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linux/drivers/irqchip/irq-atmel-aic.c
Mark Rutland 0953fb2637 irq: remove handle_domain_{irq,nmi}() 
Now that entry code handles IRQ entry (including setting the IRQ regs)
before calling irqchip code, irqchip code can safely call
generic_handle_domain_irq(), and there's no functional reason for it to
call handle_domain_irq().

Let's cement this split of responsibility and remove handle_domain_irq()
entirely, updating irqchip drivers to call generic_handle_domain_irq().

For consistency, handle_domain_nmi() is similarly removed and replaced
with a generic_handle_domain_nmi() function which also does not perform
any entry logic.

Previously handle_domain_{irq,nmi}() had a WARN_ON() which would fire
when they were called in an inappropriate context. So that we can
identify similar issues going forward, similar WARN_ON_ONCE() logic is
added to the generic_handle_*() functions, and comments are updated for
clarity and consistency.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
2021-10-26 10:13:31 +01:00

275 lines
7.1 KiB
C
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/*
* Atmel AT91 AIC (Advanced Interrupt Controller) driver
*
* Copyright (C) 2004 SAN People
* Copyright (C) 2004 ATMEL
* Copyright (C) Rick Bronson
* Copyright (C) 2014 Free Electrons
*
* Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/bitmap.h>
#include <linux/types.h>
#include <linux/irq.h>
#include <linux/irqchip.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/irqdomain.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <asm/exception.h>
#include <asm/mach/irq.h>
#include "irq-atmel-aic-common.h"
/* Number of irq lines managed by AIC */
#define NR_AIC_IRQS 32
#define AT91_AIC_SMR(n) ((n) * 4)
#define AT91_AIC_SVR(n) (0x80 + ((n) * 4))
#define AT91_AIC_IVR 0x100
#define AT91_AIC_FVR 0x104
#define AT91_AIC_ISR 0x108
#define AT91_AIC_IPR 0x10c
#define AT91_AIC_IMR 0x110
#define AT91_AIC_CISR 0x114
#define AT91_AIC_IECR 0x120
#define AT91_AIC_IDCR 0x124
#define AT91_AIC_ICCR 0x128
#define AT91_AIC_ISCR 0x12c
#define AT91_AIC_EOICR 0x130
#define AT91_AIC_SPU 0x134
#define AT91_AIC_DCR 0x138
static struct irq_domain *aic_domain;
static asmlinkage void __exception_irq_entry
aic_handle(struct pt_regs *regs)
{
struct irq_domain_chip_generic *dgc = aic_domain->gc;
struct irq_chip_generic *gc = dgc->gc[0];
u32 irqnr;
u32 irqstat;
irqnr = irq_reg_readl(gc, AT91_AIC_IVR);
irqstat = irq_reg_readl(gc, AT91_AIC_ISR);
if (!irqstat)
irq_reg_writel(gc, 0, AT91_AIC_EOICR);
else
generic_handle_domain_irq(aic_domain, irqnr);
}
static int aic_retrigger(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
/* Enable interrupt on AIC5 */
irq_gc_lock(gc);
irq_reg_writel(gc, d->mask, AT91_AIC_ISCR);
irq_gc_unlock(gc);
return 1;
}
static int aic_set_type(struct irq_data *d, unsigned type)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
unsigned int smr;
int ret;
smr = irq_reg_readl(gc, AT91_AIC_SMR(d->hwirq));
ret = aic_common_set_type(d, type, &smr);
if (ret)
return ret;
irq_reg_writel(gc, smr, AT91_AIC_SMR(d->hwirq));
return 0;
}
#ifdef CONFIG_PM
static void aic_suspend(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
irq_gc_lock(gc);
irq_reg_writel(gc, gc->mask_cache, AT91_AIC_IDCR);
irq_reg_writel(gc, gc->wake_active, AT91_AIC_IECR);
irq_gc_unlock(gc);
}
static void aic_resume(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
irq_gc_lock(gc);
irq_reg_writel(gc, gc->wake_active, AT91_AIC_IDCR);
irq_reg_writel(gc, gc->mask_cache, AT91_AIC_IECR);
irq_gc_unlock(gc);
}
static void aic_pm_shutdown(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
irq_gc_lock(gc);
irq_reg_writel(gc, 0xffffffff, AT91_AIC_IDCR);
irq_reg_writel(gc, 0xffffffff, AT91_AIC_ICCR);
irq_gc_unlock(gc);
}
#else
#define aic_suspend NULL
#define aic_resume NULL
#define aic_pm_shutdown NULL
#endif /* CONFIG_PM */
static void __init aic_hw_init(struct irq_domain *domain)
{
struct irq_chip_generic *gc = irq_get_domain_generic_chip(domain, 0);
int i;
/*
* Perform 8 End Of Interrupt Command to make sure AIC
* will not Lock out nIRQ
*/
for (i = 0; i < 8; i++)
irq_reg_writel(gc, 0, AT91_AIC_EOICR);
/*
* Spurious Interrupt ID in Spurious Vector Register.
* When there is no current interrupt, the IRQ Vector Register
* reads the value stored in AIC_SPU
*/
irq_reg_writel(gc, 0xffffffff, AT91_AIC_SPU);
/* No debugging in AIC: Debug (Protect) Control Register */
irq_reg_writel(gc, 0, AT91_AIC_DCR);
/* Disable and clear all interrupts initially */
irq_reg_writel(gc, 0xffffffff, AT91_AIC_IDCR);
irq_reg_writel(gc, 0xffffffff, AT91_AIC_ICCR);
for (i = 0; i < 32; i++)
irq_reg_writel(gc, i, AT91_AIC_SVR(i));
}
static int aic_irq_domain_xlate(struct irq_domain *d,
struct device_node *ctrlr,
const u32 *intspec, unsigned int intsize,
irq_hw_number_t *out_hwirq,
unsigned int *out_type)
{
struct irq_domain_chip_generic *dgc = d->gc;
struct irq_chip_generic *gc;
unsigned long flags;
unsigned smr;
int idx;
int ret;
if (!dgc)
return -EINVAL;
ret = aic_common_irq_domain_xlate(d, ctrlr, intspec, intsize,
out_hwirq, out_type);
if (ret)
return ret;
idx = intspec[0] / dgc->irqs_per_chip;
if (idx >= dgc->num_chips)
return -EINVAL;
gc = dgc->gc[idx];
irq_gc_lock_irqsave(gc, flags);
smr = irq_reg_readl(gc, AT91_AIC_SMR(*out_hwirq));
aic_common_set_priority(intspec[2], &smr);
irq_reg_writel(gc, smr, AT91_AIC_SMR(*out_hwirq));
irq_gc_unlock_irqrestore(gc, flags);
return ret;
}
static const struct irq_domain_ops aic_irq_ops = {
.map = irq_map_generic_chip,
.xlate = aic_irq_domain_xlate,
};
static void __init at91rm9200_aic_irq_fixup(void)
{
aic_common_rtc_irq_fixup();
}
static void __init at91sam9260_aic_irq_fixup(void)
{
aic_common_rtt_irq_fixup();
}
static void __init at91sam9g45_aic_irq_fixup(void)
{
aic_common_rtc_irq_fixup();
aic_common_rtt_irq_fixup();
}
static const struct of_device_id aic_irq_fixups[] __initconst = {
{ .compatible = "atmel,at91rm9200", .data = at91rm9200_aic_irq_fixup },
{ .compatible = "atmel,at91sam9g45", .data = at91sam9g45_aic_irq_fixup },
{ .compatible = "atmel,at91sam9n12", .data = at91rm9200_aic_irq_fixup },
{ .compatible = "atmel,at91sam9rl", .data = at91sam9g45_aic_irq_fixup },
{ .compatible = "atmel,at91sam9x5", .data = at91rm9200_aic_irq_fixup },
{ .compatible = "atmel,at91sam9260", .data = at91sam9260_aic_irq_fixup },
{ .compatible = "atmel,at91sam9261", .data = at91sam9260_aic_irq_fixup },
{ .compatible = "atmel,at91sam9263", .data = at91sam9260_aic_irq_fixup },
{ .compatible = "atmel,at91sam9g20", .data = at91sam9260_aic_irq_fixup },
{ /* sentinel */ },
};
static int __init aic_of_init(struct device_node *node,
struct device_node *parent)
{
struct irq_chip_generic *gc;
struct irq_domain *domain;
if (aic_domain)
return -EEXIST;
domain = aic_common_of_init(node, &aic_irq_ops, "atmel-aic",
NR_AIC_IRQS, aic_irq_fixups);
if (IS_ERR(domain))
return PTR_ERR(domain);
aic_domain = domain;
gc = irq_get_domain_generic_chip(domain, 0);
gc->chip_types[0].regs.eoi = AT91_AIC_EOICR;
gc->chip_types[0].regs.enable = AT91_AIC_IECR;
gc->chip_types[0].regs.disable = AT91_AIC_IDCR;
gc->chip_types[0].chip.irq_mask = irq_gc_mask_disable_reg;
gc->chip_types[0].chip.irq_unmask = irq_gc_unmask_enable_reg;
gc->chip_types[0].chip.irq_retrigger = aic_retrigger;
gc->chip_types[0].chip.irq_set_type = aic_set_type;
gc->chip_types[0].chip.irq_suspend = aic_suspend;
gc->chip_types[0].chip.irq_resume = aic_resume;
gc->chip_types[0].chip.irq_pm_shutdown = aic_pm_shutdown;
aic_hw_init(domain);
set_handle_irq(aic_handle);
return 0;
}
IRQCHIP_DECLARE(at91rm9200_aic, "atmel,at91rm9200-aic", aic_of_init);
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