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