1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * PCI auto-configuration library
4 *
5 * Author: Matt Porter <mporter@mvista.com>
6 *
7 * Copyright 2000 MontaVista Software Inc.
8 *
9 * Modifications for driver model:
10 * Copyright 2015 Google, Inc
11 * Written by Simon Glass <sjg@chromium.org>
12 */
13
14 #include <common.h>
15 #include <dm.h>
16 #include <errno.h>
17 #include <log.h>
18 #include <pci.h>
19
pciauto_region_init(struct pci_region * res)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 * if the bus start address is below 0x1000.
27 */
28 res->bus_lower = res->bus_start < 0x1000 ? 0x1000 : res->bus_start;
29 }
30
pciauto_region_align(struct pci_region * res,pci_size_t size)31 void pciauto_region_align(struct pci_region *res, pci_size_t size)
32 {
33 res->bus_lower = ((res->bus_lower - 1) | (size - 1)) + 1;
34 }
35
pciauto_region_allocate(struct pci_region * res,pci_size_t size,pci_addr_t * bar,bool supports_64bit)36 int pciauto_region_allocate(struct pci_region *res, pci_size_t size,
37 pci_addr_t *bar, bool supports_64bit)
38 {
39 pci_addr_t addr;
40
41 if (!res) {
42 debug("No resource\n");
43 goto error;
44 }
45
46 addr = ((res->bus_lower - 1) | (size - 1)) + 1;
47
48 if (addr - res->bus_start + size > res->size) {
49 debug("No room in resource, avail start=%llx / size=%llx, "
50 "need=%llx\n", (unsigned long long)res->bus_lower,
51 (unsigned long long)res->size, (unsigned long long)size);
52 goto error;
53 }
54
55 if (upper_32_bits(addr) && !supports_64bit) {
56 debug("Cannot assign 64-bit address to 32-bit-only resource\n");
57 goto error;
58 }
59
60 res->bus_lower = addr + size;
61
62 debug("address=0x%llx bus_lower=0x%llx\n", (unsigned long long)addr,
63 (unsigned long long)res->bus_lower);
64
65 *bar = addr;
66 return 0;
67
68 error:
69 *bar = (pci_addr_t)-1;
70 return -1;
71 }
72
pciauto_show_region(const char * name,struct pci_region * region)73 static void pciauto_show_region(const char *name, struct pci_region *region)
74 {
75 pciauto_region_init(region);
76 debug("PCI Autoconfig: Bus %s region: [%llx-%llx],\n"
77 "\t\tPhysical Memory [%llx-%llxx]\n", name,
78 (unsigned long long)region->bus_start,
79 (unsigned long long)(region->bus_start + region->size - 1),
80 (unsigned long long)region->phys_start,
81 (unsigned long long)(region->phys_start + region->size - 1));
82 }
83
pciauto_config_init(struct pci_controller * hose)84 void pciauto_config_init(struct pci_controller *hose)
85 {
86 int i;
87
88 hose->pci_io = NULL;
89 hose->pci_mem = NULL;
90 hose->pci_prefetch = NULL;
91
92 for (i = 0; i < hose->region_count; i++) {
93 switch (hose->regions[i].flags) {
94 case PCI_REGION_IO:
95 if (!hose->pci_io ||
96 hose->pci_io->size < hose->regions[i].size)
97 hose->pci_io = hose->regions + i;
98 break;
99 case PCI_REGION_MEM:
100 if (!hose->pci_mem ||
101 hose->pci_mem->size < hose->regions[i].size)
102 hose->pci_mem = hose->regions + i;
103 break;
104 case (PCI_REGION_MEM | PCI_REGION_PREFETCH):
105 if (!hose->pci_prefetch ||
106 hose->pci_prefetch->size < hose->regions[i].size)
107 hose->pci_prefetch = hose->regions + i;
108 break;
109 }
110 }
111
112
113 if (hose->pci_mem)
114 pciauto_show_region("Memory", hose->pci_mem);
115 if (hose->pci_prefetch)
116 pciauto_show_region("Prefetchable Mem", hose->pci_prefetch);
117 if (hose->pci_io)
118 pciauto_show_region("I/O", hose->pci_io);
119 }
120