[RFC PATCH 16/19] powerpc: wii: hollywood interrupt controller support
Albert Herranz
albert_herranz at yahoo.es
Tue Nov 24 07:18:51 EST 2009
Grant Likely wrote:
> On Sun, Nov 22, 2009 at 3:01 PM, Albert Herranz <albert_herranz at yahoo.es> wrote:
>> Add support for the dual interrupt controller included in the "Hollywood"
>> chipset of the Nintendo Wii video game console.
>> This interrupt controller serves both the Broadway processor (as a cascade)
>> and the Starlet processor, and is used to manage interrupts for the
>> non-classic hardware.
>>
>> Signed-off-by: Albert Herranz <albert_herranz at yahoo.es>
>
> On brief glance...
>
> Acked-by: Grant Likely <grant.likely at secretlab.ca>
>
Uhmmm... I think I should use .name instead of .typename in struct irq_chip, no?
>> ---
>> arch/powerpc/platforms/embedded6xx/Kconfig | 5 +
>> arch/powerpc/platforms/embedded6xx/Makefile | 1 +
>> arch/powerpc/platforms/embedded6xx/hlwd-pic.c | 238 +++++++++++++++++++++++++
>> arch/powerpc/platforms/embedded6xx/hlwd-pic.h | 22 +++
>> 4 files changed, 266 insertions(+), 0 deletions(-)
>> create mode 100644 arch/powerpc/platforms/embedded6xx/hlwd-pic.c
>> create mode 100644 arch/powerpc/platforms/embedded6xx/hlwd-pic.h
>>
>> diff --git a/arch/powerpc/platforms/embedded6xx/Kconfig b/arch/powerpc/platforms/embedded6xx/Kconfig
>> index efb2ea1..490f89e 100644
>> --- a/arch/powerpc/platforms/embedded6xx/Kconfig
>> +++ b/arch/powerpc/platforms/embedded6xx/Kconfig
>> @@ -122,3 +122,8 @@ config GAMECUBE
>> Select GAMECUBE if configuring for the Nintendo GameCube.
>> More information at: <http://gc-linux.sourceforge.net/>
>>
>> +config HLWD_PIC
>> + bool
>> + depends on STARLET_MINI
>> + default y
>> +
>> diff --git a/arch/powerpc/platforms/embedded6xx/Makefile b/arch/powerpc/platforms/embedded6xx/Makefile
>> index b0324ed..c1dcc54 100644
>> --- a/arch/powerpc/platforms/embedded6xx/Makefile
>> +++ b/arch/powerpc/platforms/embedded6xx/Makefile
>> @@ -10,3 +10,4 @@ obj-$(CONFIG_PPC_C2K) += c2k.o
>> obj-$(CONFIG_USBGECKO_UDBG) += usbgecko_udbg.o
>> obj-$(CONFIG_FLIPPER_PIC) += flipper-pic.o
>> obj-$(CONFIG_GAMECUBE) += gamecube.o gamecube_dev.o
>> +obj-$(CONFIG_HLWD_PIC) += hlwd-pic.o
>> diff --git a/arch/powerpc/platforms/embedded6xx/hlwd-pic.c b/arch/powerpc/platforms/embedded6xx/hlwd-pic.c
>> new file mode 100644
>> index 0000000..b024800
>> --- /dev/null
>> +++ b/arch/powerpc/platforms/embedded6xx/hlwd-pic.c
>> @@ -0,0 +1,238 @@
>> +/*
>> + * arch/powerpc/platforms/embedded6xx/hlwd-pic.c
>> + *
>> + * Nintendo Wii "Hollywood" interrupt controller support.
>> + * Copyright (C) 2009 The GameCube Linux Team
>> + * Copyright (C) 2009 Albert Herranz
>> + *
>> + * 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 the Free Software Foundation; either version 2
>> + * of the License, or (at your option) any later version.
>> + *
>> + */
>> +#define DRV_MODULE_NAME "hlwd-pic"
>> +#define pr_fmt(fmt) DRV_MODULE_NAME ": " fmt
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/init.h>
>> +#include <linux/irq.h>
>> +#include <linux/of.h>
>> +#include <asm/io.h>
>> +
>> +#include "hlwd-pic.h"
>> +
>> +#define HLWD_NR_IRQS 32
>> +
>> +/*
>> + * Each interrupt has a corresponding bit in both
>> + * the Interrupt Cause (ICR) and Interrupt Mask (IMR) registers.
>> + *
>> + * Enabling/disabling an interrupt line involves asserting/clearing
>> + * the corresponding bit in IMR. ACK'ing a request simply involves
>> + * asserting the corresponding bit in ICR.
>> + */
>> +#define HW_BROADWAY_ICR 0x00
>> +#define HW_BROADWAY_IMR 0x04
>> +
>> +
>> +/*
>> + * IRQ chip hooks.
>> + *
>> + */
>> +
>> +static void hlwd_pic_mask_and_ack(unsigned int virq)
>> +{
>> + int irq = virq_to_hw(virq);
>> + void __iomem *io_base = get_irq_chip_data(virq);
>> +
>> + clear_bit(irq, io_base + HW_BROADWAY_IMR);
>> + set_bit(irq, io_base + HW_BROADWAY_ICR);
>> +}
>> +
>> +static void hlwd_pic_ack(unsigned int virq)
>> +{
>> + int irq = virq_to_hw(virq);
>> + void __iomem *io_base = get_irq_chip_data(virq);
>> +
>> + set_bit(irq, io_base + HW_BROADWAY_ICR);
>> +}
>> +
>> +static void hlwd_pic_mask(unsigned int virq)
>> +{
>> + int irq = virq_to_hw(virq);
>> + void __iomem *io_base = get_irq_chip_data(virq);
>> +
>> + clear_bit(irq, io_base + HW_BROADWAY_IMR);
>> +}
>> +
>> +static void hlwd_pic_unmask(unsigned int virq)
>> +{
>> + int irq = virq_to_hw(virq);
>> + void __iomem *io_base = get_irq_chip_data(virq);
>> +
>> + set_bit(irq, io_base + HW_BROADWAY_IMR);
>> +}
>> +
>> +
>> +static struct irq_chip hlwd_pic = {
>> + .typename = "hlwd-pic",
>> + .ack = hlwd_pic_ack,
>> + .mask_ack = hlwd_pic_mask_and_ack,
>> + .mask = hlwd_pic_mask,
>> + .unmask = hlwd_pic_unmask,
>> +};
>> +
>> +/*
>> + * IRQ host hooks.
>> + *
>> + */
>> +
>> +static struct irq_host *hlwd_irq_host;
>> +
>> +static int hlwd_pic_map(struct irq_host *h, unsigned int virq,
>> + irq_hw_number_t hwirq)
>> +{
>> + set_irq_chip_data(virq, h->host_data);
>> + get_irq_desc(virq)->status |= IRQ_LEVEL;
>> + set_irq_chip_and_handler(virq, &hlwd_pic, handle_level_irq);
>> + return 0;
>> +}
>> +
>> +static void hlwd_pic_unmap(struct irq_host *h, unsigned int irq)
>> +{
>> + set_irq_chip_data(irq, NULL);
>> + set_irq_chip(irq, NULL);
>> +}
>> +
>> +static struct irq_host_ops hlwd_irq_host_ops = {
>> + .map = hlwd_pic_map,
>> + .unmap = hlwd_pic_unmap,
>> +};
>> +
>> +static unsigned int __hlwd_pic_get_irq(struct irq_host *h)
>> +{
>> + void __iomem *io_base = h->host_data;
>> + int irq;
>> + u32 irq_status;
>> +
>> + irq_status = in_be32(io_base + HW_BROADWAY_ICR) &
>> + in_be32(io_base + HW_BROADWAY_IMR);
>> + if (irq_status == 0)
>> + return NO_IRQ_IGNORE; /* no more IRQs pending */
>> +
>> + __asm__ __volatile__("cntlzw %0,%1" : "=r"(irq) : "r"(irq_status));
>> + return irq_linear_revmap(h, 31 - irq);
>> +}
>> +
>> +static void hlwd_pic_irq_cascade(unsigned int cascade_virq,
>> + struct irq_desc *desc)
>> +{
>> + struct irq_host *irq_host = get_irq_data(cascade_virq);
>> + unsigned int virq;
>> +
>> + spin_lock(&desc->lock);
>> + desc->chip->mask(cascade_virq); /* IRQ_LEVEL */
>> + spin_unlock(&desc->lock);
>> +
>> + virq = __hlwd_pic_get_irq(irq_host);
>> + if (virq != NO_IRQ_IGNORE)
>> + generic_handle_irq(virq);
>> + else
>> + pr_err("spurious interrupt!\n");
>> +
>> + spin_lock(&desc->lock);
>> + desc->chip->ack(cascade_virq); /* IRQ_LEVEL */
>> + if (!(desc->status & IRQ_DISABLED) && desc->chip->unmask)
>> + desc->chip->unmask(cascade_virq);
>> + spin_unlock(&desc->lock);
>> +}
>> +
>> +/*
>> + * Platform hooks.
>> + *
>> + */
>> +
>> +static void __hlwd_quiesce(void __iomem *io_base)
>> +{
>> + /* mask and ack all IRQs */
>> + out_be32(io_base + HW_BROADWAY_IMR, 0);
>> + out_be32(io_base + HW_BROADWAY_ICR, ~0);
>> +}
>> +
>> +struct irq_host *hlwd_pic_init(struct device_node *np)
>> +{
>> + struct irq_host *irq_host;
>> + struct resource res;
>> + void __iomem *io_base;
>> + int retval;
>> +
>> + retval = of_address_to_resource(np, 0, &res);
>> + if (retval) {
>> + pr_err("no io memory range found\n");
>> + return NULL;
>> + }
>> + io_base = ioremap(res.start, resource_size(&res));
>> + if (!io_base) {
>> + pr_err("ioremap failed\n");
>> + return NULL;
>> + }
>> +
>> + pr_info("controller at 0x%08x mapped to 0x%p\n", res.start, io_base);
>> +
>> + __hlwd_quiesce(io_base);
>> +
>> + irq_host = irq_alloc_host(np, IRQ_HOST_MAP_LINEAR, HLWD_NR_IRQS,
>> + &hlwd_irq_host_ops, NO_IRQ_IGNORE);
>> + if (!irq_host) {
>> + pr_err("failed to allocate irq_host\n");
>> + return NULL;
>> + }
>> + irq_host->host_data = io_base;
>> +
>> + return irq_host;
>> +}
>> +
>> +unsigned int hlwd_pic_get_irq(void)
>> +{
>> + return __hlwd_pic_get_irq(hlwd_irq_host);
>> +}
>> +
>> +/*
>> + * Probe function.
>> + *
>> + */
>> +
>> +void hlwd_pic_probe(void)
>> +{
>> + struct irq_host *host;
>> + struct device_node *np;
>> + const u32 *interrupts;
>> + int cascade_virq;
>> +
>> + for_each_compatible_node(np, NULL, "nintendo,hollywood-pic") {
>> + interrupts = of_get_property(np, "interrupts", NULL);
>> + if (interrupts) {
>> + host = hlwd_pic_init(np);
>> + BUG_ON(!host);
>> + cascade_virq = irq_of_parse_and_map(np, 0);
>> + set_irq_data(cascade_virq, host);
>> + set_irq_chained_handler(cascade_virq,
>> + hlwd_pic_irq_cascade);
>> + }
>> + }
>> +}
>> +
>> +/**
>> + * hlwd_quiesce() - quiesce hollywood irq controller
>> + *
>> + * Mask and ack all interrupt sources.
>> + *
>> + */
>> +void hlwd_quiesce(void)
>> +{
>> + void __iomem *io_base = hlwd_irq_host->host_data;
>> +
>> + __hlwd_quiesce(io_base);
>> +}
>> +
>> diff --git a/arch/powerpc/platforms/embedded6xx/hlwd-pic.h b/arch/powerpc/platforms/embedded6xx/hlwd-pic.h
>> new file mode 100644
>> index 0000000..d2e5a09
>> --- /dev/null
>> +++ b/arch/powerpc/platforms/embedded6xx/hlwd-pic.h
>> @@ -0,0 +1,22 @@
>> +/*
>> + * arch/powerpc/platforms/embedded6xx/hlwd-pic.h
>> + *
>> + * Nintendo Wii "Hollywood" interrupt controller support.
>> + * Copyright (C) 2009 The GameCube Linux Team
>> + * Copyright (C) 2009 Albert Herranz
>> + *
>> + * 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 the Free Software Foundation; either version 2
>> + * of the License, or (at your option) any later version.
>> + *
>> + */
>> +
>> +#ifndef __HLWD_PIC_H
>> +#define __HLWD_PIC_H
>> +
>> +extern unsigned int hlwd_pic_get_irq(void);
>> +extern void hlwd_pic_probe(void);
>> +extern void hlwd_quiesce(void);
>> +
>> +#endif
>> --
>> 1.6.3.3
>>
>> _______________________________________________
>> Linuxppc-dev mailing list
>> Linuxppc-dev at lists.ozlabs.org
>> https://lists.ozlabs.org/listinfo/linuxppc-dev
>>
>
>
>
Cheers,
Albert
More information about the Linuxppc-dev
mailing list