drivers/usb/host/ehci-msm.c

   1 /* ehci-msm.c - HSUSB Host Controller Driver Implementation
   2  *
   3  * Copyright (c) 2008-2011, Code Aurora Forum. All rights reserved.
   4  *
   5  * Partly derived from ehci-fsl.c and ehci-hcd.c
   6  * Copyright (c) 2000-2004 by David Brownell
   7  * Copyright (c) 2005 MontaVista Software
   8  *
   9  * All source code in this file is licensed under the following license except
  10  * where indicated.
  11  *
  12  * This program is free software; you can redistribute it and/or modify it
  13  * under the terms of the GNU General Public License version 2 as published
  14  * by the Free Software Foundation.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  19  *
  20  * See the GNU General Public License for more details.
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, you can find it at http://www.fsf.org
  23  */
  24
  25 #include <linux/platform_device.h>
  26 #include <linux/clk.h>
  27 #include <linux/err.h>
  28 #include <linux/pm_runtime.h>
  29
  30 #include <linux/usb/otg.h>
  31 #include <linux/usb/msm_hsusb_hw.h>
  32
  33 #define MSM_USB_BASE (hcd->regs)
  34
  35 static struct usb_phy *phy;
  36
  37 static int ehci_msm_reset(struct usb_hcd *hcd)
  38 {
  39         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  40         int retval;
  41
  42         ehci->caps = USB_CAPLENGTH;
  43         hcd->has_tt = 1;
  44
  45         retval = ehci_setup(hcd);
  46         if (retval)
  47                 return retval;
  48
  49         /* bursts of unspecified length. */
  50         writel(0, USB_AHBBURST);
  51         /* Use the AHB transactor */
  52         writel(0, USB_AHBMODE);
  53         /* Disable streaming mode and select host mode */
  54         writel(0x13, USB_USBMODE);
  55
  56         return 0;
  57 }
  58
  59 static struct hc_driver msm_hc_driver = {
  60         .description            = hcd_name,
  61         .product_desc           = "Qualcomm On-Chip EHCI Host Controller",
  62         .hcd_priv_size          = sizeof(struct ehci_hcd),
  63
  64         /*
  65          * generic hardware linkage
  66          */
  67         .irq                    = ehci_irq,
  68         .flags                  = HCD_USB2 | HCD_MEMORY,
  69
  70         .reset                  = ehci_msm_reset,
  71         .start                  = ehci_run,
  72
  73         .stop                   = ehci_stop,
  74         .shutdown               = ehci_shutdown,
  75
  76         /*
  77          * managing i/o requests and associated device resources
  78          */
  79         .urb_enqueue            = ehci_urb_enqueue,
  80         .urb_dequeue            = ehci_urb_dequeue,
  81         .endpoint_disable       = ehci_endpoint_disable,
  82         .endpoint_reset         = ehci_endpoint_reset,
  83         .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
  84
  85         /*
  86          * scheduling support
  87          */
  88         .get_frame_number       = ehci_get_frame,
  89
  90         /*
  91          * root hub support
  92          */
  93         .hub_status_data        = ehci_hub_status_data,
  94         .hub_control            = ehci_hub_control,
  95         .relinquish_port        = ehci_relinquish_port,
  96         .port_handed_over       = ehci_port_handed_over,
  97
  98         /*
  99          * PM support
 100          */
 101         .bus_suspend            = ehci_bus_suspend,
 102         .bus_resume             = ehci_bus_resume,
 103 };
 104
 105 static int ehci_msm_probe(struct platform_device *pdev)
 106 {
 107         struct usb_hcd *hcd;
 108         struct resource *res;
 109         int ret;
 110
 111         dev_dbg(&pdev->dev, "ehci_msm proble\n");
 112
 113         hcd = usb_create_hcd(&msm_hc_driver, &pdev->dev, dev_name(&pdev->dev));
 114         if (!hcd) {
 115                 dev_err(&pdev->dev, "Unable to create HCD\n");
 116                 return  -ENOMEM;
 117         }
 118
 119         hcd->irq = platform_get_irq(pdev, 0);
 120         if (hcd->irq < 0) {
 121                 dev_err(&pdev->dev, "Unable to get IRQ resource\n");
 122                 ret = hcd->irq;
 123                 goto put_hcd;
 124         }
 125
 126         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 127         if (!res) {
 128                 dev_err(&pdev->dev, "Unable to get memory resource\n");
 129                 ret = -ENODEV;
 130                 goto put_hcd;
 131         }
 132
 133         hcd->rsrc_start = res->start;
 134         hcd->rsrc_len = resource_size(res);
 135         hcd->regs = devm_ioremap(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len);
 136         if (!hcd->regs) {
 137                 dev_err(&pdev->dev, "ioremap failed\n");
 138                 ret = -ENOMEM;
 139                 goto put_hcd;
 140         }
 141
 142         /*
 143          * OTG driver takes care of PHY initialization, clock management,
 144          * powering up VBUS, mapping of registers address space and power
 145          * management.
 146          */
 147         phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
 148         if (IS_ERR_OR_NULL(phy)) {
 149                 dev_err(&pdev->dev, "unable to find transceiver\n");
 150                 ret = -ENODEV;
 151                 goto put_hcd;
 152         }
 153
 154         ret = otg_set_host(phy->otg, &hcd->self);
 155         if (ret < 0) {
 156                 dev_err(&pdev->dev, "unable to register with transceiver\n");
 157                 goto put_hcd;
 158         }
 159
 160         device_init_wakeup(&pdev->dev, 1);
 161         /*
 162          * OTG device parent of HCD takes care of putting
 163          * hardware into low power mode.
 164          */
 165         pm_runtime_no_callbacks(&pdev->dev);
 166         pm_runtime_enable(&pdev->dev);
 167
 168         return 0;
 169
 170 put_hcd:
 171         usb_put_hcd(hcd);
 172
 173         return ret;
 174 }
 175
 176 static int ehci_msm_remove(struct platform_device *pdev)
 177 {
 178         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 179
 180         device_init_wakeup(&pdev->dev, 0);
 181         pm_runtime_disable(&pdev->dev);
 182         pm_runtime_set_suspended(&pdev->dev);
 183
 184         otg_set_host(phy->otg, NULL);
 185
 186         usb_put_hcd(hcd);
 187
 188         return 0;
 189 }
 190
 191 #ifdef CONFIG_PM
 192 static int ehci_msm_pm_suspend(struct device *dev)
 193 {
 194         struct usb_hcd *hcd = dev_get_drvdata(dev);
 195         bool do_wakeup = device_may_wakeup(dev);
 196
 197         dev_dbg(dev, "ehci-msm PM suspend\n");
 198
 199         return ehci_suspend(hcd, do_wakeup);
 200 }
 201
 202 static int ehci_msm_pm_resume(struct device *dev)
 203 {
 204         struct usb_hcd *hcd = dev_get_drvdata(dev);
 205
 206         dev_dbg(dev, "ehci-msm PM resume\n");
 207         ehci_resume(hcd, false);
 208
 209         return 0;
 210 }
 211 #else
 212 #define ehci_msm_pm_suspend     NULL
 213 #define ehci_msm_pm_resume      NULL
 214 #endif
 215
 216 static const struct dev_pm_ops ehci_msm_dev_pm_ops = {
 217         .suspend         = ehci_msm_pm_suspend,
 218         .resume          = ehci_msm_pm_resume,
 219 };
 220
 221 static struct platform_driver ehci_msm_driver = {
 222         .probe  = ehci_msm_probe,
 223         .remove = ehci_msm_remove,
 224         .driver = {
 225                    .name = "msm_hsusb_host",
 226                    .pm = &ehci_msm_dev_pm_ops,
 227         },
 228 };