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 /* Used for the temporal inet entries and routing */
20 #include <linux/socket.h>
21 #include <linux/route.h>
22 #include <linux/netdevice.h>
23 #include <linux/etherdevice.h>
24 #include <linux/skbuff.h>
25
26 #include <asm/io.h>
27 #include <asm/pgtable.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(int unit)71 struct 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, Hardware Address %pM\n",
110 dev->name, dev->base_addr, MVME147_LANCE_IRQ,
111 dev->dev_addr);
112
113 lp = netdev_priv(dev);
114 lp->ram = __get_dma_pages(GFP_ATOMIC, 3); /* 32K */
115 if (!lp->ram) {
116 printk("%s: No memory for LANCE buffers\n", dev->name);
117 free_netdev(dev);
118 return ERR_PTR(-ENOMEM);
119 }
120
121 lp->lance.name = name;
122 lp->lance.base = dev->base_addr;
123 lp->lance.init_block = (struct lance_init_block *)(lp->ram); /* CPU addr */
124 lp->lance.lance_init_block = (struct lance_init_block *)(lp->ram); /* LANCE addr of same RAM */
125 lp->lance.busmaster_regval = LE_C3_BSWP; /* we're bigendian */
126 lp->lance.irq = MVME147_LANCE_IRQ;
127 lp->lance.writerap = (writerap_t)m147lance_writerap;
128 lp->lance.writerdp = (writerdp_t)m147lance_writerdp;
129 lp->lance.readrdp = (readrdp_t)m147lance_readrdp;
130 lp->lance.lance_log_rx_bufs = LANCE_LOG_RX_BUFFERS;
131 lp->lance.lance_log_tx_bufs = LANCE_LOG_TX_BUFFERS;
132 lp->lance.rx_ring_mod_mask = RX_RING_MOD_MASK;
133 lp->lance.tx_ring_mod_mask = TX_RING_MOD_MASK;
134
135 err = register_netdev(dev);
136 if (err) {
137 free_pages(lp->ram, 3);
138 free_netdev(dev);
139 return ERR_PTR(err);
140 }
141
142 return dev;
143 }
144
m147lance_writerap(struct lance_private * lp,unsigned short value)145 static void m147lance_writerap(struct lance_private *lp, unsigned short value)
146 {
147 out_be16(lp->base + LANCE_RAP, value);
148 }
149
m147lance_writerdp(struct lance_private * lp,unsigned short value)150 static void m147lance_writerdp(struct lance_private *lp, unsigned short value)
151 {
152 out_be16(lp->base + LANCE_RDP, value);
153 }
154
m147lance_readrdp(struct lance_private * lp)155 static unsigned short m147lance_readrdp(struct lance_private *lp)
156 {
157 return in_be16(lp->base + LANCE_RDP);
158 }
159
m147lance_open(struct net_device * dev)160 static int m147lance_open(struct net_device *dev)
161 {
162 int status;
163
164 status = lance_open(dev); /* call generic lance open code */
165 if (status)
166 return status;
167 /* enable interrupts at board level. */
168 m147_pcc->lan_cntrl = 0; /* clear the interrupts (if any) */
169 m147_pcc->lan_cntrl = 0x08 | 0x04; /* Enable irq 4 */
170
171 return 0;
172 }
173
m147lance_close(struct net_device * dev)174 static int m147lance_close(struct net_device *dev)
175 {
176 /* disable interrupts at boardlevel */
177 m147_pcc->lan_cntrl = 0x0; /* disable interrupts */
178 lance_close(dev);
179 return 0;
180 }
181
182 #ifdef MODULE
183 MODULE_LICENSE("GPL");
184
185 static struct net_device *dev_mvme147_lance;
init_module(void)186 int __init init_module(void)
187 {
188 dev_mvme147_lance = mvme147lance_probe(-1);
189 return PTR_ERR_OR_ZERO(dev_mvme147_lance);
190 }
191
cleanup_module(void)192 void __exit cleanup_module(void)
193 {
194 struct m147lance_private *lp = netdev_priv(dev_mvme147_lance);
195 unregister_netdev(dev_mvme147_lance);
196 free_pages(lp->ram, 3);
197 free_netdev(dev_mvme147_lance);
198 }
199
200 #endif /* MODULE */
201
