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 } 287