mx6slevk: Add Ethernet support

mx6slevk has a SMSC8720 connected in RMII mode.

Add support for it.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>

arch/arm/cpu/armv7/mx6/clock.c

@@ -282,6 +282,36 @@ static u32 get_mmdc_ch0_clk(void)
 	return freq / (podf + 1);
 
 }
+
+int enable_fec_anatop_clock(void)
+{
+	u32 reg = 0;
+	s32 timeout = 100000;
+
+	struct anatop_regs __iomem *anatop =
+		(struct anatop_regs __iomem *)ANATOP_BASE_ADDR;
+
+	reg = readl(&anatop->pll_enet);
+	if ((reg & BM_ANADIG_PLL_ENET_POWERDOWN) ||
+	    (!(reg & BM_ANADIG_PLL_ENET_LOCK))) {
+		reg &= ~BM_ANADIG_PLL_ENET_POWERDOWN;
+		writel(reg, &anatop->pll_enet);
+		while (timeout--) {
+			if (readl(&anatop->pll_enet) & BM_ANADIG_PLL_ENET_LOCK)
+				break;
+		}
+		if (timeout < 0)
+			return -ETIMEDOUT;
+	}
+
+	/* Enable FEC clock */
+	reg |= BM_ANADIG_PLL_ENET_ENABLE;
+	reg &= ~BM_ANADIG_PLL_ENET_BYPASS;
+	writel(reg, &anatop->pll_enet);
+
+	return 0;
+}
+
 #else
 static u32 get_mmdc_ch0_clk(void)
 {

arch/arm/include/asm/arch-mx6/clock.h

@@ -50,4 +50,5 @@ void enable_usboh3_clk(unsigned char enable);
 int enable_sata_clock(void);
 int enable_i2c_clk(unsigned char enable, unsigned i2c_num);
 void enable_ipu_clock(void);
+int enable_fec_anatop_clock(void);
 #endif /* __ASM_ARCH_CLOCK_H */

arch/arm/include/asm/arch-mx6/iomux.h

@@ -27,6 +27,11 @@
 #define IOMUXC_GPR13_SATA_PHY_2_MASK	(0x1f<<2)
 #define IOMUXC_GPR13_SATA_PHY_1_MASK	(3<<0)
 
+#define IOMUX_GPR1_FEC_CLOCK_MUX1_SEL_MASK (0x3 << 17)
+#define IOMUX_GPR1_FEC_CLOCK_MUX2_SEL_MASK (0x1 << 14)
+#define IOMUX_GPR1_FEC_MASK    (IOMUX_GPR1_FEC_CLOCK_MUX1_SEL_MASK \
+				| IOMUX_GPR1_FEC_CLOCK_MUX2_SEL_MASK)
+
 #define IOMUXC_GPR13_SATA_PHY_8_RXEQ_0P5DB	(0<<24)
 #define IOMUXC_GPR13_SATA_PHY_8_RXEQ_1P0DB	(1<<24)
 #define IOMUXC_GPR13_SATA_PHY_8_RXEQ_1P5DB	(2<<24)

arch/arm/include/asm/arch-mx6/mx6sl_pins.h

@@ -18,5 +18,17 @@ enum {
 	MX6_PAD_SD2_DAT3__USDHC2_DAT3				= IOMUX_PAD(0x0570, 0x0268, 0, 0x0000, 0, 0),
 	MX6_PAD_UART1_RXD__UART1_RXD				= IOMUX_PAD(0x05A0, 0x0298, 0, 0x07FC, 0, 0),
 	MX6_PAD_UART1_TXD__UART1_TXD				= IOMUX_PAD(0x05A4, 0x029C, 0, 0x0000, 0, 0),
+
+	MX6_PAD_FEC_MDC__FEC_MDC				= IOMUX_PAD(0x41c, 0x12c, 0, 0x000, 0, 0),
+	MX6_PAD_FEC_MDIO__FEC_MDIO				= IOMUX_PAD(0x420, 0x130, 0, 0x6f4, 1, 0),
+	MX6_PAD_FEC_CRS_DV__FEC_RX_DV				= IOMUX_PAD(0x418, 0x128, 0, 0x704, 1, 0),
+	MX6_PAD_FEC_RXD0__FEC_RX_DATA0				= IOMUX_PAD(0x42c, 0x13c, 0, 0x6f8, 0, 0),
+	MX6_PAD_FEC_RXD1__FEC_RX_DATA1				= IOMUX_PAD(0x430, 0x140, 0, 0x6fc, 1, 0),
+	MX6_PAD_FEC_TX_EN__FEC_TX_EN				= IOMUX_PAD(0x438, 0x148, 0, 0x000, 0, 0),
+	MX6_PAD_FEC_TXD0__FEC_TX_DATA0				= IOMUX_PAD(0x43c, 0x14c, 0, 0x000, 0, 0),
+	MX6_PAD_FEC_TXD1__FEC_TX_DATA1				= IOMUX_PAD(0x440, 0x150, 0, 0x000, 0, 0),
+	MX6_PAD_FEC_REF_CLK__FEC_REF_OUT			= IOMUX_PAD(0x424, 0x134, 0x10, 0x000, 0, 0),
+	MX6_PAD_FEC_RX_ER__GPIO_4_19				= IOMUX_PAD(0x0428, 0x0138, 5, 0x0000, 0, 0),
+	MX6_PAD_FEC_TX_CLK__GPIO_4_21				= IOMUX_PAD(0x0434, 0x0144, 5, 0x0000, 0, 0),
 };
 #endif	/* __ASM_ARCH_MX6_MX6SL_PINS_H__ */

board/freescale/mx6slevk/mx6slevk.c

@@ -18,6 +18,7 @@
 #include <common.h>
 #include <fsl_esdhc.h>
 #include <mmc.h>
+#include <netdev.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -29,6 +30,12 @@ DECLARE_GLOBAL_DATA_PTR;
 	PAD_CTL_SPEED_LOW | PAD_CTL_DSE_80ohm |			\
 	PAD_CTL_SRE_FAST  | PAD_CTL_HYS)
 
+#define ENET_PAD_CTRL  (PAD_CTL_PKE | PAD_CTL_PUE |             \
+	PAD_CTL_PUS_100K_UP | PAD_CTL_SPEED_MED   |             \
+	PAD_CTL_DSE_40ohm   | PAD_CTL_HYS)
+
+#define ETH_PHY_RESET	IMX_GPIO_NR(4, 21)
+
 int dram_init(void)
 {
 	gd->ram_size = get_ram_size((void *)PHYS_SDRAM, PHYS_SDRAM_SIZE);
@@ -50,11 +57,35 @@ static iomux_v3_cfg_t const usdhc2_pads[] = {
 	MX6_PAD_SD2_DAT3__USDHC2_DAT3 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
 };
 
+static iomux_v3_cfg_t const fec_pads[] = {
+	MX6_PAD_FEC_MDC__FEC_MDC | MUX_PAD_CTRL(ENET_PAD_CTRL),
+	MX6_PAD_FEC_MDIO__FEC_MDIO | MUX_PAD_CTRL(ENET_PAD_CTRL),
+	MX6_PAD_FEC_CRS_DV__FEC_RX_DV | MUX_PAD_CTRL(ENET_PAD_CTRL),
+	MX6_PAD_FEC_RXD0__FEC_RX_DATA0 | MUX_PAD_CTRL(ENET_PAD_CTRL),
+	MX6_PAD_FEC_RXD1__FEC_RX_DATA1 | MUX_PAD_CTRL(ENET_PAD_CTRL),
+	MX6_PAD_FEC_TX_EN__FEC_TX_EN | MUX_PAD_CTRL(ENET_PAD_CTRL),
+	MX6_PAD_FEC_TXD0__FEC_TX_DATA0 | MUX_PAD_CTRL(ENET_PAD_CTRL),
+	MX6_PAD_FEC_TXD1__FEC_TX_DATA1 | MUX_PAD_CTRL(ENET_PAD_CTRL),
+	MX6_PAD_FEC_REF_CLK__FEC_REF_OUT | MUX_PAD_CTRL(ENET_PAD_CTRL),
+	MX6_PAD_FEC_RX_ER__GPIO_4_19 | MUX_PAD_CTRL(NO_PAD_CTRL),
+	MX6_PAD_FEC_TX_CLK__GPIO_4_21 | MUX_PAD_CTRL(NO_PAD_CTRL),
+};
+
 static void setup_iomux_uart(void)
 {
 	imx_iomux_v3_setup_multiple_pads(uart1_pads, ARRAY_SIZE(uart1_pads));
 }
 
+static void setup_iomux_fec(void)
+{
+	imx_iomux_v3_setup_multiple_pads(fec_pads, ARRAY_SIZE(fec_pads));
+
+	/* Reset LAN8720 PHY */
+	gpio_direction_output(ETH_PHY_RESET , 0);
+	udelay(1000);
+	gpio_set_value(ETH_PHY_RESET, 1);
+}
+
 static struct fsl_esdhc_cfg usdhc_cfg[1] = {
 	{USDHC2_BASE_ADDR},
 };
@@ -72,6 +103,40 @@ int board_mmc_init(bd_t *bis)
 	return fsl_esdhc_initialize(bis, &usdhc_cfg[0]);
 }
 
+#ifdef CONFIG_FEC_MXC
+int board_eth_init(bd_t *bis)
+{
+	int ret;
+
+	setup_iomux_fec();
+
+	ret = cpu_eth_init(bis);
+	if (ret) {
+		printf("FEC MXC: %s:failed\n", __func__);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int setup_fec(void)
+{
+	struct iomuxc_base_regs *iomuxc_regs =
+				(struct iomuxc_base_regs *)IOMUXC_BASE_ADDR;
+	int ret;
+
+	/* clear gpr1[14], gpr1[18:17] to select anatop clock */
+	clrsetbits_le32(&iomuxc_regs->gpr[1], IOMUX_GPR1_FEC_MASK, 0);
+
+	ret = enable_fec_anatop_clock();
+	if (ret)
+		return ret;
+
+	return 0;
+}
+#endif
+
+
 int board_early_init_f(void)
 {
 	setup_iomux_uart();
@@ -83,6 +148,9 @@ int board_init(void)
 	/* address of boot parameters */
 	gd->bd->bi_boot_params = PHYS_SDRAM + 0x100;
 
+#ifdef	CONFIG_FEC_MXC
+	setup_fec();
+#endif
 	return 0;
 }
 

include/configs/mx6slevk.h

@@ -44,6 +44,20 @@
 #define CONFIG_CMD_FAT
 #define CONFIG_DOS_PARTITION
 
+#define CONFIG_CMD_PING
+#define CONFIG_CMD_DHCP
+#define CONFIG_CMD_MII
+#define CONFIG_CMD_NET
+#define CONFIG_FEC_MXC
+#define CONFIG_MII
+#define IMX_FEC_BASE			ENET_BASE_ADDR
+#define CONFIG_FEC_XCV_TYPE		RMII
+#define CONFIG_ETHPRIME			"FEC"
+#define CONFIG_FEC_MXC_PHYADDR		0
+
+#define CONFIG_PHYLIB
+#define CONFIG_PHY_SMSC
+
 /* allow to overwrite serial and ethaddr */
 #define CONFIG_ENV_OVERWRITE
 #define CONFIG_CONS_INDEX		1