[PATCH net-next v2 0/6] ftgmac100 support for ast2500

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* [PATCH net-next v2 0/6]  ftgmac100 support for ast2500
@ 2016-09-21 23:04 Joel Stanley
  2016-09-21 23:04 ` [PATCH net-next v2 1/6] net/faraday: Separate rx page storage from rxdesc Joel Stanley
                   ` (6 more replies)
  0 siblings, 7 replies; 8+ messages in thread
From: Joel Stanley @ 2016-09-21 23:04 UTC (permalink / raw)
  To: davem; +Cc: clg, gwshan, andrew, andrew, netdev, linux-kernel, benh

Hello Dave,

This series adds support to the ftgmac100 driver for the Aspeed ast2400 and
ast2500 SoCs. In particular, they ensure the driver works correctly on the
ast2500 where the MAC block has seen some changes in register layout.

They have been tested on ast2400 and ast2500 systems with the NCSI stack and
with a directly attached PHY.

V2 reworks the two patches relating to PHYSTS_CHG into the one patch that
disables the interrupt instead of playing with interrupt sensitivity. I kept
patch 4 'net/faraday: Clear stale interrupts' which was first introduced to
clear the stale PHYSTS_CHG interrupt, as it helps keep us safe from unhygienic
(vendor) bootloaders.

Cheers,

Joel

Andrew Jeffery (2):
  net/faraday: Separate rx page storage from rxdesc
  net/faraday: Make EDO{R,T}R bits configurable

Gavin Shan (1):
  net/faraday: Clear stale interrupts

Joel Stanley (3):
  net/faraday: Adapt for Aspeed SoCs
  net/faraday: Configure old MDIO interface on Aspeed SoCs
  net/faraday: Mask out PHYSTS_CHG interrupt

 drivers/net/ethernet/faraday/ftgmac100.c | 97 +++++++++++++++++++++++---------
 drivers/net/ethernet/faraday/ftgmac100.h |  8 ++-
 2 files changed, 75 insertions(+), 30 deletions(-)

-- 
2.9.3

^ permalink raw reply	[flat|nested] 8+ messages in thread

* [PATCH net-next v2 1/6] net/faraday: Separate rx page storage from rxdesc
  2016-09-21 23:04 [PATCH net-next v2 0/6] ftgmac100 support for ast2500 Joel Stanley
@ 2016-09-21 23:04 ` Joel Stanley
  2016-09-21 23:04 ` [PATCH net-next v2 2/6] net/faraday: Make EDO{R,T}R bits configurable Joel Stanley
                   ` (5 subsequent siblings)
  6 siblings, 0 replies; 8+ messages in thread
From: Joel Stanley @ 2016-09-21 23:04 UTC (permalink / raw)
  To: davem; +Cc: clg, Andrew Jeffery, gwshan, andrew, netdev, linux-kernel, benh

From: Andrew Jeffery <andrew@aj.id.au>

The ftgmac100 hardware revision in e.g. the Aspeed AST2500 no longer
reserves all bits in RXDES#2 but instead uses the bottom 16 bits to
store MAC frame metadata. Avoid corruption by shifting struct page
pointers out to their own member in struct ftgmac100.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Joel Stanley <joel@jms.id.au>
---
 drivers/net/ethernet/faraday/ftgmac100.c | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
index 36361f8bf894..40622567159a 100644
--- a/drivers/net/ethernet/faraday/ftgmac100.c
+++ b/drivers/net/ethernet/faraday/ftgmac100.c
@@ -60,6 +60,8 @@ struct ftgmac100 {
 	struct ftgmac100_descs *descs;
 	dma_addr_t descs_dma_addr;
 
+	struct page *rx_pages[RX_QUEUE_ENTRIES];
+
 	unsigned int rx_pointer;
 	unsigned int tx_clean_pointer;
 	unsigned int tx_pointer;
@@ -341,18 +343,27 @@ static bool ftgmac100_rxdes_ipcs_err(struct ftgmac100_rxdes *rxdes)
 	return rxdes->rxdes1 & cpu_to_le32(FTGMAC100_RXDES1_IP_CHKSUM_ERR);
 }
 
+static inline struct page **ftgmac100_rxdes_page_slot(struct ftgmac100 *priv,
+						      struct ftgmac100_rxdes *rxdes)
+{
+	return &priv->rx_pages[rxdes - priv->descs->rxdes];
+}
+
 /*
  * rxdes2 is not used by hardware. We use it to keep track of page.
  * Since hardware does not touch it, we can skip cpu_to_le32()/le32_to_cpu().
  */
-static void ftgmac100_rxdes_set_page(struct ftgmac100_rxdes *rxdes, struct page *page)
+static void ftgmac100_rxdes_set_page(struct ftgmac100 *priv,
+				     struct ftgmac100_rxdes *rxdes,
+				     struct page *page)
 {
-	rxdes->rxdes2 = (unsigned int)page;
+	*ftgmac100_rxdes_page_slot(priv, rxdes) = page;
 }
 
-static struct page *ftgmac100_rxdes_get_page(struct ftgmac100_rxdes *rxdes)
+static struct page *ftgmac100_rxdes_get_page(struct ftgmac100 *priv,
+					     struct ftgmac100_rxdes *rxdes)
 {
-	return (struct page *)rxdes->rxdes2;
+	return *ftgmac100_rxdes_page_slot(priv, rxdes);
 }
 
 /******************************************************************************
@@ -501,7 +512,7 @@ static bool ftgmac100_rx_packet(struct ftgmac100 *priv, int *processed)
 
 	do {
 		dma_addr_t map = ftgmac100_rxdes_get_dma_addr(rxdes);
-		struct page *page = ftgmac100_rxdes_get_page(rxdes);
+		struct page *page = ftgmac100_rxdes_get_page(priv, rxdes);
 		unsigned int size;
 
 		dma_unmap_page(priv->dev, map, RX_BUF_SIZE, DMA_FROM_DEVICE);
@@ -779,7 +790,7 @@ static int ftgmac100_alloc_rx_page(struct ftgmac100 *priv,
 		return -ENOMEM;
 	}
 
-	ftgmac100_rxdes_set_page(rxdes, page);
+	ftgmac100_rxdes_set_page(priv, rxdes, page);
 	ftgmac100_rxdes_set_dma_addr(rxdes, map);
 	ftgmac100_rxdes_set_dma_own(rxdes);
 	return 0;
@@ -791,7 +802,7 @@ static void ftgmac100_free_buffers(struct ftgmac100 *priv)
 
 	for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
 		struct ftgmac100_rxdes *rxdes = &priv->descs->rxdes[i];
-		struct page *page = ftgmac100_rxdes_get_page(rxdes);
+		struct page *page = ftgmac100_rxdes_get_page(priv, rxdes);
 		dma_addr_t map = ftgmac100_rxdes_get_dma_addr(rxdes);
 
 		if (!page)
-- 
2.9.3

^ permalink raw reply related	[flat|nested] 8+ messages in thread

* [PATCH net-next v2 2/6] net/faraday: Make EDO{R,T}R bits configurable
  2016-09-21 23:04 [PATCH net-next v2 0/6] ftgmac100 support for ast2500 Joel Stanley
  2016-09-21 23:04 ` [PATCH net-next v2 1/6] net/faraday: Separate rx page storage from rxdesc Joel Stanley
@ 2016-09-21 23:04 ` Joel Stanley
  2016-09-21 23:05 ` [PATCH net-next v2 3/6] net/faraday: Adapt for Aspeed SoCs Joel Stanley
                   ` (4 subsequent siblings)
  6 siblings, 0 replies; 8+ messages in thread
From: Joel Stanley @ 2016-09-21 23:04 UTC (permalink / raw)
  To: davem; +Cc: clg, Andrew Jeffery, gwshan, andrew, netdev, linux-kernel, benh

From: Andrew Jeffery <andrew@aj.id.au>

These bits are #defined at a fixed location. In order to support future
hardware that has chosen to move these bits around move the bits into a
member of the struct ftgmac100.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Joel Stanley <joel@jms.id.au>
---
 drivers/net/ethernet/faraday/ftgmac100.c | 40 +++++++++++++++++++++-----------
 drivers/net/ethernet/faraday/ftgmac100.h |  2 --
 2 files changed, 26 insertions(+), 16 deletions(-)

diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
index 40622567159a..62a88d1a1f99 100644
--- a/drivers/net/ethernet/faraday/ftgmac100.c
+++ b/drivers/net/ethernet/faraday/ftgmac100.c
@@ -79,6 +79,9 @@ struct ftgmac100 {
 	int int_mask_all;
 	bool use_ncsi;
 	bool enabled;
+
+	u32 rxdes0_edorr_mask;
+	u32 txdes0_edotr_mask;
 };
 
 static int ftgmac100_alloc_rx_page(struct ftgmac100 *priv,
@@ -259,10 +262,11 @@ static bool ftgmac100_rxdes_packet_ready(struct ftgmac100_rxdes *rxdes)
 	return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_RXPKT_RDY);
 }
 
-static void ftgmac100_rxdes_set_dma_own(struct ftgmac100_rxdes *rxdes)
+static void ftgmac100_rxdes_set_dma_own(const struct ftgmac100 *priv,
+					struct ftgmac100_rxdes *rxdes)
 {
 	/* clear status bits */
-	rxdes->rxdes0 &= cpu_to_le32(FTGMAC100_RXDES0_EDORR);
+	rxdes->rxdes0 &= cpu_to_le32(priv->rxdes0_edorr_mask);
 }
 
 static bool ftgmac100_rxdes_rx_error(struct ftgmac100_rxdes *rxdes)
@@ -300,9 +304,10 @@ static bool ftgmac100_rxdes_multicast(struct ftgmac100_rxdes *rxdes)
 	return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_MULTICAST);
 }
 
-static void ftgmac100_rxdes_set_end_of_ring(struct ftgmac100_rxdes *rxdes)
+static void ftgmac100_rxdes_set_end_of_ring(const struct ftgmac100 *priv,
+					    struct ftgmac100_rxdes *rxdes)
 {
-	rxdes->rxdes0 |= cpu_to_le32(FTGMAC100_RXDES0_EDORR);
+	rxdes->rxdes0 |= cpu_to_le32(priv->rxdes0_edorr_mask);
 }
 
 static void ftgmac100_rxdes_set_dma_addr(struct ftgmac100_rxdes *rxdes,
@@ -393,7 +398,7 @@ ftgmac100_rx_locate_first_segment(struct ftgmac100 *priv)
 		if (ftgmac100_rxdes_first_segment(rxdes))
 			return rxdes;
 
-		ftgmac100_rxdes_set_dma_own(rxdes);
+		ftgmac100_rxdes_set_dma_own(priv, rxdes);
 		ftgmac100_rx_pointer_advance(priv);
 		rxdes = ftgmac100_current_rxdes(priv);
 	}
@@ -464,7 +469,7 @@ static void ftgmac100_rx_drop_packet(struct ftgmac100 *priv)
 		if (ftgmac100_rxdes_last_segment(rxdes))
 			done = true;
 
-		ftgmac100_rxdes_set_dma_own(rxdes);
+		ftgmac100_rxdes_set_dma_own(priv, rxdes);
 		ftgmac100_rx_pointer_advance(priv);
 		rxdes = ftgmac100_current_rxdes(priv);
 	} while (!done && ftgmac100_rxdes_packet_ready(rxdes));
@@ -556,10 +561,11 @@ static bool ftgmac100_rx_packet(struct ftgmac100 *priv, int *processed)
 /******************************************************************************
  * internal functions (transmit descriptor)
  *****************************************************************************/
-static void ftgmac100_txdes_reset(struct ftgmac100_txdes *txdes)
+static void ftgmac100_txdes_reset(const struct ftgmac100 *priv,
+				  struct ftgmac100_txdes *txdes)
 {
 	/* clear all except end of ring bit */
-	txdes->txdes0 &= cpu_to_le32(FTGMAC100_TXDES0_EDOTR);
+	txdes->txdes0 &= cpu_to_le32(priv->txdes0_edotr_mask);
 	txdes->txdes1 = 0;
 	txdes->txdes2 = 0;
 	txdes->txdes3 = 0;
@@ -580,9 +586,10 @@ static void ftgmac100_txdes_set_dma_own(struct ftgmac100_txdes *txdes)
 	txdes->txdes0 |= cpu_to_le32(FTGMAC100_TXDES0_TXDMA_OWN);
 }
 
-static void ftgmac100_txdes_set_end_of_ring(struct ftgmac100_txdes *txdes)
+static void ftgmac100_txdes_set_end_of_ring(const struct ftgmac100 *priv,
+					    struct ftgmac100_txdes *txdes)
 {
-	txdes->txdes0 |= cpu_to_le32(FTGMAC100_TXDES0_EDOTR);
+	txdes->txdes0 |= cpu_to_le32(priv->txdes0_edotr_mask);
 }
 
 static void ftgmac100_txdes_set_first_segment(struct ftgmac100_txdes *txdes)
@@ -701,7 +708,7 @@ static bool ftgmac100_tx_complete_packet(struct ftgmac100 *priv)
 
 	dev_kfree_skb(skb);
 
-	ftgmac100_txdes_reset(txdes);
+	ftgmac100_txdes_reset(priv, txdes);
 
 	ftgmac100_tx_clean_pointer_advance(priv);
 
@@ -792,7 +799,7 @@ static int ftgmac100_alloc_rx_page(struct ftgmac100 *priv,
 
 	ftgmac100_rxdes_set_page(priv, rxdes, page);
 	ftgmac100_rxdes_set_dma_addr(rxdes, map);
-	ftgmac100_rxdes_set_dma_own(rxdes);
+	ftgmac100_rxdes_set_dma_own(priv, rxdes);
 	return 0;
 }
 
@@ -839,7 +846,8 @@ static int ftgmac100_alloc_buffers(struct ftgmac100 *priv)
 		return -ENOMEM;
 
 	/* initialize RX ring */
-	ftgmac100_rxdes_set_end_of_ring(&priv->descs->rxdes[RX_QUEUE_ENTRIES - 1]);
+	ftgmac100_rxdes_set_end_of_ring(priv,
+					&priv->descs->rxdes[RX_QUEUE_ENTRIES - 1]);
 
 	for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
 		struct ftgmac100_rxdes *rxdes = &priv->descs->rxdes[i];
@@ -849,7 +857,8 @@ static int ftgmac100_alloc_buffers(struct ftgmac100 *priv)
 	}
 
 	/* initialize TX ring */
-	ftgmac100_txdes_set_end_of_ring(&priv->descs->txdes[TX_QUEUE_ENTRIES - 1]);
+	ftgmac100_txdes_set_end_of_ring(priv,
+					&priv->descs->txdes[TX_QUEUE_ENTRIES - 1]);
 	return 0;
 
 err:
@@ -1336,6 +1345,9 @@ static int ftgmac100_probe(struct platform_device *pdev)
 	priv->netdev = netdev;
 	priv->dev = &pdev->dev;
 
+	priv->rxdes0_edorr_mask = BIT(15);
+	priv->txdes0_edotr_mask = BIT(15);
+
 	spin_lock_init(&priv->tx_lock);
 
 	/* initialize NAPI */
diff --git a/drivers/net/ethernet/faraday/ftgmac100.h b/drivers/net/ethernet/faraday/ftgmac100.h
index 13408d448b05..c258586ce4a4 100644
--- a/drivers/net/ethernet/faraday/ftgmac100.h
+++ b/drivers/net/ethernet/faraday/ftgmac100.h
@@ -189,7 +189,6 @@ struct ftgmac100_txdes {
 } __attribute__ ((aligned(16)));
 
 #define FTGMAC100_TXDES0_TXBUF_SIZE(x)	((x) & 0x3fff)
-#define FTGMAC100_TXDES0_EDOTR		(1 << 15)
 #define FTGMAC100_TXDES0_CRC_ERR	(1 << 19)
 #define FTGMAC100_TXDES0_LTS		(1 << 28)
 #define FTGMAC100_TXDES0_FTS		(1 << 29)
@@ -215,7 +214,6 @@ struct ftgmac100_rxdes {
 } __attribute__ ((aligned(16)));
 
 #define FTGMAC100_RXDES0_VDBC		0x3fff
-#define FTGMAC100_RXDES0_EDORR		(1 << 15)
 #define FTGMAC100_RXDES0_MULTICAST	(1 << 16)
 #define FTGMAC100_RXDES0_BROADCAST	(1 << 17)
 #define FTGMAC100_RXDES0_RX_ERR		(1 << 18)
-- 
2.9.3

^ permalink raw reply related	[flat|nested] 8+ messages in thread

* [PATCH net-next v2 3/6] net/faraday: Adapt for Aspeed SoCs
  2016-09-21 23:04 [PATCH net-next v2 0/6] ftgmac100 support for ast2500 Joel Stanley
  2016-09-21 23:04 ` [PATCH net-next v2 1/6] net/faraday: Separate rx page storage from rxdesc Joel Stanley
  2016-09-21 23:04 ` [PATCH net-next v2 2/6] net/faraday: Make EDO{R,T}R bits configurable Joel Stanley
@ 2016-09-21 23:05 ` Joel Stanley
  2016-09-21 23:05 ` [PATCH net-next v2 4/6] net/faraday: Clear stale interrupts Joel Stanley
                   ` (3 subsequent siblings)
  6 siblings, 0 replies; 8+ messages in thread
From: Joel Stanley @ 2016-09-21 23:05 UTC (permalink / raw)
  To: davem; +Cc: clg, gwshan, andrew, andrew, netdev, linux-kernel, benh

The RXDES and TXDES registers bits in the ftgmac100 indicates EDO{R,T}R
at bit position 15 for the Faraday Tech IP. However, the version of this
IP present in the Aspeed SoCs has these bits at position 30 in the
registers.

It appers that ast2400 SoCs support both positions, with the 15th bit
marked as reserved but still functional. In the ast2500 this bit is
reused for another function, so we need a work around.

This was confirmed with engineers from Aspeed that using bit 30 is
correct for both the ast2400 and ast2500 SoCs.

Signed-off-by: Joel Stanley <joel@jms.id.au>
---
 drivers/net/ethernet/faraday/ftgmac100.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
index 62a88d1a1f99..47f512224b57 100644
--- a/drivers/net/ethernet/faraday/ftgmac100.c
+++ b/drivers/net/ethernet/faraday/ftgmac100.c
@@ -1345,9 +1345,6 @@ static int ftgmac100_probe(struct platform_device *pdev)
 	priv->netdev = netdev;
 	priv->dev = &pdev->dev;
 
-	priv->rxdes0_edorr_mask = BIT(15);
-	priv->txdes0_edotr_mask = BIT(15);
-
 	spin_lock_init(&priv->tx_lock);
 
 	/* initialize NAPI */
@@ -1381,6 +1378,16 @@ static int ftgmac100_probe(struct platform_device *pdev)
 			      FTGMAC100_INT_PHYSTS_CHG |
 			      FTGMAC100_INT_RPKT_BUF |
 			      FTGMAC100_INT_NO_RXBUF);
+
+	if (of_machine_is_compatible("aspeed,ast2400") ||
+	    of_machine_is_compatible("aspeed,ast2500")) {
+		priv->rxdes0_edorr_mask = BIT(30);
+		priv->txdes0_edotr_mask = BIT(30);
+	} else {
+		priv->rxdes0_edorr_mask = BIT(15);
+		priv->txdes0_edotr_mask = BIT(15);
+	}
+
 	if (pdev->dev.of_node &&
 	    of_get_property(pdev->dev.of_node, "use-ncsi", NULL)) {
 		if (!IS_ENABLED(CONFIG_NET_NCSI)) {
-- 
2.9.3

^ permalink raw reply related	[flat|nested] 8+ messages in thread

* [PATCH net-next v2 4/6] net/faraday: Clear stale interrupts
  2016-09-21 23:04 [PATCH net-next v2 0/6] ftgmac100 support for ast2500 Joel Stanley
                   ` (2 preceding siblings ...)
  2016-09-21 23:05 ` [PATCH net-next v2 3/6] net/faraday: Adapt for Aspeed SoCs Joel Stanley
@ 2016-09-21 23:05 ` Joel Stanley
  2016-09-21 23:05 ` [PATCH net-next v2 5/6] net/faraday: Configure old MDIO interface on Aspeed SoCs Joel Stanley
                   ` (2 subsequent siblings)
  6 siblings, 0 replies; 8+ messages in thread
From: Joel Stanley @ 2016-09-21 23:05 UTC (permalink / raw)
  To: davem; +Cc: clg, Gavin Shan, andrew, andrew, netdev, linux-kernel, benh

From: Gavin Shan <gwshan@linux.vnet.ibm.com>

There is stale interrupt (PHYSTS_CHG in ISR, bit#6 in 0x0) from
the bootloader (uboot) when enabling the MAC. The stale interrupts
aren't part of kernel and should be cleared.

This clears the stale interrupts in ISR (0x0) when enabling the MAC.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
---
 drivers/net/ethernet/faraday/ftgmac100.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
index 47f512224b57..189373743ddf 100644
--- a/drivers/net/ethernet/faraday/ftgmac100.c
+++ b/drivers/net/ethernet/faraday/ftgmac100.c
@@ -1112,6 +1112,7 @@ static int ftgmac100_poll(struct napi_struct *napi, int budget)
 static int ftgmac100_open(struct net_device *netdev)
 {
 	struct ftgmac100 *priv = netdev_priv(netdev);
+	unsigned int status;
 	int err;
 
 	err = ftgmac100_alloc_buffers(priv);
@@ -1137,6 +1138,11 @@ static int ftgmac100_open(struct net_device *netdev)
 
 	ftgmac100_init_hw(priv);
 	ftgmac100_start_hw(priv, priv->use_ncsi ? 100 : 10);
+
+	/* Clear stale interrupts */
+	status = ioread32(priv->base + FTGMAC100_OFFSET_ISR);
+	iowrite32(status, priv->base + FTGMAC100_OFFSET_ISR);
+
 	if (netdev->phydev)
 		phy_start(netdev->phydev);
 	else if (priv->use_ncsi)
-- 
2.9.3

^ permalink raw reply related	[flat|nested] 8+ messages in thread

* [PATCH net-next v2 5/6] net/faraday: Configure old MDIO interface on Aspeed SoCs
  2016-09-21 23:04 [PATCH net-next v2 0/6] ftgmac100 support for ast2500 Joel Stanley
                   ` (3 preceding siblings ...)
  2016-09-21 23:05 ` [PATCH net-next v2 4/6] net/faraday: Clear stale interrupts Joel Stanley
@ 2016-09-21 23:05 ` Joel Stanley
  2016-09-21 23:05 ` [PATCH net-next v2 6/6] net/faraday: Mask out PHYSTS_CHG interrupt Joel Stanley
  2016-09-22  7:31 ` [PATCH net-next v2 0/6] ftgmac100 support for ast2500 David Miller
  6 siblings, 0 replies; 8+ messages in thread
From: Joel Stanley @ 2016-09-21 23:05 UTC (permalink / raw)
  To: davem; +Cc: clg, gwshan, andrew, andrew, netdev, linux-kernel, benh

The Aspeed SoCs have a new MDIO interface as an option in the G4 and G5
SoCs. The old one is still available, so select it in order to remain
compatible with the ftgmac100 driver.

Signed-off-by: Joel Stanley <joel@jms.id.au>
---
 drivers/net/ethernet/faraday/ftgmac100.c | 9 +++++++++
 drivers/net/ethernet/faraday/ftgmac100.h | 5 +++++
 2 files changed, 14 insertions(+)

diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
index 189373743ddf..e3653b14008a 100644
--- a/drivers/net/ethernet/faraday/ftgmac100.c
+++ b/drivers/net/ethernet/faraday/ftgmac100.c
@@ -1252,12 +1252,21 @@ static int ftgmac100_setup_mdio(struct net_device *netdev)
 	struct ftgmac100 *priv = netdev_priv(netdev);
 	struct platform_device *pdev = to_platform_device(priv->dev);
 	int i, err = 0;
+	u32 reg;
 
 	/* initialize mdio bus */
 	priv->mii_bus = mdiobus_alloc();
 	if (!priv->mii_bus)
 		return -EIO;
 
+	if (of_machine_is_compatible("aspeed,ast2400") ||
+	    of_machine_is_compatible("aspeed,ast2500")) {
+		/* This driver supports the old MDIO interface */
+		reg = ioread32(priv->base + FTGMAC100_OFFSET_REVR);
+		reg &= ~FTGMAC100_REVR_NEW_MDIO_INTERFACE;
+		iowrite32(reg, priv->base + FTGMAC100_OFFSET_REVR);
+	};
+
 	priv->mii_bus->name = "ftgmac100_mdio";
 	snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s-%d",
 		 pdev->name, pdev->id);
diff --git a/drivers/net/ethernet/faraday/ftgmac100.h b/drivers/net/ethernet/faraday/ftgmac100.h
index c258586ce4a4..8a377ab1d127 100644
--- a/drivers/net/ethernet/faraday/ftgmac100.h
+++ b/drivers/net/ethernet/faraday/ftgmac100.h
@@ -134,6 +134,11 @@
 #define FTGMAC100_DMAFIFOS_TXDMA_REQ		(1 << 31)
 
 /*
+ * Feature Register
+ */
+#define FTGMAC100_REVR_NEW_MDIO_INTERFACE	BIT(31)
+
+/*
  * Receive buffer size register
  */
 #define FTGMAC100_RBSR_SIZE(x)		((x) & 0x3fff)
-- 
2.9.3

^ permalink raw reply related	[flat|nested] 8+ messages in thread

* [PATCH net-next v2 6/6] net/faraday: Mask out PHYSTS_CHG interrupt
  2016-09-21 23:04 [PATCH net-next v2 0/6] ftgmac100 support for ast2500 Joel Stanley
                   ` (4 preceding siblings ...)
  2016-09-21 23:05 ` [PATCH net-next v2 5/6] net/faraday: Configure old MDIO interface on Aspeed SoCs Joel Stanley
@ 2016-09-21 23:05 ` Joel Stanley
  2016-09-22  7:31 ` [PATCH net-next v2 0/6] ftgmac100 support for ast2500 David Miller
  6 siblings, 0 replies; 8+ messages in thread
From: Joel Stanley @ 2016-09-21 23:05 UTC (permalink / raw)
  To: davem; +Cc: clg, gwshan, andrew, andrew, netdev, linux-kernel, benh

The PHYSTS_CHG (the ftgmac100's PHY IRQ) is telling the system to go
look at the PHY registers for a link status change.

The interrupt was causing issues on Aspeed SoC where some board designs
had an active high configuration, some active low, and in some cases
repurposed for other functions. When misconfigured Linux would chew 100%
of CPU cycles servicing interrupts:

 [   20.280000] ftgmac100 1e660000.ethernet eth0: [ISR] = 0x200: PHYSTS_CHG
 [   20.280000] ftgmac100 1e660000.ethernet eth0: [ISR] = 0x200: PHYSTS_CHG
 [   20.280000] ftgmac100 1e660000.ethernet eth0: [ISR] = 0x200: PHYSTS_CHG
 [   20.300000] ftgmac100 1e660000.ethernet eth0: [ISR] = 0x200: PHYSTS_CHG

While in the ftgmac100 IP can be configured for high, low and edge
sensitivity the current driver always polls the PHY, so we chose to mask
out the interrupt.

See https://patchwork.ozlabs.org/patch/672099/ for more discussion.

Signed-off-by: Joel Stanley <joel@jms.id.au>
---
v2:
 - Reworked to mask out PHYSTS_CHG instead of trying to determine the IRQ line
   level

 drivers/net/ethernet/faraday/ftgmac100.c | 10 +++-------
 drivers/net/ethernet/faraday/ftgmac100.h |  1 +
 2 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
index e3653b14008a..90f9c5481290 100644
--- a/drivers/net/ethernet/faraday/ftgmac100.c
+++ b/drivers/net/ethernet/faraday/ftgmac100.c
@@ -1075,14 +1075,12 @@ static int ftgmac100_poll(struct napi_struct *napi, int budget)
 	}
 
 	if (status & priv->int_mask_all & (FTGMAC100_INT_NO_RXBUF |
-			FTGMAC100_INT_RPKT_LOST | FTGMAC100_INT_AHB_ERR |
-			FTGMAC100_INT_PHYSTS_CHG)) {
+			FTGMAC100_INT_RPKT_LOST | FTGMAC100_INT_AHB_ERR)) {
 		if (net_ratelimit())
-			netdev_info(netdev, "[ISR] = 0x%x: %s%s%s%s\n", status,
+			netdev_info(netdev, "[ISR] = 0x%x: %s%s%s\n", status,
 				    status & FTGMAC100_INT_NO_RXBUF ? "NO_RXBUF " : "",
 				    status & FTGMAC100_INT_RPKT_LOST ? "RPKT_LOST " : "",
-				    status & FTGMAC100_INT_AHB_ERR ? "AHB_ERR " : "",
-				    status & FTGMAC100_INT_PHYSTS_CHG ? "PHYSTS_CHG" : "");
+				    status & FTGMAC100_INT_AHB_ERR ? "AHB_ERR " : "");
 
 		if (status & FTGMAC100_INT_NO_RXBUF) {
 			/* RX buffer unavailable */
@@ -1390,7 +1388,6 @@ static int ftgmac100_probe(struct platform_device *pdev)
 			      FTGMAC100_INT_XPKT_ETH |
 			      FTGMAC100_INT_XPKT_LOST |
 			      FTGMAC100_INT_AHB_ERR |
-			      FTGMAC100_INT_PHYSTS_CHG |
 			      FTGMAC100_INT_RPKT_BUF |
 			      FTGMAC100_INT_NO_RXBUF);
 
@@ -1412,7 +1409,6 @@ static int ftgmac100_probe(struct platform_device *pdev)
 
 		dev_info(&pdev->dev, "Using NCSI interface\n");
 		priv->use_ncsi = true;
-		priv->int_mask_all &= ~FTGMAC100_INT_PHYSTS_CHG;
 		priv->ndev = ncsi_register_dev(netdev, ftgmac100_ncsi_handler);
 		if (!priv->ndev)
 			goto err_ncsi_dev;
diff --git a/drivers/net/ethernet/faraday/ftgmac100.h b/drivers/net/ethernet/faraday/ftgmac100.h
index 8a377ab1d127..a7ce0ac8858a 100644
--- a/drivers/net/ethernet/faraday/ftgmac100.h
+++ b/drivers/net/ethernet/faraday/ftgmac100.h
@@ -157,6 +157,7 @@
 #define FTGMAC100_MACCR_FULLDUP		(1 << 8)
 #define FTGMAC100_MACCR_GIGA_MODE	(1 << 9)
 #define FTGMAC100_MACCR_CRC_APD		(1 << 10)
+#define FTGMAC100_MACCR_PHY_LINK_LEVEL	(1 << 11)
 #define FTGMAC100_MACCR_RX_RUNT		(1 << 12)
 #define FTGMAC100_MACCR_JUMBO_LF	(1 << 13)
 #define FTGMAC100_MACCR_RX_ALL		(1 << 14)
-- 
2.9.3

^ permalink raw reply related	[flat|nested] 8+ messages in thread

* Re: [PATCH net-next v2 0/6] ftgmac100 support for ast2500
  2016-09-21 23:04 [PATCH net-next v2 0/6] ftgmac100 support for ast2500 Joel Stanley
                   ` (5 preceding siblings ...)
  2016-09-21 23:05 ` [PATCH net-next v2 6/6] net/faraday: Mask out PHYSTS_CHG interrupt Joel Stanley
@ 2016-09-22  7:31 ` David Miller
  6 siblings, 0 replies; 8+ messages in thread
From: David Miller @ 2016-09-22  7:31 UTC (permalink / raw)
  To: joel; +Cc: clg, gwshan, andrew, andrew, netdev, linux-kernel, benh

From: Joel Stanley <joel@jms.id.au>
Date: Thu, 22 Sep 2016 08:34:57 +0930

> Hello Dave,
> 
> This series adds support to the ftgmac100 driver for the Aspeed ast2400 and
> ast2500 SoCs. In particular, they ensure the driver works correctly on the
> ast2500 where the MAC block has seen some changes in register layout.
> 
> They have been tested on ast2400 and ast2500 systems with the NCSI stack and
> with a directly attached PHY.
> 
> V2 reworks the two patches relating to PHYSTS_CHG into the one patch that
> disables the interrupt instead of playing with interrupt sensitivity. I kept
> patch 4 'net/faraday: Clear stale interrupts' which was first introduced to
> clear the stale PHYSTS_CHG interrupt, as it helps keep us safe from unhygienic
> (vendor) bootloaders.

Series applied, thanks.

^ permalink raw reply	[flat|nested] 8+ messages in thread

end of thread, other threads:[~2016-09-22  7:31 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2016-09-21 23:04 [PATCH net-next v2 0/6] ftgmac100 support for ast2500 Joel Stanley
2016-09-21 23:04 ` [PATCH net-next v2 1/6] net/faraday: Separate rx page storage from rxdesc Joel Stanley
2016-09-21 23:04 ` [PATCH net-next v2 2/6] net/faraday: Make EDO{R,T}R bits configurable Joel Stanley
2016-09-21 23:05 ` [PATCH net-next v2 3/6] net/faraday: Adapt for Aspeed SoCs Joel Stanley
2016-09-21 23:05 ` [PATCH net-next v2 4/6] net/faraday: Clear stale interrupts Joel Stanley
2016-09-21 23:05 ` [PATCH net-next v2 5/6] net/faraday: Configure old MDIO interface on Aspeed SoCs Joel Stanley
2016-09-21 23:05 ` [PATCH net-next v2 6/6] net/faraday: Mask out PHYSTS_CHG interrupt Joel Stanley
2016-09-22  7:31 ` [PATCH net-next v2 0/6] ftgmac100 support for ast2500 David Miller

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