drivers/usb/chipidea/host.c

   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         if (ci->platdata->reg_vbus) {
  71                 ret = regulator_enable(ci->platdata->reg_vbus);
  72                 if (ret) {
  73                         dev_err(ci->dev,
  74                                 "Failed to enable vbus regulator, ret=%d\n",
  75                                 ret);
  76                         goto put_hcd;
  77                 }
  78         }
  79
  80         ret = usb_add_hcd(hcd, 0, 0);
  81         if (ret)
  82                 goto disable_reg;
  83         else
  84                 ci->hcd = hcd;
  85
  86         if (ci->platdata->flags & CI_HDRC_DISABLE_STREAMING)
  87                 hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS, USBMODE_CI_SDIS);
  88
  89         return ret;
  90
  91 disable_reg:
  92         if (ci->platdata->reg_vbus)
  93                 regulator_disable(ci->platdata->reg_vbus);
  94
  95 put_hcd:
  96         usb_put_hcd(hcd);
  97
  98         return ret;
  99 }
 100
 101 static void host_stop(struct ci_hdrc *ci)
 102 {
 103         struct usb_hcd *hcd = ci->hcd;
 104
 105         if (hcd) {
 106                 usb_remove_hcd(hcd);
 107                 usb_put_hcd(hcd);
 108         }
 109         if (ci->platdata->reg_vbus)
 110                 regulator_disable(ci->platdata->reg_vbus);
 111 }
 112
 113
 114 void ci_hdrc_host_destroy(struct ci_hdrc *ci)
 115 {
 116         if (ci->role == CI_ROLE_HOST)
 117                 host_stop(ci);
 118 }
 119
 120 int ci_hdrc_host_init(struct ci_hdrc *ci)
 121 {
 122         struct ci_role_driver *rdrv;
 123
 124         if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC))
 125                 return -ENXIO;
 126
 127         rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
 128         if (!rdrv)
 129                 return -ENOMEM;
 130
 131         rdrv->start     = host_start;
 132         rdrv->stop      = host_stop;
 133         rdrv->irq       = host_irq;
 134         rdrv->name      = "host";
 135         ci->roles[CI_ROLE_HOST] = rdrv;
 136
 137         ehci_init_driver(&ci_ehci_hc_driver, NULL);
 138
 139         return 0;
 140 }