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 #ifdef CONFIG_PM
  64 static int ssb_ohci_hcd_suspend(struct usb_hcd *hcd, pm_message_t message)
  65 {
  66         struct ssb_ohci_device *ohcidev = hcd_to_ssb_ohci(hcd);
  67         struct ohci_hcd *ohci = &ohcidev->ohci;
  68         unsigned long flags;
  69
  70         spin_lock_irqsave(&ohci->lock, flags);
  71
  72         ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
  73         ohci_readl(ohci, &ohci->regs->intrdisable); /* commit write */
  74
  75         /* make sure snapshot being resumed re-enumerates everything */
  76         if (message.event == PM_EVENT_PRETHAW)
  77                 ohci_usb_reset(ohci);
  78
  79         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
  80
  81         spin_unlock_irqrestore(&ohci->lock, flags);
  82         return 0;
  83 }
  84
  85 static int ssb_ohci_hcd_resume(struct usb_hcd *hcd)
  86 {
  87         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
  88         usb_hcd_resume_root_hub(hcd);
  89         return 0;
  90 }
  91 #endif /* CONFIG_PM */
  92
  93 static const struct hc_driver ssb_ohci_hc_driver = {
  94         .description            = "ssb-usb-ohci",
  95         .product_desc           = "SSB OHCI Controller",
  96         .hcd_priv_size          = sizeof(struct ssb_ohci_device),
  97
  98         .irq                    = ohci_irq,
  99         .flags                  = HCD_MEMORY | HCD_USB11,
 100
 101         .reset                  = ssb_ohci_reset,
 102         .start                  = ssb_ohci_start,
 103         .stop                   = ohci_stop,
 104         .shutdown               = ohci_shutdown,
 105
 106 #ifdef CONFIG_PM
 107         .suspend                = ssb_ohci_hcd_suspend,
 108         .resume                 = ssb_ohci_hcd_resume,
 109 #endif
 110
 111         .urb_enqueue            = ohci_urb_enqueue,
 112         .urb_dequeue            = ohci_urb_dequeue,
 113         .endpoint_disable       = ohci_endpoint_disable,
 114
 115         .get_frame_number       = ohci_get_frame,
 116
 117         .hub_status_data        = ohci_hub_status_data,
 118         .hub_control            = ohci_hub_control,
 119         .hub_irq_enable         = ohci_rhsc_enable,
 120         .bus_suspend            = ohci_bus_suspend,
 121         .bus_resume             = ohci_bus_resume,
 122
 123         .start_port_reset       = ohci_start_port_reset,
 124 };
 125
 126 static void ssb_ohci_detach(struct ssb_device *dev)
 127 {
 128         struct usb_hcd *hcd = ssb_get_drvdata(dev);
 129
 130         usb_remove_hcd(hcd);
 131         iounmap(hcd->regs);
 132         usb_put_hcd(hcd);
 133         ssb_device_disable(dev, 0);
 134 }
 135
 136 static int ssb_ohci_attach(struct ssb_device *dev)
 137 {
 138         struct ssb_ohci_device *ohcidev;
 139         struct usb_hcd *hcd;
 140         int err = -ENOMEM;
 141         u32 tmp, flags = 0;
 142
 143         if (dev->id.coreid == SSB_DEV_USB11_HOSTDEV)
 144                 flags |= SSB_OHCI_TMSLOW_HOSTMODE;
 145
 146         ssb_device_enable(dev, flags);
 147
 148         hcd = usb_create_hcd(&ssb_ohci_hc_driver, dev->dev,
 149                         dev->dev->bus_id);
 150         if (!hcd)
 151                 goto err_dev_disable;
 152         ohcidev = hcd_to_ssb_ohci(hcd);
 153         ohcidev->enable_flags = flags;
 154
 155         tmp = ssb_read32(dev, SSB_ADMATCH0);
 156         hcd->rsrc_start = ssb_admatch_base(tmp);
 157         hcd->rsrc_len = ssb_admatch_size(tmp);
 158         hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
 159         if (!hcd->regs)
 160                 goto err_put_hcd;
 161         err = usb_add_hcd(hcd, dev->irq, IRQF_SHARED);
 162         if (err)
 163                 goto err_iounmap;
 164
 165         ssb_set_drvdata(dev, hcd);
 166
 167         return err;
 168
 169 err_iounmap:
 170         iounmap(hcd->regs);
 171 err_put_hcd:
 172         usb_put_hcd(hcd);
 173 err_dev_disable:
 174         ssb_device_disable(dev, flags);
 175         return err;
 176 }
 177
 178 static int ssb_ohci_probe(struct ssb_device *dev,
 179                 const struct ssb_device_id *id)
 180 {
 181         int err;
 182         u16 chipid_top;
 183
 184         /* USBcores are only connected on embedded devices. */
 185         chipid_top = (dev->bus->chip_id & 0xFF00);
 186         if (chipid_top != 0x4700 && chipid_top != 0x5300)
 187                 return -ENODEV;
 188
 189         /* TODO: Probably need checks here; is the core connected? */
 190
 191         if (usb_disabled())
 192                 return -ENODEV;
 193
 194         /* We currently always attach SSB_DEV_USB11_HOSTDEV
 195          * as HOST OHCI. If we want to attach it as Client device,
 196          * we must branch here and call into the (yet to
 197          * be written) Client mode driver. Same for remove(). */
 198
 199         err = ssb_ohci_attach(dev);
 200
 201         return err;
 202 }
 203
 204 static void ssb_ohci_remove(struct ssb_device *dev)
 205 {
 206         ssb_ohci_detach(dev);
 207 }
 208
 209 #ifdef CONFIG_PM
 210
 211 static int ssb_ohci_suspend(struct ssb_device *dev, pm_message_t state)
 212 {
 213         ssb_device_disable(dev, 0);
 214
 215         return 0;
 216 }
 217
 218 static int ssb_ohci_resume(struct ssb_device *dev)
 219 {
 220         struct usb_hcd *hcd = ssb_get_drvdata(dev);
 221         struct ssb_ohci_device *ohcidev = hcd_to_ssb_ohci(hcd);
 222
 223         ssb_device_enable(dev, ohcidev->enable_flags);
 224
 225         return 0;
 226 }
 227
 228 #else /* !CONFIG_PM */
 229 #define ssb_ohci_suspend        NULL
 230 #define ssb_ohci_resume NULL
 231 #endif /* CONFIG_PM */
 232
 233 static const struct ssb_device_id ssb_ohci_table[] = {
 234         SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB11_HOSTDEV, SSB_ANY_REV),
 235         SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB11_HOST, SSB_ANY_REV),
 236         SSB_DEVTABLE_END
 237 };
 238 MODULE_DEVICE_TABLE(ssb, ssb_ohci_table);
 239
 240 static struct ssb_driver ssb_ohci_driver = {
 241         .name           = KBUILD_MODNAME,
 242         .id_table       = ssb_ohci_table,
 243         .probe          = ssb_ohci_probe,
 244         .remove         = ssb_ohci_remove,
 245         .suspend        = ssb_ohci_suspend,
 246         .resume         = ssb_ohci_resume,
 247 };