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/*
* Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef _ARCH_IRQ_H_
#define _ARCH_IRQ_H_
#include <dt-bindings/interrupt-router/intel-irq.h>
/**
* Intel interrupt router configuration mechanism
*
* There are two known ways of Intel interrupt router configuration mechanism
* so far. On most cases, the IRQ routing configuraiton is controlled by PCI
* configuraiton registers on the legacy bridge, normally PCI BDF(0, 31, 0).
* On some newer platforms like BayTrail and Braswell, the IRQ routing is now
* in the IBASE register block where IBASE is memory-mapped.
*/
enum pirq_config {
PIRQ_VIA_PCI,
PIRQ_VIA_IBASE
};
/**
* Intel interrupt router control block
*
* Its members' value will be filled in based on device tree's input.
*
* @config: PIRQ_VIA_PCI or PIRQ_VIA_IBASE
* @link_base: link value base number
* @irq_mask: IRQ mask reprenting the 16 IRQs in 8259, bit N is 1 means
* IRQ N is available to be routed
* @lb_bdf: irq router's PCI bus/device/function number encoding
* @ibase: IBASE register block base address
*/
struct irq_router {
int config;
u32 link_base;
u16 irq_mask;
u32 bdf;
u32 ibase;
};
struct pirq_routing {
int bdf;
int pin;
int pirq;
};
/* PIRQ link number and value conversion */
#define LINK_V2N(link, base) (link - base)
#define LINK_N2V(link, base) (link + base)
#define PIRQ_BITMAP 0xdef8
/**
* cpu_irq_init() - Initialize CPU IRQ routing
*
* This initializes some platform-specific registers related to IRQ routing,
* like configuring internal PCI devices to use which PCI interrupt pin,
* and which PCI interrupt pin is mapped to which PIRQ line. Note on some
* platforms, such IRQ routing might be hard-coded thus cannot configure.
*/
void cpu_irq_init(void);
/**
* pirq_init() - Initialize platform PIRQ routing
*
* This initializes the PIRQ routing on the platform and configures all PCI
* devices' interrupt line register to a working IRQ number on the 8259 PIC.
*
* @return 0 if OK, -ve on error
*/
int pirq_init(void);
#endif /* _ARCH_IRQ_H_ */
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