net: ftmac110: Update tx/rx descriptor format

1. Reformat tx/rx descriptor as an uniform struct.
2. Replace uint32_t[2] with uint64_t for descriptor control.

Signed-off-by: Kuo-Jung Su <dantesu@faraday-tech.com>
CC: Joe Hershberger <joe.hershberger@gmail.com>

2 files changed, 82 insertions, 74 deletions

diff --git a/drivers/net/ftmac110.c b/drivers/net/ftmac110.c
index 7f54092..8eee272 100644
--- a/drivers/net/ftmac110.c
+++ b/drivers/net/ftmac110.c
@@ -54,11 +54,11 @@ struct ftmac110_chip {
 	uint32_t lnkup;
 	uint32_t phy_addr;
 
-	struct ftmac110_rxd *rxd;
+	struct ftmac110_desc *rxd;
 	ulong                rxd_dma;
 	uint32_t             rxd_idx;
 
-	struct ftmac110_txd *txd;
+	struct ftmac110_desc *txd;
 	ulong                txd_dma;
 	uint32_t             txd_idx;
 };
@@ -212,14 +212,15 @@ static int ftmac110_reset(struct eth_device *dev)
 	/* 1-1. Init tx ring */
 	for (i = 0; i < CFG_TXDES_NUM; ++i) {
 		/* owned by SW */
-		chip->txd[i].ct[0] = 0;
+		chip->txd[i].ctrl &= cpu_to_le64(FTMAC110_TXD_CLRMASK);
 	}
 	chip->txd_idx = 0;
 
 	/* 1-2. Init rx ring */
 	for (i = 0; i < CFG_RXDES_NUM; ++i) {
 		/* owned by HW */
-		chip->rxd[i].ct[0] = cpu_to_le32(FTMAC110_RXCT0_OWNER);
+		chip->rxd[i].ctrl &= cpu_to_le64(FTMAC110_RXD_CLRMASK);
+		chip->rxd[i].ctrl |= cpu_to_le64(FTMAC110_RXD_OWNER);
 	}
 	chip->rxd_idx = 0;
 
@@ -280,7 +281,8 @@ static int ftmac110_send(struct eth_device *dev, void *pkt, int len)
 {
 	struct ftmac110_chip *chip = dev->priv;
 	struct ftmac110_regs *regs = chip->regs;
-	struct ftmac110_txd *des;
+	struct ftmac110_desc *txd;
+	uint64_t ctrl;
 
 	if (!chip->lnkup)
 		return 0;
@@ -292,24 +294,26 @@ static int ftmac110_send(struct eth_device *dev, void *pkt, int len)
 
 	len = max(60, len);
 
-	des = &chip->txd[chip->txd_idx];
-	if (le32_to_cpu(des->ct[0]) & FTMAC110_TXCT0_OWNER) {
+	txd = &chip->txd[chip->txd_idx];
+	ctrl = le64_to_cpu(txd->ctrl);
+	if (ctrl & FTMAC110_TXD_OWNER) {
 		/* kick-off Tx DMA */
 		writel(0xffffffff, &regs->txpd);
 		printf("ftmac110: out of txd\n");
 		return 0;
 	}
 
-	memcpy(des->vbuf, (void *)pkt, len);
-	dma_map_single(des->vbuf, len, DMA_TO_DEVICE);
+	memcpy(txd->vbuf, (void *)pkt, len);
+	dma_map_single(txd->vbuf, len, DMA_TO_DEVICE);
 
-	/* update len, fts and lts */
-	des->ct[1] &= cpu_to_le32(FTMAC110_TXCT1_END);
-	des->ct[1] |= cpu_to_le32(FTMAC110_TXCT1_LEN(len)
-		| FTMAC110_TXCT1_FTS | FTMAC110_TXCT1_LTS);
-
-	/* set owner bit and clear others */
-	des->ct[0] = cpu_to_le32(FTMAC110_TXCT0_OWNER);
+	/* clear control bits */
+	ctrl &= FTMAC110_TXD_CLRMASK;
+	/* set len, fts and lts */
+	ctrl |= FTMAC110_TXD_LEN(len) | FTMAC110_TXD_FTS | FTMAC110_TXD_LTS;
+	/* set owner bit */
+	ctrl |= FTMAC110_TXD_OWNER;
+	/* write back to descriptor */
+	txd->ctrl = cpu_to_le64(ctrl);
 
 	/* kick-off Tx DMA */
 	writel(0xffffffff, &regs->txpd);
@@ -322,23 +326,24 @@ static int ftmac110_send(struct eth_device *dev, void *pkt, int len)
 static int ftmac110_recv(struct eth_device *dev)
 {
 	struct ftmac110_chip *chip = dev->priv;
-	struct ftmac110_rxd *des;
-	uint32_t ct0, len, rlen = 0;
+	struct ftmac110_desc *rxd;
+	uint32_t len, rlen = 0;
+	uint64_t ctrl;
 	uint8_t *buf;
 
 	if (!chip->lnkup)
 		return 0;
 
 	do {
-		des = &chip->rxd[chip->rxd_idx];
-		ct0 = le32_to_cpu(des->ct[0]);
-		if (ct0 & FTMAC110_RXCT0_OWNER)
+		rxd = &chip->rxd[chip->rxd_idx];
+		ctrl = le64_to_cpu(rxd->ctrl);
+		if (ctrl & FTMAC110_RXD_OWNER)
 			break;
 
-		len = FTMAC110_RXCT0_LEN(ct0);
-		buf = des->vbuf;
+		len = (uint32_t)FTMAC110_RXD_LEN(ctrl);
+		buf = rxd->vbuf;
 
-		if (ct0 & FTMAC110_RXCT0_ERRMASK) {
+		if (ctrl & FTMAC110_RXD_ERRMASK) {
 			printf("ftmac110: rx error\n");
 		} else {
 			dma_map_single(buf, len, DMA_FROM_DEVICE);
@@ -347,7 +352,9 @@ static int ftmac110_recv(struct eth_device *dev)
 		}
 
 		/* owned by hardware */
-		des->ct[0] = cpu_to_le32(FTMAC110_RXCT0_OWNER);
+		ctrl &= FTMAC110_RXD_CLRMASK;
+		ctrl |= FTMAC110_RXD_OWNER;
+		rxd->ctrl |= cpu_to_le64(ctrl);
 
 		chip->rxd_idx = (chip->rxd_idx + 1) % CFG_RXDES_NUM;
 	} while (0);
@@ -422,42 +429,43 @@ int ftmac110_initialize(bd_t *bis)
 
 	/* allocate tx descriptors (it must be 16 bytes aligned) */
 	chip->txd = dma_alloc_coherent(
-		sizeof(struct ftmac110_txd) * CFG_TXDES_NUM, &chip->txd_dma);
+		sizeof(struct ftmac110_desc) * CFG_TXDES_NUM, &chip->txd_dma);
 	if (!chip->txd)
 		panic("ftmac110: out of memory 3\n");
 	memset(chip->txd, 0,
-	       sizeof(struct ftmac110_txd) * CFG_TXDES_NUM);
+	       sizeof(struct ftmac110_desc) * CFG_TXDES_NUM);
 	for (i = 0; i < CFG_TXDES_NUM; ++i) {
 		void *va = memalign(ARCH_DMA_MINALIGN, CFG_XBUF_SIZE);
+
 		if (!va)
 			panic("ftmac110: out of memory 4\n");
-		chip->txd[i].vbuf  = va;
-		chip->txd[i].buf   = cpu_to_le32(virt_to_phys(va));
-		chip->txd[i].ct[1] = 0;
-		chip->txd[i].ct[0] = 0; /* owned by SW */
+		chip->txd[i].vbuf = va;
+		chip->txd[i].pbuf = cpu_to_le32(virt_to_phys(va));
+		chip->txd[i].ctrl = 0;	/* owned by SW */
 	}
-	chip->txd[i - 1].ct[1] |= cpu_to_le32(FTMAC110_TXCT1_END);
+	chip->txd[i - 1].ctrl |= cpu_to_le64(FTMAC110_TXD_END);
 	chip->txd_idx = 0;
 
 	/* allocate rx descriptors (it must be 16 bytes aligned) */
 	chip->rxd = dma_alloc_coherent(
-		sizeof(struct ftmac110_rxd) * CFG_RXDES_NUM, &chip->rxd_dma);
+		sizeof(struct ftmac110_desc) * CFG_RXDES_NUM, &chip->rxd_dma);
 	if (!chip->rxd)
 		panic("ftmac110: out of memory 4\n");
 	memset((void *)chip->rxd, 0,
-	       sizeof(struct ftmac110_rxd) * CFG_RXDES_NUM);
+	       sizeof(struct ftmac110_desc) * CFG_RXDES_NUM);
 	for (i = 0; i < CFG_RXDES_NUM; ++i) {
 		void *va = memalign(ARCH_DMA_MINALIGN, CFG_XBUF_SIZE + 2);
+
 		if (!va)
 			panic("ftmac110: out of memory 5\n");
 		/* it needs to be exactly 2 bytes aligned */
 		va = ((uint8_t *)va + 2);
-		chip->rxd[i].vbuf  = va;
-		chip->rxd[i].buf   = cpu_to_le32(virt_to_phys(va));
-		chip->rxd[i].ct[1] = cpu_to_le32(CFG_XBUF_SIZE);
-		chip->rxd[i].ct[0] = cpu_to_le32(FTMAC110_RXCT0_OWNER);
+		chip->rxd[i].vbuf = va;
+		chip->rxd[i].pbuf = cpu_to_le32(virt_to_phys(va));
+		chip->rxd[i].ctrl = cpu_to_le64(FTMAC110_RXD_OWNER
+			| FTMAC110_RXD_BUFSZ(CFG_XBUF_SIZE));
 	}
-	chip->rxd[i - 1].ct[1] |= cpu_to_le32(FTMAC110_RXCT1_END);
+	chip->rxd[i - 1].ctrl |= cpu_to_le64(FTMAC110_RXD_END);
 	chip->rxd_idx = 0;
 
 	eth_register(dev);
diff --git a/drivers/net/ftmac110.h b/drivers/net/ftmac110.h
index a383afa..2772ae7 100644
--- a/drivers/net/ftmac110.h
+++ b/drivers/net/ftmac110.h
@@ -135,42 +135,42 @@ struct ftmac110_regs {
 /*
  * descriptor structure
  */
-struct ftmac110_rxd {
-	uint32_t ct[2];
-	uint32_t buf;
-	void    *vbuf; /* reserved */
+struct ftmac110_desc {
+	uint64_t ctrl;
+	uint32_t pbuf;
+	void    *vbuf;
 };
 
-#define FTMAC110_RXCT0_OWNER       BIT_MASK(31) /* owner: 1=HW, 0=SW */
-#define FTMAC110_RXCT0_FRS         BIT_MASK(29) /* first pkt desc */
-#define FTMAC110_RXCT0_LRS         BIT_MASK(28) /* last pkt desc */
-#define FTMAC110_RXCT0_ODDNB       BIT_MASK(22) /* odd nibble */
-#define FTMAC110_RXCT0_RUNT        BIT_MASK(21) /* runt pkt */
-#define FTMAC110_RXCT0_FTL         BIT_MASK(20) /* frame too long */
-#define FTMAC110_RXCT0_CRC         BIT_MASK(19) /* pkt crc error */
-#define FTMAC110_RXCT0_ERR         BIT_MASK(18) /* bus error */
-#define FTMAC110_RXCT0_ERRMASK     (0x1f << 18) /* all errors */
-#define FTMAC110_RXCT0_BCST        BIT_MASK(17) /* Bcst pkt */
-#define FTMAC110_RXCT0_MCST        BIT_MASK(16) /* Mcst pkt */
-#define FTMAC110_RXCT0_LEN(x)      ((x) & 0x7ff)
-
-#define FTMAC110_RXCT1_END         BIT_MASK(31)
-#define FTMAC110_RXCT1_BUFSZ(x)    ((x) & 0x7ff)
-
-struct ftmac110_txd {
-	uint32_t ct[2];
-	uint32_t buf;
-	void    *vbuf; /* reserved */
-};
-
-#define FTMAC110_TXCT0_OWNER       BIT_MASK(31) /* owner: 1=HW, 0=SW */
-#define FTMAC110_TXCT0_COL         0x00000003   /* collision */
-
-#define FTMAC110_TXCT1_END         BIT_MASK(31) /* end of ring */
-#define FTMAC110_TXCT1_TXIC        BIT_MASK(30) /* tx done interrupt */
-#define FTMAC110_TXCT1_TX2FIC      BIT_MASK(29) /* tx fifo interrupt */
-#define FTMAC110_TXCT1_FTS         BIT_MASK(28) /* first pkt desc */
-#define FTMAC110_TXCT1_LTS         BIT_MASK(27) /* last pkt desc */
-#define FTMAC110_TXCT1_LEN(x)      ((x) & 0x7ff)
+#define FTMAC110_RXD_END        ((uint64_t)1 << 63)
+#define FTMAC110_RXD_BUFSZ(x)   (((uint64_t)(x) & 0x7ff) << 32)
+
+#define FTMAC110_RXD_OWNER      ((uint64_t)1 << 31) /* owner: 1=HW, 0=SW */
+#define FTMAC110_RXD_FRS        ((uint64_t)1 << 29) /* first pkt desc */
+#define FTMAC110_RXD_LRS        ((uint64_t)1 << 28) /* last pkt desc */
+#define FTMAC110_RXD_ODDNB      ((uint64_t)1 << 22) /* odd nibble */
+#define FTMAC110_RXD_RUNT       ((uint64_t)1 << 21) /* runt pkt */
+#define FTMAC110_RXD_FTL        ((uint64_t)1 << 20) /* frame too long */
+#define FTMAC110_RXD_CRC        ((uint64_t)1 << 19) /* pkt crc error */
+#define FTMAC110_RXD_ERR        ((uint64_t)1 << 18) /* bus error */
+#define FTMAC110_RXD_ERRMASK    ((uint64_t)0x1f << 18)
+#define FTMAC110_RXD_BCST       ((uint64_t)1 << 17) /* Bcst pkt */
+#define FTMAC110_RXD_MCST       ((uint64_t)1 << 16) /* Mcst pkt */
+#define FTMAC110_RXD_LEN(x)     ((uint64_t)((x) & 0x7ff))
+
+#define FTMAC110_RXD_CLRMASK	\
+	(FTMAC110_RXD_END | FTMAC110_RXD_BUFSZ(0x7ff))
+
+#define FTMAC110_TXD_END    ((uint64_t)1 << 63) /* end of ring */
+#define FTMAC110_TXD_TXIC   ((uint64_t)1 << 62) /* tx done interrupt */
+#define FTMAC110_TXD_TX2FIC ((uint64_t)1 << 61) /* tx fifo interrupt */
+#define FTMAC110_TXD_FTS    ((uint64_t)1 << 60) /* first pkt desc */
+#define FTMAC110_TXD_LTS    ((uint64_t)1 << 59) /* last pkt desc */
+#define FTMAC110_TXD_LEN(x) ((uint64_t)((x) & 0x7ff) << 32)
+
+#define FTMAC110_TXD_OWNER  ((uint64_t)1 << 31)	/* owner: 1=HW, 0=SW */
+#define FTMAC110_TXD_COL    ((uint64_t)3)		/* collision */
+
+#define FTMAC110_TXD_CLRMASK    \
+	(FTMAC110_TXD_END)
 
 #endif  /* FTMAC110_H */