net: axienet: Support dynamic switching between 1000BaseX and SGMII

Newer versions of the Xilinx AXI Ethernet core (specifically version 7.2 or
later) allow the core to be configured with a PHY interface mode of "Both",
allowing either 1000BaseX or SGMII modes to be selected at runtime. Add
support for this in the driver to allow better support for applications
which can use both fiber and copper SFP modules.

Signed-off-by: Robert Hancock <robert.hancock@calian.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 18 insertions, 11 deletions

diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet.h b/drivers/net/ethernet/xilinx/xilinx_axienet.h
index a03c3ca1b28d..1e966a39967e 100644
--- a/drivers/net/ethernet/xilinx/xilinx_axienet.h
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet.h
@@ -339,6 +339,10 @@
 
 #define DELAY_OF_ONE_MILLISEC		1000
 
+/* Xilinx PCS/PMA PHY register for switching 1000BaseX or SGMII */
+#define XLNX_MII_STD_SELECT_REG		0x11
+#define XLNX_MII_STD_SELECT_SGMII	BIT(0)
+
 /**
  * struct axidma_bd - Axi Dma buffer descriptor layout
  * @next:         MM2S/S2MM Next Descriptor Pointer
@@ -377,22 +381,29 @@ struct axidma_bd {
  * @ndev:	Pointer for net_device to which it will be attached.
  * @dev:	Pointer to device structure
  * @phy_node:	Pointer to device node structure
+ * @phylink:	Pointer to phylink instance
+ * @phylink_config: phylink configuration settings
+ * @pcs_phy:	Reference to PCS/PMA PHY if used
+ * @switch_x_sgmii: Whether switchable 1000BaseX/SGMII mode is enabled in the core
+ * @clk:	Clock for AXI bus
  * @mii_bus:	Pointer to MII bus structure
  * @mii_clk_div: MII bus clock divider value
  * @regs_start: Resource start for axienet device addresses
  * @regs:	Base address for the axienet_local device address space
  * @dma_regs:	Base address for the axidma device address space
- * @dma_err_tasklet: Tasklet structure to process Axi DMA errors
+ * @dma_err_task: Work structure to process Axi DMA errors
  * @tx_irq:	Axidma TX IRQ number
  * @rx_irq:	Axidma RX IRQ number
+ * @eth_irq:	Ethernet core IRQ number
  * @phy_mode:	Phy type to identify between MII/GMII/RGMII/SGMII/1000 Base-X
  * @options:	AxiEthernet option word
- * @last_link:	Phy link state in which the PHY was negotiated earlier
  * @features:	Stores the extended features supported by the axienet hw
  * @tx_bd_v:	Virtual address of the TX buffer descriptor ring
  * @tx_bd_p:	Physical address(start address) of the TX buffer descr. ring
+ * @tx_bd_num:	Size of TX buffer descriptor ring
  * @rx_bd_v:	Virtual address of the RX buffer descriptor ring
  * @rx_bd_p:	Physical address(start address) of the RX buffer descr. ring
+ * @rx_bd_num:	Size of RX buffer descriptor ring
  * @tx_bd_ci:	Stores the index of the Tx buffer descriptor in the ring being
  *		accessed currently. Used while alloc. BDs before a TX starts
  * @tx_bd_tail:	Stores the index of the Tx buffer descriptor in the ring being
@@ -414,23 +425,20 @@ struct axienet_local {
 	struct net_device *ndev;
 	struct device *dev;
 
-	/* Connection to PHY device */
 	struct device_node *phy_node;
 
 	struct phylink *phylink;
 	struct phylink_config phylink_config;
 
-	/* Reference to PCS/PMA PHY if used */
 	struct mdio_device *pcs_phy;
 
-	/* Clock for AXI bus */
+	bool switch_x_sgmii;
+
 	struct clk *clk;
 
-	/* MDIO bus data */
-	struct mii_bus *mii_bus;	/* MII bus reference */
-	u8 mii_clk_div; /* MII bus clock divider value */
+	struct mii_bus *mii_bus;
+	u8 mii_clk_div;
 
-	/* IO registers, dma functions and IRQs */
 	resource_size_t regs_start;
 	void __iomem *regs;
 	void __iomem *dma_regs;
@@ -442,10 +450,9 @@ struct axienet_local {
 	int eth_irq;
 	phy_interface_t phy_mode;
 
-	u32 options;			/* Current options word */
+	u32 options;
 	u32 features;
 
-	/* Buffer descriptors */
 	struct axidma_bd *tx_bd_v;
 	dma_addr_t tx_bd_p;
 	u32 tx_bd_num;