2 * PCI Backend - Handle special overlays for broken devices.
4 * Author: Ryan Wilson <hap9@epoch.ncsc.mil>
5 * Author: Chris Bookholt <hap10@epoch.ncsc.mil>
8 #include <linux/kernel.h>
11 #include "conf_space.h"
12 #include "conf_space_quirks.h"
14 LIST_HEAD(pciback_quirks);
16 static inline const struct pci_device_id *
17 match_one_device(const struct pci_device_id *id, const struct pci_dev *dev)
19 if ((id->vendor == PCI_ANY_ID || id->vendor == dev->vendor) &&
20 (id->device == PCI_ANY_ID || id->device == dev->device) &&
21 (id->subvendor == PCI_ANY_ID ||
22 id->subvendor == dev->subsystem_vendor) &&
23 (id->subdevice == PCI_ANY_ID ||
24 id->subdevice == dev->subsystem_device) &&
25 !((id->class ^ dev->class) & id->class_mask))
30 struct pciback_config_quirk *pciback_find_quirk(struct pci_dev *dev)
32 struct pciback_config_quirk *tmp_quirk;
34 list_for_each_entry(tmp_quirk, &pciback_quirks, quirks_list)
35 if (match_one_device(&tmp_quirk->devid, dev) != NULL)
39 "quirk didn't match any device pciback knows about\n");
44 static inline void register_quirk(struct pciback_config_quirk *quirk)
46 list_add_tail(&quirk->quirks_list, &pciback_quirks);
49 int pciback_field_is_dup(struct pci_dev *dev, unsigned int reg)
52 struct pciback_dev_data *dev_data = pci_get_drvdata(dev);
53 struct config_field_entry *cfg_entry;
55 list_for_each_entry(cfg_entry, &dev_data->config_fields, list) {
56 if (OFFSET(cfg_entry) == reg) {
64 int pciback_config_quirks_add_field(struct pci_dev *dev, struct config_field
69 switch (field->size) {
71 field->u.b.read = pciback_read_config_byte;
72 field->u.b.write = pciback_write_config_byte;
75 field->u.w.read = pciback_read_config_word;
76 field->u.w.write = pciback_write_config_word;
79 field->u.dw.read = pciback_read_config_dword;
80 field->u.dw.write = pciback_write_config_dword;
87 pciback_config_add_field(dev, field);
93 int pciback_config_quirks_init(struct pci_dev *dev)
95 struct pciback_config_quirk *quirk;
98 quirk = kzalloc(sizeof(*quirk), GFP_ATOMIC);
104 quirk->devid.vendor = dev->vendor;
105 quirk->devid.device = dev->device;
106 quirk->devid.subvendor = dev->subsystem_vendor;
107 quirk->devid.subdevice = dev->subsystem_device;
108 quirk->devid.class = 0;
109 quirk->devid.class_mask = 0;
110 quirk->devid.driver_data = 0UL;
114 register_quirk(quirk);
119 void pciback_config_field_free(struct config_field *field)
124 int pciback_config_quirk_release(struct pci_dev *dev)
126 struct pciback_config_quirk *quirk;
129 quirk = pciback_find_quirk(dev);
135 list_del(&quirk->quirks_list);