drivers/usb/chipidea/host.c

   1 /*
   2  * host.c - ChipIdea USB host controller driver
   3  *
   4  * Copyright (c) 2012 Intel Corporation
   5  *
   6  * Author: Alexander Shishkin
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include <linux/kernel.h>
  23 #include <linux/io.h>
  24 #include <linux/usb.h>
  25 #include <linux/usb/hcd.h>
  26 #include <linux/usb/chipidea.h>
  27 #include <linux/regulator/consumer.h>
  28
  29 #include "../host/ehci.h"
  30
  31 #include "ci.h"
  32 #include "bits.h"
  33 #include "host.h"
  34
  35 static struct hc_driver __read_mostly ci_ehci_hc_driver;
  36 static int (*orig_bus_suspend)(struct usb_hcd *hcd);
  37
  38 struct ehci_ci_priv {
  39         struct regulator *reg_vbus;
  40         bool enabled;
  41 };
  42
  43 static int ehci_ci_portpower(struct usb_hcd *hcd, int portnum, bool enable)
  44 {
  45         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  46         struct ehci_ci_priv *priv = (struct ehci_ci_priv *)ehci->priv;
  47         struct device *dev = hcd->self.controller;
  48         struct ci_hdrc *ci = dev_get_drvdata(dev);
  49         int ret = 0;
  50         int port = HCS_N_PORTS(ehci->hcs_params);
  51
  52         if (priv->reg_vbus && enable != priv->enabled) {
  53                 if (port > 1) {
  54                         dev_warn(dev,
  55                                 "Not support multi-port regulator control\n");
  56                         return 0;
  57                 }
  58                 if (enable)
  59                         ret = regulator_enable(priv->reg_vbus);
  60                 else
  61                         ret = regulator_disable(priv->reg_vbus);
  62                 if (ret) {
  63                         dev_err(dev,
  64                                 "Failed to %s vbus regulator, ret=%d\n",
  65                                 enable ? "enable" : "disable", ret);
  66                         return ret;
  67                 }
  68                 priv->enabled = enable;
  69         }
  70
  71         if (enable && (ci->platdata->phy_mode == USBPHY_INTERFACE_MODE_HSIC)) {
  72                 /*
  73                  * Marvell 28nm HSIC PHY requires forcing the port to HS mode.
  74                  * As HSIC is always HS, this should be safe for others.
  75                  */
  76                 hw_port_test_set(ci, 5);
  77                 hw_port_test_set(ci, 0);
  78         }
  79         return 0;
  80 };
  81
  82 static int ehci_ci_reset(struct usb_hcd *hcd)
  83 {
  84         struct device *dev = hcd->self.controller;
  85         struct ci_hdrc *ci = dev_get_drvdata(dev);
  86         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  87         int ret;
  88
  89         ret = ehci_setup(hcd);
  90         if (ret)
  91                 return ret;
  92
  93         ehci->need_io_watchdog = 0;
  94
  95         if (ci->platdata->notify_event) {
  96                 ret = ci->platdata->notify_event(ci,
  97                                 CI_HDRC_CONTROLLER_RESET_EVENT);
  98                 if (ret)
  99                         return ret;
 100         }
 101
 102         ci_platform_configure(ci);
 103
 104         return ret;
 105 }
 106
 107 static const struct ehci_driver_overrides ehci_ci_overrides = {
 108         .extra_priv_size = sizeof(struct ehci_ci_priv),
 109         .port_power      = ehci_ci_portpower,
 110         .reset           = ehci_ci_reset,
 111 };
 112
 113 static irqreturn_t host_irq(struct ci_hdrc *ci)
 114 {
 115         return usb_hcd_irq(ci->irq, ci->hcd);
 116 }
 117
 118 static int host_start(struct ci_hdrc *ci)
 119 {
 120         struct usb_hcd *hcd;
 121         struct ehci_hcd *ehci;
 122         struct ehci_ci_priv *priv;
 123         int ret;
 124
 125         if (usb_disabled())
 126                 return -ENODEV;
 127
 128         hcd = __usb_create_hcd(&ci_ehci_hc_driver, ci->dev->parent,
 129                                ci->dev, dev_name(ci->dev), NULL);
 130         if (!hcd)
 131                 return -ENOMEM;
 132
 133         dev_set_drvdata(ci->dev, ci);
 134         hcd->rsrc_start = ci->hw_bank.phys;
 135         hcd->rsrc_len = ci->hw_bank.size;
 136         hcd->regs = ci->hw_bank.abs;
 137         hcd->has_tt = 1;
 138
 139         hcd->power_budget = ci->platdata->power_budget;
 140         hcd->tpl_support = ci->platdata->tpl_support;
 141         if (ci->phy)
 142                 hcd->phy = ci->phy;
 143         else
 144                 hcd->usb_phy = ci->usb_phy;
 145
 146         ehci = hcd_to_ehci(hcd);
 147         ehci->caps = ci->hw_bank.cap;
 148         ehci->has_hostpc = ci->hw_bank.lpm;
 149         ehci->has_tdi_phy_lpm = ci->hw_bank.lpm;
 150         ehci->imx28_write_fix = ci->imx28_write_fix;
 151
 152         priv = (struct ehci_ci_priv *)ehci->priv;
 153         priv->reg_vbus = NULL;
 154
 155         if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci)) {
 156                 if (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON) {
 157                         ret = regulator_enable(ci->platdata->reg_vbus);
 158                         if (ret) {
 159                                 dev_err(ci->dev,
 160                                 "Failed to enable vbus regulator, ret=%d\n",
 161                                                                         ret);
 162                                 goto put_hcd;
 163                         }
 164                 } else {
 165                         priv->reg_vbus = ci->platdata->reg_vbus;
 166                 }
 167         }
 168
 169         ret = usb_add_hcd(hcd, 0, 0);
 170         if (ret) {
 171                 goto disable_reg;
 172         } else {
 173                 struct usb_otg *otg = &ci->otg;
 174
 175                 ci->hcd = hcd;
 176
 177                 if (ci_otg_is_fsm_mode(ci)) {
 178                         otg->host = &hcd->self;
 179                         hcd->self.otg_port = 1;
 180                 }
 181         }
 182
 183         return ret;
 184
 185 disable_reg:
 186         if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
 187                         (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
 188                 regulator_disable(ci->platdata->reg_vbus);
 189 put_hcd:
 190         usb_put_hcd(hcd);
 191
 192         return ret;
 193 }
 194
 195 static void host_stop(struct ci_hdrc *ci)
 196 {
 197         struct usb_hcd *hcd = ci->hcd;
 198
 199         if (hcd) {
 200                 if (ci->platdata->notify_event)
 201                         ci->platdata->notify_event(ci,
 202                                 CI_HDRC_CONTROLLER_STOPPED_EVENT);
 203                 usb_remove_hcd(hcd);
 204                 ci->role = CI_ROLE_END;
 205                 synchronize_irq(ci->irq);
 206                 usb_put_hcd(hcd);
 207                 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
 208                         (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
 209                                 regulator_disable(ci->platdata->reg_vbus);
 210         }
 211         ci->hcd = NULL;
 212         ci->otg.host = NULL;
 213 }
 214
 215
 216 void ci_hdrc_host_destroy(struct ci_hdrc *ci)
 217 {
 218         if (ci->role == CI_ROLE_HOST && ci->hcd)
 219                 host_stop(ci);
 220 }
 221
 222 static int ci_ehci_bus_suspend(struct usb_hcd *hcd)
 223 {
 224         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 225         int port;
 226         u32 tmp;
 227
 228         int ret = orig_bus_suspend(hcd);
 229
 230         if (ret)
 231                 return ret;
 232
 233         port = HCS_N_PORTS(ehci->hcs_params);
 234         while (port--) {
 235                 u32 __iomem *reg = &ehci->regs->port_status[port];
 236                 u32 portsc = ehci_readl(ehci, reg);
 237
 238                 if (portsc & PORT_CONNECT) {
 239                         /*
 240                          * For chipidea, the resume signal will be ended
 241                          * automatically, so for remote wakeup case, the
 242                          * usbcmd.rs may not be set before the resume has
 243                          * ended if other resume paths consumes too much
 244                          * time (~24ms), in that case, the SOF will not
 245                          * send out within 3ms after resume ends, then the
 246                          * high speed device will enter full speed mode.
 247                          */
 248
 249                         tmp = ehci_readl(ehci, &ehci->regs->command);
 250                         tmp |= CMD_RUN;
 251                         ehci_writel(ehci, tmp, &ehci->regs->command);
 252                         /*
 253                          * It needs a short delay between set RS bit and PHCD.
 254                          */
 255                         usleep_range(150, 200);
 256                         break;
 257                 }
 258         }
 259
 260         return 0;
 261 }
 262
 263 int ci_hdrc_host_init(struct ci_hdrc *ci)
 264 {
 265         struct ci_role_driver *rdrv;
 266
 267         if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC))
 268                 return -ENXIO;
 269
 270         rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
 271         if (!rdrv)
 272                 return -ENOMEM;
 273
 274         rdrv->start     = host_start;
 275         rdrv->stop      = host_stop;
 276         rdrv->irq       = host_irq;
 277         rdrv->name      = "host";
 278         ci->roles[CI_ROLE_HOST] = rdrv;
 279
 280         return 0;
 281 }
 282
 283 void ci_hdrc_host_driver_init(void)
 284 {
 285         ehci_init_driver(&ci_ehci_hc_driver, &ehci_ci_overrides);
 286         orig_bus_suspend = ci_ehci_hc_driver.bus_suspend;
 287         ci_ehci_hc_driver.bus_suspend = ci_ehci_bus_suspend;
 288 }