Merge branch 'for-linus' of git://git.infradead.org/users/sameo/mfd-2.6
[linux-btrfs-devel.git] / drivers / net / tulip / xircom_cb.c
blob988b8eb24d373c9e05107a80e312a7551f6ddff8
1 /*
2 * xircom_cb: A driver for the (tulip-like) Xircom Cardbus ethernet cards
4 * This software is (C) by the respective authors, and licensed under the GPL
5 * License.
7 * Written by Arjan van de Ven for Red Hat, Inc.
8 * Based on work by Jeff Garzik, Doug Ledford and Donald Becker
10 * This software may be used and distributed according to the terms
11 * of the GNU General Public License, incorporated herein by reference.
14 * $Id: xircom_cb.c,v 1.33 2001/03/19 14:02:07 arjanv Exp $
17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/string.h>
22 #include <linux/errno.h>
23 #include <linux/ioport.h>
24 #include <linux/slab.h>
25 #include <linux/interrupt.h>
26 #include <linux/pci.h>
27 #include <linux/netdevice.h>
28 #include <linux/etherdevice.h>
29 #include <linux/skbuff.h>
30 #include <linux/delay.h>
31 #include <linux/init.h>
32 #include <linux/bitops.h>
34 #include <asm/uaccess.h>
35 #include <asm/io.h>
36 #ifdef CONFIG_NET_POLL_CONTROLLER
37 #include <asm/irq.h>
38 #endif
40 MODULE_DESCRIPTION("Xircom Cardbus ethernet driver");
41 MODULE_AUTHOR("Arjan van de Ven <arjanv@redhat.com>");
42 MODULE_LICENSE("GPL");
46 /* IO registers on the card, offsets */
47 #define CSR0 0x00
48 #define CSR1 0x08
49 #define CSR2 0x10
50 #define CSR3 0x18
51 #define CSR4 0x20
52 #define CSR5 0x28
53 #define CSR6 0x30
54 #define CSR7 0x38
55 #define CSR8 0x40
56 #define CSR9 0x48
57 #define CSR10 0x50
58 #define CSR11 0x58
59 #define CSR12 0x60
60 #define CSR13 0x68
61 #define CSR14 0x70
62 #define CSR15 0x78
63 #define CSR16 0x80
65 /* PCI registers */
66 #define PCI_POWERMGMT 0x40
68 /* Offsets of the buffers within the descriptor pages, in bytes */
70 #define NUMDESCRIPTORS 4
72 static int bufferoffsets[NUMDESCRIPTORS] = {128,2048,4096,6144};
75 struct xircom_private {
76 /* Send and receive buffers, kernel-addressable and dma addressable forms */
78 __le32 *rx_buffer;
79 __le32 *tx_buffer;
81 dma_addr_t rx_dma_handle;
82 dma_addr_t tx_dma_handle;
84 struct sk_buff *tx_skb[4];
86 unsigned long io_port;
87 int open;
89 /* transmit_used is the rotating counter that indicates which transmit
90 descriptor has to be used next */
91 int transmit_used;
93 /* Spinlock to serialize register operations.
94 It must be helt while manipulating the following registers:
95 CSR0, CSR6, CSR7, CSR9, CSR10, CSR15
97 spinlock_t lock;
99 struct pci_dev *pdev;
100 struct net_device *dev;
104 /* Function prototypes */
105 static int xircom_probe(struct pci_dev *pdev, const struct pci_device_id *id);
106 static void xircom_remove(struct pci_dev *pdev);
107 static irqreturn_t xircom_interrupt(int irq, void *dev_instance);
108 static netdev_tx_t xircom_start_xmit(struct sk_buff *skb,
109 struct net_device *dev);
110 static int xircom_open(struct net_device *dev);
111 static int xircom_close(struct net_device *dev);
112 static void xircom_up(struct xircom_private *card);
113 #ifdef CONFIG_NET_POLL_CONTROLLER
114 static void xircom_poll_controller(struct net_device *dev);
115 #endif
117 static void investigate_read_descriptor(struct net_device *dev,struct xircom_private *card, int descnr, unsigned int bufferoffset);
118 static void investigate_write_descriptor(struct net_device *dev, struct xircom_private *card, int descnr, unsigned int bufferoffset);
119 static void read_mac_address(struct xircom_private *card);
120 static void transceiver_voodoo(struct xircom_private *card);
121 static void initialize_card(struct xircom_private *card);
122 static void trigger_transmit(struct xircom_private *card);
123 static void trigger_receive(struct xircom_private *card);
124 static void setup_descriptors(struct xircom_private *card);
125 static void remove_descriptors(struct xircom_private *card);
126 static int link_status_changed(struct xircom_private *card);
127 static void activate_receiver(struct xircom_private *card);
128 static void deactivate_receiver(struct xircom_private *card);
129 static void activate_transmitter(struct xircom_private *card);
130 static void deactivate_transmitter(struct xircom_private *card);
131 static void enable_transmit_interrupt(struct xircom_private *card);
132 static void enable_receive_interrupt(struct xircom_private *card);
133 static void enable_link_interrupt(struct xircom_private *card);
134 static void disable_all_interrupts(struct xircom_private *card);
135 static int link_status(struct xircom_private *card);
139 static DEFINE_PCI_DEVICE_TABLE(xircom_pci_table) = {
140 {0x115D, 0x0003, PCI_ANY_ID, PCI_ANY_ID,},
141 {0,},
143 MODULE_DEVICE_TABLE(pci, xircom_pci_table);
145 static struct pci_driver xircom_ops = {
146 .name = "xircom_cb",
147 .id_table = xircom_pci_table,
148 .probe = xircom_probe,
149 .remove = xircom_remove,
150 .suspend =NULL,
151 .resume =NULL
155 #if defined DEBUG && DEBUG > 1
156 static void print_binary(unsigned int number)
158 int i,i2;
159 char buffer[64];
160 memset(buffer,0,64);
161 i2=0;
162 for (i=31;i>=0;i--) {
163 if (number & (1<<i))
164 buffer[i2++]='1';
165 else
166 buffer[i2++]='0';
167 if ((i&3)==0)
168 buffer[i2++]=' ';
170 pr_debug("%s\n",buffer);
172 #endif
174 static const struct net_device_ops netdev_ops = {
175 .ndo_open = xircom_open,
176 .ndo_stop = xircom_close,
177 .ndo_start_xmit = xircom_start_xmit,
178 .ndo_change_mtu = eth_change_mtu,
179 .ndo_set_mac_address = eth_mac_addr,
180 .ndo_validate_addr = eth_validate_addr,
181 #ifdef CONFIG_NET_POLL_CONTROLLER
182 .ndo_poll_controller = xircom_poll_controller,
183 #endif
186 /* xircom_probe is the code that gets called on device insertion.
187 it sets up the hardware and registers the device to the networklayer.
189 TODO: Send 1 or 2 "dummy" packets here as the card seems to discard the
190 first two packets that get send, and pump hates that.
193 static int __devinit xircom_probe(struct pci_dev *pdev, const struct pci_device_id *id)
195 struct net_device *dev = NULL;
196 struct xircom_private *private;
197 unsigned long flags;
198 unsigned short tmp16;
200 /* First do the PCI initialisation */
202 if (pci_enable_device(pdev))
203 return -ENODEV;
205 /* disable all powermanagement */
206 pci_write_config_dword(pdev, PCI_POWERMGMT, 0x0000);
208 pci_set_master(pdev); /* Why isn't this done by pci_enable_device ?*/
210 /* clear PCI status, if any */
211 pci_read_config_word (pdev,PCI_STATUS, &tmp16);
212 pci_write_config_word (pdev, PCI_STATUS,tmp16);
214 if (!request_region(pci_resource_start(pdev, 0), 128, "xircom_cb")) {
215 pr_err("%s: failed to allocate io-region\n", __func__);
216 return -ENODEV;
220 Before changing the hardware, allocate the memory.
221 This way, we can fail gracefully if not enough memory
222 is available.
224 dev = alloc_etherdev(sizeof(struct xircom_private));
225 if (!dev) {
226 pr_err("%s: failed to allocate etherdev\n", __func__);
227 goto device_fail;
229 private = netdev_priv(dev);
231 /* Allocate the send/receive buffers */
232 private->rx_buffer = pci_alloc_consistent(pdev,8192,&private->rx_dma_handle);
233 if (private->rx_buffer == NULL) {
234 pr_err("%s: no memory for rx buffer\n", __func__);
235 goto rx_buf_fail;
237 private->tx_buffer = pci_alloc_consistent(pdev,8192,&private->tx_dma_handle);
238 if (private->tx_buffer == NULL) {
239 pr_err("%s: no memory for tx buffer\n", __func__);
240 goto tx_buf_fail;
243 SET_NETDEV_DEV(dev, &pdev->dev);
246 private->dev = dev;
247 private->pdev = pdev;
248 private->io_port = pci_resource_start(pdev, 0);
249 spin_lock_init(&private->lock);
250 dev->irq = pdev->irq;
251 dev->base_addr = private->io_port;
253 initialize_card(private);
254 read_mac_address(private);
255 setup_descriptors(private);
257 dev->netdev_ops = &netdev_ops;
258 pci_set_drvdata(pdev, dev);
260 if (register_netdev(dev)) {
261 pr_err("%s: netdevice registration failed\n", __func__);
262 goto reg_fail;
265 netdev_info(dev, "Xircom cardbus revision %i at irq %i\n",
266 pdev->revision, pdev->irq);
267 /* start the transmitter to get a heartbeat */
268 /* TODO: send 2 dummy packets here */
269 transceiver_voodoo(private);
271 spin_lock_irqsave(&private->lock,flags);
272 activate_transmitter(private);
273 activate_receiver(private);
274 spin_unlock_irqrestore(&private->lock,flags);
276 trigger_receive(private);
278 return 0;
280 reg_fail:
281 kfree(private->tx_buffer);
282 tx_buf_fail:
283 kfree(private->rx_buffer);
284 rx_buf_fail:
285 free_netdev(dev);
286 device_fail:
287 return -ENODEV;
292 xircom_remove is called on module-unload or on device-eject.
293 it unregisters the irq, io-region and network device.
294 Interrupts and such are already stopped in the "ifconfig ethX down"
295 code.
297 static void __devexit xircom_remove(struct pci_dev *pdev)
299 struct net_device *dev = pci_get_drvdata(pdev);
300 struct xircom_private *card = netdev_priv(dev);
302 pci_free_consistent(pdev,8192,card->rx_buffer,card->rx_dma_handle);
303 pci_free_consistent(pdev,8192,card->tx_buffer,card->tx_dma_handle);
305 release_region(dev->base_addr, 128);
306 unregister_netdev(dev);
307 free_netdev(dev);
308 pci_set_drvdata(pdev, NULL);
311 static irqreturn_t xircom_interrupt(int irq, void *dev_instance)
313 struct net_device *dev = (struct net_device *) dev_instance;
314 struct xircom_private *card = netdev_priv(dev);
315 unsigned int status;
316 int i;
318 spin_lock(&card->lock);
319 status = inl(card->io_port+CSR5);
321 #if defined DEBUG && DEBUG > 1
322 print_binary(status);
323 pr_debug("tx status 0x%08x 0x%08x\n",
324 card->tx_buffer[0], card->tx_buffer[4]);
325 pr_debug("rx status 0x%08x 0x%08x\n",
326 card->rx_buffer[0], card->rx_buffer[4]);
327 #endif
328 /* Handle shared irq and hotplug */
329 if (status == 0 || status == 0xffffffff) {
330 spin_unlock(&card->lock);
331 return IRQ_NONE;
334 if (link_status_changed(card)) {
335 int newlink;
336 netdev_dbg(dev, "Link status has changed\n");
337 newlink = link_status(card);
338 netdev_info(dev, "Link is %d mbit\n", newlink);
339 if (newlink)
340 netif_carrier_on(dev);
341 else
342 netif_carrier_off(dev);
346 /* Clear all remaining interrupts */
347 status |= 0xffffffff; /* FIXME: make this clear only the
348 real existing bits */
349 outl(status,card->io_port+CSR5);
352 for (i=0;i<NUMDESCRIPTORS;i++)
353 investigate_write_descriptor(dev,card,i,bufferoffsets[i]);
354 for (i=0;i<NUMDESCRIPTORS;i++)
355 investigate_read_descriptor(dev,card,i,bufferoffsets[i]);
357 spin_unlock(&card->lock);
358 return IRQ_HANDLED;
361 static netdev_tx_t xircom_start_xmit(struct sk_buff *skb,
362 struct net_device *dev)
364 struct xircom_private *card;
365 unsigned long flags;
366 int nextdescriptor;
367 int desc;
369 card = netdev_priv(dev);
370 spin_lock_irqsave(&card->lock,flags);
372 /* First see if we can free some descriptors */
373 for (desc=0;desc<NUMDESCRIPTORS;desc++)
374 investigate_write_descriptor(dev,card,desc,bufferoffsets[desc]);
377 nextdescriptor = (card->transmit_used +1) % (NUMDESCRIPTORS);
378 desc = card->transmit_used;
380 /* only send the packet if the descriptor is free */
381 if (card->tx_buffer[4*desc]==0) {
382 /* Copy the packet data; zero the memory first as the card
383 sometimes sends more than you ask it to. */
385 memset(&card->tx_buffer[bufferoffsets[desc]/4],0,1536);
386 skb_copy_from_linear_data(skb,
387 &(card->tx_buffer[bufferoffsets[desc] / 4]),
388 skb->len);
389 /* FIXME: The specification tells us that the length we send HAS to be a multiple of
390 4 bytes. */
392 card->tx_buffer[4*desc+1] = cpu_to_le32(skb->len);
393 if (desc == NUMDESCRIPTORS - 1) /* bit 25: last descriptor of the ring */
394 card->tx_buffer[4*desc+1] |= cpu_to_le32(1<<25);
396 card->tx_buffer[4*desc+1] |= cpu_to_le32(0xF0000000);
397 /* 0xF0... means want interrupts*/
398 card->tx_skb[desc] = skb;
400 wmb();
401 /* This gives the descriptor to the card */
402 card->tx_buffer[4*desc] = cpu_to_le32(0x80000000);
403 trigger_transmit(card);
404 if (card->tx_buffer[nextdescriptor*4] & cpu_to_le32(0x8000000)) {
405 /* next descriptor is occupied... */
406 netif_stop_queue(dev);
408 card->transmit_used = nextdescriptor;
409 spin_unlock_irqrestore(&card->lock,flags);
410 return NETDEV_TX_OK;
413 /* Uh oh... no free descriptor... drop the packet */
414 netif_stop_queue(dev);
415 spin_unlock_irqrestore(&card->lock,flags);
416 trigger_transmit(card);
418 return NETDEV_TX_BUSY;
424 static int xircom_open(struct net_device *dev)
426 struct xircom_private *xp = netdev_priv(dev);
427 int retval;
429 netdev_info(dev, "xircom cardbus adaptor found, using irq %i\n",
430 dev->irq);
431 retval = request_irq(dev->irq, xircom_interrupt, IRQF_SHARED, dev->name, dev);
432 if (retval)
433 return retval;
435 xircom_up(xp);
436 xp->open = 1;
438 return 0;
441 static int xircom_close(struct net_device *dev)
443 struct xircom_private *card;
444 unsigned long flags;
446 card = netdev_priv(dev);
447 netif_stop_queue(dev); /* we don't want new packets */
450 spin_lock_irqsave(&card->lock,flags);
452 disable_all_interrupts(card);
453 #if 0
454 /* We can enable this again once we send dummy packets on ifconfig ethX up */
455 deactivate_receiver(card);
456 deactivate_transmitter(card);
457 #endif
458 remove_descriptors(card);
460 spin_unlock_irqrestore(&card->lock,flags);
462 card->open = 0;
463 free_irq(dev->irq,dev);
465 return 0;
470 #ifdef CONFIG_NET_POLL_CONTROLLER
471 static void xircom_poll_controller(struct net_device *dev)
473 disable_irq(dev->irq);
474 xircom_interrupt(dev->irq, dev);
475 enable_irq(dev->irq);
477 #endif
480 static void initialize_card(struct xircom_private *card)
482 unsigned int val;
483 unsigned long flags;
485 spin_lock_irqsave(&card->lock, flags);
487 /* First: reset the card */
488 val = inl(card->io_port + CSR0);
489 val |= 0x01; /* Software reset */
490 outl(val, card->io_port + CSR0);
492 udelay(100); /* give the card some time to reset */
494 val = inl(card->io_port + CSR0);
495 val &= ~0x01; /* disable Software reset */
496 outl(val, card->io_port + CSR0);
499 val = 0; /* Value 0x00 is a safe and conservative value
500 for the PCI configuration settings */
501 outl(val, card->io_port + CSR0);
504 disable_all_interrupts(card);
505 deactivate_receiver(card);
506 deactivate_transmitter(card);
508 spin_unlock_irqrestore(&card->lock, flags);
512 trigger_transmit causes the card to check for frames to be transmitted.
513 This is accomplished by writing to the CSR1 port. The documentation
514 claims that the act of writing is sufficient and that the value is
515 ignored; I chose zero.
517 static void trigger_transmit(struct xircom_private *card)
519 unsigned int val;
521 val = 0;
522 outl(val, card->io_port + CSR1);
526 trigger_receive causes the card to check for empty frames in the
527 descriptor list in which packets can be received.
528 This is accomplished by writing to the CSR2 port. The documentation
529 claims that the act of writing is sufficient and that the value is
530 ignored; I chose zero.
532 static void trigger_receive(struct xircom_private *card)
534 unsigned int val;
536 val = 0;
537 outl(val, card->io_port + CSR2);
541 setup_descriptors initializes the send and receive buffers to be valid
542 descriptors and programs the addresses into the card.
544 static void setup_descriptors(struct xircom_private *card)
546 u32 address;
547 int i;
549 BUG_ON(card->rx_buffer == NULL);
550 BUG_ON(card->tx_buffer == NULL);
552 /* Receive descriptors */
553 memset(card->rx_buffer, 0, 128); /* clear the descriptors */
554 for (i=0;i<NUMDESCRIPTORS;i++ ) {
556 /* Rx Descr0: It's empty, let the card own it, no errors -> 0x80000000 */
557 card->rx_buffer[i*4 + 0] = cpu_to_le32(0x80000000);
558 /* Rx Descr1: buffer 1 is 1536 bytes, buffer 2 is 0 bytes */
559 card->rx_buffer[i*4 + 1] = cpu_to_le32(1536);
560 if (i == NUMDESCRIPTORS - 1) /* bit 25 is "last descriptor" */
561 card->rx_buffer[i*4 + 1] |= cpu_to_le32(1 << 25);
563 /* Rx Descr2: address of the buffer
564 we store the buffer at the 2nd half of the page */
566 address = card->rx_dma_handle;
567 card->rx_buffer[i*4 + 2] = cpu_to_le32(address + bufferoffsets[i]);
568 /* Rx Desc3: address of 2nd buffer -> 0 */
569 card->rx_buffer[i*4 + 3] = 0;
572 wmb();
573 /* Write the receive descriptor ring address to the card */
574 address = card->rx_dma_handle;
575 outl(address, card->io_port + CSR3); /* Receive descr list address */
578 /* transmit descriptors */
579 memset(card->tx_buffer, 0, 128); /* clear the descriptors */
581 for (i=0;i<NUMDESCRIPTORS;i++ ) {
582 /* Tx Descr0: Empty, we own it, no errors -> 0x00000000 */
583 card->tx_buffer[i*4 + 0] = 0x00000000;
584 /* Tx Descr1: buffer 1 is 1536 bytes, buffer 2 is 0 bytes */
585 card->tx_buffer[i*4 + 1] = cpu_to_le32(1536);
586 if (i == NUMDESCRIPTORS - 1) /* bit 25 is "last descriptor" */
587 card->tx_buffer[i*4 + 1] |= cpu_to_le32(1 << 25);
589 /* Tx Descr2: address of the buffer
590 we store the buffer at the 2nd half of the page */
591 address = card->tx_dma_handle;
592 card->tx_buffer[i*4 + 2] = cpu_to_le32(address + bufferoffsets[i]);
593 /* Tx Desc3: address of 2nd buffer -> 0 */
594 card->tx_buffer[i*4 + 3] = 0;
597 wmb();
598 /* wite the transmit descriptor ring to the card */
599 address = card->tx_dma_handle;
600 outl(address, card->io_port + CSR4); /* xmit descr list address */
604 remove_descriptors informs the card the descriptors are no longer
605 valid by setting the address in the card to 0x00.
607 static void remove_descriptors(struct xircom_private *card)
609 unsigned int val;
611 val = 0;
612 outl(val, card->io_port + CSR3); /* Receive descriptor address */
613 outl(val, card->io_port + CSR4); /* Send descriptor address */
617 link_status_changed returns 1 if the card has indicated that
618 the link status has changed. The new link status has to be read from CSR12.
620 This function also clears the status-bit.
622 static int link_status_changed(struct xircom_private *card)
624 unsigned int val;
626 val = inl(card->io_port + CSR5); /* Status register */
628 if ((val & (1 << 27)) == 0) /* no change */
629 return 0;
631 /* clear the event by writing a 1 to the bit in the
632 status register. */
633 val = (1 << 27);
634 outl(val, card->io_port + CSR5);
636 return 1;
641 transmit_active returns 1 if the transmitter on the card is
642 in a non-stopped state.
644 static int transmit_active(struct xircom_private *card)
646 unsigned int val;
648 val = inl(card->io_port + CSR5); /* Status register */
650 if ((val & (7 << 20)) == 0) /* transmitter disabled */
651 return 0;
653 return 1;
657 receive_active returns 1 if the receiver on the card is
658 in a non-stopped state.
660 static int receive_active(struct xircom_private *card)
662 unsigned int val;
664 val = inl(card->io_port + CSR5); /* Status register */
666 if ((val & (7 << 17)) == 0) /* receiver disabled */
667 return 0;
669 return 1;
673 activate_receiver enables the receiver on the card.
674 Before being allowed to active the receiver, the receiver
675 must be completely de-activated. To achieve this,
676 this code actually disables the receiver first; then it waits for the
677 receiver to become inactive, then it activates the receiver and then
678 it waits for the receiver to be active.
680 must be called with the lock held and interrupts disabled.
682 static void activate_receiver(struct xircom_private *card)
684 unsigned int val;
685 int counter;
687 val = inl(card->io_port + CSR6); /* Operation mode */
689 /* If the "active" bit is set and the receiver is already
690 active, no need to do the expensive thing */
691 if ((val&2) && (receive_active(card)))
692 return;
695 val = val & ~2; /* disable the receiver */
696 outl(val, card->io_port + CSR6);
698 counter = 10;
699 while (counter > 0) {
700 if (!receive_active(card))
701 break;
702 /* wait a while */
703 udelay(50);
704 counter--;
705 if (counter <= 0)
706 netdev_err(card->dev, "Receiver failed to deactivate\n");
709 /* enable the receiver */
710 val = inl(card->io_port + CSR6); /* Operation mode */
711 val = val | 2; /* enable the receiver */
712 outl(val, card->io_port + CSR6);
714 /* now wait for the card to activate again */
715 counter = 10;
716 while (counter > 0) {
717 if (receive_active(card))
718 break;
719 /* wait a while */
720 udelay(50);
721 counter--;
722 if (counter <= 0)
723 netdev_err(card->dev,
724 "Receiver failed to re-activate\n");
729 deactivate_receiver disables the receiver on the card.
730 To achieve this this code disables the receiver first;
731 then it waits for the receiver to become inactive.
733 must be called with the lock held and interrupts disabled.
735 static void deactivate_receiver(struct xircom_private *card)
737 unsigned int val;
738 int counter;
740 val = inl(card->io_port + CSR6); /* Operation mode */
741 val = val & ~2; /* disable the receiver */
742 outl(val, card->io_port + CSR6);
744 counter = 10;
745 while (counter > 0) {
746 if (!receive_active(card))
747 break;
748 /* wait a while */
749 udelay(50);
750 counter--;
751 if (counter <= 0)
752 netdev_err(card->dev, "Receiver failed to deactivate\n");
758 activate_transmitter enables the transmitter on the card.
759 Before being allowed to active the transmitter, the transmitter
760 must be completely de-activated. To achieve this,
761 this code actually disables the transmitter first; then it waits for the
762 transmitter to become inactive, then it activates the transmitter and then
763 it waits for the transmitter to be active again.
765 must be called with the lock held and interrupts disabled.
767 static void activate_transmitter(struct xircom_private *card)
769 unsigned int val;
770 int counter;
772 val = inl(card->io_port + CSR6); /* Operation mode */
774 /* If the "active" bit is set and the receiver is already
775 active, no need to do the expensive thing */
776 if ((val&(1<<13)) && (transmit_active(card)))
777 return;
779 val = val & ~(1 << 13); /* disable the transmitter */
780 outl(val, card->io_port + CSR6);
782 counter = 10;
783 while (counter > 0) {
784 if (!transmit_active(card))
785 break;
786 /* wait a while */
787 udelay(50);
788 counter--;
789 if (counter <= 0)
790 netdev_err(card->dev,
791 "Transmitter failed to deactivate\n");
794 /* enable the transmitter */
795 val = inl(card->io_port + CSR6); /* Operation mode */
796 val = val | (1 << 13); /* enable the transmitter */
797 outl(val, card->io_port + CSR6);
799 /* now wait for the card to activate again */
800 counter = 10;
801 while (counter > 0) {
802 if (transmit_active(card))
803 break;
804 /* wait a while */
805 udelay(50);
806 counter--;
807 if (counter <= 0)
808 netdev_err(card->dev,
809 "Transmitter failed to re-activate\n");
814 deactivate_transmitter disables the transmitter on the card.
815 To achieve this this code disables the transmitter first;
816 then it waits for the transmitter to become inactive.
818 must be called with the lock held and interrupts disabled.
820 static void deactivate_transmitter(struct xircom_private *card)
822 unsigned int val;
823 int counter;
825 val = inl(card->io_port + CSR6); /* Operation mode */
826 val = val & ~2; /* disable the transmitter */
827 outl(val, card->io_port + CSR6);
829 counter = 20;
830 while (counter > 0) {
831 if (!transmit_active(card))
832 break;
833 /* wait a while */
834 udelay(50);
835 counter--;
836 if (counter <= 0)
837 netdev_err(card->dev,
838 "Transmitter failed to deactivate\n");
844 enable_transmit_interrupt enables the transmit interrupt
846 must be called with the lock held and interrupts disabled.
848 static void enable_transmit_interrupt(struct xircom_private *card)
850 unsigned int val;
852 val = inl(card->io_port + CSR7); /* Interrupt enable register */
853 val |= 1; /* enable the transmit interrupt */
854 outl(val, card->io_port + CSR7);
859 enable_receive_interrupt enables the receive interrupt
861 must be called with the lock held and interrupts disabled.
863 static void enable_receive_interrupt(struct xircom_private *card)
865 unsigned int val;
867 val = inl(card->io_port + CSR7); /* Interrupt enable register */
868 val = val | (1 << 6); /* enable the receive interrupt */
869 outl(val, card->io_port + CSR7);
873 enable_link_interrupt enables the link status change interrupt
875 must be called with the lock held and interrupts disabled.
877 static void enable_link_interrupt(struct xircom_private *card)
879 unsigned int val;
881 val = inl(card->io_port + CSR7); /* Interrupt enable register */
882 val = val | (1 << 27); /* enable the link status chage interrupt */
883 outl(val, card->io_port + CSR7);
889 disable_all_interrupts disables all interrupts
891 must be called with the lock held and interrupts disabled.
893 static void disable_all_interrupts(struct xircom_private *card)
895 unsigned int val;
897 val = 0; /* disable all interrupts */
898 outl(val, card->io_port + CSR7);
902 enable_common_interrupts enables several weird interrupts
904 must be called with the lock held and interrupts disabled.
906 static void enable_common_interrupts(struct xircom_private *card)
908 unsigned int val;
910 val = inl(card->io_port + CSR7); /* Interrupt enable register */
911 val |= (1<<16); /* Normal Interrupt Summary */
912 val |= (1<<15); /* Abnormal Interrupt Summary */
913 val |= (1<<13); /* Fatal bus error */
914 val |= (1<<8); /* Receive Process Stopped */
915 val |= (1<<7); /* Receive Buffer Unavailable */
916 val |= (1<<5); /* Transmit Underflow */
917 val |= (1<<2); /* Transmit Buffer Unavailable */
918 val |= (1<<1); /* Transmit Process Stopped */
919 outl(val, card->io_port + CSR7);
923 enable_promisc starts promisc mode
925 must be called with the lock held and interrupts disabled.
927 static int enable_promisc(struct xircom_private *card)
929 unsigned int val;
931 val = inl(card->io_port + CSR6);
932 val = val | (1 << 6);
933 outl(val, card->io_port + CSR6);
935 return 1;
942 link_status() checks the links status and will return 0 for no link, 10 for 10mbit link and 100 for.. guess what.
944 Must be called in locked state with interrupts disabled
946 static int link_status(struct xircom_private *card)
948 unsigned int val;
950 val = inb(card->io_port + CSR12);
952 if (!(val&(1<<2))) /* bit 2 is 0 for 10mbit link, 1 for not an 10mbit link */
953 return 10;
954 if (!(val&(1<<1))) /* bit 1 is 0 for 100mbit link, 1 for not an 100mbit link */
955 return 100;
957 /* If we get here -> no link at all */
959 return 0;
967 read_mac_address() reads the MAC address from the NIC and stores it in the "dev" structure.
969 This function will take the spinlock itself and can, as a result, not be called with the lock helt.
971 static void read_mac_address(struct xircom_private *card)
973 unsigned char j, tuple, link, data_id, data_count;
974 unsigned long flags;
975 int i;
977 spin_lock_irqsave(&card->lock, flags);
979 outl(1 << 12, card->io_port + CSR9); /* enable boot rom access */
980 for (i = 0x100; i < 0x1f7; i += link + 2) {
981 outl(i, card->io_port + CSR10);
982 tuple = inl(card->io_port + CSR9) & 0xff;
983 outl(i + 1, card->io_port + CSR10);
984 link = inl(card->io_port + CSR9) & 0xff;
985 outl(i + 2, card->io_port + CSR10);
986 data_id = inl(card->io_port + CSR9) & 0xff;
987 outl(i + 3, card->io_port + CSR10);
988 data_count = inl(card->io_port + CSR9) & 0xff;
989 if ((tuple == 0x22) && (data_id == 0x04) && (data_count == 0x06)) {
991 * This is it. We have the data we want.
993 for (j = 0; j < 6; j++) {
994 outl(i + j + 4, card->io_port + CSR10);
995 card->dev->dev_addr[j] = inl(card->io_port + CSR9) & 0xff;
997 break;
998 } else if (link == 0) {
999 break;
1002 spin_unlock_irqrestore(&card->lock, flags);
1003 pr_debug(" %pM\n", card->dev->dev_addr);
1008 transceiver_voodoo() enables the external UTP plug thingy.
1009 it's called voodoo as I stole this code and cannot cross-reference
1010 it with the specification.
1012 static void transceiver_voodoo(struct xircom_private *card)
1014 unsigned long flags;
1016 /* disable all powermanagement */
1017 pci_write_config_dword(card->pdev, PCI_POWERMGMT, 0x0000);
1019 setup_descriptors(card);
1021 spin_lock_irqsave(&card->lock, flags);
1023 outl(0x0008, card->io_port + CSR15);
1024 udelay(25);
1025 outl(0xa8050000, card->io_port + CSR15);
1026 udelay(25);
1027 outl(0xa00f0000, card->io_port + CSR15);
1028 udelay(25);
1030 spin_unlock_irqrestore(&card->lock, flags);
1032 netif_start_queue(card->dev);
1036 static void xircom_up(struct xircom_private *card)
1038 unsigned long flags;
1039 int i;
1041 /* disable all powermanagement */
1042 pci_write_config_dword(card->pdev, PCI_POWERMGMT, 0x0000);
1044 setup_descriptors(card);
1046 spin_lock_irqsave(&card->lock, flags);
1049 enable_link_interrupt(card);
1050 enable_transmit_interrupt(card);
1051 enable_receive_interrupt(card);
1052 enable_common_interrupts(card);
1053 enable_promisc(card);
1055 /* The card can have received packets already, read them away now */
1056 for (i=0;i<NUMDESCRIPTORS;i++)
1057 investigate_read_descriptor(card->dev,card,i,bufferoffsets[i]);
1060 spin_unlock_irqrestore(&card->lock, flags);
1061 trigger_receive(card);
1062 trigger_transmit(card);
1063 netif_start_queue(card->dev);
1066 /* Bufferoffset is in BYTES */
1067 static void
1068 investigate_read_descriptor(struct net_device *dev, struct xircom_private *card,
1069 int descnr, unsigned int bufferoffset)
1071 int status;
1073 status = le32_to_cpu(card->rx_buffer[4*descnr]);
1075 if (status > 0) { /* packet received */
1077 /* TODO: discard error packets */
1079 short pkt_len = ((status >> 16) & 0x7ff) - 4;
1080 /* minus 4, we don't want the CRC */
1081 struct sk_buff *skb;
1083 if (pkt_len > 1518) {
1084 netdev_err(dev, "Packet length %i is bogus\n", pkt_len);
1085 pkt_len = 1518;
1088 skb = dev_alloc_skb(pkt_len + 2);
1089 if (skb == NULL) {
1090 dev->stats.rx_dropped++;
1091 goto out;
1093 skb_reserve(skb, 2);
1094 skb_copy_to_linear_data(skb,
1095 &card->rx_buffer[bufferoffset / 4],
1096 pkt_len);
1097 skb_put(skb, pkt_len);
1098 skb->protocol = eth_type_trans(skb, dev);
1099 netif_rx(skb);
1100 dev->stats.rx_packets++;
1101 dev->stats.rx_bytes += pkt_len;
1103 out:
1104 /* give the buffer back to the card */
1105 card->rx_buffer[4*descnr] = cpu_to_le32(0x80000000);
1106 trigger_receive(card);
1111 /* Bufferoffset is in BYTES */
1112 static void
1113 investigate_write_descriptor(struct net_device *dev,
1114 struct xircom_private *card,
1115 int descnr, unsigned int bufferoffset)
1117 int status;
1119 status = le32_to_cpu(card->tx_buffer[4*descnr]);
1120 #if 0
1121 if (status & 0x8000) { /* Major error */
1122 pr_err("Major transmit error status %x\n", status);
1123 card->tx_buffer[4*descnr] = 0;
1124 netif_wake_queue (dev);
1126 #endif
1127 if (status > 0) { /* bit 31 is 0 when done */
1128 if (card->tx_skb[descnr]!=NULL) {
1129 dev->stats.tx_bytes += card->tx_skb[descnr]->len;
1130 dev_kfree_skb_irq(card->tx_skb[descnr]);
1132 card->tx_skb[descnr] = NULL;
1133 /* Bit 8 in the status field is 1 if there was a collision */
1134 if (status & (1 << 8))
1135 dev->stats.collisions++;
1136 card->tx_buffer[4*descnr] = 0; /* descriptor is free again */
1137 netif_wake_queue (dev);
1138 dev->stats.tx_packets++;
1142 static int __init xircom_init(void)
1144 return pci_register_driver(&xircom_ops);
1147 static void __exit xircom_exit(void)
1149 pci_unregister_driver(&xircom_ops);
1152 module_init(xircom_init)
1153 module_exit(xircom_exit)