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 }
129