440 lines
10 KiB
C
440 lines
10 KiB
C
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/*
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* omap-usb2.c - USB PHY, talking to musb controller in OMAP.
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*
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* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* Author: Kishon Vijay Abraham I <kishon@ti.com>
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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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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/io.h>
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#include <linux/phy/omap_usb.h>
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#include <linux/usb/phy_companion.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/pm_runtime.h>
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#include <linux/delay.h>
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#include <linux/phy/omap_control_phy.h>
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#include <linux/phy/phy.h>
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#include <linux/mfd/syscon.h>
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#include <linux/regmap.h>
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#include <linux/of_platform.h>
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#define USB2PHY_DISCON_BYP_LATCH (1 << 31)
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#define USB2PHY_ANA_CONFIG1 0x4c
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/**
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* omap_usb2_set_comparator - links the comparator present in the sytem with
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* this phy
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* @comparator - the companion phy(comparator) for this phy
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*
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* The phy companion driver should call this API passing the phy_companion
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* filled with set_vbus and start_srp to be used by usb phy.
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*
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* For use by phy companion driver
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*/
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int omap_usb2_set_comparator(struct phy_companion *comparator)
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{
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struct omap_usb *phy;
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struct usb_phy *x = usb_get_phy(USB_PHY_TYPE_USB2);
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if (IS_ERR(x))
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return -ENODEV;
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phy = phy_to_omapusb(x);
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phy->comparator = comparator;
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return 0;
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}
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EXPORT_SYMBOL_GPL(omap_usb2_set_comparator);
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static int omap_usb_set_vbus(struct usb_otg *otg, bool enabled)
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{
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struct omap_usb *phy = phy_to_omapusb(otg->usb_phy);
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if (!phy->comparator)
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return -ENODEV;
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return phy->comparator->set_vbus(phy->comparator, enabled);
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}
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static int omap_usb_start_srp(struct usb_otg *otg)
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{
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struct omap_usb *phy = phy_to_omapusb(otg->usb_phy);
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if (!phy->comparator)
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return -ENODEV;
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return phy->comparator->start_srp(phy->comparator);
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}
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static int omap_usb_set_host(struct usb_otg *otg, struct usb_bus *host)
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{
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otg->host = host;
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if (!host)
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otg->state = OTG_STATE_UNDEFINED;
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return 0;
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}
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static int omap_usb_set_peripheral(struct usb_otg *otg,
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struct usb_gadget *gadget)
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{
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otg->gadget = gadget;
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if (!gadget)
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otg->state = OTG_STATE_UNDEFINED;
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return 0;
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}
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static int omap_usb_phy_power(struct omap_usb *phy, int on)
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{
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u32 val;
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int ret;
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if (!phy->syscon_phy_power) {
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omap_control_phy_power(phy->control_dev, on);
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return 0;
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}
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if (on)
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val = phy->power_on;
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else
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val = phy->power_off;
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ret = regmap_update_bits(phy->syscon_phy_power, phy->power_reg,
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phy->mask, val);
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return ret;
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}
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static int omap_usb_power_off(struct phy *x)
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{
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struct omap_usb *phy = phy_get_drvdata(x);
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return omap_usb_phy_power(phy, false);
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}
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static int omap_usb_power_on(struct phy *x)
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{
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struct omap_usb *phy = phy_get_drvdata(x);
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return omap_usb_phy_power(phy, true);
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}
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static int omap_usb2_disable_clocks(struct omap_usb *phy)
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{
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clk_disable(phy->wkupclk);
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if (!IS_ERR(phy->optclk))
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clk_disable(phy->optclk);
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return 0;
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}
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static int omap_usb2_enable_clocks(struct omap_usb *phy)
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{
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int ret;
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ret = clk_enable(phy->wkupclk);
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if (ret < 0) {
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dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
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goto err0;
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}
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if (!IS_ERR(phy->optclk)) {
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ret = clk_enable(phy->optclk);
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if (ret < 0) {
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dev_err(phy->dev, "Failed to enable optclk %d\n", ret);
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goto err1;
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}
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}
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return 0;
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err1:
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clk_disable(phy->wkupclk);
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err0:
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return ret;
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}
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static int omap_usb_init(struct phy *x)
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{
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struct omap_usb *phy = phy_get_drvdata(x);
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u32 val;
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omap_usb2_enable_clocks(phy);
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if (phy->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
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/*
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*
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* Reduce the sensitivity of internal PHY by enabling the
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* DISCON_BYP_LATCH of the USB2PHY_ANA_CONFIG1 register. This
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* resolves issues with certain devices which can otherwise
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* be prone to false disconnects.
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*
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*/
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val = omap_usb_readl(phy->phy_base, USB2PHY_ANA_CONFIG1);
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val |= USB2PHY_DISCON_BYP_LATCH;
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omap_usb_writel(phy->phy_base, USB2PHY_ANA_CONFIG1, val);
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}
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return 0;
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}
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static int omap_usb_exit(struct phy *x)
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{
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struct omap_usb *phy = phy_get_drvdata(x);
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return omap_usb2_disable_clocks(phy);
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}
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static const struct phy_ops ops = {
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.init = omap_usb_init,
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.exit = omap_usb_exit,
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.power_on = omap_usb_power_on,
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.power_off = omap_usb_power_off,
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.owner = THIS_MODULE,
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};
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static const struct usb_phy_data omap_usb2_data = {
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.label = "omap_usb2",
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.flags = OMAP_USB2_HAS_START_SRP | OMAP_USB2_HAS_SET_VBUS,
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.mask = OMAP_DEV_PHY_PD,
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.power_off = OMAP_DEV_PHY_PD,
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};
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static const struct usb_phy_data omap5_usb2_data = {
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.label = "omap5_usb2",
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.flags = 0,
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.mask = OMAP_DEV_PHY_PD,
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.power_off = OMAP_DEV_PHY_PD,
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};
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static const struct usb_phy_data dra7x_usb2_data = {
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.label = "dra7x_usb2",
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.flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
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.mask = OMAP_DEV_PHY_PD,
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.power_off = OMAP_DEV_PHY_PD,
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};
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static const struct usb_phy_data dra7x_usb2_phy2_data = {
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.label = "dra7x_usb2_phy2",
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.flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
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.mask = OMAP_USB2_PHY_PD,
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.power_off = OMAP_USB2_PHY_PD,
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};
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static const struct usb_phy_data am437x_usb2_data = {
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.label = "am437x_usb2",
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.flags = 0,
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.mask = AM437X_USB2_PHY_PD | AM437X_USB2_OTG_PD |
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AM437X_USB2_OTGVDET_EN | AM437X_USB2_OTGSESSEND_EN,
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.power_on = AM437X_USB2_OTGVDET_EN | AM437X_USB2_OTGSESSEND_EN,
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.power_off = AM437X_USB2_PHY_PD | AM437X_USB2_OTG_PD,
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};
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static const struct of_device_id omap_usb2_id_table[] = {
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{
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.compatible = "ti,omap-usb2",
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.data = &omap_usb2_data,
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},
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{
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.compatible = "ti,omap5-usb2",
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.data = &omap5_usb2_data,
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},
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{
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.compatible = "ti,dra7x-usb2",
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.data = &dra7x_usb2_data,
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},
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{
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.compatible = "ti,dra7x-usb2-phy2",
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.data = &dra7x_usb2_phy2_data,
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},
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{
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.compatible = "ti,am437x-usb2",
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.data = &am437x_usb2_data,
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, omap_usb2_id_table);
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static int omap_usb2_probe(struct platform_device *pdev)
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{
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struct omap_usb *phy;
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struct phy *generic_phy;
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struct resource *res;
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struct phy_provider *phy_provider;
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struct usb_otg *otg;
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struct device_node *node = pdev->dev.of_node;
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struct device_node *control_node;
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struct platform_device *control_pdev;
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const struct of_device_id *of_id;
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struct usb_phy_data *phy_data;
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of_id = of_match_device(omap_usb2_id_table, &pdev->dev);
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if (!of_id)
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return -EINVAL;
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phy_data = (struct usb_phy_data *)of_id->data;
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phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
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if (!phy)
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return -ENOMEM;
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otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
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if (!otg)
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return -ENOMEM;
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phy->dev = &pdev->dev;
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phy->phy.dev = phy->dev;
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phy->phy.label = phy_data->label;
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phy->phy.otg = otg;
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phy->phy.type = USB_PHY_TYPE_USB2;
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phy->mask = phy_data->mask;
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phy->power_on = phy_data->power_on;
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phy->power_off = phy_data->power_off;
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if (phy_data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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phy->phy_base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(phy->phy_base))
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return PTR_ERR(phy->phy_base);
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phy->flags |= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT;
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}
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phy->syscon_phy_power = syscon_regmap_lookup_by_phandle(node,
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"syscon-phy-power");
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if (IS_ERR(phy->syscon_phy_power)) {
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dev_dbg(&pdev->dev,
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"can't get syscon-phy-power, using control device\n");
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phy->syscon_phy_power = NULL;
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control_node = of_parse_phandle(node, "ctrl-module", 0);
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if (!control_node) {
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dev_err(&pdev->dev,
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"Failed to get control device phandle\n");
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return -EINVAL;
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}
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control_pdev = of_find_device_by_node(control_node);
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if (!control_pdev) {
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dev_err(&pdev->dev, "Failed to get control device\n");
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return -EINVAL;
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}
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phy->control_dev = &control_pdev->dev;
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} else {
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if (of_property_read_u32_index(node,
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"syscon-phy-power", 1,
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&phy->power_reg)) {
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dev_err(&pdev->dev,
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"couldn't get power reg. offset\n");
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return -EINVAL;
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}
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}
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otg->set_host = omap_usb_set_host;
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otg->set_peripheral = omap_usb_set_peripheral;
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if (phy_data->flags & OMAP_USB2_HAS_SET_VBUS)
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otg->set_vbus = omap_usb_set_vbus;
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if (phy_data->flags & OMAP_USB2_HAS_START_SRP)
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otg->start_srp = omap_usb_start_srp;
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otg->usb_phy = &phy->phy;
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platform_set_drvdata(pdev, phy);
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pm_runtime_enable(phy->dev);
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generic_phy = devm_phy_create(phy->dev, NULL, &ops);
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if (IS_ERR(generic_phy)) {
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pm_runtime_disable(phy->dev);
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return PTR_ERR(generic_phy);
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}
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phy_set_drvdata(generic_phy, phy);
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omap_usb_power_off(generic_phy);
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|
||
|
|
phy_provider = devm_of_phy_provider_register(phy->dev,
|
||
|
|
of_phy_simple_xlate);
|
||
|
|
if (IS_ERR(phy_provider)) {
|
||
|
|
pm_runtime_disable(phy->dev);
|
||
|
|
return PTR_ERR(phy_provider);
|
||
|
|
}
|
||
|
|
|
||
|
|
phy->wkupclk = devm_clk_get(phy->dev, "wkupclk");
|
||
|
|
if (IS_ERR(phy->wkupclk)) {
|
||
|
|
dev_warn(&pdev->dev, "unable to get wkupclk, trying old name\n");
|
||
|
|
phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k");
|
||
|
|
if (IS_ERR(phy->wkupclk)) {
|
||
|
|
dev_err(&pdev->dev, "unable to get usb_phy_cm_clk32k\n");
|
||
|
|
pm_runtime_disable(phy->dev);
|
||
|
|
return PTR_ERR(phy->wkupclk);
|
||
|
|
} else {
|
||
|
|
dev_warn(&pdev->dev,
|
||
|
|
"found usb_phy_cm_clk32k, please fix DTS\n");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
clk_prepare(phy->wkupclk);
|
||
|
|
|
||
|
|
phy->optclk = devm_clk_get(phy->dev, "refclk");
|
||
|
|
if (IS_ERR(phy->optclk)) {
|
||
|
|
dev_dbg(&pdev->dev, "unable to get refclk, trying old name\n");
|
||
|
|
phy->optclk = devm_clk_get(phy->dev, "usb_otg_ss_refclk960m");
|
||
|
|
if (IS_ERR(phy->optclk)) {
|
||
|
|
dev_dbg(&pdev->dev,
|
||
|
|
"unable to get usb_otg_ss_refclk960m\n");
|
||
|
|
} else {
|
||
|
|
dev_warn(&pdev->dev,
|
||
|
|
"found usb_otg_ss_refclk960m, please fix DTS\n");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!IS_ERR(phy->optclk))
|
||
|
|
clk_prepare(phy->optclk);
|
||
|
|
|
||
|
|
usb_add_phy_dev(&phy->phy);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int omap_usb2_remove(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
struct omap_usb *phy = platform_get_drvdata(pdev);
|
||
|
|
|
||
|
|
clk_unprepare(phy->wkupclk);
|
||
|
|
if (!IS_ERR(phy->optclk))
|
||
|
|
clk_unprepare(phy->optclk);
|
||
|
|
usb_remove_phy(&phy->phy);
|
||
|
|
pm_runtime_disable(phy->dev);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct platform_driver omap_usb2_driver = {
|
||
|
|
.probe = omap_usb2_probe,
|
||
|
|
.remove = omap_usb2_remove,
|
||
|
|
.driver = {
|
||
|
|
.name = "omap-usb2",
|
||
|
|
.of_match_table = omap_usb2_id_table,
|
||
|
|
},
|
||
|
|
};
|
||
|
|
|
||
|
|
module_platform_driver(omap_usb2_driver);
|
||
|
|
|
||
|
|
MODULE_ALIAS("platform:omap_usb2");
|
||
|
|
MODULE_AUTHOR("Texas Instruments Inc.");
|
||
|
|
MODULE_DESCRIPTION("OMAP USB2 phy driver");
|
||
|
|
MODULE_LICENSE("GPL v2");
|