1 /* SPDX-License-Identifier: BSD-3-Clause 2 * Copyright 2008-2017 Cisco Systems, Inc. All rights reserved. 3 * Copyright 2007 Nuova Systems, Inc. All rights reserved. 4 */ 5 6 #include "enic.h" 7 #include "vnic_dev.h" 8 #include "vnic_wq.h" 9 10 void vnic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index, 11 unsigned int fetch_index, unsigned int posted_index, 12 unsigned int error_interrupt_enable, 13 unsigned int error_interrupt_offset) 14 { 15 u64 paddr; 16 unsigned int count = wq->ring.desc_count; 17 18 paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET; 19 ENIC_BUS_WRITE_8(wq->ctrl, TX_RING_BASE, paddr); 20 ENIC_BUS_WRITE_4(wq->ctrl, TX_RING_SIZE, count); 21 ENIC_BUS_WRITE_4(wq->ctrl, TX_FETCH_INDEX, fetch_index); 22 ENIC_BUS_WRITE_4(wq->ctrl, TX_POSTED_INDEX, posted_index); 23 ENIC_BUS_WRITE_4(wq->ctrl, TX_CQ_INDEX, cq_index); 24 ENIC_BUS_WRITE_4(wq->ctrl, TX_ERROR_INTR_ENABLE, error_interrupt_enable); 25 ENIC_BUS_WRITE_4(wq->ctrl, TX_ERROR_INTR_OFFSET, error_interrupt_offset); 26 ENIC_BUS_WRITE_4(wq->ctrl, TX_ERROR_STATUS, 0); 27 28 wq->head_idx = fetch_index; 29 wq->tail_idx = wq->head_idx; 30 } 31 32 void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index, 33 unsigned int error_interrupt_enable, 34 unsigned int error_interrupt_offset) 35 { 36 vnic_wq_init_start(wq, cq_index, 0, 0, 37 error_interrupt_enable, 38 error_interrupt_offset); 39 wq->cq_pend = 0; 40 wq->last_completed_index = 0; 41 } 42 43 unsigned int vnic_wq_error_status(struct vnic_wq *wq) 44 { 45 return ENIC_BUS_READ_4(wq->ctrl, TX_ERROR_STATUS); 46 } 47 48 void vnic_wq_enable(struct vnic_wq *wq) 49 { 50 ENIC_BUS_WRITE_4(wq->ctrl, TX_ENABLE, 1); 51 } 52 53 int vnic_wq_disable(struct vnic_wq *wq) 54 { 55 unsigned int wait; 56 57 ENIC_BUS_WRITE_4(wq->ctrl, TX_ENABLE, 0); 58 59 /* Wait for HW to ACK disable request */ 60 for (wait = 0; wait < 1000; wait++) { 61 if (!(ENIC_BUS_READ_4(wq->ctrl, TX_RUNNING))) 62 return 0; 63 udelay(10); 64 } 65 66 pr_err("Failed to disable WQ[%d]\n", wq->index); 67 68 return -ETIMEDOUT; 69 } 70 71 void vnic_wq_clean(struct vnic_wq *wq) 72 { 73 unsigned int to_clean = wq->tail_idx; 74 75 while (vnic_wq_desc_used(wq) > 0) { 76 to_clean = buf_idx_incr(wq->ring.desc_count, to_clean); 77 wq->ring.desc_avail++; 78 } 79 80 wq->head_idx = 0; 81 wq->tail_idx = 0; 82 wq->last_completed_index = 0; 83 84 ENIC_BUS_WRITE_4(wq->ctrl, TX_FETCH_INDEX, 0); 85 ENIC_BUS_WRITE_4(wq->ctrl, TX_POSTED_INDEX, 0); 86 ENIC_BUS_WRITE_4(wq->ctrl, TX_ERROR_STATUS, 0); 87 88 vnic_dev_clear_desc_ring(&wq->ring); 89 } 90