150 lines
3.6 KiB
C
150 lines
3.6 KiB
C
/*
|
|
* Copyright (C) 2012 Freescale Semiconductor, Inc.
|
|
*
|
|
* Author: Varun Sethi <varun.sethi@freescale.com>
|
|
*
|
|
* 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.
|
|
*
|
|
*/
|
|
|
|
#include <linux/irq.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/interrupt.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/mpic.h>
|
|
|
|
#include "mpic.h"
|
|
|
|
#define MPIC_ERR_INT_BASE 0x3900
|
|
#define MPIC_ERR_INT_EISR 0x0000
|
|
#define MPIC_ERR_INT_EIMR 0x0010
|
|
|
|
static inline u32 mpic_fsl_err_read(u32 __iomem *base, unsigned int err_reg)
|
|
{
|
|
return in_be32(base + (err_reg >> 2));
|
|
}
|
|
|
|
static inline void mpic_fsl_err_write(u32 __iomem *base, u32 value)
|
|
{
|
|
out_be32(base + (MPIC_ERR_INT_EIMR >> 2), value);
|
|
}
|
|
|
|
static void fsl_mpic_mask_err(struct irq_data *d)
|
|
{
|
|
u32 eimr;
|
|
struct mpic *mpic = irq_data_get_irq_chip_data(d);
|
|
unsigned int src = virq_to_hw(d->irq) - mpic->err_int_vecs[0];
|
|
|
|
eimr = mpic_fsl_err_read(mpic->err_regs, MPIC_ERR_INT_EIMR);
|
|
eimr |= (1 << (31 - src));
|
|
mpic_fsl_err_write(mpic->err_regs, eimr);
|
|
}
|
|
|
|
static void fsl_mpic_unmask_err(struct irq_data *d)
|
|
{
|
|
u32 eimr;
|
|
struct mpic *mpic = irq_data_get_irq_chip_data(d);
|
|
unsigned int src = virq_to_hw(d->irq) - mpic->err_int_vecs[0];
|
|
|
|
eimr = mpic_fsl_err_read(mpic->err_regs, MPIC_ERR_INT_EIMR);
|
|
eimr &= ~(1 << (31 - src));
|
|
mpic_fsl_err_write(mpic->err_regs, eimr);
|
|
}
|
|
|
|
static struct irq_chip fsl_mpic_err_chip = {
|
|
.irq_disable = fsl_mpic_mask_err,
|
|
.irq_mask = fsl_mpic_mask_err,
|
|
.irq_unmask = fsl_mpic_unmask_err,
|
|
};
|
|
|
|
int mpic_setup_error_int(struct mpic *mpic, int intvec)
|
|
{
|
|
int i;
|
|
|
|
mpic->err_regs = ioremap(mpic->paddr + MPIC_ERR_INT_BASE, 0x1000);
|
|
if (!mpic->err_regs) {
|
|
pr_err("could not map mpic error registers\n");
|
|
return -ENOMEM;
|
|
}
|
|
mpic->hc_err = fsl_mpic_err_chip;
|
|
mpic->hc_err.name = mpic->name;
|
|
mpic->flags |= MPIC_FSL_HAS_EIMR;
|
|
/* allocate interrupt vectors for error interrupts */
|
|
for (i = MPIC_MAX_ERR - 1; i >= 0; i--)
|
|
mpic->err_int_vecs[i] = --intvec;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int mpic_map_error_int(struct mpic *mpic, unsigned int virq, irq_hw_number_t hw)
|
|
{
|
|
if ((mpic->flags & MPIC_FSL_HAS_EIMR) &&
|
|
(hw >= mpic->err_int_vecs[0] &&
|
|
hw <= mpic->err_int_vecs[MPIC_MAX_ERR - 1])) {
|
|
WARN_ON(mpic->flags & MPIC_SECONDARY);
|
|
|
|
pr_debug("mpic: mapping as Error Interrupt\n");
|
|
irq_set_chip_data(virq, mpic);
|
|
irq_set_chip_and_handler(virq, &mpic->hc_err,
|
|
handle_level_irq);
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static irqreturn_t fsl_error_int_handler(int irq, void *data)
|
|
{
|
|
struct mpic *mpic = (struct mpic *) data;
|
|
u32 eisr, eimr;
|
|
int errint;
|
|
unsigned int cascade_irq;
|
|
|
|
eisr = mpic_fsl_err_read(mpic->err_regs, MPIC_ERR_INT_EISR);
|
|
eimr = mpic_fsl_err_read(mpic->err_regs, MPIC_ERR_INT_EIMR);
|
|
|
|
if (!(eisr & ~eimr))
|
|
return IRQ_NONE;
|
|
|
|
while (eisr) {
|
|
errint = __builtin_clz(eisr);
|
|
cascade_irq = irq_linear_revmap(mpic->irqhost,
|
|
mpic->err_int_vecs[errint]);
|
|
WARN_ON(!cascade_irq);
|
|
if (cascade_irq) {
|
|
generic_handle_irq(cascade_irq);
|
|
} else {
|
|
eimr |= 1 << (31 - errint);
|
|
mpic_fsl_err_write(mpic->err_regs, eimr);
|
|
}
|
|
eisr &= ~(1 << (31 - errint));
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
void mpic_err_int_init(struct mpic *mpic, irq_hw_number_t irqnum)
|
|
{
|
|
unsigned int virq;
|
|
int ret;
|
|
|
|
virq = irq_create_mapping(mpic->irqhost, irqnum);
|
|
if (!virq) {
|
|
pr_err("Error interrupt setup failed\n");
|
|
return;
|
|
}
|
|
|
|
/* Mask all error interrupts */
|
|
mpic_fsl_err_write(mpic->err_regs, ~0);
|
|
|
|
ret = request_irq(virq, fsl_error_int_handler, IRQF_NO_THREAD,
|
|
"mpic-error-int", mpic);
|
|
if (ret)
|
|
pr_err("Failed to register error interrupt handler\n");
|
|
}
|