1 files changed, 544 insertions, 0 deletions

diff --git a/drivers/net/wireless/orinoco/hermes.c b/drivers/net/wireless/orinoco/hermes.c
new file mode 100644
index 000000000000..bfa375369df3
--- /dev/null
+++ b/drivers/net/wireless/orinoco/hermes.c
@@ -0,0 +1,544 @@
+/* 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,
+                            u16 param1, u16 param2)
+{
+        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, param2);
+        hermes_write_regn(hw, PARAM1, param1);
+        hermes_write_regn(hw, PARAM0, param0);
+        hermes_write_regn(hw, CMD, cmd);
+        
+        return 0;
+}
+
+/*
+ * Function definitions
+ */
+
+/* For doing cmds that wipe the magic constant in SWSUPPORT0 */
+int hermes_doicmd_wait(hermes_t *hw, u16 cmd,
+                       u16 parm0, u16 parm1, u16 parm2,
+                       struct hermes_response *resp)
+{
+        int err = 0;
+        int k;
+        u16 status, reg;
+
+        err = hermes_issue_cmd(hw, cmd, parm0, parm1, parm2);
+        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);
+        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;
+}
+EXPORT_SYMBOL(hermes_doicmd_wait);
+
+void hermes_struct_init(hermes_t *hw, void __iomem *address, int reg_spacing)
+{
+        hw->iobase = address;
+        hw->reg_spacing = reg_spacing;
+        hw->inten = 0x0;
+}
+EXPORT_SYMBOL(hermes_struct_init);
+
+int hermes_init(hermes_t *hw)
+{
+        u16 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_doicmd_wait(hw, HERMES_CMD_INIT, 0, 0, 0, NULL);
+
+        return err;
+}
+EXPORT_SYMBOL(hermes_init);
+
+/* 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, 0, 0);
+        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;
+}
+EXPORT_SYMBOL(hermes_docmd_wait);
+
+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;
+}
+EXPORT_SYMBOL(hermes_allocate);
+
+/* 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;
+}
+EXPORT_SYMBOL(hermes_bap_pread);
+
+/* 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;
+}
+EXPORT_SYMBOL(hermes_bap_pwrite);
+
+/* 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, __func__, 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;
+}
+EXPORT_SYMBOL(hermes_read_ltv);
+
+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_write_ltv);
+
+static int __init init_hermes(void)
+{
+        return 0;
+}
+
+static void __exit exit_hermes(void)
+{
+}
+
+module_init(init_hermes);
+module_exit(exit_hermes);