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usr
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linux-headers-6.8.0-36-generic
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arch
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include
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asm
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mpic_msgr.h
/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright 2011-2012, Meador Inge, Mentor Graphics Corporation. */ #ifndef _ASM_MPIC_MSGR_H #define _ASM_MPIC_MSGR_H #include <linux/types.h> #include <linux/spinlock.h> #include <asm/smp.h> #include <asm/io.h> struct mpic_msgr { u32 __iomem *base; u32 __iomem *mer; int irq; unsigned char in_use; raw_spinlock_t lock; int num; }; /* Get a message register * * @reg_num: the MPIC message register to get * * A pointer to the message register is returned. If * the message register asked for is already in use, then * EBUSY is returned. If the number given is not associated * with an actual message register, then ENODEV is returned. * Successfully getting the register marks it as in use. */ extern struct mpic_msgr *mpic_msgr_get(unsigned int reg_num); /* Relinquish a message register * * @msgr: the message register to return * * Disables the given message register and marks it as free. * After this call has completed successully the message * register is available to be acquired by a call to * mpic_msgr_get. */ extern void mpic_msgr_put(struct mpic_msgr *msgr); /* Enable a message register * * @msgr: the message register to enable * * The given message register is enabled for sending * messages. */ extern void mpic_msgr_enable(struct mpic_msgr *msgr); /* Disable a message register * * @msgr: the message register to disable * * The given message register is disabled for sending * messages. */ extern void mpic_msgr_disable(struct mpic_msgr *msgr); /* Write a message to a message register * * @msgr: the message register to write to * @message: the message to write * * The given 32-bit message is written to the given message * register. Writing to an enabled message registers fires * an interrupt. */ static inline void mpic_msgr_write(struct mpic_msgr *msgr, u32 message) { out_be32(msgr->base, message); } /* Read a message from a message register * * @msgr: the message register to read from * * Returns the 32-bit value currently in the given message register. * Upon reading the register any interrupts for that register are * cleared. */ static inline u32 mpic_msgr_read(struct mpic_msgr *msgr) { return in_be32(msgr->base); } /* Clear a message register * * @msgr: the message register to clear * * Clears any interrupts associated with the given message register. */ static inline void mpic_msgr_clear(struct mpic_msgr *msgr) { (void) mpic_msgr_read(msgr); } /* Set the destination CPU for the message register * * @msgr: the message register whose destination is to be set * @cpu_num: the Linux CPU number to bind the message register to * * Note that the CPU number given is the CPU number used by the kernel * and *not* the actual hardware CPU number. */ static inline void mpic_msgr_set_destination(struct mpic_msgr *msgr, u32 cpu_num) { out_be32(msgr->base, 1 << get_hard_smp_processor_id(cpu_num)); } /* Get the IRQ number for the message register * @msgr: the message register whose IRQ is to be returned * * Returns the IRQ number associated with the given message register. * 0 is returned if this message register is not capable of receiving * interrupts. What message register can and cannot receive interrupts is * specified in the device tree for the system. */ static inline int mpic_msgr_get_irq(struct mpic_msgr *msgr) { return msgr->irq; } #endif
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