drivers/usb/host/ohci-ssb.c

   1 /*
   2  * Sonics Silicon Backplane
   3  * Broadcom USB-core OHCI driver
   4  *
   5  * Copyright 2007 Michael Buesch <mb@bu3sch.de>
   6  *
   7  * Derived from the OHCI-PCI driver
   8  * Copyright 1999 Roman Weissgaerber
   9  * Copyright 2000-2002 David Brownell
  10  * Copyright 1999 Linus Torvalds
  11  * Copyright 1999 Gregory P. Smith
  12  *
  13  * Derived from the USBcore related parts of Broadcom-SB
  14  * Copyright 2005 Broadcom Corporation
  15  *
  16  * Licensed under the GNU/GPL. See COPYING for details.
  17  */
  18 #include <linux/ssb/ssb.h>
  19
  20
  21 #define SSB_OHCI_TMSLOW_HOSTMODE        (1 << 29)
  22
  23 struct ssb_ohci_device {
  24         struct ohci_hcd ohci; /* _must_ be at the beginning. */
  25
  26         u32 enable_flags;
  27 };
  28
  29 static inline
  30 struct ssb_ohci_device *hcd_to_ssb_ohci(struct usb_hcd *hcd)
  31 {
  32         return (struct ssb_ohci_device *)(hcd->hcd_priv);
  33 }
  34
  35
  36 static int ssb_ohci_reset(struct usb_hcd *hcd)
  37 {
  38         struct ssb_ohci_device *ohcidev = hcd_to_ssb_ohci(hcd);
  39         struct ohci_hcd *ohci = &ohcidev->ohci;
  40         int err;
  41
  42         ohci_hcd_init(ohci);
  43         err = ohci_init(ohci);
  44
  45         return err;
  46 }
  47
  48 static int ssb_ohci_start(struct usb_hcd *hcd)
  49 {
  50         struct ssb_ohci_device *ohcidev = hcd_to_ssb_ohci(hcd);
  51         struct ohci_hcd *ohci = &ohcidev->ohci;
  52         int err;
  53
  54         err = ohci_run(ohci);
  55         if (err < 0) {
  56                 ohci_err(ohci, "can't start\n");
  57                 ohci_stop(hcd);
  58         }
  59
  60         return err;
  61 }
  62
  63 static const struct hc_driver ssb_ohci_hc_driver = {
  64         .description            = "ssb-usb-ohci",
  65         .product_desc           = "SSB OHCI Controller",
  66         .hcd_priv_size          = sizeof(struct ssb_ohci_device),
  67
  68         .irq                    = ohci_irq,
  69         .flags                  = HCD_MEMORY | HCD_USB11,
  70
  71         .reset                  = ssb_ohci_reset,
  72         .start                  = ssb_ohci_start,
  73         .stop                   = ohci_stop,
  74         .shutdown               = ohci_shutdown,
  75
  76         .urb_enqueue            = ohci_urb_enqueue,
  77         .urb_dequeue            = ohci_urb_dequeue,
  78         .endpoint_disable       = ohci_endpoint_disable,
  79
  80         .get_frame_number       = ohci_get_frame,
  81
  82         .hub_status_data        = ohci_hub_status_data,
  83         .hub_control            = ohci_hub_control,
  84 #ifdef  CONFIG_PM
  85         .bus_suspend            = ohci_bus_suspend,
  86         .bus_resume             = ohci_bus_resume,
  87 #endif
  88
  89         .start_port_reset       = ohci_start_port_reset,
  90 };
  91
  92 static void ssb_ohci_detach(struct ssb_device *dev)
  93 {
  94         struct usb_hcd *hcd = ssb_get_drvdata(dev);
  95
  96         usb_remove_hcd(hcd);
  97         iounmap(hcd->regs);
  98         usb_put_hcd(hcd);
  99         ssb_device_disable(dev, 0);
 100 }
 101
 102 static int ssb_ohci_attach(struct ssb_device *dev)
 103 {
 104         struct ssb_ohci_device *ohcidev;
 105         struct usb_hcd *hcd;
 106         int err = -ENOMEM;
 107         u32 tmp, flags = 0;
 108
 109         if (dev->id.coreid == SSB_DEV_USB11_HOSTDEV)
 110                 flags |= SSB_OHCI_TMSLOW_HOSTMODE;
 111
 112         ssb_device_enable(dev, flags);
 113
 114         hcd = usb_create_hcd(&ssb_ohci_hc_driver, dev->dev,
 115                         dev_name(dev->dev));
 116         if (!hcd)
 117                 goto err_dev_disable;
 118         ohcidev = hcd_to_ssb_ohci(hcd);
 119         ohcidev->enable_flags = flags;
 120
 121         tmp = ssb_read32(dev, SSB_ADMATCH0);
 122         hcd->rsrc_start = ssb_admatch_base(tmp);
 123         hcd->rsrc_len = ssb_admatch_size(tmp);
 124         hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
 125         if (!hcd->regs)
 126                 goto err_put_hcd;
 127         err = usb_add_hcd(hcd, dev->irq, IRQF_DISABLED | IRQF_SHARED);
 128         if (err)
 129                 goto err_iounmap;
 130
 131         ssb_set_drvdata(dev, hcd);
 132
 133         return err;
 134
 135 err_iounmap:
 136         iounmap(hcd->regs);
 137 err_put_hcd:
 138         usb_put_hcd(hcd);
 139 err_dev_disable:
 140         ssb_device_disable(dev, flags);
 141         return err;
 142 }
 143
 144 static int ssb_ohci_probe(struct ssb_device *dev,
 145                 const struct ssb_device_id *id)
 146 {
 147         int err;
 148         u16 chipid_top;
 149
 150         /* USBcores are only connected on embedded devices. */
 151         chipid_top = (dev->bus->chip_id & 0xFF00);
 152         if (chipid_top != 0x4700 && chipid_top != 0x5300)
 153                 return -ENODEV;
 154
 155         /* TODO: Probably need checks here; is the core connected? */
 156
 157         if (usb_disabled())
 158                 return -ENODEV;
 159
 160         /* We currently always attach SSB_DEV_USB11_HOSTDEV
 161          * as HOST OHCI. If we want to attach it as Client device,
 162          * we must branch here and call into the (yet to
 163          * be written) Client mode driver. Same for remove(). */
 164
 165         err = ssb_ohci_attach(dev);
 166
 167         return err;
 168 }
 169
 170 static void ssb_ohci_remove(struct ssb_device *dev)
 171 {
 172         ssb_ohci_detach(dev);
 173 }
 174
 175 #ifdef CONFIG_PM
 176
 177 static int ssb_ohci_suspend(struct ssb_device *dev, pm_message_t state)
 178 {
 179         ssb_device_disable(dev, 0);
 180
 181         return 0;
 182 }
 183
 184 static int ssb_ohci_resume(struct ssb_device *dev)
 185 {
 186         struct usb_hcd *hcd = ssb_get_drvdata(dev);
 187         struct ssb_ohci_device *ohcidev = hcd_to_ssb_ohci(hcd);
 188
 189         ssb_device_enable(dev, ohcidev->enable_flags);
 190
 191         ohci_finish_controller_resume(hcd);
 192         return 0;
 193 }
 194
 195 #else /* !CONFIG_PM */
 196 #define ssb_ohci_suspend        NULL
 197 #define ssb_ohci_resume NULL
 198 #endif /* CONFIG_PM */
 199
 200 static const struct ssb_device_id ssb_ohci_table[] = {
 201         SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB11_HOSTDEV, SSB_ANY_REV),
 202         SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB11_HOST, SSB_ANY_REV),
 203         SSB_DEVTABLE_END
 204 };
 205 MODULE_DEVICE_TABLE(ssb, ssb_ohci_table);
 206
 207 static struct ssb_driver ssb_ohci_driver = {
 208         .name           = KBUILD_MODNAME,
 209         .id_table       = ssb_ohci_table,
 210         .probe          = ssb_ohci_probe,
 211         .remove         = ssb_ohci_remove,
 212         .suspend        = ssb_ohci_suspend,
 213         .resume         = ssb_ohci_resume,
 214 };