mirror of https://gitee.com/openkylin/linux.git
435 lines
11 KiB
C
435 lines
11 KiB
C
/*
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* File: portdrv_core.c
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* Purpose: PCI Express Port Bus Driver's Core Functions
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*
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* Copyright (C) 2004 Intel
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* Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
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*/
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/pm.h>
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#include <linux/pcieport_if.h>
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#include "portdrv.h"
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extern int pcie_mch_quirk; /* MSI-quirk Indicator */
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static int pcie_port_probe_service(struct device *dev)
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{
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struct pcie_device *pciedev;
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struct pcie_port_service_driver *driver;
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int status = -ENODEV;
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if (!dev || !dev->driver)
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return status;
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driver = to_service_driver(dev->driver);
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if (!driver || !driver->probe)
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return status;
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pciedev = to_pcie_device(dev);
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status = driver->probe(pciedev, driver->id_table);
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if (!status) {
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printk(KERN_DEBUG "Load service driver %s on pcie device %s\n",
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driver->name, dev->bus_id);
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get_device(dev);
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}
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return status;
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}
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static int pcie_port_remove_service(struct device *dev)
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{
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struct pcie_device *pciedev;
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struct pcie_port_service_driver *driver;
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if (!dev || !dev->driver)
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return 0;
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pciedev = to_pcie_device(dev);
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driver = to_service_driver(dev->driver);
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if (driver && driver->remove) {
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printk(KERN_DEBUG "Unload service driver %s on pcie device %s\n",
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driver->name, dev->bus_id);
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driver->remove(pciedev);
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put_device(dev);
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}
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return 0;
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}
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static void pcie_port_shutdown_service(struct device *dev) {}
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static int pcie_port_suspend_service(struct device *dev, pm_message_t state, u32 level)
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{
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struct pcie_device *pciedev;
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struct pcie_port_service_driver *driver;
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if (!dev || !dev->driver)
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return 0;
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pciedev = to_pcie_device(dev);
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driver = to_service_driver(dev->driver);
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if (driver && driver->suspend)
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driver->suspend(pciedev, state);
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return 0;
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}
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static int pcie_port_resume_service(struct device *dev, u32 level)
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{
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struct pcie_device *pciedev;
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struct pcie_port_service_driver *driver;
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if (!dev || !dev->driver)
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return 0;
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pciedev = to_pcie_device(dev);
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driver = to_service_driver(dev->driver);
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if (driver && driver->resume)
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driver->resume(pciedev);
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return 0;
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}
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/*
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* release_pcie_device
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*
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* Being invoked automatically when device is being removed
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* in response to device_unregister(dev) call.
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* Release all resources being claimed.
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*/
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static void release_pcie_device(struct device *dev)
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{
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printk(KERN_DEBUG "Free Port Service[%s]\n", dev->bus_id);
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kfree(to_pcie_device(dev));
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}
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static int is_msi_quirked(struct pci_dev *dev)
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{
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int port_type, quirk = 0;
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u16 reg16;
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pci_read_config_word(dev,
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pci_find_capability(dev, PCI_CAP_ID_EXP) +
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PCIE_CAPABILITIES_REG, ®16);
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port_type = (reg16 >> 4) & PORT_TYPE_MASK;
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switch(port_type) {
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case PCIE_RC_PORT:
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if (pcie_mch_quirk == 1)
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quirk = 1;
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break;
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case PCIE_SW_UPSTREAM_PORT:
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case PCIE_SW_DOWNSTREAM_PORT:
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default:
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break;
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}
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return quirk;
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}
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static int assign_interrupt_mode(struct pci_dev *dev, int *vectors, int mask)
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{
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int i, pos, nvec, status = -EINVAL;
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int interrupt_mode = PCIE_PORT_INTx_MODE;
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/* Set INTx as default */
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for (i = 0, nvec = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
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if (mask & (1 << i))
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nvec++;
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vectors[i] = dev->irq;
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}
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/* Check MSI quirk */
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if (is_msi_quirked(dev))
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return interrupt_mode;
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/* Select MSI-X over MSI if supported */
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pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
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if (pos) {
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struct msix_entry msix_entries[PCIE_PORT_DEVICE_MAXSERVICES] =
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{{0, 0}, {0, 1}, {0, 2}, {0, 3}};
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printk("%s Found MSIX capability\n", __FUNCTION__);
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status = pci_enable_msix(dev, msix_entries, nvec);
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if (!status) {
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int j = 0;
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interrupt_mode = PCIE_PORT_MSIX_MODE;
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for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
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if (mask & (1 << i))
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vectors[i] = msix_entries[j++].vector;
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}
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}
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}
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if (status) {
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pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
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if (pos) {
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printk("%s Found MSI capability\n", __FUNCTION__);
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status = pci_enable_msi(dev);
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if (!status) {
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interrupt_mode = PCIE_PORT_MSI_MODE;
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for (i = 0;i < PCIE_PORT_DEVICE_MAXSERVICES;i++)
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vectors[i] = dev->irq;
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}
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}
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}
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return interrupt_mode;
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}
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static int get_port_device_capability(struct pci_dev *dev)
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{
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int services = 0, pos;
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u16 reg16;
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u32 reg32;
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pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
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pci_read_config_word(dev, pos + PCIE_CAPABILITIES_REG, ®16);
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/* Hot-Plug Capable */
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if (reg16 & PORT_TO_SLOT_MASK) {
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pci_read_config_dword(dev,
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pos + PCIE_SLOT_CAPABILITIES_REG, ®32);
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if (reg32 & SLOT_HP_CAPABLE_MASK)
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services |= PCIE_PORT_SERVICE_HP;
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}
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/* PME Capable */
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pos = pci_find_capability(dev, PCI_CAP_ID_PME);
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if (pos)
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services |= PCIE_PORT_SERVICE_PME;
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pos = PCI_CFG_SPACE_SIZE;
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while (pos) {
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pci_read_config_dword(dev, pos, ®32);
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switch (reg32 & 0xffff) {
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case PCI_EXT_CAP_ID_ERR:
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services |= PCIE_PORT_SERVICE_AER;
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pos = reg32 >> 20;
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break;
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case PCI_EXT_CAP_ID_VC:
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services |= PCIE_PORT_SERVICE_VC;
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pos = reg32 >> 20;
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break;
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default:
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pos = 0;
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break;
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}
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}
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return services;
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}
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static void pcie_device_init(struct pci_dev *parent, struct pcie_device *dev,
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int port_type, int service_type, int irq, int irq_mode)
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{
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struct device *device;
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dev->port = parent;
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dev->interrupt_mode = irq_mode;
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dev->irq = irq;
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dev->id.vendor = parent->vendor;
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dev->id.device = parent->device;
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dev->id.port_type = port_type;
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dev->id.service_type = (1 << service_type);
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/* Initialize generic device interface */
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device = &dev->device;
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memset(device, 0, sizeof(struct device));
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INIT_LIST_HEAD(&device->node);
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INIT_LIST_HEAD(&device->children);
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INIT_LIST_HEAD(&device->bus_list);
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device->bus = &pcie_port_bus_type;
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device->driver = NULL;
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device->driver_data = NULL;
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device->release = release_pcie_device; /* callback to free pcie dev */
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sprintf(&device->bus_id[0], "pcie%02x",
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get_descriptor_id(port_type, service_type));
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device->parent = &parent->dev;
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}
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static struct pcie_device* alloc_pcie_device(struct pci_dev *parent,
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int port_type, int service_type, int irq, int irq_mode)
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{
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struct pcie_device *device;
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device = kmalloc(sizeof(struct pcie_device), GFP_KERNEL);
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if (!device)
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return NULL;
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memset(device, 0, sizeof(struct pcie_device));
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pcie_device_init(parent, device, port_type, service_type, irq,irq_mode);
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printk(KERN_DEBUG "Allocate Port Service[%s]\n", device->device.bus_id);
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return device;
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}
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int pcie_port_device_probe(struct pci_dev *dev)
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{
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int pos, type;
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u16 reg;
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if (!(pos = pci_find_capability(dev, PCI_CAP_ID_EXP)))
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return -ENODEV;
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pci_read_config_word(dev, pos + PCIE_CAPABILITIES_REG, ®);
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type = (reg >> 4) & PORT_TYPE_MASK;
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if ( type == PCIE_RC_PORT || type == PCIE_SW_UPSTREAM_PORT ||
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type == PCIE_SW_DOWNSTREAM_PORT )
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return 0;
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return -ENODEV;
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}
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int pcie_port_device_register(struct pci_dev *dev)
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{
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int status, type, capabilities, irq_mode, i;
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int vectors[PCIE_PORT_DEVICE_MAXSERVICES];
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u16 reg16;
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/* Get port type */
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pci_read_config_word(dev,
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pci_find_capability(dev, PCI_CAP_ID_EXP) +
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PCIE_CAPABILITIES_REG, ®16);
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type = (reg16 >> 4) & PORT_TYPE_MASK;
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/* Now get port services */
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capabilities = get_port_device_capability(dev);
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irq_mode = assign_interrupt_mode(dev, vectors, capabilities);
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/* Allocate child services if any */
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for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
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struct pcie_device *child;
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if (capabilities & (1 << i)) {
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child = alloc_pcie_device(
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dev, /* parent */
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type, /* port type */
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i, /* service type */
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vectors[i], /* irq */
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irq_mode /* interrupt mode */);
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if (child) {
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status = device_register(&child->device);
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if (status) {
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kfree(child);
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continue;
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}
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get_device(&child->device);
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}
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}
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}
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return 0;
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}
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#ifdef CONFIG_PM
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int pcie_port_device_suspend(struct pci_dev *dev, pm_message_t state)
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{
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struct list_head *head, *tmp;
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struct device *parent, *child;
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struct device_driver *driver;
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struct pcie_port_service_driver *service_driver;
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parent = &dev->dev;
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head = &parent->children;
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tmp = head->next;
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while (head != tmp) {
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child = container_of(tmp, struct device, node);
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tmp = tmp->next;
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if (child->bus != &pcie_port_bus_type)
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continue;
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driver = child->driver;
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if (!driver)
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continue;
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service_driver = to_service_driver(driver);
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if (service_driver->suspend)
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service_driver->suspend(to_pcie_device(child), state);
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}
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return 0;
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}
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int pcie_port_device_resume(struct pci_dev *dev)
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{
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struct list_head *head, *tmp;
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struct device *parent, *child;
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struct device_driver *driver;
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struct pcie_port_service_driver *service_driver;
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parent = &dev->dev;
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head = &parent->children;
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tmp = head->next;
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while (head != tmp) {
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child = container_of(tmp, struct device, node);
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tmp = tmp->next;
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if (child->bus != &pcie_port_bus_type)
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continue;
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driver = child->driver;
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if (!driver)
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continue;
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service_driver = to_service_driver(driver);
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if (service_driver->resume)
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service_driver->resume(to_pcie_device(child));
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}
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return 0;
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}
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#endif
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void pcie_port_device_remove(struct pci_dev *dev)
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{
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struct list_head *head, *tmp;
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struct device *parent, *child;
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struct device_driver *driver;
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struct pcie_port_service_driver *service_driver;
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int interrupt_mode = PCIE_PORT_INTx_MODE;
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parent = &dev->dev;
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head = &parent->children;
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tmp = head->next;
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while (head != tmp) {
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child = container_of(tmp, struct device, node);
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tmp = tmp->next;
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if (child->bus != &pcie_port_bus_type)
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continue;
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driver = child->driver;
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if (driver) {
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service_driver = to_service_driver(driver);
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if (service_driver->remove)
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service_driver->remove(to_pcie_device(child));
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}
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interrupt_mode = (to_pcie_device(child))->interrupt_mode;
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put_device(child);
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device_unregister(child);
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}
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/* Switch to INTx by default if MSI enabled */
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if (interrupt_mode == PCIE_PORT_MSIX_MODE)
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pci_disable_msix(dev);
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else if (interrupt_mode == PCIE_PORT_MSI_MODE)
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pci_disable_msi(dev);
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}
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void pcie_port_bus_register(void)
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{
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bus_register(&pcie_port_bus_type);
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}
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void pcie_port_bus_unregister(void)
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{
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bus_unregister(&pcie_port_bus_type);
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}
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int pcie_port_service_register(struct pcie_port_service_driver *new)
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{
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new->driver.name = (char *)new->name;
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new->driver.bus = &pcie_port_bus_type;
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new->driver.probe = pcie_port_probe_service;
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new->driver.remove = pcie_port_remove_service;
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new->driver.shutdown = pcie_port_shutdown_service;
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new->driver.suspend = pcie_port_suspend_service;
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new->driver.resume = pcie_port_resume_service;
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return driver_register(&new->driver);
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}
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void pcie_port_service_unregister(struct pcie_port_service_driver *new)
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{
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driver_unregister(&new->driver);
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}
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EXPORT_SYMBOL(pcie_port_service_register);
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EXPORT_SYMBOL(pcie_port_service_unregister);
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