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 #include <linux/pinctrl/consumer.h>
  17
  18 #include "../host/ehci.h"
  19
  20 #include "ci.h"
  21 #include "bits.h"
  22 #include "host.h"
  23
  24 static struct hc_driver __read_mostly ci_ehci_hc_driver;
  25 static int (*orig_bus_suspend)(struct usb_hcd *hcd);
  26
  27 struct ehci_ci_priv {
  28         struct regulator *reg_vbus;
  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) {
  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         }
  57
  58         if (enable && (ci->platdata->phy_mode == USBPHY_INTERFACE_MODE_HSIC)) {
  59                 /*
  60                  * Marvell 28nm HSIC PHY requires forcing the port to HS mode.
  61                  * As HSIC is always HS, this should be safe for others.
  62                  */
  63                 hw_port_test_set(ci, 5);
  64                 hw_port_test_set(ci, 0);
  65         }
  66         return 0;
  67 };
  68
  69 static int ehci_ci_reset(struct usb_hcd *hcd)
  70 {
  71         struct device *dev = hcd->self.controller;
  72         struct ci_hdrc *ci = dev_get_drvdata(dev);
  73         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  74         int ret;
  75
  76         ret = ehci_setup(hcd);
  77         if (ret)
  78                 return ret;
  79
  80         ehci->need_io_watchdog = 0;
  81
  82         if (ci->platdata->notify_event) {
  83                 ret = ci->platdata->notify_event(ci,
  84                                 CI_HDRC_CONTROLLER_RESET_EVENT);
  85                 if (ret)
  86                         return ret;
  87         }
  88
  89         ci_platform_configure(ci);
  90
  91         return ret;
  92 }
  93
  94 static const struct ehci_driver_overrides ehci_ci_overrides = {
  95         .extra_priv_size = sizeof(struct ehci_ci_priv),
  96         .port_power      = ehci_ci_portpower,
  97         .reset           = ehci_ci_reset,
  98 };
  99
 100 static irqreturn_t host_irq(struct ci_hdrc *ci)
 101 {
 102         return usb_hcd_irq(ci->irq, ci->hcd);
 103 }
 104
 105 static int host_start(struct ci_hdrc *ci)
 106 {
 107         struct usb_hcd *hcd;
 108         struct ehci_hcd *ehci;
 109         struct ehci_ci_priv *priv;
 110         int ret;
 111
 112         if (usb_disabled())
 113                 return -ENODEV;
 114
 115         hcd = __usb_create_hcd(&ci_ehci_hc_driver, ci->dev->parent,
 116                                ci->dev, dev_name(ci->dev), NULL);
 117         if (!hcd)
 118                 return -ENOMEM;
 119
 120         dev_set_drvdata(ci->dev, ci);
 121         hcd->rsrc_start = ci->hw_bank.phys;
 122         hcd->rsrc_len = ci->hw_bank.size;
 123         hcd->regs = ci->hw_bank.abs;
 124         hcd->has_tt = 1;
 125
 126         hcd->power_budget = ci->platdata->power_budget;
 127         hcd->tpl_support = ci->platdata->tpl_support;
 128         if (ci->phy || ci->usb_phy) {
 129                 hcd->skip_phy_initialization = 1;
 130                 if (ci->usb_phy)
 131                         hcd->usb_phy = ci->usb_phy;
 132         }
 133
 134         ehci = hcd_to_ehci(hcd);
 135         ehci->caps = ci->hw_bank.cap;
 136         ehci->has_hostpc = ci->hw_bank.lpm;
 137         ehci->has_tdi_phy_lpm = ci->hw_bank.lpm;
 138         ehci->imx28_write_fix = ci->imx28_write_fix;
 139
 140         priv = (struct ehci_ci_priv *)ehci->priv;
 141         priv->reg_vbus = NULL;
 142
 143         if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci)) {
 144                 if (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON) {
 145                         ret = regulator_enable(ci->platdata->reg_vbus);
 146                         if (ret) {
 147                                 dev_err(ci->dev,
 148                                 "Failed to enable vbus regulator, ret=%d\n",
 149                                                                         ret);
 150                                 goto put_hcd;
 151                         }
 152                 } else {
 153                         priv->reg_vbus = ci->platdata->reg_vbus;
 154                 }
 155         }
 156
 157         if (ci->platdata->pins_host)
 158                 pinctrl_select_state(ci->platdata->pctl,
 159                                      ci->platdata->pins_host);
 160
 161         ret = usb_add_hcd(hcd, 0, 0);
 162         if (ret) {
 163                 goto disable_reg;
 164         } else {
 165                 struct usb_otg *otg = &ci->otg;
 166
 167                 ci->hcd = hcd;
 168
 169                 if (ci_otg_is_fsm_mode(ci)) {
 170                         otg->host = &hcd->self;
 171                         hcd->self.otg_port = 1;
 172                 }
 173         }
 174
 175         return ret;
 176
 177 disable_reg:
 178         if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
 179                         (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
 180                 regulator_disable(ci->platdata->reg_vbus);
 181 put_hcd:
 182         usb_put_hcd(hcd);
 183
 184         return ret;
 185 }
 186
 187 static void host_stop(struct ci_hdrc *ci)
 188 {
 189         struct usb_hcd *hcd = ci->hcd;
 190
 191         if (hcd) {
 192                 if (ci->platdata->notify_event)
 193                         ci->platdata->notify_event(ci,
 194                                 CI_HDRC_CONTROLLER_STOPPED_EVENT);
 195                 usb_remove_hcd(hcd);
 196                 ci->role = CI_ROLE_END;
 197                 synchronize_irq(ci->irq);
 198                 usb_put_hcd(hcd);
 199                 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
 200                         (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
 201                                 regulator_disable(ci->platdata->reg_vbus);
 202         }
 203         ci->hcd = NULL;
 204         ci->otg.host = NULL;
 205
 206         if (ci->platdata->pins_host && ci->platdata->pins_default)
 207                 pinctrl_select_state(ci->platdata->pctl,
 208                                      ci->platdata->pins_default);
 209 }
 210
 211
 212 void ci_hdrc_host_destroy(struct ci_hdrc *ci)
 213 {
 214         if (ci->role == CI_ROLE_HOST && ci->hcd)
 215                 host_stop(ci);
 216 }
 217
 218 static int ci_ehci_bus_suspend(struct usb_hcd *hcd)
 219 {
 220         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 221         int port;
 222         u32 tmp;
 223
 224         int ret = orig_bus_suspend(hcd);
 225
 226         if (ret)
 227                 return ret;
 228
 229         port = HCS_N_PORTS(ehci->hcs_params);
 230         while (port--) {
 231                 u32 __iomem *reg = &ehci->regs->port_status[port];
 232                 u32 portsc = ehci_readl(ehci, reg);
 233
 234                 if (portsc & PORT_CONNECT) {
 235                         /*
 236                          * For chipidea, the resume signal will be ended
 237                          * automatically, so for remote wakeup case, the
 238                          * usbcmd.rs may not be set before the resume has
 239                          * ended if other resume paths consumes too much
 240                          * time (~24ms), in that case, the SOF will not
 241                          * send out within 3ms after resume ends, then the
 242                          * high speed device will enter full speed mode.
 243                          */
 244
 245                         tmp = ehci_readl(ehci, &ehci->regs->command);
 246                         tmp |= CMD_RUN;
 247                         ehci_writel(ehci, tmp, &ehci->regs->command);
 248                         /*
 249                          * It needs a short delay between set RS bit and PHCD.
 250                          */
 251                         usleep_range(150, 200);
 252                         break;
 253                 }
 254         }
 255
 256         return 0;
 257 }
 258
 259 int ci_hdrc_host_init(struct ci_hdrc *ci)
 260 {
 261         struct ci_role_driver *rdrv;
 262
 263         if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC))
 264                 return -ENXIO;
 265
 266         rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
 267         if (!rdrv)
 268                 return -ENOMEM;
 269
 270         rdrv->start     = host_start;
 271         rdrv->stop      = host_stop;
 272         rdrv->irq       = host_irq;
 273         rdrv->name      = "host";
 274         ci->roles[CI_ROLE_HOST] = rdrv;
 275
 276         return 0;
 277 }
 278
 279 void ci_hdrc_host_driver_init(void)
 280 {
 281         ehci_init_driver(&ci_ehci_hc_driver, &ehci_ci_overrides);
 282         orig_bus_suspend = ci_ehci_hc_driver.bus_suspend;
 283         ci_ehci_hc_driver.bus_suspend = ci_ehci_bus_suspend;
 284 }