From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp106.mail.ukl.yahoo.com (smtp106.mail.ukl.yahoo.com [77.238.184.38]) by ozlabs.org (Postfix) with SMTP id B1A5B100855 for ; Mon, 23 Nov 2009 09:02:16 +1100 (EST) From: Albert Herranz To: linuxppc-dev@lists.ozlabs.org Subject: [RFC PATCH 16/19] powerpc: wii: hollywood interrupt controller support Date: Sun, 22 Nov 2009 23:01:47 +0100 Message-Id: <1258927311-4340-17-git-send-email-albert_herranz@yahoo.es> In-Reply-To: <1258927311-4340-16-git-send-email-albert_herranz@yahoo.es> References: <1258927311-4340-1-git-send-email-albert_herranz@yahoo.es> <1258927311-4340-2-git-send-email-albert_herranz@yahoo.es> <1258927311-4340-3-git-send-email-albert_herranz@yahoo.es> <1258927311-4340-4-git-send-email-albert_herranz@yahoo.es> <1258927311-4340-5-git-send-email-albert_herranz@yahoo.es> <1258927311-4340-6-git-send-email-albert_herranz@yahoo.es> <1258927311-4340-7-git-send-email-albert_herranz@yahoo.es> <1258927311-4340-8-git-send-email-albert_herranz@yahoo.es> <1258927311-4340-9-git-send-email-albert_herranz@yahoo.es> <1258927311-4340-10-git-send-email-albert_herranz@yahoo.es> <1258927311-4340-11-git-send-email-albert_herranz@yahoo.es> <1258927311-4340-12-git-send-email-albert_herranz@yahoo.es> <1258927311-4340-13-git-send-email-albert_herranz@yahoo.es> <1258927311-4340-14-git-send-email-albert_herranz@yahoo.es> <1258927311-4340-15-git-send-email-albert_herranz@yahoo.es> <1258927311-4340-16-git-send-email-albert_herranz@yahoo.es> Cc: Albert Herranz List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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 --- 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: +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 +#include +#include +#include +#include + +#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