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