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30#include <linux/module.h>
31#include <linux/kernel.h>
32#include <linux/types.h>
33#include <linux/pci.h>
34#include "../pci.h"
35#include "pciehp.h"
36
37int pciehp_configure_device(struct slot *p_slot)
38{
39 struct pci_dev *dev;
40 struct pci_dev *bridge = p_slot->ctrl->pcie->port;
41 struct pci_bus *parent = bridge->subordinate;
42 int num, ret = 0;
43 struct controller *ctrl = p_slot->ctrl;
44
45 pci_lock_rescan_remove();
46
47 dev = pci_get_slot(parent, PCI_DEVFN(0, 0));
48 if (dev) {
49 ctrl_err(ctrl, "Device %s already exists at %04x:%02x:00, cannot hot-add\n",
50 pci_name(dev), pci_domain_nr(parent), parent->number);
51 pci_dev_put(dev);
52 ret = -EEXIST;
53 goto out;
54 }
55
56 num = pci_scan_slot(parent, PCI_DEVFN(0, 0));
57 if (num == 0) {
58 ctrl_err(ctrl, "No new device found\n");
59 ret = -ENODEV;
60 goto out;
61 }
62
63 list_for_each_entry(dev, &parent->devices, bus_list)
64 if (pci_is_bridge(dev))
65 pci_hp_add_bridge(dev);
66
67 pci_assign_unassigned_bridge_resources(bridge);
68 pcie_bus_configure_settings(parent);
69 pci_bus_add_devices(parent);
70
71 out:
72 pci_unlock_rescan_remove();
73 return ret;
74}
75
76int pciehp_unconfigure_device(struct slot *p_slot)
77{
78 int rc = 0;
79 u8 bctl = 0;
80 u8 presence = 0;
81 struct pci_dev *dev, *temp;
82 struct pci_bus *parent = p_slot->ctrl->pcie->port->subordinate;
83 u16 command;
84 struct controller *ctrl = p_slot->ctrl;
85
86 ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:00\n",
87 __func__, pci_domain_nr(parent), parent->number);
88 pciehp_get_adapter_status(p_slot, &presence);
89
90 pci_lock_rescan_remove();
91
92
93
94
95
96
97
98 list_for_each_entry_safe_reverse(dev, temp, &parent->devices,
99 bus_list) {
100 pci_dev_get(dev);
101 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE && presence) {
102 pci_read_config_byte(dev, PCI_BRIDGE_CONTROL, &bctl);
103 if (bctl & PCI_BRIDGE_CTL_VGA) {
104 ctrl_err(ctrl,
105 "Cannot remove display device %s\n",
106 pci_name(dev));
107 pci_dev_put(dev);
108 rc = -EINVAL;
109 break;
110 }
111 }
112 pci_stop_and_remove_bus_device(dev);
113
114
115
116
117 if (presence) {
118 pci_read_config_word(dev, PCI_COMMAND, &command);
119 command &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_SERR);
120 command |= PCI_COMMAND_INTX_DISABLE;
121 pci_write_config_word(dev, PCI_COMMAND, command);
122 }
123 pci_dev_put(dev);
124 }
125
126 pci_unlock_rescan_remove();
127 return rc;
128}
129