mvebu: a37xx: Add init for ESPRESSBin Topaz switch

Implement the board-specific network init function for
ESPRESSOBin community board, setting the on-board Topaz
switch port to forward mode and allow network connection
through any of the available Etherenet ports.

Signed-off-by: Konstantin Porotchkin <kostap@marvell.com>
Cc: Stefan Roese <sr@denx.de>
Cc: Igal Liberman <igall@marvell.com>
Cc: Nadav Haklai <nadavh@marvell.com>
Cc: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: Joe Hershberger <joe.hershberger@ni.com>
Signed-off-by: Stefan Roese <sr@denx.de>

board/Marvell/mvebu_armada-37xx/board.c

@@ -5,7 +5,9 @@
  */
 
 #include <common.h>
+#include <dm.h>
 #include <i2c.h>
+#include <phy.h>
 #include <asm/io.h>
 #include <asm/arch/cpu.h>
 #include <asm/arch/soc.h>
@@ -22,6 +24,29 @@ DECLARE_GLOBAL_DATA_PTR;
 #define PINCTRL_NB_REG_VALUE	0x000173fa
 #define PINCTRL_SB_REG_VALUE	0x00007a23
 
+/* Ethernet switch registers */
+/* SMI addresses for multi-chip mode */
+#define MVEBU_PORT_CTRL_SMI_ADDR(p)	(16 + (p))
+#define MVEBU_SW_G2_SMI_ADDR		(28)
+
+/* Multi-chip mode */
+#define MVEBU_SW_SMI_DATA_REG		(1)
+#define MVEBU_SW_SMI_CMD_REG		(0)
+ #define SW_SMI_CMD_REG_ADDR_OFF	0
+ #define SW_SMI_CMD_DEV_ADDR_OFF	5
+ #define SW_SMI_CMD_SMI_OP_OFF		10
+ #define SW_SMI_CMD_SMI_MODE_OFF	12
+ #define SW_SMI_CMD_SMI_BUSY_OFF	15
+
+/* Single-chip mode */
+/* Switch Port Registers */
+#define MVEBU_SW_LINK_CTRL_REG		(1)
+#define MVEBU_SW_PORT_CTRL_REG		(4)
+
+/* Global 2 Registers */
+#define MVEBU_G2_SMI_PHY_CMD_REG	(24)
+#define MVEBU_G2_SMI_PHY_DATA_REG	(25)
+
 int board_early_init_f(void)
 {
 	const void *blob = gd->fdt_blob;
@@ -156,3 +181,69 @@ int board_xhci_enable(void)
 
 	return 0;
 }
+
+/* Helper function for accessing switch devices in multi-chip connection mode */
+static int mii_multi_chip_mode_write(struct mii_dev *bus, int dev_smi_addr,
+				     int smi_addr, int reg, u16 value)
+{
+	u16 smi_cmd = 0;
+
+	if (bus->write(bus, dev_smi_addr, 0,
+		       MVEBU_SW_SMI_DATA_REG, value) != 0) {
+		printf("Error writing to the PHY addr=%02x reg=%02x\n",
+		       smi_addr, reg);
+		return -EFAULT;
+	}
+
+	smi_cmd = (1 << SW_SMI_CMD_SMI_BUSY_OFF) |
+		  (1 << SW_SMI_CMD_SMI_MODE_OFF) |
+		  (1 << SW_SMI_CMD_SMI_OP_OFF) |
+		  (smi_addr << SW_SMI_CMD_DEV_ADDR_OFF) |
+		  (reg << SW_SMI_CMD_REG_ADDR_OFF);
+	if (bus->write(bus, dev_smi_addr, 0,
+		       MVEBU_SW_SMI_CMD_REG, smi_cmd) != 0) {
+		printf("Error writing to the PHY addr=%02x reg=%02x\n",
+		       smi_addr, reg);
+		return -EFAULT;
+	}
+
+	return 0;
+}
+
+/* Bring-up board-specific network stuff */
+int board_network_enable(struct mii_dev *bus)
+{
+	if (!of_machine_is_compatible("marvell,armada-3720-espressobin"))
+		return 0;
+
+	/*
+	 * FIXME: remove this code once Topaz driver gets available
+	 * A3720 Community Board Only
+	 * Configure Topaz switch (88E6341)
+	 * Set port 0,1,2,3 to forwarding Mode (through Switch Port registers)
+	 */
+	mii_multi_chip_mode_write(bus, 1, MVEBU_PORT_CTRL_SMI_ADDR(0),
+				  MVEBU_SW_PORT_CTRL_REG, 0x7f);
+	mii_multi_chip_mode_write(bus, 1, MVEBU_PORT_CTRL_SMI_ADDR(1),
+				  MVEBU_SW_PORT_CTRL_REG, 0x7f);
+	mii_multi_chip_mode_write(bus, 1, MVEBU_PORT_CTRL_SMI_ADDR(2),
+				  MVEBU_SW_PORT_CTRL_REG, 0x7f);
+	mii_multi_chip_mode_write(bus, 1, MVEBU_PORT_CTRL_SMI_ADDR(3),
+				  MVEBU_SW_PORT_CTRL_REG, 0x7f);
+
+	/* RGMII Delay on Port 0 (CPU port), force link to 1000Mbps */
+	mii_multi_chip_mode_write(bus, 1, MVEBU_PORT_CTRL_SMI_ADDR(0),
+				  MVEBU_SW_LINK_CTRL_REG, 0xe002);
+
+	/* Power up PHY 1, 2, 3 (through Global 2 registers) */
+	mii_multi_chip_mode_write(bus, 1, MVEBU_SW_G2_SMI_ADDR,
+				  MVEBU_G2_SMI_PHY_DATA_REG, 0x1140);
+	mii_multi_chip_mode_write(bus, 1, MVEBU_SW_G2_SMI_ADDR,
+				  MVEBU_G2_SMI_PHY_CMD_REG, 0x9620);
+	mii_multi_chip_mode_write(bus, 1, MVEBU_SW_G2_SMI_ADDR,
+				  MVEBU_G2_SMI_PHY_CMD_REG, 0x9640);
+	mii_multi_chip_mode_write(bus, 1, MVEBU_SW_G2_SMI_ADDR,
+				  MVEBU_G2_SMI_PHY_CMD_REG, 0x9660);
+
+	return 0;
+}