drivers/ssb/driver_gige.c

   1 /*
   2  * Sonics Silicon Backplane
   3  * Broadcom Gigabit Ethernet core driver
   4  *
   5  * Copyright 2008, Broadcom Corporation
   6  * Copyright 2008, Michael Buesch <m@bues.ch>
   7  *
   8  * Licensed under the GNU/GPL. See COPYING for details.
   9  */
  10
  11 #include <linux/ssb/ssb.h>
  12 #include <linux/ssb/ssb_driver_gige.h>
  13 #include <linux/export.h>
  14 #include <linux/pci.h>
  15 #include <linux/pci_regs.h>
  16 #include <linux/slab.h>
  17
  18
  19 /*
  20 MODULE_DESCRIPTION("SSB Broadcom Gigabit Ethernet driver");
  21 MODULE_AUTHOR("Michael Buesch");
  22 MODULE_LICENSE("GPL");
  23 */
  24
  25 static const struct ssb_device_id ssb_gige_tbl[] = {
  26         SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_ETHERNET_GBIT, SSB_ANY_REV),
  27         {},
  28 };
  29 /* MODULE_DEVICE_TABLE(ssb, ssb_gige_tbl); */
  30
  31
  32 static inline u8 gige_read8(struct ssb_gige *dev, u16 offset)
  33 {
  34         return ssb_read8(dev->dev, offset);
  35 }
  36
  37 static inline u16 gige_read16(struct ssb_gige *dev, u16 offset)
  38 {
  39         return ssb_read16(dev->dev, offset);
  40 }
  41
  42 static inline u32 gige_read32(struct ssb_gige *dev, u16 offset)
  43 {
  44         return ssb_read32(dev->dev, offset);
  45 }
  46
  47 static inline void gige_write8(struct ssb_gige *dev,
  48                                u16 offset, u8 value)
  49 {
  50         ssb_write8(dev->dev, offset, value);
  51 }
  52
  53 static inline void gige_write16(struct ssb_gige *dev,
  54                                 u16 offset, u16 value)
  55 {
  56         ssb_write16(dev->dev, offset, value);
  57 }
  58
  59 static inline void gige_write32(struct ssb_gige *dev,
  60                                 u16 offset, u32 value)
  61 {
  62         ssb_write32(dev->dev, offset, value);
  63 }
  64
  65 static inline
  66 u8 gige_pcicfg_read8(struct ssb_gige *dev, unsigned int offset)
  67 {
  68         BUG_ON(offset >= 256);
  69         return gige_read8(dev, SSB_GIGE_PCICFG + offset);
  70 }
  71
  72 static inline
  73 u16 gige_pcicfg_read16(struct ssb_gige *dev, unsigned int offset)
  74 {
  75         BUG_ON(offset >= 256);
  76         return gige_read16(dev, SSB_GIGE_PCICFG + offset);
  77 }
  78
  79 static inline
  80 u32 gige_pcicfg_read32(struct ssb_gige *dev, unsigned int offset)
  81 {
  82         BUG_ON(offset >= 256);
  83         return gige_read32(dev, SSB_GIGE_PCICFG + offset);
  84 }
  85
  86 static inline
  87 void gige_pcicfg_write8(struct ssb_gige *dev,
  88                         unsigned int offset, u8 value)
  89 {
  90         BUG_ON(offset >= 256);
  91         gige_write8(dev, SSB_GIGE_PCICFG + offset, value);
  92 }
  93
  94 static inline
  95 void gige_pcicfg_write16(struct ssb_gige *dev,
  96                          unsigned int offset, u16 value)
  97 {
  98         BUG_ON(offset >= 256);
  99         gige_write16(dev, SSB_GIGE_PCICFG + offset, value);
 100 }
 101
 102 static inline
 103 void gige_pcicfg_write32(struct ssb_gige *dev,
 104                          unsigned int offset, u32 value)
 105 {
 106         BUG_ON(offset >= 256);
 107         gige_write32(dev, SSB_GIGE_PCICFG + offset, value);
 108 }
 109
 110 static int ssb_gige_pci_read_config(struct pci_bus *bus, unsigned int devfn,
 111                                     int reg, int size, u32 *val)
 112 {
 113         struct ssb_gige *dev = container_of(bus->ops, struct ssb_gige, pci_ops);
 114         unsigned long flags;
 115
 116         if ((PCI_SLOT(devfn) > 0) || (PCI_FUNC(devfn) > 0))
 117                 return PCIBIOS_DEVICE_NOT_FOUND;
 118         if (reg >= 256)
 119                 return PCIBIOS_DEVICE_NOT_FOUND;
 120
 121         spin_lock_irqsave(&dev->lock, flags);
 122         switch (size) {
 123         case 1:
 124                 *val = gige_pcicfg_read8(dev, reg);
 125                 break;
 126         case 2:
 127                 *val = gige_pcicfg_read16(dev, reg);
 128                 break;
 129         case 4:
 130                 *val = gige_pcicfg_read32(dev, reg);
 131                 break;
 132         default:
 133                 WARN_ON(1);
 134         }
 135         spin_unlock_irqrestore(&dev->lock, flags);
 136
 137         return PCIBIOS_SUCCESSFUL;
 138 }
 139
 140 static int ssb_gige_pci_write_config(struct pci_bus *bus, unsigned int devfn,
 141                                      int reg, int size, u32 val)
 142 {
 143         struct ssb_gige *dev = container_of(bus->ops, struct ssb_gige, pci_ops);
 144         unsigned long flags;
 145
 146         if ((PCI_SLOT(devfn) > 0) || (PCI_FUNC(devfn) > 0))
 147                 return PCIBIOS_DEVICE_NOT_FOUND;
 148         if (reg >= 256)
 149                 return PCIBIOS_DEVICE_NOT_FOUND;
 150
 151         spin_lock_irqsave(&dev->lock, flags);
 152         switch (size) {
 153         case 1:
 154                 gige_pcicfg_write8(dev, reg, val);
 155                 break;
 156         case 2:
 157                 gige_pcicfg_write16(dev, reg, val);
 158                 break;
 159         case 4:
 160                 gige_pcicfg_write32(dev, reg, val);
 161                 break;
 162         default:
 163                 WARN_ON(1);
 164         }
 165         spin_unlock_irqrestore(&dev->lock, flags);
 166
 167         return PCIBIOS_SUCCESSFUL;
 168 }
 169
 170 static int ssb_gige_probe(struct ssb_device *sdev,
 171                           const struct ssb_device_id *id)
 172 {
 173         struct ssb_gige *dev;
 174         u32 base, tmslow, tmshigh;
 175
 176         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 177         if (!dev)
 178                 return -ENOMEM;
 179         dev->dev = sdev;
 180
 181         spin_lock_init(&dev->lock);
 182         dev->pci_controller.pci_ops = &dev->pci_ops;
 183         dev->pci_controller.io_resource = &dev->io_resource;
 184         dev->pci_controller.mem_resource = &dev->mem_resource;
 185         dev->pci_controller.io_map_base = 0x800;
 186         dev->pci_ops.read = ssb_gige_pci_read_config;
 187         dev->pci_ops.write = ssb_gige_pci_write_config;
 188
 189         dev->io_resource.name = SSB_GIGE_IO_RES_NAME;
 190         dev->io_resource.start = 0x800;
 191         dev->io_resource.end = 0x8FF;
 192         dev->io_resource.flags = IORESOURCE_IO | IORESOURCE_PCI_FIXED;
 193
 194         if (!ssb_device_is_enabled(sdev))
 195                 ssb_device_enable(sdev, 0);
 196
 197         /* Setup BAR0. This is a 64k MMIO region. */
 198         base = ssb_admatch_base(ssb_read32(sdev, SSB_ADMATCH1));
 199         gige_pcicfg_write32(dev, PCI_BASE_ADDRESS_0, base);
 200         gige_pcicfg_write32(dev, PCI_BASE_ADDRESS_1, 0);
 201
 202         dev->mem_resource.name = SSB_GIGE_MEM_RES_NAME;
 203         dev->mem_resource.start = base;
 204         dev->mem_resource.end = base + 0x10000 - 1;
 205         dev->mem_resource.flags = IORESOURCE_MEM | IORESOURCE_PCI_FIXED;
 206
 207         /* Enable the memory region. */
 208         gige_pcicfg_write16(dev, PCI_COMMAND,
 209                             gige_pcicfg_read16(dev, PCI_COMMAND)
 210                             | PCI_COMMAND_MEMORY);
 211
 212         /* Write flushing is controlled by the Flush Status Control register.
 213          * We want to flush every register write with a timeout and we want
 214          * to disable the IRQ mask while flushing to avoid concurrency.
 215          * Note that automatic write flushing does _not_ work from
 216          * an IRQ handler. The driver must flush manually by reading a register.
 217          */
 218         gige_write32(dev, SSB_GIGE_SHIM_FLUSHSTAT, 0x00000068);
 219
 220         /* Check if we have an RGMII or GMII PHY-bus.
 221          * On RGMII do not bypass the DLLs */
 222         tmslow = ssb_read32(sdev, SSB_TMSLOW);
 223         tmshigh = ssb_read32(sdev, SSB_TMSHIGH);
 224         if (tmshigh & SSB_GIGE_TMSHIGH_RGMII) {
 225                 tmslow &= ~SSB_GIGE_TMSLOW_TXBYPASS;
 226                 tmslow &= ~SSB_GIGE_TMSLOW_RXBYPASS;
 227                 dev->has_rgmii = 1;
 228         } else {
 229                 tmslow |= SSB_GIGE_TMSLOW_TXBYPASS;
 230                 tmslow |= SSB_GIGE_TMSLOW_RXBYPASS;
 231                 dev->has_rgmii = 0;
 232         }
 233         tmslow |= SSB_GIGE_TMSLOW_DLLEN;
 234         ssb_write32(sdev, SSB_TMSLOW, tmslow);
 235
 236         ssb_set_drvdata(sdev, dev);
 237         register_pci_controller(&dev->pci_controller);
 238
 239         return 0;
 240 }
 241
 242 bool pdev_is_ssb_gige_core(struct pci_dev *pdev)
 243 {
 244         if (!pdev->resource[0].name)
 245                 return 0;
 246         return (strcmp(pdev->resource[0].name, SSB_GIGE_MEM_RES_NAME) == 0);
 247 }
 248 EXPORT_SYMBOL(pdev_is_ssb_gige_core);
 249
 250 int ssb_gige_pcibios_plat_dev_init(struct ssb_device *sdev,
 251                                    struct pci_dev *pdev)
 252 {
 253         struct ssb_gige *dev = ssb_get_drvdata(sdev);
 254         struct resource *res;
 255
 256         if (pdev->bus->ops != &dev->pci_ops) {
 257                 /* The PCI device is not on this SSB GigE bridge device. */
 258                 return -ENODEV;
 259         }
 260
 261         /* Fixup the PCI resources. */
 262         res = &(pdev->resource[0]);
 263         res->flags = IORESOURCE_MEM | IORESOURCE_PCI_FIXED;
 264         res->name = dev->mem_resource.name;
 265         res->start = dev->mem_resource.start;
 266         res->end = dev->mem_resource.end;
 267
 268         /* Fixup interrupt lines. */
 269         pdev->irq = ssb_mips_irq(sdev) + 2;
 270         pci_write_config_byte(pdev, PCI_INTERRUPT_LINE, pdev->irq);
 271
 272         return 0;
 273 }
 274
 275 int ssb_gige_map_irq(struct ssb_device *sdev,
 276                      const struct pci_dev *pdev)
 277 {
 278         struct ssb_gige *dev = ssb_get_drvdata(sdev);
 279
 280         if (pdev->bus->ops != &dev->pci_ops) {
 281                 /* The PCI device is not on this SSB GigE bridge device. */
 282                 return -ENODEV;
 283         }
 284
 285         return ssb_mips_irq(sdev) + 2;
 286 }
 287
 288 static struct ssb_driver ssb_gige_driver = {
 289         .name           = "BCM-GigE",
 290         .id_table       = ssb_gige_tbl,
 291         .probe          = ssb_gige_probe,
 292 };
 293
 294 int ssb_gige_init(void)
 295 {
 296         return ssb_driver_register(&ssb_gige_driver);
 297 }