239 lines
6.6 KiB
C
239 lines
6.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* hplance.c : the Linux/hp300/lance ethernet driver
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*
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* Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk>
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* Based on the Sun Lance driver and the NetBSD HP Lance driver
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* Uses the generic 7990.c LANCE code.
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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/types.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <linux/string.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/pgtable.h>
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/* Used for the temporal inet entries and routing */
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#include <linux/socket.h>
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#include <linux/route.h>
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#include <linux/dio.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 <asm/io.h>
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#include "hplance.h"
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/* We have 16392 bytes of RAM for the init block and buffers. This places
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* an upper limit on the number of buffers we can use. NetBSD uses 8 Rx
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* buffers and 2 Tx buffers, it takes (8 + 2) * 1544 bytes.
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*/
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#define LANCE_LOG_TX_BUFFERS 1
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#define LANCE_LOG_RX_BUFFERS 3
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#include "7990.h" /* use generic LANCE code */
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/* Our private data structure */
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struct hplance_private {
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struct lance_private lance;
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};
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/* function prototypes... This is easy because all the grot is in the
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* generic LANCE support. All we have to support is probing for boards,
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* plus board-specific init, open and close actions.
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* Oh, and we need to tell the generic code how to read and write LANCE registers...
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*/
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static int hplance_init_one(struct dio_dev *d, const struct dio_device_id *ent);
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static void hplance_init(struct net_device *dev, struct dio_dev *d);
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static void hplance_remove_one(struct dio_dev *d);
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static void hplance_writerap(void *priv, unsigned short value);
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static void hplance_writerdp(void *priv, unsigned short value);
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static unsigned short hplance_readrdp(void *priv);
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static int hplance_open(struct net_device *dev);
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static int hplance_close(struct net_device *dev);
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static struct dio_device_id hplance_dio_tbl[] = {
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{ DIO_ID_LAN },
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{ 0 }
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};
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static struct dio_driver hplance_driver = {
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.name = "hplance",
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.id_table = hplance_dio_tbl,
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.probe = hplance_init_one,
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.remove = hplance_remove_one,
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};
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static const struct net_device_ops hplance_netdev_ops = {
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.ndo_open = hplance_open,
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.ndo_stop = hplance_close,
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.ndo_start_xmit = lance_start_xmit,
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.ndo_set_rx_mode = lance_set_multicast,
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.ndo_validate_addr = eth_validate_addr,
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.ndo_set_mac_address = eth_mac_addr,
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#ifdef CONFIG_NET_POLL_CONTROLLER
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.ndo_poll_controller = lance_poll,
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#endif
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};
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/* Find all the HP Lance boards and initialise them... */
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static int hplance_init_one(struct dio_dev *d, const struct dio_device_id *ent)
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{
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struct net_device *dev;
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int err = -ENOMEM;
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dev = alloc_etherdev(sizeof(struct hplance_private));
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if (!dev)
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goto out;
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err = -EBUSY;
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if (!request_mem_region(dio_resource_start(d),
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dio_resource_len(d), d->name))
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goto out_free_netdev;
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hplance_init(dev, d);
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err = register_netdev(dev);
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if (err)
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goto out_release_mem_region;
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dio_set_drvdata(d, dev);
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printk(KERN_INFO "%s: %s; select code %d, addr %pM, irq %d\n",
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dev->name, d->name, d->scode, dev->dev_addr, d->ipl);
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return 0;
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out_release_mem_region:
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release_mem_region(dio_resource_start(d), dio_resource_len(d));
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out_free_netdev:
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free_netdev(dev);
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out:
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return err;
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}
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static void hplance_remove_one(struct dio_dev *d)
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{
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struct net_device *dev = dio_get_drvdata(d);
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unregister_netdev(dev);
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release_mem_region(dio_resource_start(d), dio_resource_len(d));
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free_netdev(dev);
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}
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/* Initialise a single lance board at the given DIO device */
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static void hplance_init(struct net_device *dev, struct dio_dev *d)
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{
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unsigned long va = (d->resource.start + DIO_VIRADDRBASE);
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struct hplance_private *lp;
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u8 addr[ETH_ALEN];
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int i;
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/* reset the board */
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out_8(va + DIO_IDOFF, 0xff);
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udelay(100); /* ariba! ariba! udelay! udelay! */
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/* Fill the dev fields */
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dev->base_addr = va;
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dev->netdev_ops = &hplance_netdev_ops;
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dev->dma = 0;
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for (i = 0; i < 6; i++) {
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/* The NVRAM holds our ethernet address, one nibble per byte,
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* at bytes NVRAMOFF+1,3,5,7,9...
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*/
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addr[i] = ((in_8(va + HPLANCE_NVRAMOFF + i*4 + 1) & 0xF) << 4)
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| (in_8(va + HPLANCE_NVRAMOFF + i*4 + 3) & 0xF);
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}
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eth_hw_addr_set(dev, addr);
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lp = netdev_priv(dev);
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lp->lance.name = d->name;
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lp->lance.base = va;
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lp->lance.init_block = (struct lance_init_block *)(va + HPLANCE_MEMOFF); /* CPU addr */
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lp->lance.lance_init_block = NULL; /* LANCE addr of same RAM */
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lp->lance.busmaster_regval = LE_C3_BSWP; /* we're bigendian */
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lp->lance.irq = d->ipl;
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lp->lance.writerap = hplance_writerap;
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lp->lance.writerdp = hplance_writerdp;
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lp->lance.readrdp = hplance_readrdp;
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lp->lance.lance_log_rx_bufs = LANCE_LOG_RX_BUFFERS;
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lp->lance.lance_log_tx_bufs = LANCE_LOG_TX_BUFFERS;
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lp->lance.rx_ring_mod_mask = RX_RING_MOD_MASK;
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lp->lance.tx_ring_mod_mask = TX_RING_MOD_MASK;
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}
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/* This is disgusting. We have to check the DIO status register for ack every
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* time we read or write the LANCE registers.
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*/
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static void hplance_writerap(void *priv, unsigned short value)
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{
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struct lance_private *lp = (struct lance_private *)priv;
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do {
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out_be16(lp->base + HPLANCE_REGOFF + LANCE_RAP, value);
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} while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
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}
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static void hplance_writerdp(void *priv, unsigned short value)
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{
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struct lance_private *lp = (struct lance_private *)priv;
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do {
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out_be16(lp->base + HPLANCE_REGOFF + LANCE_RDP, value);
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} while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
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}
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static unsigned short hplance_readrdp(void *priv)
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{
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struct lance_private *lp = (struct lance_private *)priv;
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__u16 value;
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do {
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value = in_be16(lp->base + HPLANCE_REGOFF + LANCE_RDP);
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} while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
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return value;
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}
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static int hplance_open(struct net_device *dev)
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{
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int status;
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struct lance_private *lp = netdev_priv(dev);
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status = lance_open(dev); /* call generic lance open code */
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if (status)
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return status;
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/* enable interrupts at board level. */
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out_8(lp->base + HPLANCE_STATUS, LE_IE);
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return 0;
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}
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static int hplance_close(struct net_device *dev)
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{
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struct lance_private *lp = netdev_priv(dev);
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out_8(lp->base + HPLANCE_STATUS, 0); /* disable interrupts at boardlevel */
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lance_close(dev);
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return 0;
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}
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static int __init hplance_init_module(void)
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{
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return dio_register_driver(&hplance_driver);
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}
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static void __exit hplance_cleanup_module(void)
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{
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dio_unregister_driver(&hplance_driver);
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}
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module_init(hplance_init_module);
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module_exit(hplance_cleanup_module);
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MODULE_DESCRIPTION("HP300 on-board LANCE Ethernet driver");
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MODULE_LICENSE("GPL");
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