diff options
Diffstat (limited to 'kernel/drivers/net/wireless/ath/wcn36xx/dxe.c')
| -rw-r--r-- | kernel/drivers/net/wireless/ath/wcn36xx/dxe.c | 816 |
1 files changed, 816 insertions, 0 deletions
diff --git a/kernel/drivers/net/wireless/ath/wcn36xx/dxe.c b/kernel/drivers/net/wireless/ath/wcn36xx/dxe.c new file mode 100644 index 000000000..086549b73 --- /dev/null +++ b/kernel/drivers/net/wireless/ath/wcn36xx/dxe.c @@ -0,0 +1,816 @@ +/* + * Copyright (c) 2013 Eugene Krasnikov <k.eugene.e@gmail.com> + * + * 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. + */ + +/* DXE - DMA transfer engine + * we have 2 channels(High prio and Low prio) for TX and 2 channels for RX. + * through low channels data packets are transfered + * through high channels managment packets are transfered + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/interrupt.h> +#include "wcn36xx.h" +#include "txrx.h" + +void *wcn36xx_dxe_get_next_bd(struct wcn36xx *wcn, bool is_low) +{ + struct wcn36xx_dxe_ch *ch = is_low ? + &wcn->dxe_tx_l_ch : + &wcn->dxe_tx_h_ch; + + return ch->head_blk_ctl->bd_cpu_addr; +} + +static void wcn36xx_dxe_write_register(struct wcn36xx *wcn, int addr, int data) +{ + wcn36xx_dbg(WCN36XX_DBG_DXE, + "wcn36xx_dxe_write_register: addr=%x, data=%x\n", + addr, data); + + writel(data, wcn->mmio + addr); +} + +#define wcn36xx_dxe_write_register_x(wcn, reg, reg_data) \ +do { \ + if (wcn->chip_version == WCN36XX_CHIP_3680) \ + wcn36xx_dxe_write_register(wcn, reg ## _3680, reg_data); \ + else \ + wcn36xx_dxe_write_register(wcn, reg ## _3660, reg_data); \ +} while (0) \ + +static void wcn36xx_dxe_read_register(struct wcn36xx *wcn, int addr, int *data) +{ + *data = readl(wcn->mmio + addr); + + wcn36xx_dbg(WCN36XX_DBG_DXE, + "wcn36xx_dxe_read_register: addr=%x, data=%x\n", + addr, *data); +} + +static void wcn36xx_dxe_free_ctl_block(struct wcn36xx_dxe_ch *ch) +{ + struct wcn36xx_dxe_ctl *ctl = ch->head_blk_ctl, *next; + int i; + + for (i = 0; i < ch->desc_num && ctl; i++) { + next = ctl->next; + kfree(ctl); + ctl = next; + } +} + +static int wcn36xx_dxe_allocate_ctl_block(struct wcn36xx_dxe_ch *ch) +{ + struct wcn36xx_dxe_ctl *prev_ctl = NULL; + struct wcn36xx_dxe_ctl *cur_ctl = NULL; + int i; + + for (i = 0; i < ch->desc_num; i++) { + cur_ctl = kzalloc(sizeof(*cur_ctl), GFP_KERNEL); + if (!cur_ctl) + goto out_fail; + + spin_lock_init(&cur_ctl->skb_lock); + cur_ctl->ctl_blk_order = i; + if (i == 0) { + ch->head_blk_ctl = cur_ctl; + ch->tail_blk_ctl = cur_ctl; + } else if (ch->desc_num - 1 == i) { + prev_ctl->next = cur_ctl; + cur_ctl->next = ch->head_blk_ctl; + } else { + prev_ctl->next = cur_ctl; + } + prev_ctl = cur_ctl; + } + + return 0; + +out_fail: + wcn36xx_dxe_free_ctl_block(ch); + return -ENOMEM; +} + +int wcn36xx_dxe_alloc_ctl_blks(struct wcn36xx *wcn) +{ + int ret; + + wcn->dxe_tx_l_ch.ch_type = WCN36XX_DXE_CH_TX_L; + wcn->dxe_tx_h_ch.ch_type = WCN36XX_DXE_CH_TX_H; + wcn->dxe_rx_l_ch.ch_type = WCN36XX_DXE_CH_RX_L; + wcn->dxe_rx_h_ch.ch_type = WCN36XX_DXE_CH_RX_H; + + wcn->dxe_tx_l_ch.desc_num = WCN36XX_DXE_CH_DESC_NUMB_TX_L; + wcn->dxe_tx_h_ch.desc_num = WCN36XX_DXE_CH_DESC_NUMB_TX_H; + wcn->dxe_rx_l_ch.desc_num = WCN36XX_DXE_CH_DESC_NUMB_RX_L; + wcn->dxe_rx_h_ch.desc_num = WCN36XX_DXE_CH_DESC_NUMB_RX_H; + + wcn->dxe_tx_l_ch.dxe_wq = WCN36XX_DXE_WQ_TX_L; + wcn->dxe_tx_h_ch.dxe_wq = WCN36XX_DXE_WQ_TX_H; + + wcn->dxe_tx_l_ch.ctrl_bd = WCN36XX_DXE_CTRL_TX_L_BD; + wcn->dxe_tx_h_ch.ctrl_bd = WCN36XX_DXE_CTRL_TX_H_BD; + + wcn->dxe_tx_l_ch.ctrl_skb = WCN36XX_DXE_CTRL_TX_L_SKB; + wcn->dxe_tx_h_ch.ctrl_skb = WCN36XX_DXE_CTRL_TX_H_SKB; + + wcn->dxe_tx_l_ch.reg_ctrl = WCN36XX_DXE_REG_CTL_TX_L; + wcn->dxe_tx_h_ch.reg_ctrl = WCN36XX_DXE_REG_CTL_TX_H; + + wcn->dxe_tx_l_ch.def_ctrl = WCN36XX_DXE_CH_DEFAULT_CTL_TX_L; + wcn->dxe_tx_h_ch.def_ctrl = WCN36XX_DXE_CH_DEFAULT_CTL_TX_H; + + /* DXE control block allocation */ + ret = wcn36xx_dxe_allocate_ctl_block(&wcn->dxe_tx_l_ch); + if (ret) + goto out_err; + ret = wcn36xx_dxe_allocate_ctl_block(&wcn->dxe_tx_h_ch); + if (ret) + goto out_err; + ret = wcn36xx_dxe_allocate_ctl_block(&wcn->dxe_rx_l_ch); + if (ret) + goto out_err; + ret = wcn36xx_dxe_allocate_ctl_block(&wcn->dxe_rx_h_ch); + if (ret) + goto out_err; + + /* Initialize SMSM state Clear TX Enable RING EMPTY STATE */ + ret = wcn->ctrl_ops->smsm_change_state( + WCN36XX_SMSM_WLAN_TX_ENABLE, + WCN36XX_SMSM_WLAN_TX_RINGS_EMPTY); + + return 0; + +out_err: + wcn36xx_err("Failed to allocate DXE control blocks\n"); + wcn36xx_dxe_free_ctl_blks(wcn); + return -ENOMEM; +} + +void wcn36xx_dxe_free_ctl_blks(struct wcn36xx *wcn) +{ + wcn36xx_dxe_free_ctl_block(&wcn->dxe_tx_l_ch); + wcn36xx_dxe_free_ctl_block(&wcn->dxe_tx_h_ch); + wcn36xx_dxe_free_ctl_block(&wcn->dxe_rx_l_ch); + wcn36xx_dxe_free_ctl_block(&wcn->dxe_rx_h_ch); +} + +static int wcn36xx_dxe_init_descs(struct wcn36xx_dxe_ch *wcn_ch) +{ + struct wcn36xx_dxe_desc *cur_dxe = NULL; + struct wcn36xx_dxe_desc *prev_dxe = NULL; + struct wcn36xx_dxe_ctl *cur_ctl = NULL; + size_t size; + int i; + + size = wcn_ch->desc_num * sizeof(struct wcn36xx_dxe_desc); + wcn_ch->cpu_addr = dma_alloc_coherent(NULL, size, &wcn_ch->dma_addr, + GFP_KERNEL); + if (!wcn_ch->cpu_addr) + return -ENOMEM; + + memset(wcn_ch->cpu_addr, 0, size); + + cur_dxe = (struct wcn36xx_dxe_desc *)wcn_ch->cpu_addr; + cur_ctl = wcn_ch->head_blk_ctl; + + for (i = 0; i < wcn_ch->desc_num; i++) { + cur_ctl->desc = cur_dxe; + cur_ctl->desc_phy_addr = wcn_ch->dma_addr + + i * sizeof(struct wcn36xx_dxe_desc); + + switch (wcn_ch->ch_type) { + case WCN36XX_DXE_CH_TX_L: + cur_dxe->ctrl = WCN36XX_DXE_CTRL_TX_L; + cur_dxe->dst_addr_l = WCN36XX_DXE_WQ_TX_L; + break; + case WCN36XX_DXE_CH_TX_H: + cur_dxe->ctrl = WCN36XX_DXE_CTRL_TX_H; + cur_dxe->dst_addr_l = WCN36XX_DXE_WQ_TX_H; + break; + case WCN36XX_DXE_CH_RX_L: + cur_dxe->ctrl = WCN36XX_DXE_CTRL_RX_L; + cur_dxe->src_addr_l = WCN36XX_DXE_WQ_RX_L; + break; + case WCN36XX_DXE_CH_RX_H: + cur_dxe->ctrl = WCN36XX_DXE_CTRL_RX_H; + cur_dxe->src_addr_l = WCN36XX_DXE_WQ_RX_H; + break; + } + if (0 == i) { + cur_dxe->phy_next_l = 0; + } else if ((0 < i) && (i < wcn_ch->desc_num - 1)) { + prev_dxe->phy_next_l = + cur_ctl->desc_phy_addr; + } else if (i == (wcn_ch->desc_num - 1)) { + prev_dxe->phy_next_l = + cur_ctl->desc_phy_addr; + cur_dxe->phy_next_l = + wcn_ch->head_blk_ctl->desc_phy_addr; + } + cur_ctl = cur_ctl->next; + prev_dxe = cur_dxe; + cur_dxe++; + } + + return 0; +} + +static void wcn36xx_dxe_init_tx_bd(struct wcn36xx_dxe_ch *ch, + struct wcn36xx_dxe_mem_pool *pool) +{ + int i, chunk_size = pool->chunk_size; + dma_addr_t bd_phy_addr = pool->phy_addr; + void *bd_cpu_addr = pool->virt_addr; + struct wcn36xx_dxe_ctl *cur = ch->head_blk_ctl; + + for (i = 0; i < ch->desc_num; i++) { + /* Only every second dxe needs a bd pointer, + the other will point to the skb data */ + if (!(i & 1)) { + cur->bd_phy_addr = bd_phy_addr; + cur->bd_cpu_addr = bd_cpu_addr; + bd_phy_addr += chunk_size; + bd_cpu_addr += chunk_size; + } else { + cur->bd_phy_addr = 0; + cur->bd_cpu_addr = NULL; + } + cur = cur->next; + } +} + +static int wcn36xx_dxe_enable_ch_int(struct wcn36xx *wcn, u16 wcn_ch) +{ + int reg_data = 0; + + wcn36xx_dxe_read_register(wcn, + WCN36XX_DXE_INT_MASK_REG, + ®_data); + + reg_data |= wcn_ch; + + wcn36xx_dxe_write_register(wcn, + WCN36XX_DXE_INT_MASK_REG, + (int)reg_data); + return 0; +} + +static int wcn36xx_dxe_fill_skb(struct wcn36xx_dxe_ctl *ctl) +{ + struct wcn36xx_dxe_desc *dxe = ctl->desc; + struct sk_buff *skb; + + skb = alloc_skb(WCN36XX_PKT_SIZE, GFP_ATOMIC); + if (skb == NULL) + return -ENOMEM; + + dxe->dst_addr_l = dma_map_single(NULL, + skb_tail_pointer(skb), + WCN36XX_PKT_SIZE, + DMA_FROM_DEVICE); + ctl->skb = skb; + + return 0; +} + +static int wcn36xx_dxe_ch_alloc_skb(struct wcn36xx *wcn, + struct wcn36xx_dxe_ch *wcn_ch) +{ + int i; + struct wcn36xx_dxe_ctl *cur_ctl = NULL; + + cur_ctl = wcn_ch->head_blk_ctl; + + for (i = 0; i < wcn_ch->desc_num; i++) { + wcn36xx_dxe_fill_skb(cur_ctl); + cur_ctl = cur_ctl->next; + } + + return 0; +} + +static void wcn36xx_dxe_ch_free_skbs(struct wcn36xx *wcn, + struct wcn36xx_dxe_ch *wcn_ch) +{ + struct wcn36xx_dxe_ctl *cur = wcn_ch->head_blk_ctl; + int i; + + for (i = 0; i < wcn_ch->desc_num; i++) { + kfree_skb(cur->skb); + cur = cur->next; + } +} + +void wcn36xx_dxe_tx_ack_ind(struct wcn36xx *wcn, u32 status) +{ + struct ieee80211_tx_info *info; + struct sk_buff *skb; + unsigned long flags; + + spin_lock_irqsave(&wcn->dxe_lock, flags); + skb = wcn->tx_ack_skb; + wcn->tx_ack_skb = NULL; + spin_unlock_irqrestore(&wcn->dxe_lock, flags); + + if (!skb) { + wcn36xx_warn("Spurious TX complete indication\n"); + return; + } + + info = IEEE80211_SKB_CB(skb); + + if (status == 1) + info->flags |= IEEE80211_TX_STAT_ACK; + + wcn36xx_dbg(WCN36XX_DBG_DXE, "dxe tx ack status: %d\n", status); + + ieee80211_tx_status_irqsafe(wcn->hw, skb); + ieee80211_wake_queues(wcn->hw); +} + +static void reap_tx_dxes(struct wcn36xx *wcn, struct wcn36xx_dxe_ch *ch) +{ + struct wcn36xx_dxe_ctl *ctl = ch->tail_blk_ctl; + struct ieee80211_tx_info *info; + unsigned long flags; + + /* + * Make at least one loop of do-while because in case ring is + * completely full head and tail are pointing to the same element + * and while-do will not make any cycles. + */ + do { + if (ctl->desc->ctrl & WCN36XX_DXE_CTRL_VALID_MASK) + break; + if (ctl->skb) { + dma_unmap_single(NULL, ctl->desc->src_addr_l, + ctl->skb->len, DMA_TO_DEVICE); + info = IEEE80211_SKB_CB(ctl->skb); + if (!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS)) { + /* Keep frame until TX status comes */ + ieee80211_free_txskb(wcn->hw, ctl->skb); + } + spin_lock_irqsave(&ctl->skb_lock, flags); + if (wcn->queues_stopped) { + wcn->queues_stopped = false; + ieee80211_wake_queues(wcn->hw); + } + spin_unlock_irqrestore(&ctl->skb_lock, flags); + + ctl->skb = NULL; + } + ctl = ctl->next; + } while (ctl != ch->head_blk_ctl && + !(ctl->desc->ctrl & WCN36XX_DXE_CTRL_VALID_MASK)); + + ch->tail_blk_ctl = ctl; +} + +static irqreturn_t wcn36xx_irq_tx_complete(int irq, void *dev) +{ + struct wcn36xx *wcn = (struct wcn36xx *)dev; + int int_src, int_reason; + + wcn36xx_dxe_read_register(wcn, WCN36XX_DXE_INT_SRC_RAW_REG, &int_src); + + if (int_src & WCN36XX_INT_MASK_CHAN_TX_H) { + wcn36xx_dxe_read_register(wcn, + WCN36XX_DXE_CH_STATUS_REG_ADDR_TX_H, + &int_reason); + + /* TODO: Check int_reason */ + + wcn36xx_dxe_write_register(wcn, + WCN36XX_DXE_0_INT_CLR, + WCN36XX_INT_MASK_CHAN_TX_H); + + wcn36xx_dxe_write_register(wcn, WCN36XX_DXE_0_INT_ED_CLR, + WCN36XX_INT_MASK_CHAN_TX_H); + wcn36xx_dbg(WCN36XX_DBG_DXE, "dxe tx ready high\n"); + reap_tx_dxes(wcn, &wcn->dxe_tx_h_ch); + } + + if (int_src & WCN36XX_INT_MASK_CHAN_TX_L) { + wcn36xx_dxe_read_register(wcn, + WCN36XX_DXE_CH_STATUS_REG_ADDR_TX_L, + &int_reason); + /* TODO: Check int_reason */ + + wcn36xx_dxe_write_register(wcn, + WCN36XX_DXE_0_INT_CLR, + WCN36XX_INT_MASK_CHAN_TX_L); + + wcn36xx_dxe_write_register(wcn, WCN36XX_DXE_0_INT_ED_CLR, + WCN36XX_INT_MASK_CHAN_TX_L); + wcn36xx_dbg(WCN36XX_DBG_DXE, "dxe tx ready low\n"); + reap_tx_dxes(wcn, &wcn->dxe_tx_l_ch); + } + + return IRQ_HANDLED; +} + +static irqreturn_t wcn36xx_irq_rx_ready(int irq, void *dev) +{ + struct wcn36xx *wcn = (struct wcn36xx *)dev; + + disable_irq_nosync(wcn->rx_irq); + wcn36xx_dxe_rx_frame(wcn); + enable_irq(wcn->rx_irq); + return IRQ_HANDLED; +} + +static int wcn36xx_dxe_request_irqs(struct wcn36xx *wcn) +{ + int ret; + + ret = request_irq(wcn->tx_irq, wcn36xx_irq_tx_complete, + IRQF_TRIGGER_HIGH, "wcn36xx_tx", wcn); + if (ret) { + wcn36xx_err("failed to alloc tx irq\n"); + goto out_err; + } + + ret = request_irq(wcn->rx_irq, wcn36xx_irq_rx_ready, IRQF_TRIGGER_HIGH, + "wcn36xx_rx", wcn); + if (ret) { + wcn36xx_err("failed to alloc rx irq\n"); + goto out_txirq; + } + + enable_irq_wake(wcn->rx_irq); + + return 0; + +out_txirq: + free_irq(wcn->tx_irq, wcn); +out_err: + return ret; + +} + +static int wcn36xx_rx_handle_packets(struct wcn36xx *wcn, + struct wcn36xx_dxe_ch *ch) +{ + struct wcn36xx_dxe_ctl *ctl = ch->head_blk_ctl; + struct wcn36xx_dxe_desc *dxe = ctl->desc; + dma_addr_t dma_addr; + struct sk_buff *skb; + + while (!(dxe->ctrl & WCN36XX_DXE_CTRL_VALID_MASK)) { + skb = ctl->skb; + dma_addr = dxe->dst_addr_l; + wcn36xx_dxe_fill_skb(ctl); + + switch (ch->ch_type) { + case WCN36XX_DXE_CH_RX_L: + dxe->ctrl = WCN36XX_DXE_CTRL_RX_L; + wcn36xx_dxe_write_register(wcn, WCN36XX_DXE_ENCH_ADDR, + WCN36XX_DXE_INT_CH1_MASK); + break; + case WCN36XX_DXE_CH_RX_H: + dxe->ctrl = WCN36XX_DXE_CTRL_RX_H; + wcn36xx_dxe_write_register(wcn, WCN36XX_DXE_ENCH_ADDR, + WCN36XX_DXE_INT_CH3_MASK); + break; + default: + wcn36xx_warn("Unknown channel\n"); + } + + dma_unmap_single(NULL, dma_addr, WCN36XX_PKT_SIZE, + DMA_FROM_DEVICE); + wcn36xx_rx_skb(wcn, skb); + ctl = ctl->next; + dxe = ctl->desc; + } + + ch->head_blk_ctl = ctl; + + return 0; +} + +void wcn36xx_dxe_rx_frame(struct wcn36xx *wcn) +{ + int int_src; + + wcn36xx_dxe_read_register(wcn, WCN36XX_DXE_INT_SRC_RAW_REG, &int_src); + + /* RX_LOW_PRI */ + if (int_src & WCN36XX_DXE_INT_CH1_MASK) { + wcn36xx_dxe_write_register(wcn, WCN36XX_DXE_0_INT_CLR, + WCN36XX_DXE_INT_CH1_MASK); + wcn36xx_rx_handle_packets(wcn, &(wcn->dxe_rx_l_ch)); + } + + /* RX_HIGH_PRI */ + if (int_src & WCN36XX_DXE_INT_CH3_MASK) { + /* Clean up all the INT within this channel */ + wcn36xx_dxe_write_register(wcn, WCN36XX_DXE_0_INT_CLR, + WCN36XX_DXE_INT_CH3_MASK); + wcn36xx_rx_handle_packets(wcn, &(wcn->dxe_rx_h_ch)); + } + + if (!int_src) + wcn36xx_warn("No DXE interrupt pending\n"); +} + +int wcn36xx_dxe_allocate_mem_pools(struct wcn36xx *wcn) +{ + size_t s; + void *cpu_addr; + + /* Allocate BD headers for MGMT frames */ + + /* Where this come from ask QC */ + wcn->mgmt_mem_pool.chunk_size = WCN36XX_BD_CHUNK_SIZE + + 16 - (WCN36XX_BD_CHUNK_SIZE % 8); + + s = wcn->mgmt_mem_pool.chunk_size * WCN36XX_DXE_CH_DESC_NUMB_TX_H; + cpu_addr = dma_alloc_coherent(NULL, s, &wcn->mgmt_mem_pool.phy_addr, + GFP_KERNEL); + if (!cpu_addr) + goto out_err; + + wcn->mgmt_mem_pool.virt_addr = cpu_addr; + memset(cpu_addr, 0, s); + + /* Allocate BD headers for DATA frames */ + + /* Where this come from ask QC */ + wcn->data_mem_pool.chunk_size = WCN36XX_BD_CHUNK_SIZE + + 16 - (WCN36XX_BD_CHUNK_SIZE % 8); + + s = wcn->data_mem_pool.chunk_size * WCN36XX_DXE_CH_DESC_NUMB_TX_L; + cpu_addr = dma_alloc_coherent(NULL, s, &wcn->data_mem_pool.phy_addr, + GFP_KERNEL); + if (!cpu_addr) + goto out_err; + + wcn->data_mem_pool.virt_addr = cpu_addr; + memset(cpu_addr, 0, s); + + return 0; + +out_err: + wcn36xx_dxe_free_mem_pools(wcn); + wcn36xx_err("Failed to allocate BD mempool\n"); + return -ENOMEM; +} + +void wcn36xx_dxe_free_mem_pools(struct wcn36xx *wcn) +{ + if (wcn->mgmt_mem_pool.virt_addr) + dma_free_coherent(NULL, wcn->mgmt_mem_pool.chunk_size * + WCN36XX_DXE_CH_DESC_NUMB_TX_H, + wcn->mgmt_mem_pool.virt_addr, + wcn->mgmt_mem_pool.phy_addr); + + if (wcn->data_mem_pool.virt_addr) { + dma_free_coherent(NULL, wcn->data_mem_pool.chunk_size * + WCN36XX_DXE_CH_DESC_NUMB_TX_L, + wcn->data_mem_pool.virt_addr, + wcn->data_mem_pool.phy_addr); + } +} + +int wcn36xx_dxe_tx_frame(struct wcn36xx *wcn, + struct wcn36xx_vif *vif_priv, + struct sk_buff *skb, + bool is_low) +{ + struct wcn36xx_dxe_ctl *ctl = NULL; + struct wcn36xx_dxe_desc *desc = NULL; + struct wcn36xx_dxe_ch *ch = NULL; + unsigned long flags; + + ch = is_low ? &wcn->dxe_tx_l_ch : &wcn->dxe_tx_h_ch; + + ctl = ch->head_blk_ctl; + + spin_lock_irqsave(&ctl->next->skb_lock, flags); + + /* + * If skb is not null that means that we reached the tail of the ring + * hence ring is full. Stop queues to let mac80211 back off until ring + * has an empty slot again. + */ + if (NULL != ctl->next->skb) { + ieee80211_stop_queues(wcn->hw); + wcn->queues_stopped = true; + spin_unlock_irqrestore(&ctl->next->skb_lock, flags); + return -EBUSY; + } + spin_unlock_irqrestore(&ctl->next->skb_lock, flags); + + ctl->skb = NULL; + desc = ctl->desc; + + /* Set source address of the BD we send */ + desc->src_addr_l = ctl->bd_phy_addr; + + desc->dst_addr_l = ch->dxe_wq; + desc->fr_len = sizeof(struct wcn36xx_tx_bd); + desc->ctrl = ch->ctrl_bd; + + wcn36xx_dbg(WCN36XX_DBG_DXE, "DXE TX\n"); + + wcn36xx_dbg_dump(WCN36XX_DBG_DXE_DUMP, "DESC1 >>> ", + (char *)desc, sizeof(*desc)); + wcn36xx_dbg_dump(WCN36XX_DBG_DXE_DUMP, + "BD >>> ", (char *)ctl->bd_cpu_addr, + sizeof(struct wcn36xx_tx_bd)); + + /* Set source address of the SKB we send */ + ctl = ctl->next; + ctl->skb = skb; + desc = ctl->desc; + if (ctl->bd_cpu_addr) { + wcn36xx_err("bd_cpu_addr cannot be NULL for skb DXE\n"); + return -EINVAL; + } + + desc->src_addr_l = dma_map_single(NULL, + ctl->skb->data, + ctl->skb->len, + DMA_TO_DEVICE); + + desc->dst_addr_l = ch->dxe_wq; + desc->fr_len = ctl->skb->len; + + /* set dxe descriptor to VALID */ + desc->ctrl = ch->ctrl_skb; + + wcn36xx_dbg_dump(WCN36XX_DBG_DXE_DUMP, "DESC2 >>> ", + (char *)desc, sizeof(*desc)); + wcn36xx_dbg_dump(WCN36XX_DBG_DXE_DUMP, "SKB >>> ", + (char *)ctl->skb->data, ctl->skb->len); + + /* Move the head of the ring to the next empty descriptor */ + ch->head_blk_ctl = ctl->next; + + /* + * When connected and trying to send data frame chip can be in sleep + * mode and writing to the register will not wake up the chip. Instead + * notify chip about new frame through SMSM bus. + */ + if (is_low && vif_priv->pw_state == WCN36XX_BMPS) { + wcn->ctrl_ops->smsm_change_state( + 0, + WCN36XX_SMSM_WLAN_TX_ENABLE); + } else { + /* indicate End Of Packet and generate interrupt on descriptor + * done. + */ + wcn36xx_dxe_write_register(wcn, + ch->reg_ctrl, ch->def_ctrl); + } + + return 0; +} + +int wcn36xx_dxe_init(struct wcn36xx *wcn) +{ + int reg_data = 0, ret; + + reg_data = WCN36XX_DXE_REG_RESET; + wcn36xx_dxe_write_register(wcn, WCN36XX_DXE_REG_CSR_RESET, reg_data); + + /* Setting interrupt path */ + reg_data = WCN36XX_DXE_CCU_INT; + wcn36xx_dxe_write_register_x(wcn, WCN36XX_DXE_REG_CCU_INT, reg_data); + + /***************************************/ + /* Init descriptors for TX LOW channel */ + /***************************************/ + wcn36xx_dxe_init_descs(&wcn->dxe_tx_l_ch); + wcn36xx_dxe_init_tx_bd(&wcn->dxe_tx_l_ch, &wcn->data_mem_pool); + + /* Write channel head to a NEXT register */ + wcn36xx_dxe_write_register(wcn, WCN36XX_DXE_CH_NEXT_DESC_ADDR_TX_L, + wcn->dxe_tx_l_ch.head_blk_ctl->desc_phy_addr); + + /* Program DMA destination addr for TX LOW */ + wcn36xx_dxe_write_register(wcn, + WCN36XX_DXE_CH_DEST_ADDR_TX_L, + WCN36XX_DXE_WQ_TX_L); + + wcn36xx_dxe_read_register(wcn, WCN36XX_DXE_REG_CH_EN, ®_data); + wcn36xx_dxe_enable_ch_int(wcn, WCN36XX_INT_MASK_CHAN_TX_L); + + /***************************************/ + /* Init descriptors for TX HIGH channel */ + /***************************************/ + wcn36xx_dxe_init_descs(&wcn->dxe_tx_h_ch); + wcn36xx_dxe_init_tx_bd(&wcn->dxe_tx_h_ch, &wcn->mgmt_mem_pool); + + /* Write channel head to a NEXT register */ + wcn36xx_dxe_write_register(wcn, WCN36XX_DXE_CH_NEXT_DESC_ADDR_TX_H, + wcn->dxe_tx_h_ch.head_blk_ctl->desc_phy_addr); + + /* Program DMA destination addr for TX HIGH */ + wcn36xx_dxe_write_register(wcn, + WCN36XX_DXE_CH_DEST_ADDR_TX_H, + WCN36XX_DXE_WQ_TX_H); + + wcn36xx_dxe_read_register(wcn, WCN36XX_DXE_REG_CH_EN, ®_data); + + /* Enable channel interrupts */ + wcn36xx_dxe_enable_ch_int(wcn, WCN36XX_INT_MASK_CHAN_TX_H); + + /***************************************/ + /* Init descriptors for RX LOW channel */ + /***************************************/ + wcn36xx_dxe_init_descs(&wcn->dxe_rx_l_ch); + + /* For RX we need to preallocated buffers */ + wcn36xx_dxe_ch_alloc_skb(wcn, &wcn->dxe_rx_l_ch); + + /* Write channel head to a NEXT register */ + wcn36xx_dxe_write_register(wcn, WCN36XX_DXE_CH_NEXT_DESC_ADDR_RX_L, + wcn->dxe_rx_l_ch.head_blk_ctl->desc_phy_addr); + + /* Write DMA source address */ + wcn36xx_dxe_write_register(wcn, + WCN36XX_DXE_CH_SRC_ADDR_RX_L, + WCN36XX_DXE_WQ_RX_L); + + /* Program preallocated destination address */ + wcn36xx_dxe_write_register(wcn, + WCN36XX_DXE_CH_DEST_ADDR_RX_L, + wcn->dxe_rx_l_ch.head_blk_ctl->desc->phy_next_l); + + /* Enable default control registers */ + wcn36xx_dxe_write_register(wcn, + WCN36XX_DXE_REG_CTL_RX_L, + WCN36XX_DXE_CH_DEFAULT_CTL_RX_L); + + /* Enable channel interrupts */ + wcn36xx_dxe_enable_ch_int(wcn, WCN36XX_INT_MASK_CHAN_RX_L); + + /***************************************/ + /* Init descriptors for RX HIGH channel */ + /***************************************/ + wcn36xx_dxe_init_descs(&wcn->dxe_rx_h_ch); + + /* For RX we need to prealocat buffers */ + wcn36xx_dxe_ch_alloc_skb(wcn, &wcn->dxe_rx_h_ch); + + /* Write chanel head to a NEXT register */ + wcn36xx_dxe_write_register(wcn, WCN36XX_DXE_CH_NEXT_DESC_ADDR_RX_H, + wcn->dxe_rx_h_ch.head_blk_ctl->desc_phy_addr); + + /* Write DMA source address */ + wcn36xx_dxe_write_register(wcn, + WCN36XX_DXE_CH_SRC_ADDR_RX_H, + WCN36XX_DXE_WQ_RX_H); + + /* Program preallocated destination address */ + wcn36xx_dxe_write_register(wcn, + WCN36XX_DXE_CH_DEST_ADDR_RX_H, + wcn->dxe_rx_h_ch.head_blk_ctl->desc->phy_next_l); + + /* Enable default control registers */ + wcn36xx_dxe_write_register(wcn, + WCN36XX_DXE_REG_CTL_RX_H, + WCN36XX_DXE_CH_DEFAULT_CTL_RX_H); + + /* Enable channel interrupts */ + wcn36xx_dxe_enable_ch_int(wcn, WCN36XX_INT_MASK_CHAN_RX_H); + + ret = wcn36xx_dxe_request_irqs(wcn); + if (ret < 0) + goto out_err; + + return 0; + +out_err: + return ret; +} + +void wcn36xx_dxe_deinit(struct wcn36xx *wcn) +{ + free_irq(wcn->tx_irq, wcn); + free_irq(wcn->rx_irq, wcn); + + if (wcn->tx_ack_skb) { + ieee80211_tx_status_irqsafe(wcn->hw, wcn->tx_ack_skb); + wcn->tx_ack_skb = NULL; + } + + wcn36xx_dxe_ch_free_skbs(wcn, &wcn->dxe_rx_l_ch); + wcn36xx_dxe_ch_free_skbs(wcn, &wcn->dxe_rx_h_ch); +} |