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wifi: mt76: mt792x: factor out common DMA queue allocation

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The mt792x PCIe DMA setup uses the same standard queue allocation
sequence for data, MCU, firmware download and RX rings.

Factor this part out into a small common helper so later chip support
can reuse the existing flow without duplicating the queue setup logic.

This keeps the common DMA skeleton in one place and makes follow-up
chip-specific DMA changes smaller and easier to review.

Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Link: https://patch.msgid.link/20260425195011.790265-15-sean.wang@kernel.org
Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Sean Wang 2026-04-25 14:50:04 -05:00 committed by Felix Fietkau
parent c08ffdaf32
commit 1e570aa871
2 changed files with 75 additions and 0 deletions
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19
drivers/net/wireless/mediatek/mt76/mt792x.h
View File

@ -206,6 +206,23 @@ struct mt792x_irq_map {
} rx;
};
struct mt792x_dma_ring {
u8 qid;
u16 n_desc;
u32 ring_base;
};
struct mt792x_dma_layout {
struct mt792x_dma_ring tx_data0;
struct mt792x_dma_ring tx_mcu;
struct mt792x_dma_ring tx_fwdl;
struct mt792x_dma_ring rx_data;
struct mt792x_dma_ring rx_mcu;
};
#define mt792x_dma_ring(_qid, _n_desc, _ring_base) \
{ .qid = (_qid), .n_desc = (_n_desc), .ring_base = (_ring_base) }
#define mt792x_init_reset(dev) ((dev)->hif_ops->init_reset(dev))
#define mt792x_dev_reset(dev) ((dev)->hif_ops->reset(dev))
#define mt792x_mcu_init(dev) ((dev)->hif_ops->mcu_init(dev))
@ -421,6 +438,8 @@ void mt792x_sta_statistics(struct ieee80211_hw *hw,
void mt792x_set_coverage_class(struct ieee80211_hw *hw, int radio_idx,
s16 coverage_class);
void mt792x_dma_cleanup(struct mt792x_dev *dev);
int mt792x_dma_alloc_queues(struct mt792x_dev *dev,
const struct mt792x_dma_layout *layout);
int mt792x_dma_enable(struct mt792x_dev *dev);
int mt792x_wpdma_reset(struct mt792x_dev *dev, bool force);
int mt792x_wpdma_reinit_cond(struct mt792x_dev *dev);

56
drivers/net/wireless/mediatek/mt76/mt792x_dma.c
View File

@ -87,6 +87,62 @@ void mt792x_rx_poll_complete(struct mt76_dev *mdev, enum mt76_rxq_id q)
}
EXPORT_SYMBOL_GPL(mt792x_rx_poll_complete);
int mt792x_dma_alloc_queues(struct mt792x_dev *dev,
const struct mt792x_dma_layout *layout)
{
int ret;
mt76_dma_attach(&dev->mt76);
ret = mt792x_dma_disable(dev, true);
if (ret)
return ret;
/* init tx queue */
ret = mt76_connac_init_tx_queues(dev->phy.mt76, layout->tx_data0.qid,
layout->tx_data0.n_desc,
layout->tx_data0.ring_base,
NULL, 0);
if (ret)
return ret;
mt76_wr(dev, MT_WFDMA0_TX_RING0_EXT_CTRL, 0x4);
/* command to WM */
ret = mt76_init_mcu_queue(&dev->mt76, MT_MCUQ_WM,
layout->tx_mcu.qid,
layout->tx_mcu.n_desc,
layout->tx_mcu.ring_base);
if (ret)
return ret;
/* firmware download */
ret = mt76_init_mcu_queue(&dev->mt76, MT_MCUQ_FWDL,
layout->tx_fwdl.qid,
layout->tx_fwdl.n_desc,
layout->tx_fwdl.ring_base);
if (ret)
return ret;
/* rx event */
ret = mt76_queue_alloc(dev, &dev->mt76.q_rx[MT_RXQ_MCU],
layout->rx_mcu.qid,
layout->rx_mcu.n_desc,
MT_RX_BUF_SIZE,
layout->rx_mcu.ring_base);
if (ret)
return ret;
/* rx data */
ret = mt76_queue_alloc(dev, &dev->mt76.q_rx[MT_RXQ_MAIN],
layout->rx_data.qid,
layout->rx_data.n_desc,
MT_RX_BUF_SIZE,
layout->rx_data.ring_base);
return ret;
}
EXPORT_SYMBOL_GPL(mt792x_dma_alloc_queues);
#define PREFETCH(base, depth) ((base) << 16 | (depth))
static void mt792x_dma_prefetch(struct mt792x_dev *dev)
{