARNING DRV_NAME ": could not allocate device\n");
		return -ENOMEM;
	}

	SET_NETDEV_DEV(ndev, &pdev->dev);

	platform_set_drvdata(pdev, ndev);

	if (bf537mac_probe(ndev) != 0) {
		platform_set_drvdata(pdev, NULL);
		free_netdev(ndev);
		printk(KERN_WARNING DRV_NAME ": not found\n");
		return -ENODEV;
	}

	return 0;
}

static int bfin_mac_remove(struct platform_device *pdev)
{
	struct net_device *ndev = platform_get_drvdata(pdev);

	platform_set_drvdata(pdev, NULL);

	unregister_netdev(ndev);

	free_irq(IRQ_MAC_RX, ndev);

	free_netdev(ndev);

	setup_pin_mux(0);

	return 0;
}

1032 1033
#ifdef CONFIG_PM
static int bfin_mac_suspend(struct platform_device *pdev, pm_message_t mesg)
1034
{
1035 1036 1037 1038 1039
	struct net_device *net_dev = platform_get_drvdata(pdev);

	if (netif_running(net_dev))
		bf537mac_close(net_dev);

1040 1041 1042 1043 1044
	return 0;
}

static int bfin_mac_resume(struct platform_device *pdev)
{
1045 1046 1047 1048 1049
	struct net_device *net_dev = platform_get_drvdata(pdev);

	if (netif_running(net_dev))
		bf537mac_open(net_dev);

1050 1051
	return 0;
}
1052 1053 1054 1055
#else
#define bfin_mac_suspend NULL
#define bfin_mac_resume NULL
#endif	/* CONFIG_PM */
1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079

static struct platform_driver bfin_mac_driver = {
	.probe = bfin_mac_probe,
	.remove = bfin_mac_remove,
	.resume = bfin_mac_resume,
	.suspend = bfin_mac_suspend,
	.driver = {
		   .name = DRV_NAME,
		   },
};

static int __init bfin_mac_init(void)
{
	return platform_driver_register(&bfin_mac_driver);
}

module_init(bfin_mac_init);

static void __exit bfin_mac_cleanup(void)
{
	platform_driver_unregister(&bfin_mac_driver);
}

module_exit(bfin_mac_cleanup);