Merge tag 'irqchip-core-3.17' of git://git.infradead.org/users/jcooper/linux into irq/core

irqchip core changes for v3.17
 * nvic: use generic noop function
 * spear_shirq: generic cleanup, simplification, and refactoring

drivers/irqchip/irq-nvic.c

@@ -49,14 +49,6 @@ nvic_handle_irq(irq_hw_number_t hwirq, struct pt_regs *regs)
 	handle_IRQ(irq, regs);
 }
 
-static void nvic_eoi(struct irq_data *d)
-{
-	/*
-	 * This is a no-op as end of interrupt is signaled by the exception
-	 * return sequence.
-	 */
-}
-
 static int __init nvic_of_init(struct device_node *node,
 			       struct device_node *parent)
 {
@@ -102,7 +94,10 @@ static int __init nvic_of_init(struct device_node *node,
 		gc->chip_types[0].regs.disable = NVIC_ICER;
 		gc->chip_types[0].chip.irq_mask = irq_gc_mask_disable_reg;
 		gc->chip_types[0].chip.irq_unmask = irq_gc_unmask_enable_reg;
-		gc->chip_types[0].chip.irq_eoi = nvic_eoi;
+		/* This is a no-op as end of interrupt is signaled by the
+		 * exception return sequence.
+		 */
+		gc->chip_types[0].chip.irq_eoi = irq_gc_noop;
 
 		/* disable interrupts */
 		writel_relaxed(~0, gc->reg_base + NVIC_ICER);

drivers/irqchip/spear-shirq.c

@@ -19,7 +19,6 @@
 #include <linux/io.h>
 #include <linux/irq.h>
 #include <linux/irqdomain.h>
-#include <linux/irqchip/spear-shirq.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
@@ -27,20 +26,73 @@
 
 #include "irqchip.h"
 
-static DEFINE_SPINLOCK(lock);
+/*
+ * struct spear_shirq: shared irq structure
+ *
+ * base:	Base register address
+ * status_reg:	Status register offset for chained interrupt handler
+ * mask_reg:	Mask register offset for irq chip
+ * mask:	Mask to apply to the status register
+ * virq_base:	Base virtual interrupt number
+ * nr_irqs:	Number of interrupts handled by this block
+ * offset:	Bit offset of the first interrupt
+ * irq_chip:	Interrupt controller chip used for this instance,
+ *		if NULL group is disabled, but accounted
+ */
+struct spear_shirq {
+	void __iomem		*base;
+	u32			status_reg;
+	u32			mask_reg;
+	u32			mask;
+	u32			virq_base;
+	u32			nr_irqs;
+	u32			offset;
+	struct irq_chip		*irq_chip;
+};
 
 /* spear300 shared irq registers offsets and masks */
 #define SPEAR300_INT_ENB_MASK_REG	0x54
 #define SPEAR300_INT_STS_MASK_REG	0x58
 
+static DEFINE_RAW_SPINLOCK(shirq_lock);
+
+static void shirq_irq_mask(struct irq_data *d)
+{
+	struct spear_shirq *shirq = irq_data_get_irq_chip_data(d);
+	u32 val, shift = d->irq - shirq->virq_base + shirq->offset;
+	u32 __iomem *reg = shirq->base + shirq->mask_reg;
+
+	raw_spin_lock(&shirq_lock);
+	val = readl(reg) & ~(0x1 << shift);
+	writel(val, reg);
+	raw_spin_unlock(&shirq_lock);
+}
+
+static void shirq_irq_unmask(struct irq_data *d)
+{
+	struct spear_shirq *shirq = irq_data_get_irq_chip_data(d);
+	u32 val, shift = d->irq - shirq->virq_base + shirq->offset;
+	u32 __iomem *reg = shirq->base + shirq->mask_reg;
+
+	raw_spin_lock(&shirq_lock);
+	val = readl(reg) | (0x1 << shift);
+	writel(val, reg);
+	raw_spin_unlock(&shirq_lock);
+}
+
+static struct irq_chip shirq_chip = {
+	.name		= "spear-shirq",
+	.irq_mask	= shirq_irq_mask,
+	.irq_unmask	= shirq_irq_unmask,
+};
+
 static struct spear_shirq spear300_shirq_ras1 = {
-	.irq_nr = 9,
-	.irq_bit_off = 0,
-	.regs = {
-		.enb_reg = SPEAR300_INT_ENB_MASK_REG,
+	.offset		= 0,
+	.nr_irqs	= 9,
+	.mask		= ((0x1 << 9) - 1) << 0,
+	.irq_chip	= &shirq_chip,
 	.status_reg	= SPEAR300_INT_STS_MASK_REG,
-		.clear_reg = -1,
-	},
+	.mask_reg	= SPEAR300_INT_ENB_MASK_REG,
 };
 
 static struct spear_shirq *spear300_shirq_blocks[] = {
@@ -51,43 +103,35 @@ static struct spear_shirq *spear300_shirq_blocks[] = {
 #define SPEAR310_INT_STS_MASK_REG	0x04
 
 static struct spear_shirq spear310_shirq_ras1 = {
-	.irq_nr = 8,
-	.irq_bit_off = 0,
-	.regs = {
-		.enb_reg = -1,
+	.offset		= 0,
+	.nr_irqs	= 8,
+	.mask		= ((0x1 << 8) - 1) << 0,
+	.irq_chip	= &dummy_irq_chip,
 	.status_reg	= SPEAR310_INT_STS_MASK_REG,
-		.clear_reg = -1,
-	},
 };
 
 static struct spear_shirq spear310_shirq_ras2 = {
-	.irq_nr = 5,
-	.irq_bit_off = 8,
-	.regs = {
-		.enb_reg = -1,
+	.offset		= 8,
+	.nr_irqs	= 5,
+	.mask		= ((0x1 << 5) - 1) << 8,
+	.irq_chip	= &dummy_irq_chip,
 	.status_reg	= SPEAR310_INT_STS_MASK_REG,
-		.clear_reg = -1,
-	},
 };
 
 static struct spear_shirq spear310_shirq_ras3 = {
-	.irq_nr = 1,
-	.irq_bit_off = 13,
-	.regs = {
-		.enb_reg = -1,
+	.offset		= 13,
+	.nr_irqs	= 1,
+	.mask		= ((0x1 << 1) - 1) << 13,
+	.irq_chip	= &dummy_irq_chip,
 	.status_reg	= SPEAR310_INT_STS_MASK_REG,
-		.clear_reg = -1,
-	},
 };
 
 static struct spear_shirq spear310_shirq_intrcomm_ras = {
-	.irq_nr = 3,
-	.irq_bit_off = 14,
-	.regs = {
-		.enb_reg = -1,
+	.offset		= 14,
+	.nr_irqs	= 3,
+	.mask		= ((0x1 << 3) - 1) << 14,
+	.irq_chip	= &dummy_irq_chip,
 	.status_reg	= SPEAR310_INT_STS_MASK_REG,
-		.clear_reg = -1,
-	},
 };
 
 static struct spear_shirq *spear310_shirq_blocks[] = {
@@ -102,50 +146,34 @@ static struct spear_shirq *spear310_shirq_blocks[] = {
 #define SPEAR320_INT_CLR_MASK_REG		0x04
 #define SPEAR320_INT_ENB_MASK_REG		0x08
 
-static struct spear_shirq spear320_shirq_ras1 = {
-	.irq_nr = 3,
-	.irq_bit_off = 7,
-	.regs = {
-		.enb_reg = -1,
-		.status_reg = SPEAR320_INT_STS_MASK_REG,
-		.clear_reg = SPEAR320_INT_CLR_MASK_REG,
-		.reset_to_clear = 1,
-	},
+static struct spear_shirq spear320_shirq_ras3 = {
+	.offset		= 0,
+	.nr_irqs	= 7,
+	.mask		= ((0x1 << 7) - 1) << 0,
 };
 
-static struct spear_shirq spear320_shirq_ras2 = {
-	.irq_nr = 1,
-	.irq_bit_off = 10,
-	.regs = {
-		.enb_reg = -1,
+static struct spear_shirq spear320_shirq_ras1 = {
+	.offset		= 7,
+	.nr_irqs	= 3,
+	.mask		= ((0x1 << 3) - 1) << 7,
+	.irq_chip	= &dummy_irq_chip,
 	.status_reg	= SPEAR320_INT_STS_MASK_REG,
-		.clear_reg = SPEAR320_INT_CLR_MASK_REG,
-		.reset_to_clear = 1,
-	},
 };
 
-static struct spear_shirq spear320_shirq_ras3 = {
-	.irq_nr = 7,
-	.irq_bit_off = 0,
-	.invalid_irq = 1,
-	.regs = {
-		.enb_reg = SPEAR320_INT_ENB_MASK_REG,
-		.reset_to_enb = 1,
+static struct spear_shirq spear320_shirq_ras2 = {
+	.offset		= 10,
+	.nr_irqs	= 1,
+	.mask		= ((0x1 << 1) - 1) << 10,
+	.irq_chip	= &dummy_irq_chip,
 	.status_reg	= SPEAR320_INT_STS_MASK_REG,
-		.clear_reg = SPEAR320_INT_CLR_MASK_REG,
-		.reset_to_clear = 1,
-	},
 };
 
 static struct spear_shirq spear320_shirq_intrcomm_ras = {
-	.irq_nr = 11,
-	.irq_bit_off = 11,
-	.regs = {
-		.enb_reg = -1,
+	.offset		= 11,
+	.nr_irqs	= 11,
+	.mask		= ((0x1 << 11) - 1) << 11,
+	.irq_chip	= &dummy_irq_chip,
 	.status_reg	= SPEAR320_INT_STS_MASK_REG,
-		.clear_reg = SPEAR320_INT_CLR_MASK_REG,
-		.reset_to_clear = 1,
-	},
 };
 
 static struct spear_shirq *spear320_shirq_blocks[] = {
@@ -155,104 +183,46 @@ static struct spear_shirq *spear320_shirq_blocks[] = {
 	&spear320_shirq_intrcomm_ras,
 };
 
-static void shirq_irq_mask_unmask(struct irq_data *d, bool mask)
-{
-	struct spear_shirq *shirq = irq_data_get_irq_chip_data(d);
-	u32 val, offset = d->irq - shirq->irq_base;
-	unsigned long flags;
-
-	if (shirq->regs.enb_reg == -1)
-		return;
-
-	spin_lock_irqsave(&lock, flags);
-	val = readl(shirq->base + shirq->regs.enb_reg);
-
-	if (mask ^ shirq->regs.reset_to_enb)
-		val &= ~(0x1 << shirq->irq_bit_off << offset);
-	else
-		val |= 0x1 << shirq->irq_bit_off << offset;
-
-	writel(val, shirq->base + shirq->regs.enb_reg);
-	spin_unlock_irqrestore(&lock, flags);
-
-}
-
-static void shirq_irq_mask(struct irq_data *d)
-{
-	shirq_irq_mask_unmask(d, 1);
-}
-
-static void shirq_irq_unmask(struct irq_data *d)
-{
-	shirq_irq_mask_unmask(d, 0);
-}
-
-static struct irq_chip shirq_chip = {
-	.name		= "spear-shirq",
-	.irq_ack	= shirq_irq_mask,
-	.irq_mask	= shirq_irq_mask,
-	.irq_unmask	= shirq_irq_unmask,
-};
-
 static void shirq_handler(unsigned irq, struct irq_desc *desc)
 {
-	u32 i, j, val, mask, tmp;
-	struct irq_chip *chip;
 	struct spear_shirq *shirq = irq_get_handler_data(irq);
+	u32 pend;
 
-	chip = irq_get_chip(irq);
-	chip->irq_ack(&desc->irq_data);
+	pend = readl(shirq->base + shirq->status_reg) & shirq->mask;
+	pend >>= shirq->offset;
 
-	mask = ((0x1 << shirq->irq_nr) - 1) << shirq->irq_bit_off;
-	while ((val = readl(shirq->base + shirq->regs.status_reg) &
-				mask)) {
+	while (pend) {
+		int irq = __ffs(pend);
 
-		val >>= shirq->irq_bit_off;
-		for (i = 0, j = 1; i < shirq->irq_nr; i++, j <<= 1) {
-
-			if (!(j & val))
-				continue;
-
-			generic_handle_irq(shirq->irq_base + i);
-
-			/* clear interrupt */
-			if (shirq->regs.clear_reg == -1)
-				continue;
-
-			tmp = readl(shirq->base + shirq->regs.clear_reg);
-			if (shirq->regs.reset_to_clear)
-				tmp &= ~(j << shirq->irq_bit_off);
-			else
-				tmp |= (j << shirq->irq_bit_off);
-			writel(tmp, shirq->base + shirq->regs.clear_reg);
+		pend &= ~(0x1 << irq);
+		generic_handle_irq(shirq->virq_base + irq);
 	}
-	}
-	chip->irq_unmask(&desc->irq_data);
 }
 
-static void __init spear_shirq_register(struct spear_shirq *shirq)
+static void __init spear_shirq_register(struct spear_shirq *shirq,
+					int parent_irq)
 {
 	int i;
 
-	if (shirq->invalid_irq)
+	if (!shirq->irq_chip)
 		return;
 
-	irq_set_chained_handler(shirq->irq, shirq_handler);
-	for (i = 0; i < shirq->irq_nr; i++) {
-		irq_set_chip_and_handler(shirq->irq_base + i,
-					 &shirq_chip, handle_simple_irq);
-		set_irq_flags(shirq->irq_base + i, IRQF_VALID);
-		irq_set_chip_data(shirq->irq_base + i, shirq);
-	}
+	irq_set_chained_handler(parent_irq, shirq_handler);
+	irq_set_handler_data(parent_irq, shirq);
 
-	irq_set_handler_data(shirq->irq, shirq);
+	for (i = 0; i < shirq->nr_irqs; i++) {
+		irq_set_chip_and_handler(shirq->virq_base + i,
+					 shirq->irq_chip, handle_simple_irq);
+		set_irq_flags(shirq->virq_base + i, IRQF_VALID);
+		irq_set_chip_data(shirq->virq_base + i, shirq);
+	}
 }
 
 static int __init shirq_init(struct spear_shirq **shirq_blocks, int block_nr,
 		struct device_node *np)
 {
-	int i, irq_base, hwirq = 0, irq_nr = 0;
-	static struct irq_domain *shirq_domain;
+	int i, parent_irq, virq_base, hwirq = 0, nr_irqs = 0;
+	struct irq_domain *shirq_domain;
 	void __iomem *base;
 
 	base = of_iomap(np, 0);
@@ -262,15 +232,15 @@ static int __init shirq_init(struct spear_shirq **shirq_blocks, int block_nr,
 	}
 
 	for (i = 0; i < block_nr; i++)
-		irq_nr += shirq_blocks[i]->irq_nr;
+		nr_irqs += shirq_blocks[i]->nr_irqs;
 
-	irq_base = irq_alloc_descs(-1, 0, irq_nr, 0);
-	if (IS_ERR_VALUE(irq_base)) {
+	virq_base = irq_alloc_descs(-1, 0, nr_irqs, 0);
+	if (IS_ERR_VALUE(virq_base)) {
 		pr_err("%s: irq desc alloc failed\n", __func__);
 		goto err_unmap;
 	}
 
-	shirq_domain = irq_domain_add_legacy(np, irq_nr, irq_base, 0,
+	shirq_domain = irq_domain_add_legacy(np, nr_irqs, virq_base, 0,
 			&irq_domain_simple_ops, NULL);
 	if (WARN_ON(!shirq_domain)) {
 		pr_warn("%s: irq domain init failed\n", __func__);
@@ -279,24 +249,24 @@ static int __init shirq_init(struct spear_shirq **shirq_blocks, int block_nr,
 
 	for (i = 0; i < block_nr; i++) {
 		shirq_blocks[i]->base = base;
-		shirq_blocks[i]->irq_base = irq_find_mapping(shirq_domain,
+		shirq_blocks[i]->virq_base = irq_find_mapping(shirq_domain,
 				hwirq);
-		shirq_blocks[i]->irq = irq_of_parse_and_map(np, i);
 
-		spear_shirq_register(shirq_blocks[i]);
-		hwirq += shirq_blocks[i]->irq_nr;
+		parent_irq = irq_of_parse_and_map(np, i);
+		spear_shirq_register(shirq_blocks[i], parent_irq);
+		hwirq += shirq_blocks[i]->nr_irqs;
 	}
 
 	return 0;
 
 err_free_desc:
-	irq_free_descs(irq_base, irq_nr);
+	irq_free_descs(virq_base, nr_irqs);
 err_unmap:
 	iounmap(base);
 	return -ENXIO;
 }
 
-int __init spear300_shirq_of_init(struct device_node *np,
+static int __init spear300_shirq_of_init(struct device_node *np,
 					 struct device_node *parent)
 {
 	return shirq_init(spear300_shirq_blocks,
@@ -304,7 +274,7 @@ int __init spear300_shirq_of_init(struct device_node *np,
 }
 IRQCHIP_DECLARE(spear300_shirq, "st,spear300-shirq", spear300_shirq_of_init);
 
-int __init spear310_shirq_of_init(struct device_node *np,
+static int __init spear310_shirq_of_init(struct device_node *np,
 					 struct device_node *parent)
 {
 	return shirq_init(spear310_shirq_blocks,
@@ -312,7 +282,7 @@ int __init spear310_shirq_of_init(struct device_node *np,
 }
 IRQCHIP_DECLARE(spear310_shirq, "st,spear310-shirq", spear310_shirq_of_init);
 
-int __init spear320_shirq_of_init(struct device_node *np,
+static int __init spear320_shirq_of_init(struct device_node *np,
 					 struct device_node *parent)
 {
 	return shirq_init(spear320_shirq_blocks,

include/linux/irqchip/spear-shirq.h

-/*
- * SPEAr platform shared irq layer header file
- *
- * Copyright (C) 2009-2012 ST Microelectronics
- * Viresh Kumar <viresh.linux@gmail.com>
- *
- * This file is licensed under the terms of the GNU General Public
- * License version 2. This program is licensed "as is" without any
- * warranty of any kind, whether express or implied.
- */
-
-#ifndef __SPEAR_SHIRQ_H
-#define __SPEAR_SHIRQ_H
-
-#include <linux/irq.h>
-#include <linux/types.h>
-
-/*
- * struct shirq_regs: shared irq register configuration
- *
- * enb_reg: enable register offset
- * reset_to_enb: val 1 indicates, we need to clear bit for enabling interrupt
- * status_reg: status register offset
- * status_reg_mask: status register valid mask
- * clear_reg: clear register offset
- * reset_to_clear: val 1 indicates, we need to clear bit for clearing interrupt
- */
-struct shirq_regs {
-	u32 enb_reg;
-	u32 reset_to_enb;
-	u32 status_reg;
-	u32 clear_reg;
-	u32 reset_to_clear;
-};
-
-/*
- * struct spear_shirq: shared irq structure
- *
- * irq: hardware irq number
- * irq_base: base irq in linux domain
- * irq_nr: no. of shared interrupts in a particular block
- * irq_bit_off: starting bit offset in the status register
- * invalid_irq: irq group is currently disabled
- * base: base address of shared irq register
- * regs: register configuration for shared irq block
- */
-struct spear_shirq {
-	u32 irq;
-	u32 irq_base;
-	u32 irq_nr;
-	u32 irq_bit_off;
-	int invalid_irq;
-	void __iomem *base;
-	struct shirq_regs regs;
-};
-
-int __init spear300_shirq_of_init(struct device_node *np,
-		struct device_node *parent);
-int __init spear310_shirq_of_init(struct device_node *np,
-		struct device_node *parent);
-int __init spear320_shirq_of_init(struct device_node *np,
-		struct device_node *parent);
-
-#endif /* __SPEAR_SHIRQ_H */