diff options
Diffstat (limited to 'drivers/net/wwan/t7xx/t7xx_hif_dpmaif_tx.c')
| -rw-r--r-- | drivers/net/wwan/t7xx/t7xx_hif_dpmaif_tx.c | 651 |
1 files changed, 651 insertions, 0 deletions
diff --git a/drivers/net/wwan/t7xx/t7xx_hif_dpmaif_tx.c b/drivers/net/wwan/t7xx/t7xx_hif_dpmaif_tx.c new file mode 100644 index 000000000000..e8435a871842 --- /dev/null +++ b/drivers/net/wwan/t7xx/t7xx_hif_dpmaif_tx.c @@ -0,0 +1,651 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2021, MediaTek Inc. + * Copyright (c) 2021-2022, Intel Corporation. + * + * Authors: + * Amir Hanania <amir.hanania@intel.com> + * Haijun Liu <haijun.liu@mediatek.com> + * Eliot Lee <eliot.lee@intel.com> + * Moises Veleta <moises.veleta@intel.com> + * Ricardo Martinez <ricardo.martinez@linux.intel.com> + * + * Contributors: + * Chiranjeevi Rapolu <chiranjeevi.rapolu@intel.com> + * Sreehari Kancharla <sreehari.kancharla@intel.com> + */ + +#include <linux/atomic.h> +#include <linux/bitfield.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/dma-direction.h> +#include <linux/dma-mapping.h> +#include <linux/err.h> +#include <linux/gfp.h> +#include <linux/kernel.h> +#include <linux/kthread.h> +#include <linux/list.h> +#include <linux/minmax.h> +#include <linux/netdevice.h> +#include <linux/sched.h> +#include <linux/spinlock.h> +#include <linux/skbuff.h> +#include <linux/types.h> +#include <linux/wait.h> +#include <linux/workqueue.h> + +#include "t7xx_dpmaif.h" +#include "t7xx_hif_dpmaif.h" +#include "t7xx_hif_dpmaif_tx.h" +#include "t7xx_pci.h" + +#define DPMAIF_SKB_TX_BURST_CNT 5 +#define DPMAIF_DRB_LIST_LEN 6144 + +/* DRB dtype */ +#define DES_DTYP_PD 0 +#define DES_DTYP_MSG 1 + +static unsigned int t7xx_dpmaif_update_drb_rd_idx(struct dpmaif_ctrl *dpmaif_ctrl, + unsigned int q_num) +{ + struct dpmaif_tx_queue *txq = &dpmaif_ctrl->txq[q_num]; + unsigned int old_sw_rd_idx, new_hw_rd_idx, drb_cnt; + unsigned long flags; + + if (!txq->que_started) + return 0; + + old_sw_rd_idx = txq->drb_rd_idx; + new_hw_rd_idx = t7xx_dpmaif_ul_get_rd_idx(&dpmaif_ctrl->hw_info, q_num); + if (new_hw_rd_idx >= DPMAIF_DRB_LIST_LEN) { + dev_err(dpmaif_ctrl->dev, "Out of range read index: %u\n", new_hw_rd_idx); + return 0; + } + + if (old_sw_rd_idx <= new_hw_rd_idx) + drb_cnt = new_hw_rd_idx - old_sw_rd_idx; + else + drb_cnt = txq->drb_size_cnt - old_sw_rd_idx + new_hw_rd_idx; + + spin_lock_irqsave(&txq->tx_lock, flags); + txq->drb_rd_idx = new_hw_rd_idx; + spin_unlock_irqrestore(&txq->tx_lock, flags); + + return drb_cnt; +} + +static unsigned int t7xx_dpmaif_release_tx_buffer(struct dpmaif_ctrl *dpmaif_ctrl, + unsigned int q_num, unsigned int release_cnt) +{ + struct dpmaif_tx_queue *txq = &dpmaif_ctrl->txq[q_num]; + struct dpmaif_callbacks *cb = dpmaif_ctrl->callbacks; + struct dpmaif_drb_skb *cur_drb_skb, *drb_skb_base; + struct dpmaif_drb *cur_drb, *drb_base; + unsigned int drb_cnt, i, cur_idx; + unsigned long flags; + + drb_skb_base = txq->drb_skb_base; + drb_base = txq->drb_base; + + spin_lock_irqsave(&txq->tx_lock, flags); + drb_cnt = txq->drb_size_cnt; + cur_idx = txq->drb_release_rd_idx; + spin_unlock_irqrestore(&txq->tx_lock, flags); + + for (i = 0; i < release_cnt; i++) { + cur_drb = drb_base + cur_idx; + if (FIELD_GET(DRB_HDR_DTYP, le32_to_cpu(cur_drb->header)) == DES_DTYP_PD) { + cur_drb_skb = drb_skb_base + cur_idx; + if (!cur_drb_skb->is_msg) + dma_unmap_single(dpmaif_ctrl->dev, cur_drb_skb->bus_addr, + cur_drb_skb->data_len, DMA_TO_DEVICE); + + if (!FIELD_GET(DRB_HDR_CONT, le32_to_cpu(cur_drb->header))) { + if (!cur_drb_skb->skb) { + dev_err(dpmaif_ctrl->dev, + "txq%u: DRB check fail, invalid skb\n", q_num); + continue; + } + + dev_kfree_skb_any(cur_drb_skb->skb); + } + + cur_drb_skb->skb = NULL; + } + + spin_lock_irqsave(&txq->tx_lock, flags); + cur_idx = t7xx_ring_buf_get_next_wr_idx(drb_cnt, cur_idx); + txq->drb_release_rd_idx = cur_idx; + spin_unlock_irqrestore(&txq->tx_lock, flags); + + if (atomic_inc_return(&txq->tx_budget) > txq->drb_size_cnt / 8) + cb->state_notify(dpmaif_ctrl->t7xx_dev, DMPAIF_TXQ_STATE_IRQ, txq->index); + } + + if (FIELD_GET(DRB_HDR_CONT, le32_to_cpu(cur_drb->header))) + dev_err(dpmaif_ctrl->dev, "txq%u: DRB not marked as the last one\n", q_num); + + return i; +} + +static int t7xx_dpmaif_tx_release(struct dpmaif_ctrl *dpmaif_ctrl, + unsigned int q_num, unsigned int budget) +{ + struct dpmaif_tx_queue *txq = &dpmaif_ctrl->txq[q_num]; + unsigned int rel_cnt, real_rel_cnt; + + /* Update read index from HW */ + t7xx_dpmaif_update_drb_rd_idx(dpmaif_ctrl, q_num); + + rel_cnt = t7xx_ring_buf_rd_wr_count(txq->drb_size_cnt, txq->drb_release_rd_idx, + txq->drb_rd_idx, DPMAIF_READ); + + real_rel_cnt = min_not_zero(budget, rel_cnt); + if (real_rel_cnt) + real_rel_cnt = t7xx_dpmaif_release_tx_buffer(dpmaif_ctrl, q_num, real_rel_cnt); + + return real_rel_cnt < rel_cnt ? -EAGAIN : 0; +} + +static bool t7xx_dpmaif_drb_ring_not_empty(struct dpmaif_tx_queue *txq) +{ + return !!t7xx_dpmaif_update_drb_rd_idx(txq->dpmaif_ctrl, txq->index); +} + +static void t7xx_dpmaif_tx_done(struct work_struct *work) +{ + struct dpmaif_tx_queue *txq = container_of(work, struct dpmaif_tx_queue, dpmaif_tx_work); + struct dpmaif_ctrl *dpmaif_ctrl = txq->dpmaif_ctrl; + struct dpmaif_hw_info *hw_info; + int ret; + + hw_info = &dpmaif_ctrl->hw_info; + ret = t7xx_dpmaif_tx_release(dpmaif_ctrl, txq->index, txq->drb_size_cnt); + if (ret == -EAGAIN || + (t7xx_dpmaif_ul_clr_done(hw_info, txq->index) && + t7xx_dpmaif_drb_ring_not_empty(txq))) { + queue_work(dpmaif_ctrl->txq[txq->index].worker, + &dpmaif_ctrl->txq[txq->index].dpmaif_tx_work); + /* Give the device time to enter the low power state */ + t7xx_dpmaif_clr_ip_busy_sts(hw_info); + } else { + t7xx_dpmaif_clr_ip_busy_sts(hw_info); + t7xx_dpmaif_unmask_ulq_intr(hw_info, txq->index); + } +} + +static void t7xx_setup_msg_drb(struct dpmaif_ctrl *dpmaif_ctrl, unsigned int q_num, + unsigned int cur_idx, unsigned int pkt_len, unsigned int count_l, + unsigned int channel_id) +{ + struct dpmaif_drb *drb_base = dpmaif_ctrl->txq[q_num].drb_base; + struct dpmaif_drb *drb = drb_base + cur_idx; + + drb->header = cpu_to_le32(FIELD_PREP(DRB_HDR_DTYP, DES_DTYP_MSG) | + FIELD_PREP(DRB_HDR_CONT, 1) | + FIELD_PREP(DRB_HDR_DATA_LEN, pkt_len)); + + drb->msg.msg_hdr = cpu_to_le32(FIELD_PREP(DRB_MSG_COUNT_L, count_l) | + FIELD_PREP(DRB_MSG_CHANNEL_ID, channel_id) | + FIELD_PREP(DRB_MSG_L4_CHK, 1)); +} + +static void t7xx_setup_payload_drb(struct dpmaif_ctrl *dpmaif_ctrl, unsigned int q_num, + unsigned int cur_idx, dma_addr_t data_addr, + unsigned int pkt_size, bool last_one) +{ + struct dpmaif_drb *drb_base = dpmaif_ctrl->txq[q_num].drb_base; + struct dpmaif_drb *drb = drb_base + cur_idx; + u32 header; + + header = FIELD_PREP(DRB_HDR_DTYP, DES_DTYP_PD) | FIELD_PREP(DRB_HDR_DATA_LEN, pkt_size); + if (!last_one) + header |= FIELD_PREP(DRB_HDR_CONT, 1); + + drb->header = cpu_to_le32(header); + drb->pd.data_addr_l = cpu_to_le32(lower_32_bits(data_addr)); + drb->pd.data_addr_h = cpu_to_le32(upper_32_bits(data_addr)); +} + +static void t7xx_record_drb_skb(struct dpmaif_ctrl *dpmaif_ctrl, unsigned int q_num, + unsigned int cur_idx, struct sk_buff *skb, bool is_msg, + bool is_frag, bool is_last_one, dma_addr_t bus_addr, + unsigned int data_len) +{ + struct dpmaif_drb_skb *drb_skb_base = dpmaif_ctrl->txq[q_num].drb_skb_base; + struct dpmaif_drb_skb *drb_skb = drb_skb_base + cur_idx; + + drb_skb->skb = skb; + drb_skb->bus_addr = bus_addr; + drb_skb->data_len = data_len; + drb_skb->index = cur_idx; + drb_skb->is_msg = is_msg; + drb_skb->is_frag = is_frag; + drb_skb->is_last = is_last_one; +} + +static int t7xx_dpmaif_add_skb_to_ring(struct dpmaif_ctrl *dpmaif_ctrl, struct sk_buff *skb) +{ + struct dpmaif_callbacks *cb = dpmaif_ctrl->callbacks; + unsigned int wr_cnt, send_cnt, payload_cnt; + unsigned int cur_idx, drb_wr_idx_backup; + struct skb_shared_info *shinfo; + struct dpmaif_tx_queue *txq; + struct t7xx_skb_cb *skb_cb; + unsigned long flags; + + skb_cb = T7XX_SKB_CB(skb); + txq = &dpmaif_ctrl->txq[skb_cb->txq_number]; + if (!txq->que_started || dpmaif_ctrl->state != DPMAIF_STATE_PWRON) + return -ENODEV; + + atomic_set(&txq->tx_processing, 1); + /* Ensure tx_processing is changed to 1 before actually begin TX flow */ + smp_mb(); + + shinfo = skb_shinfo(skb); + if (shinfo->frag_list) + dev_warn_ratelimited(dpmaif_ctrl->dev, "frag_list not supported\n"); + + payload_cnt = shinfo->nr_frags + 1; + /* nr_frags: frag cnt, 1: skb->data, 1: msg DRB */ + send_cnt = payload_cnt + 1; + + spin_lock_irqsave(&txq->tx_lock, flags); + cur_idx = txq->drb_wr_idx; + drb_wr_idx_backup = cur_idx; + txq->drb_wr_idx += send_cnt; + if (txq->drb_wr_idx >= txq->drb_size_cnt) + txq->drb_wr_idx -= txq->drb_size_cnt; + t7xx_setup_msg_drb(dpmaif_ctrl, txq->index, cur_idx, skb->len, 0, skb_cb->netif_idx); + t7xx_record_drb_skb(dpmaif_ctrl, txq->index, cur_idx, skb, true, 0, 0, 0, 0); + spin_unlock_irqrestore(&txq->tx_lock, flags); + + for (wr_cnt = 0; wr_cnt < payload_cnt; wr_cnt++) { + bool is_frag, is_last_one = wr_cnt == payload_cnt - 1; + unsigned int data_len; + dma_addr_t bus_addr; + void *data_addr; + + if (!wr_cnt) { + data_len = skb_headlen(skb); + data_addr = skb->data; + is_frag = false; + } else { + skb_frag_t *frag = shinfo->frags + wr_cnt - 1; + + data_len = skb_frag_size(frag); + data_addr = skb_frag_address(frag); + is_frag = true; + } + + bus_addr = dma_map_single(dpmaif_ctrl->dev, data_addr, data_len, DMA_TO_DEVICE); + if (dma_mapping_error(dpmaif_ctrl->dev, bus_addr)) + goto unmap_buffers; + + cur_idx = t7xx_ring_buf_get_next_wr_idx(txq->drb_size_cnt, cur_idx); + + spin_lock_irqsave(&txq->tx_lock, flags); + t7xx_setup_payload_drb(dpmaif_ctrl, txq->index, cur_idx, bus_addr, data_len, + is_last_one); + t7xx_record_drb_skb(dpmaif_ctrl, txq->index, cur_idx, skb, false, is_frag, + is_last_one, bus_addr, data_len); + spin_unlock_irqrestore(&txq->tx_lock, flags); + } + + if (atomic_sub_return(send_cnt, &txq->tx_budget) <= (MAX_SKB_FRAGS + 2)) + cb->state_notify(dpmaif_ctrl->t7xx_dev, DMPAIF_TXQ_STATE_FULL, txq->index); + + atomic_set(&txq->tx_processing, 0); + + return 0; + +unmap_buffers: + while (wr_cnt--) { + struct dpmaif_drb_skb *drb_skb = txq->drb_skb_base; + + cur_idx = cur_idx ? cur_idx - 1 : txq->drb_size_cnt - 1; + drb_skb += cur_idx; + dma_unmap_single(dpmaif_ctrl->dev, drb_skb->bus_addr, + drb_skb->data_len, DMA_TO_DEVICE); + } + + txq->drb_wr_idx = drb_wr_idx_backup; + atomic_set(&txq->tx_processing, 0); + + return -ENOMEM; +} + +static bool t7xx_tx_lists_are_all_empty(const struct dpmaif_ctrl *dpmaif_ctrl) +{ + int i; + + for (i = 0; i < DPMAIF_TXQ_NUM; i++) { + if (!skb_queue_empty(&dpmaif_ctrl->txq[i].tx_skb_head)) + return false; + } + + return true; +} + +/* Currently, only the default TX queue is used */ +static struct dpmaif_tx_queue *t7xx_select_tx_queue(struct dpmaif_ctrl *dpmaif_ctrl) +{ + struct dpmaif_tx_queue *txq; + + txq = &dpmaif_ctrl->txq[DPMAIF_TX_DEFAULT_QUEUE]; + if (!txq->que_started) + return NULL; + + return txq; +} + +static unsigned int t7xx_txq_drb_wr_available(struct dpmaif_tx_queue *txq) +{ + return t7xx_ring_buf_rd_wr_count(txq->drb_size_cnt, txq->drb_release_rd_idx, + txq->drb_wr_idx, DPMAIF_WRITE); +} + +static unsigned int t7xx_skb_drb_cnt(struct sk_buff *skb) +{ + /* Normal DRB (frags data + skb linear data) + msg DRB */ + return skb_shinfo(skb)->nr_frags + 2; +} + +static int t7xx_txq_burst_send_skb(struct dpmaif_tx_queue *txq) +{ + unsigned int drb_remain_cnt, i; + unsigned int send_drb_cnt; + int drb_cnt = 0; + int ret = 0; + + drb_remain_cnt = t7xx_txq_drb_wr_available(txq); + + for (i = 0; i < DPMAIF_SKB_TX_BURST_CNT; i++) { + struct sk_buff *skb; + + skb = skb_peek(&txq->tx_skb_head); + if (!skb) + break; + + send_drb_cnt = t7xx_skb_drb_cnt(skb); + if (drb_remain_cnt < send_drb_cnt) { + drb_remain_cnt = t7xx_txq_drb_wr_available(txq); + continue; + } + + drb_remain_cnt -= send_drb_cnt; + + ret = t7xx_dpmaif_add_skb_to_ring(txq->dpmaif_ctrl, skb); + if (ret < 0) { + dev_err(txq->dpmaif_ctrl->dev, + "Failed to add skb to device's ring: %d\n", ret); + break; + } + + drb_cnt += send_drb_cnt; + skb_unlink(skb, &txq->tx_skb_head); + } + + if (drb_cnt > 0) + return drb_cnt; + + return ret; +} + +static void t7xx_do_tx_hw_push(struct dpmaif_ctrl *dpmaif_ctrl) +{ + do { + struct dpmaif_tx_queue *txq; + int drb_send_cnt; + + txq = t7xx_select_tx_queue(dpmaif_ctrl); + if (!txq) + return; + + drb_send_cnt = t7xx_txq_burst_send_skb(txq); + if (drb_send_cnt <= 0) { + usleep_range(10, 20); + cond_resched(); + continue; + } + + t7xx_dpmaif_ul_update_hw_drb_cnt(&dpmaif_ctrl->hw_info, txq->index, + drb_send_cnt * DPMAIF_UL_DRB_SIZE_WORD); + + cond_resched(); + } while (!t7xx_tx_lists_are_all_empty(dpmaif_ctrl) && !kthread_should_stop() && + (dpmaif_ctrl->state == DPMAIF_STATE_PWRON)); +} + +static int t7xx_dpmaif_tx_hw_push_thread(void *arg) +{ + struct dpmaif_ctrl *dpmaif_ctrl = arg; + + while (!kthread_should_stop()) { + if (t7xx_tx_lists_are_all_empty(dpmaif_ctrl) || + dpmaif_ctrl->state != DPMAIF_STATE_PWRON) { + if (wait_event_interruptible(dpmaif_ctrl->tx_wq, + (!t7xx_tx_lists_are_all_empty(dpmaif_ctrl) && + dpmaif_ctrl->state == DPMAIF_STATE_PWRON) || + kthread_should_stop())) + continue; + + if (kthread_should_stop()) + break; + } + + t7xx_do_tx_hw_push(dpmaif_ctrl); + } + + return 0; +} + +int t7xx_dpmaif_tx_thread_init(struct dpmaif_ctrl *dpmaif_ctrl) +{ + init_waitqueue_head(&dpmaif_ctrl->tx_wq); + dpmaif_ctrl->tx_thread = kthread_run(t7xx_dpmaif_tx_hw_push_thread, + dpmaif_ctrl, "dpmaif_tx_hw_push"); + return PTR_ERR_OR_ZERO(dpmaif_ctrl->tx_thread); +} + +void t7xx_dpmaif_tx_thread_rel(struct dpmaif_ctrl *dpmaif_ctrl) +{ + if (dpmaif_ctrl->tx_thread) + kthread_stop(dpmaif_ctrl->tx_thread); +} + +/** + * t7xx_dpmaif_tx_send_skb() - Add skb to the transmit queue. + * @dpmaif_ctrl: Pointer to struct dpmaif_ctrl. + * @txq_number: Queue number to xmit on. + * @skb: Pointer to the skb to transmit. + * + * Add the skb to the queue of the skbs to be transmit. + * Wake up the thread that push the skbs from the queue to the HW. + * + * Return: + * * 0 - Success. + * * -EBUSY - Tx budget exhausted. + * In normal circumstances t7xx_dpmaif_add_skb_to_ring() must report the txq full + * state to prevent this error condition. + */ +int t7xx_dpmaif_tx_send_skb(struct dpmaif_ctrl *dpmaif_ctrl, unsigned int txq_number, + struct sk_buff *skb) +{ + struct dpmaif_tx_queue *txq = &dpmaif_ctrl->txq[txq_number]; + struct dpmaif_callbacks *cb = dpmaif_ctrl->callbacks; + struct t7xx_skb_cb *skb_cb; + + if (atomic_read(&txq->tx_budget) <= t7xx_skb_drb_cnt(skb)) { + cb->state_notify(dpmaif_ctrl->t7xx_dev, DMPAIF_TXQ_STATE_FULL, txq_number); + return -EBUSY; + } + + skb_cb = T7XX_SKB_CB(skb); + skb_cb->txq_number = txq_number; + skb_queue_tail(&txq->tx_skb_head, skb); + wake_up(&dpmaif_ctrl->tx_wq); + + return 0; +} + +void t7xx_dpmaif_irq_tx_done(struct dpmaif_ctrl *dpmaif_ctrl, unsigned int que_mask) +{ + int i; + + for (i = 0; i < DPMAIF_TXQ_NUM; i++) { + if (que_mask & BIT(i)) + queue_work(dpmaif_ctrl->txq[i].worker, &dpmaif_ctrl->txq[i].dpmaif_tx_work); + } +} + +static int t7xx_dpmaif_tx_drb_buf_init(struct dpmaif_tx_queue *txq) +{ + size_t brb_skb_size, brb_pd_size; + + brb_pd_size = DPMAIF_DRB_LIST_LEN * sizeof(struct dpmaif_drb); + brb_skb_size = DPMAIF_DRB_LIST_LEN * sizeof(struct dpmaif_drb_skb); + + txq->drb_size_cnt = DPMAIF_DRB_LIST_LEN; + + /* For HW && AP SW */ + txq->drb_base = dma_alloc_coherent(txq->dpmaif_ctrl->dev, brb_pd_size, + &txq->drb_bus_addr, GFP_KERNEL | __GFP_ZERO); + if (!txq->drb_base) + return -ENOMEM; + + /* For AP SW to record the skb information */ + txq->drb_skb_base = devm_kzalloc(txq->dpmaif_ctrl->dev, brb_skb_size, GFP_KERNEL); + if (!txq->drb_skb_base) { + dma_free_coherent(txq->dpmaif_ctrl->dev, brb_pd_size, + txq->drb_base, txq->drb_bus_addr); + return -ENOMEM; + } + + return 0; +} + +static void t7xx_dpmaif_tx_free_drb_skb(struct dpmaif_tx_queue *txq) +{ + struct dpmaif_drb_skb *drb_skb, *drb_skb_base = txq->drb_skb_base; + unsigned int i; + + if (!drb_skb_base) + return; + + for (i = 0; i < txq->drb_size_cnt; i++) { + drb_skb = drb_skb_base + i; + if (!drb_skb->skb) + continue; + + if (!drb_skb->is_msg) + dma_unmap_single(txq->dpmaif_ctrl->dev, drb_skb->bus_addr, + drb_skb->data_len, DMA_TO_DEVICE); + + if (drb_skb->is_last) { + dev_kfree_skb(drb_skb->skb); + drb_skb->skb = NULL; + } + } +} + +static void t7xx_dpmaif_tx_drb_buf_rel(struct dpmaif_tx_queue *txq) +{ + if (txq->drb_base) + dma_free_coherent(txq->dpmaif_ctrl->dev, + txq->drb_size_cnt * sizeof(struct dpmaif_drb), + txq->drb_base, txq->drb_bus_addr); + + t7xx_dpmaif_tx_free_drb_skb(txq); +} + +/** + * t7xx_dpmaif_txq_init() - Initialize TX queue. + * @txq: Pointer to struct dpmaif_tx_queue. + * + * Initialize the TX queue data structure and allocate memory for it to use. + * + * Return: + * * 0 - Success. + * * -ERROR - Error code from failure sub-initializations. + */ +int t7xx_dpmaif_txq_init(struct dpmaif_tx_queue *txq) +{ + int ret; + + skb_queue_head_init(&txq->tx_skb_head); + init_waitqueue_head(&txq->req_wq); + atomic_set(&txq->tx_budget, DPMAIF_DRB_LIST_LEN); + + ret = t7xx_dpmaif_tx_drb_buf_init(txq); + if (ret) { + dev_err(txq->dpmaif_ctrl->dev, "Failed to initialize DRB buffers: %d\n", ret); + return ret; + } + + txq->worker = alloc_workqueue("md_dpmaif_tx%d_worker", WQ_UNBOUND | WQ_MEM_RECLAIM | + (txq->index ? 0 : WQ_HIGHPRI), 1, txq->index); + if (!txq->worker) + return -ENOMEM; + + INIT_WORK(&txq->dpmaif_tx_work, t7xx_dpmaif_tx_done); + spin_lock_init(&txq->tx_lock); + + return 0; +} + +void t7xx_dpmaif_txq_free(struct dpmaif_tx_queue *txq) +{ + if (txq->worker) + destroy_workqueue(txq->worker); + + skb_queue_purge(&txq->tx_skb_head); + t7xx_dpmaif_tx_drb_buf_rel(txq); +} + +void t7xx_dpmaif_tx_stop(struct dpmaif_ctrl *dpmaif_ctrl) +{ + int i; + + for (i = 0; i < DPMAIF_TXQ_NUM; i++) { + struct dpmaif_tx_queue *txq; + int count = 0; + + txq = &dpmaif_ctrl->txq[i]; + txq->que_started = false; + /* Make sure TXQ is disabled */ + smp_mb(); + + /* Wait for active Tx to be done */ + while (atomic_read(&txq->tx_processing)) { + if (++count >= DPMAIF_MAX_CHECK_COUNT) { + dev_err(dpmaif_ctrl->dev, "TX queue stop failed\n"); + break; + } + } + } +} + +static void t7xx_dpmaif_txq_flush_rel(struct dpmaif_tx_queue *txq) +{ + txq->que_started = false; + + cancel_work_sync(&txq->dpmaif_tx_work); + flush_work(&txq->dpmaif_tx_work); + t7xx_dpmaif_tx_free_drb_skb(txq); + + txq->drb_rd_idx = 0; + txq->drb_wr_idx = 0; + txq->drb_release_rd_idx = 0; +} + +void t7xx_dpmaif_tx_clear(struct dpmaif_ctrl *dpmaif_ctrl) +{ + int i; + + for (i = 0; i < DPMAIF_TXQ_NUM; i++) + t7xx_dpmaif_txq_flush_rel(&dpmaif_ctrl->txq[i]); +} |