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 37 struct ehci_ci_priv { 38 struct regulator *reg_vbus; 39 }; 40 41 static int ehci_ci_portpower(struct usb_hcd *hcd, int portnum, bool enable) 42 { 43 struct ehci_hcd *ehci = hcd_to_ehci(hcd); 44 struct ehci_ci_priv *priv = (struct ehci_ci_priv *)ehci->priv; 45 struct device *dev = hcd->self.controller; 46 struct ci_hdrc *ci = dev_get_drvdata(dev); 47 int ret = 0; 48 int port = HCS_N_PORTS(ehci->hcs_params); 49 50 if (priv->reg_vbus && !ci_otg_is_fsm_mode(ci)) { 51 if (port > 1) { 52 dev_warn(dev, 53 "Not support multi-port regulator control\n"); 54 return 0; 55 } 56 if (enable) 57 ret = regulator_enable(priv->reg_vbus); 58 else 59 ret = regulator_disable(priv->reg_vbus); 60 if (ret) { 61 dev_err(dev, 62 "Failed to %s vbus regulator, ret=%d\n", 63 enable ? "enable" : "disable", ret); 64 return ret; 65 } 66 } 67 return 0; 68 }; 69 70 static const struct ehci_driver_overrides ehci_ci_overrides = { 71 .extra_priv_size = sizeof(struct ehci_ci_priv), 72 .port_power = ehci_ci_portpower, 73 }; 74 75 static irqreturn_t host_irq(struct ci_hdrc *ci) 76 { 77 return usb_hcd_irq(ci->irq, ci->hcd); 78 } 79 80 static int host_start(struct ci_hdrc *ci) 81 { 82 struct usb_hcd *hcd; 83 struct ehci_hcd *ehci; 84 struct ehci_ci_priv *priv; 85 int ret; 86 87 if (usb_disabled()) 88 return -ENODEV; 89 90 hcd = usb_create_hcd(&ci_ehci_hc_driver, ci->dev, dev_name(ci->dev)); 91 if (!hcd) 92 return -ENOMEM; 93 94 dev_set_drvdata(ci->dev, ci); 95 hcd->rsrc_start = ci->hw_bank.phys; 96 hcd->rsrc_len = ci->hw_bank.size; 97 hcd->regs = ci->hw_bank.abs; 98 hcd->has_tt = 1; 99 100 hcd->power_budget = ci->platdata->power_budget; 101 hcd->tpl_support = ci->platdata->tpl_support; 102 if (ci->phy) 103 hcd->phy = ci->phy; 104 else 105 hcd->usb_phy = ci->usb_phy; 106 107 ehci = hcd_to_ehci(hcd); 108 ehci->caps = ci->hw_bank.cap; 109 ehci->has_hostpc = ci->hw_bank.lpm; 110 ehci->has_tdi_phy_lpm = ci->hw_bank.lpm; 111 ehci->imx28_write_fix = ci->imx28_write_fix; 112 113 priv = (struct ehci_ci_priv *)ehci->priv; 114 priv->reg_vbus = NULL; 115 116 if (ci->platdata->reg_vbus) 117 priv->reg_vbus = ci->platdata->reg_vbus; 118 119 ret = usb_add_hcd(hcd, 0, 0); 120 if (ret) { 121 goto put_hcd; 122 } else { 123 struct usb_otg *otg = &ci->otg; 124 125 ci->hcd = hcd; 126 127 if (ci_otg_is_fsm_mode(ci)) { 128 otg->host = &hcd->self; 129 hcd->self.otg_port = 1; 130 } 131 } 132 133 if (ci->platdata->flags & CI_HDRC_DISABLE_STREAMING) 134 hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS, USBMODE_CI_SDIS); 135 136 return ret; 137 138 put_hcd: 139 usb_put_hcd(hcd); 140 141 return ret; 142 } 143 144 static void host_stop(struct ci_hdrc *ci) 145 { 146 struct usb_hcd *hcd = ci->hcd; 147 148 if (hcd) { 149 usb_remove_hcd(hcd); 150 usb_put_hcd(hcd); 151 } 152 } 153 154 155 void ci_hdrc_host_destroy(struct ci_hdrc *ci) 156 { 157 if (ci->role == CI_ROLE_HOST && ci->hcd) 158 host_stop(ci); 159 } 160 161 int ci_hdrc_host_init(struct ci_hdrc *ci) 162 { 163 struct ci_role_driver *rdrv; 164 165 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC)) 166 return -ENXIO; 167 168 rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL); 169 if (!rdrv) 170 return -ENOMEM; 171 172 rdrv->start = host_start; 173 rdrv->stop = host_stop; 174 rdrv->irq = host_irq; 175 rdrv->name = "host"; 176 ci->roles[CI_ROLE_HOST] = rdrv; 177 178 ehci_init_driver(&ci_ehci_hc_driver, &ehci_ci_overrides); 179 180 return 0; 181 } 182