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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * phy-bcm-kona-usb2.c - Broadcom Kona USB2 Phy Driver4 *5 * Copyright (C) 2013 Linaro Limited6 * Matt Porter <mporter@linaro.org>7 */8 9#include <linux/clk.h>10#include <linux/delay.h>11#include <linux/err.h>12#include <linux/io.h>13#include <linux/module.h>14#include <linux/of.h>15#include <linux/phy/phy.h>16#include <linux/platform_device.h>17 18#define OTGCTL (0)19#define OTGCTL_OTGSTAT2 BIT(31)20#define OTGCTL_OTGSTAT1 BIT(30)21#define OTGCTL_PRST_N_SW BIT(11)22#define OTGCTL_HRESET_N BIT(10)23#define OTGCTL_UTMI_LINE_STATE1 BIT(9)24#define OTGCTL_UTMI_LINE_STATE0 BIT(8)25 26#define P1CTL (8)27#define P1CTL_SOFT_RESET BIT(1)28#define P1CTL_NON_DRIVING BIT(0)29 30struct bcm_kona_usb {31 void __iomem *regs;32};33 34static void bcm_kona_usb_phy_power(struct bcm_kona_usb *phy, int on)35{36 u32 val;37 38 val = readl(phy->regs + OTGCTL);39 if (on) {40 /* Configure and power PHY */41 val &= ~(OTGCTL_OTGSTAT2 | OTGCTL_OTGSTAT1 |42 OTGCTL_UTMI_LINE_STATE1 | OTGCTL_UTMI_LINE_STATE0);43 val |= OTGCTL_PRST_N_SW | OTGCTL_HRESET_N;44 } else {45 val &= ~(OTGCTL_PRST_N_SW | OTGCTL_HRESET_N);46 }47 writel(val, phy->regs + OTGCTL);48}49 50static int bcm_kona_usb_phy_init(struct phy *gphy)51{52 struct bcm_kona_usb *phy = phy_get_drvdata(gphy);53 u32 val;54 55 /* Soft reset PHY */56 val = readl(phy->regs + P1CTL);57 val &= ~P1CTL_NON_DRIVING;58 val |= P1CTL_SOFT_RESET;59 writel(val, phy->regs + P1CTL);60 writel(val & ~P1CTL_SOFT_RESET, phy->regs + P1CTL);61 /* Reset needs to be asserted for 2ms */62 mdelay(2);63 writel(val | P1CTL_SOFT_RESET, phy->regs + P1CTL);64 65 return 0;66}67 68static int bcm_kona_usb_phy_power_on(struct phy *gphy)69{70 struct bcm_kona_usb *phy = phy_get_drvdata(gphy);71 72 bcm_kona_usb_phy_power(phy, 1);73 74 return 0;75}76 77static int bcm_kona_usb_phy_power_off(struct phy *gphy)78{79 struct bcm_kona_usb *phy = phy_get_drvdata(gphy);80 81 bcm_kona_usb_phy_power(phy, 0);82 83 return 0;84}85 86static const struct phy_ops ops = {87 .init = bcm_kona_usb_phy_init,88 .power_on = bcm_kona_usb_phy_power_on,89 .power_off = bcm_kona_usb_phy_power_off,90 .owner = THIS_MODULE,91};92 93static int bcm_kona_usb2_probe(struct platform_device *pdev)94{95 struct device *dev = &pdev->dev;96 struct bcm_kona_usb *phy;97 struct phy *gphy;98 struct phy_provider *phy_provider;99 100 phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);101 if (!phy)102 return -ENOMEM;103 104 phy->regs = devm_platform_ioremap_resource(pdev, 0);105 if (IS_ERR(phy->regs))106 return PTR_ERR(phy->regs);107 108 platform_set_drvdata(pdev, phy);109 110 gphy = devm_phy_create(dev, NULL, &ops);111 if (IS_ERR(gphy))112 return PTR_ERR(gphy);113 114 /* The Kona PHY supports an 8-bit wide UTMI interface */115 phy_set_bus_width(gphy, 8);116 117 phy_set_drvdata(gphy, phy);118 119 phy_provider = devm_of_phy_provider_register(dev,120 of_phy_simple_xlate);121 122 return PTR_ERR_OR_ZERO(phy_provider);123}124 125static const struct of_device_id bcm_kona_usb2_dt_ids[] = {126 { .compatible = "brcm,kona-usb2-phy" },127 { /* sentinel */ }128};129 130MODULE_DEVICE_TABLE(of, bcm_kona_usb2_dt_ids);131 132static struct platform_driver bcm_kona_usb2_driver = {133 .probe = bcm_kona_usb2_probe,134 .driver = {135 .name = "bcm-kona-usb2",136 .of_match_table = bcm_kona_usb2_dt_ids,137 },138};139 140module_platform_driver(bcm_kona_usb2_driver);141 142MODULE_ALIAS("platform:bcm-kona-usb2");143MODULE_AUTHOR("Matt Porter <mporter@linaro.org>");144MODULE_DESCRIPTION("BCM Kona USB 2.0 PHY driver");145MODULE_LICENSE("GPL v2");146