135 lines
3.5 KiB
C
135 lines
3.5 KiB
C
/*
|
|
* Copyright 2011-2012, Meador Inge, Mentor Graphics Corporation.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; version 2 of the
|
|
* License.
|
|
*
|
|
*/
|
|
|
|
#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
|