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 */
40 struct 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  */
50 static int m147lance_open(struct net_device *dev);
51 static int m147lance_close(struct net_device *dev);
52 static void m147lance_writerap(struct lance_private *lp, unsigned short value);
53 static void m147lance_writerdp(struct lance_private *lp, unsigned short value);
54 static unsigned short m147lance_readrdp(struct lance_private *lp);
55 
56 typedef void (*writerap_t)(void *, unsigned short);
57 typedef void (*writerdp_t)(void *, unsigned short);
58 typedef unsigned short (*readrdp_t)(void *);
59 
60 static 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 */
mvme147lance_probe(void)71 static 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 
m147lance_writerap(struct lance_private * lp,unsigned short value)144 static void m147lance_writerap(struct lance_private *lp, unsigned short value)
145 {
146 	out_be16(lp->base + LANCE_RAP, value);
147 }
148 
m147lance_writerdp(struct lance_private * lp,unsigned short value)149 static void m147lance_writerdp(struct lance_private *lp, unsigned short value)
150 {
151 	out_be16(lp->base + LANCE_RDP, value);
152 }
153 
m147lance_readrdp(struct lance_private * lp)154 static unsigned short m147lance_readrdp(struct lance_private *lp)
155 {
156 	return in_be16(lp->base + LANCE_RDP);
157 }
158 
m147lance_open(struct net_device * dev)159 static 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 
m147lance_close(struct net_device * dev)173 static 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 
181 MODULE_LICENSE("GPL");
182 
183 static struct net_device *dev_mvme147_lance;
m147lance_init(void)184 static int __init m147lance_init(void)
185 {
186 	dev_mvme147_lance = mvme147lance_probe();
187 	return PTR_ERR_OR_ZERO(dev_mvme147_lance);
188 }
189 module_init(m147lance_init);
190 
m147lance_exit(void)191 static 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 }
198 module_exit(m147lance_exit);
199