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 };
  41
  42 static int ehci_ci_portpower(struct usb_hcd *hcd, int portnum, bool enable)
  43 {
  44         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  45         struct ehci_ci_priv *priv = (struct ehci_ci_priv *)ehci->priv;
  46         struct device *dev = hcd->self.controller;
  47         struct ci_hdrc *ci = dev_get_drvdata(dev);
  48         int ret = 0;
  49         int port = HCS_N_PORTS(ehci->hcs_params);
  50
  51         if (priv->reg_vbus) {
  52                 if (port > 1) {
  53                         dev_warn(dev,
  54                                 "Not support multi-port regulator control\n");
  55                         return 0;
  56                 }
  57                 if (enable)
  58                         ret = regulator_enable(priv->reg_vbus);
  59                 else
  60                         ret = regulator_disable(priv->reg_vbus);
  61                 if (ret) {
  62                         dev_err(dev,
  63                                 "Failed to %s vbus regulator, ret=%d\n",
  64                                 enable ? "enable" : "disable", ret);
  65                         return ret;
  66                 }
  67         }
  68
  69         if (enable && (ci->platdata->phy_mode == USBPHY_INTERFACE_MODE_HSIC)) {
  70                 /*
  71                  * Marvell 28nm HSIC PHY requires forcing the port to HS mode.
  72                  * As HSIC is always HS, this should be safe for others.
  73                  */
  74                 hw_port_test_set(ci, 5);
  75                 hw_port_test_set(ci, 0);
  76         }
  77         return 0;
  78 };
  79
  80 static int ehci_ci_reset(struct usb_hcd *hcd)
  81 {
  82         struct device *dev = hcd->self.controller;
  83         struct ci_hdrc *ci = dev_get_drvdata(dev);
  84         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  85         int ret;
  86
  87         ret = ehci_setup(hcd);
  88         if (ret)
  89                 return ret;
  90
  91         ehci->need_io_watchdog = 0;
  92
  93         if (ci->platdata->notify_event) {
  94                 ret = ci->platdata->notify_event(ci,
  95                                 CI_HDRC_CONTROLLER_RESET_EVENT);
  96                 if (ret)
  97                         return ret;
  98         }
  99
 100         ci_platform_configure(ci);
 101
 102         return ret;
 103 }
 104
 105 static const struct ehci_driver_overrides ehci_ci_overrides = {
 106         .extra_priv_size = sizeof(struct ehci_ci_priv),
 107         .port_power      = ehci_ci_portpower,
 108         .reset           = ehci_ci_reset,
 109 };
 110
 111 static irqreturn_t host_irq(struct ci_hdrc *ci)
 112 {
 113         return usb_hcd_irq(ci->irq, ci->hcd);
 114 }
 115
 116 static int host_start(struct ci_hdrc *ci)
 117 {
 118         struct usb_hcd *hcd;
 119         struct ehci_hcd *ehci;
 120         struct ehci_ci_priv *priv;
 121         int ret;
 122
 123         if (usb_disabled())
 124                 return -ENODEV;
 125
 126         hcd = __usb_create_hcd(&ci_ehci_hc_driver, ci->dev->parent,
 127                                ci->dev, dev_name(ci->dev), NULL);
 128         if (!hcd)
 129                 return -ENOMEM;
 130
 131         dev_set_drvdata(ci->dev, ci);
 132         hcd->rsrc_start = ci->hw_bank.phys;
 133         hcd->rsrc_len = ci->hw_bank.size;
 134         hcd->regs = ci->hw_bank.abs;
 135         hcd->has_tt = 1;
 136
 137         hcd->power_budget = ci->platdata->power_budget;
 138         hcd->tpl_support = ci->platdata->tpl_support;
 139         if (ci->phy)
 140                 hcd->phy = ci->phy;
 141         else
 142                 hcd->usb_phy = ci->usb_phy;
 143
 144         ehci = hcd_to_ehci(hcd);
 145         ehci->caps = ci->hw_bank.cap;
 146         ehci->has_hostpc = ci->hw_bank.lpm;
 147         ehci->has_tdi_phy_lpm = ci->hw_bank.lpm;
 148         ehci->imx28_write_fix = ci->imx28_write_fix;
 149
 150         priv = (struct ehci_ci_priv *)ehci->priv;
 151         priv->reg_vbus = NULL;
 152
 153         if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci)) {
 154                 if (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON) {
 155                         ret = regulator_enable(ci->platdata->reg_vbus);
 156                         if (ret) {
 157                                 dev_err(ci->dev,
 158                                 "Failed to enable vbus regulator, ret=%d\n",
 159                                                                         ret);
 160                                 goto put_hcd;
 161                         }
 162                 } else {
 163                         priv->reg_vbus = ci->platdata->reg_vbus;
 164                 }
 165         }
 166
 167         ret = usb_add_hcd(hcd, 0, 0);
 168         if (ret) {
 169                 goto disable_reg;
 170         } else {
 171                 struct usb_otg *otg = &ci->otg;
 172
 173                 ci->hcd = hcd;
 174
 175                 if (ci_otg_is_fsm_mode(ci)) {
 176                         otg->host = &hcd->self;
 177                         hcd->self.otg_port = 1;
 178                 }
 179         }
 180
 181         return ret;
 182
 183 disable_reg:
 184         if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
 185                         (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
 186                 regulator_disable(ci->platdata->reg_vbus);
 187 put_hcd:
 188         usb_put_hcd(hcd);
 189
 190         return ret;
 191 }
 192
 193 static void host_stop(struct ci_hdrc *ci)
 194 {
 195         struct usb_hcd *hcd = ci->hcd;
 196
 197         if (hcd) {
 198                 if (ci->platdata->notify_event)
 199                         ci->platdata->notify_event(ci,
 200                                 CI_HDRC_CONTROLLER_STOPPED_EVENT);
 201                 usb_remove_hcd(hcd);
 202                 ci->role = CI_ROLE_END;
 203                 synchronize_irq(ci->irq);
 204                 usb_put_hcd(hcd);
 205                 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
 206                         (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
 207                                 regulator_disable(ci->platdata->reg_vbus);
 208         }
 209         ci->hcd = NULL;
 210         ci->otg.host = NULL;
 211 }
 212
 213
 214 void ci_hdrc_host_destroy(struct ci_hdrc *ci)
 215 {
 216         if (ci->role == CI_ROLE_HOST && ci->hcd)
 217                 host_stop(ci);
 218 }
 219
 220 static int ci_ehci_bus_suspend(struct usb_hcd *hcd)
 221 {
 222         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 223         int port;
 224         u32 tmp;
 225
 226         int ret = orig_bus_suspend(hcd);
 227
 228         if (ret)
 229                 return ret;
 230
 231         port = HCS_N_PORTS(ehci->hcs_params);
 232         while (port--) {
 233                 u32 __iomem *reg = &ehci->regs->port_status[port];
 234                 u32 portsc = ehci_readl(ehci, reg);
 235
 236                 if (portsc & PORT_CONNECT) {
 237                         /*
 238                          * For chipidea, the resume signal will be ended
 239                          * automatically, so for remote wakeup case, the
 240                          * usbcmd.rs may not be set before the resume has
 241                          * ended if other resume paths consumes too much
 242                          * time (~24ms), in that case, the SOF will not
 243                          * send out within 3ms after resume ends, then the
 244                          * high speed device will enter full speed mode.
 245                          */
 246
 247                         tmp = ehci_readl(ehci, &ehci->regs->command);
 248                         tmp |= CMD_RUN;
 249                         ehci_writel(ehci, tmp, &ehci->regs->command);
 250                         /*
 251                          * It needs a short delay between set RS bit and PHCD.
 252                          */
 253                         usleep_range(150, 200);
 254                         break;
 255                 }
 256         }
 257
 258         return 0;
 259 }
 260
 261 int ci_hdrc_host_init(struct ci_hdrc *ci)
 262 {
 263         struct ci_role_driver *rdrv;
 264
 265         if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC))
 266                 return -ENXIO;
 267
 268         rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
 269         if (!rdrv)
 270                 return -ENOMEM;
 271
 272         rdrv->start     = host_start;
 273         rdrv->stop      = host_stop;
 274         rdrv->irq       = host_irq;
 275         rdrv->name      = "host";
 276         ci->roles[CI_ROLE_HOST] = rdrv;
 277
 278         return 0;
 279 }
 280
 281 void ci_hdrc_host_driver_init(void)
 282 {
 283         ehci_init_driver(&ci_ehci_hc_driver, &ehci_ci_overrides);
 284         orig_bus_suspend = ci_ehci_hc_driver.bus_suspend;
 285         ci_ehci_hc_driver.bus_suspend = ci_ehci_bus_suspend;
 286 }