Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreq
[linux-2.6] / arch / sparc64 / kernel / pci_common.c
1 /* pci_common.c: PCI controller common support.
2  *
3  * Copyright (C) 1999, 2007 David S. Miller (davem@davemloft.net)
4  */
5
6 #include <linux/string.h>
7 #include <linux/slab.h>
8 #include <linux/init.h>
9 #include <linux/pci.h>
10 #include <linux/device.h>
11
12 #include <asm/pbm.h>
13 #include <asm/prom.h>
14 #include <asm/of_device.h>
15
16 #include "pci_impl.h"
17
18 static void pci_register_legacy_regions(struct resource *io_res,
19                                         struct resource *mem_res)
20 {
21         struct resource *p;
22
23         /* VGA Video RAM. */
24         p = kzalloc(sizeof(*p), GFP_KERNEL);
25         if (!p)
26                 return;
27
28         p->name = "Video RAM area";
29         p->start = mem_res->start + 0xa0000UL;
30         p->end = p->start + 0x1ffffUL;
31         p->flags = IORESOURCE_BUSY;
32         request_resource(mem_res, p);
33
34         p = kzalloc(sizeof(*p), GFP_KERNEL);
35         if (!p)
36                 return;
37
38         p->name = "System ROM";
39         p->start = mem_res->start + 0xf0000UL;
40         p->end = p->start + 0xffffUL;
41         p->flags = IORESOURCE_BUSY;
42         request_resource(mem_res, p);
43
44         p = kzalloc(sizeof(*p), GFP_KERNEL);
45         if (!p)
46                 return;
47
48         p->name = "Video ROM";
49         p->start = mem_res->start + 0xc0000UL;
50         p->end = p->start + 0x7fffUL;
51         p->flags = IORESOURCE_BUSY;
52         request_resource(mem_res, p);
53 }
54
55 static void pci_register_iommu_region(struct pci_pbm_info *pbm)
56 {
57         const u32 *vdma = of_get_property(pbm->prom_node, "virtual-dma", NULL);
58
59         if (vdma) {
60                 struct resource *rp = kmalloc(sizeof(*rp), GFP_KERNEL);
61
62                 if (!rp) {
63                         prom_printf("Cannot allocate IOMMU resource.\n");
64                         prom_halt();
65                 }
66                 rp->name = "IOMMU";
67                 rp->start = pbm->mem_space.start + (unsigned long) vdma[0];
68                 rp->end = rp->start + (unsigned long) vdma[1] - 1UL;
69                 rp->flags = IORESOURCE_BUSY;
70                 request_resource(&pbm->mem_space, rp);
71         }
72 }
73
74 void pci_determine_mem_io_space(struct pci_pbm_info *pbm)
75 {
76         const struct linux_prom_pci_ranges *pbm_ranges;
77         int i, saw_mem, saw_io;
78         int num_pbm_ranges;
79
80         saw_mem = saw_io = 0;
81         pbm_ranges = of_get_property(pbm->prom_node, "ranges", &i);
82         num_pbm_ranges = i / sizeof(*pbm_ranges);
83
84         for (i = 0; i < num_pbm_ranges; i++) {
85                 const struct linux_prom_pci_ranges *pr = &pbm_ranges[i];
86                 unsigned long a;
87                 u32 parent_phys_hi, parent_phys_lo;
88                 int type;
89
90                 parent_phys_hi = pr->parent_phys_hi;
91                 parent_phys_lo = pr->parent_phys_lo;
92                 if (tlb_type == hypervisor)
93                         parent_phys_hi &= 0x0fffffff;
94
95                 type = (pr->child_phys_hi >> 24) & 0x3;
96                 a = (((unsigned long)parent_phys_hi << 32UL) |
97                      ((unsigned long)parent_phys_lo  <<  0UL));
98
99                 switch (type) {
100                 case 0:
101                         /* PCI config space, 16MB */
102                         pbm->config_space = a;
103                         break;
104
105                 case 1:
106                         /* 16-bit IO space, 16MB */
107                         pbm->io_space.start = a;
108                         pbm->io_space.end = a + ((16UL*1024UL*1024UL) - 1UL);
109                         pbm->io_space.flags = IORESOURCE_IO;
110                         saw_io = 1;
111                         break;
112
113                 case 2:
114                         /* 32-bit MEM space, 2GB */
115                         pbm->mem_space.start = a;
116                         pbm->mem_space.end = a + (0x80000000UL - 1UL);
117                         pbm->mem_space.flags = IORESOURCE_MEM;
118                         saw_mem = 1;
119                         break;
120
121                 case 3:
122                         /* XXX 64-bit MEM handling XXX */
123
124                 default:
125                         break;
126                 };
127         }
128
129         if (!saw_io || !saw_mem) {
130                 prom_printf("%s: Fatal error, missing %s PBM range.\n",
131                             pbm->name,
132                             (!saw_io ? "IO" : "MEM"));
133                 prom_halt();
134         }
135
136         printk("%s: PCI IO[%lx] MEM[%lx]\n",
137                pbm->name,
138                pbm->io_space.start,
139                pbm->mem_space.start);
140
141         pbm->io_space.name = pbm->mem_space.name = pbm->name;
142
143         request_resource(&ioport_resource, &pbm->io_space);
144         request_resource(&iomem_resource, &pbm->mem_space);
145
146         pci_register_legacy_regions(&pbm->io_space,
147                                     &pbm->mem_space);
148         pci_register_iommu_region(pbm);
149 }
150
151 /* Generic helper routines for PCI error reporting. */
152 void pci_scan_for_target_abort(struct pci_controller_info *p,
153                                struct pci_pbm_info *pbm,
154                                struct pci_bus *pbus)
155 {
156         struct pci_dev *pdev;
157         struct pci_bus *bus;
158
159         list_for_each_entry(pdev, &pbus->devices, bus_list) {
160                 u16 status, error_bits;
161
162                 pci_read_config_word(pdev, PCI_STATUS, &status);
163                 error_bits =
164                         (status & (PCI_STATUS_SIG_TARGET_ABORT |
165                                    PCI_STATUS_REC_TARGET_ABORT));
166                 if (error_bits) {
167                         pci_write_config_word(pdev, PCI_STATUS, error_bits);
168                         printk("PCI%d(PBM%c): Device [%s] saw Target Abort [%016x]\n",
169                                p->index, ((pbm == &p->pbm_A) ? 'A' : 'B'),
170                                pci_name(pdev), status);
171                 }
172         }
173
174         list_for_each_entry(bus, &pbus->children, node)
175                 pci_scan_for_target_abort(p, pbm, bus);
176 }
177
178 void pci_scan_for_master_abort(struct pci_controller_info *p,
179                                struct pci_pbm_info *pbm,
180                                struct pci_bus *pbus)
181 {
182         struct pci_dev *pdev;
183         struct pci_bus *bus;
184
185         list_for_each_entry(pdev, &pbus->devices, bus_list) {
186                 u16 status, error_bits;
187
188                 pci_read_config_word(pdev, PCI_STATUS, &status);
189                 error_bits =
190                         (status & (PCI_STATUS_REC_MASTER_ABORT));
191                 if (error_bits) {
192                         pci_write_config_word(pdev, PCI_STATUS, error_bits);
193                         printk("PCI%d(PBM%c): Device [%s] received Master Abort [%016x]\n",
194                                p->index, ((pbm == &p->pbm_A) ? 'A' : 'B'),
195                                pci_name(pdev), status);
196                 }
197         }
198
199         list_for_each_entry(bus, &pbus->children, node)
200                 pci_scan_for_master_abort(p, pbm, bus);
201 }
202
203 void pci_scan_for_parity_error(struct pci_controller_info *p,
204                                struct pci_pbm_info *pbm,
205                                struct pci_bus *pbus)
206 {
207         struct pci_dev *pdev;
208         struct pci_bus *bus;
209
210         list_for_each_entry(pdev, &pbus->devices, bus_list) {
211                 u16 status, error_bits;
212
213                 pci_read_config_word(pdev, PCI_STATUS, &status);
214                 error_bits =
215                         (status & (PCI_STATUS_PARITY |
216                                    PCI_STATUS_DETECTED_PARITY));
217                 if (error_bits) {
218                         pci_write_config_word(pdev, PCI_STATUS, error_bits);
219                         printk("PCI%d(PBM%c): Device [%s] saw Parity Error [%016x]\n",
220                                p->index, ((pbm == &p->pbm_A) ? 'A' : 'B'),
221                                pci_name(pdev), status);
222                 }
223         }
224
225         list_for_each_entry(bus, &pbus->children, node)
226                 pci_scan_for_parity_error(p, pbm, bus);
227 }