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linux/drivers/irqchip/irq-mbigen.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2015 Hisilicon Limited, All Rights Reserved.
* Author: Jun Ma <majun258@huawei.com>
* Author: Yun Wu <wuyun.wu@huawei.com>
*/
#include <linux/acpi.h>
#include <linux/interrupt.h>
#include <linux/irqchip.h>
#include <linux/module.h>
#include <linux/msi.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
/* Interrupt numbers per mbigen node supported */
#define IRQS_PER_MBIGEN_NODE 128
/* 64 irqs (Pin0-pin63) are reserved for each mbigen chip */
#define RESERVED_IRQ_PER_MBIGEN_CHIP 64
/* The maximum IRQ pin number of mbigen chip(start from 0) */
#define MAXIMUM_IRQ_PIN_NUM 1407
/**
* In mbigen vector register
* bit[21:12]: event id value
* bit[11:0]: device id
*/
#define IRQ_EVENT_ID_SHIFT 12
#define IRQ_EVENT_ID_MASK 0x3ff
/* register range of each mbigen node */
#define MBIGEN_NODE_OFFSET 0x1000
/* offset of vector register in mbigen node */
#define REG_MBIGEN_VEC_OFFSET 0x200
/**
* offset of clear register in mbigen node
* This register is used to clear the status
* of interrupt
*/
#define REG_MBIGEN_CLEAR_OFFSET 0xa000
/**
* offset of interrupt type register
* This register is used to configure interrupt
* trigger type
*/
#define REG_MBIGEN_TYPE_OFFSET 0x0
/**
* struct mbigen_device - holds the information of mbigen device.
*
* @pdev: pointer to the platform device structure of mbigen chip.
* @base: mapped address of this mbigen chip.
*/
struct mbigen_device {
struct platform_device *pdev;
void __iomem *base;
};
static inline unsigned int get_mbigen_vec_reg(irq_hw_number_t hwirq)
{
unsigned int nid, pin;
hwirq -= RESERVED_IRQ_PER_MBIGEN_CHIP;
nid = hwirq / IRQS_PER_MBIGEN_NODE + 1;
pin = hwirq % IRQS_PER_MBIGEN_NODE;
return pin * 4 + nid * MBIGEN_NODE_OFFSET
+ REG_MBIGEN_VEC_OFFSET;
}
static inline void get_mbigen_type_reg(irq_hw_number_t hwirq,
u32 *mask, u32 *addr)
{
unsigned int nid, irq_ofst, ofst;
hwirq -= RESERVED_IRQ_PER_MBIGEN_CHIP;
nid = hwirq / IRQS_PER_MBIGEN_NODE + 1;
irq_ofst = hwirq % IRQS_PER_MBIGEN_NODE;
*mask = 1 << (irq_ofst % 32);
ofst = irq_ofst / 32 * 4;
*addr = ofst + nid * MBIGEN_NODE_OFFSET
+ REG_MBIGEN_TYPE_OFFSET;
}
static inline void get_mbigen_clear_reg(irq_hw_number_t hwirq,
u32 *mask, u32 *addr)
{
unsigned int ofst = (hwirq / 32) * 4;
*mask = 1 << (hwirq % 32);
*addr = ofst + REG_MBIGEN_CLEAR_OFFSET;
}
static void mbigen_eoi_irq(struct irq_data *data)
{
void __iomem *base = data->chip_data;
u32 mask, addr;
get_mbigen_clear_reg(data->hwirq, &mask, &addr);
writel_relaxed(mask, base + addr);
irq_chip_eoi_parent(data);
}
static int mbigen_set_type(struct irq_data *data, unsigned int type)
{
void __iomem *base = data->chip_data;
u32 mask, addr, val;
if (type != IRQ_TYPE_LEVEL_HIGH && type != IRQ_TYPE_EDGE_RISING)
return -EINVAL;
get_mbigen_type_reg(data->hwirq, &mask, &addr);
val = readl_relaxed(base + addr);
if (type == IRQ_TYPE_LEVEL_HIGH)
val |= mask;
else
val &= ~mask;
writel_relaxed(val, base + addr);
return 0;
}
static struct irq_chip mbigen_irq_chip = {
.name = "mbigen-v2",
.irq_mask = irq_chip_mask_parent,
.irq_unmask = irq_chip_unmask_parent,
.irq_eoi = mbigen_eoi_irq,
.irq_set_type = mbigen_set_type,
.irq_set_affinity = irq_chip_set_affinity_parent,
};
static void mbigen_write_msg(struct msi_desc *desc, struct msi_msg *msg)
{
struct irq_data *d = irq_get_irq_data(desc->irq);
void __iomem *base = d->chip_data;
u32 val;
if (!msg->address_lo && !msg->address_hi)
return;
base += get_mbigen_vec_reg(d->hwirq);
val = readl_relaxed(base);
val &= ~(IRQ_EVENT_ID_MASK << IRQ_EVENT_ID_SHIFT);
val |= (msg->data << IRQ_EVENT_ID_SHIFT);
/* The address of doorbell is encoded in mbigen register by default
* So,we don't need to program the doorbell address at here
*/
writel_relaxed(val, base);
}
static int mbigen_domain_translate(struct irq_domain *d,
struct irq_fwspec *fwspec,
unsigned long *hwirq,
unsigned int *type)
{
if (is_of_node(fwspec->fwnode) || is_acpi_device_node(fwspec->fwnode)) {
if (fwspec->param_count != 2)
return -EINVAL;
if ((fwspec->param[0] > MAXIMUM_IRQ_PIN_NUM) ||
(fwspec->param[0] < RESERVED_IRQ_PER_MBIGEN_CHIP))
return -EINVAL;
else
*hwirq = fwspec->param[0];
/* If there is no valid irq type, just use the default type */
if ((fwspec->param[1] == IRQ_TYPE_EDGE_RISING) ||
(fwspec->param[1] == IRQ_TYPE_LEVEL_HIGH))
*type = fwspec->param[1];
else
return -EINVAL;
return 0;
}
return -EINVAL;
}
static int mbigen_irq_domain_alloc(struct irq_domain *domain,
unsigned int virq,
unsigned int nr_irqs,
void *args)
{
struct irq_fwspec *fwspec = args;
irq_hw_number_t hwirq;
unsigned int type;
struct mbigen_device *mgn_chip;
int i, err;
err = mbigen_domain_translate(domain, fwspec, &hwirq, &type);
if (err)
return err;
err = platform_msi_domain_alloc(domain, virq, nr_irqs);
if (err)
return err;
mgn_chip = platform_msi_get_host_data(domain);
for (i = 0; i < nr_irqs; i++)
irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
&mbigen_irq_chip, mgn_chip->base);
return 0;
}
static const struct irq_domain_ops mbigen_domain_ops = {
.translate = mbigen_domain_translate,
.alloc = mbigen_irq_domain_alloc,
.free = irq_domain_free_irqs_common,
};
static int mbigen_of_create_domain(struct platform_device *pdev,
struct mbigen_device *mgn_chip)
{
struct device *parent;
struct platform_device *child;
struct irq_domain *domain;
struct device_node *np;
u32 num_pins;
for_each_child_of_node(pdev->dev.of_node, np) {
if (!of_property_read_bool(np, "interrupt-controller"))
continue;
parent = platform_bus_type.dev_root;
child = of_platform_device_create(np, NULL, parent);
if (!child)
return -ENOMEM;
if (of_property_read_u32(child->dev.of_node, "num-pins",
&num_pins) < 0) {
dev_err(&pdev->dev, "No num-pins property\n");
return -EINVAL;
}
domain = platform_msi_create_device_domain(&child->dev, num_pins,
mbigen_write_msg,
&mbigen_domain_ops,
mgn_chip);
if (!domain)
return -ENOMEM;
}
return 0;
}
#ifdef CONFIG_ACPI
static int mbigen_acpi_create_domain(struct platform_device *pdev,
struct mbigen_device *mgn_chip)
{
struct irq_domain *domain;
u32 num_pins = 0;
int ret;
/*
* "num-pins" is the total number of interrupt pins implemented in
* this mbigen instance, and mbigen is an interrupt controller
* connected to ITS converting wired interrupts into MSI, so we
* use "num-pins" to alloc MSI vectors which are needed by client
* devices connected to it.
*
* Here is the DSDT device node used for mbigen in firmware:
* Device(MBI0) {
* Name(_HID, "HISI0152")
* Name(_UID, Zero)
* Name(_CRS, ResourceTemplate() {
* Memory32Fixed(ReadWrite, 0xa0080000, 0x10000)
* })
*
* Name(_DSD, Package () {
* ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
* Package () {
* Package () {"num-pins", 378}
* }
* })
* }
*/
ret = device_property_read_u32(&pdev->dev, "num-pins", &num_pins);
if (ret || num_pins == 0)
return -EINVAL;
domain = platform_msi_create_device_domain(&pdev->dev, num_pins,
mbigen_write_msg,
&mbigen_domain_ops,
mgn_chip);
if (!domain)
return -ENOMEM;
return 0;
}
#else
static inline int mbigen_acpi_create_domain(struct platform_device *pdev,
struct mbigen_device *mgn_chip)
{
return -ENODEV;
}
#endif
static int mbigen_device_probe(struct platform_device *pdev)
{
struct mbigen_device *mgn_chip;
struct resource *res;
int err;
mgn_chip = devm_kzalloc(&pdev->dev, sizeof(*mgn_chip), GFP_KERNEL);
if (!mgn_chip)
return -ENOMEM;
mgn_chip->pdev = pdev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -EINVAL;
mgn_chip->base = devm_ioremap(&pdev->dev, res->start,
resource_size(res));
if (!mgn_chip->base) {
dev_err(&pdev->dev, "failed to ioremap %pR\n", res);
return -ENOMEM;
}
if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node)
err = mbigen_of_create_domain(pdev, mgn_chip);
else if (ACPI_COMPANION(&pdev->dev))
err = mbigen_acpi_create_domain(pdev, mgn_chip);
else
err = -EINVAL;
if (err) {
dev_err(&pdev->dev, "Failed to create mbi-gen irqdomain\n");
return err;
}
platform_set_drvdata(pdev, mgn_chip);
return 0;
}
static const struct of_device_id mbigen_of_match[] = {
{ .compatible = "hisilicon,mbigen-v2" },
{ /* END */ }
};
MODULE_DEVICE_TABLE(of, mbigen_of_match);
static const struct acpi_device_id mbigen_acpi_match[] = {
{ "HISI0152", 0 },
{}
};
MODULE_DEVICE_TABLE(acpi, mbigen_acpi_match);
static struct platform_driver mbigen_platform_driver = {
.driver = {
.name = "Hisilicon MBIGEN-V2",
.of_match_table = mbigen_of_match,
.acpi_match_table = ACPI_PTR(mbigen_acpi_match),
},
.probe = mbigen_device_probe,
};
module_platform_driver(mbigen_platform_driver);
MODULE_AUTHOR("Jun Ma <majun258@huawei.com>");
MODULE_AUTHOR("Yun Wu <wuyun.wu@huawei.com>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Hisilicon MBI Generator driver");
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