xref: /openbmc/linux/drivers/pci/vpd.c (revision c819e2cf)
1  /*
2   * File:	vpd.c
3   * Purpose:	Provide PCI VPD support
4   *
5   * Copyright (C) 2010 Broadcom Corporation.
6   */
7  
8  #include <linux/pci.h>
9  #include <linux/export.h>
10  
11  int pci_vpd_find_tag(const u8 *buf, unsigned int off, unsigned int len, u8 rdt)
12  {
13  	int i;
14  
15  	for (i = off; i < len; ) {
16  		u8 val = buf[i];
17  
18  		if (val & PCI_VPD_LRDT) {
19  			/* Don't return success of the tag isn't complete */
20  			if (i + PCI_VPD_LRDT_TAG_SIZE > len)
21  				break;
22  
23  			if (val == rdt)
24  				return i;
25  
26  			i += PCI_VPD_LRDT_TAG_SIZE +
27  			     pci_vpd_lrdt_size(&buf[i]);
28  		} else {
29  			u8 tag = val & ~PCI_VPD_SRDT_LEN_MASK;
30  
31  			if (tag == rdt)
32  				return i;
33  
34  			if (tag == PCI_VPD_SRDT_END)
35  				break;
36  
37  			i += PCI_VPD_SRDT_TAG_SIZE +
38  			     pci_vpd_srdt_size(&buf[i]);
39  		}
40  	}
41  
42  	return -ENOENT;
43  }
44  EXPORT_SYMBOL_GPL(pci_vpd_find_tag);
45  
46  int pci_vpd_find_info_keyword(const u8 *buf, unsigned int off,
47  			      unsigned int len, const char *kw)
48  {
49  	int i;
50  
51  	for (i = off; i + PCI_VPD_INFO_FLD_HDR_SIZE <= off + len;) {
52  		if (buf[i + 0] == kw[0] &&
53  		    buf[i + 1] == kw[1])
54  			return i;
55  
56  		i += PCI_VPD_INFO_FLD_HDR_SIZE +
57  		     pci_vpd_info_field_size(&buf[i]);
58  	}
59  
60  	return -ENOENT;
61  }
62  EXPORT_SYMBOL_GPL(pci_vpd_find_info_keyword);
63