blob: 225b1939b91c37669834c832c1f88c9f8cbe369a [file] [log] [blame]
/*
* Copyright (c) 2009-2010, 2013-2014 Wind River Systems, Inc.
*
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @file
* @brief PCI bus support
*
*
* This module implements the PCI config space access functions
*
*/
#include <kernel.h>
#include <arch/cpu.h>
#include <pci/pci_mgr.h>
#include <string.h>
/**
*
* @brief Write a 32bit data to pci reg in offset
*
* @param bus_no Bus number.
* @param device_no Device number
* @param func_no Function number
* @param offset Offset into the configuration space.
* @param data Data written to the offset.
*
* @return N/A
*/
void pci_config_out_long(uint32_t bus_no, uint32_t device_no, uint32_t func_no,
uint32_t offset, uint32_t data)
{
union pci_addr_reg pci_addr;
/* create the PCI address we're going to access */
pci_addr.field.bus = bus_no;
pci_addr.field.device = device_no;
pci_addr.field.func = func_no;
pci_addr.field.reg = offset / 4;
pci_addr.field.offset = 0;
/* write to the PCI controller */
pci_write(DEFAULT_PCI_CONTROLLER, pci_addr, sizeof(uint32_t), data);
}
/**
*
* @brief Write a 16bit data to pci reg in offset
*
* @param bus_no Bus number.
* @param device_no Device number.
* @param func_no Function number.
* @param offset Offset into the configuration space.
* @param data Data written to the offset.
*
* @return N/A
*/
void pci_config_out_word(uint32_t bus_no, uint32_t device_no, uint32_t func_no,
uint32_t offset, uint16_t data)
{
union pci_addr_reg pci_addr;
/* create the PCI address we're going to access */
pci_addr.field.bus = bus_no;
pci_addr.field.device = device_no;
pci_addr.field.func = func_no;
pci_addr.field.reg = offset / 4;
pci_addr.field.offset = offset & 2;
/* write to the PCI controller */
pci_write(DEFAULT_PCI_CONTROLLER, pci_addr, sizeof(uint16_t), data);
}
/**
*
* @brief Write a 8bit data to pci reg in offset
*
* @param bus_no Bus number.
* @param device_no Device number.
* @param func_no Function number.
* @param offset Offset into the configuration space.
* @param data Data written to the offset.
*
* @return N/A
*/
void pci_config_out_byte(uint32_t bus_no, uint32_t device_no, uint32_t func_no,
uint32_t offset, uint8_t data)
{
union pci_addr_reg pci_addr;
/* create the PCI address we're going to access */
pci_addr.field.bus = bus_no;
pci_addr.field.device = device_no;
pci_addr.field.func = func_no;
pci_addr.field.reg = offset / 4;
pci_addr.field.offset = offset % 4;
/* write to the PCI controller */
pci_write(DEFAULT_PCI_CONTROLLER, pci_addr, sizeof(uint8_t), data);
}
/**
*
* @brief Read a 32bit data from pci reg in offset
*
* @param bus_no Bus number.
* @param device_no Device number.
* @param func_no Function number.
* @param offset Offset into the configuration space.
* @param data Data read from the offset.
*
* @return N/A
*
*/
void pci_config_in_long(uint32_t bus_no, uint32_t device_no, uint32_t func_no,
uint32_t offset, uint32_t *data)
{
union pci_addr_reg pci_addr;
/* create the PCI address we're going to access */
pci_addr.field.bus = bus_no;
pci_addr.field.device = device_no;
pci_addr.field.func = func_no;
pci_addr.field.reg = offset / 4;
pci_addr.field.offset = 0;
/* read from the PCI controller */
pci_read(DEFAULT_PCI_CONTROLLER, pci_addr, sizeof(uint32_t), data);
}
/**
*
* @brief Read in a 16bit data from a pci reg in offset
*
* @param bus_no Bus number.
* @param device_no Device number.
* @param func_no Function number.
* @param offset Offset into the configuration space.
* @param data Data read from the offset.
*
* @return N/A
*
*/
void pci_config_in_word(uint32_t bus_no, uint32_t device_no, uint32_t func_no,
uint32_t offset, uint16_t *data)
{
union pci_addr_reg pci_addr;
uint32_t pci_data;
/* create the PCI address we're going to access */
pci_addr.field.bus = bus_no;
pci_addr.field.device = device_no;
pci_addr.field.func = func_no;
pci_addr.field.reg = offset / 4;
pci_addr.field.offset = offset & 2;
/* read from the PCI controller */
pci_read(DEFAULT_PCI_CONTROLLER, pci_addr, sizeof(uint16_t), &pci_data);
/* return the data */
*data = (uint16_t)pci_data;
}
/**
*
* @brief Read in a 8bit data from a pci reg in offset
*
* @param bus_no Bus number.
* @param device_no Device number.
* @param func_no Function number.
* @param offset Offset into the configuration space.
* @param data Data read from the offset.
*
* @return N/A
*
*/
void pci_config_in_byte(uint32_t bus_no, uint32_t device_no, uint32_t func_no,
uint32_t offset, uint8_t *data)
{
union pci_addr_reg pci_addr;
uint32_t pci_data;
/* create the PCI address we're going to access */
pci_addr.field.bus = bus_no;
pci_addr.field.device = device_no;
pci_addr.field.func = func_no;
pci_addr.field.reg = offset / 4;
pci_addr.field.offset = offset % 4;
/* read from the PCI controller */
pci_read(DEFAULT_PCI_CONTROLLER, pci_addr, sizeof(uint8_t), &pci_data);
/* return the data */
*data = (uint8_t)pci_data;
}
/**
*
* @brief Find extended capability in ECP linked list
*
* This routine searches for an extended capability in the linked list of
* capabilities in config space. If found, the offset of the first byte
* of the capability of interest in config space is returned via pOffset.
*
* @param ext_cap_find_id Extended capabilities ID to search for.
* @param bus PCI bus number.
* @param device PCI device number.
* @param function PCI function number.
* @param p_offset Returned config space offset.
*
* @return 0 if Extended Capability found, -1 otherwise
*
*/
int pci_config_ext_cap_ptr_find(uint8_t ext_cap_find_id, uint32_t bus,
uint32_t device, uint32_t function,
uint8_t *p_offset)
{
uint16_t tmp_stat;
uint8_t tmp_offset;
uint8_t cap_offset = 0x00;
uint8_t cap_id = 0x00;
/* Check to see if the device has any extended capabilities */
pci_config_in_word(bus, device, function, PCI_CFG_STATUS, &tmp_stat);
if ((tmp_stat & PCI_STATUS_NEW_CAP) == 0) {
return -1;
}
/* Get the initial ECP offset and make longword aligned */
pci_config_in_byte(bus, device, function, PCI_CFG_CAP_PTR, &cap_offset);
cap_offset &= ~0x02;
/* Bounds check the ECP offset */
if (cap_offset < 0x40) {
return -1;
}
/* Look for the specified Extended Cap item in the linked list */
while (cap_offset != 0x00) {
/* Get the Capability ID and check */
pci_config_in_byte(bus, device, function, (int)cap_offset, &cap_id);
if (cap_id == ext_cap_find_id) {
*p_offset = cap_offset;
return 0;
}
/* Get the offset to the next New Capabilities item */
tmp_offset = cap_offset + (uint8_t)0x01;
pci_config_in_byte(bus, device, function, (int)tmp_offset, &cap_offset);
}
return -1;
}