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 lp = netdev_priv(dev);
109 lp->ram = __get_dma_pages(GFP_ATOMIC, 3); /* 32K */
110 if (!lp->ram) {
111 printk("%s: No memory for LANCE buffers\n", dev->name);
112 free_netdev(dev);
113 return ERR_PTR(-ENOMEM);
114 }
115
116 lp->lance.name = name;
117 lp->lance.base = dev->base_addr;
118 lp->lance.init_block = (struct lance_init_block *)(lp->ram); /* CPU addr */
119 lp->lance.lance_init_block = (struct lance_init_block *)(lp->ram); /* LANCE addr of same RAM */
120 lp->lance.busmaster_regval = LE_C3_BSWP; /* we're bigendian */
121 lp->lance.irq = MVME147_LANCE_IRQ;
122 lp->lance.writerap = (writerap_t)m147lance_writerap;
123 lp->lance.writerdp = (writerdp_t)m147lance_writerdp;
124 lp->lance.readrdp = (readrdp_t)m147lance_readrdp;
125 lp->lance.lance_log_rx_bufs = LANCE_LOG_RX_BUFFERS;
126 lp->lance.lance_log_tx_bufs = LANCE_LOG_TX_BUFFERS;
127 lp->lance.rx_ring_mod_mask = RX_RING_MOD_MASK;
128 lp->lance.tx_ring_mod_mask = TX_RING_MOD_MASK;
129
130 err = register_netdev(dev);
131 if (err) {
132 free_pages(lp->ram, 3);
133 free_netdev(dev);
134 return ERR_PTR(err);
135 }
136
137 netdev_info(dev, "MVME147 at 0x%08lx, irq %d, Hardware Address %pM\n",
138 dev->base_addr, MVME147_LANCE_IRQ, dev->dev_addr);
139
140 return dev;
141 }
142
m147lance_writerap(struct lance_private * lp,unsigned short value)143 static void m147lance_writerap(struct lance_private *lp, unsigned short value)
144 {
145 out_be16(lp->base + LANCE_RAP, value);
146 }
147
m147lance_writerdp(struct lance_private * lp,unsigned short value)148 static void m147lance_writerdp(struct lance_private *lp, unsigned short value)
149 {
150 out_be16(lp->base + LANCE_RDP, value);
151 }
152
m147lance_readrdp(struct lance_private * lp)153 static unsigned short m147lance_readrdp(struct lance_private *lp)
154 {
155 return in_be16(lp->base + LANCE_RDP);
156 }
157
m147lance_open(struct net_device * dev)158 static int m147lance_open(struct net_device *dev)
159 {
160 int status;
161
162 status = lance_open(dev); /* call generic lance open code */
163 if (status)
164 return status;
165 /* enable interrupts at board level. */
166 m147_pcc->lan_cntrl = 0; /* clear the interrupts (if any) */
167 m147_pcc->lan_cntrl = 0x08 | 0x04; /* Enable irq 4 */
168
169 return 0;
170 }
171
m147lance_close(struct net_device * dev)172 static int m147lance_close(struct net_device *dev)
173 {
174 /* disable interrupts at boardlevel */
175 m147_pcc->lan_cntrl = 0x0; /* disable interrupts */
176 lance_close(dev);
177 return 0;
178 }
179
180 MODULE_DESCRIPTION("MVME147 LANCE Ethernet driver");
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