drivers: net: add NXP ENETC MDIO driver
Adds a driver for the MDIO interface currently integrated in LS1028A SoC.
This MDIO interface is shared by multiple ethernet interfaces and is
presented as a stand-alone PCI function on the SoC ECAM.
Ethernet has a functional dependency on MDIO, for simplicity there is a
single config option for both.
Signed-off-by: Alex Marginean <alexm.osslist@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/drivers/net/fsl_enetc_mdio.c b/drivers/net/fsl_enetc_mdio.c
new file mode 100644
index 0000000..46afac0
--- /dev/null
+++ b/drivers/net/fsl_enetc_mdio.c
@@ -0,0 +1,149 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * ENETC ethernet controller driver
+ * Copyright 2019 NXP
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <pci.h>
+#include <miiphy.h>
+#include <asm/io.h>
+#include <asm/processor.h>
+#include <miiphy.h>
+
+#include "fsl_enetc.h"
+
+static void enetc_mdio_wait_bsy(struct enetc_mdio_priv *priv)
+{
+ while (enetc_read(priv, ENETC_MDIO_CFG) & ENETC_EMDIO_CFG_BSY)
+ cpu_relax();
+}
+
+static int enetc_mdio_read_priv(struct enetc_mdio_priv *priv, int addr,
+ int devad, int reg)
+{
+ if (devad == MDIO_DEVAD_NONE)
+ enetc_write(priv, ENETC_MDIO_CFG, ENETC_EMDIO_CFG_C22);
+ else
+ enetc_write(priv, ENETC_MDIO_CFG, ENETC_EMDIO_CFG_C45);
+ enetc_mdio_wait_bsy(priv);
+
+ if (devad == MDIO_DEVAD_NONE) {
+ enetc_write(priv, ENETC_MDIO_CTL, ENETC_MDIO_CTL_READ |
+ (addr << 5) | reg);
+ } else {
+ enetc_write(priv, ENETC_MDIO_CTL, (addr << 5) + devad);
+ enetc_mdio_wait_bsy(priv);
+
+ enetc_write(priv, ENETC_MDIO_STAT, reg);
+ enetc_mdio_wait_bsy(priv);
+
+ enetc_write(priv, ENETC_MDIO_CTL, ENETC_MDIO_CTL_READ |
+ (addr << 5) | devad);
+ }
+
+ enetc_mdio_wait_bsy(priv);
+ if (enetc_read(priv, ENETC_MDIO_CFG) & ENETC_EMDIO_CFG_RD_ER)
+ return ENETC_MDIO_READ_ERR;
+
+ return enetc_read(priv, ENETC_MDIO_DATA);
+}
+
+static int enetc_mdio_write_priv(struct enetc_mdio_priv *priv, int addr,
+ int devad, int reg, u16 val)
+{
+ if (devad == MDIO_DEVAD_NONE)
+ enetc_write(priv, ENETC_MDIO_CFG, ENETC_EMDIO_CFG_C22);
+ else
+ enetc_write(priv, ENETC_MDIO_CFG, ENETC_EMDIO_CFG_C45);
+ enetc_mdio_wait_bsy(priv);
+
+ if (devad != MDIO_DEVAD_NONE) {
+ enetc_write(priv, ENETC_MDIO_CTL, (addr << 5) + devad);
+ enetc_write(priv, ENETC_MDIO_STAT, reg);
+ } else {
+ enetc_write(priv, ENETC_MDIO_CTL, (addr << 5) + reg);
+ }
+ enetc_mdio_wait_bsy(priv);
+
+ enetc_write(priv, ENETC_MDIO_DATA, val);
+ enetc_mdio_wait_bsy(priv);
+
+ return 0;
+}
+
+/* DM wrappers */
+static int dm_enetc_mdio_read(struct udevice *dev, int addr, int devad, int reg)
+{
+ struct enetc_mdio_priv *priv = dev_get_priv(dev);
+
+ return enetc_mdio_read_priv(priv, addr, devad, reg);
+}
+
+static int dm_enetc_mdio_write(struct udevice *dev, int addr, int devad,
+ int reg, u16 val)
+{
+ struct enetc_mdio_priv *priv = dev_get_priv(dev);
+
+ return enetc_mdio_write_priv(priv, addr, devad, reg, val);
+}
+
+static const struct mdio_ops enetc_mdio_ops = {
+ .read = dm_enetc_mdio_read,
+ .write = dm_enetc_mdio_write,
+};
+
+static int enetc_mdio_bind(struct udevice *dev)
+{
+ char name[16];
+ static int eth_num_devices;
+
+ /*
+ * prefer using PCI function numbers to number interfaces, but these
+ * are only available if dts nodes are present. For PCI they are
+ * optional, handle that case too. Just in case some nodes are present
+ * and some are not, use different naming scheme - enetc-N based on
+ * PCI function # and enetc#N based on interface count
+ */
+ if (ofnode_valid(dev->node))
+ sprintf(name, "emdio-%u", PCI_FUNC(pci_get_devfn(dev)));
+ else
+ sprintf(name, "emdio#%u", eth_num_devices++);
+ device_set_name(dev, name);
+
+ return 0;
+}
+
+static int enetc_mdio_probe(struct udevice *dev)
+{
+ struct enetc_mdio_priv *priv = dev_get_priv(dev);
+
+ priv->regs_base = dm_pci_map_bar(dev, PCI_BASE_ADDRESS_0, 0);
+ if (!priv->regs_base) {
+ enetc_dbg(dev, "failed to map BAR0\n");
+ return -EINVAL;
+ }
+
+ priv->regs_base += ENETC_MDIO_BASE;
+
+ dm_pci_clrset_config16(dev, PCI_COMMAND, 0, PCI_COMMAND_MEMORY);
+
+ return 0;
+}
+
+U_BOOT_DRIVER(enetc_mdio) = {
+ .name = "enetc_mdio",
+ .id = UCLASS_MDIO,
+ .bind = enetc_mdio_bind,
+ .probe = enetc_mdio_probe,
+ .ops = &enetc_mdio_ops,
+ .priv_auto_alloc_size = sizeof(struct enetc_mdio_priv),
+};
+
+static struct pci_device_id enetc_mdio_ids[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_FREESCALE, PCI_DEVICE_ID_ENETC_MDIO) },
+};
+
+U_BOOT_PCI_DEVICE(enetc_mdio, enetc_mdio_ids);