drivers/usb/host/ssb-hcd.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Sonics Silicon Backplane
   4  * Broadcom USB-core driver  (SSB bus glue)
   5  *
   6  * Copyright 2011-2012 Hauke Mehrtens <hauke@hauke-m.de>
   7  *
   8  * Based on ssb-ohci driver
   9  * Copyright 2007 Michael Buesch <m@bues.ch>
  10  *
  11  * Derived from the OHCI-PCI driver
  12  * Copyright 1999 Roman Weissgaerber
  13  * Copyright 2000-2002 David Brownell
  14  * Copyright 1999 Linus Torvalds
  15  * Copyright 1999 Gregory P. Smith
  16  *
  17  * Derived from the USBcore related parts of Broadcom-SB
  18  * Copyright 2005-2011 Broadcom Corporation
  19  */
  20 #include <linux/ssb/ssb.h>
  21 #include <linux/delay.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/module.h>
  24 #include <linux/slab.h>
  25 #include <linux/usb/ehci_pdriver.h>
  26 #include <linux/usb/ohci_pdriver.h>
  27
  28 MODULE_AUTHOR("Hauke Mehrtens");
  29 MODULE_DESCRIPTION("Common USB driver for SSB Bus");
  30 MODULE_LICENSE("GPL");
  31
  32 #define SSB_HCD_TMSLOW_HOSTMODE (1 << 29)
  33
  34 struct ssb_hcd_device {
  35         struct platform_device *ehci_dev;
  36         struct platform_device *ohci_dev;
  37
  38         u32 enable_flags;
  39 };
  40
  41 static void ssb_hcd_5354wa(struct ssb_device *dev)
  42 {
  43 #ifdef CONFIG_SSB_DRIVER_MIPS
  44         /* Work around for 5354 failures */
  45         if (dev->id.revision == 2 && dev->bus->chip_id == 0x5354) {
  46                 /* Change syn01 reg */
  47                 ssb_write32(dev, 0x894, 0x00fe00fe);
  48
  49                 /* Change syn03 reg */
  50                 ssb_write32(dev, 0x89c, ssb_read32(dev, 0x89c) | 0x1);
  51         }
  52 #endif
  53 }
  54
  55 static void ssb_hcd_usb20wa(struct ssb_device *dev)
  56 {
  57         if (dev->id.coreid == SSB_DEV_USB20_HOST) {
  58                 /*
  59                  * USB 2.0 special considerations:
  60                  *
  61                  * In addition to the standard SSB reset sequence, the Host
  62                  * Control Register must be programmed to bring the USB core
  63                  * and various phy components out of reset.
  64                  */
  65                 ssb_write32(dev, 0x200, 0x7ff);
  66
  67                 /* Change Flush control reg */
  68                 ssb_write32(dev, 0x400, ssb_read32(dev, 0x400) & ~8);
  69                 ssb_read32(dev, 0x400);
  70
  71                 /* Change Shim control reg */
  72                 ssb_write32(dev, 0x304, ssb_read32(dev, 0x304) & ~0x100);
  73                 ssb_read32(dev, 0x304);
  74
  75                 udelay(1);
  76
  77                 ssb_hcd_5354wa(dev);
  78         }
  79 }
  80
  81 /* based on arch/mips/brcm-boards/bcm947xx/pcibios.c */
  82 static u32 ssb_hcd_init_chip(struct ssb_device *dev)
  83 {
  84         u32 flags = 0;
  85
  86         if (dev->id.coreid == SSB_DEV_USB11_HOSTDEV)
  87                 /* Put the device into host-mode. */
  88                 flags |= SSB_HCD_TMSLOW_HOSTMODE;
  89
  90         ssb_device_enable(dev, flags);
  91
  92         ssb_hcd_usb20wa(dev);
  93
  94         return flags;
  95 }
  96
  97 static const struct usb_ehci_pdata ehci_pdata = {
  98 };
  99
 100 static const struct usb_ohci_pdata ohci_pdata = {
 101 };
 102
 103 static struct platform_device *ssb_hcd_create_pdev(struct ssb_device *dev, bool ohci, u32 addr, u32 len)
 104 {
 105         struct platform_device *hci_dev;
 106         struct resource hci_res[2];
 107         int ret;
 108
 109         memset(hci_res, 0, sizeof(hci_res));
 110
 111         hci_res[0].start = addr;
 112         hci_res[0].end = hci_res[0].start + len - 1;
 113         hci_res[0].flags = IORESOURCE_MEM;
 114
 115         hci_res[1].start = dev->irq;
 116         hci_res[1].flags = IORESOURCE_IRQ;
 117
 118         hci_dev = platform_device_alloc(ohci ? "ohci-platform" :
 119                                         "ehci-platform" , 0);
 120         if (!hci_dev)
 121                 return ERR_PTR(-ENOMEM);
 122
 123         hci_dev->dev.parent = dev->dev;
 124         hci_dev->dev.dma_mask = &hci_dev->dev.coherent_dma_mask;
 125
 126         ret = platform_device_add_resources(hci_dev, hci_res,
 127                                             ARRAY_SIZE(hci_res));
 128         if (ret)
 129                 goto err_alloc;
 130         if (ohci)
 131                 ret = platform_device_add_data(hci_dev, &ohci_pdata,
 132                                                sizeof(ohci_pdata));
 133         else
 134                 ret = platform_device_add_data(hci_dev, &ehci_pdata,
 135                                                sizeof(ehci_pdata));
 136         if (ret)
 137                 goto err_alloc;
 138         ret = platform_device_add(hci_dev);
 139         if (ret)
 140                 goto err_alloc;
 141
 142         return hci_dev;
 143
 144 err_alloc:
 145         platform_device_put(hci_dev);
 146         return ERR_PTR(ret);
 147 }
 148
 149 static int ssb_hcd_probe(struct ssb_device *dev,
 150                                    const struct ssb_device_id *id)
 151 {
 152         int err, tmp;
 153         int start, len;
 154         u16 chipid_top;
 155         u16 coreid = dev->id.coreid;
 156         struct ssb_hcd_device *usb_dev;
 157
 158         /* USBcores are only connected on embedded devices. */
 159         chipid_top = (dev->bus->chip_id & 0xFF00);
 160         if (chipid_top != 0x4700 && chipid_top != 0x5300)
 161                 return -ENODEV;
 162
 163         /* TODO: Probably need checks here; is the core connected? */
 164
 165         if (dma_set_mask_and_coherent(dev->dma_dev, DMA_BIT_MASK(32)))
 166                 return -EOPNOTSUPP;
 167
 168         usb_dev = devm_kzalloc(dev->dev, sizeof(struct ssb_hcd_device),
 169                                GFP_KERNEL);
 170         if (!usb_dev)
 171                 return -ENOMEM;
 172
 173         /* We currently always attach SSB_DEV_USB11_HOSTDEV
 174          * as HOST OHCI. If we want to attach it as Client device,
 175          * we must branch here and call into the (yet to
 176          * be written) Client mode driver. Same for remove(). */
 177         usb_dev->enable_flags = ssb_hcd_init_chip(dev);
 178
 179         tmp = ssb_read32(dev, SSB_ADMATCH0);
 180
 181         start = ssb_admatch_base(tmp);
 182         len = (coreid == SSB_DEV_USB20_HOST) ? 0x800 : ssb_admatch_size(tmp);
 183         usb_dev->ohci_dev = ssb_hcd_create_pdev(dev, true, start, len);
 184         if (IS_ERR(usb_dev->ohci_dev))
 185                 return PTR_ERR(usb_dev->ohci_dev);
 186
 187         if (coreid == SSB_DEV_USB20_HOST) {
 188                 start = ssb_admatch_base(tmp) + 0x800; /* ehci core offset */
 189                 usb_dev->ehci_dev = ssb_hcd_create_pdev(dev, false, start, len);
 190                 if (IS_ERR(usb_dev->ehci_dev)) {
 191                         err = PTR_ERR(usb_dev->ehci_dev);
 192                         goto err_unregister_ohci_dev;
 193                 }
 194         }
 195
 196         ssb_set_drvdata(dev, usb_dev);
 197         return 0;
 198
 199 err_unregister_ohci_dev:
 200         platform_device_unregister(usb_dev->ohci_dev);
 201         return err;
 202 }
 203
 204 static void ssb_hcd_remove(struct ssb_device *dev)
 205 {
 206         struct ssb_hcd_device *usb_dev = ssb_get_drvdata(dev);
 207         struct platform_device *ohci_dev = usb_dev->ohci_dev;
 208         struct platform_device *ehci_dev = usb_dev->ehci_dev;
 209
 210         if (ohci_dev)
 211                 platform_device_unregister(ohci_dev);
 212         if (ehci_dev)
 213                 platform_device_unregister(ehci_dev);
 214
 215         ssb_device_disable(dev, 0);
 216 }
 217
 218 static void ssb_hcd_shutdown(struct ssb_device *dev)
 219 {
 220         ssb_device_disable(dev, 0);
 221 }
 222
 223 #ifdef CONFIG_PM
 224
 225 static int ssb_hcd_suspend(struct ssb_device *dev, pm_message_t state)
 226 {
 227         ssb_device_disable(dev, 0);
 228
 229         return 0;
 230 }
 231
 232 static int ssb_hcd_resume(struct ssb_device *dev)
 233 {
 234         struct ssb_hcd_device *usb_dev = ssb_get_drvdata(dev);
 235
 236         ssb_device_enable(dev, usb_dev->enable_flags);
 237
 238         return 0;
 239 }
 240
 241 #else /* !CONFIG_PM */
 242 #define ssb_hcd_suspend NULL
 243 #define ssb_hcd_resume  NULL
 244 #endif /* CONFIG_PM */
 245
 246 static const struct ssb_device_id ssb_hcd_table[] = {
 247         SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB11_HOSTDEV, SSB_ANY_REV),
 248         SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB11_HOST, SSB_ANY_REV),
 249         SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB20_HOST, SSB_ANY_REV),
 250         {},
 251 };
 252 MODULE_DEVICE_TABLE(ssb, ssb_hcd_table);
 253
 254 static struct ssb_driver ssb_hcd_driver = {
 255         .name           = KBUILD_MODNAME,
 256         .id_table       = ssb_hcd_table,
 257         .probe          = ssb_hcd_probe,
 258         .remove         = ssb_hcd_remove,
 259         .shutdown       = ssb_hcd_shutdown,
 260         .suspend        = ssb_hcd_suspend,
 261         .resume         = ssb_hcd_resume,
 262 };
 263
 264 static int __init ssb_hcd_init(void)
 265 {
 266         return ssb_driver_register(&ssb_hcd_driver);
 267 }
 268 module_init(ssb_hcd_init);
 269
 270 static void __exit ssb_hcd_exit(void)
 271 {
 272         ssb_driver_unregister(&ssb_hcd_driver);
 273 }
 274 module_exit(ssb_hcd_exit);