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)
95 "%s->Dev[%04x:%04x] has invalid IRQ. Check vendor BIOS\n",
96 __FUNCTION__, dev->device, dev->vendor);
98 if (pcie_port_device_register(dev)) {
99 pci_disable_device(dev);
103 pcie_portdrv_save_config(dev);
105 pci_enable_pcie_error_reporting(dev);
110 static void pcie_portdrv_remove (struct pci_dev *dev)
112 pcie_port_device_remove(dev);
113 kfree(pci_get_drvdata(dev));
116 static int error_detected_iter(struct device *device, void *data)
118 struct pcie_device *pcie_device;
119 struct pcie_port_service_driver *driver;
120 struct aer_broadcast_data *result_data;
121 pci_ers_result_t status;
123 result_data = (struct aer_broadcast_data *) data;
125 if (device->bus == &pcie_port_bus_type && device->driver) {
126 driver = to_service_driver(device->driver);
128 !driver->err_handler ||
129 !driver->err_handler->error_detected)
132 pcie_device = to_pcie_device(device);
134 /* Forward error detected message to service drivers */
135 status = driver->err_handler->error_detected(
138 result_data->result =
139 merge_result(result_data->result, status);
145 static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
146 enum pci_channel_state error)
148 struct aer_broadcast_data result_data =
149 {error, PCI_ERS_RESULT_CAN_RECOVER};
153 retval = device_for_each_child(&dev->dev, &result_data, error_detected_iter);
155 return result_data.result;
158 static int mmio_enabled_iter(struct device *device, void *data)
160 struct pcie_device *pcie_device;
161 struct pcie_port_service_driver *driver;
162 pci_ers_result_t status, *result;
164 result = (pci_ers_result_t *) data;
166 if (device->bus == &pcie_port_bus_type && device->driver) {
167 driver = to_service_driver(device->driver);
169 driver->err_handler &&
170 driver->err_handler->mmio_enabled) {
171 pcie_device = to_pcie_device(device);
173 /* Forward error message to service drivers */
174 status = driver->err_handler->mmio_enabled(
176 *result = merge_result(*result, status);
183 static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev)
185 pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
188 /* get true return value from &status */
189 retval = device_for_each_child(&dev->dev, &status, mmio_enabled_iter);
193 static int slot_reset_iter(struct device *device, void *data)
195 struct pcie_device *pcie_device;
196 struct pcie_port_service_driver *driver;
197 pci_ers_result_t status, *result;
199 result = (pci_ers_result_t *) data;
201 if (device->bus == &pcie_port_bus_type && device->driver) {
202 driver = to_service_driver(device->driver);
204 driver->err_handler &&
205 driver->err_handler->slot_reset) {
206 pcie_device = to_pcie_device(device);
208 /* Forward error message to service drivers */
209 status = driver->err_handler->slot_reset(
211 *result = merge_result(*result, status);
218 static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev)
220 pci_ers_result_t status;
223 /* If fatal, restore cfg space for possible link reset at upstream */
224 if (dev->error_state == pci_channel_io_frozen) {
225 pcie_portdrv_restore_config(dev);
226 pci_enable_pcie_error_reporting(dev);
229 /* get true return value from &status */
230 retval = device_for_each_child(&dev->dev, &status, slot_reset_iter);
235 static int resume_iter(struct device *device, void *data)
237 struct pcie_device *pcie_device;
238 struct pcie_port_service_driver *driver;
240 if (device->bus == &pcie_port_bus_type && device->driver) {
241 driver = to_service_driver(device->driver);
243 driver->err_handler &&
244 driver->err_handler->resume) {
245 pcie_device = to_pcie_device(device);
247 /* Forward error message to service drivers */
248 driver->err_handler->resume(pcie_device->port);
255 static void pcie_portdrv_err_resume(struct pci_dev *dev)
258 /* nothing to do with error value, if it ever happens */
259 retval = device_for_each_child(&dev->dev, NULL, resume_iter);
263 * LINUX Device Driver Model
265 static const struct pci_device_id port_pci_ids[] = { {
266 /* handle any PCI-Express port */
267 PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0),
268 }, { /* end: all zeroes */ }
270 MODULE_DEVICE_TABLE(pci, port_pci_ids);
272 static struct pci_error_handlers pcie_portdrv_err_handler = {
273 .error_detected = pcie_portdrv_error_detected,
274 .mmio_enabled = pcie_portdrv_mmio_enabled,
275 .slot_reset = pcie_portdrv_slot_reset,
276 .resume = pcie_portdrv_err_resume,
279 static struct pci_driver pcie_portdrv = {
280 .name = (char *)device_name,
281 .id_table = &port_pci_ids[0],
283 .probe = pcie_portdrv_probe,
284 .remove = pcie_portdrv_remove,
286 .suspend = pcie_portdrv_suspend,
287 .resume = pcie_portdrv_resume,
289 .err_handler = &pcie_portdrv_err_handler,
292 static int __init pcie_portdrv_init(void)
296 retval = pcie_port_bus_register();
298 printk(KERN_WARNING "PCIE: bus_register error: %d\n", retval);
301 retval = pci_register_driver(&pcie_portdrv);
303 pcie_port_bus_unregister();
308 static void __exit pcie_portdrv_exit(void)
310 pci_unregister_driver(&pcie_portdrv);
311 pcie_port_bus_unregister();
314 module_init(pcie_portdrv_init);
315 module_exit(pcie_portdrv_exit);