ath9k_htc: Support for AR9271 chipset.

Features:

 * Station mode
 * IBSS mode
 * Monitor mode
 * Legacy support
 * HT support
 * TX/RX 11n Aggregation
 * HW encryption
 * LED
 * Suspend/Resume

For more information: http://wireless.kernel.org/en/users/Drivers/ath9k_htc

Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: Senthil Balasubramanian <senthilkumar@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 463 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/htc_hst.c b/drivers/net/wireless/ath/ath9k/htc_hst.c
new file mode 100644
index 000000000000..9a48999d0979
--- /dev/null
+++ b/drivers/net/wireless/ath/ath9k/htc_hst.c
@@ -0,0 +1,463 @@
+/*
+ * Copyright (c) 2010 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 "htc.h"
+
+static int htc_issue_send(struct htc_target *target, struct sk_buff* skb,
+                          u16 len, u8 flags, u8 epid,
+                          struct ath9k_htc_tx_ctl *tx_ctl)
+{
+        struct htc_frame_hdr *hdr;
+        struct htc_endpoint *endpoint = &target->endpoint[epid];
+        int status;
+
+        hdr = (struct htc_frame_hdr *)
+                skb_push(skb, sizeof(struct htc_frame_hdr));
+        hdr->endpoint_id = epid;
+        hdr->flags = flags;
+        hdr->payload_len = cpu_to_be16(len);
+
+        status = target->hif->send(target->hif_dev, endpoint->ul_pipeid, skb,
+                                   tx_ctl);
+        return status;
+}
+
+static struct htc_endpoint *get_next_avail_ep(struct htc_endpoint *endpoint)
+{
+        enum htc_endpoint_id avail_epid;
+
+        for (avail_epid = ENDPOINT_MAX; avail_epid > ENDPOINT0; avail_epid--)
+                if (endpoint[avail_epid].service_id == 0)
+                        return &endpoint[avail_epid];
+        return NULL;
+}
+
+static u8 service_to_ulpipe(u16 service_id)
+{
+        switch (service_id) {
+        case WMI_CONTROL_SVC:
+                return 4;
+        case WMI_BEACON_SVC:
+        case WMI_CAB_SVC:
+        case WMI_UAPSD_SVC:
+        case WMI_MGMT_SVC:
+        case WMI_DATA_VO_SVC:
+        case WMI_DATA_VI_SVC:
+        case WMI_DATA_BE_SVC:
+        case WMI_DATA_BK_SVC:
+                return 1;
+        default:
+                return 0;
+        }
+}
+
+static u8 service_to_dlpipe(u16 service_id)
+{
+        switch (service_id) {
+        case WMI_CONTROL_SVC:
+                return 3;
+        case WMI_BEACON_SVC:
+        case WMI_CAB_SVC:
+        case WMI_UAPSD_SVC:
+        case WMI_MGMT_SVC:
+        case WMI_DATA_VO_SVC:
+        case WMI_DATA_VI_SVC:
+        case WMI_DATA_BE_SVC:
+        case WMI_DATA_BK_SVC:
+                return 2;
+        default:
+                return 0;
+        }
+}
+
+static void htc_process_target_rdy(struct htc_target *target,
+                                   void *buf)
+{
+        struct htc_endpoint *endpoint;
+        struct htc_ready_msg *htc_ready_msg = (struct htc_ready_msg *) buf;
+
+        target->credits = be16_to_cpu(htc_ready_msg->credits);
+        target->credit_size = be16_to_cpu(htc_ready_msg->credit_size);
+
+        endpoint = &target->endpoint[ENDPOINT0];
+        endpoint->service_id = HTC_CTRL_RSVD_SVC;
+        endpoint->max_msglen = HTC_MAX_CONTROL_MESSAGE_LENGTH;
+        complete(&target->target_wait);
+}
+
+static void htc_process_conn_rsp(struct htc_target *target,
+                                 struct htc_frame_hdr *htc_hdr)
+{
+        struct htc_conn_svc_rspmsg *svc_rspmsg;
+        struct htc_endpoint *endpoint, *tmp_endpoint = NULL;
+        u16 service_id;
+        u16 max_msglen;
+        enum htc_endpoint_id epid, tepid;
+
+        svc_rspmsg = (struct htc_conn_svc_rspmsg *)
+                ((void *) htc_hdr + sizeof(struct htc_frame_hdr));
+
+        if (svc_rspmsg->status == HTC_SERVICE_SUCCESS) {
+                epid = svc_rspmsg->endpoint_id;
+                service_id = be16_to_cpu(svc_rspmsg->service_id);
+                max_msglen = be16_to_cpu(svc_rspmsg->max_msg_len);
+                endpoint = &target->endpoint[epid];
+
+                for (tepid = ENDPOINT_MAX; tepid > ENDPOINT0; tepid--) {
+                        tmp_endpoint = &target->endpoint[tepid];
+                        if (tmp_endpoint->service_id == service_id) {
+                                tmp_endpoint->service_id = 0;
+                                break;
+                        }
+                }
+
+                if (!tmp_endpoint)
+                        return;
+
+                endpoint->service_id = service_id;
+                endpoint->max_txqdepth = tmp_endpoint->max_txqdepth;
+                endpoint->ep_callbacks = tmp_endpoint->ep_callbacks;
+                endpoint->ul_pipeid = tmp_endpoint->ul_pipeid;
+                endpoint->dl_pipeid = tmp_endpoint->dl_pipeid;
+                endpoint->max_msglen = max_msglen;
+                target->conn_rsp_epid = epid;
+                complete(&target->cmd_wait);
+        } else {
+                target->conn_rsp_epid = ENDPOINT_UNUSED;
+        }
+}
+
+static int htc_config_pipe_credits(struct htc_target *target)
+{
+        struct sk_buff *skb;
+        struct htc_config_pipe_msg *cp_msg;
+        int ret, time_left;
+
+        skb = dev_alloc_skb(50 + sizeof(struct htc_frame_hdr));
+        if (!skb) {
+                dev_err(target->dev, "failed to allocate send buffer\n");
+                return -ENOMEM;
+        }
+        skb_reserve(skb, sizeof(struct htc_frame_hdr));
+
+        cp_msg = (struct htc_config_pipe_msg *)
+                skb_put(skb, sizeof(struct htc_config_pipe_msg));
+
+        cp_msg->message_id = cpu_to_be16(HTC_MSG_CONFIG_PIPE_ID);
+        cp_msg->pipe_id = USB_WLAN_TX_PIPE;
+        cp_msg->credits = 28;
+
+        target->htc_flags |= HTC_OP_CONFIG_PIPE_CREDITS;
+
+        ret = htc_issue_send(target, skb, skb->len, 0, ENDPOINT0, NULL);
+        if (ret)
+                goto err;
+
+        time_left = wait_for_completion_timeout(&target->cmd_wait, HZ);
+        if (!time_left) {
+                dev_err(target->dev, "HTC credit config timeout\n");
+                return -ETIMEDOUT;
+        }
+
+        return 0;
+err:
+        dev_kfree_skb(skb);
+        return -EINVAL;
+}
+
+static int htc_setup_complete(struct htc_target *target)
+{
+        struct sk_buff *skb;
+        struct htc_comp_msg *comp_msg;
+        int ret = 0, time_left;
+
+        skb = dev_alloc_skb(50 + sizeof(struct htc_frame_hdr));
+        if (!skb) {
+                dev_err(target->dev, "failed to allocate send buffer\n");
+                return -ENOMEM;
+        }
+        skb_reserve(skb, sizeof(struct htc_frame_hdr));
+
+        comp_msg = (struct htc_comp_msg *)
+                skb_put(skb, sizeof(struct htc_comp_msg));
+        comp_msg->msg_id = cpu_to_be16(HTC_MSG_SETUP_COMPLETE_ID);
+
+        target->htc_flags |= HTC_OP_START_WAIT;
+
+        ret = htc_issue_send(target, skb, skb->len, 0, ENDPOINT0, NULL);
+        if (ret)
+                goto err;
+
+        time_left = wait_for_completion_timeout(&target->cmd_wait, HZ);
+        if (!time_left) {
+                dev_err(target->dev, "HTC start timeout\n");
+                return -ETIMEDOUT;
+        }
+
+        return 0;
+
+err:
+        dev_kfree_skb(skb);
+        return -EINVAL;
+}
+
+/* HTC APIs */
+
+int htc_init(struct htc_target *target)
+{
+        int ret;
+
+        ret = htc_config_pipe_credits(target);
+        if (ret)
+                return ret;
+
+        return htc_setup_complete(target);
+}
+
+int htc_connect_service(struct htc_target *target,
+                     struct htc_service_connreq *service_connreq,
+                     enum htc_endpoint_id *conn_rsp_epid)
+{
+        struct sk_buff *skb;
+        struct htc_endpoint *endpoint;
+        struct htc_conn_svc_msg *conn_msg;
+        int ret, time_left;
+
+        /* Find an available endpoint */
+        endpoint = get_next_avail_ep(target->endpoint);
+        if (!endpoint) {
+                dev_err(target->dev, "Endpoint is not available for"
+                        "service %d\n", service_connreq->service_id);
+                return -EINVAL;
+        }
+
+        endpoint->service_id = service_connreq->service_id;
+        endpoint->max_txqdepth = service_connreq->max_send_qdepth;
+        endpoint->ul_pipeid = service_to_ulpipe(service_connreq->service_id);
+        endpoint->dl_pipeid = service_to_dlpipe(service_connreq->service_id);
+        endpoint->ep_callbacks = service_connreq->ep_callbacks;
+
+        skb = dev_alloc_skb(sizeof(struct htc_conn_svc_msg) +
+                            sizeof(struct htc_frame_hdr));
+        if (!skb) {
+                dev_err(target->dev, "Failed to allocate buf to send"
+                        "service connect req\n");
+                return -ENOMEM;
+        }
+
+        skb_reserve(skb, sizeof(struct htc_frame_hdr));
+
+        conn_msg = (struct htc_conn_svc_msg *)
+                        skb_put(skb, sizeof(struct htc_conn_svc_msg));
+        conn_msg->service_id = cpu_to_be16(service_connreq->service_id);
+        conn_msg->msg_id = cpu_to_be16(HTC_MSG_CONNECT_SERVICE_ID);
+        conn_msg->con_flags = cpu_to_be16(service_connreq->con_flags);
+        conn_msg->dl_pipeid = endpoint->dl_pipeid;
+        conn_msg->ul_pipeid = endpoint->ul_pipeid;
+
+        ret = htc_issue_send(target, skb, skb->len, 0, ENDPOINT0, NULL);
+        if (ret)
+                goto err;
+
+        time_left = wait_for_completion_timeout(&target->cmd_wait, HZ);
+        if (!time_left) {
+                dev_err(target->dev, "Service connection timeout for: %d\n",
+                        service_connreq->service_id);
+                return -ETIMEDOUT;
+        }
+
+        *conn_rsp_epid = target->conn_rsp_epid;
+        return 0;
+err:
+        dev_kfree_skb(skb);
+        return ret;
+}
+
+int htc_send(struct htc_target *target, struct sk_buff *skb,
+             enum htc_endpoint_id epid, struct ath9k_htc_tx_ctl *tx_ctl)
+{
+        return htc_issue_send(target, skb, skb->len, 0, epid, tx_ctl);
+}
+
+void htc_stop(struct htc_target *target)
+{
+        enum htc_endpoint_id epid;
+        struct htc_endpoint *endpoint;
+
+        for (epid = ENDPOINT0; epid <= ENDPOINT_MAX; epid++) {
+                endpoint = &target->endpoint[epid];
+                if (endpoint->service_id != 0)
+                        target->hif->stop(target->hif_dev, endpoint->ul_pipeid);
+        }
+}
+
+void htc_start(struct htc_target *target)
+{
+        enum htc_endpoint_id epid;
+        struct htc_endpoint *endpoint;
+
+        for (epid = ENDPOINT0; epid <= ENDPOINT_MAX; epid++) {
+                endpoint = &target->endpoint[epid];
+                if (endpoint->service_id != 0)
+                        target->hif->start(target->hif_dev,
+                                           endpoint->ul_pipeid);
+        }
+}
+
+void ath9k_htc_txcompletion_cb(struct htc_target *htc_handle,
+                               struct sk_buff *skb, bool txok)
+{
+        struct htc_endpoint *endpoint;
+        struct htc_frame_hdr *htc_hdr;
+
+        if (htc_handle->htc_flags & HTC_OP_CONFIG_PIPE_CREDITS) {
+                complete(&htc_handle->cmd_wait);
+                htc_handle->htc_flags &= ~HTC_OP_CONFIG_PIPE_CREDITS;
+        }
+
+        if (htc_handle->htc_flags & HTC_OP_START_WAIT) {
+                complete(&htc_handle->cmd_wait);
+                htc_handle->htc_flags &= ~HTC_OP_START_WAIT;
+        }
+
+        if (skb) {
+                htc_hdr = (struct htc_frame_hdr *) skb->data;
+                endpoint = &htc_handle->endpoint[htc_hdr->endpoint_id];
+                skb_pull(skb, sizeof(struct htc_frame_hdr));
+
+                if (endpoint->ep_callbacks.tx) {
+                        endpoint->ep_callbacks.tx(htc_handle->drv_priv, skb,
+                                                  htc_hdr->endpoint_id, txok);
+                }
+        }
+}
+
+/*
+ * HTC Messages are handled directly here and the obtained SKB
+ * is freed.
+ *
+ * Sevice messages (Data, WMI) passed to the corresponding
+ * endpoint RX handlers, which have to free the SKB.
+ */
+void ath9k_htc_rx_msg(struct htc_target *htc_handle,
+                      struct sk_buff *skb, u32 len, u8 pipe_id)
+{
+        struct htc_frame_hdr *htc_hdr;
+        enum htc_endpoint_id epid;
+        struct htc_endpoint *endpoint;
+        u16 *msg_id;
+
+        if (!htc_handle || !skb)
+                return;
+
+        htc_hdr = (struct htc_frame_hdr *) skb->data;
+        epid = htc_hdr->endpoint_id;
+
+        if (epid >= ENDPOINT_MAX) {
+                dev_kfree_skb_any(skb);
+                return;
+        }
+
+        if (epid == ENDPOINT0) {
+
+                /* Handle trailer */
+                if (htc_hdr->flags & HTC_FLAGS_RECV_TRAILER) {
+                        if (be32_to_cpu(*(u32 *) skb->data) == 0x00C60000)
+                                /* Move past the Watchdog pattern */
+                                htc_hdr = (struct htc_frame_hdr *) skb->data + 4;
+                }
+
+                /* Get the message ID */
+                msg_id = (u16 *) ((void *) htc_hdr +
+                                           sizeof(struct htc_frame_hdr));
+
+                /* Now process HTC messages */
+                switch (be16_to_cpu(*msg_id)) {
+                case HTC_MSG_READY_ID:
+                        htc_process_target_rdy(htc_handle, htc_hdr);
+                        break;
+                case HTC_MSG_CONNECT_SERVICE_RESPONSE_ID:
+                        htc_process_conn_rsp(htc_handle, htc_hdr);
+                        break;
+                default:
+                        break;
+                }
+
+                dev_kfree_skb_any(skb);
+
+        } else {
+                if (htc_hdr->flags & HTC_FLAGS_RECV_TRAILER)
+                        skb_trim(skb, len - htc_hdr->control[0]);
+
+                skb_pull(skb, sizeof(struct htc_frame_hdr));
+
+                endpoint = &htc_handle->endpoint[epid];
+                if (endpoint->ep_callbacks.rx)
+                        endpoint->ep_callbacks.rx(endpoint->ep_callbacks.priv,
+                                                  skb, epid);
+        }
+}
+
+struct htc_target *ath9k_htc_hw_alloc(void *hif_handle)
+{
+        struct htc_target *target;
+
+        target = kzalloc(sizeof(struct htc_target), GFP_KERNEL);
+        if (!target)
+                printk(KERN_ERR "Unable to allocate memory for"
+                        "target device\n");
+
+        return target;
+}
+
+void ath9k_htc_hw_free(struct htc_target *htc)
+{
+        kfree(htc);
+}
+
+int ath9k_htc_hw_init(struct ath9k_htc_hif *hif, struct htc_target *target,
+                      void *hif_handle, struct device *dev, u16 devid,
+                      enum ath9k_hif_transports transport)
+{
+        struct htc_endpoint *endpoint;
+        int err = 0;
+
+        init_completion(&target->target_wait);
+        init_completion(&target->cmd_wait);
+
+        target->hif = hif;
+        target->hif_dev = hif_handle;
+        target->dev = dev;
+
+        /* Assign control endpoint pipe IDs */
+        endpoint = &target->endpoint[ENDPOINT0];
+        endpoint->ul_pipeid = hif->control_ul_pipe;
+        endpoint->dl_pipeid = hif->control_dl_pipe;
+
+        err = ath9k_htc_probe_device(target, dev, devid);
+        if (err) {
+                printk(KERN_ERR "Failed to initialize the device\n");
+                return -ENODEV;
+        }
+
+        return 0;
+}
+
+void ath9k_htc_hw_deinit(struct htc_target *target, bool hot_unplug)
+{
+        if (target)
+                ath9k_htc_disconnect_device(target, hot_unplug);
+}