drivers/net/wireless/hermes.c - android_kernel_htc_msm8960 - Gitiles

 /* hermes.c
  *
  * Driver core for the "Hermes" wireless MAC controller, as used in
  * the Lucent Orinoco and Cabletron RoamAbout cards. It should also
  * work on the hfa3841 and hfa3842 MAC controller chips used in the
  * Prism II chipsets.
  *
  * This is not a complete driver, just low-level access routines for
  * the MAC controller itself.
  *
  * Based on the prism2 driver from Absolute Value Systems' linux-wlan
  * project, the Linux wvlan_cs driver, Lucent's HCF-Light
  * (wvlan_hcf.c) library, and the NetBSD wireless driver (in no
  * particular order).
  *
  * Copyright (C) 2000, David Gibson, Linuxcare Australia.
  * (C) Copyright David Gibson, IBM Corp. 2001-2003.
  *
  * The contents of this file are subject to the Mozilla Public License
  * Version 1.1 (the "License"); you may not use this file except in
  * compliance with the License. You may obtain a copy of the License
  * at http://www.mozilla.org/MPL/
  *
  * Software distributed under the License is distributed on an "AS IS"
  * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
  * the License for the specific language governing rights and
  * limitations under the License.
  *
  * Alternatively, the contents of this file may be used under the
  * terms of the GNU General Public License version 2 (the "GPL"), in
  * which case the provisions of the GPL are applicable instead of the
  * above.  If you wish to allow the use of your version of this file
  * only under the terms of the GPL and not to allow others to use your
  * version of this file under the MPL, indicate your decision by
  * deleting the provisions above and replace them with the notice and
  * other provisions required by the GPL.  If you do not delete the
  * provisions above, a recipient may use your version of this file
  * under either the MPL or the GPL.
  */

 #include <linux/config.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/delay.h>

 #include "hermes.h"

 MODULE_DESCRIPTION("Low-level driver helper for Lucent Hermes chipset and Prism II HFA384x wireless MAC controller");
 MODULE_AUTHOR("Pavel Roskin <proski@gnu.org>"
 	" & David Gibson <hermes@gibson.dropbear.id.au>");
 MODULE_LICENSE("Dual MPL/GPL");

 /* These are maximum timeouts. Most often, card wil react much faster */
 #define CMD_BUSY_TIMEOUT (100) /* In iterations of ~1us */
 #define CMD_INIT_TIMEOUT (50000) /* in iterations of ~10us */
 #define CMD_COMPL_TIMEOUT (20000) /* in iterations of ~10us */
 #define ALLOC_COMPL_TIMEOUT (1000) /* in iterations of ~10us */

 /*
  * Debugging helpers
  */

 #define DMSG(stuff...) do {printk(KERN_DEBUG "hermes @ %p: " , hw->iobase); \
 			printk(stuff);} while (0)

 #undef HERMES_DEBUG
 #ifdef HERMES_DEBUG
 #include <stdarg.h>

 #define DEBUG(lvl, stuff...) if ( (lvl) <= HERMES_DEBUG) DMSG(stuff)

 #else /* ! HERMES_DEBUG */

 #define DEBUG(lvl, stuff...) do { } while (0)

 #endif /* ! HERMES_DEBUG */


 /*
  * Internal functions
  */

 /* Issue a command to the chip. Waiting for it to complete is the caller's
    problem.

    Returns -EBUSY if the command register is busy, 0 on success.

    Callable from any context.
 */
 static int hermes_issue_cmd(hermes_t *hw, u16 cmd, u16 param0)
 {
 	int k = CMD_BUSY_TIMEOUT;
 	u16 reg;

 	/* First wait for the command register to unbusy */
 	reg = hermes_read_regn(hw, CMD);
 	while ( (reg & HERMES_CMD_BUSY) && k ) {
 		k--;
 		udelay(1);
 		reg = hermes_read_regn(hw, CMD);
 	}
 	if (reg & HERMES_CMD_BUSY) {
 		return -EBUSY;
 	}

 	hermes_write_regn(hw, PARAM2, 0);
 	hermes_write_regn(hw, PARAM1, 0);
 	hermes_write_regn(hw, PARAM0, param0);
 	hermes_write_regn(hw, CMD, cmd);

 	return 0;
 }

 /*
  * Function definitions
  */

 void hermes_struct_init(hermes_t *hw, void __iomem *address, int reg_spacing)
 {
 	hw->iobase = address;
 	hw->reg_spacing = reg_spacing;
 	hw->inten = 0x0;

 #ifdef HERMES_DEBUG_BUFFER
 	hw->dbufp = 0;
 	memset(&hw->dbuf, 0xff, sizeof(hw->dbuf));
 	memset(&hw->profile, 0, sizeof(hw->profile));
 #endif
 }

 int hermes_init(hermes_t *hw)
 {
 	u16 status, reg;
 	int err = 0;
 	int k;

 	/* We don't want to be interrupted while resetting the chipset */
 	hw->inten = 0x0;
 	hermes_write_regn(hw, INTEN, 0);
 	hermes_write_regn(hw, EVACK, 0xffff);

 	/* Normally it's a "can't happen" for the command register to
            be busy when we go to issue a command because we are
            serializing all commands.  However we want to have some
            chance of resetting the card even if it gets into a stupid
            state, so we actually wait to see if the command register
            will unbusy itself here. */
 	k = CMD_BUSY_TIMEOUT;
 	reg = hermes_read_regn(hw, CMD);
 	while (k && (reg & HERMES_CMD_BUSY)) {
 		if (reg == 0xffff) /* Special case - the card has probably been removed,
 				      so don't wait for the timeout */
 			return -ENODEV;

 		k--;
 		udelay(1);
 		reg = hermes_read_regn(hw, CMD);
 	}

 	/* No need to explicitly handle the timeout - if we've timed
 	   out hermes_issue_cmd() will probably return -EBUSY below */

 	/* According to the documentation, EVSTAT may contain
 	   obsolete event occurrence information.  We have to acknowledge
 	   it by writing EVACK. */
 	reg = hermes_read_regn(hw, EVSTAT);
 	hermes_write_regn(hw, EVACK, reg);

 	/* We don't use hermes_docmd_wait here, because the reset wipes
 	   the magic constant in SWSUPPORT0 away, and it gets confused */
 	err = hermes_issue_cmd(hw, HERMES_CMD_INIT, 0);
 	if (err)
 		return err;

 	reg = hermes_read_regn(hw, EVSTAT);
 	k = CMD_INIT_TIMEOUT;
 	while ( (! (reg & HERMES_EV_CMD)) && k) {
 		k--;
 		udelay(10);
 		reg = hermes_read_regn(hw, EVSTAT);
 	}

 	hermes_write_regn(hw, SWSUPPORT0, HERMES_MAGIC);

 	if (! hermes_present(hw)) {
 		DEBUG(0, "hermes @ 0x%x: Card removed during reset.\n",
 		       hw->iobase);
 		err = -ENODEV;
 		goto out;
 	}

 	if (! (reg & HERMES_EV_CMD)) {
 		printk(KERN_ERR "hermes @ %p: "
 		       "Timeout waiting for card to reset (reg=0x%04x)!\n",
 		       hw->iobase, reg);
 		err = -ETIMEDOUT;
 		goto out;
 	}

 	status = hermes_read_regn(hw, STATUS);

 	hermes_write_regn(hw, EVACK, HERMES_EV_CMD);

 	if (status & HERMES_STATUS_RESULT)
 		err = -EIO;

  out:
 	return err;
 }

 /* Issue a command to the chip, and (busy!) wait for it to
  * complete.
  *
  * Returns: < 0 on internal error, 0 on success, > 0 on error returned by the firmware
  *
  * Callable from any context, but locking is your problem. */
 int hermes_docmd_wait(hermes_t *hw, u16 cmd, u16 parm0,
 		      struct hermes_response *resp)
 {
 	int err;
 	int k;
 	u16 reg;
 	u16 status;

 	err = hermes_issue_cmd(hw, cmd, parm0);
 	if (err) {
 		if (! hermes_present(hw)) {
 			if (net_ratelimit())
 				printk(KERN_WARNING "hermes @ %p: "
 				       "Card removed while issuing command "
 				       "0x%04x.\n", hw->iobase, cmd);
 			err = -ENODEV;
 		} else
 			if (net_ratelimit())
 				printk(KERN_ERR "hermes @ %p: "
 				       "Error %d issuing command 0x%04x.\n",
 				       hw->iobase, err, cmd);
 		goto out;
 	}

 	reg = hermes_read_regn(hw, EVSTAT);
 	k = CMD_COMPL_TIMEOUT;
 	while ( (! (reg & HERMES_EV_CMD)) && k) {
 		k--;
 		udelay(10);
 		reg = hermes_read_regn(hw, EVSTAT);
 	}

 	if (! hermes_present(hw)) {
 		printk(KERN_WARNING "hermes @ %p: Card removed "
 		       "while waiting for command 0x%04x completion.\n",
 		       hw->iobase, cmd);
 		err = -ENODEV;
 		goto out;
 	}

 	if (! (reg & HERMES_EV_CMD)) {
 		printk(KERN_ERR "hermes @ %p: Timeout waiting for "
 		       "command 0x%04x completion.\n", hw->iobase, cmd);
 		err = -ETIMEDOUT;
 		goto out;
 	}

 	status = hermes_read_regn(hw, STATUS);
 	if (resp) {
 		resp->status = status;
 		resp->resp0 = hermes_read_regn(hw, RESP0);
 		resp->resp1 = hermes_read_regn(hw, RESP1);
 		resp->resp2 = hermes_read_regn(hw, RESP2);
 	}

 	hermes_write_regn(hw, EVACK, HERMES_EV_CMD);

 	if (status & HERMES_STATUS_RESULT)
 		err = -EIO;

  out:
 	return err;
 }

 int hermes_allocate(hermes_t *hw, u16 size, u16 *fid)
 {
 	int err = 0;
 	int k;
 	u16 reg;

 	if ( (size < HERMES_ALLOC_LEN_MIN) || (size > HERMES_ALLOC_LEN_MAX) )
 		return -EINVAL;

 	err = hermes_docmd_wait(hw, HERMES_CMD_ALLOC, size, NULL);
 	if (err) {
 		return err;
 	}

 	reg = hermes_read_regn(hw, EVSTAT);
 	k = ALLOC_COMPL_TIMEOUT;
 	while ( (! (reg & HERMES_EV_ALLOC)) && k) {
 		k--;
 		udelay(10);
 		reg = hermes_read_regn(hw, EVSTAT);
 	}

 	if (! hermes_present(hw)) {
 		printk(KERN_WARNING "hermes @ %p: "
 		       "Card removed waiting for frame allocation.\n",
 		       hw->iobase);
 		return -ENODEV;
 	}

 	if (! (reg & HERMES_EV_ALLOC)) {
 		printk(KERN_ERR "hermes @ %p: "
 		       "Timeout waiting for frame allocation\n",
 		       hw->iobase);
 		return -ETIMEDOUT;
 	}

 	*fid = hermes_read_regn(hw, ALLOCFID);
 	hermes_write_regn(hw, EVACK, HERMES_EV_ALLOC);

 	return 0;
 }


 /* Set up a BAP to read a particular chunk of data from card's internal buffer.
  *
  * Returns: < 0 on internal failure (errno), 0 on success, >0 on error
  * from firmware
  *
  * Callable from any context */
 static int hermes_bap_seek(hermes_t *hw, int bap, u16 id, u16 offset)
 {
 	int sreg = bap ? HERMES_SELECT1 : HERMES_SELECT0;
 	int oreg = bap ? HERMES_OFFSET1 : HERMES_OFFSET0;
 	int k;
 	u16 reg;

 	/* Paranoia.. */
 	if ( (offset > HERMES_BAP_OFFSET_MAX) || (offset % 2) )
 		return -EINVAL;

 	k = HERMES_BAP_BUSY_TIMEOUT;
 	reg = hermes_read_reg(hw, oreg);
 	while ((reg & HERMES_OFFSET_BUSY) && k) {
 		k--;
 		udelay(1);
 		reg = hermes_read_reg(hw, oreg);
 	}

 #ifdef HERMES_DEBUG_BUFFER
 	hw->profile[HERMES_BAP_BUSY_TIMEOUT - k]++;

 	if (k < HERMES_BAP_BUSY_TIMEOUT) {
 		struct hermes_debug_entry *e =
 			&hw->dbuf[(hw->dbufp++) % HERMES_DEBUG_BUFSIZE];
 		e->bap = bap;
 		e->id = id;
 		e->offset = offset;
 		e->cycles = HERMES_BAP_BUSY_TIMEOUT - k;
 	}
 #endif

 	if (reg & HERMES_OFFSET_BUSY)
 		return -ETIMEDOUT;

 	/* Now we actually set up the transfer */
 	hermes_write_reg(hw, sreg, id);
 	hermes_write_reg(hw, oreg, offset);

 	/* Wait for the BAP to be ready */
 	k = HERMES_BAP_BUSY_TIMEOUT;
 	reg = hermes_read_reg(hw, oreg);
 	while ( (reg & (HERMES_OFFSET_BUSY | HERMES_OFFSET_ERR)) && k) {
 		k--;
 		udelay(1);
 		reg = hermes_read_reg(hw, oreg);
 	}

 	if (reg != offset) {
 		printk(KERN_ERR "hermes @ %p: BAP%d offset %s: "
 		       "reg=0x%x id=0x%x offset=0x%x\n", hw->iobase, bap,
 		       (reg & HERMES_OFFSET_BUSY) ? "timeout" : "error",
 		       reg, id, offset);

 		if (reg & HERMES_OFFSET_BUSY) {
 			return -ETIMEDOUT;
 		}

 		return -EIO;		/* error or wrong offset */
 	}

 	return 0;
 }

 /* Read a block of data from the chip's buffer, via the
  * BAP. Synchronization/serialization is the caller's problem.  len
  * must be even.
  *
  * Returns: < 0 on internal failure (errno), 0 on success, > 0 on error from firmware
  */
 int hermes_bap_pread(hermes_t *hw, int bap, void *buf, int len,
 		     u16 id, u16 offset)
 {
 	int dreg = bap ? HERMES_DATA1 : HERMES_DATA0;
 	int err = 0;

 	if ( (len < 0) || (len % 2) )
 		return -EINVAL;

 	err = hermes_bap_seek(hw, bap, id, offset);
 	if (err)
 		goto out;

 	/* Actually do the transfer */
 	hermes_read_words(hw, dreg, buf, len/2);

  out:
 	return err;
 }

 /* Write a block of data to the chip's buffer, via the
  * BAP. Synchronization/serialization is the caller's problem. len
  * must be even.
  *
  * Returns: < 0 on internal failure (errno), 0 on success, > 0 on error from firmware
  */
 int hermes_bap_pwrite(hermes_t *hw, int bap, const void *buf, int len,
 		      u16 id, u16 offset)
 {
 	int dreg = bap ? HERMES_DATA1 : HERMES_DATA0;
 	int err = 0;

 	if ( (len < 0) || (len % 2) )
 		return -EINVAL;

 	err = hermes_bap_seek(hw, bap, id, offset);
 	if (err)
 		goto out;

 	/* Actually do the transfer */
 	hermes_write_words(hw, dreg, buf, len/2);

  out:
 	return err;
 }

 /* Write a block of data to the chip's buffer with padding if
  * neccessary, via the BAP. Synchronization/serialization is the
  * caller's problem. len must be even.
  *
  * Returns: < 0 on internal failure (errno), 0 on success, > 0 on error from firmware
  */
 int hermes_bap_pwrite_pad(hermes_t *hw, int bap, const void *buf, unsigned data_len, int len,
 		      u16 id, u16 offset)
 {
 	int dreg = bap ? HERMES_DATA1 : HERMES_DATA0;
 	int err = 0;

 	if (len < 0 || len % 2 || data_len > len)
 		return -EINVAL;

 	err = hermes_bap_seek(hw, bap, id, offset);
 	if (err)
 		goto out;

 	/* Transfer all the complete words of data */
 	hermes_write_words(hw, dreg, buf, data_len/2);
 	/* If there is an odd byte left over pad and transfer it */
 	if (data_len & 1) {
 		u8 end[2];
 		end[1] = 0;
 		end[0] = ((unsigned char *)buf)[data_len - 1];
 		hermes_write_words(hw, dreg, end, 1);
 		data_len ++;
 	}
 	/* Now send zeros for the padding */
 	if (data_len < len)
 		hermes_clear_words(hw, dreg, (len - data_len) / 2);
 	/* Complete */
  out:
 	return err;
 }

 /* Read a Length-Type-Value record from the card.
  *
  * If length is NULL, we ignore the length read from the card, and
  * read the entire buffer regardless. This is useful because some of
  * the configuration records appear to have incorrect lengths in
  * practice.
  *
  * Callable from user or bh context.  */
 int hermes_read_ltv(hermes_t *hw, int bap, u16 rid, unsigned bufsize,
 		    u16 *length, void *buf)
 {
 	int err = 0;
 	int dreg = bap ? HERMES_DATA1 : HERMES_DATA0;
 	u16 rlength, rtype;
 	unsigned nwords;

 	if ( (bufsize < 0) || (bufsize % 2) )
 		return -EINVAL;

 	err = hermes_docmd_wait(hw, HERMES_CMD_ACCESS, rid, NULL);
 	if (err)
 		return err;

 	err = hermes_bap_seek(hw, bap, rid, 0);
 	if (err)
 		return err;

 	rlength = hermes_read_reg(hw, dreg);

 	if (! rlength)
 		return -ENODATA;

 	rtype = hermes_read_reg(hw, dreg);

 	if (length)
 		*length = rlength;

 	if (rtype != rid)
 		printk(KERN_WARNING "hermes @ %p: %s(): "
 		       "rid (0x%04x) does not match type (0x%04x)\n",
 		       hw->iobase, __FUNCTION__, rid, rtype);
 	if (HERMES_RECLEN_TO_BYTES(rlength) > bufsize)
 		printk(KERN_WARNING "hermes @ %p: "
 		       "Truncating LTV record from %d to %d bytes. "
 		       "(rid=0x%04x, len=0x%04x)\n", hw->iobase,
 		       HERMES_RECLEN_TO_BYTES(rlength), bufsize, rid, rlength);

 	nwords = min((unsigned)rlength - 1, bufsize / 2);
 	hermes_read_words(hw, dreg, buf, nwords);

 	return 0;
 }

 int hermes_write_ltv(hermes_t *hw, int bap, u16 rid,
 		     u16 length, const void *value)
 {
 	int dreg = bap ? HERMES_DATA1 : HERMES_DATA0;
 	int err = 0;
 	unsigned count;

 	if (length == 0)
 		return -EINVAL;

 	err = hermes_bap_seek(hw, bap, rid, 0);
 	if (err)
 		return err;

 	hermes_write_reg(hw, dreg, length);
 	hermes_write_reg(hw, dreg, rid);

 	count = length - 1;

 	hermes_write_words(hw, dreg, value, count);

 	err = hermes_docmd_wait(hw, HERMES_CMD_ACCESS | HERMES_CMD_WRITE,
 				rid, NULL);

 	return err;
 }

 EXPORT_SYMBOL(hermes_struct_init);
 EXPORT_SYMBOL(hermes_init);
 EXPORT_SYMBOL(hermes_docmd_wait);
 EXPORT_SYMBOL(hermes_allocate);

 EXPORT_SYMBOL(hermes_bap_pread);
 EXPORT_SYMBOL(hermes_bap_pwrite);
 EXPORT_SYMBOL(hermes_bap_pwrite_pad);
 EXPORT_SYMBOL(hermes_read_ltv);
 EXPORT_SYMBOL(hermes_write_ltv);

 static int __init init_hermes(void)
 {
 	return 0;
 }

 static void __exit exit_hermes(void)
 {
 }

 module_init(init_hermes);
 module_exit(exit_hermes);
	/* hermes.c
	*
	* Driver core for the "Hermes" wireless MAC controller, as used in
	* the Lucent Orinoco and Cabletron RoamAbout cards. It should also
	* work on the hfa3841 and hfa3842 MAC controller chips used in the
	* Prism II chipsets.
	*
	* This is not a complete driver, just low-level access routines for
	* the MAC controller itself.
	*
	* Based on the prism2 driver from Absolute Value Systems' linux-wlan
	* project, the Linux wvlan_cs driver, Lucent's HCF-Light
	* (wvlan_hcf.c) library, and the NetBSD wireless driver (in no
	* particular order).
	*
	* Copyright (C) 2000, David Gibson, Linuxcare Australia.
	* (C) Copyright David Gibson, IBM Corp. 2001-2003.
	*
	* The contents of this file are subject to the Mozilla Public License
	* Version 1.1 (the "License"); you may not use this file except in
	* compliance with the License. You may obtain a copy of the License
	* at http://www.mozilla.org/MPL/
	*
	* Software distributed under the License is distributed on an "AS IS"
	* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
	* the License for the specific language governing rights and
	* limitations under the License.
	*
	* Alternatively, the contents of this file may be used under the
	* terms of the GNU General Public License version 2 (the "GPL"), in
	* which case the provisions of the GPL are applicable instead of the
	* above. If you wish to allow the use of your version of this file
	* only under the terms of the GPL and not to allow others to use your
	* version of this file under the MPL, indicate your decision by
	* deleting the provisions above and replace them with the notice and
	* other provisions required by the GPL. If you do not delete the
	* provisions above, a recipient may use your version of this file
	* under either the MPL or the GPL.
	*/

	#include <linux/config.h>
	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/delay.h>

	#include "hermes.h"

	MODULE_DESCRIPTION("Low-level driver helper for Lucent Hermes chipset and Prism II HFA384x wireless MAC controller");
	MODULE_AUTHOR("Pavel Roskin <proski@gnu.org>"
	" & David Gibson <hermes@gibson.dropbear.id.au>");
	MODULE_LICENSE("Dual MPL/GPL");

	/* These are maximum timeouts. Most often, card wil react much faster */
	#define CMD_BUSY_TIMEOUT (100) /* In iterations of ~1us */
	#define CMD_INIT_TIMEOUT (50000) /* in iterations of ~10us */
	#define CMD_COMPL_TIMEOUT (20000) /* in iterations of ~10us */
	#define ALLOC_COMPL_TIMEOUT (1000) /* in iterations of ~10us */

	/*
	* Debugging helpers
	*/

	#define DMSG(stuff...) do {printk(KERN_DEBUG "hermes @ %p: " , hw->iobase); \
	printk(stuff);} while (0)

	#undef HERMES_DEBUG
	#ifdef HERMES_DEBUG
	#include <stdarg.h>

	#define DEBUG(lvl, stuff...) if ( (lvl) <= HERMES_DEBUG) DMSG(stuff)

	#else /* ! HERMES_DEBUG */

	#define DEBUG(lvl, stuff...) do { } while (0)

	#endif /* ! HERMES_DEBUG */


	/*
	* Internal functions
	*/

	/* Issue a command to the chip. Waiting for it to complete is the caller's
	problem.

	Returns -EBUSY if the command register is busy, 0 on success.

	Callable from any context.
	*/
	static int hermes_issue_cmd(hermes_t *hw, u16 cmd, u16 param0)
	{
	int k = CMD_BUSY_TIMEOUT;
	u16 reg;

	/* First wait for the command register to unbusy */
	reg = hermes_read_regn(hw, CMD);
	while ( (reg & HERMES_CMD_BUSY) && k ) {
	k--;
	udelay(1);
	reg = hermes_read_regn(hw, CMD);
	}
	if (reg & HERMES_CMD_BUSY) {
	return -EBUSY;
	}

	hermes_write_regn(hw, PARAM2, 0);
	hermes_write_regn(hw, PARAM1, 0);
	hermes_write_regn(hw, PARAM0, param0);
	hermes_write_regn(hw, CMD, cmd);

	return 0;
	}

	/*
	* Function definitions
	*/

	void hermes_struct_init(hermes_t hw, void __iomem address, int reg_spacing)
	{
	hw->iobase = address;
	hw->reg_spacing = reg_spacing;
	hw->inten = 0x0;

	#ifdef HERMES_DEBUG_BUFFER
	hw->dbufp = 0;
	memset(&hw->dbuf, 0xff, sizeof(hw->dbuf));
	memset(&hw->profile, 0, sizeof(hw->profile));
	#endif
	}

	int hermes_init(hermes_t *hw)
	{
	u16 status, reg;
	int err = 0;
	int k;

	/* We don't want to be interrupted while resetting the chipset */
	hw->inten = 0x0;
	hermes_write_regn(hw, INTEN, 0);
	hermes_write_regn(hw, EVACK, 0xffff);

	/* Normally it's a "can't happen" for the command register to
	be busy when we go to issue a command because we are
	serializing all commands. However we want to have some
	chance of resetting the card even if it gets into a stupid
	state, so we actually wait to see if the command register
	will unbusy itself here. */
	k = CMD_BUSY_TIMEOUT;
	reg = hermes_read_regn(hw, CMD);
	while (k && (reg & HERMES_CMD_BUSY)) {
	if (reg == 0xffff) /* Special case - the card has probably been removed,
	so don't wait for the timeout */
	return -ENODEV;

	k--;
	udelay(1);
	reg = hermes_read_regn(hw, CMD);
	}

	/* No need to explicitly handle the timeout - if we've timed
	out hermes_issue_cmd() will probably return -EBUSY below */

	/* According to the documentation, EVSTAT may contain
	obsolete event occurrence information. We have to acknowledge
	it by writing EVACK. */
	reg = hermes_read_regn(hw, EVSTAT);
	hermes_write_regn(hw, EVACK, reg);

	/* We don't use hermes_docmd_wait here, because the reset wipes
	the magic constant in SWSUPPORT0 away, and it gets confused */
	err = hermes_issue_cmd(hw, HERMES_CMD_INIT, 0);
	if (err)
	return err;

	reg = hermes_read_regn(hw, EVSTAT);
	k = CMD_INIT_TIMEOUT;
	while ( (! (reg & HERMES_EV_CMD)) && k) {
	k--;
	udelay(10);
	reg = hermes_read_regn(hw, EVSTAT);
	}

	hermes_write_regn(hw, SWSUPPORT0, HERMES_MAGIC);

	if (! hermes_present(hw)) {
	DEBUG(0, "hermes @ 0x%x: Card removed during reset.\n",
	hw->iobase);
	err = -ENODEV;
	goto out;
	}

	if (! (reg & HERMES_EV_CMD)) {
	printk(KERN_ERR "hermes @ %p: "
	"Timeout waiting for card to reset (reg=0x%04x)!\n",
	hw->iobase, reg);
	err = -ETIMEDOUT;
	goto out;
	}

	status = hermes_read_regn(hw, STATUS);

	hermes_write_regn(hw, EVACK, HERMES_EV_CMD);

	if (status & HERMES_STATUS_RESULT)
	err = -EIO;

	out:
	return err;
	}

	/* Issue a command to the chip, and (busy!) wait for it to
	* complete.
	*
	* Returns: < 0 on internal error, 0 on success, > 0 on error returned by the firmware
	*
	* Callable from any context, but locking is your problem. */
	int hermes_docmd_wait(hermes_t *hw, u16 cmd, u16 parm0,
	struct hermes_response *resp)
	{
	int err;
	int k;
	u16 reg;
	u16 status;

	err = hermes_issue_cmd(hw, cmd, parm0);
	if (err) {
	if (! hermes_present(hw)) {
	if (net_ratelimit())
	printk(KERN_WARNING "hermes @ %p: "
	"Card removed while issuing command "
	"0x%04x.\n", hw->iobase, cmd);
	err = -ENODEV;
	} else
	if (net_ratelimit())
	printk(KERN_ERR "hermes @ %p: "
	"Error %d issuing command 0x%04x.\n",
	hw->iobase, err, cmd);
	goto out;
	}

	reg = hermes_read_regn(hw, EVSTAT);
	k = CMD_COMPL_TIMEOUT;
	while ( (! (reg & HERMES_EV_CMD)) && k) {
	k--;
	udelay(10);
	reg = hermes_read_regn(hw, EVSTAT);
	}

	if (! hermes_present(hw)) {
	printk(KERN_WARNING "hermes @ %p: Card removed "
	"while waiting for command 0x%04x completion.\n",
	hw->iobase, cmd);
	err = -ENODEV;
	goto out;
	}

	if (! (reg & HERMES_EV_CMD)) {
	printk(KERN_ERR "hermes @ %p: Timeout waiting for "
	"command 0x%04x completion.\n", hw->iobase, cmd);
	err = -ETIMEDOUT;
	goto out;
	}

	status = hermes_read_regn(hw, STATUS);
	if (resp) {
	resp->status = status;
	resp->resp0 = hermes_read_regn(hw, RESP0);
	resp->resp1 = hermes_read_regn(hw, RESP1);
	resp->resp2 = hermes_read_regn(hw, RESP2);
	}

	hermes_write_regn(hw, EVACK, HERMES_EV_CMD);

	if (status & HERMES_STATUS_RESULT)
	err = -EIO;

	out:
	return err;
	}

	int hermes_allocate(hermes_t hw, u16 size, u16 fid)
	{
	int err = 0;
	int k;
	u16 reg;

	if ( (size < HERMES_ALLOC_LEN_MIN) \|\| (size > HERMES_ALLOC_LEN_MAX) )
	return -EINVAL;

	err = hermes_docmd_wait(hw, HERMES_CMD_ALLOC, size, NULL);
	if (err) {
	return err;
	}

	reg = hermes_read_regn(hw, EVSTAT);
	k = ALLOC_COMPL_TIMEOUT;
	while ( (! (reg & HERMES_EV_ALLOC)) && k) {
	k--;
	udelay(10);
	reg = hermes_read_regn(hw, EVSTAT);
	}

	if (! hermes_present(hw)) {
	printk(KERN_WARNING "hermes @ %p: "
	"Card removed waiting for frame allocation.\n",
	hw->iobase);
	return -ENODEV;
	}

	if (! (reg & HERMES_EV_ALLOC)) {
	printk(KERN_ERR "hermes @ %p: "
	"Timeout waiting for frame allocation\n",
	hw->iobase);
	return -ETIMEDOUT;
	}

	*fid = hermes_read_regn(hw, ALLOCFID);
	hermes_write_regn(hw, EVACK, HERMES_EV_ALLOC);

	return 0;
	}


	/* Set up a BAP to read a particular chunk of data from card's internal buffer.
	*
	* Returns: < 0 on internal failure (errno), 0 on success, >0 on error
	* from firmware
	*
	* Callable from any context */
	static int hermes_bap_seek(hermes_t *hw, int bap, u16 id, u16 offset)
	{
	int sreg = bap ? HERMES_SELECT1 : HERMES_SELECT0;
	int oreg = bap ? HERMES_OFFSET1 : HERMES_OFFSET0;
	int k;
	u16 reg;

	/* Paranoia.. */
	if ( (offset > HERMES_BAP_OFFSET_MAX) \|\| (offset % 2) )
	return -EINVAL;

	k = HERMES_BAP_BUSY_TIMEOUT;
	reg = hermes_read_reg(hw, oreg);
	while ((reg & HERMES_OFFSET_BUSY) && k) {
	k--;
	udelay(1);
	reg = hermes_read_reg(hw, oreg);
	}

	#ifdef HERMES_DEBUG_BUFFER
	hw->profile[HERMES_BAP_BUSY_TIMEOUT - k]++;

	if (k < HERMES_BAP_BUSY_TIMEOUT) {
	struct hermes_debug_entry *e =
	&hw->dbuf[(hw->dbufp++) % HERMES_DEBUG_BUFSIZE];
	e->bap = bap;
	e->id = id;
	e->offset = offset;
	e->cycles = HERMES_BAP_BUSY_TIMEOUT - k;
	}
	#endif

	if (reg & HERMES_OFFSET_BUSY)
	return -ETIMEDOUT;

	/* Now we actually set up the transfer */
	hermes_write_reg(hw, sreg, id);
	hermes_write_reg(hw, oreg, offset);

	/* Wait for the BAP to be ready */
	k = HERMES_BAP_BUSY_TIMEOUT;
	reg = hermes_read_reg(hw, oreg);
	while ( (reg & (HERMES_OFFSET_BUSY \| HERMES_OFFSET_ERR)) && k) {
	k--;
	udelay(1);
	reg = hermes_read_reg(hw, oreg);
	}

	if (reg != offset) {
	printk(KERN_ERR "hermes @ %p: BAP%d offset %s: "
	"reg=0x%x id=0x%x offset=0x%x\n", hw->iobase, bap,
	(reg & HERMES_OFFSET_BUSY) ? "timeout" : "error",
	reg, id, offset);

	if (reg & HERMES_OFFSET_BUSY) {
	return -ETIMEDOUT;
	}

	return -EIO; /* error or wrong offset */
	}

	return 0;
	}

	/* Read a block of data from the chip's buffer, via the
	* BAP. Synchronization/serialization is the caller's problem. len
	* must be even.
	*
	* Returns: < 0 on internal failure (errno), 0 on success, > 0 on error from firmware
	*/
	int hermes_bap_pread(hermes_t hw, int bap, void buf, int len,
	u16 id, u16 offset)
	{
	int dreg = bap ? HERMES_DATA1 : HERMES_DATA0;
	int err = 0;

	if ( (len < 0) \|\| (len % 2) )
	return -EINVAL;

	err = hermes_bap_seek(hw, bap, id, offset);
	if (err)
	goto out;

	/* Actually do the transfer */
	hermes_read_words(hw, dreg, buf, len/2);

	out:
	return err;
	}

	/* Write a block of data to the chip's buffer, via the
	* BAP. Synchronization/serialization is the caller's problem. len
	* must be even.
	*
	* Returns: < 0 on internal failure (errno), 0 on success, > 0 on error from firmware
	*/
	int hermes_bap_pwrite(hermes_t hw, int bap, const void buf, int len,
	u16 id, u16 offset)
	{
	int dreg = bap ? HERMES_DATA1 : HERMES_DATA0;
	int err = 0;

	if ( (len < 0) \|\| (len % 2) )
	return -EINVAL;

	err = hermes_bap_seek(hw, bap, id, offset);
	if (err)
	goto out;

	/* Actually do the transfer */
	hermes_write_words(hw, dreg, buf, len/2);

	out:
	return err;
	}

	/* Write a block of data to the chip's buffer with padding if
	* neccessary, via the BAP. Synchronization/serialization is the
	* caller's problem. len must be even.
	*
	* Returns: < 0 on internal failure (errno), 0 on success, > 0 on error from firmware
	*/
	int hermes_bap_pwrite_pad(hermes_t hw, int bap, const void buf, unsigned data_len, int len,
	u16 id, u16 offset)
	{
	int dreg = bap ? HERMES_DATA1 : HERMES_DATA0;
	int err = 0;

	if (len < 0 \|\| len % 2 \|\| data_len > len)
	return -EINVAL;

	err = hermes_bap_seek(hw, bap, id, offset);
	if (err)
	goto out;

	/* Transfer all the complete words of data */
	hermes_write_words(hw, dreg, buf, data_len/2);
	/* If there is an odd byte left over pad and transfer it */
	if (data_len & 1) {
	u8 end[2];
	end[1] = 0;
	end[0] = ((unsigned char *)buf)[data_len - 1];
	hermes_write_words(hw, dreg, end, 1);
	data_len ++;
	}
	/* Now send zeros for the padding */
	if (data_len < len)
	hermes_clear_words(hw, dreg, (len - data_len) / 2);
	/* Complete */
	out:
	return err;
	}

	/* Read a Length-Type-Value record from the card.
	*
	* If length is NULL, we ignore the length read from the card, and
	* read the entire buffer regardless. This is useful because some of
	* the configuration records appear to have incorrect lengths in
	* practice.
	*
	* Callable from user or bh context. */
	int hermes_read_ltv(hermes_t *hw, int bap, u16 rid, unsigned bufsize,
	u16 length, void buf)
	{
	int err = 0;
	int dreg = bap ? HERMES_DATA1 : HERMES_DATA0;
	u16 rlength, rtype;
	unsigned nwords;

	if ( (bufsize < 0) \|\| (bufsize % 2) )
	return -EINVAL;

	err = hermes_docmd_wait(hw, HERMES_CMD_ACCESS, rid, NULL);
	if (err)
	return err;

	err = hermes_bap_seek(hw, bap, rid, 0);
	if (err)
	return err;

	rlength = hermes_read_reg(hw, dreg);

	if (! rlength)
	return -ENODATA;

	rtype = hermes_read_reg(hw, dreg);

	if (length)
	*length = rlength;

	if (rtype != rid)
	printk(KERN_WARNING "hermes @ %p: %s(): "
	"rid (0x%04x) does not match type (0x%04x)\n",
	hw->iobase, __FUNCTION__, rid, rtype);
	if (HERMES_RECLEN_TO_BYTES(rlength) > bufsize)
	printk(KERN_WARNING "hermes @ %p: "
	"Truncating LTV record from %d to %d bytes. "
	"(rid=0x%04x, len=0x%04x)\n", hw->iobase,
	HERMES_RECLEN_TO_BYTES(rlength), bufsize, rid, rlength);

	nwords = min((unsigned)rlength - 1, bufsize / 2);
	hermes_read_words(hw, dreg, buf, nwords);

	return 0;
	}

	int hermes_write_ltv(hermes_t *hw, int bap, u16 rid,
	u16 length, const void *value)
	{
	int dreg = bap ? HERMES_DATA1 : HERMES_DATA0;
	int err = 0;
	unsigned count;

	if (length == 0)
	return -EINVAL;

	err = hermes_bap_seek(hw, bap, rid, 0);
	if (err)
	return err;

	hermes_write_reg(hw, dreg, length);
	hermes_write_reg(hw, dreg, rid);

	count = length - 1;

	hermes_write_words(hw, dreg, value, count);

	err = hermes_docmd_wait(hw, HERMES_CMD_ACCESS \| HERMES_CMD_WRITE,
	rid, NULL);

	return err;
	}

	EXPORT_SYMBOL(hermes_struct_init);
	EXPORT_SYMBOL(hermes_init);
	EXPORT_SYMBOL(hermes_docmd_wait);
	EXPORT_SYMBOL(hermes_allocate);

	EXPORT_SYMBOL(hermes_bap_pread);
	EXPORT_SYMBOL(hermes_bap_pwrite);
	EXPORT_SYMBOL(hermes_bap_pwrite_pad);
	EXPORT_SYMBOL(hermes_read_ltv);
	EXPORT_SYMBOL(hermes_write_ltv);

	static int __init init_hermes(void)
	{
	return 0;
	}

	static void __exit exit_hermes(void)
	{
	}

	module_init(init_hermes);
	module_exit(exit_hermes);