net: add Designware Ethernet QoS for STM32MP

We already have Designware NIC support in barebox, but for the DWMAC1000,
the DWMAC4 (also called GMAC4), no support was mainline so far.

The DWMAC4 is different enough that sharing code with the DWMAC1000 is
not really that helpful, because even basics like MDIO registers have
different layout. Instead of coding bit masks and shifts into the driver
data, like Linux does, we'll keep both driver kinds separate.

Nevertheless, we collect functions that are not SoC-specific into a
separate 'library' file.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 84 insertions, 0 deletions

diff --git a/drivers/net/designware_eqos.h b/drivers/net/designware_eqos.h
new file mode 100644
index 0000000000..969a524c0a
--- /dev/null
+++ b/drivers/net/designware_eqos.h
@@ -0,0 +1,84 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2019 Ahmad Fatoum, Pengutronix
+ */
+
+#ifndef __EQOS_H_
+#define __EQOS_H_
+
+struct eqos;
+struct eth_device;
+
+struct eqos_ops {
+	int (*init)(struct device_d *dev, struct eqos *priv);
+	int (*start)(struct eth_device *edev);
+	void (*stop)(struct eth_device *edev);
+	int (*get_ethaddr)(struct eth_device *dev, unsigned char *mac);
+	int (*set_ethaddr)(struct eth_device *edev, const unsigned char *mac);
+	void (*adjust_link)(struct eth_device *edev);
+	unsigned long (*get_csr_clk_rate)(struct eqos *);
+
+	bool enh_desc;
+	int mdio_wait_us;
+
+#define EQOS_MAC_RXQ_CTRL0_RXQ0EN_SHIFT		0
+#define EQOS_MAC_RXQ_CTRL0_RXQ0EN_MASK		3
+#define EQOS_MAC_RXQ_CTRL0_RXQ0EN_NOT_ENABLED	0
+#define EQOS_MAC_RXQ_CTRL0_RXQ0EN_ENABLED_DCB	2
+#define EQOS_MAC_RXQ_CTRL0_RXQ0EN_ENABLED_AV	1
+	unsigned clk_csr;
+
+#define EQOS_MDIO_ADDR_CR_20_35			2
+#define EQOS_MDIO_ADDR_CR_250_300		5
+#define EQOS_MDIO_ADDR_SKAP			BIT(4)
+#define EQOS_MDIO_ADDR_GOC_SHIFT		2
+#define EQOS_MDIO_ADDR_GOC_READ			3
+#define EQOS_MDIO_ADDR_GOC_WRITE		1
+#define EQOS_MDIO_ADDR_C45E			BIT(1)
+	unsigned config_mac;
+};
+
+struct eqos_desc;
+struct eqos_dma_regs;
+struct eqos_mac_regs;
+struct eqos_mtl_regs;
+
+struct eqos {
+	struct eth_device netdev;
+	struct mii_bus miibus;
+
+	u8 macaddr[6];
+
+	u32 tx_currdescnum, rx_currdescnum;
+
+	struct eqos_desc *tx_descs, *rx_descs;
+
+	void __iomem *regs;
+	struct eqos_mac_regs __iomem *mac_regs;
+	struct eqos_dma_regs __iomem *dma_regs;
+	struct eqos_mtl_regs __iomem *mtl_regs;
+
+	int phy_addr;
+	phy_interface_t interface;
+
+	const struct eqos_ops *ops;
+	void *priv;
+	bool started;
+};
+
+struct device_d;
+int eqos_probe(struct device_d *dev, const struct eqos_ops *ops, void *priv);
+void eqos_remove(struct device_d *dev);
+int eqos_reset(struct eqos *priv);
+
+int eqos_get_ethaddr(struct eth_device *edev, unsigned char *mac);
+int eqos_set_ethaddr(struct eth_device *edev, const unsigned char *mac);
+int eqos_start(struct eth_device *edev);
+void eqos_stop(struct eth_device *edev);
+void eqos_adjust_link(struct eth_device *edev);
+
+#define eqos_dbg(eqos, ...) dev_dbg(&eqos->netdev.dev, __VA_ARGS__)
+#define eqos_warn(eqos, ...) dev_warn(&eqos->netdev.dev, __VA_ARGS__)
+#define eqos_err(eqos, ...) dev_err(&eqos->netdev.dev, __VA_ARGS__)
+
+#endif