[deliverable/linux.git] / drivers / net / wireless / hermes.c

/* 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/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;
}

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);
	}

	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.
 *
 * 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)
		return -EINVAL;

	err = hermes_bap_seek(hw, bap, id, offset);
	if (err)
		goto out;
	
	/* Actually do the transfer */
	hermes_write_bytes(hw, dreg, buf, len);

 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_bytes(hw, dreg, value, count << 1);

	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_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);
Commit	Line	Data
1da177e4 LT	1	/* hermes.c
	2	*
	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
	6	* Prism II chipsets.
	7	*
	8	* This is not a complete driver, just low-level access routines for
	9	* the MAC controller itself.
	10	*
	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
	14	* particular order).
	15	*
	16	* Copyright (C) 2000, David Gibson, Linuxcare Australia.
	17	* (C) Copyright David Gibson, IBM Corp. 2001-2003.
	18	*
	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/
	23	*
	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.
	28	*
	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.
	39	*/
	40
1da177e4	41	#include <linux/module.h>
1da177e4	42	#include <linux/kernel.h>
ef846bf0 PR	43	#include <linux/init.h>
ef846bf0 PR	44	#include <linux/delay.h>
1da177e4 LT	45
	46	#include "hermes.h"
	47
	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");
	52
	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 */
	58
	59	/*
	60	* Debugging helpers
	61	*/
	62
	63	#define DMSG(stuff...) do {printk(KERN_DEBUG "hermes @ %p: " , hw->iobase); \
	64	printk(stuff);} while (0)
	65
	66	#undef HERMES_DEBUG
	67	#ifdef HERMES_DEBUG
	68	#include <stdarg.h>
	69
	70	#define DEBUG(lvl, stuff...) if ( (lvl) <= HERMES_DEBUG) DMSG(stuff)
	71
	72	#else /* ! HERMES_DEBUG */
	73
	74	#define DEBUG(lvl, stuff...) do { } while (0)
	75
	76	#endif /* ! HERMES_DEBUG */
	77
	78
	79	/*
	80	* Internal functions
	81	*/
	82
	83	/* Issue a command to the chip. Waiting for it to complete is the caller's
	84	problem.
	85
	86	Returns -EBUSY if the command register is busy, 0 on success.
	87
	88	Callable from any context.
	89	*/
	90	static int hermes_issue_cmd(hermes_t *hw, u16 cmd, u16 param0)
	91	{
	92	int k = CMD_BUSY_TIMEOUT;
	93	u16 reg;
	94
	95	/* First wait for the command register to unbusy */
	96	reg = hermes_read_regn(hw, CMD);
	97	while ( (reg & HERMES_CMD_BUSY) && k ) {
	98	k--;
	99	udelay(1);
	100	reg = hermes_read_regn(hw, CMD);
	101	}
	102	if (reg & HERMES_CMD_BUSY) {
	103	return -EBUSY;
	104	}
	105
	106	hermes_write_regn(hw, PARAM2, 0);
	107	hermes_write_regn(hw, PARAM1, 0);
	108	hermes_write_regn(hw, PARAM0, param0);
109	hermes_write_regn(hw, CMD, cmd);
110
111	return 0;
112	}
113
114	/*
115	* Function definitions
116	*/
117
118	void hermes_struct_init(hermes_t hw, void __iomem address, int reg_spacing)
119	{
120	hw->iobase = address;
121	hw->reg_spacing = reg_spacing;
122	hw->inten = 0x0;
1da177e4 LT	123	}
	124
	125	int hermes_init(hermes_t *hw)
	126	{
	127	u16 status, reg;
	128	int err = 0;
	129	int k;
	130
	131	/* We don't want to be interrupted while resetting the chipset */
	132	hw->inten = 0x0;
	133	hermes_write_regn(hw, INTEN, 0);
	134	hermes_write_regn(hw, EVACK, 0xffff);
	135
	136	/* Normally it's a "can't happen" for the command register to
	137	be busy when we go to issue a command because we are
	138	serializing all commands. However we want to have some
	139	chance of resetting the card even if it gets into a stupid
	140	state, so we actually wait to see if the command register
	141	will unbusy itself here. */
	142	k = CMD_BUSY_TIMEOUT;
	143	reg = hermes_read_regn(hw, CMD);
	144	while (k && (reg & HERMES_CMD_BUSY)) {
	145	if (reg == 0xffff) /* Special case - the card has probably been removed,
	146	so don't wait for the timeout */
	147	return -ENODEV;
	148
	149	k--;
	150	udelay(1);
	151	reg = hermes_read_regn(hw, CMD);
	152	}
	153
	154	/* No need to explicitly handle the timeout - if we've timed
	155	out hermes_issue_cmd() will probably return -EBUSY below */
	156
	157	/* According to the documentation, EVSTAT may contain
	158	obsolete event occurrence information. We have to acknowledge
	159	it by writing EVACK. */
	160	reg = hermes_read_regn(hw, EVSTAT);
	161	hermes_write_regn(hw, EVACK, reg);
	162
	163	/* We don't use hermes_docmd_wait here, because the reset wipes
	164	the magic constant in SWSUPPORT0 away, and it gets confused */
	165	err = hermes_issue_cmd(hw, HERMES_CMD_INIT, 0);
	166	if (err)
	167	return err;
	168
	169	reg = hermes_read_regn(hw, EVSTAT);
	170	k = CMD_INIT_TIMEOUT;
	171	while ( (! (reg & HERMES_EV_CMD)) && k) {
	172	k--;
	173	udelay(10);
	174	reg = hermes_read_regn(hw, EVSTAT);
	175	}
	176
	177	hermes_write_regn(hw, SWSUPPORT0, HERMES_MAGIC);
	178
	179	if (! hermes_present(hw)) {
	180	DEBUG(0, "hermes @ 0x%x: Card removed during reset.\n",
	181	hw->iobase);
	182	err = -ENODEV;
	183	goto out;
	184	}
	185
	186	if (! (reg & HERMES_EV_CMD)) {
187	printk(KERN_ERR "hermes @ %p: "
188	"Timeout waiting for card to reset (reg=0x%04x)!\n",
189	hw->iobase, reg);
190	err = -ETIMEDOUT;
191	goto out;
192	}
193
194	status = hermes_read_regn(hw, STATUS);
195
196	hermes_write_regn(hw, EVACK, HERMES_EV_CMD);
197
198	if (status & HERMES_STATUS_RESULT)
199	err = -EIO;
200
201	out:
202	return err;
203	}
204
205	/* Issue a command to the chip, and (busy!) wait for it to
206	* complete.
207	*
208	* Returns: < 0 on internal error, 0 on success, > 0 on error returned by the firmware
209	*
210	* Callable from any context, but locking is your problem. */
211	int hermes_docmd_wait(hermes_t *hw, u16 cmd, u16 parm0,
212	struct hermes_response *resp)
213	{
214	int err;
215	int k;
216	u16 reg;
217	u16 status;
218
219	err = hermes_issue_cmd(hw, cmd, parm0);
220	if (err) {
221	if (! hermes_present(hw)) {
222	if (net_ratelimit())
223	printk(KERN_WARNING "hermes @ %p: "
224	"Card removed while issuing command "
225	"0x%04x.\n", hw->iobase, cmd);
226	err = -ENODEV;
227	} else
228	if (net_ratelimit())
229	printk(KERN_ERR "hermes @ %p: "
230	"Error %d issuing command 0x%04x.\n",
231	hw->iobase, err, cmd);
232	goto out;
233	}
234
235	reg = hermes_read_regn(hw, EVSTAT);
236	k = CMD_COMPL_TIMEOUT;
237	while ( (! (reg & HERMES_EV_CMD)) && k) {
238	k--;
239	udelay(10);
240	reg = hermes_read_regn(hw, EVSTAT);
241	}
242
243	if (! hermes_present(hw)) {
244	printk(KERN_WARNING "hermes @ %p: Card removed "
245	"while waiting for command 0x%04x completion.\n",
246	hw->iobase, cmd);
247	err = -ENODEV;
248	goto out;
249	}
250
251	if (! (reg & HERMES_EV_CMD)) {
252	printk(KERN_ERR "hermes @ %p: Timeout waiting for "
253	"command 0x%04x completion.\n", hw->iobase, cmd);
254	err = -ETIMEDOUT;
255	goto out;
256	}
257
258	status = hermes_read_regn(hw, STATUS);
259	if (resp) {
260	resp->status = status;
261	resp->resp0 = hermes_read_regn(hw, RESP0);
262	resp->resp1 = hermes_read_regn(hw, RESP1);
263	resp->resp2 = hermes_read_regn(hw, RESP2);
264	}
265
266	hermes_write_regn(hw, EVACK, HERMES_EV_CMD);
267
268	if (status & HERMES_STATUS_RESULT)
269	err = -EIO;
270
271	out:
272	return err;
273	}
274
275	int hermes_allocate(hermes_t hw, u16 size, u16 fid)
276	{
277	int err = 0;
278	int k;
279	u16 reg;
280
281	if ( (size < HERMES_ALLOC_LEN_MIN) \|\| (size > HERMES_ALLOC_LEN_MAX) )
282	return -EINVAL;
283
284	err = hermes_docmd_wait(hw, HERMES_CMD_ALLOC, size, NULL);
285	if (err) {
286	return err;
287	}
288
289	reg = hermes_read_regn(hw, EVSTAT);
290	k = ALLOC_COMPL_TIMEOUT;
291	while ( (! (reg & HERMES_EV_ALLOC)) && k) {
292	k--;
293	udelay(10);
294	reg = hermes_read_regn(hw, EVSTAT);
295	}
296
297	if (! hermes_present(hw)) {
298	printk(KERN_WARNING "hermes @ %p: "
299	"Card removed waiting for frame allocation.\n",
300	hw->iobase);
301	return -ENODEV;
302	}
303
304	if (! (reg & HERMES_EV_ALLOC)) {
305	printk(KERN_ERR "hermes @ %p: "
306	"Timeout waiting for frame allocation\n",
307	hw->iobase);
308	return -ETIMEDOUT;
309	}
310
311	*fid = hermes_read_regn(hw, ALLOCFID);
312	hermes_write_regn(hw, EVACK, HERMES_EV_ALLOC);
313
314	return 0;
315	}
316
317
318	/* Set up a BAP to read a particular chunk of data from card's internal buffer.
319	*
320	* Returns: < 0 on internal failure (errno), 0 on success, >0 on error
321	* from firmware
322	*
323	* Callable from any context */
324	static int hermes_bap_seek(hermes_t *hw, int bap, u16 id, u16 offset)
325	{
326	int sreg = bap ? HERMES_SELECT1 : HERMES_SELECT0;
327	int oreg = bap ? HERMES_OFFSET1 : HERMES_OFFSET0;
328	int k;
329	u16 reg;
330
331	/* Paranoia.. */
332	if ( (offset > HERMES_BAP_OFFSET_MAX) \|\| (offset % 2) )
333	return -EINVAL;
334
335	k = HERMES_BAP_BUSY_TIMEOUT;
336	reg = hermes_read_reg(hw, oreg);
337	while ((reg & HERMES_OFFSET_BUSY) && k) {
338	k--;
339	udelay(1);
340	reg = hermes_read_reg(hw, oreg);
341	}
342
1da177e4 LT	343	if (reg & HERMES_OFFSET_BUSY)
	344	return -ETIMEDOUT;
	345
	346	/* Now we actually set up the transfer */
	347	hermes_write_reg(hw, sreg, id);
	348	hermes_write_reg(hw, oreg, offset);
	349
	350	/* Wait for the BAP to be ready */
	351	k = HERMES_BAP_BUSY_TIMEOUT;
	352	reg = hermes_read_reg(hw, oreg);
	353	while ( (reg & (HERMES_OFFSET_BUSY \| HERMES_OFFSET_ERR)) && k) {
	354	k--;
	355	udelay(1);
	356	reg = hermes_read_reg(hw, oreg);
	357	}
	358
	359	if (reg != offset) {
	360	printk(KERN_ERR "hermes @ %p: BAP%d offset %s: "
	361	"reg=0x%x id=0x%x offset=0x%x\n", hw->iobase, bap,
	362	(reg & HERMES_OFFSET_BUSY) ? "timeout" : "error",
	363	reg, id, offset);
	364
	365	if (reg & HERMES_OFFSET_BUSY) {
	366	return -ETIMEDOUT;
	367	}
	368
	369	return -EIO; /* error or wrong offset */
	370	}
	371
	372	return 0;
	373	}
	374
	375	/* Read a block of data from the chip's buffer, via the
	376	* BAP. Synchronization/serialization is the caller's problem. len
	377	* must be even.
	378	*
	379	* Returns: < 0 on internal failure (errno), 0 on success, > 0 on error from firmware
	380	*/
c5b42f34	381	int hermes_bap_pread(hermes_t hw, int bap, void buf, int len,
1da177e4 LT	382	u16 id, u16 offset)
	383	{
	384	int dreg = bap ? HERMES_DATA1 : HERMES_DATA0;
	385	int err = 0;
	386
	387	if ( (len < 0) \|\| (len % 2) )
	388	return -EINVAL;
	389
	390	err = hermes_bap_seek(hw, bap, id, offset);
	391	if (err)
	392	goto out;
	393
	394	/* Actually do the transfer */
	395	hermes_read_words(hw, dreg, buf, len/2);
	396
	397	out:
	398	return err;
	399	}
	400
	401	/* Write a block of data to the chip's buffer, via the
6b616262	402	* BAP. Synchronization/serialization is the caller's problem.
1da177e4 LT	403	*
	404	* Returns: < 0 on internal failure (errno), 0 on success, > 0 on error from firmware
	405	*/
c5b42f34	406	int hermes_bap_pwrite(hermes_t hw, int bap, const void buf, int len,
1da177e4 LT	407	u16 id, u16 offset)
	408	{
	409	int dreg = bap ? HERMES_DATA1 : HERMES_DATA0;
	410	int err = 0;
	411
6b616262	412	if (len < 0)
1da177e4 LT	413	return -EINVAL;
	414
	415	err = hermes_bap_seek(hw, bap, id, offset);
	416	if (err)
	417	goto out;
	418
	419	/* Actually do the transfer */
6b616262	420	hermes_write_bytes(hw, dreg, buf, len);
1da177e4 LT	421
	422	out:
	423	return err;
	424	}
	425
	426	/* Read a Length-Type-Value record from the card.
	427	*
	428	* If length is NULL, we ignore the length read from the card, and
	429	* read the entire buffer regardless. This is useful because some of
	430	* the configuration records appear to have incorrect lengths in
	431	* practice.
	432	*
	433	* Callable from user or bh context. */
	434	int hermes_read_ltv(hermes_t *hw, int bap, u16 rid, unsigned bufsize,
	435	u16 length, void buf)
	436	{
	437	int err = 0;
	438	int dreg = bap ? HERMES_DATA1 : HERMES_DATA0;
	439	u16 rlength, rtype;
	440	unsigned nwords;
	441
	442	if ( (bufsize < 0) \|\| (bufsize % 2) )
	443	return -EINVAL;
	444
	445	err = hermes_docmd_wait(hw, HERMES_CMD_ACCESS, rid, NULL);
	446	if (err)
	447	return err;
	448
	449	err = hermes_bap_seek(hw, bap, rid, 0);
	450	if (err)
	451	return err;
	452
	453	rlength = hermes_read_reg(hw, dreg);
	454
	455	if (! rlength)
	456	return -ENODATA;
	457
	458	rtype = hermes_read_reg(hw, dreg);
	459
	460	if (length)
	461	*length = rlength;
	462
	463	if (rtype != rid)
	464	printk(KERN_WARNING "hermes @ %p: %s(): "
	465	"rid (0x%04x) does not match type (0x%04x)\n",
	466	hw->iobase, __FUNCTION__, rid, rtype);
	467	if (HERMES_RECLEN_TO_BYTES(rlength) > bufsize)
	468	printk(KERN_WARNING "hermes @ %p: "
	469	"Truncating LTV record from %d to %d bytes. "
	470	"(rid=0x%04x, len=0x%04x)\n", hw->iobase,
	471	HERMES_RECLEN_TO_BYTES(rlength), bufsize, rid, rlength);
	472
	473	nwords = min((unsigned)rlength - 1, bufsize / 2);
	474	hermes_read_words(hw, dreg, buf, nwords);
	475
	476	return 0;
	477	}
	478
	479	int hermes_write_ltv(hermes_t *hw, int bap, u16 rid,
	480	u16 length, const void *value)
	481	{
	482	int dreg = bap ? HERMES_DATA1 : HERMES_DATA0;
	483	int err = 0;
	484	unsigned count;
485
486	if (length == 0)
487	return -EINVAL;
488
489	err = hermes_bap_seek(hw, bap, rid, 0);
490	if (err)
491	return err;
492
493	hermes_write_reg(hw, dreg, length);
494	hermes_write_reg(hw, dreg, rid);
495
496	count = length - 1;
497
6b616262	498	hermes_write_bytes(hw, dreg, value, count << 1);
1da177e4 LT	499
	500	err = hermes_docmd_wait(hw, HERMES_CMD_ACCESS \| HERMES_CMD_WRITE,
	501	rid, NULL);
	502
	503	return err;
	504	}
	505
	506	EXPORT_SYMBOL(hermes_struct_init);
	507	EXPORT_SYMBOL(hermes_init);
	508	EXPORT_SYMBOL(hermes_docmd_wait);
	509	EXPORT_SYMBOL(hermes_allocate);
	510
	511	EXPORT_SYMBOL(hermes_bap_pread);
	512	EXPORT_SYMBOL(hermes_bap_pwrite);
	513	EXPORT_SYMBOL(hermes_read_ltv);
	514	EXPORT_SYMBOL(hermes_write_ltv);
	515
	516	static int __init init_hermes(void)
	517	{
	518	return 0;
	519	}
	520
	521	static void __exit exit_hermes(void)
	522	{
	523	}
	524
	525	module_init(init_hermes);
	526	module_exit(exit_hermes);