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 pci_restore_state(dev);
45 retval = pci_enable_device(dev);
53 static int pcie_portdrv_suspend(struct pci_dev *dev, pm_message_t state)
55 int ret = pcie_port_device_suspend(dev, state);
58 ret = pcie_portdrv_save_config(dev);
62 static int pcie_portdrv_resume(struct pci_dev *dev)
64 pcie_portdrv_restore_config(dev);
65 return pcie_port_device_resume(dev);
68 #define pcie_portdrv_suspend NULL
69 #define pcie_portdrv_resume NULL
73 * pcie_portdrv_probe - Probe PCI-Express port devices
74 * @dev: PCI-Express port device being probed
76 * If detected invokes the pcie_port_device_register() method for
80 static int __devinit pcie_portdrv_probe (struct pci_dev *dev,
81 const struct pci_device_id *id )
85 status = pcie_port_device_probe(dev);
89 if (pci_enable_device(dev) < 0)
93 if (!dev->irq && dev->pin) {
94 dev_warn(&dev->dev, "device [%04x:%04x] has invalid IRQ; "
95 "check vendor BIOS\n", dev->vendor, dev->device);
97 if (pcie_port_device_register(dev)) {
98 pci_disable_device(dev);
102 pcie_portdrv_save_config(dev);
104 pci_enable_pcie_error_reporting(dev);
109 static void pcie_portdrv_remove (struct pci_dev *dev)
111 pcie_port_device_remove(dev);
112 kfree(pci_get_drvdata(dev));
115 static int error_detected_iter(struct device *device, void *data)
117 struct pcie_device *pcie_device;
118 struct pcie_port_service_driver *driver;
119 struct aer_broadcast_data *result_data;
120 pci_ers_result_t status;
122 result_data = (struct aer_broadcast_data *) data;
124 if (device->bus == &pcie_port_bus_type && device->driver) {
125 driver = to_service_driver(device->driver);
127 !driver->err_handler ||
128 !driver->err_handler->error_detected)
131 pcie_device = to_pcie_device(device);
133 /* Forward error detected message to service drivers */
134 status = driver->err_handler->error_detected(
137 result_data->result =
138 merge_result(result_data->result, status);
144 static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
145 enum pci_channel_state error)
147 struct aer_broadcast_data result_data =
148 {error, PCI_ERS_RESULT_CAN_RECOVER};
152 retval = device_for_each_child(&dev->dev, &result_data, error_detected_iter);
154 return result_data.result;
157 static int mmio_enabled_iter(struct device *device, void *data)
159 struct pcie_device *pcie_device;
160 struct pcie_port_service_driver *driver;
161 pci_ers_result_t status, *result;
163 result = (pci_ers_result_t *) data;
165 if (device->bus == &pcie_port_bus_type && device->driver) {
166 driver = to_service_driver(device->driver);
168 driver->err_handler &&
169 driver->err_handler->mmio_enabled) {
170 pcie_device = to_pcie_device(device);
172 /* Forward error message to service drivers */
173 status = driver->err_handler->mmio_enabled(
175 *result = merge_result(*result, status);
182 static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev)
184 pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
187 /* get true return value from &status */
188 retval = device_for_each_child(&dev->dev, &status, mmio_enabled_iter);
192 static int slot_reset_iter(struct device *device, void *data)
194 struct pcie_device *pcie_device;
195 struct pcie_port_service_driver *driver;
196 pci_ers_result_t status, *result;
198 result = (pci_ers_result_t *) data;
200 if (device->bus == &pcie_port_bus_type && device->driver) {
201 driver = to_service_driver(device->driver);
203 driver->err_handler &&
204 driver->err_handler->slot_reset) {
205 pcie_device = to_pcie_device(device);
207 /* Forward error message to service drivers */
208 status = driver->err_handler->slot_reset(
210 *result = merge_result(*result, status);
217 static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev)
219 pci_ers_result_t status = PCI_ERS_RESULT_NONE;
222 /* If fatal, restore cfg space for possible link reset at upstream */
223 if (dev->error_state == pci_channel_io_frozen) {
224 pcie_portdrv_restore_config(dev);
225 pci_enable_pcie_error_reporting(dev);
228 /* get true return value from &status */
229 retval = device_for_each_child(&dev->dev, &status, slot_reset_iter);
234 static int resume_iter(struct device *device, void *data)
236 struct pcie_device *pcie_device;
237 struct pcie_port_service_driver *driver;
239 if (device->bus == &pcie_port_bus_type && device->driver) {
240 driver = to_service_driver(device->driver);
242 driver->err_handler &&
243 driver->err_handler->resume) {
244 pcie_device = to_pcie_device(device);
246 /* Forward error message to service drivers */
247 driver->err_handler->resume(pcie_device->port);
254 static void pcie_portdrv_err_resume(struct pci_dev *dev)
257 /* nothing to do with error value, if it ever happens */
258 retval = device_for_each_child(&dev->dev, NULL, resume_iter);
262 * LINUX Device Driver Model
264 static const struct pci_device_id port_pci_ids[] = { {
265 /* handle any PCI-Express port */
266 PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0),
267 }, { /* end: all zeroes */ }
269 MODULE_DEVICE_TABLE(pci, port_pci_ids);
271 static struct pci_error_handlers pcie_portdrv_err_handler = {
272 .error_detected = pcie_portdrv_error_detected,
273 .mmio_enabled = pcie_portdrv_mmio_enabled,
274 .slot_reset = pcie_portdrv_slot_reset,
275 .resume = pcie_portdrv_err_resume,
278 static struct pci_driver pcie_portdriver = {
279 .name = (char *)device_name,
280 .id_table = &port_pci_ids[0],
282 .probe = pcie_portdrv_probe,
283 .remove = pcie_portdrv_remove,
285 .suspend = pcie_portdrv_suspend,
286 .resume = pcie_portdrv_resume,
288 .err_handler = &pcie_portdrv_err_handler,
291 static int __init pcie_portdrv_init(void)
295 retval = pcie_port_bus_register();
297 printk(KERN_WARNING "PCIE: bus_register error: %d\n", retval);
300 retval = pci_register_driver(&pcie_portdriver);
302 pcie_port_bus_unregister();
307 static void __exit pcie_portdrv_exit(void)
309 pci_unregister_driver(&pcie_portdriver);
310 pcie_port_bus_unregister();
313 module_init(pcie_portdrv_init);
314 module_exit(pcie_portdrv_exit);