xref: /openbmc/linux/drivers/net/ethernet/amd/hplance.c (revision d58f75de)
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... */
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 
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 */
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  */
170 static void hplance_writerap(void *priv, unsigned short value)
171 {
172 	struct lance_private *lp = (struct lance_private *)priv;
173 
174 	do {
175 		out_be16(lp->base + HPLANCE_REGOFF + LANCE_RAP, value);
176 	} while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
177 }
178 
179 static void hplance_writerdp(void *priv, unsigned short value)
180 {
181 	struct lance_private *lp = (struct lance_private *)priv;
182 
183 	do {
184 		out_be16(lp->base + HPLANCE_REGOFF + LANCE_RDP, value);
185 	} while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
186 }
187 
188 static unsigned short hplance_readrdp(void *priv)
189 {
190 	struct lance_private *lp = (struct lance_private *)priv;
191 	__u16 value;
192 
193 	do {
194 		value = in_be16(lp->base + HPLANCE_REGOFF + LANCE_RDP);
195 	} while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
196 	return value;
197 }
198 
199 static int hplance_open(struct net_device *dev)
200 {
201 	int status;
202 	struct lance_private *lp = netdev_priv(dev);
203 
204 	status = lance_open(dev);                 /* call generic lance open code */
205 	if (status)
206 		return status;
207 	/* enable interrupts at board level. */
208 	out_8(lp->base + HPLANCE_STATUS, LE_IE);
209 
210 	return 0;
211 }
212 
213 static int hplance_close(struct net_device *dev)
214 {
215 	struct lance_private *lp = netdev_priv(dev);
216 
217 	out_8(lp->base + HPLANCE_STATUS, 0);	/* disable interrupts at boardlevel */
218 	lance_close(dev);
219 	return 0;
220 }
221 
222 static int __init hplance_init_module(void)
223 {
224 	return dio_register_driver(&hplance_driver);
225 }
226 
227 static void __exit hplance_cleanup_module(void)
228 {
229 	dio_unregister_driver(&hplance_driver);
230 }
231 
232 module_init(hplance_init_module);
233 module_exit(hplance_cleanup_module);
234 
235 MODULE_LICENSE("GPL");
236