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[net-next,4/6] net: ethernet: ti: am65-cpsw-nuss: Support for transparent ASEL handling

Message ID 20210115192853.5469-5-grygorii.strashko@ti.com
State New
Headers show
Series net: ethernet: ti: am65-cpsw-nuss: introduce support for am64x cpsw3g | expand

Commit Message

Grygorii Strashko Jan. 15, 2021, 7:28 p.m. UTC 
From: Peter Ujfalusi <peter.ujfalusi@ti.com>

Use the glue layer's functions to convert the dma_addr_t to and from CPPI5
address (with the ASEL bits), which should be used within the descriptors
and data buffers.

- Per channel coherency support
The DMAs use the 'ASEL' bits to select data and configuration fetch path.
The ASEL bits are placed at the unused parts of any address field used by
the DMAs (pointers to descriptors, addresses in descriptors, ring base
addresses). The ASEL is not part of the address (the DMAs can address
48bits). Individual channels can be configured to be coherent (via ACP
port) or non coherent individually by configuring the ASEL to appropriate
value.

[1] https://lore.kernel.org/patchwork/cover/1350756/
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Co-developed-by: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
---
 drivers/net/ethernet/ti/am65-cpsw-nuss.c | 10 ++++++++++
 1 file changed, 10 insertions(+)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index 8bf48cf3be9b..d060744dd0b2 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -376,6 +376,7 @@  static int am65_cpsw_nuss_rx_push(struct am65_cpsw_common *common,
 
 	cppi5_hdesc_init(desc_rx, CPPI5_INFO0_HDESC_EPIB_PRESENT,
 			 AM65_CPSW_NAV_PS_DATA_SIZE);
+	k3_udma_glue_rx_dma_to_cppi5_addr(rx_chn->rx_chn, &buf_dma);
 	cppi5_hdesc_attach_buf(desc_rx, buf_dma, skb_tailroom(skb), buf_dma, skb_tailroom(skb));
 	swdata = cppi5_hdesc_get_swdata(desc_rx);
 	*((void **)swdata) = skb;
@@ -692,6 +693,7 @@  static void am65_cpsw_nuss_rx_cleanup(void *data, dma_addr_t desc_dma)
 	swdata = cppi5_hdesc_get_swdata(desc_rx);
 	skb = *swdata;
 	cppi5_hdesc_get_obuf(desc_rx, &buf_dma, &buf_dma_len);
+	k3_udma_glue_rx_cppi5_to_dma_addr(rx_chn->rx_chn, &buf_dma);
 
 	dma_unmap_single(rx_chn->dma_dev, buf_dma, buf_dma_len, DMA_FROM_DEVICE);
 	k3_cppi_desc_pool_free(rx_chn->desc_pool, desc_rx);
@@ -780,6 +782,7 @@  static int am65_cpsw_nuss_rx_packets(struct am65_cpsw_common *common,
 	swdata = cppi5_hdesc_get_swdata(desc_rx);
 	skb = *swdata;
 	cppi5_hdesc_get_obuf(desc_rx, &buf_dma, &buf_dma_len);
+	k3_udma_glue_rx_cppi5_to_dma_addr(rx_chn->rx_chn, &buf_dma);
 	pkt_len = cppi5_hdesc_get_pktlen(desc_rx);
 	cppi5_desc_get_tags_ids(&desc_rx->hdr, &port_id, NULL);
 	dev_dbg(dev, "%s rx port_id:%d\n", __func__, port_id);
@@ -875,19 +878,23 @@  static void am65_cpsw_nuss_xmit_free(struct am65_cpsw_tx_chn *tx_chn,
 	next_desc = first_desc;
 
 	cppi5_hdesc_get_obuf(first_desc, &buf_dma, &buf_dma_len);
+	k3_udma_glue_tx_cppi5_to_dma_addr(tx_chn->tx_chn, &buf_dma);
 
 	dma_unmap_single(tx_chn->dma_dev, buf_dma, buf_dma_len, DMA_TO_DEVICE);
 
 	next_desc_dma = cppi5_hdesc_get_next_hbdesc(first_desc);
+	k3_udma_glue_tx_cppi5_to_dma_addr(tx_chn->tx_chn, &next_desc_dma);
 	while (next_desc_dma) {
 		next_desc = k3_cppi_desc_pool_dma2virt(tx_chn->desc_pool,
 						       next_desc_dma);
 		cppi5_hdesc_get_obuf(next_desc, &buf_dma, &buf_dma_len);
+		k3_udma_glue_tx_cppi5_to_dma_addr(tx_chn->tx_chn, &buf_dma);
 
 		dma_unmap_page(tx_chn->dma_dev, buf_dma, buf_dma_len,
 			       DMA_TO_DEVICE);
 
 		next_desc_dma = cppi5_hdesc_get_next_hbdesc(next_desc);
+		k3_udma_glue_tx_cppi5_to_dma_addr(tx_chn->tx_chn, &next_desc_dma);
 
 		k3_cppi_desc_pool_free(tx_chn->desc_pool, next_desc);
 	}
@@ -1140,6 +1147,7 @@  static netdev_tx_t am65_cpsw_nuss_ndo_slave_xmit(struct sk_buff *skb,
 	cppi5_hdesc_set_pkttype(first_desc, 0x7);
 	cppi5_desc_set_tags_ids(&first_desc->hdr, 0, port->port_id);
 
+	k3_udma_glue_tx_dma_to_cppi5_addr(tx_chn->tx_chn, &buf_dma);
 	cppi5_hdesc_attach_buf(first_desc, buf_dma, pkt_len, buf_dma, pkt_len);
 	swdata = cppi5_hdesc_get_swdata(first_desc);
 	*(swdata) = skb;
@@ -1185,11 +1193,13 @@  static netdev_tx_t am65_cpsw_nuss_ndo_slave_xmit(struct sk_buff *skb,
 		}
 
 		cppi5_hdesc_reset_hbdesc(next_desc);
+		k3_udma_glue_tx_dma_to_cppi5_addr(tx_chn->tx_chn, &buf_dma);
 		cppi5_hdesc_attach_buf(next_desc,
 				       buf_dma, frag_size, buf_dma, frag_size);
 
 		desc_dma = k3_cppi_desc_pool_virt2dma(tx_chn->desc_pool,
 						      next_desc);
+		k3_udma_glue_tx_dma_to_cppi5_addr(tx_chn->tx_chn, &desc_dma);
 		cppi5_hdesc_link_hbdesc(cur_desc, desc_dma);
 
 		pkt_len += frag_size;