3 * Driver core for the "Hermes" wireless MAC controller, as used in
4 * the Lucent Orinoco and Cabletron RoamAbout cards. It should also
5 * work on the hfa3841 and hfa3842 MAC controller chips used in the
8 * This is not a complete driver, just low-level access routines for
9 * the MAC controller itself.
11 * Based on the prism2 driver from Absolute Value Systems' linux-wlan
12 * project, the Linux wvlan_cs driver, Lucent's HCF-Light
13 * (wvlan_hcf.c) library, and the NetBSD wireless driver (in no
16 * Copyright (C) 2000, David Gibson, Linuxcare Australia.
17 * (C) Copyright David Gibson, IBM Corp. 2001-2003.
19 * The contents of this file are subject to the Mozilla Public License
20 * Version 1.1 (the "License"); you may not use this file except in
21 * compliance with the License. You may obtain a copy of the License
22 * at http://www.mozilla.org/MPL/
24 * Software distributed under the License is distributed on an "AS IS"
25 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
26 * the License for the specific language governing rights and
27 * limitations under the License.
29 * Alternatively, the contents of this file may be used under the
30 * terms of the GNU General Public License version 2 (the "GPL"), in
31 * which case the provisions of the GPL are applicable instead of the
32 * above. If you wish to allow the use of your version of this file
33 * only under the terms of the GPL and not to allow others to use your
34 * version of this file under the MPL, indicate your decision by
35 * deleting the provisions above and replace them with the notice and
36 * other provisions required by the GPL. If you do not delete the
37 * provisions above, a recipient may use your version of this file
38 * under either the MPL or the GPL.
41 #include <linux/module.h>
42 #include <linux/kernel.h>
43 #include <linux/init.h>
44 #include <linux/delay.h>
48 MODULE_DESCRIPTION("Low-level driver helper for Lucent Hermes chipset and Prism II HFA384x wireless MAC controller");
49 MODULE_AUTHOR("Pavel Roskin <proski@gnu.org>"
50 " & David Gibson <hermes@gibson.dropbear.id.au>");
51 MODULE_LICENSE("Dual MPL/GPL");
53 /* These are maximum timeouts. Most often, card wil react much faster */
54 #define CMD_BUSY_TIMEOUT (100) /* In iterations of ~1us */
55 #define CMD_INIT_TIMEOUT (50000) /* in iterations of ~10us */
56 #define CMD_COMPL_TIMEOUT (20000) /* in iterations of ~10us */
57 #define ALLOC_COMPL_TIMEOUT (1000) /* in iterations of ~10us */
63 #define DMSG(stuff...) do {printk(KERN_DEBUG "hermes @ %p: " , hw->iobase); \
64 printk(stuff);} while (0)
70 #define DEBUG(lvl, stuff...) if ( (lvl) <= HERMES_DEBUG) DMSG(stuff)
72 #else /* ! HERMES_DEBUG */
74 #define DEBUG(lvl, stuff...) do { } while (0)
76 #endif /* ! HERMES_DEBUG */
83 /* Issue a command to the chip. Waiting for it to complete is the caller's
86 Returns -EBUSY if the command register is busy, 0 on success.
88 Callable from any context.
90 static int hermes_issue_cmd(hermes_t *hw, u16 cmd, u16 param0,
91 u16 param1, u16 param2)
93 int k = CMD_BUSY_TIMEOUT;
96 /* First wait for the command register to unbusy */
97 reg = hermes_read_regn(hw, CMD);
98 while ( (reg & HERMES_CMD_BUSY) && k ) {
101 reg = hermes_read_regn(hw, CMD);
103 if (reg & HERMES_CMD_BUSY) {
107 hermes_write_regn(hw, PARAM2, param2);
108 hermes_write_regn(hw, PARAM1, param1);
109 hermes_write_regn(hw, PARAM0, param0);
110 hermes_write_regn(hw, CMD, cmd);
116 * Function definitions
119 void hermes_struct_init(hermes_t *hw, void __iomem *address, int reg_spacing)
121 hw->iobase = address;
122 hw->reg_spacing = reg_spacing;
125 EXPORT_SYMBOL(hermes_struct_init);
127 int hermes_init(hermes_t *hw)
133 /* We don't want to be interrupted while resetting the chipset */
135 hermes_write_regn(hw, INTEN, 0);
136 hermes_write_regn(hw, EVACK, 0xffff);
138 /* Normally it's a "can't happen" for the command register to
139 be busy when we go to issue a command because we are
140 serializing all commands. However we want to have some
141 chance of resetting the card even if it gets into a stupid
142 state, so we actually wait to see if the command register
143 will unbusy itself here. */
144 k = CMD_BUSY_TIMEOUT;
145 reg = hermes_read_regn(hw, CMD);
146 while (k && (reg & HERMES_CMD_BUSY)) {
147 if (reg == 0xffff) /* Special case - the card has probably been removed,
148 so don't wait for the timeout */
153 reg = hermes_read_regn(hw, CMD);
156 /* No need to explicitly handle the timeout - if we've timed
157 out hermes_issue_cmd() will probably return -EBUSY below */
159 /* According to the documentation, EVSTAT may contain
160 obsolete event occurrence information. We have to acknowledge
161 it by writing EVACK. */
162 reg = hermes_read_regn(hw, EVSTAT);
163 hermes_write_regn(hw, EVACK, reg);
165 /* We don't use hermes_docmd_wait here, because the reset wipes
166 the magic constant in SWSUPPORT0 away, and it gets confused */
167 err = hermes_issue_cmd(hw, HERMES_CMD_INIT, 0, 0, 0);
171 reg = hermes_read_regn(hw, EVSTAT);
172 k = CMD_INIT_TIMEOUT;
173 while ( (! (reg & HERMES_EV_CMD)) && k) {
176 reg = hermes_read_regn(hw, EVSTAT);
179 hermes_write_regn(hw, SWSUPPORT0, HERMES_MAGIC);
181 if (! hermes_present(hw)) {
182 DEBUG(0, "hermes @ 0x%x: Card removed during reset.\n",
188 if (! (reg & HERMES_EV_CMD)) {
189 printk(KERN_ERR "hermes @ %p: "
190 "Timeout waiting for card to reset (reg=0x%04x)!\n",
196 status = hermes_read_regn(hw, STATUS);
198 hermes_write_regn(hw, EVACK, HERMES_EV_CMD);
200 if (status & HERMES_STATUS_RESULT)
206 EXPORT_SYMBOL(hermes_init);
208 /* Issue a command to the chip, and (busy!) wait for it to
211 * Returns: < 0 on internal error, 0 on success, > 0 on error returned by the firmware
213 * Callable from any context, but locking is your problem. */
214 int hermes_docmd_wait(hermes_t *hw, u16 cmd, u16 parm0,
215 struct hermes_response *resp)
222 err = hermes_issue_cmd(hw, cmd, parm0, 0, 0);
224 if (! hermes_present(hw)) {
226 printk(KERN_WARNING "hermes @ %p: "
227 "Card removed while issuing command "
228 "0x%04x.\n", hw->iobase, cmd);
232 printk(KERN_ERR "hermes @ %p: "
233 "Error %d issuing command 0x%04x.\n",
234 hw->iobase, err, cmd);
238 reg = hermes_read_regn(hw, EVSTAT);
239 k = CMD_COMPL_TIMEOUT;
240 while ( (! (reg & HERMES_EV_CMD)) && k) {
243 reg = hermes_read_regn(hw, EVSTAT);
246 if (! hermes_present(hw)) {
247 printk(KERN_WARNING "hermes @ %p: Card removed "
248 "while waiting for command 0x%04x completion.\n",
254 if (! (reg & HERMES_EV_CMD)) {
255 printk(KERN_ERR "hermes @ %p: Timeout waiting for "
256 "command 0x%04x completion.\n", hw->iobase, cmd);
261 status = hermes_read_regn(hw, STATUS);
263 resp->status = status;
264 resp->resp0 = hermes_read_regn(hw, RESP0);
265 resp->resp1 = hermes_read_regn(hw, RESP1);
266 resp->resp2 = hermes_read_regn(hw, RESP2);
269 hermes_write_regn(hw, EVACK, HERMES_EV_CMD);
271 if (status & HERMES_STATUS_RESULT)
277 EXPORT_SYMBOL(hermes_docmd_wait);
279 int hermes_allocate(hermes_t *hw, u16 size, u16 *fid)
285 if ( (size < HERMES_ALLOC_LEN_MIN) || (size > HERMES_ALLOC_LEN_MAX) )
288 err = hermes_docmd_wait(hw, HERMES_CMD_ALLOC, size, NULL);
293 reg = hermes_read_regn(hw, EVSTAT);
294 k = ALLOC_COMPL_TIMEOUT;
295 while ( (! (reg & HERMES_EV_ALLOC)) && k) {
298 reg = hermes_read_regn(hw, EVSTAT);
301 if (! hermes_present(hw)) {
302 printk(KERN_WARNING "hermes @ %p: "
303 "Card removed waiting for frame allocation.\n",
308 if (! (reg & HERMES_EV_ALLOC)) {
309 printk(KERN_ERR "hermes @ %p: "
310 "Timeout waiting for frame allocation\n",
315 *fid = hermes_read_regn(hw, ALLOCFID);
316 hermes_write_regn(hw, EVACK, HERMES_EV_ALLOC);
320 EXPORT_SYMBOL(hermes_allocate);
322 /* Set up a BAP to read a particular chunk of data from card's internal buffer.
324 * Returns: < 0 on internal failure (errno), 0 on success, >0 on error
327 * Callable from any context */
328 static int hermes_bap_seek(hermes_t *hw, int bap, u16 id, u16 offset)
330 int sreg = bap ? HERMES_SELECT1 : HERMES_SELECT0;
331 int oreg = bap ? HERMES_OFFSET1 : HERMES_OFFSET0;
336 if ( (offset > HERMES_BAP_OFFSET_MAX) || (offset % 2) )
339 k = HERMES_BAP_BUSY_TIMEOUT;
340 reg = hermes_read_reg(hw, oreg);
341 while ((reg & HERMES_OFFSET_BUSY) && k) {
344 reg = hermes_read_reg(hw, oreg);
347 if (reg & HERMES_OFFSET_BUSY)
350 /* Now we actually set up the transfer */
351 hermes_write_reg(hw, sreg, id);
352 hermes_write_reg(hw, oreg, offset);
354 /* Wait for the BAP to be ready */
355 k = HERMES_BAP_BUSY_TIMEOUT;
356 reg = hermes_read_reg(hw, oreg);
357 while ( (reg & (HERMES_OFFSET_BUSY | HERMES_OFFSET_ERR)) && k) {
360 reg = hermes_read_reg(hw, oreg);
364 printk(KERN_ERR "hermes @ %p: BAP%d offset %s: "
365 "reg=0x%x id=0x%x offset=0x%x\n", hw->iobase, bap,
366 (reg & HERMES_OFFSET_BUSY) ? "timeout" : "error",
369 if (reg & HERMES_OFFSET_BUSY) {
373 return -EIO; /* error or wrong offset */
379 /* Read a block of data from the chip's buffer, via the
380 * BAP. Synchronization/serialization is the caller's problem. len
383 * Returns: < 0 on internal failure (errno), 0 on success, > 0 on error from firmware
385 int hermes_bap_pread(hermes_t *hw, int bap, void *buf, int len,
388 int dreg = bap ? HERMES_DATA1 : HERMES_DATA0;
391 if ( (len < 0) || (len % 2) )
394 err = hermes_bap_seek(hw, bap, id, offset);
398 /* Actually do the transfer */
399 hermes_read_words(hw, dreg, buf, len/2);
404 EXPORT_SYMBOL(hermes_bap_pread);
406 /* Write a block of data to the chip's buffer, via the
407 * BAP. Synchronization/serialization is the caller's problem.
409 * Returns: < 0 on internal failure (errno), 0 on success, > 0 on error from firmware
411 int hermes_bap_pwrite(hermes_t *hw, int bap, const void *buf, int len,
414 int dreg = bap ? HERMES_DATA1 : HERMES_DATA0;
420 err = hermes_bap_seek(hw, bap, id, offset);
424 /* Actually do the transfer */
425 hermes_write_bytes(hw, dreg, buf, len);
430 EXPORT_SYMBOL(hermes_bap_pwrite);
432 /* Read a Length-Type-Value record from the card.
434 * If length is NULL, we ignore the length read from the card, and
435 * read the entire buffer regardless. This is useful because some of
436 * the configuration records appear to have incorrect lengths in
439 * Callable from user or bh context. */
440 int hermes_read_ltv(hermes_t *hw, int bap, u16 rid, unsigned bufsize,
441 u16 *length, void *buf)
444 int dreg = bap ? HERMES_DATA1 : HERMES_DATA0;
448 if ( (bufsize < 0) || (bufsize % 2) )
451 err = hermes_docmd_wait(hw, HERMES_CMD_ACCESS, rid, NULL);
455 err = hermes_bap_seek(hw, bap, rid, 0);
459 rlength = hermes_read_reg(hw, dreg);
464 rtype = hermes_read_reg(hw, dreg);
470 printk(KERN_WARNING "hermes @ %p: %s(): "
471 "rid (0x%04x) does not match type (0x%04x)\n",
472 hw->iobase, __func__, rid, rtype);
473 if (HERMES_RECLEN_TO_BYTES(rlength) > bufsize)
474 printk(KERN_WARNING "hermes @ %p: "
475 "Truncating LTV record from %d to %d bytes. "
476 "(rid=0x%04x, len=0x%04x)\n", hw->iobase,
477 HERMES_RECLEN_TO_BYTES(rlength), bufsize, rid, rlength);
479 nwords = min((unsigned)rlength - 1, bufsize / 2);
480 hermes_read_words(hw, dreg, buf, nwords);
484 EXPORT_SYMBOL(hermes_read_ltv);
486 int hermes_write_ltv(hermes_t *hw, int bap, u16 rid,
487 u16 length, const void *value)
489 int dreg = bap ? HERMES_DATA1 : HERMES_DATA0;
496 err = hermes_bap_seek(hw, bap, rid, 0);
500 hermes_write_reg(hw, dreg, length);
501 hermes_write_reg(hw, dreg, rid);
505 hermes_write_bytes(hw, dreg, value, count << 1);
507 err = hermes_docmd_wait(hw, HERMES_CMD_ACCESS | HERMES_CMD_WRITE,
512 EXPORT_SYMBOL(hermes_write_ltv);
514 static int __init init_hermes(void)
519 static void __exit exit_hermes(void)
523 module_init(init_hermes);
524 module_exit(exit_hermes);