[PATCH] pciehp: Fix programming hotplug parameters
[linux-2.6.git] / drivers / pci / hotplug / pciehp_pci.c
1 /*
2  * PCI Express Hot Plug Controller Driver
3  *
4  * Copyright (C) 1995,2001 Compaq Computer Corporation
5  * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
6  * Copyright (C) 2001 IBM Corp.
7  * Copyright (C) 2003-2004 Intel Corporation
8  *
9  * All rights reserved.
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation; either version 2 of the License, or (at
14  * your option) any later version.
15  *
16  * This program is distributed in the hope that it will be useful, but
17  * WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
19  * NON INFRINGEMENT.  See the GNU General Public License for more
20  * details.
21  *
22  * You should have received a copy of the GNU General Public License
23  * along with this program; if not, write to the Free Software
24  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25  *
26  * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
27  *
28  */
29
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
37 static void program_hpp_type0(struct pci_dev *dev, struct hpp_type0 *hpp)
38 {
39         u16 pci_cmd, pci_bctl;
40
41         if (hpp->revision > 1) {
42                 printk(KERN_WARNING "%s: Rev.%d type0 record not supported\n",
43                        __FUNCTION__, hpp->revision);
44                 return;
45         }
46
47         pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, hpp->cache_line_size);
48         pci_write_config_byte(dev, PCI_LATENCY_TIMER, hpp->latency_timer);
49         pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
50         if (hpp->enable_serr)
51                 pci_cmd |= PCI_COMMAND_SERR;
52         else
53                 pci_cmd &= ~PCI_COMMAND_SERR;
54         if (hpp->enable_perr)
55                 pci_cmd |= PCI_COMMAND_PARITY;
56         else
57                 pci_cmd &= ~PCI_COMMAND_PARITY;
58         pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
59
60         /* Program bridge control value */
61         if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
62                 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
63                                       hpp->latency_timer);
64                 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
65                 if (hpp->enable_serr)
66                         pci_bctl |= PCI_BRIDGE_CTL_SERR;
67                 else
68                         pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
69                 if (hpp->enable_perr)
70                         pci_bctl |= PCI_BRIDGE_CTL_PARITY;
71                 else
72                         pci_bctl &= ~PCI_BRIDGE_CTL_PARITY;
73                 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
74         }
75 }
76
77 static void program_hpp_type2(struct pci_dev *dev, struct hpp_type2 *hpp)
78 {
79         int pos;
80         u16 reg16;
81         u32 reg32;
82
83         if (hpp->revision > 1) {
84                 printk(KERN_WARNING "%s: Rev.%d type2 record not supported\n",
85                        __FUNCTION__, hpp->revision);
86                 return;
87         }
88
89         /* Find PCI Express capability */
90         pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
91         if (!pos)
92                 return;
93
94         /* Initialize Device Control Register */
95         pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &reg16);
96         reg16 = (reg16 & hpp->pci_exp_devctl_and) | hpp->pci_exp_devctl_or;
97         pci_write_config_word(dev, pos + PCI_EXP_DEVCTL, reg16);
98
99         /* Initialize Link Control Register */
100         if (dev->subordinate) {
101                 pci_read_config_word(dev, pos + PCI_EXP_LNKCTL, &reg16);
102                 reg16 = (reg16 & hpp->pci_exp_lnkctl_and)
103                         | hpp->pci_exp_lnkctl_or;
104                 pci_write_config_word(dev, pos + PCI_EXP_LNKCTL, reg16);
105         }
106
107         /* Find Advanced Error Reporting Enhanced Capability */
108         pos = 256;
109         do {
110                 pci_read_config_dword(dev, pos, &reg32);
111                 if (PCI_EXT_CAP_ID(reg32) == PCI_EXT_CAP_ID_ERR)
112                         break;
113         } while ((pos = PCI_EXT_CAP_NEXT(reg32)));
114         if (!pos)
115                 return;
116
117         /* Initialize Uncorrectable Error Mask Register */
118         pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, &reg32);
119         reg32 = (reg32 & hpp->unc_err_mask_and) | hpp->unc_err_mask_or;
120         pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, reg32);
121
122         /* Initialize Uncorrectable Error Severity Register */
123         pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, &reg32);
124         reg32 = (reg32 & hpp->unc_err_sever_and) | hpp->unc_err_sever_or;
125         pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, reg32);
126
127         /* Initialize Correctable Error Mask Register */
128         pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, &reg32);
129         reg32 = (reg32 & hpp->cor_err_mask_and) | hpp->cor_err_mask_or;
130         pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, reg32);
131
132         /* Initialize Advanced Error Capabilities and Control Register */
133         pci_read_config_dword(dev, pos + PCI_ERR_CAP, &reg32);
134         reg32 = (reg32 & hpp->adv_err_cap_and) | hpp->adv_err_cap_or;
135         pci_write_config_dword(dev, pos + PCI_ERR_CAP, reg32);
136
137         /*
138          * FIXME: The following two registers are not supported yet.
139          *
140          *   o Secondary Uncorrectable Error Severity Register
141          *   o Secondary Uncorrectable Error Mask Register
142          */
143 }
144
145 static void program_fw_provided_values(struct pci_dev *dev)
146 {
147         struct pci_dev *cdev;
148         struct hotplug_params hpp;
149
150         /* Program hpp values for this device */
151         if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL ||
152                         (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE &&
153                         (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)))
154                 return;
155
156         if (pciehp_get_hp_params_from_firmware(dev, &hpp)) {
157                 printk(KERN_WARNING "%s: Could not get hotplug parameters\n",
158                        __FUNCTION__);
159                 return;
160         }
161
162         if (hpp.t2)
163                 program_hpp_type2(dev, hpp.t2);
164         if (hpp.t0)
165                 program_hpp_type0(dev, hpp.t0);
166
167         /* Program child devices */
168         if (dev->subordinate) {
169                 list_for_each_entry(cdev, &dev->subordinate->devices,
170                                     bus_list)
171                         program_fw_provided_values(cdev);
172         }
173 }
174
175 static int pciehp_add_bridge(struct pci_dev *dev)
176 {
177         struct pci_bus *parent = dev->bus;
178         int pass, busnr, start = parent->secondary;
179         int end = parent->subordinate;
180
181         for (busnr = start; busnr <= end; busnr++) {
182                 if (!pci_find_bus(pci_domain_nr(parent), busnr))
183                         break;
184         }
185         if (busnr-- > end) {
186                 err("No bus number available for hot-added bridge %s\n",
187                                 pci_name(dev));
188                 return -1;
189         }
190         for (pass = 0; pass < 2; pass++)
191                 busnr = pci_scan_bridge(parent, dev, busnr, pass);
192         if (!dev->subordinate)
193                 return -1;
194         pci_bus_size_bridges(dev->subordinate);
195         pci_bus_assign_resources(parent);
196         pci_enable_bridges(parent);
197         pci_bus_add_devices(parent);
198         return 0;
199 }
200
201 int pciehp_configure_device(struct slot *p_slot)
202 {
203         struct pci_dev *dev;
204         struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
205         int num, fn;
206
207         dev = pci_find_slot(p_slot->bus, PCI_DEVFN(p_slot->device, 0));
208         if (dev) {
209                 err("Device %s already exists at %x:%x, cannot hot-add\n",
210                                 pci_name(dev), p_slot->bus, p_slot->device);
211                 return -EINVAL;
212         }
213
214         num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0));
215         if (num == 0) {
216                 err("No new device found\n");
217                 return -ENODEV;
218         }
219
220         for (fn = 0; fn < 8; fn++) {
221                 dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, fn));
222                 if (!dev)
223                         continue;
224                 if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
225                         err("Cannot hot-add display device %s\n",
226                                         pci_name(dev));
227                         continue;
228                 }
229                 if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
230                                 (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
231                         pciehp_add_bridge(dev);
232                 }
233                 program_fw_provided_values(dev);
234         }
235
236         pci_bus_assign_resources(parent);
237         pci_bus_add_devices(parent);
238         return 0;
239 }
240
241 int pciehp_unconfigure_device(struct slot *p_slot)
242 {
243         int rc = 0;
244         int j;
245         u8 bctl = 0;
246
247         dbg("%s: bus/dev = %x/%x\n", __FUNCTION__, p_slot->bus,
248                                 p_slot->device);
249
250         for (j=0; j<8 ; j++) {
251                 struct pci_dev* temp = pci_find_slot(p_slot->bus,
252                                 (p_slot->device << 3) | j);
253                 if (!temp)
254                         continue;
255                 if ((temp->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
256                         err("Cannot remove display device %s\n",
257                                         pci_name(temp));
258                         continue;
259                 }
260                 if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
261                         pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl);
262                         if (bctl & PCI_BRIDGE_CTL_VGA) {
263                                 err("Cannot remove display device %s\n",
264                                                 pci_name(temp));
265                                 continue;
266                         }
267                 }
268                 pci_remove_bus_device(temp);
269         }
270         /* 
271          * Some PCI Express root ports require fixup after hot-plug operation.
272          */
273         if (pcie_mch_quirk) 
274                 pci_fixup_device(pci_fixup_final, p_slot->ctrl->pci_dev);
275         
276         return rc;
277 }
278