diff options
Diffstat (limited to 'drivers/net/wireless/hermes.c')
| -rw-r--r-- | drivers/net/wireless/hermes.c | 554 |
1 files changed, 554 insertions, 0 deletions
diff --git a/drivers/net/wireless/hermes.c b/drivers/net/wireless/hermes.c new file mode 100644 index 0000000..21c3d0d --- /dev/null +++ b/drivers/net/wireless/hermes.c @@ -0,0 +1,554 @@ +/* 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/types.h> +#include <linux/threads.h> +#include <linux/smp.h> +#include <asm/io.h> +#include <linux/delay.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/net.h> +#include <asm/errno.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, unsigned 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, unsigned 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, 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_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); |
