irqchip/mchp-eic: Add support for the Microchip EIC
Add support for Microchip External Interrupt Controller. The controller supports 2 external interrupt lines. For every external input there is a connection to GIC. The interrupt controllers contains only 4 registers: - EIC_GFCS (read only): which indicates that glitch filter configuration is ready (not addressed in this implementation) - EIC_SCFG0R, EIC_SCFG1R (read, write): allows per interrupt specific settings: enable, polarity/edge settings, glitch filter settings - EIC_WPMR, EIC_WPSR: enables write protection mode specific settings (which are architecture specific) for the controller and are not addressed in this implementation Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20210927063657.2157676-3-claudiu.beznea@microchip.com
This commit is contained in:
Claudiu Beznea
Marc Zyngier
parent
36179af21c
commit
00fa3461c8
@ -12254,6 +12254,12 @@ L: linux-crypto@vger.kernel.org
|
||||
S: Maintained
|
||||
F: drivers/crypto/atmel-ecc.*
|
||||
|
||||
MICROCHIP EIC DRIVER
|
||||
M: Claudiu Beznea <claudiu.beznea@microchip.com>
|
||||
L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
|
||||
S: Supported
|
||||
F: drivers/irqchip/irq-mchp-eic.c
|
||||
|
||||
MICROCHIP I2C DRIVER
|
||||
M: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
|
||||
L: linux-i2c@vger.kernel.org
|
||||
|
||||
@ -602,4 +602,12 @@ config APPLE_AIC
|
||||
Support for the Apple Interrupt Controller found on Apple Silicon SoCs,
|
||||
such as the M1.
|
||||
|
||||
config MCHP_EIC
|
||||
bool "Microchip External Interrupt Controller"
|
||||
depends on ARCH_AT91 || COMPILE_TEST
|
||||
select IRQ_DOMAIN
|
||||
select IRQ_DOMAIN_HIERARCHY
|
||||
help
|
||||
Support for Microchip External Interrupt Controller.
|
||||
|
||||
endmenu
|
||||
|
||||
@ -116,3 +116,4 @@ obj-$(CONFIG_MACH_REALTEK_RTL) += irq-realtek-rtl.o
|
||||
obj-$(CONFIG_WPCM450_AIC) += irq-wpcm450-aic.o
|
||||
obj-$(CONFIG_IRQ_IDT3243X) += irq-idt3243x.o
|
||||
obj-$(CONFIG_APPLE_AIC) += irq-apple-aic.o
|
||||
obj-$(CONFIG_MCHP_EIC) += irq-mchp-eic.o
|
||||
|
||||
280
drivers/irqchip/irq-mchp-eic.c
Normal file
280
drivers/irqchip/irq-mchp-eic.c
Normal file
@ -0,0 +1,280 @@
|
||||
// SPDX-License-Identifier: GPL-2.0-only
|
||||
/*
|
||||
* Microchip External Interrupt Controller driver
|
||||
*
|
||||
* Copyright (C) 2021 Microchip Technology Inc. and its subsidiaries
|
||||
*
|
||||
* Author: Claudiu Beznea <claudiu.beznea@microchip.com>
|
||||
*/
|
||||
#include <linux/clk.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/interrupt.h>
|
||||
#include <linux/irqchip.h>
|
||||
#include <linux/of_address.h>
|
||||
#include <linux/of_irq.h>
|
||||
#include <linux/syscore_ops.h>
|
||||
|
||||
#include <dt-bindings/interrupt-controller/arm-gic.h>
|
||||
|
||||
#define MCHP_EIC_GFCS (0x0)
|
||||
#define MCHP_EIC_SCFG(x) (0x4 + (x) * 0x4)
|
||||
#define MCHP_EIC_SCFG_EN BIT(16)
|
||||
#define MCHP_EIC_SCFG_LVL BIT(9)
|
||||
#define MCHP_EIC_SCFG_POL BIT(8)
|
||||
|
||||
#define MCHP_EIC_NIRQ (2)
|
||||
|
||||
/*
|
||||
* struct mchp_eic - EIC private data structure
|
||||
* @base: base address
|
||||
* @clk: peripheral clock
|
||||
* @domain: irq domain
|
||||
* @irqs: irqs b/w eic and gic
|
||||
* @scfg: backup for scfg registers (necessary for backup and self-refresh mode)
|
||||
* @wakeup_source: wakeup source mask
|
||||
*/
|
||||
struct mchp_eic {
|
||||
void __iomem *base;
|
||||
struct clk *clk;
|
||||
struct irq_domain *domain;
|
||||
u32 irqs[MCHP_EIC_NIRQ];
|
||||
u32 scfg[MCHP_EIC_NIRQ];
|
||||
u32 wakeup_source;
|
||||
};
|
||||
|
||||
static struct mchp_eic *eic;
|
||||
|
||||
static void mchp_eic_irq_mask(struct irq_data *d)
|
||||
{
|
||||
unsigned int tmp;
|
||||
|
||||
tmp = readl_relaxed(eic->base + MCHP_EIC_SCFG(d->hwirq));
|
||||
tmp &= ~MCHP_EIC_SCFG_EN;
|
||||
writel_relaxed(tmp, eic->base + MCHP_EIC_SCFG(d->hwirq));
|
||||
|
||||
irq_chip_mask_parent(d);
|
||||
}
|
||||
|
||||
static void mchp_eic_irq_unmask(struct irq_data *d)
|
||||
{
|
||||
unsigned int tmp;
|
||||
|
||||
tmp = readl_relaxed(eic->base + MCHP_EIC_SCFG(d->hwirq));
|
||||
tmp |= MCHP_EIC_SCFG_EN;
|
||||
writel_relaxed(tmp, eic->base + MCHP_EIC_SCFG(d->hwirq));
|
||||
|
||||
irq_chip_unmask_parent(d);
|
||||
}
|
||||
|
||||
static int mchp_eic_irq_set_type(struct irq_data *d, unsigned int type)
|
||||
{
|
||||
unsigned int parent_irq_type;
|
||||
unsigned int tmp;
|
||||
|
||||
tmp = readl_relaxed(eic->base + MCHP_EIC_SCFG(d->hwirq));
|
||||
tmp &= ~(MCHP_EIC_SCFG_POL | MCHP_EIC_SCFG_LVL);
|
||||
switch (type) {
|
||||
case IRQ_TYPE_LEVEL_HIGH:
|
||||
tmp |= MCHP_EIC_SCFG_POL | MCHP_EIC_SCFG_LVL;
|
||||
parent_irq_type = IRQ_TYPE_LEVEL_HIGH;
|
||||
break;
|
||||
case IRQ_TYPE_LEVEL_LOW:
|
||||
tmp |= MCHP_EIC_SCFG_LVL;
|
||||
parent_irq_type = IRQ_TYPE_LEVEL_HIGH;
|
||||
break;
|
||||
case IRQ_TYPE_EDGE_RISING:
|
||||
parent_irq_type = IRQ_TYPE_EDGE_RISING;
|
||||
break;
|
||||
case IRQ_TYPE_EDGE_FALLING:
|
||||
tmp |= MCHP_EIC_SCFG_POL;
|
||||
parent_irq_type = IRQ_TYPE_EDGE_RISING;
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
writel_relaxed(tmp, eic->base + MCHP_EIC_SCFG(d->hwirq));
|
||||
|
||||
return irq_chip_set_type_parent(d, parent_irq_type);
|
||||
}
|
||||
|
||||
static int mchp_eic_irq_set_wake(struct irq_data *d, unsigned int on)
|
||||
{
|
||||
irq_set_irq_wake(eic->irqs[d->hwirq], on);
|
||||
if (on)
|
||||
eic->wakeup_source |= BIT(d->hwirq);
|
||||
else
|
||||
eic->wakeup_source &= ~BIT(d->hwirq);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int mchp_eic_irq_suspend(void)
|
||||
{
|
||||
unsigned int hwirq;
|
||||
|
||||
for (hwirq = 0; hwirq < MCHP_EIC_NIRQ; hwirq++)
|
||||
eic->scfg[hwirq] = readl_relaxed(eic->base +
|
||||
MCHP_EIC_SCFG(hwirq));
|
||||
|
||||
if (!eic->wakeup_source)
|
||||
clk_disable_unprepare(eic->clk);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void mchp_eic_irq_resume(void)
|
||||
{
|
||||
unsigned int hwirq;
|
||||
|
||||
if (!eic->wakeup_source)
|
||||
clk_prepare_enable(eic->clk);
|
||||
|
||||
for (hwirq = 0; hwirq < MCHP_EIC_NIRQ; hwirq++)
|
||||
writel_relaxed(eic->scfg[hwirq], eic->base +
|
||||
MCHP_EIC_SCFG(hwirq));
|
||||
}
|
||||
|
||||
static struct syscore_ops mchp_eic_syscore_ops = {
|
||||
.suspend = mchp_eic_irq_suspend,
|
||||
.resume = mchp_eic_irq_resume,
|
||||
};
|
||||
|
||||
static struct irq_chip mchp_eic_chip = {
|
||||
.name = "eic",
|
||||
.flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_SET_TYPE_MASKED,
|
||||
.irq_mask = mchp_eic_irq_mask,
|
||||
.irq_unmask = mchp_eic_irq_unmask,
|
||||
.irq_set_type = mchp_eic_irq_set_type,
|
||||
.irq_ack = irq_chip_ack_parent,
|
||||
.irq_eoi = irq_chip_eoi_parent,
|
||||
.irq_retrigger = irq_chip_retrigger_hierarchy,
|
||||
.irq_set_wake = mchp_eic_irq_set_wake,
|
||||
};
|
||||
|
||||
static int mchp_eic_domain_alloc(struct irq_domain *domain, unsigned int virq,
|
||||
unsigned int nr_irqs, void *data)
|
||||
{
|
||||
struct irq_fwspec *fwspec = data;
|
||||
struct irq_fwspec parent_fwspec;
|
||||
irq_hw_number_t hwirq;
|
||||
unsigned int type;
|
||||
int ret;
|
||||
|
||||
if (WARN_ON(nr_irqs != 1))
|
||||
return -EINVAL;
|
||||
|
||||
ret = irq_domain_translate_twocell(domain, fwspec, &hwirq, &type);
|
||||
if (ret || hwirq >= MCHP_EIC_NIRQ)
|
||||
return ret;
|
||||
|
||||
switch (type) {
|
||||
case IRQ_TYPE_EDGE_RISING:
|
||||
case IRQ_TYPE_LEVEL_HIGH:
|
||||
break;
|
||||
case IRQ_TYPE_EDGE_FALLING:
|
||||
type = IRQ_TYPE_EDGE_RISING;
|
||||
break;
|
||||
case IRQ_TYPE_LEVEL_LOW:
|
||||
type = IRQ_TYPE_LEVEL_HIGH;
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
irq_domain_set_hwirq_and_chip(domain, virq, hwirq, &mchp_eic_chip, eic);
|
||||
|
||||
parent_fwspec.fwnode = domain->parent->fwnode;
|
||||
parent_fwspec.param_count = 3;
|
||||
parent_fwspec.param[0] = GIC_SPI;
|
||||
parent_fwspec.param[1] = eic->irqs[hwirq];
|
||||
parent_fwspec.param[2] = type;
|
||||
|
||||
return irq_domain_alloc_irqs_parent(domain, virq, 1, &parent_fwspec);
|
||||
}
|
||||
|
||||
static const struct irq_domain_ops mchp_eic_domain_ops = {
|
||||
.translate = irq_domain_translate_twocell,
|
||||
.alloc = mchp_eic_domain_alloc,
|
||||
.free = irq_domain_free_irqs_common,
|
||||
};
|
||||
|
||||
static int mchp_eic_init(struct device_node *node, struct device_node *parent)
|
||||
{
|
||||
struct irq_domain *parent_domain = NULL;
|
||||
int ret, i;
|
||||
|
||||
eic = kzalloc(sizeof(*eic), GFP_KERNEL);
|
||||
if (!eic)
|
||||
return -ENOMEM;
|
||||
|
||||
eic->base = of_iomap(node, 0);
|
||||
if (IS_ERR(eic->base)) {
|
||||
ret = -ENOMEM;
|
||||
goto free;
|
||||
}
|
||||
|
||||
parent_domain = irq_find_host(parent);
|
||||
if (!parent_domain) {
|
||||
ret = -ENODEV;
|
||||
goto unmap;
|
||||
}
|
||||
|
||||
eic->clk = of_clk_get_by_name(node, "pclk");
|
||||
if (IS_ERR(eic->clk)) {
|
||||
ret = PTR_ERR(eic->clk);
|
||||
goto unmap;
|
||||
}
|
||||
|
||||
ret = clk_prepare_enable(eic->clk);
|
||||
if (ret)
|
||||
goto unmap;
|
||||
|
||||
for (i = 0; i < MCHP_EIC_NIRQ; i++) {
|
||||
struct of_phandle_args irq;
|
||||
|
||||
/* Disable it, if any. */
|
||||
writel_relaxed(0UL, eic->base + MCHP_EIC_SCFG(i));
|
||||
|
||||
ret = of_irq_parse_one(node, i, &irq);
|
||||
if (ret)
|
||||
goto clk_unprepare;
|
||||
|
||||
if (WARN_ON(irq.args_count != 3)) {
|
||||
ret = -EINVAL;
|
||||
goto clk_unprepare;
|
||||
}
|
||||
|
||||
eic->irqs[i] = irq.args[1];
|
||||
}
|
||||
|
||||
eic->domain = irq_domain_add_hierarchy(parent_domain, 0, MCHP_EIC_NIRQ,
|
||||
node, &mchp_eic_domain_ops, eic);
|
||||
if (!eic->domain) {
|
||||
pr_err("%pOF: Failed to add domain\n", node);
|
||||
ret = -ENODEV;
|
||||
goto clk_unprepare;
|
||||
}
|
||||
|
||||
register_syscore_ops(&mchp_eic_syscore_ops);
|
||||
|
||||
pr_info("%pOF: EIC registered, nr_irqs %u\n", node, MCHP_EIC_NIRQ);
|
||||
|
||||
return 0;
|
||||
|
||||
clk_unprepare:
|
||||
clk_disable_unprepare(eic->clk);
|
||||
unmap:
|
||||
iounmap(eic->base);
|
||||
free:
|
||||
kfree(eic);
|
||||
return ret;
|
||||
}
|
||||
|
||||
IRQCHIP_PLATFORM_DRIVER_BEGIN(mchp_eic)
|
||||
IRQCHIP_MATCH("microchip,sama7g5-eic", mchp_eic_init)
|
||||
IRQCHIP_PLATFORM_DRIVER_END(mchp_eic)
|
||||
|
||||
MODULE_DESCRIPTION("Microchip External Interrupt Controller");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
MODULE_AUTHOR("Claudiu Beznea <claudiu.beznea@microchip.com>");
|
||||
Loading…
Reference in New Issue
Block a user