From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- arch/x86/include/asm/i8259.h | 83 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) create mode 100644 arch/x86/include/asm/i8259.h (limited to 'arch/x86/include/asm/i8259.h') diff --git a/arch/x86/include/asm/i8259.h b/arch/x86/include/asm/i8259.h new file mode 100644 index 000000000..89789e8c8 --- /dev/null +++ b/arch/x86/include/asm/i8259.h @@ -0,0 +1,83 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_X86_I8259_H +#define _ASM_X86_I8259_H + +#include +#include + +extern unsigned int cached_irq_mask; + +#define __byte(x, y) (((unsigned char *)&(y))[x]) +#define cached_master_mask (__byte(0, cached_irq_mask)) +#define cached_slave_mask (__byte(1, cached_irq_mask)) + +/* i8259A PIC registers */ +#define PIC_MASTER_CMD 0x20 +#define PIC_MASTER_IMR 0x21 +#define PIC_MASTER_ISR PIC_MASTER_CMD +#define PIC_MASTER_POLL PIC_MASTER_ISR +#define PIC_MASTER_OCW3 PIC_MASTER_ISR +#define PIC_SLAVE_CMD 0xa0 +#define PIC_SLAVE_IMR 0xa1 + +/* i8259A PIC related value */ +#define PIC_CASCADE_IR 2 +#define MASTER_ICW4_DEFAULT 0x01 +#define SLAVE_ICW4_DEFAULT 0x01 +#define PIC_ICW4_AEOI 2 + +extern raw_spinlock_t i8259A_lock; + +/* the PIC may need a careful delay on some platforms, hence specific calls */ +static inline unsigned char inb_pic(unsigned int port) +{ + unsigned char value = inb(port); + + /* + * delay for some accesses to PIC on motherboard or in chipset + * must be at least one microsecond, so be safe here: + */ + udelay(2); + + return value; +} + +static inline void outb_pic(unsigned char value, unsigned int port) +{ + outb(value, port); + /* + * delay for some accesses to PIC on motherboard or in chipset + * must be at least one microsecond, so be safe here: + */ + udelay(2); +} + +extern struct irq_chip i8259A_chip; + +struct legacy_pic { + int nr_legacy_irqs; + struct irq_chip *chip; + void (*mask)(unsigned int irq); + void (*unmask)(unsigned int irq); + void (*mask_all)(void); + void (*restore_mask)(void); + void (*init)(int auto_eoi); + int (*probe)(void); + int (*irq_pending)(unsigned int irq); + void (*make_irq)(unsigned int irq); +}; + +extern struct legacy_pic *legacy_pic; +extern struct legacy_pic null_legacy_pic; + +static inline bool has_legacy_pic(void) +{ + return legacy_pic != &null_legacy_pic; +} + +static inline int nr_legacy_irqs(void) +{ + return legacy_pic->nr_legacy_irqs; +} + +#endif /* _ASM_X86_I8259_H */ -- cgit v1.2.3