Root/drivers/net/mvme147.c

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 */
40struct 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 */
50static int m147lance_open(struct net_device *dev);
51static int m147lance_close(struct net_device *dev);
52static void m147lance_writerap(struct lance_private *lp, unsigned short value);
53static void m147lance_writerdp(struct lance_private *lp, unsigned short value);
54static unsigned short m147lance_readrdp(struct lance_private *lp);
55
56typedef void (*writerap_t)(void *, unsigned short);
57typedef void (*writerdp_t)(void *, unsigned short);
58typedef unsigned short (*readrdp_t)(void *);
59
60static 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_multicast_list = lance_set_multicast,
65    .ndo_tx_timeout = lance_tx_timeout,
66    .ndo_change_mtu = eth_change_mtu,
67    .ndo_validate_addr = eth_validate_addr,
68    .ndo_set_mac_address = eth_mac_addr,
69};
70
71/* Initialise the one and only on-board 7990 */
72struct net_device * __init mvme147lance_probe(int unit)
73{
74    struct net_device *dev;
75    static int called;
76    static const char name[] = "MVME147 LANCE";
77    struct m147lance_private *lp;
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    if (unit >= 0)
91        sprintf(dev->name, "eth%d", unit);
92
93    /* Fill the dev fields */
94    dev->base_addr = (unsigned long)MVME147_LANCE_BASE;
95    dev->netdev_ops = &lance_netdev_ops;
96    dev->dma = 0;
97
98    addr=(u_long *)ETHERNET_ADDRESS;
99    address = *addr;
100    dev->dev_addr[0]=0x08;
101    dev->dev_addr[1]=0x00;
102    dev->dev_addr[2]=0x3e;
103    address=address>>8;
104    dev->dev_addr[5]=address&0xff;
105    address=address>>8;
106    dev->dev_addr[4]=address&0xff;
107    address=address>>8;
108    dev->dev_addr[3]=address&0xff;
109
110    printk("%s: MVME147 at 0x%08lx, irq %d, "
111           "Hardware Address %pM\n",
112           dev->name, dev->base_addr, MVME147_LANCE_IRQ,
113           dev->dev_addr);
114
115    lp = netdev_priv(dev);
116    lp->ram = __get_dma_pages(GFP_ATOMIC, 3); /* 16K */
117    if (!lp->ram)
118    {
119        printk("%s: No memory for LANCE buffers\n", dev->name);
120        free_netdev(dev);
121        return ERR_PTR(-ENOMEM);
122    }
123
124    lp->lance.name = (char*)name; /* discards const, shut up gcc */
125    lp->lance.base = dev->base_addr;
126    lp->lance.init_block = (struct lance_init_block *)(lp->ram); /* CPU addr */
127    lp->lance.lance_init_block = (struct lance_init_block *)(lp->ram); /* LANCE addr of same RAM */
128    lp->lance.busmaster_regval = LE_C3_BSWP; /* we're bigendian */
129    lp->lance.irq = MVME147_LANCE_IRQ;
130    lp->lance.writerap = (writerap_t)m147lance_writerap;
131    lp->lance.writerdp = (writerdp_t)m147lance_writerdp;
132    lp->lance.readrdp = (readrdp_t)m147lance_readrdp;
133    lp->lance.lance_log_rx_bufs = LANCE_LOG_RX_BUFFERS;
134    lp->lance.lance_log_tx_bufs = LANCE_LOG_TX_BUFFERS;
135    lp->lance.rx_ring_mod_mask = RX_RING_MOD_MASK;
136    lp->lance.tx_ring_mod_mask = TX_RING_MOD_MASK;
137
138    err = register_netdev(dev);
139    if (err) {
140        free_pages(lp->ram, 3);
141        free_netdev(dev);
142        return ERR_PTR(err);
143    }
144
145    return dev;
146}
147
148static void m147lance_writerap(struct lance_private *lp, unsigned short value)
149{
150    out_be16(lp->base + LANCE_RAP, value);
151}
152
153static void m147lance_writerdp(struct lance_private *lp, unsigned short value)
154{
155    out_be16(lp->base + LANCE_RDP, value);
156}
157
158static unsigned short m147lance_readrdp(struct lance_private *lp)
159{
160    return in_be16(lp->base + LANCE_RDP);
161}
162
163static int m147lance_open(struct net_device *dev)
164{
165    int status;
166
167    status = lance_open(dev); /* call generic lance open code */
168    if (status)
169        return status;
170    /* enable interrupts at board level. */
171    m147_pcc->lan_cntrl=0; /* clear the interrupts (if any) */
172    m147_pcc->lan_cntrl=0x08 | 0x04; /* Enable irq 4 */
173
174    return 0;
175}
176
177static int m147lance_close(struct net_device *dev)
178{
179    /* disable interrupts at boardlevel */
180    m147_pcc->lan_cntrl=0x0; /* disable interrupts */
181    lance_close(dev);
182    return 0;
183}
184
185#ifdef MODULE
186MODULE_LICENSE("GPL");
187
188static struct net_device *dev_mvme147_lance;
189int __init init_module(void)
190{
191    dev_mvme147_lance = mvme147lance_probe(-1);
192    if (IS_ERR(dev_mvme147_lance))
193        return PTR_ERR(dev_mvme147_lance);
194    return 0;
195}
196
197void __exit cleanup_module(void)
198{
199    struct m147lance_private *lp = netdev_priv(dev_mvme147_lance);
200    unregister_netdev(dev_mvme147_lance);
201    free_pages(lp->ram, 3);
202    free_netdev(dev_mvme147_lance);
203}
204
205#endif /* MODULE */
206

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