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 static irqreturn_t host_irq(struct ci_hdrc *ci) 38 { 39 return usb_hcd_irq(ci->irq, ci->hcd); 40 } 41 42 static int host_start(struct ci_hdrc *ci) 43 { 44 struct usb_hcd *hcd; 45 struct ehci_hcd *ehci; 46 int ret; 47 48 if (usb_disabled()) 49 return -ENODEV; 50 51 hcd = usb_create_hcd(&ci_ehci_hc_driver, ci->dev, dev_name(ci->dev)); 52 if (!hcd) 53 return -ENOMEM; 54 55 dev_set_drvdata(ci->dev, ci); 56 hcd->rsrc_start = ci->hw_bank.phys; 57 hcd->rsrc_len = ci->hw_bank.size; 58 hcd->regs = ci->hw_bank.abs; 59 hcd->has_tt = 1; 60 61 hcd->power_budget = ci->platdata->power_budget; 62 hcd->phy = ci->transceiver; 63 64 ehci = hcd_to_ehci(hcd); 65 ehci->caps = ci->hw_bank.cap; 66 ehci->has_hostpc = ci->hw_bank.lpm; 67 ehci->has_tdi_phy_lpm = ci->hw_bank.lpm; 68 ehci->imx28_write_fix = ci->imx28_write_fix; 69 70 /* 71 * vbus is always on if host is not in OTG FSM mode, 72 * otherwise should be controlled by OTG FSM 73 */ 74 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci)) { 75 ret = regulator_enable(ci->platdata->reg_vbus); 76 if (ret) { 77 dev_err(ci->dev, 78 "Failed to enable vbus regulator, ret=%d\n", 79 ret); 80 goto put_hcd; 81 } 82 } 83 84 ret = usb_add_hcd(hcd, 0, 0); 85 if (ret) { 86 goto disable_reg; 87 } else { 88 struct usb_otg *otg = ci->transceiver->otg; 89 90 ci->hcd = hcd; 91 if (otg) { 92 otg->host = &hcd->self; 93 hcd->self.otg_port = 1; 94 } 95 } 96 97 if (ci->platdata->flags & CI_HDRC_DISABLE_STREAMING) 98 hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS, USBMODE_CI_SDIS); 99 100 return ret; 101 102 disable_reg: 103 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci)) 104 regulator_disable(ci->platdata->reg_vbus); 105 106 put_hcd: 107 usb_put_hcd(hcd); 108 109 return ret; 110 } 111 112 static void host_stop(struct ci_hdrc *ci) 113 { 114 struct usb_hcd *hcd = ci->hcd; 115 116 if (hcd) { 117 usb_remove_hcd(hcd); 118 usb_put_hcd(hcd); 119 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci)) 120 regulator_disable(ci->platdata->reg_vbus); 121 } 122 } 123 124 125 void ci_hdrc_host_destroy(struct ci_hdrc *ci) 126 { 127 if (ci->role == CI_ROLE_HOST && ci->hcd) 128 host_stop(ci); 129 } 130 131 int ci_hdrc_host_init(struct ci_hdrc *ci) 132 { 133 struct ci_role_driver *rdrv; 134 135 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC)) 136 return -ENXIO; 137 138 rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL); 139 if (!rdrv) 140 return -ENOMEM; 141 142 rdrv->start = host_start; 143 rdrv->stop = host_stop; 144 rdrv->irq = host_irq; 145 rdrv->name = "host"; 146 ci->roles[CI_ROLE_HOST] = rdrv; 147 148 ehci_init_driver(&ci_ehci_hc_driver, NULL); 149 150 return 0; 151 } 152