drivers/bcma/host_pci.c

   1 /*
   2  * Broadcom specific AMBA
   3  * PCI Host
   4  *
   5  * Licensed under the GNU/GPL. See COPYING for details.
   6  */
   7
   8 #include "bcma_private.h"
   9 #include <linux/slab.h>
  10 #include <linux/bcma/bcma.h>
  11 #include <linux/pci.h>
  12 #include <linux/module.h>
  13
  14 static void bcma_host_pci_switch_core(struct bcma_device *core)
  15 {
  16         int win2 = core->bus->host_is_pcie2 ?
  17                 BCMA_PCIE2_BAR0_WIN2 : BCMA_PCI_BAR0_WIN2;
  18
  19         pci_write_config_dword(core->bus->host_pci, BCMA_PCI_BAR0_WIN,
  20                                core->addr);
  21         pci_write_config_dword(core->bus->host_pci, win2, core->wrap);
  22         core->bus->mapped_core = core;
  23         bcma_debug(core->bus, "Switched to core: 0x%X\n", core->id.id);
  24 }
  25
  26 /* Provides access to the requested core. Returns base offset that has to be
  27  * used. It makes use of fixed windows when possible. */
  28 static u16 bcma_host_pci_provide_access_to_core(struct bcma_device *core)
  29 {
  30         switch (core->id.id) {
  31         case BCMA_CORE_CHIPCOMMON:
  32                 return 3 * BCMA_CORE_SIZE;
  33         case BCMA_CORE_PCIE:
  34                 return 2 * BCMA_CORE_SIZE;
  35         }
  36
  37         if (core->bus->mapped_core != core)
  38                 bcma_host_pci_switch_core(core);
  39         return 0;
  40 }
  41
  42 static u8 bcma_host_pci_read8(struct bcma_device *core, u16 offset)
  43 {
  44         offset += bcma_host_pci_provide_access_to_core(core);
  45         return ioread8(core->bus->mmio + offset);
  46 }
  47
  48 static u16 bcma_host_pci_read16(struct bcma_device *core, u16 offset)
  49 {
  50         offset += bcma_host_pci_provide_access_to_core(core);
  51         return ioread16(core->bus->mmio + offset);
  52 }
  53
  54 static u32 bcma_host_pci_read32(struct bcma_device *core, u16 offset)
  55 {
  56         offset += bcma_host_pci_provide_access_to_core(core);
  57         return ioread32(core->bus->mmio + offset);
  58 }
  59
  60 static void bcma_host_pci_write8(struct bcma_device *core, u16 offset,
  61                                  u8 value)
  62 {
  63         offset += bcma_host_pci_provide_access_to_core(core);
  64         iowrite8(value, core->bus->mmio + offset);
  65 }
  66
  67 static void bcma_host_pci_write16(struct bcma_device *core, u16 offset,
  68                                  u16 value)
  69 {
  70         offset += bcma_host_pci_provide_access_to_core(core);
  71         iowrite16(value, core->bus->mmio + offset);
  72 }
  73
  74 static void bcma_host_pci_write32(struct bcma_device *core, u16 offset,
  75                                  u32 value)
  76 {
  77         offset += bcma_host_pci_provide_access_to_core(core);
  78         iowrite32(value, core->bus->mmio + offset);
  79 }
  80
  81 #ifdef CONFIG_BCMA_BLOCKIO
  82 static void bcma_host_pci_block_read(struct bcma_device *core, void *buffer,
  83                                      size_t count, u16 offset, u8 reg_width)
  84 {
  85         void __iomem *addr = core->bus->mmio + offset;
  86         if (core->bus->mapped_core != core)
  87                 bcma_host_pci_switch_core(core);
  88         switch (reg_width) {
  89         case sizeof(u8):
  90                 ioread8_rep(addr, buffer, count);
  91                 break;
  92         case sizeof(u16):
  93                 WARN_ON(count & 1);
  94                 ioread16_rep(addr, buffer, count >> 1);
  95                 break;
  96         case sizeof(u32):
  97                 WARN_ON(count & 3);
  98                 ioread32_rep(addr, buffer, count >> 2);
  99                 break;
 100         default:
 101                 WARN_ON(1);
 102         }
 103 }
 104
 105 static void bcma_host_pci_block_write(struct bcma_device *core,
 106                                       const void *buffer, size_t count,
 107                                       u16 offset, u8 reg_width)
 108 {
 109         void __iomem *addr = core->bus->mmio + offset;
 110         if (core->bus->mapped_core != core)
 111                 bcma_host_pci_switch_core(core);
 112         switch (reg_width) {
 113         case sizeof(u8):
 114                 iowrite8_rep(addr, buffer, count);
 115                 break;
 116         case sizeof(u16):
 117                 WARN_ON(count & 1);
 118                 iowrite16_rep(addr, buffer, count >> 1);
 119                 break;
 120         case sizeof(u32):
 121                 WARN_ON(count & 3);
 122                 iowrite32_rep(addr, buffer, count >> 2);
 123                 break;
 124         default:
 125                 WARN_ON(1);
 126         }
 127 }
 128 #endif
 129
 130 static u32 bcma_host_pci_aread32(struct bcma_device *core, u16 offset)
 131 {
 132         if (core->bus->mapped_core != core)
 133                 bcma_host_pci_switch_core(core);
 134         return ioread32(core->bus->mmio + (1 * BCMA_CORE_SIZE) + offset);
 135 }
 136
 137 static void bcma_host_pci_awrite32(struct bcma_device *core, u16 offset,
 138                                   u32 value)
 139 {
 140         if (core->bus->mapped_core != core)
 141                 bcma_host_pci_switch_core(core);
 142         iowrite32(value, core->bus->mmio + (1 * BCMA_CORE_SIZE) + offset);
 143 }
 144
 145 static const struct bcma_host_ops bcma_host_pci_ops = {
 146         .read8          = bcma_host_pci_read8,
 147         .read16         = bcma_host_pci_read16,
 148         .read32         = bcma_host_pci_read32,
 149         .write8         = bcma_host_pci_write8,
 150         .write16        = bcma_host_pci_write16,
 151         .write32        = bcma_host_pci_write32,
 152 #ifdef CONFIG_BCMA_BLOCKIO
 153         .block_read     = bcma_host_pci_block_read,
 154         .block_write    = bcma_host_pci_block_write,
 155 #endif
 156         .aread32        = bcma_host_pci_aread32,
 157         .awrite32       = bcma_host_pci_awrite32,
 158 };
 159
 160 static int bcma_host_pci_probe(struct pci_dev *dev,
 161                                const struct pci_device_id *id)
 162 {
 163         struct bcma_bus *bus;
 164         int err = -ENOMEM;
 165         const char *name;
 166         u32 val;
 167
 168         /* Alloc */
 169         bus = kzalloc(sizeof(*bus), GFP_KERNEL);
 170         if (!bus)
 171                 goto out;
 172
 173         /* Basic PCI configuration */
 174         err = pci_enable_device(dev);
 175         if (err)
 176                 goto err_kfree_bus;
 177
 178         name = dev_name(&dev->dev);
 179         if (dev->driver && dev->driver->name)
 180                 name = dev->driver->name;
 181         err = pci_request_regions(dev, name);
 182         if (err)
 183                 goto err_pci_disable;
 184         pci_set_master(dev);
 185
 186         /* Disable the RETRY_TIMEOUT register (0x41) to keep
 187          * PCI Tx retries from interfering with C3 CPU state */
 188         pci_read_config_dword(dev, 0x40, &val);
 189         if ((val & 0x0000ff00) != 0)
 190                 pci_write_config_dword(dev, 0x40, val & 0xffff00ff);
 191
 192         /* SSB needed additional powering up, do we have any AMBA PCI cards? */
 193         if (!pci_is_pcie(dev)) {
 194                 bcma_err(bus, "PCI card detected, they are not supported.\n");
 195                 err = -ENXIO;
 196                 goto err_pci_release_regions;
 197         }
 198
 199         /* Map MMIO */
 200         err = -ENOMEM;
 201         bus->mmio = pci_iomap(dev, 0, ~0UL);
 202         if (!bus->mmio)
 203                 goto err_pci_release_regions;
 204
 205         /* Host specific */
 206         bus->host_pci = dev;
 207         bus->hosttype = BCMA_HOSTTYPE_PCI;
 208         bus->ops = &bcma_host_pci_ops;
 209
 210         bus->boardinfo.vendor = bus->host_pci->subsystem_vendor;
 211         bus->boardinfo.type = bus->host_pci->subsystem_device;
 212
 213         /* Initialize struct, detect chip */
 214         bcma_init_bus(bus);
 215
 216         /* Scan bus to find out generation of PCIe core */
 217         err = bcma_bus_scan(bus);
 218         if (err)
 219                 goto err_pci_unmap_mmio;
 220
 221         if (bcma_find_core(bus, BCMA_CORE_PCIE2))
 222                 bus->host_is_pcie2 = true;
 223
 224         /* Register */
 225         err = bcma_bus_register(bus);
 226         if (err)
 227                 goto err_unregister_cores;
 228
 229         pci_set_drvdata(dev, bus);
 230
 231 out:
 232         return err;
 233
 234 err_unregister_cores:
 235         bcma_unregister_cores(bus);
 236 err_pci_unmap_mmio:
 237         pci_iounmap(dev, bus->mmio);
 238 err_pci_release_regions:
 239         pci_release_regions(dev);
 240 err_pci_disable:
 241         pci_disable_device(dev);
 242 err_kfree_bus:
 243         kfree(bus);
 244         return err;
 245 }
 246
 247 static void bcma_host_pci_remove(struct pci_dev *dev)
 248 {
 249         struct bcma_bus *bus = pci_get_drvdata(dev);
 250
 251         bcma_bus_unregister(bus);
 252         pci_iounmap(dev, bus->mmio);
 253         pci_release_regions(dev);
 254         pci_disable_device(dev);
 255         kfree(bus);
 256 }
 257
 258 #ifdef CONFIG_PM_SLEEP
 259 static int bcma_host_pci_suspend(struct device *dev)
 260 {
 261         struct pci_dev *pdev = to_pci_dev(dev);
 262         struct bcma_bus *bus = pci_get_drvdata(pdev);
 263
 264         bus->mapped_core = NULL;
 265
 266         return bcma_bus_suspend(bus);
 267 }
 268
 269 static int bcma_host_pci_resume(struct device *dev)
 270 {
 271         struct pci_dev *pdev = to_pci_dev(dev);
 272         struct bcma_bus *bus = pci_get_drvdata(pdev);
 273
 274         return bcma_bus_resume(bus);
 275 }
 276
 277 static SIMPLE_DEV_PM_OPS(bcma_pm_ops, bcma_host_pci_suspend,
 278                          bcma_host_pci_resume);
 279 #define BCMA_PM_OPS     (&bcma_pm_ops)
 280
 281 #else /* CONFIG_PM_SLEEP */
 282
 283 #define BCMA_PM_OPS     NULL
 284
 285 #endif /* CONFIG_PM_SLEEP */
 286
 287 static const struct pci_device_id bcma_pci_bridge_tbl[] = {
 288         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x0576) },
 289         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4313) },
 290         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 43224) },  /* 0xa8d8 */
 291         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4331) },
 292         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4353) },
 293         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4357) },
 294         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4358) },
 295         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4359) },
 296         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4360) },
 297         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4365) },
 298         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x43a0) },
 299         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x43a9) },
 300         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x43aa) },
 301         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x43b1) },
 302         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4727) },
 303         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 43227) },  /* 0xa8db, BCM43217 (sic!) */
 304         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 43228) },  /* 0xa8dc */
 305         { 0, },
 306 };
 307 MODULE_DEVICE_TABLE(pci, bcma_pci_bridge_tbl);
 308
 309 static struct pci_driver bcma_pci_bridge_driver = {
 310         .name = "bcma-pci-bridge",
 311         .id_table = bcma_pci_bridge_tbl,
 312         .probe = bcma_host_pci_probe,
 313         .remove = bcma_host_pci_remove,
 314         .driver.pm = BCMA_PM_OPS,
 315 };
 316
 317 int __init bcma_host_pci_init(void)
 318 {
 319         return pci_register_driver(&bcma_pci_bridge_driver);
 320 }
 321
 322 void __exit bcma_host_pci_exit(void)
 323 {
 324         pci_unregister_driver(&bcma_pci_bridge_driver);
 325 }
 326
 327 /**************************************************
 328  * Runtime ops for drivers.
 329  **************************************************/
 330
 331 /* See also pcicore_up */
 332 void bcma_host_pci_up(struct bcma_bus *bus)
 333 {
 334         if (bus->hosttype != BCMA_HOSTTYPE_PCI)
 335                 return;
 336
 337         if (bus->host_is_pcie2)
 338                 bcma_core_pcie2_up(&bus->drv_pcie2);
 339         else
 340                 bcma_core_pci_up(&bus->drv_pci[0]);
 341 }
 342 EXPORT_SYMBOL_GPL(bcma_host_pci_up);
 343
 344 /* See also pcicore_down */
 345 void bcma_host_pci_down(struct bcma_bus *bus)
 346 {
 347         if (bus->hosttype != BCMA_HOSTTYPE_PCI)
 348                 return;
 349
 350         if (!bus->host_is_pcie2)
 351                 bcma_core_pci_down(&bus->drv_pci[0]);
 352 }
 353 EXPORT_SYMBOL_GPL(bcma_host_pci_down);
 354
 355 /* See also si_pci_setup */
 356 int bcma_host_pci_irq_ctl(struct bcma_bus *bus, struct bcma_device *core,
 357                           bool enable)
 358 {
 359         struct pci_dev *pdev;
 360         u32 coremask, tmp;
 361         int err = 0;
 362
 363         if (bus->hosttype != BCMA_HOSTTYPE_PCI) {
 364                 /* This bcma device is not on a PCI host-bus. So the IRQs are
 365                  * not routed through the PCI core.
 366                  * So we must not enable routing through the PCI core. */
 367                 goto out;
 368         }
 369
 370         pdev = bus->host_pci;
 371
 372         err = pci_read_config_dword(pdev, BCMA_PCI_IRQMASK, &tmp);
 373         if (err)
 374                 goto out;
 375
 376         coremask = BIT(core->core_index) << 8;
 377         if (enable)
 378                 tmp |= coremask;
 379         else
 380                 tmp &= ~coremask;
 381
 382         err = pci_write_config_dword(pdev, BCMA_PCI_IRQMASK, tmp);
 383
 384 out:
 385         return err;
 386 }
 387 EXPORT_SYMBOL_GPL(bcma_host_pci_irq_ctl);