[PATCH v2 02/10] irqchip: add irqchip driver for nuc900

[Jason Cooper]

Hi Wan Zongshun,

On Sun, Jul 10, 2016 at 03:27:22PM +0800, Wan Zongshun wrote:
> This patch is to add irqchip driver support for nuc900 plat,
> current this driver only supports nuc970 SoC.
> 
> Signed-off-by: Wan Zongshun <mcuos.com at gmail.com>
> ---
>  arch/arm/mach-w90x900/include/mach/irqs.h |   5 +
>  drivers/irqchip/Makefile                  |   1 +
>  drivers/irqchip/irq-nuc900.c              | 150 ++++++++++++++++++++++++++++++
>  3 files changed, 156 insertions(+)
>  create mode 100644 drivers/irqchip/irq-nuc900.c
> 
> diff --git a/arch/arm/mach-w90x900/include/mach/irqs.h b/arch/arm/mach-w90x900/include/mach/irqs.h
> index 9d5cba3..3b035c6 100644
> --- a/arch/arm/mach-w90x900/include/mach/irqs.h
> +++ b/arch/arm/mach-w90x900/include/mach/irqs.h
> @@ -59,7 +59,12 @@
>  #define IRQ_KPI		W90X900_IRQ(29)
>  #define IRQ_P2SGROUP	W90X900_IRQ(30)
>  #define IRQ_ADC		W90X900_IRQ(31)
> +
> +#if !defined(CONFIG_SOC_NUC900)
>  #define NR_IRQS		(IRQ_ADC+1)
> +#else
> +#define NR_IRQS		62
> +#endif

Arnd already covered this...

>  
>  /*for irq group*/
>  
> diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
> index 38853a1..9ccd5af8a 100644
> --- a/drivers/irqchip/Makefile
> +++ b/drivers/irqchip/Makefile
> @@ -69,3 +69,4 @@ obj-$(CONFIG_PIC32_EVIC)		+= irq-pic32-evic.o
>  obj-$(CONFIG_MVEBU_ODMI)		+= irq-mvebu-odmi.o
>  obj-$(CONFIG_LS_SCFG_MSI)		+= irq-ls-scfg-msi.o
>  obj-$(CONFIG_EZNPS_GIC)			+= irq-eznps.o
> +obj-$(CONFIG_SOC_NUC970)		+= irq-nuc900.o
> diff --git a/drivers/irqchip/irq-nuc900.c b/drivers/irqchip/irq-nuc900.c
> new file mode 100644
> index 0000000..c4b2e39
> --- /dev/null
> +++ b/drivers/irqchip/irq-nuc900.c
> @@ -0,0 +1,150 @@
> +/*
> + * Copyright 2016 Wan Zongshun <mcuos.com at gmail.com>
> + *
> + * 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
> + */
> +
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/irq.h>
> +#include <linux/irqchip.h>
> +#include <linux/irqdomain.h>
> +#include <linux/io.h>
> +#include <linux/ioport.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
> +
> +#include <asm/exception.h>
> +#include <asm/hardirq.h>
> +
> +#define	REG_AIC_SCR1	0x00
> +#define	REG_AIC_SCR2	0x04
> +#define	REG_AIC_SCR3	0x08
> +#define	REG_AIC_SCR4	0x0C
> +#define	REG_AIC_SCR5	0x10
> +#define	REG_AIC_SCR6	0x14
> +#define	REG_AIC_SCR7	0x18
> +#define	REG_AIC_SCR8	0x1C
> +#define	REG_AIC_SCR9	0x20
> +#define	REG_AIC_SCR10	0x24
> +#define	REG_AIC_SCR11	0x28
> +#define	REG_AIC_SCR12	0x2C
> +#define	REG_AIC_SCR13	0x30
> +#define	REG_AIC_SCR14	0x34
> +#define	REG_AIC_SCR15	0x38
> +#define	REG_AIC_IRSR	0x100
> +#define	REG_AIC_IRSRH	0x104
> +#define	REG_AIC_IASR	0x108
> +#define	REG_AIC_IASRH	0x10C
> +#define	REG_AIC_ISR	0x110
> +#define	REG_AIC_ISRH	0x114
> +#define	REG_AIC_IPER	0x118
> +#define	REG_AIC_ISNR	0x120
> +#define	REG_AIC_OISR	0x124
> +#define	REG_AIC_IMR	0x128
> +#define	REG_AIC_IMRH	0x12C
> +#define	REG_AIC_MECR	0x130
> +#define	REG_AIC_MECRH	0x134
> +#define	REG_AIC_MDCR	0x138
> +#define	REG_AIC_MDCRH	0x13C
> +#define	REG_AIC_SSCR	0x140
> +#define	REG_AIC_SSCRH	0x144
> +#define	REG_AIC_SCCR	0x148
> +#define	REG_AIC_SCCRH	0x14C
> +#define	REG_AIC_EOSCR	0x150

Please remove unused defines.

> +
> +static void __iomem *aic_base;
> +static struct irq_domain *aic_domain;
> +
> +static void nuc900_irq_mask(struct irq_data *d)
> +{
> +	if (d->irq < 32)
> +		writel(1 << (d->irq), aic_base + REG_AIC_MDCR);
> +	else
> +		writel(1 << (d->irq - 32), aic_base + REG_AIC_MDCRH);
> +}
> +
> +static void nuc900_irq_ack(struct irq_data *d)
> +{
> +	writel(0x01, aic_base + REG_AIC_EOSCR);
> +}
> +
> +static void nuc900_irq_unmask(struct irq_data *d)
> +{
> +	if (d->irq < 32)
> +		writel(1 << (d->irq), aic_base + REG_AIC_MECR);
> +	else
> +		writel(1 << (d->irq - 32), aic_base + REG_AIC_MECRH);
> +}
> +
> +static struct irq_chip nuc900_irq_chip = {
> +	.irq_ack	= nuc900_irq_ack,
> +	.irq_mask	= nuc900_irq_mask,
> +	.irq_unmask	= nuc900_irq_unmask,
> +};
> +
> +void __exception_irq_entry aic_handle_irq(struct pt_regs *regs)
> +{
> +	u32 hwirq;
> +
> +	hwirq = readl(aic_base + REG_AIC_IPER);
> +	hwirq = readl(aic_base + REG_AIC_ISNR);
> +	if (!hwirq)
> +		writel(0x01, aic_base + REG_AIC_EOSCR);

Could you explain what's going on here?

> +
> +	handle_IRQ((irq_find_mapping(aic_domain, hwirq)), regs);
> +}
> +
> +static int aic_irq_domain_map(struct irq_domain *d, unsigned int virq,
> +			      irq_hw_number_t hw)
> +{
> +	irq_set_chip_and_handler(virq, &nuc900_irq_chip, handle_level_irq);
> +	irq_clear_status_flags(virq, IRQ_NOREQUEST);
> +
> +	return 0;
> +}
> +
> +static struct irq_domain_ops aic_irq_domain_ops = {
> +	.map = aic_irq_domain_map,
> +	.xlate = irq_domain_xlate_onecell,
> +};
> +
> +static int __init aic_of_init(struct device_node *node,
> +			      struct device_node *parent)
> +{
> +	int ret;
> +
> +	aic_base = of_iomap(node, 0);
> +	if (!aic_base) {
> +		ret = -ENOMEM;
> +		pr_err("%s: unable to map registers\n", node->full_name);
> +		goto err_iomap;
> +	}
> +
> +	writel(0xFFFFFFFC, aic_base + REG_AIC_MDCR);
> +	writel(0xFFFFFFFF, aic_base + REG_AIC_MDCRH);
> +
> +	aic_domain = irq_domain_add_linear(node, NR_IRQS,
> +					   &aic_irq_domain_ops, NULL);
> +
> +	if (!aic_domain) {
> +		ret = -ENOMEM;
> +		pr_err("%s: unable to create IRQ domain\n", node->full_name);
> +		goto err_aic_domain;
> +	}
> +
> +	set_handle_irq(aic_handle_irq);
> +	return 0;
> +
> +err_aic_domain:
> +	iounmap(aic_base);
> +err_iomap:
> +	return ret;
> +}
> +
> +IRQCHIP_DECLARE(nuc900, "nuvoton,nuc900-aic", aic_of_init);

afaict, there is no 'nuc900', that's a family.  If so, this compatible
needs to be 'nuvoton,nuc970-aic'.

thx,

Jason.