linux-kernel - Re: [RFC][PATCH 01/10] arm: mxc: New interrupt controller (TZIC) for i.MX5 family

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Date:	Fri, 4 Dec 2009 09:01:39 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Amit Kucheria <amit.kucheria@...onical.com>
Cc:	List Linux Kernel <linux-kernel@...r.kernel.org>,
	linux-arm-kernel@...ts.infradead.org, s.hauer@...gutronix.de,
	valentin.longchamp@...l.ch, daniel@...aq.de,
	grant.likely@...retlab.ca, Dinh.Nguyen@...escale.com,
	r.herring@...escale.com
Subject: Re: [RFC][PATCH 01/10] arm: mxc: New interrupt controller (TZIC)
 for i.MX5 family

On Fri,  4 Dec 2009 04:47:01 +0200 Amit Kucheria wrote:

> Freescale i.MX51 processor uses a different interrupt controller. Add the
> driver and fix the Makefile to account for it.
> 
> Signed-off-by: Amit Kucheria <amit.kucheria@...onical.com>
> ---
>  arch/arm/plat-mxc/Kconfig  |    4 +
>  arch/arm/plat-mxc/Makefile |    9 ++-
>  arch/arm/plat-mxc/tzic.c   |  180 ++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 192 insertions(+), 1 deletions(-)
>  create mode 100644 arch/arm/plat-mxc/tzic.c
> 
> diff --git a/arch/arm/plat-mxc/tzic.c b/arch/arm/plat-mxc/tzic.c
> new file mode 100644
> index 0000000..3af8fc6
> --- /dev/null
> +++ b/arch/arm/plat-mxc/tzic.c
> @@ -0,0 +1,180 @@
> +/*
> + * Copyright 2004-2009 Freescale Semiconductor, Inc. All Rights Reserved.
> + *
> + * The code contained herein is licensed under the GNU General Public
> + * License. You may obtain a copy of the GNU General Public License
> + * Version 2 or later at the following locations:
> + *
> + * http://www.opensource.org/licenses/gpl-license.html
> + * http://www.gnu.org/copyleft/gpl.html
> + */
> +
...
> +
> +/*!
> + * Disable interrupt number "irq" in the TZIC
> + *
> + * @param  irq          interrupt source number
> + */

Hi,
What processes these function comments (if anything does)?


> +static void mxc_mask_irq(unsigned int irq)
> +{
> +	int index, off;
> +
> +	index = irq >> 5;
> +	off = irq & 0x1F;
> +	__raw_writel(1 << off, tzic_base + TZIC_ENCLEAR0 + (index << 2));
> +}
> +
> +/*!
> + * Enable interrupt number "irq" in the TZIC
> + *
> + * @param  irq          interrupt source number
> + */
> +static void mxc_unmask_irq(unsigned int irq)
> +{
> +	int index, off;
> +
> +	index = irq >> 5;
> +	off = irq & 0x1F;
> +	__raw_writel(1 << off, tzic_base + TZIC_ENSET0 + (index << 2));
> +}
> +
> +static unsigned int wakeup_intr[4];
> +
> +/*
> + * Set interrupt number "irq" in the TZIC as a wake-up source.
> + *
> + * @param  irq          interrupt source number
> + * @param  enable       enable as wake-up if equal to non-zero
> + * 			disble as wake-up if equal to zero
> + *
> + * @return       This function returns 0 on success.
> + */
> +static int mxc_set_wake_irq(unsigned int irq, unsigned int enable)
> +{
> +	unsigned int index, off;
> +
> +	index = irq >> 5;
> +	off = irq & 0x1F;
> +
> +	if (index > 3)
> +		return -1;
> +
> +	if (enable)
> +		wakeup_intr[index] |= (1 << off);
> +	else
> +		wakeup_intr[index] &= ~(1 << off);
> +
> +	return 0;
> +}
> +
> +static struct irq_chip mxc_tzic_chip = {
> +	.name = "MXC_TZIC",
> +	.ack = mxc_mask_irq,
> +	.mask = mxc_mask_irq,
> +	.unmask = mxc_unmask_irq,
> +	.set_wake = mxc_set_wake_irq,
> +};
> +
...
> +
> +/*
> + * enable wakeup interrupt
> + *
> + * @param is_idle		1 if called in idle loop (enset registers);
> + *				0 to be used when called from low power entry
> + * @return			0 if successful; non-zero otherwise
> + *
> + */
> +int tzic_enable_wake(int is_idle)
> +{
> +	unsigned int i, v;
> +
> +	__raw_writel(1, tzic_base + TZIC_DSMINT);
> +	if (unlikely(__raw_readl(tzic_base + TZIC_DSMINT) == 0))
> +		return -EAGAIN;
> +
> +	if (likely(is_idle)) {
> +		for (i = 0; i < 4; i++) {
> +			v = __raw_readl(tzic_base + TZIC_ENSET0 + i * 4);
> +			__raw_writel(v, tzic_base + TZIC_WAKEUP0 + i * 4);
> +		}
> +	} else {
> +		for (i = 0; i < 4; i++) {
> +			v = wakeup_intr[i];
> +			__raw_writel(v, tzic_base + TZIC_WAKEUP0 + i * 4);
> +		}
> +	}
> +	return 0;
> +}
> -- 

thanks,
---
~Randy
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