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         pr_debug("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 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 void bcma_host_pci_block_write(struct bcma_device *core, const void *buffer,
 104                                size_t count, u16 offset, u8 reg_width)
 105 {
 106         void __iomem *addr = core->bus->mmio + offset;
 107         if (core->bus->mapped_core != core)
 108                 bcma_host_pci_switch_core(core);
 109         switch (reg_width) {
 110         case sizeof(u8):
 111                 iowrite8_rep(addr, buffer, count);
 112                 break;
 113         case sizeof(u16):
 114                 WARN_ON(count & 1);
 115                 iowrite16_rep(addr, buffer, count >> 1);
 116                 break;
 117         case sizeof(u32):
 118                 WARN_ON(count & 3);
 119                 iowrite32_rep(addr, buffer, count >> 2);
 120                 break;
 121         default:
 122                 WARN_ON(1);
 123         }
 124 }
 125 #endif
 126
 127 static u32 bcma_host_pci_aread32(struct bcma_device *core, u16 offset)
 128 {
 129         if (core->bus->mapped_core != core)
 130                 bcma_host_pci_switch_core(core);
 131         return ioread32(core->bus->mmio + (1 * BCMA_CORE_SIZE) + offset);
 132 }
 133
 134 static void bcma_host_pci_awrite32(struct bcma_device *core, u16 offset,
 135                                   u32 value)
 136 {
 137         if (core->bus->mapped_core != core)
 138                 bcma_host_pci_switch_core(core);
 139         iowrite32(value, core->bus->mmio + (1 * BCMA_CORE_SIZE) + offset);
 140 }
 141
 142 const struct bcma_host_ops bcma_host_pci_ops = {
 143         .read8          = bcma_host_pci_read8,
 144         .read16         = bcma_host_pci_read16,
 145         .read32         = bcma_host_pci_read32,
 146         .write8         = bcma_host_pci_write8,
 147         .write16        = bcma_host_pci_write16,
 148         .write32        = bcma_host_pci_write32,
 149 #ifdef CONFIG_BCMA_BLOCKIO
 150         .block_read     = bcma_host_pci_block_read,
 151         .block_write    = bcma_host_pci_block_write,
 152 #endif
 153         .aread32        = bcma_host_pci_aread32,
 154         .awrite32       = bcma_host_pci_awrite32,
 155 };
 156
 157 static int bcma_host_pci_probe(struct pci_dev *dev,
 158                              const struct pci_device_id *id)
 159 {
 160         struct bcma_bus *bus;
 161         int err = -ENOMEM;
 162         const char *name;
 163         u32 val;
 164
 165         /* Alloc */
 166         bus = kzalloc(sizeof(*bus), GFP_KERNEL);
 167         if (!bus)
 168                 goto out;
 169
 170         /* Basic PCI configuration */
 171         err = pci_enable_device(dev);
 172         if (err)
 173                 goto err_kfree_bus;
 174
 175         name = dev_name(&dev->dev);
 176         if (dev->driver && dev->driver->name)
 177                 name = dev->driver->name;
 178         err = pci_request_regions(dev, name);
 179         if (err)
 180                 goto err_pci_disable;
 181         pci_set_master(dev);
 182
 183         /* Disable the RETRY_TIMEOUT register (0x41) to keep
 184          * PCI Tx retries from interfering with C3 CPU state */
 185         pci_read_config_dword(dev, 0x40, &val);
 186         if ((val & 0x0000ff00) != 0)
 187                 pci_write_config_dword(dev, 0x40, val & 0xffff00ff);
 188
 189         /* SSB needed additional powering up, do we have any AMBA PCI cards? */
 190         if (!pci_is_pcie(dev))
 191                 pr_err("PCI card detected, report problems.\n");
 192
 193         /* Map MMIO */
 194         err = -ENOMEM;
 195         bus->mmio = pci_iomap(dev, 0, ~0UL);
 196         if (!bus->mmio)
 197                 goto err_pci_release_regions;
 198
 199         /* Host specific */
 200         bus->host_pci = dev;
 201         bus->hosttype = BCMA_HOSTTYPE_PCI;
 202         bus->ops = &bcma_host_pci_ops;
 203
 204         /* Register */
 205         err = bcma_bus_register(bus);
 206         if (err)
 207                 goto err_pci_unmap_mmio;
 208
 209         pci_set_drvdata(dev, bus);
 210
 211 out:
 212         return err;
 213
 214 err_pci_unmap_mmio:
 215         pci_iounmap(dev, bus->mmio);
 216 err_pci_release_regions:
 217         pci_release_regions(dev);
 218 err_pci_disable:
 219         pci_disable_device(dev);
 220 err_kfree_bus:
 221         kfree(bus);
 222         return err;
 223 }
 224
 225 static void bcma_host_pci_remove(struct pci_dev *dev)
 226 {
 227         struct bcma_bus *bus = pci_get_drvdata(dev);
 228
 229         bcma_bus_unregister(bus);
 230         pci_iounmap(dev, bus->mmio);
 231         pci_release_regions(dev);
 232         pci_disable_device(dev);
 233         kfree(bus);
 234         pci_set_drvdata(dev, NULL);
 235 }
 236
 237 #ifdef CONFIG_PM
 238 static int bcma_host_pci_suspend(struct device *dev)
 239 {
 240         struct pci_dev *pdev = to_pci_dev(dev);
 241         struct bcma_bus *bus = pci_get_drvdata(pdev);
 242
 243         bus->mapped_core = NULL;
 244
 245         return bcma_bus_suspend(bus);
 246 }
 247
 248 static int bcma_host_pci_resume(struct device *dev)
 249 {
 250         struct pci_dev *pdev = to_pci_dev(dev);
 251         struct bcma_bus *bus = pci_get_drvdata(pdev);
 252
 253         return bcma_bus_resume(bus);
 254 }
 255
 256 static SIMPLE_DEV_PM_OPS(bcma_pm_ops, bcma_host_pci_suspend,
 257                          bcma_host_pci_resume);
 258 #define BCMA_PM_OPS     (&bcma_pm_ops)
 259
 260 #else /* CONFIG_PM */
 261
 262 #define BCMA_PM_OPS     NULL
 263
 264 #endif /* CONFIG_PM */
 265
 266 static DEFINE_PCI_DEVICE_TABLE(bcma_pci_bridge_tbl) = {
 267         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x0576) },
 268         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4331) },
 269         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4353) },
 270         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4357) },
 271         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4727) },
 272         { 0, },
 273 };
 274 MODULE_DEVICE_TABLE(pci, bcma_pci_bridge_tbl);
 275
 276 static struct pci_driver bcma_pci_bridge_driver = {
 277         .name = "bcma-pci-bridge",
 278         .id_table = bcma_pci_bridge_tbl,
 279         .probe = bcma_host_pci_probe,
 280         .remove = bcma_host_pci_remove,
 281         .driver.pm = BCMA_PM_OPS,
 282 };
 283
 284 int __init bcma_host_pci_init(void)
 285 {
 286         return pci_register_driver(&bcma_pci_bridge_driver);
 287 }
 288
 289 void __exit bcma_host_pci_exit(void)
 290 {
 291         pci_unregister_driver(&bcma_pci_bridge_driver);
 292 }