mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-30 07:34:12 +08:00
1fb51c975a
In case of error, the function of_io_request_and_map() returns ERR_PTR()
and never returns NULL. The NULL test in the return value check should
be replaced with IS_ERR().
Fixes: d852e62ad6 ("irqchip: Add RDA8810PL interrupt driver")
Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
108 lines
2.5 KiB
C
108 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* RDA8810PL SoC irqchip driver
|
|
*
|
|
* Copyright RDA Microelectronics Company Limited
|
|
* Copyright (c) 2017 Andreas Färber
|
|
* Copyright (c) 2018 Manivannan Sadhasivam
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/irqchip.h>
|
|
#include <linux/irqdomain.h>
|
|
#include <linux/of_address.h>
|
|
|
|
#include <asm/exception.h>
|
|
|
|
#define RDA_INTC_FINALSTATUS 0x00
|
|
#define RDA_INTC_MASK_SET 0x08
|
|
#define RDA_INTC_MASK_CLR 0x0c
|
|
|
|
#define RDA_IRQ_MASK_ALL 0xFFFFFFFF
|
|
|
|
#define RDA_NR_IRQS 32
|
|
|
|
static void __iomem *rda_intc_base;
|
|
static struct irq_domain *rda_irq_domain;
|
|
|
|
static void rda_intc_mask_irq(struct irq_data *d)
|
|
{
|
|
writel_relaxed(BIT(d->hwirq), rda_intc_base + RDA_INTC_MASK_CLR);
|
|
}
|
|
|
|
static void rda_intc_unmask_irq(struct irq_data *d)
|
|
{
|
|
writel_relaxed(BIT(d->hwirq), rda_intc_base + RDA_INTC_MASK_SET);
|
|
}
|
|
|
|
static int rda_intc_set_type(struct irq_data *data, unsigned int flow_type)
|
|
{
|
|
/* Hardware supports only level triggered interrupts */
|
|
if ((flow_type & (IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW)) == flow_type)
|
|
return 0;
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static void __exception_irq_entry rda_handle_irq(struct pt_regs *regs)
|
|
{
|
|
u32 stat = readl_relaxed(rda_intc_base + RDA_INTC_FINALSTATUS);
|
|
u32 hwirq;
|
|
|
|
while (stat) {
|
|
hwirq = __fls(stat);
|
|
handle_domain_irq(rda_irq_domain, hwirq, regs);
|
|
stat &= ~BIT(hwirq);
|
|
}
|
|
}
|
|
|
|
static struct irq_chip rda_irq_chip = {
|
|
.name = "rda-intc",
|
|
.irq_mask = rda_intc_mask_irq,
|
|
.irq_unmask = rda_intc_unmask_irq,
|
|
.irq_set_type = rda_intc_set_type,
|
|
};
|
|
|
|
static int rda_irq_map(struct irq_domain *d,
|
|
unsigned int virq, irq_hw_number_t hw)
|
|
{
|
|
irq_set_status_flags(virq, IRQ_LEVEL);
|
|
irq_set_chip_and_handler(virq, &rda_irq_chip, handle_level_irq);
|
|
irq_set_chip_data(virq, d->host_data);
|
|
irq_set_probe(virq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct irq_domain_ops rda_irq_domain_ops = {
|
|
.map = rda_irq_map,
|
|
.xlate = irq_domain_xlate_onecell,
|
|
};
|
|
|
|
static int __init rda8810_intc_init(struct device_node *node,
|
|
struct device_node *parent)
|
|
{
|
|
rda_intc_base = of_io_request_and_map(node, 0, "rda-intc");
|
|
if (IS_ERR(rda_intc_base))
|
|
return PTR_ERR(rda_intc_base);
|
|
|
|
/* Mask all interrupt sources */
|
|
writel_relaxed(RDA_IRQ_MASK_ALL, rda_intc_base + RDA_INTC_MASK_CLR);
|
|
|
|
rda_irq_domain = irq_domain_create_linear(&node->fwnode, RDA_NR_IRQS,
|
|
&rda_irq_domain_ops,
|
|
rda_intc_base);
|
|
if (!rda_irq_domain) {
|
|
iounmap(rda_intc_base);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
set_handle_irq(rda_handle_irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
IRQCHIP_DECLARE(rda_intc, "rda,8810pl-intc", rda8810_intc_init);
|