1 // SPDX-License-Identifier: GPL-2.0-only
2 /* hplance.c : the Linux/hp300/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/pgtable.h>
19 /* Used for the temporal inet entries and routing */
20 #include <linux/socket.h>
21 #include <linux/route.h>
22 #include <linux/dio.h>
23 #include <linux/netdevice.h>
24 #include <linux/etherdevice.h>
25 #include <linux/skbuff.h>
26
27 #include <asm/io.h>
28
29 #include "hplance.h"
30
31 /* We have 16392 bytes of RAM for the init block and buffers. This places
32 * an upper limit on the number of buffers we can use. NetBSD uses 8 Rx
33 * buffers and 2 Tx buffers, it takes (8 + 2) * 1544 bytes.
34 */
35 #define LANCE_LOG_TX_BUFFERS 1
36 #define LANCE_LOG_RX_BUFFERS 3
37
38 #include "7990.h" /* use generic LANCE code */
39
40 /* Our private data structure */
41 struct hplance_private {
42 struct lance_private lance;
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 hplance_init_one(struct dio_dev *d, const struct dio_device_id *ent);
51 static void hplance_init(struct net_device *dev, struct dio_dev *d);
52 static void hplance_remove_one(struct dio_dev *d);
53 static void hplance_writerap(void *priv, unsigned short value);
54 static void hplance_writerdp(void *priv, unsigned short value);
55 static unsigned short hplance_readrdp(void *priv);
56 static int hplance_open(struct net_device *dev);
57 static int hplance_close(struct net_device *dev);
58
59 static struct dio_device_id hplance_dio_tbl[] = {
60 { DIO_ID_LAN },
61 { 0 }
62 };
63
64 static struct dio_driver hplance_driver = {
65 .name = "hplance",
66 .id_table = hplance_dio_tbl,
67 .probe = hplance_init_one,
68 .remove = hplance_remove_one,
69 };
70
71 static const struct net_device_ops hplance_netdev_ops = {
72 .ndo_open = hplance_open,
73 .ndo_stop = hplance_close,
74 .ndo_start_xmit = lance_start_xmit,
75 .ndo_set_rx_mode = lance_set_multicast,
76 .ndo_validate_addr = eth_validate_addr,
77 .ndo_set_mac_address = eth_mac_addr,
78 #ifdef CONFIG_NET_POLL_CONTROLLER
79 .ndo_poll_controller = lance_poll,
80 #endif
81 };
82
83 /* Find all the HP Lance boards and initialise them... */
hplance_init_one(struct dio_dev * d,const struct dio_device_id * ent)84 static int hplance_init_one(struct dio_dev *d, const struct dio_device_id *ent)
85 {
86 struct net_device *dev;
87 int err = -ENOMEM;
88
89 dev = alloc_etherdev(sizeof(struct hplance_private));
90 if (!dev)
91 goto out;
92
93 err = -EBUSY;
94 if (!request_mem_region(dio_resource_start(d),
95 dio_resource_len(d), d->name))
96 goto out_free_netdev;
97
98 hplance_init(dev, d);
99 err = register_netdev(dev);
100 if (err)
101 goto out_release_mem_region;
102
103 dio_set_drvdata(d, dev);
104
105 printk(KERN_INFO "%s: %s; select code %d, addr %pM, irq %d\n",
106 dev->name, d->name, d->scode, dev->dev_addr, d->ipl);
107
108 return 0;
109
110 out_release_mem_region:
111 release_mem_region(dio_resource_start(d), dio_resource_len(d));
112 out_free_netdev:
113 free_netdev(dev);
114 out:
115 return err;
116 }
117
hplance_remove_one(struct dio_dev * d)118 static void hplance_remove_one(struct dio_dev *d)
119 {
120 struct net_device *dev = dio_get_drvdata(d);
121
122 unregister_netdev(dev);
123 release_mem_region(dio_resource_start(d), dio_resource_len(d));
124 free_netdev(dev);
125 }
126
127 /* Initialise a single lance board at the given DIO device */
hplance_init(struct net_device * dev,struct dio_dev * d)128 static void hplance_init(struct net_device *dev, struct dio_dev *d)
129 {
130 unsigned long va = (d->resource.start + DIO_VIRADDRBASE);
131 struct hplance_private *lp;
132 int i;
133
134 /* reset the board */
135 out_8(va + DIO_IDOFF, 0xff);
136 udelay(100); /* ariba! ariba! udelay! udelay! */
137
138 /* Fill the dev fields */
139 dev->base_addr = va;
140 dev->netdev_ops = &hplance_netdev_ops;
141 dev->dma = 0;
142
143 for (i = 0; i < 6; i++) {
144 /* The NVRAM holds our ethernet address, one nibble per byte,
145 * at bytes NVRAMOFF+1,3,5,7,9...
146 */
147 dev->dev_addr[i] = ((in_8(va + HPLANCE_NVRAMOFF + i*4 + 1) & 0xF) << 4)
148 | (in_8(va + HPLANCE_NVRAMOFF + i*4 + 3) & 0xF);
149 }
150
151 lp = netdev_priv(dev);
152 lp->lance.name = d->name;
153 lp->lance.base = va;
154 lp->lance.init_block = (struct lance_init_block *)(va + HPLANCE_MEMOFF); /* CPU addr */
155 lp->lance.lance_init_block = NULL; /* LANCE addr of same RAM */
156 lp->lance.busmaster_regval = LE_C3_BSWP; /* we're bigendian */
157 lp->lance.irq = d->ipl;
158 lp->lance.writerap = hplance_writerap;
159 lp->lance.writerdp = hplance_writerdp;
160 lp->lance.readrdp = hplance_readrdp;
161 lp->lance.lance_log_rx_bufs = LANCE_LOG_RX_BUFFERS;
162 lp->lance.lance_log_tx_bufs = LANCE_LOG_TX_BUFFERS;
163 lp->lance.rx_ring_mod_mask = RX_RING_MOD_MASK;
164 lp->lance.tx_ring_mod_mask = TX_RING_MOD_MASK;
165 }
166
167 /* This is disgusting. We have to check the DIO status register for ack every
168 * time we read or write the LANCE registers.
169 */
hplance_writerap(void * priv,unsigned short value)170 static void hplance_writerap(void *priv, unsigned short value)
171 {
172 struct lance_private *lp = (struct lance_private *)priv;
173 do {
174 out_be16(lp->base + HPLANCE_REGOFF + LANCE_RAP, value);
175 } while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
176 }
177
hplance_writerdp(void * priv,unsigned short value)178 static void hplance_writerdp(void *priv, unsigned short value)
179 {
180 struct lance_private *lp = (struct lance_private *)priv;
181 do {
182 out_be16(lp->base + HPLANCE_REGOFF + LANCE_RDP, value);
183 } while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
184 }
185
hplance_readrdp(void * priv)186 static unsigned short hplance_readrdp(void *priv)
187 {
188 struct lance_private *lp = (struct lance_private *)priv;
189 __u16 value;
190 do {
191 value = in_be16(lp->base + HPLANCE_REGOFF + LANCE_RDP);
192 } while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
193 return value;
194 }
195
hplance_open(struct net_device * dev)196 static int hplance_open(struct net_device *dev)
197 {
198 int status;
199 struct lance_private *lp = netdev_priv(dev);
200
201 status = lance_open(dev); /* call generic lance open code */
202 if (status)
203 return status;
204 /* enable interrupts at board level. */
205 out_8(lp->base + HPLANCE_STATUS, LE_IE);
206
207 return 0;
208 }
209
hplance_close(struct net_device * dev)210 static int hplance_close(struct net_device *dev)
211 {
212 struct lance_private *lp = netdev_priv(dev);
213
214 out_8(lp->base + HPLANCE_STATUS, 0); /* disable interrupts at boardlevel */
215 lance_close(dev);
216 return 0;
217 }
218
hplance_init_module(void)219 static int __init hplance_init_module(void)
220 {
221 return dio_register_driver(&hplance_driver);
222 }
223
hplance_cleanup_module(void)224 static void __exit hplance_cleanup_module(void)
225 {
226 dio_unregister_driver(&hplance_driver);
227 }
228
229 module_init(hplance_init_module);
230 module_exit(hplance_cleanup_module);
231
232 MODULE_LICENSE("GPL");
233
