diff options
Diffstat (limited to 'arch/powerpc/sysdev/fsl_mpic_err.c')
| -rw-r--r-- | arch/powerpc/sysdev/fsl_mpic_err.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/fsl_mpic_err.c b/arch/powerpc/sysdev/fsl_mpic_err.c new file mode 100644 index 000000000000..b83f32562a37 --- /dev/null +++ b/arch/powerpc/sysdev/fsl_mpic_err.c @@ -0,0 +1,149 @@ +/* + * 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 == NO_IRQ); + if (cascade_irq != NO_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 == NO_IRQ) { + 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"); +} |