/*
 * Atheros CARL9170 driver
 *
 * Basic HW register/memory/command access functions
 *
 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
 * Copyright 2010, Christian Lamparter <chunkeey@googlemail.com>
 *
 * 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.
 */
#ifndef __CMD_H
#define __CMD_H

#include "carl9170.h"

/* basic HW access */
int carl9170_write_reg(struct ar9170 *ar, const u32 reg, const u32 val);
int carl9170_read_reg(struct ar9170 *ar, const u32 reg, u32 *val);
int carl9170_read_mreg(struct ar9170 *ar, const int nregs,
                       const u32 *regs, u32 *out);
int carl9170_echo_test(struct ar9170 *ar, u32 v);
int carl9170_reboot(struct ar9170 *ar);
int carl9170_mac_reset(struct ar9170 *ar);
int carl9170_powersave(struct ar9170 *ar, const bool power_on);
int carl9170_bcn_ctrl(struct ar9170 *ar, const unsigned int vif_id,
                       const u32 mode, const u32 addr, const u32 len);

static inline int carl9170_flush_cab(struct ar9170 *ar,
                                     const unsigned int vif_id)
{
        return carl9170_bcn_ctrl(ar, vif_id, CARL9170_BCN_CTRL_DRAIN, 0, 0);
}

static inline int carl9170_rx_filter(struct ar9170 *ar,
                                     const unsigned int _rx_filter)
{
        __le32 rx_filter = cpu_to_le32(_rx_filter);

        return carl9170_exec_cmd(ar, CARL9170_CMD_RX_FILTER,
                                sizeof(rx_filter), (u8 *)&rx_filter,
                                0, NULL);
}

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

/*
 * Macros to facilitate writing multiple registers in a single
 * write-combining USB command. Note that when the first group
 * fails the whole thing will fail without any others attempted,
 * but you won't know which write in the group failed.
 */
#define carl9170_regwrite_begin(ar)                                     \
do {                                                                    \
        int __nreg = 0, __err = 0;                                      \
        struct ar9170 *__ar = ar;

#define carl9170_regwrite(r, v) do {                                    \
        __ar->cmd_buf[2 * __nreg + 1] = cpu_to_le32(r);                 \
        __ar->cmd_buf[2 * __nreg + 2] = cpu_to_le32(v);                 \
        __nreg++;                                                       \
        if ((__nreg >= PAYLOAD_MAX/2)) {                                \
                if (IS_ACCEPTING_CMD(__ar))                             \
                        __err = carl9170_exec_cmd(__ar,                 \
                                CARL9170_CMD_WREG, 8 * __nreg,          \
                                (u8 *) &__ar->cmd_buf[1], 0, NULL);     \
                else                                                    \
                        goto __regwrite_out;                            \
                                                                        \
                __nreg = 0;                                             \
                if (__err)                                              \
                        goto __regwrite_out;                            \
        }                                                               \
} while (0)

#define carl9170_regwrite_finish()                                      \
__regwrite_out :                                                        \
        if (__err == 0 && __nreg) {                                     \
                if (IS_ACCEPTING_CMD(__ar))                             \
                        __err = carl9170_exec_cmd(__ar,                 \
                                CARL9170_CMD_WREG, 8 * __nreg,          \
                                (u8 *) &__ar->cmd_buf[1], 0, NULL);     \
                __nreg = 0;                                             \
        }

#define carl9170_regwrite_result()                                      \
        __err;                                                          \
} while (0);


#define carl9170_async_regwrite_get_buf()                               \
do {                                                                    \
        __nreg = 0;                                                     \
        __cmd = carl9170_cmd_buf(__carl, CARL9170_CMD_WREG_ASYNC,       \
                                 CARL9170_MAX_CMD_PAYLOAD_LEN);         \
        if (__cmd == NULL) {                                            \
                __err = -ENOMEM;                                        \
                goto __async_regwrite_out;                              \
        }                                                               \
} while (0);

#define carl9170_async_regwrite_begin(carl)                             \
do {                                                                    \
        struct ar9170 *__carl = carl;                                   \
        struct carl9170_cmd *__cmd;                                     \
        unsigned int __nreg;                                            \
        int  __err = 0;                                                 \
        carl9170_async_regwrite_get_buf();                              \

#define carl9170_async_regwrite_flush()                                 \
do {                                                                    \
        if (__cmd == NULL || __nreg == 0)                               \
                break;                                                  \
                                                                        \
        if (IS_ACCEPTING_CMD(__carl) && __nreg) {                       \
                __cmd->hdr.len = 8 * __nreg;                            \
                __err = __carl9170_exec_cmd(__carl, __cmd, true);       \
                __cmd = NULL;                                           \
                break;                                                  \
        }                                                               \
        goto __async_regwrite_out;                                      \
} while (0)

#define carl9170_async_regwrite(r, v) do {                              \
        if (__cmd == NULL)                                              \
                carl9170_async_regwrite_get_buf();                      \
        __cmd->wreg.regs[__nreg].addr = cpu_to_le32(r);                 \
        __cmd->wreg.regs[__nreg].val = cpu_to_le32(v);                  \
        __nreg++;                                                       \
        if ((__nreg >= PAYLOAD_MAX / 2))                                \
                carl9170_async_regwrite_flush();                        \
} while (0)

#define carl9170_async_regwrite_finish() do {                           \
__async_regwrite_out :                                                  \
        if (__cmd != NULL && __err == 0)                                \
                carl9170_async_regwrite_flush();                        \
        kfree(__cmd);                                                   \
} while (0)                                                             \

#define carl9170_async_regwrite_result()                                \
        __err;                                                          \
} while (0);

#endif /* __CMD_H */