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