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145 lines
3.3 KiB
145 lines
3.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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 <[email protected]> |
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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 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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phy->regs = devm_platform_ioremap_resource(pdev, 0); |
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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 <[email protected]>"); |
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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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