510 lines
12 KiB
C
510 lines
12 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* host.c - ChipIdea USB host controller driver
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*
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* Copyright (c) 2012 Intel Corporation
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*
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* Author: Alexander Shishkin
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*/
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#include <linux/kernel.h>
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#include <linux/io.h>
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#include <linux/usb.h>
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#include <linux/usb/hcd.h>
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#include <linux/usb/chipidea.h>
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#include <linux/regulator/consumer.h>
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#include <linux/pinctrl/consumer.h>
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#include "../host/ehci.h"
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#include "ci.h"
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#include "bits.h"
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#include "host.h"
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static struct hc_driver __read_mostly ci_ehci_hc_driver;
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static int (*orig_bus_suspend)(struct usb_hcd *hcd);
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struct ehci_ci_priv {
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struct regulator *reg_vbus;
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bool enabled;
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};
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struct ci_hdrc_dma_aligned_buffer {
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void *kmalloc_ptr;
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void *old_xfer_buffer;
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u8 data[];
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};
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static int ehci_ci_portpower(struct usb_hcd *hcd, int portnum, bool enable)
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{
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struct ehci_hcd *ehci = hcd_to_ehci(hcd);
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struct ehci_ci_priv *priv = (struct ehci_ci_priv *)ehci->priv;
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struct device *dev = hcd->self.controller;
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struct ci_hdrc *ci = dev_get_drvdata(dev);
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int ret = 0;
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int port = HCS_N_PORTS(ehci->hcs_params);
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if (priv->reg_vbus && enable != priv->enabled) {
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if (port > 1) {
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dev_warn(dev,
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"Not support multi-port regulator control\n");
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return 0;
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}
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if (enable)
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ret = regulator_enable(priv->reg_vbus);
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else
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ret = regulator_disable(priv->reg_vbus);
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if (ret) {
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dev_err(dev,
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"Failed to %s vbus regulator, ret=%d\n",
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enable ? "enable" : "disable", ret);
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return ret;
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}
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priv->enabled = enable;
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}
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if (ci->platdata->flags & CI_HDRC_PHY_VBUS_CONTROL) {
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if (enable)
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usb_phy_vbus_on(ci->usb_phy);
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else
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usb_phy_vbus_off(ci->usb_phy);
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}
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if (enable && (ci->platdata->phy_mode == USBPHY_INTERFACE_MODE_HSIC)) {
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/*
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* Marvell 28nm HSIC PHY requires forcing the port to HS mode.
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* As HSIC is always HS, this should be safe for others.
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*/
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hw_port_test_set(ci, 5);
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hw_port_test_set(ci, 0);
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}
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return 0;
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};
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static int ehci_ci_reset(struct usb_hcd *hcd)
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{
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struct device *dev = hcd->self.controller;
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struct ci_hdrc *ci = dev_get_drvdata(dev);
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struct ehci_hcd *ehci = hcd_to_ehci(hcd);
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int ret;
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ret = ehci_setup(hcd);
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if (ret)
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return ret;
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ehci->need_io_watchdog = 0;
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if (ci->platdata->notify_event) {
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ret = ci->platdata->notify_event(ci,
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CI_HDRC_CONTROLLER_RESET_EVENT);
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if (ret)
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return ret;
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}
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ci_platform_configure(ci);
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return ret;
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}
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static const struct ehci_driver_overrides ehci_ci_overrides = {
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.extra_priv_size = sizeof(struct ehci_ci_priv),
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.port_power = ehci_ci_portpower,
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.reset = ehci_ci_reset,
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};
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static irqreturn_t host_irq(struct ci_hdrc *ci)
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{
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return usb_hcd_irq(ci->irq, ci->hcd);
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}
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static int host_start(struct ci_hdrc *ci)
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{
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struct usb_hcd *hcd;
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struct ehci_hcd *ehci;
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struct ehci_ci_priv *priv;
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int ret;
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if (usb_disabled())
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return -ENODEV;
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hcd = __usb_create_hcd(&ci_ehci_hc_driver, ci->dev->parent,
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ci->dev, dev_name(ci->dev), NULL);
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if (!hcd)
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return -ENOMEM;
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dev_set_drvdata(ci->dev, ci);
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hcd->rsrc_start = ci->hw_bank.phys;
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hcd->rsrc_len = ci->hw_bank.size;
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hcd->regs = ci->hw_bank.abs;
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hcd->has_tt = 1;
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hcd->power_budget = ci->platdata->power_budget;
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hcd->tpl_support = ci->platdata->tpl_support;
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if (ci->phy || ci->usb_phy) {
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hcd->skip_phy_initialization = 1;
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if (ci->usb_phy)
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hcd->usb_phy = ci->usb_phy;
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}
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ehci = hcd_to_ehci(hcd);
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ehci->caps = ci->hw_bank.cap;
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ehci->has_hostpc = ci->hw_bank.lpm;
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ehci->has_tdi_phy_lpm = ci->hw_bank.lpm;
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ehci->imx28_write_fix = ci->imx28_write_fix;
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priv = (struct ehci_ci_priv *)ehci->priv;
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priv->reg_vbus = NULL;
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if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci)) {
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if (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON) {
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ret = regulator_enable(ci->platdata->reg_vbus);
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if (ret) {
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dev_err(ci->dev,
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"Failed to enable vbus regulator, ret=%d\n",
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ret);
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goto put_hcd;
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}
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} else {
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priv->reg_vbus = ci->platdata->reg_vbus;
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}
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}
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if (ci->platdata->pins_host)
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pinctrl_select_state(ci->platdata->pctl,
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ci->platdata->pins_host);
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ci->hcd = hcd;
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ret = usb_add_hcd(hcd, 0, 0);
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if (ret) {
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ci->hcd = NULL;
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goto disable_reg;
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} else {
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struct usb_otg *otg = &ci->otg;
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if (ci_otg_is_fsm_mode(ci)) {
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otg->host = &hcd->self;
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hcd->self.otg_port = 1;
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}
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if (ci->platdata->notify_event &&
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(ci->platdata->flags & CI_HDRC_IMX_IS_HSIC))
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ci->platdata->notify_event
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(ci, CI_HDRC_IMX_HSIC_ACTIVE_EVENT);
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}
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return ret;
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disable_reg:
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if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
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(ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
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regulator_disable(ci->platdata->reg_vbus);
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put_hcd:
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usb_put_hcd(hcd);
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return ret;
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}
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static void host_stop(struct ci_hdrc *ci)
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{
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struct usb_hcd *hcd = ci->hcd;
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if (hcd) {
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if (ci->platdata->notify_event)
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ci->platdata->notify_event(ci,
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CI_HDRC_CONTROLLER_STOPPED_EVENT);
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usb_remove_hcd(hcd);
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ci->role = CI_ROLE_END;
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synchronize_irq(ci->irq);
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usb_put_hcd(hcd);
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if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
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(ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
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regulator_disable(ci->platdata->reg_vbus);
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}
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ci->hcd = NULL;
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ci->otg.host = NULL;
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if (ci->platdata->pins_host && ci->platdata->pins_default)
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pinctrl_select_state(ci->platdata->pctl,
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ci->platdata->pins_default);
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}
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void ci_hdrc_host_destroy(struct ci_hdrc *ci)
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{
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if (ci->role == CI_ROLE_HOST && ci->hcd)
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host_stop(ci);
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}
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/* The below code is based on tegra ehci driver */
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static int ci_ehci_hub_control(
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struct usb_hcd *hcd,
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u16 typeReq,
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u16 wValue,
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u16 wIndex,
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char *buf,
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u16 wLength
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)
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{
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struct ehci_hcd *ehci = hcd_to_ehci(hcd);
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unsigned int ports = HCS_N_PORTS(ehci->hcs_params);
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u32 __iomem *status_reg;
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u32 temp, port_index;
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unsigned long flags;
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int retval = 0;
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bool done = false;
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struct device *dev = hcd->self.controller;
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struct ci_hdrc *ci = dev_get_drvdata(dev);
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port_index = wIndex & 0xff;
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port_index -= (port_index > 0);
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status_reg = &ehci->regs->port_status[port_index];
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spin_lock_irqsave(&ehci->lock, flags);
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if (ci->platdata->hub_control) {
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retval = ci->platdata->hub_control(ci, typeReq, wValue, wIndex,
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buf, wLength, &done, &flags);
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if (done)
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goto done;
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}
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if (typeReq == SetPortFeature && wValue == USB_PORT_FEAT_SUSPEND) {
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if (!wIndex || wIndex > ports) {
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retval = -EPIPE;
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goto done;
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}
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temp = ehci_readl(ehci, status_reg);
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if ((temp & PORT_PE) == 0 || (temp & PORT_RESET) != 0) {
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retval = -EPIPE;
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goto done;
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}
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temp &= ~(PORT_RWC_BITS | PORT_WKCONN_E);
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temp |= PORT_WKDISC_E | PORT_WKOC_E;
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ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
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/*
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* If a transaction is in progress, there may be a delay in
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* suspending the port. Poll until the port is suspended.
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*/
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if (ehci_handshake(ehci, status_reg, PORT_SUSPEND,
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PORT_SUSPEND, 5000))
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ehci_err(ehci, "timeout waiting for SUSPEND\n");
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if (ci->platdata->flags & CI_HDRC_IMX_IS_HSIC) {
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if (ci->platdata->notify_event)
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ci->platdata->notify_event(ci,
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CI_HDRC_IMX_HSIC_SUSPEND_EVENT);
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temp = ehci_readl(ehci, status_reg);
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temp &= ~(PORT_WKDISC_E | PORT_WKCONN_E);
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ehci_writel(ehci, temp, status_reg);
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}
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set_bit(port_index, &ehci->suspended_ports);
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goto done;
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}
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/*
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* After resume has finished, it needs do some post resume
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* operation for some SoCs.
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*/
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else if (typeReq == ClearPortFeature &&
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wValue == USB_PORT_FEAT_C_SUSPEND) {
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/* Make sure the resume has finished, it should be finished */
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if (ehci_handshake(ehci, status_reg, PORT_RESUME, 0, 25000))
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ehci_err(ehci, "timeout waiting for resume\n");
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}
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spin_unlock_irqrestore(&ehci->lock, flags);
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/* Handle the hub control events here */
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return ehci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
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done:
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spin_unlock_irqrestore(&ehci->lock, flags);
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return retval;
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}
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static int ci_ehci_bus_suspend(struct usb_hcd *hcd)
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{
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struct ehci_hcd *ehci = hcd_to_ehci(hcd);
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struct device *dev = hcd->self.controller;
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struct ci_hdrc *ci = dev_get_drvdata(dev);
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int port;
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u32 tmp;
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int ret = orig_bus_suspend(hcd);
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if (ret)
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return ret;
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port = HCS_N_PORTS(ehci->hcs_params);
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while (port--) {
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u32 __iomem *reg = &ehci->regs->port_status[port];
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u32 portsc = ehci_readl(ehci, reg);
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if (portsc & PORT_CONNECT) {
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/*
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* For chipidea, the resume signal will be ended
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* automatically, so for remote wakeup case, the
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* usbcmd.rs may not be set before the resume has
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* ended if other resume paths consumes too much
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* time (~24ms), in that case, the SOF will not
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* send out within 3ms after resume ends, then the
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* high speed device will enter full speed mode.
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*/
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tmp = ehci_readl(ehci, &ehci->regs->command);
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tmp |= CMD_RUN;
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ehci_writel(ehci, tmp, &ehci->regs->command);
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/*
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* It needs a short delay between set RS bit and PHCD.
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*/
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usleep_range(150, 200);
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/*
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* Need to clear WKCN and WKOC for imx HSIC,
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||
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|
* otherwise, there will be wakeup event.
|
||
|
|
*/
|
||
|
|
if (ci->platdata->flags & CI_HDRC_IMX_IS_HSIC) {
|
||
|
|
tmp = ehci_readl(ehci, reg);
|
||
|
|
tmp &= ~(PORT_WKDISC_E | PORT_WKCONN_E);
|
||
|
|
ehci_writel(ehci, tmp, reg);
|
||
|
|
}
|
||
|
|
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void ci_hdrc_free_dma_aligned_buffer(struct urb *urb)
|
||
|
|
{
|
||
|
|
struct ci_hdrc_dma_aligned_buffer *temp;
|
||
|
|
size_t length;
|
||
|
|
|
||
|
|
if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER))
|
||
|
|
return;
|
||
|
|
|
||
|
|
temp = container_of(urb->transfer_buffer,
|
||
|
|
struct ci_hdrc_dma_aligned_buffer, data);
|
||
|
|
|
||
|
|
if (usb_urb_dir_in(urb)) {
|
||
|
|
if (usb_pipeisoc(urb->pipe))
|
||
|
|
length = urb->transfer_buffer_length;
|
||
|
|
else
|
||
|
|
length = urb->actual_length;
|
||
|
|
|
||
|
|
memcpy(temp->old_xfer_buffer, temp->data, length);
|
||
|
|
}
|
||
|
|
urb->transfer_buffer = temp->old_xfer_buffer;
|
||
|
|
kfree(temp->kmalloc_ptr);
|
||
|
|
|
||
|
|
urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ci_hdrc_alloc_dma_aligned_buffer(struct urb *urb, gfp_t mem_flags)
|
||
|
|
{
|
||
|
|
struct ci_hdrc_dma_aligned_buffer *temp, *kmalloc_ptr;
|
||
|
|
const unsigned int ci_hdrc_usb_dma_align = 32;
|
||
|
|
size_t kmalloc_size;
|
||
|
|
|
||
|
|
if (urb->num_sgs || urb->sg || urb->transfer_buffer_length == 0 ||
|
||
|
|
!((uintptr_t)urb->transfer_buffer & (ci_hdrc_usb_dma_align - 1)))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
/* Allocate a buffer with enough padding for alignment */
|
||
|
|
kmalloc_size = urb->transfer_buffer_length +
|
||
|
|
sizeof(struct ci_hdrc_dma_aligned_buffer) +
|
||
|
|
ci_hdrc_usb_dma_align - 1;
|
||
|
|
|
||
|
|
kmalloc_ptr = kmalloc(kmalloc_size, mem_flags);
|
||
|
|
if (!kmalloc_ptr)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
/* Position our struct dma_aligned_buffer such that data is aligned */
|
||
|
|
temp = PTR_ALIGN(kmalloc_ptr + 1, ci_hdrc_usb_dma_align) - 1;
|
||
|
|
temp->kmalloc_ptr = kmalloc_ptr;
|
||
|
|
temp->old_xfer_buffer = urb->transfer_buffer;
|
||
|
|
if (usb_urb_dir_out(urb))
|
||
|
|
memcpy(temp->data, urb->transfer_buffer,
|
||
|
|
urb->transfer_buffer_length);
|
||
|
|
urb->transfer_buffer = temp->data;
|
||
|
|
|
||
|
|
urb->transfer_flags |= URB_ALIGNED_TEMP_BUFFER;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ci_hdrc_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
|
||
|
|
gfp_t mem_flags)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = ci_hdrc_alloc_dma_aligned_buffer(urb, mem_flags);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
ret = usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
|
||
|
|
if (ret)
|
||
|
|
ci_hdrc_free_dma_aligned_buffer(urb);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void ci_hdrc_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
|
||
|
|
{
|
||
|
|
usb_hcd_unmap_urb_for_dma(hcd, urb);
|
||
|
|
ci_hdrc_free_dma_aligned_buffer(urb);
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef CONFIG_PM_SLEEP
|
||
|
|
static void ci_hdrc_host_suspend(struct ci_hdrc *ci)
|
||
|
|
{
|
||
|
|
ehci_suspend(ci->hcd, device_may_wakeup(ci->dev));
|
||
|
|
}
|
||
|
|
|
||
|
|
static void ci_hdrc_host_resume(struct ci_hdrc *ci, bool power_lost)
|
||
|
|
{
|
||
|
|
ehci_resume(ci->hcd, power_lost);
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
int ci_hdrc_host_init(struct ci_hdrc *ci)
|
||
|
|
{
|
||
|
|
struct ci_role_driver *rdrv;
|
||
|
|
|
||
|
|
if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC))
|
||
|
|
return -ENXIO;
|
||
|
|
|
||
|
|
rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
|
||
|
|
if (!rdrv)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
rdrv->start = host_start;
|
||
|
|
rdrv->stop = host_stop;
|
||
|
|
#ifdef CONFIG_PM_SLEEP
|
||
|
|
rdrv->suspend = ci_hdrc_host_suspend;
|
||
|
|
rdrv->resume = ci_hdrc_host_resume;
|
||
|
|
#endif
|
||
|
|
rdrv->irq = host_irq;
|
||
|
|
rdrv->name = "host";
|
||
|
|
ci->roles[CI_ROLE_HOST] = rdrv;
|
||
|
|
|
||
|
|
if (ci->platdata->flags & CI_HDRC_REQUIRES_ALIGNED_DMA) {
|
||
|
|
ci_ehci_hc_driver.map_urb_for_dma = ci_hdrc_map_urb_for_dma;
|
||
|
|
ci_ehci_hc_driver.unmap_urb_for_dma = ci_hdrc_unmap_urb_for_dma;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
void ci_hdrc_host_driver_init(void)
|
||
|
|
{
|
||
|
|
ehci_init_driver(&ci_ehci_hc_driver, &ehci_ci_overrides);
|
||
|
|
orig_bus_suspend = ci_ehci_hc_driver.bus_suspend;
|
||
|
|
ci_ehci_hc_driver.bus_suspend = ci_ehci_bus_suspend;
|
||
|
|
ci_ehci_hc_driver.hub_control = ci_ehci_hub_control;
|
||
|
|
}
|