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/*
* (C) Copyright IBM Corporation 2006
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* on the rights to use, copy, modify, merge, publish, distribute, sub
* license, and/or sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
/**
* \file common_interface.c
* Platform independent interface glue.
*
* \author Ian Romanick <idr@us.ibm.com>
*/
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "pciaccess.h"
#include "pciaccess_private.h"
#if defined(__linux__) || defined(__GLIBC__)
#include <byteswap.h>
#if __BYTE_ORDER == __BIG_ENDIAN
# define LETOH_16(x) bswap_16(x)
# define HTOLE_16(x) bswap_16(x)
# define LETOH_32(x) bswap_32(x)
# define HTOLE_32(x) bswap_32(x)
#else
# define LETOH_16(x) (x)
# define HTOLE_16(x) (x)
# define LETOH_32(x) (x)
# define HTOLE_32(x) (x)
#endif /* linux */
#elif defined(__sun)
#include <sys/byteorder.h>
#ifdef _BIG_ENDIAN
# define LETOH_16(x) BSWAP_16(x)
# define HTOLE_16(x) BSWAP_16(x)
# define LETOH_32(x) BSWAP_32(x)
# define HTOLE_32(x) BSWAP_32(x)
#else
# define LETOH_16(x) (x)
# define HTOLE_16(x) (x)
# define LETOH_32(x) (x)
# define HTOLE_32(x) (x)
#endif /* Solaris */
#else
#include <sys/endian.h>
#define HTOLE_16(x) htole16(x)
#define HTOLE_32(x) htole32(x)
#if defined(__FreeBSD__) || defined(__DragonFly__) || defined(__NetBSD__)
#define LETOH_16(x) le16toh(x)
#define LETOH_32(x) le32toh(x)
#else
#define LETOH_16(x) letoh16(x)
#define LETOH_32(x) letoh32(x)
#endif
#endif /* others */
/**
* Read a device's expansion ROM.
*
* Reads the device's expansion ROM and stores the data in the memory pointed
* to by \c buffer. The buffer must be at least \c pci_device::rom_size
* bytes.
*
* \param dev Device whose expansion ROM is to be read.
* \param buffer Memory in which to store the ROM.
*
* \return
* Zero on success or an \c errno value on failure.
*/
int
pci_device_read_rom( struct pci_device * dev, void * buffer )
{
if ( (dev == NULL) || (buffer == NULL) ) {
return EFAULT;
}
return (pci_sys->methods->read_rom)( dev, buffer );
}
/**
* Probe a PCI (VGA) device to determine if its the boot VGA device
*
* \param dev Device whose VGA status to query
* \return
* Zero if not the boot VGA, 1 if the boot VGA.
*/
int
pci_device_is_boot_vga( struct pci_device * dev )
{
if (!pci_sys->methods->boot_vga)
return 0;
return pci_sys->methods->boot_vga( dev );
}
/**
* Probe a PCI device to determine if a kernel driver is attached.
*
* \param dev Device to query
* \return
* Zero if no driver attached, 1 if attached kernel drviver
*/
int
pci_device_has_kernel_driver( struct pci_device * dev )
{
if (!pci_sys->methods->has_kernel_driver)
return 0;
return pci_sys->methods->has_kernel_driver( dev );
}
/**
* Probe a PCI device to learn information about the device.
*
* Probes a PCI device to learn various information about the device. Before
* calling this function, the only public fields in the \c pci_device
* structure that have valid values are \c pci_device::domain,
* \c pci_device::bus, \c pci_device::dev, and \c pci_device::func.
*
* \param dev Device to be probed.
*
* \return
* Zero on success or an \c errno value on failure.
*/
int
pci_device_probe( struct pci_device * dev )
{
if ( dev == NULL ) {
return EFAULT;
}
return (pci_sys->methods->probe)( dev );
}
/**
* Map the specified BAR so that it can be accessed by the CPU.
*
* Maps the specified BAR for access by the processor. The pointer to the
* mapped region is stored in the \c pci_mem_region::memory pointer for the
* BAR.
*
* \param dev Device whose memory region is to be mapped.
* \param region Region, on the range [0, 5], that is to be mapped.
* \param write_enable Map for writing (non-zero).
*
* \return
* Zero on success or an \c errno value on failure.
*
* \sa pci_device_map_range, pci_device_unmap_range
* \deprecated
*/
int
pci_device_map_region(struct pci_device * dev, unsigned region,
int write_enable)
{
const unsigned map_flags =
(write_enable) ? PCI_DEV_MAP_FLAG_WRITABLE : 0;
if ((region > 5) || (dev->regions[region].size == 0)) {
return ENOENT;
}
if (dev->regions[region].memory != NULL) {
return 0;
}
return pci_device_map_range(dev, dev->regions[region].base_addr,
dev->regions[region].size, map_flags,
&dev->regions[region].memory);
}
/**
* Map the specified memory range so that it can be accessed by the CPU.
*
* Maps the specified memory range for access by the processor. The pointer
* to the mapped region is stored in \c addr. In addition, the
* \c pci_mem_region::memory pointer for the BAR will be updated.
*
* \param dev Device whose memory region is to be mapped.
* \param base Base address of the range to be mapped.
* \param size Size of the range to be mapped.
* \param write_enable Map for writing (non-zero).
* \param addr Location to store the mapped address.
*
* \return
* Zero on success or an \c errno value on failure.
*
* \sa pci_device_map_range
*/
int pci_device_map_memory_range(struct pci_device *dev,
pciaddr_t base, pciaddr_t size,
int write_enable, void **addr)
{
return pci_device_map_range(dev, base, size,
(write_enable) ? PCI_DEV_MAP_FLAG_WRITABLE : 0,
addr);
}
/**
* Map the specified memory range so that it can be accessed by the CPU.
*
* Maps the specified memory range for access by the processor. The pointer
* to the mapped region is stored in \c addr. In addition, the
* \c pci_mem_region::memory pointer for the BAR will be updated.
*
* \param dev Device whose memory region is to be mapped.
* \param base Base address of the range to be mapped.
* \param size Size of the range to be mapped.
* \param map_flags Flag bits controlling how the mapping is accessed.
* \param addr Location to store the mapped address.
*
* \return
* Zero on success or an \c errno value on failure.
*
* \sa pci_device_unmap_range
*/
int
pci_device_map_range(struct pci_device *dev, pciaddr_t base,
pciaddr_t size, unsigned map_flags,
void **addr)
{
struct pci_device_private *const devp =
(struct pci_device_private *) dev;
struct pci_device_mapping *mappings;
unsigned region;
unsigned i;
int err = 0;
*addr = NULL;
if (dev == NULL) {
return EFAULT;
}
for (region = 0; region < 6; region++) {
const struct pci_mem_region const* r = &dev->regions[region];
if (r->size != 0) {
if ((r->base_addr <= base) && ((r->base_addr + r->size) > base)) {
if ((base + size) > (r->base_addr + r->size)) {
return E2BIG;
}
break;
}
}
}
if (region > 5) {
return ENOENT;
}
/* Make sure that there isn't already a mapping with the same base and
* size.
*/
for (i = 0; i < devp->num_mappings; i++) {
if ((devp->mappings[i].base == base)
&& (devp->mappings[i].size == size)) {
return EINVAL;
}
}
mappings = realloc(devp->mappings,
(sizeof(devp->mappings[0]) * (devp->num_mappings + 1)));
if (mappings == NULL) {
return ENOMEM;
}
mappings[devp->num_mappings].base = base;
mappings[devp->num_mappings].size = size;
mappings[devp->num_mappings].region = region;
mappings[devp->num_mappings].flags = map_flags;
mappings[devp->num_mappings].memory = NULL;
if (dev->regions[region].memory == NULL) {
err = (*pci_sys->methods->map_range)(dev,
&mappings[devp->num_mappings]);
}
if (err == 0) {
*addr = mappings[devp->num_mappings].memory;
devp->num_mappings++;
} else {
mappings = realloc(mappings,
(sizeof(mappings[0]) * devp->num_mappings));
}
devp->mappings = mappings;
return err;
}
/**
* Unmap the specified BAR so that it can no longer be accessed by the CPU.
*
* Unmaps the specified BAR that was previously mapped via
* \c pci_device_map_region.
*
* \param dev Device whose memory region is to be mapped.
* \param region Region, on the range [0, 5], that is to be mapped.
*
* \return
* Zero on success or an \c errno value on failure.
*
* \sa pci_device_map_range, pci_device_unmap_range
* \deprecated
*/
int
pci_device_unmap_region( struct pci_device * dev, unsigned region )
{
int err;
if (dev == NULL) {
return EFAULT;
}
if ((region > 5) || (dev->regions[region].size == 0)) {
return ENOENT;
}
err = pci_device_unmap_range(dev, dev->regions[region].memory,
dev->regions[region].size);
if (!err) {
dev->regions[region].memory = NULL;
}
return err;
}
/**
* Unmap the specified memory range so that it can no longer be accessed by the CPU.
*
* Unmaps the specified memory range that was previously mapped via
* \c pci_device_map_memory_range.
*
* \param dev Device whose memory is to be unmapped.
* \param memory Pointer to the base of the mapped range.
* \param size Size, in bytes, of the range to be unmapped.
*
* \return
* Zero on success or an \c errno value on failure.
*
* \sa pci_device_map_range, pci_device_unmap_range
* \deprecated
*/
int
pci_device_unmap_memory_range(struct pci_device *dev, void *memory,
pciaddr_t size)
{
return pci_device_unmap_range(dev, memory, size);
}
/**
* Unmap the specified memory range so that it can no longer be accessed by the CPU.
*
* Unmaps the specified memory range that was previously mapped via
* \c pci_device_map_memory_range.
*
* \param dev Device whose memory is to be unmapped.
* \param memory Pointer to the base of the mapped range.
* \param size Size, in bytes, of the range to be unmapped.
*
* \return
* Zero on success or an \c errno value on failure.
*
* \sa pci_device_map_range
*/
int
pci_device_unmap_range(struct pci_device *dev, void *memory,
pciaddr_t size)
{
struct pci_device_private *const devp =
(struct pci_device_private *) dev;
unsigned i;
int err;
if (dev == NULL) {
return EFAULT;
}
for (i = 0; i < devp->num_mappings; i++) {
if ((devp->mappings[i].memory == memory)
&& (devp->mappings[i].size == size)) {
break;
}
}
if (i == devp->num_mappings) {
return ENOENT;
}
err = (*pci_sys->methods->unmap_range)(dev, &devp->mappings[i]);
if (!err) {
const unsigned entries_to_move = (devp->num_mappings - i) - 1;
if (entries_to_move > 0) {
(void) memmove(&devp->mappings[i],
&devp->mappings[i + 1],
entries_to_move * sizeof(devp->mappings[0]));
}
devp->num_mappings--;
devp->mappings = realloc(devp->mappings,
(sizeof(devp->mappings[0]) * devp->num_mappings));
}
return err;
}
/**
* Read arbitrary bytes from device's PCI config space
*
* Reads data from the device's PCI configuration space. As with the system
* read command, less data may be returned, without an error, than was
* requested. This is particularly the case if a non-root user tries to read
* beyond the first 64-bytes of configuration space.
*
* \param dev Device whose PCI configuration data is to be read.
* \param data Location to store the data
* \param offset Initial byte offset to read
* \param size Total number of bytes to read
* \param bytes_read Location to store the actual number of bytes read. This
* pointer may be \c NULL.
*
* \returns
* Zero on success or an errno value on failure.
*
* \note
* Data read from PCI configuration space using this routine is \b not
* byte-swapped to the host's byte order. PCI configuration data is always
* stored in little-endian order, and that is what this routine returns.
*/
int
pci_device_cfg_read( struct pci_device * dev, void * data,
pciaddr_t offset, pciaddr_t size,
pciaddr_t * bytes_read )
{
pciaddr_t scratch;
if ( (dev == NULL) || (data == NULL) ) {
return EFAULT;
}
return pci_sys->methods->read( dev, data, offset, size,
(bytes_read == NULL)
? & scratch : bytes_read );
}
int
pci_device_cfg_read_u8( struct pci_device * dev, uint8_t * data,
pciaddr_t offset )
{
pciaddr_t bytes;
int err = pci_device_cfg_read( dev, data, offset, 1, & bytes );
if ( (err == 0) && (bytes != 1) ) {
err = ENXIO;
}
return err;
}
int
pci_device_cfg_read_u16( struct pci_device * dev, uint16_t * data,
pciaddr_t offset )
{
pciaddr_t bytes;
int err = pci_device_cfg_read( dev, data, offset, 2, & bytes );
if ( (err == 0) && (bytes != 2) ) {
err = ENXIO;
}
*data = LETOH_16( *data );
return err;
}
int
pci_device_cfg_read_u32( struct pci_device * dev, uint32_t * data,
pciaddr_t offset )
{
pciaddr_t bytes;
int err = pci_device_cfg_read( dev, data, offset, 4, & bytes );
if ( (err == 0) && (bytes != 4) ) {
err = ENXIO;
}
*data = LETOH_32( *data );
return err;
}
/**
* Write arbitrary bytes to device's PCI config space
*
* Writes data to the device's PCI configuration space. As with the system
* write command, less data may be written, without an error, than was
* requested.
*
* \param dev Device whose PCI configuration data is to be written.
* \param data Location of the source data
* \param offset Initial byte offset to write
* \param size Total number of bytes to write
* \param bytes_read Location to store the actual number of bytes written.
* This pointer may be \c NULL.
*
* \returns
* Zero on success or an errno value on failure.
*
* \note
* Data written to PCI configuration space using this routine is \b not
* byte-swapped from the host's byte order. PCI configuration data is always
* stored in little-endian order, so data written with this routine should be
* put in that order in advance.
*/
int
pci_device_cfg_write( struct pci_device * dev, const void * data,
pciaddr_t offset, pciaddr_t size,
pciaddr_t * bytes_written )
{
pciaddr_t scratch;
if ( (dev == NULL) || (data == NULL) ) {
return EFAULT;
}
return pci_sys->methods->write( dev, data, offset, size,
(bytes_written == NULL)
? & scratch : bytes_written );
}
int
pci_device_cfg_write_u8(struct pci_device *dev, uint8_t data,
pciaddr_t offset)
{
pciaddr_t bytes;
int err = pci_device_cfg_write(dev, & data, offset, 1, & bytes);
if ( (err == 0) && (bytes != 1) ) {
err = ENOSPC;
}
return err;
}
int
pci_device_cfg_write_u16(struct pci_device *dev, uint16_t data,
pciaddr_t offset)
{
pciaddr_t bytes;
const uint16_t temp = HTOLE_16(data);
int err = pci_device_cfg_write( dev, & temp, offset, 2, & bytes );
if ( (err == 0) && (bytes != 2) ) {
err = ENOSPC;
}
return err;
}
int
pci_device_cfg_write_u32(struct pci_device *dev, uint32_t data,
pciaddr_t offset)
{
pciaddr_t bytes;
const uint32_t temp = HTOLE_32(data);
int err = pci_device_cfg_write( dev, & temp, offset, 4, & bytes );
if ( (err == 0) && (bytes != 4) ) {
err = ENOSPC;
}
return err;
}
int
pci_device_cfg_write_bits( struct pci_device * dev, uint32_t mask,
uint32_t data, pciaddr_t offset )
{
uint32_t temp;
int err;
err = pci_device_cfg_read_u32( dev, & temp, offset );
if ( ! err ) {
temp &= ~mask;
temp |= data;
err = pci_device_cfg_write_u32(dev, temp, offset);
}
return err;
}
void
pci_device_enable(struct pci_device *dev)
{
if (dev == NULL) {
return;
}
if (pci_sys->methods->enable)
pci_sys->methods->enable(dev);
}
/**
* Map the legacy memory space for the PCI domain containing \c dev.
*
* \param dev Device whose memory region is to be mapped.
* \param base Base address of the range to be mapped.
* \param size Size of the range to be mapped.
* \param map_flags Flag bits controlling how the mapping is accessed.
* \param addr Location to store the mapped address.
*
* \returns
* Zero on success or an \c errno value on failure.
*/
int
pci_device_map_legacy(struct pci_device *dev, pciaddr_t base, pciaddr_t size,
unsigned map_flags, void **addr)
{
if (base > 0x100000 || base + size > 0x100000)
return EINVAL;
if (!pci_sys->methods->map_legacy)
return ENOSYS;
return pci_sys->methods->map_legacy(dev, base, size, map_flags, addr);
}
/**
* Unmap the legacy memory space for the PCI domain containing \c dev.
*
* \param dev Device whose memory region is to be unmapped.
* \param addr Location of the mapped address.
* \param size Size of the range to be unmapped.
*
* \returns
* Zero on success or an \c errno value on failure.
*/
int
pci_device_unmap_legacy(struct pci_device *dev, void *addr, pciaddr_t size)
{
if (!pci_sys->methods->unmap_legacy)
return ENOSYS;
return pci_sys->methods->unmap_legacy(dev, addr, size);
}