1 /* mvme147.c : the Linux/mvme147/lance ethernet driver
2 *
3 * Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk>
4 * Based on the Sun Lance driver and the NetBSD HP Lance driver
5 * Uses the generic 7990.c LANCE code.
6 */
7
8 #include <linux/module.h>
9 #include <linux/kernel.h>
10 #include <linux/types.h>
11 #include <linux/interrupt.h>
12 #include <linux/ioport.h>
13 #include <linux/slab.h>
14 #include <linux/string.h>
15 #include <linux/delay.h>
16 #include <linux/init.h>
17 #include <linux/errno.h>
18 /* Used for the temporal inet entries and routing */
19 #include <linux/socket.h>
20 #include <linux/route.h>
21 #include <linux/netdevice.h>
22 #include <linux/etherdevice.h>
23 #include <linux/skbuff.h>
24
25 #include <asm/system.h>
26 #include <asm/io.h>
27 #include <asm/pgtable.h>
28 #include <asm/mvme147hw.h>
29
30 /* We have 16834 bytes 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.
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 /* Initialise the one and only on-board 7990 */
mvme147lance_probe(int unit)61 struct net_device * __init mvme147lance_probe(int unit)
62 {
63 struct net_device *dev;
64 static int called;
65 static const char name[] = "MVME147 LANCE";
66 struct m147lance_private *lp;
67 u_long *addr;
68 u_long address;
69 int err;
70
71 if (!MACH_IS_MVME147 || called)
72 return ERR_PTR(-ENODEV);
73 called++;
74
75 dev = alloc_etherdev(sizeof(struct m147lance_private));
76 if (!dev)
77 return ERR_PTR(-ENOMEM);
78
79 if (unit >= 0)
80 sprintf(dev->name, "eth%d", unit);
81
82 /* Fill the dev fields */
83 dev->base_addr = (unsigned long)MVME147_LANCE_BASE;
84 dev->open = &m147lance_open;
85 dev->stop = &m147lance_close;
86 dev->hard_start_xmit = &lance_start_xmit;
87 dev->set_multicast_list = &lance_set_multicast;
88 dev->tx_timeout = &lance_tx_timeout;
89 dev->dma = 0;
90
91 addr=(u_long *)ETHERNET_ADDRESS;
92 address = *addr;
93 dev->dev_addr[0]=0x08;
94 dev->dev_addr[1]=0x00;
95 dev->dev_addr[2]=0x3e;
96 address=address>>8;
97 dev->dev_addr[5]=address&0xff;
98 address=address>>8;
99 dev->dev_addr[4]=address&0xff;
100 address=address>>8;
101 dev->dev_addr[3]=address&0xff;
102
103 printk("%s: MVME147 at 0x%08lx, irq %d, "
104 "Hardware Address %pM\n",
105 dev->name, dev->base_addr, MVME147_LANCE_IRQ,
106 dev->dev_addr);
107
108 lp = netdev_priv(dev);
109 lp->ram = __get_dma_pages(GFP_ATOMIC, 3); /* 16K */
110 if (!lp->ram)
111 {
112 printk("%s: No memory for LANCE buffers\n", dev->name);
113 free_netdev(dev);
114 return ERR_PTR(-ENOMEM);
115 }
116
117 lp->lance.name = (char*)name; /* discards const, shut up gcc */
118 lp->lance.base = dev->base_addr;
119 lp->lance.init_block = (struct lance_init_block *)(lp->ram); /* CPU addr */
120 lp->lance.lance_init_block = (struct lance_init_block *)(lp->ram); /* LANCE addr of same RAM */
121 lp->lance.busmaster_regval = LE_C3_BSWP; /* we're bigendian */
122 lp->lance.irq = MVME147_LANCE_IRQ;
123 lp->lance.writerap = (writerap_t)m147lance_writerap;
124 lp->lance.writerdp = (writerdp_t)m147lance_writerdp;
125 lp->lance.readrdp = (readrdp_t)m147lance_readrdp;
126 lp->lance.lance_log_rx_bufs = LANCE_LOG_RX_BUFFERS;
127 lp->lance.lance_log_tx_bufs = LANCE_LOG_TX_BUFFERS;
128 lp->lance.rx_ring_mod_mask = RX_RING_MOD_MASK;
129 lp->lance.tx_ring_mod_mask = TX_RING_MOD_MASK;
130
131 err = register_netdev(dev);
132 if (err) {
133 free_pages(lp->ram, 3);
134 free_netdev(dev);
135 return ERR_PTR(err);
136 }
137
138 return dev;
139 }
140
m147lance_writerap(struct lance_private * lp,unsigned short value)141 static void m147lance_writerap(struct lance_private *lp, unsigned short value)
142 {
143 out_be16(lp->base + LANCE_RAP, value);
144 }
145
m147lance_writerdp(struct lance_private * lp,unsigned short value)146 static void m147lance_writerdp(struct lance_private *lp, unsigned short value)
147 {
148 out_be16(lp->base + LANCE_RDP, value);
149 }
150
m147lance_readrdp(struct lance_private * lp)151 static unsigned short m147lance_readrdp(struct lance_private *lp)
152 {
153 return in_be16(lp->base + LANCE_RDP);
154 }
155
m147lance_open(struct net_device * dev)156 static int m147lance_open(struct net_device *dev)
157 {
158 int status;
159
160 status = lance_open(dev); /* call generic lance open code */
161 if (status)
162 return status;
163 /* enable interrupts at board level. */
164 m147_pcc->lan_cntrl=0; /* clear the interrupts (if any) */
165 m147_pcc->lan_cntrl=0x08 | 0x04; /* Enable irq 4 */
166
167 return 0;
168 }
169
m147lance_close(struct net_device * dev)170 static int m147lance_close(struct net_device *dev)
171 {
172 /* disable interrupts at boardlevel */
173 m147_pcc->lan_cntrl=0x0; /* disable interrupts */
174 lance_close(dev);
175 return 0;
176 }
177
178 #ifdef MODULE
179 MODULE_LICENSE("GPL");
180
181 static struct net_device *dev_mvme147_lance;
init_module(void)182 int __init init_module(void)
183 {
184 dev_mvme147_lance = mvme147lance_probe(-1);
185 if (IS_ERR(dev_mvme147_lance))
186 return PTR_ERR(dev_mvme147_lance);
187 return 0;
188 }
189
cleanup_module(void)190 void __exit cleanup_module(void)
191 {
192 struct m147lance_private *lp = netdev_priv(dev_mvme147_lance);
193 unregister_netdev(dev_mvme147_lance);
194 free_pages(lp->ram, 3);
195 free_netdev(dev_mvme147_lance);
196 }
197
198 #endif /* MODULE */
199