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.
Introduce new plat_stmmacenet_data::snps_id,snps_dev_id to allow glue
drivers to specify synopsys ID and device id respectively.
These values take precedence over reading from HW register. This facility
provides a mechanism to use setup function from stmmac core module and yet
override MAC.VERSION CSR if the glue driver chooses to do so.
Signed-off-by: Jitendra Vegiraju <jitendra.vegiraju@xxxxxxxxxxxx>
---
include/linux/stmmac.h | 48 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 48 insertions(+)
diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index 338991c08f00..eb8136680a7b 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -89,6 +89,51 @@ 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
+ * +------+ +------+ | +------+
+ * . . .
+ */
+
+/* Hyper-DMA mapping configuration
+ * Traffic Class associated with each VDMA/PDMA mapping
+ * is stored in corresponding array entry.
+ */
+struct stmmac_hdma_cfg {
+ u32 tx_vdmas; /* TX VDMA count */
+ u32 rx_vdmas; /* RX VDMA count */
+ u32 tx_pdmas; /* TX PDMA count */
+ u32 rx_pdmas; /* RX PDMA count */
+ u8 *tvdma_tc; /* Tx VDMA to TC mapping array */
+ u8 *rvdma_tc; /* Rx VDMA to TC mapping array */
+ u8 *tpdma_tc; /* Tx PDMA to TC mapping array */
+ u8 *rpdma_tc; /* Rx PDMA to TC mapping array */
+};
+
struct stmmac_dma_cfg {
int pbl;
int txpbl;
@@ -101,6 +146,7 @@ struct stmmac_dma_cfg {
bool multi_msi_en;
bool dche;
bool atds;
+ struct stmmac_hdma_cfg *hdma_cfg;
};
#define AXI_BLEN 7
@@ -303,5 +349,7 @@ struct plat_stmmacenet_data {
int msi_tx_base_vec;
const struct dwmac4_addrs *dwmac4_addrs;
unsigned int flags;
+ u32 snps_id;
+ u32 snps_dev_id;
};
#endif
--
2.34.1
