sfc: Don't use enums as a bitmask.

[zen-stable.git] / drivers / net / wireless / iwlegacy / iwl-eeprom.c

/******************************************************************************
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
 * USA
 *
 * The full GNU General Public License is included in this distribution
 * in the file called LICENSE.GPL.
 *
 * Contact Information:
 *  Intel Linux Wireless <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  * Neither the name Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *****************************************************************************/


#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>

#include <net/mac80211.h>

#include "iwl-commands.h"
#include "iwl-dev.h"
#include "iwl-core.h"
#include "iwl-debug.h"
#include "iwl-eeprom.h"
#include "iwl-io.h"

/************************** EEPROM BANDS ****************************
 *
 * The iwlegacy_eeprom_band definitions below provide the mapping from the
 * EEPROM contents to the specific channel number supported for each
 * band.
 *
 * For example, iwl_priv->eeprom.band_3_channels[4] from the band_3
 * definition below maps to physical channel 42 in the 5.2GHz spectrum.
 * The specific geography and calibration information for that channel
 * is contained in the eeprom map itself.
 *
 * During init, we copy the eeprom information and channel map
 * information into priv->channel_info_24/52 and priv->channel_map_24/52
 *
 * channel_map_24/52 provides the index in the channel_info array for a
 * given channel.  We have to have two separate maps as there is channel
 * overlap with the 2.4GHz and 5.2GHz spectrum as seen in band_1 and
 * band_2
 *
 * A value of 0xff stored in the channel_map indicates that the channel
 * is not supported by the hardware at all.
 *
 * A value of 0xfe in the channel_map indicates that the channel is not
 * valid for Tx with the current hardware.  This means that
 * while the system can tune and receive on a given channel, it may not
 * be able to associate or transmit any frames on that
 * channel.  There is no corresponding channel information for that
 * entry.
 *
 *********************************************************************/

/* 2.4 GHz */
const u8 iwlegacy_eeprom_band_1[14] = {
        1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
};

/* 5.2 GHz bands */
static const u8 iwlegacy_eeprom_band_2[] = {    /* 4915-5080MHz */
        183, 184, 185, 187, 188, 189, 192, 196, 7, 8, 11, 12, 16
};

static const u8 iwlegacy_eeprom_band_3[] = {    /* 5170-5320MHz */
        34, 36, 38, 40, 42, 44, 46, 48, 52, 56, 60, 64
};

static const u8 iwlegacy_eeprom_band_4[] = {    /* 5500-5700MHz */
        100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140
};

static const u8 iwlegacy_eeprom_band_5[] = {    /* 5725-5825MHz */
        145, 149, 153, 157, 161, 165
};

static const u8 iwlegacy_eeprom_band_6[] = {       /* 2.4 ht40 channel */
        1, 2, 3, 4, 5, 6, 7
};

static const u8 iwlegacy_eeprom_band_7[] = {       /* 5.2 ht40 channel */
        36, 44, 52, 60, 100, 108, 116, 124, 132, 149, 157
};

/******************************************************************************
 *
 * EEPROM related functions
 *
******************************************************************************/

static int iwl_legacy_eeprom_verify_signature(struct iwl_priv *priv)
{
        u32 gp = iwl_read32(priv, CSR_EEPROM_GP) & CSR_EEPROM_GP_VALID_MSK;
        int ret = 0;

        IWL_DEBUG_EEPROM(priv, "EEPROM signature=0x%08x\n", gp);
        switch (gp) {
        case CSR_EEPROM_GP_GOOD_SIG_EEP_LESS_THAN_4K:
        case CSR_EEPROM_GP_GOOD_SIG_EEP_MORE_THAN_4K:
                break;
        default:
                IWL_ERR(priv, "bad EEPROM signature,"
                        "EEPROM_GP=0x%08x\n", gp);
                ret = -ENOENT;
                break;
        }
        return ret;
}

const u8
*iwl_legacy_eeprom_query_addr(const struct iwl_priv *priv, size_t offset)
{
        BUG_ON(offset >= priv->cfg->base_params->eeprom_size);
        return &priv->eeprom[offset];
}
EXPORT_SYMBOL(iwl_legacy_eeprom_query_addr);

u16 iwl_legacy_eeprom_query16(const struct iwl_priv *priv, size_t offset)
{
        if (!priv->eeprom)
                return 0;
        return (u16)priv->eeprom[offset] | ((u16)priv->eeprom[offset + 1] << 8);
}
EXPORT_SYMBOL(iwl_legacy_eeprom_query16);

/**
 * iwl_legacy_eeprom_init - read EEPROM contents
 *
 * Load the EEPROM contents from adapter into priv->eeprom
 *
 * NOTE:  This routine uses the non-debug IO access functions.
 */
int iwl_legacy_eeprom_init(struct iwl_priv *priv)
{
        __le16 *e;
        u32 gp = iwl_read32(priv, CSR_EEPROM_GP);
        int sz;
        int ret;
        u16 addr;

        /* allocate eeprom */
        sz = priv->cfg->base_params->eeprom_size;
        IWL_DEBUG_EEPROM(priv, "NVM size = %d\n", sz);
        priv->eeprom = kzalloc(sz, GFP_KERNEL);
        if (!priv->eeprom) {
                ret = -ENOMEM;
                goto alloc_err;
        }
        e = (__le16 *)priv->eeprom;

        priv->cfg->ops->lib->apm_ops.init(priv);

        ret = iwl_legacy_eeprom_verify_signature(priv);
        if (ret < 0) {
                IWL_ERR(priv, "EEPROM not found, EEPROM_GP=0x%08x\n", gp);
                ret = -ENOENT;
                goto err;
        }

        /* Make sure driver (instead of uCode) is allowed to read EEPROM */
        ret = priv->cfg->ops->lib->eeprom_ops.acquire_semaphore(priv);
        if (ret < 0) {
                IWL_ERR(priv, "Failed to acquire EEPROM semaphore.\n");
                ret = -ENOENT;
                goto err;
        }

        /* eeprom is an array of 16bit values */
        for (addr = 0; addr < sz; addr += sizeof(u16)) {
                u32 r;

                _iwl_legacy_write32(priv, CSR_EEPROM_REG,
                             CSR_EEPROM_REG_MSK_ADDR & (addr << 1));

                ret = iwl_poll_bit(priv, CSR_EEPROM_REG,
                                          CSR_EEPROM_REG_READ_VALID_MSK,
                                          CSR_EEPROM_REG_READ_VALID_MSK,
                                          IWL_EEPROM_ACCESS_TIMEOUT);
                if (ret < 0) {
                        IWL_ERR(priv, "Time out reading EEPROM[%d]\n",
                                                        addr);
                        goto done;
                }
                r = _iwl_legacy_read_direct32(priv, CSR_EEPROM_REG);
                e[addr / 2] = cpu_to_le16(r >> 16);
        }

        IWL_DEBUG_EEPROM(priv, "NVM Type: %s, version: 0x%x\n",
                       "EEPROM",
                       iwl_legacy_eeprom_query16(priv, EEPROM_VERSION));

        ret = 0;
done:
        priv->cfg->ops->lib->eeprom_ops.release_semaphore(priv);

err:
        if (ret)
                iwl_legacy_eeprom_free(priv);
        /* Reset chip to save power until we load uCode during "up". */
        iwl_legacy_apm_stop(priv);
alloc_err:
        return ret;
}
EXPORT_SYMBOL(iwl_legacy_eeprom_init);

void iwl_legacy_eeprom_free(struct iwl_priv *priv)
{
        kfree(priv->eeprom);
        priv->eeprom = NULL;
}
EXPORT_SYMBOL(iwl_legacy_eeprom_free);

static void iwl_legacy_init_band_reference(const struct iwl_priv *priv,
                        int eep_band, int *eeprom_ch_count,
                        const struct iwl_eeprom_channel **eeprom_ch_info,
                        const u8 **eeprom_ch_index)
{
        u32 offset = priv->cfg->ops->lib->
                        eeprom_ops.regulatory_bands[eep_band - 1];
        switch (eep_band) {
        case 1:         /* 2.4GHz band */
                *eeprom_ch_count = ARRAY_SIZE(iwlegacy_eeprom_band_1);
                *eeprom_ch_info = (struct iwl_eeprom_channel *)
                                iwl_legacy_eeprom_query_addr(priv, offset);
                *eeprom_ch_index = iwlegacy_eeprom_band_1;
                break;
        case 2:         /* 4.9GHz band */
                *eeprom_ch_count = ARRAY_SIZE(iwlegacy_eeprom_band_2);
                *eeprom_ch_info = (struct iwl_eeprom_channel *)
                                iwl_legacy_eeprom_query_addr(priv, offset);
                *eeprom_ch_index = iwlegacy_eeprom_band_2;
                break;
        case 3:         /* 5.2GHz band */
                *eeprom_ch_count = ARRAY_SIZE(iwlegacy_eeprom_band_3);
                *eeprom_ch_info = (struct iwl_eeprom_channel *)
                                iwl_legacy_eeprom_query_addr(priv, offset);
                *eeprom_ch_index = iwlegacy_eeprom_band_3;
                break;
        case 4:         /* 5.5GHz band */
                *eeprom_ch_count = ARRAY_SIZE(iwlegacy_eeprom_band_4);
                *eeprom_ch_info = (struct iwl_eeprom_channel *)
                                iwl_legacy_eeprom_query_addr(priv, offset);
                *eeprom_ch_index = iwlegacy_eeprom_band_4;
                break;
        case 5:         /* 5.7GHz band */
                *eeprom_ch_count = ARRAY_SIZE(iwlegacy_eeprom_band_5);
                *eeprom_ch_info = (struct iwl_eeprom_channel *)
                                iwl_legacy_eeprom_query_addr(priv, offset);
                *eeprom_ch_index = iwlegacy_eeprom_band_5;
                break;
        case 6:         /* 2.4GHz ht40 channels */
                *eeprom_ch_count = ARRAY_SIZE(iwlegacy_eeprom_band_6);
                *eeprom_ch_info = (struct iwl_eeprom_channel *)
                                iwl_legacy_eeprom_query_addr(priv, offset);
                *eeprom_ch_index = iwlegacy_eeprom_band_6;
                break;
        case 7:         /* 5 GHz ht40 channels */
                *eeprom_ch_count = ARRAY_SIZE(iwlegacy_eeprom_band_7);
                *eeprom_ch_info = (struct iwl_eeprom_channel *)
                                iwl_legacy_eeprom_query_addr(priv, offset);
                *eeprom_ch_index = iwlegacy_eeprom_band_7;
                break;
        default:
                BUG();
                return;
        }
}

#define CHECK_AND_PRINT(x) ((eeprom_ch->flags & EEPROM_CHANNEL_##x) \
                            ? # x " " : "")
/**
 * iwl_legacy_mod_ht40_chan_info - Copy ht40 channel info into driver's priv.
 *
 * Does not set up a command, or touch hardware.
 */
static int iwl_legacy_mod_ht40_chan_info(struct iwl_priv *priv,
                              enum ieee80211_band band, u16 channel,
                              const struct iwl_eeprom_channel *eeprom_ch,
                              u8 clear_ht40_extension_channel)
{
        struct iwl_channel_info *ch_info;

        ch_info = (struct iwl_channel_info *)
                        iwl_legacy_get_channel_info(priv, band, channel);

        if (!iwl_legacy_is_channel_valid(ch_info))
                return -1;

        IWL_DEBUG_EEPROM(priv, "HT40 Ch. %d [%sGHz] %s%s%s%s%s(0x%02x %ddBm):"
                        " Ad-Hoc %ssupported\n",
                        ch_info->channel,
                        iwl_legacy_is_channel_a_band(ch_info) ?
                        "5.2" : "2.4",
                        CHECK_AND_PRINT(IBSS),
                        CHECK_AND_PRINT(ACTIVE),
                        CHECK_AND_PRINT(RADAR),
                        CHECK_AND_PRINT(WIDE),
                        CHECK_AND_PRINT(DFS),
                        eeprom_ch->flags,
                        eeprom_ch->max_power_avg,
                        ((eeprom_ch->flags & EEPROM_CHANNEL_IBSS)
                         && !(eeprom_ch->flags & EEPROM_CHANNEL_RADAR)) ?
                        "" : "not ");

        ch_info->ht40_eeprom = *eeprom_ch;
        ch_info->ht40_max_power_avg = eeprom_ch->max_power_avg;
        ch_info->ht40_flags = eeprom_ch->flags;
        if (eeprom_ch->flags & EEPROM_CHANNEL_VALID)
                ch_info->ht40_extension_channel &=
                                        ~clear_ht40_extension_channel;

        return 0;
}

#define CHECK_AND_PRINT_I(x) ((eeprom_ch_info[ch].flags & EEPROM_CHANNEL_##x) \
                            ? # x " " : "")

/**
 * iwl_legacy_init_channel_map - Set up driver's info for all possible channels
 */
int iwl_legacy_init_channel_map(struct iwl_priv *priv)
{
        int eeprom_ch_count = 0;
        const u8 *eeprom_ch_index = NULL;
        const struct iwl_eeprom_channel *eeprom_ch_info = NULL;
        int band, ch;
        struct iwl_channel_info *ch_info;

        if (priv->channel_count) {
                IWL_DEBUG_EEPROM(priv, "Channel map already initialized.\n");
                return 0;
        }

        IWL_DEBUG_EEPROM(priv, "Initializing regulatory info from EEPROM\n");

        priv->channel_count =
            ARRAY_SIZE(iwlegacy_eeprom_band_1) +
            ARRAY_SIZE(iwlegacy_eeprom_band_2) +
            ARRAY_SIZE(iwlegacy_eeprom_band_3) +
            ARRAY_SIZE(iwlegacy_eeprom_band_4) +
            ARRAY_SIZE(iwlegacy_eeprom_band_5);

        IWL_DEBUG_EEPROM(priv, "Parsing data for %d channels.\n",
                        priv->channel_count);

        priv->channel_info = kzalloc(sizeof(struct iwl_channel_info) *
                                     priv->channel_count, GFP_KERNEL);
        if (!priv->channel_info) {
                IWL_ERR(priv, "Could not allocate channel_info\n");
                priv->channel_count = 0;
                return -ENOMEM;
        }

        ch_info = priv->channel_info;

        /* Loop through the 5 EEPROM bands adding them in order to the
         * channel map we maintain (that contains additional information than
         * what just in the EEPROM) */
        for (band = 1; band <= 5; band++) {

                iwl_legacy_init_band_reference(priv, band, &eeprom_ch_count,
                                        &eeprom_ch_info, &eeprom_ch_index);

                /* Loop through each band adding each of the channels */
                for (ch = 0; ch < eeprom_ch_count; ch++) {
                        ch_info->channel = eeprom_ch_index[ch];
                        ch_info->band = (band == 1) ? IEEE80211_BAND_2GHZ :
                            IEEE80211_BAND_5GHZ;

                        /* permanently store EEPROM's channel regulatory flags
                         *   and max power in channel info database. */
                        ch_info->eeprom = eeprom_ch_info[ch];

                        /* Copy the run-time flags so they are there even on
                         * invalid channels */
                        ch_info->flags = eeprom_ch_info[ch].flags;
                        /* First write that ht40 is not enabled, and then enable
                         * one by one */
                        ch_info->ht40_extension_channel =
                                        IEEE80211_CHAN_NO_HT40;

                        if (!(iwl_legacy_is_channel_valid(ch_info))) {
                                IWL_DEBUG_EEPROM(priv,
                                               "Ch. %d Flags %x [%sGHz] - "
                                               "No traffic\n",
                                               ch_info->channel,
                                               ch_info->flags,
                                               iwl_legacy_is_channel_a_band(ch_info) ?
                                               "5.2" : "2.4");
                                ch_info++;
                                continue;
                        }

                        /* Initialize regulatory-based run-time data */
                        ch_info->max_power_avg = ch_info->curr_txpow =
                            eeprom_ch_info[ch].max_power_avg;
                        ch_info->scan_power = eeprom_ch_info[ch].max_power_avg;
                        ch_info->min_power = 0;

                        IWL_DEBUG_EEPROM(priv, "Ch. %d [%sGHz] "
                                       "%s%s%s%s%s%s(0x%02x %ddBm):"
                                       " Ad-Hoc %ssupported\n",
                                       ch_info->channel,
                                       iwl_legacy_is_channel_a_band(ch_info) ?
                                       "5.2" : "2.4",
                                       CHECK_AND_PRINT_I(VALID),
                                       CHECK_AND_PRINT_I(IBSS),
                                       CHECK_AND_PRINT_I(ACTIVE),
                                       CHECK_AND_PRINT_I(RADAR),
                                       CHECK_AND_PRINT_I(WIDE),
                                       CHECK_AND_PRINT_I(DFS),
                                       eeprom_ch_info[ch].flags,
                                       eeprom_ch_info[ch].max_power_avg,
                                       ((eeprom_ch_info[ch].
                                         flags & EEPROM_CHANNEL_IBSS)
                                        && !(eeprom_ch_info[ch].
                                             flags & EEPROM_CHANNEL_RADAR))
                                       ? "" : "not ");

                        ch_info++;
                }
        }

        /* Check if we do have HT40 channels */
        if (priv->cfg->ops->lib->eeprom_ops.regulatory_bands[5] ==
            EEPROM_REGULATORY_BAND_NO_HT40 &&
            priv->cfg->ops->lib->eeprom_ops.regulatory_bands[6] ==
            EEPROM_REGULATORY_BAND_NO_HT40)
                return 0;

        /* Two additional EEPROM bands for 2.4 and 5 GHz HT40 channels */
        for (band = 6; band <= 7; band++) {
                enum ieee80211_band ieeeband;

                iwl_legacy_init_band_reference(priv, band, &eeprom_ch_count,
                                        &eeprom_ch_info, &eeprom_ch_index);

                /* EEPROM band 6 is 2.4, band 7 is 5 GHz */
                ieeeband =
                        (band == 6) ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;

                /* Loop through each band adding each of the channels */
                for (ch = 0; ch < eeprom_ch_count; ch++) {
                        /* Set up driver's info for lower half */
                        iwl_legacy_mod_ht40_chan_info(priv, ieeeband,
                                                eeprom_ch_index[ch],
                                                &eeprom_ch_info[ch],
                                                IEEE80211_CHAN_NO_HT40PLUS);

                        /* Set up driver's info for upper half */
                        iwl_legacy_mod_ht40_chan_info(priv, ieeeband,
                                                eeprom_ch_index[ch] + 4,
                                                &eeprom_ch_info[ch],
                                                IEEE80211_CHAN_NO_HT40MINUS);
                }
        }

        return 0;
}
EXPORT_SYMBOL(iwl_legacy_init_channel_map);

/*
 * iwl_legacy_free_channel_map - undo allocations in iwl_legacy_init_channel_map
 */
void iwl_legacy_free_channel_map(struct iwl_priv *priv)
{
        kfree(priv->channel_info);
        priv->channel_count = 0;
}
EXPORT_SYMBOL(iwl_legacy_free_channel_map);

/**
 * iwl_legacy_get_channel_info - Find driver's private channel info
 *
 * Based on band and channel number.
 */
const struct
iwl_channel_info *iwl_legacy_get_channel_info(const struct iwl_priv *priv,
                                        enum ieee80211_band band, u16 channel)
{
        int i;

        switch (band) {
        case IEEE80211_BAND_5GHZ:
                for (i = 14; i < priv->channel_count; i++) {
                        if (priv->channel_info[i].channel == channel)
                                return &priv->channel_info[i];
                }
                break;
        case IEEE80211_BAND_2GHZ:
                if (channel >= 1 && channel <= 14)
                        return &priv->channel_info[channel - 1];
                break;
        default:
                BUG();
        }

        return NULL;
}
EXPORT_SYMBOL(iwl_legacy_get_channel_info);