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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

PersonTokensPropCommitsCommitProp
Albert Herranz4785.45%133.33%
Lennert Buytenhek712.73%133.33%
Grant C. Likely11.82%133.33%
Total55100.00%3100.00%


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

PersonTokensPropCommitsCommitProp
Albert Herranz3380.49%133.33%
Lennert Buytenhek717.07%133.33%
Grant C. Likely12.44%133.33%
Total41100.00%3100.00%


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

PersonTokensPropCommitsCommitProp
Albert Herranz3280.00%133.33%
Lennert Buytenhek717.50%133.33%
Grant C. Likely12.50%133.33%
Total40100.00%3100.00%


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

PersonTokensPropCommitsCommitProp
Albert Herranz3280.00%133.33%
Lennert Buytenhek717.50%133.33%
Grant C. Likely12.50%133.33%
Total40100.00%3100.00%

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

PersonTokensPropCommitsCommitProp
Albert Herranz4187.23%125.00%
Thomas Gleixner510.64%250.00%
Grant C. Likely12.13%125.00%
Total47100.00%4100.00%


static int flipper_pic_match(struct irq_domain *h, struct device_node *np, enum irq_domain_bus_token bus_token) { return 1; }

Contributors

PersonTokensPropCommitsCommitProp
Albert Herranz1878.26%133.33%
Marc Zyngier417.39%133.33%
Grant C. Likely14.35%133.33%
Total23100.00%3100.00%

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

PersonTokensPropCommitsCommitProp
Albert Herranz30100.00%1100.00%
Total30100.00%1100.00%


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

PersonTokensPropCommitsCommitProp
Albert Herranz16094.12%133.33%
Grant C. Likely105.88%266.67%
Total170100.00%3100.00%


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

PersonTokensPropCommitsCommitProp
Albert Herranz6195.31%133.33%
Paul Gortmaker23.12%133.33%
Michael Ellerman11.56%133.33%
Total64100.00%3100.00%

/* * 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

PersonTokensPropCommitsCommitProp
Albert Herranz5298.11%150.00%
Paul Gortmaker11.89%150.00%
Total53100.00%2100.00%

/* * 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

PersonTokensPropCommitsCommitProp
Albert Herranz21100.00%1100.00%
Total21100.00%1100.00%

/* * 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

PersonTokensPropCommitsCommitProp
Albert Herranz37100.00%1100.00%
Total37100.00%1100.00%

/* * 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

PersonTokensPropCommitsCommitProp
Albert Herranz51100.00%1100.00%
Total51100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Albert Herranz72391.40%18.33%
Lennert Buytenhek324.05%18.33%
Grant C. Likely202.53%433.33%
Thomas Gleixner50.63%216.67%
Marc Zyngier40.51%18.33%
Paul Gortmaker30.38%18.33%
Rob Herring30.38%18.33%
Michael Ellerman10.13%18.33%
Total791100.00%12100.00%
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