linux-kernel - Re: [PATCH 06/19] irqchip: atmel-aic: introduce register data structure

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Message-ID: <20160104095309.4a613aab@bbrezillon>
Date:	Mon, 4 Jan 2016 09:53:09 +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 06/19] irqchip: atmel-aic: introduce register data
 structure

On Mon, 4 Jan 2016 13:28:30 +0900
Milo Kim <milo.kim@...com> wrote:

> Structure, 'aic_reg_offset' describes for device specific register offset.
> Each offset is used for IRQ chip operation. AIC and AIC5 have different
> register values, but the structure can be shared.
> 
> Please note that this is not complete patch, it's a preceding step for
> making unified AIC driver.
> 
> 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 | 91 ++++++++++++++++++++++++++++++++++
>  1 file changed, 91 insertions(+)
> 
> diff --git a/drivers/irqchip/irq-atmel-aic-common.c b/drivers/irqchip/irq-atmel-aic-common.c
> index 5effd52..f840165 100644
> --- a/drivers/irqchip/irq-atmel-aic-common.c
> +++ b/drivers/irqchip/irq-atmel-aic-common.c
> @@ -24,6 +24,32 @@
>  
>  #include "irq-atmel-aic-common.h"
>  
> +#define AT91_AIC_SMR_BASE		0
> +#define AT91_AIC_SVR_BASE		0x80
> +#define AT91_AIC_IVR			0x100
> +#define AT91_AIC_ISR			0x108
> +#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
> +#define AT91_INVALID_OFFSET		(-1)
> +
> +#define AT91_AIC5_SSR			0x0
> +#define AT91_AIC5_SMR			0x4
> +#define AT91_AIC5_SVR			0x8
> +#define AT91_AIC5_IVR			0x10
> +#define AT91_AIC5_ISR			0x18
> +#define AT91_AIC5_EOICR			0x38
> +#define AT91_AIC5_SPU			0x3c
> +#define AT91_AIC5_IECR			0x40
> +#define AT91_AIC5_IDCR			0x44
> +#define AT91_AIC5_ICCR			0x48
> +#define AT91_AIC5_ISCR			0x4c
> +#define AT91_AIC5_DCR			0x6c
> +
>  #define AT91_AIC_PRIOR			GENMASK(2, 0)
>  #define AT91_AIC_IRQ_MIN_PRIORITY	0
>  #define AT91_AIC_IRQ_MAX_PRIORITY	7
> @@ -38,6 +64,71 @@ struct aic_chip_data {
>  	u32 ext_irqs;
>  };
>  
> +/**
> + * struct aic_reg_offset
> + *
> + * @eoi:	End of interrupt command register
> + * @smr:	Source mode register
> + * @ssr:	Source select register
> + * @iscr:	Interrupt set command register
> + * @idcr:	Interrupt disable command register
> + * @iccr:	Interrupt clear command register
> + * @iecr:	Interrupt enable command register
> + * @spu:	Spurious interrupt vector register
> + * @dcr:	Debug control register
> + * @svr:	Source vector register
> + * @ivr:	Interrupt vector register
> + * @isr:	Interrupt status register
> + *
> + * Each value means register offset.
> + */
> +struct aic_reg_offset {
> +	int eoi;
> +	int smr;
> +	int ssr;
> +	int iscr;
> +	int idcr;
> +	int iccr;
> +	int iecr;
> +	int spu;
> +	int dcr;
> +	int svr;
> +	int ivr;
> +	int isr;
> +};
> +
> +static const struct aic_reg_offset aic_regs = {
> +	.eoi	= AT91_AIC_EOICR,
> +	.smr	= AT91_AIC_SMR_BASE,
> +	.ssr	= AT91_INVALID_OFFSET,	/* No SSR exists */
> +	.iscr	= AT91_AIC_ISCR,
> +	.idcr	= AT91_AIC_IDCR,
> +	.iccr	= AT91_AIC_ICCR,
> +	.iecr	= AT91_AIC_IECR,
> +	.spu	= AT91_AIC_SPU,
> +	.dcr	= AT91_AIC_DCR,
> +	.svr	= AT91_AIC_SVR_BASE,
> +	.ivr	= AT91_AIC_IVR,
> +	.isr	= AT91_AIC_ISR,
> +};
> +
> +static const struct aic_reg_offset aic5_regs = {
> +	.eoi	= AT91_AIC5_EOICR,
> +	.smr	= AT91_AIC5_SMR,
> +	.ssr	= AT91_AIC5_SSR,
> +	.iscr	= AT91_AIC5_ISCR,
> +	.idcr	= AT91_AIC5_IDCR,
> +	.iccr	= AT91_AIC5_ICCR,
> +	.iecr	= AT91_AIC5_IECR,
> +	.spu	= AT91_AIC5_SPU,
> +	.dcr	= AT91_AIC5_DCR,
> +	.svr	= AT91_AIC5_SVR,
> +	.ivr	= AT91_AIC5_IVR,
> +	.isr	= AT91_AIC5_ISR,
> +};
> +
> +static const struct aic_reg_offset *aic_reg_data;
> +

Can we avoid adding this global variable: this information can probably
be added to the aic_chip_data struct.

>  static void aic_common_shutdown(struct irq_data *d)
>  {
>  	struct irq_chip_type *ct = irq_data_get_chip_type(d);



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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