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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 | ||
1da177e4 LT |
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 | ||
1da177e4 | 20 | #include <asm/io.h> |
26a8ef53 | 21 | #include <mach-se/mach/se.h> |
1da177e4 | 22 | #include <asm/machvec.h> |
6aa20a22 | 23 | #ifdef CONFIG_SH_STANDARD_BIOS |
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | /* SH7750 specific read/write io. */ | |
73 | static inline void | |
74 | STNIC_DELAY (void) | |
75 | { | |
76 | vword trash; | |
77 | trash = *(vword *) 0xa0000000; | |
78 | trash = *(vword *) 0xa0000000; | |
79 | trash = *(vword *) 0xa0000000; | |
80 | } | |
81 | ||
82 | static inline byte | |
83 | STNIC_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 | ||
92 | static inline void | |
93 | STNIC_WRITE (int reg, byte val) | |
94 | { | |
95 | *(vhalf *) (PA_83902 + ((reg) << 1)) = ((half) (val) << 8); | |
96 | STNIC_DELAY (); | |
97 | } | |
6aa20a22 | 98 | |
1da177e4 LT |
99 | static 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; | |
1da177e4 | 112 | |
6aa20a22 | 113 | #ifdef CONFIG_SH_STANDARD_BIOS |
1da177e4 LT |
114 | sh_bios_get_node_addr (stnic_eadr); |
115 | #endif | |
104bf3fb | 116 | for (i = 0; i < ETH_ALEN; i++) |
1da177e4 LT |
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; | |
e0b8cb0e | 122 | dev->netdev_ops = &ei_netdev_ops; |
1da177e4 LT |
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; | |
6aa20a22 | 135 | #ifdef __LITTLE_ENDIAN__ |
1da177e4 LT |
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 | ||
1da177e4 LT |
164 | static void |
165 | stnic_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 | ||
175 | static void | |
176 | stnic_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 | ||
211 | static void | |
212 | stnic_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 | ||
244 | static void | |
245 | stnic_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. */ | |
277 | static void | |
278 | stnic_init (struct net_device *dev) | |
279 | { | |
280 | stnic_reset (dev); | |
281 | NS8390_init (dev, 0); | |
1da177e4 LT |
282 | } |
283 | ||
284 | static 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 | ||
291 | module_init(stnic_probe); | |
292 | module_exit(stnic_cleanup); | |
293 | MODULE_LICENSE("GPL"); |