pico-imx6ul: Add Ethernet support

Pico-imx6ul has a KSZ8081 Ethernet PHY.

Add support for it.

Signed-off-by: Diego Dorta <diego.dorta@nxp.com>
Acked-by: Fabio Estevam <fabio.estevam@nxp.com>
Reviewed-by: Stefano Babic <sbabic@denx.de>

board/technexion/pico-imx6ul/pico-imx6ul.c

@@ -16,6 +16,8 @@
 #include <asm/imx-common/iomux-v3.h>
 #include <asm/io.h>
 #include <common.h>
+#include <miiphy.h>
+#include <netdev.h>
 #include <fsl_esdhc.h>
 #include <linux/sizes.h>
 #include <usb.h>
@@ -34,6 +36,87 @@ DECLARE_GLOBAL_DATA_PTR;
 	PAD_CTL_PUS_47K_UP  | PAD_CTL_SPEED_LOW |		\
 	PAD_CTL_DSE_80ohm   | PAD_CTL_SRE_FAST  | PAD_CTL_HYS)
 
+#define MDIO_PAD_CTRL  (PAD_CTL_PUS_100K_UP | PAD_CTL_PUE |     \
+	PAD_CTL_DSE_48ohm   | PAD_CTL_SRE_FAST | PAD_CTL_ODE)
+
+#define ENET_PAD_CTRL  (PAD_CTL_PUS_100K_UP | PAD_CTL_PUE |     \
+	PAD_CTL_SPEED_HIGH   |                                   \
+	PAD_CTL_DSE_48ohm   | PAD_CTL_SRE_FAST)
+
+#define ENET_CLK_PAD_CTRL  (PAD_CTL_DSE_40ohm   | PAD_CTL_SRE_FAST)
+
+#define RMII_PHY_RESET IMX_GPIO_NR(1, 28)
+
+static iomux_v3_cfg_t const fec_pads[] = {
+	MX6_PAD_ENET1_TX_EN__ENET2_MDC		| MUX_PAD_CTRL(MDIO_PAD_CTRL),
+	MX6_PAD_ENET1_TX_DATA1__ENET2_MDIO	| MUX_PAD_CTRL(MDIO_PAD_CTRL),
+	MX6_PAD_ENET2_TX_DATA0__ENET2_TDATA00	| MUX_PAD_CTRL(ENET_PAD_CTRL),
+	MX6_PAD_ENET2_TX_DATA1__ENET2_TDATA01	| MUX_PAD_CTRL(ENET_PAD_CTRL),
+	MX6_PAD_ENET2_TX_CLK__ENET2_REF_CLK2	| MUX_PAD_CTRL(ENET_CLK_PAD_CTRL),
+	MX6_PAD_ENET2_TX_EN__ENET2_TX_EN	| MUX_PAD_CTRL(ENET_PAD_CTRL),
+	MX6_PAD_ENET2_RX_DATA0__ENET2_RDATA00	| MUX_PAD_CTRL(ENET_PAD_CTRL),
+	MX6_PAD_ENET2_RX_DATA1__ENET2_RDATA01	| MUX_PAD_CTRL(ENET_PAD_CTRL),
+	MX6_PAD_ENET2_RX_EN__ENET2_RX_EN	| MUX_PAD_CTRL(ENET_PAD_CTRL),
+	MX6_PAD_ENET2_RX_ER__ENET2_RX_ER	| MUX_PAD_CTRL(ENET_PAD_CTRL),
+	MX6_PAD_UART4_TX_DATA__GPIO1_IO28	| MUX_PAD_CTRL(NO_PAD_CTRL),
+};
+
+static void setup_iomux_fec(void)
+{
+	imx_iomux_v3_setup_multiple_pads(fec_pads, ARRAY_SIZE(fec_pads));
+}
+
+int board_eth_init(bd_t *bis)
+{
+	setup_iomux_fec();
+
+	gpio_direction_output(RMII_PHY_RESET, 0);
+	/*
+	 * According to KSZ8081MNX-RNB manual:
+	 * For warm reset, the reset (RST#) pin should be asserted low for a
+	 * minimum of 500μs.  The strap-in pin values are read and updated
+	 * at the de-assertion of reset.
+	 */
+	udelay(500);
+
+	gpio_direction_output(RMII_PHY_RESET, 1);
+	/*
+	 * According to KSZ8081MNX-RNB manual:
+	 * After the de-assertion of reset, wait a minimum of 100μs before
+	 * starting programming on the MIIM (MDC/MDIO) interface.
+	 */
+	udelay(100);
+
+	return fecmxc_initialize(bis);
+}
+
+static int setup_fec(void)
+{
+	struct iomuxc *const iomuxc_regs = (struct iomuxc *)IOMUXC_BASE_ADDR;
+	int ret;
+
+	clrsetbits_le32(&iomuxc_regs->gpr[1], IOMUX_GPR1_FEC2_MASK,
+			IOMUX_GPR1_FEC2_CLOCK_MUX1_SEL_MASK);
+
+	ret = enable_fec_anatop_clock(1, ENET_50MHZ);
+	if (ret)
+		return ret;
+
+	enable_enet_clk(1);
+
+	return 0;
+}
+
+int board_phy_config(struct phy_device *phydev)
+{
+	phy_write(phydev, MDIO_DEVAD_NONE, 0x1f, 0x8190);
+
+	if (phydev->drv->config)
+		phydev->drv->config(phydev);
+
+	return 0;
+}
+
 int dram_init(void)
 {
 	gd->ram_size = imx_ddr_size();
@@ -106,6 +189,7 @@ int board_init(void)
 	/* Address of boot parameters */
 	gd->bd->bi_boot_params = PHYS_SDRAM + 0x100;
 
+	setup_fec();
 	setup_usb();
 
 	return 0;

include/configs/pico-imx6ul.h

@@ -17,6 +17,16 @@
 #define CONFIG_DISPLAY_CPUINFO
 #define CONFIG_DISPLAY_BOARDINFO
 
+/* Network support */
+
+#define CONFIG_FEC_MXC
+#define CONFIG_MII
+#define IMX_FEC_BASE			ENET2_BASE_ADDR
+#define CONFIG_FEC_MXC_PHYADDR		0x1
+#define CONFIG_FEC_XCV_TYPE		RMII
+#define CONFIG_PHYLIB
+#define CONFIG_PHY_MICREL
+
 /* Size of malloc() pool */
 #define CONFIG_SYS_MALLOC_LEN		(16 * SZ_1M)