- 根目录:
- drivers
- bcma
- host_pci.c
/*
* Broadcom specific AMBA
* PCI Host
*
* Licensed under the GNU/GPL. See COPYING for details.
*/
#include "bcma_private.h"
#include <linux/slab.h>
#include <linux/bcma/bcma.h>
#include <linux/pci.h>
#include <linux/module.h>
static void bcma_host_pci_switch_core(struct bcma_device *core)
{
int win2 = core->bus->host_is_pcie2 ?
BCMA_PCIE2_BAR0_WIN2 : BCMA_PCI_BAR0_WIN2;
pci_write_config_dword(core->bus->host_pci, BCMA_PCI_BAR0_WIN,
core->addr);
pci_write_config_dword(core->bus->host_pci, win2, core->wrap);
core->bus->mapped_core = core;
bcma_debug(core->bus, "Switched to core: 0x%X\n", core->id.id);
}
/* Provides access to the requested core. Returns base offset that has to be
* used. It makes use of fixed windows when possible. */
static u16 bcma_host_pci_provide_access_to_core(struct bcma_device *core)
{
switch (core->id.id) {
case BCMA_CORE_CHIPCOMMON:
return 3 * BCMA_CORE_SIZE;
case BCMA_CORE_PCIE:
return 2 * BCMA_CORE_SIZE;
}
if (core->bus->mapped_core != core)
bcma_host_pci_switch_core(core);
return 0;
}
static u8 bcma_host_pci_read8(struct bcma_device *core, u16 offset)
{
offset += bcma_host_pci_provide_access_to_core(core);
return ioread8(core->bus->mmio + offset);
}
static u16 bcma_host_pci_read16(struct bcma_device *core, u16 offset)
{
offset += bcma_host_pci_provide_access_to_core(core);
return ioread16(core->bus->mmio + offset);
}
static u32 bcma_host_pci_read32(struct bcma_device *core, u16 offset)
{
offset += bcma_host_pci_provide_access_to_core(core);
return ioread32(core->bus->mmio + offset);
}
static void bcma_host_pci_write8(struct bcma_device *core, u16 offset,
u8 value)
{
offset += bcma_host_pci_provide_access_to_core(core);
iowrite8(value, core->bus->mmio + offset);
}
static void bcma_host_pci_write16(struct bcma_device *core, u16 offset,
u16 value)
{
offset += bcma_host_pci_provide_access_to_core(core);
iowrite16(value, core->bus->mmio + offset);
}
static void bcma_host_pci_write32(struct bcma_device *core, u16 offset,
u32 value)
{
offset += bcma_host_pci_provide_access_to_core(core);
iowrite32(value, core->bus->mmio + offset);
}
#ifdef CONFIG_BCMA_BLOCKIO
static void bcma_host_pci_block_read(struct bcma_device *core, void *buffer,
size_t count, u16 offset, u8 reg_width)
{
void __iomem *addr = core->bus->mmio + offset;
if (core->bus->mapped_core != core)
bcma_host_pci_switch_core(core);
switch (reg_width) {
case sizeof(u8):
ioread8_rep(addr, buffer, count);
break;
case sizeof(u16):
WARN_ON(count & 1);
ioread16_rep(addr, buffer, count >> 1);
break;
case sizeof(u32):
WARN_ON(count & 3);
ioread32_rep(addr, buffer, count >> 2);
break;
default:
WARN_ON(1);
}
}
static void bcma_host_pci_block_write(struct bcma_device *core,
const void *buffer, size_t count,
u16 offset, u8 reg_width)
{
void __iomem *addr = core->bus->mmio + offset;
if (core->bus->mapped_core != core)
bcma_host_pci_switch_core(core);
switch (reg_width) {
case sizeof(u8):
iowrite8_rep(addr, buffer, count);
break;
case sizeof(u16):
WARN_ON(count & 1);
iowrite16_rep(addr, buffer, count >> 1);
break;
case sizeof(u32):
WARN_ON(count & 3);
iowrite32_rep(addr, buffer, count >> 2);
break;
default:
WARN_ON(1);
}
}
#endif
static u32 bcma_host_pci_aread32(struct bcma_device *core, u16 offset)
{
if (core->bus->mapped_core != core)
bcma_host_pci_switch_core(core);
return ioread32(core->bus->mmio + (1 * BCMA_CORE_SIZE) + offset);
}
static void bcma_host_pci_awrite32(struct bcma_device *core, u16 offset,
u32 value)
{
if (core->bus->mapped_core != core)
bcma_host_pci_switch_core(core);
iowrite32(value, core->bus->mmio + (1 * BCMA_CORE_SIZE) + offset);
}
static const struct bcma_host_ops bcma_host_pci_ops = {
.read8 = bcma_host_pci_read8,
.read16 = bcma_host_pci_read16,
.read32 = bcma_host_pci_read32,
.write8 = bcma_host_pci_write8,
.write16 = bcma_host_pci_write16,
.write32 = bcma_host_pci_write32,
#ifdef CONFIG_BCMA_BLOCKIO
.block_read = bcma_host_pci_block_read,
.block_write = bcma_host_pci_block_write,
#endif
.aread32 = bcma_host_pci_aread32,
.awrite32 = bcma_host_pci_awrite32,
};
static int bcma_host_pci_probe(struct pci_dev *dev,
const struct pci_device_id *id)
{
struct bcma_bus *bus;
int err = -ENOMEM;
const char *name;
u32 val;
/* Alloc */
bus = kzalloc(sizeof(*bus), GFP_KERNEL);
if (!bus)
goto out;
/* Basic PCI configuration */
err = pci_enable_device(dev);
if (err)
goto err_kfree_bus;
name = dev_name(&dev->dev);
if (dev->driver && dev->driver->name)
name = dev->driver->name;
err = pci_request_regions(dev, name);
if (err)
goto err_pci_disable;
pci_set_master(dev);
/* Disable the RETRY_TIMEOUT register (0x41) to keep
* PCI Tx retries from interfering with C3 CPU state */
pci_read_config_dword(dev, 0x40, &val);
if ((val & 0x0000ff00) != 0)
pci_write_config_dword(dev, 0x40, val & 0xffff00ff);
/* SSB needed additional powering up, do we have any AMBA PCI cards? */
if (!pci_is_pcie(dev)) {
bcma_err(bus, "PCI card detected, they are not supported.\n");
err = -ENXIO;
goto err_pci_release_regions;
}
/* Map MMIO */
err = -ENOMEM;
bus->mmio = pci_iomap(dev, 0, ~0UL);
if (!bus->mmio)
goto err_pci_release_regions;
/* Host specific */
bus->host_pci = dev;
bus->hosttype = BCMA_HOSTTYPE_PCI;
bus->ops = &bcma_host_pci_ops;
bus->boardinfo.vendor = bus->host_pci->subsystem_vendor;
bus->boardinfo.type = bus->host_pci->subsystem_device;
/* Initialize struct, detect chip */
bcma_init_bus(bus);
/* Scan bus to find out generation of PCIe core */
err = bcma_bus_scan(bus);
if (err)
goto err_pci_unmap_mmio;
if (bcma_find_core(bus, BCMA_CORE_PCIE2))
bus->host_is_pcie2 = true;
/* Register */
err = bcma_bus_register(bus);
if (err)
goto err_unregister_cores;
pci_set_drvdata(dev, bus);
out:
return err;
err_unregister_cores:
bcma_unregister_cores(bus);
err_pci_unmap_mmio:
pci_iounmap(dev, bus->mmio);
err_pci_release_regions:
pci_release_regions(dev);
err_pci_disable:
pci_disable_device(dev);
err_kfree_bus:
kfree(bus);
return err;
}
static void bcma_host_pci_remove(struct pci_dev *dev)
{
struct bcma_bus *bus = pci_get_drvdata(dev);
bcma_bus_unregister(bus);
pci_iounmap(dev, bus->mmio);
pci_release_regions(dev);
pci_disable_device(dev);
kfree(bus);
}
#ifdef CONFIG_PM_SLEEP
static int bcma_host_pci_suspend(struct device *dev)
{
struct pci_dev *pdev = to_pci_dev(dev);
struct bcma_bus *bus = pci_get_drvdata(pdev);
bus->mapped_core = NULL;
return bcma_bus_suspend(bus);
}
static int bcma_host_pci_resume(struct device *dev)
{
struct pci_dev *pdev = to_pci_dev(dev);
struct bcma_bus *bus = pci_get_drvdata(pdev);
return bcma_bus_resume(bus);
}
static SIMPLE_DEV_PM_OPS(bcma_pm_ops, bcma_host_pci_suspend,
bcma_host_pci_resume);
#define BCMA_PM_OPS (&bcma_pm_ops)
#else /* CONFIG_PM_SLEEP */
#define BCMA_PM_OPS NULL
#endif /* CONFIG_PM_SLEEP */
static const struct pci_device_id bcma_pci_bridge_tbl[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x0576) },
{ PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4313) },
{ PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 43224) }, /* 0xa8d8 */
{ PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4331) },
{ PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4353) },
{ PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4357) },
{ PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4358) },
{ PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4359) },
{ PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4360) },
{ PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4365) },
{ PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x43a0) },
{ PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x43a9) },
{ PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x43aa) },
{ PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x43b1) },
{ PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4727) },
{ PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 43227) }, /* 0xa8db, BCM43217 (sic!) */
{ PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 43228) }, /* 0xa8dc */
{ 0, },
};
MODULE_DEVICE_TABLE(pci, bcma_pci_bridge_tbl);
static struct pci_driver bcma_pci_bridge_driver = {
.name = "bcma-pci-bridge",
.id_table = bcma_pci_bridge_tbl,
.probe = bcma_host_pci_probe,
.remove = bcma_host_pci_remove,
.driver.pm = BCMA_PM_OPS,
};
int __init bcma_host_pci_init(void)
{
return pci_register_driver(&bcma_pci_bridge_driver);
}
void __exit bcma_host_pci_exit(void)
{
pci_unregister_driver(&bcma_pci_bridge_driver);
}
/**************************************************
* Runtime ops for drivers.
**************************************************/
/* See also pcicore_up */
void bcma_host_pci_up(struct bcma_bus *bus)
{
if (bus->hosttype != BCMA_HOSTTYPE_PCI)
return;
if (bus->host_is_pcie2)
bcma_core_pcie2_up(&bus->drv_pcie2);
else
bcma_core_pci_up(&bus->drv_pci[0]);
}
EXPORT_SYMBOL_GPL(bcma_host_pci_up);
/* See also pcicore_down */
void bcma_host_pci_down(struct bcma_bus *bus)
{
if (bus->hosttype != BCMA_HOSTTYPE_PCI)
return;
if (!bus->host_is_pcie2)
bcma_core_pci_down(&bus->drv_pci[0]);
}
EXPORT_SYMBOL_GPL(bcma_host_pci_down);
/* See also si_pci_setup */
int bcma_host_pci_irq_ctl(struct bcma_bus *bus, struct bcma_device *core,
bool enable)
{
struct pci_dev *pdev;
u32 coremask, tmp;
int err = 0;
if (bus->hosttype != BCMA_HOSTTYPE_PCI) {
/* This bcma device is not on a PCI host-bus. So the IRQs are
* not routed through the PCI core.
* So we must not enable routing through the PCI core. */
goto out;
}
pdev = bus->host_pci;
err = pci_read_config_dword(pdev, BCMA_PCI_IRQMASK, &tmp);
if (err)
goto out;
coremask = BIT(core->core_index) << 8;
if (enable)
tmp |= coremask;
else
tmp &= ~coremask;
err = pci_write_config_dword(pdev, BCMA_PCI_IRQMASK, tmp);
out:
return err;
}
EXPORT_SYMBOL_GPL(bcma_host_pci_irq_ctl);