mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
![Hao Fang](/assets/img/avatar_default.png)
s/Hisilicon/HiSilicon/ It should use capital S, according to https://www.hisilicon.com/en/terms-of-use. Signed-off-by: Hao Fang <fanghao11@huawei.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/1617086780-8521-1-git-send-email-fanghao11@huawei.com
406 lines
10 KiB
C
406 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* HiSilicon HiP04 INTC
|
|
*
|
|
* Copyright (C) 2002-2014 ARM Limited.
|
|
* Copyright (c) 2013-2014 HiSilicon Ltd.
|
|
* Copyright (c) 2013-2014 Linaro Ltd.
|
|
*
|
|
* Interrupt architecture for the HIP04 INTC:
|
|
*
|
|
* o There is one Interrupt Distributor, which receives interrupts
|
|
* from system devices and sends them to the Interrupt Controllers.
|
|
*
|
|
* o There is one CPU Interface per CPU, which sends interrupts sent
|
|
* by the Distributor, and interrupts generated locally, to the
|
|
* associated CPU. The base address of the CPU interface is usually
|
|
* aliased so that the same address points to different chips depending
|
|
* on the CPU it is accessed from.
|
|
*
|
|
* Note that IRQs 0-31 are special - they are local to each CPU.
|
|
* As such, the enable set/clear, pending set/clear and active bit
|
|
* registers are banked per-cpu for these sources.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/err.h>
|
|
#include <linux/module.h>
|
|
#include <linux/list.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/cpu_pm.h>
|
|
#include <linux/cpumask.h>
|
|
#include <linux/io.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_irq.h>
|
|
#include <linux/irqdomain.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/irqchip.h>
|
|
#include <linux/irqchip/arm-gic.h>
|
|
|
|
#include <asm/irq.h>
|
|
#include <asm/exception.h>
|
|
#include <asm/smp_plat.h>
|
|
|
|
#include "irq-gic-common.h"
|
|
|
|
#define HIP04_MAX_IRQS 510
|
|
|
|
struct hip04_irq_data {
|
|
void __iomem *dist_base;
|
|
void __iomem *cpu_base;
|
|
struct irq_domain *domain;
|
|
unsigned int nr_irqs;
|
|
};
|
|
|
|
static DEFINE_RAW_SPINLOCK(irq_controller_lock);
|
|
|
|
/*
|
|
* The GIC mapping of CPU interfaces does not necessarily match
|
|
* the logical CPU numbering. Let's use a mapping as returned
|
|
* by the GIC itself.
|
|
*/
|
|
#define NR_HIP04_CPU_IF 16
|
|
static u16 hip04_cpu_map[NR_HIP04_CPU_IF] __read_mostly;
|
|
|
|
static struct hip04_irq_data hip04_data __read_mostly;
|
|
|
|
static inline void __iomem *hip04_dist_base(struct irq_data *d)
|
|
{
|
|
struct hip04_irq_data *hip04_data = irq_data_get_irq_chip_data(d);
|
|
return hip04_data->dist_base;
|
|
}
|
|
|
|
static inline void __iomem *hip04_cpu_base(struct irq_data *d)
|
|
{
|
|
struct hip04_irq_data *hip04_data = irq_data_get_irq_chip_data(d);
|
|
return hip04_data->cpu_base;
|
|
}
|
|
|
|
static inline unsigned int hip04_irq(struct irq_data *d)
|
|
{
|
|
return d->hwirq;
|
|
}
|
|
|
|
/*
|
|
* Routines to acknowledge, disable and enable interrupts
|
|
*/
|
|
static void hip04_mask_irq(struct irq_data *d)
|
|
{
|
|
u32 mask = 1 << (hip04_irq(d) % 32);
|
|
|
|
raw_spin_lock(&irq_controller_lock);
|
|
writel_relaxed(mask, hip04_dist_base(d) + GIC_DIST_ENABLE_CLEAR +
|
|
(hip04_irq(d) / 32) * 4);
|
|
raw_spin_unlock(&irq_controller_lock);
|
|
}
|
|
|
|
static void hip04_unmask_irq(struct irq_data *d)
|
|
{
|
|
u32 mask = 1 << (hip04_irq(d) % 32);
|
|
|
|
raw_spin_lock(&irq_controller_lock);
|
|
writel_relaxed(mask, hip04_dist_base(d) + GIC_DIST_ENABLE_SET +
|
|
(hip04_irq(d) / 32) * 4);
|
|
raw_spin_unlock(&irq_controller_lock);
|
|
}
|
|
|
|
static void hip04_eoi_irq(struct irq_data *d)
|
|
{
|
|
writel_relaxed(hip04_irq(d), hip04_cpu_base(d) + GIC_CPU_EOI);
|
|
}
|
|
|
|
static int hip04_irq_set_type(struct irq_data *d, unsigned int type)
|
|
{
|
|
void __iomem *base = hip04_dist_base(d);
|
|
unsigned int irq = hip04_irq(d);
|
|
int ret;
|
|
|
|
/* Interrupt configuration for SGIs can't be changed */
|
|
if (irq < 16)
|
|
return -EINVAL;
|
|
|
|
/* SPIs have restrictions on the supported types */
|
|
if (irq >= 32 && type != IRQ_TYPE_LEVEL_HIGH &&
|
|
type != IRQ_TYPE_EDGE_RISING)
|
|
return -EINVAL;
|
|
|
|
raw_spin_lock(&irq_controller_lock);
|
|
|
|
ret = gic_configure_irq(irq, type, base + GIC_DIST_CONFIG, NULL);
|
|
if (ret && irq < 32) {
|
|
/* Misconfigured PPIs are usually not fatal */
|
|
pr_warn("GIC: PPI%d is secure or misconfigured\n", irq - 16);
|
|
ret = 0;
|
|
}
|
|
|
|
raw_spin_unlock(&irq_controller_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
static int hip04_irq_set_affinity(struct irq_data *d,
|
|
const struct cpumask *mask_val,
|
|
bool force)
|
|
{
|
|
void __iomem *reg;
|
|
unsigned int cpu, shift = (hip04_irq(d) % 2) * 16;
|
|
u32 val, mask, bit;
|
|
|
|
if (!force)
|
|
cpu = cpumask_any_and(mask_val, cpu_online_mask);
|
|
else
|
|
cpu = cpumask_first(mask_val);
|
|
|
|
if (cpu >= NR_HIP04_CPU_IF || cpu >= nr_cpu_ids)
|
|
return -EINVAL;
|
|
|
|
raw_spin_lock(&irq_controller_lock);
|
|
reg = hip04_dist_base(d) + GIC_DIST_TARGET + ((hip04_irq(d) * 2) & ~3);
|
|
mask = 0xffff << shift;
|
|
bit = hip04_cpu_map[cpu] << shift;
|
|
val = readl_relaxed(reg) & ~mask;
|
|
writel_relaxed(val | bit, reg);
|
|
raw_spin_unlock(&irq_controller_lock);
|
|
|
|
irq_data_update_effective_affinity(d, cpumask_of(cpu));
|
|
|
|
return IRQ_SET_MASK_OK;
|
|
}
|
|
|
|
static void hip04_ipi_send_mask(struct irq_data *d, const struct cpumask *mask)
|
|
{
|
|
int cpu;
|
|
unsigned long flags, map = 0;
|
|
|
|
raw_spin_lock_irqsave(&irq_controller_lock, flags);
|
|
|
|
/* Convert our logical CPU mask into a physical one. */
|
|
for_each_cpu(cpu, mask)
|
|
map |= hip04_cpu_map[cpu];
|
|
|
|
/*
|
|
* Ensure that stores to Normal memory are visible to the
|
|
* other CPUs before they observe us issuing the IPI.
|
|
*/
|
|
dmb(ishst);
|
|
|
|
/* this always happens on GIC0 */
|
|
writel_relaxed(map << 8 | d->hwirq, hip04_data.dist_base + GIC_DIST_SOFTINT);
|
|
|
|
raw_spin_unlock_irqrestore(&irq_controller_lock, flags);
|
|
}
|
|
#endif
|
|
|
|
static void __exception_irq_entry hip04_handle_irq(struct pt_regs *regs)
|
|
{
|
|
u32 irqstat, irqnr;
|
|
void __iomem *cpu_base = hip04_data.cpu_base;
|
|
|
|
do {
|
|
irqstat = readl_relaxed(cpu_base + GIC_CPU_INTACK);
|
|
irqnr = irqstat & GICC_IAR_INT_ID_MASK;
|
|
|
|
if (irqnr <= HIP04_MAX_IRQS)
|
|
handle_domain_irq(hip04_data.domain, irqnr, regs);
|
|
} while (irqnr > HIP04_MAX_IRQS);
|
|
}
|
|
|
|
static struct irq_chip hip04_irq_chip = {
|
|
.name = "HIP04 INTC",
|
|
.irq_mask = hip04_mask_irq,
|
|
.irq_unmask = hip04_unmask_irq,
|
|
.irq_eoi = hip04_eoi_irq,
|
|
.irq_set_type = hip04_irq_set_type,
|
|
#ifdef CONFIG_SMP
|
|
.irq_set_affinity = hip04_irq_set_affinity,
|
|
.ipi_send_mask = hip04_ipi_send_mask,
|
|
#endif
|
|
.flags = IRQCHIP_SET_TYPE_MASKED |
|
|
IRQCHIP_SKIP_SET_WAKE |
|
|
IRQCHIP_MASK_ON_SUSPEND,
|
|
};
|
|
|
|
static u16 hip04_get_cpumask(struct hip04_irq_data *intc)
|
|
{
|
|
void __iomem *base = intc->dist_base;
|
|
u32 mask, i;
|
|
|
|
for (i = mask = 0; i < 32; i += 2) {
|
|
mask = readl_relaxed(base + GIC_DIST_TARGET + i * 2);
|
|
mask |= mask >> 16;
|
|
if (mask)
|
|
break;
|
|
}
|
|
|
|
if (!mask)
|
|
pr_crit("GIC CPU mask not found - kernel will fail to boot.\n");
|
|
|
|
return mask;
|
|
}
|
|
|
|
static void __init hip04_irq_dist_init(struct hip04_irq_data *intc)
|
|
{
|
|
unsigned int i;
|
|
u32 cpumask;
|
|
unsigned int nr_irqs = intc->nr_irqs;
|
|
void __iomem *base = intc->dist_base;
|
|
|
|
writel_relaxed(0, base + GIC_DIST_CTRL);
|
|
|
|
/*
|
|
* Set all global interrupts to this CPU only.
|
|
*/
|
|
cpumask = hip04_get_cpumask(intc);
|
|
cpumask |= cpumask << 16;
|
|
for (i = 32; i < nr_irqs; i += 2)
|
|
writel_relaxed(cpumask, base + GIC_DIST_TARGET + ((i * 2) & ~3));
|
|
|
|
gic_dist_config(base, nr_irqs, NULL);
|
|
|
|
writel_relaxed(1, base + GIC_DIST_CTRL);
|
|
}
|
|
|
|
static void hip04_irq_cpu_init(struct hip04_irq_data *intc)
|
|
{
|
|
void __iomem *dist_base = intc->dist_base;
|
|
void __iomem *base = intc->cpu_base;
|
|
unsigned int cpu_mask, cpu = smp_processor_id();
|
|
int i;
|
|
|
|
/*
|
|
* Get what the GIC says our CPU mask is.
|
|
*/
|
|
BUG_ON(cpu >= NR_HIP04_CPU_IF);
|
|
cpu_mask = hip04_get_cpumask(intc);
|
|
hip04_cpu_map[cpu] = cpu_mask;
|
|
|
|
/*
|
|
* Clear our mask from the other map entries in case they're
|
|
* still undefined.
|
|
*/
|
|
for (i = 0; i < NR_HIP04_CPU_IF; i++)
|
|
if (i != cpu)
|
|
hip04_cpu_map[i] &= ~cpu_mask;
|
|
|
|
gic_cpu_config(dist_base, 32, NULL);
|
|
|
|
writel_relaxed(0xf0, base + GIC_CPU_PRIMASK);
|
|
writel_relaxed(1, base + GIC_CPU_CTRL);
|
|
}
|
|
|
|
static int hip04_irq_domain_map(struct irq_domain *d, unsigned int irq,
|
|
irq_hw_number_t hw)
|
|
{
|
|
if (hw < 32) {
|
|
irq_set_percpu_devid(irq);
|
|
irq_set_chip_and_handler(irq, &hip04_irq_chip,
|
|
handle_percpu_devid_irq);
|
|
} else {
|
|
irq_set_chip_and_handler(irq, &hip04_irq_chip,
|
|
handle_fasteoi_irq);
|
|
irq_set_probe(irq);
|
|
irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(irq)));
|
|
}
|
|
irq_set_chip_data(irq, d->host_data);
|
|
return 0;
|
|
}
|
|
|
|
static int hip04_irq_domain_xlate(struct irq_domain *d,
|
|
struct device_node *controller,
|
|
const u32 *intspec, unsigned int intsize,
|
|
unsigned long *out_hwirq,
|
|
unsigned int *out_type)
|
|
{
|
|
if (irq_domain_get_of_node(d) != controller)
|
|
return -EINVAL;
|
|
if (intsize == 1 && intspec[0] < 16) {
|
|
*out_hwirq = intspec[0];
|
|
*out_type = IRQ_TYPE_EDGE_RISING;
|
|
return 0;
|
|
}
|
|
if (intsize < 3)
|
|
return -EINVAL;
|
|
|
|
/* Get the interrupt number and add 16 to skip over SGIs */
|
|
*out_hwirq = intspec[1] + 16;
|
|
|
|
/* For SPIs, we need to add 16 more to get the irq ID number */
|
|
if (!intspec[0])
|
|
*out_hwirq += 16;
|
|
|
|
*out_type = intspec[2] & IRQ_TYPE_SENSE_MASK;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int hip04_irq_starting_cpu(unsigned int cpu)
|
|
{
|
|
hip04_irq_cpu_init(&hip04_data);
|
|
return 0;
|
|
}
|
|
|
|
static const struct irq_domain_ops hip04_irq_domain_ops = {
|
|
.map = hip04_irq_domain_map,
|
|
.xlate = hip04_irq_domain_xlate,
|
|
};
|
|
|
|
static int __init
|
|
hip04_of_init(struct device_node *node, struct device_node *parent)
|
|
{
|
|
int nr_irqs, irq_base, i;
|
|
|
|
if (WARN_ON(!node))
|
|
return -ENODEV;
|
|
|
|
hip04_data.dist_base = of_iomap(node, 0);
|
|
WARN(!hip04_data.dist_base, "fail to map hip04 intc dist registers\n");
|
|
|
|
hip04_data.cpu_base = of_iomap(node, 1);
|
|
WARN(!hip04_data.cpu_base, "unable to map hip04 intc cpu registers\n");
|
|
|
|
/*
|
|
* Initialize the CPU interface map to all CPUs.
|
|
* It will be refined as each CPU probes its ID.
|
|
*/
|
|
for (i = 0; i < NR_HIP04_CPU_IF; i++)
|
|
hip04_cpu_map[i] = 0xffff;
|
|
|
|
/*
|
|
* Find out how many interrupts are supported.
|
|
* The HIP04 INTC only supports up to 510 interrupt sources.
|
|
*/
|
|
nr_irqs = readl_relaxed(hip04_data.dist_base + GIC_DIST_CTR) & 0x1f;
|
|
nr_irqs = (nr_irqs + 1) * 32;
|
|
if (nr_irqs > HIP04_MAX_IRQS)
|
|
nr_irqs = HIP04_MAX_IRQS;
|
|
hip04_data.nr_irqs = nr_irqs;
|
|
|
|
irq_base = irq_alloc_descs(-1, 0, nr_irqs, numa_node_id());
|
|
if (irq_base < 0) {
|
|
pr_err("failed to allocate IRQ numbers\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
hip04_data.domain = irq_domain_add_legacy(node, nr_irqs, irq_base,
|
|
0,
|
|
&hip04_irq_domain_ops,
|
|
&hip04_data);
|
|
if (WARN_ON(!hip04_data.domain))
|
|
return -EINVAL;
|
|
|
|
#ifdef CONFIG_SMP
|
|
set_smp_ipi_range(irq_base, 16);
|
|
#endif
|
|
set_handle_irq(hip04_handle_irq);
|
|
|
|
hip04_irq_dist_init(&hip04_data);
|
|
cpuhp_setup_state(CPUHP_AP_IRQ_HIP04_STARTING, "irqchip/hip04:starting",
|
|
hip04_irq_starting_cpu, NULL);
|
|
return 0;
|
|
}
|
|
IRQCHIP_DECLARE(hip04_intc, "hisilicon,hip04-intc", hip04_of_init);
|