156 lines
3.8 KiB
C
156 lines
3.8 KiB
C
/*
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* phy-bcm-kona-usb2.c - Broadcom Kona USB2 Phy Driver
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*
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* Copyright (C) 2013 Linaro Limited
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* Matt Porter <mporter@linaro.org>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/phy/phy.h>
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#include <linux/platform_device.h>
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#define OTGCTL (0)
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#define OTGCTL_OTGSTAT2 BIT(31)
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#define OTGCTL_OTGSTAT1 BIT(30)
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#define OTGCTL_PRST_N_SW BIT(11)
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#define OTGCTL_HRESET_N BIT(10)
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#define OTGCTL_UTMI_LINE_STATE1 BIT(9)
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#define OTGCTL_UTMI_LINE_STATE0 BIT(8)
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#define P1CTL (8)
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#define P1CTL_SOFT_RESET BIT(1)
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#define P1CTL_NON_DRIVING BIT(0)
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struct bcm_kona_usb {
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void __iomem *regs;
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};
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static void bcm_kona_usb_phy_power(struct bcm_kona_usb *phy, int on)
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{
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u32 val;
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val = readl(phy->regs + OTGCTL);
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if (on) {
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/* Configure and power PHY */
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val &= ~(OTGCTL_OTGSTAT2 | OTGCTL_OTGSTAT1 |
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OTGCTL_UTMI_LINE_STATE1 | OTGCTL_UTMI_LINE_STATE0);
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val |= OTGCTL_PRST_N_SW | OTGCTL_HRESET_N;
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} else {
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val &= ~(OTGCTL_PRST_N_SW | OTGCTL_HRESET_N);
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}
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writel(val, phy->regs + OTGCTL);
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}
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static int bcm_kona_usb_phy_init(struct phy *gphy)
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{
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struct bcm_kona_usb *phy = phy_get_drvdata(gphy);
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u32 val;
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/* Soft reset PHY */
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val = readl(phy->regs + P1CTL);
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val &= ~P1CTL_NON_DRIVING;
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val |= P1CTL_SOFT_RESET;
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writel(val, phy->regs + P1CTL);
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writel(val & ~P1CTL_SOFT_RESET, phy->regs + P1CTL);
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/* Reset needs to be asserted for 2ms */
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mdelay(2);
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writel(val | P1CTL_SOFT_RESET, phy->regs + P1CTL);
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return 0;
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}
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static int bcm_kona_usb_phy_power_on(struct phy *gphy)
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{
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struct bcm_kona_usb *phy = phy_get_drvdata(gphy);
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bcm_kona_usb_phy_power(phy, 1);
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return 0;
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}
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static int bcm_kona_usb_phy_power_off(struct phy *gphy)
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{
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struct bcm_kona_usb *phy = phy_get_drvdata(gphy);
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bcm_kona_usb_phy_power(phy, 0);
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return 0;
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}
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static const struct phy_ops ops = {
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.init = bcm_kona_usb_phy_init,
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.power_on = bcm_kona_usb_phy_power_on,
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.power_off = bcm_kona_usb_phy_power_off,
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.owner = THIS_MODULE,
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};
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static int bcm_kona_usb2_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct bcm_kona_usb *phy;
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struct resource *res;
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struct phy *gphy;
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struct phy_provider *phy_provider;
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phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
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if (!phy)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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phy->regs = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(phy->regs))
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return PTR_ERR(phy->regs);
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platform_set_drvdata(pdev, phy);
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gphy = devm_phy_create(dev, NULL, &ops);
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if (IS_ERR(gphy))
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return PTR_ERR(gphy);
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/* The Kona PHY supports an 8-bit wide UTMI interface */
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phy_set_bus_width(gphy, 8);
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phy_set_drvdata(gphy, phy);
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phy_provider = devm_of_phy_provider_register(dev,
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of_phy_simple_xlate);
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return PTR_ERR_OR_ZERO(phy_provider);
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}
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static const struct of_device_id bcm_kona_usb2_dt_ids[] = {
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{ .compatible = "brcm,kona-usb2-phy" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, bcm_kona_usb2_dt_ids);
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static struct platform_driver bcm_kona_usb2_driver = {
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.probe = bcm_kona_usb2_probe,
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.driver = {
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.name = "bcm-kona-usb2",
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.of_match_table = bcm_kona_usb2_dt_ids,
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},
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};
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module_platform_driver(bcm_kona_usb2_driver);
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MODULE_ALIAS("platform:bcm-kona-usb2");
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MODULE_AUTHOR("Matt Porter <mporter@linaro.org>");
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MODULE_DESCRIPTION("BCM Kona USB 2.0 PHY driver");
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MODULE_LICENSE("GPL v2");
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