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      1 // SPDX-License-Identifier: GPL-2.0+
      2 /*
      3  * PCI auto-configuration library
      4  *
      5  * Author: Matt Porter <mporter (at) 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 (at) chromium.org>
     12  */
     13 
     14 #include <common.h>
     15 #include <dm.h>
     16 #include <errno.h>
     17 #include <pci.h>
     18 
     19 void pciauto_region_init(struct pci_region *res)
     20 {
     21 	/*
     22 	 * Avoid allocating PCI resources from address 0 -- this is illegal
     23 	 * according to PCI 2.1 and moreover, this is known to cause Linux IDE
     24 	 * drivers to fail. Use a reasonable starting value of 0x1000 instead.
     25 	 */
     26 	res->bus_lower = res->bus_start ? res->bus_start : 0x1000;
     27 }
     28 
     29 void pciauto_region_align(struct pci_region *res, pci_size_t size)
     30 {
     31 	res->bus_lower = ((res->bus_lower - 1) | (size - 1)) + 1;
     32 }
     33 
     34 int pciauto_region_allocate(struct pci_region *res, pci_size_t size,
     35 	pci_addr_t *bar, bool supports_64bit)
     36 {
     37 	pci_addr_t addr;
     38 
     39 	if (!res) {
     40 		debug("No resource\n");
     41 		goto error;
     42 	}
     43 
     44 	addr = ((res->bus_lower - 1) | (size - 1)) + 1;
     45 
     46 	if (addr - res->bus_start + size > res->size) {
     47 		debug("No room in resource");
     48 		goto error;
     49 	}
     50 
     51 	if (upper_32_bits(addr) && !supports_64bit) {
     52 		debug("Cannot assign 64-bit address to 32-bit-only resource\n");
     53 		goto error;
     54 	}
     55 
     56 	res->bus_lower = addr + size;
     57 
     58 	debug("address=0x%llx bus_lower=0x%llx\n", (unsigned long long)addr,
     59 	      (unsigned long long)res->bus_lower);
     60 
     61 	*bar = addr;
     62 	return 0;
     63 
     64  error:
     65 	*bar = (pci_addr_t)-1;
     66 	return -1;
     67 }
     68 
     69 static void pciauto_show_region(const char *name, struct pci_region *region)
     70 {
     71 	pciauto_region_init(region);
     72 	debug("PCI Autoconfig: Bus %s region: [%llx-%llx],\n"
     73 	      "\t\tPhysical Memory [%llx-%llxx]\n", name,
     74 	      (unsigned long long)region->bus_start,
     75 	      (unsigned long long)(region->bus_start + region->size - 1),
     76 	      (unsigned long long)region->phys_start,
     77 	      (unsigned long long)(region->phys_start + region->size - 1));
     78 }
     79 
     80 void pciauto_config_init(struct pci_controller *hose)
     81 {
     82 	int i;
     83 
     84 	hose->pci_io = NULL;
     85 	hose->pci_mem = NULL;
     86 	hose->pci_prefetch = NULL;
     87 
     88 	for (i = 0; i < hose->region_count; i++) {
     89 		switch (hose->regions[i].flags) {
     90 		case PCI_REGION_IO:
     91 			if (!hose->pci_io ||
     92 			    hose->pci_io->size < hose->regions[i].size)
     93 				hose->pci_io = hose->regions + i;
     94 			break;
     95 		case PCI_REGION_MEM:
     96 			if (!hose->pci_mem ||
     97 			    hose->pci_mem->size < hose->regions[i].size)
     98 				hose->pci_mem = hose->regions + i;
     99 			break;
    100 		case (PCI_REGION_MEM | PCI_REGION_PREFETCH):
    101 			if (!hose->pci_prefetch ||
    102 			    hose->pci_prefetch->size < hose->regions[i].size)
    103 				hose->pci_prefetch = hose->regions + i;
    104 			break;
    105 		}
    106 	}
    107 
    108 
    109 	if (hose->pci_mem)
    110 		pciauto_show_region("Memory", hose->pci_mem);
    111 	if (hose->pci_prefetch)
    112 		pciauto_show_region("Prefetchable Mem", hose->pci_prefetch);
    113 	if (hose->pci_io)
    114 		pciauto_show_region("I/O", hose->pci_io);
    115 }
    116