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Release 4.14 drivers/irqchip/irq-or1k-pic.c

Directory: drivers/irqchip
/*
 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
 * Copyright (C) 2014 Stefan Kristansson <stefan.kristiansson@saunalahti.fi>
 *
 * 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.
 */

#include <linux/irq.h>
#include <linux/irqchip.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>

/* OR1K PIC implementation */


struct or1k_pic_dev {
	
struct irq_chip chip;
	
irq_flow_handler_t handle;
	
unsigned long flags;
};

/*
 * We're a couple of cycles faster than the generic implementations with
 * these 'fast' versions.
 */


static void or1k_pic_mask(struct irq_data *data) { mtspr(SPR_PICMR, mfspr(SPR_PICMR) & ~(1UL << data->hwirq)); }

Contributors

PersonTokensPropCommitsCommitProp
Stefan Kristiansson30100.00%1100.00%
Total30100.00%1100.00%


static void or1k_pic_unmask(struct irq_data *data) { mtspr(SPR_PICMR, mfspr(SPR_PICMR) | (1UL << data->hwirq)); }

Contributors

PersonTokensPropCommitsCommitProp
Stefan Kristiansson29100.00%1100.00%
Total29100.00%1100.00%


static void or1k_pic_ack(struct irq_data *data) { mtspr(SPR_PICSR, (1UL << data->hwirq)); }

Contributors

PersonTokensPropCommitsCommitProp
Stefan Kristiansson24100.00%1100.00%
Total24100.00%1100.00%


static void or1k_pic_mask_ack(struct irq_data *data) { mtspr(SPR_PICMR, mfspr(SPR_PICMR) & ~(1UL << data->hwirq)); mtspr(SPR_PICSR, (1UL << data->hwirq)); }

Contributors

PersonTokensPropCommitsCommitProp
Stefan Kristiansson43100.00%1100.00%
Total43100.00%1100.00%

/* * There are two oddities with the OR1200 PIC implementation: * i) LEVEL-triggered interrupts are latched and need to be cleared * ii) the interrupt latch is cleared by writing a 0 to the bit, * as opposed to a 1 as mandated by the spec */
static void or1k_pic_or1200_ack(struct irq_data *data) { mtspr(SPR_PICSR, mfspr(SPR_PICSR) & ~(1UL << data->hwirq)); }

Contributors

PersonTokensPropCommitsCommitProp
Stefan Kristiansson30100.00%1100.00%
Total30100.00%1100.00%


static void or1k_pic_or1200_mask_ack(struct irq_data *data) { mtspr(SPR_PICMR, mfspr(SPR_PICMR) & ~(1UL << data->hwirq)); mtspr(SPR_PICSR, mfspr(SPR_PICSR) & ~(1UL << data->hwirq)); }

Contributors

PersonTokensPropCommitsCommitProp
Stefan Kristiansson49100.00%1100.00%
Total49100.00%1100.00%

static struct or1k_pic_dev or1k_pic_level = { .chip = { .name = "or1k-PIC-level", .irq_unmask = or1k_pic_unmask, .irq_mask = or1k_pic_mask, .irq_mask_ack = or1k_pic_mask_ack, }, .handle = handle_level_irq, .flags = IRQ_LEVEL | IRQ_NOPROBE, }; static struct or1k_pic_dev or1k_pic_edge = { .chip = { .name = "or1k-PIC-edge", .irq_unmask = or1k_pic_unmask, .irq_mask = or1k_pic_mask, .irq_ack = or1k_pic_ack, .irq_mask_ack = or1k_pic_mask_ack, }, .handle = handle_edge_irq, .flags = IRQ_LEVEL | IRQ_NOPROBE, }; static struct or1k_pic_dev or1k_pic_or1200 = { .chip = { .name = "or1200-PIC", .irq_unmask = or1k_pic_unmask, .irq_mask = or1k_pic_mask, .irq_ack = or1k_pic_or1200_ack, .irq_mask_ack = or1k_pic_or1200_mask_ack, }, .handle = handle_level_irq, .flags = IRQ_LEVEL | IRQ_NOPROBE, }; static struct irq_domain *root_domain;
static inline int pic_get_irq(int first) { int hwirq; hwirq = ffs(mfspr(SPR_PICSR) >> first); if (!hwirq) return NO_IRQ; else hwirq = hwirq + first - 1; return hwirq; }

Contributors

PersonTokensPropCommitsCommitProp
Stefan Kristiansson45100.00%1100.00%
Total45100.00%1100.00%


static void or1k_pic_handle_irq(struct pt_regs *regs) { int irq = -1; while ((irq = pic_get_irq(irq + 1)) != NO_IRQ) handle_domain_irq(root_domain, irq, regs); }

Contributors

PersonTokensPropCommitsCommitProp
Stefan Kristiansson3892.68%150.00%
Marc Zyngier37.32%150.00%
Total41100.00%2100.00%


static int or1k_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw) { struct or1k_pic_dev *pic = d->host_data; irq_set_chip_and_handler(irq, &pic->chip, pic->handle); irq_set_status_flags(irq, pic->flags); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Stefan Kristiansson53100.00%1100.00%
Total53100.00%1100.00%

static const struct irq_domain_ops or1k_irq_domain_ops = { .xlate = irq_domain_xlate_onecell, .map = or1k_map, }; /* * This sets up the IRQ domain for the PIC built in to the OpenRISC * 1000 CPU. This is the "root" domain as these are the interrupts * that directly trigger an exception in the CPU. */
static int __init or1k_pic_init(struct device_node *node, struct or1k_pic_dev *pic) { /* Disable all interrupts until explicitly requested */ mtspr(SPR_PICMR, (0UL)); root_domain = irq_domain_add_linear(node, 32, &or1k_irq_domain_ops, pic); set_handle_irq(or1k_pic_handle_irq); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Stefan Kristiansson49100.00%1100.00%
Total49100.00%1100.00%


static int __init or1k_pic_or1200_init(struct device_node *node, struct device_node *parent) { return or1k_pic_init(node, &or1k_pic_or1200); }

Contributors

PersonTokensPropCommitsCommitProp
Stefan Kristiansson26100.00%1100.00%
Total26100.00%1100.00%

IRQCHIP_DECLARE(or1k_pic_or1200, "opencores,or1200-pic", or1k_pic_or1200_init); IRQCHIP_DECLARE(or1k_pic, "opencores,or1k-pic", or1k_pic_or1200_init);
static int __init or1k_pic_level_init(struct device_node *node, struct device_node *parent) { return or1k_pic_init(node, &or1k_pic_level); }

Contributors

PersonTokensPropCommitsCommitProp
Stefan Kristiansson26100.00%1100.00%
Total26100.00%1100.00%

IRQCHIP_DECLARE(or1k_pic_level, "opencores,or1k-pic-level", or1k_pic_level_init);
static int __init or1k_pic_edge_init(struct device_node *node, struct device_node *parent) { return or1k_pic_init(node, &or1k_pic_edge); }

Contributors

PersonTokensPropCommitsCommitProp
Stefan Kristiansson26100.00%1100.00%
Total26100.00%1100.00%

IRQCHIP_DECLARE(or1k_pic_edge, "opencores,or1k-pic-edge", or1k_pic_edge_init);

Overall Contributors

PersonTokensPropCommitsCommitProp
Stefan Kristiansson70198.87%125.00%
Joël Porquet40.56%125.00%
Marc Zyngier30.42%125.00%
Pedro H. Penna10.14%125.00%
Total709100.00%4100.00%
Directory: drivers/irqchip
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