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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2020 Birger Koblitz <mail@birger-koblitz.de>
* Copyright (C) 2020 Bert Vermeulen <bert@biot.com>
* Copyright (C) 2020 John Crispin <john@phrozen.org>
*/
#include <linux/of_irq.h>
#include <linux/irqchip.h>
#include <linux/spinlock.h>
#include <linux/of_address.h>
#include <linux/irqchip/chained_irq.h>
/* Global Interrupt Mask Register */
#define RTL_ICTL_GIMR 0x00
/* Global Interrupt Status Register */
#define RTL_ICTL_GISR 0x04
/* Interrupt Routing Registers */
#define RTL_ICTL_IRR0 0x08
#define RTL_ICTL_IRR1 0x0c
#define RTL_ICTL_IRR2 0x10
#define RTL_ICTL_IRR3 0x14
#define REG(x) (realtek_ictl_base + x)
static DEFINE_RAW_SPINLOCK(irq_lock);
static void __iomem *realtek_ictl_base;
static void realtek_ictl_unmask_irq(struct irq_data *i)
{
unsigned long flags;
u32 value;
raw_spin_lock_irqsave(&irq_lock, flags);
value = readl(REG(RTL_ICTL_GIMR));
value |= BIT(i->hwirq);
writel(value, REG(RTL_ICTL_GIMR));
raw_spin_unlock_irqrestore(&irq_lock, flags);
}
static void realtek_ictl_mask_irq(struct irq_data *i)
{
unsigned long flags;
u32 value;
raw_spin_lock_irqsave(&irq_lock, flags);
value = readl(REG(RTL_ICTL_GIMR));
value &= ~BIT(i->hwirq);
writel(value, REG(RTL_ICTL_GIMR));
raw_spin_unlock_irqrestore(&irq_lock, flags);
}
static struct irq_chip realtek_ictl_irq = {
.name = "realtek-rtl-intc",
.irq_mask = realtek_ictl_mask_irq,
.irq_unmask = realtek_ictl_unmask_irq,
};
static int intc_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
{
irq_set_chip_and_handler(hw, &realtek_ictl_irq, handle_level_irq);
return 0;
}
static const struct irq_domain_ops irq_domain_ops = {
.map = intc_map,
.xlate = irq_domain_xlate_onecell,
};
static void realtek_irq_dispatch(struct irq_desc *desc)
{
struct irq_chip *chip = irq_desc_get_chip(desc);
struct irq_domain *domain;
unsigned int pending;
chained_irq_enter(chip, desc);
pending = readl(REG(RTL_ICTL_GIMR)) & readl(REG(RTL_ICTL_GISR));
if (unlikely(!pending)) {
spurious_interrupt();
goto out;
}
domain = irq_desc_get_handler_data(desc);
generic_handle_irq(irq_find_mapping(domain, __ffs(pending)));
out:
chained_irq_exit(chip, desc);
}
/*
* SoC interrupts are cascaded to MIPS CPU interrupts according to the
* interrupt-map in the device tree. Each SoC interrupt gets 4 bits for
* the CPU interrupt in an Interrupt Routing Register. Max 32 SoC interrupts
* thus go into 4 IRRs.
*/
static int __init map_interrupts(struct device_node *node, struct irq_domain *domain)
{
struct device_node *cpu_ictl;
const __be32 *imap;
u32 imaplen, soc_int, cpu_int, tmp, regs[4];
int ret, i, irr_regs[] = {
RTL_ICTL_IRR3,
RTL_ICTL_IRR2,
RTL_ICTL_IRR1,
RTL_ICTL_IRR0,
};
u8 mips_irqs_set;
ret = of_property_read_u32(node, "#address-cells", &tmp);
if (ret || tmp)
return -EINVAL;
imap = of_get_property(node, "interrupt-map", &imaplen);
if (!imap || imaplen % 3)
return -EINVAL;
mips_irqs_set = 0;
memset(regs, 0, sizeof(regs));
for (i = 0; i < imaplen; i += 3 * sizeof(u32)) {
soc_int = be32_to_cpup(imap);
if (soc_int > 31)
return -EINVAL;
cpu_ictl = of_find_node_by_phandle(be32_to_cpup(imap + 1));
if (!cpu_ictl)
return -EINVAL;
ret = of_property_read_u32(cpu_ictl, "#interrupt-cells", &tmp);
if (ret || tmp != 1)
return -EINVAL;
of_node_put(cpu_ictl);
cpu_int = be32_to_cpup(imap + 2);
if (cpu_int > 7)
return -EINVAL;
if (!(mips_irqs_set & BIT(cpu_int))) {
irq_set_chained_handler_and_data(cpu_int, realtek_irq_dispatch,
domain);
mips_irqs_set |= BIT(cpu_int);
}
regs[(soc_int * 4) / 32] |= cpu_int << (soc_int * 4) % 32;
imap += 3;
}
for (i = 0; i < 4; i++)
writel(regs[i], REG(irr_regs[i]));
return 0;
}
static int __init realtek_rtl_of_init(struct device_node *node, struct device_node *parent)
{
struct irq_domain *domain;
int ret;
realtek_ictl_base = of_iomap(node, 0);
if (!realtek_ictl_base)
return -ENXIO;
/* Disable all cascaded interrupts */
writel(0, REG(RTL_ICTL_GIMR));
domain = irq_domain_add_simple(node, 32, 0,
&irq_domain_ops, NULL);
ret = map_interrupts(node, domain);
if (ret) {
pr_err("invalid interrupt map\n");
return ret;
}
return 0;
}
IRQCHIP_DECLARE(realtek_rtl_intc, "realtek,rtl-intc", realtek_rtl_of_init);
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