/*
*
* Copyright (c) 1999-2000 Grant Erickson <grant@lcse.umn.edu>
*
* Module name: oaknet.c
*
* Description:
* Driver for the National Semiconductor DP83902AV Ethernet controller
* on-board the IBM PowerPC "Oak" evaluation board. Adapted from the
* various other 8390 drivers written by Donald Becker and Paul Gortmaker.
*
* Additional inspiration from the "tcd8390.c" driver from TiVo, Inc.
* and "enetLib.c" from IBM.
*
*/
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/init.h>
#include <asm/board.h>
#include <asm/io.h>
#include "8390.h"
/* Preprocessor Defines */
#if !defined(TRUE) || TRUE != 1
#define TRUE 1
#endif
#if !defined(FALSE) || FALSE != 0
#define FALSE 0
#endif
#define OAKNET_START_PG 0x20 /* First page of TX buffer */
#define OAKNET_STOP_PG 0x40 /* Last pagge +1 of RX ring */
#define OAKNET_WAIT (2 * HZ / 100) /* 20 ms */
/* Experimenting with some fixes for a broken driver... */
#define OAKNET_DISINT
#define OAKNET_HEADCHECK
#define OAKNET_RWFIX
/* Global Variables */
static const char *name = "National DP83902AV";
static struct net_device *oaknet_devs;
/* Function Prototypes */
static int oaknet_open(struct net_device *dev);
static int oaknet_close(struct net_device *dev);
static void oaknet_reset_8390(struct net_device *dev);
static void oaknet_get_8390_hdr(struct net_device *dev,
struct e8390_pkt_hdr *hdr, int ring_page);
static void oaknet_block_input(struct net_device *dev, int count,
struct sk_buff *skb, int ring_offset);
static void oaknet_block_output(struct net_device *dev, int count,
const unsigned char *buf, int start_page);
static void oaknet_dma_error(struct net_device *dev, const char *name);
/*
* int oaknet_init()
*
* Description:
* This routine performs all the necessary platform-specific initiali-
* zation and set-up for the IBM "Oak" evaluation board's National
* Semiconductor DP83902AV "ST-NIC" Ethernet controller.
*
* Input(s):
* N/A
*
* Output(s):
* N/A
*
* Returns:
* 0 if OK, otherwise system error number on error.
*
*/
static int __init oaknet_init(void)
{
register int i;
int reg0, regd;
int ret = -ENOMEM;
struct net_device *dev;
#if 0
unsigned long ioaddr = OAKNET_IO_BASE;
#else
unsigned long ioaddr = ioremap(OAKNET_IO_BASE, OAKNET_IO_SIZE);
#endif
bd_t *bip = (bd_t *)__res;
if (!ioaddr)
return -ENOMEM;
dev = alloc_ei_netdev();
if (!dev)
goto out_unmap;
ret = -EBUSY;
if (!request_region(OAKNET_IO_BASE, OAKNET_IO_SIZE, name))
goto out_dev;
/* Quick register check to see if the device is really there. */
ret = -ENODEV;
if ((reg0 = ei_ibp(ioaddr)) == 0xFF)
goto out_region;
/*
* That worked. Now a more thorough check, using the multicast
* address registers, that the device is definitely out there
* and semi-functional.
*/
ei_obp(E8390_NODMA + E8390_PAGE1 + E8390_STOP, ioaddr + E8390_CMD);
regd = ei_ibp(ioaddr + 0x0D);
ei_obp(0xFF, ioaddr + 0x0D);
ei_obp(E8390_NODMA + E8390_PAGE0, ioaddr + E8390_CMD);
ei_ibp(ioaddr + EN0_COUNTER0);
/* It's no good. Fix things back up and leave. */
ret = -ENODEV;
if (ei_ibp(ioaddr + EN0_COUNTER0) != 0) {
ei_obp(reg0, ioaddr);
ei_obp(regd, ioaddr + 0x0D);
goto out_region;
}
SET_MODULE_OWNER(dev);
/*
* This controller is on an embedded board, so the base address
* and interrupt assignments are pre-assigned and unchageable.
*/
dev->base_addr = ioaddr;
dev->irq = OAKNET_INT;
/*
* Disable all chip interrupts for now and ACK all pending
* interrupts.
*/
ei_obp(0x0, ioaddr + EN0_IMR);
ei_obp(0xFF, ioaddr + EN0_ISR);
/* Attempt to get the interrupt line */
ret = -EAGAIN;
if (request_irq(dev->irq, ei_interrupt, 0, name, dev)) {
printk("%s: unable to request interrupt %d.\n",
name, dev->irq);
goto out_region;
}
/* Tell the world about what and where we've found. */
printk("%s: %s at", dev->name, name);
for (i = 0; i < ETHER_ADDR_LEN; ++i) {
dev->dev_addr[i] = bip->bi_enetaddr[i];
printk("%c%.2x", (i ? ':' : ' '), dev->dev_addr[i]);
}
printk(", found at %#lx, using IRQ %d.\n", dev->base_addr, dev->irq);
/* Set up some required driver fields and then we're done. */
ei_status.name = name;
ei_status.word16 = FALSE;
ei_status.tx_start_page = OAKNET_START_PG;
ei_status.rx_start_page = OAKNET_START_PG + TX_PAGES;
ei_status.stop_page = OAKNET_STOP_PG;
ei_status.reset_8390 = &oaknet_reset_8390;
ei_status.block_input = &oaknet_block_input;
ei_status.block_output = &oaknet_block_output;
ei_status.get_8390_hdr = &oaknet_get_8390_hdr;
dev->open = oaknet_open;
dev->stop = oaknet_close;
#ifdef CONFIG_NET_POLL_CONTROLLER
dev->poll_controller = ei_poll;
#endif
NS8390_init(dev, FALSE);
ret = register_netdev(dev);
if (ret)
goto out_irq;
oaknet_devs = dev;
return 0;
out_irq;
free_irq(dev->irq, dev);
out_region:
release_region(OAKNET_IO_BASE, OAKNET_IO_SIZE);
out_dev:
free_netdev(dev);
out_unmap:
iounmap(ioaddr);
return ret;
}
/*
* static int oaknet_open()
*
* Description:
* This routine is a modest wrapper around ei_open, the 8390-generic,
* driver open routine. This just increments the module usage count
* and passes along the status from ei_open.
*
* Input(s):
* *dev - Pointer to the device structure for this driver.
*
* Output(s):
* *dev - Pointer to the device structure for this driver, potentially
* modified by ei_open.
*
* Returns:
* 0 if OK, otherwise < 0 on error.
*
*/
static int
oaknet_open(struct net_device *dev)
{
int status = ei_open(dev);
return (status);
}
/*
* static int oaknet_close()
*
* Description:
* This routine is a modest wrapper around ei_close, the 8390-generic,
* driver close routine. This just decrements the module usage count
* and passes along the status from ei_close.
*
* Input(s):
* *dev - Pointer to the device structure for this driver.
*
* Output(s):
* *dev - Pointer to the device structure for this driver, potentially
* modified by ei_close.
*
* Returns:
* 0 if OK, otherwise < 0 on error.
*
*/
static int
oaknet_close(struct net_device *dev)
{
int status = ei_close(dev);
return (status);
}
/*
* static void oaknet_reset_8390()
*
* Description:
* This routine resets the DP83902 chip.
*
* Input(s):
* *dev - Pointer to the device structure for this driver.
*
* Output(s):
* N/A
*
* Returns:
* N/A
*
*/
static void
oaknet_reset_8390(struct net_device *dev)
{
int base = E8390_BASE;
/*
* We have no provision of reseting the controller as is done
* in other drivers, such as "ne.c". However, the following
* seems to work well enough in the TiVo driver.
*/
printk("Resetting %s...\n", dev->name);
ei_obp(E8390_STOP | E8390_NODMA | E8390_PAGE0, base + E8390_CMD);
ei_status.txing = 0;
ei_status.dmaing = 0;
}
/*
* static void oaknet_get_8390_hdr()
*
* Description:
* This routine grabs the 8390-specific header. It's similar to the
* block input routine, but we don't need to be concerned with ring wrap
* as the header will be at the start of a page, so we optimize accordingly.
*
* Input(s):
* *dev - Pointer to the device structure for this driver.
* *hdr - Pointer to storage for the 8390-specific packet header.
* ring_page - ?
*
* Output(s):
* *hdr - Pointer to the 8390-specific packet header for the just-
* received frame.
*
* Returns:
* N/A
*
*/
static void
oaknet_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
int ring_page)
{
int base = dev->base_addr;
/*
* This should NOT happen. If it does, it is the LAST thing you'll
* see.
*/
if (ei_status.dmaing) {
oaknet_dma_error(dev, "oaknet_get_8390_hdr");
return;
}
ei_status.dmaing |= 0x01;
outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START, base + OAKNET_CMD);
outb_p(sizeof(struct e8390_pkt_hdr), base + EN0_RCNTLO);
outb_p(0, base + EN0_RCNTHI);
outb_p(0, base + EN0_RSARLO); /* On page boundary */
outb_p(ring_page, base + EN0_RSARHI);
outb_p(E8390_RREAD + E8390_START, base + OAKNET_CMD);
if (ei_status.word16)
insw(base + OAKNET_DATA, hdr,
sizeof(struct e8390_pkt_hdr) >> 1);
else
insb(base + OAKNET_DATA, hdr,
sizeof(struct e8390_pkt_hdr));
/* Byte-swap the packet byte count */
hdr->count = le16_to_cpu(hdr->count);
outb_p(ENISR_RDC, base + EN0_ISR); /* ACK Remote DMA interrupt */
ei_status.dmaing &= ~0x01;
}
/*
* XXX - Document me.
*/
static void
oaknet_block_input(struct net_device *dev, int count, struct sk_buff *skb,
int ring_offset)
{
int base = OAKNET_BASE;
char *buf = skb->data;
/*
* This should NOT happen. If it does, it is the LAST thing you'll
* see.
*/
if (ei_status.dmaing) {
oaknet_dma_error(dev, "oaknet_block_input");
return;
}
#ifdef OAKNET_DISINT
save_flags(flags);
cli();
#endif
ei_status.dmaing |= 0x01;
ei_obp(E8390_NODMA + E8390_PAGE0 + E8390_START, base + E8390_CMD);
ei_obp(count & 0xff, base + EN0_RCNTLO);
ei_obp(count >> 8, base + EN0_RCNTHI);
ei_obp(ring_offset & 0xff, base + EN0_RSARLO);
ei_obp(ring_offset >> 8, base + EN0_RSARHI);
ei_obp(E8390_RREAD + E8390_START, base + E8390_CMD);
if (ei_status.word16) {
ei_isw(base + E8390_DATA, buf, count >> 1);
if (count & 0x01) {
buf[count - 1] = ei_ib(base + E8390_DATA);
#ifdef OAKNET_HEADCHECK
bytes++;
#endif
}
} else {
ei_isb(base + E8390_DATA, buf, count);
}
#ifdef OAKNET_HEADCHECK
/*
* This was for the ALPHA version only, but enough people have
* been encountering problems so it is still here. If you see
* this message you either 1) have a slightly incompatible clone
* or 2) have noise/speed problems with your bus.
*/
/* DMA termination address check... */
{
int addr, tries = 20;
do {
/* DON'T check for 'ei_ibp(EN0_ISR) & ENISR_RDC' here
-- it's broken for Rx on some cards! */
int high = ei_ibp(base + EN0_RSARHI);
int low = ei_ibp(base + EN0_RSARLO);
addr = (high << 8) + low;
if (((ring_offset + bytes) & 0xff) == low)
break;
} while (--tries > 0);
if (tries <= 0)
printk("%s: RX transfer address mismatch,"
"%#4.4x (expected) vs. %#4.4x (actual).\n",
dev->name, ring_offset + bytes, addr);
}
#endif
ei_obp(ENISR_RDC, base + EN0_ISR); /* ACK Remote DMA interrupt */
ei_status.dmaing &= ~0x01;
#ifdef OAKNET_DISINT
restore_flags(flags);
#endif
}
/*
* static void oaknet_block_output()
*
* Description:
* This routine...
*
* Input(s):
* *dev - Pointer to the device structure for this driver.
* count - Number of bytes to be transferred.
* *buf -
* start_page -
*
* Output(s):
* N/A
*
* Returns:
* N/A
*
*/
static void
oaknet_block_output(struct net_device *dev, int count,
const unsigned char *buf, int start_page)
{
int base = E8390_BASE;
#if 0
int bug;
#endif
unsigned long start;
#ifdef OAKNET_DISINT
unsigned long flags;
#endif
#ifdef OAKNET_HEADCHECK
int retries = 0;
#endif
/* Round the count up for word writes. */
if (ei_status.word16 && (count & 0x1))
count++;
/*
* This should NOT happen. If it does, it is the LAST thing you'll
* see.
*/
if (ei_status.dmaing) {
oaknet_dma_error(dev, "oaknet_block_output");
return;
}
#ifdef OAKNET_DISINT
save_flags(flags);
cli();
#endif
ei_status.dmaing |= 0x01;
/* Make sure we are in page 0. */
ei_obp(E8390_PAGE0 + E8390_START + E8390_NODMA, base + E8390_CMD);
#ifdef OAKNET_HEADCHECK
retry:
#endif
#if 0
/*
* The 83902 documentation states that the processor needs to
* do a "dummy read" before doing the remote write to work
* around a chip bug they don't feel like fixing.
*/
bug = 0;
while (1) {
unsigned int rdhi;
unsigned int rdlo;
/* Now the normal output. */
ei_obp(ENISR_RDC, base + EN0_ISR);
ei_obp(count & 0xff, base + EN0_RCNTLO);
ei_obp(count >> 8, base + EN0_RCNTHI);
ei_obp(0x00, base + EN0_RSARLO);
ei_obp(start_page, base + EN0_RSARHI);
if (bug++)
break;
/* Perform the dummy read */
rdhi = ei_ibp(base + EN0_CRDAHI);
rdlo = ei_ibp(base + EN0_CRDALO);
ei_obp(E8390_RREAD + E8390_START, base + E8390_CMD);
while (1) {
unsigned int nrdhi;
unsigned int nrdlo;
nrdhi = ei_ibp(base + EN0_CRDAHI);
nrdlo = ei_ibp(base + EN0_CRDALO);
if ((rdhi != nrdhi) || (rdlo != nrdlo))
break;
}
}
#else
#ifdef OAKNET_RWFIX
/*
* Handle the read-before-write bug the same way as the
* Crynwr packet driver -- the Nat'l Semi. method doesn't work.
* Actually this doesn't always work either, but if you have
* problems with your 83902 this is better than nothing!
*/
ei_obp(0x42, base + EN0_RCNTLO);
ei_obp(0x00, base + EN0_RCNTHI);
ei_obp(0x42, base + EN0_RSARLO);
ei_obp(0x00, base + EN0_RSARHI);
ei_obp(E8390_RREAD + E8390_START, base + E8390_CMD);
/* Make certain that the dummy read has occurred. */
udelay(6);
#endif
ei_obp(ENISR_RDC, base + EN0_ISR);
/* Now the normal output. */
ei_obp(count & 0xff, base + EN0_RCNTLO);
ei_obp(count >> 8, base + EN0_RCNTHI);
ei_obp(0x00, base + EN0_RSARLO);
ei_obp(start_page, base + EN0_RSARHI);
#endif /* 0/1 */
ei_obp(E8390_RWRITE + E8390_START, base + E8390_CMD);
if (ei_status.word16) {
ei_osw(E8390_BASE + E8390_DATA, buf, count >> 1);
} else {
ei_osb(E8390_BASE + E8390_DATA, buf, count);
}
#ifdef OAKNET_DISINT
restore_flags(flags);
#endif
start = jiffies;
#ifdef OAKNET_HEADCHECK
/*
* This was for the ALPHA version only, but enough people have
* been encountering problems so it is still here.
*/
{
/* DMA termination address check... */
int addr, tries = 20;
do {
int high = ei_ibp(base + EN0_RSARHI);
int low = ei_ibp(base + EN0_RSARLO);
addr = (high << 8) + low;
if ((start_page << 8) + count == addr)
break;
} while (--tries > 0);
if (tries <= 0) {
printk("%s: Tx packet transfer address mismatch,"
"%#4.4x (expected) vs. %#4.4x (actual).\n",
dev->name, (start_page << 8) + count, addr);
if (retries++ == 0)
goto retry;
}
}
#endif
while ((ei_ibp(base + EN0_ISR) & ENISR_RDC) == 0) {
if (jiffies - start > OAKNET_WAIT) {
printk("%s: timeout waiting for Tx RDC.\n", dev->name);
oaknet_reset_8390(dev);
NS8390_init(dev, TRUE);
break;
}
}
ei_obp(ENISR_RDC, base + EN0_ISR); /* Ack intr. */
ei_status.dmaing &= ~0x01;
}
/*
* static void oaknet_dma_error()
*
* Description:
* This routine prints out a last-ditch informative message to the console
* indicating that a DMA error occurred. If you see this, it's the last
* thing you'll see.
*
* Input(s):
* *dev - Pointer to the device structure for this driver.
* *name - Informative text (e.g. function name) indicating where the
* DMA error occurred.
*
* Output(s):
* N/A
*
* Returns:
* N/A
*
*/
static void
oaknet_dma_error(struct net_device *dev, const char *name)
{
printk(KERN_EMERG "%s: DMAing conflict in %s."
"[DMAstat:%d][irqlock:%d][intr:%ld]\n",
dev->name, name, ei_status.dmaing, ei_status.irqlock,
dev->interrupt);
}
/*
* Oak Ethernet module unload interface.
*/
static void __exit oaknet_cleanup_module (void)
{
/* Convert to loop once driver supports multiple devices. */
unregister_netdev(oaknet_dev);
free_irq(oaknet_devs->irq, oaknet_devs);
release_region(oaknet_devs->base_addr, OAKNET_IO_SIZE);
iounmap(ioaddr);
free_netdev(oaknet_devs);
}
module_init(oaknet_init);
module_exit(oaknet_cleanup_module);
MODULE_LICENSE("GPL");
