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/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2022-11-07 GuEe-GUI first version
*/
#include <rtthread.h>
#define DBG_TAG "pci.irq"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
#include <drivers/pci.h>
void rt_pci_assign_irq(struct rt_pci_device *pdev)
{
int irq = 0;
rt_uint8_t pin, slot = -1;
struct rt_pci_host_bridge *host_bridge = rt_pci_find_host_bridge(pdev->bus);
if (!host_bridge->irq_map)
{
LOG_D("PCI-Device<%s> runtime IRQ mapping not provided by platform",
rt_dm_dev_get_name(&pdev->parent));
return;
}
/* Must try the swizzle when interrupt line passes through a P2P bridge */
rt_pci_read_config_u8(pdev, PCIR_INTPIN, &pin);
if (pin > RT_PCI_INTX_PIN_MAX)
{
pin = 1;
}
if (pin)
{
if (host_bridge->irq_slot)
{
slot = host_bridge->irq_slot(pdev, &pin);
}
/* Map IRQ */
if ((irq = host_bridge->irq_map(pdev, slot, pin)) == -1)
{
irq = 0;
}
}
pdev->irq = irq;
LOG_D("PCI-Device<%s> assign IRQ: got %d", rt_dm_dev_get_name(&pdev->parent), pdev->irq);
/* Save IRQ */
rt_pci_write_config_u8(pdev, PCIR_INTLINE, irq);
}
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