drivers/irqchip/irq-vt8500.c - kernel/msm-4.19 - Gitiles

 /*
  *  arch/arm/mach-vt8500/irq.c
  *
  *  Copyright (C) 2012 Tony Prisk <linux@prisktech.co.nz>
  *  Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
  *
  * 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.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */

 /*
  * This file is copied and modified from the original irq.c provided by
  * Alexey Charkov. Minor changes have been made for Device Tree Support.
  */

 #include <linux/slab.h>
 #include <linux/io.h>
 #include <linux/irq.h>
 #include <linux/irqchip.h>
 #include <linux/irqdomain.h>
 #include <linux/interrupt.h>
 #include <linux/bitops.h>

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

 #include <asm/irq.h>
 #include <asm/exception.h>
 #include <asm/mach/irq.h>

 #define VT8500_ICPC_IRQ		0x20
 #define VT8500_ICPC_FIQ		0x24
 #define VT8500_ICDC		0x40		/* Destination Control 64*u32 */
 #define VT8500_ICIS		0x80		/* Interrupt status, 16*u32 */

 /* ICPC */
 #define ICPC_MASK		0x3F
 #define ICPC_ROTATE		BIT(6)

 /* IC_DCTR */
 #define ICDC_IRQ		0x00
 #define ICDC_FIQ		0x01
 #define ICDC_DSS0		0x02
 #define ICDC_DSS1		0x03
 #define ICDC_DSS2		0x04
 #define ICDC_DSS3		0x05
 #define ICDC_DSS4		0x06
 #define ICDC_DSS5		0x07

 #define VT8500_INT_DISABLE	0
 #define VT8500_INT_ENABLE	BIT(3)

 #define VT8500_TRIGGER_HIGH	0
 #define VT8500_TRIGGER_RISING	BIT(5)
 #define VT8500_TRIGGER_FALLING	BIT(6)
 #define VT8500_EDGE		( VT8500_TRIGGER_RISING \
 				| VT8500_TRIGGER_FALLING)

 /* vt8500 has 1 intc, wm8505 and wm8650 have 2 */
 #define VT8500_INTC_MAX		2

 struct vt8500_irq_data {
 	void __iomem 		*base;		/* IO Memory base address */
 	struct irq_domain	*domain;	/* Domain for this controller */
 };

 /* Global variable for accessing io-mem addresses */
 static struct vt8500_irq_data intc[VT8500_INTC_MAX];
 static u32 active_cnt = 0;

 static void vt8500_irq_mask(struct irq_data *d)
 {
 	struct vt8500_irq_data *priv = d->domain->host_data;
 	void __iomem *base = priv->base;
 	void __iomem *stat_reg = base + VT8500_ICIS + (d->hwirq < 32 ? 0 : 4);
 	u8 edge, dctr;
 	u32 status;

 	edge = readb(base + VT8500_ICDC + d->hwirq) & VT8500_EDGE;
 	if (edge) {
 		status = readl(stat_reg);

 		status |= (1 << (d->hwirq & 0x1f));
 		writel(status, stat_reg);
 	} else {
 		dctr = readb(base + VT8500_ICDC + d->hwirq);
 		dctr &= ~VT8500_INT_ENABLE;
 		writeb(dctr, base + VT8500_ICDC + d->hwirq);
 	}
 }

 static void vt8500_irq_unmask(struct irq_data *d)
 {
 	struct vt8500_irq_data *priv = d->domain->host_data;
 	void __iomem *base = priv->base;
 	u8 dctr;

 	dctr = readb(base + VT8500_ICDC + d->hwirq);
 	dctr |= VT8500_INT_ENABLE;
 	writeb(dctr, base + VT8500_ICDC + d->hwirq);
 }

 static int vt8500_irq_set_type(struct irq_data *d, unsigned int flow_type)
 {
 	struct vt8500_irq_data *priv = d->domain->host_data;
 	void __iomem *base = priv->base;
 	u8 dctr;

 	dctr = readb(base + VT8500_ICDC + d->hwirq);
 	dctr &= ~VT8500_EDGE;

 	switch (flow_type) {
 	case IRQF_TRIGGER_LOW:
 		return -EINVAL;
 	case IRQF_TRIGGER_HIGH:
 		dctr |= VT8500_TRIGGER_HIGH;
 		irq_set_handler_locked(d, handle_level_irq);
 		break;
 	case IRQF_TRIGGER_FALLING:
 		dctr |= VT8500_TRIGGER_FALLING;
 		irq_set_handler_locked(d, handle_edge_irq);
 		break;
 	case IRQF_TRIGGER_RISING:
 		dctr |= VT8500_TRIGGER_RISING;
 		irq_set_handler_locked(d, handle_edge_irq);
 		break;
 	}
 	writeb(dctr, base + VT8500_ICDC + d->hwirq);

 	return 0;
 }

 static struct irq_chip vt8500_irq_chip = {
 	.name = "vt8500",
 	.irq_ack = vt8500_irq_mask,
 	.irq_mask = vt8500_irq_mask,
 	.irq_unmask = vt8500_irq_unmask,
 	.irq_set_type = vt8500_irq_set_type,
 };

 static void __init vt8500_init_irq_hw(void __iomem *base)
 {
 	u32 i;

 	/* Enable rotating priority for IRQ */
 	writel(ICPC_ROTATE, base + VT8500_ICPC_IRQ);
 	writel(0x00, base + VT8500_ICPC_FIQ);

 	/* Disable all interrupts and route them to IRQ */
 	for (i = 0; i < 64; i++)
 		writeb(VT8500_INT_DISABLE | ICDC_IRQ, base + VT8500_ICDC + i);
 }

 static int vt8500_irq_map(struct irq_domain *h, unsigned int virq,
 							irq_hw_number_t hw)
 {
 	irq_set_chip_and_handler(virq, &vt8500_irq_chip, handle_level_irq);
 	set_irq_flags(virq, IRQF_VALID);

 	return 0;
 }

 static const struct irq_domain_ops vt8500_irq_domain_ops = {
 	.map = vt8500_irq_map,
 	.xlate = irq_domain_xlate_onecell,
 };

 static void __exception_irq_entry vt8500_handle_irq(struct pt_regs *regs)
 {
 	u32 stat, i;
 	int irqnr;
 	void __iomem *base;

 	/* Loop through each active controller */
 	for (i=0; i<active_cnt; i++) {
 		base = intc[i].base;
 		irqnr = readl_relaxed(base) & 0x3F;
 		/*
 		  Highest Priority register default = 63, so check that this
 		  is a real interrupt by checking the status register
 		*/
 		if (irqnr == 63) {
 			stat = readl_relaxed(base + VT8500_ICIS + 4);
 			if (!(stat & BIT(31)))
 				continue;
 		}

 		handle_domain_irq(intc[i].domain, irqnr, regs);
 	}
 }

 static int __init vt8500_irq_init(struct device_node *node,
 				  struct device_node *parent)
 {
 	int irq, i;
 	struct device_node *np = node;

 	if (active_cnt == VT8500_INTC_MAX) {
 		pr_err("%s: Interrupt controllers > VT8500_INTC_MAX\n",
 								__func__);
 		goto out;
 	}

 	intc[active_cnt].base = of_iomap(np, 0);
 	intc[active_cnt].domain = irq_domain_add_linear(node, 64,
 			&vt8500_irq_domain_ops,	&intc[active_cnt]);

 	if (!intc[active_cnt].base) {
 		pr_err("%s: Unable to map IO memory\n", __func__);
 		goto out;
 	}

 	if (!intc[active_cnt].domain) {
 		pr_err("%s: Unable to add irq domain!\n", __func__);
 		goto out;
 	}

 	set_handle_irq(vt8500_handle_irq);

 	vt8500_init_irq_hw(intc[active_cnt].base);

 	pr_info("vt8500-irq: Added interrupt controller\n");

 	active_cnt++;

 	/* check if this is a slaved controller */
 	if (of_irq_count(np) != 0) {
 		/* check that we have the correct number of interrupts */
 		if (of_irq_count(np) != 8) {
 			pr_err("%s: Incorrect IRQ map for slaved controller\n",
 					__func__);
 			return -EINVAL;
 		}

 		for (i = 0; i < 8; i++) {
 			irq = irq_of_parse_and_map(np, i);
 			enable_irq(irq);
 		}

 		pr_info("vt8500-irq: Enabled slave->parent interrupts\n");
 	}
 out:
 	return 0;
 }

 IRQCHIP_DECLARE(vt8500_irq, "via,vt8500-intc", vt8500_irq_init);
	/*
	* arch/arm/mach-vt8500/irq.c
	*
	* Copyright (C) 2012 Tony Prisk <linux@prisktech.co.nz>
	* Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
	*
	* 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.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/

	/*
	* This file is copied and modified from the original irq.c provided by
	* Alexey Charkov. Minor changes have been made for Device Tree Support.
	*/

	#include <linux/slab.h>
	#include <linux/io.h>
	#include <linux/irq.h>
	#include <linux/irqchip.h>
	#include <linux/irqdomain.h>
	#include <linux/interrupt.h>
	#include <linux/bitops.h>

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

	#include <asm/irq.h>
	#include <asm/exception.h>
	#include <asm/mach/irq.h>

	#define VT8500_ICPC_IRQ 0x20
	#define VT8500_ICPC_FIQ 0x24
	#define VT8500_ICDC 0x40 /* Destination Control 64u32 /
	#define VT8500_ICIS 0x80 /* Interrupt status, 16u32 /

	/* ICPC */
	#define ICPC_MASK 0x3F
	#define ICPC_ROTATE BIT(6)

	/* IC_DCTR */
	#define ICDC_IRQ 0x00
	#define ICDC_FIQ 0x01
	#define ICDC_DSS0 0x02
	#define ICDC_DSS1 0x03
	#define ICDC_DSS2 0x04
	#define ICDC_DSS3 0x05
	#define ICDC_DSS4 0x06
	#define ICDC_DSS5 0x07

	#define VT8500_INT_DISABLE 0
	#define VT8500_INT_ENABLE BIT(3)

	#define VT8500_TRIGGER_HIGH 0
	#define VT8500_TRIGGER_RISING BIT(5)
	#define VT8500_TRIGGER_FALLING BIT(6)
	#define VT8500_EDGE ( VT8500_TRIGGER_RISING \
	\| VT8500_TRIGGER_FALLING)

	/* vt8500 has 1 intc, wm8505 and wm8650 have 2 */
	#define VT8500_INTC_MAX 2

	struct vt8500_irq_data {
	void __iomem base; / IO Memory base address */
	struct irq_domain domain; / Domain for this controller */
	};

	/* Global variable for accessing io-mem addresses */
	static struct vt8500_irq_data intc[VT8500_INTC_MAX];
	static u32 active_cnt = 0;

	static void vt8500_irq_mask(struct irq_data *d)
	{
	struct vt8500_irq_data *priv = d->domain->host_data;
	void __iomem *base = priv->base;
	void __iomem *stat_reg = base + VT8500_ICIS + (d->hwirq < 32 ? 0 : 4);
	u8 edge, dctr;
	u32 status;

	edge = readb(base + VT8500_ICDC + d->hwirq) & VT8500_EDGE;
	if (edge) {
	status = readl(stat_reg);

	status \|= (1 << (d->hwirq & 0x1f));
	writel(status, stat_reg);
	} else {
	dctr = readb(base + VT8500_ICDC + d->hwirq);
	dctr &= ~VT8500_INT_ENABLE;
	writeb(dctr, base + VT8500_ICDC + d->hwirq);
	}
	}

	static void vt8500_irq_unmask(struct irq_data *d)
	{
	struct vt8500_irq_data *priv = d->domain->host_data;
	void __iomem *base = priv->base;
	u8 dctr;

	dctr = readb(base + VT8500_ICDC + d->hwirq);
	dctr \|= VT8500_INT_ENABLE;
	writeb(dctr, base + VT8500_ICDC + d->hwirq);
	}

	static int vt8500_irq_set_type(struct irq_data *d, unsigned int flow_type)
	{
	struct vt8500_irq_data *priv = d->domain->host_data;
	void __iomem *base = priv->base;
	u8 dctr;

	dctr = readb(base + VT8500_ICDC + d->hwirq);
	dctr &= ~VT8500_EDGE;

	switch (flow_type) {
	case IRQF_TRIGGER_LOW:
	return -EINVAL;
	case IRQF_TRIGGER_HIGH:
	dctr \|= VT8500_TRIGGER_HIGH;
	irq_set_handler_locked(d, handle_level_irq);
	break;
	case IRQF_TRIGGER_FALLING:
	dctr \|= VT8500_TRIGGER_FALLING;
	irq_set_handler_locked(d, handle_edge_irq);
	break;
	case IRQF_TRIGGER_RISING:
	dctr \|= VT8500_TRIGGER_RISING;
	irq_set_handler_locked(d, handle_edge_irq);
	break;
	}
	writeb(dctr, base + VT8500_ICDC + d->hwirq);

	return 0;
	}

	static struct irq_chip vt8500_irq_chip = {
	.name = "vt8500",
	.irq_ack = vt8500_irq_mask,
	.irq_mask = vt8500_irq_mask,
	.irq_unmask = vt8500_irq_unmask,
	.irq_set_type = vt8500_irq_set_type,
	};

	static void __init vt8500_init_irq_hw(void __iomem *base)
	{
	u32 i;

	/* Enable rotating priority for IRQ */
	writel(ICPC_ROTATE, base + VT8500_ICPC_IRQ);
	writel(0x00, base + VT8500_ICPC_FIQ);

	/* Disable all interrupts and route them to IRQ */
	for (i = 0; i < 64; i++)
	writeb(VT8500_INT_DISABLE \| ICDC_IRQ, base + VT8500_ICDC + i);
	}

	static int vt8500_irq_map(struct irq_domain *h, unsigned int virq,
	irq_hw_number_t hw)
	{
	irq_set_chip_and_handler(virq, &vt8500_irq_chip, handle_level_irq);
	set_irq_flags(virq, IRQF_VALID);

	return 0;
	}

	static const struct irq_domain_ops vt8500_irq_domain_ops = {
	.map = vt8500_irq_map,
	.xlate = irq_domain_xlate_onecell,
	};

	static void __exception_irq_entry vt8500_handle_irq(struct pt_regs *regs)
	{
	u32 stat, i;
	int irqnr;
	void __iomem *base;

	/* Loop through each active controller */
	for (i=0; i<active_cnt; i++) {
	base = intc[i].base;
	irqnr = readl_relaxed(base) & 0x3F;
	/*
	Highest Priority register default = 63, so check that this
	is a real interrupt by checking the status register
	*/
	if (irqnr == 63) {
	stat = readl_relaxed(base + VT8500_ICIS + 4);
	if (!(stat & BIT(31)))
	continue;
	}

	handle_domain_irq(intc[i].domain, irqnr, regs);
	}
	}

	static int __init vt8500_irq_init(struct device_node *node,
	struct device_node *parent)
	{
	int irq, i;
	struct device_node *np = node;

	if (active_cnt == VT8500_INTC_MAX) {
	pr_err("%s: Interrupt controllers > VT8500_INTC_MAX\n",
	__func__);
	goto out;
	}

	intc[active_cnt].base = of_iomap(np, 0);
	intc[active_cnt].domain = irq_domain_add_linear(node, 64,
	&vt8500_irq_domain_ops, &intc[active_cnt]);

	if (!intc[active_cnt].base) {
	pr_err("%s: Unable to map IO memory\n", __func__);
	goto out;
	}

	if (!intc[active_cnt].domain) {
	pr_err("%s: Unable to add irq domain!\n", __func__);
	goto out;
	}

	set_handle_irq(vt8500_handle_irq);

	vt8500_init_irq_hw(intc[active_cnt].base);

	pr_info("vt8500-irq: Added interrupt controller\n");

	active_cnt++;

	/* check if this is a slaved controller */
	if (of_irq_count(np) != 0) {
	/* check that we have the correct number of interrupts */
	if (of_irq_count(np) != 8) {
	pr_err("%s: Incorrect IRQ map for slaved controller\n",
	__func__);
	return -EINVAL;
	}

	for (i = 0; i < 8; i++) {
	irq = irq_of_parse_and_map(np, i);
	enable_irq(irq);
	}

	pr_info("vt8500-irq: Enabled slave->parent interrupts\n");
	}
	out:
	return 0;
	}

	IRQCHIP_DECLARE(vt8500_irq, "via,vt8500-intc", vt8500_irq_init);