| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copyright (C) 2020 NovaTech LLC |
| * George McCollister <george.mccollister@gmail.com> |
| */ |
| |
| #include <linux/bitfield.h> |
| #include <linux/bits.h> |
| #include <linux/mdio.h> |
| #include <linux/module.h> |
| #include <linux/phy.h> |
| #include <linux/if_vlan.h> |
| #include <linux/of.h> |
| #include "xrs700x.h" |
| #include "xrs700x_reg.h" |
| |
| #define XRS_MDIO_IBA0 0x10 |
| #define XRS_MDIO_IBA1 0x11 |
| #define XRS_MDIO_IBD 0x14 |
| |
| #define XRS_IB_READ 0x0 |
| #define XRS_IB_WRITE 0x1 |
| |
| static int xrs700x_mdio_reg_read(void *context, unsigned int reg, |
| unsigned int *val) |
| { |
| struct mdio_device *mdiodev = context; |
| struct device *dev = &mdiodev->dev; |
| u16 uval; |
| int ret; |
| |
| uval = (u16)FIELD_GET(GENMASK(31, 16), reg); |
| |
| ret = mdiobus_write(mdiodev->bus, mdiodev->addr, XRS_MDIO_IBA1, uval); |
| if (ret < 0) { |
| dev_err(dev, "xrs mdiobus_write returned %d\n", ret); |
| return ret; |
| } |
| |
| uval = (u16)((reg & GENMASK(15, 1)) | XRS_IB_READ); |
| |
| ret = mdiobus_write(mdiodev->bus, mdiodev->addr, XRS_MDIO_IBA0, uval); |
| if (ret < 0) { |
| dev_err(dev, "xrs mdiobus_write returned %d\n", ret); |
| return ret; |
| } |
| |
| ret = mdiobus_read(mdiodev->bus, mdiodev->addr, XRS_MDIO_IBD); |
| if (ret < 0) { |
| dev_err(dev, "xrs mdiobus_read returned %d\n", ret); |
| return ret; |
| } |
| |
| *val = (unsigned int)ret; |
| |
| return 0; |
| } |
| |
| static int xrs700x_mdio_reg_write(void *context, unsigned int reg, |
| unsigned int val) |
| { |
| struct mdio_device *mdiodev = context; |
| struct device *dev = &mdiodev->dev; |
| u16 uval; |
| int ret; |
| |
| ret = mdiobus_write(mdiodev->bus, mdiodev->addr, XRS_MDIO_IBD, (u16)val); |
| if (ret < 0) { |
| dev_err(dev, "xrs mdiobus_write returned %d\n", ret); |
| return ret; |
| } |
| |
| uval = (u16)FIELD_GET(GENMASK(31, 16), reg); |
| |
| ret = mdiobus_write(mdiodev->bus, mdiodev->addr, XRS_MDIO_IBA1, uval); |
| if (ret < 0) { |
| dev_err(dev, "xrs mdiobus_write returned %d\n", ret); |
| return ret; |
| } |
| |
| uval = (u16)((reg & GENMASK(15, 1)) | XRS_IB_WRITE); |
| |
| ret = mdiobus_write(mdiodev->bus, mdiodev->addr, XRS_MDIO_IBA0, uval); |
| if (ret < 0) { |
| dev_err(dev, "xrs mdiobus_write returned %d\n", ret); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static const struct regmap_config xrs700x_mdio_regmap_config = { |
| .val_bits = 16, |
| .reg_stride = 2, |
| .reg_bits = 32, |
| .pad_bits = 0, |
| .write_flag_mask = 0, |
| .read_flag_mask = 0, |
| .reg_read = xrs700x_mdio_reg_read, |
| .reg_write = xrs700x_mdio_reg_write, |
| .max_register = XRS_VLAN(VLAN_N_VID - 1), |
| .cache_type = REGCACHE_NONE, |
| .reg_format_endian = REGMAP_ENDIAN_BIG, |
| .val_format_endian = REGMAP_ENDIAN_BIG |
| }; |
| |
| static int xrs700x_mdio_probe(struct mdio_device *mdiodev) |
| { |
| struct xrs700x *priv; |
| int ret; |
| |
| priv = xrs700x_switch_alloc(&mdiodev->dev, mdiodev); |
| if (!priv) |
| return -ENOMEM; |
| |
| priv->regmap = devm_regmap_init(&mdiodev->dev, NULL, mdiodev, |
| &xrs700x_mdio_regmap_config); |
| if (IS_ERR(priv->regmap)) { |
| ret = PTR_ERR(priv->regmap); |
| dev_err(&mdiodev->dev, "Failed to initialize regmap: %d\n", ret); |
| return ret; |
| } |
| |
| dev_set_drvdata(&mdiodev->dev, priv); |
| |
| ret = xrs700x_switch_register(priv); |
| |
| /* Main DSA driver may not be started yet. */ |
| if (ret) |
| return ret; |
| |
| return 0; |
| } |
| |
| static void xrs700x_mdio_remove(struct mdio_device *mdiodev) |
| { |
| struct xrs700x *priv = dev_get_drvdata(&mdiodev->dev); |
| |
| if (!priv) |
| return; |
| |
| xrs700x_switch_remove(priv); |
| |
| dev_set_drvdata(&mdiodev->dev, NULL); |
| } |
| |
| static void xrs700x_mdio_shutdown(struct mdio_device *mdiodev) |
| { |
| struct xrs700x *priv = dev_get_drvdata(&mdiodev->dev); |
| |
| if (!priv) |
| return; |
| |
| xrs700x_switch_shutdown(priv); |
| |
| dev_set_drvdata(&mdiodev->dev, NULL); |
| } |
| |
| static const struct of_device_id __maybe_unused xrs700x_mdio_dt_ids[] = { |
| { .compatible = "arrow,xrs7003e", .data = &xrs7003e_info }, |
| { .compatible = "arrow,xrs7003f", .data = &xrs7003f_info }, |
| { .compatible = "arrow,xrs7004e", .data = &xrs7004e_info }, |
| { .compatible = "arrow,xrs7004f", .data = &xrs7004f_info }, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(of, xrs700x_mdio_dt_ids); |
| |
| static struct mdio_driver xrs700x_mdio_driver = { |
| .mdiodrv.driver = { |
| .name = "xrs700x-mdio", |
| .of_match_table = of_match_ptr(xrs700x_mdio_dt_ids), |
| }, |
| .probe = xrs700x_mdio_probe, |
| .remove = xrs700x_mdio_remove, |
| .shutdown = xrs700x_mdio_shutdown, |
| }; |
| |
| mdio_module_driver(xrs700x_mdio_driver); |
| |
| MODULE_AUTHOR("George McCollister <george.mccollister@gmail.com>"); |
| MODULE_DESCRIPTION("Arrow SpeedChips XRS700x DSA MDIO driver"); |
| MODULE_LICENSE("GPL v2"); |