/*
 * Atheros CARL9170 driver
 *
 * Basic HW register/memory/command access functions
 *
 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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; see the file COPYING.  If not, see
 * http://www.gnu.org/licenses/.
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *    Copyright (c) 2007-2008 Atheros Communications, Inc.
 *
 *    Permission to use, copy, modify, and/or distribute this software for any
 *    purpose with or without fee is hereby granted, provided that the above
 *    copyright notice and this permission notice appear in all copies.
 *
 *    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 *    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 *    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 *    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 *    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 *    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 *    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <asm/div64.h>
#include "carl9170.h"
#include "cmd.h"

int carl9170_write_reg(struct ar9170 *ar, const u32 reg, const u32 val)
{
        const __le32 buf[2] = {
                cpu_to_le32(reg),
                cpu_to_le32(val),
        };
        int err;

        err = carl9170_exec_cmd(ar, CARL9170_CMD_WREG, sizeof(buf),
                                (u8 *) buf, 0, NULL);
        if (err) {
                if (net_ratelimit()) {
                        wiphy_err(ar->hw->wiphy, "writing reg %#x "
                                "(val %#x) failed (%d)\n", reg, val, err);
                }
        }
        return err;
}

int carl9170_read_mreg(struct ar9170 *ar, const int nregs,
                       const u32 *regs, u32 *out)
{
        int i, err;
        __le32 *offs, *res;

        /* abuse "out" for the register offsets, must be same length */
        offs = (__le32 *)out;
        for (i = 0; i < nregs; i++)
                offs[i] = cpu_to_le32(regs[i]);

        /* also use the same buffer for the input */
        res = (__le32 *)out;

        err = carl9170_exec_cmd(ar, CARL9170_CMD_RREG,
                                4 * nregs, (u8 *)offs,
                                4 * nregs, (u8 *)res);
        if (err) {
                if (net_ratelimit()) {
                        wiphy_err(ar->hw->wiphy, "reading regs failed (%d)\n",
                                  err);
                }
                return err;
        }

        /* convert result to cpu endian */
        for (i = 0; i < nregs; i++)
                out[i] = le32_to_cpu(res[i]);

        return 0;
}

int carl9170_read_reg(struct ar9170 *ar, u32 reg, u32 *val)
{
        return carl9170_read_mreg(ar, 1, &reg, val);
}

int carl9170_echo_test(struct ar9170 *ar, const u32 v)
{
        u32 echores;
        int err;

        err = carl9170_exec_cmd(ar, CARL9170_CMD_ECHO,
                                4, (u8 *)&v,
                                4, (u8 *)&echores);
        if (err)
                return err;

        if (v != echores) {
                wiphy_info(ar->hw->wiphy, "wrong echo %x != %x", v, echores);
                return -EINVAL;
        }

        return 0;
}

struct carl9170_cmd *carl9170_cmd_buf(struct ar9170 *ar,
        const enum carl9170_cmd_oids cmd, const unsigned int len)
{
        struct carl9170_cmd *tmp;

        tmp = kzalloc(sizeof(struct carl9170_cmd_head) + len, GFP_ATOMIC);
        if (tmp) {
                tmp->hdr.cmd = cmd;
                tmp->hdr.len = len;
        }

        return tmp;
}

int carl9170_reboot(struct ar9170 *ar)
{
        struct carl9170_cmd *cmd;
        int err;

        cmd = carl9170_cmd_buf(ar, CARL9170_CMD_REBOOT_ASYNC, 0);
        if (!cmd)
                return -ENOMEM;

        err = __carl9170_exec_cmd(ar, cmd, true);
        return err;
}

int carl9170_mac_reset(struct ar9170 *ar)
{
        return carl9170_exec_cmd(ar, CARL9170_CMD_SWRST,
                                 0, NULL, 0, NULL);
}

int carl9170_bcn_ctrl(struct ar9170 *ar, const unsigned int vif_id,
                       const u32 mode, const u32 addr, const u32 len)
{
        struct carl9170_cmd *cmd;

        cmd = carl9170_cmd_buf(ar, CARL9170_CMD_BCN_CTRL_ASYNC,
                               sizeof(struct carl9170_bcn_ctrl_cmd));
        if (!cmd)
                return -ENOMEM;

        cmd->bcn_ctrl.vif_id = cpu_to_le32(vif_id);
        cmd->bcn_ctrl.mode = cpu_to_le32(mode);
        cmd->bcn_ctrl.bcn_addr = cpu_to_le32(addr);
        cmd->bcn_ctrl.bcn_len = cpu_to_le32(len);

        return __carl9170_exec_cmd(ar, cmd, true);
}

int carl9170_collect_tally(struct ar9170 *ar)
{
        struct carl9170_tally_rsp tally;
        struct survey_info *info;
        unsigned int tick;
        int err;

        err = carl9170_exec_cmd(ar, CARL9170_CMD_TALLY, 0, NULL,
                                sizeof(tally), (u8 *)&tally);
        if (err)
                return err;

        tick = le32_to_cpu(tally.tick);
        if (tick) {
                ar->tally.active += le32_to_cpu(tally.active) / tick;
                ar->tally.cca += le32_to_cpu(tally.cca) / tick;
                ar->tally.tx_time += le32_to_cpu(tally.tx_time) / tick;
                ar->tally.rx_total += le32_to_cpu(tally.rx_total);
                ar->tally.rx_overrun += le32_to_cpu(tally.rx_overrun);

                if (ar->channel) {
                        info = &ar->survey[ar->channel->hw_value];
                        info->time = ar->tally.active;
                        info->time_busy = ar->tally.cca;
                        info->time_tx = ar->tally.tx_time;
                        do_div(info->time, 1000);
                        do_div(info->time_busy, 1000);
                        do_div(info->time_tx, 1000);
                }
        }
        return 0;
}

int carl9170_powersave(struct ar9170 *ar, const bool ps)
{
        struct carl9170_cmd *cmd;
        u32 state;

        cmd = carl9170_cmd_buf(ar, CARL9170_CMD_PSM_ASYNC,
                               sizeof(struct carl9170_psm));
        if (!cmd)
                return -ENOMEM;

        if (ps) {
                /* Sleep until next TBTT */
                state = CARL9170_PSM_SLEEP | 1;
        } else {
                /* wake up immediately */
                state = 1;
        }

        cmd->psm.state = cpu_to_le32(state);
        return __carl9170_exec_cmd(ar, cmd, true);
}