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
  13 static void bcma_host_pci_switch_core(struct bcma_device *core)
  14 {
  15         pci_write_config_dword(core->bus->host_pci, BCMA_PCI_BAR0_WIN,
  16                                core->addr);
  17         pci_write_config_dword(core->bus->host_pci, BCMA_PCI_BAR0_WIN2,
  18                                core->wrap);
  19         core->bus->mapped_core = core;
  20         pr_debug("Switched to core: 0x%X\n", core->id.id);
  21 }
  22
  23 static u8 bcma_host_pci_read8(struct bcma_device *core, u16 offset)
  24 {
  25         if (core->bus->mapped_core != core)
  26                 bcma_host_pci_switch_core(core);
  27         return ioread8(core->bus->mmio + offset);
  28 }
  29
  30 static u16 bcma_host_pci_read16(struct bcma_device *core, u16 offset)
  31 {
  32         if (core->bus->mapped_core != core)
  33                 bcma_host_pci_switch_core(core);
  34         return ioread16(core->bus->mmio + offset);
  35 }
  36
  37 static u32 bcma_host_pci_read32(struct bcma_device *core, u16 offset)
  38 {
  39         if (core->bus->mapped_core != core)
  40                 bcma_host_pci_switch_core(core);
  41         return ioread32(core->bus->mmio + offset);
  42 }
  43
  44 static void bcma_host_pci_write8(struct bcma_device *core, u16 offset,
  45                                  u8 value)
  46 {
  47         if (core->bus->mapped_core != core)
  48                 bcma_host_pci_switch_core(core);
  49         iowrite8(value, core->bus->mmio + offset);
  50 }
  51
  52 static void bcma_host_pci_write16(struct bcma_device *core, u16 offset,
  53                                  u16 value)
  54 {
  55         if (core->bus->mapped_core != core)
  56                 bcma_host_pci_switch_core(core);
  57         iowrite16(value, core->bus->mmio + offset);
  58 }
  59
  60 static void bcma_host_pci_write32(struct bcma_device *core, u16 offset,
  61                                  u32 value)
  62 {
  63         if (core->bus->mapped_core != core)
  64                 bcma_host_pci_switch_core(core);
  65         iowrite32(value, core->bus->mmio + offset);
  66 }
  67
  68 static u32 bcma_host_pci_aread32(struct bcma_device *core, u16 offset)
  69 {
  70         if (core->bus->mapped_core != core)
  71                 bcma_host_pci_switch_core(core);
  72         return ioread32(core->bus->mmio + (1 * BCMA_CORE_SIZE) + offset);
  73 }
  74
  75 static void bcma_host_pci_awrite32(struct bcma_device *core, u16 offset,
  76                                   u32 value)
  77 {
  78         if (core->bus->mapped_core != core)
  79                 bcma_host_pci_switch_core(core);
  80         iowrite32(value, core->bus->mmio + (1 * BCMA_CORE_SIZE) + offset);
  81 }
  82
  83 const struct bcma_host_ops bcma_host_pci_ops = {
  84         .read8          = bcma_host_pci_read8,
  85         .read16         = bcma_host_pci_read16,
  86         .read32         = bcma_host_pci_read32,
  87         .write8         = bcma_host_pci_write8,
  88         .write16        = bcma_host_pci_write16,
  89         .write32        = bcma_host_pci_write32,
  90         .aread32        = bcma_host_pci_aread32,
  91         .awrite32       = bcma_host_pci_awrite32,
  92 };
  93
  94 static int bcma_host_pci_probe(struct pci_dev *dev,
  95                              const struct pci_device_id *id)
  96 {
  97         struct bcma_bus *bus;
  98         int err = -ENOMEM;
  99         const char *name;
 100         u32 val;
 101
 102         /* Alloc */
 103         bus = kzalloc(sizeof(*bus), GFP_KERNEL);
 104         if (!bus)
 105                 goto out;
 106
 107         /* Basic PCI configuration */
 108         err = pci_enable_device(dev);
 109         if (err)
 110                 goto err_kfree_bus;
 111
 112         name = dev_name(&dev->dev);
 113         if (dev->driver && dev->driver->name)
 114                 name = dev->driver->name;
 115         err = pci_request_regions(dev, name);
 116         if (err)
 117                 goto err_pci_disable;
 118         pci_set_master(dev);
 119
 120         /* Disable the RETRY_TIMEOUT register (0x41) to keep
 121          * PCI Tx retries from interfering with C3 CPU state */
 122         pci_read_config_dword(dev, 0x40, &val);
 123         if ((val & 0x0000ff00) != 0)
 124                 pci_write_config_dword(dev, 0x40, val & 0xffff00ff);
 125
 126         /* SSB needed additional powering up, do we have any AMBA PCI cards? */
 127         if (!pci_is_pcie(dev))
 128                 pr_err("PCI card detected, report problems.\n");
 129
 130         /* Map MMIO */
 131         err = -ENOMEM;
 132         bus->mmio = pci_iomap(dev, 0, ~0UL);
 133         if (!bus->mmio)
 134                 goto err_pci_release_regions;
 135
 136         /* Host specific */
 137         bus->host_pci = dev;
 138         bus->hosttype = BCMA_HOSTTYPE_PCI;
 139         bus->ops = &bcma_host_pci_ops;
 140
 141         /* Register */
 142         err = bcma_bus_register(bus);
 143         if (err)
 144                 goto err_pci_unmap_mmio;
 145
 146         pci_set_drvdata(dev, bus);
 147
 148 out:
 149         return err;
 150
 151 err_pci_unmap_mmio:
 152         pci_iounmap(dev, bus->mmio);
 153 err_pci_release_regions:
 154         pci_release_regions(dev);
 155 err_pci_disable:
 156         pci_disable_device(dev);
 157 err_kfree_bus:
 158         kfree(bus);
 159         return err;
 160 }
 161
 162 static void bcma_host_pci_remove(struct pci_dev *dev)
 163 {
 164         struct bcma_bus *bus = pci_get_drvdata(dev);
 165
 166         bcma_bus_unregister(bus);
 167         pci_iounmap(dev, bus->mmio);
 168         pci_release_regions(dev);
 169         pci_disable_device(dev);
 170         kfree(bus);
 171         pci_set_drvdata(dev, NULL);
 172 }
 173
 174 static DEFINE_PCI_DEVICE_TABLE(bcma_pci_bridge_tbl) = {
 175         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x0576) },
 176         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4331) },
 177         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4353) },
 178         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4727) },
 179         { 0, },
 180 };
 181 MODULE_DEVICE_TABLE(pci, bcma_pci_bridge_tbl);
 182
 183 static struct pci_driver bcma_pci_bridge_driver = {
 184         .name = "bcma-pci-bridge",
 185         .id_table = bcma_pci_bridge_tbl,
 186         .probe = bcma_host_pci_probe,
 187         .remove = bcma_host_pci_remove,
 188 };
 189
 190 int __init bcma_host_pci_init(void)
 191 {
 192         return pci_register_driver(&bcma_pci_bridge_driver);
 193 }
 194
 195 void __exit bcma_host_pci_exit(void)
 196 {
 197         pci_unregister_driver(&bcma_pci_bridge_driver);
 198 }