From: Yang Xiwen <forbidden...@outlook.com>
It adds the driver for the internal MDIO bus of HIFEMAC Ethernet
controller. It's based on the mainstream linux driver.
Signed-off-by: Yang Xiwen <forbidden...@outlook.com>
---
drivers/net/Kconfig | 8 ++++
drivers/net/Makefile | 1 +
drivers/net/hifemac_mdio.c | 116 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 125 insertions(+)
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index bc1d6e3905..5c5bfb1263 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -895,6 +895,14 @@ config HIFEMAC_ETH
This driver supports HIFEMAC Ethernet controller found on
HiSilicon SoCs.
+config HIFEMAC_MDIO
+ bool "HiSilicon Fast Ethernet Controller MDIO interface"
+ depends on DM_MDIO
+ select DM_CLK
+ help
+ This driver supports the internal MDIO interface of HIFEMAC
+ Ethernet controller.
+
config HIGMACV300_ETH
bool "HiSilicon Gigabit Ethernet Controller"
select DM_RESET
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index de6bf1d014..b2d3da6934 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -46,6 +46,7 @@ obj-$(CONFIG_FTGMAC100) += ftgmac100.o
obj-$(CONFIG_FTMAC100) += ftmac100.o
obj-$(CONFIG_GMAC_ROCKCHIP) += gmac_rockchip.o
obj-$(CONFIG_HIFEMAC_ETH) += hifemac.o
+obj-$(CONFIG_HIFEMAC_MDIO) += hifemac_mdio.o
obj-$(CONFIG_HIGMACV300_ETH) += higmacv300.o
obj-$(CONFIG_KS8851_MLL) += ks8851_mll.o
obj-$(CONFIG_KSZ9477) += ksz9477.o
diff --git a/drivers/net/hifemac_mdio.c b/drivers/net/hifemac_mdio.c
new file mode 100644
index 0000000000..343c5f3a38
--- /dev/null
+++ b/drivers/net/hifemac_mdio.c
@@ -0,0 +1,116 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Hisilicon Fast Ethernet MDIO Bus Driver
+ *
+ * Copyright (c) 2016 HiSilicon Technologies Co., Ltd.
+ */
+
+#include <dm.h>
+#include <clk.h>
+#include <miiphy.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+
+#define MDIO_RWCTRL 0x00
+#define MDIO_RO_DATA 0x04
+#define MDIO_WRITE BIT(13)
+#define MDIO_RW_FINISH BIT(15)
+#define BIT_PHY_ADDR_OFFSET 8
+#define BIT_WR_DATA_OFFSET 16
+
+struct hisi_femac_mdio_data {
+ struct clk *clk;
+ void __iomem *membase;
+};
+
+static int hisi_femac_mdio_wait_ready(struct hisi_femac_mdio_data *data)
+{
+ u32 val;
+
+ return readl_poll_timeout(data->membase + MDIO_RWCTRL,
+ val, val & MDIO_RW_FINISH, 10000);
+}
+
+static int hisi_femac_mdio_read(struct udevice *dev, int addr, int devad, int
reg)
+{
+ struct hisi_femac_mdio_data *data = dev_get_priv(dev);
+ int ret;
+
+ ret = hisi_femac_mdio_wait_ready(data);
+ if (ret)
+ return ret;
+
+ writel((addr << BIT_PHY_ADDR_OFFSET) | reg,
+ data->membase + MDIO_RWCTRL);
+
+ ret = hisi_femac_mdio_wait_ready(data);
+ if (ret)
+ return ret;
+
+ return readl(data->membase + MDIO_RO_DATA) & 0xFFFF;
+}
+
+static int hisi_femac_mdio_write(struct udevice *dev, int addr, int devad, int
reg, u16 val)
+{
+ struct hisi_femac_mdio_data *data = dev_get_priv(dev);
+ int ret;
+
+ ret = hisi_femac_mdio_wait_ready(data);
+ if (ret)
+ return ret;
+
+ writel(MDIO_WRITE | (val << BIT_WR_DATA_OFFSET) |
+ (addr << BIT_PHY_ADDR_OFFSET) | reg,
+ data->membase + MDIO_RWCTRL);
+
+ return hisi_femac_mdio_wait_ready(data);
+}
+
+static int hisi_femac_mdio_of_to_plat(struct udevice *dev)
+{
+ struct hisi_femac_mdio_data *data = dev_get_priv(dev);
+ int ret;
+
+ data->membase = dev_remap_addr(dev);
+ if (IS_ERR(data->membase)) {
+ ret = PTR_ERR(data->membase);
+ return log_msg_ret("Failed to remap base addr", ret);
+ }
+
+ // clk is optional
+ data->clk = devm_clk_get_optional(dev, NULL);
+
+ return 0;
+}
+
+static int hisi_femac_mdio_probe(struct udevice *dev)
+{
+ struct hisi_femac_mdio_data *data = dev_get_priv(dev);
+ int ret;
+
+ ret = clk_prepare_enable(data->clk);
+ if (ret)
+ return log_msg_ret("Failed to enable clk", ret);
+
+ return 0;
+}
+
+static const struct mdio_ops hisi_femac_mdio_ops = {
+ .read = hisi_femac_mdio_read,
+ .write = hisi_femac_mdio_write,
+};
+
+static const struct udevice_id hisi_femac_mdio_dt_ids[] = {
+ { .compatible = "hisilicon,hisi-femac-mdio" },
+ { }
+};
+
+U_BOOT_DRIVER(hisi_femac_mdio_driver) = {
+ .name = "hisi-femac-mdio",
+ .id = UCLASS_MDIO,
+ .of_match = hisi_femac_mdio_dt_ids,
+ .of_to_plat = hisi_femac_mdio_of_to_plat,
+ .probe = hisi_femac_mdio_probe,
+ .ops = &hisi_femac_mdio_ops,
+ .priv_auto = sizeof(struct hisi_femac_mdio_data),
+};
--
2.34.1
