drivers/usb/host/ohci-ssb.c

   1 /*
   2  * Sonics Silicon Backplane
   3  * Broadcom USB-core OHCI driver
   4  *
   5  * Copyright 2007 Michael Buesch <m@bues.ch>
   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         if (hcd->driver->shutdown)
  97                 hcd->driver->shutdown(hcd);
  98         usb_remove_hcd(hcd);
  99         iounmap(hcd->regs);
 100         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 101         usb_put_hcd(hcd);
 102         ssb_device_disable(dev, 0);
 103 }
 104
 105 static int ssb_ohci_attach(struct ssb_device *dev)
 106 {
 107         struct ssb_ohci_device *ohcidev;
 108         struct usb_hcd *hcd;
 109         int err = -ENOMEM;
 110         u32 tmp, flags = 0;
 111
 112         if (dma_set_mask(dev->dma_dev, DMA_BIT_MASK(32)) ||
 113             dma_set_coherent_mask(dev->dma_dev, DMA_BIT_MASK(32)))
 114                 return -EOPNOTSUPP;
 115
 116         if (dev->id.coreid == SSB_DEV_USB11_HOSTDEV) {
 117                 /* Put the device into host-mode. */
 118                 flags |= SSB_OHCI_TMSLOW_HOSTMODE;
 119                 ssb_device_enable(dev, flags);
 120         } else if (dev->id.coreid == SSB_DEV_USB20_HOST) {
 121                 /*
 122                  * USB 2.0 special considerations:
 123                  *
 124                  * In addition to the standard SSB reset sequence, the Host
 125                  * Control Register must be programmed to bring the USB core
 126                  * and various phy components out of reset.
 127                  */
 128                 ssb_device_enable(dev, 0);
 129                 ssb_write32(dev, 0x200, 0x7ff);
 130
 131                 /* Change Flush control reg */
 132                 tmp = ssb_read32(dev, 0x400);
 133                 tmp &= ~8;
 134                 ssb_write32(dev, 0x400, tmp);
 135                 tmp = ssb_read32(dev, 0x400);
 136
 137                 /* Change Shim control reg */
 138                 tmp = ssb_read32(dev, 0x304);
 139                 tmp &= ~0x100;
 140                 ssb_write32(dev, 0x304, tmp);
 141                 tmp = ssb_read32(dev, 0x304);
 142
 143                 udelay(1);
 144
 145                 /* Work around for 5354 failures */
 146                 if (dev->id.revision == 2 && dev->bus->chip_id == 0x5354) {
 147                         /* Change syn01 reg */
 148                         tmp = 0x00fe00fe;
 149                         ssb_write32(dev, 0x894, tmp);
 150
 151                         /* Change syn03 reg */
 152                         tmp = ssb_read32(dev, 0x89c);
 153                         tmp |= 0x1;
 154                         ssb_write32(dev, 0x89c, tmp);
 155                 }
 156         } else
 157                 ssb_device_enable(dev, 0);
 158
 159         hcd = usb_create_hcd(&ssb_ohci_hc_driver, dev->dev,
 160                         dev_name(dev->dev));
 161         if (!hcd)
 162                 goto err_dev_disable;
 163         ohcidev = hcd_to_ssb_ohci(hcd);
 164         ohcidev->enable_flags = flags;
 165
 166         tmp = ssb_read32(dev, SSB_ADMATCH0);
 167         hcd->rsrc_start = ssb_admatch_base(tmp);
 168         hcd->rsrc_len = ssb_admatch_size(tmp);
 169         hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
 170         if (!hcd->regs)
 171                 goto err_put_hcd;
 172         err = usb_add_hcd(hcd, dev->irq, IRQF_SHARED);
 173         if (err)
 174                 goto err_iounmap;
 175
 176         ssb_set_drvdata(dev, hcd);
 177
 178         return err;
 179
 180 err_iounmap:
 181         iounmap(hcd->regs);
 182 err_put_hcd:
 183         usb_put_hcd(hcd);
 184 err_dev_disable:
 185         ssb_device_disable(dev, flags);
 186         return err;
 187 }
 188
 189 static int ssb_ohci_probe(struct ssb_device *dev,
 190                 const struct ssb_device_id *id)
 191 {
 192         int err;
 193         u16 chipid_top;
 194
 195         /* USBcores are only connected on embedded devices. */
 196         chipid_top = (dev->bus->chip_id & 0xFF00);
 197         if (chipid_top != 0x4700 && chipid_top != 0x5300)
 198                 return -ENODEV;
 199
 200         /* TODO: Probably need checks here; is the core connected? */
 201
 202         if (usb_disabled())
 203                 return -ENODEV;
 204
 205         /* We currently always attach SSB_DEV_USB11_HOSTDEV
 206          * as HOST OHCI. If we want to attach it as Client device,
 207          * we must branch here and call into the (yet to
 208          * be written) Client mode driver. Same for remove(). */
 209
 210         err = ssb_ohci_attach(dev);
 211
 212         return err;
 213 }
 214
 215 static void ssb_ohci_remove(struct ssb_device *dev)
 216 {
 217         ssb_ohci_detach(dev);
 218 }
 219
 220 #ifdef CONFIG_PM
 221
 222 static int ssb_ohci_suspend(struct ssb_device *dev, pm_message_t state)
 223 {
 224         ssb_device_disable(dev, 0);
 225
 226         return 0;
 227 }
 228
 229 static int ssb_ohci_resume(struct ssb_device *dev)
 230 {
 231         struct usb_hcd *hcd = ssb_get_drvdata(dev);
 232         struct ssb_ohci_device *ohcidev = hcd_to_ssb_ohci(hcd);
 233
 234         ssb_device_enable(dev, ohcidev->enable_flags);
 235
 236         ohci_finish_controller_resume(hcd);
 237         return 0;
 238 }
 239
 240 #else /* !CONFIG_PM */
 241 #define ssb_ohci_suspend        NULL
 242 #define ssb_ohci_resume NULL
 243 #endif /* CONFIG_PM */
 244
 245 static const struct ssb_device_id ssb_ohci_table[] = {
 246         SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB11_HOSTDEV, SSB_ANY_REV),
 247         SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB11_HOST, SSB_ANY_REV),
 248         SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB20_HOST, SSB_ANY_REV),
 249         SSB_DEVTABLE_END
 250 };
 251 MODULE_DEVICE_TABLE(ssb, ssb_ohci_table);
 252
 253 static struct ssb_driver ssb_ohci_driver = {
 254         .name           = KBUILD_MODNAME,
 255         .id_table       = ssb_ohci_table,
 256         .probe          = ssb_ohci_probe,
 257         .remove         = ssb_ohci_remove,
 258         .suspend        = ssb_ohci_suspend,
 259         .resume         = ssb_ohci_resume,
 260 };