net: Add IPQ40xx MDIO driver

This adds the driver for the IPQ40xx built-in MDIO.
This will be needed to support future PHY driver.

Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Cc: Luka Perkov <luka.perkov@sartura.hr>

diff --git a/MAINTAINERS b/MAINTAINERS
index d5a418d..a80045f 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -242,6 +242,7 @@ F:  include/dt-bindings/reset/qcom,ipq4019-reset.h
 F:     drivers/reset/reset-ipq4019.c
 F:     drivers/phy/phy-qcom-ipq4019-usb.c
 F:     drivers/spi/spi-qup.c
+F:     drivers/net/mdio-ipq4019.c
 
 ARM MARVELL KIRKWOOD ARMADA-XP ARMADA-38X ARMADA-37XX ARMADA-7K/8K
 M:     Stefan Roese <sr@denx.de>

diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 2beec2d..3a5e036 100644 (file)
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -732,6 +732,13 @@ config MDIO_MUX_I2CREG
          an I2C chip.  The board it was developed for uses a mux controlled by
          on-board FPGA which in turn is accessed as a chip over I2C.
 
+config MDIO_IPQ4019
+       bool "Qualcomm IPQ4019 MDIO interface support"
+       depends on DM_MDIO
+       help
+         This driver supports the MDIO interface found in Qualcomm
+         IPQ40xx series Soc-s.
+
 config MVMDIO
        bool "Marvell MDIO interface support"
        depends on DM_MDIO

diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index 9f7a79e..e3bdda3 100644 (file)
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -40,6 +40,7 @@ obj-$(CONFIG_LAN91C96) += lan91c96.o
 obj-$(CONFIG_LPC32XX_ETH) += lpc32xx_eth.o
 obj-$(CONFIG_MACB) += macb.o
 obj-$(CONFIG_MCFFEC) += mcffec.o mcfmii.o
+obj-$(CONFIG_MDIO_IPQ4019) += mdio-ipq4019.o
 obj-$(CONFIG_MDIO_MUX_I2CREG) += mdio_mux_i2creg.o
 obj-$(CONFIG_MDIO_MUX_SANDBOX) += mdio_mux_sandbox.o
 obj-$(CONFIG_MPC8XX_FEC) += mpc8xx_fec.o

diff --git a/drivers/net/mdio-ipq4019.c b/drivers/net/mdio-ipq4019.c
new file mode 100644 (file)
index 0000000..bc68e1d
--- /dev/null
+++ b/drivers/net/mdio-ipq4019.c
@@ -0,0 +1,146 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Qualcomm IPQ4019 MDIO driver
+ *
+ * Copyright (c) 2020 Sartura Ltd.
+ *
+ * Author: Luka Kovacic <luka.kovacic@sartura.hr>
+ * Author: Robert Marko <robert.marko@sartura.hr>
+ *
+ * Based on Linux driver
+ */
+
+#include <asm/io.h>
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <linux/bitops.h>
+#include <linux/iopoll.h>
+#include <miiphy.h>
+#include <phy.h>
+
+#define MDIO_MODE_REG               0x40
+#define MDIO_ADDR_REG               0x44
+#define MDIO_DATA_WRITE_REG         0x48
+#define MDIO_DATA_READ_REG          0x4c
+#define MDIO_CMD_REG                0x50
+#define MDIO_CMD_ACCESS_BUSY        BIT(16)
+#define MDIO_CMD_ACCESS_START       BIT(8)
+#define MDIO_CMD_ACCESS_CODE_READ   0
+#define MDIO_CMD_ACCESS_CODE_WRITE  1
+
+/* 0 = Clause 22, 1 = Clause 45 */
+#define MDIO_MODE_BIT               BIT(8)
+
+#define IPQ4019_MDIO_TIMEOUT    10000
+#define IPQ4019_MDIO_SLEEP      10
+
+struct ipq4019_mdio_priv {
+       phys_addr_t mdio_base;
+};
+
+static int ipq4019_mdio_wait_busy(struct ipq4019_mdio_priv *priv)
+{
+       unsigned int busy;
+
+       return readl_poll_sleep_timeout(priv->mdio_base + MDIO_CMD_REG, busy,
+                                 (busy & MDIO_CMD_ACCESS_BUSY) == 0, IPQ4019_MDIO_SLEEP,
+                                 IPQ4019_MDIO_TIMEOUT);
+}
+
+int ipq4019_mdio_read(struct udevice *dev, int addr, int devad, int reg)
+{
+       struct ipq4019_mdio_priv *priv = dev_get_priv(dev);
+       unsigned int cmd;
+
+       if (ipq4019_mdio_wait_busy(priv))
+               return -ETIMEDOUT;
+
+       /* Issue the phy address and reg */
+       writel((addr << 8) | reg, priv->mdio_base + MDIO_ADDR_REG);
+
+       cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_READ;
+
+       /* Issue read command */
+       writel(cmd, priv->mdio_base + MDIO_CMD_REG);
+
+       /* Wait read complete */
+       if (ipq4019_mdio_wait_busy(priv))
+               return -ETIMEDOUT;
+
+       /* Read and return data */
+       return readl(priv->mdio_base + MDIO_DATA_READ_REG);
+}
+
+int ipq4019_mdio_write(struct udevice *dev, int addr, int devad,
+                                         int reg, u16 val)
+{
+       struct ipq4019_mdio_priv *priv = dev_get_priv(dev);
+       unsigned int cmd;
+
+       if (ipq4019_mdio_wait_busy(priv))
+               return -ETIMEDOUT;
+
+       /* Issue the phy addreass and reg */
+       writel((addr << 8) | reg, priv->mdio_base + MDIO_ADDR_REG);
+
+       /* Issue write data */
+       writel(val, priv->mdio_base + MDIO_DATA_WRITE_REG);
+
+       cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_WRITE;
+
+       /* Issue write command */
+       writel(cmd, priv->mdio_base + MDIO_CMD_REG);
+
+       /* Wait for write complete */
+
+       if (ipq4019_mdio_wait_busy(priv))
+               return -ETIMEDOUT;
+
+       return 0;
+}
+
+static const struct mdio_ops ipq4019_mdio_ops = {
+       .read = ipq4019_mdio_read,
+       .write = ipq4019_mdio_write,
+};
+
+static int ipq4019_mdio_bind(struct udevice *dev)
+{
+       if (ofnode_valid(dev->node))
+               device_set_name(dev, ofnode_get_name(dev->node));
+
+       return 0;
+}
+
+static int ipq4019_mdio_probe(struct udevice *dev)
+{
+       struct ipq4019_mdio_priv *priv = dev_get_priv(dev);
+       unsigned int data;
+
+       priv->mdio_base = dev_read_addr(dev);
+       if (priv->mdio_base == FDT_ADDR_T_NONE)
+               return -EINVAL;
+
+       /* Enter Clause 22 mode */
+       data = readl(priv->mdio_base + MDIO_MODE_REG);
+       data &= ~MDIO_MODE_BIT;
+       writel(data, priv->mdio_base + MDIO_MODE_REG);
+
+       return 0;
+}
+
+static const struct udevice_id ipq4019_mdio_ids[] = {
+       { .compatible = "qcom,ipq4019-mdio", },
+       { }
+};
+
+U_BOOT_DRIVER(ipq4019_mdio) = {
+       .name           = "ipq4019_mdio",
+       .id             = UCLASS_MDIO,
+       .of_match       = ipq4019_mdio_ids,
+       .bind           = ipq4019_mdio_bind,
+       .probe          = ipq4019_mdio_probe,
+       .ops            = &ipq4019_mdio_ops,
+       .priv_auto_alloc_size   = sizeof(struct ipq4019_mdio_priv),
+};