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 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 
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 
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);
111 }
112