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Message-ID: <D143YFK7334S.3MM7YORC0H24X@microchip.com>
Date: Wed, 8 May 2024 08:08:30 +0000
From: <Steen.Hegelund@...rochip.com>
To: <herve.codina@...tlin.com>, <tglx@...utronix.de>, <robh@...nel.org>,
<krzk+dt@...nel.org>, <conor+dt@...nel.org>, <davem@...emloft.net>,
<edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
<lee@...nel.org>, <arnd@...db.de>, <Horatiu.Vultur@...rochip.com>,
<UNGLinuxDriver@...rochip.com>, <andrew@...n.ch>, <hkallweit1@...il.com>,
<linux@...linux.org.uk>, <saravanak@...gle.com>, <bhelgaas@...gle.com>,
<p.zabel@...gutronix.de>, <Lars.Povlsen@...rochip.com>,
<Steen.Hegelund@...rochip.com>, <Daniel.Machon@...rochip.com>,
<alexandre.belloni@...tlin.com>
CC: <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
<netdev@...r.kernel.org>, <linux-pci@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>, <Allan.Nielsen@...rochip.com>,
<luca.ceresoli@...tlin.com>, <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 12/17] irqchip: Add support for LAN966x OIC
Hi Herve,
On Tue Apr 30, 2024 at 10:37 AM CEST, Herve Codina wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>
> 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@...tlin.com>
> ---
> drivers/irqchip/Kconfig | 12 ++
> drivers/irqchip/Makefile | 1 +
> drivers/irqchip/irq-lan966x-oic.c | 301 ++++++++++++++++++++++++++++++
> 3 files changed, 314 insertions(+)
> create mode 100644 drivers/irqchip/irq-lan966x-oic.c
>
> diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
> index 72c07a12f5e1..973eebc8d1d1 100644
> --- a/drivers/irqchip/Kconfig
> +++ b/drivers/irqchip/Kconfig
> @@ -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
>
> diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
> index ec4a18380998..762d3078aa3b 100644
> --- a/drivers/irqchip/Makefile
> +++ b/drivers/irqchip/Makefile
> @@ -101,6 +101,7 @@ 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
> diff --git a/drivers/irqchip/irq-lan966x-oic.c b/drivers/irqchip/irq-lan966x-oic.c
> new file mode 100644
> index 000000000000..342f0dbf16e3
> --- /dev/null
> +++ b/drivers/irqchip/irq-lan966x-oic.c
> @@ -0,0 +1,301 @@
> +// 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@...rochip.com>
> + * Clément Léger <clement.leger@...tlin.com>
> + * Herve Codina <herve.codina@...tlin.com>
> + */
> +
> +#include <linux/bitops.h>
> +#include <linux/build_bug.h>
> +#include <linux/interrupt.h>
> +#include <linux/irqchip/chained_irq.h>
> +#include <linux/irqchip.h>
> +#include <linux/irq.h>
> +#include <linux/iopoll.h>
> +#include <linux/mfd/core.h>
> +#include <linux/module.h>
> +#include <linux/pci.h>
> +#include <linux/delay.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 {
> + struct irq_domain *domain;
> + 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) */
Are the indices really needed on LAN966X_OIC_DST_INTR_MAP* and _IDENT*
You do not appear to be using them?
> +#define LAN966X_OIC_DST_INTR_MAP(_n) 0x78
> +#define LAN966X_OIC_DST_INTR_MAP1(_n) 0x9c
> +#define LAN966X_OIC_DST_INTR_MAP2(_n) 0xc0
> +
> +/* Currently active interrupt sources per destination (_n = 0..8) */
> +#define LAN966X_OIC_DST_INTR_IDENT(_n) 0xe4
> +#define LAN966X_OIC_DST_INTR_IDENT1(_n) 0x108
> +#define LAN966X_OIC_DST_INTR_IDENT2(_n) 0x12c
> +
> +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 void lan966x_oic_chip_init(struct lan966x_oic_data *lan966x_oic,
> + struct irq_chip_generic *gc,
> + struct lan966x_oic_chip_regs *chip_regs)
> +{
> + 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, ~0, chip_regs->reg_off_ena_clr);
> +}
> +
> +static void lan966x_oic_chip_exit(struct irq_chip_generic *gc)
> +{
> + /* Disable and ack all interrupts handled by this chip */
> + irq_reg_writel(gc, ~0, gc->chip_types[0].regs.disable);
> + irq_reg_writel(gc, ~0, gc->chip_types[0].regs.ack);
> +}
> +
> +static int lan966x_oic_probe(struct platform_device *pdev)
> +{
> + struct device_node *node = pdev->dev.of_node;
> + struct lan966x_oic_data *lan966x_oic;
> + struct device *dev = &pdev->dev;
> + struct irq_chip_generic *gc;
> + int ret;
> + int i;
> +
> + 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->domain = irq_domain_alloc_linear(of_node_to_fwnode(node),
> + LAN966X_OIC_NR_IRQ,
> + &irq_generic_chip_ops, NULL);
> + if (!lan966x_oic->domain) {
> + dev_err(dev, "failed to create an IRQ domain\n");
> + return -EINVAL;
> + }
> +
> + lan966x_oic->irq = platform_get_irq(pdev, 0);
> + if (lan966x_oic->irq < 0) {
> + dev_err_probe(dev, lan966x_oic->irq, "failed to get the IRQ\n");
> + goto err_domain_free;
> + }
> +
> + ret = irq_alloc_domain_generic_chips(lan966x_oic->domain, 32, 1, "lan966x-oic",
> + handle_level_irq, 0, 0, 0);
> + if (ret) {
> + dev_err_probe(dev, ret, "failed to alloc irq domain gc\n");
> + goto err_domain_free;
> + }
> +
> + /* Init chips */
> + BUILD_BUG_ON(DIV_ROUND_UP(LAN966X_OIC_NR_IRQ, 32) != ARRAY_SIZE(lan966x_oic_chip_regs));
> + for (i = 0; i < ARRAY_SIZE(lan966x_oic_chip_regs); i++) {
> + gc = irq_get_domain_generic_chip(lan966x_oic->domain, i * 32);
> + lan966x_oic_chip_init(lan966x_oic, gc, &lan966x_oic_chip_regs[i]);
> + }
> +
> + irq_set_chained_handler_and_data(lan966x_oic->irq, lan966x_oic_irq_handler,
> + lan966x_oic->domain);
> +
> + irq_domain_publish(lan966x_oic->domain);
> + platform_set_drvdata(pdev, lan966x_oic);
> + return 0;
> +
> +err_domain_free:
> + irq_domain_free(lan966x_oic->domain);
> + return ret;
> +}
> +
> +static void lan966x_oic_remove(struct platform_device *pdev)
> +{
> + struct lan966x_oic_data *lan966x_oic = platform_get_drvdata(pdev);
> + struct irq_chip_generic *gc;
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(lan966x_oic_chip_regs); i++) {
> + gc = irq_get_domain_generic_chip(lan966x_oic->domain, i * 32);
> + lan966x_oic_chip_exit(gc);
> + }
> +
> + irq_set_chained_handler_and_data(lan966x_oic->irq, NULL, NULL);
> +
> + for (i = 0; i < LAN966X_OIC_NR_IRQ; i++)
> + irq_dispose_mapping(irq_find_mapping(lan966x_oic->domain, i));
> +
> + irq_domain_unpublish(lan966x_oic->domain);
> +
> + for (i = 0; i < ARRAY_SIZE(lan966x_oic_chip_regs); i++) {
> + gc = irq_get_domain_generic_chip(lan966x_oic->domain, i * 32);
> + irq_remove_generic_chip(gc, ~0, 0, 0);
> + }
> +
> + kfree(lan966x_oic->domain->gc);
> + irq_domain_free(lan966x_oic->domain);
> +}
> +
> +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,
> + .remove_new = lan966x_oic_remove,
> + .driver = {
> + .name = "lan966x-oic",
> + .of_match_table = lan966x_oic_of_match,
> + },
> +};
> +module_platform_driver(lan966x_oic_driver);
> +
> +MODULE_AUTHOR("Herve Codina <herve.codina@...tlin.com>");
> +MODULE_DESCRIPTION("Microchip LAN966x OIC driver");
> +MODULE_LICENSE("GPL");
> --
> 2.44.0
Best regards
Steen
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