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1/* stnic.c : A SH7750 specific part of driver for NS DP83902A ST-NIC.
2 *
3 * This file is subject to the terms and conditions of the GNU General Public
4 * License. See the file "COPYING" in the main directory of this archive
5 * for more details.
6 *
7 * Copyright (C) 1999 kaz Kojima
8 */
9
10#include <linux/module.h>
11#include <linux/kernel.h>
12#include <linux/errno.h>
13#include <linux/interrupt.h>
14#include <linux/ioport.h>
15#include <linux/netdevice.h>
16#include <linux/etherdevice.h>
17#include <linux/init.h>
18#include <linux/delay.h>
19
20#include <asm/io.h>
21#include <mach-se/mach/se.h>
22#include <asm/machvec.h>
23#ifdef CONFIG_SH_STANDARD_BIOS
24#include <asm/sh_bios.h>
25#endif
26
27#include "8390.h"
28
29#define DRV_NAME "stnic"
30
31#define byte unsigned char
32#define half unsigned short
33#define word unsigned int
34#define vbyte volatile unsigned char
35#define vhalf volatile unsigned short
36#define vword volatile unsigned int
37
38#define STNIC_RUN 0x01 /* 1 == Run, 0 == reset. */
39
40#define START_PG 0 /* First page of TX buffer */
41#define STOP_PG 128 /* Last page +1 of RX ring */
42
43/* Alias */
44#define STNIC_CR E8390_CMD
45#define PG0_RSAR0 EN0_RSARLO
46#define PG0_RSAR1 EN0_RSARHI
47#define PG0_RBCR0 EN0_RCNTLO
48#define PG0_RBCR1 EN0_RCNTHI
49
50#define CR_RRD E8390_RREAD
51#define CR_RWR E8390_RWRITE
52#define CR_PG0 E8390_PAGE0
53#define CR_STA E8390_START
54#define CR_RDMA E8390_NODMA
55
56/* FIXME! YOU MUST SET YOUR OWN ETHER ADDRESS. */
57static byte stnic_eadr[6] =
58{0x00, 0xc0, 0x6e, 0x00, 0x00, 0x07};
59
60static struct net_device *stnic_dev;
61
62static void stnic_reset (struct net_device *dev);
63static void stnic_get_hdr (struct net_device *dev, struct e8390_pkt_hdr *hdr,
64 int ring_page);
65static void stnic_block_input (struct net_device *dev, int count,
66 struct sk_buff *skb , int ring_offset);
67static void stnic_block_output (struct net_device *dev, int count,
68 const unsigned char *buf, int start_page);
69
70static void stnic_init (struct net_device *dev);
71
72/* SH7750 specific read/write io. */
73static inline void
74STNIC_DELAY (void)
75{
76 vword trash;
77 trash = *(vword *) 0xa0000000;
78 trash = *(vword *) 0xa0000000;
79 trash = *(vword *) 0xa0000000;
80}
81
82static inline byte
83STNIC_READ (int reg)
84{
85 byte val;
86
87 val = (*(vhalf *) (PA_83902 + ((reg) << 1)) >> 8) & 0xff;
88 STNIC_DELAY ();
89 return val;
90}
91
92static inline void
93STNIC_WRITE (int reg, byte val)
94{
95 *(vhalf *) (PA_83902 + ((reg) << 1)) = ((half) (val) << 8);
96 STNIC_DELAY ();
97}
98
99static int __init stnic_probe(void)
100{
101 struct net_device *dev;
102 int i, err;
103
104 /* If we are not running on a SolutionEngine, give up now */
105 if (! MACH_SE)
106 return -ENODEV;
107
108 /* New style probing API */
109 dev = alloc_ei_netdev();
110 if (!dev)
111 return -ENOMEM;
112
113#ifdef CONFIG_SH_STANDARD_BIOS
114 sh_bios_get_node_addr (stnic_eadr);
115#endif
116 for (i = 0; i < ETH_ALEN; i++)
117 dev->dev_addr[i] = stnic_eadr[i];
118
119 /* Set the base address to point to the NIC, not the "real" base! */
120 dev->base_addr = 0x1000;
121 dev->irq = IRQ_STNIC;
122 dev->netdev_ops = &ei_netdev_ops;
123
124 /* Snarf the interrupt now. There's no point in waiting since we cannot
125 share and the board will usually be enabled. */
126 err = request_irq (dev->irq, ei_interrupt, 0, DRV_NAME, dev);
127 if (err) {
128 printk (KERN_EMERG " unable to get IRQ %d.\n", dev->irq);
129 free_netdev(dev);
130 return err;
131 }
132
133 ei_status.name = dev->name;
134 ei_status.word16 = 1;
135#ifdef __LITTLE_ENDIAN__
136 ei_status.bigendian = 0;
137#else
138 ei_status.bigendian = 1;
139#endif
140 ei_status.tx_start_page = START_PG;
141 ei_status.rx_start_page = START_PG + TX_PAGES;
142 ei_status.stop_page = STOP_PG;
143
144 ei_status.reset_8390 = &stnic_reset;
145 ei_status.get_8390_hdr = &stnic_get_hdr;
146 ei_status.block_input = &stnic_block_input;
147 ei_status.block_output = &stnic_block_output;
148
149 stnic_init (dev);
150
151 err = register_netdev(dev);
152 if (err) {
153 free_irq(dev->irq, dev);
154 free_netdev(dev);
155 return err;
156 }
157 stnic_dev = dev;
158
159 printk (KERN_INFO "NS ST-NIC 83902A\n");
160
161 return 0;
162}
163
164static void
165stnic_reset (struct net_device *dev)
166{
167 *(vhalf *) PA_83902_RST = 0;
168 udelay (5);
169 if (ei_debug > 1)
170 printk (KERN_WARNING "8390 reset done (%ld).\n", jiffies);
171 *(vhalf *) PA_83902_RST = ~0;
172 udelay (5);
173}
174
175static void
176stnic_get_hdr (struct net_device *dev, struct e8390_pkt_hdr *hdr,
177 int ring_page)
178{
179 half buf[2];
180
181 STNIC_WRITE (PG0_RSAR0, 0);
182 STNIC_WRITE (PG0_RSAR1, ring_page);
183 STNIC_WRITE (PG0_RBCR0, 4);
184 STNIC_WRITE (PG0_RBCR1, 0);
185 STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA);
186
187 buf[0] = *(vhalf *) PA_83902_IF;
188 STNIC_DELAY ();
189 buf[1] = *(vhalf *) PA_83902_IF;
190 STNIC_DELAY ();
191 hdr->next = buf[0] >> 8;
192 hdr->status = buf[0] & 0xff;
193#ifdef __LITTLE_ENDIAN__
194 hdr->count = buf[1];
195#else
196 hdr->count = ((buf[1] >> 8) & 0xff) | (buf[1] << 8);
197#endif
198
199 if (ei_debug > 1)
200 printk (KERN_DEBUG "ring %x status %02x next %02x count %04x.\n",
201 ring_page, hdr->status, hdr->next, hdr->count);
202
203 STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA);
204}
205
206/* Block input and output, similar to the Crynwr packet driver. If you are
207 porting to a new ethercard look at the packet driver source for hints.
208 The HP LAN doesn't use shared memory -- we put the packet
209 out through the "remote DMA" dataport. */
210
211static void
212stnic_block_input (struct net_device *dev, int length, struct sk_buff *skb,
213 int offset)
214{
215 char *buf = skb->data;
216 half val;
217
218 STNIC_WRITE (PG0_RSAR0, offset & 0xff);
219 STNIC_WRITE (PG0_RSAR1, offset >> 8);
220 STNIC_WRITE (PG0_RBCR0, length & 0xff);
221 STNIC_WRITE (PG0_RBCR1, length >> 8);
222 STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA);
223
224 if (length & 1)
225 length++;
226
227 while (length > 0)
228 {
229 val = *(vhalf *) PA_83902_IF;
230#ifdef __LITTLE_ENDIAN__
231 *buf++ = val & 0xff;
232 *buf++ = val >> 8;
233#else
234 *buf++ = val >> 8;
235 *buf++ = val & 0xff;
236#endif
237 STNIC_DELAY ();
238 length -= sizeof (half);
239 }
240
241 STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA);
242}
243
244static void
245stnic_block_output (struct net_device *dev, int length,
246 const unsigned char *buf, int output_page)
247{
248 STNIC_WRITE (PG0_RBCR0, 1); /* Write non-zero value */
249 STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA);
250 STNIC_DELAY ();
251
252 STNIC_WRITE (PG0_RBCR0, length & 0xff);
253 STNIC_WRITE (PG0_RBCR1, length >> 8);
254 STNIC_WRITE (PG0_RSAR0, 0);
255 STNIC_WRITE (PG0_RSAR1, output_page);
256 STNIC_WRITE (STNIC_CR, CR_RWR | CR_PG0 | CR_STA);
257
258 if (length & 1)
259 length++;
260
261 while (length > 0)
262 {
263#ifdef __LITTLE_ENDIAN__
264 *(vhalf *) PA_83902_IF = ((half) buf[1] << 8) | buf[0];
265#else
266 *(vhalf *) PA_83902_IF = ((half) buf[0] << 8) | buf[1];
267#endif
268 STNIC_DELAY ();
269 buf += sizeof (half);
270 length -= sizeof (half);
271 }
272
273 STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA);
274}
275
276/* This function resets the STNIC if something screws up. */
277static void
278stnic_init (struct net_device *dev)
279{
280 stnic_reset (dev);
281 NS8390_init (dev, 0);
282}
283
284static void __exit stnic_cleanup(void)
285{
286 unregister_netdev(stnic_dev);
287 free_irq(stnic_dev->irq, stnic_dev);
288 free_netdev(stnic_dev);
289}
290
291module_init(stnic_probe);
292module_exit(stnic_cleanup);
293MODULE_LICENSE("GPL");