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486 lines
12 KiB
486 lines
12 KiB
// 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 (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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* otherwise, there will be wakeup event. |
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*/ |
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if (ci->platdata->flags & CI_HDRC_IMX_IS_HSIC) { |
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tmp = ehci_readl(ehci, reg); |
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tmp &= ~(PORT_WKDISC_E | PORT_WKCONN_E); |
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ehci_writel(ehci, tmp, reg); |
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} |
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break; |
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} |
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} |
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return 0; |
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} |
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static void ci_hdrc_free_dma_aligned_buffer(struct urb *urb) |
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{ |
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struct ci_hdrc_dma_aligned_buffer *temp; |
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size_t length; |
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if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER)) |
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return; |
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temp = container_of(urb->transfer_buffer, |
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struct ci_hdrc_dma_aligned_buffer, data); |
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if (usb_urb_dir_in(urb)) { |
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if (usb_pipeisoc(urb->pipe)) |
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length = urb->transfer_buffer_length; |
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else |
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length = urb->actual_length; |
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memcpy(temp->old_xfer_buffer, temp->data, length); |
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} |
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urb->transfer_buffer = temp->old_xfer_buffer; |
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kfree(temp->kmalloc_ptr); |
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urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER; |
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} |
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static int ci_hdrc_alloc_dma_aligned_buffer(struct urb *urb, gfp_t mem_flags) |
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{ |
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struct ci_hdrc_dma_aligned_buffer *temp, *kmalloc_ptr; |
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const unsigned int ci_hdrc_usb_dma_align = 32; |
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size_t kmalloc_size; |
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if (urb->num_sgs || urb->sg || urb->transfer_buffer_length == 0 || |
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!((uintptr_t)urb->transfer_buffer & (ci_hdrc_usb_dma_align - 1))) |
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return 0; |
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/* Allocate a buffer with enough padding for alignment */ |
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kmalloc_size = urb->transfer_buffer_length + |
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sizeof(struct ci_hdrc_dma_aligned_buffer) + |
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ci_hdrc_usb_dma_align - 1; |
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kmalloc_ptr = kmalloc(kmalloc_size, mem_flags); |
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if (!kmalloc_ptr) |
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return -ENOMEM; |
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/* Position our struct dma_aligned_buffer such that data is aligned */ |
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temp = PTR_ALIGN(kmalloc_ptr + 1, ci_hdrc_usb_dma_align) - 1; |
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temp->kmalloc_ptr = kmalloc_ptr; |
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temp->old_xfer_buffer = urb->transfer_buffer; |
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if (usb_urb_dir_out(urb)) |
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memcpy(temp->data, urb->transfer_buffer, |
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urb->transfer_buffer_length); |
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urb->transfer_buffer = temp->data; |
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urb->transfer_flags |= URB_ALIGNED_TEMP_BUFFER; |
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return 0; |
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} |
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static int ci_hdrc_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb, |
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gfp_t mem_flags) |
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{ |
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int ret; |
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ret = ci_hdrc_alloc_dma_aligned_buffer(urb, mem_flags); |
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if (ret) |
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return ret; |
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ret = usb_hcd_map_urb_for_dma(hcd, urb, mem_flags); |
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if (ret) |
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ci_hdrc_free_dma_aligned_buffer(urb); |
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return ret; |
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} |
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static void ci_hdrc_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb) |
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{ |
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usb_hcd_unmap_urb_for_dma(hcd, urb); |
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ci_hdrc_free_dma_aligned_buffer(urb); |
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} |
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int ci_hdrc_host_init(struct ci_hdrc *ci) |
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{ |
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struct ci_role_driver *rdrv; |
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if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC)) |
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return -ENXIO; |
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rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL); |
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if (!rdrv) |
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return -ENOMEM; |
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rdrv->start = host_start; |
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rdrv->stop = host_stop; |
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rdrv->irq = host_irq; |
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rdrv->name = "host"; |
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ci->roles[CI_ROLE_HOST] = rdrv; |
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if (ci->platdata->flags & CI_HDRC_REQUIRES_ALIGNED_DMA) { |
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ci_ehci_hc_driver.map_urb_for_dma = ci_hdrc_map_urb_for_dma; |
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ci_ehci_hc_driver.unmap_urb_for_dma = ci_hdrc_unmap_urb_for_dma; |
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} |
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return 0; |
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} |
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void ci_hdrc_host_driver_init(void) |
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{ |
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ehci_init_driver(&ci_ehci_hc_driver, &ehci_ci_overrides); |
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orig_bus_suspend = ci_ehci_hc_driver.bus_suspend; |
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ci_ehci_hc_driver.bus_suspend = ci_ehci_bus_suspend; |
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ci_ehci_hc_driver.hub_control = ci_ehci_hub_control; |
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}
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