[PATCH v8 5/9] ARM: irqchip: mxs: add Alpascale ASM9260 support

[shawn.guo@linaro.org (Shawn Guo)]

Thanks Jason for pointing me the thread.

On Tue, Oct 21, 2014 at 12:40:16PM +0200, Oleksij Rempel wrote:
> Freescale iMX23/iMX28 and Alphascale ASM9260 have similar
> interrupt collectors. It makes easy to reuse irq-mxs code for ASM9260.
> Differences between this devices are fallowing:
> - different register offsets
> - different count of intterupt lines per register
> - ASM9260 don't provide reset bit
> - ASM9260 don't support FIQ.
> 
> Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
> ---
>  drivers/irqchip/Kconfig                    |   9 +++
>  drivers/irqchip/Makefile                   |   2 +-
>  drivers/irqchip/alphascale_asm9260-icoll.h | 109 +++++++++++++++++++++++++++++
>  drivers/irqchip/irq-mxs.c                  | 105 ++++++++++++++++++++++++---
>  4 files changed, 216 insertions(+), 9 deletions(-)
>  create mode 100644 drivers/irqchip/alphascale_asm9260-icoll.h
> 
> diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
> index b8632bf..10470cb 100644
> --- a/drivers/irqchip/Kconfig
> +++ b/drivers/irqchip/Kconfig
> @@ -113,3 +113,12 @@ config IRQ_CROSSBAR
>  	  The primary irqchip invokes the crossbar's callback which inturn allocates
>  	  a free irq and configures the IP. Thus the peripheral interrupts are
>  	  routed to one of the free irqchip interrupt lines.
> +
> +config IRQ_MXS
> +	bool "MXS interrupt controller"
> +	select IRQ_DOMAIN
> +	select STMP_DEVICE
> +	default y if MACH_ASM9260 || CONFIG_ARCH_MXS

s/CONFIG_ARCH_MXS/ARCH_MXS

Even with this change, the 'default y' doesn't seem to work for me.

> +	help
> +	  Support for interrupt controller present in Freescale iMX23/iMX28 and
> +	  Alphascale ASM9260 SoCs.

...

> diff --git a/drivers/irqchip/irq-mxs.c b/drivers/irqchip/irq-mxs.c
> index 681125d..8c5c3d2 100644
> --- a/drivers/irqchip/irq-mxs.c
> +++ b/drivers/irqchip/irq-mxs.c
> @@ -1,5 +1,7 @@
>  /*
>   * Copyright (C) 2009-2010 Freescale Semiconductor, Inc. All Rights Reserved.
> + * Copyright (C) 2014 Oleksij Rempel <linux@rempel-privat.de>
> + *	Add Alphascale ASM9260 support.
>   *
>   * This program is free software; you can redistribute it and/or modify
>   * it under the terms of the GNU General Public License as published by
> @@ -28,6 +30,7 @@
>  #include <asm/exception.h>
>  
>  #include "irqchip.h"
> +#include "alphascale_asm9260-icoll.h"
>  
>  /*
>   * this device provide 4 offsets for each register:
> @@ -63,6 +66,33 @@ struct icoll_priv {
>  
>  static struct icoll_priv icoll_priv;
>  static struct irq_domain *icoll_domain;
> +static DEFINE_RAW_SPINLOCK(icoll_lock);
> +
> +/* calculate bit offset depending on number of intterupt per register */
> +static u32 icoll_intr_bitshift(struct irq_data *d, u32 bit)
> +{
> +	/*
> +	 * We expect intr_per_reg to be 4 or 1, it means
> +	 * "n" will be 3 or 0.
> +	 */
> +	int n = icoll_priv.intr_per_reg - 1;
> +
> +	/*
> +	 * If n = 0, "bit" is never shifted.
> +	 * If n = 3, mask lower part of hwirq to convert it
> +	 * in 0, 1, 2 or 3 and then multiply it by 8 (or shift by 3)
> +	 */
> +	return bit << ((d->hwirq & n) << n);
> +}
> +
> +/* calculate mem offset depending on number of intterupt per register */
> +static void __iomem *icoll_intr_reg(struct irq_data *d)
> +{
> +	int n = icoll_priv.intr_per_reg >> 1;
> +
> +	/* offset = hwirq / intr_per_reg * 0x10 */
> +	return icoll_priv.intr + ((d->hwirq >> n) * 0x10);
> +}
>  
>  static void icoll_ack_irq(struct irq_data *d)
>  {
> @@ -77,14 +107,21 @@ static void icoll_ack_irq(struct irq_data *d)
>  
>  static void icoll_mask_irq(struct irq_data *d)
>  {
> -	__raw_writel(BM_ICOLL_INTR_ENABLE,
> -			icoll_priv.intr + CLR_REG + HW_ICOLL_INTERRUPTn(d->hwirq));
> +	__raw_writel(icoll_intr_bitshift(d, BM_ICOLL_INTR_ENABLE),
> +			icoll_intr_reg(d) + CLR_REG);
>  }
>  
>  static void icoll_unmask_irq(struct irq_data *d)
>  {
> -	__raw_writel(BM_ICOLL_INTR_ENABLE,
> -			icoll_priv.intr + SET_REG + HW_ICOLL_INTERRUPTn(d->hwirq));
> +	raw_spin_lock(&icoll_lock);
> +	if (icoll_priv.clear)
> +		__raw_writel(ASM9260_BM_CLEAR_BIT(d->hwirq),
> +				icoll_priv.clear +
> +				ASM9260_HW_ICOLL_CLEARn(d->hwirq));
> +
> +	__raw_writel(icoll_intr_bitshift(d, BM_ICOLL_INTR_ENABLE),
> +			icoll_intr_reg(d) + SET_REG);
> +	raw_spin_unlock(&icoll_lock);
>  }
>  
>  static struct irq_chip mxs_icoll_chip = {
> @@ -116,12 +153,34 @@ static struct irq_domain_ops icoll_irq_domain_ops = {
>  	.xlate = irq_domain_xlate_onecell,
>  };
>  
> +static void __init icoll_add_domain(struct device_node *np,
> +			  int num)
> +{
> +	icoll_domain = irq_domain_add_linear(np, num,
> +					     &icoll_irq_domain_ops, NULL);
> +
> +	if (!icoll_domain)
> +		panic("%s: unable add irq domain", np->full_name);
> +	irq_set_default_host(icoll_domain);
> +	set_handle_irq(icoll_handle_irq);
> +}
> +
> +static void __iomem * __init icoll_init_iobase(struct device_node *np)
> +{
> +	void __iomem *icoll_base;
> +
> +	icoll_base = of_io_request_and_map(np, 0, np->name);

  LD      kernel/built-in.o
../drivers/irqchip/irq-mxs.c: In function ?icoll_init_iobase?:
../drivers/irqchip/irq-mxs.c:172:2: warning: passing argument 3 of ?of_io_request_and_map? discards ?const? qualifier from pointer target type [enabled by default]
In file included from ../drivers/irqchip/irq-mxs.c:27:0:
../include/linux/of_address.h:108:15: note: expected ?char *? but argument is of type ?const char *?

Shawn

> +	if (!icoll_base)
> +		panic("%s: unable to map resource", np->full_name);
> +	return icoll_base;
> +}
> +
>  static int __init icoll_of_init(struct device_node *np,
>  			  struct device_node *interrupt_parent)
>  {
> -	void __iomem *icoll_base = of_iomap(np, 0);
> -	WARN_ON(!icoll_base);
> +	void __iomem *icoll_base;
>  
> +	icoll_base		= icoll_init_iobase(np);
>  	icoll_priv.vector	= icoll_base + HW_ICOLL_VECTOR;
>  	icoll_priv.levelack	= icoll_base + HW_ICOLL_LEVELACK;
>  	icoll_priv.ctrl		= icoll_base + HW_ICOLL_CTRL;
> @@ -136,8 +195,38 @@ static int __init icoll_of_init(struct device_node *np,
>  	 */
>  	stmp_reset_block(icoll_priv.ctrl);
>  
> -	icoll_domain = irq_domain_add_linear(np, ICOLL_NUM_IRQS,
> -					     &icoll_irq_domain_ops, NULL);
> +	icoll_add_domain(np, ICOLL_NUM_IRQS);
> +
>  	return icoll_domain ? 0 : -ENODEV;
>  }
>  IRQCHIP_DECLARE(mxs, "fsl,icoll", icoll_of_init);
> +
> +static int __init asm9260_of_init(struct device_node *np,
> +			  struct device_node *interrupt_parent)
> +{
> +	void __iomem *icoll_base;
> +	int i;
> +
> +	icoll_base = icoll_init_iobase(np);
> +	icoll_priv.vector	= icoll_base + ASM9260_HW_ICOLL_VECTOR;
> +	icoll_priv.levelack	= icoll_base + ASM9260_HW_ICOLL_LEVELACK;
> +	icoll_priv.ctrl		= icoll_base + ASM9260_HW_ICOLL_CTRL;
> +	icoll_priv.stat		= icoll_base + ASM9260_HW_ICOLL_STAT_OFFSET;
> +	icoll_priv.intr		= icoll_base + ASM9260_HW_ICOLL_INTERRUPT0;
> +	icoll_priv.intr_per_reg	= 4;
> +	icoll_priv.clear	= icoll_base + ASM9260_HW_ICOLL_CLEAR0;
> +
> +	writel_relaxed(ASM9260_BM_CTRL_IRQ_ENABLE,
> +			icoll_priv.ctrl);
> +	/*
> +	 * ASM9260 don't provide reset bit. So, we need to set level 0
> +	 * manually.
> +	 */
> +	for (i = 0; i < 16 * 0x10; i += 0x10)
> +		writel(0, icoll_priv.intr + i);
> +
> +	icoll_add_domain(np, ASM9260_NUM_IRQS);
> +
> +	return icoll_domain ? 0 : -ENODEV;
> +}
> +IRQCHIP_DECLARE(asm9260, "alphascale,asm9260-icoll", asm9260_of_init);
> -- 
> 1.9.1
> 
> 
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