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// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/module.h>
#include <linux/irqdomain.h>
#include <linux/irqchip.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/smp.h>
#include <linux/io.h>
#include <asm/irq.h>
#include <asm/traps.h>
#include <asm/reg_ops.h>
static struct irq_domain *root_domain;
static void __iomem *INTCG_base;
static void __iomem *INTCL_base;
#define IPI_IRQ 15
#define INTC_IRQS 256
#define COMM_IRQ_BASE 32
#define INTCG_SIZE 0x8000
#define INTCL_SIZE 0x1000
#define INTCG_ICTLR 0x0
#define INTCG_CICFGR 0x100
#define INTCG_CIDSTR 0x1000
#define INTCL_PICTLR 0x0
#define INTCL_SIGR 0x60
#define INTCL_HPPIR 0x68
#define INTCL_RDYIR 0x6c
#define INTCL_SENR 0xa0
#define INTCL_CENR 0xa4
#define INTCL_CACR 0xb4
static DEFINE_PER_CPU(void __iomem *, intcl_reg);
static void csky_mpintc_handler(struct pt_regs *regs)
{
void __iomem *reg_base = this_cpu_read(intcl_reg);
do {
handle_domain_irq(root_domain,
readl_relaxed(reg_base + INTCL_RDYIR),
regs);
} while (readl_relaxed(reg_base + INTCL_HPPIR) & BIT(31));
}
static void csky_mpintc_enable(struct irq_data *d)
{
void __iomem *reg_base = this_cpu_read(intcl_reg);
writel_relaxed(d->hwirq, reg_base + INTCL_SENR);
}
static void csky_mpintc_disable(struct irq_data *d)
{
void __iomem *reg_base = this_cpu_read(intcl_reg);
writel_relaxed(d->hwirq, reg_base + INTCL_CENR);
}
static void csky_mpintc_eoi(struct irq_data *d)
{
void __iomem *reg_base = this_cpu_read(intcl_reg);
writel_relaxed(d->hwirq, reg_base + INTCL_CACR);
}
#ifdef CONFIG_SMP
static int csky_irq_set_affinity(struct irq_data *d,
const struct cpumask *mask_val,
bool force)
{
unsigned int cpu;
unsigned int offset = 4 * (d->hwirq - COMM_IRQ_BASE);
if (!force)
cpu = cpumask_any_and(mask_val, cpu_online_mask);
else
cpu = cpumask_first(mask_val);
if (cpu >= nr_cpu_ids)
return -EINVAL;
/*
* The csky,mpintc could support auto irq deliver, but it only
* could deliver external irq to one cpu or all cpus. So it
* doesn't support deliver external irq to a group of cpus
* with cpu_mask.
* SO we only use auto deliver mode when affinity mask_val is
* equal to cpu_present_mask.
*
*/
if (cpumask_equal(mask_val, cpu_present_mask))
cpu = 0;
else
cpu |= BIT(31);
writel_relaxed(cpu, INTCG_base + INTCG_CIDSTR + offset);
irq_data_update_effective_affinity(d, cpumask_of(cpu));
return IRQ_SET_MASK_OK_DONE;
}
#endif
static struct irq_chip csky_irq_chip = {
.name = "C-SKY SMP Intc",
.irq_eoi = csky_mpintc_eoi,
.irq_enable = csky_mpintc_enable,
.irq_disable = csky_mpintc_disable,
#ifdef CONFIG_SMP
.irq_set_affinity = csky_irq_set_affinity,
#endif
};
static int csky_irqdomain_map(struct irq_domain *d, unsigned int irq,
irq_hw_number_t hwirq)
{
if (hwirq < COMM_IRQ_BASE) {
irq_set_percpu_devid(irq);
irq_set_chip_and_handler(irq, &csky_irq_chip,
handle_percpu_irq);
} else {
irq_set_chip_and_handler(irq, &csky_irq_chip,
handle_fasteoi_irq);
}
return 0;
}
static const struct irq_domain_ops csky_irqdomain_ops = {
.map = csky_irqdomain_map,
.xlate = irq_domain_xlate_onecell,
};
#ifdef CONFIG_SMP
static void csky_mpintc_send_ipi(const struct cpumask *mask)
{
void __iomem *reg_base = this_cpu_read(intcl_reg);
/*
* INTCL_SIGR[3:0] INTID
* INTCL_SIGR[8:15] CPUMASK
*/
writel_relaxed((*cpumask_bits(mask)) << 8 | IPI_IRQ,
reg_base + INTCL_SIGR);
}
#endif
/* C-SKY multi processor interrupt controller */
static int __init
csky_mpintc_init(struct device_node *node, struct device_node *parent)
{
int ret;
unsigned int cpu, nr_irq;
#ifdef CONFIG_SMP
unsigned int ipi_irq;
#endif
if (parent)
return 0;
ret = of_property_read_u32(node, "csky,num-irqs", &nr_irq);
if (ret < 0)
nr_irq = INTC_IRQS;
if (INTCG_base == NULL) {
INTCG_base = ioremap(mfcr("cr<31, 14>"),
INTCL_SIZE*nr_cpu_ids + INTCG_SIZE);
if (INTCG_base == NULL)
return -EIO;
INTCL_base = INTCG_base + INTCG_SIZE;
writel_relaxed(BIT(0), INTCG_base + INTCG_ICTLR);
}
root_domain = irq_domain_add_linear(node, nr_irq, &csky_irqdomain_ops,
NULL);
if (!root_domain)
return -ENXIO;
/* for every cpu */
for_each_present_cpu(cpu) {
per_cpu(intcl_reg, cpu) = INTCL_base + (INTCL_SIZE * cpu);
writel_relaxed(BIT(0), per_cpu(intcl_reg, cpu) + INTCL_PICTLR);
}
set_handle_irq(&csky_mpintc_handler);
#ifdef CONFIG_SMP
ipi_irq = irq_create_mapping(root_domain, IPI_IRQ);
if (!ipi_irq)
return -EIO;
set_send_ipi(&csky_mpintc_send_ipi, ipi_irq);
#endif
return 0;
}
IRQCHIP_DECLARE(csky_mpintc, "csky,mpintc", csky_mpintc_init);
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