![Marc Zyngier](/assets/img/avatar_default.png)
It is not uncommon (at least with the ARM stuff) to have a piece of hardware that implements different flavours of "interrupts". A typical example of this is the GICv3 ITS, which implements standard PCI/MSI support, but also some form of "generic MSI". So far, the PCI/MSI domain is registered using the ITS device_node, so that irq_find_host can return it. On the contrary, the raw MSI domain is not registered with an device_node, making it impossible to be looked up by another subsystem (obviously, using the same device_node twice would only result in confusion, as it is not defined which one irq_find_host would return). A solution to this is to "type" domains that may be aliasing, and to be able to lookup an device_node that matches a given type. For this, we introduce irq_find_matching_host() as a superset of irq_find_host: struct irq_domain *irq_find_matching_host(struct device_node *node, enum irq_domain_bus_token bus_token); where bus_token is the "type" we want to match the domain against (so far, only DOMAIN_BUS_ANY is defined). This result in some moderately invasive changes on the PPC side (which is the only user of the .match method). This has otherwise no functionnal change. Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Cc: <linux-arm-kernel@lists.infradead.org> Cc: Yijing Wang <wangyijing@huawei.com> Cc: Ma Jun <majun258@huawei.com> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: Duc Dang <dhdang@apm.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Jiang Liu <jiang.liu@linux.intel.com> Cc: Jason Cooper <jason@lakedaemon.net> Link: http://lkml.kernel.org/r/1438091186-10244-2-git-send-email-marc.zyngier@arm.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
257 lines
5.4 KiB
C
257 lines
5.4 KiB
C
/*
|
|
* arch/powerpc/platforms/embedded6xx/flipper-pic.c
|
|
*
|
|
* Nintendo GameCube/Wii "Flipper" interrupt controller support.
|
|
* Copyright (C) 2004-2009 The GameCube Linux Team
|
|
* Copyright (C) 2007,2008,2009 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 "flipper-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 <linux/of_address.h>
|
|
#include <asm/io.h>
|
|
|
|
#include "flipper-pic.h"
|
|
|
|
#define FLIPPER_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 setting/clearing
|
|
* the corresponding bit in IMR.
|
|
* Except for the RSW interrupt, all interrupts get deasserted automatically
|
|
* when the source deasserts the interrupt.
|
|
*/
|
|
#define FLIPPER_ICR 0x00
|
|
#define FLIPPER_ICR_RSS (1<<16) /* reset switch state */
|
|
|
|
#define FLIPPER_IMR 0x04
|
|
|
|
#define FLIPPER_RESET 0x24
|
|
|
|
|
|
/*
|
|
* IRQ chip hooks.
|
|
*
|
|
*/
|
|
|
|
static void flipper_pic_mask_and_ack(struct irq_data *d)
|
|
{
|
|
int irq = irqd_to_hwirq(d);
|
|
void __iomem *io_base = irq_data_get_irq_chip_data(d);
|
|
u32 mask = 1 << irq;
|
|
|
|
clrbits32(io_base + FLIPPER_IMR, mask);
|
|
/* this is at least needed for RSW */
|
|
out_be32(io_base + FLIPPER_ICR, mask);
|
|
}
|
|
|
|
static void flipper_pic_ack(struct irq_data *d)
|
|
{
|
|
int irq = irqd_to_hwirq(d);
|
|
void __iomem *io_base = irq_data_get_irq_chip_data(d);
|
|
|
|
/* this is at least needed for RSW */
|
|
out_be32(io_base + FLIPPER_ICR, 1 << irq);
|
|
}
|
|
|
|
static void flipper_pic_mask(struct irq_data *d)
|
|
{
|
|
int irq = irqd_to_hwirq(d);
|
|
void __iomem *io_base = irq_data_get_irq_chip_data(d);
|
|
|
|
clrbits32(io_base + FLIPPER_IMR, 1 << irq);
|
|
}
|
|
|
|
static void flipper_pic_unmask(struct irq_data *d)
|
|
{
|
|
int irq = irqd_to_hwirq(d);
|
|
void __iomem *io_base = irq_data_get_irq_chip_data(d);
|
|
|
|
setbits32(io_base + FLIPPER_IMR, 1 << irq);
|
|
}
|
|
|
|
|
|
static struct irq_chip flipper_pic = {
|
|
.name = "flipper-pic",
|
|
.irq_ack = flipper_pic_ack,
|
|
.irq_mask_ack = flipper_pic_mask_and_ack,
|
|
.irq_mask = flipper_pic_mask,
|
|
.irq_unmask = flipper_pic_unmask,
|
|
};
|
|
|
|
/*
|
|
* IRQ host hooks.
|
|
*
|
|
*/
|
|
|
|
static struct irq_domain *flipper_irq_host;
|
|
|
|
static int flipper_pic_map(struct irq_domain *h, unsigned int virq,
|
|
irq_hw_number_t hwirq)
|
|
{
|
|
irq_set_chip_data(virq, h->host_data);
|
|
irq_set_status_flags(virq, IRQ_LEVEL);
|
|
irq_set_chip_and_handler(virq, &flipper_pic, handle_level_irq);
|
|
return 0;
|
|
}
|
|
|
|
static int flipper_pic_match(struct irq_domain *h, struct device_node *np,
|
|
enum irq_domain_bus_token bus_token)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
|
|
static const struct irq_domain_ops flipper_irq_domain_ops = {
|
|
.map = flipper_pic_map,
|
|
.match = flipper_pic_match,
|
|
};
|
|
|
|
/*
|
|
* Platform hooks.
|
|
*
|
|
*/
|
|
|
|
static void __flipper_quiesce(void __iomem *io_base)
|
|
{
|
|
/* mask and ack all IRQs */
|
|
out_be32(io_base + FLIPPER_IMR, 0x00000000);
|
|
out_be32(io_base + FLIPPER_ICR, 0xffffffff);
|
|
}
|
|
|
|
struct irq_domain * __init flipper_pic_init(struct device_node *np)
|
|
{
|
|
struct device_node *pi;
|
|
struct irq_domain *irq_domain = NULL;
|
|
struct resource res;
|
|
void __iomem *io_base;
|
|
int retval;
|
|
|
|
pi = of_get_parent(np);
|
|
if (!pi) {
|
|
pr_err("no parent found\n");
|
|
goto out;
|
|
}
|
|
if (!of_device_is_compatible(pi, "nintendo,flipper-pi")) {
|
|
pr_err("unexpected parent compatible\n");
|
|
goto out;
|
|
}
|
|
|
|
retval = of_address_to_resource(pi, 0, &res);
|
|
if (retval) {
|
|
pr_err("no io memory range found\n");
|
|
goto out;
|
|
}
|
|
io_base = ioremap(res.start, resource_size(&res));
|
|
|
|
pr_info("controller at 0x%08x mapped to 0x%p\n", res.start, io_base);
|
|
|
|
__flipper_quiesce(io_base);
|
|
|
|
irq_domain = irq_domain_add_linear(np, FLIPPER_NR_IRQS,
|
|
&flipper_irq_domain_ops, io_base);
|
|
if (!irq_domain) {
|
|
pr_err("failed to allocate irq_domain\n");
|
|
return NULL;
|
|
}
|
|
|
|
out:
|
|
return irq_domain;
|
|
}
|
|
|
|
unsigned int flipper_pic_get_irq(void)
|
|
{
|
|
void __iomem *io_base = flipper_irq_host->host_data;
|
|
int irq;
|
|
u32 irq_status;
|
|
|
|
irq_status = in_be32(io_base + FLIPPER_ICR) &
|
|
in_be32(io_base + FLIPPER_IMR);
|
|
if (irq_status == 0)
|
|
return NO_IRQ; /* no more IRQs pending */
|
|
|
|
irq = __ffs(irq_status);
|
|
return irq_linear_revmap(flipper_irq_host, irq);
|
|
}
|
|
|
|
/*
|
|
* Probe function.
|
|
*
|
|
*/
|
|
|
|
void __init flipper_pic_probe(void)
|
|
{
|
|
struct device_node *np;
|
|
|
|
np = of_find_compatible_node(NULL, NULL, "nintendo,flipper-pic");
|
|
BUG_ON(!np);
|
|
|
|
flipper_irq_host = flipper_pic_init(np);
|
|
BUG_ON(!flipper_irq_host);
|
|
|
|
irq_set_default_host(flipper_irq_host);
|
|
|
|
of_node_put(np);
|
|
}
|
|
|
|
/*
|
|
* Misc functions related to the flipper chipset.
|
|
*
|
|
*/
|
|
|
|
/**
|
|
* flipper_quiesce() - quiesce flipper irq controller
|
|
*
|
|
* Mask and ack all interrupt sources.
|
|
*
|
|
*/
|
|
void flipper_quiesce(void)
|
|
{
|
|
void __iomem *io_base = flipper_irq_host->host_data;
|
|
|
|
__flipper_quiesce(io_base);
|
|
}
|
|
|
|
/*
|
|
* Resets the platform.
|
|
*/
|
|
void flipper_platform_reset(void)
|
|
{
|
|
void __iomem *io_base;
|
|
|
|
if (flipper_irq_host && flipper_irq_host->host_data) {
|
|
io_base = flipper_irq_host->host_data;
|
|
out_8(io_base + FLIPPER_RESET, 0x00);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Returns non-zero if the reset button is pressed.
|
|
*/
|
|
int flipper_is_reset_button_pressed(void)
|
|
{
|
|
void __iomem *io_base;
|
|
u32 icr;
|
|
|
|
if (flipper_irq_host && flipper_irq_host->host_data) {
|
|
io_base = flipper_irq_host->host_data;
|
|
icr = in_be32(io_base + FLIPPER_ICR);
|
|
return !(icr & FLIPPER_ICR_RSS);
|
|
}
|
|
return 0;
|
|
}
|
|
|