PNP: disable PNP motherboard resources that overlap PCI BARs
[sfrench/cifs-2.6.git] / drivers / pnp / quirks.c
1 /*
2  *  This file contains quirk handling code for PnP devices
3  *  Some devices do not report all their resources, and need to have extra
4  *  resources added. This is most easily accomplished at initialisation time
5  *  when building up the resource structure for the first time.
6  *
7  *  Copyright (c) 2000 Peter Denison <peterd@pnd-pc.demon.co.uk>
8  *
9  *  Heavily based on PCI quirks handling which is
10  *
11  *  Copyright (c) 1999 Martin Mares <mj@ucw.cz>
12  */
13
14 #include <linux/types.h>
15 #include <linux/kernel.h>
16 #include <linux/string.h>
17 #include <linux/slab.h>
18 #include <linux/pnp.h>
19 #include <linux/io.h>
20 #include <linux/kallsyms.h>
21 #include "base.h"
22
23 static void quirk_awe32_resources(struct pnp_dev *dev)
24 {
25         struct pnp_port *port, *port2, *port3;
26         struct pnp_option *res = dev->dependent;
27
28         /*
29          * Unfortunately the isapnp_add_port_resource is too tightly bound
30          * into the PnP discovery sequence, and cannot be used. Link in the
31          * two extra ports (at offset 0x400 and 0x800 from the one given) by
32          * hand.
33          */
34         for (; res; res = res->next) {
35                 port2 = pnp_alloc(sizeof(struct pnp_port));
36                 if (!port2)
37                         return;
38                 port3 = pnp_alloc(sizeof(struct pnp_port));
39                 if (!port3) {
40                         kfree(port2);
41                         return;
42                 }
43                 port = res->port;
44                 memcpy(port2, port, sizeof(struct pnp_port));
45                 memcpy(port3, port, sizeof(struct pnp_port));
46                 port->next = port2;
47                 port2->next = port3;
48                 port2->min += 0x400;
49                 port2->max += 0x400;
50                 port3->min += 0x800;
51                 port3->max += 0x800;
52         }
53         printk(KERN_INFO "pnp: AWE32 quirk - adding two ports\n");
54 }
55
56 static void quirk_cmi8330_resources(struct pnp_dev *dev)
57 {
58         struct pnp_option *res = dev->dependent;
59         unsigned long tmp;
60
61         for (; res; res = res->next) {
62
63                 struct pnp_irq *irq;
64                 struct pnp_dma *dma;
65
66                 for (irq = res->irq; irq; irq = irq->next) {    // Valid irqs are 5, 7, 10
67                         tmp = 0x04A0;
68                         bitmap_copy(irq->map, &tmp, 16);        // 0000 0100 1010 0000
69                 }
70
71                 for (dma = res->dma; dma; dma = dma->next)      // Valid 8bit dma channels are 1,3
72                         if ((dma->flags & IORESOURCE_DMA_TYPE_MASK) ==
73                             IORESOURCE_DMA_8BIT)
74                                 dma->map = 0x000A;
75         }
76         printk(KERN_INFO "pnp: CMI8330 quirk - fixing interrupts and dma\n");
77 }
78
79 static void quirk_sb16audio_resources(struct pnp_dev *dev)
80 {
81         struct pnp_port *port;
82         struct pnp_option *res = dev->dependent;
83         int changed = 0;
84
85         /*
86          * The default range on the mpu port for these devices is 0x388-0x388.
87          * Here we increase that range so that two such cards can be
88          * auto-configured.
89          */
90
91         for (; res; res = res->next) {
92                 port = res->port;
93                 if (!port)
94                         continue;
95                 port = port->next;
96                 if (!port)
97                         continue;
98                 port = port->next;
99                 if (!port)
100                         continue;
101                 if (port->min != port->max)
102                         continue;
103                 port->max += 0x70;
104                 changed = 1;
105         }
106         if (changed)
107                 printk(KERN_INFO
108                        "pnp: SB audio device quirk - increasing port range\n");
109 }
110
111
112 #include <linux/pci.h>
113
114 static void quirk_system_pci_resources(struct pnp_dev *dev)
115 {
116         struct pci_dev *pdev = NULL;
117         resource_size_t pnp_start, pnp_end, pci_start, pci_end;
118         int i, j;
119
120         /*
121          * Some BIOSes have PNP motherboard devices with resources that
122          * partially overlap PCI BARs.  The PNP system driver claims these
123          * motherboard resources, which prevents the normal PCI driver from
124          * requesting them later.
125          *
126          * This patch disables the PNP resources that conflict with PCI BARs
127          * so they won't be claimed by the PNP system driver.
128          */
129         for_each_pci_dev(pdev) {
130                 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
131                         if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM) ||
132                             pci_resource_len(pdev, i) == 0)
133                                 continue;
134
135                         pci_start = pci_resource_start(pdev, i);
136                         pci_end = pci_resource_end(pdev, i);
137                         for (j = 0; j < PNP_MAX_MEM; j++) {
138                                 if (!pnp_mem_valid(dev, j) ||
139                                     pnp_mem_len(dev, j) == 0)
140                                         continue;
141
142                                 pnp_start = pnp_mem_start(dev, j);
143                                 pnp_end = pnp_mem_end(dev, j);
144
145                                 /*
146                                  * If the PNP region doesn't overlap the PCI
147                                  * region at all, there's no problem.
148                                  */
149                                 if (pnp_end < pci_start || pnp_start > pci_end)
150                                         continue;
151
152                                 /*
153                                  * If the PNP region completely encloses (or is
154                                  * at least as large as) the PCI region, that's
155                                  * also OK.  For example, this happens when the
156                                  * PNP device describes a bridge with PCI
157                                  * behind it.
158                                  */
159                                 if (pnp_start <= pci_start &&
160                                     pnp_end >= pci_end)
161                                         continue;
162
163                                 /*
164                                  * Otherwise, the PNP region overlaps *part* of
165                                  * the PCI region, and that might prevent a PCI
166                                  * driver from requesting its resources.
167                                  */
168                                 dev_warn(&dev->dev, "mem resource "
169                                         "(0x%llx-0x%llx) overlaps %s BAR %d "
170                                         "(0x%llx-0x%llx), disabling\n",
171                                         (unsigned long long) pnp_start,
172                                         (unsigned long long) pnp_end,
173                                         pci_name(pdev), i,
174                                         (unsigned long long) pci_start,
175                                         (unsigned long long) pci_end);
176                                 pnp_mem_flags(dev, j) = 0;
177                         }
178                 }
179         }
180 }
181
182 /*
183  *  PnP Quirks
184  *  Cards or devices that need some tweaking due to incomplete resource info
185  */
186
187 static struct pnp_fixup pnp_fixups[] = {
188         /* Soundblaster awe io port quirk */
189         {"CTL0021", quirk_awe32_resources},
190         {"CTL0022", quirk_awe32_resources},
191         {"CTL0023", quirk_awe32_resources},
192         /* CMI 8330 interrupt and dma fix */
193         {"@X@0001", quirk_cmi8330_resources},
194         /* Soundblaster audio device io port range quirk */
195         {"CTL0001", quirk_sb16audio_resources},
196         {"CTL0031", quirk_sb16audio_resources},
197         {"CTL0041", quirk_sb16audio_resources},
198         {"CTL0042", quirk_sb16audio_resources},
199         {"CTL0043", quirk_sb16audio_resources},
200         {"CTL0044", quirk_sb16audio_resources},
201         {"CTL0045", quirk_sb16audio_resources},
202         {"PNP0c01", quirk_system_pci_resources},
203         {"PNP0c02", quirk_system_pci_resources},
204         {""}
205 };
206
207 void pnp_fixup_device(struct pnp_dev *dev)
208 {
209         int i = 0;
210         void (*quirk)(struct pnp_dev *);
211
212         while (*pnp_fixups[i].id) {
213                 if (compare_pnp_id(dev->id, pnp_fixups[i].id)) {
214                         quirk = pnp_fixups[i].quirk_function;
215
216 #ifdef DEBUG
217                         dev_dbg(&dev->dev, "calling quirk 0x%p", quirk);
218                         print_fn_descriptor_symbol(": %s()\n",
219                                 (unsigned long) *quirk);
220 #endif
221                         (*quirk)(dev);
222                 }
223                 i++;
224         }
225 }