241 lines
6.6 KiB
C
241 lines
6.6 KiB
C
/* lasi_82596.c -- driver for the intel 82596 ethernet controller, as
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munged into HPPA boxen .
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This driver is based upon 82596.c, original credits are below...
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but there were too many hoops which HP wants jumped through to
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keep this code in there in a sane manner.
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3 primary sources of the mess --
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1) hppa needs *lots* of cacheline flushing to keep this kind of
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MMIO running.
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2) The 82596 needs to see all of its pointers as their physical
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address. Thus virt_to_bus/bus_to_virt are *everywhere*.
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3) The implementation HP is using seems to be significantly pickier
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about when and how the command and RX units are started. some
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command ordering was changed.
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Examination of the mach driver leads one to believe that there
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might be a saner way to pull this off... anyone who feels like a
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full rewrite can be my guest.
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Split 02/13/2000 Sam Creasey (sammy@oh.verio.com)
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02/01/2000 Initial modifications for parisc by Helge Deller (deller@gmx.de)
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03/02/2000 changes for better/correct(?) cache-flushing (deller)
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*/
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/* 82596.c: A generic 82596 ethernet driver for linux. */
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/*
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Based on Apricot.c
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Written 1994 by Mark Evans.
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This driver is for the Apricot 82596 bus-master interface
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Modularised 12/94 Mark Evans
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Modified to support the 82596 ethernet chips on 680x0 VME boards.
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by Richard Hirst <richard@sleepie.demon.co.uk>
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Renamed to be 82596.c
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980825: Changed to receive directly in to sk_buffs which are
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allocated at open() time. Eliminates copy on incoming frames
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(small ones are still copied). Shared data now held in a
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non-cached page, so we can run on 68060 in copyback mode.
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TBD:
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* look at deferring rx frames rather than discarding (as per tulip)
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* handle tx ring full as per tulip
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* performance test to tune rx_copybreak
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Most of my modifications relate to the braindead big-endian
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implementation by Intel. When the i596 is operating in
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'big-endian' mode, it thinks a 32 bit value of 0x12345678
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should be stored as 0x56781234. This is a real pain, when
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you have linked lists which are shared by the 680x0 and the
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i596.
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Driver skeleton
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Written 1993 by Donald Becker.
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Copyright 1993 United States Government as represented by the Director,
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National Security Agency. This software may only be used and distributed
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according to the terms of the GNU General Public License as modified by SRC,
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incorporated herein by reference.
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The author may be reached as becker@scyld.com, or C/O
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Scyld Computing Corporation, 410 Severn Ave., Suite 210, Annapolis MD 21403
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/ptrace.h>
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#include <linux/errno.h>
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#include <linux/ioport.h>
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#include <linux/interrupt.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/skbuff.h>
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#include <linux/types.h>
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#include <linux/bitops.h>
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#include <linux/dma-mapping.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/pdc.h>
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#include <asm/parisc-device.h>
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#define LASI_82596_DRIVER_VERSION "LASI 82596 driver - Revision: 1.30"
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#define PA_I82596_RESET 0 /* Offsets relative to LASI-LAN-Addr.*/
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#define PA_CPU_PORT_L_ACCESS 4
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#define PA_CHANNEL_ATTENTION 8
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#define OPT_SWAP_PORT 0x0001 /* Need to wordswp on the MPU port */
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#define SYSBUS 0x0000006c
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/* big endian CPU, 82596 "big" endian mode */
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#define SWAP32(x) (((u32)(x)<<16) | ((((u32)(x)))>>16))
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#define SWAP16(x) (x)
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#define NONCOHERENT_DMA 1
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#include "lib82596.c"
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MODULE_AUTHOR("Richard Hirst");
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MODULE_DESCRIPTION("i82596 driver");
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MODULE_LICENSE("GPL");
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module_param(i596_debug, int, 0);
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MODULE_PARM_DESC(i596_debug, "lasi_82596 debug mask");
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static inline void ca(struct net_device *dev)
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{
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gsc_writel(0, dev->base_addr + PA_CHANNEL_ATTENTION);
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}
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static void mpu_port(struct net_device *dev, int c, dma_addr_t x)
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{
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struct i596_private *lp = netdev_priv(dev);
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u32 v = (u32) (c) | (u32) (x);
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u16 a, b;
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if (lp->options & OPT_SWAP_PORT) {
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a = v >> 16;
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b = v & 0xffff;
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} else {
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a = v & 0xffff;
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b = v >> 16;
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}
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gsc_writel(a, dev->base_addr + PA_CPU_PORT_L_ACCESS);
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if (!running_on_qemu)
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udelay(1);
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gsc_writel(b, dev->base_addr + PA_CPU_PORT_L_ACCESS);
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}
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#define LAN_PROM_ADDR 0xF0810000
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static int __init
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lan_init_chip(struct parisc_device *dev)
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{
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struct net_device *netdevice;
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struct i596_private *lp;
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int retval = -ENOMEM;
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u8 addr[ETH_ALEN];
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int i;
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if (!dev->irq) {
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printk(KERN_ERR "%s: IRQ not found for i82596 at 0x%lx\n",
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__FILE__, (unsigned long)dev->hpa.start);
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return -ENODEV;
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}
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printk(KERN_INFO "Found i82596 at 0x%lx, IRQ %d\n",
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(unsigned long)dev->hpa.start, dev->irq);
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netdevice = alloc_etherdev(sizeof(struct i596_private));
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if (!netdevice)
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return -ENOMEM;
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SET_NETDEV_DEV(netdevice, &dev->dev);
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parisc_set_drvdata (dev, netdevice);
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netdevice->base_addr = dev->hpa.start;
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netdevice->irq = dev->irq;
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if (pdc_lan_station_id(addr, netdevice->base_addr)) {
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for (i = 0; i < 6; i++) {
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addr[i] = gsc_readb(LAN_PROM_ADDR + i);
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}
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printk(KERN_INFO
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"%s: MAC of HP700 LAN read from EEPROM\n", __FILE__);
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}
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eth_hw_addr_set(netdevice, addr);
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lp = netdev_priv(netdevice);
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lp->options = dev->id.sversion == 0x72 ? OPT_SWAP_PORT : 0;
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lp->dma = dma_alloc_noncoherent(&dev->dev,
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sizeof(struct i596_dma), &lp->dma_addr,
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DMA_BIDIRECTIONAL, GFP_KERNEL);
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if (!lp->dma)
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goto out_free_netdev;
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retval = i82596_probe(netdevice);
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if (retval)
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goto out_free_dma;
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return 0;
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out_free_dma:
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dma_free_noncoherent(&dev->dev, sizeof(struct i596_dma),
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lp->dma, lp->dma_addr, DMA_BIDIRECTIONAL);
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out_free_netdev:
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free_netdev(netdevice);
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return retval;
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}
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static void __exit lan_remove_chip(struct parisc_device *pdev)
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{
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struct net_device *dev = parisc_get_drvdata(pdev);
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struct i596_private *lp = netdev_priv(dev);
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unregister_netdev (dev);
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dma_free_noncoherent(&pdev->dev, sizeof(struct i596_private), lp->dma,
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lp->dma_addr, DMA_BIDIRECTIONAL);
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free_netdev (dev);
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}
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static const struct parisc_device_id lan_tbl[] __initconst = {
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{ HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008a },
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{ HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00072 },
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{ 0, }
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};
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MODULE_DEVICE_TABLE(parisc, lan_tbl);
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static struct parisc_driver lan_driver __refdata = {
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.name = "lasi_82596",
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.id_table = lan_tbl,
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.probe = lan_init_chip,
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.remove = __exit_p(lan_remove_chip),
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};
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static int lasi_82596_init(void)
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{
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printk(KERN_INFO LASI_82596_DRIVER_VERSION "\n");
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return register_parisc_driver(&lan_driver);
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}
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module_init(lasi_82596_init);
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static void __exit lasi_82596_exit(void)
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{
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unregister_parisc_driver(&lan_driver);
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}
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module_exit(lasi_82596_exit);
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