592 lines
14 KiB
C
592 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* OHCI HCD (Host Controller Driver) for USB.
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*
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* TI DA8xx (OMAP-L1x) Bus Glue
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*
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* Derived from: ohci-omap.c and ohci-s3c2410.c
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* Copyright (C) 2008-2009 MontaVista Software, Inc. <source@mvista.com>
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*/
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <linux/interrupt.h>
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#include <linux/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/phy/phy.h>
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#include <linux/platform_data/usb-davinci.h>
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#include <linux/regulator/consumer.h>
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#include <linux/usb.h>
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#include <linux/usb/hcd.h>
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#include <asm/unaligned.h>
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#include "ohci.h"
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#define DRIVER_DESC "DA8XX"
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#define DRV_NAME "ohci-da8xx"
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static struct hc_driver __read_mostly ohci_da8xx_hc_driver;
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static int (*orig_ohci_hub_control)(struct usb_hcd *hcd, u16 typeReq,
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u16 wValue, u16 wIndex, char *buf, u16 wLength);
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static int (*orig_ohci_hub_status_data)(struct usb_hcd *hcd, char *buf);
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struct da8xx_ohci_hcd {
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struct usb_hcd *hcd;
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struct clk *usb11_clk;
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struct phy *usb11_phy;
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struct regulator *vbus_reg;
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struct notifier_block nb;
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unsigned int reg_enabled;
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};
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#define to_da8xx_ohci(hcd) (struct da8xx_ohci_hcd *)(hcd_to_ohci(hcd)->priv)
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/* Over-current indicator change bitmask */
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static volatile u16 ocic_mask;
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static int ohci_da8xx_enable(struct usb_hcd *hcd)
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{
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struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
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int ret;
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ret = clk_prepare_enable(da8xx_ohci->usb11_clk);
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if (ret)
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return ret;
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ret = phy_init(da8xx_ohci->usb11_phy);
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if (ret)
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goto err_phy_init;
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ret = phy_power_on(da8xx_ohci->usb11_phy);
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if (ret)
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goto err_phy_power_on;
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return 0;
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err_phy_power_on:
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phy_exit(da8xx_ohci->usb11_phy);
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err_phy_init:
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clk_disable_unprepare(da8xx_ohci->usb11_clk);
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return ret;
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}
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static void ohci_da8xx_disable(struct usb_hcd *hcd)
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{
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struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
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phy_power_off(da8xx_ohci->usb11_phy);
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phy_exit(da8xx_ohci->usb11_phy);
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clk_disable_unprepare(da8xx_ohci->usb11_clk);
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}
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static int ohci_da8xx_set_power(struct usb_hcd *hcd, int on)
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{
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struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
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struct device *dev = hcd->self.controller;
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struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);
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int ret;
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if (hub && hub->set_power)
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return hub->set_power(1, on);
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if (!da8xx_ohci->vbus_reg)
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return 0;
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if (on && !da8xx_ohci->reg_enabled) {
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ret = regulator_enable(da8xx_ohci->vbus_reg);
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if (ret) {
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dev_err(dev, "Failed to enable regulator: %d\n", ret);
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return ret;
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}
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da8xx_ohci->reg_enabled = 1;
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} else if (!on && da8xx_ohci->reg_enabled) {
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ret = regulator_disable(da8xx_ohci->vbus_reg);
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if (ret) {
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dev_err(dev, "Failed to disable regulator: %d\n", ret);
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return ret;
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}
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da8xx_ohci->reg_enabled = 0;
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}
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return 0;
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}
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static int ohci_da8xx_get_power(struct usb_hcd *hcd)
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{
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struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
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struct device *dev = hcd->self.controller;
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struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);
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if (hub && hub->get_power)
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return hub->get_power(1);
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if (da8xx_ohci->vbus_reg)
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return regulator_is_enabled(da8xx_ohci->vbus_reg);
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return 1;
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}
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static int ohci_da8xx_get_oci(struct usb_hcd *hcd)
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{
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struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
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struct device *dev = hcd->self.controller;
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struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);
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unsigned int flags;
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int ret;
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if (hub && hub->get_oci)
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return hub->get_oci(1);
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if (!da8xx_ohci->vbus_reg)
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return 0;
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ret = regulator_get_error_flags(da8xx_ohci->vbus_reg, &flags);
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if (ret)
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return ret;
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if (flags & REGULATOR_ERROR_OVER_CURRENT)
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return 1;
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return 0;
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}
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static int ohci_da8xx_has_set_power(struct usb_hcd *hcd)
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{
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struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
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struct device *dev = hcd->self.controller;
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struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);
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if (hub && hub->set_power)
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return 1;
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if (da8xx_ohci->vbus_reg)
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return 1;
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return 0;
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}
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static int ohci_da8xx_has_oci(struct usb_hcd *hcd)
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{
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struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
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struct device *dev = hcd->self.controller;
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struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);
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if (hub && hub->get_oci)
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return 1;
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if (da8xx_ohci->vbus_reg)
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return 1;
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return 0;
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}
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static int ohci_da8xx_has_potpgt(struct usb_hcd *hcd)
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{
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struct device *dev = hcd->self.controller;
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struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);
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if (hub && hub->potpgt)
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return 1;
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return 0;
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}
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/*
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* Handle the port over-current indicator change.
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*/
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static void ohci_da8xx_ocic_handler(struct da8xx_ohci_root_hub *hub,
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unsigned port)
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{
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ocic_mask |= 1 << port;
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/* Once over-current is detected, the port needs to be powered down */
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if (hub->get_oci(port) > 0)
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hub->set_power(port, 0);
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}
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static int ohci_da8xx_regulator_event(struct notifier_block *nb,
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unsigned long event, void *data)
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{
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struct da8xx_ohci_hcd *da8xx_ohci =
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container_of(nb, struct da8xx_ohci_hcd, nb);
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if (event & REGULATOR_EVENT_OVER_CURRENT) {
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ocic_mask |= 1 << 1;
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ohci_da8xx_set_power(da8xx_ohci->hcd, 0);
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}
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return 0;
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}
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static int ohci_da8xx_register_notify(struct usb_hcd *hcd)
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{
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struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
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struct device *dev = hcd->self.controller;
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struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);
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int ret = 0;
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if (hub && hub->ocic_notify) {
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ret = hub->ocic_notify(ohci_da8xx_ocic_handler);
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} else if (da8xx_ohci->vbus_reg) {
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da8xx_ohci->nb.notifier_call = ohci_da8xx_regulator_event;
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ret = devm_regulator_register_notifier(da8xx_ohci->vbus_reg,
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&da8xx_ohci->nb);
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}
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if (ret)
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dev_err(dev, "Failed to register notifier: %d\n", ret);
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return ret;
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}
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static void ohci_da8xx_unregister_notify(struct usb_hcd *hcd)
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{
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struct device *dev = hcd->self.controller;
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struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);
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if (hub && hub->ocic_notify)
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hub->ocic_notify(NULL);
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}
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static int ohci_da8xx_reset(struct usb_hcd *hcd)
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{
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struct device *dev = hcd->self.controller;
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struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);
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struct ohci_hcd *ohci = hcd_to_ohci(hcd);
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int result;
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u32 rh_a;
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dev_dbg(dev, "starting USB controller\n");
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result = ohci_da8xx_enable(hcd);
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if (result < 0)
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return result;
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/*
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* DA8xx only have 1 port connected to the pins but the HC root hub
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* register A reports 2 ports, thus we'll have to override it...
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*/
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ohci->num_ports = 1;
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result = ohci_setup(hcd);
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if (result < 0) {
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ohci_da8xx_disable(hcd);
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return result;
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}
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/*
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* Since we're providing a board-specific root hub port power control
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* and over-current reporting, we have to override the HC root hub A
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* register's default value, so that ohci_hub_control() could return
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* the correct hub descriptor...
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*/
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rh_a = ohci_readl(ohci, &ohci->regs->roothub.a);
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if (ohci_da8xx_has_set_power(hcd)) {
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rh_a &= ~RH_A_NPS;
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rh_a |= RH_A_PSM;
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}
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if (ohci_da8xx_has_oci(hcd)) {
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rh_a &= ~RH_A_NOCP;
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rh_a |= RH_A_OCPM;
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}
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if (ohci_da8xx_has_potpgt(hcd)) {
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rh_a &= ~RH_A_POTPGT;
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rh_a |= hub->potpgt << 24;
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}
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ohci_writel(ohci, rh_a, &ohci->regs->roothub.a);
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return result;
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}
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/*
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* Update the status data from the hub with the over-current indicator change.
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*/
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static int ohci_da8xx_hub_status_data(struct usb_hcd *hcd, char *buf)
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{
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int length = orig_ohci_hub_status_data(hcd, buf);
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/* See if we have OCIC bit set on port 1 */
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if (ocic_mask & (1 << 1)) {
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dev_dbg(hcd->self.controller, "over-current indicator change "
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"on port 1\n");
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if (!length)
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length = 1;
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buf[0] |= 1 << 1;
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}
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return length;
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}
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/*
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* Look at the control requests to the root hub and see if we need to override.
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*/
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static int ohci_da8xx_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
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u16 wIndex, char *buf, u16 wLength)
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{
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struct device *dev = hcd->self.controller;
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int temp;
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switch (typeReq) {
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case GetPortStatus:
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/* Check the port number */
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if (wIndex != 1)
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break;
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dev_dbg(dev, "GetPortStatus(%u)\n", wIndex);
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temp = roothub_portstatus(hcd_to_ohci(hcd), wIndex - 1);
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/* The port power status (PPS) bit defaults to 1 */
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if (!ohci_da8xx_get_power(hcd))
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temp &= ~RH_PS_PPS;
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/* The port over-current indicator (POCI) bit is always 0 */
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if (ohci_da8xx_get_oci(hcd) > 0)
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temp |= RH_PS_POCI;
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/* The over-current indicator change (OCIC) bit is 0 too */
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if (ocic_mask & (1 << wIndex))
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temp |= RH_PS_OCIC;
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put_unaligned(cpu_to_le32(temp), (__le32 *)buf);
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return 0;
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case SetPortFeature:
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temp = 1;
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goto check_port;
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case ClearPortFeature:
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temp = 0;
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check_port:
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/* Check the port number */
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if (wIndex != 1)
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break;
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switch (wValue) {
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case USB_PORT_FEAT_POWER:
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dev_dbg(dev, "%sPortFeature(%u): %s\n",
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temp ? "Set" : "Clear", wIndex, "POWER");
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return ohci_da8xx_set_power(hcd, temp) ? -EPIPE : 0;
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case USB_PORT_FEAT_C_OVER_CURRENT:
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dev_dbg(dev, "%sPortFeature(%u): %s\n",
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temp ? "Set" : "Clear", wIndex,
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"C_OVER_CURRENT");
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if (temp)
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ocic_mask |= 1 << wIndex;
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else
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ocic_mask &= ~(1 << wIndex);
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return 0;
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}
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}
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return orig_ohci_hub_control(hcd, typeReq, wValue,
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wIndex, buf, wLength);
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}
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/*-------------------------------------------------------------------------*/
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#ifdef CONFIG_OF
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static const struct of_device_id da8xx_ohci_ids[] = {
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{ .compatible = "ti,da830-ohci" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, da8xx_ohci_ids);
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#endif
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static int ohci_da8xx_probe(struct platform_device *pdev)
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{
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struct da8xx_ohci_hcd *da8xx_ohci;
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struct usb_hcd *hcd;
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struct resource *mem;
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int error, irq;
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hcd = usb_create_hcd(&ohci_da8xx_hc_driver, &pdev->dev,
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dev_name(&pdev->dev));
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if (!hcd)
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return -ENOMEM;
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da8xx_ohci = to_da8xx_ohci(hcd);
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da8xx_ohci->hcd = hcd;
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da8xx_ohci->usb11_clk = devm_clk_get(&pdev->dev, "usb11");
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if (IS_ERR(da8xx_ohci->usb11_clk)) {
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error = PTR_ERR(da8xx_ohci->usb11_clk);
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if (error != -EPROBE_DEFER)
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dev_err(&pdev->dev, "Failed to get clock.\n");
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goto err;
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}
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da8xx_ohci->usb11_phy = devm_phy_get(&pdev->dev, "usb-phy");
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if (IS_ERR(da8xx_ohci->usb11_phy)) {
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error = PTR_ERR(da8xx_ohci->usb11_phy);
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if (error != -EPROBE_DEFER)
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dev_err(&pdev->dev, "Failed to get phy.\n");
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goto err;
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}
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da8xx_ohci->vbus_reg = devm_regulator_get_optional(&pdev->dev, "vbus");
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if (IS_ERR(da8xx_ohci->vbus_reg)) {
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error = PTR_ERR(da8xx_ohci->vbus_reg);
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if (error == -ENODEV) {
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da8xx_ohci->vbus_reg = NULL;
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} else if (error == -EPROBE_DEFER) {
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goto err;
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} else {
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dev_err(&pdev->dev, "Failed to get regulator\n");
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goto err;
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}
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}
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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hcd->regs = devm_ioremap_resource(&pdev->dev, mem);
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if (IS_ERR(hcd->regs)) {
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error = PTR_ERR(hcd->regs);
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goto err;
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}
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hcd->rsrc_start = mem->start;
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hcd->rsrc_len = resource_size(mem);
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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error = -ENODEV;
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goto err;
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}
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error = usb_add_hcd(hcd, irq, 0);
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if (error)
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goto err;
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device_wakeup_enable(hcd->self.controller);
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error = ohci_da8xx_register_notify(hcd);
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if (error)
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goto err_remove_hcd;
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return 0;
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err_remove_hcd:
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usb_remove_hcd(hcd);
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err:
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usb_put_hcd(hcd);
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return error;
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}
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static int ohci_da8xx_remove(struct platform_device *pdev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(pdev);
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ohci_da8xx_unregister_notify(hcd);
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usb_remove_hcd(hcd);
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usb_put_hcd(hcd);
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return 0;
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}
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#ifdef CONFIG_PM
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static int ohci_da8xx_suspend(struct platform_device *pdev,
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pm_message_t message)
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{
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struct usb_hcd *hcd = platform_get_drvdata(pdev);
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struct ohci_hcd *ohci = hcd_to_ohci(hcd);
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bool do_wakeup = device_may_wakeup(&pdev->dev);
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int ret;
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if (time_before(jiffies, ohci->next_statechange))
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msleep(5);
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ohci->next_statechange = jiffies;
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ret = ohci_suspend(hcd, do_wakeup);
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if (ret)
|
|
return ret;
|
|
|
|
ohci_da8xx_disable(hcd);
|
|
hcd->state = HC_STATE_SUSPENDED;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ohci_da8xx_resume(struct platform_device *dev)
|
|
{
|
|
struct usb_hcd *hcd = platform_get_drvdata(dev);
|
|
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
|
|
int ret;
|
|
|
|
if (time_before(jiffies, ohci->next_statechange))
|
|
msleep(5);
|
|
ohci->next_statechange = jiffies;
|
|
|
|
ret = ohci_da8xx_enable(hcd);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ohci_resume(hcd, false);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static const struct ohci_driver_overrides da8xx_overrides __initconst = {
|
|
.reset = ohci_da8xx_reset,
|
|
.extra_priv_size = sizeof(struct da8xx_ohci_hcd),
|
|
};
|
|
|
|
/*
|
|
* Driver definition to register with platform structure.
|
|
*/
|
|
static struct platform_driver ohci_hcd_da8xx_driver = {
|
|
.probe = ohci_da8xx_probe,
|
|
.remove = ohci_da8xx_remove,
|
|
.shutdown = usb_hcd_platform_shutdown,
|
|
#ifdef CONFIG_PM
|
|
.suspend = ohci_da8xx_suspend,
|
|
.resume = ohci_da8xx_resume,
|
|
#endif
|
|
.driver = {
|
|
.name = DRV_NAME,
|
|
.of_match_table = of_match_ptr(da8xx_ohci_ids),
|
|
},
|
|
};
|
|
|
|
static int __init ohci_da8xx_init(void)
|
|
{
|
|
|
|
if (usb_disabled())
|
|
return -ENODEV;
|
|
|
|
pr_info("%s: " DRIVER_DESC "\n", DRV_NAME);
|
|
ohci_init_driver(&ohci_da8xx_hc_driver, &da8xx_overrides);
|
|
|
|
/*
|
|
* The Davinci da8xx HW has some unusual quirks, which require
|
|
* da8xx-specific workarounds. We override certain hc_driver
|
|
* functions here to achieve that. We explicitly do not enhance
|
|
* ohci_driver_overrides to allow this more easily, since this
|
|
* is an unusual case, and we don't want to encourage others to
|
|
* override these functions by making it too easy.
|
|
*/
|
|
|
|
orig_ohci_hub_control = ohci_da8xx_hc_driver.hub_control;
|
|
orig_ohci_hub_status_data = ohci_da8xx_hc_driver.hub_status_data;
|
|
|
|
ohci_da8xx_hc_driver.hub_status_data = ohci_da8xx_hub_status_data;
|
|
ohci_da8xx_hc_driver.hub_control = ohci_da8xx_hub_control;
|
|
|
|
return platform_driver_register(&ohci_hcd_da8xx_driver);
|
|
}
|
|
module_init(ohci_da8xx_init);
|
|
|
|
static void __exit ohci_da8xx_exit(void)
|
|
{
|
|
platform_driver_unregister(&ohci_hcd_da8xx_driver);
|
|
}
|
|
module_exit(ohci_da8xx_exit);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:" DRV_NAME);
|