3 * Purpose: PCI Express Port Bus Driver
5 * Copyright (C) 2004 Intel
6 * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
9 #include <linux/module.h>
10 #include <linux/pci.h>
11 #include <linux/kernel.h>
12 #include <linux/errno.h>
14 #include <linux/init.h>
15 #include <linux/slab.h>
16 #include <linux/pcieport_if.h>
17 #include <linux/aer.h>
20 #include "aer/aerdrv.h"
25 #define DRIVER_VERSION "v1.0"
26 #define DRIVER_AUTHOR "tom.l.nguyen@intel.com"
27 #define DRIVER_DESC "PCIE Port Bus Driver"
28 MODULE_AUTHOR(DRIVER_AUTHOR);
29 MODULE_DESCRIPTION(DRIVER_DESC);
30 MODULE_LICENSE("GPL");
33 static const char device_name[] = "pcieport-driver";
35 static int pcie_portdrv_save_config(struct pci_dev *dev)
37 return pci_save_state(dev);
40 static int pcie_portdrv_restore_config(struct pci_dev *dev)
44 retval = pci_enable_device(dev);
52 static int pcie_portdrv_suspend(struct pci_dev *dev, pm_message_t state)
54 return pcie_port_device_suspend(dev, state);
58 static int pcie_portdrv_resume(struct pci_dev *dev)
61 return pcie_port_device_resume(dev);
64 #define pcie_portdrv_suspend NULL
65 #define pcie_portdrv_resume NULL
69 * pcie_portdrv_probe - Probe PCI-Express port devices
70 * @dev: PCI-Express port device being probed
72 * If detected invokes the pcie_port_device_register() method for
76 static int __devinit pcie_portdrv_probe (struct pci_dev *dev,
77 const struct pci_device_id *id )
81 status = pcie_port_device_probe(dev);
85 if (pci_enable_device(dev) < 0)
89 if (!dev->irq && dev->pin) {
90 dev_warn(&dev->dev, "device [%04x:%04x] has invalid IRQ; "
91 "check vendor BIOS\n", dev->vendor, dev->device);
93 if (pcie_port_device_register(dev)) {
94 pci_disable_device(dev);
98 pcie_portdrv_save_config(dev);
103 static void pcie_portdrv_remove (struct pci_dev *dev)
105 pcie_port_device_remove(dev);
106 kfree(pci_get_drvdata(dev));
109 static int error_detected_iter(struct device *device, void *data)
111 struct pcie_device *pcie_device;
112 struct pcie_port_service_driver *driver;
113 struct aer_broadcast_data *result_data;
114 pci_ers_result_t status;
116 result_data = (struct aer_broadcast_data *) data;
118 if (device->bus == &pcie_port_bus_type && device->driver) {
119 driver = to_service_driver(device->driver);
121 !driver->err_handler ||
122 !driver->err_handler->error_detected)
125 pcie_device = to_pcie_device(device);
127 /* Forward error detected message to service drivers */
128 status = driver->err_handler->error_detected(
131 result_data->result =
132 merge_result(result_data->result, status);
138 static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
139 enum pci_channel_state error)
141 struct aer_broadcast_data result_data =
142 {error, PCI_ERS_RESULT_CAN_RECOVER};
146 retval = device_for_each_child(&dev->dev, &result_data, error_detected_iter);
148 return result_data.result;
151 static int mmio_enabled_iter(struct device *device, void *data)
153 struct pcie_device *pcie_device;
154 struct pcie_port_service_driver *driver;
155 pci_ers_result_t status, *result;
157 result = (pci_ers_result_t *) data;
159 if (device->bus == &pcie_port_bus_type && device->driver) {
160 driver = to_service_driver(device->driver);
162 driver->err_handler &&
163 driver->err_handler->mmio_enabled) {
164 pcie_device = to_pcie_device(device);
166 /* Forward error message to service drivers */
167 status = driver->err_handler->mmio_enabled(
169 *result = merge_result(*result, status);
176 static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev)
178 pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
181 /* get true return value from &status */
182 retval = device_for_each_child(&dev->dev, &status, mmio_enabled_iter);
186 static int slot_reset_iter(struct device *device, void *data)
188 struct pcie_device *pcie_device;
189 struct pcie_port_service_driver *driver;
190 pci_ers_result_t status, *result;
192 result = (pci_ers_result_t *) data;
194 if (device->bus == &pcie_port_bus_type && device->driver) {
195 driver = to_service_driver(device->driver);
197 driver->err_handler &&
198 driver->err_handler->slot_reset) {
199 pcie_device = to_pcie_device(device);
201 /* Forward error message to service drivers */
202 status = driver->err_handler->slot_reset(
204 *result = merge_result(*result, status);
211 static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev)
213 pci_ers_result_t status = PCI_ERS_RESULT_NONE;
216 /* If fatal, restore cfg space for possible link reset at upstream */
217 if (dev->error_state == pci_channel_io_frozen) {
218 pci_restore_state(dev);
219 pcie_portdrv_restore_config(dev);
220 pci_enable_pcie_error_reporting(dev);
223 /* get true return value from &status */
224 retval = device_for_each_child(&dev->dev, &status, slot_reset_iter);
229 static int resume_iter(struct device *device, void *data)
231 struct pcie_device *pcie_device;
232 struct pcie_port_service_driver *driver;
234 if (device->bus == &pcie_port_bus_type && device->driver) {
235 driver = to_service_driver(device->driver);
237 driver->err_handler &&
238 driver->err_handler->resume) {
239 pcie_device = to_pcie_device(device);
241 /* Forward error message to service drivers */
242 driver->err_handler->resume(pcie_device->port);
249 static void pcie_portdrv_err_resume(struct pci_dev *dev)
252 /* nothing to do with error value, if it ever happens */
253 retval = device_for_each_child(&dev->dev, NULL, resume_iter);
257 * LINUX Device Driver Model
259 static const struct pci_device_id port_pci_ids[] = { {
260 /* handle any PCI-Express port */
261 PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0),
262 }, { /* end: all zeroes */ }
264 MODULE_DEVICE_TABLE(pci, port_pci_ids);
266 static struct pci_error_handlers pcie_portdrv_err_handler = {
267 .error_detected = pcie_portdrv_error_detected,
268 .mmio_enabled = pcie_portdrv_mmio_enabled,
269 .slot_reset = pcie_portdrv_slot_reset,
270 .resume = pcie_portdrv_err_resume,
273 static struct pci_driver pcie_portdriver = {
274 .name = (char *)device_name,
275 .id_table = &port_pci_ids[0],
277 .probe = pcie_portdrv_probe,
278 .remove = pcie_portdrv_remove,
280 .suspend = pcie_portdrv_suspend,
281 .resume = pcie_portdrv_resume,
283 .err_handler = &pcie_portdrv_err_handler,
286 static int __init pcie_portdrv_init(void)
290 retval = pcie_port_bus_register();
292 printk(KERN_WARNING "PCIE: bus_register error: %d\n", retval);
295 retval = pci_register_driver(&pcie_portdriver);
297 pcie_port_bus_unregister();
302 static void __exit pcie_portdrv_exit(void)
304 pci_unregister_driver(&pcie_portdriver);
305 pcie_port_bus_unregister();
308 module_init(pcie_portdrv_init);
309 module_exit(pcie_portdrv_exit);