1/* mvme147.c  : the  Linux/mvme147/lance ethernet driver
  2 *
  3 * Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk>
  4 * Based on the Sun Lance driver and the NetBSD HP Lance driver
  5 * Uses the generic 7990.c LANCE code.
  6 */
  7
  8#include <linux/module.h>
  9#include <linux/kernel.h>
 10#include <linux/types.h>
 11#include <linux/interrupt.h>
 12#include <linux/ioport.h>
 13#include <linux/string.h>
 14#include <linux/delay.h>
 15#include <linux/init.h>
 16#include <linux/errno.h>
 17#include <linux/gfp.h>
 18/* Used for the temporal inet entries and routing */
 19#include <linux/socket.h>
 20#include <linux/route.h>
 21#include <linux/netdevice.h>
 22#include <linux/etherdevice.h>
 23#include <linux/skbuff.h>
 24
 25#include <asm/io.h>
 26#include <asm/pgtable.h>
 27#include <asm/mvme147hw.h>
 28
 29/* We have 16834 bytes of RAM for the init block and buffers. This places
 30 * an upper limit on the number of buffers we can use. NetBSD uses 8 Rx
 31 * buffers and 2 Tx buffers.
 32 */
 33#define LANCE_LOG_TX_BUFFERS 1
 34#define LANCE_LOG_RX_BUFFERS 3
 35
 36#include "7990.h"                                 /* use generic LANCE code */
 37
 38/* Our private data structure */
 39struct m147lance_private {
 40	struct lance_private lance;
 41	unsigned long ram;
 42};
 43
 44/* function prototypes... This is easy because all the grot is in the
 45 * generic LANCE support. All we have to support is probing for boards,
 46 * plus board-specific init, open and close actions.
 47 * Oh, and we need to tell the generic code how to read and write LANCE registers...
 48 */
 49static int m147lance_open(struct net_device *dev);
 50static int m147lance_close(struct net_device *dev);
 51static void m147lance_writerap(struct lance_private *lp, unsigned short value);
 52static void m147lance_writerdp(struct lance_private *lp, unsigned short value);
 53static unsigned short m147lance_readrdp(struct lance_private *lp);
 54
 55typedef void (*writerap_t)(void *, unsigned short);
 56typedef void (*writerdp_t)(void *, unsigned short);
 57typedef unsigned short (*readrdp_t)(void *);
 58
 59static const struct net_device_ops lance_netdev_ops = {
 60	.ndo_open		= m147lance_open,
 61	.ndo_stop		= m147lance_close,
 62	.ndo_start_xmit		= lance_start_xmit,
 63	.ndo_set_rx_mode	= lance_set_multicast,
 64	.ndo_tx_timeout		= lance_tx_timeout,
 65	.ndo_change_mtu		= eth_change_mtu,
 66	.ndo_validate_addr	= eth_validate_addr,
 67	.ndo_set_mac_address	= eth_mac_addr,
 68};
 69
 70/* Initialise the one and only on-board 7990 */
 71struct net_device * __init mvme147lance_probe(int unit)
 72{
 73	struct net_device *dev;
 74	static int called;
 75	static const char name[] = "MVME147 LANCE";
 76	struct m147lance_private *lp;
 77	u_long *addr;
 78	u_long address;
 79	int err;
 80
 81	if (!MACH_IS_MVME147 || called)
 82		return ERR_PTR(-ENODEV);
 83	called++;
 84
 85	dev = alloc_etherdev(sizeof(struct m147lance_private));
 86	if (!dev)
 87		return ERR_PTR(-ENOMEM);
 88
 89	if (unit >= 0)
 90		sprintf(dev->name, "eth%d", unit);
 91
 92	/* Fill the dev fields */
 93	dev->base_addr = (unsigned long)MVME147_LANCE_BASE;
 94	dev->netdev_ops = &lance_netdev_ops;
 95	dev->dma = 0;
 96
 97	addr=(u_long *)ETHERNET_ADDRESS;
 98	address = *addr;
 99	dev->dev_addr[0]=0x08;
100	dev->dev_addr[1]=0x00;
101	dev->dev_addr[2]=0x3e;
102	address=address>>8;
103	dev->dev_addr[5]=address&0xff;
104	address=address>>8;
105	dev->dev_addr[4]=address&0xff;
106	address=address>>8;
107	dev->dev_addr[3]=address&0xff;
108
109	printk("%s: MVME147 at 0x%08lx, irq %d, "
110	       "Hardware Address %pM\n",
111	       dev->name, dev->base_addr, MVME147_LANCE_IRQ,
112	       dev->dev_addr);
113
114	lp = netdev_priv(dev);
115	lp->ram = __get_dma_pages(GFP_ATOMIC, 3);	/* 16K */
116	if (!lp->ram)
117	{
118		printk("%s: No memory for LANCE buffers\n", dev->name);
119		free_netdev(dev);
120		return ERR_PTR(-ENOMEM);
121	}
122
123	lp->lance.name = (char*)name;                   /* discards const, shut up gcc */
124	lp->lance.base = dev->base_addr;
125	lp->lance.init_block = (struct lance_init_block *)(lp->ram); /* CPU addr */
126	lp->lance.lance_init_block = (struct lance_init_block *)(lp->ram);                 /* LANCE addr of same RAM */
127	lp->lance.busmaster_regval = LE_C3_BSWP;        /* we're bigendian */
128	lp->lance.irq = MVME147_LANCE_IRQ;
129	lp->lance.writerap = (writerap_t)m147lance_writerap;
130	lp->lance.writerdp = (writerdp_t)m147lance_writerdp;
131	lp->lance.readrdp = (readrdp_t)m147lance_readrdp;
132	lp->lance.lance_log_rx_bufs = LANCE_LOG_RX_BUFFERS;
133	lp->lance.lance_log_tx_bufs = LANCE_LOG_TX_BUFFERS;
134	lp->lance.rx_ring_mod_mask = RX_RING_MOD_MASK;
135	lp->lance.tx_ring_mod_mask = TX_RING_MOD_MASK;
136
137	err = register_netdev(dev);
138	if (err) {
139		free_pages(lp->ram, 3);
140		free_netdev(dev);
141		return ERR_PTR(err);
142	}
143
144	return dev;
145}
146
147static void m147lance_writerap(struct lance_private *lp, unsigned short value)
148{
149	out_be16(lp->base + LANCE_RAP, value);
150}
151
152static void m147lance_writerdp(struct lance_private *lp, unsigned short value)
153{
154	out_be16(lp->base + LANCE_RDP, value);
155}
156
157static unsigned short m147lance_readrdp(struct lance_private *lp)
158{
159	return in_be16(lp->base + LANCE_RDP);
160}
161
162static int m147lance_open(struct net_device *dev)
163{
164	int status;
165
166	status = lance_open(dev);                 /* call generic lance open code */
167	if (status)
168		return status;
169	/* enable interrupts at board level. */
170	m147_pcc->lan_cntrl=0;       /* clear the interrupts (if any) */
171	m147_pcc->lan_cntrl=0x08 | 0x04;     /* Enable irq 4 */
172
173	return 0;
174}
175
176static int m147lance_close(struct net_device *dev)
177{
178	/* disable interrupts at boardlevel */
179	m147_pcc->lan_cntrl=0x0; /* disable interrupts */
180	lance_close(dev);
181	return 0;
182}
183
184#ifdef MODULE
185MODULE_LICENSE("GPL");
186
187static struct net_device *dev_mvme147_lance;
188int __init init_module(void)
189{
190	dev_mvme147_lance = mvme147lance_probe(-1);
191	if (IS_ERR(dev_mvme147_lance))
192		return PTR_ERR(dev_mvme147_lance);
193	return 0;
194}
195
196void __exit cleanup_module(void)
197{
198	struct m147lance_private *lp = netdev_priv(dev_mvme147_lance);
199	unregister_netdev(dev_mvme147_lance);
200	free_pages(lp->ram, 3);
201	free_netdev(dev_mvme147_lance);
202}
203
204#endif /* MODULE */