sk_mca.c
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上传日期:2013-02-24
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- /*
- net-3-driver for the SKNET MCA-based cards
- This is an extension to the Linux operating system, and is covered by the
- same GNU General Public License that covers that work.
- Copyright 1999 by Alfred Arnold (alfred@ccac.rwth-aachen.de, aarnold@elsa.de)
- This driver is based both on the 3C523 driver and the SK_G16 driver.
- paper sources:
- 'PC Hardware: Aufbau, Funktionsweise, Programmierung' by
- Hans-Peter Messmer for the basic Microchannel stuff
-
- 'Linux Geraetetreiber' by Allesandro Rubini, Kalle Dalheimer
- for help on Ethernet driver programming
- 'Ethernet/IEEE 802.3 Family 1992 World Network Data Book/Handbook' by AMD
- for documentation on the AM7990 LANCE
- 'SKNET Personal Technisches Manual', Version 1.2 by Schneider&Koch
- for documentation on the Junior board
- 'SK-NET MC2+ Technical Manual", Version 1.1 by Schneider&Koch for
- documentation on the MC2 bord
-
- A big thank you to the S&K support for providing me so quickly with
- documentation!
- Also see http://www.syskonnect.com/
- Missing things:
- -> set debug level via ioctl instead of compile-time switches
- -> I didn't follow the development of the 2.1.x kernels, so my
- assumptions about which things changed with which kernel version
- are probably nonsense
- History:
- May 16th, 1999
- startup
- May 22st, 1999
- added private structure, methods
- begun building data structures in RAM
- May 23nd, 1999
- can receive frames, send frames
- May 24th, 1999
- modularized intialization of LANCE
- loadable as module
- still Tx problem :-(
- May 26th, 1999
- MC2 works
- support for multiple devices
- display media type for MC2+
- May 28th, 1999
- fixed problem in GetLANCE leaving interrupts turned off
- increase TX queue to 4 packets to improve send performance
- May 29th, 1999
- a few corrections in statistics, caught rcvr overruns
- reinitialization of LANCE/board in critical situations
- MCA info implemented
- implemented LANCE multicast filter
- Jun 6th, 1999
- additions for Linux 2.2
- Dec 25th, 1999
- unfortunately there seem to be newer MC2+ boards that react
- on IRQ 3/5/9/10 instead of 3/5/10/11, so we have to autoprobe
- in questionable cases...
- Dec 28th, 1999
- integrated patches from David Weinehall & Bill Wendling for 2.3
- kernels (isa_...functions). Things are defined in a way that
- it still works with 2.0.x 8-)
- Dec 30th, 1999
- added handling of the remaining interrupt conditions. That
- should cure the spurious hangs.
- Jan 30th, 2000
- newer kernels automatically probe more than one board, so the
- 'startslot' as a variable is also needed here
- June 1st, 2000
- added changes for recent 2.3 kernels
- *************************************************************************/
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/string.h>
- #include <linux/errno.h>
- #include <linux/ioport.h>
- #include <linux/slab.h>
- #include <linux/interrupt.h>
- #include <linux/delay.h>
- #include <linux/time.h>
- #include <linux/mca.h>
- #include <linux/init.h>
- #include <asm/processor.h>
- #include <asm/bitops.h>
- #include <asm/io.h>
- #include <linux/module.h>
- #include <linux/version.h>
- #include <linux/netdevice.h>
- #include <linux/etherdevice.h>
- #include <linux/skbuff.h>
- #define _SK_MCA_DRIVER_
- #include "sk_mca.h"
- /* ------------------------------------------------------------------------
- * global static data - not more since we can handle multiple boards and
- * have to pack all state info into the device struct!
- * ------------------------------------------------------------------------ */
- static char *MediaNames[Media_Count] =
- { "10Base2", "10BaseT", "10Base5", "Unknown" };
- static unsigned char poly[] =
- { 1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 0, 0, 0,
- 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0
- };
- /* ------------------------------------------------------------------------
- * private subfunctions
- * ------------------------------------------------------------------------ */
- /* dump parts of shared memory - only needed during debugging */
- #ifdef DEBUG
- static void dumpmem(struct SKMCA_NETDEV *dev, u32 start, u32 len)
- {
- int z;
- for (z = 0; z < len; z++) {
- if ((z & 15) == 0)
- printk("%04x:", z);
- printk(" %02x", SKMCA_READB(dev->mem_start + start + z));
- if ((z & 15) == 15)
- printk("n");
- }
- }
- /* print exact time - ditto */
- static void PrTime(void)
- {
- struct timeval tv;
- do_gettimeofday(&tv);
- printk("%9d:%06d: ", tv.tv_sec, tv.tv_usec);
- }
- #endif
- /* deduce resources out of POS registers */
- static void __init getaddrs(int slot, int junior, int *base, int *irq,
- skmca_medium * medium)
- {
- u_char pos0, pos1, pos2;
- if (junior) {
- pos0 = mca_read_stored_pos(slot, 2);
- *base = ((pos0 & 0x0e) << 13) + 0xc0000;
- *irq = ((pos0 & 0x10) >> 4) + 10;
- *medium = Media_Unknown;
- } else {
- /* reset POS 104 Bits 0+1 so the shared memory region goes to the
- configured area between 640K and 1M. Afterwards, enable the MC2.
- I really don't know what rode SK to do this... */
- mca_write_pos(slot, 4,
- mca_read_stored_pos(slot, 4) & 0xfc);
- mca_write_pos(slot, 2,
- mca_read_stored_pos(slot, 2) | 0x01);
- pos1 = mca_read_stored_pos(slot, 3);
- pos2 = mca_read_stored_pos(slot, 4);
- *base = ((pos1 & 0x07) << 14) + 0xc0000;
- switch (pos2 & 0x0c) {
- case 0:
- *irq = 3;
- break;
- case 4:
- *irq = 5;
- break;
- case 8:
- *irq = -10;
- break;
- case 12:
- *irq = -11;
- break;
- }
- *medium = (pos2 >> 6) & 3;
- }
- }
- /* check for both cards:
- When the MC2 is turned off, it was configured for more than 15MB RAM,
- is disabled and won't get detected using the standard probe. We
- therefore have to scan the slots manually :-( */
- static int __init dofind(int *junior, int firstslot)
- {
- int slot;
- unsigned int id;
- for (slot = firstslot; slot < MCA_MAX_SLOT_NR; slot++) {
- id = mca_read_stored_pos(slot, 0)
- + (((unsigned int) mca_read_stored_pos(slot, 1)) << 8);
- *junior = 0;
- if (id == SKNET_MCA_ID)
- return slot;
- *junior = 1;
- if (id == SKNET_JUNIOR_MCA_ID)
- return slot;
- }
- return MCA_NOTFOUND;
- }
- /* reset the whole board */
- static void ResetBoard(struct SKMCA_NETDEV *dev)
- {
- skmca_priv *priv = (skmca_priv *) dev->priv;
- SKMCA_WRITEB(CTRL_RESET_ON, priv->ctrladdr);
- udelay(10);
- SKMCA_WRITEB(CTRL_RESET_OFF, priv->ctrladdr);
- }
- /* wait for LANCE interface to become not busy */
- static int WaitLANCE(struct SKMCA_NETDEV *dev)
- {
- skmca_priv *priv = (skmca_priv *) dev->priv;
- int t = 0;
- while ((SKMCA_READB(priv->ctrladdr) & STAT_IO_BUSY) ==
- STAT_IO_BUSY) {
- udelay(1);
- if (++t > 1000) {
- printk("%s: LANCE access timeout", dev->name);
- return 0;
- }
- }
- return 1;
- }
- /* set LANCE register - must be atomic */
- static void SetLANCE(struct SKMCA_NETDEV *dev, u16 addr, u16 value)
- {
- skmca_priv *priv = (skmca_priv *) dev->priv;
- unsigned long flags;
- /* disable interrupts */
- save_flags(flags);
- cli();
- /* wait until no transfer is pending */
- WaitLANCE(dev);
- /* transfer register address to RAP */
- SKMCA_WRITEB(CTRL_RESET_OFF | CTRL_RW_WRITE | CTRL_ADR_RAP,
- priv->ctrladdr);
- SKMCA_WRITEW(addr, priv->ioregaddr);
- SKMCA_WRITEB(IOCMD_GO, priv->cmdaddr);
- udelay(1);
- WaitLANCE(dev);
- /* transfer data to register */
- SKMCA_WRITEB(CTRL_RESET_OFF | CTRL_RW_WRITE | CTRL_ADR_DATA,
- priv->ctrladdr);
- SKMCA_WRITEW(value, priv->ioregaddr);
- SKMCA_WRITEB(IOCMD_GO, priv->cmdaddr);
- udelay(1);
- WaitLANCE(dev);
- /* reenable interrupts */
- restore_flags(flags);
- }
- /* get LANCE register */
- static u16 GetLANCE(struct SKMCA_NETDEV *dev, u16 addr)
- {
- skmca_priv *priv = (skmca_priv *) dev->priv;
- unsigned long flags;
- unsigned int res;
- /* disable interrupts */
- save_flags(flags);
- cli();
- /* wait until no transfer is pending */
- WaitLANCE(dev);
- /* transfer register address to RAP */
- SKMCA_WRITEB(CTRL_RESET_OFF | CTRL_RW_WRITE | CTRL_ADR_RAP,
- priv->ctrladdr);
- SKMCA_WRITEW(addr, priv->ioregaddr);
- SKMCA_WRITEB(IOCMD_GO, priv->cmdaddr);
- udelay(1);
- WaitLANCE(dev);
- /* transfer data from register */
- SKMCA_WRITEB(CTRL_RESET_OFF | CTRL_RW_READ | CTRL_ADR_DATA,
- priv->ctrladdr);
- SKMCA_WRITEB(IOCMD_GO, priv->cmdaddr);
- udelay(1);
- WaitLANCE(dev);
- res = SKMCA_READW(priv->ioregaddr);
- /* reenable interrupts */
- restore_flags(flags);
- return res;
- }
- /* build up descriptors in shared RAM */
- static void InitDscrs(struct SKMCA_NETDEV *dev)
- {
- u32 bufaddr;
- /* Set up Tx descriptors. The board has only 16K RAM so bits 16..23
- are always 0. */
- bufaddr = RAM_DATABASE;
- {
- LANCE_TxDescr descr;
- int z;
- for (z = 0; z < TXCOUNT; z++) {
- descr.LowAddr = bufaddr;
- descr.Flags = 0;
- descr.Len = 0xf000;
- descr.Status = 0;
- SKMCA_TOIO(dev->mem_start + RAM_TXBASE +
- (z * sizeof(LANCE_TxDescr)), &descr,
- sizeof(LANCE_TxDescr));
- SKMCA_SETIO(dev->mem_start + bufaddr, 0,
- RAM_BUFSIZE);
- bufaddr += RAM_BUFSIZE;
- }
- }
- /* do the same for the Rx descriptors */
- {
- LANCE_RxDescr descr;
- int z;
- for (z = 0; z < RXCOUNT; z++) {
- descr.LowAddr = bufaddr;
- descr.Flags = RXDSCR_FLAGS_OWN;
- descr.MaxLen = -RAM_BUFSIZE;
- descr.Len = 0;
- SKMCA_TOIO(dev->mem_start + RAM_RXBASE +
- (z * sizeof(LANCE_RxDescr)), &descr,
- sizeof(LANCE_RxDescr));
- SKMCA_SETIO(dev->mem_start + bufaddr, 0,
- RAM_BUFSIZE);
- bufaddr += RAM_BUFSIZE;
- }
- }
- }
- /* calculate the hash bit position for a given multicast address
- taken more or less directly from the AMD datasheet... */
- static void UpdateCRC(unsigned char *CRC, int bit)
- {
- int j;
- /* shift CRC one bit */
- memmove(CRC + 1, CRC, 32 * sizeof(unsigned char));
- CRC[0] = 0;
- /* if bit XOR controlbit = 1, set CRC = CRC XOR polynomial */
- if (bit ^ CRC[32])
- for (j = 0; j < 32; j++)
- CRC[j] ^= poly[j];
- }
- static unsigned int GetHash(char *address)
- {
- unsigned char CRC[33];
- int i, byte, hashcode;
- /* a multicast address has bit 0 in the first byte set */
- if ((address[0] & 1) == 0)
- return -1;
- /* initialize CRC */
- memset(CRC, 1, sizeof(CRC));
- /* loop through address bits */
- for (byte = 0; byte < 6; byte++)
- for (i = 0; i < 8; i++)
- UpdateCRC(CRC, (address[byte] >> i) & 1);
- /* hashcode is the 6 least significant bits of the CRC */
- hashcode = 0;
- for (i = 0; i < 6; i++)
- hashcode = (hashcode << 1) + CRC[i];
- return hashcode;
- }
- /* feed ready-built initialization block into LANCE */
- static void InitLANCE(struct SKMCA_NETDEV *dev)
- {
- skmca_priv *priv = (skmca_priv *) dev->priv;
- /* build up descriptors. */
- InitDscrs(dev);
- /* next RX descriptor to be read is the first one. Since the LANCE
- will start from the beginning after initialization, we have to
- reset out pointers too. */
- priv->nextrx = 0;
- /* no TX descriptors active */
- priv->nexttxput = priv->nexttxdone = priv->txbusy = 0;
- /* set up the LANCE bus control register - constant for SKnet boards */
- SetLANCE(dev, LANCE_CSR3,
- CSR3_BSWAP_OFF | CSR3_ALE_LOW | CSR3_BCON_HOLD);
- /* write address of initialization block into LANCE */
- SetLANCE(dev, LANCE_CSR1, RAM_INITBASE & 0xffff);
- SetLANCE(dev, LANCE_CSR2, (RAM_INITBASE >> 16) & 0xff);
- /* we don't get ready until the LANCE has read the init block */
- #if (LINUX_VERSION_CODE >= 0x02032a)
- netif_stop_queue(dev);
- #else
- dev->tbusy = 1;
- #endif
- /* let LANCE read the initialization block. LANCE is ready
- when we receive the corresponding interrupt. */
- SetLANCE(dev, LANCE_CSR0, CSR0_INEA | CSR0_INIT);
- }
- /* stop the LANCE so we can reinitialize it */
- static void StopLANCE(struct SKMCA_NETDEV *dev)
- {
- /* can't take frames any more */
- #if (LINUX_VERSION_CODE >= 0x02032a)
- netif_stop_queue(dev);
- #else
- dev->tbusy = 1;
- #endif
- /* disable interrupts, stop it */
- SetLANCE(dev, LANCE_CSR0, CSR0_STOP);
- }
- /* initialize card and LANCE for proper operation */
- static void InitBoard(struct SKMCA_NETDEV *dev)
- {
- LANCE_InitBlock block;
- /* Lay out the shared RAM - first we create the init block for the LANCE.
- We do not overwrite it later because we need it again when we switch
- promiscous mode on/off. */
- block.Mode = 0;
- if (dev->flags & IFF_PROMISC)
- block.Mode |= LANCE_INIT_PROM;
- memcpy(block.PAdr, dev->dev_addr, 6);
- memset(block.LAdrF, 0, sizeof(block.LAdrF));
- block.RdrP = (RAM_RXBASE & 0xffffff) | (LRXCOUNT << 29);
- block.TdrP = (RAM_TXBASE & 0xffffff) | (LTXCOUNT << 29);
- SKMCA_TOIO(dev->mem_start + RAM_INITBASE, &block, sizeof(block));
- /* initialize LANCE. Implicitly sets up other structures in RAM. */
- InitLANCE(dev);
- }
- /* deinitialize card and LANCE */
- static void DeinitBoard(struct SKMCA_NETDEV *dev)
- {
- /* stop LANCE */
- StopLANCE(dev);
- /* reset board */
- ResetBoard(dev);
- }
- /* probe for device's irq */
- static int __init ProbeIRQ(struct SKMCA_NETDEV *dev)
- {
- unsigned long imaskval, njiffies, irq;
- u16 csr0val;
- /* enable all interrupts */
- imaskval = probe_irq_on();
- /* initialize the board. Wait for interrupt 'Initialization done'. */
- ResetBoard(dev);
- InitBoard(dev);
- njiffies = jiffies + 100;
- do {
- csr0val = GetLANCE(dev, LANCE_CSR0);
- }
- while (((csr0val & CSR0_IDON) == 0) && (jiffies != njiffies));
- /* turn of interrupts again */
- irq = probe_irq_off(imaskval);
- /* if we found something, ack the interrupt */
- if (irq)
- SetLANCE(dev, LANCE_CSR0, csr0val | CSR0_IDON);
- /* back to idle state */
- DeinitBoard(dev);
- return irq;
- }
- /* ------------------------------------------------------------------------
- * interrupt handler(s)
- * ------------------------------------------------------------------------ */
- /* LANCE has read initialization block -> start it */
- static u16 irqstart_handler(struct SKMCA_NETDEV *dev, u16 oldcsr0)
- {
- /* now we're ready to transmit */
- #if (LINUX_VERSION_CODE >= 0x02032a)
- netif_wake_queue(dev);
- #else
- dev->tbusy = 0;
- #endif
- /* reset IDON bit, start LANCE */
- SetLANCE(dev, LANCE_CSR0, oldcsr0 | CSR0_IDON | CSR0_STRT);
- return GetLANCE(dev, LANCE_CSR0);
- }
- /* did we loose blocks due to a FIFO overrun ? */
- static u16 irqmiss_handler(struct SKMCA_NETDEV *dev, u16 oldcsr0)
- {
- skmca_priv *priv = (skmca_priv *) dev->priv;
- /* update statistics */
- priv->stat.rx_fifo_errors++;
- /* reset MISS bit */
- SetLANCE(dev, LANCE_CSR0, oldcsr0 | CSR0_MISS);
- return GetLANCE(dev, LANCE_CSR0);
- }
- /* receive interrupt */
- static u16 irqrx_handler(struct SKMCA_NETDEV *dev, u16 oldcsr0)
- {
- skmca_priv *priv = (skmca_priv *) dev->priv;
- LANCE_RxDescr descr;
- unsigned int descraddr;
- /* run through queue until we reach a descriptor we do not own */
- descraddr = RAM_RXBASE + (priv->nextrx * sizeof(LANCE_RxDescr));
- while (1) {
- /* read descriptor */
- SKMCA_FROMIO(&descr, dev->mem_start + descraddr,
- sizeof(LANCE_RxDescr));
- /* if we reach a descriptor we do not own, we're done */
- if ((descr.Flags & RXDSCR_FLAGS_OWN) != 0)
- break;
- #ifdef DEBUG
- PrTime();
- printk("Receive packet on descr %d len %dn", priv->nextrx,
- descr.Len);
- #endif
- /* erroneous packet ? */
- if ((descr.Flags & RXDSCR_FLAGS_ERR) != 0) {
- priv->stat.rx_errors++;
- if ((descr.Flags & RXDSCR_FLAGS_CRC) != 0)
- priv->stat.rx_crc_errors++;
- else if ((descr.Flags & RXDSCR_FLAGS_CRC) != 0)
- priv->stat.rx_frame_errors++;
- else if ((descr.Flags & RXDSCR_FLAGS_OFLO) != 0)
- priv->stat.rx_fifo_errors++;
- }
- /* good packet ? */
- else {
- struct sk_buff *skb;
- skb = dev_alloc_skb(descr.Len + 2);
- if (skb == NULL)
- priv->stat.rx_dropped++;
- else {
- SKMCA_FROMIO(skb_put(skb, descr.Len),
- dev->mem_start +
- descr.LowAddr, descr.Len);
- skb->dev = dev;
- skb->protocol = eth_type_trans(skb, dev);
- skb->ip_summed = CHECKSUM_NONE;
- priv->stat.rx_packets++;
- #if LINUX_VERSION_CODE >= 0x020119 /* byte counters for >= 2.1.25 */
- priv->stat.rx_bytes += descr.Len;
- #endif
- netif_rx(skb);
- dev->last_rx = jiffies;
- }
- }
- /* give descriptor back to LANCE */
- descr.Len = 0;
- descr.Flags |= RXDSCR_FLAGS_OWN;
- /* update descriptor in shared RAM */
- SKMCA_TOIO(dev->mem_start + descraddr, &descr,
- sizeof(LANCE_RxDescr));
- /* go to next descriptor */
- priv->nextrx++;
- descraddr += sizeof(LANCE_RxDescr);
- if (priv->nextrx >= RXCOUNT) {
- priv->nextrx = 0;
- descraddr = RAM_RXBASE;
- }
- }
- /* reset RINT bit */
- SetLANCE(dev, LANCE_CSR0, oldcsr0 | CSR0_RINT);
- return GetLANCE(dev, LANCE_CSR0);
- }
- /* transmit interrupt */
- static u16 irqtx_handler(struct SKMCA_NETDEV *dev, u16 oldcsr0)
- {
- skmca_priv *priv = (skmca_priv *) dev->priv;
- LANCE_TxDescr descr;
- unsigned int descraddr;
- /* check descriptors at most until no busy one is left */
- descraddr =
- RAM_TXBASE + (priv->nexttxdone * sizeof(LANCE_TxDescr));
- while (priv->txbusy > 0) {
- /* read descriptor */
- SKMCA_FROMIO(&descr, dev->mem_start + descraddr,
- sizeof(LANCE_TxDescr));
- /* if the LANCE still owns this one, we've worked out all sent packets */
- if ((descr.Flags & TXDSCR_FLAGS_OWN) != 0)
- break;
- #ifdef DEBUG
- PrTime();
- printk("Send packet done on descr %dn", priv->nexttxdone);
- #endif
- /* update statistics */
- if ((descr.Flags & TXDSCR_FLAGS_ERR) == 0) {
- priv->stat.tx_packets++;
- #if LINUX_VERSION_CODE >= 0x020119 /* byte counters for >= 2.1.25 */
- priv->stat.tx_bytes++;
- #endif
- } else {
- priv->stat.tx_errors++;
- if ((descr.Status & TXDSCR_STATUS_UFLO) != 0) {
- priv->stat.tx_fifo_errors++;
- InitLANCE(dev);
- }
- else
- if ((descr.Status & TXDSCR_STATUS_LCOL) !=
- 0) priv->stat.tx_window_errors++;
- else if ((descr.Status & TXDSCR_STATUS_LCAR) != 0)
- priv->stat.tx_carrier_errors++;
- else if ((descr.Status & TXDSCR_STATUS_RTRY) != 0)
- priv->stat.tx_aborted_errors++;
- }
- /* go to next descriptor */
- priv->nexttxdone++;
- descraddr += sizeof(LANCE_TxDescr);
- if (priv->nexttxdone >= TXCOUNT) {
- priv->nexttxdone = 0;
- descraddr = RAM_TXBASE;
- }
- priv->txbusy--;
- }
- /* reset TX interrupt bit */
- SetLANCE(dev, LANCE_CSR0, oldcsr0 | CSR0_TINT);
- oldcsr0 = GetLANCE(dev, LANCE_CSR0);
- /* at least one descriptor is freed. Therefore we can accept
- a new one */
- /* inform upper layers we're in business again */
- #if (LINUX_VERSION_CODE >= 0x02032a)
- netif_wake_queue(dev);
- #else
- dev->tbusy = 0;
- mark_bh(NET_BH);
- #endif
- return oldcsr0;
- }
- /* general interrupt entry */
- static void irq_handler(int irq, void *device, struct pt_regs *regs)
- {
- struct SKMCA_NETDEV *dev = (struct SKMCA_NETDEV *) device;
- u16 csr0val;
- /* read CSR0 to get interrupt cause */
- csr0val = GetLANCE(dev, LANCE_CSR0);
- /* in case we're not meant... */
- if ((csr0val & CSR0_INTR) == 0)
- return;
- #if (LINUX_VERSION_CODE >= 0x02032a)
- #if 0
- set_bit(LINK_STATE_RXSEM, &dev->state);
- #endif
- #else
- dev->interrupt = 1;
- #endif
- /* loop through the interrupt bits until everything is clear */
- do {
- if ((csr0val & CSR0_IDON) != 0)
- csr0val = irqstart_handler(dev, csr0val);
- if ((csr0val & CSR0_RINT) != 0)
- csr0val = irqrx_handler(dev, csr0val);
- if ((csr0val & CSR0_MISS) != 0)
- csr0val = irqmiss_handler(dev, csr0val);
- if ((csr0val & CSR0_TINT) != 0)
- csr0val = irqtx_handler(dev, csr0val);
- if ((csr0val & CSR0_MERR) != 0) {
- SetLANCE(dev, LANCE_CSR0, csr0val | CSR0_MERR);
- csr0val = GetLANCE(dev, LANCE_CSR0);
- }
- if ((csr0val & CSR0_BABL) != 0) {
- SetLANCE(dev, LANCE_CSR0, csr0val | CSR0_BABL);
- csr0val = GetLANCE(dev, LANCE_CSR0);
- }
- }
- while ((csr0val & CSR0_INTR) != 0);
- #if (LINUX_VERSION_CODE >= 0x02032a)
- #if 0
- clear_bit(LINK_STATE_RXSEM, &dev->state);
- #endif
- #else
- dev->interrupt = 0;
- #endif
- }
- /* ------------------------------------------------------------------------
- * driver methods
- * ------------------------------------------------------------------------ */
- /* MCA info */
- static int skmca_getinfo(char *buf, int slot, void *d)
- {
- int len = 0, i;
- struct SKMCA_NETDEV *dev = (struct SKMCA_NETDEV *) d;
- skmca_priv *priv;
- /* can't say anything about an uninitialized device... */
- if (dev == NULL)
- return len;
- if (dev->priv == NULL)
- return len;
- priv = (skmca_priv *) dev->priv;
- /* print info */
- len += sprintf(buf + len, "IRQ: %dn", priv->realirq);
- len += sprintf(buf + len, "Memory: %#lx-%#lxn", dev->mem_start,
- dev->mem_end - 1);
- len +=
- sprintf(buf + len, "Transceiver: %sn",
- MediaNames[priv->medium]);
- len += sprintf(buf + len, "Device: %sn", dev->name);
- len += sprintf(buf + len, "MAC address:");
- for (i = 0; i < 6; i++)
- len += sprintf(buf + len, " %02x", dev->dev_addr[i]);
- buf[len++] = 'n';
- buf[len] = 0;
- return len;
- }
- /* open driver. Means also initialization and start of LANCE */
- static int skmca_open(struct SKMCA_NETDEV *dev)
- {
- int result;
- skmca_priv *priv = (skmca_priv *) dev->priv;
- /* register resources - only necessary for IRQ */
- result =
- request_irq(priv->realirq, irq_handler,
- SA_SHIRQ | SA_SAMPLE_RANDOM, "sk_mca", dev);
- if (result != 0) {
- printk("%s: failed to register irq %dn", dev->name,
- dev->irq);
- return result;
- }
- dev->irq = priv->realirq;
- /* set up the card and LANCE */
- InitBoard(dev);
- /* set up flags */
- #if (LINUX_VERSION_CODE >= 0x02032a)
- netif_start_queue(dev);
- #else
- dev->interrupt = 0;
- dev->tbusy = 0;
- dev->start = 0;
- MOD_INC_USE_COUNT;
- #endif
- return 0;
- }
- /* close driver. Shut down board and free allocated resources */
- static int skmca_close(struct SKMCA_NETDEV *dev)
- {
- /* turn off board */
- DeinitBoard(dev);
- /* release resources */
- if (dev->irq != 0)
- free_irq(dev->irq, dev);
- dev->irq = 0;
- #if (LINUX_VERSION_CODE < 0x02032a)
- MOD_DEC_USE_COUNT;
- #endif
- return 0;
- }
- /* transmit a block. */
- static int skmca_tx(struct sk_buff *skb, struct SKMCA_NETDEV *dev)
- {
- skmca_priv *priv = (skmca_priv *) dev->priv;
- LANCE_TxDescr descr;
- unsigned int address;
- int tmplen, retval = 0;
- unsigned long flags;
- /* if we get called with a NULL descriptor, the Ethernet layer thinks
- our card is stuck an we should reset it. We'll do this completely: */
- if (skb == NULL) {
- DeinitBoard(dev);
- InitBoard(dev);
- return 0; /* don't try to free the block here ;-) */
- }
- /* is there space in the Tx queue ? If no, the upper layer gave us a
- packet in spite of us not being ready and is really in trouble.
- We'll do the dropping for him: */
- if (priv->txbusy >= TXCOUNT) {
- priv->stat.tx_dropped++;
- retval = -EIO;
- goto tx_done;
- }
- /* get TX descriptor */
- address = RAM_TXBASE + (priv->nexttxput * sizeof(LANCE_TxDescr));
- SKMCA_FROMIO(&descr, dev->mem_start + address,
- sizeof(LANCE_TxDescr));
- /* enter packet length as 2s complement - assure minimum length */
- tmplen = skb->len;
- if (tmplen < 60)
- tmplen = 60;
- descr.Len = 65536 - tmplen;
- /* copy filler into RAM - in case we're filling up...
- we're filling a bit more than necessary, but that doesn't harm
- since the buffer is far larger... */
- if (tmplen > skb->len) {
- char *fill = "NetBSD is a nice OS too! ";
- unsigned int destoffs = 0, l = strlen(fill);
- while (destoffs < tmplen) {
- SKMCA_TOIO(dev->mem_start + descr.LowAddr +
- destoffs, fill, l);
- destoffs += l;
- }
- }
- /* do the real data copying */
- SKMCA_TOIO(dev->mem_start + descr.LowAddr, skb->data, skb->len);
- /* hand descriptor over to LANCE - this is the first and last chunk */
- descr.Flags =
- TXDSCR_FLAGS_OWN | TXDSCR_FLAGS_STP | TXDSCR_FLAGS_ENP;
- #ifdef DEBUG
- PrTime();
- printk("Send packet on descr %d len %dn", priv->nexttxput,
- skb->len);
- #endif
- /* one more descriptor busy */
- save_flags(flags);
- cli();
- priv->nexttxput++;
- if (priv->nexttxput >= TXCOUNT)
- priv->nexttxput = 0;
- priv->txbusy++;
- /* are we saturated ? */
- if (priv->txbusy >= TXCOUNT)
- #if (LINUX_VERSION_CODE >= 0x02032a)
- netif_stop_queue(dev);
- #else
- dev->tbusy = 1;
- #endif
- /* write descriptor back to RAM */
- SKMCA_TOIO(dev->mem_start + address, &descr,
- sizeof(LANCE_TxDescr));
- /* if no descriptors were active, give the LANCE a hint to read it
- immediately */
- if (priv->txbusy == 0)
- SetLANCE(dev, LANCE_CSR0, CSR0_INEA | CSR0_TDMD);
- restore_flags(flags);
- tx_done:
- /* When did that change exactly ? */
- #if LINUX_VERSION_CODE >= 0x020200
- dev_kfree_skb(skb);
- #else
- dev_kfree_skb(skb, FREE_WRITE);
- #endif
- return retval;
- }
- /* return pointer to Ethernet statistics */
- static struct net_device_stats *skmca_stats(struct SKMCA_NETDEV *dev)
- {
- skmca_priv *priv = (skmca_priv *) dev->priv;
- return &(priv->stat);
- }
- /* we don't support runtime reconfiguration, since an MCA card can
- be unambigously identified by its POS registers. */
- static int skmca_config(struct SKMCA_NETDEV *dev, struct ifmap *map)
- {
- return 0;
- }
- /* switch receiver mode. We use the LANCE's multicast filter to prefilter
- multicast addresses. */
- static void skmca_set_multicast_list(struct SKMCA_NETDEV *dev)
- {
- LANCE_InitBlock block;
- /* first stop the LANCE... */
- StopLANCE(dev);
- /* ...then modify the initialization block... */
- SKMCA_FROMIO(&block, dev->mem_start + RAM_INITBASE, sizeof(block));
- if (dev->flags & IFF_PROMISC)
- block.Mode |= LANCE_INIT_PROM;
- else
- block.Mode &= ~LANCE_INIT_PROM;
- if (dev->flags & IFF_ALLMULTI) { /* get all multicasts */
- memset(block.LAdrF, 8, 0xff);
- } else { /* get selected/no multicasts */
- struct dev_mc_list *mptr;
- int code;
- memset(block.LAdrF, 8, 0x00);
- for (mptr = dev->mc_list; mptr != NULL; mptr = mptr->next) {
- code = GetHash(mptr->dmi_addr);
- block.LAdrF[(code >> 3) & 7] |= 1 << (code & 7);
- }
- }
- SKMCA_TOIO(dev->mem_start + RAM_INITBASE, &block, sizeof(block));
- /* ...then reinit LANCE with the correct flags */
- InitLANCE(dev);
- }
- /* ------------------------------------------------------------------------
- * hardware check
- * ------------------------------------------------------------------------ */
- static int startslot; /* counts through slots when probing multiple devices */
- int __init skmca_probe(struct SKMCA_NETDEV *dev)
- {
- int force_detect = 0;
- int junior, slot, i;
- int base = 0, irq = 0;
- skmca_priv *priv;
- skmca_medium medium;
- /* can't work without an MCA bus ;-) */
- if (MCA_bus == 0)
- return -ENODEV;
- SET_MODULE_OWNER(dev);
- /* start address of 1 --> forced detection */
- if (dev->mem_start == 1)
- force_detect = 1;
- /* search through slots */
- if (dev != NULL) {
- base = dev->mem_start;
- irq = dev->irq;
- }
- slot = dofind(&junior, startslot);
- while (slot != -1) {
- /* deduce card addresses */
- getaddrs(slot, junior, &base, &irq, &medium);
- #if LINUX_VERSION_CODE >= 0x020300
- /* slot already in use ? */
- if (mca_is_adapter_used(slot)) {
- slot = dofind(&junior, slot + 1);
- continue;
- }
- #endif
- /* were we looking for something different ? */
- if ((dev->irq != 0) || (dev->mem_start != 0)) {
- if ((dev->irq != 0) && (dev->irq != irq)) {
- slot = dofind(&junior, slot + 1);
- continue;
- }
- if ((dev->mem_start != 0)
- && (dev->mem_start != base)) {
- slot = dofind(&junior, slot + 1);
- continue;
- }
- }
- /* found something that matches */
- break;
- }
- /* nothing found ? */
- if (slot == -1)
- return ((base != 0) || (irq != 0)) ? ENXIO : ENODEV;
- /* make procfs entries */
- if (junior)
- mca_set_adapter_name(slot,
- "SKNET junior MC2 Ethernet Adapter");
- else
- mca_set_adapter_name(slot, "SKNET MC2+ Ethernet Adapter");
- mca_set_adapter_procfn(slot, (MCA_ProcFn) skmca_getinfo, dev);
- #if LINUX_VERSION_CODE >= 0x020200
- mca_mark_as_used(slot);
- #endif
- /* announce success */
- printk("%s: SKNet %s adapter found in slot %dn", dev->name,
- junior ? "Junior MC2" : "MC2+", slot + 1);
- /* allocate structure */
- priv = dev->priv =
- (skmca_priv *) kmalloc(sizeof(skmca_priv), GFP_KERNEL);
- if (!priv)
- return -ENOMEM;
- priv->slot = slot;
- priv->macbase = base + 0x3fc0;
- priv->ioregaddr = base + 0x3ff0;
- priv->ctrladdr = base + 0x3ff2;
- priv->cmdaddr = base + 0x3ff3;
- priv->medium = medium;
- memset(&(priv->stat), 0, sizeof(struct net_device_stats));
- /* set base + irq for this device (irq not allocated so far) */
- dev->irq = 0;
- dev->mem_start = base;
- dev->mem_end = base + 0x4000;
- /* autoprobe ? */
- if (irq < 0) {
- int nirq;
- printk
- ("%s: ambigous POS bit combination, must probe for IRQ...n",
- dev->name);
- nirq = ProbeIRQ(dev);
- if (nirq <= 0)
- printk("%s: IRQ probe failed, assuming IRQ %d",
- dev->name, priv->realirq = -irq);
- else
- priv->realirq = nirq;
- } else
- priv->realirq = irq;
- /* set methods */
- dev->open = skmca_open;
- dev->stop = skmca_close;
- dev->set_config = skmca_config;
- dev->hard_start_xmit = skmca_tx;
- dev->do_ioctl = NULL;
- dev->get_stats = skmca_stats;
- dev->set_multicast_list = skmca_set_multicast_list;
- dev->flags |= IFF_MULTICAST;
- /* generic setup */
- ether_setup(dev);
- /* copy out MAC address */
- for (i = 0; i < 6; i++)
- dev->dev_addr[i] = SKMCA_READB(priv->macbase + (i << 1));
- /* print config */
- printk("%s: IRQ %d, memory %#lx-%#lx, "
- "MAC address %02x:%02x:%02x:%02x:%02x:%02x.n",
- dev->name, priv->realirq, dev->mem_start, dev->mem_end - 1,
- dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
- dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
- printk("%s: %s mediumn", dev->name, MediaNames[priv->medium]);
- /* reset board */
- ResetBoard(dev);
- startslot = slot + 1;
- return 0;
- }
- /* ------------------------------------------------------------------------
- * modularization support
- * ------------------------------------------------------------------------ */
- #ifdef MODULE
- MODULE_LICENSE("GPL");
- #define DEVMAX 5
- #if (LINUX_VERSION_CODE >= 0x020369)
- static struct SKMCA_NETDEV moddevs[DEVMAX] =
- { {" ", 0, 0, 0, 0, 0, 0, 0, 0, 0, NULL, skmca_probe},
- {" ", 0, 0, 0, 0, 0, 0, 0, 0, 0, NULL, skmca_probe},
- {" ", 0, 0, 0, 0, 0, 0, 0, 0, 0, NULL, skmca_probe},
- {" ", 0, 0, 0, 0, 0, 0, 0, 0, 0, NULL, skmca_probe},
- {" ", 0, 0, 0, 0, 0, 0, 0, 0, 0, NULL, skmca_probe}
- };
- #else
- static char NameSpace[8 * DEVMAX];
- static struct SKMCA_NETDEV moddevs[DEVMAX] =
- { {NameSpace + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, NULL, skmca_probe},
- {NameSpace + 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, NULL, skmca_probe},
- {NameSpace + 16, 0, 0, 0, 0, 0, 0, 0, 0, 0, NULL, skmca_probe},
- {NameSpace + 24, 0, 0, 0, 0, 0, 0, 0, 0, 0, NULL, skmca_probe},
- {NameSpace + 32, 0, 0, 0, 0, 0, 0, 0, 0, 0, NULL, skmca_probe}
- };
- #endif
- int irq;
- int io;
- int init_module(void)
- {
- int z, res;
- startslot = 0;
- for (z = 0; z < DEVMAX; z++) {
- strcpy(moddevs[z].name, " ");
- res = register_netdev(moddevs + z);
- if (res != 0)
- return (z > 0) ? 0 : -EIO;
- }
- return 0;
- }
- void cleanup_module(void)
- {
- struct SKMCA_NETDEV *dev;
- skmca_priv *priv;
- int z;
- if (MOD_IN_USE) {
- printk("cannot unload, module in usen");
- return;
- }
- for (z = 0; z < DEVMAX; z++) {
- dev = moddevs + z;
- if (dev->priv != NULL) {
- priv = (skmca_priv *) dev->priv;
- DeinitBoard(dev);
- if (dev->irq != 0)
- free_irq(dev->irq, dev);
- dev->irq = 0;
- unregister_netdev(dev);
- #if LINUX_VERSION_CODE >= 0x020200
- mca_mark_as_unused(priv->slot);
- #endif
- mca_set_adapter_procfn(priv->slot, NULL, NULL);
- kfree(dev->priv);
- dev->priv = NULL;
- }
- }
- }
- #endif /* MODULE */