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irqchip: Add support for LAN966x OIC

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The Microchip LAN966x outband interrupt controller (OIC) maps the
internal interrupt sources of the LAN966x device to an external
interrupt.
When the LAN966x device is used as a PCI device, the external interrupt
is routed to the PCI interrupt.

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240614173232.1184015-23-herve.codina@bootlin.com
This commit is contained in:
Herve Codina 2024-06-14 19:32:23 +02:00 committed by Thomas Gleixner
parent 17972a5f1b
commit 3e3a7b3533
3 changed files with 291 additions and 0 deletions
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12
drivers/irqchip/Kconfig
View File

@ -169,6 +169,18 @@ config IXP4XX_IRQ
select IRQ_DOMAIN
select SPARSE_IRQ
config LAN966X_OIC
tristate "Microchip LAN966x OIC Support"
select GENERIC_IRQ_CHIP
select IRQ_DOMAIN
help
Enable support for the LAN966x Outbound Interrupt Controller.
This controller is present on the Microchip LAN966x PCI device and
maps the internal interrupts sources to PCIe interrupt.
To compile this driver as a module, choose M here: the module
will be called irq-lan966x-oic.
config MADERA_IRQ
tristate

1
drivers/irqchip/Makefile
View File

@ -104,6 +104,7 @@ obj-$(CONFIG_IMX_IRQSTEER) += irq-imx-irqsteer.o
obj-$(CONFIG_IMX_INTMUX) += irq-imx-intmux.o
obj-$(CONFIG_IMX_MU_MSI) += irq-imx-mu-msi.o
obj-$(CONFIG_MADERA_IRQ) += irq-madera.o
obj-$(CONFIG_LAN966X_OIC) += irq-lan966x-oic.o
obj-$(CONFIG_LS1X_IRQ) += irq-ls1x.o
obj-$(CONFIG_TI_SCI_INTR_IRQCHIP) += irq-ti-sci-intr.o
obj-$(CONFIG_TI_SCI_INTA_IRQCHIP) += irq-ti-sci-inta.o

278
drivers/irqchip/irq-lan966x-oic.c Normal file
View File

@ -0,0 +1,278 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Driver for the Microchip LAN966x outbound interrupt controller
*
* Copyright (c) 2024 Technology Inc. and its subsidiaries.
*
* Authors:
* Horatiu Vultur <horatiu.vultur@microchip.com>
* Clément Léger <clement.leger@bootlin.com>
* Herve Codina <herve.codina@bootlin.com>
*/
#include <linux/interrupt.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/irqchip.h>
#include <linux/irq.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
struct lan966x_oic_chip_regs {
int reg_off_ena_set;
int reg_off_ena_clr;
int reg_off_sticky;
int reg_off_ident;
int reg_off_map;
};
struct lan966x_oic_data {
void __iomem *regs;
int irq;
};
#define LAN966X_OIC_NR_IRQ 86
/* Interrupt sticky status */
#define LAN966X_OIC_INTR_STICKY 0x30
#define LAN966X_OIC_INTR_STICKY1 0x34
#define LAN966X_OIC_INTR_STICKY2 0x38
/* Interrupt enable */
#define LAN966X_OIC_INTR_ENA 0x48
#define LAN966X_OIC_INTR_ENA1 0x4c
#define LAN966X_OIC_INTR_ENA2 0x50
/* Atomic clear of interrupt enable */
#define LAN966X_OIC_INTR_ENA_CLR 0x54
#define LAN966X_OIC_INTR_ENA_CLR1 0x58
#define LAN966X_OIC_INTR_ENA_CLR2 0x5c
/* Atomic set of interrupt */
#define LAN966X_OIC_INTR_ENA_SET 0x60
#define LAN966X_OIC_INTR_ENA_SET1 0x64
#define LAN966X_OIC_INTR_ENA_SET2 0x68
/* Mapping of source to destination interrupts (_n = 0..8) */
#define LAN966X_OIC_DST_INTR_MAP(_n) (0x78 + (_n) * 4)
#define LAN966X_OIC_DST_INTR_MAP1(_n) (0x9c + (_n) * 4)
#define LAN966X_OIC_DST_INTR_MAP2(_n) (0xc0 + (_n) * 4)
/* Currently active interrupt sources per destination (_n = 0..8) */
#define LAN966X_OIC_DST_INTR_IDENT(_n) (0xe4 + (_n) * 4)
#define LAN966X_OIC_DST_INTR_IDENT1(_n) (0x108 + (_n) * 4)
#define LAN966X_OIC_DST_INTR_IDENT2(_n) (0x12c + (_n) * 4)
static unsigned int lan966x_oic_irq_startup(struct irq_data *data)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data);
struct irq_chip_type *ct = irq_data_get_chip_type(data);
struct lan966x_oic_chip_regs *chip_regs = gc->private;
u32 map;
irq_gc_lock(gc);
/* Map the source interrupt to the destination */
map = irq_reg_readl(gc, chip_regs->reg_off_map);
map |= data->mask;
irq_reg_writel(gc, map, chip_regs->reg_off_map);
irq_gc_unlock(gc);
ct->chip.irq_ack(data);
ct->chip.irq_unmask(data);
return 0;
}
static void lan966x_oic_irq_shutdown(struct irq_data *data)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data);
struct irq_chip_type *ct = irq_data_get_chip_type(data);
struct lan966x_oic_chip_regs *chip_regs = gc->private;
u32 map;
ct->chip.irq_mask(data);
irq_gc_lock(gc);
/* Unmap the interrupt */
map = irq_reg_readl(gc, chip_regs->reg_off_map);
map &= ~data->mask;
irq_reg_writel(gc, map, chip_regs->reg_off_map);
irq_gc_unlock(gc);
}
static int lan966x_oic_irq_set_type(struct irq_data *data,
unsigned int flow_type)
{
if (flow_type != IRQ_TYPE_LEVEL_HIGH) {
pr_err("lan966x oic doesn't support flow type %d\n", flow_type);
return -EINVAL;
}
return 0;
}
static void lan966x_oic_irq_handler_domain(struct irq_domain *d, u32 first_irq)
{
struct irq_chip_generic *gc = irq_get_domain_generic_chip(d, first_irq);
struct lan966x_oic_chip_regs *chip_regs = gc->private;
unsigned long ident;
unsigned int hwirq;
ident = irq_reg_readl(gc, chip_regs->reg_off_ident);
if (!ident)
return;
for_each_set_bit(hwirq, &ident, 32)
generic_handle_domain_irq(d, hwirq + first_irq);
}
static void lan966x_oic_irq_handler(struct irq_desc *desc)
{
struct irq_domain *d = irq_desc_get_handler_data(desc);
struct irq_chip *chip = irq_desc_get_chip(desc);
chained_irq_enter(chip, desc);
lan966x_oic_irq_handler_domain(d, 0);
lan966x_oic_irq_handler_domain(d, 32);
lan966x_oic_irq_handler_domain(d, 64);
chained_irq_exit(chip, desc);
}
static struct lan966x_oic_chip_regs lan966x_oic_chip_regs[3] = {
{
.reg_off_ena_set = LAN966X_OIC_INTR_ENA_SET,
.reg_off_ena_clr = LAN966X_OIC_INTR_ENA_CLR,
.reg_off_sticky = LAN966X_OIC_INTR_STICKY,
.reg_off_ident = LAN966X_OIC_DST_INTR_IDENT(0),
.reg_off_map = LAN966X_OIC_DST_INTR_MAP(0),
}, {
.reg_off_ena_set = LAN966X_OIC_INTR_ENA_SET1,
.reg_off_ena_clr = LAN966X_OIC_INTR_ENA_CLR1,
.reg_off_sticky = LAN966X_OIC_INTR_STICKY1,
.reg_off_ident = LAN966X_OIC_DST_INTR_IDENT1(0),
.reg_off_map = LAN966X_OIC_DST_INTR_MAP1(0),
}, {
.reg_off_ena_set = LAN966X_OIC_INTR_ENA_SET2,
.reg_off_ena_clr = LAN966X_OIC_INTR_ENA_CLR2,
.reg_off_sticky = LAN966X_OIC_INTR_STICKY2,
.reg_off_ident = LAN966X_OIC_DST_INTR_IDENT2(0),
.reg_off_map = LAN966X_OIC_DST_INTR_MAP2(0),
}
};
static int lan966x_oic_chip_init(struct irq_chip_generic *gc)
{
struct lan966x_oic_data *lan966x_oic = gc->domain->host_data;
struct lan966x_oic_chip_regs *chip_regs;
chip_regs = &lan966x_oic_chip_regs[gc->irq_base / 32];
gc->reg_base = lan966x_oic->regs;
gc->chip_types[0].regs.enable = chip_regs->reg_off_ena_set;
gc->chip_types[0].regs.disable = chip_regs->reg_off_ena_clr;
gc->chip_types[0].regs.ack = chip_regs->reg_off_sticky;
gc->chip_types[0].chip.irq_startup = lan966x_oic_irq_startup;
gc->chip_types[0].chip.irq_shutdown = lan966x_oic_irq_shutdown;
gc->chip_types[0].chip.irq_set_type = lan966x_oic_irq_set_type;
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_ack = irq_gc_ack_set_bit;
gc->private = chip_regs;
/* Disable all interrupts handled by this chip */
irq_reg_writel(gc, ~0U, chip_regs->reg_off_ena_clr);
return 0;
}
static void lan966x_oic_chip_exit(struct irq_chip_generic *gc)
{
/* Disable and ack all interrupts handled by this chip */
irq_reg_writel(gc, ~0U, gc->chip_types[0].regs.disable);
irq_reg_writel(gc, ~0U, gc->chip_types[0].regs.ack);
}
static int lan966x_oic_domain_init(struct irq_domain *d)
{
struct lan966x_oic_data *lan966x_oic = d->host_data;
irq_set_chained_handler_and_data(lan966x_oic->irq, lan966x_oic_irq_handler, d);
return 0;
}
static void lan966x_oic_domain_exit(struct irq_domain *d)
{
struct lan966x_oic_data *lan966x_oic = d->host_data;
irq_set_chained_handler_and_data(lan966x_oic->irq, NULL, NULL);
}
static int lan966x_oic_probe(struct platform_device *pdev)
{
struct irq_domain_chip_generic_info dgc_info = {
.name = "lan966x-oic",
.handler = handle_level_irq,
.irqs_per_chip = 32,
.num_ct = 1,
.init = lan966x_oic_chip_init,
.exit = lan966x_oic_chip_exit,
};
struct irq_domain_info d_info = {
.fwnode = of_node_to_fwnode(pdev->dev.of_node),
.domain_flags = IRQ_DOMAIN_FLAG_DESTROY_GC,
.size = LAN966X_OIC_NR_IRQ,
.hwirq_max = LAN966X_OIC_NR_IRQ,
.ops = &irq_generic_chip_ops,
.dgc_info = &dgc_info,
.init = lan966x_oic_domain_init,
.exit = lan966x_oic_domain_exit,
};
struct lan966x_oic_data *lan966x_oic;
struct device *dev = &pdev->dev;
struct irq_domain *domain;
lan966x_oic = devm_kmalloc(dev, sizeof(*lan966x_oic), GFP_KERNEL);
if (!lan966x_oic)
return -ENOMEM;
lan966x_oic->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(lan966x_oic->regs))
return dev_err_probe(dev, PTR_ERR(lan966x_oic->regs),
"failed to map resource\n");
lan966x_oic->irq = platform_get_irq(pdev, 0);
if (lan966x_oic->irq < 0)
return dev_err_probe(dev, lan966x_oic->irq, "failed to get the IRQ\n");
d_info.host_data = lan966x_oic;
domain = devm_irq_domain_instantiate(dev, &d_info);
if (IS_ERR(domain))
return dev_err_probe(dev, PTR_ERR(domain),
"failed to instantiate the IRQ domain\n");
return 0;
}
static const struct of_device_id lan966x_oic_of_match[] = {
{ .compatible = "microchip,lan966x-oic" },
{} /* sentinel */
};
MODULE_DEVICE_TABLE(of, lan966x_oic_of_match);
static struct platform_driver lan966x_oic_driver = {
.probe = lan966x_oic_probe,
.driver = {
.name = "lan966x-oic",
.of_match_table = lan966x_oic_of_match,
},
};
module_platform_driver(lan966x_oic_driver);
MODULE_AUTHOR("Herve Codina <herve.codina@bootlin.com>");
MODULE_DESCRIPTION("Microchip LAN966x OIC driver");
MODULE_LICENSE("GPL");