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Date: Mon, 4 Jan 2016 09:29:04 +0100
From: Boris Brezillon <boris.brezillon@...e-electrons.com>
To: Milo Kim <milo.kim@...com>
Cc: <tglx@...utronix.de>, <jason@...edaemon.net>,
<marc.zyngier@....com>, <alexandre.belloni@...e-electrons.com>,
<ludovic.desroches@...el.com>, <nicolas.ferre@...el.com>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 04/19] irqchip: atmel-aic: replace magic numbers with
named constant
On Mon, 4 Jan 2016 13:28:28 +0900
Milo Kim <milo.kim@...com> wrote:
> One AIC IRQ chip can have 32 interrupt source.
> To enhance code readability, magic number is replaced with named constant,
> 'AIC_IRQS_PER_CHIP'.
>
> aic_hw_init() initializes vector registers up to total number of
> AIC interrupts. This magic number is replaced with NR_AIC_IRQS.
Actually this is a limitation of the generic chip infrastructure
(the irq_chip_generic uses u32 fields to store its internal status, and
each irq is attributed a bit position, which explains the 32 irqs per
chip limit), so I think this macro should be defined in
include/linux/irq.h:
#define MAX_IRQS_PER_GENERIC_CHIP 32
>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Jason Cooper <jason@...edaemon.net>
> Cc: Marc Zyngier <marc.zyngier@....com>
> Cc: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
> Cc: Boris BREZILLON <boris.brezillon@...e-electrons.com>
> Cc: Ludovic Desroches <ludovic.desroches@...el.com>
> Cc: Nicolas Ferre <nicolas.ferre@...el.com>
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Milo Kim <milo.kim@...com>
> ---
> drivers/irqchip/irq-atmel-aic-common.c | 11 ++++++-----
> drivers/irqchip/irq-atmel-aic-common.h | 1 +
> drivers/irqchip/irq-atmel-aic.c | 2 +-
> drivers/irqchip/irq-atmel-aic5.c | 4 ++--
> 4 files changed, 10 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/irqchip/irq-atmel-aic-common.c b/drivers/irqchip/irq-atmel-aic-common.c
> index ef2c619..5effd52 100644
> --- a/drivers/irqchip/irq-atmel-aic-common.c
> +++ b/drivers/irqchip/irq-atmel-aic-common.c
> @@ -135,7 +135,7 @@ static void __init aic_common_ext_irq_of_init(struct irq_domain *domain)
> }
>
> aic = gc->private;
> - aic->ext_irqs |= (1 << (hwirq % 32));
> + aic->ext_irqs |= (1 << (hwirq % AIC_IRQS_PER_CHIP));
> }
> }
>
> @@ -151,7 +151,7 @@ struct irq_domain *__init aic_common_of_init(struct device_node *node,
> int ret;
> int i;
>
> - nchips = DIV_ROUND_UP(nirqs, 32);
> + nchips = DIV_ROUND_UP(nirqs, AIC_IRQS_PER_CHIP);
>
> reg_base = of_iomap(node, 0);
> if (!reg_base)
> @@ -163,13 +163,14 @@ struct irq_domain *__init aic_common_of_init(struct device_node *node,
> goto err_iounmap;
> }
>
> - domain = irq_domain_add_linear(node, nchips * 32, ops, aic);
> + domain = irq_domain_add_linear(node, nchips * AIC_IRQS_PER_CHIP, ops,
> + aic);
> if (!domain) {
> ret = -ENOMEM;
> goto err_free_aic;
> }
>
> - ret = irq_alloc_domain_generic_chips(domain, 32, 1, name,
> + ret = irq_alloc_domain_generic_chips(domain, AIC_IRQS_PER_CHIP, 1, name,
> handle_fasteoi_irq,
> IRQ_NOREQUEST | IRQ_NOPROBE |
> IRQ_NOAUTOEN, 0, 0);
> @@ -177,7 +178,7 @@ struct irq_domain *__init aic_common_of_init(struct device_node *node,
> goto err_domain_remove;
>
> for (i = 0; i < nchips; i++) {
> - gc = irq_get_domain_generic_chip(domain, i * 32);
> + gc = irq_get_domain_generic_chip(domain, i * AIC_IRQS_PER_CHIP);
>
> gc->reg_base = reg_base;
>
> diff --git a/drivers/irqchip/irq-atmel-aic-common.h b/drivers/irqchip/irq-atmel-aic-common.h
> index c178557..4c0b471 100644
> --- a/drivers/irqchip/irq-atmel-aic-common.h
> +++ b/drivers/irqchip/irq-atmel-aic-common.h
> @@ -16,6 +16,7 @@
> #ifndef __IRQ_ATMEL_AIC_COMMON_H
> #define __IRQ_ATMEL_AIC_COMMON_H
>
> +#define AIC_IRQS_PER_CHIP 32
>
> int aic_common_set_type(struct irq_data *d, unsigned type, unsigned *val);
>
> diff --git a/drivers/irqchip/irq-atmel-aic.c b/drivers/irqchip/irq-atmel-aic.c
> index 6fcd680..c499949 100644
> --- a/drivers/irqchip/irq-atmel-aic.c
> +++ b/drivers/irqchip/irq-atmel-aic.c
> @@ -164,7 +164,7 @@ static void __init aic_hw_init(struct irq_domain *domain)
> irq_reg_writel(gc, 0xffffffff, AT91_AIC_IDCR);
> irq_reg_writel(gc, 0xffffffff, AT91_AIC_ICCR);
>
> - for (i = 0; i < 32; i++)
> + for (i = 0; i < NR_AIC_IRQS; i++)
> irq_reg_writel(gc, i, AT91_AIC_SVR(i));
> }
>
> diff --git a/drivers/irqchip/irq-atmel-aic5.c b/drivers/irqchip/irq-atmel-aic5.c
> index 8b8f5e2..f5848c8 100644
> --- a/drivers/irqchip/irq-atmel-aic5.c
> +++ b/drivers/irqchip/irq-atmel-aic5.c
> @@ -306,9 +306,9 @@ static int __init aic5_of_init(struct device_node *node,
> return PTR_ERR(domain);
>
> aic5_domain = domain;
> - nchips = aic5_domain->revmap_size / 32;
> + nchips = aic5_domain->revmap_size / AIC_IRQS_PER_CHIP;
> for (i = 0; i < nchips; i++) {
> - gc = irq_get_domain_generic_chip(domain, i * 32);
> + gc = irq_get_domain_generic_chip(domain, i * AIC_IRQS_PER_CHIP);
>
> gc->chip_types[0].regs.eoi = AT91_AIC5_EOICR;
> gc->chip_types[0].chip.irq_mask = aic5_mask;
--
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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