Merge branch 'sun4i-emac-big-endian'

Michael Weiser says:

====================
sun4i-emac: Fixes for running a big-endian kernel on Cubieboard2

the following patches are what remains to be fixed in order to allow running a
big-endian kernel on the Cubieboard2.

The first patch fixes up endianness problems with DMA descriptors in
the stmmac driver preventing it from working correctly when runnning a
big-endian kernel.

The second patch adds the ability to enable diagnostic messages in the
sun4i-emac driver which were instrumental in finding the problem fixed
by patch number three: Endianness confusion caused by dual-purpose I/O
register usage in sun4i-emac.

All of these have been tested successfully on a Cubieboard2 DualCard.

Changes since v4:
- Rebased to current master
- Removed already applied patches to sunxi-mmc and sunxi-Kconfig

Changes since v3:
- Rebased sunxi-mmc patch against Ulf's mmc.git/next
- Changed Kconfig change to enable big-endian support only for sun7i
  devices

Changes since v2:
- Fixed typo in stmmac patch causing a build failure
- Added sun4i-emac patches

Changes since v1:
- Fixed checkpatch niggles
- Added respective Cc:s
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/allwinner/sun4i-emac.c

@@ -37,6 +37,11 @@
 
 #define EMAC_MAX_FRAME_LEN	0x0600
 
+#define EMAC_DEFAULT_MSG_ENABLE 0x0000
+static int debug = -1;     /* defaults above */;
+module_param(debug, int, 0);
+MODULE_PARM_DESC(debug, "debug message flags");
+
 /* Transmit timeout, default 5 seconds. */
 static int watchdog = 5000;
 module_param(watchdog, int, 0400);
@@ -225,11 +230,27 @@ static void emac_get_drvinfo(struct net_device *dev,
 	strlcpy(info->bus_info, dev_name(&dev->dev), sizeof(info->bus_info));
 }
 
+static u32 emac_get_msglevel(struct net_device *dev)
+{
+	struct emac_board_info *db = netdev_priv(dev);
+
+	return db->msg_enable;
+}
+
+static void emac_set_msglevel(struct net_device *dev, u32 value)
+{
+	struct emac_board_info *db = netdev_priv(dev);
+
+	db->msg_enable = value;
+}
+
 static const struct ethtool_ops emac_ethtool_ops = {
 	.get_drvinfo	= emac_get_drvinfo,
 	.get_link	= ethtool_op_get_link,
 	.get_link_ksettings = phy_ethtool_get_link_ksettings,
 	.set_link_ksettings = phy_ethtool_set_link_ksettings,
+	.get_msglevel	= emac_get_msglevel,
+	.set_msglevel	= emac_set_msglevel,
 };
 
 static unsigned int emac_setup(struct net_device *ndev)
@@ -571,8 +592,7 @@ static void emac_rx(struct net_device *dev)
 		/* A packet ready now  & Get status/length */
 		good_packet = true;
 
-		emac_inblk_32bit(db->membase + EMAC_RX_IO_DATA_REG,
-				&rxhdr, sizeof(rxhdr));
+		rxhdr = readl(db->membase + EMAC_RX_IO_DATA_REG);
 
 		if (netif_msg_rx_status(db))
 			dev_dbg(db->dev, "rxhdr: %x\n", *((int *)(&rxhdr)));
@@ -804,6 +824,7 @@ static int emac_probe(struct platform_device *pdev)
 	db->dev = &pdev->dev;
 	db->ndev = ndev;
 	db->pdev = pdev;
+	db->msg_enable = netif_msg_init(debug, EMAC_DEFAULT_MSG_ENABLE);
 
 	spin_lock_init(&db->lock);
 

drivers/net/ethernet/stmicro/stmmac/chain_mode.c

@@ -34,7 +34,7 @@ static int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int csum)
 	unsigned int entry = priv->cur_tx;
 	struct dma_desc *desc = priv->dma_tx + entry;
 	unsigned int nopaged_len = skb_headlen(skb);
-	unsigned int bmax;
+	unsigned int bmax, des2;
 	unsigned int i = 1, len;
 
 	if (priv->plat->enh_desc)
@@ -44,11 +44,12 @@ static int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int csum)
 
 	len = nopaged_len - bmax;
 
-	desc->des2 = dma_map_single(priv->device, skb->data,
-				    bmax, DMA_TO_DEVICE);
-	if (dma_mapping_error(priv->device, desc->des2))
+	des2 = dma_map_single(priv->device, skb->data,
+			      bmax, DMA_TO_DEVICE);
+	desc->des2 = cpu_to_le32(des2);
+	if (dma_mapping_error(priv->device, des2))
 		return -1;
-	priv->tx_skbuff_dma[entry].buf = desc->des2;
+	priv->tx_skbuff_dma[entry].buf = des2;
 	priv->tx_skbuff_dma[entry].len = bmax;
 	/* do not close the descriptor and do not set own bit */
 	priv->hw->desc->prepare_tx_desc(desc, 1, bmax, csum, STMMAC_CHAIN_MODE,
@@ -60,25 +61,27 @@ static int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int csum)
 		desc = priv->dma_tx + entry;
 
 		if (len > bmax) {
-			desc->des2 = dma_map_single(priv->device,
-						    (skb->data + bmax * i),
-						    bmax, DMA_TO_DEVICE);
-			if (dma_mapping_error(priv->device, desc->des2))
+			des2 = dma_map_single(priv->device,
+					      (skb->data + bmax * i),
+					      bmax, DMA_TO_DEVICE);
+			desc->des2 = cpu_to_le32(des2);
+			if (dma_mapping_error(priv->device, des2))
 				return -1;
-			priv->tx_skbuff_dma[entry].buf = desc->des2;
+			priv->tx_skbuff_dma[entry].buf = des2;
 			priv->tx_skbuff_dma[entry].len = bmax;
 			priv->hw->desc->prepare_tx_desc(desc, 0, bmax, csum,
 							STMMAC_CHAIN_MODE, 1,
 							false);
 			len -= bmax;
 			i++;
 		} else {
-			desc->des2 = dma_map_single(priv->device,
-						    (skb->data + bmax * i), len,
-						    DMA_TO_DEVICE);
-			if (dma_mapping_error(priv->device, desc->des2))
+			des2 = dma_map_single(priv->device,
+					      (skb->data + bmax * i), len,
+					      DMA_TO_DEVICE);
+			desc->des2 = cpu_to_le32(des2);
+			if (dma_mapping_error(priv->device, des2))
 				return -1;
-			priv->tx_skbuff_dma[entry].buf = desc->des2;
+			priv->tx_skbuff_dma[entry].buf = des2;
 			priv->tx_skbuff_dma[entry].len = len;
 			/* last descriptor can be set now */
 			priv->hw->desc->prepare_tx_desc(desc, 0, len, csum,
@@ -119,19 +122,19 @@ static void stmmac_init_dma_chain(void *des, dma_addr_t phy_addr,
 		struct dma_extended_desc *p = (struct dma_extended_desc *)des;
 		for (i = 0; i < (size - 1); i++) {
 			dma_phy += sizeof(struct dma_extended_desc);
-			p->basic.des3 = (unsigned int)dma_phy;
+			p->basic.des3 = cpu_to_le32((unsigned int)dma_phy);
 			p++;
 		}
-		p->basic.des3 = (unsigned int)phy_addr;
+		p->basic.des3 = cpu_to_le32((unsigned int)phy_addr);
 
 	} else {
 		struct dma_desc *p = (struct dma_desc *)des;
 		for (i = 0; i < (size - 1); i++) {
 			dma_phy += sizeof(struct dma_desc);
-			p->des3 = (unsigned int)dma_phy;
+			p->des3 = cpu_to_le32((unsigned int)dma_phy);
 			p++;
 		}
-		p->des3 = (unsigned int)phy_addr;
+		p->des3 = cpu_to_le32((unsigned int)phy_addr);
 	}
 }
 
@@ -144,10 +147,10 @@ static void stmmac_refill_desc3(void *priv_ptr, struct dma_desc *p)
 		 * 1588-2002 time stamping is enabled, hence reinitialize it
 		 * to keep explicit chaining in the descriptor.
 		 */
-		p->des3 = (unsigned int)(priv->dma_rx_phy +
-					 (((priv->dirty_rx) + 1) %
-					  DMA_RX_SIZE) *
-					 sizeof(struct dma_desc));
+		p->des3 = cpu_to_le32((unsigned int)(priv->dma_rx_phy +
+				      (((priv->dirty_rx) + 1) %
+				       DMA_RX_SIZE) *
+				      sizeof(struct dma_desc)));
 }
 
 static void stmmac_clean_desc3(void *priv_ptr, struct dma_desc *p)
@@ -161,9 +164,9 @@ static void stmmac_clean_desc3(void *priv_ptr, struct dma_desc *p)
 		 * 1588-2002 time stamping is enabled, hence reinitialize it
 		 * to keep explicit chaining in the descriptor.
 		 */
-		p->des3 = (unsigned int)((priv->dma_tx_phy +
-					  ((priv->dirty_tx + 1) % DMA_TX_SIZE))
-					  * sizeof(struct dma_desc));
+		p->des3 = cpu_to_le32((unsigned int)((priv->dma_tx_phy +
+				      ((priv->dirty_tx + 1) % DMA_TX_SIZE))
+				      * sizeof(struct dma_desc)));
 }
 
 const struct stmmac_mode_ops chain_mode_ops = {

drivers/net/ethernet/stmicro/stmmac/descs.h

@@ -87,7 +87,7 @@
 #define	TDES0_ERROR_SUMMARY		BIT(15)
 #define	TDES0_IP_HEADER_ERROR		BIT(16)
 #define	TDES0_TIME_STAMP_STATUS		BIT(17)
-#define	TDES0_OWN			BIT(31)
+#define	TDES0_OWN			((u32)BIT(31))	/* silence sparse */
 /* TDES1 */
 #define	TDES1_BUFFER1_SIZE_MASK		GENMASK(10, 0)
 #define	TDES1_BUFFER2_SIZE_MASK		GENMASK(21, 11)
@@ -130,7 +130,7 @@
 #define	ETDES0_FIRST_SEGMENT		BIT(28)
 #define	ETDES0_LAST_SEGMENT		BIT(29)
 #define	ETDES0_INTERRUPT		BIT(30)
-#define	ETDES0_OWN			BIT(31)
+#define	ETDES0_OWN			((u32)BIT(31))	/* silence sparse */
 /* TDES1 */
 #define	ETDES1_BUFFER1_SIZE_MASK	GENMASK(12, 0)
 #define	ETDES1_BUFFER2_SIZE_MASK	GENMASK(28, 16)
@@ -166,19 +166,19 @@
 
 /* Basic descriptor structure for normal and alternate descriptors */
 struct dma_desc {
-	unsigned int des0;
-	unsigned int des1;
-	unsigned int des2;
-	unsigned int des3;
+	__le32 des0;
+	__le32 des1;
+	__le32 des2;
+	__le32 des3;
 };
 
 /* Extended descriptor structure (e.g. >= databook 3.50a) */
 struct dma_extended_desc {
 	struct dma_desc basic;	/* Basic descriptors */
-	unsigned int des4;	/* Extended Status */
-	unsigned int des5;	/* Reserved */
-	unsigned int des6;	/* Tx/Rx Timestamp Low */
-	unsigned int des7;	/* Tx/Rx Timestamp High */
+	__le32 des4;	/* Extended Status */
+	__le32 des5;	/* Reserved */
+	__le32 des6;	/* Tx/Rx Timestamp Low */
+	__le32 des7;	/* Tx/Rx Timestamp High */
 };
 
 /* Transmit checksum insertion control */

drivers/net/ethernet/stmicro/stmmac/descs_com.h

@@ -35,91 +35,95 @@
 /* Enhanced descriptors */
 static inline void ehn_desc_rx_set_on_ring(struct dma_desc *p, int end)
 {
-	p->des1 |= ((BUF_SIZE_8KiB - 1) << ERDES1_BUFFER2_SIZE_SHIFT)
-		   & ERDES1_BUFFER2_SIZE_MASK;
+	p->des1 |= cpu_to_le32(((BUF_SIZE_8KiB - 1)
+			<< ERDES1_BUFFER2_SIZE_SHIFT)
+		   & ERDES1_BUFFER2_SIZE_MASK);
 
 	if (end)
-		p->des1 |= ERDES1_END_RING;
+		p->des1 |= cpu_to_le32(ERDES1_END_RING);
 }
 
 static inline void enh_desc_end_tx_desc_on_ring(struct dma_desc *p, int end)
 {
 	if (end)
-		p->des0 |= ETDES0_END_RING;
+		p->des0 |= cpu_to_le32(ETDES0_END_RING);
 	else
-		p->des0 &= ~ETDES0_END_RING;
+		p->des0 &= cpu_to_le32(~ETDES0_END_RING);
 }
 
 static inline void enh_set_tx_desc_len_on_ring(struct dma_desc *p, int len)
 {
 	if (unlikely(len > BUF_SIZE_4KiB)) {
-		p->des1 |= (((len - BUF_SIZE_4KiB) << ETDES1_BUFFER2_SIZE_SHIFT)
+		p->des1 |= cpu_to_le32((((len - BUF_SIZE_4KiB)
+					<< ETDES1_BUFFER2_SIZE_SHIFT)
 			    & ETDES1_BUFFER2_SIZE_MASK) | (BUF_SIZE_4KiB
-			    & ETDES1_BUFFER1_SIZE_MASK);
+			    & ETDES1_BUFFER1_SIZE_MASK));
 	} else
-		p->des1 |= (len & ETDES1_BUFFER1_SIZE_MASK);
+		p->des1 |= cpu_to_le32((len & ETDES1_BUFFER1_SIZE_MASK));
 }
 
 /* Normal descriptors */
 static inline void ndesc_rx_set_on_ring(struct dma_desc *p, int end)
 {
-	p->des1 |= ((BUF_SIZE_2KiB - 1) << RDES1_BUFFER2_SIZE_SHIFT)
-		    & RDES1_BUFFER2_SIZE_MASK;
+	p->des1 |= cpu_to_le32(((BUF_SIZE_2KiB - 1)
+				<< RDES1_BUFFER2_SIZE_SHIFT)
+		    & RDES1_BUFFER2_SIZE_MASK);
 
 	if (end)
-		p->des1 |= RDES1_END_RING;
+		p->des1 |= cpu_to_le32(RDES1_END_RING);
 }
 
 static inline void ndesc_end_tx_desc_on_ring(struct dma_desc *p, int end)
 {
 	if (end)
-		p->des1 |= TDES1_END_RING;
+		p->des1 |= cpu_to_le32(TDES1_END_RING);
 	else
-		p->des1 &= ~TDES1_END_RING;
+		p->des1 &= cpu_to_le32(~TDES1_END_RING);
 }
 
 static inline void norm_set_tx_desc_len_on_ring(struct dma_desc *p, int len)
 {
 	if (unlikely(len > BUF_SIZE_2KiB)) {
 		unsigned int buffer1 = (BUF_SIZE_2KiB - 1)
 					& TDES1_BUFFER1_SIZE_MASK;
-		p->des1 |= ((((len - buffer1) << TDES1_BUFFER2_SIZE_SHIFT)
-			    & TDES1_BUFFER2_SIZE_MASK) | buffer1);
+		p->des1 |= cpu_to_le32((((len - buffer1)
+					<< TDES1_BUFFER2_SIZE_SHIFT)
+				& TDES1_BUFFER2_SIZE_MASK) | buffer1);
 	} else
-		p->des1 |= (len & TDES1_BUFFER1_SIZE_MASK);
+		p->des1 |= cpu_to_le32((len & TDES1_BUFFER1_SIZE_MASK));
 }
 
 /* Specific functions used for Chain mode */
 
 /* Enhanced descriptors */
 static inline void ehn_desc_rx_set_on_chain(struct dma_desc *p)
 {
-	p->des1 |= ERDES1_SECOND_ADDRESS_CHAINED;
+	p->des1 |= cpu_to_le32(ERDES1_SECOND_ADDRESS_CHAINED);
 }
 
 static inline void enh_desc_end_tx_desc_on_chain(struct dma_desc *p)
 {
-	p->des0 |= ETDES0_SECOND_ADDRESS_CHAINED;
+	p->des0 |= cpu_to_le32(ETDES0_SECOND_ADDRESS_CHAINED);
 }
 
 static inline void enh_set_tx_desc_len_on_chain(struct dma_desc *p, int len)
 {
-	p->des1 |= (len & ETDES1_BUFFER1_SIZE_MASK);
+	p->des1 |= cpu_to_le32(len & ETDES1_BUFFER1_SIZE_MASK);
 }
 
 /* Normal descriptors */
 static inline void ndesc_rx_set_on_chain(struct dma_desc *p, int end)
 {
-	p->des1 |= RDES1_SECOND_ADDRESS_CHAINED;
+	p->des1 |= cpu_to_le32(RDES1_SECOND_ADDRESS_CHAINED);
 }
 
 static inline void ndesc_tx_set_on_chain(struct dma_desc *p)
 {
-	p->des1 |= TDES1_SECOND_ADDRESS_CHAINED;
+	p->des1 |= cpu_to_le32(TDES1_SECOND_ADDRESS_CHAINED);
 }
 
 static inline void norm_set_tx_desc_len_on_chain(struct dma_desc *p, int len)
 {
-	p->des1 |= len & TDES1_BUFFER1_SIZE_MASK;
+	p->des1 |= cpu_to_le32(len & TDES1_BUFFER1_SIZE_MASK);
 }
 #endif /* __DESC_COM_H__ */