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         pci_write_config_dword(core->bus->host_pci, BCMA_PCI_BAR0_WIN,
  17                                core->addr);
  18         pci_write_config_dword(core->bus->host_pci, BCMA_PCI_BAR0_WIN2,
  19                                core->wrap);
  20         core->bus->mapped_core = core;
  21         bcma_debug(core->bus, "Switched to core: 0x%X\n", core->id.id);
  22 }
  23
  24 /* Provides access to the requested core. Returns base offset that has to be
  25  * used. It makes use of fixed windows when possible. */
  26 static u16 bcma_host_pci_provide_access_to_core(struct bcma_device *core)
  27 {
  28         switch (core->id.id) {
  29         case BCMA_CORE_CHIPCOMMON:
  30                 return 3 * BCMA_CORE_SIZE;
  31         case BCMA_CORE_PCIE:
  32                 return 2 * BCMA_CORE_SIZE;
  33         }
  34
  35         if (core->bus->mapped_core != core)
  36                 bcma_host_pci_switch_core(core);
  37         return 0;
  38 }
  39
  40 static u8 bcma_host_pci_read8(struct bcma_device *core, u16 offset)
  41 {
  42         offset += bcma_host_pci_provide_access_to_core(core);
  43         return ioread8(core->bus->mmio + offset);
  44 }
  45
  46 static u16 bcma_host_pci_read16(struct bcma_device *core, u16 offset)
  47 {
  48         offset += bcma_host_pci_provide_access_to_core(core);
  49         return ioread16(core->bus->mmio + offset);
  50 }
  51
  52 static u32 bcma_host_pci_read32(struct bcma_device *core, u16 offset)
  53 {
  54         offset += bcma_host_pci_provide_access_to_core(core);
  55         return ioread32(core->bus->mmio + offset);
  56 }
  57
  58 static void bcma_host_pci_write8(struct bcma_device *core, u16 offset,
  59                                  u8 value)
  60 {
  61         offset += bcma_host_pci_provide_access_to_core(core);
  62         iowrite8(value, core->bus->mmio + offset);
  63 }
  64
  65 static void bcma_host_pci_write16(struct bcma_device *core, u16 offset,
  66                                  u16 value)
  67 {
  68         offset += bcma_host_pci_provide_access_to_core(core);
  69         iowrite16(value, core->bus->mmio + offset);
  70 }
  71
  72 static void bcma_host_pci_write32(struct bcma_device *core, u16 offset,
  73                                  u32 value)
  74 {
  75         offset += bcma_host_pci_provide_access_to_core(core);
  76         iowrite32(value, core->bus->mmio + offset);
  77 }
  78
  79 #ifdef CONFIG_BCMA_BLOCKIO
  80 static void bcma_host_pci_block_read(struct bcma_device *core, void *buffer,
  81                                      size_t count, u16 offset, u8 reg_width)
  82 {
  83         void __iomem *addr = core->bus->mmio + offset;
  84         if (core->bus->mapped_core != core)
  85                 bcma_host_pci_switch_core(core);
  86         switch (reg_width) {
  87         case sizeof(u8):
  88                 ioread8_rep(addr, buffer, count);
  89                 break;
  90         case sizeof(u16):
  91                 WARN_ON(count & 1);
  92                 ioread16_rep(addr, buffer, count >> 1);
  93                 break;
  94         case sizeof(u32):
  95                 WARN_ON(count & 3);
  96                 ioread32_rep(addr, buffer, count >> 2);
  97                 break;
  98         default:
  99                 WARN_ON(1);
 100         }
 101 }
 102
 103 static void bcma_host_pci_block_write(struct bcma_device *core,
 104                                       const void *buffer, size_t count,
 105                                       u16 offset, u8 reg_width)
 106 {
 107         void __iomem *addr = core->bus->mmio + offset;
 108         if (core->bus->mapped_core != core)
 109                 bcma_host_pci_switch_core(core);
 110         switch (reg_width) {
 111         case sizeof(u8):
 112                 iowrite8_rep(addr, buffer, count);
 113                 break;
 114         case sizeof(u16):
 115                 WARN_ON(count & 1);
 116                 iowrite16_rep(addr, buffer, count >> 1);
 117                 break;
 118         case sizeof(u32):
 119                 WARN_ON(count & 3);
 120                 iowrite32_rep(addr, buffer, count >> 2);
 121                 break;
 122         default:
 123                 WARN_ON(1);
 124         }
 125 }
 126 #endif
 127
 128 static u32 bcma_host_pci_aread32(struct bcma_device *core, u16 offset)
 129 {
 130         if (core->bus->mapped_core != core)
 131                 bcma_host_pci_switch_core(core);
 132         return ioread32(core->bus->mmio + (1 * BCMA_CORE_SIZE) + offset);
 133 }
 134
 135 static void bcma_host_pci_awrite32(struct bcma_device *core, u16 offset,
 136                                   u32 value)
 137 {
 138         if (core->bus->mapped_core != core)
 139                 bcma_host_pci_switch_core(core);
 140         iowrite32(value, core->bus->mmio + (1 * BCMA_CORE_SIZE) + offset);
 141 }
 142
 143 static const struct bcma_host_ops bcma_host_pci_ops = {
 144         .read8          = bcma_host_pci_read8,
 145         .read16         = bcma_host_pci_read16,
 146         .read32         = bcma_host_pci_read32,
 147         .write8         = bcma_host_pci_write8,
 148         .write16        = bcma_host_pci_write16,
 149         .write32        = bcma_host_pci_write32,
 150 #ifdef CONFIG_BCMA_BLOCKIO
 151         .block_read     = bcma_host_pci_block_read,
 152         .block_write    = bcma_host_pci_block_write,
 153 #endif
 154         .aread32        = bcma_host_pci_aread32,
 155         .awrite32       = bcma_host_pci_awrite32,
 156 };
 157
 158 static int bcma_host_pci_probe(struct pci_dev *dev,
 159                                const struct pci_device_id *id)
 160 {
 161         struct bcma_bus *bus;
 162         int err = -ENOMEM;
 163         const char *name;
 164         u32 val;
 165
 166         /* Alloc */
 167         bus = kzalloc(sizeof(*bus), GFP_KERNEL);
 168         if (!bus)
 169                 goto out;
 170
 171         /* Basic PCI configuration */
 172         err = pci_enable_device(dev);
 173         if (err)
 174                 goto err_kfree_bus;
 175
 176         name = dev_name(&dev->dev);
 177         if (dev->driver && dev->driver->name)
 178                 name = dev->driver->name;
 179         err = pci_request_regions(dev, name);
 180         if (err)
 181                 goto err_pci_disable;
 182         pci_set_master(dev);
 183
 184         /* Disable the RETRY_TIMEOUT register (0x41) to keep
 185          * PCI Tx retries from interfering with C3 CPU state */
 186         pci_read_config_dword(dev, 0x40, &val);
 187         if ((val & 0x0000ff00) != 0)
 188                 pci_write_config_dword(dev, 0x40, val & 0xffff00ff);
 189
 190         /* SSB needed additional powering up, do we have any AMBA PCI cards? */
 191         if (!pci_is_pcie(dev)) {
 192                 bcma_err(bus, "PCI card detected, they are not supported.\n");
 193                 err = -ENXIO;
 194                 goto err_pci_release_regions;
 195         }
 196
 197         /* Map MMIO */
 198         err = -ENOMEM;
 199         bus->mmio = pci_iomap(dev, 0, ~0UL);
 200         if (!bus->mmio)
 201                 goto err_pci_release_regions;
 202
 203         /* Host specific */
 204         bus->host_pci = dev;
 205         bus->hosttype = BCMA_HOSTTYPE_PCI;
 206         bus->ops = &bcma_host_pci_ops;
 207
 208         bus->boardinfo.vendor = bus->host_pci->subsystem_vendor;
 209         bus->boardinfo.type = bus->host_pci->subsystem_device;
 210
 211         /* Register */
 212         err = bcma_bus_register(bus);
 213         if (err)
 214                 goto err_pci_unmap_mmio;
 215
 216         pci_set_drvdata(dev, bus);
 217
 218 out:
 219         return err;
 220
 221 err_pci_unmap_mmio:
 222         pci_iounmap(dev, bus->mmio);
 223 err_pci_release_regions:
 224         pci_release_regions(dev);
 225 err_pci_disable:
 226         pci_disable_device(dev);
 227 err_kfree_bus:
 228         kfree(bus);
 229         return err;
 230 }
 231
 232 static void bcma_host_pci_remove(struct pci_dev *dev)
 233 {
 234         struct bcma_bus *bus = pci_get_drvdata(dev);
 235
 236         bcma_bus_unregister(bus);
 237         pci_iounmap(dev, bus->mmio);
 238         pci_release_regions(dev);
 239         pci_disable_device(dev);
 240         kfree(bus);
 241 }
 242
 243 #ifdef CONFIG_PM_SLEEP
 244 static int bcma_host_pci_suspend(struct device *dev)
 245 {
 246         struct pci_dev *pdev = to_pci_dev(dev);
 247         struct bcma_bus *bus = pci_get_drvdata(pdev);
 248
 249         bus->mapped_core = NULL;
 250
 251         return bcma_bus_suspend(bus);
 252 }
 253
 254 static int bcma_host_pci_resume(struct device *dev)
 255 {
 256         struct pci_dev *pdev = to_pci_dev(dev);
 257         struct bcma_bus *bus = pci_get_drvdata(pdev);
 258
 259         return bcma_bus_resume(bus);
 260 }
 261
 262 static SIMPLE_DEV_PM_OPS(bcma_pm_ops, bcma_host_pci_suspend,
 263                          bcma_host_pci_resume);
 264 #define BCMA_PM_OPS     (&bcma_pm_ops)
 265
 266 #else /* CONFIG_PM_SLEEP */
 267
 268 #define BCMA_PM_OPS     NULL
 269
 270 #endif /* CONFIG_PM_SLEEP */
 271
 272 static const struct pci_device_id bcma_pci_bridge_tbl[] = {
 273         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x0576) },
 274         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4313) },
 275         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 43224) },
 276         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4331) },
 277         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4353) },
 278         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4357) },
 279         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4358) },
 280         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4359) },
 281         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4365) },
 282         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4727) },
 283         { 0, },
 284 };
 285 MODULE_DEVICE_TABLE(pci, bcma_pci_bridge_tbl);
 286
 287 static struct pci_driver bcma_pci_bridge_driver = {
 288         .name = "bcma-pci-bridge",
 289         .id_table = bcma_pci_bridge_tbl,
 290         .probe = bcma_host_pci_probe,
 291         .remove = bcma_host_pci_remove,
 292         .driver.pm = BCMA_PM_OPS,
 293 };
 294
 295 int __init bcma_host_pci_init(void)
 296 {
 297         return pci_register_driver(&bcma_pci_bridge_driver);
 298 }
 299
 300 void __exit bcma_host_pci_exit(void)
 301 {
 302         pci_unregister_driver(&bcma_pci_bridge_driver);
 303 }