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011e9482 SG |
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 | ||
02c80a0e SG |
65 | static void pciauto_show_region(const char *name, struct pci_region *region) |
66 | { | |
67 | pciauto_region_init(region); | |
68 | debug("PCI Autoconfig: Bus %s region: [%llx-%llx],\n" | |
69 | "\t\tPhysical Memory [%llx-%llxx]\n", name, | |
70 | (unsigned long long)region->bus_start, | |
71 | (unsigned long long)(region->bus_start + region->size - 1), | |
72 | (unsigned long long)region->phys_start, | |
73 | (unsigned long long)(region->phys_start + region->size - 1)); | |
74 | } | |
75 | ||
011e9482 SG |
76 | void pciauto_config_init(struct pci_controller *hose) |
77 | { | |
78 | int i; | |
79 | ||
80 | hose->pci_io = NULL; | |
81 | hose->pci_mem = NULL; | |
82 | hose->pci_prefetch = NULL; | |
83 | ||
84 | for (i = 0; i < hose->region_count; i++) { | |
85 | switch (hose->regions[i].flags) { | |
86 | case PCI_REGION_IO: | |
87 | if (!hose->pci_io || | |
88 | hose->pci_io->size < hose->regions[i].size) | |
89 | hose->pci_io = hose->regions + i; | |
90 | break; | |
91 | case PCI_REGION_MEM: | |
92 | if (!hose->pci_mem || | |
93 | hose->pci_mem->size < hose->regions[i].size) | |
94 | hose->pci_mem = hose->regions + i; | |
95 | break; | |
96 | case (PCI_REGION_MEM | PCI_REGION_PREFETCH): | |
97 | if (!hose->pci_prefetch || | |
98 | hose->pci_prefetch->size < hose->regions[i].size) | |
99 | hose->pci_prefetch = hose->regions + i; | |
100 | break; | |
101 | } | |
102 | } | |
103 | ||
104 | ||
02c80a0e SG |
105 | if (hose->pci_mem) |
106 | pciauto_show_region("Memory", hose->pci_mem); | |
107 | if (hose->pci_prefetch) | |
108 | pciauto_show_region("Prefetchable Mem", hose->pci_prefetch); | |
109 | if (hose->pci_io) | |
110 | pciauto_show_region("I/O", hose->pci_io); | |
011e9482 | 111 | } |