1// SPDX-License-Identifier: GPL-2.0-only
2/* mvme147.c  : the  Linux/mvme147/lance ethernet driver
3 *
4 * Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk>
5 * Based on the Sun Lance driver and the NetBSD HP Lance driver
6 * Uses the generic 7990.c LANCE code.
7 */
8
9#include <linux/module.h>
10#include <linux/kernel.h>
11#include <linux/types.h>
12#include <linux/interrupt.h>
13#include <linux/ioport.h>
14#include <linux/string.h>
15#include <linux/delay.h>
16#include <linux/init.h>
17#include <linux/errno.h>
18#include <linux/gfp.h>
19#include <linux/pgtable.h>
20/* Used for the temporal inet entries and routing */
21#include <linux/socket.h>
22#include <linux/route.h>
23#include <linux/netdevice.h>
24#include <linux/etherdevice.h>
25#include <linux/skbuff.h>
26
27#include <asm/io.h>
28#include <asm/mvme147hw.h>
29
30/* We have 32K of RAM for the init block and buffers. This places
31 * an upper limit on the number of buffers we can use. NetBSD uses 8 Rx
32 * buffers and 2 Tx buffers, it takes (8 + 2) * 1544 bytes.
33 */
34#define LANCE_LOG_TX_BUFFERS 1
35#define LANCE_LOG_RX_BUFFERS 3
36
37#include "7990.h"                                 /* use generic LANCE code */
38
39/* Our private data structure */
40struct m147lance_private {
41	struct lance_private lance;
42	unsigned long ram;
43};
44
45/* function prototypes... This is easy because all the grot is in the
46 * generic LANCE support. All we have to support is probing for boards,
47 * plus board-specific init, open and close actions.
48 * Oh, and we need to tell the generic code how to read and write LANCE registers...
49 */
50static int m147lance_open(struct net_device *dev);
51static int m147lance_close(struct net_device *dev);
52static void m147lance_writerap(struct lance_private *lp, unsigned short value);
53static void m147lance_writerdp(struct lance_private *lp, unsigned short value);
54static unsigned short m147lance_readrdp(struct lance_private *lp);
55
56typedef void (*writerap_t)(void *, unsigned short);
57typedef void (*writerdp_t)(void *, unsigned short);
58typedef unsigned short (*readrdp_t)(void *);
59
60static const struct net_device_ops lance_netdev_ops = {
61	.ndo_open		= m147lance_open,
62	.ndo_stop		= m147lance_close,
63	.ndo_start_xmit		= lance_start_xmit,
64	.ndo_set_rx_mode	= lance_set_multicast,
65	.ndo_tx_timeout		= lance_tx_timeout,
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 */
71static struct net_device * __init mvme147lance_probe(void)
72{
73	struct net_device *dev;
74	static int called;
75	static const char name[] = "MVME147 LANCE";
76	struct m147lance_private *lp;
77	u8 macaddr[ETH_ALEN];
78	u_long *addr;
79	u_long address;
80	int err;
81
82	if (!MACH_IS_MVME147 || called)
83		return ERR_PTR(-ENODEV);
84	called++;
85
86	dev = alloc_etherdev(sizeof(struct m147lance_private));
87	if (!dev)
88		return ERR_PTR(-ENOMEM);
89
90	/* Fill the dev fields */
91	dev->base_addr = (unsigned long)MVME147_LANCE_BASE;
92	dev->netdev_ops = &lance_netdev_ops;
93	dev->dma = 0;
94
95	addr = (u_long *)ETHERNET_ADDRESS;
96	address = *addr;
97	macaddr[0] = 0x08;
98	macaddr[1] = 0x00;
99	macaddr[2] = 0x3e;
100	address = address >> 8;
101	macaddr[5] = address&0xff;
102	address = address >> 8;
103	macaddr[4] = address&0xff;
104	address = address >> 8;
105	macaddr[3] = address&0xff;
106	eth_hw_addr_set(dev, macaddr);
107
108	printk("%s: MVME147 at 0x%08lx, irq %d, Hardware Address %pM\n",
109	       dev->name, dev->base_addr, MVME147_LANCE_IRQ,
110	       dev->dev_addr);
111
112	lp = netdev_priv(dev);
113	lp->ram = __get_dma_pages(GFP_ATOMIC, 3);	/* 32K */
114	if (!lp->ram) {
115		printk("%s: No memory for LANCE buffers\n", dev->name);
116		free_netdev(dev);
117		return ERR_PTR(-ENOMEM);
118	}
119
120	lp->lance.name = name;
121	lp->lance.base = dev->base_addr;
122	lp->lance.init_block = (struct lance_init_block *)(lp->ram); /* CPU addr */
123	lp->lance.lance_init_block = (struct lance_init_block *)(lp->ram);                 /* LANCE addr of same RAM */
124	lp->lance.busmaster_regval = LE_C3_BSWP;        /* we're bigendian */
125	lp->lance.irq = MVME147_LANCE_IRQ;
126	lp->lance.writerap = (writerap_t)m147lance_writerap;
127	lp->lance.writerdp = (writerdp_t)m147lance_writerdp;
128	lp->lance.readrdp = (readrdp_t)m147lance_readrdp;
129	lp->lance.lance_log_rx_bufs = LANCE_LOG_RX_BUFFERS;
130	lp->lance.lance_log_tx_bufs = LANCE_LOG_TX_BUFFERS;
131	lp->lance.rx_ring_mod_mask = RX_RING_MOD_MASK;
132	lp->lance.tx_ring_mod_mask = TX_RING_MOD_MASK;
133
134	err = register_netdev(dev);
135	if (err) {
136		free_pages(lp->ram, 3);
137		free_netdev(dev);
138		return ERR_PTR(err);
139	}
140
141	return dev;
142}
143
144static void m147lance_writerap(struct lance_private *lp, unsigned short value)
145{
146	out_be16(lp->base + LANCE_RAP, value);
147}
148
149static void m147lance_writerdp(struct lance_private *lp, unsigned short value)
150{
151	out_be16(lp->base + LANCE_RDP, value);
152}
153
154static unsigned short m147lance_readrdp(struct lance_private *lp)
155{
156	return in_be16(lp->base + LANCE_RDP);
157}
158
159static int m147lance_open(struct net_device *dev)
160{
161	int status;
162
163	status = lance_open(dev);                 /* call generic lance open code */
164	if (status)
165		return status;
166	/* enable interrupts at board level. */
167	m147_pcc->lan_cntrl = 0;       /* clear the interrupts (if any) */
168	m147_pcc->lan_cntrl = 0x08 | 0x04;     /* Enable irq 4 */
169
170	return 0;
171}
172
173static int m147lance_close(struct net_device *dev)
174{
175	/* disable interrupts at boardlevel */
176	m147_pcc->lan_cntrl = 0x0; /* disable interrupts */
177	lance_close(dev);
178	return 0;
179}
180
181MODULE_LICENSE("GPL");
182
183static struct net_device *dev_mvme147_lance;
184static int __init m147lance_init(void)
185{
186	dev_mvme147_lance = mvme147lance_probe();
187	return PTR_ERR_OR_ZERO(dev_mvme147_lance);
188}
189module_init(m147lance_init);
190
191static void __exit m147lance_exit(void)
192{
193	struct m147lance_private *lp = netdev_priv(dev_mvme147_lance);
194	unregister_netdev(dev_mvme147_lance);
195	free_pages(lp->ram, 3);
196	free_netdev(dev_mvme147_lance);
197}
198module_exit(m147lance_exit);
199