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 } 276