drivers/irqchip/irq-csky-apb-intc.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.

 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/module.h>
 #include <linux/irqdomain.h>
 #include <linux/irqchip.h>
 #include <linux/irq.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <asm/irq.h>

 #define INTC_IRQS		64

 #define CK_INTC_ICR		0x00
 #define CK_INTC_PEN31_00	0x14
 #define CK_INTC_PEN63_32	0x2c
 #define CK_INTC_NEN31_00	0x10
 #define CK_INTC_NEN63_32	0x28
 #define CK_INTC_SOURCE		0x40
 #define CK_INTC_DUAL_BASE	0x100

 #define GX_INTC_PEN31_00	0x00
 #define GX_INTC_PEN63_32	0x04
 #define GX_INTC_NEN31_00	0x40
 #define GX_INTC_NEN63_32	0x44
 #define GX_INTC_NMASK31_00	0x50
 #define GX_INTC_NMASK63_32	0x54
 #define GX_INTC_SOURCE		0x60

 static void __iomem *reg_base;
 static struct irq_domain *root_domain;

 static int nr_irq = INTC_IRQS;

 /*
  * When controller support pulse signal, the PEN_reg will hold on signal
  * without software trigger.
  *
  * So, to support pulse signal we need to clear IFR_reg and the address of
  * IFR_offset is NEN_offset - 8.
  */
 static void irq_ck_mask_set_bit(struct irq_data *d)
 {
 	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 	struct irq_chip_type *ct = irq_data_get_chip_type(d);
 	unsigned long ifr = ct->regs.mask - 8;
 	u32 mask = d->mask;

 	irq_gc_lock(gc);
 	*ct->mask_cache |= mask;
 	irq_reg_writel(gc, *ct->mask_cache, ct->regs.mask);
 	irq_reg_writel(gc, irq_reg_readl(gc, ifr) & ~mask, ifr);
 	irq_gc_unlock(gc);
 }

 static void __init ck_set_gc(struct device_node *node, void __iomem *reg_base,
 			     u32 mask_reg, u32 irq_base)
 {
 	struct irq_chip_generic *gc;

 	gc = irq_get_domain_generic_chip(root_domain, irq_base);
 	gc->reg_base = reg_base;
 	gc->chip_types[0].regs.mask = mask_reg;
 	gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit;
 	gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit;

 	if (of_find_property(node, "csky,support-pulse-signal", NULL))
 		gc->chip_types[0].chip.irq_unmask = irq_ck_mask_set_bit;
 }

 static inline u32 build_channel_val(u32 idx, u32 magic)
 {
 	u32 res;

 	/*
 	 * Set the same index for each channel
 	 */
 	res = idx | (idx << 8) | (idx << 16) | (idx << 24);

 	/*
 	 * Set the channel magic number in descending order.
 	 * The magic is 0x00010203 for ck-intc
 	 * The magic is 0x03020100 for gx6605s-intc
 	 */
 	return res | magic;
 }

 static inline void setup_irq_channel(u32 magic, void __iomem *reg_addr)
 {
 	u32 i;

 	/* Setup 64 channel slots */
 	for (i = 0; i < INTC_IRQS; i += 4)
 		writel(build_channel_val(i, magic), reg_addr + i);
 }

 static int __init
 ck_intc_init_comm(struct device_node *node, struct device_node *parent)
 {
 	int ret;

 	if (parent) {
 		pr_err("C-SKY Intc not a root irq controller\n");
 		return -EINVAL;
 	}

 	reg_base = of_iomap(node, 0);
 	if (!reg_base) {
 		pr_err("C-SKY Intc unable to map: %p.\n", node);
 		return -EINVAL;
 	}

 	root_domain = irq_domain_add_linear(node, nr_irq,
 					    &irq_generic_chip_ops, NULL);
 	if (!root_domain) {
 		pr_err("C-SKY Intc irq_domain_add failed.\n");
 		return -ENOMEM;
 	}

 	ret = irq_alloc_domain_generic_chips(root_domain, 32, 1,
 			"csky_intc", handle_level_irq,
 			IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN, 0, 0);
 	if (ret) {
 		pr_err("C-SKY Intc irq_alloc_gc failed.\n");
 		return -ENOMEM;
 	}

 	return 0;
 }

 static inline bool handle_irq_perbit(struct pt_regs *regs, u32 hwirq,
 				     u32 irq_base)
 {
 	if (hwirq == 0)
 		return 0;

 	generic_handle_domain_irq(root_domain, irq_base + __fls(hwirq));

 	return 1;
 }

 /* gx6605s 64 irqs interrupt controller */
 static void gx_irq_handler(struct pt_regs *regs)
 {
 	bool ret;

 retry:
 	ret = handle_irq_perbit(regs,
 			readl(reg_base + GX_INTC_PEN63_32), 32);
 	if (ret)
 		goto retry;

 	ret = handle_irq_perbit(regs,
 			readl(reg_base + GX_INTC_PEN31_00), 0);
 	if (ret)
 		goto retry;
 }

 static int __init
 gx_intc_init(struct device_node *node, struct device_node *parent)
 {
 	int ret;

 	ret = ck_intc_init_comm(node, parent);
 	if (ret)
 		return ret;

 	/*
 	 * Initial enable reg to disable all interrupts
 	 */
 	writel(0x0, reg_base + GX_INTC_NEN31_00);
 	writel(0x0, reg_base + GX_INTC_NEN63_32);

 	/*
 	 * Initial mask reg with all unmasked, because we only use enable reg
 	 */
 	writel(0x0, reg_base + GX_INTC_NMASK31_00);
 	writel(0x0, reg_base + GX_INTC_NMASK63_32);

 	setup_irq_channel(0x03020100, reg_base + GX_INTC_SOURCE);

 	ck_set_gc(node, reg_base, GX_INTC_NEN31_00, 0);
 	ck_set_gc(node, reg_base, GX_INTC_NEN63_32, 32);

 	set_handle_irq(gx_irq_handler);

 	return 0;
 }
 IRQCHIP_DECLARE(csky_gx6605s_intc, "csky,gx6605s-intc", gx_intc_init);

 /*
  * C-SKY simple 64 irqs interrupt controller, dual-together could support 128
  * irqs.
  */
 static void ck_irq_handler(struct pt_regs *regs)
 {
 	bool ret;
 	void __iomem *reg_pen_lo = reg_base + CK_INTC_PEN31_00;
 	void __iomem *reg_pen_hi = reg_base + CK_INTC_PEN63_32;

 retry:
 	/* handle 0 - 63 irqs */
 	ret = handle_irq_perbit(regs, readl(reg_pen_hi), 32);
 	if (ret)
 		goto retry;

 	ret = handle_irq_perbit(regs, readl(reg_pen_lo), 0);
 	if (ret)
 		goto retry;

 	if (nr_irq == INTC_IRQS)
 		return;

 	/* handle 64 - 127 irqs */
 	ret = handle_irq_perbit(regs,
 			readl(reg_pen_hi + CK_INTC_DUAL_BASE), 96);
 	if (ret)
 		goto retry;

 	ret = handle_irq_perbit(regs,
 			readl(reg_pen_lo + CK_INTC_DUAL_BASE), 64);
 	if (ret)
 		goto retry;
 }

 static int __init
 ck_intc_init(struct device_node *node, struct device_node *parent)
 {
 	int ret;

 	ret = ck_intc_init_comm(node, parent);
 	if (ret)
 		return ret;

 	/* Initial enable reg to disable all interrupts */
 	writel(0, reg_base + CK_INTC_NEN31_00);
 	writel(0, reg_base + CK_INTC_NEN63_32);

 	/* Enable irq intc */
 	writel(BIT(31), reg_base + CK_INTC_ICR);

 	ck_set_gc(node, reg_base, CK_INTC_NEN31_00, 0);
 	ck_set_gc(node, reg_base, CK_INTC_NEN63_32, 32);

 	setup_irq_channel(0x00010203, reg_base + CK_INTC_SOURCE);

 	set_handle_irq(ck_irq_handler);

 	return 0;
 }
 IRQCHIP_DECLARE(ck_intc, "csky,apb-intc", ck_intc_init);

 static int __init
 ck_dual_intc_init(struct device_node *node, struct device_node *parent)
 {
 	int ret;

 	/* dual-apb-intc up to 128 irq sources*/
 	nr_irq = INTC_IRQS * 2;

 	ret = ck_intc_init(node, parent);
 	if (ret)
 		return ret;

 	/* Initial enable reg to disable all interrupts */
 	writel(0, reg_base + CK_INTC_NEN31_00 + CK_INTC_DUAL_BASE);
 	writel(0, reg_base + CK_INTC_NEN63_32 + CK_INTC_DUAL_BASE);

 	ck_set_gc(node, reg_base + CK_INTC_DUAL_BASE, CK_INTC_NEN31_00, 64);
 	ck_set_gc(node, reg_base + CK_INTC_DUAL_BASE, CK_INTC_NEN63_32, 96);

 	setup_irq_channel(0x00010203,
 			  reg_base + CK_INTC_SOURCE + CK_INTC_DUAL_BASE);

 	return 0;
 }
 IRQCHIP_DECLARE(ck_dual_intc, "csky,dual-apb-intc", ck_dual_intc_init);
	// SPDX-License-Identifier: GPL-2.0
	// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.

	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/of.h>
	#include <linux/of_address.h>
	#include <linux/module.h>
	#include <linux/irqdomain.h>
	#include <linux/irqchip.h>
	#include <linux/irq.h>
	#include <linux/interrupt.h>
	#include <linux/io.h>
	#include <asm/irq.h>

	#define INTC_IRQS 64

	#define CK_INTC_ICR 0x00
	#define CK_INTC_PEN31_00 0x14
	#define CK_INTC_PEN63_32 0x2c
	#define CK_INTC_NEN31_00 0x10
	#define CK_INTC_NEN63_32 0x28
	#define CK_INTC_SOURCE 0x40
	#define CK_INTC_DUAL_BASE 0x100

	#define GX_INTC_PEN31_00 0x00
	#define GX_INTC_PEN63_32 0x04
	#define GX_INTC_NEN31_00 0x40
	#define GX_INTC_NEN63_32 0x44
	#define GX_INTC_NMASK31_00 0x50
	#define GX_INTC_NMASK63_32 0x54
	#define GX_INTC_SOURCE 0x60

	static void __iomem *reg_base;
	static struct irq_domain *root_domain;

	static int nr_irq = INTC_IRQS;

	/*
	* When controller support pulse signal, the PEN_reg will hold on signal
	* without software trigger.
	*
	* So, to support pulse signal we need to clear IFR_reg and the address of
	* IFR_offset is NEN_offset - 8.
	*/
	static void irq_ck_mask_set_bit(struct irq_data *d)
	{
	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
	struct irq_chip_type *ct = irq_data_get_chip_type(d);
	unsigned long ifr = ct->regs.mask - 8;
	u32 mask = d->mask;

	irq_gc_lock(gc);
	*ct->mask_cache \|= mask;
	irq_reg_writel(gc, *ct->mask_cache, ct->regs.mask);
	irq_reg_writel(gc, irq_reg_readl(gc, ifr) & ~mask, ifr);
	irq_gc_unlock(gc);
	}

	static void __init ck_set_gc(struct device_node node, void __iomem reg_base,
	u32 mask_reg, u32 irq_base)
	{
	struct irq_chip_generic *gc;

	gc = irq_get_domain_generic_chip(root_domain, irq_base);
	gc->reg_base = reg_base;
	gc->chip_types[0].regs.mask = mask_reg;
	gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit;
	gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit;

	if (of_find_property(node, "csky,support-pulse-signal", NULL))
	gc->chip_types[0].chip.irq_unmask = irq_ck_mask_set_bit;
	}

	static inline u32 build_channel_val(u32 idx, u32 magic)
	{
	u32 res;

	/*
	* Set the same index for each channel
	*/
	res = idx \| (idx << 8) \| (idx << 16) \| (idx << 24);

	/*
	* Set the channel magic number in descending order.
	* The magic is 0x00010203 for ck-intc
	* The magic is 0x03020100 for gx6605s-intc
	*/
	return res \| magic;
	}

	static inline void setup_irq_channel(u32 magic, void __iomem *reg_addr)
	{
	u32 i;

	/* Setup 64 channel slots */
	for (i = 0; i < INTC_IRQS; i += 4)
	writel(build_channel_val(i, magic), reg_addr + i);
	}

	static int __init
	ck_intc_init_comm(struct device_node node, struct device_node parent)
	{
	int ret;

	if (parent) {
	pr_err("C-SKY Intc not a root irq controller\n");
	return -EINVAL;
	}

	reg_base = of_iomap(node, 0);
	if (!reg_base) {
	pr_err("C-SKY Intc unable to map: %p.\n", node);
	return -EINVAL;
	}

	root_domain = irq_domain_add_linear(node, nr_irq,
	&irq_generic_chip_ops, NULL);
	if (!root_domain) {
	pr_err("C-SKY Intc irq_domain_add failed.\n");
	return -ENOMEM;
	}

	ret = irq_alloc_domain_generic_chips(root_domain, 32, 1,
	"csky_intc", handle_level_irq,
	IRQ_NOREQUEST \| IRQ_NOPROBE \| IRQ_NOAUTOEN, 0, 0);
	if (ret) {
	pr_err("C-SKY Intc irq_alloc_gc failed.\n");
	return -ENOMEM;
	}

	return 0;
	}

	static inline bool handle_irq_perbit(struct pt_regs *regs, u32 hwirq,
	u32 irq_base)
	{
	if (hwirq == 0)
	return 0;

	generic_handle_domain_irq(root_domain, irq_base + __fls(hwirq));

	return 1;
	}

	/* gx6605s 64 irqs interrupt controller */
	static void gx_irq_handler(struct pt_regs *regs)
	{
	bool ret;

	retry:
	ret = handle_irq_perbit(regs,
	readl(reg_base + GX_INTC_PEN63_32), 32);
	if (ret)
	goto retry;

	ret = handle_irq_perbit(regs,
	readl(reg_base + GX_INTC_PEN31_00), 0);
	if (ret)
	goto retry;
	}

	static int __init
	gx_intc_init(struct device_node node, struct device_node parent)
	{
	int ret;

	ret = ck_intc_init_comm(node, parent);
	if (ret)
	return ret;

	/*
	* Initial enable reg to disable all interrupts
	*/
	writel(0x0, reg_base + GX_INTC_NEN31_00);
	writel(0x0, reg_base + GX_INTC_NEN63_32);

	/*
	* Initial mask reg with all unmasked, because we only use enable reg
	*/
	writel(0x0, reg_base + GX_INTC_NMASK31_00);
	writel(0x0, reg_base + GX_INTC_NMASK63_32);

	setup_irq_channel(0x03020100, reg_base + GX_INTC_SOURCE);

	ck_set_gc(node, reg_base, GX_INTC_NEN31_00, 0);
	ck_set_gc(node, reg_base, GX_INTC_NEN63_32, 32);

	set_handle_irq(gx_irq_handler);

	return 0;
	}
	IRQCHIP_DECLARE(csky_gx6605s_intc, "csky,gx6605s-intc", gx_intc_init);

	/*
	* C-SKY simple 64 irqs interrupt controller, dual-together could support 128
	* irqs.
	*/
	static void ck_irq_handler(struct pt_regs *regs)
	{
	bool ret;
	void __iomem *reg_pen_lo = reg_base + CK_INTC_PEN31_00;
	void __iomem *reg_pen_hi = reg_base + CK_INTC_PEN63_32;

	retry:
	/* handle 0 - 63 irqs */
	ret = handle_irq_perbit(regs, readl(reg_pen_hi), 32);
	if (ret)
	goto retry;

	ret = handle_irq_perbit(regs, readl(reg_pen_lo), 0);
	if (ret)
	goto retry;

	if (nr_irq == INTC_IRQS)
	return;

	/* handle 64 - 127 irqs */
	ret = handle_irq_perbit(regs,
	readl(reg_pen_hi + CK_INTC_DUAL_BASE), 96);
	if (ret)
	goto retry;

	ret = handle_irq_perbit(regs,
	readl(reg_pen_lo + CK_INTC_DUAL_BASE), 64);
	if (ret)
	goto retry;
	}

	static int __init
	ck_intc_init(struct device_node node, struct device_node parent)
	{
	int ret;

	ret = ck_intc_init_comm(node, parent);
	if (ret)
	return ret;

	/* Initial enable reg to disable all interrupts */
	writel(0, reg_base + CK_INTC_NEN31_00);
	writel(0, reg_base + CK_INTC_NEN63_32);

	/* Enable irq intc */
	writel(BIT(31), reg_base + CK_INTC_ICR);

	ck_set_gc(node, reg_base, CK_INTC_NEN31_00, 0);
	ck_set_gc(node, reg_base, CK_INTC_NEN63_32, 32);

	setup_irq_channel(0x00010203, reg_base + CK_INTC_SOURCE);

	set_handle_irq(ck_irq_handler);

	return 0;
	}
	IRQCHIP_DECLARE(ck_intc, "csky,apb-intc", ck_intc_init);

	static int __init
	ck_dual_intc_init(struct device_node node, struct device_node parent)
	{
	int ret;

	/* dual-apb-intc up to 128 irq sources*/
	nr_irq = INTC_IRQS * 2;

	ret = ck_intc_init(node, parent);
	if (ret)
	return ret;

	/* Initial enable reg to disable all interrupts */
	writel(0, reg_base + CK_INTC_NEN31_00 + CK_INTC_DUAL_BASE);
	writel(0, reg_base + CK_INTC_NEN63_32 + CK_INTC_DUAL_BASE);

	ck_set_gc(node, reg_base + CK_INTC_DUAL_BASE, CK_INTC_NEN31_00, 64);
	ck_set_gc(node, reg_base + CK_INTC_DUAL_BASE, CK_INTC_NEN63_32, 96);

	setup_irq_channel(0x00010203,
	reg_base + CK_INTC_SOURCE + CK_INTC_DUAL_BASE);

	return 0;
	}
	IRQCHIP_DECLARE(ck_dual_intc, "csky,dual-apb-intc", ck_dual_intc_init);