500 строки
15 KiB
C
500 строки
15 KiB
C
/* hp-plus.c: A HP PCLAN/plus ethernet driver for linux. */
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/*
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Written 1994 by Donald Becker.
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This driver is for the Hewlett Packard PC LAN (27***) plus ethercards.
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These cards are sold under several model numbers, usually 2724*.
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This software may be used and distributed according to the terms
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of the GNU General Public License, 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
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410 Severn Ave., Suite 210
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Annapolis MD 21403
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As is often the case, a great deal of credit is owed to Russ Nelson.
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The Crynwr packet driver was my primary source of HP-specific
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programming information.
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*/
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static const char version[] =
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"hp-plus.c:v1.10 9/24/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";
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#include <linux/module.h>
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#include <linux/string.h> /* Important -- this inlines word moves. */
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/ioport.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/delay.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include "8390.h"
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#define DRV_NAME "hp-plus"
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/* A zero-terminated list of I/O addresses to be probed. */
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static unsigned int hpplus_portlist[] __initdata =
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{0x200, 0x240, 0x280, 0x2C0, 0x300, 0x320, 0x340, 0};
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/*
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The HP EtherTwist chip implementation is a fairly routine DP8390
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implementation. It allows both shared memory and programmed-I/O buffer
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access, using a custom interface for both. The programmed-I/O mode is
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entirely implemented in the HP EtherTwist chip, bypassing the problem
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ridden built-in 8390 facilities used on NE2000 designs. The shared
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memory mode is likewise special, with an offset register used to make
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packets appear at the shared memory base. Both modes use a base and bounds
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page register to hide the Rx ring buffer wrap -- a packet that spans the
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end of physical buffer memory appears continuous to the driver. (c.f. the
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3c503 and Cabletron E2100)
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A special note: the internal buffer of the board is only 8 bits wide.
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This lays several nasty traps for the unaware:
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- the 8390 must be programmed for byte-wide operations
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- all I/O and memory operations must work on whole words (the access
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latches are serially preloaded and have no byte-swapping ability).
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This board is laid out in I/O space much like the earlier HP boards:
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the first 16 locations are for the board registers, and the second 16 are
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for the 8390. The board is easy to identify, with both a dedicated 16 bit
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ID register and a constant 0x530* value in the upper bits of the paging
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register.
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*/
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#define HP_ID 0x00 /* ID register, always 0x4850. */
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#define HP_PAGING 0x02 /* Registers visible @ 8-f, see PageName. */
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#define HPP_OPTION 0x04 /* Bitmapped options, see HP_Option. */
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#define HPP_OUT_ADDR 0x08 /* I/O output location in Perf_Page. */
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#define HPP_IN_ADDR 0x0A /* I/O input location in Perf_Page. */
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#define HP_DATAPORT 0x0c /* I/O data transfer in Perf_Page. */
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#define NIC_OFFSET 0x10 /* Offset to the 8390 registers. */
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#define HP_IO_EXTENT 32
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#define HP_START_PG 0x00 /* First page of TX buffer */
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#define HP_STOP_PG 0x80 /* Last page +1 of RX ring */
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/* The register set selected in HP_PAGING. */
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enum PageName {
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Perf_Page = 0, /* Normal operation. */
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MAC_Page = 1, /* The ethernet address (+checksum). */
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HW_Page = 2, /* EEPROM-loaded hardware parameters. */
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LAN_Page = 4, /* Transceiver selection, testing, etc. */
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ID_Page = 6 };
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/* The bit definitions for the HPP_OPTION register. */
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enum HP_Option {
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NICReset = 1, ChipReset = 2, /* Active low, really UNreset. */
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EnableIRQ = 4, FakeIntr = 8, BootROMEnb = 0x10, IOEnb = 0x20,
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MemEnable = 0x40, ZeroWait = 0x80, MemDisable = 0x1000, };
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static int hpp_probe1(struct net_device *dev, int ioaddr);
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static void hpp_reset_8390(struct net_device *dev);
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static int hpp_open(struct net_device *dev);
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static int hpp_close(struct net_device *dev);
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static void hpp_mem_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 hpp_mem_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 hpp_mem_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
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int ring_page);
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static void hpp_io_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 hpp_io_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 hpp_io_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
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int ring_page);
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/* Probe a list of addresses for an HP LAN+ adaptor.
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This routine is almost boilerplate. */
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static int __init do_hpp_probe(struct net_device *dev)
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{
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int i;
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int base_addr = dev->base_addr;
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int irq = dev->irq;
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SET_MODULE_OWNER(dev);
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if (base_addr > 0x1ff) /* Check a single specified location. */
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return hpp_probe1(dev, base_addr);
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else if (base_addr != 0) /* Don't probe at all. */
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return -ENXIO;
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for (i = 0; hpplus_portlist[i]; i++) {
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if (hpp_probe1(dev, hpplus_portlist[i]) == 0)
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return 0;
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dev->irq = irq;
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}
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return -ENODEV;
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}
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#ifndef MODULE
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struct net_device * __init hp_plus_probe(int unit)
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{
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struct net_device *dev = alloc_ei_netdev();
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int err;
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if (!dev)
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return ERR_PTR(-ENOMEM);
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sprintf(dev->name, "eth%d", unit);
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netdev_boot_setup_check(dev);
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err = do_hpp_probe(dev);
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if (err)
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goto out;
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return dev;
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out:
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free_netdev(dev);
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return ERR_PTR(err);
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}
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#endif
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/* Do the interesting part of the probe at a single address. */
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static int __init hpp_probe1(struct net_device *dev, int ioaddr)
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{
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int i, retval;
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unsigned char checksum = 0;
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const char name[] = "HP-PC-LAN+";
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int mem_start;
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static unsigned version_printed;
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if (!request_region(ioaddr, HP_IO_EXTENT, DRV_NAME))
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return -EBUSY;
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/* Check for the HP+ signature, 50 48 0x 53. */
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if (inw(ioaddr + HP_ID) != 0x4850
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|| (inw(ioaddr + HP_PAGING) & 0xfff0) != 0x5300) {
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retval = -ENODEV;
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goto out;
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}
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if (ei_debug && version_printed++ == 0)
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printk(version);
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printk("%s: %s at %#3x,", dev->name, name, ioaddr);
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/* Retrieve and checksum the station address. */
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outw(MAC_Page, ioaddr + HP_PAGING);
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for(i = 0; i < ETHER_ADDR_LEN; i++) {
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unsigned char inval = inb(ioaddr + 8 + i);
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dev->dev_addr[i] = inval;
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checksum += inval;
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printk(" %2.2x", inval);
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}
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checksum += inb(ioaddr + 14);
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if (checksum != 0xff) {
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printk(" bad checksum %2.2x.\n", checksum);
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retval = -ENODEV;
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goto out;
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} else {
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/* Point at the Software Configuration Flags. */
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outw(ID_Page, ioaddr + HP_PAGING);
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printk(" ID %4.4x", inw(ioaddr + 12));
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}
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/* Read the IRQ line. */
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outw(HW_Page, ioaddr + HP_PAGING);
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{
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int irq = inb(ioaddr + 13) & 0x0f;
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int option = inw(ioaddr + HPP_OPTION);
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dev->irq = irq;
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if (option & MemEnable) {
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mem_start = inw(ioaddr + 9) << 8;
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printk(", IRQ %d, memory address %#x.\n", irq, mem_start);
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} else {
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mem_start = 0;
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printk(", IRQ %d, programmed-I/O mode.\n", irq);
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}
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}
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/* Set the wrap registers for string I/O reads. */
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outw((HP_START_PG + TX_PAGES/2) | ((HP_STOP_PG - 1) << 8), ioaddr + 14);
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/* Set the base address to point to the NIC, not the "real" base! */
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dev->base_addr = ioaddr + NIC_OFFSET;
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dev->open = &hpp_open;
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dev->stop = &hpp_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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ei_status.name = name;
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ei_status.word16 = 0; /* Agggghhhhh! Debug time: 2 days! */
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ei_status.tx_start_page = HP_START_PG;
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ei_status.rx_start_page = HP_START_PG + TX_PAGES/2;
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ei_status.stop_page = HP_STOP_PG;
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ei_status.reset_8390 = &hpp_reset_8390;
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ei_status.block_input = &hpp_io_block_input;
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ei_status.block_output = &hpp_io_block_output;
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ei_status.get_8390_hdr = &hpp_io_get_8390_hdr;
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/* Check if the memory_enable flag is set in the option register. */
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if (mem_start) {
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ei_status.block_input = &hpp_mem_block_input;
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ei_status.block_output = &hpp_mem_block_output;
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ei_status.get_8390_hdr = &hpp_mem_get_8390_hdr;
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dev->mem_start = mem_start;
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ei_status.mem = ioremap(mem_start,
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(HP_STOP_PG - HP_START_PG)*256);
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if (!ei_status.mem) {
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retval = -ENOMEM;
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goto out;
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}
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ei_status.rmem_start = dev->mem_start + TX_PAGES/2*256;
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dev->mem_end = ei_status.rmem_end
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= dev->mem_start + (HP_STOP_PG - HP_START_PG)*256;
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}
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outw(Perf_Page, ioaddr + HP_PAGING);
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NS8390_init(dev, 0);
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/* Leave the 8390 and HP chip reset. */
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outw(inw(ioaddr + HPP_OPTION) & ~EnableIRQ, ioaddr + HPP_OPTION);
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retval = register_netdev(dev);
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if (retval)
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goto out1;
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return 0;
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out1:
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iounmap(ei_status.mem);
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out:
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release_region(ioaddr, HP_IO_EXTENT);
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return retval;
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}
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static int
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hpp_open(struct net_device *dev)
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{
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int ioaddr = dev->base_addr - NIC_OFFSET;
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int option_reg;
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int retval;
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if ((retval = request_irq(dev->irq, ei_interrupt, 0, dev->name, dev))) {
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return retval;
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}
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/* Reset the 8390 and HP chip. */
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option_reg = inw(ioaddr + HPP_OPTION);
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outw(option_reg & ~(NICReset + ChipReset), ioaddr + HPP_OPTION);
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udelay(5);
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/* Unreset the board and enable interrupts. */
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outw(option_reg | (EnableIRQ + NICReset + ChipReset), ioaddr + HPP_OPTION);
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/* Set the wrap registers for programmed-I/O operation. */
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outw(HW_Page, ioaddr + HP_PAGING);
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outw((HP_START_PG + TX_PAGES/2) | ((HP_STOP_PG - 1) << 8), ioaddr + 14);
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/* Select the operational page. */
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outw(Perf_Page, ioaddr + HP_PAGING);
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ei_open(dev);
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return 0;
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}
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static int
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hpp_close(struct net_device *dev)
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{
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int ioaddr = dev->base_addr - NIC_OFFSET;
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int option_reg = inw(ioaddr + HPP_OPTION);
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free_irq(dev->irq, dev);
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ei_close(dev);
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outw((option_reg & ~EnableIRQ) | MemDisable | NICReset | ChipReset,
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ioaddr + HPP_OPTION);
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return 0;
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}
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static void
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hpp_reset_8390(struct net_device *dev)
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{
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int ioaddr = dev->base_addr - NIC_OFFSET;
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int option_reg = inw(ioaddr + HPP_OPTION);
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if (ei_debug > 1) printk("resetting the 8390 time=%ld...", jiffies);
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outw(option_reg & ~(NICReset + ChipReset), ioaddr + HPP_OPTION);
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/* Pause a few cycles for the hardware reset to take place. */
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udelay(5);
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ei_status.txing = 0;
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outw(option_reg | (EnableIRQ + NICReset + ChipReset), ioaddr + HPP_OPTION);
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udelay(5);
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if ((inb_p(ioaddr+NIC_OFFSET+EN0_ISR) & ENISR_RESET) == 0)
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printk("%s: hp_reset_8390() did not complete.\n", dev->name);
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if (ei_debug > 1) printk("8390 reset done (%ld).", jiffies);
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return;
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}
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/* The programmed-I/O version of reading the 4 byte 8390 specific header.
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Note that transfer with the EtherTwist+ must be on word boundaries. */
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static void
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hpp_io_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
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{
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int ioaddr = dev->base_addr - NIC_OFFSET;
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outw((ring_page<<8), ioaddr + HPP_IN_ADDR);
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insw(ioaddr + HP_DATAPORT, hdr, sizeof(struct e8390_pkt_hdr)>>1);
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}
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/* Block input and output, similar to the Crynwr packet driver. */
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static void
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hpp_io_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
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{
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int ioaddr = dev->base_addr - NIC_OFFSET;
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char *buf = skb->data;
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outw(ring_offset, ioaddr + HPP_IN_ADDR);
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insw(ioaddr + HP_DATAPORT, buf, count>>1);
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if (count & 0x01)
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buf[count-1] = inw(ioaddr + HP_DATAPORT);
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}
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/* The corresponding shared memory versions of the above 2 functions. */
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static void
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hpp_mem_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
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{
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int ioaddr = dev->base_addr - NIC_OFFSET;
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int option_reg = inw(ioaddr + HPP_OPTION);
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outw((ring_page<<8), ioaddr + HPP_IN_ADDR);
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outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
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memcpy_fromio(hdr, ei_status.mem, sizeof(struct e8390_pkt_hdr));
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outw(option_reg, ioaddr + HPP_OPTION);
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hdr->count = (le16_to_cpu(hdr->count) + 3) & ~3; /* Round up allocation. */
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}
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static void
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hpp_mem_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
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{
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int ioaddr = dev->base_addr - NIC_OFFSET;
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int option_reg = inw(ioaddr + HPP_OPTION);
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outw(ring_offset, ioaddr + HPP_IN_ADDR);
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outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
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/* Caution: this relies on get_8390_hdr() rounding up count!
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Also note that we *can't* use eth_io_copy_and_sum() because
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it will not always copy "count" bytes (e.g. padded IP). */
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memcpy_fromio(skb->data, ei_status.mem, count);
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outw(option_reg, ioaddr + HPP_OPTION);
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}
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/* A special note: we *must* always transfer >=16 bit words.
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It's always safe to round up, so we do. */
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static void
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hpp_io_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 ioaddr = dev->base_addr - NIC_OFFSET;
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outw(start_page << 8, ioaddr + HPP_OUT_ADDR);
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outsl(ioaddr + HP_DATAPORT, buf, (count+3)>>2);
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return;
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}
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static void
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hpp_mem_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 ioaddr = dev->base_addr - NIC_OFFSET;
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int option_reg = inw(ioaddr + HPP_OPTION);
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outw(start_page << 8, ioaddr + HPP_OUT_ADDR);
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outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
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memcpy_toio(ei_status.mem, buf, (count + 3) & ~3);
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outw(option_reg, ioaddr + HPP_OPTION);
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return;
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}
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#ifdef MODULE
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#define MAX_HPP_CARDS 4 /* Max number of HPP cards per module */
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static struct net_device *dev_hpp[MAX_HPP_CARDS];
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static int io[MAX_HPP_CARDS];
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static int irq[MAX_HPP_CARDS];
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module_param_array(io, int, NULL, 0);
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module_param_array(irq, int, NULL, 0);
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MODULE_PARM_DESC(io, "I/O port address(es)");
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MODULE_PARM_DESC(irq, "IRQ number(s); ignored if properly detected");
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MODULE_DESCRIPTION("HP PC-LAN+ ISA ethernet driver");
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MODULE_LICENSE("GPL");
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/* This is set up so that only a single autoprobe takes place per call.
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ISA device autoprobes on a running machine are not recommended. */
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int
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init_module(void)
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{
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struct net_device *dev;
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int this_dev, found = 0;
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for (this_dev = 0; this_dev < MAX_HPP_CARDS; this_dev++) {
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if (io[this_dev] == 0) {
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if (this_dev != 0) break; /* only autoprobe 1st one */
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printk(KERN_NOTICE "hp-plus.c: Presently autoprobing (not recommended) for a single card.\n");
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}
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dev = alloc_ei_netdev();
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if (!dev)
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||
break;
|
||
dev->irq = irq[this_dev];
|
||
dev->base_addr = io[this_dev];
|
||
if (do_hpp_probe(dev) == 0) {
|
||
dev_hpp[found++] = dev;
|
||
continue;
|
||
}
|
||
free_netdev(dev);
|
||
printk(KERN_WARNING "hp-plus.c: No HP-Plus card found (i/o = 0x%x).\n", io[this_dev]);
|
||
break;
|
||
}
|
||
if (found)
|
||
return 0;
|
||
return -ENXIO;
|
||
}
|
||
|
||
static void cleanup_card(struct net_device *dev)
|
||
{
|
||
/* NB: hpp_close() handles free_irq */
|
||
iounmap(ei_status.mem);
|
||
release_region(dev->base_addr - NIC_OFFSET, HP_IO_EXTENT);
|
||
}
|
||
|
||
void
|
||
cleanup_module(void)
|
||
{
|
||
int this_dev;
|
||
|
||
for (this_dev = 0; this_dev < MAX_HPP_CARDS; this_dev++) {
|
||
struct net_device *dev = dev_hpp[this_dev];
|
||
if (dev) {
|
||
unregister_netdev(dev);
|
||
cleanup_card(dev);
|
||
free_netdev(dev);
|
||
}
|
||
}
|
||
}
|
||
#endif /* MODULE */
|