drivers: net: add Aspeed MDIO driver
Add a driver for the MDIO interface for Aspeed AST2600 SOC. The driver
only supports clause 22 for now.
Signed-off-by: Dylan Hung <dylan_hung@aspeedtech.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
Reviewed-by: Ryan Chen <ryan_chen@aspeedtech.com>
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 8e9109c..e054bec 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -851,6 +851,13 @@
This driver supports the MDIO bus found on the Fman 10G Ethernet MACs and
on the mEMAC (which supports both Clauses 22 and 45).
+config ASPEED_MDIO
+ bool "Aspeed MDIO interface support"
+ depends on DM_MDIO
+ help
+ This driver supports the MDIO bus of Aspeed AST2600 SOC. The driver
+ currently supports Clause 22.
+
config MDIO_MUX_MMIOREG
bool "MDIO MUX accessed as a MMIO register access"
depends on DM_MDIO_MUX
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index 38d0f3f..cf6294c 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -102,3 +102,4 @@
obj-$(CONFIG_MDIO_SANDBOX) += mdio_sandbox.o
obj-$(CONFIG_FSL_ENETC) += fsl_enetc.o fsl_enetc_mdio.o
obj-$(CONFIG_FSL_LS_MDIO) += fsl_ls_mdio.o
+obj-$(CONFIG_ASPEED_MDIO) += aspeed_mdio.o
diff --git a/drivers/net/aspeed_mdio.c b/drivers/net/aspeed_mdio.c
new file mode 100644
index 0000000..a99715a
--- /dev/null
+++ b/drivers/net/aspeed_mdio.c
@@ -0,0 +1,128 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Aspeed MDIO driver
+ *
+ * (C) Copyright 2021 Aspeed Technology Inc.
+ *
+ * This file is inspired from the Linux kernel driver drivers/net/phy/mdio-aspeed.c
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <log.h>
+#include <miiphy.h>
+#include <net.h>
+#include <reset.h>
+#include <linux/bitops.h>
+#include <linux/bitfield.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+
+#define ASPEED_MDIO_CTRL 0x0
+#define ASPEED_MDIO_CTRL_FIRE BIT(31)
+#define ASPEED_MDIO_CTRL_ST BIT(28)
+#define ASPEED_MDIO_CTRL_ST_C45 0
+#define ASPEED_MDIO_CTRL_ST_C22 1
+#define ASPEED_MDIO_CTRL_OP GENMASK(27, 26)
+#define MDIO_C22_OP_WRITE 0b01
+#define MDIO_C22_OP_READ 0b10
+#define ASPEED_MDIO_CTRL_PHYAD GENMASK(25, 21)
+#define ASPEED_MDIO_CTRL_REGAD GENMASK(20, 16)
+#define ASPEED_MDIO_CTRL_MIIWDATA GENMASK(15, 0)
+
+#define ASPEED_MDIO_DATA 0x4
+#define ASPEED_MDIO_DATA_MDC_THRES GENMASK(31, 24)
+#define ASPEED_MDIO_DATA_MDIO_EDGE BIT(23)
+#define ASPEED_MDIO_DATA_MDIO_LATCH GENMASK(22, 20)
+#define ASPEED_MDIO_DATA_IDLE BIT(16)
+#define ASPEED_MDIO_DATA_MIIRDATA GENMASK(15, 0)
+
+#define ASPEED_MDIO_TIMEOUT_US 1000
+
+struct aspeed_mdio_priv {
+ void *base;
+};
+
+static int aspeed_mdio_read(struct udevice *mdio_dev, int addr, int devad, int reg)
+{
+ struct aspeed_mdio_priv *priv = dev_get_priv(mdio_dev);
+ u32 ctrl;
+ u32 data;
+ int rc;
+
+ if (devad != MDIO_DEVAD_NONE)
+ return -EOPNOTSUPP;
+
+ ctrl = ASPEED_MDIO_CTRL_FIRE
+ | FIELD_PREP(ASPEED_MDIO_CTRL_ST, ASPEED_MDIO_CTRL_ST_C22)
+ | FIELD_PREP(ASPEED_MDIO_CTRL_OP, MDIO_C22_OP_READ)
+ | FIELD_PREP(ASPEED_MDIO_CTRL_PHYAD, addr)
+ | FIELD_PREP(ASPEED_MDIO_CTRL_REGAD, reg);
+
+ writel(ctrl, priv->base + ASPEED_MDIO_CTRL);
+
+ rc = readl_poll_timeout(priv->base + ASPEED_MDIO_DATA, data,
+ data & ASPEED_MDIO_DATA_IDLE,
+ ASPEED_MDIO_TIMEOUT_US);
+
+ if (rc < 0)
+ return rc;
+
+ return FIELD_GET(ASPEED_MDIO_DATA_MIIRDATA, data);
+}
+
+static int aspeed_mdio_write(struct udevice *mdio_dev, int addr, int devad, int reg, u16 val)
+{
+ struct aspeed_mdio_priv *priv = dev_get_priv(mdio_dev);
+ u32 ctrl;
+
+ if (devad != MDIO_DEVAD_NONE)
+ return -EOPNOTSUPP;
+
+ ctrl = ASPEED_MDIO_CTRL_FIRE
+ | FIELD_PREP(ASPEED_MDIO_CTRL_ST, ASPEED_MDIO_CTRL_ST_C22)
+ | FIELD_PREP(ASPEED_MDIO_CTRL_OP, MDIO_C22_OP_WRITE)
+ | FIELD_PREP(ASPEED_MDIO_CTRL_PHYAD, addr)
+ | FIELD_PREP(ASPEED_MDIO_CTRL_REGAD, reg)
+ | FIELD_PREP(ASPEED_MDIO_CTRL_MIIWDATA, val);
+
+ writel(ctrl, priv->base + ASPEED_MDIO_CTRL);
+
+ return readl_poll_timeout(priv->base + ASPEED_MDIO_CTRL, ctrl,
+ !(ctrl & ASPEED_MDIO_CTRL_FIRE),
+ ASPEED_MDIO_TIMEOUT_US);
+}
+
+static const struct mdio_ops aspeed_mdio_ops = {
+ .read = aspeed_mdio_read,
+ .write = aspeed_mdio_write,
+};
+
+static int aspeed_mdio_probe(struct udevice *dev)
+{
+ struct aspeed_mdio_priv *priv = dev_get_priv(dev);
+ struct reset_ctl reset_ctl;
+ int ret = 0;
+
+ priv->base = dev_read_addr_ptr(dev);
+
+ ret = reset_get_by_index(dev, 0, &reset_ctl);
+ reset_deassert(&reset_ctl);
+
+ return 0;
+}
+
+static const struct udevice_id aspeed_mdio_ids[] = {
+ { .compatible = "aspeed,ast2600-mdio" },
+ { }
+};
+
+U_BOOT_DRIVER(aspeed_mdio) = {
+ .name = "aspeed_mdio",
+ .id = UCLASS_MDIO,
+ .of_match = aspeed_mdio_ids,
+ .probe = aspeed_mdio_probe,
+ .ops = &aspeed_mdio_ops,
+ .plat_auto = sizeof(struct mdio_perdev_priv),
+ .priv_auto = sizeof(struct aspeed_mdio_priv),
+};