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 otg_transceiver *otg;
  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         ehci->regs = USB_CAPLENGTH +
  44                 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
  45         dbg_hcs_params(ehci, "reset");
  46         dbg_hcc_params(ehci, "reset");
  47
  48         /* cache the data to minimize the chip reads*/
  49         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
  50
  51         hcd->has_tt = 1;
  52         ehci->sbrn = HCD_USB2;
  53
  54         retval = ehci_halt(ehci);
  55         if (retval)
  56                 return retval;
  57
  58         /* data structure init */
  59         retval = ehci_init(hcd);
  60         if (retval)
  61                 return retval;
  62
  63         retval = ehci_reset(ehci);
  64         if (retval)
  65                 return retval;
  66
  67         /* bursts of unspecified length. */
  68         writel(0, USB_AHBBURST);
  69         /* Use the AHB transactor */
  70         writel(0, USB_AHBMODE);
  71         /* Disable streaming mode and select host mode */
  72         writel(0x13, USB_USBMODE);
  73
  74         ehci_port_power(ehci, 1);
  75         return 0;
  76 }
  77
  78 static struct hc_driver msm_hc_driver = {
  79         .description            = hcd_name,
  80         .product_desc           = "Qualcomm On-Chip EHCI Host Controller",
  81         .hcd_priv_size          = sizeof(struct ehci_hcd),
  82
  83         /*
  84          * generic hardware linkage
  85          */
  86         .irq                    = ehci_irq,
  87         .flags                  = HCD_USB2 | HCD_MEMORY,
  88
  89         .reset                  = ehci_msm_reset,
  90         .start                  = ehci_run,
  91
  92         .stop                   = ehci_stop,
  93         .shutdown               = ehci_shutdown,
  94
  95         /*
  96          * managing i/o requests and associated device resources
  97          */
  98         .urb_enqueue            = ehci_urb_enqueue,
  99         .urb_dequeue            = ehci_urb_dequeue,
 100         .endpoint_disable       = ehci_endpoint_disable,
 101         .endpoint_reset         = ehci_endpoint_reset,
 102         .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
 103
 104         /*
 105          * scheduling support
 106          */
 107         .get_frame_number       = ehci_get_frame,
 108
 109         /*
 110          * root hub support
 111          */
 112         .hub_status_data        = ehci_hub_status_data,
 113         .hub_control            = ehci_hub_control,
 114         .relinquish_port        = ehci_relinquish_port,
 115         .port_handed_over       = ehci_port_handed_over,
 116
 117         /*
 118          * PM support
 119          */
 120         .bus_suspend            = ehci_bus_suspend,
 121         .bus_resume             = ehci_bus_resume,
 122 };
 123
 124 static int ehci_msm_probe(struct platform_device *pdev)
 125 {
 126         struct usb_hcd *hcd;
 127         struct resource *res;
 128         int ret;
 129
 130         dev_dbg(&pdev->dev, "ehci_msm proble\n");
 131
 132         hcd = usb_create_hcd(&msm_hc_driver, &pdev->dev, dev_name(&pdev->dev));
 133         if (!hcd) {
 134                 dev_err(&pdev->dev, "Unable to create HCD\n");
 135                 return  -ENOMEM;
 136         }
 137
 138         hcd->irq = platform_get_irq(pdev, 0);
 139         if (hcd->irq < 0) {
 140                 dev_err(&pdev->dev, "Unable to get IRQ resource\n");
 141                 ret = hcd->irq;
 142                 goto put_hcd;
 143         }
 144
 145         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 146         if (!res) {
 147                 dev_err(&pdev->dev, "Unable to get memory resource\n");
 148                 ret = -ENODEV;
 149                 goto put_hcd;
 150         }
 151
 152         hcd->rsrc_start = res->start;
 153         hcd->rsrc_len = resource_size(res);
 154         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 155         if (!hcd->regs) {
 156                 dev_err(&pdev->dev, "ioremap failed\n");
 157                 ret = -ENOMEM;
 158                 goto put_hcd;
 159         }
 160
 161         /*
 162          * OTG driver takes care of PHY initialization, clock management,
 163          * powering up VBUS, mapping of registers address space and power
 164          * management.
 165          */
 166         otg = otg_get_transceiver();
 167         if (!otg) {
 168                 dev_err(&pdev->dev, "unable to find transceiver\n");
 169                 ret = -ENODEV;
 170                 goto unmap;
 171         }
 172
 173         ret = otg_set_host(otg, &hcd->self);
 174         if (ret < 0) {
 175                 dev_err(&pdev->dev, "unable to register with transceiver\n");
 176                 goto put_transceiver;
 177         }
 178
 179         device_init_wakeup(&pdev->dev, 1);
 180         /*
 181          * OTG device parent of HCD takes care of putting
 182          * hardware into low power mode.
 183          */
 184         pm_runtime_no_callbacks(&pdev->dev);
 185         pm_runtime_enable(&pdev->dev);
 186
 187         return 0;
 188
 189 put_transceiver:
 190         otg_put_transceiver(otg);
 191 unmap:
 192         iounmap(hcd->regs);
 193 put_hcd:
 194         usb_put_hcd(hcd);
 195
 196         return ret;
 197 }
 198
 199 static int __devexit ehci_msm_remove(struct platform_device *pdev)
 200 {
 201         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 202
 203         device_init_wakeup(&pdev->dev, 0);
 204         pm_runtime_disable(&pdev->dev);
 205         pm_runtime_set_suspended(&pdev->dev);
 206
 207         otg_set_host(otg, NULL);
 208         otg_put_transceiver(otg);
 209
 210         usb_put_hcd(hcd);
 211
 212         return 0;
 213 }
 214
 215 #ifdef CONFIG_PM
 216 static int ehci_msm_pm_suspend(struct device *dev)
 217 {
 218         struct usb_hcd *hcd = dev_get_drvdata(dev);
 219         bool wakeup = device_may_wakeup(dev);
 220
 221         dev_dbg(dev, "ehci-msm PM suspend\n");
 222
 223         /*
 224          * EHCI helper function has also the same check before manipulating
 225          * port wakeup flags.  We do check here the same condition before
 226          * calling the same helper function to avoid bringing hardware
 227          * from Low power mode when there is no need for adjusting port
 228          * wakeup flags.
 229          */
 230         if (hcd->self.root_hub->do_remote_wakeup && !wakeup) {
 231                 pm_runtime_resume(dev);
 232                 ehci_prepare_ports_for_controller_suspend(hcd_to_ehci(hcd),
 233                                 wakeup);
 234         }
 235
 236         return 0;
 237 }
 238
 239 static int ehci_msm_pm_resume(struct device *dev)
 240 {
 241         struct usb_hcd *hcd = dev_get_drvdata(dev);
 242
 243         dev_dbg(dev, "ehci-msm PM resume\n");
 244         ehci_prepare_ports_for_controller_resume(hcd_to_ehci(hcd));
 245
 246         return 0;
 247 }
 248 #else
 249 #define ehci_msm_pm_suspend     NULL
 250 #define ehci_msm_pm_resume      NULL
 251 #endif
 252
 253 static const struct dev_pm_ops ehci_msm_dev_pm_ops = {
 254         .suspend         = ehci_msm_pm_suspend,
 255         .resume          = ehci_msm_pm_resume,
 256 };
 257
 258 static struct platform_driver ehci_msm_driver = {
 259         .probe  = ehci_msm_probe,
 260         .remove = __devexit_p(ehci_msm_remove),
 261         .driver = {
 262                    .name = "msm_hsusb_host",
 263                    .pm = &ehci_msm_dev_pm_ops,
 264         },
 265 };