target/linux/generic-2.6/files/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
  19 #include <linux/ssb/ssb.h>
  20
  21
  22 #define SSB_OHCI_TMSLOW_HOSTMODE        (1 << 29)
  23
  24 struct ssb_ohci_device {
  25         struct ohci_hcd ohci; /* _must_ be at the beginning. */
  26
  27         u32 enable_flags;
  28 };
  29
  30
  31 static inline
  32 struct ssb_ohci_device * hcd_to_ssb_ohci(struct usb_hcd *hcd)
  33 {
  34         return (struct ssb_ohci_device *)(hcd->hcd_priv);
  35 }
  36
  37
  38 static const struct ssb_device_id ssb_ohci_table[] = {
  39         SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB11_HOSTDEV, SSB_ANY_REV),
  40         SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB11_HOST, SSB_ANY_REV),
  41         SSB_DEVTABLE_END
  42 };
  43 MODULE_DEVICE_TABLE(ssb, ssb_ohci_table);
  44
  45
  46 static int ssb_ohci_reset(struct usb_hcd *hcd)
  47 {
  48         struct ssb_ohci_device *ohcidev = hcd_to_ssb_ohci(hcd);
  49         struct ohci_hcd *ohci = &ohcidev->ohci;
  50         int err;
  51
  52         ohci_hcd_init(ohci);
  53         err = ohci_init(ohci);
  54
  55         return err;
  56 }
  57
  58 static int ssb_ohci_start(struct usb_hcd *hcd)
  59 {
  60         struct ssb_ohci_device *ohcidev = hcd_to_ssb_ohci(hcd);
  61         struct ohci_hcd *ohci = &ohcidev->ohci;
  62         int err;
  63
  64         err = ohci_run(ohci);
  65         if (err < 0) {
  66                 ohci_err(ohci, "can't start\n");
  67                 ohci_stop(hcd);
  68         }
  69
  70         return err;
  71 }
  72
  73 #ifdef CONFIG_PM
  74 static int ssb_ohci_hcd_suspend(struct usb_hcd *hcd, pm_message_t message)
  75 {
  76         struct ssb_ohci_device *ohcidev = hcd_to_ssb_ohci(hcd);
  77         struct ohci_hcd *ohci = &ohcidev->ohci;
  78         unsigned long flags;
  79
  80         spin_lock_irqsave(&ohci->lock, flags);
  81
  82         ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
  83         ohci_readl(ohci, &ohci->regs->intrdisable); /* commit write */
  84
  85         /* make sure snapshot being resumed re-enumerates everything */
  86         if (message.event == PM_EVENT_PRETHAW)
  87                 ohci_usb_reset(ohci);
  88
  89         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
  90
  91         spin_unlock_irqrestore(&ohci->lock, flags);
  92
  93         return 0;
  94 }
  95
  96 static int ssb_ohci_hcd_resume(struct usb_hcd *hcd)
  97 {
  98         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
  99         usb_hcd_resume_root_hub(hcd);
 100         return 0;
 101 }
 102 #endif /* CONFIG_PM */
 103
 104 static const struct hc_driver ssb_ohci_hc_driver = {
 105         .description            = "ssb-usb-ohci",
 106         .product_desc           = "SSB OHCI Controller",
 107         .hcd_priv_size          = sizeof(struct ssb_ohci_device),
 108
 109         .irq                    = ohci_irq,
 110         .flags                  = HCD_MEMORY | HCD_USB11,
 111
 112         .reset                  = ssb_ohci_reset,
 113         .start                  = ssb_ohci_start,
 114         .stop                   = ohci_stop,
 115         .shutdown               = ohci_shutdown,
 116
 117 #ifdef CONFIG_PM
 118         .suspend                = ssb_ohci_hcd_suspend,
 119         .resume                 = ssb_ohci_hcd_resume,
 120 #endif
 121
 122         .urb_enqueue            = ohci_urb_enqueue,
 123         .urb_dequeue            = ohci_urb_dequeue,
 124         .endpoint_disable       = ohci_endpoint_disable,
 125
 126         .get_frame_number       = ohci_get_frame,
 127
 128         .hub_status_data        = ohci_hub_status_data,
 129         .hub_control            = ohci_hub_control,
 130         .hub_irq_enable         = ohci_rhsc_enable,
 131
 132 #ifdef CONFIG_PM
 133         .bus_suspend            = ohci_bus_suspend,
 134         .bus_resume             = ohci_bus_resume,
 135 #endif
 136
 137         .start_port_reset       = ohci_start_port_reset,
 138 };
 139
 140
 141 static void ssb_ohci_detach(struct ssb_device *dev)
 142 {
 143         struct usb_hcd *hcd = ssb_get_drvdata(dev);
 144
 145         usb_remove_hcd(hcd);
 146         iounmap(hcd->regs);
 147         usb_put_hcd(hcd);
 148         ssb_device_disable(dev, 0);
 149 }
 150
 151 static int ssb_ohci_attach(struct ssb_device *dev)
 152 {
 153         struct ssb_ohci_device *ohcidev;
 154         struct usb_hcd *hcd;
 155         int err = -ENOMEM;
 156         u32 tmp, flags = 0;
 157
 158         if (dev->id.coreid == SSB_DEV_USB11_HOSTDEV)
 159                 flags |= SSB_OHCI_TMSLOW_HOSTMODE;
 160
 161         ssb_device_enable(dev, flags);
 162
 163         hcd = usb_create_hcd(&ssb_ohci_hc_driver, dev->dev,
 164                              dev->dev->bus_id);
 165         if (!hcd)
 166                 goto err_dev_disable;
 167         ohcidev = hcd_to_ssb_ohci(hcd);
 168         ohcidev->enable_flags = flags;
 169
 170         tmp = ssb_read32(dev, SSB_ADMATCH0);
 171         hcd->rsrc_start = ssb_admatch_base(tmp);
 172         hcd->rsrc_len = ssb_admatch_size(tmp);
 173         hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
 174         if (!hcd->regs)
 175                 goto err_put_hcd;
 176         err = usb_add_hcd(hcd, dev->irq, IRQF_SHARED);
 177         if (err)
 178                 goto err_iounmap;
 179
 180         ssb_set_drvdata(dev, hcd);
 181
 182         return err;
 183
 184 err_iounmap:
 185         iounmap(hcd->regs);
 186 err_put_hcd:
 187         usb_put_hcd(hcd);
 188 err_dev_disable:
 189         ssb_device_disable(dev, flags);
 190         return err;
 191 }
 192
 193 static int ssb_ohci_probe(struct ssb_device *dev,
 194                           const struct ssb_device_id *id)
 195 {
 196         int err;
 197         u16 chipid_top;
 198
 199         chipid_top = (dev->bus->chip_id & 0xFF00);
 200         if (chipid_top != 0x4700 &&
 201             chipid_top != 0x5300) {
 202                 /* USBcores are only connected on embedded devices. */
 203                 return -ENODEV;
 204         }
 205         /* TODO: Probably need more checks here whether the core is connected. */
 206
 207         if (usb_disabled())
 208                 return -ENODEV;
 209
 210         /* We currently always attach SSB_DEV_USB11_HOSTDEV
 211          * as HOST OHCI. If we want to attach it as Client device,
 212          * we must branch here and call into the (yet to
 213          * be written) Client mode driver. Same for remove(). */
 214
 215         err = ssb_ohci_attach(dev);
 216
 217         return err;
 218 }
 219
 220 static void ssb_ohci_remove(struct ssb_device *dev)
 221 {
 222         ssb_ohci_detach(dev);
 223 }
 224
 225 #ifdef CONFIG_PM
 226 static int ssb_ohci_suspend(struct ssb_device *dev, pm_message_t state)
 227 {
 228         ssb_device_disable(dev, 0);
 229
 230         return 0;
 231 }
 232
 233 static int ssb_ohci_resume(struct ssb_device *dev)
 234 {
 235         struct usb_hcd *hcd = ssb_get_drvdata(dev);
 236         struct ssb_ohci_device *ohcidev = hcd_to_ssb_ohci(hcd);
 237
 238         ssb_device_enable(dev, ohcidev->enable_flags);
 239
 240         return 0;
 241 }
 242 #else /* CONFIG_PM */
 243 # define ssb_ohci_suspend       NULL
 244 # define ssb_ohci_resume        NULL
 245 #endif /* CONFIG_PM */
 246
 247 static struct ssb_driver ssb_ohci_driver = {
 248         .name           = KBUILD_MODNAME,
 249         .id_table       = ssb_ohci_table,
 250         .probe          = ssb_ohci_probe,
 251         .remove         = ssb_ohci_remove,
 252         .suspend        = ssb_ohci_suspend,
 253         .resume         = ssb_ohci_resume,
 254 };