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