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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
*/
#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
* @link_num: number of PIRQ links supported
* @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
* @actl_8bit: ACTL register width is 8-bit (for ICH series chipset)
* @actl_addr: ACTL register offset
*/
struct irq_router {
int config;
u32 link_base;
int link_num;
u16 irq_mask;
u32 bdf;
u32 ibase;
bool actl_8bit;
int actl_addr;
};
struct pirq_routing {
int bdf;
int pin;
int pirq;
};
/**
* pirq_reg_to_linkno() - Convert a PIRQ routing register offset to link number
*
* @reg: PIRQ routing register offset from the base address
* @base: PIRQ routing register block base address
* @return: PIRQ link number (0 for PIRQA, 1 for PIRQB, etc)
*/
static inline int pirq_reg_to_linkno(int reg, int base)
{
return reg - base;
}
/**
* pirq_linkno_to_reg() - Convert a PIRQ link number to routing register offset
*
* @linkno: PIRQ link number (0 for PIRQA, 1 for PIRQB, etc)
* @base: PIRQ routing register block base address
* @return: PIRQ routing register offset from the base address
*/
static inline int pirq_linkno_to_reg(int linkno, int base)
{
return linkno + base;
}
#define PIRQ_BITMAP 0xdef8
#endif /* _ARCH_IRQ_H_ */
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