linux/drivers/irqchip/irq-imx-irqsteer.c
Lucas Stach 0136afa089 irqchip: Add driver for imx-irqsteer controller
The irqsteer block is a interrupt multiplexer/remapper found on the
i.MX8 line of SoCs.

Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2018-12-18 15:37:22 +00:00

262 lines
6.7 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2017 NXP
* Copyright (C) 2018 Pengutronix, Lucas Stach <kernel@pengutronix.de>
*/
#include <linux/clk.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/irqdomain.h>
#include <linux/kernel.h>
#include <linux/of_platform.h>
#include <linux/spinlock.h>
#define CTRL_STRIDE_OFF(_t, _r) (_t * 8 * _r)
#define CHANCTRL 0x0
#define CHANMASK(n, t) (CTRL_STRIDE_OFF(t, 0) + 0x4 * (n) + 0x4)
#define CHANSET(n, t) (CTRL_STRIDE_OFF(t, 1) + 0x4 * (n) + 0x4)
#define CHANSTATUS(n, t) (CTRL_STRIDE_OFF(t, 2) + 0x4 * (n) + 0x4)
#define CHAN_MINTDIS(t) (CTRL_STRIDE_OFF(t, 3) + 0x4)
#define CHAN_MASTRSTAT(t) (CTRL_STRIDE_OFF(t, 3) + 0x8)
struct irqsteer_data {
void __iomem *regs;
struct clk *ipg_clk;
int irq;
raw_spinlock_t lock;
int irq_groups;
int channel;
struct irq_domain *domain;
u32 *saved_reg;
};
static int imx_irqsteer_get_reg_index(struct irqsteer_data *data,
unsigned long irqnum)
{
return (data->irq_groups * 2 - irqnum / 32 - 1);
}
static void imx_irqsteer_irq_unmask(struct irq_data *d)
{
struct irqsteer_data *data = d->chip_data;
int idx = imx_irqsteer_get_reg_index(data, d->hwirq);
unsigned long flags;
u32 val;
raw_spin_lock_irqsave(&data->lock, flags);
val = readl_relaxed(data->regs + CHANMASK(idx, data->irq_groups));
val |= BIT(d->hwirq % 32);
writel_relaxed(val, data->regs + CHANMASK(idx, data->irq_groups));
raw_spin_unlock_irqrestore(&data->lock, flags);
}
static void imx_irqsteer_irq_mask(struct irq_data *d)
{
struct irqsteer_data *data = d->chip_data;
int idx = imx_irqsteer_get_reg_index(data, d->hwirq);
unsigned long flags;
u32 val;
raw_spin_lock_irqsave(&data->lock, flags);
val = readl_relaxed(data->regs + CHANMASK(idx, data->irq_groups));
val &= ~BIT(d->hwirq % 32);
writel_relaxed(val, data->regs + CHANMASK(idx, data->irq_groups));
raw_spin_unlock_irqrestore(&data->lock, flags);
}
static struct irq_chip imx_irqsteer_irq_chip = {
.name = "irqsteer",
.irq_mask = imx_irqsteer_irq_mask,
.irq_unmask = imx_irqsteer_irq_unmask,
};
static int imx_irqsteer_irq_map(struct irq_domain *h, unsigned int irq,
irq_hw_number_t hwirq)
{
irq_set_status_flags(irq, IRQ_LEVEL);
irq_set_chip_data(irq, h->host_data);
irq_set_chip_and_handler(irq, &imx_irqsteer_irq_chip, handle_level_irq);
return 0;
}
static const struct irq_domain_ops imx_irqsteer_domain_ops = {
.map = imx_irqsteer_irq_map,
.xlate = irq_domain_xlate_onecell,
};
static void imx_irqsteer_irq_handler(struct irq_desc *desc)
{
struct irqsteer_data *data = irq_desc_get_handler_data(desc);
int i;
chained_irq_enter(irq_desc_get_chip(desc), desc);
for (i = 0; i < data->irq_groups * 64; i += 32) {
int idx = imx_irqsteer_get_reg_index(data, i);
unsigned long irqmap;
int pos, virq;
irqmap = readl_relaxed(data->regs +
CHANSTATUS(idx, data->irq_groups));
for_each_set_bit(pos, &irqmap, 32) {
virq = irq_find_mapping(data->domain, pos + i);
if (virq)
generic_handle_irq(virq);
}
}
chained_irq_exit(irq_desc_get_chip(desc), desc);
}
static int imx_irqsteer_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct irqsteer_data *data;
struct resource *res;
int ret;
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
data->regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(data->regs)) {
dev_err(&pdev->dev, "failed to initialize reg\n");
return PTR_ERR(data->regs);
}
data->irq = platform_get_irq(pdev, 0);
if (data->irq <= 0) {
dev_err(&pdev->dev, "failed to get irq\n");
return -ENODEV;
}
data->ipg_clk = devm_clk_get(&pdev->dev, "ipg");
if (IS_ERR(data->ipg_clk)) {
ret = PTR_ERR(data->ipg_clk);
if (ret != -EPROBE_DEFER)
dev_err(&pdev->dev, "failed to get ipg clk: %d\n", ret);
return ret;
}
raw_spin_lock_init(&data->lock);
of_property_read_u32(np, "fsl,irq-groups", &data->irq_groups);
of_property_read_u32(np, "fsl,channel", &data->channel);
if (IS_ENABLED(CONFIG_PM_SLEEP)) {
data->saved_reg = devm_kzalloc(&pdev->dev,
sizeof(u32) * data->irq_groups * 2,
GFP_KERNEL);
if (!data->saved_reg)
return -ENOMEM;
}
ret = clk_prepare_enable(data->ipg_clk);
if (ret) {
dev_err(&pdev->dev, "failed to enable ipg clk: %d\n", ret);
return ret;
}
/* steer all IRQs into configured channel */
writel_relaxed(BIT(data->channel), data->regs + CHANCTRL);
data->domain = irq_domain_add_linear(np, data->irq_groups * 64,
&imx_irqsteer_domain_ops, data);
if (!data->domain) {
dev_err(&pdev->dev, "failed to create IRQ domain\n");
clk_disable_unprepare(data->ipg_clk);
return -ENOMEM;
}
irq_set_chained_handler_and_data(data->irq, imx_irqsteer_irq_handler,
data);
platform_set_drvdata(pdev, data);
return 0;
}
static int imx_irqsteer_remove(struct platform_device *pdev)
{
struct irqsteer_data *irqsteer_data = platform_get_drvdata(pdev);
irq_set_chained_handler_and_data(irqsteer_data->irq, NULL, NULL);
irq_domain_remove(irqsteer_data->domain);
clk_disable_unprepare(irqsteer_data->ipg_clk);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static void imx_irqsteer_save_regs(struct irqsteer_data *data)
{
int i;
for (i = 0; i < data->irq_groups * 2; i++)
data->saved_reg[i] = readl_relaxed(data->regs +
CHANMASK(i, data->irq_groups));
}
static void imx_irqsteer_restore_regs(struct irqsteer_data *data)
{
int i;
writel_relaxed(BIT(data->channel), data->regs + CHANCTRL);
for (i = 0; i < data->irq_groups * 2; i++)
writel_relaxed(data->saved_reg[i],
data->regs + CHANMASK(i, data->irq_groups));
}
static int imx_irqsteer_suspend(struct device *dev)
{
struct irqsteer_data *irqsteer_data = dev_get_drvdata(dev);
imx_irqsteer_save_regs(irqsteer_data);
clk_disable_unprepare(irqsteer_data->ipg_clk);
return 0;
}
static int imx_irqsteer_resume(struct device *dev)
{
struct irqsteer_data *irqsteer_data = dev_get_drvdata(dev);
int ret;
ret = clk_prepare_enable(irqsteer_data->ipg_clk);
if (ret) {
dev_err(dev, "failed to enable ipg clk: %d\n", ret);
return ret;
}
imx_irqsteer_restore_regs(irqsteer_data);
return 0;
}
#endif
static const struct dev_pm_ops imx_irqsteer_pm_ops = {
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(imx_irqsteer_suspend, imx_irqsteer_resume)
};
static const struct of_device_id imx_irqsteer_dt_ids[] = {
{ .compatible = "fsl,imx-irqsteer", },
{},
};
static struct platform_driver imx_irqsteer_driver = {
.driver = {
.name = "imx-irqsteer",
.of_match_table = imx_irqsteer_dt_ids,
.pm = &imx_irqsteer_pm_ops,
},
.probe = imx_irqsteer_probe,
.remove = imx_irqsteer_remove,
};
builtin_platform_driver(imx_irqsteer_driver);