drivers/usb/host/ssb-hcd.c

   1 /*
   2  * Sonics Silicon Backplane
   3  * Broadcom USB-core driver  (SSB bus glue)
   4  *
   5  * Copyright 2011-2012 Hauke Mehrtens <hauke@hauke-m.de>
   6  *
   7  * Based on ssb-ohci driver
   8  * Copyright 2007 Michael Buesch <m@bues.ch>
   9  *
  10  * Derived from the OHCI-PCI driver
  11  * Copyright 1999 Roman Weissgaerber
  12  * Copyright 2000-2002 David Brownell
  13  * Copyright 1999 Linus Torvalds
  14  * Copyright 1999 Gregory P. Smith
  15  *
  16  * Derived from the USBcore related parts of Broadcom-SB
  17  * Copyright 2005-2011 Broadcom Corporation
  18  *
  19  * Licensed under the GNU/GPL. See COPYING for details.
  20  */
  21 #include <linux/ssb/ssb.h>
  22 #include <linux/delay.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/module.h>
  25 #include <linux/slab.h>
  26 #include <linux/usb/ehci_pdriver.h>
  27 #include <linux/usb/ohci_pdriver.h>
  28
  29 MODULE_AUTHOR("Hauke Mehrtens");
  30 MODULE_DESCRIPTION("Common USB driver for SSB Bus");
  31 MODULE_LICENSE("GPL");
  32
  33 #define SSB_HCD_TMSLOW_HOSTMODE (1 << 29)
  34
  35 struct ssb_hcd_device {
  36         struct platform_device *ehci_dev;
  37         struct platform_device *ohci_dev;
  38
  39         u32 enable_flags;
  40 };
  41
  42 static void ssb_hcd_5354wa(struct ssb_device *dev)
  43 {
  44 #ifdef CONFIG_SSB_DRIVER_MIPS
  45         /* Work around for 5354 failures */
  46         if (dev->id.revision == 2 && dev->bus->chip_id == 0x5354) {
  47                 /* Change syn01 reg */
  48                 ssb_write32(dev, 0x894, 0x00fe00fe);
  49
  50                 /* Change syn03 reg */
  51                 ssb_write32(dev, 0x89c, ssb_read32(dev, 0x89c) | 0x1);
  52         }
  53 #endif
  54 }
  55
  56 static void ssb_hcd_usb20wa(struct ssb_device *dev)
  57 {
  58         if (dev->id.coreid == SSB_DEV_USB20_HOST) {
  59                 /*
  60                  * USB 2.0 special considerations:
  61                  *
  62                  * In addition to the standard SSB reset sequence, the Host
  63                  * Control Register must be programmed to bring the USB core
  64                  * and various phy components out of reset.
  65                  */
  66                 ssb_write32(dev, 0x200, 0x7ff);
  67
  68                 /* Change Flush control reg */
  69                 ssb_write32(dev, 0x400, ssb_read32(dev, 0x400) & ~8);
  70                 ssb_read32(dev, 0x400);
  71
  72                 /* Change Shim control reg */
  73                 ssb_write32(dev, 0x304, ssb_read32(dev, 0x304) & ~0x100);
  74                 ssb_read32(dev, 0x304);
  75
  76                 udelay(1);
  77
  78                 ssb_hcd_5354wa(dev);
  79         }
  80 }
  81
  82 /* based on arch/mips/brcm-boards/bcm947xx/pcibios.c */
  83 static u32 ssb_hcd_init_chip(struct ssb_device *dev)
  84 {
  85         u32 flags = 0;
  86
  87         if (dev->id.coreid == SSB_DEV_USB11_HOSTDEV)
  88                 /* Put the device into host-mode. */
  89                 flags |= SSB_HCD_TMSLOW_HOSTMODE;
  90
  91         ssb_device_enable(dev, flags);
  92
  93         ssb_hcd_usb20wa(dev);
  94
  95         return flags;
  96 }
  97
  98 static const struct usb_ehci_pdata ehci_pdata = {
  99 };
 100
 101 static const struct usb_ohci_pdata ohci_pdata = {
 102 };
 103
 104 static struct platform_device *ssb_hcd_create_pdev(struct ssb_device *dev, bool ohci, u32 addr, u32 len)
 105 {
 106         struct platform_device *hci_dev;
 107         struct resource hci_res[2];
 108         int ret;
 109
 110         memset(hci_res, 0, sizeof(hci_res));
 111
 112         hci_res[0].start = addr;
 113         hci_res[0].end = hci_res[0].start + len - 1;
 114         hci_res[0].flags = IORESOURCE_MEM;
 115
 116         hci_res[1].start = dev->irq;
 117         hci_res[1].flags = IORESOURCE_IRQ;
 118
 119         hci_dev = platform_device_alloc(ohci ? "ohci-platform" :
 120                                         "ehci-platform" , 0);
 121         if (!hci_dev)
 122                 return ERR_PTR(-ENOMEM);
 123
 124         hci_dev->dev.parent = dev->dev;
 125         hci_dev->dev.dma_mask = &hci_dev->dev.coherent_dma_mask;
 126
 127         ret = platform_device_add_resources(hci_dev, hci_res,
 128                                             ARRAY_SIZE(hci_res));
 129         if (ret)
 130                 goto err_alloc;
 131         if (ohci)
 132                 ret = platform_device_add_data(hci_dev, &ohci_pdata,
 133                                                sizeof(ohci_pdata));
 134         else
 135                 ret = platform_device_add_data(hci_dev, &ehci_pdata,
 136                                                sizeof(ehci_pdata));
 137         if (ret)
 138                 goto err_alloc;
 139         ret = platform_device_add(hci_dev);
 140         if (ret)
 141                 goto err_alloc;
 142
 143         return hci_dev;
 144
 145 err_alloc:
 146         platform_device_put(hci_dev);
 147         return ERR_PTR(ret);
 148 }
 149
 150 static int ssb_hcd_probe(struct ssb_device *dev,
 151                                    const struct ssb_device_id *id)
 152 {
 153         int err, tmp;
 154         int start, len;
 155         u16 chipid_top;
 156         u16 coreid = dev->id.coreid;
 157         struct ssb_hcd_device *usb_dev;
 158
 159         /* USBcores are only connected on embedded devices. */
 160         chipid_top = (dev->bus->chip_id & 0xFF00);
 161         if (chipid_top != 0x4700 && chipid_top != 0x5300)
 162                 return -ENODEV;
 163
 164         /* TODO: Probably need checks here; is the core connected? */
 165
 166         if (dma_set_mask_and_coherent(dev->dma_dev, DMA_BIT_MASK(32)))
 167                 return -EOPNOTSUPP;
 168
 169         usb_dev = devm_kzalloc(dev->dev, sizeof(struct ssb_hcd_device),
 170                                GFP_KERNEL);
 171         if (!usb_dev)
 172                 return -ENOMEM;
 173
 174         /* We currently always attach SSB_DEV_USB11_HOSTDEV
 175          * as HOST OHCI. If we want to attach it as Client device,
 176          * we must branch here and call into the (yet to
 177          * be written) Client mode driver. Same for remove(). */
 178         usb_dev->enable_flags = ssb_hcd_init_chip(dev);
 179
 180         tmp = ssb_read32(dev, SSB_ADMATCH0);
 181
 182         start = ssb_admatch_base(tmp);
 183         len = (coreid == SSB_DEV_USB20_HOST) ? 0x800 : ssb_admatch_size(tmp);
 184         usb_dev->ohci_dev = ssb_hcd_create_pdev(dev, true, start, len);
 185         if (IS_ERR(usb_dev->ohci_dev))
 186                 return PTR_ERR(usb_dev->ohci_dev);
 187
 188         if (coreid == SSB_DEV_USB20_HOST) {
 189                 start = ssb_admatch_base(tmp) + 0x800; /* ehci core offset */
 190                 usb_dev->ehci_dev = ssb_hcd_create_pdev(dev, false, start, len);
 191                 if (IS_ERR(usb_dev->ehci_dev)) {
 192                         err = PTR_ERR(usb_dev->ehci_dev);
 193                         goto err_unregister_ohci_dev;
 194                 }
 195         }
 196
 197         ssb_set_drvdata(dev, usb_dev);
 198         return 0;
 199
 200 err_unregister_ohci_dev:
 201         platform_device_unregister(usb_dev->ohci_dev);
 202         return err;
 203 }
 204
 205 static void ssb_hcd_remove(struct ssb_device *dev)
 206 {
 207         struct ssb_hcd_device *usb_dev = ssb_get_drvdata(dev);
 208         struct platform_device *ohci_dev = usb_dev->ohci_dev;
 209         struct platform_device *ehci_dev = usb_dev->ehci_dev;
 210
 211         if (ohci_dev)
 212                 platform_device_unregister(ohci_dev);
 213         if (ehci_dev)
 214                 platform_device_unregister(ehci_dev);
 215
 216         ssb_device_disable(dev, 0);
 217 }
 218
 219 static void ssb_hcd_shutdown(struct ssb_device *dev)
 220 {
 221         ssb_device_disable(dev, 0);
 222 }
 223
 224 #ifdef CONFIG_PM
 225
 226 static int ssb_hcd_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_hcd_resume(struct ssb_device *dev)
 234 {
 235         struct ssb_hcd_device *usb_dev = ssb_get_drvdata(dev);
 236
 237         ssb_device_enable(dev, usb_dev->enable_flags);
 238
 239         return 0;
 240 }
 241
 242 #else /* !CONFIG_PM */
 243 #define ssb_hcd_suspend NULL
 244 #define ssb_hcd_resume  NULL
 245 #endif /* CONFIG_PM */
 246
 247 static const struct ssb_device_id ssb_hcd_table[] = {
 248         SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB11_HOSTDEV, SSB_ANY_REV),
 249         SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB11_HOST, SSB_ANY_REV),
 250         SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB20_HOST, SSB_ANY_REV),
 251         {},
 252 };
 253 MODULE_DEVICE_TABLE(ssb, ssb_hcd_table);
 254
 255 static struct ssb_driver ssb_hcd_driver = {
 256         .name           = KBUILD_MODNAME,
 257         .id_table       = ssb_hcd_table,
 258         .probe          = ssb_hcd_probe,
 259         .remove         = ssb_hcd_remove,
 260         .shutdown       = ssb_hcd_shutdown,
 261         .suspend        = ssb_hcd_suspend,
 262         .resume         = ssb_hcd_resume,
 263 };
 264
 265 static int __init ssb_hcd_init(void)
 266 {
 267         return ssb_driver_register(&ssb_hcd_driver);
 268 }
 269 module_init(ssb_hcd_init);
 270
 271 static void __exit ssb_hcd_exit(void)
 272 {
 273         ssb_driver_unregister(&ssb_hcd_driver);
 274 }
 275 module_exit(ssb_hcd_exit);