net: stm32: add designware mac glue code for stm32

This patch adds glue code required for enabling the designware
mac on stm32f7 devices.

Signed-off-by: Michael Kurz <michi.kurz@gmail.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

arch/arm/include/asm/arch-stm32f7/stm32_periph.h

@@ -36,6 +36,7 @@ enum periph_clock {
 	SYSCFG_CLOCK_CFG,
 	TIMER2_CLOCK_CFG,
 	FMC_CLOCK_CFG,
+	STMMAC_CLOCK_CFG,
 };
 
 #endif /* __ASM_ARM_ARCH_PERIPH_H */

arch/arm/include/asm/arch-stm32f7/syscfg.h

@@ -0,0 +1,38 @@
+/*
+ * (C) Copyright 2016
+ * Michael Kurz, michi.kurz@gmail.com.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _STM32_SYSCFG_H
+#define _STM32_SYSCFG_H
+
+struct stm32_syscfg_regs {
+	u32 memrmp;
+	u32 pmc;
+	u32 exticr1;
+	u32 exticr2;
+	u32 exticr3;
+	u32 exticr4;
+	u32 cmpcr;
+};
+
+/*
+ * SYSCFG registers base
+ */
+#define STM32_SYSCFG		((struct stm32_syscfg_regs *)STM32_SYSCFG_BASE)
+
+/* SYSCFG memory remap register */
+#define SYSCFG_MEMRMP_MEM_BOOT	BIT(0)
+#define SYSCFG_MEMRMP_SWP_FMC	BIT(10)
+
+/* SYSCFG peripheral mode configuration register */
+#define SYSCFG_PMC_ADCXDC2	BIT(16)
+#define SYSCFG_PMC_MII_RMII_SEL	BIT(23)
+
+/* Compensation cell control register */
+#define SYSCFG_CMPCR_CMP_PD	BIT(0)
+#define SYSCFG_CMPCR_READY	BIT(8)
+
+#endif

arch/arm/mach-stm32/stm32f7/clock.c

@@ -261,6 +261,11 @@ void clock_setup(int peripheral)
 	case FMC_CLOCK_CFG:
 		setbits_le32(&STM32_RCC->ahb3enr, RCC_AHB3ENR_FMC_EN);
 		break;
+	case STMMAC_CLOCK_CFG:
+		setbits_le32(&STM32_RCC->ahb1enr, RCC_AHB1ENR_ETHMAC_EN);
+		setbits_le32(&STM32_RCC->ahb1enr, RCC_AHB1ENR_ETHMAC_RX_EN);
+		setbits_le32(&STM32_RCC->ahb1enr, RCC_AHB1ENR_ETHMAC_TX_EN);
+		break;
 	default:
 		break;
 	}

board/st/stm32f746-disco/stm32f746-disco.c

@@ -15,6 +15,7 @@
 #include <dm/platform_data/serial_stm32x7.h>
 #include <asm/arch/stm32_periph.h>
 #include <asm/arch/stm32_defs.h>
+#include <asm/arch/syscfg.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -276,6 +277,55 @@ U_BOOT_DEVICE(stm32x7_serials) = {
 	.platdata = &serial_platdata,
 };
 
+#ifdef CONFIG_ETH_DESIGNWARE
+const struct stm32_gpio_ctl gpio_ctl_eth = {
+	.mode = STM32_GPIO_MODE_AF,
+	.otype = STM32_GPIO_OTYPE_PP,
+	.speed = STM32_GPIO_SPEED_100M,
+	.pupd = STM32_GPIO_PUPD_NO,
+	.af = STM32_GPIO_AF11
+};
+
+static const struct stm32_gpio_dsc eth_gpio[] = {
+	{STM32_GPIO_PORT_A, STM32_GPIO_PIN_1},	/* ETH_RMII_REF_CLK */
+	{STM32_GPIO_PORT_A, STM32_GPIO_PIN_2},	/* ETH_MDIO */
+	{STM32_GPIO_PORT_A, STM32_GPIO_PIN_7},	/* ETH_RMII_CRS_DV */
+
+	{STM32_GPIO_PORT_C, STM32_GPIO_PIN_1},	/* ETH_MDC */
+	{STM32_GPIO_PORT_C, STM32_GPIO_PIN_4},	/* ETH_RMII_RXD0 */
+	{STM32_GPIO_PORT_C, STM32_GPIO_PIN_5},	/* ETH_RMII_RXD1 */
+
+	{STM32_GPIO_PORT_G, STM32_GPIO_PIN_11},	/* ETH_RMII_TX_EN */
+	{STM32_GPIO_PORT_G, STM32_GPIO_PIN_13},	/* ETH_RMII_TXD0 */
+	{STM32_GPIO_PORT_G, STM32_GPIO_PIN_14},	/* ETH_RMII_TXD1 */
+};
+
+static int stmmac_setup(void)
+{
+	int res = 0;
+	int i;
+
+	clock_setup(SYSCFG_CLOCK_CFG);
+
+	/* Set >RMII mode */
+	STM32_SYSCFG->pmc |= SYSCFG_PMC_MII_RMII_SEL;
+
+	clock_setup(GPIO_A_CLOCK_CFG);
+	clock_setup(GPIO_C_CLOCK_CFG);
+	clock_setup(GPIO_G_CLOCK_CFG);
+
+	for (i = 0; i < ARRAY_SIZE(eth_gpio); i++) {
+		res = stm32_gpio_config(&eth_gpio[i], &gpio_ctl_eth);
+		if (res)
+			return res;
+	}
+
+	clock_setup(STMMAC_CLOCK_CFG);
+
+	return 0;
+}
+#endif
+
 u32 get_board_rev(void)
 {
 	return 0;
@@ -290,6 +340,12 @@ int board_early_init_f(void)
 	if (res)
 		return res;
 
+#ifdef CONFIG_ETH_DESIGNWARE
+	res = stmmac_setup();
+	if (res)
+		return res;
+#endif
+
 	return 0;
 }
 

configs/stm32f746-disco_defconfig

@@ -14,7 +14,20 @@ CONFIG_AUTOBOOT_KEYED=y
 CONFIG_AUTOBOOT_PROMPT="Hit SPACE in %d seconds to stop autoboot.\n"
 CONFIG_AUTOBOOT_STOP_STR=" "
 # CONFIG_CMD_IMLS is not set
+# CONFIG_CMD_FPGA is not set
 # CONFIG_CMD_SETEXPR is not set
+CONFIG_CMD_DHCP=y
+CONFIG_CMD_MII=y
+CONFIG_CMD_PING=y
+CONFIG_CMD_SNTP=y
+CONFIG_CMD_DNS=y
+CONFIG_CMD_LINK_LOCAL=y
 CONFIG_CMD_TIMER=y
-CONFIG_OF_LIBFDT=y
+CONFIG_OF_CONTROL=y
+CONFIG_NET_RANDOM_ETHADDR=y
+CONFIG_NETCONSOLE=y
+CONFIG_DM_ETH=y
+CONFIG_ETH_DESIGNWARE=y
+# CONFIG_SPL_SERIAL_PRESENT is not set
+CONFIG_OF_LIBFDT_OVERLAY=y
 # CONFIG_EFI_LOADER is not set

drivers/net/designware.c

@@ -763,6 +763,7 @@ static const struct udevice_id designware_eth_ids[] = {
 	{ .compatible = "allwinner,sun7i-a20-gmac" },
 	{ .compatible = "altr,socfpga-stmmac" },
 	{ .compatible = "amlogic,meson6-dwmac" },
+	{ .compatible = "st,stm32-dwmac" },
 	{ }
 };
 

include/configs/stm32f746-disco.h

@@ -40,6 +40,11 @@
 #define CONFIG_STM32_FLASH
 #define CONFIG_STM32X7_SERIAL
 
+#define CONFIG_DESIGNWARE_ETH
+#define CONFIG_DW_GMAC_DEFAULT_DMA_PBL	(8)
+#define CONFIG_DW_ALTDESCRIPTOR
+#define CONFIG_MII
+
 #define CONFIG_STM32_HSE_HZ		25000000
 #define CONFIG_SYS_CLK_FREQ		200000000 /* 200 MHz */
 #define CONFIG_SYS_HZ_CLOCK		1000000	/* Timer is clocked at 1MHz */
@@ -54,8 +59,8 @@
 					+ sizeof(CONFIG_SYS_PROMPT) + 16)
 
 #define CONFIG_SYS_MAXARGS		16
-#define CONFIG_SYS_MALLOC_LEN		(16 * 1024)
-#define CONFIG_STACKSIZE		(64 << 10)
+#define CONFIG_SYS_MALLOC_LEN		(1 * 1024 * 1024)
+#define CONFIG_STACKSIZE		(256 * 1024)
 
 #define CONFIG_BAUDRATE			115200
 #define CONFIG_BOOTARGS							\