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