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1da177e4 LT |
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/config.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/interrupt.h> | |
15 | #include <linux/ioport.h> | |
16 | #include <linux/netdevice.h> | |
17 | #include <linux/etherdevice.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/delay.h> | |
20 | ||
21 | #include <asm/system.h> | |
22 | #include <asm/io.h> | |
23 | #include <asm/se/se.h> | |
24 | #include <asm/machvec.h> | |
25 | #ifdef CONFIG_SH_STANDARD_BIOS | |
26 | #include <asm/sh_bios.h> | |
27 | #endif | |
28 | ||
29 | #include "8390.h" | |
30 | ||
31 | #define DRV_NAME "stnic" | |
32 | ||
33 | #define byte unsigned char | |
34 | #define half unsigned short | |
35 | #define word unsigned int | |
36 | #define vbyte volatile unsigned char | |
37 | #define vhalf volatile unsigned short | |
38 | #define vword volatile unsigned int | |
39 | ||
40 | #define STNIC_RUN 0x01 /* 1 == Run, 0 == reset. */ | |
41 | ||
42 | #define START_PG 0 /* First page of TX buffer */ | |
43 | #define STOP_PG 128 /* Last page +1 of RX ring */ | |
44 | ||
45 | /* Alias */ | |
46 | #define STNIC_CR E8390_CMD | |
47 | #define PG0_RSAR0 EN0_RSARLO | |
48 | #define PG0_RSAR1 EN0_RSARHI | |
49 | #define PG0_RBCR0 EN0_RCNTLO | |
50 | #define PG0_RBCR1 EN0_RCNTHI | |
51 | ||
52 | #define CR_RRD E8390_RREAD | |
53 | #define CR_RWR E8390_RWRITE | |
54 | #define CR_PG0 E8390_PAGE0 | |
55 | #define CR_STA E8390_START | |
56 | #define CR_RDMA E8390_NODMA | |
57 | ||
58 | /* FIXME! YOU MUST SET YOUR OWN ETHER ADDRESS. */ | |
59 | static byte stnic_eadr[6] = | |
60 | {0x00, 0xc0, 0x6e, 0x00, 0x00, 0x07}; | |
61 | ||
62 | static struct net_device *stnic_dev; | |
63 | ||
64 | static int stnic_open (struct net_device *dev); | |
65 | static int stnic_close (struct net_device *dev); | |
66 | static void stnic_reset (struct net_device *dev); | |
67 | static void stnic_get_hdr (struct net_device *dev, struct e8390_pkt_hdr *hdr, | |
68 | int ring_page); | |
69 | static void stnic_block_input (struct net_device *dev, int count, | |
70 | struct sk_buff *skb , int ring_offset); | |
71 | static void stnic_block_output (struct net_device *dev, int count, | |
72 | const unsigned char *buf, int start_page); | |
73 | ||
74 | static void stnic_init (struct net_device *dev); | |
75 | ||
76 | /* SH7750 specific read/write io. */ | |
77 | static inline void | |
78 | STNIC_DELAY (void) | |
79 | { | |
80 | vword trash; | |
81 | trash = *(vword *) 0xa0000000; | |
82 | trash = *(vword *) 0xa0000000; | |
83 | trash = *(vword *) 0xa0000000; | |
84 | } | |
85 | ||
86 | static inline byte | |
87 | STNIC_READ (int reg) | |
88 | { | |
89 | byte val; | |
90 | ||
91 | val = (*(vhalf *) (PA_83902 + ((reg) << 1)) >> 8) & 0xff; | |
92 | STNIC_DELAY (); | |
93 | return val; | |
94 | } | |
95 | ||
96 | static inline void | |
97 | STNIC_WRITE (int reg, byte val) | |
98 | { | |
99 | *(vhalf *) (PA_83902 + ((reg) << 1)) = ((half) (val) << 8); | |
100 | STNIC_DELAY (); | |
101 | } | |
102 | \f | |
103 | static int __init stnic_probe(void) | |
104 | { | |
105 | struct net_device *dev; | |
106 | int i, err; | |
107 | ||
108 | /* If we are not running on a SolutionEngine, give up now */ | |
109 | if (! MACH_SE) | |
110 | return -ENODEV; | |
111 | ||
112 | /* New style probing API */ | |
113 | dev = alloc_ei_netdev(); | |
114 | if (!dev) | |
115 | return -ENOMEM; | |
116 | SET_MODULE_OWNER(dev); | |
117 | ||
118 | #ifdef CONFIG_SH_STANDARD_BIOS | |
119 | sh_bios_get_node_addr (stnic_eadr); | |
120 | #endif | |
121 | for (i = 0; i < ETHER_ADDR_LEN; i++) | |
122 | dev->dev_addr[i] = stnic_eadr[i]; | |
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->open = &stnic_open; | |
128 | dev->stop = &stnic_close; | |
129 | #ifdef CONFIG_NET_POLL_CONTROLLER | |
130 | dev->poll_controller = ei_poll; | |
131 | #endif | |
132 | ||
133 | /* Snarf the interrupt now. There's no point in waiting since we cannot | |
134 | share and the board will usually be enabled. */ | |
135 | err = request_irq (dev->irq, ei_interrupt, 0, DRV_NAME, dev); | |
136 | if (err) { | |
137 | printk (KERN_EMERG " unable to get IRQ %d.\n", dev->irq); | |
138 | free_netdev(dev); | |
139 | return err; | |
140 | } | |
141 | ||
142 | ei_status.name = dev->name; | |
143 | ei_status.word16 = 1; | |
144 | #ifdef __LITTLE_ENDIAN__ | |
145 | ei_status.bigendian = 0; | |
146 | #else | |
147 | ei_status.bigendian = 1; | |
148 | #endif | |
149 | ei_status.tx_start_page = START_PG; | |
150 | ei_status.rx_start_page = START_PG + TX_PAGES; | |
151 | ei_status.stop_page = STOP_PG; | |
152 | ||
153 | ei_status.reset_8390 = &stnic_reset; | |
154 | ei_status.get_8390_hdr = &stnic_get_hdr; | |
155 | ei_status.block_input = &stnic_block_input; | |
156 | ei_status.block_output = &stnic_block_output; | |
157 | ||
158 | stnic_init (dev); | |
159 | ||
160 | err = register_netdev(dev); | |
161 | if (err) { | |
162 | free_irq(dev->irq, dev); | |
163 | free_netdev(dev); | |
164 | return err; | |
165 | } | |
166 | stnic_dev = dev; | |
167 | ||
168 | printk (KERN_INFO "NS ST-NIC 83902A\n"); | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
173 | static int | |
174 | stnic_open (struct net_device *dev) | |
175 | { | |
176 | #if 0 | |
177 | printk (KERN_DEBUG "stnic open\n"); | |
178 | #endif | |
179 | ei_open (dev); | |
180 | return 0; | |
181 | } | |
182 | ||
183 | static int | |
184 | stnic_close (struct net_device *dev) | |
185 | { | |
186 | ei_close (dev); | |
187 | return 0; | |
188 | } | |
189 | ||
190 | static void | |
191 | stnic_reset (struct net_device *dev) | |
192 | { | |
193 | *(vhalf *) PA_83902_RST = 0; | |
194 | udelay (5); | |
195 | if (ei_debug > 1) | |
196 | printk (KERN_WARNING "8390 reset done (%ld).\n", jiffies); | |
197 | *(vhalf *) PA_83902_RST = ~0; | |
198 | udelay (5); | |
199 | } | |
200 | ||
201 | static void | |
202 | stnic_get_hdr (struct net_device *dev, struct e8390_pkt_hdr *hdr, | |
203 | int ring_page) | |
204 | { | |
205 | half buf[2]; | |
206 | ||
207 | STNIC_WRITE (PG0_RSAR0, 0); | |
208 | STNIC_WRITE (PG0_RSAR1, ring_page); | |
209 | STNIC_WRITE (PG0_RBCR0, 4); | |
210 | STNIC_WRITE (PG0_RBCR1, 0); | |
211 | STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA); | |
212 | ||
213 | buf[0] = *(vhalf *) PA_83902_IF; | |
214 | STNIC_DELAY (); | |
215 | buf[1] = *(vhalf *) PA_83902_IF; | |
216 | STNIC_DELAY (); | |
217 | hdr->next = buf[0] >> 8; | |
218 | hdr->status = buf[0] & 0xff; | |
219 | #ifdef __LITTLE_ENDIAN__ | |
220 | hdr->count = buf[1]; | |
221 | #else | |
222 | hdr->count = ((buf[1] >> 8) & 0xff) | (buf[1] << 8); | |
223 | #endif | |
224 | ||
225 | if (ei_debug > 1) | |
226 | printk (KERN_DEBUG "ring %x status %02x next %02x count %04x.\n", | |
227 | ring_page, hdr->status, hdr->next, hdr->count); | |
228 | ||
229 | STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA); | |
230 | } | |
231 | ||
232 | /* Block input and output, similar to the Crynwr packet driver. If you are | |
233 | porting to a new ethercard look at the packet driver source for hints. | |
234 | The HP LAN doesn't use shared memory -- we put the packet | |
235 | out through the "remote DMA" dataport. */ | |
236 | ||
237 | static void | |
238 | stnic_block_input (struct net_device *dev, int length, struct sk_buff *skb, | |
239 | int offset) | |
240 | { | |
241 | char *buf = skb->data; | |
242 | half val; | |
243 | ||
244 | STNIC_WRITE (PG0_RSAR0, offset & 0xff); | |
245 | STNIC_WRITE (PG0_RSAR1, offset >> 8); | |
246 | STNIC_WRITE (PG0_RBCR0, length & 0xff); | |
247 | STNIC_WRITE (PG0_RBCR1, length >> 8); | |
248 | STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA); | |
249 | ||
250 | if (length & 1) | |
251 | length++; | |
252 | ||
253 | while (length > 0) | |
254 | { | |
255 | val = *(vhalf *) PA_83902_IF; | |
256 | #ifdef __LITTLE_ENDIAN__ | |
257 | *buf++ = val & 0xff; | |
258 | *buf++ = val >> 8; | |
259 | #else | |
260 | *buf++ = val >> 8; | |
261 | *buf++ = val & 0xff; | |
262 | #endif | |
263 | STNIC_DELAY (); | |
264 | length -= sizeof (half); | |
265 | } | |
266 | ||
267 | STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA); | |
268 | } | |
269 | ||
270 | static void | |
271 | stnic_block_output (struct net_device *dev, int length, | |
272 | const unsigned char *buf, int output_page) | |
273 | { | |
274 | STNIC_WRITE (PG0_RBCR0, 1); /* Write non-zero value */ | |
275 | STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA); | |
276 | STNIC_DELAY (); | |
277 | ||
278 | STNIC_WRITE (PG0_RBCR0, length & 0xff); | |
279 | STNIC_WRITE (PG0_RBCR1, length >> 8); | |
280 | STNIC_WRITE (PG0_RSAR0, 0); | |
281 | STNIC_WRITE (PG0_RSAR1, output_page); | |
282 | STNIC_WRITE (STNIC_CR, CR_RWR | CR_PG0 | CR_STA); | |
283 | ||
284 | if (length & 1) | |
285 | length++; | |
286 | ||
287 | while (length > 0) | |
288 | { | |
289 | #ifdef __LITTLE_ENDIAN__ | |
290 | *(vhalf *) PA_83902_IF = ((half) buf[1] << 8) | buf[0]; | |
291 | #else | |
292 | *(vhalf *) PA_83902_IF = ((half) buf[0] << 8) | buf[1]; | |
293 | #endif | |
294 | STNIC_DELAY (); | |
295 | buf += sizeof (half); | |
296 | length -= sizeof (half); | |
297 | } | |
298 | ||
299 | STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA); | |
300 | } | |
301 | ||
302 | /* This function resets the STNIC if something screws up. */ | |
303 | static void | |
304 | stnic_init (struct net_device *dev) | |
305 | { | |
306 | stnic_reset (dev); | |
307 | NS8390_init (dev, 0); | |
308 | return; | |
309 | } | |
310 | ||
311 | static void __exit stnic_cleanup(void) | |
312 | { | |
313 | unregister_netdev(stnic_dev); | |
314 | free_irq(stnic_dev->irq, stnic_dev); | |
315 | free_netdev(stnic_dev); | |
316 | } | |
317 | ||
318 | module_init(stnic_probe); | |
319 | module_exit(stnic_cleanup); | |
320 | MODULE_LICENSE("GPL"); |