From: Jitendra Vegiraju <jitendra.vegiraju@xxxxxxxxxxxx>
Add hdma configuration support in include/linux/stmmac.h file.
The hdma configuration includes mapping of virtual DMAs to physical DMAs.
Define a new data structure stmmac_hdma_cfg to provide the mapping.
Signed-off-by: Jitendra Vegiraju <jitendra.vegiraju@xxxxxxxxxxxx>
---
include/linux/stmmac.h | 50 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 50 insertions(+)
diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index 338991c08f00..1775bd2b7c14 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -89,6 +89,55 @@ struct stmmac_mdio_bus_data {
bool needs_reset;
};
+/* DW25GMAC Hyper-DMA Overview
+ * Hyper-DMA allows support for large number of Virtual DMA(VDMA)
+ * channels using a smaller set of physical DMA channels(PDMA).
+ * This is supported by the mapping of VDMAs to Traffic Class (TC)
+ * and PDMA to TC in each traffic direction as shown below.
+ *
+ * VDMAs Traffic Class PDMA
+ * +--------+ +------+ +-----------+
+ * |VDMA0 |--------->| TC0 |-------->|PDMA0/TXQ0 |
+ *TX +--------+ |----->+------+ +-----------+
+ *Host=> +--------+ | +------+ +-----------+ => MAC
+ *SW |VDMA1 |---+ | TC1 | +--->|PDMA1/TXQ1 |
+ * +--------+ +------+ | +-----------+
+ * +--------+ +------+----+ +-----------+
+ * |VDMA2 |--------->| TC2 |-------->|PDMA2/TXQ1 |
+ * +--------+ +------+ +-----------+
+ * . . .
+ * +--------+ +------+ +-----------+
+ * |VDMAn-1 |--------->| TCx-1|-------->|PDMAm/TXQm |
+ * +--------+ +------+ +-----------+
+ *
+ * +------+ +------+ +------+
+ * |PDMA0 |--------->| TC0 |-------->|VDMA0 |
+ * +------+ |----->+------+ +------+
+ *MAC => +------+ | +------+ +------+
+ *RXQs |PDMA1 |---+ | TC1 | +--->|VDMA1 | => Host
+ * +------+ +------+ | +------+
+ * . . .
+ */
+
+#define STMMAC_DW25GMAC_MAX_NUM_TX_VDMA 128
+#define STMMAC_DW25GMAC_MAX_NUM_RX_VDMA 128
+
+#define STMMAC_DW25GMAC_MAX_NUM_TX_PDMA 8
+#define STMMAC_DW25GMAC_MAX_NUM_RX_PDMA 10
+
+#define STMMAC_DW25GMAC_MAX_TC 8
+
+/* Hyper-DMA mapping configuration
+ * Traffic Class associated with each VDMA/PDMA mapping
+ * is stored in corresponding array entry.
+ */
+struct stmmac_hdma_cfg {
+ u8 tvdma_tc[STMMAC_DW25GMAC_MAX_NUM_TX_VDMA];
+ u8 rvdma_tc[STMMAC_DW25GMAC_MAX_NUM_RX_VDMA];
+ u8 tpdma_tc[STMMAC_DW25GMAC_MAX_NUM_TX_PDMA];
+ u8 rpdma_tc[STMMAC_DW25GMAC_MAX_NUM_RX_PDMA];
+};
+
struct stmmac_dma_cfg {
int pbl;
int txpbl;
@@ -101,6 +150,7 @@ struct stmmac_dma_cfg {
bool multi_msi_en;
bool dche;
bool atds;
+ struct stmmac_hdma_cfg *hdma_cfg;
};
#define AXI_BLEN 7
--
2.34.1
