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/*
* Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/syslog.h>
#include <sys/errno.h>
#include <dev/pci/pci.h>
#include <dev/pci/pciregs.h>
#include <vm/dynalloc.h>
#include <lib/assert.h>
#define pr_trace(fmt, ...) kprintf("pci: " fmt, ##__VA_ARGS__)
static TAILQ_HEAD(, pci_device) device_list;
static bool
pci_dev_exists(uint8_t bus, uint8_t slot, uint8_t func)
{
uint16_t vendor_id;
struct pci_device dev_tmp;
dev_tmp.bus = bus;
dev_tmp.slot = slot;
dev_tmp.func = func;
vendor_id = pci_readl(&dev_tmp, PCIREG_VENDOR_ID);
if (vendor_id == 0xFFFF) {
return false;
}
return true;
}
/*
* Attempt to search for a capability within the device
* capability list if it supports one.
*
* @dev: Target device.
* @id: Requested capability ID.
*
* The offset is returned if found, otherwise 0.
* A value less than zero is returned on error.
*/
static int
pci_get_cap(struct pci_device *dev, uint8_t id)
{
uint16_t status;
uint32_t cap;
uint8_t curid;
uint8_t cap_ptr;
/* Does the device even support this? */
status = pci_readl(dev, PCIREG_CMDSTATUS) >> 16;
if (!ISSET(status, PCI_STATUS_CAPLIST)) {
return -ENOTSUP;
}
cap_ptr = pci_readl(dev, PCIREG_CAPPTR) & 0xFF;
/* Go through the capability list */
while (cap_ptr != 0) {
cap = pci_readl(dev, cap_ptr);
curid = cap & 0xFF;
if (curid == id) {
return cap_ptr;
}
cap_ptr = (cap >> 8) & 0xFF;
}
return 0;
}
/*
* Sets other device information (device id, vendor id, etc)
*
* @dev: Device descriptor to set up.
*
* XXX: Expects device bus, slot and func to be set.
*/
static void
pci_set_device_info(struct pci_device *dev)
{
uint32_t classrev;
int capoff;
dev->vendor_id = pci_readl(dev, PCIREG_VENDOR_ID) & 0xFFFF;
dev->device_id = pci_readl(dev, PCIREG_DEVICE_ID) & 0xFFFF;
classrev = pci_readl(dev, PCIREG_CLASSREV);
dev->pci_class = PCIREG_CLASS(classrev);
dev->pci_subclass = PCIREG_SUBCLASS(classrev);
dev->prog_if = PCIREG_PROGIF(classrev);
dev->bar[0] = pci_readl(dev, PCIREG_BAR0);
dev->bar[1] = pci_readl(dev, PCIREG_BAR1);
dev->bar[2] = pci_readl(dev, PCIREG_BAR2);
dev->bar[3] = pci_readl(dev, PCIREG_BAR3);
dev->bar[4] = pci_readl(dev, PCIREG_BAR4);
dev->bar[5] = pci_readl(dev, PCIREG_BAR5);
dev->irq_line = pci_readl(dev, PCIREG_IRQLINE) & 0xFF;
capoff = pci_get_cap(dev, PCI_CAP_MSIX);
dev->msix_capoff = (capoff < 0) ? 0 : capoff;
}
/*
* Attempt to register a device.
*
* @bus: Device bus number.
* @slot: Device slot number.
* @func: Device function number.
*
* This routine also checks if the device is present
* and returns early if not.
*/
static void
pci_register_device(uint8_t bus, uint8_t slot, uint8_t func)
{
struct pci_device *dev = NULL;
if (!pci_dev_exists(bus, slot, func)) {
return;
}
dev = dynalloc(sizeof(struct pci_device));
__assert(dev != NULL);
dev->bus = bus;
dev->slot = slot;
dev->func = func;
pci_set_device_info(dev);
TAILQ_INSERT_TAIL(&device_list, dev, link);
}
static void
pci_scan_bus(uint8_t bus)
{
for (int slot = 0; slot < 32; ++slot) {
for (int func = 0; func < 8; ++func) {
pci_register_device(bus, slot, func);
}
}
}
struct pci_device *
pci_get_device(struct pci_lookup lookup, uint16_t lookup_type)
{
struct pci_device *dev;
uint16_t lookup_matches = 0;
TAILQ_FOREACH(dev, &device_list, link) {
if (ISSET(lookup_type, PCI_DEVICE_ID)) {
/* Check device ID */
if (lookup.device_id == dev->device_id)
lookup_matches |= PCI_DEVICE_ID;
}
if (ISSET(lookup_type, PCI_VENDOR_ID)) {
/* Check vendor ID */
if (lookup.vendor_id == dev->vendor_id)
lookup_matches |= PCI_VENDOR_ID;
}
if (ISSET(lookup_type, PCI_CLASS)) {
/* Check PCI class */
if (lookup.pci_class == dev->pci_class)
lookup_matches |= PCI_CLASS;
}
if (ISSET(lookup_type, PCI_SUBCLASS)) {
/* Check PCI subclass */
if (lookup.pci_subclass == dev->pci_subclass)
lookup_matches |= PCI_SUBCLASS;
}
if (lookup_type == lookup_matches) {
/* We found the device! */
return dev;
}
lookup_matches = 0;
}
return NULL;
}
int
pci_init(void)
{
TAILQ_INIT(&device_list);
pr_trace("Scanning each bus...\n");
for (uint16_t i = 0; i < 256; ++i) {
pci_scan_bus(i);
}
return 0;
}
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