Release 4.14 arch/powerpc/platforms/embedded6xx/flipper-pic.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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Albert Herranz | 47 | 85.45% | 1 | 33.33% |
| Lennert Buytenhek | 7 | 12.73% | 1 | 33.33% |
| Grant C. Likely | 1 | 1.82% | 1 | 33.33% |
| Total | 55 | 100.00% | 3 | 100.00% |
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Albert Herranz | 33 | 80.49% | 1 | 33.33% |
| Lennert Buytenhek | 7 | 17.07% | 1 | 33.33% |
| Grant C. Likely | 1 | 2.44% | 1 | 33.33% |
| Total | 41 | 100.00% | 3 | 100.00% |
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Albert Herranz | 32 | 80.00% | 1 | 33.33% |
| Lennert Buytenhek | 7 | 17.50% | 1 | 33.33% |
| Grant C. Likely | 1 | 2.50% | 1 | 33.33% |
| Total | 40 | 100.00% | 3 | 100.00% |
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Albert Herranz | 32 | 80.00% | 1 | 33.33% |
| Lennert Buytenhek | 7 | 17.50% | 1 | 33.33% |
| Grant C. Likely | 1 | 2.50% | 1 | 33.33% |
| Total | 40 | 100.00% | 3 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Albert Herranz | 41 | 87.23% | 1 | 25.00% |
| Thomas Gleixner | 5 | 10.64% | 2 | 50.00% |
| Grant C. Likely | 1 | 2.13% | 1 | 25.00% |
| Total | 47 | 100.00% | 4 | 100.00% |
static int flipper_pic_match(struct irq_domain *h, struct device_node *np,
enum irq_domain_bus_token bus_token)
{
return 1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Albert Herranz | 18 | 78.26% | 1 | 33.33% |
| Marc Zyngier | 4 | 17.39% | 1 | 33.33% |
| Grant C. Likely | 1 | 4.35% | 1 | 33.33% |
| Total | 23 | 100.00% | 3 | 100.00% |
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Albert Herranz | 30 | 100.00% | 1 | 100.00% |
| Total | 30 | 100.00% | 1 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Albert Herranz | 160 | 94.12% | 1 | 33.33% |
| Grant C. Likely | 10 | 5.88% | 2 | 66.67% |
| Total | 170 | 100.00% | 3 | 100.00% |
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 0; /* no more IRQs pending */
irq = __ffs(irq_status);
return irq_linear_revmap(flipper_irq_host, irq);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Albert Herranz | 61 | 95.31% | 1 | 33.33% |
| Paul Gortmaker | 2 | 3.12% | 1 | 33.33% |
| Michael Ellerman | 1 | 1.56% | 1 | 33.33% |
| Total | 64 | 100.00% | 3 | 100.00% |
/*
* 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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Albert Herranz | 52 | 98.11% | 1 | 50.00% |
| Paul Gortmaker | 1 | 1.89% | 1 | 50.00% |
| Total | 53 | 100.00% | 2 | 100.00% |
/*
* 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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Albert Herranz | 21 | 100.00% | 1 | 100.00% |
| Total | 21 | 100.00% | 1 | 100.00% |
/*
* 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);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Albert Herranz | 37 | 100.00% | 1 | 100.00% |
| Total | 37 | 100.00% | 1 | 100.00% |
/*
* 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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Albert Herranz | 51 | 100.00% | 1 | 100.00% |
| Total | 51 | 100.00% | 1 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Albert Herranz | 723 | 91.40% | 1 | 8.33% |
| Lennert Buytenhek | 32 | 4.05% | 1 | 8.33% |
| Grant C. Likely | 20 | 2.53% | 4 | 33.33% |
| Thomas Gleixner | 5 | 0.63% | 2 | 16.67% |
| Marc Zyngier | 4 | 0.51% | 1 | 8.33% |
| Paul Gortmaker | 3 | 0.38% | 1 | 8.33% |
| Rob Herring | 3 | 0.38% | 1 | 8.33% |
| Michael Ellerman | 1 | 0.13% | 1 | 8.33% |
| Total | 791 | 100.00% | 12 | 100.00% |
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