/* * Standard Hot Plug Controller Driver * * Copyright (C) 1995,2001 Compaq Computer Corporation * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com) * Copyright (C) 2001 IBM Corp. * Copyright (C) 2003-2004 Intel Corporation * * All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or (at * your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or * NON INFRINGEMENT. See the GNU General Public License for more * details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com> * */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/types.h> #include <linux/pci.h> #include "../pci.h" #include "shpchp.h" static void program_fw_provided_values(struct pci_dev *dev) { u16 pci_cmd, pci_bctl; struct pci_dev *cdev; struct hotplug_params hpp = {0x8, 0x40, 0, 0}; /* defaults */ /* Program hpp values for this device */ if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL || (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE && (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI))) return; get_hp_params_from_firmware(dev, &hpp); pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, hpp.cache_line_size); pci_write_config_byte(dev, PCI_LATENCY_TIMER, hpp.latency_timer); pci_read_config_word(dev, PCI_COMMAND, &pci_cmd); if (hpp.enable_serr) pci_cmd |= PCI_COMMAND_SERR; else pci_cmd &= ~PCI_COMMAND_SERR; if (hpp.enable_perr) pci_cmd |= PCI_COMMAND_PARITY; else pci_cmd &= ~PCI_COMMAND_PARITY; pci_write_config_word(dev, PCI_COMMAND, pci_cmd); /* Program bridge control value and child devices */ if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) { pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, hpp.latency_timer); pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl); if (hpp.enable_serr) pci_bctl |= PCI_BRIDGE_CTL_SERR; else pci_bctl &= ~PCI_BRIDGE_CTL_SERR; if (hpp.enable_perr) pci_bctl |= PCI_BRIDGE_CTL_PARITY; else pci_bctl &= ~PCI_BRIDGE_CTL_PARITY; pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl); if (dev->subordinate) { list_for_each_entry(cdev, &dev->subordinate->devices, bus_list) program_fw_provided_values(cdev); } } } int shpchp_configure_device(struct slot *p_slot) { struct pci_dev *dev; struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate; int num, fn; dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, 0)); if (dev) { err("Device %s already exists at %x:%x, cannot hot-add\n", pci_name(dev), p_slot->bus, p_slot->device); pci_dev_put(dev); return -EINVAL; } num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0)); if (num == 0) { err("No new device found\n"); return -ENODEV; } for (fn = 0; fn < 8; fn++) { dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, fn)); if (!dev) continue; if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) { err("Cannot hot-add display device %s\n", pci_name(dev)); pci_dev_put(dev); continue; } if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) || (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) { /* Find an unused bus number for the new bridge */ struct pci_bus *child; unsigned char busnr, start = parent->secondary; unsigned char end = parent->subordinate; for (busnr = start; busnr <= end; busnr++) { if (!pci_find_bus(pci_domain_nr(parent), busnr)) break; } if (busnr >= end) { err("No free bus for hot-added bridge\n"); pci_dev_put(dev); continue; } child = pci_add_new_bus(parent, dev, busnr); if (!child) { err("Cannot add new bus for %s\n", pci_name(dev)); pci_dev_put(dev); continue; } child->subordinate = pci_do_scan_bus(child); pci_bus_size_bridges(child); } program_fw_provided_values(dev); pci_dev_put(dev); } pci_bus_assign_resources(parent); pci_bus_add_devices(parent); pci_enable_bridges(parent); return 0; } int shpchp_unconfigure_device(struct slot *p_slot) { int rc = 0; int j; u8 bctl = 0; struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate; dbg("%s: bus/dev = %x/%x\n", __FUNCTION__, p_slot->bus, p_slot->device); for (j=0; j<8 ; j++) { struct pci_dev* temp = pci_get_slot(parent, (p_slot->device << 3) | j); if (!temp) continue; if ((temp->class >> 16) == PCI_BASE_CLASS_DISPLAY) { err("Cannot remove display device %s\n", pci_name(temp)); pci_dev_put(temp); continue; } if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE) { pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl); if (bctl & PCI_BRIDGE_CTL_VGA) { err("Cannot remove display device %s\n", pci_name(temp)); pci_dev_put(temp); continue; } } pci_remove_bus_device(temp); pci_dev_put(temp); } return rc; }