mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 00:56:39 +07:00
6aa20a2235
Signed-off-by: Jeff Garzik <jeff@garzik.org>
667 lines
15 KiB
C
667 lines
15 KiB
C
/*
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*
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* Copyright (c) 1999-2000 Grant Erickson <grant@lcse.umn.edu>
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*
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* Module name: oaknet.c
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*
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* Description:
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* Driver for the National Semiconductor DP83902AV Ethernet controller
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* on-board the IBM PowerPC "Oak" evaluation board. Adapted from the
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* various other 8390 drivers written by Donald Becker and Paul Gortmaker.
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*
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* Additional inspiration from the "tcd8390.c" driver from TiVo, Inc.
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* and "enetLib.c" from IBM.
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*
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*/
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/delay.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/init.h>
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#include <linux/jiffies.h>
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#include <asm/board.h>
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#include <asm/io.h>
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#include "8390.h"
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/* Preprocessor Defines */
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#if !defined(TRUE) || TRUE != 1
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#define TRUE 1
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#endif
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#if !defined(FALSE) || FALSE != 0
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#define FALSE 0
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#endif
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#define OAKNET_START_PG 0x20 /* First page of TX buffer */
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#define OAKNET_STOP_PG 0x40 /* Last pagge +1 of RX ring */
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#define OAKNET_WAIT (2 * HZ / 100) /* 20 ms */
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/* Experimenting with some fixes for a broken driver... */
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#define OAKNET_DISINT
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#define OAKNET_HEADCHECK
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#define OAKNET_RWFIX
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/* Global Variables */
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static const char *name = "National DP83902AV";
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static struct net_device *oaknet_devs;
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/* Function Prototypes */
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static int oaknet_open(struct net_device *dev);
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static int oaknet_close(struct net_device *dev);
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static void oaknet_reset_8390(struct net_device *dev);
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static void oaknet_get_8390_hdr(struct net_device *dev,
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struct e8390_pkt_hdr *hdr, int ring_page);
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static void oaknet_block_input(struct net_device *dev, int count,
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struct sk_buff *skb, int ring_offset);
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static void oaknet_block_output(struct net_device *dev, int count,
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const unsigned char *buf, int start_page);
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static void oaknet_dma_error(struct net_device *dev, const char *name);
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/*
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* int oaknet_init()
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*
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* Description:
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* This routine performs all the necessary platform-specific initiali-
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* zation and set-up for the IBM "Oak" evaluation board's National
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* Semiconductor DP83902AV "ST-NIC" Ethernet controller.
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*
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* Input(s):
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* N/A
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*
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* Output(s):
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* N/A
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*
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* Returns:
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* 0 if OK, otherwise system error number on error.
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*
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*/
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static int __init oaknet_init(void)
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{
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register int i;
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int reg0, regd;
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int ret = -ENOMEM;
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struct net_device *dev;
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#if 0
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unsigned long ioaddr = OAKNET_IO_BASE;
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#else
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unsigned long ioaddr = ioremap(OAKNET_IO_BASE, OAKNET_IO_SIZE);
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#endif
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bd_t *bip = (bd_t *)__res;
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if (!ioaddr)
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return -ENOMEM;
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dev = alloc_ei_netdev();
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if (!dev)
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goto out_unmap;
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ret = -EBUSY;
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if (!request_region(OAKNET_IO_BASE, OAKNET_IO_SIZE, name))
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goto out_dev;
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/* Quick register check to see if the device is really there. */
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ret = -ENODEV;
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if ((reg0 = ei_ibp(ioaddr)) == 0xFF)
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goto out_region;
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/*
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* That worked. Now a more thorough check, using the multicast
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* address registers, that the device is definitely out there
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* and semi-functional.
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*/
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ei_obp(E8390_NODMA + E8390_PAGE1 + E8390_STOP, ioaddr + E8390_CMD);
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regd = ei_ibp(ioaddr + 0x0D);
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ei_obp(0xFF, ioaddr + 0x0D);
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ei_obp(E8390_NODMA + E8390_PAGE0, ioaddr + E8390_CMD);
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ei_ibp(ioaddr + EN0_COUNTER0);
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/* It's no good. Fix things back up and leave. */
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ret = -ENODEV;
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if (ei_ibp(ioaddr + EN0_COUNTER0) != 0) {
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ei_obp(reg0, ioaddr);
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ei_obp(regd, ioaddr + 0x0D);
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goto out_region;
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}
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SET_MODULE_OWNER(dev);
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/*
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* This controller is on an embedded board, so the base address
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* and interrupt assignments are pre-assigned and unchageable.
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*/
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dev->base_addr = ioaddr;
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dev->irq = OAKNET_INT;
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/*
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* Disable all chip interrupts for now and ACK all pending
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* interrupts.
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*/
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ei_obp(0x0, ioaddr + EN0_IMR);
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ei_obp(0xFF, ioaddr + EN0_ISR);
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/* Attempt to get the interrupt line */
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ret = -EAGAIN;
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if (request_irq(dev->irq, ei_interrupt, 0, name, dev)) {
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printk("%s: unable to request interrupt %d.\n",
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name, dev->irq);
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goto out_region;
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}
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/* Tell the world about what and where we've found. */
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printk("%s: %s at", dev->name, name);
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for (i = 0; i < ETHER_ADDR_LEN; ++i) {
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dev->dev_addr[i] = bip->bi_enetaddr[i];
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printk("%c%.2x", (i ? ':' : ' '), dev->dev_addr[i]);
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}
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printk(", found at %#lx, using IRQ %d.\n", dev->base_addr, dev->irq);
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/* Set up some required driver fields and then we're done. */
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ei_status.name = name;
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ei_status.word16 = FALSE;
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ei_status.tx_start_page = OAKNET_START_PG;
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ei_status.rx_start_page = OAKNET_START_PG + TX_PAGES;
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ei_status.stop_page = OAKNET_STOP_PG;
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ei_status.reset_8390 = &oaknet_reset_8390;
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ei_status.block_input = &oaknet_block_input;
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ei_status.block_output = &oaknet_block_output;
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ei_status.get_8390_hdr = &oaknet_get_8390_hdr;
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dev->open = oaknet_open;
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dev->stop = oaknet_close;
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#ifdef CONFIG_NET_POLL_CONTROLLER
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dev->poll_controller = ei_poll;
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#endif
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NS8390_init(dev, FALSE);
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ret = register_netdev(dev);
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if (ret)
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goto out_irq;
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oaknet_devs = dev;
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return 0;
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out_irq;
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free_irq(dev->irq, dev);
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out_region:
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release_region(OAKNET_IO_BASE, OAKNET_IO_SIZE);
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out_dev:
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free_netdev(dev);
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out_unmap:
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iounmap(ioaddr);
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return ret;
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}
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/*
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* static int oaknet_open()
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*
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* Description:
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* This routine is a modest wrapper around ei_open, the 8390-generic,
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* driver open routine. This just increments the module usage count
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* and passes along the status from ei_open.
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*
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* Input(s):
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* *dev - Pointer to the device structure for this driver.
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*
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* Output(s):
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* *dev - Pointer to the device structure for this driver, potentially
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* modified by ei_open.
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*
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* Returns:
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* 0 if OK, otherwise < 0 on error.
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*
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*/
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static int
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oaknet_open(struct net_device *dev)
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{
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int status = ei_open(dev);
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return (status);
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}
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/*
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* static int oaknet_close()
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*
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* Description:
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* This routine is a modest wrapper around ei_close, the 8390-generic,
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* driver close routine. This just decrements the module usage count
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* and passes along the status from ei_close.
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*
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* Input(s):
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* *dev - Pointer to the device structure for this driver.
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*
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* Output(s):
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* *dev - Pointer to the device structure for this driver, potentially
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* modified by ei_close.
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*
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* Returns:
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* 0 if OK, otherwise < 0 on error.
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*
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*/
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static int
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oaknet_close(struct net_device *dev)
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{
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int status = ei_close(dev);
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return (status);
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}
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/*
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* static void oaknet_reset_8390()
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*
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* Description:
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* This routine resets the DP83902 chip.
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*
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* Input(s):
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* *dev - Pointer to the device structure for this driver.
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*
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* Output(s):
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* N/A
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*
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* Returns:
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* N/A
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*
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*/
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static void
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oaknet_reset_8390(struct net_device *dev)
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{
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int base = E8390_BASE;
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/*
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* We have no provision of reseting the controller as is done
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* in other drivers, such as "ne.c". However, the following
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* seems to work well enough in the TiVo driver.
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*/
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printk("Resetting %s...\n", dev->name);
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ei_obp(E8390_STOP | E8390_NODMA | E8390_PAGE0, base + E8390_CMD);
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ei_status.txing = 0;
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ei_status.dmaing = 0;
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}
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/*
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* static void oaknet_get_8390_hdr()
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*
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* Description:
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* This routine grabs the 8390-specific header. It's similar to the
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* block input routine, but we don't need to be concerned with ring wrap
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* as the header will be at the start of a page, so we optimize accordingly.
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*
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* Input(s):
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* *dev - Pointer to the device structure for this driver.
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* *hdr - Pointer to storage for the 8390-specific packet header.
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* ring_page - ?
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*
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* Output(s):
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* *hdr - Pointer to the 8390-specific packet header for the just-
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* received frame.
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*
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* Returns:
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* N/A
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*
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*/
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static void
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oaknet_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
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int ring_page)
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{
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int base = dev->base_addr;
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/*
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* This should NOT happen. If it does, it is the LAST thing you'll
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* see.
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*/
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if (ei_status.dmaing) {
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oaknet_dma_error(dev, "oaknet_get_8390_hdr");
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return;
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}
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ei_status.dmaing |= 0x01;
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outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START, base + OAKNET_CMD);
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outb_p(sizeof(struct e8390_pkt_hdr), base + EN0_RCNTLO);
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outb_p(0, base + EN0_RCNTHI);
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outb_p(0, base + EN0_RSARLO); /* On page boundary */
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outb_p(ring_page, base + EN0_RSARHI);
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outb_p(E8390_RREAD + E8390_START, base + OAKNET_CMD);
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if (ei_status.word16)
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insw(base + OAKNET_DATA, hdr,
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sizeof(struct e8390_pkt_hdr) >> 1);
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else
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insb(base + OAKNET_DATA, hdr,
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sizeof(struct e8390_pkt_hdr));
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/* Byte-swap the packet byte count */
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hdr->count = le16_to_cpu(hdr->count);
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outb_p(ENISR_RDC, base + EN0_ISR); /* ACK Remote DMA interrupt */
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ei_status.dmaing &= ~0x01;
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}
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/*
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* XXX - Document me.
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*/
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static void
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oaknet_block_input(struct net_device *dev, int count, struct sk_buff *skb,
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int ring_offset)
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{
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int base = OAKNET_BASE;
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char *buf = skb->data;
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/*
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* This should NOT happen. If it does, it is the LAST thing you'll
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* see.
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*/
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if (ei_status.dmaing) {
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oaknet_dma_error(dev, "oaknet_block_input");
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return;
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}
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#ifdef OAKNET_DISINT
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save_flags(flags);
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cli();
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#endif
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ei_status.dmaing |= 0x01;
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ei_obp(E8390_NODMA + E8390_PAGE0 + E8390_START, base + E8390_CMD);
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ei_obp(count & 0xff, base + EN0_RCNTLO);
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ei_obp(count >> 8, base + EN0_RCNTHI);
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ei_obp(ring_offset & 0xff, base + EN0_RSARLO);
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ei_obp(ring_offset >> 8, base + EN0_RSARHI);
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ei_obp(E8390_RREAD + E8390_START, base + E8390_CMD);
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if (ei_status.word16) {
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ei_isw(base + E8390_DATA, buf, count >> 1);
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if (count & 0x01) {
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buf[count - 1] = ei_ib(base + E8390_DATA);
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#ifdef OAKNET_HEADCHECK
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bytes++;
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#endif
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}
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} else {
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ei_isb(base + E8390_DATA, buf, count);
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}
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#ifdef OAKNET_HEADCHECK
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/*
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* This was for the ALPHA version only, but enough people have
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* been encountering problems so it is still here. If you see
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* this message you either 1) have a slightly incompatible clone
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* or 2) have noise/speed problems with your bus.
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*/
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/* DMA termination address check... */
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{
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int addr, tries = 20;
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do {
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/* DON'T check for 'ei_ibp(EN0_ISR) & ENISR_RDC' here
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-- it's broken for Rx on some cards! */
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int high = ei_ibp(base + EN0_RSARHI);
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int low = ei_ibp(base + EN0_RSARLO);
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addr = (high << 8) + low;
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if (((ring_offset + bytes) & 0xff) == low)
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break;
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} while (--tries > 0);
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if (tries <= 0)
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printk("%s: RX transfer address mismatch,"
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"%#4.4x (expected) vs. %#4.4x (actual).\n",
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dev->name, ring_offset + bytes, addr);
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}
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#endif
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ei_obp(ENISR_RDC, base + EN0_ISR); /* ACK Remote DMA interrupt */
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ei_status.dmaing &= ~0x01;
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#ifdef OAKNET_DISINT
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restore_flags(flags);
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#endif
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}
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/*
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* static void oaknet_block_output()
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*
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* Description:
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* This routine...
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*
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* Input(s):
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* *dev - Pointer to the device structure for this driver.
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* count - Number of bytes to be transferred.
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* *buf -
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* start_page -
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*
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* Output(s):
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* N/A
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*
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* Returns:
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* N/A
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*
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*/
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static void
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oaknet_block_output(struct net_device *dev, int count,
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const unsigned char *buf, int start_page)
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{
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int base = E8390_BASE;
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#if 0
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int bug;
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#endif
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unsigned long start;
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#ifdef OAKNET_DISINT
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unsigned long flags;
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#endif
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#ifdef OAKNET_HEADCHECK
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int retries = 0;
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#endif
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/* Round the count up for word writes. */
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if (ei_status.word16 && (count & 0x1))
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count++;
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/*
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* This should NOT happen. If it does, it is the LAST thing you'll
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* see.
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*/
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if (ei_status.dmaing) {
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oaknet_dma_error(dev, "oaknet_block_output");
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return;
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}
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#ifdef OAKNET_DISINT
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save_flags(flags);
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cli();
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#endif
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ei_status.dmaing |= 0x01;
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/* Make sure we are in page 0. */
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ei_obp(E8390_PAGE0 + E8390_START + E8390_NODMA, base + E8390_CMD);
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#ifdef OAKNET_HEADCHECK
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retry:
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#endif
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#if 0
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/*
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* The 83902 documentation states that the processor needs to
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* do a "dummy read" before doing the remote write to work
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* around a chip bug they don't feel like fixing.
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*/
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bug = 0;
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while (1) {
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unsigned int rdhi;
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unsigned int rdlo;
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/* Now the normal output. */
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ei_obp(ENISR_RDC, base + EN0_ISR);
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ei_obp(count & 0xff, base + EN0_RCNTLO);
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ei_obp(count >> 8, base + EN0_RCNTHI);
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ei_obp(0x00, base + EN0_RSARLO);
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ei_obp(start_page, base + EN0_RSARHI);
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if (bug++)
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break;
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/* Perform the dummy read */
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rdhi = ei_ibp(base + EN0_CRDAHI);
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rdlo = ei_ibp(base + EN0_CRDALO);
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ei_obp(E8390_RREAD + E8390_START, base + E8390_CMD);
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while (1) {
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unsigned int nrdhi;
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unsigned int nrdlo;
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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 (time_after(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");
|