drivers/usb/chipidea/host.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * host.c - ChipIdea USB host controller driver
   4  *
   5  * Copyright (c) 2012 Intel Corporation
   6  *
   7  * Author: Alexander Shishkin
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/io.h>
  12 #include <linux/usb.h>
  13 #include <linux/usb/hcd.h>
  14 #include <linux/usb/chipidea.h>
  15 #include <linux/regulator/consumer.h>
  16
  17 #include "../host/ehci.h"
  18
  19 #include "ci.h"
  20 #include "bits.h"
  21 #include "host.h"
  22
  23 static struct hc_driver __read_mostly ci_ehci_hc_driver;
  24 static int (*orig_bus_suspend)(struct usb_hcd *hcd);
  25
  26 struct ehci_ci_priv {
  27         struct regulator *reg_vbus;
  28         bool enabled;
  29 };
  30
  31 static int ehci_ci_portpower(struct usb_hcd *hcd, int portnum, bool enable)
  32 {
  33         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  34         struct ehci_ci_priv *priv = (struct ehci_ci_priv *)ehci->priv;
  35         struct device *dev = hcd->self.controller;
  36         struct ci_hdrc *ci = dev_get_drvdata(dev);
  37         int ret = 0;
  38         int port = HCS_N_PORTS(ehci->hcs_params);
  39
  40         if (priv->reg_vbus && enable != priv->enabled) {
  41                 if (port > 1) {
  42                         dev_warn(dev,
  43                                 "Not support multi-port regulator control\n");
  44                         return 0;
  45                 }
  46                 if (enable)
  47                         ret = regulator_enable(priv->reg_vbus);
  48                 else
  49                         ret = regulator_disable(priv->reg_vbus);
  50                 if (ret) {
  51                         dev_err(dev,
  52                                 "Failed to %s vbus regulator, ret=%d\n",
  53                                 enable ? "enable" : "disable", ret);
  54                         return ret;
  55                 }
  56                 priv->enabled = enable;
  57         }
  58
  59         if (enable && (ci->platdata->phy_mode == USBPHY_INTERFACE_MODE_HSIC)) {
  60                 /*
  61                  * Marvell 28nm HSIC PHY requires forcing the port to HS mode.
  62                  * As HSIC is always HS, this should be safe for others.
  63                  */
  64                 hw_port_test_set(ci, 5);
  65                 hw_port_test_set(ci, 0);
  66         }
  67         return 0;
  68 };
  69
  70 static int ehci_ci_reset(struct usb_hcd *hcd)
  71 {
  72         struct device *dev = hcd->self.controller;
  73         struct ci_hdrc *ci = dev_get_drvdata(dev);
  74         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  75         int ret;
  76
  77         ret = ehci_setup(hcd);
  78         if (ret)
  79                 return ret;
  80
  81         ehci->need_io_watchdog = 0;
  82
  83         if (ci->platdata->notify_event) {
  84                 ret = ci->platdata->notify_event(ci,
  85                                 CI_HDRC_CONTROLLER_RESET_EVENT);
  86                 if (ret)
  87                         return ret;
  88         }
  89
  90         ci_platform_configure(ci);
  91
  92         return ret;
  93 }
  94
  95 static const struct ehci_driver_overrides ehci_ci_overrides = {
  96         .extra_priv_size = sizeof(struct ehci_ci_priv),
  97         .port_power      = ehci_ci_portpower,
  98         .reset           = ehci_ci_reset,
  99 };
 100
 101 static irqreturn_t host_irq(struct ci_hdrc *ci)
 102 {
 103         return usb_hcd_irq(ci->irq, ci->hcd);
 104 }
 105
 106 static int host_start(struct ci_hdrc *ci)
 107 {
 108         struct usb_hcd *hcd;
 109         struct ehci_hcd *ehci;
 110         struct ehci_ci_priv *priv;
 111         int ret;
 112
 113         if (usb_disabled())
 114                 return -ENODEV;
 115
 116         hcd = __usb_create_hcd(&ci_ehci_hc_driver, ci->dev->parent,
 117                                ci->dev, dev_name(ci->dev), NULL);
 118         if (!hcd)
 119                 return -ENOMEM;
 120
 121         dev_set_drvdata(ci->dev, ci);
 122         hcd->rsrc_start = ci->hw_bank.phys;
 123         hcd->rsrc_len = ci->hw_bank.size;
 124         hcd->regs = ci->hw_bank.abs;
 125         hcd->has_tt = 1;
 126
 127         hcd->power_budget = ci->platdata->power_budget;
 128         hcd->tpl_support = ci->platdata->tpl_support;
 129         if (ci->phy || ci->usb_phy) {
 130                 hcd->skip_phy_initialization = 1;
 131                 if (ci->usb_phy)
 132                         hcd->usb_phy = ci->usb_phy;
 133         }
 134
 135         ehci = hcd_to_ehci(hcd);
 136         ehci->caps = ci->hw_bank.cap;
 137         ehci->has_hostpc = ci->hw_bank.lpm;
 138         ehci->has_tdi_phy_lpm = ci->hw_bank.lpm;
 139         ehci->imx28_write_fix = ci->imx28_write_fix;
 140
 141         priv = (struct ehci_ci_priv *)ehci->priv;
 142         priv->reg_vbus = NULL;
 143
 144         if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci)) {
 145                 if (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON) {
 146                         ret = regulator_enable(ci->platdata->reg_vbus);
 147                         if (ret) {
 148                                 dev_err(ci->dev,
 149                                 "Failed to enable vbus regulator, ret=%d\n",
 150                                                                         ret);
 151                                 goto put_hcd;
 152                         }
 153                 } else {
 154                         priv->reg_vbus = ci->platdata->reg_vbus;
 155                 }
 156         }
 157
 158         ret = usb_add_hcd(hcd, 0, 0);
 159         if (ret) {
 160                 goto disable_reg;
 161         } else {
 162                 struct usb_otg *otg = &ci->otg;
 163
 164                 ci->hcd = hcd;
 165
 166                 if (ci_otg_is_fsm_mode(ci)) {
 167                         otg->host = &hcd->self;
 168                         hcd->self.otg_port = 1;
 169                 }
 170         }
 171
 172         return ret;
 173
 174 disable_reg:
 175         if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
 176                         (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
 177                 regulator_disable(ci->platdata->reg_vbus);
 178 put_hcd:
 179         usb_put_hcd(hcd);
 180
 181         return ret;
 182 }
 183
 184 static void host_stop(struct ci_hdrc *ci)
 185 {
 186         struct usb_hcd *hcd = ci->hcd;
 187
 188         if (hcd) {
 189                 if (ci->platdata->notify_event)
 190                         ci->platdata->notify_event(ci,
 191                                 CI_HDRC_CONTROLLER_STOPPED_EVENT);
 192                 usb_remove_hcd(hcd);
 193                 ci->role = CI_ROLE_END;
 194                 synchronize_irq(ci->irq);
 195                 usb_put_hcd(hcd);
 196                 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
 197                         (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
 198                                 regulator_disable(ci->platdata->reg_vbus);
 199         }
 200         ci->hcd = NULL;
 201         ci->otg.host = NULL;
 202 }
 203
 204
 205 void ci_hdrc_host_destroy(struct ci_hdrc *ci)
 206 {
 207         if (ci->role == CI_ROLE_HOST && ci->hcd)
 208                 host_stop(ci);
 209 }
 210
 211 static int ci_ehci_bus_suspend(struct usb_hcd *hcd)
 212 {
 213         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 214         int port;
 215         u32 tmp;
 216
 217         int ret = orig_bus_suspend(hcd);
 218
 219         if (ret)
 220                 return ret;
 221
 222         port = HCS_N_PORTS(ehci->hcs_params);
 223         while (port--) {
 224                 u32 __iomem *reg = &ehci->regs->port_status[port];
 225                 u32 portsc = ehci_readl(ehci, reg);
 226
 227                 if (portsc & PORT_CONNECT) {
 228                         /*
 229                          * For chipidea, the resume signal will be ended
 230                          * automatically, so for remote wakeup case, the
 231                          * usbcmd.rs may not be set before the resume has
 232                          * ended if other resume paths consumes too much
 233                          * time (~24ms), in that case, the SOF will not
 234                          * send out within 3ms after resume ends, then the
 235                          * high speed device will enter full speed mode.
 236                          */
 237
 238                         tmp = ehci_readl(ehci, &ehci->regs->command);
 239                         tmp |= CMD_RUN;
 240                         ehci_writel(ehci, tmp, &ehci->regs->command);
 241                         /*
 242                          * It needs a short delay between set RS bit and PHCD.
 243                          */
 244                         usleep_range(150, 200);
 245                         break;
 246                 }
 247         }
 248
 249         return 0;
 250 }
 251
 252 int ci_hdrc_host_init(struct ci_hdrc *ci)
 253 {
 254         struct ci_role_driver *rdrv;
 255
 256         if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC))
 257                 return -ENXIO;
 258
 259         rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
 260         if (!rdrv)
 261                 return -ENOMEM;
 262
 263         rdrv->start     = host_start;
 264         rdrv->stop      = host_stop;
 265         rdrv->irq       = host_irq;
 266         rdrv->name      = "host";
 267         ci->roles[CI_ROLE_HOST] = rdrv;
 268
 269         return 0;
 270 }
 271
 272 void ci_hdrc_host_driver_init(void)
 273 {
 274         ehci_init_driver(&ci_ehci_hc_driver, &ehci_ci_overrides);
 275         orig_bus_suspend = ci_ehci_hc_driver.bus_suspend;
 276         ci_ehci_hc_driver.bus_suspend = ci_ehci_bus_suspend;
 277 }