linux-kernel - Re: [PATCH 05/11] mfd: flexcard: add interrupt support

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Message-ID: <20150330084657.GP457@x1>
Date:	Mon, 30 Mar 2015 09:46:57 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Holger Dengler <dengler@...utronix.de>
Cc:	linux-kernel@...r.kernel.org, Peter Mahler <mahler@...ug.com>,
	Juergen Bubeck <bubeck@...ug.com>,
	Benedikt Spranger <b.spranger@...utronix.de>,
	Samuel Ortiz <sameo@...ux.intel.com>
Subject: Re: [PATCH 05/11] mfd: flexcard: add interrupt support

On Wed, 25 Mar 2015, Holger Dengler wrote:

> From: Benedikt Spranger <b.spranger@...utronix.de>
> 
> The Flexcard comprise an interrupt controller for the attached
> tinys, timer, a Flexray related trigger and a second one for DMA.
> Both controllers share a single IRQ line.
> 
> Add an interrupt domain for the non-DMA interrupts.
> 
> Signed-off-by: Holger Dengler <dengler@...utronix.de>
> Signed-off-by: Benedikt Spranger <b.spranger@...utronix.de>
> cc: Samuel Ortiz <sameo@...ux.intel.com>
> cc: Lee Jones <lee.jones@...aro.org>
> ---
>  drivers/mfd/Kconfig             |   1 +
>  drivers/mfd/flexcard/Makefile   |   2 +-
>  drivers/mfd/flexcard/core.c     |  14 +++-
>  drivers/mfd/flexcard/flexcard.h |   2 +
>  drivers/mfd/flexcard/irq.c      | 167 ++++++++++++++++++++++++++++++++++++++++
>  drivers/mfd/flexcard/irq.h      |  50 ++++++++++++
>  include/linux/mfd/flexcard.h    |   2 +
>  7 files changed, 235 insertions(+), 3 deletions(-)
>  create mode 100644 drivers/mfd/flexcard/irq.c
>  create mode 100644 drivers/mfd/flexcard/irq.h

[...]

> diff --git a/drivers/mfd/flexcard/irq.h b/drivers/mfd/flexcard/irq.h
> new file mode 100644
> index 0000000..b18fb5b
> --- /dev/null
> +++ b/drivers/mfd/flexcard/irq.h
> @@ -0,0 +1,50 @@
> +#ifndef FLEXCARD_IRQ_H
> +#define FLEXCARD_IRQ_H
> +
> +struct flexcard_irq_tab {
> +	u32 enable;
> +	u32 reset;
> +	u32 status;
> +};
> +
> +#define to_irq_tab(e, s) {			\
> +	.enable = (1 << e),			\
> +	.status = (1 << s),			\
> +}
> +
> +#define to_irq_tab_ack(e, r, s) {		\
> +	.enable = (1 << e),			\
> +	.reset  = (1 << r),			\
> +	.status = (1 << s),			\
> +}
> +
> +/*
> + * Interrupt Controller Register S-Box
> + * unlike other irq controllers the FlexCard bits for enable, reset and status
> + * looks more like a cryptographic S-box. Make a const table to have a more
> + * easier access to this bits in the irqchip callback functions.
> + * The table contains the registers for PMC2-cards.
> + */
> +static const struct flexcard_irq_tab flexcard_irq_tab[] = {
> +	to_irq_tab_ack(28, 0, 28),	/* TIMER  */
> +	to_irq_tab_ack(29, 1, 29),	/* CC1CYS */
> +	to_irq_tab_ack(30, 10, 21),	/* CC2CYS */
> +	to_irq_tab_ack(18, 2, 30),	/* CC3CYS */
> +	to_irq_tab_ack(19, 6, 25),	/* CC4CYS */
> +	to_irq_tab_ack(26, 4, 26),	/* WAKE1A */
> +	to_irq_tab_ack(27, 5, 27),	/* WAKE1B */
> +	to_irq_tab_ack(24, 8, 23),	/* WAKE2A */
> +	to_irq_tab_ack(25, 9, 22),	/* WAKE2B */
> +	to_irq_tab_ack(22, 12, 19),	/* WAKE3A */
> +	to_irq_tab_ack(23, 13, 18),	/* WAKE3B */
> +	to_irq_tab_ack(20, 14, 17),	/* WAKE4A */
> +	to_irq_tab_ack(21, 15, 16),	/* WAKE4B */
> +	to_irq_tab(15, 31),		/* CC1T0  */
> +	to_irq_tab(14, 3),		/* CC2T0  */
> +	to_irq_tab(16, 24),		/* CC3T0  */
> +	to_irq_tab(17, 20),		/* CC4T0  */
> +};
> +
> +#define NR_FLEXCARD_IRQ		ARRAY_SIZE(flexcard_irq_tab)

Is everything in this header used over multiple source files, or only
irq.c?  If the latter, then please move them into irq.c.

> +#endif /* FLEXCARD_IRQ_H */
> diff --git a/include/linux/mfd/flexcard.h b/include/linux/mfd/flexcard.h
> index 84e155c..f5b789f 100644
> --- a/include/linux/mfd/flexcard.h
> +++ b/include/linux/mfd/flexcard.h
> @@ -22,12 +22,14 @@
>  #define FLEXCARD_MAX_NAME	16
>  
>  struct flexcard_device {
> +	raw_spinlock_t irq_lock;
>  	struct pci_dev *pdev;
>  	struct fc_conf_bar __iomem *conf;
>  	struct mfd_cell *cells;
>  	struct resource *res;
>  	struct miscdevice dev;
>  	struct kref ref;
> +	struct irq_domain *irq_domain;
>  	int cardnr;
>  	char name[FLEXCARD_MAX_NAME];
>  };

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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