altera_tse: Add support for dedicated descriptor memory

Signed-off-by: Joachim Foerster <joachim.foerster@missinglinkelectronics.com>

board/altera/nios2-generic/nios2-generic.c

@@ -74,7 +74,15 @@ int board_eth_init(bd_t *bis)
 	rc += altera_tse_initialize(0,
 				    CONFIG_SYS_ALTERA_TSE_MAC_BASE,
 				    CONFIG_SYS_ALTERA_TSE_SGDMA_RX_BASE,
-				    CONFIG_SYS_ALTERA_TSE_SGDMA_TX_BASE);
+				    CONFIG_SYS_ALTERA_TSE_SGDMA_TX_BASE,
+#if defined(CONFIG_SYS_ALTERA_TSE_SGDMA_DESC_BASE) && \
+	(CONFIG_SYS_ALTERA_TSE_SGDMA_DESC_SIZE > 0)
+				    CONFIG_SYS_ALTERA_TSE_SGDMA_DESC_BASE,
+				    CONFIG_SYS_ALTERA_TSE_SGDMA_DESC_SIZE);
+#else
+				    0,
+				    0);
+#endif
 #endif
 #ifdef CONFIG_ETHOC
 	rc += ethoc_initialize(0, CONFIG_SYS_ETHOC_BASE);

drivers/net/altera_tse.c

@@ -882,7 +882,8 @@ static int tse_eth_init(struct eth_device *dev, bd_t * bd)
 
 /* TSE init code */
 int altera_tse_initialize(u8 dev_num, int mac_base,
-			  int sgdma_rx_base, int sgdma_tx_base)
+			  int sgdma_rx_base, int sgdma_tx_base,
+			  u32 sgdma_desc_base, u32 sgdma_desc_size)
 {
 	struct altera_tse_priv *priv;
 	struct eth_device *dev;
@@ -903,8 +904,20 @@ int altera_tse_initialize(u8 dev_num, int mac_base,
 		free(dev);
 		return 0;
 	}
-	tx_desc = dma_alloc_coherent(sizeof(*tx_desc) * (3 + PKTBUFSRX),
-				     &dma_handle);
+	if (sgdma_desc_size) {
+		if (sgdma_desc_size < (sizeof(*tx_desc) * (3 + PKTBUFSRX))) {
+			printf("ALTERA_TSE-%hu: "
+			       "descriptor memory is too small\n", dev_num);
+			free(priv);
+			free(dev);
+			return 0;
+		}
+		tx_desc = (struct alt_sgdma_descriptor *)sgdma_desc_base;
+	} else {
+		tx_desc = dma_alloc_coherent(sizeof(*tx_desc) * (3 + PKTBUFSRX),
+					     &dma_handle);
+	}
+
 	rx_desc = tx_desc + 2;
 	debug("tx desc: address = 0x%x\n", (unsigned int)tx_desc);
 	debug("rx desc: address = 0x%x\n", (unsigned int)rx_desc);

include/netdev.h

@@ -42,7 +42,8 @@ int cpu_eth_init(bd_t *bis);
 
 /* Driver initialization prototypes */
 int altera_tse_initialize(u8 dev_num, int mac_base,
-			  int sgdma_rx_base, int sgdma_tx_base);
+			  int sgdma_rx_base, int sgdma_tx_base,
+			  u32 sgdma_desc_base, u32 sgdma_desc_size);
 int at91emac_register(bd_t *bis, unsigned long iobase);
 int au1x00_enet_initialize(bd_t*);
 int ax88180_initialize(bd_t *bis);