diff options
Diffstat (limited to 'drivers/phy/phy-bcm-nsp-usb3.c')
| -rw-r--r-- | drivers/phy/phy-bcm-nsp-usb3.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/drivers/phy/phy-bcm-nsp-usb3.c b/drivers/phy/phy-bcm-nsp-usb3.c new file mode 100644 index 000000000000..49024eaa5545 --- /dev/null +++ b/drivers/phy/phy-bcm-nsp-usb3.c @@ -0,0 +1,177 @@ +/* + * Copyright (C) 2016 Broadcom + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation version 2. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/mfd/syscon.h> +#include <linux/mdio.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/phy/phy.h> +#include <linux/regmap.h> + +#define NSP_USB3_RST_CTRL_OFFSET 0x3f8 + +/* mdio reg access */ +#define NSP_USB3_PHY_BASE_ADDR_REG 0x1f + +#define NSP_USB3_PHY_PLL30_BLOCK 0x8000 +#define NSP_USB3_PLL_CONTROL 0x01 +#define NSP_USB3_PLLA_CONTROL0 0x0a +#define NSP_USB3_PLLA_CONTROL1 0x0b + +#define NSP_USB3_PHY_TX_PMD_BLOCK 0x8040 +#define NSP_USB3_TX_PMD_CONTROL1 0x01 + +#define NSP_USB3_PHY_PIPE_BLOCK 0x8060 +#define NSP_USB3_LFPS_CMP 0x02 +#define NSP_USB3_LFPS_DEGLITCH 0x03 + +struct nsp_usb3_phy { + struct regmap *usb3_ctrl; + struct phy *phy; + struct mdio_device *mdiodev; +}; + +static int nsp_usb3_phy_init(struct phy *phy) +{ + struct nsp_usb3_phy *iphy = phy_get_drvdata(phy); + struct mii_bus *bus = iphy->mdiodev->bus; + int addr = iphy->mdiodev->addr; + u32 data; + int rc; + + rc = regmap_read(iphy->usb3_ctrl, 0, &data); + if (rc) + return rc; + data |= 1; + rc = regmap_write(iphy->usb3_ctrl, 0, data); + if (rc) + return rc; + + rc = regmap_write(iphy->usb3_ctrl, NSP_USB3_RST_CTRL_OFFSET, 1); + if (rc) + return rc; + + rc = mdiobus_write(bus, addr, NSP_USB3_PHY_BASE_ADDR_REG, + NSP_USB3_PHY_PLL30_BLOCK); + if (rc) + return rc; + + rc = mdiobus_write(bus, addr, NSP_USB3_PLL_CONTROL, 0x1000); + if (rc) + return rc; + + rc = mdiobus_write(bus, addr, NSP_USB3_PLLA_CONTROL0, 0x6400); + if (rc) + return rc; + + rc = mdiobus_write(bus, addr, NSP_USB3_PLLA_CONTROL1, 0xc000); + if (rc) + return rc; + + rc = mdiobus_write(bus, addr, NSP_USB3_PLLA_CONTROL1, 0x8000); + if (rc) + return rc; + + rc = regmap_write(iphy->usb3_ctrl, NSP_USB3_RST_CTRL_OFFSET, 0); + if (rc) + return rc; + + rc = mdiobus_write(bus, addr, NSP_USB3_PLL_CONTROL, 0x9000); + if (rc) + return rc; + + rc = mdiobus_write(bus, addr, NSP_USB3_PHY_BASE_ADDR_REG, + NSP_USB3_PHY_PIPE_BLOCK); + if (rc) + return rc; + + rc = mdiobus_write(bus, addr, NSP_USB3_LFPS_CMP, 0xf30d); + if (rc) + return rc; + + rc = mdiobus_write(bus, addr, NSP_USB3_LFPS_DEGLITCH, 0x6302); + if (rc) + return rc; + + rc = mdiobus_write(bus, addr, NSP_USB3_PHY_BASE_ADDR_REG, + NSP_USB3_PHY_TX_PMD_BLOCK); + if (rc) + return rc; + + rc = mdiobus_write(bus, addr, NSP_USB3_TX_PMD_CONTROL1, 0x1003); + + return rc; +} + +static struct phy_ops nsp_usb3_phy_ops = { + .init = nsp_usb3_phy_init, + .owner = THIS_MODULE, +}; + +static int nsp_usb3_phy_probe(struct mdio_device *mdiodev) +{ + struct device *dev = &mdiodev->dev; + struct phy_provider *provider; + struct nsp_usb3_phy *iphy; + + iphy = devm_kzalloc(dev, sizeof(*iphy), GFP_KERNEL); + if (!iphy) + return -ENOMEM; + iphy->mdiodev = mdiodev; + + iphy->usb3_ctrl = syscon_regmap_lookup_by_phandle(dev->of_node, + "usb3-ctrl-syscon"); + if (IS_ERR(iphy->usb3_ctrl)) + return PTR_ERR(iphy->usb3_ctrl); + + iphy->phy = devm_phy_create(dev, dev->of_node, &nsp_usb3_phy_ops); + if (IS_ERR(iphy->phy)) { + dev_err(dev, "failed to create PHY\n"); + return PTR_ERR(iphy->phy); + } + + phy_set_drvdata(iphy->phy, iphy); + + provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); + if (IS_ERR(provider)) { + dev_err(dev, "could not register PHY provider\n"); + return PTR_ERR(provider); + } + + return 0; +} + +static const struct of_device_id nsp_usb3_phy_of_match[] = { + {.compatible = "brcm,nsp-usb3-phy",}, + { /* sentinel */ } +}; + +static struct mdio_driver nsp_usb3_phy_driver = { + .mdiodrv = { + .driver = { + .name = "nsp-usb3-phy", + .of_match_table = nsp_usb3_phy_of_match, + }, + }, + .probe = nsp_usb3_phy_probe, +}; + +mdio_module_driver(nsp_usb3_phy_driver); + +MODULE_DESCRIPTION("Broadcom NSP USB3 PHY driver"); +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Yendapally Reddy Dhananjaya Reddy <yendapally.reddy@broadcom.com"); |