![Lokesh Vutla](/assets/img/avatar_default.png)
Texas Instruments' K3 generation SoCs has an IP Interrupt Router that does allows for redirection of input interrupts to host interrupt controller. Interrupt Router inputs are either from a peripheral or from an Interrupt Aggregator which is another interrupt controller. Configuration of the interrupt router registers can only be done by a system co-processor and the driver needs to send a message to this co processor over TISCI protocol. Add support for Interrupt Router driver over TISCI protocol. Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
276 lines
7.7 KiB
C
276 lines
7.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Texas Instruments' K3 Interrupt Router irqchip driver
|
|
*
|
|
* Copyright (C) 2018-2019 Texas Instruments Incorporated - http://www.ti.com/
|
|
* Lokesh Vutla <lokeshvutla@ti.com>
|
|
*/
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/io.h>
|
|
#include <linux/irqchip.h>
|
|
#include <linux/irqdomain.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_irq.h>
|
|
#include <linux/soc/ti/ti_sci_protocol.h>
|
|
|
|
#define TI_SCI_DEV_ID_MASK 0xffff
|
|
#define TI_SCI_DEV_ID_SHIFT 16
|
|
#define TI_SCI_IRQ_ID_MASK 0xffff
|
|
#define TI_SCI_IRQ_ID_SHIFT 0
|
|
#define HWIRQ_TO_DEVID(hwirq) (((hwirq) >> (TI_SCI_DEV_ID_SHIFT)) & \
|
|
(TI_SCI_DEV_ID_MASK))
|
|
#define HWIRQ_TO_IRQID(hwirq) ((hwirq) & (TI_SCI_IRQ_ID_MASK))
|
|
#define TO_HWIRQ(dev, index) ((((dev) & TI_SCI_DEV_ID_MASK) << \
|
|
TI_SCI_DEV_ID_SHIFT) | \
|
|
((index) & TI_SCI_IRQ_ID_MASK))
|
|
|
|
/**
|
|
* struct ti_sci_intr_irq_domain - Structure representing a TISCI based
|
|
* Interrupt Router IRQ domain.
|
|
* @sci: Pointer to TISCI handle
|
|
* @dst_irq: TISCI resource pointer representing GIC irq controller.
|
|
* @dst_id: TISCI device ID of the GIC irq controller.
|
|
* @type: Specifies the trigger type supported by this Interrupt Router
|
|
*/
|
|
struct ti_sci_intr_irq_domain {
|
|
const struct ti_sci_handle *sci;
|
|
struct ti_sci_resource *dst_irq;
|
|
u32 dst_id;
|
|
u32 type;
|
|
};
|
|
|
|
static struct irq_chip ti_sci_intr_irq_chip = {
|
|
.name = "INTR",
|
|
.irq_eoi = irq_chip_eoi_parent,
|
|
.irq_mask = irq_chip_mask_parent,
|
|
.irq_unmask = irq_chip_unmask_parent,
|
|
.irq_set_type = irq_chip_set_type_parent,
|
|
.irq_retrigger = irq_chip_retrigger_hierarchy,
|
|
.irq_set_affinity = irq_chip_set_affinity_parent,
|
|
};
|
|
|
|
/**
|
|
* ti_sci_intr_irq_domain_translate() - Retrieve hwirq and type from
|
|
* IRQ firmware specific handler.
|
|
* @domain: Pointer to IRQ domain
|
|
* @fwspec: Pointer to IRQ specific firmware structure
|
|
* @hwirq: IRQ number identified by hardware
|
|
* @type: IRQ type
|
|
*
|
|
* Return 0 if all went ok else appropriate error.
|
|
*/
|
|
static int ti_sci_intr_irq_domain_translate(struct irq_domain *domain,
|
|
struct irq_fwspec *fwspec,
|
|
unsigned long *hwirq,
|
|
unsigned int *type)
|
|
{
|
|
struct ti_sci_intr_irq_domain *intr = domain->host_data;
|
|
|
|
if (fwspec->param_count != 2)
|
|
return -EINVAL;
|
|
|
|
*hwirq = TO_HWIRQ(fwspec->param[0], fwspec->param[1]);
|
|
*type = intr->type;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ti_sci_intr_irq_domain_free() - Free the specified IRQs from the domain.
|
|
* @domain: Domain to which the irqs belong
|
|
* @virq: Linux virtual IRQ to be freed.
|
|
* @nr_irqs: Number of continuous irqs to be freed
|
|
*/
|
|
static void ti_sci_intr_irq_domain_free(struct irq_domain *domain,
|
|
unsigned int virq, unsigned int nr_irqs)
|
|
{
|
|
struct ti_sci_intr_irq_domain *intr = domain->host_data;
|
|
struct irq_data *data, *parent_data;
|
|
u16 dev_id, irq_index;
|
|
|
|
parent_data = irq_domain_get_irq_data(domain->parent, virq);
|
|
data = irq_domain_get_irq_data(domain, virq);
|
|
irq_index = HWIRQ_TO_IRQID(data->hwirq);
|
|
dev_id = HWIRQ_TO_DEVID(data->hwirq);
|
|
|
|
intr->sci->ops.rm_irq_ops.free_irq(intr->sci, dev_id, irq_index,
|
|
intr->dst_id, parent_data->hwirq);
|
|
ti_sci_release_resource(intr->dst_irq, parent_data->hwirq);
|
|
irq_domain_free_irqs_parent(domain, virq, 1);
|
|
irq_domain_reset_irq_data(data);
|
|
}
|
|
|
|
/**
|
|
* ti_sci_intr_alloc_gic_irq() - Allocate GIC specific IRQ
|
|
* @domain: Pointer to the interrupt router IRQ domain
|
|
* @virq: Corresponding Linux virtual IRQ number
|
|
* @hwirq: Corresponding hwirq for the IRQ within this IRQ domain
|
|
*
|
|
* Returns 0 if all went well else appropriate error pointer.
|
|
*/
|
|
static int ti_sci_intr_alloc_gic_irq(struct irq_domain *domain,
|
|
unsigned int virq, u32 hwirq)
|
|
{
|
|
struct ti_sci_intr_irq_domain *intr = domain->host_data;
|
|
struct irq_fwspec fwspec;
|
|
u16 dev_id, irq_index;
|
|
u16 dst_irq;
|
|
int err;
|
|
|
|
dev_id = HWIRQ_TO_DEVID(hwirq);
|
|
irq_index = HWIRQ_TO_IRQID(hwirq);
|
|
|
|
dst_irq = ti_sci_get_free_resource(intr->dst_irq);
|
|
if (dst_irq == TI_SCI_RESOURCE_NULL)
|
|
return -EINVAL;
|
|
|
|
fwspec.fwnode = domain->parent->fwnode;
|
|
fwspec.param_count = 3;
|
|
fwspec.param[0] = 0; /* SPI */
|
|
fwspec.param[1] = dst_irq - 32; /* SPI offset */
|
|
fwspec.param[2] = intr->type;
|
|
|
|
err = irq_domain_alloc_irqs_parent(domain, virq, 1, &fwspec);
|
|
if (err)
|
|
goto err_irqs;
|
|
|
|
err = intr->sci->ops.rm_irq_ops.set_irq(intr->sci, dev_id, irq_index,
|
|
intr->dst_id, dst_irq);
|
|
if (err)
|
|
goto err_msg;
|
|
|
|
return 0;
|
|
|
|
err_msg:
|
|
irq_domain_free_irqs_parent(domain, virq, 1);
|
|
err_irqs:
|
|
ti_sci_release_resource(intr->dst_irq, dst_irq);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* ti_sci_intr_irq_domain_alloc() - Allocate Interrupt router IRQs
|
|
* @domain: Point to the interrupt router IRQ domain
|
|
* @virq: Corresponding Linux virtual IRQ number
|
|
* @nr_irqs: Continuous irqs to be allocated
|
|
* @data: Pointer to firmware specifier
|
|
*
|
|
* Return 0 if all went well else appropriate error value.
|
|
*/
|
|
static int ti_sci_intr_irq_domain_alloc(struct irq_domain *domain,
|
|
unsigned int virq, unsigned int nr_irqs,
|
|
void *data)
|
|
{
|
|
struct irq_fwspec *fwspec = data;
|
|
unsigned long hwirq;
|
|
unsigned int flags;
|
|
int err;
|
|
|
|
err = ti_sci_intr_irq_domain_translate(domain, fwspec, &hwirq, &flags);
|
|
if (err)
|
|
return err;
|
|
|
|
err = ti_sci_intr_alloc_gic_irq(domain, virq, hwirq);
|
|
if (err)
|
|
return err;
|
|
|
|
irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
|
|
&ti_sci_intr_irq_chip, NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct irq_domain_ops ti_sci_intr_irq_domain_ops = {
|
|
.free = ti_sci_intr_irq_domain_free,
|
|
.alloc = ti_sci_intr_irq_domain_alloc,
|
|
.translate = ti_sci_intr_irq_domain_translate,
|
|
};
|
|
|
|
static int ti_sci_intr_irq_domain_probe(struct platform_device *pdev)
|
|
{
|
|
struct irq_domain *parent_domain, *domain;
|
|
struct ti_sci_intr_irq_domain *intr;
|
|
struct device_node *parent_node;
|
|
struct device *dev = &pdev->dev;
|
|
int ret;
|
|
|
|
parent_node = of_irq_find_parent(dev_of_node(dev));
|
|
if (!parent_node) {
|
|
dev_err(dev, "Failed to get IRQ parent node\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
parent_domain = irq_find_host(parent_node);
|
|
if (!parent_domain) {
|
|
dev_err(dev, "Failed to find IRQ parent domain\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
intr = devm_kzalloc(dev, sizeof(*intr), GFP_KERNEL);
|
|
if (!intr)
|
|
return -ENOMEM;
|
|
|
|
ret = of_property_read_u32(dev_of_node(dev), "ti,intr-trigger-type",
|
|
&intr->type);
|
|
if (ret) {
|
|
dev_err(dev, "missing ti,intr-trigger-type property\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
intr->sci = devm_ti_sci_get_by_phandle(dev, "ti,sci");
|
|
if (IS_ERR(intr->sci)) {
|
|
ret = PTR_ERR(intr->sci);
|
|
if (ret != -EPROBE_DEFER)
|
|
dev_err(dev, "ti,sci read fail %d\n", ret);
|
|
intr->sci = NULL;
|
|
return ret;
|
|
}
|
|
|
|
ret = of_property_read_u32(dev_of_node(dev), "ti,sci-dst-id",
|
|
&intr->dst_id);
|
|
if (ret) {
|
|
dev_err(dev, "missing 'ti,sci-dst-id' property\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
intr->dst_irq = devm_ti_sci_get_of_resource(intr->sci, dev,
|
|
intr->dst_id,
|
|
"ti,sci-rm-range-girq");
|
|
if (IS_ERR(intr->dst_irq)) {
|
|
dev_err(dev, "Destination irq resource allocation failed\n");
|
|
return PTR_ERR(intr->dst_irq);
|
|
}
|
|
|
|
domain = irq_domain_add_hierarchy(parent_domain, 0, 0, dev_of_node(dev),
|
|
&ti_sci_intr_irq_domain_ops, intr);
|
|
if (!domain) {
|
|
dev_err(dev, "Failed to allocate IRQ domain\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id ti_sci_intr_irq_domain_of_match[] = {
|
|
{ .compatible = "ti,sci-intr", },
|
|
{ /* sentinel */ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, ti_sci_intr_irq_domain_of_match);
|
|
|
|
static struct platform_driver ti_sci_intr_irq_domain_driver = {
|
|
.probe = ti_sci_intr_irq_domain_probe,
|
|
.driver = {
|
|
.name = "ti-sci-intr",
|
|
.of_match_table = ti_sci_intr_irq_domain_of_match,
|
|
},
|
|
};
|
|
module_platform_driver(ti_sci_intr_irq_domain_driver);
|
|
|
|
MODULE_AUTHOR("Lokesh Vutla <lokeshvutla@ticom>");
|
|
MODULE_DESCRIPTION("K3 Interrupt Router driver over TI SCI protocol");
|
|
MODULE_LICENSE("GPL v2");
|