hermes.c
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上传日期:2013-04-10
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- /* 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 <hermes@gibson.dropbear.id.au>
- * Copyright (C) 2001, David Gibson, IBM <hermes@gibson.dropbear.id.au>
- *
- * 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/types.h>
- #include <linux/threads.h>
- #include <linux/smp.h>
- #include <asm/io.h>
- #include <linux/ptrace.h>
- #include <linux/delay.h>
- #include <linux/init.h>
- #include <linux/kernel.h>
- #include <asm/errno.h>
- #include "hermes.h"
- static char version[] __initdata = "hermes.c: 5 Apr 2002 David Gibson <hermes@gibson.dropbear.id.au>";
- MODULE_DESCRIPTION("Low-level driver helper for Lucent Hermes chipset and Prism II HFA384x wireless MAC controller");
- MODULE_AUTHOR("David Gibson <hermes@gibson.dropbear.id.au>");
- #ifdef MODULE_LICENSE
- MODULE_LICENSE("Dual MPL/GPL");
- #endif
- /* 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
- */
- #undef HERMES_DEBUG
- #ifdef HERMES_DEBUG
- #include <stdarg.h>
- #define DMSG(stuff...) do {printk(KERN_DEBUG "hermes @ 0x%x: " , hw->iobase);
- printk(stuff);} while (0)
- #define DEBUG(lvl, stuff...) if ( (lvl) <= HERMES_DEBUG) DMSG(stuff)
- #else /* ! HERMES_DEBUG */
- #define DEBUG(lvl, stuff...) do { } while (0)
- #endif /* ! HERMES_DEBUG */
- #define IO_TYPE(hw) ((hw)->io_space ? "IO " : "MEM ")
- /*
- * 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);
- }
- DEBUG(3, "hermes_issue_cmd: did %d retries.n", CMD_BUSY_TIMEOUT-k);
- 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, ulong address,
- int io_space, int reg_spacing)
- {
- hw->iobase = address;
- hw->io_space = io_space;
- 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_reset(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);
- }
- DEBUG(0, "Reset completed in %d iterationsn", CMD_INIT_TIMEOUT - k);
- 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 @ %s0x%lx: "
- "Timeout waiting for card to reset (reg=0x%04x)!n",
- IO_TYPE(hw), 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, hermes_response_t *resp)
- {
- int err;
- int k;
- u16 reg;
- u16 status;
- err = hermes_issue_cmd(hw, cmd, parm0);
- if (err) {
- if (! hermes_present(hw)) {
- printk(KERN_WARNING "hermes @ %s0x%lx: "
- "Card removed while issuing command.n",
- IO_TYPE(hw), hw->iobase);
- err = -ENODEV;
- } else
- printk(KERN_ERR "hermes @ %s0x%lx: Error %d issuing command.n",
- IO_TYPE(hw), hw->iobase, err);
- 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 @ %s0x%lx: "
- "Card removed while waiting for command completion.n",
- IO_TYPE(hw), hw->iobase);
- err = -ENODEV;
- goto out;
- }
-
- if (! (reg & HERMES_EV_CMD)) {
- printk(KERN_ERR "hermes @ %s0x%lx: "
- "Timeout waiting for command completion.n",
- IO_TYPE(hw), hw->iobase);
- 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) {
- printk(KERN_WARNING "hermes @ %s0x%lx: "
- "Frame allocation command failed (0x%X).n",
- IO_TYPE(hw), hw->iobase, 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 @ %s0x%lx: "
- "Card removed waiting for frame allocation.n",
- IO_TYPE(hw), hw->iobase);
- return -ENODEV;
- }
-
- if (! (reg & HERMES_EV_ALLOC)) {
- printk(KERN_ERR "hermes @ %s0x%lx: "
- "Timeout waiting for frame allocationn",
- IO_TYPE(hw), 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 & HERMES_OFFSET_BUSY) {
- DEBUG(1,"hermes_bap_seek: timeoutn");
- return -ETIMEDOUT;
- }
- if (reg & HERMES_OFFSET_ERR) {
- DEBUG(1,"hermes_bap_seek: BAP errorn");
- return -EIO;
- }
- 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;
- }
- /* 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, int bufsize,
- u16 *length, void *buf)
- {
- int err = 0;
- int dreg = bap ? HERMES_DATA1 : HERMES_DATA0;
- u16 rlength, rtype;
- if ( (bufsize < 0) || (bufsize % 2) )
- return -EINVAL;
- err = hermes_docmd_wait(hw, HERMES_CMD_ACCESS, rid, NULL);
- if (err)
- goto out;
- err = hermes_bap_seek(hw, bap, rid, 0);
- if (err)
- goto out;
- rlength = hermes_read_reg(hw, dreg);
- rtype = hermes_read_reg(hw, dreg);
- if (length)
- *length = rlength;
- if (rtype != rid)
- printk(KERN_WARNING "hermes @ %s0x%lx: "
- "hermes_read_ltv(): rid (0x%04x) does not match type (0x%04x)n",
- IO_TYPE(hw), hw->iobase, rid, rtype);
- if (HERMES_RECLEN_TO_BYTES(rlength) > bufsize)
- printk(KERN_WARNING "hermes @ %s0x%lx: "
- "Truncating LTV record from %d to %d bytes. "
- "(rid=0x%04x, len=0x%04x)n",
- IO_TYPE(hw), hw->iobase,
- HERMES_RECLEN_TO_BYTES(rlength), bufsize, rid, rlength);
-
- /* FIXME: we should read the min of the requested length and
- the actual record length */
- hermes_read_words(hw, dreg, buf, bufsize / 2);
- out:
- return err;
- }
- 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;
- int count;
-
- DEBUG(3, "write_ltv(): bap=%d rid=0x%04x length=%d (value=0x%04x)n",
- bap, rid, length, * ((u16 *)value));
- err = hermes_bap_seek(hw, bap, rid, 0);
- if (err)
- goto out;
- 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);
- out:
- return err;
- }
- EXPORT_SYMBOL(hermes_struct_init);
- EXPORT_SYMBOL(hermes_reset);
- 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)
- {
- printk(KERN_DEBUG "%sn", version);
- return 0;
- }
- module_init(init_hermes);