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, dev_name(ci->dev)); 127 if (!hcd) 128 return -ENOMEM; 129 130 dev_set_drvdata(ci->dev, ci); 131 hcd->rsrc_start = ci->hw_bank.phys; 132 hcd->rsrc_len = ci->hw_bank.size; 133 hcd->regs = ci->hw_bank.abs; 134 hcd->has_tt = 1; 135 136 hcd->power_budget = ci->platdata->power_budget; 137 hcd->tpl_support = ci->platdata->tpl_support; 138 if (ci->phy) 139 hcd->phy = ci->phy; 140 else 141 hcd->usb_phy = ci->usb_phy; 142 143 ehci = hcd_to_ehci(hcd); 144 ehci->caps = ci->hw_bank.cap; 145 ehci->has_hostpc = ci->hw_bank.lpm; 146 ehci->has_tdi_phy_lpm = ci->hw_bank.lpm; 147 ehci->imx28_write_fix = ci->imx28_write_fix; 148 149 priv = (struct ehci_ci_priv *)ehci->priv; 150 priv->reg_vbus = NULL; 151 152 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci)) { 153 if (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON) { 154 ret = regulator_enable(ci->platdata->reg_vbus); 155 if (ret) { 156 dev_err(ci->dev, 157 "Failed to enable vbus regulator, ret=%d\n", 158 ret); 159 goto put_hcd; 160 } 161 } else { 162 priv->reg_vbus = ci->platdata->reg_vbus; 163 } 164 } 165 166 ret = usb_add_hcd(hcd, 0, 0); 167 if (ret) { 168 goto disable_reg; 169 } else { 170 struct usb_otg *otg = &ci->otg; 171 172 ci->hcd = hcd; 173 174 if (ci_otg_is_fsm_mode(ci)) { 175 otg->host = &hcd->self; 176 hcd->self.otg_port = 1; 177 } 178 } 179 180 return ret; 181 182 disable_reg: 183 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) && 184 (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON)) 185 regulator_disable(ci->platdata->reg_vbus); 186 put_hcd: 187 usb_put_hcd(hcd); 188 189 return ret; 190 } 191 192 static void host_stop(struct ci_hdrc *ci) 193 { 194 struct usb_hcd *hcd = ci->hcd; 195 196 if (hcd) { 197 if (ci->platdata->notify_event) 198 ci->platdata->notify_event(ci, 199 CI_HDRC_CONTROLLER_STOPPED_EVENT); 200 usb_remove_hcd(hcd); 201 ci->role = CI_ROLE_END; 202 synchronize_irq(ci->irq); 203 usb_put_hcd(hcd); 204 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) && 205 (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON)) 206 regulator_disable(ci->platdata->reg_vbus); 207 } 208 ci->hcd = NULL; 209 ci->otg.host = NULL; 210 } 211 212 213 void ci_hdrc_host_destroy(struct ci_hdrc *ci) 214 { 215 if (ci->role == CI_ROLE_HOST && ci->hcd) 216 host_stop(ci); 217 } 218 219 static int ci_ehci_bus_suspend(struct usb_hcd *hcd) 220 { 221 struct ehci_hcd *ehci = hcd_to_ehci(hcd); 222 int port; 223 u32 tmp; 224 225 int ret = orig_bus_suspend(hcd); 226 227 if (ret) 228 return ret; 229 230 port = HCS_N_PORTS(ehci->hcs_params); 231 while (port--) { 232 u32 __iomem *reg = &ehci->regs->port_status[port]; 233 u32 portsc = ehci_readl(ehci, reg); 234 235 if (portsc & PORT_CONNECT) { 236 /* 237 * For chipidea, the resume signal will be ended 238 * automatically, so for remote wakeup case, the 239 * usbcmd.rs may not be set before the resume has 240 * ended if other resume paths consumes too much 241 * time (~24ms), in that case, the SOF will not 242 * send out within 3ms after resume ends, then the 243 * high speed device will enter full speed mode. 244 */ 245 246 tmp = ehci_readl(ehci, &ehci->regs->command); 247 tmp |= CMD_RUN; 248 ehci_writel(ehci, tmp, &ehci->regs->command); 249 /* 250 * It needs a short delay between set RS bit and PHCD. 251 */ 252 usleep_range(150, 200); 253 break; 254 } 255 } 256 257 return 0; 258 } 259 260 int ci_hdrc_host_init(struct ci_hdrc *ci) 261 { 262 struct ci_role_driver *rdrv; 263 264 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC)) 265 return -ENXIO; 266 267 rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL); 268 if (!rdrv) 269 return -ENOMEM; 270 271 rdrv->start = host_start; 272 rdrv->stop = host_stop; 273 rdrv->irq = host_irq; 274 rdrv->name = "host"; 275 ci->roles[CI_ROLE_HOST] = rdrv; 276 277 return 0; 278 } 279 280 void ci_hdrc_host_driver_init(void) 281 { 282 ehci_init_driver(&ci_ehci_hc_driver, &ehci_ci_overrides); 283 orig_bus_suspend = ci_ehci_hc_driver.bus_suspend; 284 ci_ehci_hc_driver.bus_suspend = ci_ehci_bus_suspend; 285 } 286