linux/drivers/bcma/host_pci.c
<<
>>
Prefs
   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
  14static 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. */
  26static 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
  40static 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
  46static 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
  52static 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
  58static 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
  65static 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
  72static 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
  80void 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
 103void 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
 127static 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
 134static 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
 142const 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
 157static int __devinit 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                bcma_err(bus, "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        bus->boardinfo.vendor = bus->host_pci->subsystem_vendor;
 205        bus->boardinfo.type = bus->host_pci->subsystem_device;
 206
 207        /* Register */
 208        err = bcma_bus_register(bus);
 209        if (err)
 210                goto err_pci_unmap_mmio;
 211
 212        pci_set_drvdata(dev, bus);
 213
 214out:
 215        return err;
 216
 217err_pci_unmap_mmio:
 218        pci_iounmap(dev, bus->mmio);
 219err_pci_release_regions:
 220        pci_release_regions(dev);
 221err_pci_disable:
 222        pci_disable_device(dev);
 223err_kfree_bus:
 224        kfree(bus);
 225        return err;
 226}
 227
 228static void __devexit bcma_host_pci_remove(struct pci_dev *dev)
 229{
 230        struct bcma_bus *bus = pci_get_drvdata(dev);
 231
 232        bcma_bus_unregister(bus);
 233        pci_iounmap(dev, bus->mmio);
 234        pci_release_regions(dev);
 235        pci_disable_device(dev);
 236        kfree(bus);
 237        pci_set_drvdata(dev, NULL);
 238}
 239
 240#ifdef CONFIG_PM
 241static int bcma_host_pci_suspend(struct device *dev)
 242{
 243        struct pci_dev *pdev = to_pci_dev(dev);
 244        struct bcma_bus *bus = pci_get_drvdata(pdev);
 245
 246        bus->mapped_core = NULL;
 247
 248        return bcma_bus_suspend(bus);
 249}
 250
 251static int bcma_host_pci_resume(struct device *dev)
 252{
 253        struct pci_dev *pdev = to_pci_dev(dev);
 254        struct bcma_bus *bus = pci_get_drvdata(pdev);
 255
 256        return bcma_bus_resume(bus);
 257}
 258
 259static SIMPLE_DEV_PM_OPS(bcma_pm_ops, bcma_host_pci_suspend,
 260                         bcma_host_pci_resume);
 261#define BCMA_PM_OPS     (&bcma_pm_ops)
 262
 263#else /* CONFIG_PM */
 264
 265#define BCMA_PM_OPS     NULL
 266
 267#endif /* CONFIG_PM */
 268
 269static DEFINE_PCI_DEVICE_TABLE(bcma_pci_bridge_tbl) = {
 270        { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x0576) },
 271        { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 43224) },
 272        { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4331) },
 273        { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4353) },
 274        { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4357) },
 275        { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4359) },
 276        { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4727) },
 277        { 0, },
 278};
 279MODULE_DEVICE_TABLE(pci, bcma_pci_bridge_tbl);
 280
 281static struct pci_driver bcma_pci_bridge_driver = {
 282        .name = "bcma-pci-bridge",
 283        .id_table = bcma_pci_bridge_tbl,
 284        .probe = bcma_host_pci_probe,
 285        .remove = __devexit_p(bcma_host_pci_remove),
 286        .driver.pm = BCMA_PM_OPS,
 287};
 288
 289int __init bcma_host_pci_init(void)
 290{
 291        return pci_register_driver(&bcma_pci_bridge_driver);
 292}
 293
 294void __exit bcma_host_pci_exit(void)
 295{
 296        pci_unregister_driver(&bcma_pci_bridge_driver);
 297}
 298
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.