initial_commit

1 files changed, 159 insertions, 0 deletions

diff --git a/drivers/pci/hotplug/pciehp_pci.c b/drivers/pci/hotplug/pciehp_pci.c
new file mode 100644
index 00000000..a4031dfe
--- /dev/null
+++ b/drivers/pci/hotplug/pciehp_pci.c
@@ -0,0 +1,159 @@
+/*
+ * PCI Express 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 "pciehp.h"
+
+static int __ref pciehp_add_bridge(struct pci_dev *dev)
+{
+	struct pci_bus *parent = dev->bus;
+	int pass, busnr, start = parent->secondary;
+	int end = parent->subordinate;
+
+	for (busnr = start; busnr <= end; busnr++) {
+		if (!pci_find_bus(pci_domain_nr(parent), busnr))
+			break;
+	}
+	if (busnr-- > end) {
+		err("No bus number available for hot-added bridge %s\n",
+				pci_name(dev));
+		return -1;
+	}
+	for (pass = 0; pass < 2; pass++)
+		busnr = pci_scan_bridge(parent, dev, busnr, pass);
+	if (!dev->subordinate)
+		return -1;
+
+	return 0;
+}
+
+int pciehp_configure_device(struct slot *p_slot)
+{
+	struct pci_dev *dev;
+	struct pci_dev *bridge = p_slot->ctrl->pcie->port;
+	struct pci_bus *parent = bridge->subordinate;
+	int num, fn;
+	struct controller *ctrl = p_slot->ctrl;
+
+	dev = pci_get_slot(parent, PCI_DEVFN(0, 0));
+	if (dev) {
+		ctrl_err(ctrl, "Device %s already exists "
+			 "at %04x:%02x:00, cannot hot-add\n", pci_name(dev),
+			 pci_domain_nr(parent), parent->number);
+		pci_dev_put(dev);
+		return -EINVAL;
+	}
+
+	num = pci_scan_slot(parent, PCI_DEVFN(0, 0));
+	if (num == 0) {
+		ctrl_err(ctrl, "No new device found\n");
+		return -ENODEV;
+	}
+
+	for (fn = 0; fn < 8; fn++) {
+		dev = pci_get_slot(parent, PCI_DEVFN(0, fn));
+		if (!dev)
+			continue;
+		if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
+				(dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
+			pciehp_add_bridge(dev);
+		}
+		pci_dev_put(dev);
+	}
+
+	pci_assign_unassigned_bridge_resources(bridge);
+
+	for (fn = 0; fn < 8; fn++) {
+		dev = pci_get_slot(parent, PCI_DEVFN(0, fn));
+		if (!dev)
+			continue;
+		if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
+			pci_dev_put(dev);
+			continue;
+		}
+		pci_configure_slot(dev);
+		pci_dev_put(dev);
+	}
+
+	pci_bus_add_devices(parent);
+
+	return 0;
+}
+
+int pciehp_unconfigure_device(struct slot *p_slot)
+{
+	int ret, rc = 0;
+	int j;
+	u8 bctl = 0;
+	u8 presence = 0;
+	struct pci_bus *parent = p_slot->ctrl->pcie->port->subordinate;
+	u16 command;
+	struct controller *ctrl = p_slot->ctrl;
+
+	ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:00\n",
+		 __func__, pci_domain_nr(parent), parent->number);
+	ret = pciehp_get_adapter_status(p_slot, &presence);
+	if (ret)
+		presence = 0;
+
+	for (j = 0; j < 8; j++) {
+		struct pci_dev *temp = pci_get_slot(parent, PCI_DEVFN(0, j));
+		if (!temp)
+			continue;
+		if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE && presence) {
+			pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl);
+			if (bctl & PCI_BRIDGE_CTL_VGA) {
+				ctrl_err(ctrl,
+					 "Cannot remove display device %s\n",
+					 pci_name(temp));
+				pci_dev_put(temp);
+				rc = -EINVAL;
+				break;
+			}
+		}
+		pci_remove_bus_device(temp);
+		/*
+		 * Ensure that no new Requests will be generated from
+		 * the device.
+		 */
+		if (presence) {
+			pci_read_config_word(temp, PCI_COMMAND, &command);
+			command &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_SERR);
+			command |= PCI_COMMAND_INTX_DISABLE;
+			pci_write_config_word(temp, PCI_COMMAND, command);
+		}
+		pci_dev_put(temp);
+	}
+
+	return rc;
+}