linux/drivers/irqchip/irq-ixp4xx.c
Linus Walleij c83227a5d0 irq/gpio: ixp4xx: Drop boardfile probe path
The boardfiles for IXP4xx have been deleted. Delete all the
quirks and code dealing with that boot path and rely solely on
device tree boot.

Fix some missing static keywords that the kernel test robot
was complaining about while we're at it.

Cc: Bartosz Golaszewski <brgl@bgdev.pl>
Acked-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
2022-04-25 20:53:18 +02:00

286 lines
7.5 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* irqchip for the IXP4xx interrupt controller
* Copyright (C) 2019 Linus Walleij <linus.walleij@linaro.org>
*
* Based on arch/arm/mach-ixp4xx/common.c
* Copyright 2002 (C) Intel Corporation
* Copyright 2003-2004 (C) MontaVista, Software, Inc.
* Copyright (C) Deepak Saxena <dsaxena@plexity.net>
*/
#include <linux/bitops.h>
#include <linux/gpio/driver.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/irqchip.h>
#include <linux/irqdomain.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/cpu.h>
#include <asm/exception.h>
#include <asm/mach/irq.h>
#define IXP4XX_ICPR 0x00 /* Interrupt Status */
#define IXP4XX_ICMR 0x04 /* Interrupt Enable */
#define IXP4XX_ICLR 0x08 /* Interrupt IRQ/FIQ Select */
#define IXP4XX_ICIP 0x0C /* IRQ Status */
#define IXP4XX_ICFP 0x10 /* FIQ Status */
#define IXP4XX_ICHR 0x14 /* Interrupt Priority */
#define IXP4XX_ICIH 0x18 /* IRQ Highest Pri Int */
#define IXP4XX_ICFH 0x1C /* FIQ Highest Pri Int */
/* IXP43x and IXP46x-only */
#define IXP4XX_ICPR2 0x20 /* Interrupt Status 2 */
#define IXP4XX_ICMR2 0x24 /* Interrupt Enable 2 */
#define IXP4XX_ICLR2 0x28 /* Interrupt IRQ/FIQ Select 2 */
#define IXP4XX_ICIP2 0x2C /* IRQ Status */
#define IXP4XX_ICFP2 0x30 /* FIQ Status */
#define IXP4XX_ICEEN 0x34 /* Error High Pri Enable */
/**
* struct ixp4xx_irq - state container for the Faraday IRQ controller
* @irqbase: IRQ controller memory base in virtual memory
* @is_356: if this is an IXP43x, IXP45x or IX46x SoC (with 64 IRQs)
* @irqchip: irqchip for this instance
* @domain: IRQ domain for this instance
*/
struct ixp4xx_irq {
void __iomem *irqbase;
bool is_356;
struct irq_chip irqchip;
struct irq_domain *domain;
};
/* Local static state container */
static struct ixp4xx_irq ixirq;
/* GPIO Clocks */
#define IXP4XX_GPIO_CLK_0 14
#define IXP4XX_GPIO_CLK_1 15
static int ixp4xx_set_irq_type(struct irq_data *d, unsigned int type)
{
/* All are level active high (asserted) here */
if (type != IRQ_TYPE_LEVEL_HIGH)
return -EINVAL;
return 0;
}
static void ixp4xx_irq_mask(struct irq_data *d)
{
struct ixp4xx_irq *ixi = irq_data_get_irq_chip_data(d);
u32 val;
if (ixi->is_356 && d->hwirq >= 32) {
val = __raw_readl(ixi->irqbase + IXP4XX_ICMR2);
val &= ~BIT(d->hwirq - 32);
__raw_writel(val, ixi->irqbase + IXP4XX_ICMR2);
} else {
val = __raw_readl(ixi->irqbase + IXP4XX_ICMR);
val &= ~BIT(d->hwirq);
__raw_writel(val, ixi->irqbase + IXP4XX_ICMR);
}
}
/*
* Level triggered interrupts on GPIO lines can only be cleared when the
* interrupt condition disappears.
*/
static void ixp4xx_irq_unmask(struct irq_data *d)
{
struct ixp4xx_irq *ixi = irq_data_get_irq_chip_data(d);
u32 val;
if (ixi->is_356 && d->hwirq >= 32) {
val = __raw_readl(ixi->irqbase + IXP4XX_ICMR2);
val |= BIT(d->hwirq - 32);
__raw_writel(val, ixi->irqbase + IXP4XX_ICMR2);
} else {
val = __raw_readl(ixi->irqbase + IXP4XX_ICMR);
val |= BIT(d->hwirq);
__raw_writel(val, ixi->irqbase + IXP4XX_ICMR);
}
}
static asmlinkage void __exception_irq_entry
ixp4xx_handle_irq(struct pt_regs *regs)
{
struct ixp4xx_irq *ixi = &ixirq;
unsigned long status;
int i;
status = __raw_readl(ixi->irqbase + IXP4XX_ICIP);
for_each_set_bit(i, &status, 32)
generic_handle_domain_irq(ixi->domain, i);
/*
* IXP465/IXP435 has an upper IRQ status register
*/
if (ixi->is_356) {
status = __raw_readl(ixi->irqbase + IXP4XX_ICIP2);
for_each_set_bit(i, &status, 32)
generic_handle_domain_irq(ixi->domain, i + 32);
}
}
static int ixp4xx_irq_domain_translate(struct irq_domain *domain,
struct irq_fwspec *fwspec,
unsigned long *hwirq,
unsigned int *type)
{
/* We support standard DT translation */
if (is_of_node(fwspec->fwnode) && fwspec->param_count == 2) {
*hwirq = fwspec->param[0];
*type = fwspec->param[1];
return 0;
}
if (is_fwnode_irqchip(fwspec->fwnode)) {
if (fwspec->param_count != 2)
return -EINVAL;
*hwirq = fwspec->param[0];
*type = fwspec->param[1];
WARN_ON(*type == IRQ_TYPE_NONE);
return 0;
}
return -EINVAL;
}
static int ixp4xx_irq_domain_alloc(struct irq_domain *d,
unsigned int irq, unsigned int nr_irqs,
void *data)
{
struct ixp4xx_irq *ixi = d->host_data;
irq_hw_number_t hwirq;
unsigned int type = IRQ_TYPE_NONE;
struct irq_fwspec *fwspec = data;
int ret;
int i;
ret = ixp4xx_irq_domain_translate(d, fwspec, &hwirq, &type);
if (ret)
return ret;
for (i = 0; i < nr_irqs; i++) {
/*
* TODO: after converting IXP4xx to only device tree, set
* handle_bad_irq as default handler and assume all consumers
* call .set_type() as this is provided in the second cell in
* the device tree phandle.
*/
irq_domain_set_info(d,
irq + i,
hwirq + i,
&ixi->irqchip,
ixi,
handle_level_irq,
NULL, NULL);
irq_set_probe(irq + i);
}
return 0;
}
/*
* This needs to be a hierarchical irqdomain to work well with the
* GPIO irqchip (which is lower in the hierarchy)
*/
static const struct irq_domain_ops ixp4xx_irqdomain_ops = {
.translate = ixp4xx_irq_domain_translate,
.alloc = ixp4xx_irq_domain_alloc,
.free = irq_domain_free_irqs_common,
};
/**
* ixp4x_irq_setup() - Common setup code for the IXP4xx interrupt controller
* @ixi: State container
* @irqbase: Virtual memory base for the interrupt controller
* @fwnode: Corresponding fwnode abstraction for this controller
* @is_356: if this is an IXP43x, IXP45x or IXP46x SoC variant
*/
static int __init ixp4xx_irq_setup(struct ixp4xx_irq *ixi,
void __iomem *irqbase,
struct fwnode_handle *fwnode,
bool is_356)
{
int nr_irqs;
ixi->irqbase = irqbase;
ixi->is_356 = is_356;
/* Route all sources to IRQ instead of FIQ */
__raw_writel(0x0, ixi->irqbase + IXP4XX_ICLR);
/* Disable all interrupts */
__raw_writel(0x0, ixi->irqbase + IXP4XX_ICMR);
if (is_356) {
/* Route upper 32 sources to IRQ instead of FIQ */
__raw_writel(0x0, ixi->irqbase + IXP4XX_ICLR2);
/* Disable upper 32 interrupts */
__raw_writel(0x0, ixi->irqbase + IXP4XX_ICMR2);
nr_irqs = 64;
} else {
nr_irqs = 32;
}
ixi->irqchip.name = "IXP4xx";
ixi->irqchip.irq_mask = ixp4xx_irq_mask;
ixi->irqchip.irq_unmask = ixp4xx_irq_unmask;
ixi->irqchip.irq_set_type = ixp4xx_set_irq_type;
ixi->domain = irq_domain_create_linear(fwnode, nr_irqs,
&ixp4xx_irqdomain_ops,
ixi);
if (!ixi->domain) {
pr_crit("IXP4XX: can not add primary irqdomain\n");
return -ENODEV;
}
set_handle_irq(ixp4xx_handle_irq);
return 0;
}
static int __init ixp4xx_of_init_irq(struct device_node *np,
struct device_node *parent)
{
struct ixp4xx_irq *ixi = &ixirq;
void __iomem *base;
struct fwnode_handle *fwnode;
bool is_356;
int ret;
base = of_iomap(np, 0);
if (!base) {
pr_crit("IXP4XX: could not ioremap interrupt controller\n");
return -ENODEV;
}
fwnode = of_node_to_fwnode(np);
/* These chip variants have 64 interrupts */
is_356 = of_device_is_compatible(np, "intel,ixp43x-interrupt") ||
of_device_is_compatible(np, "intel,ixp45x-interrupt") ||
of_device_is_compatible(np, "intel,ixp46x-interrupt");
ret = ixp4xx_irq_setup(ixi, base, fwnode, is_356);
if (ret)
pr_crit("IXP4XX: failed to set up irqchip\n");
return ret;
}
IRQCHIP_DECLARE(ixp42x, "intel,ixp42x-interrupt",
ixp4xx_of_init_irq);
IRQCHIP_DECLARE(ixp43x, "intel,ixp43x-interrupt",
ixp4xx_of_init_irq);
IRQCHIP_DECLARE(ixp45x, "intel,ixp45x-interrupt",
ixp4xx_of_init_irq);
IRQCHIP_DECLARE(ixp46x, "intel,ixp46x-interrupt",
ixp4xx_of_init_irq);