]> git.sur5r.net Git - u-boot/blob - drivers/pci/pci_auto_common.c
dm: pci: Move common auto-config functions to a common file
[u-boot] / drivers / pci / pci_auto_common.c
1 /*
2  * PCI auto-configuration library
3  *
4  * Author: Matt Porter <mporter@mvista.com>
5  *
6  * Copyright 2000 MontaVista Software Inc.
7  *
8  * Modifications for driver model:
9  * Copyright 2015 Google, Inc
10  * Written by Simon Glass <sjg@chromium.org>
11  *
12  * SPDX-License-Identifier:     GPL-2.0+
13  */
14
15 #include <common.h>
16 #include <dm.h>
17 #include <errno.h>
18 #include <pci.h>
19
20 void pciauto_region_init(struct pci_region *res)
21 {
22         /*
23          * Avoid allocating PCI resources from address 0 -- this is illegal
24          * according to PCI 2.1 and moreover, this is known to cause Linux IDE
25          * drivers to fail. Use a reasonable starting value of 0x1000 instead.
26          */
27         res->bus_lower = res->bus_start ? res->bus_start : 0x1000;
28 }
29
30 void pciauto_region_align(struct pci_region *res, pci_size_t size)
31 {
32         res->bus_lower = ((res->bus_lower - 1) | (size - 1)) + 1;
33 }
34
35 int pciauto_region_allocate(struct pci_region *res, pci_size_t size,
36         pci_addr_t *bar)
37 {
38         pci_addr_t addr;
39
40         if (!res) {
41                 debug("No resource");
42                 goto error;
43         }
44
45         addr = ((res->bus_lower - 1) | (size - 1)) + 1;
46
47         if (addr - res->bus_start + size > res->size) {
48                 debug("No room in resource");
49                 goto error;
50         }
51
52         res->bus_lower = addr + size;
53
54         debug("address=0x%llx bus_lower=0x%llx", (unsigned long long)addr,
55               (unsigned long long)res->bus_lower);
56
57         *bar = addr;
58         return 0;
59
60  error:
61         *bar = (pci_addr_t)-1;
62         return -1;
63 }
64
65 void pciauto_config_init(struct pci_controller *hose)
66 {
67         int i;
68
69         hose->pci_io = NULL;
70         hose->pci_mem = NULL;
71         hose->pci_prefetch = NULL;
72
73         for (i = 0; i < hose->region_count; i++) {
74                 switch (hose->regions[i].flags) {
75                 case PCI_REGION_IO:
76                         if (!hose->pci_io ||
77                             hose->pci_io->size < hose->regions[i].size)
78                                 hose->pci_io = hose->regions + i;
79                         break;
80                 case PCI_REGION_MEM:
81                         if (!hose->pci_mem ||
82                             hose->pci_mem->size < hose->regions[i].size)
83                                 hose->pci_mem = hose->regions + i;
84                         break;
85                 case (PCI_REGION_MEM | PCI_REGION_PREFETCH):
86                         if (!hose->pci_prefetch ||
87                             hose->pci_prefetch->size < hose->regions[i].size)
88                                 hose->pci_prefetch = hose->regions + i;
89                         break;
90                 }
91         }
92
93
94         if (hose->pci_mem) {
95                 pciauto_region_init(hose->pci_mem);
96
97                 debug("PCI Autoconfig: Bus Memory region: [0x%llx-0x%llx],\n"
98                        "\t\tPhysical Memory [%llx-%llxx]\n",
99                     (u64)hose->pci_mem->bus_start,
100                     (u64)(hose->pci_mem->bus_start + hose->pci_mem->size - 1),
101                     (u64)hose->pci_mem->phys_start,
102                     (u64)(hose->pci_mem->phys_start + hose->pci_mem->size - 1));
103         }
104
105         if (hose->pci_prefetch) {
106                 pciauto_region_init(hose->pci_prefetch);
107
108                 debug("PCI Autoconfig: Bus Prefetchable Mem: [0x%llx-0x%llx],\n"
109                        "\t\tPhysical Memory [%llx-%llx]\n",
110                     (u64)hose->pci_prefetch->bus_start,
111                     (u64)(hose->pci_prefetch->bus_start +
112                             hose->pci_prefetch->size - 1),
113                     (u64)hose->pci_prefetch->phys_start,
114                     (u64)(hose->pci_prefetch->phys_start +
115                             hose->pci_prefetch->size - 1));
116         }
117
118         if (hose->pci_io) {
119                 pciauto_region_init(hose->pci_io);
120
121                 debug("PCI Autoconfig: Bus I/O region: [0x%llx-0x%llx],\n"
122                        "\t\tPhysical Memory: [%llx-%llx]\n",
123                     (u64)hose->pci_io->bus_start,
124                     (u64)(hose->pci_io->bus_start + hose->pci_io->size - 1),
125                     (u64)hose->pci_io->phys_start,
126                     (u64)(hose->pci_io->phys_start + hose->pci_io->size - 1));
127         }
128 }