diff options
Diffstat (limited to 'drivers/net/wwan/t7xx/t7xx_hif_dpmaif.c')
| -rw-r--r-- | drivers/net/wwan/t7xx/t7xx_hif_dpmaif.c | 574 |
1 files changed, 574 insertions, 0 deletions
diff --git a/drivers/net/wwan/t7xx/t7xx_hif_dpmaif.c b/drivers/net/wwan/t7xx/t7xx_hif_dpmaif.c new file mode 100644 index 000000000000..7eff3531b9a5 --- /dev/null +++ b/drivers/net/wwan/t7xx/t7xx_hif_dpmaif.c @@ -0,0 +1,574 @@ +// 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> + * Moises Veleta <moises.veleta@intel.com> + * Ricardo Martinez <ricardo.martinez@linux.intel.com> + * + * Contributors: + * Chiranjeevi Rapolu <chiranjeevi.rapolu@intel.com> + * Eliot Lee <eliot.lee@intel.com> + * Sreehari Kancharla <sreehari.kancharla@intel.com> + */ + +#include <linux/device.h> +#include <linux/gfp.h> +#include <linux/irqreturn.h> +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/string.h> +#include <linux/wait.h> +#include <linux/workqueue.h> + +#include "t7xx_dpmaif.h" +#include "t7xx_hif_dpmaif.h" +#include "t7xx_hif_dpmaif_rx.h" +#include "t7xx_hif_dpmaif_tx.h" +#include "t7xx_pci.h" +#include "t7xx_pcie_mac.h" +#include "t7xx_state_monitor.h" + +unsigned int t7xx_ring_buf_get_next_wr_idx(unsigned int buf_len, unsigned int buf_idx) +{ + buf_idx++; + + return buf_idx < buf_len ? buf_idx : 0; +} + +unsigned int t7xx_ring_buf_rd_wr_count(unsigned int total_cnt, unsigned int rd_idx, + unsigned int wr_idx, enum dpmaif_rdwr rd_wr) +{ + int pkt_cnt; + + if (rd_wr == DPMAIF_READ) + pkt_cnt = wr_idx - rd_idx; + else + pkt_cnt = rd_idx - wr_idx - 1; + + if (pkt_cnt < 0) + pkt_cnt += total_cnt; + + return (unsigned int)pkt_cnt; +} + +static void t7xx_dpmaif_enable_irq(struct dpmaif_ctrl *dpmaif_ctrl) +{ + struct dpmaif_isr_para *isr_para; + int i; + + for (i = 0; i < ARRAY_SIZE(dpmaif_ctrl->isr_para); i++) { + isr_para = &dpmaif_ctrl->isr_para[i]; + t7xx_pcie_mac_set_int(dpmaif_ctrl->t7xx_dev, isr_para->pcie_int); + } +} + +static void t7xx_dpmaif_disable_irq(struct dpmaif_ctrl *dpmaif_ctrl) +{ + struct dpmaif_isr_para *isr_para; + int i; + + for (i = 0; i < ARRAY_SIZE(dpmaif_ctrl->isr_para); i++) { + isr_para = &dpmaif_ctrl->isr_para[i]; + t7xx_pcie_mac_clear_int(dpmaif_ctrl->t7xx_dev, isr_para->pcie_int); + } +} + +static void t7xx_dpmaif_irq_cb(struct dpmaif_isr_para *isr_para) +{ + struct dpmaif_ctrl *dpmaif_ctrl = isr_para->dpmaif_ctrl; + struct dpmaif_hw_intr_st_para intr_status; + struct device *dev = dpmaif_ctrl->dev; + struct dpmaif_hw_info *hw_info; + int i; + + memset(&intr_status, 0, sizeof(intr_status)); + hw_info = &dpmaif_ctrl->hw_info; + + if (t7xx_dpmaif_hw_get_intr_cnt(hw_info, &intr_status, isr_para->dlq_id) < 0) { + dev_err(dev, "Failed to get HW interrupt count\n"); + return; + } + + t7xx_pcie_mac_clear_int_status(dpmaif_ctrl->t7xx_dev, isr_para->pcie_int); + + for (i = 0; i < intr_status.intr_cnt; i++) { + switch (intr_status.intr_types[i]) { + case DPF_INTR_UL_DONE: + t7xx_dpmaif_irq_tx_done(dpmaif_ctrl, intr_status.intr_queues[i]); + break; + + case DPF_INTR_UL_DRB_EMPTY: + case DPF_INTR_UL_MD_NOTREADY: + case DPF_INTR_UL_MD_PWR_NOTREADY: + /* No need to log an error for these */ + break; + + case DPF_INTR_DL_BATCNT_LEN_ERR: + dev_err_ratelimited(dev, "DL interrupt: packet BAT count length error\n"); + t7xx_dpmaif_dl_unmask_batcnt_len_err_intr(hw_info); + break; + + case DPF_INTR_DL_PITCNT_LEN_ERR: + dev_err_ratelimited(dev, "DL interrupt: PIT count length error\n"); + t7xx_dpmaif_dl_unmask_pitcnt_len_err_intr(hw_info); + break; + + case DPF_INTR_DL_Q0_PITCNT_LEN_ERR: + dev_err_ratelimited(dev, "DL interrupt: DLQ0 PIT count length error\n"); + t7xx_dpmaif_dlq_unmask_pitcnt_len_err_intr(hw_info, DPF_RX_QNO_DFT); + break; + + case DPF_INTR_DL_Q1_PITCNT_LEN_ERR: + dev_err_ratelimited(dev, "DL interrupt: DLQ1 PIT count length error\n"); + t7xx_dpmaif_dlq_unmask_pitcnt_len_err_intr(hw_info, DPF_RX_QNO1); + break; + + case DPF_INTR_DL_DONE: + case DPF_INTR_DL_Q0_DONE: + case DPF_INTR_DL_Q1_DONE: + t7xx_dpmaif_irq_rx_done(dpmaif_ctrl, intr_status.intr_queues[i]); + break; + + default: + dev_err_ratelimited(dev, "DL interrupt error: unknown type : %d\n", + intr_status.intr_types[i]); + } + } +} + +static irqreturn_t t7xx_dpmaif_isr_handler(int irq, void *data) +{ + struct dpmaif_isr_para *isr_para = data; + struct dpmaif_ctrl *dpmaif_ctrl; + + dpmaif_ctrl = isr_para->dpmaif_ctrl; + if (dpmaif_ctrl->state != DPMAIF_STATE_PWRON) { + dev_err(dpmaif_ctrl->dev, "Interrupt received before initializing DPMAIF\n"); + return IRQ_HANDLED; + } + + t7xx_pcie_mac_clear_int(dpmaif_ctrl->t7xx_dev, isr_para->pcie_int); + t7xx_dpmaif_irq_cb(isr_para); + t7xx_pcie_mac_set_int(dpmaif_ctrl->t7xx_dev, isr_para->pcie_int); + return IRQ_HANDLED; +} + +static void t7xx_dpmaif_isr_parameter_init(struct dpmaif_ctrl *dpmaif_ctrl) +{ + struct dpmaif_isr_para *isr_para; + unsigned char i; + + dpmaif_ctrl->rxq_int_mapping[DPF_RX_QNO0] = DPMAIF_INT; + dpmaif_ctrl->rxq_int_mapping[DPF_RX_QNO1] = DPMAIF2_INT; + + for (i = 0; i < DPMAIF_RXQ_NUM; i++) { + isr_para = &dpmaif_ctrl->isr_para[i]; + isr_para->dpmaif_ctrl = dpmaif_ctrl; + isr_para->dlq_id = i; + isr_para->pcie_int = dpmaif_ctrl->rxq_int_mapping[i]; + } +} + +static void t7xx_dpmaif_register_pcie_irq(struct dpmaif_ctrl *dpmaif_ctrl) +{ + struct t7xx_pci_dev *t7xx_dev = dpmaif_ctrl->t7xx_dev; + struct dpmaif_isr_para *isr_para; + enum t7xx_int int_type; + int i; + + t7xx_dpmaif_isr_parameter_init(dpmaif_ctrl); + + for (i = 0; i < DPMAIF_RXQ_NUM; i++) { + isr_para = &dpmaif_ctrl->isr_para[i]; + int_type = isr_para->pcie_int; + t7xx_pcie_mac_clear_int(t7xx_dev, int_type); + + t7xx_dev->intr_handler[int_type] = t7xx_dpmaif_isr_handler; + t7xx_dev->intr_thread[int_type] = NULL; + t7xx_dev->callback_param[int_type] = isr_para; + + t7xx_pcie_mac_clear_int_status(t7xx_dev, int_type); + t7xx_pcie_mac_set_int(t7xx_dev, int_type); + } +} + +static int t7xx_dpmaif_rxtx_sw_allocs(struct dpmaif_ctrl *dpmaif_ctrl) +{ + struct dpmaif_rx_queue *rx_q; + struct dpmaif_tx_queue *tx_q; + int ret, rx_idx, tx_idx, i; + + ret = t7xx_dpmaif_bat_alloc(dpmaif_ctrl, &dpmaif_ctrl->bat_req, BAT_TYPE_NORMAL); + if (ret) { + dev_err(dpmaif_ctrl->dev, "Failed to allocate normal BAT table: %d\n", ret); + return ret; + } + + ret = t7xx_dpmaif_bat_alloc(dpmaif_ctrl, &dpmaif_ctrl->bat_frag, BAT_TYPE_FRAG); + if (ret) { + dev_err(dpmaif_ctrl->dev, "Failed to allocate frag BAT table: %d\n", ret); + goto err_free_normal_bat; + } + + for (rx_idx = 0; rx_idx < DPMAIF_RXQ_NUM; rx_idx++) { + rx_q = &dpmaif_ctrl->rxq[rx_idx]; + rx_q->index = rx_idx; + rx_q->dpmaif_ctrl = dpmaif_ctrl; + ret = t7xx_dpmaif_rxq_init(rx_q); + if (ret) + goto err_free_rxq; + } + + for (tx_idx = 0; tx_idx < DPMAIF_TXQ_NUM; tx_idx++) { + tx_q = &dpmaif_ctrl->txq[tx_idx]; + tx_q->index = tx_idx; + tx_q->dpmaif_ctrl = dpmaif_ctrl; + ret = t7xx_dpmaif_txq_init(tx_q); + if (ret) + goto err_free_txq; + } + + ret = t7xx_dpmaif_tx_thread_init(dpmaif_ctrl); + if (ret) { + dev_err(dpmaif_ctrl->dev, "Failed to start TX thread\n"); + goto err_free_txq; + } + + ret = t7xx_dpmaif_bat_rel_wq_alloc(dpmaif_ctrl); + if (ret) + goto err_thread_rel; + + return 0; + +err_thread_rel: + t7xx_dpmaif_tx_thread_rel(dpmaif_ctrl); + +err_free_txq: + for (i = 0; i < tx_idx; i++) { + tx_q = &dpmaif_ctrl->txq[i]; + t7xx_dpmaif_txq_free(tx_q); + } + +err_free_rxq: + for (i = 0; i < rx_idx; i++) { + rx_q = &dpmaif_ctrl->rxq[i]; + t7xx_dpmaif_rxq_free(rx_q); + } + + t7xx_dpmaif_bat_free(dpmaif_ctrl, &dpmaif_ctrl->bat_frag); + +err_free_normal_bat: + t7xx_dpmaif_bat_free(dpmaif_ctrl, &dpmaif_ctrl->bat_req); + + return ret; +} + +static void t7xx_dpmaif_sw_release(struct dpmaif_ctrl *dpmaif_ctrl) +{ + struct dpmaif_rx_queue *rx_q; + struct dpmaif_tx_queue *tx_q; + int i; + + t7xx_dpmaif_tx_thread_rel(dpmaif_ctrl); + t7xx_dpmaif_bat_wq_rel(dpmaif_ctrl); + + for (i = 0; i < DPMAIF_TXQ_NUM; i++) { + tx_q = &dpmaif_ctrl->txq[i]; + t7xx_dpmaif_txq_free(tx_q); + } + + for (i = 0; i < DPMAIF_RXQ_NUM; i++) { + rx_q = &dpmaif_ctrl->rxq[i]; + t7xx_dpmaif_rxq_free(rx_q); + } +} + +static int t7xx_dpmaif_start(struct dpmaif_ctrl *dpmaif_ctrl) +{ + struct dpmaif_hw_info *hw_info = &dpmaif_ctrl->hw_info; + struct dpmaif_hw_params hw_init_para; + struct dpmaif_rx_queue *rxq; + struct dpmaif_tx_queue *txq; + unsigned int buf_cnt; + int i, ret = 0; + + if (dpmaif_ctrl->state == DPMAIF_STATE_PWRON) + return -EFAULT; + + memset(&hw_init_para, 0, sizeof(hw_init_para)); + + for (i = 0; i < DPMAIF_RXQ_NUM; i++) { + rxq = &dpmaif_ctrl->rxq[i]; + rxq->que_started = true; + rxq->index = i; + rxq->budget = rxq->bat_req->bat_size_cnt - 1; + + hw_init_para.pkt_bat_base_addr[i] = rxq->bat_req->bat_bus_addr; + hw_init_para.pkt_bat_size_cnt[i] = rxq->bat_req->bat_size_cnt; + hw_init_para.pit_base_addr[i] = rxq->pit_bus_addr; + hw_init_para.pit_size_cnt[i] = rxq->pit_size_cnt; + hw_init_para.frg_bat_base_addr[i] = rxq->bat_frag->bat_bus_addr; + hw_init_para.frg_bat_size_cnt[i] = rxq->bat_frag->bat_size_cnt; + } + + bitmap_zero(dpmaif_ctrl->bat_req.bat_bitmap, dpmaif_ctrl->bat_req.bat_size_cnt); + buf_cnt = dpmaif_ctrl->bat_req.bat_size_cnt - 1; + ret = t7xx_dpmaif_rx_buf_alloc(dpmaif_ctrl, &dpmaif_ctrl->bat_req, 0, buf_cnt, true); + if (ret) { + dev_err(dpmaif_ctrl->dev, "Failed to allocate RX buffer: %d\n", ret); + return ret; + } + + buf_cnt = dpmaif_ctrl->bat_frag.bat_size_cnt - 1; + ret = t7xx_dpmaif_rx_frag_alloc(dpmaif_ctrl, &dpmaif_ctrl->bat_frag, buf_cnt, true); + if (ret) { + dev_err(dpmaif_ctrl->dev, "Failed to allocate frag RX buffer: %d\n", ret); + goto err_free_normal_bat; + } + + for (i = 0; i < DPMAIF_TXQ_NUM; i++) { + txq = &dpmaif_ctrl->txq[i]; + txq->que_started = true; + + hw_init_para.drb_base_addr[i] = txq->drb_bus_addr; + hw_init_para.drb_size_cnt[i] = txq->drb_size_cnt; + } + + ret = t7xx_dpmaif_hw_init(hw_info, &hw_init_para); + if (ret) { + dev_err(dpmaif_ctrl->dev, "Failed to initialize DPMAIF HW: %d\n", ret); + goto err_free_frag_bat; + } + + ret = t7xx_dpmaif_dl_snd_hw_bat_cnt(hw_info, rxq->bat_req->bat_size_cnt - 1); + if (ret) + goto err_free_frag_bat; + + ret = t7xx_dpmaif_dl_snd_hw_frg_cnt(hw_info, rxq->bat_frag->bat_size_cnt - 1); + if (ret) + goto err_free_frag_bat; + + t7xx_dpmaif_ul_clr_all_intr(hw_info); + t7xx_dpmaif_dl_clr_all_intr(hw_info); + dpmaif_ctrl->state = DPMAIF_STATE_PWRON; + t7xx_dpmaif_enable_irq(dpmaif_ctrl); + wake_up(&dpmaif_ctrl->tx_wq); + return 0; + +err_free_frag_bat: + t7xx_dpmaif_bat_free(rxq->dpmaif_ctrl, rxq->bat_frag); + +err_free_normal_bat: + t7xx_dpmaif_bat_free(rxq->dpmaif_ctrl, rxq->bat_req); + + return ret; +} + +static void t7xx_dpmaif_stop_sw(struct dpmaif_ctrl *dpmaif_ctrl) +{ + t7xx_dpmaif_tx_stop(dpmaif_ctrl); + t7xx_dpmaif_rx_stop(dpmaif_ctrl); +} + +static void t7xx_dpmaif_stop_hw(struct dpmaif_ctrl *dpmaif_ctrl) +{ + t7xx_dpmaif_hw_stop_all_txq(&dpmaif_ctrl->hw_info); + t7xx_dpmaif_hw_stop_all_rxq(&dpmaif_ctrl->hw_info); +} + +static int t7xx_dpmaif_stop(struct dpmaif_ctrl *dpmaif_ctrl) +{ + if (!dpmaif_ctrl->dpmaif_sw_init_done) { + dev_err(dpmaif_ctrl->dev, "dpmaif SW init fail\n"); + return -EFAULT; + } + + if (dpmaif_ctrl->state == DPMAIF_STATE_PWROFF) + return -EFAULT; + + t7xx_dpmaif_disable_irq(dpmaif_ctrl); + dpmaif_ctrl->state = DPMAIF_STATE_PWROFF; + t7xx_dpmaif_stop_sw(dpmaif_ctrl); + t7xx_dpmaif_tx_clear(dpmaif_ctrl); + t7xx_dpmaif_rx_clear(dpmaif_ctrl); + return 0; +} + +static int t7xx_dpmaif_suspend(struct t7xx_pci_dev *t7xx_dev, void *param) +{ + struct dpmaif_ctrl *dpmaif_ctrl = param; + + t7xx_dpmaif_tx_stop(dpmaif_ctrl); + t7xx_dpmaif_hw_stop_all_txq(&dpmaif_ctrl->hw_info); + t7xx_dpmaif_hw_stop_all_rxq(&dpmaif_ctrl->hw_info); + t7xx_dpmaif_disable_irq(dpmaif_ctrl); + t7xx_dpmaif_rx_stop(dpmaif_ctrl); + return 0; +} + +static void t7xx_dpmaif_unmask_dlq_intr(struct dpmaif_ctrl *dpmaif_ctrl) +{ + int qno; + + for (qno = 0; qno < DPMAIF_RXQ_NUM; qno++) + t7xx_dpmaif_dlq_unmask_rx_done(&dpmaif_ctrl->hw_info, qno); +} + +static void t7xx_dpmaif_start_txrx_qs(struct dpmaif_ctrl *dpmaif_ctrl) +{ + struct dpmaif_rx_queue *rxq; + struct dpmaif_tx_queue *txq; + unsigned int que_cnt; + + for (que_cnt = 0; que_cnt < DPMAIF_TXQ_NUM; que_cnt++) { + txq = &dpmaif_ctrl->txq[que_cnt]; + txq->que_started = true; + } + + for (que_cnt = 0; que_cnt < DPMAIF_RXQ_NUM; que_cnt++) { + rxq = &dpmaif_ctrl->rxq[que_cnt]; + rxq->que_started = true; + } +} + +static int t7xx_dpmaif_resume(struct t7xx_pci_dev *t7xx_dev, void *param) +{ + struct dpmaif_ctrl *dpmaif_ctrl = param; + + if (!dpmaif_ctrl) + return 0; + + t7xx_dpmaif_start_txrx_qs(dpmaif_ctrl); + t7xx_dpmaif_enable_irq(dpmaif_ctrl); + t7xx_dpmaif_unmask_dlq_intr(dpmaif_ctrl); + t7xx_dpmaif_start_hw(&dpmaif_ctrl->hw_info); + wake_up(&dpmaif_ctrl->tx_wq); + return 0; +} + +static int t7xx_dpmaif_pm_entity_init(struct dpmaif_ctrl *dpmaif_ctrl) +{ + struct md_pm_entity *dpmaif_pm_entity = &dpmaif_ctrl->dpmaif_pm_entity; + int ret; + + INIT_LIST_HEAD(&dpmaif_pm_entity->entity); + dpmaif_pm_entity->suspend = &t7xx_dpmaif_suspend; + dpmaif_pm_entity->suspend_late = NULL; + dpmaif_pm_entity->resume_early = NULL; + dpmaif_pm_entity->resume = &t7xx_dpmaif_resume; + dpmaif_pm_entity->id = PM_ENTITY_ID_DATA; + dpmaif_pm_entity->entity_param = dpmaif_ctrl; + + ret = t7xx_pci_pm_entity_register(dpmaif_ctrl->t7xx_dev, dpmaif_pm_entity); + if (ret) + dev_err(dpmaif_ctrl->dev, "dpmaif register pm_entity fail\n"); + + return ret; +} + +static int t7xx_dpmaif_pm_entity_release(struct dpmaif_ctrl *dpmaif_ctrl) +{ + struct md_pm_entity *dpmaif_pm_entity = &dpmaif_ctrl->dpmaif_pm_entity; + int ret; + + ret = t7xx_pci_pm_entity_unregister(dpmaif_ctrl->t7xx_dev, dpmaif_pm_entity); + if (ret < 0) + dev_err(dpmaif_ctrl->dev, "dpmaif register pm_entity fail\n"); + + return ret; +} + +int t7xx_dpmaif_md_state_callback(struct dpmaif_ctrl *dpmaif_ctrl, enum md_state state) +{ + int ret = 0; + + switch (state) { + case MD_STATE_WAITING_FOR_HS1: + ret = t7xx_dpmaif_start(dpmaif_ctrl); + break; + + case MD_STATE_EXCEPTION: + ret = t7xx_dpmaif_stop(dpmaif_ctrl); + break; + + case MD_STATE_STOPPED: + ret = t7xx_dpmaif_stop(dpmaif_ctrl); + break; + + case MD_STATE_WAITING_TO_STOP: + t7xx_dpmaif_stop_hw(dpmaif_ctrl); + break; + + default: + break; + } + + return ret; +} + +/** + * t7xx_dpmaif_hif_init() - Initialize data path. + * @t7xx_dev: MTK context structure. + * @callbacks: Callbacks implemented by the network layer to handle RX skb and + * event notifications. + * + * Allocate and initialize datapath control block. + * Register datapath ISR, TX and RX resources. + * + * Return: + * * dpmaif_ctrl pointer - Pointer to DPMAIF context structure. + * * NULL - In case of error. + */ +struct dpmaif_ctrl *t7xx_dpmaif_hif_init(struct t7xx_pci_dev *t7xx_dev, + struct dpmaif_callbacks *callbacks) +{ + struct device *dev = &t7xx_dev->pdev->dev; + struct dpmaif_ctrl *dpmaif_ctrl; + int ret; + + if (!callbacks) + return NULL; + + dpmaif_ctrl = devm_kzalloc(dev, sizeof(*dpmaif_ctrl), GFP_KERNEL); + if (!dpmaif_ctrl) + return NULL; + + dpmaif_ctrl->t7xx_dev = t7xx_dev; + dpmaif_ctrl->callbacks = callbacks; + dpmaif_ctrl->dev = dev; + dpmaif_ctrl->dpmaif_sw_init_done = false; + dpmaif_ctrl->hw_info.dev = dev; + dpmaif_ctrl->hw_info.pcie_base = t7xx_dev->base_addr.pcie_ext_reg_base - + t7xx_dev->base_addr.pcie_dev_reg_trsl_addr; + + ret = t7xx_dpmaif_pm_entity_init(dpmaif_ctrl); + if (ret) + return NULL; + + t7xx_dpmaif_register_pcie_irq(dpmaif_ctrl); + t7xx_dpmaif_disable_irq(dpmaif_ctrl); + + ret = t7xx_dpmaif_rxtx_sw_allocs(dpmaif_ctrl); + if (ret) { + t7xx_dpmaif_pm_entity_release(dpmaif_ctrl); + dev_err(dev, "Failed to allocate RX/TX SW resources: %d\n", ret); + return NULL; + } + + dpmaif_ctrl->dpmaif_sw_init_done = true; + return dpmaif_ctrl; +} + +void t7xx_dpmaif_hif_exit(struct dpmaif_ctrl *dpmaif_ctrl) +{ + if (dpmaif_ctrl->dpmaif_sw_init_done) { + t7xx_dpmaif_stop(dpmaif_ctrl); + t7xx_dpmaif_pm_entity_release(dpmaif_ctrl); + t7xx_dpmaif_sw_release(dpmaif_ctrl); + dpmaif_ctrl->dpmaif_sw_init_done = false; + } +} |