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. */
57 static byte stnic_eadr[6] =
58 {0x00, 0xc0, 0x6e, 0x00, 0x00, 0x07};
59
60 static struct net_device *stnic_dev;
61
62 static void stnic_reset (struct net_device *dev);
63 static void stnic_get_hdr (struct net_device *dev, struct e8390_pkt_hdr *hdr,
64 int ring_page);
65 static void stnic_block_input (struct net_device *dev, int count,
66 struct sk_buff *skb , int ring_offset);
67 static void stnic_block_output (struct net_device *dev, int count,
68 const unsigned char *buf, int start_page);
69
70 static void stnic_init (struct net_device *dev);
71
72 static u32 stnic_msg_enable;
73
74 module_param_named(msg_enable, stnic_msg_enable, uint, 0444);
75 MODULE_PARM_DESC(msg_enable, "Debug message level (see linux/netdevice.h for bitmap)");
76
77 /* SH7750 specific read/write io. */
78 static inline void
STNIC_DELAY(void)79 STNIC_DELAY (void)
80 {
81 vword trash;
82 trash = *(vword *) 0xa0000000;
83 trash = *(vword *) 0xa0000000;
84 trash = *(vword *) 0xa0000000;
85 }
86
87 static inline byte
STNIC_READ(int reg)88 STNIC_READ (int reg)
89 {
90 byte val;
91
92 val = (*(vhalf *) (PA_83902 + ((reg) << 1)) >> 8) & 0xff;
93 STNIC_DELAY ();
94 return val;
95 }
96
97 static inline void
STNIC_WRITE(int reg,byte val)98 STNIC_WRITE (int reg, byte val)
99 {
100 *(vhalf *) (PA_83902 + ((reg) << 1)) = ((half) (val) << 8);
101 STNIC_DELAY ();
102 }
103
stnic_probe(void)104 static int __init stnic_probe(void)
105 {
106 struct net_device *dev;
107 struct ei_device *ei_local;
108 int err;
109
110 /* If we are not running on a SolutionEngine, give up now */
111 if (! MACH_SE)
112 return -ENODEV;
113
114 /* New style probing API */
115 dev = alloc_ei_netdev();
116 if (!dev)
117 return -ENOMEM;
118
119 #ifdef CONFIG_SH_STANDARD_BIOS
120 sh_bios_get_node_addr (stnic_eadr);
121 #endif
122 eth_hw_addr_set(dev, stnic_eadr);
123
124 /* Set the base address to point to the NIC, not the "real" base! */
125 dev->base_addr = 0x1000;
126 dev->irq = IRQ_STNIC;
127 dev->netdev_ops = &ei_netdev_ops;
128
129 /* Snarf the interrupt now. There's no point in waiting since we cannot
130 share and the board will usually be enabled. */
131 err = request_irq (dev->irq, ei_interrupt, 0, DRV_NAME, dev);
132 if (err) {
133 netdev_emerg(dev, " unable to get IRQ %d.\n", dev->irq);
134 free_netdev(dev);
135 return err;
136 }
137
138 ei_status.name = dev->name;
139 ei_status.word16 = 1;
140 #ifdef __LITTLE_ENDIAN__
141 ei_status.bigendian = 0;
142 #else
143 ei_status.bigendian = 1;
144 #endif
145 ei_status.tx_start_page = START_PG;
146 ei_status.rx_start_page = START_PG + TX_PAGES;
147 ei_status.stop_page = STOP_PG;
148
149 ei_status.reset_8390 = &stnic_reset;
150 ei_status.get_8390_hdr = &stnic_get_hdr;
151 ei_status.block_input = &stnic_block_input;
152 ei_status.block_output = &stnic_block_output;
153
154 stnic_init (dev);
155 ei_local = netdev_priv(dev);
156 ei_local->msg_enable = stnic_msg_enable;
157
158 err = register_netdev(dev);
159 if (err) {
160 free_irq(dev->irq, dev);
161 free_netdev(dev);
162 return err;
163 }
164 stnic_dev = dev;
165
166 netdev_info(dev, "NS ST-NIC 83902A\n");
167
168 return 0;
169 }
170
171 static void
stnic_reset(struct net_device * dev)172 stnic_reset (struct net_device *dev)
173 {
174 struct ei_device *ei_local = netdev_priv(dev);
175
176 *(vhalf *) PA_83902_RST = 0;
177 udelay (5);
178 netif_warn(ei_local, hw, dev, "8390 reset done (%ld).\n", jiffies);
179 *(vhalf *) PA_83902_RST = ~0;
180 udelay (5);
181 }
182
183 static void
stnic_get_hdr(struct net_device * dev,struct e8390_pkt_hdr * hdr,int ring_page)184 stnic_get_hdr (struct net_device *dev, struct e8390_pkt_hdr *hdr,
185 int ring_page)
186 {
187 struct ei_device *ei_local = netdev_priv(dev);
188
189 half buf[2];
190
191 STNIC_WRITE (PG0_RSAR0, 0);
192 STNIC_WRITE (PG0_RSAR1, ring_page);
193 STNIC_WRITE (PG0_RBCR0, 4);
194 STNIC_WRITE (PG0_RBCR1, 0);
195 STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA);
196
197 buf[0] = *(vhalf *) PA_83902_IF;
198 STNIC_DELAY ();
199 buf[1] = *(vhalf *) PA_83902_IF;
200 STNIC_DELAY ();
201 hdr->next = buf[0] >> 8;
202 hdr->status = buf[0] & 0xff;
203 #ifdef __LITTLE_ENDIAN__
204 hdr->count = buf[1];
205 #else
206 hdr->count = ((buf[1] >> 8) & 0xff) | (buf[1] << 8);
207 #endif
208
209 netif_dbg(ei_local, probe, dev, "ring %x status %02x next %02x count %04x.\n",
210 ring_page, hdr->status, hdr->next, hdr->count);
211
212 STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA);
213 }
214
215 /* Block input and output, similar to the Crynwr packet driver. If you are
216 porting to a new ethercard look at the packet driver source for hints.
217 The HP LAN doesn't use shared memory -- we put the packet
218 out through the "remote DMA" dataport. */
219
220 static void
stnic_block_input(struct net_device * dev,int length,struct sk_buff * skb,int offset)221 stnic_block_input (struct net_device *dev, int length, struct sk_buff *skb,
222 int offset)
223 {
224 char *buf = skb->data;
225 half val;
226
227 STNIC_WRITE (PG0_RSAR0, offset & 0xff);
228 STNIC_WRITE (PG0_RSAR1, offset >> 8);
229 STNIC_WRITE (PG0_RBCR0, length & 0xff);
230 STNIC_WRITE (PG0_RBCR1, length >> 8);
231 STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA);
232
233 if (length & 1)
234 length++;
235
236 while (length > 0)
237 {
238 val = *(vhalf *) PA_83902_IF;
239 #ifdef __LITTLE_ENDIAN__
240 *buf++ = val & 0xff;
241 *buf++ = val >> 8;
242 #else
243 *buf++ = val >> 8;
244 *buf++ = val & 0xff;
245 #endif
246 STNIC_DELAY ();
247 length -= sizeof (half);
248 }
249
250 STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA);
251 }
252
253 static void
stnic_block_output(struct net_device * dev,int length,const unsigned char * buf,int output_page)254 stnic_block_output (struct net_device *dev, int length,
255 const unsigned char *buf, int output_page)
256 {
257 STNIC_WRITE (PG0_RBCR0, 1); /* Write non-zero value */
258 STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA);
259 STNIC_DELAY ();
260
261 STNIC_WRITE (PG0_RBCR0, length & 0xff);
262 STNIC_WRITE (PG0_RBCR1, length >> 8);
263 STNIC_WRITE (PG0_RSAR0, 0);
264 STNIC_WRITE (PG0_RSAR1, output_page);
265 STNIC_WRITE (STNIC_CR, CR_RWR | CR_PG0 | CR_STA);
266
267 if (length & 1)
268 length++;
269
270 while (length > 0)
271 {
272 #ifdef __LITTLE_ENDIAN__
273 *(vhalf *) PA_83902_IF = ((half) buf[1] << 8) | buf[0];
274 #else
275 *(vhalf *) PA_83902_IF = ((half) buf[0] << 8) | buf[1];
276 #endif
277 STNIC_DELAY ();
278 buf += sizeof (half);
279 length -= sizeof (half);
280 }
281
282 STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA);
283 }
284
285 /* This function resets the STNIC if something screws up. */
286 static void
stnic_init(struct net_device * dev)287 stnic_init (struct net_device *dev)
288 {
289 stnic_reset (dev);
290 NS8390_init (dev, 0);
291 }
292
stnic_cleanup(void)293 static void __exit stnic_cleanup(void)
294 {
295 unregister_netdev(stnic_dev);
296 free_irq(stnic_dev->irq, stnic_dev);
297 free_netdev(stnic_dev);
298 }
299
300 module_init(stnic_probe);
301 module_exit(stnic_cleanup);
302 MODULE_LICENSE("GPL");
303