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drivers/pci: Add function to find an extended capability

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PCIe extends device's configuration space to 4k and provides
extended capability. The patch adds function to find them.
The code is ported from Linux PCIe driver.

Signed-off-by: Minghuan Lian <Minghuan.Lian@freescale.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: York Sun <yorksun@freescale.com>
This commit is contained in:
Minghuan Lian 2015-07-10 11:35:08 +08:00 committed by York Sun
parent 87457d118f
commit ed5b580b38
2 changed files with 94 additions and 0 deletions
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53
drivers/pci/pci.c
View File

@ -526,3 +526,56 @@ int pci_find_cap(struct pci_controller *hose, pci_dev_t dev, int pos, int cap)
}
return 0;
}
/**
* pci_find_next_ext_capability - Find an extended capability
*
* Returns the address of the next matching extended capability structure
* within the device's PCI configuration space or 0 if the device does
* not support it. Some capabilities can occur several times, e.g., the
* vendor-specific capability, and this provides a way to find them all.
*/
int pci_find_next_ext_capability(struct pci_controller *hose, pci_dev_t dev,
int start, int cap)
{
u32 header;
int ttl, pos = PCI_CFG_SPACE_SIZE;
/* minimum 8 bytes per capability */
ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8;
if (start)
pos = start;
pci_hose_read_config_dword(hose, dev, pos, &header);
if (header == 0xffffffff || header == 0)
return 0;
while (ttl-- > 0) {
if (PCI_EXT_CAP_ID(header) == cap && pos != start)
return pos;
pos = PCI_EXT_CAP_NEXT(header);
if (pos < PCI_CFG_SPACE_SIZE)
break;
pci_hose_read_config_dword(hose, dev, pos, &header);
if (header == 0xffffffff || header == 0)
break;
}
return 0;
}
/**
* pci_hose_find_ext_capability - Find an extended capability
*
* Returns the address of the requested extended capability structure
* within the device's PCI configuration space or 0 if the device does
* not support it.
*/
int pci_hose_find_ext_capability(struct pci_controller *hose, pci_dev_t dev,
int cap)
{
return pci_find_next_ext_capability(hose, dev, 0, cap);
}

41
include/pci.h
View File

@ -11,6 +11,9 @@
#ifndef _PCI_H
#define _PCI_H
#define PCI_CFG_SPACE_SIZE 256
#define PCI_CFG_SPACE_EXP_SIZE 4096
/*
* Under PCI, each device has 256 bytes of configuration address space,
* of which the first 64 bytes are standardized as follows:
@ -413,6 +416,39 @@
#define PCI_FIND_CAP_TTL 0x48
#define CAP_START_POS 0x40
/* Extended Capabilities (PCI-X 2.0 and Express) */
#define PCI_EXT_CAP_ID(header) (header & 0x0000ffff)
#define PCI_EXT_CAP_VER(header) ((header >> 16) & 0xf)
#define PCI_EXT_CAP_NEXT(header) ((header >> 20) & 0xffc)
#define PCI_EXT_CAP_ID_ERR 0x01 /* Advanced Error Reporting */
#define PCI_EXT_CAP_ID_VC 0x02 /* Virtual Channel Capability */
#define PCI_EXT_CAP_ID_DSN 0x03 /* Device Serial Number */
#define PCI_EXT_CAP_ID_PWR 0x04 /* Power Budgeting */
#define PCI_EXT_CAP_ID_RCLD 0x05 /* Root Complex Link Declaration */
#define PCI_EXT_CAP_ID_RCILC 0x06 /* Root Complex Internal Link Control */
#define PCI_EXT_CAP_ID_RCEC 0x07 /* Root Complex Event Collector */
#define PCI_EXT_CAP_ID_MFVC 0x08 /* Multi-Function VC Capability */
#define PCI_EXT_CAP_ID_VC9 0x09 /* same as _VC */
#define PCI_EXT_CAP_ID_RCRB 0x0A /* Root Complex RB? */
#define PCI_EXT_CAP_ID_VNDR 0x0B /* Vendor-Specific */
#define PCI_EXT_CAP_ID_CAC 0x0C /* Config Access - obsolete */
#define PCI_EXT_CAP_ID_ACS 0x0D /* Access Control Services */
#define PCI_EXT_CAP_ID_ARI 0x0E /* Alternate Routing ID */
#define PCI_EXT_CAP_ID_ATS 0x0F /* Address Translation Services */
#define PCI_EXT_CAP_ID_SRIOV 0x10 /* Single Root I/O Virtualization */
#define PCI_EXT_CAP_ID_MRIOV 0x11 /* Multi Root I/O Virtualization */
#define PCI_EXT_CAP_ID_MCAST 0x12 /* Multicast */
#define PCI_EXT_CAP_ID_PRI 0x13 /* Page Request Interface */
#define PCI_EXT_CAP_ID_AMD_XXX 0x14 /* Reserved for AMD */
#define PCI_EXT_CAP_ID_REBAR 0x15 /* Resizable BAR */
#define PCI_EXT_CAP_ID_DPA 0x16 /* Dynamic Power Allocation */
#define PCI_EXT_CAP_ID_TPH 0x17 /* TPH Requester */
#define PCI_EXT_CAP_ID_LTR 0x18 /* Latency Tolerance Reporting */
#define PCI_EXT_CAP_ID_SECPCI 0x19 /* Secondary PCIe Capability */
#define PCI_EXT_CAP_ID_PMUX 0x1A /* Protocol Multiplexing */
#define PCI_EXT_CAP_ID_PASID 0x1B /* Process Address Space ID */
/* Include the ID list */
#include <pci_ids.h>
@ -687,6 +723,11 @@ extern int pci_hose_find_cap_start(struct pci_controller *hose, pci_dev_t dev,
extern int pci_find_cap(struct pci_controller *hose, pci_dev_t dev, int pos,
int cap);
int pci_find_next_ext_capability(struct pci_controller *hose,
pci_dev_t dev, int start, int cap);
int pci_hose_find_ext_capability(struct pci_controller *hose,
pci_dev_t dev, int cap);
#ifdef CONFIG_PCI_FIXUP_DEV
extern void board_pci_fixup_dev(struct pci_controller *hose, pci_dev_t dev,
unsigned short vendor,