Merge branch 'mediatek-bring-up-QDMA-RX-ring-0'

John Crispin says:

====================
net-next: mediatek: bring up QDMA RX ring 0

The MT7623 has several DMA rings. Inside the SW path, the core will use
the PDMA when receiving traffic. While bringing up the HW path we noticed
that the PPE requires the QDMA RX to also be brought up as it uses this
ring internally for its flow scheduling.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 31 insertions, 12 deletions

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index acf2b3b..5e81a72 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -1285,9 +1285,19 @@ static void mtk_tx_clean(struct mtk_eth *eth)
 
 static int mtk_rx_alloc(struct mtk_eth *eth, int ring_no, int rx_flag)
 {
-	struct mtk_rx_ring *ring = &eth->rx_ring[ring_no];
+	struct mtk_rx_ring *ring;
 	int rx_data_len, rx_dma_size;
 	int i;
+	u32 offset = 0;
+
+	if (rx_flag == MTK_RX_FLAGS_QDMA) {
+		if (ring_no)
+			return -EINVAL;
+		ring = &eth->rx_ring_qdma;
+		offset = 0x1000;
+	} else {
+		ring = &eth->rx_ring[ring_no];
+	}
 
 	if (rx_flag == MTK_RX_FLAGS_HWLRO) {
 		rx_data_len = MTK_MAX_LRO_RX_LENGTH;
@@ -1337,17 +1347,16 @@ static int mtk_rx_alloc(struct mtk_eth *eth, int ring_no, int rx_flag)
 	 */
 	wmb();
 
-	mtk_w32(eth, ring->phys, MTK_PRX_BASE_PTR_CFG(ring_no));
-	mtk_w32(eth, rx_dma_size, MTK_PRX_MAX_CNT_CFG(ring_no));
-	mtk_w32(eth, ring->calc_idx, ring->crx_idx_reg);
-	mtk_w32(eth, MTK_PST_DRX_IDX_CFG(ring_no), MTK_PDMA_RST_IDX);
+	mtk_w32(eth, ring->phys, MTK_PRX_BASE_PTR_CFG(ring_no) + offset);
+	mtk_w32(eth, rx_dma_size, MTK_PRX_MAX_CNT_CFG(ring_no) + offset);
+	mtk_w32(eth, ring->calc_idx, ring->crx_idx_reg + offset);
+	mtk_w32(eth, MTK_PST_DRX_IDX_CFG(ring_no), MTK_PDMA_RST_IDX + offset);
 
 	return 0;
 }
 
-static void mtk_rx_clean(struct mtk_eth *eth, int ring_no)
+static void mtk_rx_clean(struct mtk_eth *eth, struct mtk_rx_ring *ring)
 {
-	struct mtk_rx_ring *ring = &eth->rx_ring[ring_no];
 	int i;
 
 	if (ring->data && ring->dma) {
@@ -1673,6 +1682,10 @@ static int mtk_dma_init(struct mtk_eth *eth)
 	if (err)
 		return err;
 
+	err = mtk_rx_alloc(eth, 0, MTK_RX_FLAGS_QDMA);
+	if (err)
+		return err;
+
 	err = mtk_rx_alloc(eth, 0, MTK_RX_FLAGS_NORMAL);
 	if (err)
 		return err;
@@ -1712,12 +1725,13 @@ static void mtk_dma_free(struct mtk_eth *eth)
 		eth->phy_scratch_ring = 0;
 	}
 	mtk_tx_clean(eth);
-	mtk_rx_clean(eth, 0);
+	mtk_rx_clean(eth, &eth->rx_ring[0]);
+	mtk_rx_clean(eth, &eth->rx_ring_qdma);
 
 	if (eth->hwlro) {
 		mtk_hwlro_rx_uninit(eth);
 		for (i = 1; i < MTK_MAX_RX_RING_NUM; i++)
-			mtk_rx_clean(eth, i);
+			mtk_rx_clean(eth, &eth->rx_ring[i]);
 	}
 
 	kfree(eth->scratch_head);
@@ -1784,7 +1798,9 @@ static int mtk_start_dma(struct mtk_eth *eth)
 
 	mtk_w32(eth,
 		MTK_TX_WB_DDONE | MTK_TX_DMA_EN |
-		MTK_DMA_SIZE_16DWORDS | MTK_NDP_CO_PRO,
+		MTK_DMA_SIZE_16DWORDS | MTK_NDP_CO_PRO |
+		MTK_RX_DMA_EN | MTK_RX_2B_OFFSET |
+		MTK_RX_BT_32DWORDS,
 		MTK_QDMA_GLO_CFG);
 
 	mtk_w32(eth,
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.h b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
index 4594862..3d3c24a 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
@@ -532,6 +532,7 @@ struct mtk_tx_ring {
 enum mtk_rx_flags {
 	MTK_RX_FLAGS_NORMAL = 0,
 	MTK_RX_FLAGS_HWLRO,
+	MTK_RX_FLAGS_QDMA,
 };
 
 /* struct mtk_rx_ring -	This struct holds info describing a RX ring
@@ -599,8 +600,9 @@ struct mtk_soc_data {
  * @pctl:		The register map pointing at the range used to setup
  *			GMAC port drive/slew values
  * @dma_refcnt:		track how many netdevs are using the DMA engine
- * @tx_ring:		Pointer to the memore holding info about the TX ring
- * @rx_ring:		Pointer to the memore holding info about the RX ring
+ * @tx_ring:		Pointer to the memory holding info about the TX ring
+ * @rx_ring:		Pointer to the memory holding info about the RX ring
+ * @rx_ring_qdma:	Pointer to the memory holding info about the QDMA RX ring
  * @tx_napi:		The TX NAPI struct
  * @rx_napi:		The RX NAPI struct
  * @scratch_ring:	Newer SoCs need memory for a second HW managed TX ring
@@ -633,6 +635,7 @@ struct mtk_eth {
 	atomic_t			dma_refcnt;
 	struct mtk_tx_ring		tx_ring;
 	struct mtk_rx_ring		rx_ring[MTK_MAX_RX_RING_NUM];
+	struct mtk_rx_ring		rx_ring_qdma;
 	struct napi_struct		tx_napi;
 	struct napi_struct		rx_napi;
 	struct mtk_tx_dma		*scratch_ring;