// SPDX-License-Identifier: GPL-2.0-only
/*
 * Implementation of host-to-chip commands (aka request/confirmation) of WFxxx
 * Split Mac (WSM) API.
 *
 * Copyright (c) 2017-2020, Silicon Laboratories, Inc.
 * Copyright (c) 2010, ST-Ericsson
 */
#include <linux/etherdevice.h>

#include "hif_tx.h"
#include "wfx.h"
#include "bh.h"
#include "hwio.h"
#include "debug.h"
#include "sta.h"

void wfx_init_hif_cmd(struct wfx_hif_cmd *hif_cmd)
{
        init_completion(&hif_cmd->ready);
        init_completion(&hif_cmd->done);
        mutex_init(&hif_cmd->lock);
}

static void wfx_fill_header(struct hif_msg *hif, int if_id,
                            unsigned int cmd, size_t size)
{
        if (if_id == -1)
                if_id = 2;

        WARN(cmd > 0x3f, "invalid WSM command %#.2x", cmd);
        WARN(size > 0xFFF, "requested buffer is too large: %zu bytes", size);
        WARN(if_id > 0x3, "invalid interface ID %d", if_id);

        hif->len = cpu_to_le16(size + 4);
        hif->id = cmd;
        hif->interface = if_id;
}

static void *wfx_alloc_hif(size_t body_len, struct hif_msg **hif)
{
        *hif = kzalloc(sizeof(struct hif_msg) + body_len, GFP_KERNEL);
        if (*hif)
                return (*hif)->body;
        else
                return NULL;
}

int wfx_cmd_send(struct wfx_dev *wdev, struct hif_msg *request,
                 void *reply, size_t reply_len, bool no_reply)
{
        const char *mib_name = "";
        const char *mib_sep = "";
        int cmd = request->id;
        int vif = request->interface;
        int ret;

        // Do not wait for any reply if chip is frozen
        if (wdev->chip_frozen)
                return -ETIMEDOUT;

        mutex_lock(&wdev->hif_cmd.lock);
        WARN(wdev->hif_cmd.buf_send, "data locking error");

        // Note: call to complete() below has an implicit memory barrier that
        // hopefully protect buf_send
        wdev->hif_cmd.buf_send = request;
        wdev->hif_cmd.buf_recv = reply;
        wdev->hif_cmd.len_recv = reply_len;
        complete(&wdev->hif_cmd.ready);

        wfx_bh_request_tx(wdev);

        if (no_reply) {
                // Chip won't reply. Give enough time to the wq to send the
                // buffer.
                msleep(100);
                wdev->hif_cmd.buf_send = NULL;
                mutex_unlock(&wdev->hif_cmd.lock);
                return 0;
        }

        if (wdev->poll_irq)
                wfx_bh_poll_irq(wdev);

        ret = wait_for_completion_timeout(&wdev->hif_cmd.done, 1 * HZ);
        if (!ret) {
                dev_err(wdev->dev, "chip is abnormally long to answer\n");
                reinit_completion(&wdev->hif_cmd.ready);
                ret = wait_for_completion_timeout(&wdev->hif_cmd.done, 3 * HZ);
        }
        if (!ret) {
                dev_err(wdev->dev, "chip did not answer\n");
                wfx_pending_dump_old_frames(wdev, 3000);
                wdev->chip_frozen = true;
                reinit_completion(&wdev->hif_cmd.done);
                ret = -ETIMEDOUT;
        } else {
                ret = wdev->hif_cmd.ret;
        }

        wdev->hif_cmd.buf_send = NULL;
        mutex_unlock(&wdev->hif_cmd.lock);

        if (ret &&
            (cmd == HIF_REQ_ID_READ_MIB || cmd == HIF_REQ_ID_WRITE_MIB)) {
                mib_name = get_mib_name(((u16 *)request)[2]);
                mib_sep = "/";
        }
        if (ret < 0)
                dev_err(wdev->dev,
                        "WSM request %s%s%s (%#.2x) on vif %d returned error %d\n",
                        get_hif_name(cmd), mib_sep, mib_name, cmd, vif, ret);
        if (ret > 0)
                dev_warn(wdev->dev,
                         "WSM request %s%s%s (%#.2x) on vif %d returned status %d\n",
                         get_hif_name(cmd), mib_sep, mib_name, cmd, vif, ret);

        return ret;
}

// This function is special. After HIF_REQ_ID_SHUT_DOWN, chip won't reply to any
// request anymore. Obviously, only call this function during device unregister.
int hif_shutdown(struct wfx_dev *wdev)
{
        int ret;
        struct hif_msg *hif;

        wfx_alloc_hif(0, &hif);
        if (!hif)
                return -ENOMEM;
        wfx_fill_header(hif, -1, HIF_REQ_ID_SHUT_DOWN, 0);
        ret = wfx_cmd_send(wdev, hif, NULL, 0, true);
        if (wdev->pdata.gpio_wakeup)
                gpiod_set_value(wdev->pdata.gpio_wakeup, 0);
        else
                control_reg_write(wdev, 0);
        kfree(hif);
        return ret;
}

int hif_configuration(struct wfx_dev *wdev, const u8 *conf, size_t len)
{
        int ret;
        size_t buf_len = sizeof(struct hif_req_configuration) + len;
        struct hif_msg *hif;
        struct hif_req_configuration *body = wfx_alloc_hif(buf_len, &hif);

        if (!hif)
                return -ENOMEM;
        body->length = cpu_to_le16(len);
        memcpy(body->pds_data, conf, len);
        wfx_fill_header(hif, -1, HIF_REQ_ID_CONFIGURATION, buf_len);
        ret = wfx_cmd_send(wdev, hif, NULL, 0, false);
        kfree(hif);
        return ret;
}

int hif_reset(struct wfx_vif *wvif, bool reset_stat)
{
        int ret;
        struct hif_msg *hif;
        struct hif_req_reset *body = wfx_alloc_hif(sizeof(*body), &hif);

        if (!hif)
                return -ENOMEM;
        body->reset_stat = reset_stat;
        wfx_fill_header(hif, wvif->id, HIF_REQ_ID_RESET, sizeof(*body));
        ret = wfx_cmd_send(wvif->wdev, hif, NULL, 0, false);
        kfree(hif);
        return ret;
}

int hif_read_mib(struct wfx_dev *wdev, int vif_id, u16 mib_id,
                 void *val, size_t val_len)
{
        int ret;
        struct hif_msg *hif;
        int buf_len = sizeof(struct hif_cnf_read_mib) + val_len;
        struct hif_req_read_mib *body = wfx_alloc_hif(sizeof(*body), &hif);
        struct hif_cnf_read_mib *reply = kmalloc(buf_len, GFP_KERNEL);

        if (!body || !reply) {
                ret = -ENOMEM;
                goto out;
        }
        body->mib_id = cpu_to_le16(mib_id);
        wfx_fill_header(hif, vif_id, HIF_REQ_ID_READ_MIB, sizeof(*body));
        ret = wfx_cmd_send(wdev, hif, reply, buf_len, false);

        if (!ret && mib_id != le16_to_cpu(reply->mib_id)) {
                dev_warn(wdev->dev, "%s: confirmation mismatch request\n",
                         __func__);
                ret = -EIO;
        }
        if (ret == -ENOMEM)
                dev_err(wdev->dev, "buffer is too small to receive %s (%zu < %d)\n",
                        get_mib_name(mib_id), val_len,
                        le16_to_cpu(reply->length));
        if (!ret)
                memcpy(val, &reply->mib_data, le16_to_cpu(reply->length));
        else
                memset(val, 0xFF, val_len);
out:
        kfree(hif);
        kfree(reply);
        return ret;
}

int hif_write_mib(struct wfx_dev *wdev, int vif_id, u16 mib_id,
                  void *val, size_t val_len)
{
        int ret;
        struct hif_msg *hif;
        int buf_len = sizeof(struct hif_req_write_mib) + val_len;
        struct hif_req_write_mib *body = wfx_alloc_hif(buf_len, &hif);

        if (!hif)
                return -ENOMEM;
        body->mib_id = cpu_to_le16(mib_id);
        body->length = cpu_to_le16(val_len);
        memcpy(&body->mib_data, val, val_len);
        wfx_fill_header(hif, vif_id, HIF_REQ_ID_WRITE_MIB, buf_len);
        ret = wfx_cmd_send(wdev, hif, NULL, 0, false);
        kfree(hif);
        return ret;
}

int hif_scan(struct wfx_vif *wvif, struct cfg80211_scan_request *req,
             int chan_start_idx, int chan_num, int *timeout)
{
        int ret, i;
        struct hif_msg *hif;
        size_t buf_len =
                sizeof(struct hif_req_start_scan_alt) + chan_num * sizeof(u8);
        struct hif_req_start_scan_alt *body = wfx_alloc_hif(buf_len, &hif);
        int tmo_chan_fg, tmo_chan_bg, tmo;

        WARN(chan_num > HIF_API_MAX_NB_CHANNELS, "invalid params");
        WARN(req->n_ssids > HIF_API_MAX_NB_SSIDS, "invalid params");

        if (!hif)
                return -ENOMEM;
        for (i = 0; i < req->n_ssids; i++) {
                memcpy(body->ssid_def[i].ssid, req->ssids[i].ssid,
                       IEEE80211_MAX_SSID_LEN);
                body->ssid_def[i].ssid_length =
                        cpu_to_le32(req->ssids[i].ssid_len);
        }
        body->num_of_ssids = HIF_API_MAX_NB_SSIDS;
        body->maintain_current_bss = 1;
        body->disallow_ps = 1;
        body->tx_power_level =
                cpu_to_le32(req->channels[chan_start_idx]->max_power);
        body->num_of_channels = chan_num;
        for (i = 0; i < chan_num; i++)
                body->channel_list[i] =
                        req->channels[i + chan_start_idx]->hw_value;
        if (req->no_cck)
                body->max_transmit_rate = API_RATE_INDEX_G_6MBPS;
        else
                body->max_transmit_rate = API_RATE_INDEX_B_1MBPS;
        if (req->channels[chan_start_idx]->flags & IEEE80211_CHAN_NO_IR) {
                body->min_channel_time = cpu_to_le32(50);
                body->max_channel_time = cpu_to_le32(150);
        } else {
                body->min_channel_time = cpu_to_le32(10);
                body->max_channel_time = cpu_to_le32(50);
                body->num_of_probe_requests = 2;
                body->probe_delay = 100;
        }
        tmo_chan_bg = le32_to_cpu(body->max_channel_time) * USEC_PER_TU;
        tmo_chan_fg = 512 * USEC_PER_TU + body->probe_delay;
        tmo_chan_fg *= body->num_of_probe_requests;
        tmo = chan_num * max(tmo_chan_bg, tmo_chan_fg) + 512 * USEC_PER_TU;
        if (timeout)
                *timeout = usecs_to_jiffies(tmo);

        wfx_fill_header(hif, wvif->id, HIF_REQ_ID_START_SCAN, buf_len);
        ret = wfx_cmd_send(wvif->wdev, hif, NULL, 0, false);
        kfree(hif);
        return ret;
}

int hif_stop_scan(struct wfx_vif *wvif)
{
        int ret;
        struct hif_msg *hif;
        // body associated to HIF_REQ_ID_STOP_SCAN is empty
        wfx_alloc_hif(0, &hif);

        if (!hif)
                return -ENOMEM;
        wfx_fill_header(hif, wvif->id, HIF_REQ_ID_STOP_SCAN, 0);
        ret = wfx_cmd_send(wvif->wdev, hif, NULL, 0, false);
        kfree(hif);
        return ret;
}

int hif_join(struct wfx_vif *wvif, const struct ieee80211_bss_conf *conf,
             struct ieee80211_channel *channel, const u8 *ssid, int ssidlen)
{
        int ret;
        struct hif_msg *hif;
        struct hif_req_join *body = wfx_alloc_hif(sizeof(*body), &hif);

        WARN_ON(!conf->beacon_int);
        WARN_ON(!conf->basic_rates);
        WARN_ON(sizeof(body->ssid) < ssidlen);
        WARN(!conf->ibss_joined && !ssidlen, "joining an unknown BSS");
        if (WARN_ON(!channel))
                return -EINVAL;
        if (!hif)
                return -ENOMEM;
        body->infrastructure_bss_mode = !conf->ibss_joined;
        body->short_preamble = conf->use_short_preamble;
        if (channel->flags & IEEE80211_CHAN_NO_IR)
                body->probe_for_join = 0;
        else
                body->probe_for_join = 1;
        body->channel_number = channel->hw_value;
        body->beacon_interval = cpu_to_le32(conf->beacon_int);
        body->basic_rate_set =
                cpu_to_le32(wfx_rate_mask_to_hw(wvif->wdev, conf->basic_rates));
        memcpy(body->bssid, conf->bssid, sizeof(body->bssid));
        if (ssid) {
                body->ssid_length = cpu_to_le32(ssidlen);
                memcpy(body->ssid, ssid, ssidlen);
        }
        wfx_fill_header(hif, wvif->id, HIF_REQ_ID_JOIN, sizeof(*body));
        ret = wfx_cmd_send(wvif->wdev, hif, NULL, 0, false);
        kfree(hif);
        return ret;
}

int hif_set_bss_params(struct wfx_vif *wvif, int aid, int beacon_lost_count)
{
        int ret;
        struct hif_msg *hif;
        struct hif_req_set_bss_params *body =
                wfx_alloc_hif(sizeof(*body), &hif);

        if (!hif)
                return -ENOMEM;
        body->aid = cpu_to_le16(aid);
        body->beacon_lost_count = beacon_lost_count;
        wfx_fill_header(hif, wvif->id, HIF_REQ_ID_SET_BSS_PARAMS,
                        sizeof(*body));
        ret = wfx_cmd_send(wvif->wdev, hif, NULL, 0, false);
        kfree(hif);
        return ret;
}

int hif_add_key(struct wfx_dev *wdev, const struct hif_req_add_key *arg)
{
        int ret;
        struct hif_msg *hif;
        // FIXME: only send necessary bits
        struct hif_req_add_key *body = wfx_alloc_hif(sizeof(*body), &hif);

        if (!hif)
                return -ENOMEM;
        // FIXME: swap bytes as necessary in body
        memcpy(body, arg, sizeof(*body));
        if (wfx_api_older_than(wdev, 1, 5))
                // Legacy firmwares expect that add_key to be sent on right
                // interface.
                wfx_fill_header(hif, arg->int_id, HIF_REQ_ID_ADD_KEY,
                                sizeof(*body));
        else
                wfx_fill_header(hif, -1, HIF_REQ_ID_ADD_KEY, sizeof(*body));
        ret = wfx_cmd_send(wdev, hif, NULL, 0, false);
        kfree(hif);
        return ret;
}

int hif_remove_key(struct wfx_dev *wdev, int idx)
{
        int ret;
        struct hif_msg *hif;
        struct hif_req_remove_key *body = wfx_alloc_hif(sizeof(*body), &hif);

        if (!hif)
                return -ENOMEM;
        body->entry_index = idx;
        wfx_fill_header(hif, -1, HIF_REQ_ID_REMOVE_KEY, sizeof(*body));
        ret = wfx_cmd_send(wdev, hif, NULL, 0, false);
        kfree(hif);
        return ret;
}

int hif_set_edca_queue_params(struct wfx_vif *wvif, u16 queue,
                              const struct ieee80211_tx_queue_params *arg)
{
        int ret;
        struct hif_msg *hif;
        struct hif_req_edca_queue_params *body = wfx_alloc_hif(sizeof(*body),
                                                               &hif);

        if (!body)
                return -ENOMEM;

        WARN_ON(arg->aifs > 255);
        if (!hif)
                return -ENOMEM;
        body->aifsn = arg->aifs;
        body->cw_min = cpu_to_le16(arg->cw_min);
        body->cw_max = cpu_to_le16(arg->cw_max);
        body->tx_op_limit = cpu_to_le16(arg->txop * USEC_PER_TXOP);
        body->queue_id = 3 - queue;
        // API 2.0 has changed queue IDs values
        if (wfx_api_older_than(wvif->wdev, 2, 0) && queue == IEEE80211_AC_BE)
                body->queue_id = HIF_QUEUE_ID_BACKGROUND;
        if (wfx_api_older_than(wvif->wdev, 2, 0) && queue == IEEE80211_AC_BK)
                body->queue_id = HIF_QUEUE_ID_BESTEFFORT;
        wfx_fill_header(hif, wvif->id, HIF_REQ_ID_EDCA_QUEUE_PARAMS,
                        sizeof(*body));
        ret = wfx_cmd_send(wvif->wdev, hif, NULL, 0, false);
        kfree(hif);
        return ret;
}

int hif_set_pm(struct wfx_vif *wvif, bool ps, int dynamic_ps_timeout)
{
        int ret;
        struct hif_msg *hif;
        struct hif_req_set_pm_mode *body = wfx_alloc_hif(sizeof(*body), &hif);

        if (!body)
                return -ENOMEM;

        if (!hif)
                return -ENOMEM;
        if (ps) {
                body->enter_psm = 1;
                // Firmware does not support more than 128ms
                body->fast_psm_idle_period = min(dynamic_ps_timeout * 2, 255);
                if (body->fast_psm_idle_period)
                        body->fast_psm = 1;
        }
        wfx_fill_header(hif, wvif->id, HIF_REQ_ID_SET_PM_MODE, sizeof(*body));
        ret = wfx_cmd_send(wvif->wdev, hif, NULL, 0, false);
        kfree(hif);
        return ret;
}

int hif_start(struct wfx_vif *wvif, const struct ieee80211_bss_conf *conf,
              const struct ieee80211_channel *channel)
{
        int ret;
        struct hif_msg *hif;
        struct hif_req_start *body = wfx_alloc_hif(sizeof(*body), &hif);

        WARN_ON(!conf->beacon_int);
        if (!hif)
                return -ENOMEM;
        body->dtim_period = conf->dtim_period;
        body->short_preamble = conf->use_short_preamble;
        body->channel_number = channel->hw_value;
        body->beacon_interval = cpu_to_le32(conf->beacon_int);
        body->basic_rate_set =
                cpu_to_le32(wfx_rate_mask_to_hw(wvif->wdev, conf->basic_rates));
        body->ssid_length = conf->ssid_len;
        memcpy(body->ssid, conf->ssid, conf->ssid_len);
        wfx_fill_header(hif, wvif->id, HIF_REQ_ID_START, sizeof(*body));
        ret = wfx_cmd_send(wvif->wdev, hif, NULL, 0, false);
        kfree(hif);
        return ret;
}

int hif_beacon_transmit(struct wfx_vif *wvif, bool enable)
{
        int ret;
        struct hif_msg *hif;
        struct hif_req_beacon_transmit *body = wfx_alloc_hif(sizeof(*body),
                                                             &hif);

        if (!hif)
                return -ENOMEM;
        body->enable_beaconing = enable ? 1 : 0;
        wfx_fill_header(hif, wvif->id, HIF_REQ_ID_BEACON_TRANSMIT,
                        sizeof(*body));
        ret = wfx_cmd_send(wvif->wdev, hif, NULL, 0, false);
        kfree(hif);
        return ret;
}

int hif_map_link(struct wfx_vif *wvif, bool unmap, u8 *mac_addr, int sta_id, bool mfp)
{
        int ret;
        struct hif_msg *hif;
        struct hif_req_map_link *body = wfx_alloc_hif(sizeof(*body), &hif);

        if (!hif)
                return -ENOMEM;
        if (mac_addr)
                ether_addr_copy(body->mac_addr, mac_addr);
        body->mfpc = mfp ? 1 : 0;
        body->unmap = unmap ? 1 : 0;
        body->peer_sta_id = sta_id;
        wfx_fill_header(hif, wvif->id, HIF_REQ_ID_MAP_LINK, sizeof(*body));
        ret = wfx_cmd_send(wvif->wdev, hif, NULL, 0, false);
        kfree(hif);
        return ret;
}

int hif_update_ie_beacon(struct wfx_vif *wvif, const u8 *ies, size_t ies_len)
{
        int ret;
        struct hif_msg *hif;
        int buf_len = sizeof(struct hif_req_update_ie) + ies_len;
        struct hif_req_update_ie *body = wfx_alloc_hif(buf_len, &hif);

        if (!hif)
                return -ENOMEM;
        body->beacon = 1;
        body->num_ies = cpu_to_le16(1);
        memcpy(body->ie, ies, ies_len);
        wfx_fill_header(hif, wvif->id, HIF_REQ_ID_UPDATE_IE, buf_len);
        ret = wfx_cmd_send(wvif->wdev, hif, NULL, 0, false);
        kfree(hif);
        return ret;
}