mirror of
https://github.com/torvalds/linux.git
synced 2024-12-25 12:21:37 +00:00
b633648c5a
Nobody is maintaining SMTC anymore and there also seems to be no userbase. Which is a pity - the SMTC technology primarily developed by Kevin D. Kissell <kevink@paralogos.com> is an ingenious demonstration for the MT ASE's power and elegance. Based on Markos Chandras <Markos.Chandras@imgtec.com> patch https://patchwork.linux-mips.org/patch/6719/ which while very similar did no longer apply cleanly when I tried to merge it plus some additional post-SMTC cleanup - SMTC was a feature as tricky to remove as it was to merge once upon a time. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
132 lines
3.0 KiB
C
132 lines
3.0 KiB
C
/*
|
|
* Copyright 2010 PMC-Sierra, Inc, derived from irq_cpu.c
|
|
*
|
|
* This file define the irq handler for MSP PER subsystem interrupts.
|
|
*
|
|
* 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; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/bitops.h>
|
|
|
|
#include <asm/mipsregs.h>
|
|
|
|
#include <msp_cic_int.h>
|
|
#include <msp_regs.h>
|
|
|
|
|
|
/*
|
|
* Convenience Macro. Should be somewhere generic.
|
|
*/
|
|
#define get_current_vpe() \
|
|
((read_c0_tcbind() >> TCBIND_CURVPE_SHIFT) & TCBIND_CURVPE)
|
|
|
|
#ifdef CONFIG_SMP
|
|
/*
|
|
* The PER registers must be protected from concurrent access.
|
|
*/
|
|
|
|
static DEFINE_SPINLOCK(per_lock);
|
|
#endif
|
|
|
|
/* ensure writes to per are completed */
|
|
|
|
static inline void per_wmb(void)
|
|
{
|
|
const volatile void __iomem *per_mem = PER_INT_MSK_REG;
|
|
volatile u32 dummy_read;
|
|
|
|
wmb();
|
|
dummy_read = __raw_readl(per_mem);
|
|
dummy_read++;
|
|
}
|
|
|
|
static inline void unmask_per_irq(struct irq_data *d)
|
|
{
|
|
#ifdef CONFIG_SMP
|
|
unsigned long flags;
|
|
spin_lock_irqsave(&per_lock, flags);
|
|
*PER_INT_MSK_REG |= (1 << (d->irq - MSP_PER_INTBASE));
|
|
spin_unlock_irqrestore(&per_lock, flags);
|
|
#else
|
|
*PER_INT_MSK_REG |= (1 << (d->irq - MSP_PER_INTBASE));
|
|
#endif
|
|
per_wmb();
|
|
}
|
|
|
|
static inline void mask_per_irq(struct irq_data *d)
|
|
{
|
|
#ifdef CONFIG_SMP
|
|
unsigned long flags;
|
|
spin_lock_irqsave(&per_lock, flags);
|
|
*PER_INT_MSK_REG &= ~(1 << (d->irq - MSP_PER_INTBASE));
|
|
spin_unlock_irqrestore(&per_lock, flags);
|
|
#else
|
|
*PER_INT_MSK_REG &= ~(1 << (d->irq - MSP_PER_INTBASE));
|
|
#endif
|
|
per_wmb();
|
|
}
|
|
|
|
static inline void msp_per_irq_ack(struct irq_data *d)
|
|
{
|
|
mask_per_irq(d);
|
|
/*
|
|
* In the PER interrupt controller, only bits 11 and 10
|
|
* are write-to-clear, (SPI TX complete, SPI RX complete).
|
|
* It does nothing for any others.
|
|
*/
|
|
*PER_INT_STS_REG = (1 << (d->irq - MSP_PER_INTBASE));
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
static int msp_per_irq_set_affinity(struct irq_data *d,
|
|
const struct cpumask *affinity, bool force)
|
|
{
|
|
/* WTF is this doing ????? */
|
|
unmask_per_irq(d);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static struct irq_chip msp_per_irq_controller = {
|
|
.name = "MSP_PER",
|
|
.irq_enable = unmask_per_irq,
|
|
.irq_disable = mask_per_irq,
|
|
.irq_ack = msp_per_irq_ack,
|
|
#ifdef CONFIG_SMP
|
|
.irq_set_affinity = msp_per_irq_set_affinity,
|
|
#endif
|
|
};
|
|
|
|
void __init msp_per_irq_init(void)
|
|
{
|
|
int i;
|
|
/* Mask/clear interrupts. */
|
|
*PER_INT_MSK_REG = 0x00000000;
|
|
*PER_INT_STS_REG = 0xFFFFFFFF;
|
|
/* initialize all the IRQ descriptors */
|
|
for (i = MSP_PER_INTBASE; i < MSP_PER_INTBASE + 32; i++) {
|
|
irq_set_chip(i, &msp_per_irq_controller);
|
|
}
|
|
}
|
|
|
|
void msp_per_irq_dispatch(void)
|
|
{
|
|
u32 per_mask = *PER_INT_MSK_REG;
|
|
u32 per_status = *PER_INT_STS_REG;
|
|
u32 pending;
|
|
|
|
pending = per_status & per_mask;
|
|
if (pending) {
|
|
do_IRQ(ffs(pending) + MSP_PER_INTBASE - 1);
|
|
} else {
|
|
spurious_interrupt();
|
|
}
|
|
}
|