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1/*
2 * Helper functions for the PM3386s on the Radisys ENP2611
3 * Copyright (C) 2004, 2005 Lennert Buytenhek <buytenh@wantstofly.org>
4 * Dedicated to Marija Kulikova.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11
12#include <linux/module.h>
13#include <linux/delay.h>
14#include <linux/netdevice.h>
15#include <asm/io.h>
16#include "pm3386.h"
17
18/*
19 * Read from register 'reg' of PM3386 device 'pm'.
20 */
21static u16 pm3386_reg_read(int pm, int reg)
22{
23 void *_reg;
24 u16 value;
25
26 _reg = (void *)ENP2611_PM3386_0_VIRT_BASE;
27 if (pm == 1)
28 _reg = (void *)ENP2611_PM3386_1_VIRT_BASE;
29
30 value = *((volatile u16 *)(_reg + (reg << 1)));
31
32// printk(KERN_INFO "pm3386_reg_read(%d, %.3x) = %.8x\n", pm, reg, value);
33
34 return value;
35}
36
37/*
38 * Write to register 'reg' of PM3386 device 'pm', and perform
39 * a readback from the identification register.
40 */
41static void pm3386_reg_write(int pm, int reg, u16 value)
42{
43 void *_reg;
44 u16 dummy;
45
46// printk(KERN_INFO "pm3386_reg_write(%d, %.3x, %.8x)\n", pm, reg, value);
47
48 _reg = (void *)ENP2611_PM3386_0_VIRT_BASE;
49 if (pm == 1)
50 _reg = (void *)ENP2611_PM3386_1_VIRT_BASE;
51
52 *((volatile u16 *)(_reg + (reg << 1))) = value;
53
54 dummy = *((volatile u16 *)_reg);
55 __asm__ __volatile__("mov %0, %0" : "+r" (dummy));
56}
57
58/*
59 * Read from port 'port' register 'reg', where the registers
60 * for the different ports are 'spacing' registers apart.
61 */
62static u16 pm3386_port_reg_read(int port, int _reg, int spacing)
63{
64 int reg;
65
66 reg = _reg;
67 if (port & 1)
68 reg += spacing;
69
70 return pm3386_reg_read(port >> 1, reg);
71}
72
73/*
74 * Write to port 'port' register 'reg', where the registers
75 * for the different ports are 'spacing' registers apart.
76 */
77static void pm3386_port_reg_write(int port, int _reg, int spacing, u16 value)
78{
79 int reg;
80
81 reg = _reg;
82 if (port & 1)
83 reg += spacing;
84
85 pm3386_reg_write(port >> 1, reg, value);
86}
87
88int pm3386_secondary_present(void)
89{
90 return pm3386_reg_read(1, 0) == 0x3386;
91}
92
93void pm3386_reset(void)
94{
95 u8 mac[3][6];
96 int secondary;
97
98 secondary = pm3386_secondary_present();
99
100 /* Save programmed MAC addresses. */
101 pm3386_get_mac(0, mac[0]);
102 pm3386_get_mac(1, mac[1]);
103 if (secondary)
104 pm3386_get_mac(2, mac[2]);
105
106 /* Assert analog and digital reset. */
107 pm3386_reg_write(0, 0x002, 0x0060);
108 if (secondary)
109 pm3386_reg_write(1, 0x002, 0x0060);
110 mdelay(1);
111
112 /* Deassert analog reset. */
113 pm3386_reg_write(0, 0x002, 0x0062);
114 if (secondary)
115 pm3386_reg_write(1, 0x002, 0x0062);
116 mdelay(10);
117
118 /* Deassert digital reset. */
119 pm3386_reg_write(0, 0x002, 0x0063);
120 if (secondary)
121 pm3386_reg_write(1, 0x002, 0x0063);
122 mdelay(10);
123
124 /* Restore programmed MAC addresses. */
125 pm3386_set_mac(0, mac[0]);
126 pm3386_set_mac(1, mac[1]);
127 if (secondary)
128 pm3386_set_mac(2, mac[2]);
129
130 /* Disable carrier on all ports. */
131 pm3386_set_carrier(0, 0);
132 pm3386_set_carrier(1, 0);
133 if (secondary)
134 pm3386_set_carrier(2, 0);
135}
136
137static u16 swaph(u16 x)
138{
139 return ((x << 8) | (x >> 8)) & 0xffff;
140}
141
142int pm3386_port_count(void)
143{
144 return 2 + pm3386_secondary_present();
145}
146
147void pm3386_init_port(int port)
148{
149 int pm = port >> 1;
150
151 /*
152 * Work around ENP2611 bootloader programming MAC address
153 * in reverse.
154 */
155 if (pm3386_port_reg_read(port, 0x30a, 0x100) == 0x0000 &&
156 (pm3386_port_reg_read(port, 0x309, 0x100) & 0xff00) == 0x5000) {
157 u16 temp[3];
158
159 temp[0] = pm3386_port_reg_read(port, 0x308, 0x100);
160 temp[1] = pm3386_port_reg_read(port, 0x309, 0x100);
161 temp[2] = pm3386_port_reg_read(port, 0x30a, 0x100);
162 pm3386_port_reg_write(port, 0x308, 0x100, swaph(temp[2]));
163 pm3386_port_reg_write(port, 0x309, 0x100, swaph(temp[1]));
164 pm3386_port_reg_write(port, 0x30a, 0x100, swaph(temp[0]));
165 }
166
167 /*
168 * Initialise narrowbanding mode. See application note 2010486
169 * for more information. (@@@ We also need to issue a reset
170 * when ROOL or DOOL are detected.)
171 */
172 pm3386_port_reg_write(port, 0x708, 0x10, 0xd055);
173 udelay(500);
174 pm3386_port_reg_write(port, 0x708, 0x10, 0x5055);
175
176 /*
177 * SPI-3 ingress block. Set 64 bytes SPI-3 burst size
178 * towards SPI-3 bridge.
179 */
180 pm3386_port_reg_write(port, 0x122, 0x20, 0x0002);
181
182 /*
183 * Enable ingress protocol checking, and soft reset the
184 * SPI-3 ingress block.
185 */
186 pm3386_reg_write(pm, 0x103, 0x0003);
187 while (!(pm3386_reg_read(pm, 0x103) & 0x80))
188 ;
189
190 /*
191 * SPI-3 egress block. Gather 12288 bytes of the current
192 * packet in the TX fifo before initiating transmit on the
193 * SERDES interface. (Prevents TX underflows.)
194 */
195 pm3386_port_reg_write(port, 0x221, 0x20, 0x0007);
196
197 /*
198 * Enforce odd parity from the SPI-3 bridge, and soft reset
199 * the SPI-3 egress block.
200 */
201 pm3386_reg_write(pm, 0x203, 0x000d & ~(4 << (port & 1)));
202 while ((pm3386_reg_read(pm, 0x203) & 0x000c) != 0x000c)
203 ;
204
205 /*
206 * EGMAC block. Set this channels to reject long preambles,
207 * not send or transmit PAUSE frames, enable preamble checking,
208 * disable frame length checking, enable FCS appending, enable
209 * TX frame padding.
210 */
211 pm3386_port_reg_write(port, 0x302, 0x100, 0x0113);
212
213 /*
214 * Soft reset the EGMAC block.
215 */
216 pm3386_port_reg_write(port, 0x301, 0x100, 0x8000);
217 pm3386_port_reg_write(port, 0x301, 0x100, 0x0000);
218
219 /*
220 * Auto-sense autonegotiation status.
221 */
222 pm3386_port_reg_write(port, 0x306, 0x100, 0x0100);
223
224 /*
225 * Allow reception of jumbo frames.
226 */
227 pm3386_port_reg_write(port, 0x310, 0x100, 9018);
228
229 /*
230 * Allow transmission of jumbo frames.
231 */
232 pm3386_port_reg_write(port, 0x336, 0x100, 9018);
233
234 /* @@@ Should set 0x337/0x437 (RX forwarding threshold.) */
235
236 /*
237 * Set autonegotiation parameters to 'no PAUSE, full duplex.'
238 */
239 pm3386_port_reg_write(port, 0x31c, 0x100, 0x0020);
240
241 /*
242 * Enable and restart autonegotiation.
243 */
244 pm3386_port_reg_write(port, 0x318, 0x100, 0x0003);
245 pm3386_port_reg_write(port, 0x318, 0x100, 0x0002);
246}
247
248void pm3386_get_mac(int port, u8 *mac)
249{
250 u16 temp;
251
252 temp = pm3386_port_reg_read(port, 0x308, 0x100);
253 mac[0] = temp & 0xff;
254 mac[1] = (temp >> 8) & 0xff;
255
256 temp = pm3386_port_reg_read(port, 0x309, 0x100);
257 mac[2] = temp & 0xff;
258 mac[3] = (temp >> 8) & 0xff;
259
260 temp = pm3386_port_reg_read(port, 0x30a, 0x100);
261 mac[4] = temp & 0xff;
262 mac[5] = (temp >> 8) & 0xff;
263}
264
265void pm3386_set_mac(int port, u8 *mac)
266{
267 pm3386_port_reg_write(port, 0x308, 0x100, (mac[1] << 8) | mac[0]);
268 pm3386_port_reg_write(port, 0x309, 0x100, (mac[3] << 8) | mac[2]);
269 pm3386_port_reg_write(port, 0x30a, 0x100, (mac[5] << 8) | mac[4]);
270}
271
272static u32 pm3386_get_stat(int port, u16 base)
273{
274 u32 value;
275
276 value = pm3386_port_reg_read(port, base, 0x100);
277 value |= pm3386_port_reg_read(port, base + 1, 0x100) << 16;
278
279 return value;
280}
281
282void pm3386_get_stats(int port, struct net_device_stats *stats)
283{
284 /*
285 * Snapshot statistics counters.
286 */
287 pm3386_port_reg_write(port, 0x500, 0x100, 0x0001);
288 while (pm3386_port_reg_read(port, 0x500, 0x100) & 0x0001)
289 ;
290
291 memset(stats, 0, sizeof(*stats));
292
293 stats->rx_packets = pm3386_get_stat(port, 0x510);
294 stats->tx_packets = pm3386_get_stat(port, 0x590);
295 stats->rx_bytes = pm3386_get_stat(port, 0x514);
296 stats->tx_bytes = pm3386_get_stat(port, 0x594);
297 /* @@@ Add other stats. */
298}
299
300void pm3386_set_carrier(int port, int state)
301{
302 pm3386_port_reg_write(port, 0x703, 0x10, state ? 0x1001 : 0x0000);
303}
304
305int pm3386_is_link_up(int port)
306{
307 u16 temp;
308
309 temp = pm3386_port_reg_read(port, 0x31a, 0x100);
310 temp = pm3386_port_reg_read(port, 0x31a, 0x100);
311
312 return !!(temp & 0x0002);
313}
314
315void pm3386_enable_rx(int port)
316{
317 u16 temp;
318
319 temp = pm3386_port_reg_read(port, 0x303, 0x100);
320 temp |= 0x1000;
321 pm3386_port_reg_write(port, 0x303, 0x100, temp);
322}
323
324void pm3386_disable_rx(int port)
325{
326 u16 temp;
327
328 temp = pm3386_port_reg_read(port, 0x303, 0x100);
329 temp &= 0xefff;
330 pm3386_port_reg_write(port, 0x303, 0x100, temp);
331}
332
333void pm3386_enable_tx(int port)
334{
335 u16 temp;
336
337 temp = pm3386_port_reg_read(port, 0x303, 0x100);
338 temp |= 0x4000;
339 pm3386_port_reg_write(port, 0x303, 0x100, temp);
340}
341
342void pm3386_disable_tx(int port)
343{
344 u16 temp;
345
346 temp = pm3386_port_reg_read(port, 0x303, 0x100);
347 temp &= 0xbfff;
348 pm3386_port_reg_write(port, 0x303, 0x100, temp);
349}
350
351MODULE_LICENSE("GPL");