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/*
* File: portdrv_pci.c
* Purpose: PCI Express Port Bus Driver
*
* Copyright (C) 2004 Intel
* Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
*/
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/pm.h>
#include <linux/init.h>
#include <linux/pcieport_if.h>
#include "portdrv.h"
/*
* Version Information
*/
#define DRIVER_VERSION "v1.0"
#define DRIVER_AUTHOR "tom.l.nguyen@intel.com"
#define DRIVER_DESC "PCIE Port Bus Driver"
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
/* global data */
static const char device_name[] = "pcieport-driver";
static void pci_save_msi_state(struct pci_dev *dev)
{
struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
int i = 0, pos;
u16 control;
if ((pos = pci_find_capability(dev, PCI_CAP_ID_MSI)) <= 0)
return;
pci_read_config_dword(dev, pos, &p_ext->saved_msi_config_space[i++]);
control = p_ext->saved_msi_config_space[0] >> 16;
pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_LO,
&p_ext->saved_msi_config_space[i++]);
if (control & PCI_MSI_FLAGS_64BIT) {
pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_HI,
&p_ext->saved_msi_config_space[i++]);
pci_read_config_dword(dev, pos + PCI_MSI_DATA_64,
&p_ext->saved_msi_config_space[i++]);
} else
pci_read_config_dword(dev, pos + PCI_MSI_DATA_32,
&p_ext->saved_msi_config_space[i++]);
if (control & PCI_MSI_FLAGS_MASKBIT)
pci_read_config_dword(dev, pos + PCI_MSI_MASK_BIT,
&p_ext->saved_msi_config_space[i++]);
}
static void pci_restore_msi_state(struct pci_dev *dev)
{
struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
int i = 0, pos;
u16 control;
if ((pos = pci_find_capability(dev, PCI_CAP_ID_MSI)) <= 0)
return;
control = p_ext->saved_msi_config_space[i++] >> 16;
pci_write_config_word(dev, pos + PCI_MSI_FLAGS, control);
pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_LO,
p_ext->saved_msi_config_space[i++]);
if (control & PCI_MSI_FLAGS_64BIT) {
pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_HI,
p_ext->saved_msi_config_space[i++]);
pci_write_config_dword(dev, pos + PCI_MSI_DATA_64,
p_ext->saved_msi_config_space[i++]);
} else
pci_write_config_dword(dev, pos + PCI_MSI_DATA_32,
p_ext->saved_msi_config_space[i++]);
if (control & PCI_MSI_FLAGS_MASKBIT)
pci_write_config_dword(dev, pos + PCI_MSI_MASK_BIT,
p_ext->saved_msi_config_space[i++]);
}
static void pcie_portdrv_save_config(struct pci_dev *dev)
{
struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
pci_save_state(dev);
if (p_ext->interrupt_mode == PCIE_PORT_MSI_MODE)
pci_save_msi_state(dev);
}
static int pcie_portdrv_restore_config(struct pci_dev *dev)
{
struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
int retval;
pci_restore_state(dev);
if (p_ext->interrupt_mode == PCIE_PORT_MSI_MODE)
pci_restore_msi_state(dev);
retval = pci_enable_device(dev);
if (retval)
return retval;
pci_set_master(dev);
return 0;
}
/*
* pcie_portdrv_probe - Probe PCI-Express port devices
* @dev: PCI-Express port device being probed
*
* If detected invokes the pcie_port_device_register() method for
* this port device.
*
*/
static int __devinit pcie_portdrv_probe (struct pci_dev *dev,
const struct pci_device_id *id )
{
int status;
status = pcie_port_device_probe(dev);
if (status)
return status;
if (pci_enable_device(dev) < 0)
return -ENODEV;
pci_set_master(dev);
if (!dev->irq) {
printk(KERN_WARNING
"%s->Dev[%04x:%04x] has invalid IRQ. Check vendor BIOS\n",
__FUNCTION__, dev->device, dev->vendor);
}
if (pcie_port_device_register(dev))
return -ENOMEM;
return 0;
}
static void pcie_portdrv_remove (struct pci_dev *dev)
{
pcie_port_device_remove(dev);
kfree(pci_get_drvdata(dev));
}
#ifdef CONFIG_PM
static int pcie_portdrv_suspend (struct pci_dev *dev, pm_message_t state)
{
int ret = pcie_port_device_suspend(dev, state);
pcie_portdrv_save_config(dev);
return ret;
}
static int pcie_portdrv_resume (struct pci_dev *dev)
{
pcie_portdrv_restore_config(dev);
return pcie_port_device_resume(dev);
}
#endif
/*
* LINUX Device Driver Model
*/
static const struct pci_device_id port_pci_ids[] = { {
/* handle any PCI-Express port */
PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0),
}, { /* end: all zeroes */ }
};
MODULE_DEVICE_TABLE(pci, port_pci_ids);
static struct pci_driver pcie_portdrv = {
.name = (char *)device_name,
.id_table = &port_pci_ids[0],
.probe = pcie_portdrv_probe,
.remove = pcie_portdrv_remove,
#ifdef CONFIG_PM
.suspend = pcie_portdrv_suspend,
.resume = pcie_portdrv_resume,
#endif /* PM */
};
static int __init pcie_portdrv_init(void)
{
int retval = 0;
pcie_port_bus_register();
retval = pci_register_driver(&pcie_portdrv);
if (retval)
pcie_port_bus_unregister();
return retval;
}
static void __exit pcie_portdrv_exit(void)
{
pci_unregister_driver(&pcie_portdrv);
pcie_port_bus_unregister();
}
module_init(pcie_portdrv_init);
module_exit(pcie_portdrv_exit);
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