| /* |
| * This file is part of the UWB stack for linux. |
| * |
| * Copyright (c) 2020 Qorvo US, Inc. |
| * |
| * This software is provided under the GNU General Public License, version 2 |
| * (GPLv2), as well as under a Qorvo commercial license. |
| * |
| * You may choose to use this software under the terms of the GPLv2 License, |
| * version 2 ("GPLv2"), as published by the Free Software Foundation. |
| * You should have received a copy of the GPLv2 along with this program. If |
| * not, see <http://www.gnu.org/licenses/>. |
| * |
| * This program is distributed under the GPLv2 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 GPLv2 for more |
| * details. |
| * |
| * If you cannot meet the requirements of the GPLv2, you may not use this |
| * software for any purpose without first obtaining a commercial license from |
| * Qorvo. |
| * Please contact Qorvo to inquire about licensing terms. |
| * |
| * 802.15.4 mac common part sublayer, FProc states: Multi. |
| * |
| */ |
| |
| #include <linux/errno.h> |
| |
| #include "mcps802154_i.h" |
| #include "llhw-ops.h" |
| |
| static int mcps802154_fproc_multi_handle_frame(struct mcps802154_local *local, |
| struct mcps802154_access *access, |
| size_t frame_idx); |
| |
| /** |
| * mcps802154_fproc_multi_next() - Continue with the next frame, or next |
| * access. |
| * @local: MCPS private data. |
| * @access: Current access to handle. |
| * @frame_idx: Frame index in current access, must be valid, will be |
| * incremented. |
| */ |
| static void mcps802154_fproc_multi_next(struct mcps802154_local *local, |
| struct mcps802154_access *access, |
| size_t frame_idx) |
| { |
| int r; |
| |
| frame_idx++; |
| if (frame_idx < access->n_frames) { |
| /* Next frame. */ |
| r = mcps802154_fproc_multi_handle_frame(local, access, |
| frame_idx); |
| if (r) { |
| mcps802154_fproc_access_done(local); |
| if (r == -ETIME) |
| mcps802154_fproc_access_now(local); |
| else |
| mcps802154_fproc_broken_handle(local); |
| } |
| } else { |
| /* Next access. */ |
| if (access->duration_dtu) { |
| u32 next_access_dtu = |
| access->timestamp_dtu + access->duration_dtu; |
| mcps802154_fproc_access_done(local); |
| mcps802154_fproc_access(local, next_access_dtu); |
| } else { |
| mcps802154_fproc_access_done(local); |
| mcps802154_fproc_access_now(local); |
| } |
| } |
| } |
| |
| static void mcps802154_fproc_multi_rx_rx_frame(struct mcps802154_local *local) |
| { |
| struct mcps802154_access *access = local->fproc.access; |
| size_t frame_idx = local->fproc.frame_idx; |
| struct mcps802154_access_frame *frame = &access->frames[frame_idx]; |
| int r; |
| |
| /* Read frame. */ |
| struct sk_buff *skb = NULL; |
| struct mcps802154_rx_frame_info info = { |
| .flags = frame->rx.frame_info_flags_request, |
| }; |
| r = llhw_rx_get_frame(local, &skb, &info); |
| if (!r) |
| access->ops->rx_frame(access, frame_idx, skb, &info); |
| |
| if (r && r != -EBUSY) { |
| mcps802154_fproc_access_done(local); |
| mcps802154_fproc_broken_handle(local); |
| } else { |
| /* Next. */ |
| mcps802154_fproc_multi_next(local, access, frame_idx); |
| } |
| } |
| |
| static void mcps802154_fproc_multi_rx_rx_timeout(struct mcps802154_local *local) |
| { |
| struct mcps802154_access *access = local->fproc.access; |
| size_t frame_idx = local->fproc.frame_idx; |
| |
| /* TODO: better way to signal timeout. */ |
| access->ops->rx_frame(access, frame_idx, NULL, NULL); |
| |
| /* Next. */ |
| mcps802154_fproc_multi_next(local, access, frame_idx); |
| } |
| |
| static void |
| mcps802154_fproc_multi_rx_rx_error(struct mcps802154_local *local, |
| enum mcps802154_rx_error_type error) |
| { |
| struct mcps802154_access *access = local->fproc.access; |
| size_t frame_idx = local->fproc.frame_idx; |
| |
| /* TODO: better way to signal error. */ |
| access->ops->rx_frame(access, frame_idx, NULL, NULL); |
| |
| /* Next. */ |
| mcps802154_fproc_multi_next(local, access, frame_idx); |
| } |
| |
| static void |
| mcps802154_fproc_multi_rx_schedule_change(struct mcps802154_local *local) |
| { |
| /* If the Rx is done without a timeout, disable RX and change the access. */ |
| struct mcps802154_access *access = local->fproc.access; |
| int frame_idx = local->fproc.frame_idx; |
| struct mcps802154_access_frame *frame = &access->frames[frame_idx]; |
| |
| if (frame->rx.info.timeout_dtu == -1) { |
| /* Disable RX. */ |
| int r = llhw_rx_disable(local); |
| |
| if (r == -EBUSY) |
| /* Wait for RX result. */ |
| return; |
| |
| access->ops->rx_frame(access, frame_idx, NULL, NULL); |
| if (r) { |
| mcps802154_fproc_access_done(local); |
| mcps802154_fproc_broken_handle(local); |
| } else { |
| /* Next. */ |
| mcps802154_fproc_multi_next(local, access, frame_idx); |
| } |
| } |
| } |
| |
| static const struct mcps802154_fproc_state mcps802154_fproc_multi_rx = { |
| .name = "multi_rx", |
| .rx_frame = mcps802154_fproc_multi_rx_rx_frame, |
| .rx_timeout = mcps802154_fproc_multi_rx_rx_timeout, |
| .rx_error = mcps802154_fproc_multi_rx_rx_error, |
| .schedule_change = mcps802154_fproc_multi_rx_schedule_change, |
| }; |
| |
| static void mcps802154_fproc_multi_tx_tx_done(struct mcps802154_local *local) |
| { |
| struct mcps802154_access *access = local->fproc.access; |
| size_t frame_idx = local->fproc.frame_idx; |
| |
| access->ops->tx_return(access, frame_idx, local->fproc.tx_skb, |
| MCPS802154_ACCESS_TX_RETURN_REASON_CONSUMED); |
| local->fproc.tx_skb = NULL; |
| |
| /* Next. */ |
| mcps802154_fproc_multi_next(local, access, frame_idx); |
| } |
| |
| static void |
| mcps802154_fproc_multi_tx_schedule_change(struct mcps802154_local *local) |
| { |
| /* Wait for end of current frame. */ |
| } |
| |
| static const struct mcps802154_fproc_state mcps802154_fproc_multi_tx = { |
| .name = "multi_tx", |
| .tx_done = mcps802154_fproc_multi_tx_tx_done, |
| .schedule_change = mcps802154_fproc_multi_tx_schedule_change, |
| }; |
| |
| /** |
| * mcps802154_fproc_multi_handle_frame() - Handle a single frame and change |
| * state. |
| * @local: MCPS private data. |
| * @access: Current access to handle. |
| * @frame_idx: Frame index in current access, must be valid. |
| * |
| * Return: 0 or error. |
| */ |
| static int mcps802154_fproc_multi_handle_frame(struct mcps802154_local *local, |
| struct mcps802154_access *access, |
| size_t frame_idx) |
| { |
| struct mcps802154_access_frame *frame; |
| struct sk_buff *skb; |
| int r; |
| |
| local->fproc.frame_idx = frame_idx; |
| |
| frame = &access->frames[frame_idx]; |
| if (!frame->is_tx) { |
| if (frame->rx.info.flags & MCPS802154_RX_INFO_AACK) |
| return -EINVAL; |
| |
| if (frame->sts_params) { |
| r = llhw_set_sts_params(local, frame->sts_params); |
| if (r) |
| return r; |
| } |
| |
| r = llhw_rx_enable(local, &frame->rx.info, 0); |
| if (r) |
| return r; |
| |
| mcps802154_fproc_change_state(local, |
| &mcps802154_fproc_multi_rx); |
| } else { |
| if (frame->tx_frame_info.rx_enable_after_tx_dtu) |
| return -EINVAL; |
| |
| skb = access->ops->tx_get_frame(access, frame_idx); |
| |
| /* TODO: prepare next RX directly. */ |
| |
| if (frame->sts_params) { |
| r = llhw_set_sts_params(local, frame->sts_params); |
| if (r) { |
| access->ops->tx_return( |
| access, frame_idx, skb, |
| MCPS802154_ACCESS_TX_RETURN_REASON_CANCEL); |
| return r; |
| } |
| } |
| |
| r = llhw_tx_frame(local, skb, &frame->tx_frame_info, 0); |
| if (r) { |
| access->ops->tx_return( |
| access, frame_idx, skb, |
| MCPS802154_ACCESS_TX_RETURN_REASON_CANCEL); |
| return r; |
| } |
| |
| local->fproc.tx_skb = skb; |
| mcps802154_ca_access_hold(local); |
| mcps802154_fproc_change_state(local, |
| &mcps802154_fproc_multi_tx); |
| } |
| |
| return 0; |
| } |
| |
| int mcps802154_fproc_multi_handle(struct mcps802154_local *local, |
| struct mcps802154_access *access) |
| { |
| int i = 1; |
| |
| if (access->n_frames == 0 || !access->frames) |
| return -EINVAL; |
| for (; i < access->n_frames; i++) { |
| struct mcps802154_access_frame *frame = &access->frames[i]; |
| /* Only first Rx can be without timeout. */ |
| if (!frame->is_tx && frame->rx.info.timeout_dtu == -1) |
| return -EINVAL; |
| } |
| return mcps802154_fproc_multi_handle_frame(local, access, 0); |
| } |