Root/drivers/net/stnic.c

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/system.h>
21#include <asm/io.h>
22#include <mach-se/mach/se.h>
23#include <asm/machvec.h>
24#ifdef CONFIG_SH_STANDARD_BIOS
25#include <asm/sh_bios.h>
26#endif
27
28#include "8390.h"
29
30#define DRV_NAME "stnic"
31
32#define byte unsigned char
33#define half unsigned short
34#define word unsigned int
35#define vbyte volatile unsigned char
36#define vhalf volatile unsigned short
37#define vword volatile unsigned int
38
39#define STNIC_RUN 0x01 /* 1 == Run, 0 == reset. */
40
41#define START_PG 0 /* First page of TX buffer */
42#define STOP_PG 128 /* Last page +1 of RX ring */
43
44/* Alias */
45#define STNIC_CR E8390_CMD
46#define PG0_RSAR0 EN0_RSARLO
47#define PG0_RSAR1 EN0_RSARHI
48#define PG0_RBCR0 EN0_RCNTLO
49#define PG0_RBCR1 EN0_RCNTHI
50
51#define CR_RRD E8390_RREAD
52#define CR_RWR E8390_RWRITE
53#define CR_PG0 E8390_PAGE0
54#define CR_STA E8390_START
55#define CR_RDMA E8390_NODMA
56
57/* FIXME! YOU MUST SET YOUR OWN ETHER ADDRESS. */
58static byte stnic_eadr[6] =
59{0x00, 0xc0, 0x6e, 0x00, 0x00, 0x07};
60
61static struct net_device *stnic_dev;
62
63static void stnic_reset (struct net_device *dev);
64static void stnic_get_hdr (struct net_device *dev, struct e8390_pkt_hdr *hdr,
65               int ring_page);
66static void stnic_block_input (struct net_device *dev, int count,
67                   struct sk_buff *skb , int ring_offset);
68static void stnic_block_output (struct net_device *dev, int count,
69                const unsigned char *buf, int start_page);
70
71static void stnic_init (struct net_device *dev);
72
73/* SH7750 specific read/write io. */
74static inline void
75STNIC_DELAY (void)
76{
77  vword trash;
78  trash = *(vword *) 0xa0000000;
79  trash = *(vword *) 0xa0000000;
80  trash = *(vword *) 0xa0000000;
81}
82
83static inline byte
84STNIC_READ (int reg)
85{
86  byte val;
87
88  val = (*(vhalf *) (PA_83902 + ((reg) << 1)) >> 8) & 0xff;
89  STNIC_DELAY ();
90  return val;
91}
92
93static inline void
94STNIC_WRITE (int reg, byte val)
95{
96  *(vhalf *) (PA_83902 + ((reg) << 1)) = ((half) (val) << 8);
97  STNIC_DELAY ();
98}
99
100static int __init stnic_probe(void)
101{
102  struct net_device *dev;
103  int i, err;
104
105  /* If we are not running on a SolutionEngine, give up now */
106  if (! MACH_SE)
107    return -ENODEV;
108
109  /* New style probing API */
110  dev = alloc_ei_netdev();
111  if (!dev)
112      return -ENOMEM;
113
114#ifdef CONFIG_SH_STANDARD_BIOS
115  sh_bios_get_node_addr (stnic_eadr);
116#endif
117  for (i = 0; i < ETHER_ADDR_LEN; i++)
118    dev->dev_addr[i] = stnic_eadr[i];
119
120  /* Set the base address to point to the NIC, not the "real" base! */
121  dev->base_addr = 0x1000;
122  dev->irq = IRQ_STNIC;
123  dev->netdev_ops = &ei_netdev_ops;
124
125  /* Snarf the interrupt now. There's no point in waiting since we cannot
126     share and the board will usually be enabled. */
127  err = request_irq (dev->irq, ei_interrupt, 0, DRV_NAME, dev);
128  if (err) {
129      printk (KERN_EMERG " unable to get IRQ %d.\n", dev->irq);
130      free_netdev(dev);
131      return err;
132    }
133
134  ei_status.name = dev->name;
135  ei_status.word16 = 1;
136#ifdef __LITTLE_ENDIAN__
137  ei_status.bigendian = 0;
138#else
139  ei_status.bigendian = 1;
140#endif
141  ei_status.tx_start_page = START_PG;
142  ei_status.rx_start_page = START_PG + TX_PAGES;
143  ei_status.stop_page = STOP_PG;
144
145  ei_status.reset_8390 = &stnic_reset;
146  ei_status.get_8390_hdr = &stnic_get_hdr;
147  ei_status.block_input = &stnic_block_input;
148  ei_status.block_output = &stnic_block_output;
149
150  stnic_init (dev);
151
152  err = register_netdev(dev);
153  if (err) {
154    free_irq(dev->irq, dev);
155    free_netdev(dev);
156    return err;
157  }
158  stnic_dev = dev;
159
160  printk (KERN_INFO "NS ST-NIC 83902A\n");
161
162  return 0;
163}
164
165static void
166stnic_reset (struct net_device *dev)
167{
168  *(vhalf *) PA_83902_RST = 0;
169  udelay (5);
170  if (ei_debug > 1)
171    printk (KERN_WARNING "8390 reset done (%ld).\n", jiffies);
172  *(vhalf *) PA_83902_RST = ~0;
173  udelay (5);
174}
175
176static void
177stnic_get_hdr (struct net_device *dev, struct e8390_pkt_hdr *hdr,
178           int ring_page)
179{
180  half buf[2];
181
182  STNIC_WRITE (PG0_RSAR0, 0);
183  STNIC_WRITE (PG0_RSAR1, ring_page);
184  STNIC_WRITE (PG0_RBCR0, 4);
185  STNIC_WRITE (PG0_RBCR1, 0);
186  STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA);
187
188  buf[0] = *(vhalf *) PA_83902_IF;
189  STNIC_DELAY ();
190  buf[1] = *(vhalf *) PA_83902_IF;
191  STNIC_DELAY ();
192  hdr->next = buf[0] >> 8;
193  hdr->status = buf[0] & 0xff;
194#ifdef __LITTLE_ENDIAN__
195  hdr->count = buf[1];
196#else
197  hdr->count = ((buf[1] >> 8) & 0xff) | (buf[1] << 8);
198#endif
199
200  if (ei_debug > 1)
201    printk (KERN_DEBUG "ring %x status %02x next %02x count %04x.\n",
202        ring_page, hdr->status, hdr->next, hdr->count);
203
204  STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA);
205}
206
207/* Block input and output, similar to the Crynwr packet driver. If you are
208   porting to a new ethercard look at the packet driver source for hints.
209   The HP LAN doesn't use shared memory -- we put the packet
210   out through the "remote DMA" dataport. */
211
212static void
213stnic_block_input (struct net_device *dev, int length, struct sk_buff *skb,
214           int offset)
215{
216  char *buf = skb->data;
217  half val;
218
219  STNIC_WRITE (PG0_RSAR0, offset & 0xff);
220  STNIC_WRITE (PG0_RSAR1, offset >> 8);
221  STNIC_WRITE (PG0_RBCR0, length & 0xff);
222  STNIC_WRITE (PG0_RBCR1, length >> 8);
223  STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA);
224
225  if (length & 1)
226    length++;
227
228  while (length > 0)
229    {
230      val = *(vhalf *) PA_83902_IF;
231#ifdef __LITTLE_ENDIAN__
232      *buf++ = val & 0xff;
233      *buf++ = val >> 8;
234#else
235      *buf++ = val >> 8;
236      *buf++ = val & 0xff;
237#endif
238      STNIC_DELAY ();
239      length -= sizeof (half);
240    }
241
242  STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA);
243}
244
245static void
246stnic_block_output (struct net_device *dev, int length,
247            const unsigned char *buf, int output_page)
248{
249  STNIC_WRITE (PG0_RBCR0, 1); /* Write non-zero value */
250  STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA);
251  STNIC_DELAY ();
252
253  STNIC_WRITE (PG0_RBCR0, length & 0xff);
254  STNIC_WRITE (PG0_RBCR1, length >> 8);
255  STNIC_WRITE (PG0_RSAR0, 0);
256  STNIC_WRITE (PG0_RSAR1, output_page);
257  STNIC_WRITE (STNIC_CR, CR_RWR | CR_PG0 | CR_STA);
258
259  if (length & 1)
260    length++;
261
262  while (length > 0)
263    {
264#ifdef __LITTLE_ENDIAN__
265      *(vhalf *) PA_83902_IF = ((half) buf[1] << 8) | buf[0];
266#else
267      *(vhalf *) PA_83902_IF = ((half) buf[0] << 8) | buf[1];
268#endif
269      STNIC_DELAY ();
270      buf += sizeof (half);
271      length -= sizeof (half);
272    }
273
274  STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA);
275}
276
277/* This function resets the STNIC if something screws up. */
278static void
279stnic_init (struct net_device *dev)
280{
281  stnic_reset (dev);
282  NS8390_init (dev, 0);
283  return;
284}
285
286static void __exit stnic_cleanup(void)
287{
288    unregister_netdev(stnic_dev);
289    free_irq(stnic_dev->irq, stnic_dev);
290    free_netdev(stnic_dev);
291}
292
293module_init(stnic_probe);
294module_exit(stnic_cleanup);
295MODULE_LICENSE("GPL");
296

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